CN203899437U - Tower tank fume gas purification system - Google Patents

Tower tank fume gas purification system Download PDF

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Publication number
CN203899437U
CN203899437U CN201420268008.1U CN201420268008U CN203899437U CN 203899437 U CN203899437 U CN 203899437U CN 201420268008 U CN201420268008 U CN 201420268008U CN 203899437 U CN203899437 U CN 203899437U
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China
Prior art keywords
flue gas
box
absorption
liquid
respiratory box
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CN201420268008.1U
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Chinese (zh)
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陶俊
陶陶
徐继红
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Huainan City's Bright Moon Environmental Protection Science And Technology Ltd Co
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Huainan City's Bright Moon Environmental Protection Science And Technology Ltd Co
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model discloses a tower tank fume gas purification system, and belongs to the technical field of fume gas treatment and environmental devices. The system is characterized by comprising a fume gas input system, a fume gas dust removal condensation system, a fume gas absorption system, a fume gas demist system and a purification fume gas output system all connected with each other, and further comprises an absorption agent feeding system, an absorption slurry spray system and an NOx recovery system which are connected with the fume gas absorption system, a sulphite recovery system connected with the fume gas dust removal condensation system, and a rinse water system connected with the fume gas demist system, and further comprises a concentrated slurry spray system connected with the dust removal concentration system and the absorption slurry spray system. The system has the benefits that firstly, the structure of the tower tank is convenient for assembly; secondly, the aims that the desulphuization rate is larger than or equal to 99 %, the denitration rate is larger than or equal to 90 %, the NOx recovery rate is larger than and equal to 90 %, and the byproduct pure value is high are reached.

Description

A kind of tower case flue gas purification system
Technical field
The application belongs to flue gas and processes and environmental unit technical field.The present invention relates to a kind of tower case flue gas purification system, more particularly, is that a kind of longitudinal arrangement respiratory box forms tower box structure, constructs a resolution gas body space separating with exhaust gases passes, with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to the dynamic principle that absorbs and resolve NOx of alkaline absorbent, the NOx then resolving is sent to NOx recovery system and reclaims, and the interior liquid phase of respiratory box absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger flue gas purification system that utilizes 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 ", be to carry out respectively in different devices and flow process to removing of sulfureous in flue gas, nitrogen pollutant, 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, restricts this method applying in China.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 CN 202620999 U disclose 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 and the absorbent induction system that are connected with smoke absorption cleaning 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 tower case 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 kind of tower case flue gas purification system, is that a kind of longitudinal arrangement respiratory box forms tower box structure, constructs a resolution gas body space separating with exhaust gases passes, with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to the dynamic principle that absorbs and resolve NOx of alkaline absorbent, the NOx then resolving is sent to NOx recovery system and reclaims, and the interior liquid phase of respiratory box absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger flue gas purification system that utilizes space; Comprise interconnective flue gas input system, flue gas ash removal concentration systems, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise that the absorbent being connected with described smoke absorption system adds system, absorbs slurry spraying system and NOx recovery system, the recovery system of the sulphite being connected with flue gas ash removal concentration systems, the flushing water system being connected with flue gas demister system, also comprises the dense slurry spraying system being connected with absorption slurry spraying system with dedusting concentration systems.
Described flue gas input system by inputting flue, flue air blast forms;
Described flue gas ash removal concentration systems is made up of the concentrated case of dedusting;
Described smoke absorption system is made up of longitudinal combination respiratory box and described respiratory box flue gas interface channel;
Described flue gas demister system is made up of demister, and described demister is provided with one-level demist layer and secondary demist layer;
Described purifying smoke output system is made up of chimney;
Described absorbent adds system to form by absorbing slurries spray thrower in lye tank (vat), lye pump and tower case;
Described absorption slurry spraying system absorbs slurries spray thrower in slurry circulating pump, tower case and forms by absorbing;
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 composition;
Described sulphite recovery system is made up of thickened pulp liquid pump, filter, filtrate receiver and output of products pump;
Described flushing water system is rinsed water layer and secondary demist layer and is rinsed water layer and form by rinsing in tank, flush water pump, tower case one-level demist layer;
Described dense slurry spraying system absorbs liquid pump by underflow liquid spray thrower and dust-laden in underflow liquid pump, the concentrated case of dedusting and forms.
Further:
The concentrated upper box part of described dedusting is provided with underflow liquid 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; Lower end, the concentrated case liquid phase region of described dedusting is provided with thickened pulp feeder;
Described smoke absorption system is made up of longitudinal combination respiratory box, a resolution gas body space separating with exhaust gases passes of described respiratory box structure, top is exhaust gases passes, 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 combination respiratory box, structure and other combination box of the 1st grade of respiratory box are slightly different, the bottom liquid phase region of the 1st respiratory box is provided with weir, lower end is provided with dust-laden slurry collecting groove, and other combination respiratory box bottoms are provided with liquid distributing board, each respiratory box is docking mutually up and down, and the base plate of top box becomes the exhaust gases passes upper sealing plate of nowel, and the liquid of top box directly falls into nowel by liquid distributing board; The exhaust gases passes of respiratory boxs at different levels is connected by flue gas interface channel, and the air pocket of the concentrated case of respiratory boxs at different levels and dedusting is provided with air pocket connector by connecting pipe UNICOM; The top of last 1 grade of respiratory box does not have upper sealing plate, is provided with slurries spray thrower, and flue gas directly enters demister system, and described absorption system and demister system form tower box structure jointly;
Described absorbent adds system and described slurry spraying system to share slurries spray thrower in tower case.
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 dedusting concentration systems through the supercharging of flue air blast;
(2) dedusting is concentrated
Send into the high-temperature flue gas of the concentrated case of dedusting through the supercharging of flue air blast, contact with the underflow liquid cross-flow of the concentrated upper box part underflow liquid spray thrower spray of dedusting, flue-gas temperature is reduced rapidly, and liquid phase is concentrated, the dust in flue gas, part SO 2be absorbed with NOx, enter the liquid phase region of the concentrated case of dedusting, the common air pocket forming of the concentrated case cylindrical shell wall of dividing plate, downspout, liquid phase region and dedusting of the concentrated case of dedusting is collected the recovery of resolving gas and send NOx; The concentrated slurry that the thickened pulp feeder of lower end, the concentrated case liquid phase region of dedusting is collected high dust-laden send the recovery of sulphite;
(3) absorption of flue gas
Flue gas through the concentrated case dedusting of dedusting directly enters the 1st grade of respiratory box of tower case, the absorption liquid cross-flow falling with the 2nd grade of respiratory box liquid distributing board contacts, flue gas enters the 2nd grade of respiratory box through flue gas interface channel, flue gas moves upward step by step, and absorption liquid moves downward step by step, form the general layout of overall counter current contacting, through multistage absorption, the dust in flue gas, SO 2be absorbed with NOx, enter demister system; In respiratory boxs at different levels, the common air pocket collection parsing gas forming of dividing plate, downspout, liquid phase region and respiratory box cylindrical shell wall send the recovery of NOx; Send and absorb slurries circulation at the slurries of the bottom liquid phase region of the 1st grade of respiratory box, the dust-laden slurry collecting groove that lower end arranges is collected dust-laden slurries and is sent concentrated slurry circulation;
(4) flue gas demist purifies
Flue gas after desulphurization denitration directly enters demister, rinses water layer, secondary demist layer, secondary demist layer successively and rinses water layer, smoke-purifying pneumatic transmission flue gas emptying in demister through one-level demist layer, one-level demist layer;
(5) flue gas is emptying
After flue gas demist, purifying smoke is emptying by chimney;
(6) adding of absorbent
Alkaline absorbent adds lye tank (vat), is mixed to form absorption slurries sprays by the slurries that absorb slurries spray thrower and the input of absorption slush pump in lye pump input tower case;
(7) circulation of absorption slurries
Slurries at the bottom liquid phase region of the 1st grade of respiratory box absorb slurries spray thrower by absorbing in slurry circulating pump input tower case, are mixed to form absorbent slurry spray with alkali lye in lye pump input tower case, realize the circulation that absorbs slurries.
(8) 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;
(9) recovery of sulphite
The high dust-laden concentrated slurry of collecting in the underflow feeder arranging in the lower end, liquid phase region, bottom of the concentrated case of dedusting is filtered by thickened pulp liquid pump delivery of filtered machine, filters solid phase for useless solid discharge; Filter liquid phase and be mainly sulphite, collected by filtrate receiver, exported by sulfur-bearing output of products pump;
(10) adding and water balance of fresh water (FW)
Fresh water (FW) adds flushing tank, rinses water layer and secondary demist layer flushing water layer by one-level demist layer in flush water pump input demister, ensures the normal work of demister; In smoke absorption system, part moisture is taken out of by flue gas, supplements fresh water (FW), thereby realizes the balance of water;
(11) circulation of concentrated slurry
The concentrated slurry that concentrates the liquid phase region, bottom of case in dedusting is carried the underflow liquid spray thrower in the concentrated case of dedusting to spray by underflow liquid pump, realize the circulation of concentrated slurry; The dust-laden slurries of collecting at the dust-laden slurry collecting groove of the bottom liquid phase region of the 1st grade of respiratory box are by the concentrated case of dust-laden slush pump input dedusting, the high dust-laden concentrated slurry of collecting in the underflow feeder arranging in the lower end, liquid phase region, bottom of the concentrated case of dedusting, by the concentrated case of thickened pulp liquid pump output dedusting, is realized the balance of concentrated slurry.
Described step (1) (2) (3) (4) (5) is the path of flue gas, and wherein the dust in flue gas is mainly absorbed in step (2), the SO in flue gas 2mainly in step (3), be absorbed with NOx, then pass through step (4) demist, purifying smoke is emptying.
In described step (2), dust major part in flue gas is removed, make the few dust-laden of flue gas of step (3), make the absorption slush pump of step (7) be suitable for liquid phase pump, make the mobile smooth and easy of step (3) liquid phase, thereby ensure the desulfurization off sulfide effect of step (3);
Described step (3), in respiratory boxs at different levels, flue gas is all that cross-flow contacts with absorbing slurries, but forms the general layout of overall counter current contacting, has ensured final assimilation effect;
In described step (6), (7), add alkali lye and loop slurry to be mixed to form absorption slurries, through the absorption of step (3), part slurries are realized circulation by step (6), part is sent step (11), thus the balance of the absorption slurries of performing step (3);
The production containing nitre, sulfur-bearing product is realized in described step (8), (9), the top of the filtrate receiver of described step (9) is connected with the oxygen mixer of described step (8), and the parsing gas that filtrate receiver discharges is also utilized;
Described step (10) ensures the normal operation of step (4), and makes the water of whole system reach balance.
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, take respiratory box longitudinal combination to form tower box structure, combined and instant, equipment is convenient to manufacture, transports and is installed, reach dedusting, desulphurization denitration reclaim the object of NOx simultaneously, system small investment, stable and reliable operation, resources and energy consumption are few.
(2) setting of the concentrated case of dedusting was removed the dust major part in flue gas before entering tower case, made to absorb slush pump and was suitable for liquid phase pump, made the mobile smooth and easy of liquid phase, thereby ensured desulfurization off sulfide effect.
(3) in respiratory boxs at different levels, flue gas is all that cross-flow contacts with absorbing slurries, but forms the general layout of overall counter current contacting, has ensured final assimilation effect.
(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%.
Brief description of the drawings
Accompanying drawing 1 is a kind of tower case of the application flue gas purification system schematic diagram
1-input flue in Fig. 1,2-flue air blast, 3-dedusting concentrates case, 4-respiratory box, 5-demister, 6-chimney, 7-absorbs slurry circulating pump, 8-lye tank (vat), 9-lye pump, 10-rinses tank, 11-flush water pump, 12-underflow liquid spray thrower, 13-concentrated slurry feeder, 14-concentrated slurry rear pump, 15-filter, 16-filtrate receiver, 17-sulfur-bearing output of products pump, the 1st grade of respiratory box of 18-, 19-respiratory box liquid phase region, 20-weir, 21-air pocket, 22-oxygen mixer, 23-oxidation pipeline air blast, 24-NO 2absorption tower, 25-NO 2absorbent circulating pump, 26-dividing plate, 27-downspout, 28-flue gas interface channel, 29-air pocket connector, 30-absorbs slurries spray thrower, and 31-one-level demist layer, 32-one-level demist layer rinse water layer, 33-secondary demist layer rinses water layer, 34-secondary demist layer, 35-liquid distributing board, 36-dust-laden slurry collecting groove, 37-dust-laden slurry feeding pump, 38-underflow liquid pump; A-flue gas, B-purifying smoke, C-alkali lye, D-fresh water (FW), E-NO 2absorbent, F-contains nitre product, G-oxygen, H-sulphur products, I-is useless solid.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, a kind of tower case flue gas purification system, is that a kind of longitudinal arrangement respiratory box forms tower box structure, constructs a resolution gas body space separating with exhaust gases passes, with alkaline absorbent, absorbs SO in flue gas in respiratory box 2and NOx, according to the dynamic principle that absorbs and resolve NOx of alkaline absorbent, the NOx then resolving is sent to NOx recovery system and reclaims, and the interior liquid phase of respiratory box absorbs SO 2after product be mainly sulphite, directly send absorption system and leave the larger flue gas purification system that utilizes space; Comprise interconnective flue gas input system, flue gas ash removal concentration systems, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise that the absorbent being connected with described smoke absorption system adds system, absorbs slurry spraying system and NOx recovery system, the recovery system of the sulphite being connected with flue gas ash removal concentration systems, the flushing water system being connected with flue gas demister system, also comprises the dense slurry spraying system being connected with absorption slurry spraying system with dedusting concentration systems.
Described flue gas input system by inputting flue 1, flue air blast 2 forms;
Described flue gas ash removal concentration systems is made up of the concentrated case 3 of dedusting;
Described smoke absorption system is made up of longitudinal combination respiratory box 4 and described respiratory box flue gas interface channel 28;
Described flue gas demister system is made up of demister 5;
Described purifying smoke output system is made up of chimney 6;
Described absorbent adds system to form by absorbing slurries spray thrower 30 in lye tank (vat) 8, lye pump 9 and tower case;
Described slurry spraying system absorbs slurries spray thrower 30 in slurry circulating pump 7, tower case and forms by absorbing;
Described NOx recovery system is by the air pocket 21 in respiratory box, oxygen mixer 22, oxidation pipeline air blast 2324, NO 2absorption tower and NO 2absorbent circulating pump 25 forms;
Described sulphite recovery system is made up of thickened pulp liquid pump 14, filter 15, filtrate receiver 16 and output of products pump 17;
Described flushing water system is rinsed water layer 32 and secondary demist layer and is rinsed water layer 34 and form by rinsing in tank 10, flush water pump 11, tower case one-level demist layer;
Described dense slurry spraying system absorbs liquid pump 37 by underflow liquid spray thrower 12 and dust-laden in underflow liquid pump 38, the concentrated case of dedusting and forms.
Further:
The concentrated case of described dedusting 3 tops are provided with underflow liquid spray thrower 12, 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 21 jointly; The concentrated case of described dedusting 3 lower ends, liquid phase region are provided with thickened pulp feeder 13;
Described smoke absorption system is made up of longitudinal combination respiratory box, a resolution gas body space separating with exhaust gases passes of described respiratory box structure, top is exhaust gases passes, bottom is provided with dividing plate 26, liquid-droping groove 27, liquid phase region 19, and dividing plate 26, downspout 27, liquid phase region 19 and respiratory box cylindrical shell wall form air pocket 21 jointly; Described combination respiratory box, structure and other combination box of the 1st grade of respiratory box 18 are slightly different, the bottom liquid phase region 19 of the 1st respiratory box 18 is provided with weir 20, lower end is provided with dust-laden slurry collecting groove 36, and other combination respiratory box bottoms are provided with liquid distributing board 35, each respiratory box is docking mutually up and down, and the base plate of top box becomes the exhaust gases passes upper sealing plate of nowel, and the liquid of top box directly falls into nowel by liquid distributing board 35; The exhaust gases passes of respiratory boxs at different levels is connected by flue gas interface channel 28, and the air pocket of the concentrated case 3 of respiratory boxs at different levels and dedusting is provided with air pocket connector 29 by connecting pipe UNICOM;
The top of described last 1 grade of respiratory box does not have upper sealing plate, is provided with and absorbs slurries spray thrower 30, and flue gas directly enters demister system, and described absorption system and demister system form tower box structure jointly;
Described demister 5 is provided with one-level demist layer 31 and secondary demist layer 33;
Described absorbent adds system and described slurry spraying system to share absorption slurries spray thrower 30 in tower case.
A kind of box flue gas purification system of application the application, comprises the following steps:
(1) flue gas input
Flue gas A inputs by inputting flue 1, sends into dedusting concentration systems through 2 superchargings of flue air blast;
(2) dedusting is concentrated
Send into the high-temperature flue gas of the concentrated case 3 of dedusting through 2 superchargings of flue air blast, the underflow liquid cross-flow spraying with the concentrated case 3 top underflow liquid spray throwers 12 of dedusting contacts, and flue-gas temperature is reduced rapidly, and liquid phase is concentrated, the dust in flue gas, part SO 2be absorbed with NOx, enter the liquid phase region of the concentrated case of dedusting, the common air pocket forming of the concentrated case cylindrical shell wall of dividing plate, downspout, liquid phase region and dedusting of the concentrated case of dedusting is collected the recovery of resolving gas and send NOx; The concentrated slurry that the thickened pulp feeder 13 of lower end, the concentrated case liquid phase region of dedusting is collected high dust-laden send the recovery of sulphite;
(3) absorption of flue gas
Flue gas through concentrated case 3 dedustings of dedusting directly enters the 1st grade of respiratory box 18 of tower case 4, the absorption liquid cross-flow falling with the 2nd grade of respiratory box liquid distributing board 35 contacts, flue gas enters the 2nd grade of respiratory box through flue gas interface channel 28, flue gas moves upward step by step, and absorption liquid moves downward step by step, form the general layout of overall counter current contacting, through multistage absorption, the dust in flue gas, SO 2be absorbed with NOx, enter demister system; In respiratory boxs at different levels, the common air pocket the forming 21 collection parsing gases of dividing plate 26, downspout 27, liquid phase region 19 and respiratory box cylindrical shell wall send the recovery of NOx; Send and absorb slurries circulation at the slurries of the bottom liquid phase region of the 1st grade of respiratory box, the dust-laden slurry collecting groove 36 that lower end arranges is collected dust-laden slurries and is sent concentrated slurry circulation;
(4) flue gas demist purifies
Flue gas after desulphurization denitration directly enters demister 5, in demister 5, rinses water layer 32, secondary demist layer 33, secondary demist layer flushing water layer 34 successively through one-level demist layer 31, one-level demist layer, and purifying smoke B send the emptying of flue gas;
(5) flue gas is emptying
After flue gas demist, purifying smoke B is emptying by chimney 6;
(6) adding of absorbent
Alkaline absorbent C adds lye tank (vat) 8, is inputted the interior absorption slurries of tower case 4 spray thrower 30 and is absorbed slurries that slush pump 7 inputs and be mixed to form and absorb slurries and spray by lye pump 9;
(7) circulation of absorption slurries
Input in tower case and absorb slurries spray thrower 30 by absorbing slurry circulating pump 7 at the slurries of the bottom liquid phase region of the 1st grade of respiratory box 18, be mixed to form absorbent slurry spray with alkali lye in lye pump input tower case, realize the circulation that absorbs slurries.
(8) NOx recycles
The parsing gas that air pocket 21 in respiratory box 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, contains nitre product F at NO 2on absorbent circulating pump branch road, leave system output; NO 2absorption tower 24 is pushed up with oxygen mixer 22 and is connected, and the gas that unreacting gas and absorption reaction generate is all directly sent to oxygen mixer 22, then realizes by 23 superchargings of oxidation pipeline air blast the circulation that NOx oxidation absorbs;
(9) recovery of sulphite
The high dust-laden concentrated slurry of the underflow feeder 13 interior collections that arrange in the lower end, liquid phase region, bottom of the concentrated case 3 of dedusting is filtered by thickened pulp liquid pump 14 delivery of filtered machines 15, filters solid phase for useless solid I discharge; Filter liquid phase and be mainly sulphite, collected by filtrate receiver 16, export sulphur products H by sulfur-bearing output of products pump 17;
(10) adding and water balance of fresh water (FW)
Fresh water (FW) D adds flushing tank 10, inputs the interior one-level demist of demister 5 layer rinse water layer 32 and secondary demist layer flushing water layer 34 by flush water pump 11, ensures the normal work of demister 5; In smoke absorption system, part moisture is taken out of by flue gas, supplements fresh water (FW) C, thereby realizes the balance of water;
(11) circulation of concentrated slurry
The concentrated slurry that concentrates the liquid phase region, bottom of case 3 in dedusting is carried the underflow liquid spray thrower 12 in the concentrated case 3 of dedusting to spray by underflow liquid pump 38, realize the circulation of concentrated slurry; The dust-laden slurries of collecting at the dust-laden slurry collecting groove 36 of the bottom liquid phase region of the 1st grade of respiratory box are inputted the concentrated case 3 of dedusting by dust-laden slush pump 37, the high dust-laden concentrated slurry of the underflow feeder 13 interior collections that arrange in the lower end, liquid phase region, bottom of the concentrated case of dedusting is exported the concentrated case 3 of dedusting by thickened pulp liquid pump 14, realizes the balance of concentrated slurry.
Take four respiratory box combinations, alkali lye adopts sodium carbonate, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.4%, denitration efficiency 92.5%, NOx rate of recovery 92.O%.
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:
Take five respiratory box combinations, alkali lye adopts sodium carbonate, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.6%, denitration efficiency 93.5%, the NOx rate of recovery 93.0%.
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; Alkali lye adopts NaOH, and concentration is 20%.
Application the application box flue gas purification system, desulfuration efficiency 99.5%, denitration efficiency 92.7%, the NOx rate of recovery 92.2%.
The invention has the beneficial effects as follows: (1) takes respiratory box longitudinal combination to form tower box structure, combined and instant, equipment is convenient to manufacture, transports and is installed; (2) the dust major part in flue gas was removed before entering tower case, made to absorb slush pump and was suitable for liquid phase pump, made the mobile smooth and easy of liquid phase, thereby ensured desulfurization off sulfide effect; (3) in respiratory boxs at different levels, flue gas is all that cross-flow contacts with absorbing slurries, but forms the general layout of overall counter current contacting, has ensured final assimilation effect; (4) reach desulfurization degree >=99%, denitration rate >=90%, the NOx rate of recovery >=90%, the pure value of by-product is high.
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 (3)

1. a tower case flue gas purification system, is characterized in that: be that a kind of longitudinal arrangement respiratory box forms tower box structure, construct a resolution gas body space separating with exhaust gases passes; Comprise interconnective flue gas input system, flue gas ash removal concentration systems, smoke absorption system, flue gas demister system and purifying smoke output system, also comprise that the absorbent being connected with described smoke absorption system adds system, absorbs slurry spraying system and NOx recovery system, the recovery system of the sulphite being connected with flue gas ash removal concentration systems, the flushing water system being connected with flue gas demister system, also comprises the dense slurry spraying system being connected with absorption slurry spraying system with dedusting concentration systems.
2. tower case 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 flue gas ash removal concentration systems is made up of the concentrated case of dedusting;
Described smoke absorption system is made up of longitudinal combination respiratory box and described respiratory box flue gas interface channel;
Described flue gas demister system is made up of demister, and described demister is provided with one-level demist layer and secondary demist layer;
Described purifying smoke output system is made up of chimney;
Described absorbent adds system to form by absorbing slurries spray thrower in lye tank (vat), lye pump and tower case;
Described absorption slurry spraying system absorbs slurries spray thrower in slurry circulating pump, tower case and forms by absorbing;
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 composition;
Described sulphite recovery system is made up of thickened pulp liquid pump, filter, filtrate receiver and output of products pump;
Described flushing water system is rinsed water layer and secondary demist layer and is rinsed water layer and form by rinsing in tank, flush water pump, tower case one-level demist layer;
Described dense slurry spraying system absorbs liquid pump by underflow liquid spray thrower and dust-laden in underflow liquid pump, the concentrated case of dedusting and forms.
3. tower case flue gas purification system according to claim 2, it is characterized in that: the concentrated upper box part of described dedusting is provided with underflow liquid spray thrower, 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; Lower end, the concentrated case liquid phase region of described dedusting is provided with thickened pulp feeder;
Described smoke absorption system is made up of longitudinal combination respiratory box, a resolution gas body space separating with exhaust gases passes of described respiratory box structure, top is exhaust gases passes, 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 combination respiratory box, the structure of the 1st grade of respiratory box is different from other combination box, the bottom liquid phase region of the 1st respiratory box is provided with weir, lower end is provided with dust-laden slurry collecting groove, and other combination respiratory box bottoms are provided with liquid distributing board, each respiratory box is docking mutually up and down, and the base plate of top box becomes the exhaust gases passes upper sealing plate of nowel, and the liquid of top box directly falls into nowel by liquid distributing board; The exhaust gases passes of respiratory boxs at different levels is connected by flue gas interface channel, and the air pocket of the concentrated case of respiratory boxs at different levels and dedusting is provided with air pocket connector by connecting pipe UNICOM; The top of last 1 grade of respiratory box does not have upper sealing plate, is provided with slurries spray thrower, and flue gas directly enters demister system, and described absorption system and demister system form tower box structure jointly;
Described absorbent adds system and described slurry spraying system to share slurries spray thrower in tower case.
CN201420268008.1U 2014-05-15 2014-05-15 Tower tank fume gas purification system Expired - Fee Related CN203899437U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103961996A (en) * 2014-05-15 2014-08-06 淮南市明月环保科技有限责任公司 Fume purification system with tower box
CN106110837A (en) * 2016-07-20 2016-11-16 邱炎新 Antiknock formula flue gas washing absorption cleaning heat exchange tower

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103961996A (en) * 2014-05-15 2014-08-06 淮南市明月环保科技有限责任公司 Fume purification system with tower box
CN106110837A (en) * 2016-07-20 2016-11-16 邱炎新 Antiknock formula flue gas washing absorption cleaning heat exchange tower
CN106110837B (en) * 2016-07-20 2018-11-16 南通春光自控设备工程有限公司 Antiknock formula flue gas washing absorption cleaning heat exchange tower

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