CN103977697B - A kind of box flue gas purification system - Google Patents

A kind of box flue gas purification system Download PDF

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Publication number
CN103977697B
CN103977697B CN201410211166.8A CN201410211166A CN103977697B CN 103977697 B CN103977697 B CN 103977697B CN 201410211166 A CN201410211166 A CN 201410211166A CN 103977697 B CN103977697 B CN 103977697B
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flue gas
respiratory box
except
nox
liquid phase
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CN103977697A (en
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陶俊
陶陶
徐继红
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Anhui Evelyn Environmental Engineering Co. Ltd.
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Huainan City's Bright Moon Environmental Protection Science And Technology Ltd Co
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A kind of box flue gas purification system, belongs to fume treatment and technical field of environmental equipment.Being one is with alkaline absorbent, absorbs SO in flue gas in respiratory box2And NOx, according to alkaline absorbent Dynamic Absorption and the principle of parsing NOx, constructing a resolution gas body space separated with flue gas, the NOx then resolved is sent to NOx recovery system and reclaims, liquid phase scrubbing SO in respiratory box2After product be mainly sulphite, directly send absorption system and leave the bigger system utilizing space;The invention has the beneficial effects as follows: NOx recovery system is independent, obtain pure containing nitre product;Sulphite recovery system obtains purer sulfur-bearing product, has relatively high product and is worth;Implementation result: desulfurization degree >=99%, denitration rate >=90%, the NOx response rate >=90%.

Description

A kind of box flue gas purification system
Technical field
The application belongs to fume treatment and technical field of environmental equipment.The present invention relates to a kind of box flue gas purification system, more specifically Ground is said, being one is with alkaline absorbent, absorbs SO in flue gas in respiratory box2And NOx, according to alkaline absorbent Dynamic Absorption With the principle of parsing NOx, constructing a resolution gas body space separated with flue gas, the NOx then resolved is sent to NOx and reclaims System reclaims, liquid phase scrubbing SO in respiratory box2After product be mainly sulphite, directly send absorption system and stay bigger Utilize the system in space.
Background technology
Current flue gas desulfurization and denitrification mainly uses " wet flue gas desulfurization (Wet-FGD) and NH3SCR (SCR) skill Art denitration ", the removing to sulfureous in flue gas, nitrogen pollutant is to carry out respectively in different devices and flow process, takies a large amount of sky Between, consuming ammonia, by-product gypsum is worth low, and investment is big, and operating cost is high.The existence of these problems, restricts this method in China Popularization and application.It would therefore be highly desirable to research and development are unified in same technological process the high-efficiency desulfurization denitration technology carried out, the most not Consume ammonia and technique and the equipment of NOx can be reclaimed.
In prior art, utility model patent ZL201020642632.5 discloses a kind of smoke purifier, and it relates to ring Border equipment technical field, its upper end, absorption tower is provided with exhaust outlet, and the lower end of exhaust outlet is provided with except fog chamber, except fog chamber lower end Being provided with netted deflector, the lower end of netted deflector is provided with vaporific nozzle, is provided with absorbing liquid bottom absorption tower;Absorption tower Lower end side be provided with air inlet, be provided with note ammonia point bottom absorption tower, note ammonia point upper end is provided be connected internal with absorption tower Absorption fluid supply pump, absorb fluid supply pump be connected with drying-granulating system, vaporific nozzle and netted deflector respectively.This practicality Novel by (NH4)2SO3Solution carries out deep oxidation, and relative to tradition ammonia process, energy consumption decreases, and clean-up effect is preferable, but It is only desulfurization, does not possess the function of denitration.
Patent CN 202620999 U discloses a kind of desulfurization and denitrification integral flue gas purification system, defeated including interconnective flue gas Enter system, smoke absorption cleaning system and neat stress exhaust system, wherein, also include being connected with described flue gas input system Concentration systems that flue gas oxidative system is connected with flue gas input system and the serosity processing system being connected with described concentration systems, The serosity oxidative system being connected with smoke absorption cleaning system and absorbent induction system.This utility model realizes the desulfurization of flue gas Denitrification integral, and made full use of late-stage products, but system complex, be particularly low to flue gas direct oxidation mode Effect, the oxidation to liquid phase sulfite potassium takes tradition aerating oxidation mode, is also poor efficiency.
Summary of the invention
Combine desulphurization denitration for Wet-FGD+SCR and invest big, operating cost height, the higher ammonia of value, by-product value need to be consumed Low shortcoming, the application proposes a kind of box flue gas purification system, and this system is reasonable in design, reaches dedusting, simultaneous SO_2 and NO removal And reclaiming the purpose of NOx, system investments is few, stable and reliable operation, resources and energy consumption are few, and by-product is worth height.
A kind of box flue gas purification system, is with alkaline absorbent, absorbs SO in flue gas in respiratory box2And NOx, according to alkalescence Absorbent Dynamic Absorption and the principle of parsing NOx, construct a resolution gas body space separated with flue gas, the NOx then resolved It is sent to NOx recovery system reclaim, liquid phase scrubbing SO in respiratory box2After product be mainly sulphite, directly send absorption system Unite and leave the bigger system utilizing space;Including interconnective flue gas input system, smoke absorption system, flue gas except mist System and purifying smoke output system, also include the slurry spraying system being connected with described smoke absorption system, also include and slurry NOx recovery system that liquid spray system is connected and the recovery system of sulphite.
Described flue gas input system by inputting flue, flue aerator forms;
Described smoke absorption system is formed by combining respiratory box, and described respiratory box top is provided with serosity spray thrower, and bottom is provided with Dividing plate, liquid-droping groove, liquid phase region, dividing plate, downspout, liquid phase region and respiratory box cylinder wall are collectively forming air pocket;Described liquid phase District is provided with weir;Described combination respiratory box, each respiratory box is mutually butted, and forms the exhaust gases passes district of UNICOM, resolves gas passage District and liquid phase region;Lower end, described the 1st respiratory box liquid phase region of combination respiratory box is provided with underflow collecting tank;
Described flue gas demister system is formed by except fog chamber, described is provided with one-level except mist layer and two grades are except mist layer except fog chamber, and described one Level rinses water layer except mist layer except being provided with one-level before and after mist layer, and described two grades are rinsed water layer except mist layer except being provided with two grades before mist layer; Except fog chamber bottom is provided with alkali liquor charging aperture and liquid phase region;
Described purifying smoke output system is made up of chimney;
Described slurry spraying system is made up of serosity spray thrower in slurry circulating pump, case;
Described NOx recovery system is by the air pocket in respiratory box, oxygen mixer, oxidation pipeline aerator, NO2Absorption tower and NO2 Absorbent circulating pump forms;
Described sulphite recovery system is made up of underflow liquid pump, filter, filtrate receiver and output of products pump.
Application the application one box flue gas purification system, comprises the following steps:
(1) flue gas input
Flue gas, by inputting flue input, sends into absorption system through flue blower;
(2) absorption of flue gas
Respiratory box gas approach is sent into, by serosity spray thrower spray-absorption in respiratory box, through multistage through flue blower The absorption of series connection respiratory box, the dust in flue gas, SO2Absorbed with NOx, then sent except fog chamber except mist purifies;
(3) flue gas is except mist purification
Flue gas after desulphurization denitration is sent into except fog chamber gas approach, sequentially pass through in except fog chamber one-level except flushing water layer before mist layer, One-level except mist layer, one-level except mist layer afterflush water layer, two grades rinse water layer and two grades except mist layer, smoke-purifying pneumatic transmission flue gas except mist layer Emptying;
(4) emptying of flue gas
After flue gas is except mist, purifying smoke is emptied by chimney;
(5) circulation of serosity
Dust, SO is absorbed in respiratory box2With the serosity of NOx, enter the lower space of respiratory box, empty in the bottom of respiratory box Between liquid phase region there is the analytic function of NOx;Be provided with weir in respiratory box liquid phase region, maintain certain liquid level, overflow slurry by The serosity spray thrower spray of serum recycle pumping respiratory box upper space, it is achieved the circulation of serosity;
(6) NOx recycles
The parsing gas that air pocket in respiratory box is collected, after mixing in oxygen mixer with oxygen, is added by oxidation pipeline aerator Force feed NO2Absorption tower, NO2In absorption tower, liquid phase is by NO2Absorbent circulating pump realizes circulation;NO2Absorbent is directly added into NO2Absorb Tower, the product containing nitre is at NO2System output is left on absorbent circulating pump branch road;NO2Absorb tower top to be connected with oxygen mixer, not The gas that reacting gas and absorption reaction generate all is routed directly to oxygen mixer, then is realized NOx by oxidation pipeline blower The circulation of oxidative absorption;
(7) recovery of sulphite product
The lower end, lower liquid phase district of the 1st respiratory box of combination respiratory box is provided with underflow collecting tank, collects in underflow collecting tank Underflow liquid filtered by underflow liquid pump delivery of filtered machine, filter solid phase for useless solid discharge;Filter liquid phase and be mainly sulphite, by Filtrate receiver is collected, sulfur-bearing output of products pump export.
Described step (1) (2) (3) (4) is the path of flue gas, the dust in flue gas, SO2Absorbed in step (2) with NOx, Empty except mist, purifying smoke through step (3) again.
In described step (2), flue gas dust in respiratory box, flue gas, SO2Absorbed with NOx, in step (2) is carried out, Needing the regeneration cycle of step (5) serosity, ensured continuous absorption power, plural serial stage has ensured final assimilation effect;
In described step (5), the circulation of serosity is constantly that step (6) provides the NOx reclaimed, and step (6) makes again serosity obtain again Raw, ensure continuous absorption power;Described step (7) constantly removes product, and in step (3), alkali liquor is continuously added to offer Absorption raw material.
Described step (3) is removed except mist layer flushing water is collected in except mist layer flushing water and one-level except two grades in fog chamber by fresh water (FW) pumping Fog chamber lower liquid phase district;The alkali liquor added except fog chamber bottom is diluted except fog chamber lower liquid phase district fresh water (FW), then is sent to step (2) Rear stage respiratory box, then at the liquid phase region flow forward of UNICOM;In respiratory box, flue-gas temperature is lowered, moisture in liquid phase Part evaporation is carried over absorption system, and the moisture that absorption system requires supplementation with is added except fog chamber by fresh water (FW), it is achieved the balance of water.
The filtrate receiver upper space of described step (7) also oxygen mixer with step (6) is connected, and the gas that filtrate resolves is the most sharp With.
The above alkaline absorbent is in sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate A kind of or compounding.
The application be embodied in following some:
(1) this system is reasonable in design, reaches dedusting, simultaneous SO_2 and NO removal and reclaims the purpose of NOx, and system investments is few, operation is steady The most reliably, resources and energy consumption is few.
(2) respiratory box top is provided with serosity spray thrower, and bottom is provided with dividing plate, liquid-droping groove, liquid phase region, dividing plate, downspout, Liquid phase region and respiratory box cylinder wall are collectively forming air pocket to collect the NOx gas of absorbing liquid Dynamic Absorption;In respiratory box liquid phase region Being provided with weir, maintain certain liquid level, overflow slurry is sprayed by the serosity spray thrower of serum recycle pumping respiratory box upper space, Realize the circulation of serosity;Each respiratory box is mutually butted, and forms the exhaust gases passes district of UNICOM, resolves gas channel region and liquid phase region.
(3) alkali liquor is inputted afterbody respiratory box, then at the liquid phase region flow forward of UNICOM, with smoke movement side by except fog chamber To on the contrary, form the effect of overall counter-current absorption.
(4) NOx recovery system is independent, obtains pure containing nitre product;Sulphite recovery system obtains purer sulfur-bearing and produces Product, have relatively high product and are worth.
(5) implementation result, desulfurization degree >=99%, denitration rate >=90%, the NOx response rate >=90%.
Accompanying drawing explanation
Accompanying drawing 1 is front view structure and the gas cleaning partial schematic diagram of the application a kind of box flue gas purification system respiratory box
Accompanying drawing 2 is side view structure and the by-product recovery section schematic diagram of the application a kind of box flue gas purification system respiratory box
In Fig. 1,1-inputs flue, 2-flue aerator, 3-respiratory box, and 4-removes fog chamber, and 5-one-level is except mist layer, 6-one-level are except mist Layer rinses water layer, 7-bis-grades removes mist layer and rinses water layer, and 8-bis-grades removes mist layer, 9-chimney, and 10-removes fog chamber liquid phase region, 11-alkali liquor Pump;A-flue gas, B-purifying smoke, C-fresh water (FW), D-alkali liquor.
3-respiratory box in Fig. 2,12-underflow liquid pump, 13-filter, 14-filtrate receiver, 15-sulfur-bearing output of products pump, 16- Serosity spray thrower, 17-dividing plate, 18-downspout, the dense slurry collecting groove of 19-, 20-liquid phase region, 21-air pocket, 22-oxygen mix Device, 23-aoxidizes pipeline aerator, 24-NO2Absorption tower, 25-NO2Absorbent circulating pump, 26-slurry circulating pump, 27-weir;E-NO2 Absorbent, F-product on nitre, G-oxygen, H-sulfur-bearing product, I-is useless solid.
Detailed description of the invention
Embodiment 1
Such as the front view structure of Fig. 1 respiratory box and the side view structure of gas cleaning part and Fig. 2 respiratory box and by-product recovery section Shown in, a kind of box flue gas purification system, it is with alkaline absorbent, respiratory box absorbs SO in flue gas2And NOx, according to alkali Property absorbent Dynamic Absorption and resolve NOx principle, construct a resolution gas body space separated with flue gas, the NOx then resolved It is sent to NOx recovery system reclaim, liquid phase scrubbing SO in respiratory box2After product be mainly sulphite, directly send absorption system Unite and leave the bigger system utilizing space;Including interconnective flue gas input system, smoke absorption system, flue gas except mist System and purifying smoke output system, also include the slurry spraying system being connected with described smoke absorption system, also include and slurry NOx recovery system that liquid spray system is connected and the recovery system of sulphite;
Described flue gas A input system by inputting flue 1, flue aerator 2 forms;
Described smoke absorption system is formed by combining respiratory box, and described respiratory box 3 top is provided with serosity spray thrower 16, and bottom sets It is equipped with dividing plate 17, liquid-droping groove 18, liquid phase region 20, dividing plate 17, downspout 18, liquid phase region 20 and respiratory box 3 cylinder wall It is collectively forming air pocket 21;Described liquid phase region is provided with weir 27;Described combination respiratory box, each respiratory box 3 is mutually butted, and forms connection Logical exhaust gases passes district, parsing gas channel region and liquid phase region;Lower end, the 1st respiratory box 3 liquid phase region 20 of described combination respiratory box It is provided with underflow collecting tank 19;
Described flue gas demister system is formed by except fog chamber 4, described is provided with one-level except mist layer 5 and two grades are except mist layer 8 except fog chamber 4, Described one-level rinses water layer 6 except mist layer except being provided with one-level before and after mist layer 5, described two grades except being provided with two grades before mist layer except mist layer Rinse water layer 7;Except fog chamber 4 bottom is provided with alkali liquor charging aperture and except fog chamber liquid phase region 10;
Described purifying smoke B output system is made up of chimney 9;
Described slurry spraying system is made up of serosity spray thrower 16 in slurry circulating pump 26, case;
Described NOx recovery system is by the air pocket 21 in respiratory box 3, oxygen mixer 22, oxidation pipeline aerator 23, NO2Inhale Receive tower 24 and NO2Absorbent circulating pump 25 forms;
Described sulphite recovery system is made up of underflow liquid pump 12, filter 13, filtrate receiver 14 and sulfur-bearing output of products pump 15;
Application the application one box flue gas purification system, comprises the following steps:
(1) flue gas input
Flue gas A is inputted by inputting flue 1, sends into absorption system through flue aerator 2 supercharging;
(2) absorption of flue gas
Respiratory box 3 gas approach is sent into through flue aerator 2 supercharging, by serosity spray thrower 16 spray-absorption in respiratory box 3, Through the absorption of plural serial stage respiratory box 3, the dust in flue gas, SO2Absorbed with NOx, then sent except fog chamber 4 except mist purifies;
(3) flue gas is except mist purification
Flue gas after desulphurization denitration is sent into except fog chamber 4 gas approach, sequentially passes through one-level except flushing water before mist layer in except fog chamber 4 Layer, one-level rinse water layer 7 and two grade except mist layer 8 except mist layer afterflush water layer 6, two grades except mist layer except mist layer 5, one-level, purify Flue gas B send the emptying of flue gas;
(4) emptying of flue gas
After flue gas is except mist, purifying smoke B is emptied by chimney 9;
(5) circulation of serosity
Dust, SO is absorbed in respiratory box 32With the serosity of NOx, enter the lower space of respiratory box 8, at respiratory box 3 There is the analytic function of NOx in lower space liquid phase region 20;It is provided with weir 27 in respiratory box liquid phase region 20, maintains certain liquid level high Degree, overflow slurry is sent the serosity spray thrower 16 of respiratory box upper space to spray by slurry circulating pump 26, it is achieved the circulation of serosity;
(6) NOx recycles
The parsing gas that air pocket 21 in respiratory box 3 is collected, after mixing in oxygen mixer 22 with oxygen G, by oxidation tube Road aerator 23 adds force feed NO2Absorption tower 24, NO2In absorption tower 24, liquid phase is by NO2Absorbent circulating pump 25 realizes circulation;NO2 Absorbent E is directly added into NO2Absorption tower 24, the product F containing nitre is at NO2System output is left on absorbent circulating pump 25 branch road;NO2 Absorption tower 24 is pushed up and is connected with oxygen mixer 22, and the gas that unreacting gas and absorption reaction generate all is routed directly to oxygen mix Device 22, then realized, by oxidation pipeline aerator 23 supercharging, the circulation that NOX oxidation absorbs;
(7) recovery of sulphite product
The lower end, lower liquid phase district 20 of the 1st respiratory box 3 of combination respiratory box is provided with underflow collecting tank 19, collects in underflow The underflow liquid collected in groove 19 is filtered by underflow liquid pump 12 delivery of filtered machine 13, filters solid phase for useless solid I discharge;Filter liquid phase Predominantly sulphite, is collected by filtrate receiver 14, sulfur-bearing output of products pump 15 exports sulfur-bearing product H.
Taking four respiratory box tandem compounds, alkali liquor uses sodium carbonate, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.5%, denitration efficiency 93.5%, the NOx response rate 92.0%.
Embodiment 2
Such as the front view structure of Fig. 1 respiratory box and the side view structure of gas cleaning part and Fig. 2 respiratory box and by-product recovery section institute Showing, a kind of box flue gas purification system, its equipment is arranged with enforcement step with embodiment 1, except arranged below and step:
Alkali liquor uses sodium carbonate, and concentration is 20%, each respiratory box of addition in parallel.
Application the application box flue gas purification system, desulfuration efficiency 99.3%, denitration efficiency 93.0%, the NOx response rate 91.8%.
Embodiment 3
Such as the front view structure of Fig. 1 respiratory box and the side view structure of gas cleaning part and Fig. 2 respiratory box and by-product recovery section institute Showing, a kind of box flue gas purification system, its equipment is arranged with enforcement step with embodiment 1, except arranged below and step:
Taking four respiratory box tandem compounds, each respiratory box structure is with the 1st respiratory box, and liquid phase is not communicated with, by setting up pump from the 4th Individual respiratory box, step by step to the 1 case conveying, maintains each respiratory box liquid level;Alkali liquor uses sodium hydroxide, and concentration is 20%,.
Application the application box flue gas purification system, desulfuration efficiency 99.6%, denitration efficiency 93.7%, the NOx response rate 92.1%.
The invention has the beneficial effects as follows: (1) this system is reasonable in design, reach dedusting, simultaneous SO_2 and NO removal and reclaim the purpose of NOx, System investments is few, stable and reliable operation, resources and energy consumption are few;(2) it is provided with weir in respiratory box liquid phase region, maintains certain liquid level Highly;Each respiratory box is mutually butted, and forms the exhaust gases passes district of UNICOM, resolves gas channel region and liquid phase region;(3) alkali liquor Afterbody respiratory box is inputted by except fog chamber, then at the liquid phase region flow forward of UNICOM, in opposite direction with smoke movement, formed The effect of overall counter-current absorption;(4) NOx recovery system is independent, obtains pure containing nitre product;Sulphite recovery system obtains Take purer sulfur-bearing product, there is relatively high product and be worth;(5) implementation result, desulfurization degree >=99%, denitration rate >=90%, NOx The response rate >=90%.
The application is not limited to above-mentioned embodiment, and it is any obviously to above-mentioned embodiment that those skilled in the art are made Improve or change, all without beyond the design of the present invention and the protection domain of claims.

Claims (3)

1. a box flue gas purification system, it is characterised in that: being one is with alkaline absorbent, absorbs flue gas in respiratory box Middle SO2And NOx, according to alkaline absorbent Dynamic Absorption and the principle of parsing NOx, in respiratory box, construct one separate with flue gas Resolution gas body space, the NOx then resolved be sent to NOx recovery system reclaim, liquid phase scrubbing SO in respiratory box2After product Predominantly sulphite, directly sends absorption system and leaves the system in bigger value space;
System is exported, also including interconnective flue gas input system, smoke absorption system, flue gas demister system and purifying smoke Including the slurry spraying system being connected with described smoke absorption system, also include that the NOx being connected with slurry spraying system reclaims System and the recovery system of sulphite;
Described flue gas input system by inputting flue, flue aerator forms;
Described smoke absorption system is formed by combining respiratory box, and described respiratory box top is provided with serosity spray thrower, and bottom is provided with Dividing plate, liquid-droping groove, liquid phase region, dividing plate, downspout, liquid phase region and respiratory box cylinder wall are collectively forming air pocket;Described liquid phase District is provided with weir;Described combination respiratory box, each respiratory box is mutually butted, and forms the exhaust gases passes district of UNICOM, resolves gas passage District and liquid phase region;Lower end, described the 1st respiratory box liquid phase region of combination respiratory box is provided with underflow collecting tank;
Described flue gas demister system is formed by except fog chamber, described is provided with one-level except mist layer and two grades are except mist layer except fog chamber, and described one Level rinses water layer except mist layer except being provided with one-level before and after mist layer, and described two grades are rinsed water layer except mist layer except being provided with two grades before mist layer; Except fog chamber bottom is provided with alkali liquor charging aperture and liquid phase region;
Described purifying smoke output system is made up of chimney;
Described slurry spraying system is made up of serosity spray thrower in slurry circulating pump, case;
Described NOx recovery system is by the air pocket in respiratory box, oxygen mixer, oxidation pipeline aerator, NO2Absorption tower and NO2 Absorbent circulating pump forms;
Described sulphite recovery system is made up of underflow liquid pump, filter, filtrate receiver and output of products pump.
Box flue gas purification system the most according to claim 1, it is characterised in that: comprise the following steps:
(1) flue gas input
Flue gas, by inputting flue input, sends into absorption system through flue blower;
(2) absorption of flue gas
Respiratory box gas approach is sent into, by serosity spray thrower spray-absorption in respiratory box, through multistage through flue blower The absorption of series connection respiratory box, the dust in flue gas, SO2Absorbed with NOx, then sent except fog chamber except mist purifies;
(3) flue gas is except mist purification
Flue gas after desulphurization denitration is sent into except fog chamber gas approach, sequentially pass through in except fog chamber one-level except flushing water layer before mist layer, One-level except mist layer, one-level except mist layer afterflush water layer, two grades rinse water layer and two grades except mist layer, smoke-purifying pneumatic transmission flue gas except mist layer Emptying;
(4) emptying of flue gas
After flue gas is except mist, purifying smoke is emptied by chimney;
(5) circulation of serosity
Dust, SO is absorbed in respiratory box2With the serosity of NOx, enter the lower space of respiratory box, empty in the bottom of respiratory box Between liquid phase region there is the analytic function of NOx;Be provided with weir in respiratory box liquid phase region, maintain certain liquid level, overflow slurry by The serosity spray thrower spray of serum recycle pumping respiratory box upper space, it is achieved the circulation of serosity;
(6) NOx recycles
The parsing gas that air pocket in respiratory box is collected, after mixing in oxygen mixer with oxygen, is added by oxidation pipeline aerator Force feed NO2Absorption tower, NO2In absorption tower, liquid phase is by NO2Absorbent circulating pump realizes circulation;NO2Absorbent is directly added into NO2Absorb Tower, the product containing nitre is at NO2System output is left on absorbent circulating pump branch road;NO2Absorb tower top to be connected with oxygen mixer, not The gas that reacting gas and absorption reaction generate all is routed directly to oxygen mixer, then is realized NOx by oxidation pipeline blower The circulation of oxidative absorption;
(7) recovery of sulphite product
The lower end, lower liquid phase district of the 1st respiratory box of combination respiratory box is provided with underflow collecting tank, collects in underflow collecting tank Underflow liquid filtered by underflow liquid pump delivery of filtered machine, filter solid phase for useless solid discharge;Filter liquid phase and be mainly sulphite, by Filtrate receiver is collected, sulfur-bearing output of products pump export.
Box flue gas purification system the most according to claim 2, it is characterised in that: described step (3) is pumped by fresh water (FW) It is collected in except fog chamber lower liquid phase district except two grades in fog chamber remove mist floor flushing water except mist floor flushing water and one-level;Except fog chamber bottom adds The alkali liquor entered is diluted except fog chamber lower liquid phase district fresh water (FW), then is sent to step (2) afterbody respiratory box, then in UNICOM Liquid phase region flow forward;In respiratory box, flue-gas temperature is lowered, and in liquid phase, moist part evaporation is carried over absorption system, inhales The moisture that receipts system requires supplementation with is added except fog chamber by fresh water (FW), it is achieved the balance of water.
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CN104492228A (en) * 2014-12-17 2015-04-08 安徽理工大学 System for extracting sulfur dioxide in dense smoke
CN105771579B (en) * 2016-04-20 2018-06-29 北京中能诺泰节能环保技术有限责任公司 Flue gas purification system

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JP2003176713A (en) * 2001-12-11 2003-06-27 Daihatsu Diesel Mfg Co Ltd Exhaust gas treating equipment
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CN102512927B (en) * 2011-12-31 2014-03-12 田鹏程 Integrated flue gas desulfurizing and denitrating purification system and purification technology for same

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