CN110357187B

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Info

Publication number: CN110357187B
Application number: CN201910575845.6A
Authority: CN
Inventors: 陈志华; 李晓辉; 陈庆华; 任坤坤
Original assignee: PowerChina Hebei Engineering Corp Ltd
Current assignee: PowerChina Hebei Engineering Corp Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2021-11-09
Anticipated expiration: 2039-06-28
Also published as: CN110357187A

Abstract

The invention discloses a pairing method of circular low-temperature multi-effect seawater desalination evaporators, which comprises the following steps of 1: an adjustable support rod with the length matched with the diameter of the first circular evaporator is selected to be fixedly connected between the fixed support rod and the telescopic part; step 2: the lower semicircle of the first circular evaporator is welded with the lower semicircle of the second circular evaporator; and step 3: the upper semicircle of the first circular evaporator is connected with the upper semicircle of the second circular evaporator in a welding way. The invention can uniformly disperse the welding stress on the evaporator and ensure the welding quality. The invention is suitable for a circular evaporator and is used for assembly welding.

Description

Assembly method of circular low-temperature multi-effect seawater desalination evaporators

Technical Field

The invention belongs to the technical field of equipment assembly, and relates to pairing installation of a seawater desalination multi-effect evaporator, in particular to a pairing method of a circular low-temperature multi-effect seawater desalination evaporator.

Background

Water is a source of life and an artery for social and economic development. Although 70% of the area on earth is covered by water, people rely on fresh water to live accounting for 2.5% to 3% of the total water. In view of 70% of human living in the place less than 120 km away from the sea, vast sea is used as a source for obtaining fresh water, and desalinated seawater is used as a powerful supplementary measure of the existing water source and can meet the domestic water demand of people under certain conditions. The existing seawater desalination distillation method mainly comprises two methods, namely low-temperature multi-effect distillation and multi-stage flash distillation. The low-temperature multi-effect distillation is a seawater desalination process which utilizes steam to condense in a condensing tube so that seawater is gradually and multi-effect evaporated outside the condensing tube to obtain fresh water. The low-temperature multi-effect distillation seawater desalination can use low-pressure steam extraction of a power plant as a heating source to form a seawater desalination mode of water and electricity cogeneration, so that the seawater desalination mode is paid attention by all parties.

The low-temperature multi-effect seawater desalination evaporator is formed by connecting a plurality of evaporators in series, a square evaporator of large-scale seawater desalination equipment (more than 3000 t/d) is large in size, the material of the square evaporator is mostly super duplex stainless steel, the assembly and welding technical requirement is high, the assembly and welding difficulty is high, the square evaporator belongs to ultrathin (8-10 mm) ultra-large heat exchange equipment, in order to ensure accurate connection of all evaporators during final assembly of the low-temperature multi-effect seawater desalination evaporator, the assembly and welding quality of all evaporators must be controlled, particularly, the roundness of a single-effect circular evaporator and the flatness of the single-effect square evaporator are adjusted, and the precision requirement of the whole equipment during final assembly is ensured.

When present circular evaporator of sea water desalination's circularity, often adopt the inside of many spinal branchs vaulting pole that length is the same to push up the evaporimeter simultaneously in order to adjust the circularity of evaporimeter, have following defect during the use: firstly, the length of the supporting rod cannot be changed according to the diameter of the evaporator, so that the supporting rod can only be used for adjusting a circular evaporator with a single model; secondly, because the wall thickness of the evaporator is thin, when the roundness of the circular evaporator is adjusted by adopting the method, the local part of the evaporator equipment is easily over concentrated, and the welding quality of the welding seam of the evaporator is influenced.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a pairing method of a circular low-temperature multi-effect seawater desalination evaporator so as to achieve the purposes of uniformly dispersing welding stress on the evaporator and ensuring the welding quality.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a pairing method of circular low-temperature multi-effect seawater desalination evaporators is characterized in that the roundness of a first circular evaporator is adjusted by a low-temperature multi-effect seawater desalination evaporator group pairing device;

the low-temperature multi-effect seawater desalination evaporator set pair device comprises a fixed supporting rod, an adjustable supporting rod and a telescopic part which are sequentially arranged; the adjustable support rod is detachably connected between the fixed support rod and the telescopic part, and the telescopic part can stretch along the axial direction of the adjustable support rod; the openings of the fixed support rod and the adjustable support rod are fixedly connected with blocking plates, and the fixed support rod and the telescopic part are respectively fixed with backing plates which are contacted with the inner wall of the evaporator;

the pairing method of the circular low-temperature multi-effect seawater desalination evaporators comprises the following steps:

step 1: an adjustable support rod with the length matched with the diameter of the first circular evaporator is selected to be fixedly connected between the fixed support rod and the telescopic part;

step 2: the lower semicircle of the first circular evaporator is connected with the lower semicircle of the second circular evaporator by welding

The step (1): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the diameter of the first circular evaporator, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, the second circular evaporator is provided with a circular diameter corresponding to the diameter of the first circular evaporator, and when the end point of the first circular evaporator located on the lower semicircle is level with the end point of the second semicircle located on the circular diameter, the two level end points are welded and connected;

step (2): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the first circular evaporator with different diameters, and repeatedly performing jacking and welding operations in the step (1);

and step 3: the upper semicircle of the first circular evaporator is welded with the upper semicircle of the second circular evaporator

The step (1): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the diameter of the first circular evaporator, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, the second circular evaporator is provided with a circular diameter corresponding to the diameter of the first circular evaporator, and when the end point of the first circular evaporator, which is positioned on the upper semicircle, is level with the end point of the second circular evaporator, the two level end points are welded and connected;

step (2): and (3) shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on different diameters of the first circular evaporator, and repeatedly performing jacking and welding operation in the step (1).

As a limitation of the present invention, step 2: the lower semicircle of the first circular evaporator is connected with the lower semicircle of the second circular evaporator by welding

The step (1): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the diameter of the first circular evaporator, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, the second circular evaporator is provided with a first circular diameter corresponding to the first diameter of the first circular evaporator, and when the first diameter of the first circular evaporator is located at the end point of the lower semicircle and the end point of the lower semicircle located at the first circular diameter are level, the two level end points are welded and connected;

step (2): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the Q-th diameter of the first circular evaporator, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, the second circular evaporator is provided with a Q-th circular diameter corresponding to the Q-th diameter of the first circular evaporator, and when the Q-th diameter of the first circular evaporator is located at the end point of the lower semicircle and the end point of the lower semicircle located at the Q-th circular diameter and is level, the two level end points are welded and connected;

step (3): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the Mth diameter of the first circular evaporator, enabling the first diameter to be a symmetric center line of the Qth diameter and the Mth diameter, extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, enabling the second circular evaporator to be provided with the Mth circular diameter corresponding to the Mth diameter of the first circular evaporator, and welding and connecting the end points of the two parallel and level ends when the Mth diameter of the first circular evaporator is located at the end point of the lower semicircle and the end point of the lower semicircle located at the Mth circular diameter is parallel and level; wherein Q is more than 1, and M is more than 1;

step (4): taking different values of Q and M, selecting different diameters on the first circular evaporator and different circular diameter positions on the second circular evaporator, and repeatedly performing jacking and welding operations in the steps (2) and (3);

The step (1): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the X-th diameter of the first circular evaporator, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, the second circular evaporator is provided with an X-th circular diameter corresponding to the X-th diameter of the first circular evaporator, and when the X-th diameter of the first circular evaporator is located at the end point of the upper semicircle and the end point of the upper semicircle located at the X-th circular diameter, the two parallel and level end points are welded and connected;

step (2): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the Kth diameter of the first circular evaporator, enabling the first diameter to be a symmetrical center line of the Xth diameter and the Kth diameter, extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, enabling the second circular evaporator to be provided with the Kth circular diameter corresponding to the Kth diameter of the first circular evaporator, and welding and connecting two parallel and level end points when the Kth diameter of the first circular evaporator is located at the end point of the upper semicircle and the end point of the upper semicircle located at the Kth circular diameter are parallel and level; wherein X is more than 1, and K is more than 1;

step (3): and (3) taking different values of X, K, selecting different diameters on the first circular evaporator and different diameter positions of the circle on the second circular evaporator, and repeating the jacking and welding operations in the steps (2) and (3).

As a further limitation of the present invention, the step (4) in the step 2: taking different values of Q, sequentially placing the low-temperature multi-effect seawater desalination evaporator assembly devices on different diameters of the first circular evaporator in the anticlockwise or clockwise direction, and repeatedly performing jacking and welding operations in the step (2) and the step (3);

the step (3) in the step 3: and (3) taking different values of X, sequentially placing the low-temperature multi-effect seawater desalination evaporator assembly devices on different diameters of the first circular evaporator in the anticlockwise or clockwise direction, and repeatedly performing jacking and welding operations in the step (1) and the step (2).

As another limitation of the present invention, instep 2, the (4) th step: taking different values of Q and M to ensure that the minimum included angles between the boundary of the upper semicircle and the lower semicircle and the diameter Q are less than or equal to alpha, and repeating the jacking and welding operations in the steps (2) and (3);

the step (3) in the step 3: and (3) taking X, K different values to ensure that the minimum included angles of the X-th diameter and the first diameter are less than or equal to beta, and repeating the jacking and welding operations in the step (1) and the step (2), wherein alpha belongs to (0 degrees, 90 degrees) and beta belongs to (0 degrees, 90 degrees).

As a further limitation of the present invention, step 0: marking the periphery of a circular evaporator

The step (1): marking points A (0), … …, A (n-1), A (n), B (0), … …, B (n-1) and B (n) are uniformly and clockwise spaced along the periphery of the first circular evaporator, and a connecting line of the A (0) and the B (0), … …, a connecting line of the A (n-1) and the B (n-1) and a connecting line of the A (n) and the B (n) are all the diameters of the first circular evaporator, wherein n is more than or equal to 2;

step (2): the marks are sequentially and uniformly marked along the periphery of the second circular evaporator at intervals clockwise, and are arranged on the first circular evaporator in a one-to-one correspondence manner, namely a (0), … …, A (n-1), A (n), B (0), … …, B (n-1) and B (n), a (0), … …, a (n-1), a (n), B (0), … …, B (n-1) and B (n).

step (2): a (0), a (1), a (2), a (3), a (4), a (5), B (6), B (7), A (8), A (9), B (0), B (1), B (2), B (3), B (4), B (5), B (6), B (7), B (8) and B (9) which are arranged in one-to-one correspondence along the periphery of the second circular evaporator are sequentially and uniformly marked at intervals with a (0), a (1), a (2), a (3), a (4), a (5), a (6), a (7), a (8), a (9), B (0), B (1), B (2), B (3), B (4), B (5), B (6), B (7), B (8) and B (9) on the first circular evaporator;

The step (1): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of A (0) and B (0), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (0) with the point B (0) when the point B (0) is level with the point B (0);

step (2): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (1) and the B (1), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (1) with the point B (1) when the point B (1) is level with the point B (1);

step (3): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (9) and the B (9), extending the telescopic part to enable the backing plate of the fixed supporting rod and the backing plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (9) with the point a (9) when the positions of the point A (9) and the point a (9) are parallel and level;

step (4): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (2) and the B (2), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (2) with the point B (2) when the positions of the point B (2) and the point B (2) are parallel and level;

step (5): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (8) and the B (8), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (8) with the point a (8) when the positions of the point A (8) and the point a (8) are parallel and level;

step (6): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (3) and the B (3), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (3) with the point B (3) when the positions of the point B (3) and the point B (3) are parallel and level;

step (7): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (7) and the B (7), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (7) with the point a (7) when the positions of the point A (7) and the point a (7) are parallel and level;

step (8): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of A (4) and B (4), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (4) with the point B (4) when the positions of the point B (4) and the point B (4) are parallel and level;

step (9): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (6) and the B (6), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (6) with the point a (6) when the positions of the point A (6) and the point a (6) are parallel and level;

step (10): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (5) and the B (5), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (5) with the point B (5) when the positions of the point B (5) and the point B (5) are parallel and level;

The step (1): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (5) and the B (5), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (5) with the point a (5) when the positions of the point A (5) and the point a (5) are parallel and level;

step (2): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (6) and the B (6), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (6) with the point B (6) when the positions of the point B (6) and the point B (6) are parallel and level;

step (3): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (4) and the B (4), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (4) with the point a (4) when the positions of the point A (4) and the point a (4) are parallel and level;

step (4): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (7) and the B (7), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (7) with the point B (7) when the positions of the point B (7) and the point B (7) are parallel and level;

step (5): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (3) and the B (3), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (3) with the point a (3) when the positions of the point A (3) and the point a (3) are parallel and level;

step (6): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of A (8) and B (8), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and when the point B (8) is parallel and level with the position of the point B (8) and the position of the point B (8) is parallel and level with the position of the point B (8), welding and connecting the point B (8) with the point B (8) and welding and connecting the point B (8) with the point B (8);

step (7): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (2) and the B (2), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (2) with the point a (2) when the positions of the point A (2) and the point a (2) are parallel and level;

step (8): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of A (9) and B (9), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point B (9) with the point B (9) when the positions of the point B (9) and the point B (9) are parallel and level;

step (9): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of the A (1) and the B (1), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (1) with the point a (1) when the positions of the point A (1) and the point a (1) are parallel and level;

step (10): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on a connecting line of A (0) and B (0), extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, and welding and connecting the point A (0) with the point a (0) when the point A (0) is parallel and level with the point a (0).

As another limitation of the invention, in bothstep 1 andstep 2, the low-temperature multi-effect seawater desalination evaporator pairing device is fixed on the inverted chain through the single-hole hanging plate, so that the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the circle center.

As a further limitation of the invention, the telescopic part is a jack.

Due to the adoption of the technical scheme, compared with the prior art, the low-temperature multi-effect seawater desalination evaporator set pair device has the beneficial effects that:

(1) the adjustable support rods with adaptive lengths can be selected according to the diameter of the first circular evaporator, so that the low-temperature multi-effect seawater desalination evaporator pairing device can be tightly propped in the first circular evaporator;

(2) according to the invention, the low-temperature multi-effect seawater desalination evaporator pairing device is placed at different positions in the first circular evaporator, so that two points on the circumference of the first circular evaporator, where different diameters are located, can be respectively welded and connected with corresponding two points on the circumference of the second circular evaporator; therefore, the roundness of the first circular evaporator can be adjusted, so that the first circular evaporator meets the roundness requirement of assembly with the second evaporator, and compared with the prior art that the roundness of a plurality of positions is corrected simultaneously by adopting the multipoint correction mode, the invention can effectively evenly disperse the welding stress on the circumference of the circular evaporator, avoid the situations of overlarge local stress and large stress residue of the circular evaporator and ensure the welding quality;

(3) according to the invention, the lower semicircle is welded firstly, and then the upper semicircle is welded, so that the stress can be effectively released, the deformation of the circular evaporator is adapted, and the welding stress is averagely dispersed on the circular evaporator;

(4) according to the invention, the low-temperature multi-effect seawater desalination evaporator assembly device is successively placed on the two symmetrical diameters of the first diameter on the first circular evaporator, so that the welding stress can be averaged on the circular evaporator, and the local stress condition at the welding point is improved;

(5) according to the invention, by marking the periphery of the circular evaporator, the placing position of the low-temperature multi-effect seawater desalination evaporator group assembly device is easily and accurately and quickly selected during use, and the levelness of the corresponding welding points of the first circular evaporator and the second circular evaporator is also easily observed so as to ensure the welding quality;

in conclusion, the invention has the advantages of convenient operation, high welding efficiency, successful assembly in one time and good welding quality.

The invention is suitable for a circular evaporator and is used for assembly welding.

Drawings

The invention is described in further detail below with reference to the figures and the embodiments.

FIG. 1 is a schematic structural view of example 1 of the present invention;

fig. 2 is a schematic structural relationship diagram of theadjustable support rod 2 and the telescopic part inembodiment 1 of the present invention;

fig. 3 is a schematic structural relationship diagram of the blockingplate 6 and thebacking plate 5 on the fixedsupport rod 1 according toembodiment 1 of the present invention;

FIG. 4 is a schematic diagram showing the positional relationship of the outer peripheral mark points of a second circular evaporator inembodiment 2 of the present invention;

fig. 5 (1) is a schematic structural diagram of a low-temperature multi-effect seawater desalination evaporator unit assembly device inembodiment 2 of the present invention, which is disposed on a connection line between a (0) and B (0); (2) is a structural schematic diagram of a low-temperature multi-effect seawater desalination evaporator assembly device arranged on a connecting line of A (1) and B (1) inembodiment 2 of the invention; (3) is a structural schematic diagram of a low-temperature multi-effect seawater desalination evaporator assembly device arranged on a connecting line of A (9) and B (9) inembodiment 2 of the invention;

fig. 6 (4) is a schematic structural diagram of a low-temperature multi-effect seawater desalination evaporator unit assembly device arranged on a connecting line between a (2) and a (2) inembodiment 2 of the present invention; (5) is a structural schematic diagram of a low-temperature multi-effect seawater desalination evaporator assembly device arranged on a connecting line of A (8) and B (8) inembodiment 2 of the invention;

fig. 7 (6) is a schematic structural diagram of a low-temperature multi-effect seawater desalination evaporator unit assembly device arranged on a connecting line between a (3) and a (3) inembodiment 2 of the present invention; (7) is a structural schematic diagram of a low-temperature multi-effect seawater desalination evaporator assembly device arranged on a connecting line of A (7) and B (7) inembodiment 2 of the invention;

fig. 8 (8) is a schematic structural diagram of a low-temperature multi-effect seawater desalination evaporator unit assembly device inembodiment 2 of the present invention, which is disposed on a connection line between a (4) and B (4); (9) is a structural schematic diagram of a low-temperature multi-effect seawater desalination evaporator assembly device arranged on a connecting line of A (6) and B (6) inembodiment 2 of the invention; (10) the structural schematic diagram of the low-temperature multi-effect seawater desalination evaporator assembly device of theembodiment 2 of the invention is arranged on the connecting line of A (5) and B (5).

In the figure: 1. fixing the support rod; 2. an adjustable support rod; 3. a jack; 4. a single-hole hanger plate; 5. a base plate; 6. a blocking plate; 7. and (4) a flange.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description of the preferred embodiment is only for purposes of illustration and understanding, and is not intended to limit the invention.

Embodiment 1 a low-temperature multi-effect seawater desalination evaporator assembly device

In this embodiment, the expansion part is expanded along the axial direction of theadjustable support rod 2, so that the expansion part and the fixedsupport rod 1 exert force on the evaporator to adjust the roundness of the circular evaporator or the flatness of the square evaporator. As shown in fig. 1, the present embodiment includes a fixedsupport rod 1, anadjustable support rod 2 and a telescopic portion, which are sequentially arranged from left to right.

One, expansion part

The telescopic part is used for adjusting the telescopic length of the low-temperature multi-effect seawater desalination evaporator assembly device. The telescopic part can be telescopic along the axial direction of the adjustable supportingrod 2. The telescopic part can adopt an air cylinder, an electric cylinder and a hydraulic cylinder. In this embodiment, the telescopic part is ajack 3. The top plate of thejack 3 is fixedly connected with theadjustable support rod 2, and the base plate of thejack 3 is fixedly connected with abacking plate 5 and is in direct contact with the inner wall of the evaporator through thebacking plate 5. In order to avoid polluting the surface of the evaporator with duplex stainless steel in the using process, the handle of thejack 3 and thebacking plate 5 on thejack 3 are made of stainless steel.

Two, adjustable supportingrod 2

The adjustable supportingrod 2 can be selected to have different lengths according to the size of the evaporator. Theadjustable support rod 2 is made of a carbon steel pipe, and flange blocking plates are fixedly connected to openings at two ends of theadjustable support rod 2. The one end ofadjustable support bar 2 can be dismantled and be connected with fixedsupport bar 1, and the other end ofadjustable support bar 2 can be dismantled and be connected with the pars contractilis, and the axis collineation ofadjustable support bar 2 and fixedsupport bar 1. About detachable mode be manifold, like threaded connection, joint, cooperation connection etc. adopt the flange mode in this embodiment,adjustable support rod 2 can dismantle with fixedsupport rod 1 throughflange 7 and be connected, andadjustable support rod 2 can dismantle throughflange 7 with the pars contractilis and be connected.

In order to avoid polluting the duplex stainless steel material on the surface of the evaporator in the using process, the outer circumferential surface of theadjustable support rod 2 is coated with a plastic pipe.

Thirdly, fixing the supportingrod 1

The fixed supportingrod 1 is used for conducting force. The fixedsupport rod 1 is made of a carbon steel pipe. One end of the fixedsupport rod 1 is detachably connected with theadjustable support rod 2, and the other end opening of the fixedsupport rod 1 is fixedly connected with a blockingplate 5 so as to block the end opening of the carbon steel pipe through the blockingplate 5. The blockingplate 5 is connected with abacking plate 6 through a screw, so that thebacking plate 6 is directly contacted with the inner wall of the evaporator. In order to avoid polluting the duplex stainless steel material on the surface of the evaporator, the outer peripheral surface of the fixed supportingrod 1 is coated with a plastic pipe, and thebacking plate 5 is made of stainless steel material.

The fixedsupport rod 1 is fixedly connected with a single-hole hanging plate 4, and the distance from the single-hole hanging plate 4 to anupper backing plate 5 of the fixedsupport rod 1 is equal to the distance from the single-hole hanging plate 4 to theupper backing plate 5 of the telescopic part. Therefore, the single-hole hanging plate 4 can be fixed on the inverted chain, and the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the evaporator to change the position of the low-temperature multi-effect seawater desalination evaporator pairing device on the evaporator.

Embodiment 2 pairing method of circular low-temperature multi-effect seawater desalination evaporators

The roundness of the first circular evaporator is adjusted by using the low-temperature multi-effect seawater desalination evaporator set pair device in theembodiment 1. The pairing method of the circular low-temperature multi-effect seawater desalination evaporators comprises the following steps:

step 1: theadjustable support rod 2 with the length matched with the diameter of the first circular evaporator is selected to be fixedly connected between the fixedsupport rod 1 and the telescopic part, namely theadjustable support rod 2 is fixedly connected between the fixedsupport rod 1 and thejack 3 through theflange 4.

The step (1): the telescopic part is shortened, so that the extension length of the low-temperature multi-effect seawater desalination evaporator pairing device is smaller than the first diameter of the first circular evaporator, and the low-temperature multi-effect seawater desalination evaporator pairing device is placed on the first diameter of the first circular evaporator, namely the axis of the fixedsupport rod 1, the axis of theadjustable support rod 2 and the extension direction of thejack 3 are collinear with the first diameter of the first circular evaporator.

The extension telescopic part enables thebacking plate 5 of the fixedsupport rod 1 and thebacking plate 5 of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator, and the second circular evaporator is provided with a circular diameter corresponding to the diameter of the first circular evaporator, namely, the group to be assembled and the welding point is respectively positioned on the first circular diameter and the first diameter. Observing two points of the first diameter of the low-temperature multi-effect seawater desalination evaporator group pair device, which are positioned on the lower semicircle of the first circular evaporator, and welding the two parallel end points when the first diameter of the first circular evaporator is positioned on the end point of the lower semicircle and the end point of the lower semicircle positioned on the first circle diameter are parallel and level, namely when the requirements of assembly and welding are met. Referring to (1) of fig. 5, the first diameter is a (0) B (0), and the first circle diameter is a (0) B (0) of fig. 4, and when the point B (0) is flush with the point B (0), the point B (0) is weld-connected to the point B (0).

Step (2): the telescopic part is shortened to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the Q-th diameter of the first circular evaporator, and the telescopic part is extended to enable thebacking plate 5 of the fixed supporting rod and thebacking plate 5 of the telescopic part to be tightly propped against the inner wall of the first circular evaporator. Have the Q circle diameter corresponding with first circular evaporator Q circle diameter on the second circular evaporator, first circular evaporator Q circle diameter is located the extreme point of semicircle down and is located the Q circle diameter under when semicircle extreme point parallel and level, links to each other two parallel and level extreme points welding.

Step (3): shorten the pars contractilis and make low temperature multiple-effect seawater desalination evaporator group to put on the Mth diameter of first circular evaporator to the device, first diameter is the symmetric center line of Q th diameter and Mth diameter, and extension pars contractilis makesbacking plate 5 of fixedstay bar 1 and thebacking plate 5 top of pars contractilis tightly on the inner wall of first circular evaporator. The second circular evaporator is provided with an Mth circular diameter corresponding to the Mth diameter of the first circular evaporator, and when the Mth diameter of the first circular evaporator is positioned at the end point of the lower semicircle and the end point of the lower semicircle positioned at the Mth circular diameter are level, the two level end points are welded and connected; wherein Q is more than 1, and M is more than 1.

Step (4): and when different values of Q are taken, the low-temperature multi-effect seawater desalination evaporator group pair devices are sequentially placed on the first circular evaporators in different diameters in the anticlockwise or clockwise direction. In order to better release welding stress, a minimum included angle between a boundary of the upper semicircle and the lower semicircle and the first diameter is alpha, when Q and M are different, the minimum included angle between the boundary of the upper semicircle and the lower semicircle and the diameter Q is less than or equal to alpha, and the jacking and welding operations in the steps (2) and (3) are repeated. In the embodiment, a dividing line between the upper semicircle and the lower semicircle is a horizontal line, and the first diameter is located on a vertical line perpendicular to the horizontal line.

The step (1): shorten the pars contractilis and make low temperature multiple-effect seawater desalination evaporator group to put on the X diameter of first circular evaporator to the device, the extension pars contractilis makes the backing plate of fixed stay pole and the backing plate top of pars contractilis tight on the inner wall of first circular evaporator, have on the second circular evaporator with the corresponding X circle diameter of first circular evaporator X diameter, first circular evaporator X diameter is located the extreme point of semicircle and is located X circle diameter upper half circle extreme point parallel and level, link to each other two parallel and level extreme point welding.

Step (2): shortening the telescopic part to enable the low-temperature multi-effect seawater desalination evaporator assembly device to be placed on the Kth diameter of the first circular evaporator, enabling the first diameter to be a symmetrical center line of the Xth diameter and the Kth diameter, extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator, enabling the second circular evaporator to be provided with the Kth circular diameter corresponding to the Kth diameter of the first circular evaporator, and welding and connecting two parallel and level end points when the Kth diameter of the first circular evaporator is located at the end point of the upper semicircle and the end point of the upper semicircle located at the Kth circular diameter are parallel and level; wherein X is more than 1, and K is more than 1.

Step (3): and taking different values of X, and sequentially placing the low-temperature multi-effect seawater desalination evaporator pair devices on different diameters of the first circular evaporator in the anticlockwise or clockwise direction. In order to better release welding stress, a minimum included angle between the X-th diameter and the first diameter is beta, different values of X, K are taken, so that the minimum included angles between the X-th diameter and the first diameter are smaller than or equal to beta, and the jacking and welding operations in the steps (1) and (2) are repeated, wherein beta belongs to (0 DEG, 90 DEG).

Embodiment 3 pairing method of circular low-temperature multi-effect seawater desalination evaporators

In this embodiment, the roundness of the first circular evaporator is adjusted by using the pair of low-temperature multi-effect seawater desalination evaporator sets inembodiment 1. For convenience of use and quick operation, the embodiment is further embodied on the basis of embodiment 2:

step 0: marking the periphery of the circular evaporator (as a preparatory step)

The step (1): marking points A (0), … …, A (n-1), A (n), B (0), … …, B (n-1) and B (n) are evenly spaced clockwise along the periphery of the first circular evaporator, and a connecting line of the A (0) and the B (0), … …, a connecting line of the A (n-1) and the B (n-1) and a connecting line of the A (n) and the B (n) are all the diameter of the first circular evaporator, wherein n is larger than or equal to 2.

The connecting line of A (0) and B (0) is positioned on the vertical line, and the connecting line of A (5) and B (5) is positioned on the boundary line of the upper semicircle and the lower semicircle. Then A (6), A (7), A (8), A (9), B (0), B (1), B (2), B (3), B (4), B (5) are located on the lower semicircle, and the remaining points are on the upper semicircle. Reference is made to the marked points shown on the first circular evaporator in fig. 5 to 8.

A (0), a (1), a (2), a (3), a (4), a (5), B (6), B (7), B (8), A (9), B (0), B (1), B (2), B (3), B (4), B (5), B (6), B (7), B (8) and B (9) which are arranged in one-to-one correspondence along the periphery of the second circular evaporator are sequentially and evenly marked at intervals with a (0), a (1), a (2), a (3), a (4), a (5), a (6), a (7), a (8), a (9), B (0), B (1), B (2), B (3), B (4), B (5), B (6), B (7), B (8) and B (9) on the first circular evaporator, the connecting line of a (0) and b (0) is located on the vertical line, and the connecting line of a (5) and b (5) is located on the boundary line of the upper semicircle and the lower semicircle. Reference is made to the marked points shown on the second circular evaporator in fig. 4.

Step 1: theadjustable support rod 2 with the length matched with the diameter of the first circular evaporator is selected to be fixedly connected between the fixedsupport rod 1 and thejack 3, wherein the matching means that the diameter of the first circular evaporator is between the limit length of the low-temperature multi-effect seawater desalination evaporator group device when thejack 3 extends and the limit length of thejack 3 when thejack 3 shortens.

The step (1): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (0) and B (0), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 1 to be tightly propped against the inner wall of the first circular evaporator as shown in (1) in a reference figure 5. Two circular evaporators were observed, and when point B (0) was flush with point B (0), point B (0) was weld-joined to point B (0).

Step (2): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (1) and B (1), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (2) in a reference figure 5. Two circular evaporators were observed, and when point B (1) was flush with point B (1), point B (1) was welded to point B (1).

Step (3): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (9) and B (9), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (3) in a reference figure 5. Looking at both circular evaporators, when point a (9) is level with point a (9), point a (9) is welded to point a (9).

Step (4): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (2) and B (2), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (4) in figure 6. And (5) observing the two circular evaporators, and connecting the point B (2) with the point B (2) in a welding mode when the point B (2) is level with the point B (2).

Step (5): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (8) and B (8), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (5) in a reference figure 6. Looking at the two circular evaporators, when point a (8) is level with point a (8), point a (8) is welded to point a (8).

Step (6): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (3) and B (3), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (6) in a figure 7. And (5) observing the two circular evaporators, and connecting the point B (3) with the point B (3) in a welding mode when the positions of the point B (3) and the point B (3) are level.

Step (7): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (7) and B (7), and extending thejack 3 to enable thebase plate 5 of the fixed supporting rod and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (7) in a reference figure 7. Looking at both circular evaporators, when point a (7) is level with point a (7), point a (7) is welded to point a (7).

Step (8): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (4) and B (4), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 2 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (8) in a reference figure 8. And observing the two circular evaporators, and connecting the point B (4) with the point B (4) in a welding mode when the point B (4) is level with the point B (4).

Step (9): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (6) and B (6), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (9) of figure 8. Looking at both circular evaporators, when point a (6) is level with point a (6), point a (6) is welded to point a (6).

Step (10): shortening thejack 3, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of A (5) and B (5), and extending thejack 3 to enable thebase plate 5 of the fixed supportingrod 1 and thebase plate 5 of thejack 3 to be tightly propped against the inner wall of the first circular evaporator as shown in (10) of figure 8. And observing the two circular evaporators, and connecting the point B (5) with the point B (5) in a welding mode when the point B (5) is level with the point B (5).

The step (1): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on the connecting line of the A (5) and the B (5), and referring to (10) in fig. 8, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point A (5) is level with the point a (5), welding and connecting the point A (5) with the point a (5).

Step (2): and (3) shortening the jack, enabling the low-temperature multi-effect seawater desalination evaporator pairing device to rotate around the circumferential center of the first circular evaporator, placing the low-temperature multi-effect seawater desalination evaporator pairing device on a connecting line of the A (6) and the B (6), and extending the telescopic part to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly propped against the inner wall of the first circular evaporator as shown in (9) in fig. 8. when the point B (6) is level with the point B (6), the point B (6) is connected with the point B (6) in a welding mode.

Step (3): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on a connecting line of A (4) and B (4), and referring to (8) in fig. 8, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point A (4) is level with the point a (4), welding and connecting the point A (4) with the point a (4).

Step (4): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on a connecting line of A (7) and B (7), and referring to (7) in fig. 7, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point B (7) is level with the point B (7), welding and connecting the point B (7) with the point B (7).

Step (5): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on the connecting line of the A (3) and the B (3), and referring to (6) in fig. 7, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point A (3) is level with the point a (3), welding and connecting the point A (3) with the point a (3).

Step (6): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on a connecting line of A (8) and B (8), and referring to (5) in fig. 6, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point B (8) is level with the position of the point B (8) and the point B (8) is level with the position of the point B (8), the point B (8) is connected with the point B (8) in a welding way, and the point B (8) is connected with the point B (8) in a welding way.

Step (7): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on a connecting line of the A (2) and the B (2), and referring to (4) in fig. 6, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point A (2) is level with the point a (2), welding and connecting the point A (2) with the point a (2).

Step (8): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on a connecting line of A (9) and B (9), and referring to (3) in fig. 5, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point B (9) is level with the point B (9), welding and connecting the point B (9) with the point B (9).

Step (9): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on the connecting line of the A (1) and the B (1), and referring to (2) in fig. 5, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. And when the point A (1) is level with the point a (1), welding and connecting the point A (1) with the point a (1).

Step (10): thejack 3 is shortened, the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the center of the circumference of the first circular evaporator, the low-temperature multi-effect seawater desalination evaporator pairing device is placed on the connecting line of A (0) and B (0), and referring to (1) in fig. 5, the telescopic part is extended to enable the base plate of the fixed supporting rod and the base plate of the telescopic part to be tightly pressed against the inner wall of the first circular evaporator. When the point A (0) is level with the point a (0), the point A (0) is connected with the point a (0) in a welding mode.

After spot welding of the two circular evaporators is completed, the remaining part between the two circular evaporators can be welded.

Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pairing method of circular low-temperature multi-effect seawater desalination evaporators is characterized by comprising the following steps: the roundness of the first circular evaporator is adjusted by using the low-temperature multi-effect seawater desalination evaporator set pair device;

step (4): taking different values of Q, selecting different diameters on the first circular evaporator and different diameter positions on the second circular evaporator, and repeatedly performing jacking and welding operations in the steps (2) and (3);

step (3): and (3) taking different values of X, selecting different diameters on the first circular evaporator and different diameter positions of the second circular evaporator, and repeatedly performing jacking and welding operations in the steps (2) and (3).

2. The pairing method of the circular low-temperature multi-effect seawater desalination evaporator as claimed in claim 1, characterized in that:

the step (4) in the step 2: taking different values of Q and M, sequentially placing the low-temperature multi-effect seawater desalination evaporator assembly devices on the first circular evaporators in different diameters in the anticlockwise or clockwise direction, and repeatedly performing jacking and welding operations in the step (2) and the step (3);

the step (3) in the step 3: and (3) taking different values of X, K, sequentially placing the low-temperature multi-effect seawater desalination evaporator assembly devices on the first circular evaporators with different diameters in the anticlockwise or clockwise direction, and repeatedly performing jacking and welding operations in the step (1) and the step (2).

3. The pairing method of the circular low-temperature multi-effect seawater desalination evaporators as claimed in claim 1 or 2, wherein:

the step (4) in the step 2: taking different values of Q and M to ensure that the minimum included angles between the boundary of the upper semicircle and the lower semicircle and the diameter Q are less than or equal to alpha, and repeating the jacking and welding operations in the steps (2) and (3);

4. The pairing method of the circular low-temperature multi-effect seawater desalination evaporator as claimed in claim 3, characterized in that: a boundary line between the upper semicircle and the lower semicircle is a horizontal line, and the first diameter is positioned on a vertical line perpendicular to the horizontal line.

5. The pairing method of the circular low-temperature multi-effect seawater desalination evaporator as claimed in claim 3, characterized in that:

step 0: marking the periphery of a circular evaporator

6. The pairing method of the circular low-temperature multi-effect seawater desalination evaporators as claimed in claim 5, wherein:

step 0: marking the periphery of a circular evaporator

7. The pairing method of the circular low-temperature multi-effect seawater desalination evaporators as claimed in any one of claims 1 to 2 and 4 to 6, wherein the pairing method comprises the following steps: in the step 1 and the step 2, the low-temperature multi-effect seawater desalination evaporator pairing device is fixed on the inverted chain through the single-hole hanging plate, so that the low-temperature multi-effect seawater desalination evaporator pairing device rotates around the circle center.

8. The pairing method of the circular low-temperature multi-effect seawater desalination evaporators as claimed in claim 7, wherein: the telescopic part is a jack.