CN201880464U - Seawater desulfurizer - Google Patents

Abstract

The utility model discloses a seawater desulfurizer, which comprises a counter-flow seawater spray tower provided with a flue gas input pipe and a flue gas output pipe. Spray layers and demisters are arranged inside the spray tower, wherein the spray layers are connected with seawater supplying pipes. An opening of the flue gas input pipe is arranged below the spray layers, and the demisters are arranged above the spray layers, while an opening of the flue gas output pipe is arranged above the demisters. The seawater desulfurizer is characterized in that a seawater pond used for collecting spraying seawater is arranged at the bottom of the spray tower, and the seawater pond is one meter to five meters deep and connected with a new seawater supplying pipe and aerator pipes used for guiding air. A seawater draining pipe is positioned at the bottom of the seawater pond. By the aid of the seawater desulfurizer and by means of seawater desulfurization, the sulfur dioxide removal ratio can reach more than 95 percent, and desulfurized seawater discharge indexes include that pH (potential of hydrogen) >=6.8 and DO (dissolved oxygen) >= 5mg/1 or over 90 percent of saturated DO are reached, thereby requirements of environment emission standards can be met simultaneously and environmental protection effects are excellent.

Description

The sea water desulfuration device

Technical field

The utility model relates to the flue gas desulfurization technique of thermal power plant and industrial burning device, a kind of specifically sea water desulfuration device.

Background technology

At present, in wet desulfurizing process, using more technology is to adopt in the absorption tower flue gas to be washed to reach the purpose of desulfurization and dedusting as absorbent with calcium bases such as limestone/limes.This technology is owing to need subsystems such as limestone/lime preparation system, desulfurizing byproduct-gypsum treatment system, Waste Water Treatment, emergency system, whole desulphurization system complex process, the initial investment cost is big, operating cost is high, and equipment such as absorption tower and pipe-line system deposit calcium sulfate easily and cause problem such as fouling obstruction, thereby increase maintenance workload and upkeep cost.

For this reason, in the flue gas desulfurization technique field, begin to utilize the condensation seawater in the direct row sea of power plant or industrial burning device, recycling absorbent as flue gas desulfurization, the acid seawater after the desulfurization need carry out after-treatment and recovery, meet environmental emission just can enter after requiring marine.Conventional seawater desulfurizing and absorption tower adopts packed tower, the packed tower seawater is when having good smoke SO 2 absorbent properties, the absorbent properties that have good flue gas CO2 too, but the CO2 that absorbs has increased burden to the restoring sea water and the processing in downstream, absorption tower, is difficult to promote the pH value of desulfurization discharging seawater.For this reason, people have carried out constantly improving to the technical scheme of utilizing sea water desulfuration, disclosed a kind of flue gas desulfurization with seawater device in for example Chinese utility model patent 200920004229.7, its seawater desulfurizing process and device are made up of flue gas system, absorption tower, sea water supply and seawater quality recovery system, but the seawater desulfurizing process and the device of routine in the prior art, in order to reach the environmental emission requirement, engineering construction initial investment cost is also relative with operating cost higher, and the seawater quality recovery system mainly is made up of aerator.Though conventional seawater desulfurizing process can satisfy higher desulfuration efficiency (95% desulfuration efficiency), but but be difficult to satisfy high-level desulfurization seawater discharge index (as 90% and the COD increment that are difficult to reach DO 〉=5mg/l or saturated DO reach the drainage index of the pH of reaching more than 90%, more difficult 〉=6.8 less than 0.5mg/l and sulfurous acid oxygenation efficiency), and the civil engineering cost of aerator is also relatively more expensive, and the operating cost of aerator is than higher.

The utility model content

The purpose of this utility model is at deficiency of the prior art, the sea water desulfuration device that the initial cost that provide that a kind of cost of investment and operating cost are lower, desulfuration efficiency and all high especially desulfurization seawater quality of desulfurization seawater discharge index recovers is more economized is applicable to the flue gas desulfurization of Coastal Power Station or industrial burning device.

The technical solution of the utility model is as follows:

A kind of sea water desulfuration device, comprise reverse flow type seawater spray column with flue gas input pipe and flue gas efferent duct, in spray column, be provided with spraying layer and demister, spraying layer is connected with the sea water supply pipeline, each position component relation is, the mouth of pipe of flue gas input pipe is positioned at the spraying layer below, demister is above spraying layer, the mouth of pipe of flue gas efferent duct is positioned at the demister top, it is characterized in that: the seawater pond that also has the sprayed sea water of converging in the spray column bottom, the dark 1m-5m in seawater pond is connected with fresh seawater supply pipe and the aeration tube of introducing air in the seawater pond, the seawater discharge pipe is arranged at bottom, seawater pond.

Preferably, described fresh seawater supply pipe is connected to the sea water supply pipeline.

Preferably, on fresh seawater supply pipe, be provided with valve.

Preferably, described sea water supply pipeline is connected to the condensation seawater from power plant.

Preferably, the spray column spraying layer is arranged in spray column, top, is made of the spraying layer interlaced arrangement the layer 2-4 spraying layer.

Preferably, spraying layer is rearranged by shower, and shower is made of the spray arm that sprays the person in charge and be connected on the spray person in charge, and the spray person in charge extends to outside the tower and is connected with the sea water supply pipeline, arrange nozzle on the spray person in charge and arm, nozzle material is a carborundum.

Preferably, the seawater discharge pipe of bottom, seawater pond is connected to the two-stage aeration tank in downstream.

The beneficial effects of the utility model are as follows: sea water desulfuration method and apparatus of the present utility model, the sulfur dioxide removal rate can reach more than 95%, desulfurization discharging seawater pH 〉=6.8, DO 〉=5mg/l or more than 90% of saturated DO can satisfy the environmental emission index request simultaneously, and environmental benefit is good.

Sea water desulfuration method and apparatus of the present utility model also further has following characteristics:

1, adopts the recycling desulfurization of full sea water of power plant condenser condensation, do not add any alkaline matter and catalyst;

2, the desulfurization seawater quality recover to adopt one-level aeration and/or aeration tank secondary aeration in the spray Tata, particularly adopt spray column one-level aeration after, can alleviate the burden and the expensive construction investment cost of aeration tank, downstream secondary aeration greatly;

3, sulfur removal technology is to flue gas load and SO₂The adaptive capacity of concentration is strong, but regulating measure is flexible;

4, desulfurizing byproduct is stable sulfate ion, and is drained in the seawater, can be in harmonious proportion seawater salinity;

5, desulphurization system operational reliability, safe;

6, spray column is adopted on the absorption tower, and resistance is little and constant;

7, investment and operating cost are low, the basic Maintenance free of desulphurization system.

Description of drawings

The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:

Fig. 1 is the schematic diagram of the utility model specific embodiment seawater desulfurizing process flow process.

Fig. 2 is the schematic diagram of one-level aeration tube in the utility model specific embodiment.

Fig. 3 is the schematic diagram of secondary aeration tube in the utility model specific embodiment.

Fig. 4 is the schematic diagram of the boring aeration pipe that one-level aeration tube and secondary aeration tube are adopted among the embodiment.

The specific embodiment

As shown in Figure 1, specific embodiment of the utility model, a kind of technological process of sea water desulfuration and device: from boiler of power plant or industrial burning device 100 ℃-180 ℃ the SO that contains₂Former flue gas through former gas baffle,booster fan boost 13, flue gas heat exchange device (GGH) 12 heat exchange enter reverse flow type seawater desulfurizing spray column 1 after being cooled to 70 ℃-100 ℃, in spray column 1, the seawer washing that flue gas is sprayed by spraying layer 2, SO₂Gas and part flue dust are removed SO by Absorption by Sea Water₂Discharge from clean exhanst gas outlet after demister 3 demists on 20 ℃-40 ℃ clean flue gas process spray column top behind the pernicious gas, heat exchange enters atmosphere by clean gas baffle fromchimney 14 after being warming up to more than 70 ℃ through GGH.Flue gas line equipment such as gas baffle,booster fan 13 and GGH12 and gas bypass can not be provided with fully according to actual demands of engineering or the part configuration.

Concrete sweetening process in above-mentioned flow process is as follows: former flue gas enters spray column 1 by the flue gas input pipe of spray column, tower body is a cylindrical structural, material is carbon steel or armored concrete inside lining anti-corrosive coating or inner liner stainless steel, in spray column 1, be provided with spraying layer 2 and demister 3, spraying layer 2 is connected with sea water supply pipeline 6, the mouth of pipe of flue gas input pipe is positioned at spraying layer 2 belows, demister 3 is above spraying layer 2, the mouth of pipe of flue gas efferent duct is positioned at demister 3 tops, export by the flue gas efferent duct behind the flue gas washing desulphurization, the seawater pond 4 that also has the sprayed sea water of converging in the spray column bottom, seawater pond 4 dark 1m-5m, be connected with the firstorder aeration tube 8 of fresh seawater supply pipe 7 and introducing air in the seawater pond 4,seawater discharge pipe 10 is arranged at 4 bottoms, seawater pond.Fresh seawater is the condensation seawater that utilizes to come from power plant, and the condensation seawater flows automatically to the pump group pond 5 that desulphurization system is provided with near spray column.Pump group pond 5 is the underground type reinforced concrete structure, and next-door neighbour's pump group pond is provided with pump house, arranges 2-4 platform pump in the pump house, via sea water supply pipeline 6 seawater in pump group pond 5 is risen to the spraying layer 2 of spray column 1, every the corresponding 1-2 layer of pump spraying layer 2.SO in spray column 1₂The Absorption by Sea Water that is sprayed by spraying layer becomes sulfurous acid and resolves into sulfite ion.Absorbed SO₂Sprayed sea water converge to the seawater pond 4 of spray column 1 bottom, the desulfurization seawater mixes with the fresh seawater of seawater supply pipeline 7 in seawater pond 4, this fresh seawater supply is drawn from the sea water supply pipeline 6 of orlop spraying layer 2 and is connect one road seawater supply to spray column seawater pond 4, after making the mixing seawater reach certain pH value, through one-level aeration in the tower, tentatively or fully improve pH, behind DO increment and the sulfite ion partial oxidation again the flow by gravity aeration tank 11 secondary aerations that are discharged to the downstream carry out Inka aeration, depth recovery is handled, sulfite ion all is oxidized to stable sulfate ion, pH, DO, COD increment etc. enters the sea after returning to and satisfying the seawater discharge standard fully.According to actual demands of engineering, the seawater supply in spray column seawater pond 4 can be provided with a pump separately the sea water pump in pump group pond is delivered to spray column seawater pond 4, on the seawater supply pipeline 7 valve can be set, sea water supply pipeline 6 and seawater supply pipeline 7 are force pipe, adopt glass-reinforced plastic material.Simultaneously, restoring sea water can be according to actual demands of engineering and difference can take to spray Tata maritime interior waters pond one-level aeration and/or aeration tank 11 secondary aerations.Flowing to the aeration tank in downstream and 4 seawater of discharging mix once more from spray column seawater pond via pipeline 9 after, remaining seawater overflow in pump group pond or undercurrent carry out aeration by secondary aeration tube 11.

The spray column 1 that adopts in the present embodiment, physical dimensions such as the diameter of spray column 1, the spray number of plies, height are according to the actual needs of engineering and difference, and spraying layer 2 is 2 layers to 4 layers.Spraying layer 2 interlaced arrangement, spraying layer 2 is responsible for and arm is a reducer pipe, arranges nozzle on the spraying layer person in charge and the arm.Demister is arranged in spray column spraying layer top, is ridge type or board-like or deflector type, and material is polypropylene (PP).Demister and spraying layer all adopt the brace summer that is overlapped on the spray column inside to support.Desulfurization seawater floss hole at the bottom of the tower and water seal board, overflow plate combination are arranged.

Shown in Figure 2 is one-level aeration in the spray column, andaeration tube 8 adopts ductwork type aeration tube 8-1, and the pipe network material adopts fiberglass, and the aeration air provides by being arranged in tower outer roots-type or centrifugal fan.

Shown in Figure 3 is the aeration tank secondary aeration tube 11 of seawater quality recovery system, provide the aeration air to enter aeration by centrifugal blower and be responsible for 11-1, it is public air compartment/tubular construction that aeration is responsible for 11-1, adopt armored concrete or glass-reinforced plastic material, the air of aeration person in charge 11-1 is blown into via aeration arm 11-2 and carries out aeration in the seawater.Aeration arm 11-2 adopts fiberglass, gripper shoe 11-3 is set supports, and gripper shoe 11-3 is a reinforced concrete structure.

Above-mentioned one-level aeration tube and secondary aeration tube aeration adopt boring aeration pipe 11-4 structure as shown in Figure 4, the aperture 3mm-9mm of solarization air cap 11-4.

In the above-described embodiments, desulfurization absorbent adopts the in line full sea water of power plant's condensation or industrial burning device cooling, does not add any alkaline matter and catalyst.

Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.

Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.

The utility model is not limited to the aforesaid specific embodiment.The utility model expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.

Claims (7)

1. sea water desulfuration device, comprise reverse flow type seawater spray column with flue gas input pipe and flue gas efferent duct, in spray column, be provided with spraying layer and demister, spraying layer is connected with the sea water supply pipeline, each position component relation is, the mouth of pipe of flue gas input pipe is positioned at the spraying layer below, demister is above spraying layer, the mouth of pipe of flue gas efferent duct is positioned at the demister top, it is characterized in that: the seawater pond that also has the sprayed sea water of converging in the spray column bottom, the dark 1m-5m in seawater pond is connected with fresh seawater supply pipe and the aeration tube of introducing air in the seawater pond, the seawater discharge pipe is arranged at bottom, seawater pond.

2. sea water desulfuration device according to claim 1 is characterized in that, described fresh seawater supply pipe is connected to the sea water supply pipeline.

3. sea water desulfuration device according to claim 1 is characterized in that, is provided with valve on fresh seawater supply pipe.

4. sea water desulfuration device according to claim 1 and 2 is characterized in that, described sea water supply pipeline is connected to the condensation seawater from power plant.

5. sea water desulfuration device according to claim 1 is characterized in that the spray column spraying layer is arranged in spray column, top, is made of the spraying layer interlaced arrangement the layer 2-4 spraying layer.

6. sea water desulfuration device according to claim 1, it is characterized in that, spraying layer is rearranged by shower, the spray arm that shower is responsible for and is connected on the spray person in charge by spray constitutes, spray is responsible for to extend to outside the tower and is connected with the sea water supply pipeline, arrange nozzle on the spray person in charge and arm, nozzle material is a carborundum.

7. sea water desulfuration device according to claim 1 is characterized in that, the seawater discharge pipe of bottom, seawater pond is connected to the downstream two-stage aeration tank.

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