CN202410458U

CN202410458U - Combined pollutant removing device

Info

Publication number: CN202410458U
Application number: CN2011204694117U
Authority: CN
Inventors: 刘大华; 戴永阳; 葛介龙; 周超炯; 傅峡; 裴磊; 黄国义
Original assignee: ZHEJIANG FEIDA DESULFURATION ENGINEERING Co Ltd; Zhejiang Feida Environmental Science and Technology Co Ltd
Current assignee: ZHEJIANG FEIDA DESULFURATION ENGINEERING Co Ltd; Zhejiang Feida Environmental Science and Technology Co Ltd
Priority date: 2011-11-23
Filing date: 2011-11-23
Publication date: 2012-09-05
Anticipated expiration: 2021-11-23

Abstract

The utility model discloses a combined pollutant removing device, comprising a removing tower, wherein a smoke inlet is arranged at the lower part of the removing tower; a smoke outlet is arranged at the upper part of the removing tower; in the removing tower, a desulfurization spraying layer, a pipe type demister and an electric dust remover are sequentially arranged between the smoke inlet and the smoke outlet from bottom to top; and a slurry tank for storing limestone slurry is further arranged below the smoke inlet. The combined pollutant removing device disclosed by the utility model integrates three removing steps into one removing tower so that the problem that the existing FGD (Flue Gas Desulfurization) device cannot remove PM2.5 (Particulate Matter 2.5) micro-dust and SO3 acid mist sol is solved and the problems of 'gypsum rain' and GGH (Gas-Gas Heater) plugging are solved.

Description

A kind of combined pollutant removes device

Technical field

The utility model relates to the environmental protection science field, and particularly a kind of combined pollutant removes device.

Background technology

Combined pollution is meant that there is formed environmental pollution phenomenon simultaneously in two or more variety classes pollutant of different nature in same environment, can cause that the pollutant of combined pollution phenomenon is called combined pollutant, like SO in the flue gas ₂, NO _X, acid mist aerosol, mercury, NH ₃, PM _2.5Deng, they can be each other in atmosphere or and other pollutants react, produce more serious atmosphere pollution.Thermal power plant is the main emission source of these pollutants, and the fume desulfurizing tower of existing thermal power plant can remove multiple pollutant through cleaning function, but to PM _2.5The removal effect of micronic dust, mercury, acid mist aerosol etc. is very little, and there is following problem in prior art:

1) can't remove PM _2.5Micronic dust: behind the power-plant flue gas process electric cleaner, the PM in the flue gas ₁₀And above particle can effectively be removed the desulfurizing tower that the flue gas process is follow-up, PM _2.5Particulate still can not obtain wash-out, and the demister on the in addition existing FGD is mainly removed the above drop of 25 μ m, also can't tackle the following drop of 15 μ m.Final PM _2.5Drop below micronic dust and the 15 μ m enters environment with flue gas, causes atmosphere pollution;

2) lower to the aerosol clearance: SO ₃The acid mist particulate can influence microphysical property, optical characteristics and the lifetime of cloud as cloud condensation nucl or ice-nucleus in atmosphere, and then can influence radiation characteristic of precipitation forming process and cloud etc., finally influences weather, the SO in the flue gas ₃Acid mist also has very strong corrosiveness to chimney, and existing technology, almost to SO ₃The acid mist aerosol can't be removed;

3) " gypsum rain " problem occurs: at present, increasing desulfurizer has been cancelled gas-to-gas heat exchanger (GGH), and exhaust gas temperature only has about 50 ℃; Saturated flue gas condensation in wet chimney forms drop; Contain in the drop and be not removed gypsum slurries and dust, because exhaust gas temperature is low, flue gas can not obtain effective lifting and remote diffusion; Gypsum slurries in the flue gas and dust droplet settling form " gypsum rain " phenomenon to the chimney near zone;

4) GGH blockage problem: in not cancelling the FGD device of GGH, because gypsum slurries particle and dust drop that flue gas carries, in GGH, condensing forms the gypsum dirt, seriously stops up GGH;

5) flow field in tower skewness problem: do not have the flue gas even distribution setting in traditional fume desulfurizing tower, so the flue gas flow field skewness, influence removes fog effect to a certain extent.

Summary of the invention

The utility model problem to be solved just provides a kind of combined pollutant and removes device, can effectively solve existing FGD device to PM _2.5Micronic dust and SO ₃The acid mist aerosol can't be removed problem and " gypsum rain " and GGH blockage problem.

In order to solve the problems of the technologies described above; The utility model adopts following technical scheme: a kind of combined pollutant removes device; It is characterized in that: comprise removing tower, the bottom that removes tower is provided with gas approach, and the top that removes tower is provided with exhanst gas outlet; In removing tower, between gas approach and exhanst gas outlet, be provided with desulfurization spraying layer, tubular type demister and electric cleaner from bottom to up successively, be positioned at the gas approach below and also be provided with the slurries pond that stores lime stone slurry.

Further, said desulfurization spraying layer comprises shower and the some spray apertures that are located at the shower bottom.

Further, be provided with circulating pump between said shower and the slurries pond and realize that lime stone slurry recycles.

Further, said tubular type demister comprises the stay pipe of some demist pipes that laterally arrange and supporting demist pipe, and the demist pipe is provided with one deck at least.

Further, the caliber of said demist pipe is 5mm～300mm, and the center distance of close in twos demist pipe is 10mm～800mm.

Further, said demist pipe is provided with two-layer at least, and the interlamellar spacing between the close two-layer demist pipe is 10mm～800mm.

Further, said electric cleaner is a wet electrical dust precipitator, comprises some dust collecting electrode and is located at the some corona discharge electrodes between the dust collecting electrode, is provided with the sparge pipe that is connected with the outside network of rivers in the wet electrical dust precipitator upper end.

Further, said control of dust honeycomb type very.

Further, said control of dust template very.

After adopting technique scheme, the utlity model has following advantage: three remove step and concentrate on one and remove in the tower, have saved the top demister in traditional desulfurizing tower, efficiently remove PM _2.5Micronic dust and SO ₃The acid mist aerosol, the tubular type demister has not only alleviated the load of wet electrical dust precipitator, and has been uniformly distributed with the flue gas flow field in the tower, has improved the trapping ability of device to fine particle, can effectively avoid " gypsum rain " phenomenon.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described further:

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the structural representation of tubular type demister in the utility model;

Fig. 3 is the structural representation that adopts the electric cleaner of honeycomb type dust collecting electrode in the utility model;

Fig. 4 is the structural representation that adopts the electric cleaner of template dust collecting electrode in the utility model.

The specific embodiment

A kind of embodiment of the utility model as shown in Figure 1; A kind of combined pollutant removes device; Comprise removing tower 1, the bottom that removes tower is provided with gas approach 11, and the top that removes tower is provided with exhanst gas outlet 12; In removing tower, between gas approach and exhanst gas outlet, be provided with desulfurization spraying layer 2, tubular type demister 3 and electric cleaner 4 from bottom to up successively, be positioned at the gas approach below and also be provided with the slurries pond 13 that stores lime stone slurry.

The desulfurization spraying layer comprises shower 21 and the some spray apertures that are located at the shower bottom.In the present embodiment, be provided with circulating pump 5 between shower and the slurries pond and realize that lime stone slurry recycles.As shown in Figure 2; The tubular type demister comprises the stay pipe 32 of some demist pipes that laterally arrange 31 and supporting demist pipe; The demist pipe is provided with one deck at least, and the caliber of demist pipe is 5mm～300mm, and the center distance of close in twos demist pipe is 10mm～800mm; The caliber of demist pipe increases, and the center distance of correspondingly close in twos demist pipe also increases; If the demist pipe is provided with two-layer at least; Interlamellar spacing between the then close two-layer demist pipe is 10mm～800mm; The caliber of demist pipe increases; Interlamellar spacing between the correspondingly close two-layer demist pipe also increases, and Sopwith staff is very little confirms that center distance between the demist pipe and interlamellar spacing are then confirmed according to the caliber of demist pipe to the caliber of demist pipe according to removing.In addition; Electric cleaner is a wet electrical dust precipitator; Comprise some dust collecting electrode 41 and be located at the some corona discharge electrodes 42 between the dust collecting electrode, be provided with the sparge pipe 43 that is connected with the outside network of rivers in the wet electrical dust precipitator upper end, as shown in Figure 3; Control of dust is honeycomb type very, also can adopt template dust collecting electrode as shown in Figure 4.The dust collecting electrode purge mode is the moisture film deashing.

With 2 * 300MW thermal power generation unit is example, and coal-fired sulfur content is 1.5%～2.8%, and the exhaust gas volumn that the separate unit unit produces is 120～150m ³/ h, SO ₂Content 3500～5500mg/Nm ³This flue gas is at first through the denitration of SCR technology, and with after dry electrostatic cleaner ESP or sack cleaner dedusting, the gas approach that from the utility model device, removes tower then gets into; Inlet temperature is 130 ℃～145 ℃; Entering at first is the desulfurization spraying layer after removing tower, and sulfur removal technology adopts the limestone-gypsum flue gas desulfurizing method, by the SO in the lime stone slurry absorption wash-out flue gas of three pull-up sulphur spraying layers spray ₂, and the PM in the wetting flue gas of while _2.5Deng pollutant, steam reaches capacity in the flue gas, and flue gas rises and gets into two-layer tubular type demister; The demist pipe adopts the PP material pipe of 50mm; In the tubular type demister, above bulky grain calcium plaster drop and the water droplet of 250 μ m in the flue gas effectively removed, flue gas also obtained humidity modified be uniformly distributed with; For follow-up wet electrical dust precipitator has alleviated load and optimized flue gas flow field, make wet electrical dust precipitator can efficiently remove granule gypsum drop and PM in the flue gas _2.5, wet electrical dust precipitator adopts honeycomb type, and the corona discharge electrode electrion makes gypsum drop, PM in the flue gas _2.5, heavy metal particles and SO ₃Pollutants such as aerosol are charged, and charged contaminant particles is deposited on the collecting plate under the effect of electric field force; Flow into the slurries pond with the moisture film of removing contamination then; The final discharge through the gypsum excavationg pump removes tower, and the pollutant in the flue gas is efficiently removed, and clean flue gas drains into chimney by exhanst gas outlet; In the outlet flue gas, PM _2.5≤20 μ g/Nm ³, Hg≤3 μ g/Nm ³, SO ₃Aerosol≤8 μ g/m ³, thoroughly solved " gypsum rain " problem of environment pollution caused.

Except that above-mentioned preferred embodiment; The utility model also has other embodiment; Those skilled in the art can make various changes and distortion according to the utility model, only otherwise break away from the spirit of the utility model, all should belong to the defined scope of the utility model accompanying claims.

Claims

1. a combined pollutant removes device; It is characterized in that: comprise removing tower (1); The bottom that removes tower is provided with gas approach (11); The top that removes tower is provided with exhanst gas outlet (12), in removing tower, between gas approach and exhanst gas outlet, is provided with desulfurization spraying layer (2), tubular type demister (3) and electric cleaner (4) from bottom to up successively, is positioned at the gas approach below and also is provided with the slurries pond (13) that stores lime stone slurry.

2. a kind of combined pollutant according to claim 1 removes device, it is characterized in that: said desulfurization spraying layer comprises shower (21) and is located at some spray apertures of shower bottom.

3. a kind of combined pollutant according to claim 2 removes device, it is characterized in that: be provided with circulating pump (5) between said shower and the slurries pond and realize that lime stone slurry recycles.

4. a kind of combined pollutant according to claim 1 removes device, it is characterized in that: said tubular type demister comprises the stay pipe (32) of some demist pipes (31) that laterally arrange and supporting demist pipe, and the demist pipe is provided with one deck at least.

5. a kind of combined pollutant according to claim 4 removes device, it is characterized in that: the caliber of said demist pipe is 5mm～300mm, and the center distance of close in twos demist pipe is 10mm～800mm.

6. remove device according to claim 4 or 5 described a kind of combined pollutants, it is characterized in that: said demist pipe is provided with two-layer at least, and the interlamellar spacing between the close two-layer demist pipe is 10mm～800mm.

7. a kind of combined pollutant according to claim 1 removes device; It is characterized in that: said electric cleaner is a wet electrical dust precipitator; Comprise some dust collecting electrode (41) and be located at the some corona discharge electrodes (42) between the dust collecting electrode, be provided with the sparge pipe (43) that is connected with the outside network of rivers in the wet electrical dust precipitator upper end.

8. a kind of combined pollutant according to claim 7 removes device, it is characterized in that: said control of dust is honeycomb type very.

9. a kind of combined pollutant according to claim 7 removes device, it is characterized in that: said control of dust is template very.