CN104548918B - The technique and system of particle content after a kind of reduction flue gas desulfurization - Google Patents
The technique and system of particle content after a kind of reduction flue gas desulfurization Download PDFInfo
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- CN104548918B CN104548918B CN201510018433.4A CN201510018433A CN104548918B CN 104548918 B CN104548918 B CN 104548918B CN 201510018433 A CN201510018433 A CN 201510018433A CN 104548918 B CN104548918 B CN 104548918B
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Abstract
The invention provides it is a kind of reduce flue gas desulfurization after particle content technique and system, including desulfurizing tower and the second slurry pool, desulfurization tower bottom is provided with the first slurry pool, desulfurizing tower bottom offers smoke inlet, be located in desulfurizing tower above smoke inlet is desulphurization stage, desulphurization stage is divided at least two sections, is first connected first slurry pool by the circulating pump of first paragraph with the leading portion desulphurization stage of smoke contacts, and final stage desulphurization stage connects the second slurry pool by the circulating pump of second segment；The first demister is provided with above desulphurization stage, the first demister is connected with spraying section, and spraying section connects the second demister, and the second demister top arranges exhanst gas outlet；Also include the 3rd slurry pool, the 3rd slurry pool is connected with spraying section by the 3rd circulating pump.Simple structure of the present invention, either grassroot project or old project reconstruction, all without excessive increase engineering cost；The fine particulates content in discharge flue gas can be significantly reduced, so as to avoid pollution of the desulphurization system to surrounding enviroment.
Description
Technical field
The invention belongs to atmosphere pollution administers field, more particularly to a kind of cigarette that can reduce wet desulfurization system discharge
The technique and system of particle content in gas.
Background technology
Wet desulphurization is that current technology is most ripe, most widely used flue gas desulfurization technique, wherein limestone/lime-stone
Cream Wet Flue Gas Desulfurization Technology accounts for the 85% or so of the FGD systems for putting into operation in the world, and China's overwhelming majority is large-scale coal-fired
The desulfurization method of group of motors is all limestone/lime-gypsum wet flue gas desulfurizing, and desulfuration efficiency is typically up to more than 95%.
As the development of China's economy and society, smoke discharge amount are in continuous ascendant trend, the environmental problem for causing is increasingly
It is prominent, in order to preserve the ecological environment and people health, corresponding pollutant catabolic gene standard constantly improves, in recent years, I
Every pollutant emission limit that state carries out has reduction by a relatively large margin.
In order to qualified discharge, for existing wet desulfurization system, most direct solution is exactly to increase
The liquid-gas ratio of desulfurization, and this means to have more droplets containing desulfurization slurry demister, existing folding can be entered with flue gas
Plate demister is very low for less than 20 μm of droplet demisting efficiency.A large amount of fine mists go out chimney by demister row, saturation
Flue gas containing desulfurization slurry droplet separates out condensed water with the reduction flue gas of temperature in discharge process, is formed with the droplet escaped
The rainfall of desulfurizer periphery, i.e. gypsum rain, sulphur ammonium aerosol etc., this can all cause certain harm to surrounding enviroment and equipment,
And cause granular material discharged exceeded, therefore, it is necessary to try to reduce the discharge of desulfurization fume particulate matter.
The content of the invention
It is an object of the invention to provide a kind of relatively simple, practical system for reducing particle content after flue gas desulfurization,
To solve the problems, such as desulphurization system outlet containing larger concentration of particles thing.
For achieving the above object, the present invention is employed the following technical solutions：
The system of particle content after a kind of reduction flue gas desulfurization, including desulfurizing tower and the second slurry pool, desulfurization tower bottom
The first slurry pool is provided with, it is desulphurization stage that desulfurizing tower bottom offers, and is taken off
Sulfur level is divided at least two sections, is first connected first slurry pool by the circulating pump of first paragraph with the leading portion desulphurization stage of smoke contacts, most
Latter section of desulphurization stage connects the second slurry pool by the circulating pump of second segment；It is provided with the first demister above desulphurization stage, first
Demister is connected with spraying section, and spraying section connects the second demister, and the second demister top arranges exhanst gas outlet；Also include the 3rd
Slurry pool, the 3rd slurry pool are connected with spraying section by the 3rd circulating pump.
Further, it is filled with desulfurizer slurry in first slurry pool, the second slurry pool, the second slurry pool is by the
One slurry pool takes liquid, is provided with particulate matter removing device between the two；3rd slurry pool is connected with device for smoke pollutants.
Further, the concentration of the serosity in first slurry pool, the second slurry pool, the 3rd slurry pool is reduced successively.
Further, the particulate matter removing device, device for smoke pollutants be filter, Sedimentation tank, defecator, waterpower
One or several combinations in the devices such as cyclone, stripping air stripping pond, neutralization pond.
Further, the spraying section and the second demister are arranged in whole desulfurizing tower in the lump with desulphurization stage.
Further, second demister is located above spraying section.
Further, the spraying section is provided with funnelform device for storing liquid, and the second slurry pool is located at outside desulfurizing tower, liquid storage dress
Put lower end and be provided with return duct, be communicated to the second slurry pool.
Further, the spraying section and the second demister are arranged on outside desulfurizing tower.
Further, second demister is arranged on the top of spraying section or the side of spraying section.
Further, the 3rd slurry pool is set below spraying section.
Further, second demister is arranged on the side of spraying section, has been arranged between baffle plate, baffle plate and the 3rd slurry
Set between liquid pool and leave exhaust gases passes.
It is a further object to provide it is a kind of reduce flue gas desulfurization after particle content technique, technical scheme is such as
Under：
The technique of particle content after a kind of reduction flue gas desulfurization, former flue gas enter desulfurizing tower, flue gas Jing from smoke inlet
Cross desulphurization stage and remove SO2, wherein desulphurization stage leading portion using the serosity of high concentration, containing being 5～35% admittedly, in back segment, adopt
Low concentration serosity, containing solid≤5%；Back segment low concentration droplet also traps the leading portion high concentration mist into back segment while desulfurization
Drop, makes into the particle concentration in the droplet of first demister to reduce；Under identical demisting efficiency, first demister
The particle concentration of outlet declines；Flue gas enters the first demister, after removing the desulfurization slurry droplet of greater particle size in flue gas, contains
The fine mist for having tiny particles content enters into spraying section with flue gas, by particle diameter is sprayed into in flue gas for tens of to hundreds of micro-
The cleaning droplet of rice, to catch the fine mist in flue gas and fine particulates, the flue gas after spraying purification is entered into
Second demister, discharges after further removing the fine particulates in flue gas.
Further, in the first demister removal flue gas, the particle diameter of the desulfurization slurry droplet of greater particle size is micro- more than 10～20
Rice；Spraying section catches the particle diameter of the fine particulates in flue gas and is less than 20 microns.
Further, it is fresh water (FW) in the 3rd slurry pool, activating agent, flocculant can be added with, wherein trickle
Grain thing content is less than 5%.
The present invention principle be：As the demisting efficiency of existing demister is limited, especially it is difficult to remove particle diameter less than 10
The fine particulates of micron, therefore the small particle droplet meeting entrainment portions particulate matter by escaping in the flue gas after demister,
Desulphurization stage is divided into at least two sections for this, desulfurizer slurry of the back segment using lower concentration, while increase at least a section and spraying-removing
Mist system, the droplet that tens of to hundreds of microns are sprayed in flue gas catch nanometer, micron-sized fine particulates, due to what is sprayed into
Much larger than the particulate matter being captured, when droplet is contacted with particulate matter, particulate matter is just easily caught mist droplet particle size by droplet；Spray
Mist section so particle content is lower in the droplet that carries after section of spraying of flue gas, then is passed through using the serosity that more cleans
Second demister, big droplet are easily removed by demister, are discharged the fine particulates content in flue gas and are obtained significantly
Reduction.
The invention has the beneficial effects as follows：1) system simple structure, either grassroot project or old project reconstruction, all without
Excessive increase engineering cost；2) the fine particulates content in discharge flue gas can be significantly reduced, so as to avoid desulphurization system
Pollution to surrounding enviroment.
Description of the drawings
Structural representations of the Fig. 1 for the embodiment of the present invention 1；
Structural representations of the Fig. 2 for the embodiment of the present invention 2；
Structural representations of the Fig. 3 for the embodiment of the present invention 3.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described further.
The system of particle content after a kind of reduction flue gas desulfurization, including desulfurizing tower and the second slurry pool, desulfurization tower bottom
The first slurry pool is provided with, it is desulphurization stage that desulfurizing tower bottom offers, and is taken off
Sulfur level is divided at least two sections, is first connected first slurry pool by first circulation pump with the leading portion desulphurization stage of smoke contacts, last
Section desulphurization stage connects the second slurry pool by second circulation pump；The first demister is provided with above desulphurization stage, the first demister connects
Spraying section is connected to, spraying section connects the second demister, and the second demister top arranges exhanst gas outlet；Also include the 3rd slurry pool,
3rd slurry pool is connected with spraying section by the 3rd circulating pump.
Embodiment 1
Such as Fig. 1, desulfurization method of limestone-gypsum system, including desulfurizing tower 10,10 bottom of desulfurizing tower is provided with the first slurry pool
101,10 bottom of desulfurizing tower offers smoke inlet 108, and it is desulphurization stage 102 to be located in desulfurizing tower 10 above smoke inlet 1087,
102 points of desulphurization stage is at least two sections, and the first paragraph (the first leading portion desulphurization stage with smoke contacts) of desulphurization stage 102 is by first paragraph
Circulating pump 114 connects the first slurry pool 101, and 102 final stage of desulphurization stage connects the second serosity by the circulating pump 115 of second segment
Pond 110；The first demister 103 is provided with above desulphurization stage 102, the first demister 103 is connected with spraying section 104, section 104 of spraying
Connect the second demister 105,105 top of the second demister arranges exhanst gas outlet 106；Also include the 3rd slurry pool 111, the 3rd slurry
Liquid pool 111 is connected with spraying section by the 3rd circulating pump 116.
3rd slurry pool 111 is connected with device for smoke pollutants 112, and device for smoke pollutants 112 connects the first slurry pool
101；Spraying section 104 is provided with funnelform device for storing liquid 113, and the second slurry pool 110 and the 3rd slurry pool 111 are located at desulfurizing tower 10
Outward, 113 lower end of device for storing liquid is provided with return duct 107, is communicated to the 3rd slurry pool 111.
Desulfurizer slurry is filled with first slurry pool 101, the second slurry pool 110, the second slurry pool 110 is by the first slurry
Liquid pool 101 takes liquid, is provided with particulate matter removing device 109 between the two, and particulate matter removing device 109 adopts hydrocyclone；The
Three slurry pools 111 are connected with device for smoke pollutants, and device for smoke pollutants 112 adopts filter.
The concentration of the serosity in the first slurry pool 101, the second slurry pool 110, the 3rd slurry pool 111 is reduced successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 10 from smoke inlet 108, in desulphurization stage 102, cigarette
SO in gas2React with desulfurization slurry and be removed, wherein desulfurization section leading portion using high concentration serosity, containing admittedly for 5～
35%, in back segment, using low concentration serosity, containing solid≤5%, back segment low concentration droplet is also trapped while desulfurization and enters back segment
Leading portion high concentration droplet, make in the droplet of first demister particle concentration reduce；Flue gas continues up, carries
The first demister 103 is entered containing desulfurization slurry droplet in a large number, 103 efficiency of the first demister is more than 90%, to remove particle diameter
Based on droplet more than or equal to 10～20 microns, mainly contain in the flue gas after first time demisting escape containing Gypsum Fibrosum
Droplet, also including the fine particulates including part agstone serosity, flyash, by the sprinkling of section 104 relatively cleaning of spraying
Droplet is removed, and the droplet of sprinkling is collected and is back in the 3rd slurry pool 111 by device for storing liquid 113, and the 3rd slurry pool 111 leads to
Cross the 3rd circulating pump 116 to continue to provide spray water to spraying section 104；Meanwhile, the connection device for smoke pollutants of the 3rd slurry pool 111
112, the particulate matter in serosity to be discharged in time, desulfurizing tower 10 is discharged or entered to filtrate as system water supplement.3rd slurry pool
111 carry out moisturizing by external technique water pipe.The second demister 105 is advanced on the flue gas for spraying section, spraying section is removed
After a large amount of droplets for producing, neat stress now still contains a small amount of fine mist by 106 discharge system of exhanst gas outlet in flue gas, but
It is that the desulfurizing agent that contains in droplet and fume amount are controlled, the pollution after can avoiding discharging to surrounding.
Embodiment 2
Such as Fig. 2, limestone-gypsum desulphurization system, including desulfurizing tower 20,20 bottom of desulfurizing tower is provided with the first slurry pool
201,20 bottom of desulfurizing tower offers smoke inlet 208, and it is desulphurization stage 202 to be located in desulfurizing tower 20 above smoke inlet 208, is taken off
202 points of sulfur level is at least two sections, first paragraph (the first leading portion desulphurization stage with smoke contacts) the following by first paragraph of desulphurization stage 202
Ring pump 214 connects the first slurry pool 201, and 202 final stage of desulphurization stage connects the second slurry pool by the circulating pump 215 of second segment
210；The first demister 203 is provided with above desulphurization stage 202, the first demister 203 is connected with spraying section 204, and spraying section 204 connects
The second demister 205 is connect, spraying section 204 and the second demister 205 are located at outside desulfurizing tower 20, and the second demister 205 is located at spraying
Above section 204, exhanst gas outlet 206 is set at the top of second demister 205；The 3rd slurry pool 211 is connected with below spraying section 204,
3rd slurry pool 211 is connected with spraying section 204 by the 3rd circulating pump 216；3rd slurry pool 211 is connected with pollutant removing dress
212 are put, device for smoke pollutants 212 connects the first slurry pool 201.
Desulfurizer slurry is filled with first slurry pool 201, the second slurry pool 210, the second slurry pool 210 is by the first slurry
Liquid pool 201 takes liquid, is provided with particulate matter removing device 209 between the two, and particulate matter removing device 209 adopts hydrocyclone；The
Three slurry pools are connected with device for smoke pollutants, and pollutant removing 212 is filter.
The concentration of the serosity in the first slurry pool 201, the second slurry pool 210, the 3rd slurry pool 211 is reduced successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 20 from smoke inlet 208, in desulphurization stage 202, cigarette
SO in gas2React with desulfurization slurry and be removed, wherein desulfurization section leading portion using high concentration serosity, containing admittedly for 5～
35%, in back segment, using low concentration serosity, containing solid≤5%, back segment low concentration droplet is also trapped while desulfurization and enters back segment
Leading portion high concentration droplet, make in the droplet of first demister particle concentration reduce；Flue gas continues up, carries
The first demister 203 is entered containing desulfurization slurry droplet in a large number, 203 efficiency of the first demister is more than 90%, to remove particle diameter
Based on droplet more than or equal to 10～20 microns, mainly contain in the flue gas after first time demisting escape containing Gypsum Fibrosum
Droplet, also including the fine particulates including part agstone serosity, flyash, by the sprinkling of section 204 relatively cleaning of spraying
Droplet is removed, and the droplet of sprinkling is fallen directly in the 3rd slurry pool 211, and the 3rd slurry pool 211 passes through the 3rd circulating pump 216
Continue to provide spray water to spraying section 204；Meanwhile, the connection device for smoke pollutants 212 of the 3rd slurry pool 211, by serosity
Particulate matter is discharged in time, and filtrate enters desulfurizing tower 20 as system water supplement.3rd slurry pool 211 is carried out by external technique water pipe
Moisturizing.The second demister 205 is advanced on the flue gas for spraying section, after removing a large amount of droplets that spraying section is produced, neat stress
By 206 discharge system of exhanst gas outlet, now in flue gas, still contain a small amount of fine mist, but the desulfurizing agent contained in droplet and cigarette
Dust quantity is controlled, the pollution after can avoiding discharging to surrounding.
Embodiment 3
Such as Fig. 3, limestone-gypsum desulphurization system, including desulfurizing tower 30,30 bottom of desulfurizing tower is provided with the first slurry pool
301,30 bottom of desulfurizing tower offers smoke inlet 307, and it is desulphurization stage 302 to be located in desulfurizing tower 30 above smoke inlet 307, is taken off
302 points of sulfur level is at least two sections, first paragraph (the first leading portion desulphurization stage with smoke contacts) the following by first paragraph of desulphurization stage 302
Ring pump 314 connects the first slurry pool 301, and 302 final stage of desulphurization stage connects the second slurry pool by the circulating pump 315 of second segment
310；The first demister 303 is provided with above desulphurization stage 302, the first demister 303 is connected with spraying section 304, and spraying section 304 connects
The second demister 305 is connect, spraying section 304 and the second demister 305 are located at outside desulfurizing tower 30, and the second demister 305 is located at spraying
304 sides of section, are provided with baffle plate 317 between the second demister 305 and spraying section 304, set between baffle plate 317 and the 3rd slurry pool
Leave exhaust gases passes 318；Exhanst gas outlet 306 is set at the top of second demister 305；The 3rd serosity is connected with below spraying section 304
Pond 311, the 3rd slurry pool 311 are connected with spraying section 304 by the 3rd circulating pump 316；3rd slurry pool 311 is connected with pollutant
Removing means 312, device for smoke pollutants 312 connect the first slurry pool 301.
Desulfurizer slurry is filled with first slurry pool 301, the second slurry pool 310, the second slurry pool 310 is by the first slurry
Liquid pool 301 takes liquid, is provided with particulate matter removing device 309 between the two, and particulate matter removing device 309 adopts hydrocyclone；The
Three slurry pools are connected with device for smoke pollutants, and device for smoke pollutants 312 is filter.
The concentration of the serosity in the first slurry pool 301, the second slurry pool 310, the 3rd slurry pool 311 is reduced successively.
Desulfurizing tower bottom is desulfurization slurry pond, and former flue gas enters desulfurizing tower 30 from smoke inlet 308, in desulphurization stage 302, cigarette
SO in gas2React with desulfurization slurry and be removed, wherein desulfurization section leading portion using high concentration serosity, containing admittedly for 5～
35%, in back segment, using low concentration serosity, containing solid≤5%, back segment low concentration droplet is also trapped while desulfurization and enters back segment
Leading portion high concentration droplet, make in the droplet of first demister particle concentration reduce；Flue gas continues up, carries
The first demister 303 is entered containing desulfurization slurry droplet in a large number, 303 efficiency of the first demister is more than 90%, to remove particle diameter
Based on droplet more than or equal to 10～20 microns, mainly contain in the flue gas after first time demisting escape containing Gypsum Fibrosum
Droplet, also including the fine particulates including part agstone serosity, flyash, by the sprinkling of section 304 relatively cleaning of spraying
Droplet is removed, and the droplet of sprinkling is directly dropped down onto in the 3rd slurry pool 311, and the 3rd slurry pool 311 passes through the 3rd circulating pump 316
Continue to provide spray water to spraying section 304；Meanwhile, the connection device for smoke pollutants 312 of the 3rd slurry pool 311, by serosity
Particulate matter is discharged in time, and desulfurizing tower 30 is discharged or entered to filtrate as system water supplement.3rd slurry pool 311 is by external technique
Water pipe carries out moisturizing.The second demister 305 is upwardly into after the flue gas of section of spraying is folded to down through passage 318, due to used
Property effect, at passage 318, partly the droplet containing particulate matter is removed into the 3rd slurry pool 311.Second demister 305
After removing the remaining part droplet of spraying section, neat stress is now still contained in flue gas a small amount of tiny by 306 discharge system of exhanst gas outlet
Droplet, but the desulfurizing agent and fume amount that contain in droplet are controlled, the pollution after can avoiding discharging to surrounding.
Claims (4)
1. it is a kind of reduce flue gas desulfurization after particle content system, it is characterised in that：Including desulfurizing tower, the second slurry pool and
Three slurry pools；
The desulfurization tower bottom is provided with the first slurry pool, and desulfurizing tower bottom offers
Entrance top is desulphurization stage, and desulphurization stage is divided at least two sections, first the circulation with the leading portion desulphurization stage of smoke contacts by first paragraph
Pump connects the first slurry pool, and final stage desulphurization stage connects the second slurry pool by the circulating pump of second segment；Set above desulphurization stage
The first demister is equipped with, the first demister is connected with spraying section, and spraying section connects the second demister, and the second demister top is arranged
Exhanst gas outlet；
The spraying section and the second demister are arranged on outside desulfurizing tower, and the 3rd slurry pool is arranged on the lower section of spraying section, and described the
Three slurry pools are connected with spraying section by the 3rd circulating pump, and second demister is arranged on the side of spraying section, is arranged between
There is baffle plate, set between baffle plate and the 3rd slurry pool and leave exhaust gases passes.
2. it is a kind of for system as claimed in claim 1 reduce flue gas desulfurization after particle content technique, it is characterised in that：
Former flue gas enters desulfurizing tower from smoke inlet, and flue gas removes SO through desulphurization stage2, wherein the leading portion in desulphurization stage adopts high concentration
Serosity, containing being 5～35% admittedly, in back segment, using low concentration serosity, containing solid≤5%；Back segment low concentration droplet is in the same of desulfurization
When also trap leading portion high concentration droplet into back segment, make into the particle concentration in the droplet of first demister to reduce；
Under identical demisting efficiency, the particle concentration of first demister outlet declines；Flue gas enters the first demister, removes smoke abatement
In gas after the desulfurization slurry droplet of greater particle size, the fine mist containing tiny particles content enters into spraying section with flue gas, passes through
The cleaning droplet that particle diameter is tens of to hundreds of microns is sprayed into in flue gas, to catch the fine mist in flue gas and fine particle
Thing, the flue gas after spraying purification enter into the second demister, discharge after further removing the fine particulates in flue gas.
3. the as claimed in claim 2 technique for reducing particle content after flue gas desulfurization, it is characterised in that：First demister goes
Except the particle diameter of the desulfurization slurry droplet of greater particle size in flue gas is more than 10～20 microns；Spraying section catches the fine particle in flue gas
The particle diameter of thing is less than 20 microns.
4. the as claimed in claim 3 technique for reducing particle content after flue gas desulfurization, it is characterised in that：3rd serosity
It is fresh water (FW) in pond, is added with activating agent, flocculant, wherein fine particulates content is less than 5%.
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| CN105056679B (en) * | 2015-08-11 | 2017-03-01 | 中国五环工程有限公司 | PM in process of wet desulphurization2.5Removal methods and its device |
| CN108211396A (en) * | 2018-03-12 | 2018-06-29 | 诺卫能源技术（北京）有限公司 | Configuration technique and device are detached using the evaporator indirect steam of leatherleaf isolation technics |
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| JP3068452B2 (en) * | 1996-02-06 | 2000-07-24 | 三菱重工業株式会社 | Wet flue gas desulfurization equipment |
| CN201664576U (en) * | 2010-08-16 | 2010-12-08 | 殷茵 | Apparatus for removing sulfur dioxide in flue gas by ammonia water |
| CN102872709A (en) * | 2012-09-17 | 2013-01-16 | 江苏和亿昌环保工程科技有限公司 | Process of efficiently capturing aerosol in desulfurized flue gas |
| CN203971739U (en) * | 2014-06-27 | 2014-12-03 | 山东索普节能科技有限公司 | Pneumatic emulsifying concentrated phase desulphurization system |
| CN204412061U (en) * | 2015-01-14 | 2015-06-24 | 江苏揽山环境科技有限公司 | A kind of system reducing particle content after flue gas desulfurization |
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