CN103977697A - Box-type flue gas purifying system - Google Patents

Box-type flue gas purifying system Download PDF

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Publication number
CN103977697A
CN103977697A CN201410211166.8A CN201410211166A CN103977697A CN 103977697 A CN103977697 A CN 103977697A CN 201410211166 A CN201410211166 A CN 201410211166A CN 103977697 A CN103977697 A CN 103977697A
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flue gas
box
nox
respiratory box
absorption
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CN201410211166.8A
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CN103977697B (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

The invention discloses a box-type flue gas purifying system, and belongs to the technical field of flue gas treatment and environment equipment. The box-type flue gas purifying system is characterized in that SO2 and NOx in flue gas are absorbed in an absorption box by alkaline absorbents; an analytical gas space which is separated away from flue gas is constructed according to a principle of dynamic absorption and NOx analysis by the alkaline absorbents; then the analyzed NOx is sent to a NOx recycling system for recycling; products generated after SO2 liquid phase absorption in the absorption box are mainly sulfite, and are directly sent out of an absorption system, and a large space utilization system is remained. The box-type flue gas purifying system provided by the invention has the beneficial effects that the NOx recycling system is independent, and purified nitre-contained products are obtained; a sulfite recycling system obtains purified sulfur-contained products, and has high product value; the implementation effect is that the desulfurization degree is greater than or equal to 99%, the denitrification rate is greater than or equal to 90%, and the NOx recycling rate is greater than or equal to 90%.

Description

A kind of box flue gas purification system
The application belongs to flue gas and processes and environmental unit technical field.The present invention relates to a kind of box flue gas purification system, more particularly, being one is with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to alkaline absorbent, dynamically absorb and resolve the principle of NOx, construct a resolution gas body space separating with flue gas, the NOx then resolving is sent to NOx recovery system and reclaims, and in respiratory box, liquid phase absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger system of utilizing space.
Background technology
That current flue gas desulfurization and denitrification mainly adopts is " wet flue gas desulfurization (Wet-FGD) and NH 3the denitration of SCR (SCR) technology ", to removing of sulfureous in flue gas, nitrogen pollutant, be to carry out respectively in different devices and flow process, take large quantity space, consume ammonia, by-product gypsum is worth low, and investment is large, and operating cost is high.The existence of these problems, restriction Gai Fa China applies.Therefore, urgently research and development are unified in the high-efficiency desulfurization denitration technology carrying out in same technological process, particularly do not consume ammonia and can reclaim technique and the equipment of NOx.
In prior art, utility model patent ZL201020642632.5 discloses a kind of smoke purifier, it relates to environmental unit technical field, its upper end, absorption tower is provided with exhaust outlet, the lower end of exhaust outlet is provided with except fog chamber, except fog chamber lower end is provided with netted deflector, the lower end of netted deflector is provided with vaporific nozzle, and bottom, absorption tower is provided with absorption liquid; The lower end side on absorption tower is provided with air inlet, and bottom, absorption tower is provided with note ammonia point, and note ammonia point upper end is provided with and the inner absorption liquid supply pump being connected in absorption tower, and absorption liquid supply pump is connected with drying-granulating system, vaporific nozzle and netted deflector respectively.This utility model is by (NH 4) 2sO 3solution carries out deep oxidation, and with respect to traditional ammonia process, energy consumption decreases, and clean-up effect is better, but is only desulfurization, does not possess the function of denitration.
Patent CN202620999U discloses a kind of desulfurization and denitrification integral flue gas purification system, comprise interconnective flue gas input system, smoke absorption cleaning system and clean flue gas emission, wherein, also comprise the flue gas oxidative system being connected with described flue gas input system, the concentration systems being connected with flue gas input system and the slurries treatment system being connected with described concentration systems, the slurries oxidative system being connected with smoke absorption cleaning system and absorbent induction system.This utility model realizes the desulfurization and denitrification integral of flue gas, and later stage product is made full use of, but system complex is particularly poor efficiency to flue gas direct oxidation mode, the oxidation of potassium sulfite in liquid phase has been taked to traditional aeration mode of oxidizing, is also poor efficiency.
Summary of the invention
Large for the investment of Wet-FGD+SCR combination desulphurization denitration, operating cost is high, need to consume higher ammonia, the by-product of value and be worth low shortcoming, the application proposes a kind of box flue gas purification system, this system is reasonable, reach dedusting, desulphurization denitration reclaim the object of NOx simultaneously, system small investment, stable and reliable operation, resources and energy consumption are few, and by-product is worth high.
A box flue gas purification system, is with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to alkaline absorbent, dynamically absorb and resolve the principle of NOx, construct a resolution gas body space separating with flue gas, the NOx then resolving is sent to NOx recovery system and reclaims, and in respiratory box, liquid phase absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger system of utilizing space; Comprise interconnective flue gas input system, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise the slurry spraying system being connected with described smoke absorption system, also comprise the NOx recovery system that is connected with slurry spraying system and the recovery system of sulphite.
Described flue gas input system by inputting flue, flue air blast forms;
Described smoke absorption system forms by combining respiratory box, and described respiratory box top is provided with slurries spray thrower, and bottom is provided with dividing plate, liquid-droping groove, liquid phase region, and dividing plate, downspout, liquid phase region and respiratory box cylindrical shell wall form air pocket jointly; Described liquid phase region is provided with weir; Described combination respiratory box, each respiratory box docks mutually, forms exhaust gases passes district, parsing gas channel region and the liquid phase region of UNICOM; Lower end, the 1st respiratory box liquid phase region of described combination respiratory box is provided with underflow feeder;
Described flue gas demister system is by forming except fog chamber, and the described fog chamber that removes is provided with one-level demist layer and secondary demist layer, is provided with one-level demist layer and rinses water layer before and after described one-level demist layer, is provided with secondary demist layer and rinses water layer before described secondary demist layer; Demist lower box part is provided with alkali lye charging aperture and liquid phase region;
Described purifying smoke output system is comprised of chimney;
Described slurry spraying system is comprised of slurries spray thrower in slurry circulating pump, case;
Described NOx recovery system is by the air pocket in respiratory box, oxygen mixer, oxidation pipeline air blast, NO 2absorption tower and NO 2absorbent circulating pump forms;
Described sulphite recovery system is comprised of underflow liquid pump, filter, filtrate receiver and output of products pump.
A kind of box flue gas purification system of application the application, comprises the following steps:
(1) flue gas input
Flue gas, by inputting flue input, is sent into absorption system through the supercharging of flue air blast;
(2) absorption of flue gas
Through the supercharging of flue air blast, send into respiratory box gas approach, in respiratory box, by slurries spray thrower spray-absorption, pass through the absorption of plural serial stage respiratory box, the dust in flue gas, SO 2be absorbed with NOx, then send except fog chamber demist purification;
(3) flue gas demist purifies
Flue gas after desulphurization denitration is sent into except fog chamber gas approach, except in fog chamber successively through one-level demist layer before flushing water layer, one-level demist layer, one-level demist layer afterflush water layer, secondary demist layer rinse water layer and secondary demist layer, smoke-purifying pneumatic transmission flue gas emptying;
(4) flue gas is emptying
After flue gas demist, purifying smoke is emptying by chimney;
(5) circulation of slurries
Dust, SO in respiratory box, have been absorbed 2with the slurries of NOx, the lower space that enters respiratory box, in the lower space liquid phase region of respiratory box, there is the analytic function of NOx; In respiratory box liquid phase region, be provided with weir, maintain certain liquid level, overflow slurry send the slurries spray thrower of respiratory box upper space to spray by slurry circulating pump, realizes the circulation of slurries;
(6) NOx recycles
The parsing gas that air pocket in respiratory box is collected, after mixing, adds force feed NO by oxidation pipeline air blast with oxygen in oxygen mixer 2absorption tower, NO 2in absorption tower, liquid phase is by NO 2absorbent circulating pump is realized circulation; NO 2absorbent directly adds NO 2absorption tower, contains nitre product at NO 2on absorbent circulating pump branch road, leave system output; NO 2absorb tower top and be connected with oxygen mixer, the gas that unreacting gas and absorption reaction generate is all directly sent to oxygen mixer, then realizes by the supercharging of oxidation pipeline air blast the circulation that NOx oxidation absorbs;
(7) recovery of sulphite product
In the lower end, liquid phase region, bottom of combining the 1st respiratory box of respiratory box, be provided with underflow feeder, the underflow liquid of collecting in underflow feeder is filtered by underflow liquid pump delivery of filtered machine, filters solid phase for useless solid discharge; Filter liquid phase and be mainly sulphite, by filtrate receiver, collected, by sulfur-bearing output of products pump, exported.
Described step (1) (2) (3) (4) is the path of flue gas, the dust in flue gas, SO 2be absorbed in step (2) with NOx, then pass through step (3) demist, purifying smoke is emptying.
In described step (2), flue gas is through respiratory box, the dust in flue gas, SO 2be absorbed with NOx, in step (2) is carried out, need the regeneration cycle of step (5) slurries, ensured continuous absorption power, plural serial stage has ensured final assimilation effect;
In described step (5), the circulation of slurries constantly provides the NOx of recovery for step (6), and step (6) makes again slurries be regenerated, and has ensured continuous absorption power; Described step (7) constantly shifts out product, and in step (3), provide absorption raw material adding continuously of alkali lye.
Secondary demist layer flushing water and one-level demist layer flushing water that described step (3) is removed in fog chamber by fresh water (FW) pumping are collected in demist lower box part liquid phase region; The alkali lye that demist lower box part adds is diluted by demist lower box part liquid phase region fresh water (FW), then is sent to step (2) afterbody respiratory box, then in the liquid phase region of UNICOM, flows forward; In respiratory box, flue-gas temperature is lowered, and in liquid phase, moisture partly evaporates and taken out of absorption system, and the moisture that absorption system need to be supplementary is added except fog chamber by fresh water (FW), realizes the balance of water.
The filtrate receiver upper space of described step (7) is also connected with the oxygen mixer of step (6), and the gas that filtrate is resolved is also utilized.
The above alkaline absorbent is a kind of or composite in NaOH, potassium hydroxide, sodium carbonate, potash, sodium acid carbonate, saleratus.
The application be embodied in following some:
(1) this system is reasonable, reaches dedusting, desulphurization denitration reclaim the object of NOx simultaneously, and system small investment, stable and reliable operation, resources and energy consumption are few.
(2) respiratory box top is provided with slurries spray thrower, and bottom is provided with dividing plate, liquid-droping groove, liquid phase region, and dividing plate, downspout, liquid phase region and respiratory box cylindrical shell wall form the NOx gas that air pocket dynamically absorbs to collect absorption liquid jointly; In respiratory box liquid phase region, be provided with weir, maintain certain liquid level, overflow slurry send the slurries spray thrower of respiratory box upper space to spray by slurry circulating pump, realizes the circulation of slurries; Each respiratory box docks mutually, forms exhaust gases passes district, parsing gas channel region and the liquid phase region of UNICOM.
(3) alkali lye, by except fog chamber input afterbody respiratory box, then flows forward in the liquid phase region of UNICOM, with smoke movement opposite direction, forms the effect of whole counter-current absorption.
(4) NOx recovery system is independent, obtains pure in nitre product; Sulphite recovery system is obtained purer sulfur-bearing product, has compared with high product and is worth.
(5) implementation result, desulfurization degree >=99%, denitration rate >=90%, the NOx rate of recovery >=90%.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of box flue gas purification system of the application schematic diagram
1-input flue in Fig. 1,2-flue air blast, 3-respiratory box, 4-is except fog chamber, and 5-one-level demist layer, 6-one-level demist layer rinse water layer, 7-secondary demist layer rinses water layer, 8-secondary demist layer, 9-chimney, 10-is except fog chamber liquid phase region, 11-lye pump, 12-underflow liquid pump, 13-filter, 14-filtrate receiver, 15-sulfur-bearing output of products pump, 16-slurries spray thrower, 17-dividing plate, 18-downspout, the dense slurry collecting groove of 19-, 20-liquid phase region, 21-air pocket, 22-oxygen mixer, 23-oxidation pipeline air blast, 24-NO 2absorption tower, 25-NO 2absorbent circulating pump, 26-slurry circulating pump, 27-weir; A-flue gas, B-purifying smoke, C-fresh water (FW), D-alkali lye, E-NO 2absorbent, F-contains nitre product, G-oxygen, H-sulfur-bearing product, I-is useless solid.
The first half equipment 3 of Fig. 1 is front view structural representations of respiratory box, and the latter half equipment 3 is side view structural representations of the 1st respiratory box of combination respiratory box.
The specific embodiment
Embodiment 1
As shown in Figure 1, a kind of box flue gas purification system, is with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to alkaline absorbent, dynamically absorb and resolve the principle of NOx, construct a resolution gas body space separating with flue gas, the NOx then resolving is sent to NOx recovery system and reclaims, and in respiratory box, liquid phase absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger system of utilizing space; Comprise interconnective flue gas input system, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise the slurry spraying system being connected with described smoke absorption system, also comprise the NOx recovery system that is connected with slurry spraying system and the recovery system of sulphite;
Described flue gas A input system by inputting flue 1, flue air blast 2 forms;
Described smoke absorption system forms by combining respiratory box, described respiratory box 3 tops are provided with slurries spray thrower 16, bottom is provided with dividing plate 17, liquid-droping groove 18, liquid phase region 20, and dividing plate 17, downspout 18, liquid phase region 20 and respiratory box 3 cylindrical shell walls form air pocket 21 jointly; Described liquid phase region is provided with weir 27; Described combination respiratory box, each respiratory box 3 docks mutually, forms exhaust gases passes district, parsing gas channel region and the liquid phase region of UNICOM; 20 lower ends, the 1st respiratory box 3 liquid phase region of described combination respiratory box are provided with underflow feeder 19;
Described flue gas demister system is by forming except fog chamber 4, the described fog chamber 4 that removes is provided with one-level demist layer 5 and secondary demist layer 8, described one-level demist layer 5 front and back are provided with one-level demist layer and rinse water layer 6, be provided with secondary demist layer and rinse water layer 7 before described secondary demist layer; Except fog chamber 4 bottoms are provided with alkali lye charging aperture and remove fog chamber liquid phase region 10;
Described purifying smoke B output system is comprised of chimney 9;
Described slurry spraying system is comprised of slurries 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 air blast 23, NO 2absorption tower 24 and NO 2absorbent circulating pump 25 forms;
Described sulphite recovery system is comprised of underflow liquid pump 12, filter 13, filtrate receiver 14 and sulfur-bearing output of products pump 15;
A kind of box flue gas purification system of application the application, comprises the following steps:
(1) flue gas input
Flue gas A, by inputting flue 1 input, sends into absorption system through 2 superchargings of flue air blast;
(2) absorption of flue gas
Through 2 superchargings of flue air blast, send into respiratory box 3 gas approach, in respiratory box 3, by slurries spray thrower 16 spray-absorptions, pass through the absorption of plural serial stage respiratory box 3, the dust in flue gas, SO 2be absorbed with NOx, then send except fog chamber 4 demists purifications;
(3) flue gas demist purifies
Flue gas after desulphurization denitration is sent into except fog chamber 4 gas approach, in removing fog chamber 4, rinse water layer 7 and secondary demist layer 8 successively through flushing water layer, one-level demist layer 5, one-level demist layer afterflush water layer 6, secondary demist layer before one-level demist layer, purifying smoke B send the emptying of flue gas;
(4) flue gas is emptying
After flue gas demist, purifying smoke B is emptying by chimney 9;
(5) circulation of slurries
At interior dust, the SO of having absorbed of respiratory box 3 2with the slurries of NOx, the lower space that enters respiratory box 3, in the lower space liquid phase region 20 of respiratory box 3, there is the analytic function of NOx; In respiratory box liquid phase region 20, be provided with weir 27, maintain certain liquid level, overflow slurry is sent slurries spray thrower 16 sprays of respiratory box upper space by slurry circulating pump 26, realize the circulation of slurries;
(6) NOx recycles
The parsing gas that air pocket 21 in respiratory box 3 is collected, after mixing, adds force feed NO by oxidation pipeline air blast 23 with oxygen G in oxygen mixer 22 2absorption tower 24, NO 2the interior liquid phase in absorption tower 24 is by NO 2absorbent circulating pump 25 is realized circulation; NO 2absorbent E directly adds NO 2absorption tower 24, contains nitre product F at NO 2on absorbent circulating pump 25 branch roads, leave system output; NO 224 tops, absorption tower are connected with oxygen mixer 22, and the gas that unreacting gas and absorption reaction generate is all directly sent to oxygen mixer 22, then realize by 23 superchargings of oxidation pipeline air blast the circulation that NOx oxidation absorbs;
(7) recovery of sulphite product
In 20 lower ends, liquid phase region, bottom of combining the 1st respiratory box 3 of respiratory box, be provided with underflow feeder 19, the underflow liquid of collecting in underflow feeder 19 is filtered by underflow liquid pump 12 delivery of filtered machines 13, filters solid phase for the solid I discharge of giving up; Filter liquid phase and be mainly sulphite, by filtrate receiver 14, collected, by sulfur-bearing output of products pump 15 output sulfur-bearing product H.
Take four respiratory box tandem compounds, alkali lye adopts sodium carbonate, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.5%, denitration efficiency 93.5%, the NOx rate of recovery 92.0%.
Embodiment 2
As shown in Figure 1, a kind of box flue gas purification system, its equipment arranges with implementation step with embodiment 1, divided by lower setting and step:
Alkali lye adopts sodium carbonate, and concentration is 20%, and parallel connection adds each respiratory box.
Application the application box flue gas purification system, desulfuration efficiency 99.3%, denitration efficiency 93.0%, the NOx rate of recovery 91.8%.
Embodiment 3
As shown in Figure 1, a kind of box flue gas purification system, its equipment arranges with implementation step with embodiment 1, divided by lower setting and step:
Take four respiratory box tandem compounds, each respiratory box structure is with the 1st respiratory box, and liquid phase does not communicate, and by setting up pump, from the 4th respiratory box, carries step by step to the 1st case, maintains each respiratory box liquid level; Alkali lye adopts NaOH, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.6%, denitration efficiency 93.7%, the NOx rate of recovery 92.1%.
The invention has the beneficial effects as follows: (1) this system is reasonable, reach dedusting, desulphurization denitration reclaim the object of NOx simultaneously, system small investment, stable and reliable operation, resources and energy consumption are few; (2) in respiratory box liquid phase region, be provided with weir, maintain certain liquid level; Each respiratory box docks mutually, forms exhaust gases passes district, parsing gas channel region and the liquid phase region of UNICOM; (3) alkali lye, by except fog chamber input afterbody respiratory box, then flows forward in the liquid phase region of UNICOM, with smoke movement opposite direction, forms the effect of whole counter-current absorption; (4) NOx recovery system is independent, obtains pure in nitre product; Sulphite recovery system is obtained purer sulfur-bearing product, has compared with high product and is worth; (5) implementation result, desulfurization degree >=99%, denitration rate >=90%, the NOx rate of recovery >=90%.
The application is not limited to above-mentioned embodiment, those skilled in the art make to any apparent improvement of above-mentioned embodiment or change, can not exceed the protection domain of design of the present invention and claims.

Claims (4)

1. a box flue gas purification system, being one is with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to alkaline absorbent, dynamically absorb and resolve the principle of NOx, construct a resolution gas body space separating with flue gas, the NOx then resolving is sent to NOx recovery system and reclaims, and in respiratory box, liquid phase absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger system of utilizing space; Comprise interconnective flue gas input system, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise the slurry spraying system being connected with described smoke absorption system, also comprise the NOx recovery system that is connected with slurry spraying system and the recovery system of sulphite.
2. box flue gas purification system according to claim 1, is characterized in that:
Described flue gas input system by inputting flue, flue air blast forms;
Described smoke absorption system forms by combining respiratory box, and described respiratory box top is provided with slurries spray thrower, and bottom is provided with dividing plate, liquid-droping groove, liquid phase region, and dividing plate, downspout, liquid phase region and respiratory box cylindrical shell wall form air pocket jointly; Described liquid phase region is provided with weir; Described combination respiratory box, each respiratory box docks mutually, forms exhaust gases passes district, parsing gas channel region and the liquid phase region of UNICOM; Lower end, the 1st respiratory box liquid phase region of described combination respiratory box is provided with underflow feeder;
Described flue gas demister system is by forming except fog chamber, and the described fog chamber that removes is provided with one-level demist layer and secondary demist layer, is provided with one-level demist layer and rinses water layer before and after described one-level demist layer, is provided with secondary demist layer and rinses water layer before described secondary demist layer; Demist lower box part is provided with alkali lye charging aperture and liquid phase region;
Described purifying smoke output system is comprised of chimney;
Described slurry spraying system is comprised of slurries spray thrower in slurry circulating pump, case;
Described NOx recovery system is by the air pocket in respiratory box, oxygen mixer, oxidation pipeline air blast, NO 2absorption tower and NO 2absorbent circulating pump forms;
Described sulphite recovery system is comprised of underflow liquid pump, filter, filtrate receiver and output of products pump.
3. box flue gas purification system according to claim 1, is characterized in that: comprise the following steps:
(1) flue gas input
Flue gas, by inputting flue input, is sent into absorption system through the supercharging of flue air blast;
(2) absorption of flue gas
Through the supercharging of flue air blast, send into respiratory box gas approach, in respiratory box, by slurries spray thrower spray-absorption, pass through the absorption of plural serial stage respiratory box, the dust in flue gas, SO 2be absorbed with NOx, then send except fog chamber demist purification;
(3) flue gas demist purifies
Flue gas after desulphurization denitration is sent into except fog chamber gas approach, except in fog chamber successively through one-level demist layer before flushing water layer, one-level demist layer, one-level demist layer afterflush water layer, secondary demist layer rinse water layer and secondary demist layer, smoke-purifying pneumatic transmission flue gas emptying;
(4) flue gas is emptying
After flue gas demist, purifying smoke is emptying by chimney;
(5) circulation of slurries
Dust, SO in respiratory box, have been absorbed 2with the slurries of NOx, the lower space that enters respiratory box, in the lower space liquid phase region of respiratory box, there is the analytic function of NOx; In respiratory box liquid phase region, be provided with weir, maintain certain liquid level, overflow slurry send the slurries spray thrower of respiratory box upper space to spray by slurry circulating pump, realizes the circulation of slurries;
(6) NOx recycles
The parsing gas that air pocket in respiratory box is collected, after mixing, adds force feed NO by oxidation pipeline air blast with oxygen in oxygen mixer 2absorption tower, NO 2in absorption tower, liquid phase is by NO 2absorbent circulating pump is realized circulation; NO 2absorbent directly adds NO 2absorption tower, contains nitre product at NO 2on absorbent circulating pump branch road, leave system output; NO 2absorb tower top and be connected with oxygen mixer, the gas that unreacting gas and absorption reaction generate is all directly sent to oxygen mixer, then realizes by the supercharging of oxidation pipeline air blast the circulation that NOx oxidation absorbs;
(7) recovery of sulphite product
In the lower end, liquid phase region, bottom of combining the 1st respiratory box of respiratory box, be provided with underflow feeder, the underflow liquid of collecting in underflow feeder is filtered by underflow liquid pump delivery of filtered machine, filters solid phase for useless solid discharge; Filter liquid phase and be mainly sulphite, by filtrate receiver, collected, by sulfur-bearing output of products pump, exported.
4. box flue gas purification system according to claim 3, is characterized in that: secondary demist layer flushing water and one-level demist layer flushing water that described step (3) is removed in fog chamber by fresh water (FW) pumping are collected in demist lower box part liquid phase region; The alkali lye that demist lower box part adds is diluted by demist lower box part liquid phase region fresh water (FW), then is sent to step (2) afterbody respiratory box, then in the liquid phase region of UNICOM, flows forward; In respiratory box, flue-gas temperature is lowered, and in liquid phase, moisture partly evaporates and taken out of absorption system, and the moisture that absorption system need to be supplementary is added except fog chamber by fresh water (FW), realizes 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
CN105771579A (en) * 2016-04-20 2016-07-20 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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CN102512927A (en) * 2011-12-31 2012-06-27 艾淑艳 Integrated flue gas desulfurizing and denitrating purification system and purification technology for same

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Publication number Priority date Publication date Assignee Title
CN104492228A (en) * 2014-12-17 2015-04-08 安徽理工大学 System for extracting sulfur dioxide in dense smoke
CN105771579A (en) * 2016-04-20 2016-07-20 北京中能诺泰节能环保技术有限责任公司 Flue gas purification system
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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