Disclosure of Invention
The invention mainly solves the technical problem of providing a low NOx burner which can utilize oxyhydrogen gas injection and grading air distribution thereof to form smoke circulation in a furnace, improve burnout rate by utilizing catalytic property of the oxyhydrogen gas, reduce carbon black in the smoke, and control combustion flame shape and combustion process of fuel by utilizing the grading air distribution device so as to realize low NOx emission of different fuels.
In order to solve the technical problems, the invention adopts a technical scheme that the low NOx burner comprises an air inlet shell, a fuel spray gun, a burner nozzle, a grading air distribution device, a protective air duct and an oxyhydrogen gas duct,
The air inlet shell comprises an inner cavity, an air inlet, an air outlet and a rear cover;
The burner nozzle is connected with the air outlet;
The grading air distribution device comprises an air regulating device, a primary air flow channel, a secondary air flow channel and a rotary air flow regulating structure, wherein the air regulating device is arranged at an air inlet of the air inlet shell, the primary air flow channel and the secondary air flow channel are positioned in an inner cavity of the air inlet shell and are relatively independent, the air regulating device comprises an air regulating plate, the air regulating plate can rotate and stay at least two limit positions, when the air regulating plate is positioned at the middle position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are simultaneously opened, when the air regulating plate is positioned at the first limit position, the inlet of the secondary air flow channel is closed, the inlet of the primary air flow channel is opened, when the air regulating plate is positioned at the second limit position, the inlet of the primary air flow channel is closed, the inlet of the secondary air flow channel is opened, the rotary air flow regulating structure comprises an air inlet channel, the air inlet channel is communicated with the first air flow channel, the rotary air flow regulating structure is provided with a first state and a second state, and when the rotary air flow regulating structure is positioned at the first state, and when the air regulating structure is positioned at the first limit position, the air inlet channel is formed by the rotary air flow regulating structure;
The fuel spray gun is arranged on the rear cover of the air inlet shell, extends to the burner nozzle through the air inlet channel of the rotary air flow regulating structure, and is provided with an air inlet end outside the air inlet shell, and the nozzle end of the fuel spray gun is connected with the burner nozzle;
the protective air guide pipe is arranged at the rear cover of the air inlet shell and extends to the burner nozzle, and the oxyhydrogen gas guide pipe is sleeved in the protective air guide pipe and extends to the burner nozzle.
In a preferred embodiment of the present invention, the fuel lance includes a centrally located fuel nozzle and an atomizing gas nozzle, the centrally located fuel nozzle and the atomizing gas nozzle being in the form of concentric sleeves and being integral.
In a preferred embodiment of the present invention, the oxyhydrogen pipe includes an oxyhydrogen ring pipe and a plurality of oxyhydrogen straight pipes, the oxyhydrogen port is externally connected to the oxyhydrogen ring pipe in the air intake housing, and the oxyhydrogen straight pipes guide the oxyhydrogen to the nozzle.
In a preferred embodiment of the invention, the nozzle of the protective air conduit and the nozzle of the oxyhydrogen conduit form a combined jet, and the outer side of the burner nozzle forms an annular uniform distribution, the oxyhydrogen nozzle is made into different angles, and the protective air jet is made into a swirl shape.
In a preferred embodiment of the present invention, the position adjustment range of the damper is 0 ° -180 °, the percentage of the primary air flow to the secondary air flow is 5% -95%, and the primary air flow can be converted between the direct current wind, the rotational wind and the direct current rotational flow mixed wind by adjusting the state of the rotating air flow adjusting structure.
In a preferred embodiment of the present invention, a front partition plate and a rear partition plate are disposed in the internal cavity of the air intake housing, the front partition plate is located at the air outlet of the air intake housing, the rear partition plate is located at the air inlet of the air intake housing, and the rear partition plate divides the internal cavity into a first cavity through which the primary air flow passes and a second cavity through which the secondary air flow passes.
In a preferred embodiment of the present invention, the secondary air flow channel comprises a plurality of secondary air flow conduits, wherein the front ends of the secondary air flow conduits are installed on the front partition plate and are communicated with the spray pipe of the burner nozzle, the rear ends of the secondary air flow conduits are installed on the rear partition plate and are communicated with the second cavity through which the secondary air flow passes, the second cavity, the secondary air flow conduits and the spray pipe form the secondary air flow channel, the burner nozzle is provided with secondary air flow nozzles, and the secondary air flow nozzles are spray holes with different angles or spray holes formed by blades with certain angles.
In a preferred embodiment of the present invention, the rotary airflow adjusting structure includes an air duct, a cyclone adjuster and a regulator;
the air duct is positioned at the outlet of the spray pipe;
The cyclone and the cyclone are positioned in the inner cavity, the cyclone comprises a rear sleeve and a cyclone regulating tube, the rear sleeve is arranged at the tail end of the inner cavity, the cyclone regulating tube comprises a slotted section and a sealing section, and the slotted section of the cyclone regulating tube is connected with the rear sleeve in a sleeved mode;
one end of the cyclone is connected with the sealing section of the coil adjusting pipe, and the other end of the cyclone is connected with the air duct;
the regulator is connected with the regulating coil, and the regulator regulates the regulating coil to move back and forth between the rear sleeve and the air duct;
When the cyclone adjusting tube is positioned at the rear end, the cyclone is communicated with the air duct to form a cyclone channel;
when the coil adjusting pipe is positioned at the front end, the coil adjusting pipe is communicated with the air duct to form a straight air channel.
In a preferred embodiment of the present invention, the fuel of the coaxially centered fuel lance is a liquid fuel, a gaseous fuel, a pulverized solid fuel or a mixture of fuels.
In a preferred embodiment of the present invention, the fuel lance further comprises a fuel flow adjustment lever in the passage of the centrally located fuel nozzle for adjusting and controlling the size of the cross-sectional area of the fuel nozzle, and a lance retraction adjustment device for adjusting the fuel injection position.
In a preferred embodiment of the present invention, the fuel spray gun further comprises an ignition gas nozzle, an ignition air nozzle and an ignition detection electrode at an outer position, wherein the fuel nozzle, the atomization gas nozzle, the ignition gas nozzle and the ignition air nozzle at the outer position are in a concentric sleeve form and are integrated, the nozzle opening of the ignition gas nozzle and the nozzle opening of the ignition air nozzle are communicated with a premixing chamber, the premixing chamber is communicated with an ignition burner combustion chamber, the ignition burner combustion chamber is communicated with an ignition flame nozzle, the ignition detection electrode is located in a channel of the combustion air nozzle, and an ignition end of the ignition detection electrode is located in the ignition burner combustion chamber.
In a preferred embodiment of the invention, the inner cavity of the air inlet shell is divided into an independent air chamber by a rear partition plate, the central air outside the air inlet shell is connected into the independent air chamber in the air inlet shell and then divided into two parts, one part of the central air enters the protective air conduit to surround the oxyhydrogen gas conduit until the protective nozzle, and the other part of the central air enters a channel of the ignition air nozzle to be used as ignition air of the ignition gas burner to enter the premixing chamber.
In a preferred embodiment of the invention, the fuel gas of the ignition gas nozzle is turned off after the main fuel of the fuel lance has been burned steadily, while the ignition air of the ignition air nozzle is turned on all the time, as part of the combustion air, which has the further effect of effectively blocking the effect of the high temperature combustion air on the fuel lance.
In a preferred embodiment of the invention, the flame firing signal of the firing gas nozzle is monitored by the ion signal of the firing electrode or by mounting UV at the inner viewing orifice.
The low NOx burner has the beneficial effects that on one hand, the high-speed jetting of oxyhydrogen gas of more than 200m/s and the formation of protective air at the outer side of the burner nozzle form the jet orifice, so that jet flows with different angles are formed to entrain smoke in the furnace, the catalytic property of the oxyhydrogen gas is utilized to improve the burnout rate, and the carbon black in the smoke is reduced. Meanwhile, the combustion speed of the fuel is controlled by the grading air distribution device, the local high temperature of the flame is reduced, and the change between the length of the combustion flame is achieved by utilizing the rotary air flow adjusting structure under the condition that the combustion power is unchanged, so that the shape of the combustion flame of the fuel and the combustion process are controlled, and the low NOx emission of different fuels is realized.
Drawings
FIG. 1 is a schematic perspective view of a low NOx burner according to a preferred embodiment of the present invention;
FIG. 2 is a schematic cross-sectional structural view of the low NOx burner of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional B-B structure of FIG. 2;
FIG. 4 is a schematic view of the cross-sectional C-C structure of FIG. 2;
FIG. 5 is a schematic illustration of the E-E cross-sectional structure of FIG. 2;
FIG. 6 is a left side schematic view of FIG. 5;
FIG. 7 is a schematic diagram of the structure of the right view of FIG. 5;
FIG. 8 is a schematic perspective view of a preferred embodiment of a stage air distributor for use in a low NOx burner of the present invention;
FIG. 9 is a schematic rear view of the stage air distribution device of FIG. 8;
FIG. 10 is a schematic view of the cross-sectional A-A configuration of FIG. 9;
FIG. 11 is a schematic view of the E-E cross-sectional structure of FIG. 10;
FIG. 12 is a schematic view of the partially enlarged structure of FIG. 10;
FIG. 13 is a schematic cross-sectional view of the first operational state of the stepped air distribution device of FIG. 8;
FIG. 14 is a schematic cross-sectional view of the stage air distribution device of FIG. 8 in a second operational state;
FIG. 15 is a schematic cross-sectional view of the third operational state of the stepped air distribution device of FIG. 8;
FIG. 16 is a schematic cross-sectional view of a fourth operational state of the stepped air distribution device of FIG. 8;
FIG. 17 is a schematic cross-sectional view of a fifth operational state of the stepped air distribution device of FIG. 8;
The components in the drawing are labeled 100-inlet housing, 140-back cover, 141-guard air interface, 142-inside observation monitor aperture, 143-outside observation aperture, 144-oxyhydrogen gas interface, 200-fuel lance, 210-fuel nozzle, 220-atomizing air nozzle, 221-fuel flow adjustment lever, 222-lance telescoping adjustment device, 230-ignition gas nozzle, 240-ignition air nozzle, 241-ignition air inlet, 250-ignition detection electrode, 260-premix chamber, 270-ignition burner combustion chamber, 280-ignition flame nozzle, 290-center fuel nozzle, 300-burner nozzle, 400-staged air distribution device, 421-air adjustment plate, 422-air adjustment indicating handle, 431-primary air flow nozzle, 432-secondary air flow nozzle, 451-secondary air flow conduit, 460-rotating air flow adjustment structure, 461-air guide tube, 463-vane, 464-cyclone back cover, 465-air adjustment tube, 466-connecting rod, 468-back sleeve, 469-adjustment structure, 4691-outside 4692-inside, 4693-handle, front partition plate, oxygen-471-air guide tube, 500-back air guide tube, 700-spiral tube air guide nozzle, 700-610-spiral tube air guide tube, and mounting plate.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Referring to fig. 1-17, it should be noted that the illustrations provided in this embodiment illustrate the basic concepts of the present invention, and that the components related to the present invention in the drawings are drawn according to the number, shape and size of the components in actual implementation. The embodiment of the invention comprises the following steps:
referring to fig. 1 to 7, a low NOx burner includes an air intake housing 100, a fuel injection lance 200, a burner nozzle 300, a stage air distributor 400, a protective air duct 500, and an oxyhydrogen gas duct 600.
The air intake housing 100 includes an internal cavity, an air intake, an air outlet, and a rear cover 140. In this embodiment, the air inlet housing 100 is L-shaped, and the air inlet and the air outlet are respectively at two ends of L. The rear cover 140 and the air outlet form a cylindrical cavity space. Referring to fig. 6, the rear cover is provided with a protective air port 141, an oxyhydrogen gas port 144, a mounting hole of the fuel spray gun 200, an inner observation monitoring hole 142 and an outer observation hole 143.
The burner ports 300 are installed at the air outlet. In this embodiment, the furnace body mounting plate 700 is mounted at the joint of the burner nozzle 300 and the air outlet, a plurality of mounting holes are formed in the furnace body mounting plate 700, the burner is mounted on the outer wall of the furnace body through bolts and other connecting pieces passing through the mounting holes, and the burner nozzle 300 extends into the furnace. As shown in fig. 2 and 7, the burner ports 300 are provided with a central fuel port 290, an ignition flame port 280, a primary air port 431, a secondary air port 432, an oxyhydrogen gas port 610 and a protective air port 510 in this order from the center to the periphery. The oxyhydrogen gas nozzle 610 is located at the axis of the protective air nozzle 510, and the oxyhydrogen gas nozzle 610 and the protective air nozzle are combined to form a combined nozzle. A plurality of secondary air flow jets 432 and a plurality of combined jets are spaced around the outer periphery of the burner orifice 300. The secondary air flow nozzles 432 entering in a grading way can be made into spray holes with different angles, can also be made into blades with certain angles, and are uniformly distributed and comprehensively applied to the outer side part of the burner nozzle 300 together with the spray holes formed by the oxyhydrogen gas and the protective air, so that the smoke circulation effect in the furnace is further improved, and the burner is suitable for combustion requirements of different fuel characteristics.
The grading air distribution device 400 comprises an air regulating device, a primary air flow channel, a secondary air flow channel and a rotary air flow regulating structure, wherein the air regulating device is arranged at an air inlet of the air inlet shell 100, the primary air flow channel and the secondary air flow channel are located in an inner cavity of the air inlet shell 100 and are relatively independent, the air regulating device comprises an air regulating plate, the air regulating plate can rotate and stay at least two limit positions, when the air regulating plate is located at the middle position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are simultaneously opened, when the air regulating plate is located at the first limit position, the inlet of the secondary air flow channel is closed, the inlet of the primary air flow channel is opened, when the air regulating plate is located at the second limit position, the inlet of the primary air flow channel is closed, the inlet of the secondary air flow channel is opened, the rotary air flow regulating structure comprises an air inlet channel, the air inlet channel is communicated with the first air flow channel, the rotary air flow regulating structure is provided with a first state and a second state, when the rotary air flow regulating structure is located at the middle position, the first state is located at the first limit position, the rotary air flow regulating structure is located at the first limit position, the air flow channel is formed through the air channel, and when the second air flow channel is located at the second air flow channel is formed through the rotary air channel.
The rotating air flow adjusting structure can change the rotational flow intensity of air flow at the primary air flow nozzle 431 to form conversion from direct current to strong rotational flow, so that the length and the diameter of flame can be changed under the condition that the combustion power is not changed, and the rotating air flow adjusting structure is suitable for heating requirements of different furnace volumes.
The grading air distribution device 400 is used for grading combustion air into an air shell, controlling the position of an air regulating plate to be randomly adjustable within 0-180 degrees through an air regulating indication handle outside the air shell, and obtaining that primary air flow and secondary air flow are adjustable within 5-95%, so that the mixing speed of air and fuel is controllable, graded combustion is realized, a combustion high temperature area is controlled, and the generation of thermal NOx is reduced. The staged air distribution device 400 can enable the burner to obtain a larger adjustment ratio when the total flow rate and the pressure of the main pipe allow the total flow rate of the combustion air to be close to twice that of the primary air flow or the secondary air flow.
The fuel spray gun 200 is mounted on the rear cover of the air inlet shell 100, and extends to the burner nozzle 300 through the air inlet channel of the rotary air flow adjusting structure, the air inlet end of the fuel spray gun 200 is positioned outside the air inlet shell 100, and the nozzle end of the fuel spray gun 200 is connected with the burner nozzle 300. The fuel spray gun 200 further comprises a fuel nozzle 210 at a central position, an atomizing gas nozzle 220, an ignition gas nozzle 230 at an outer position, an ignition air nozzle 240 and an ignition detection electrode 250, wherein the fuel nozzle 210 at the central position, the atomizing gas nozzle 220, the ignition gas nozzle 230 at the outer position and the ignition air nozzle 240 are in a concentric sleeve form and form a whole, the nozzle opening of the ignition gas nozzle 230 and the nozzle opening of the ignition air nozzle 240 are communicated to a premixing chamber 260, the premixing chamber 260 is communicated with an ignition burner combustion chamber 270, the ignition burner combustion chamber 270 is communicated with an ignition flame nozzle 280, the ignition detection electrode 250 is positioned in a passage of the combustion air nozzle, and an ignition end of the ignition detection electrode 250 is positioned in the ignition burner combustion chamber 270.
The fuel spray gun 200 is coaxially provided with a gas burner capable of forming independent ignition combustion, ignition gas and ignition air enter a combustion chamber to be ignited by an electrode after being mixed in the premixing chamber 260, the ignition combustion power can be selected according to the fuel property, annular flame is formed at the periphery of the fuel spray gun 200 to form an ignition source, and the fuel discharged from the fuel spray gun 200 can be effectively ignited. The gas of the ignition burner can be turned off after the main fuel of the fuel lance 200 is stably burned, and the ignition air is always turned on, and as a part of the combustion air, the ignition air has another function of effectively blocking the influence of the high-temperature combustion air on the fuel lance 200. The flame ignition signal of the ignition burner can be the ion signal of the ignition electrode, and UV monitoring can also be arranged at the inner observation hole.
The fuel of the fuel lance 200 positioned in the coaxial center is a liquid fuel, a gas fuel, a powdery solid fuel, or a mixture of a plurality of fuels. The fuel lance 200 further includes a fuel flow adjustment lever 221 in the passage of the centrally located fuel nozzle for adjusting and controlling the size of the area of the fuel nozzle cross section, and a lance retraction adjustment device 222 for adjusting the fuel injection position. The fuel and the oxidant can obtain a better mixing point, which is beneficial to the combustion of different fuels.
The protective air duct 500 is installed at the rear cover of the air intake housing 100 and extends to the burner nozzle 300, and the oxyhydrogen gas duct 600 is sleeved in the protective air duct 500 and extends to the burner nozzle 300. The oxyhydrogen pipe comprises an oxyhydrogen ring pipe and a plurality of oxyhydrogen straight pipes, the oxyhydrogen interface 144 is externally connected with the oxyhydrogen ring pipe in the air inlet shell 100 at the air inlet shell 100, and the oxyhydrogen straight pipes guide the oxyhydrogen to the nozzle. The combined jet opening formed by the protective air jet opening 510 of the protective air duct and the oxyhydrogen gas jet opening 610 of the oxyhydrogen gas duct forms an annular uniform distribution form at the outer side part of the burner jet opening 300, the oxyhydrogen gas jet opening 610 is made into different angles, the protective air jet opening is made into a swirl shape, the region of oxyhydrogen gas jet is enlarged, and the oxyhydrogen gas jet opening 610 is protected at the inner side. Meanwhile, the protection air can separate the influence of the high temperature of the combustion air on the oxyhydrogen gas conduit and the nozzle. The jet ports formed by the oxyhydrogen and the protective air are used for jetting at a high speed of more than 200m/s, jet flows with different angles are formed at the outer side part of the burner jet 300 in the furnace to entrain flame gas in the furnace, so that the flame gas is circularly diffused in the furnace to form a low-oxygen combustion atmosphere, the catalytic property of the oxyhydrogen is used for improving the burnout rate, reducing the air excess coefficient, reducing carbon black in flue gas, saving fuel and realizing low NOx emission.
The internal cavity of the air intake housing 100 is divided into an independent air chamber by a rear partition, and the protection air outside the air intake housing 100 is connected to the independent air chamber inside the air intake housing 100 and then divided into two parts, wherein one part of the protection air enters the protection air conduit to surround the oxyhydrogen gas conduit until reaching the protection nozzle, and the other part of the protection air enters the channel of the ignition air nozzle 240 to serve as ignition air of the ignition gas burner to enter the premixing chamber 260.
The stepped air distribution device 400 described in connection with fig. 8 to 17 includes an air intake housing 100, an air adjustment device, a nozzle (i.e., a burner spout 300), a primary air flow channel, a secondary air flow channel, and a rotary air flow adjustment structure 460.
The air intake housing 100 includes an internal cavity, an air intake, and an air outlet. In this embodiment, the air inlet housing 100 is L-shaped, and the air inlet and the air outlet are located at two ends of the L-shape.
The burner nozzle 300 is installed at the air outlet of the air inlet housing 100, the tail end of the burner nozzle 300 is connected with the air outlet of the air inlet housing 100, in this embodiment, the tail end of the burner nozzle 300 and the air outlet of the air inlet housing 100 are detachably connected and fixed by a connecting piece such as a bolt, or may be fixed by other manners. The outlet of the burner ports 300 is provided with a primary air flow port 431 and a secondary air flow port 432. The secondary air flow nozzles 432 are spray holes with different angles or spray holes formed by blades with certain angles, and can be replaced according to different combustion characteristics.
The air regulating device is installed at the air inlet of the air inlet housing 100. The wind adjusting device comprises a wind adjusting plate 421 and a wind adjusting indicating handle 422 which are connected with each other, the wind adjusting plate 421 is installed in the air inlet shell 100, the wind adjusting indicating handle 422 is installed outside the air inlet shell 100, and the angle position of the wind adjusting plate 421 can be adjusted by twisting the wind adjusting indicating handle 422. The damper 421 is capable of rotating and may rest in at least two extreme positions, a first extreme position and a second extreme position. The air regulating plate 421 is positioned at the middle position, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are simultaneously opened, the air regulating plate 421 is positioned at the first limit position, the inlet of the secondary air flow channel is closed, the inlet of the primary air flow channel is opened, and the air regulating plate 421 is positioned at the second limit position, the inlet of the primary air flow channel is closed, and the outlet of the secondary air flow channel is opened.
The primary air flow channel and the secondary air flow channel are located in the inner cavity of the air inlet shell 100, the primary air flow channel and the secondary air flow channel are relatively independent, the inlet of the primary air flow channel and the inlet of the secondary air flow channel are located at the air inlet of the air inlet shell 100, and the outlet of the primary air flow channel and the outlet of the secondary air flow channel are located at the air outlet of the air inlet shell 100. Specifically, a front partition 471 and a rear partition 472 are disposed in the internal cavity of the air intake housing 100, the front partition 471 is located at an air outlet of the air intake housing 100, the rear partition 472 is located at an air inlet of the air intake housing 100, and the rear partition 472 divides the internal cavity into a first cavity through which the primary air flow passes and a second cavity through which the secondary air flow passes. The secondary air flow channel includes a plurality of secondary air flow conduits 451, the front ends of the secondary air flow conduits 451 are mounted on the front partition 471 and communicate with the burner ports 300, the rear ends of the secondary air flow conduits 451 are mounted on the rear partition 472 and communicate with a second cavity through which the secondary air flow passes, and the second cavity, the secondary air flow conduits 451 and the burner ports 300 form the secondary air flow channel. The first cavity through which the primary air flows is the primary air flow channel.
The rotary airflow adjusting structure 460 comprises an air inlet channel, the air inlet channel is communicated with the first airflow channel, the rotary airflow adjusting structure 460 is provided with a first state and a second state, the air inlet channel forms a cyclone channel when the rotary airflow adjusting structure 460 is located in the first state, and the air inlet channel forms a straight air channel when the rotary airflow adjusting structure 460 is located in the second state.
Specifically, the rotary airflow adjusting structure 460 comprises an air duct 461, a cyclone adjuster and a regulator, wherein the air duct 461 is positioned at the outlet of the burner nozzle 300, the cyclone adjuster and the cyclone adjuster are positioned in the inner cavity, the cyclone adjuster comprises a rear sleeve 468 and a cyclone adjuster 465, the rear sleeve 468 is installed at the tail end of the inner cavity, the cyclone adjuster 465 comprises a slotted section and a sealing section, the slotted section of the cyclone adjuster 465 is sleeved with the rear sleeve 468, one end of the cyclone adjuster is connected with the sealing section of the cyclone adjuster 465, the other end of the cyclone adjuster is connected with the air duct 461, the regulator is connected with the cyclone adjuster 465, the cyclone adjuster is adjusted to move back and forth between the rear sleeve 468 and the air duct 461, the cyclone adjuster is communicated with the air duct 461 to form a cyclone channel when the cyclone adjuster 650 is positioned at the rear end, and the cyclone adjuster 465 is communicated with the air duct 461 to form a cyclone channel when the cyclone adjuster 650 is positioned at the front end.
The cyclone comprises a cyclone front cover, a cyclone rear cover 464 and blades 463, wherein the blades 463 are arranged between the cyclone front cover and the cyclone rear cover 464, a sealing section of the cyclone regulating tube 465 is connected with the cyclone rear cover 464, and the air duct 461 is connected with the cyclone front cover 620. In this embodiment, the cyclone front cover is a part of the front partition 471. In connection with fig. 10, the blades 463 are single, and are uniformly distributed and installed in a forward direction, and the airflow is guided by the blades 463 to form right-handed rotary wind. The cyclone back cover 464 has an inner diameter conforming to the inner contour of the blade 463 and is in clearance fit with the outer diameter of the sealing section of the tuning coil 465.
The cyclone is positioned in the inner cavity, one end of the cyclone is connected with the cyclone, and the other end of the cyclone is connected with the rear end of the air inlet shell 100. The spinner includes a spinner tube 465 and a rear sleeve 468, the rear sleeve 468 being mounted at the rear end of the interior cavity, and the rear end of the rear sleeve 468 being closed. The coil 465 includes a slotted section and a sealing section, the slotted section of the coil 465 being nested with the rear sleeve 468, and further preferably the rear sleeve 468 is either an inner diameter fit or an outer diameter clearance fit with the slotted section of the coil 465. The sealing section of the cyclone tube 465 is connected to the cyclone rear cover 4, and the air duct 461 is connected to the cyclone front cover. As an example, the sealing section of the coil 465 is a smooth tube, and the grooved section of the coil 465 is a tube with 6 grooves uniformly distributed on the surface. By way of example, the slotted equivalent cross-section of the slotted section of the tuning coil 465 is identical to the equivalent cross-section formed by the blades 463, all in the shape of a long slot. The regulator regulates the back and forth movement of the coil 465 between the rear sleeve 468 and the air duct 461, and in order to facilitate the restriction of the displacement distance of the coil 465, the outer wall of the coil 465 in this embodiment has a convex structure and is located at the junction of the sealing section and the slotting section of the coil 465. As shown in connection with fig. 10, when the tuning coil 465 is positioned at the front end, the protruding structure contacts the cyclone rear cover 464 to restrict the forward displacement of the tuning coil 465.
The regulator comprises an adjusting structure 469 and a connecting rod 466, wherein the adjusting structure 469 is installed on the outer side of the air inlet shell 100, one end of the connecting rod 466 is connected with the adjusting structure 469, and the other end is connected with the coil 465. In order to facilitate the connection with the connecting rod 466, the outer wall of the tube of the coil 465 has a protruding ear-shaped connection structure, the connecting rod 466 is connected with the ear-shaped connection structure, and the ear-shaped connection structure is located at the connection position of the sealing section and the slotting section of the coil 465. The adjusting structure 469 is a threaded rotary conversion linear pulling mode, and is located at the outer side of the air inlet housing 100 and connected with the connecting rod 466. Specifically, the adjusting structure 469 includes an outer spiral pipe 4691 and an inner spiral pipe 4692, the front end of the outer spiral pipe 4691 is fixed on the outer side of the air intake housing 100, the front end of the inner spiral pipe 4692 is connected with the rear end of the outer spiral pipe 4691 through threads, the connecting rod 466 is sleeved in the outer spiral pipe 4691 and the inner spiral pipe 4692, the front end of the connecting rod 466 is connected with the adjusting pipe 465, and the rear end of the connecting rod 466 is connected with the rear end of the inner spiral pipe 4692. For convenient adjustment, the rear end of the inner coil 4692 is provided with a handle 4693.
The adjusting structure 469 in this embodiment has a motion process that the handle 4693 outside the adjusting structure 469 is rotated to drive the connecting rod 466 to move forward or backward, so as to link the coil 465 to move forward or backward, so that the air flow can be converted between the air inlet slot formed by the tangential blade and the straight slot at the rear end of the coil.
The rotating airflow adjusting structure 460 in this embodiment is shown in connection with fig. 10 and 13, in which the cyclone is connected to the air duct 461 to form a cyclone passage when the cyclone tube 650 is positioned at the rear end. Specifically, when the tuning coil 650 is positioned at the rear end, a slotted section of the tuning coil 650 is positioned at the rear sleeve 468, a straight slot of the slotted section is closed by the rear sleeve 468, and an air intake slot formed by tangential blades of the cyclone is opened. Thus, the air enters the primary air flow channel from the air inlet of the air inlet housing 100, flows through the air inlet grooves formed by the tangential blades of the cyclone to form a rotating air flow, and finally is discharged from the air duct 461. Referring to fig. 14, when the coil adjusting tube is located at the front end, the coil adjusting tube is communicated with the air duct to form a straight air channel. Specifically, when the tuning coil 650 is positioned at the front end, the slotted section of the tuning coil 650 is spaced apart from the rear sleeve 468, the straight slot of the slotted section is opened, and the sealing section of the tuning coil 650 is positioned in the cyclone, so that the air inlet slot formed by the tangential blades of the cyclone is closed. Such that air flow enters the primary air flow path from the air inlet of the air inlet housing 100 and then flows through the straight slot of the slotted section of the flow regulating tube 650 and enters the sealing section of the flow regulating tube 650. An axial air flow is formed and finally discharged from the air duct 461.
The rear end of the air duct 461 is mounted on the front partition 471, and the front end of the air duct 461 is mounted at the air outlet of the burner ports 300 and extends out of the air outlet of the burner ports 300. The air duct 461 is located at the coaxial center of the burner ports 300, and a plurality of the secondary air flow conduits 451 are installed around the air duct 461.
The angle position of the air regulating plate 421 of the grading air distribution device 400 can be arbitrarily adjustable between 0 degrees and 180 degrees, and the primary air flow and the secondary air flow can be adjusted between 5 percent and 95 percent. Meanwhile, the primary air flow is adjustable between direct current wind and rotational flow wind. So that the ratio and the rotation strength of the primary air and the secondary air at the nozzle can be changed, and flames with different shapes can be obtained when the burner is used. The maximum of the primary air flow and the secondary air flow can flow in 95% of combustion air, the position of the air regulating plate 421 is in a middle state, and when the total air flow and the pressure of the main pipe allow, the total flow of the combustion air is close to twice of that of the primary air flow or the secondary air flow, so that the burner can obtain a larger regulating ratio.
Referring to fig. 13, in the first working state of the stage air distribution device 400, the rotary air flow adjusting structure 460 is adjusted to a first state, that is, the air inlet channel is a cyclone channel, the air adjusting plate 421 is adjusted to a first limit position, the secondary air flow channel is closed, the primary air flow forms a pressure chamber between the front partition 471 and the rear partition 472, 95% of combustion air blown into the air inlet housing 100 forms rotary air flow after passing through the cyclone channel, tangential cyclone air, that is, radial diffusion air flow is formed at the primary air flow nozzle 431, and the secondary air flow at the outer side is very small and is controlled to be about 5%.
Referring to fig. 14, in the second operating state of the stage air distribution device 400, the rotary air flow adjusting structure 460 is adjusted to a second state, that is, the air inlet channel is a straight air channel, the air adjusting plate 421 is adjusted to a first limit position, the secondary air channel is closed, the primary air flow forms a pressure chamber between the front partition 471 and the rear partition 472, 95% or more of the combustion air blown into the air inlet housing 100 forms axial air through the cyclone channel, the axial direct air is formed at the primary air flow nozzle 431, and the secondary air flow at the outer side is controlled to be about 5%.
As shown in fig. 15, the third working state of the stage air distribution device 400 is that the air regulating plate 421 is adjusted to the second limit position, the primary air flow channel is closed, the secondary air flow forms a pressure cavity in front of the secondary air flow nozzle 432 through the secondary air flow duct 451, 95% or more of the combustion air blown into the air intake housing 100 forms a diffusion air flow at the secondary air flow nozzle 432, and the primary air flow at the inner side is controlled to be about 5%.
As shown in fig. 16, the fourth operation state of the stage air distribution device 400 is to adjust the air regulating plate 421 to a middle position value, and the combustion air blown into the air intake housing 100 forms 50% of the primary air flow and 50% of the secondary air flow. The rotating airflow adjusting structure 460 is adjusted to the rotational flow position, and 50% of the primary airflow is rotational flow wind.
As shown in fig. 17, the fifth working state of the stage air distribution device 400 is to adjust the air regulating plate 421 to a middle position value, and the combustion air blown into the air intake housing 100 forms 50% of primary air flow and 50% of secondary air flow. The rotary airflow adjusting structure 460 adjusts to the dc position, and 50% of the primary airflow is dc.
The other working states of the graded air distribution device 400 are not listed one by one, the graded air distribution device 400 performs joint adjustment through the rotary air flow adjusting structure 469 and the air adjusting plate position, the ratio and the rotary strength of primary air and secondary air sprayed out of the nozzle can be changed, flames with different shapes can be obtained when the graded air distribution device is used on a burner, the graded air distribution device is suitable for different furnace body forms, and the fuel mixing effect is improved. The combustion speed of the fuel is controlled through grading air distribution, so that the emission of NOx in the flue gas can be effectively reduced.
The low NOx burner disclosed by the invention integrates an injection port formed by oxyhydrogen gas and protective air, a grading air distribution device 400, a rotary air flow adjusting structure, a fuel spray gun 200 positioned in the coaxial center and a burner nozzle capable of forming independent ignition combustion on the coaxial periphery of the fuel spray gun 200, so that the combustion effect of the burner is comprehensively improved, and the fuel cost advantage can be better reflected on the combustion using inferior fuel.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value. The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.