CN103768911A - Flue gas purification device and method capable of realizing desulfurization, denitrification and respective recovery - Google Patents

Flue gas purification device and method capable of realizing desulfurization, denitrification and respective recovery Download PDF

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CN103768911A
CN103768911A CN201410046954.6A CN201410046954A CN103768911A CN 103768911 A CN103768911 A CN 103768911A CN 201410046954 A CN201410046954 A CN 201410046954A CN 103768911 A CN103768911 A CN 103768911A
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desulfurization
cleaning solution
denitration
collecting region
tower
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汤鲁宏
汤宁
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汤宁
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Abstract

The invention belongs to the technical field of energy conservation and environmental protection, and in particular relates to a flue gas purification device and a flue gas purification method capable of realizing desulfurization, denitrification and respective recovery. The device comprises a multifunctional desulfurization and denitrification tower, a set of desulfurization circulation spraying system and a set of denitrification circulation spraying system, wherein the multifunctional desulfurization and denitrification tower integrates a pre-washing area, a pre-washing liquid collecting area, a desulfurization washing area, a desulfurization washing liquid collecting area, a nitric oxide oxidation area, a denitrification washing area, a denitrification washing liquid collecting area and a demisting area; the set of desulfurization circulation spraying system and the set of denitrification circulation spraying system are matched with the multifunctional desulfurization and denitrification tower. According to the flue gas purification device and the flue gas purification method capable of realizing desulfurization, denitrification and respective recovery, sulfite and nitric oxide are oxidized by a single desulfurization and denitrification tower only through air, so that the flue gas purification investment, the energy consumption and the operation cost are greatly reduced, sulfate and nitrate can be respectively recovered and recycled, waste water and waste slag are no longer generated, secondary pollution is avoided, the denitrification efficiency can be more than 90 percent, and the desulfurization efficiency can be more than 98 percent.

Description

A kind of two de-smoke eliminator and methods that reclaim respectively of sulphur nitre that realize
Technical field
The present invention relates to fire coal boiler fume treatment technology, relate in particular to a kind of two de-smoke eliminator and methods that reclaim respectively of sulphur nitre that realize, belong to energy-conserving and environment-protective technical field.
Background technology
The coal resources of China are very abundant, and coal accounts for ratio that China primary energy produces and consume always more than 70%, and in the very long period, coal will be all one of main source of China's energy from now on.For this reason, we must conscientiously study the resource of the oxysulfide that produces in coal combustion process, nitrogen oxide and recycle problem, strive therefrom obtaining benefit, by the thinking of work and center of gravity from administering SO2 and NO xthe pollution that discharge causes is converted to the SO being produced with in coal burning process 2and NO xfor raw material is engaged in processing, form new growth engines.
There is in this respect a large amount of research reports.CN101053747 is oxidized to NO by hydrogen peroxide or ozone by the NO in flue gas 2then use ammonia absorption, generate the mixed solution of ammonium sulfite, ammonium nitrate and ammonium nilrite, then ammonium sulfite wherein and ammonium nilrite are oxidized to ammonium sulfate and ammonium nitrate with air, flue gas after desulphurization denitration is carried out to demist simultaneously, finally obtain clean flue gas.The ammonium sulfate forming and ammonium nitrate mixed solution, after concentrated, crystallization, being dried, obtain the solid mixture of ammonium sulfate and ammonium nitrate as fertilizer application.Although desulphurization denitration accessory substance last in this technology can be used as fertilizer application, added value is relatively low.CN101337152 by ozone by the SO in flue gas 2with NO simultaneous oxidation be SO 3and N 2o 5, after chance water, generate the mist droplet of sulfuric acid and nitric acid, then be gathered into mix acid liquor after charged coalescence, become sulfuric acid, nitric acid finally by chemical method separating-purifying.The effect of this invention and benefit are to remove at the same time SO in flue gas 2in the process of NO, do not use catalyst, absorbent, do not produce byproduct, environment is not produced to any negative effect, for coal-fired flue gas desulfurization and denitration provides a method of resource.But this technology the unspecified how nitration mixture of sulfuric acid and nitric acid separation, the worker of chemical field knows, very large by the mixed solution separating difficulty of sulfuric acid and nitric acid, and in desulphurization plant, form dilute acid soln, be very large to the corrosivity of equipment, equipment investment and maintenance cost will be very large.CN101485957 discloses desulfurization and denitration has been carried out in two equipment, uses alkali lye the SO in flue gas 2absorption is got off, then with ozone, sulfite oxidation is become to sulfate in liquid phase; In denitration device, with ozone, NO is oxidized to NO 2, then form the mixture of nitrite/nitrate with alkali liquor absorption.Although this technology has realized separating of sulphur resource and nitrogen resource, and desulphurization and denitration is carried out respectively in two equipment, needs two towers of investment construction, equipment investment and operation cost are high more a lot of than single tower process.CN101879404 discloses the flue gas desulfurization and denitration method of other a kind of resource, and it comprises successively: by SO 2and NO xflue gas pass in desulfurizing tower, in desulfurizing tower, SO 2being desulfurized agent (lean solution) absorbs; Absorb SO 2after desulfurizing agent (rich solution) through multi-effect evaporator desorb, discharge SO 2gas is compressed into liquid SO after condensation is dry 2.Flue gas after desulfurization enters in denitrating tower, sprays into the ozone gas from ozone generator, after NO in flue gas is oxidized, absorbs and forms nitrate with denitrfying agent; In solution, nitrate reaches finite concentration post crystallization and separates out, after filtration, the dry nitrate product that to obtain.This invention is the SO in flue gas 2and NO xrespectively with the higher liquid SO of added value 2reclaimed with nitrate product, realize resource, the value maximization of desulphurization denitration process, and can obtain very high desulphurization denitration rate, desulfurization degree is greater than 96%, denitration rate is greater than 90%, and nitrate product purity is greater than 96%.But still needing to belong to double tower process, equipment investment and operation cost are still high a lot of than single tower process.
Summary of the invention
Object of the present invention is exactly will provide a kind of to realize sulphur nitre two smoke eliminator and methods de-, that reclaim respectively at Dan Tazhong.Adopt these apparatus and method can effectively improve the desulphurization and denitration efficiency of flue gas and the utilization rate of desulphurization denitration absorbent, and its technological process is simple, system architecture simplification, investment and operating cost cheap, desulphurization denitration byproduct is ammonium sulfate and the nitrate fertilizer that resourcebility utilizes, desulphurization denitration list tower completes, sulphite and nitric oxide production oxidation can be only with air, and no longer produce waste water and dregs, cause secondary pollution, and can reach desulfuration efficiency more than more than 90% denitration efficiency and 98%.
For achieving the above object, the two de-smoke eliminators that reclaim respectively of the sulphur realized nitre that the present invention is designed, are made up of multi-functional desulphurization denitration tower and supporting desulphurization circulating spray system, denitration circulated sprinkling system etc.; Multi-functional desulphurization denitration tower forms by pre-wash district, pre-wash liquid collecting region, desulfurization scrubbing section, desulfurization cleaning solution collecting region, oxidation of nitric oxide district, denitration scrubbing section, denitration cleaning solution collecting region with except fog-zone.
Pre-wash district is wherein positioned at a side on tower body top, is horn mouth vertical venturi tubulose down, and pre-wash liquid sprays into enhancing mass and heat transfer effect in throat.The lower side in pre-wash district communicates with desulfurization scrubbing section, and bottom is connected with pre-wash liquid collecting region by liquid sealing pipe A; Pre-wash liquid collecting region is positioned at the bottom of tower body, under liquid sealing pipe A, be an opened upper end, opening up horn-like groove, be connected with pre-wash district by liquid sealing pipe A, communicate with desulfurization cleaning solution collecting region by upper space, to the tower wall of desulfurization cleaning solution collecting region, be provided with an ammonium sulfate output auger along horn-like groove from bottom; Desulfurization scrubbing section is positioned at the bottom of tower body, is the horizontal tunnel shape with deflection plate, and both sides communicate with pre-wash district and oxidation of nitric oxide district respectively, and bottom is connected with desulfurization cleaning solution collecting region by liquid sealing pipe B; Desulfurization cleaning solution collecting region is positioned at the bottom of tower body, be connected with desulfurization scrubbing section by liquid sealing pipe B, communicate with desulfurization cleaning solution collecting region by upper space, communicate with oxidation of nitric oxide district by air grid, have desulphurization circulating pump interface near bottom, the place that exceeds the tubaeform groove of pre-wash liquid collecting region has the outlet of ammonium sulfate output auger, inside connects ammonium sulfate output auger, the bottom along flared channels oblique cutting to pre-wash liquid collecting region; Oxidation of nitric oxide district by desulfurization cleaning solution collecting region air grid upper gas passage, be positioned at the horizontal tunnel at tower body middle part and be positioned at the same side, pre-wash district, tower body top, spatial composing between tower wall and Venturi tube, communicate with desulfurization scrubbing section, desulfurization cleaning solution collecting region and denitration scrubbing section, on horizontal tunnel tower wall, have air inlet; Denitration scrubbing section is positioned at tower body top opposite side, be the horizontal tunnel shape of sandwich tape deflection plate, two ends communicate with He Chu fog-zone, oxidation of nitric oxide district respectively, bottom is open type denitration cleaning solution collecting region, and denitration cleaning solution collecting region has denitration circulating pump interface and denitration cleaning solution overfall from bottom to top near bottom; Demist district is positioned at the top of tower body.
The designed device of the present invention be tower body arrange desulphurization circulating spray and denitration circulated sprinkling two overlap separate, the system of isolated operation separately.Desulphurization circulating spray system is made up of throat's nozzle in pre-wash district, spray equipment and the desulfuration recycle pump of desulfurization scrubbing section.Throat's nozzle in pre-wash district, the spray equipment parallel connection of desulfurization scrubbing section, share a desulfuration recycle pump.Throat's nozzle (spray equipment of desulfurization scrubbing section) in desulfurization cleaning solution collecting region, desulfuration recycle pump and pre-wash district is connected successively by pipeline.The pH value of desulfurization cleaning solution regulates at desulfurization cleaning solution collecting region, desulfurization cleaning solution collecting region be connected successively by pipeline containing ammonia alkali liquid delivery pump, containing ammonia alkali liquid source.The required water of water balance is delivered directly to desulfurization scrubbing section to carry out flue and directly sprays.The water spray system of desulfurization scrubbing section is connected by pipeline successively with water pump, water source.The oxidation of desulfurization cleaning solution is carried out at desulfurization cleaning solution collecting region, and desulfurization cleaning solution collecting region is connected by pipeline successively with main air blower.Nitric oxide production oxidation is carried out in oxidation of nitric oxide district, and oxidation of nitric oxide district is connected by pipeline successively with accessory fan, oxidizer source.Denitration circulated sprinkling system is made up of spray equipment and the denitration circulating pump of denitration scrubbing section.Denitration cleaning solution collecting region, denitration circulating pump and the spray equipment of denitration scrubbing section are connected successively by pipeline.The required alkali lye of denitration is delivered directly to denitration scrubbing section to carry out flue and directly sprays.The alkali lye spray equipment of denitration scrubbing section is connected by pipeline successively with alkali lye delivery pump, alkali lye source.Desulfurization product ammonium sulfate, with the form collection of the solid that wets, is exported auger at pre-wash liquid collecting region by ammonium sulfate and is carried out.Denitration product nitrate, with the form collection of solution, carries out at denitration cleaning solution collecting region, and denitration cleaning solution overfall connects by pipeline with denitration cleaning solution storage tank.
The two de-flue gas purifying methods that reclaim respectively of the sulphur the realized nitre take said apparatus as basis that the present invention is designed, comprise the following steps:
1) enter in tower through the boiler smoke of dust removal process, directly contact with desulfurization cleaning solution in pre-wash district, heat and mass, all reaches between 60~90 ℃ the temperature of boiler smoke and desulfurization cleaning solution., also large quantity of moisture is evaporated in boiler smoke meanwhile, makes the humidity of boiler smoke reach closely saturated, in desulfurization cleaning solution, the concentration of ammonium sulfate reaches supersaturation, obtains Low Temperature Wet flue gas and pre-wash and collects liquid.
2) pre-wash is collected liquid and is entered pre-wash liquid collecting region, wriggling from bottom to top flow through in journey and made crystallization constantly collide aggegation change greatly, be sink to bottom, outside ammonium sulfate output auger extraction tower, go to be dried processing, mother liquor overflow, to desulfurization cleaning solution collecting region, mixes and is oxidized, adjusts an operation such as pH and circulated sprinkling with desulfurization washing collection liquid.Low Temperature Wet flue gas enters desulfurization scrubbing section, and contained sulfur dioxide is desulfurized cleaning solution and water is absorbed into liquid phase, obtains not wet flue gas and the desulfurization washing of sulfur-bearing and collects liquid.The wet flue gas of sulfur-bearing does not flow to oxidation of nitric oxide district, and desulfurization washing is collected liquid and entered desulfurization cleaning solution collecting region.
3) pass into air to desulfurization cleaning solution collecting region, sulfite oxidation is become to stable ammonium sulfate at the temperature of 60~80 ℃, the intake of air by institute's sulfur-bearing in oxygen containing molar flow wherein and flue gas be 1.1~2.0 with the ratio of total molar flow of nitrogen; Pump into Ammonia alkali lye to desulfurization cleaning solution collecting region, the pH of desulfurization cleaning solution is controlled to 6.5~7.0, recycle.Air enters oxidation of nitric oxide district through top grid.
4) from accessory fan input gaseous oxidant, the intake of gaseous oxidant by the ratio of molar flow nitrogenous in oxygen containing molar flow wherein and flue gas be 0~0.3, together with the air from desulfurization cleaning solution collecting region together, mix with the wet flue gas of sulfur-bearing not, be nitrogen dioxide by wherein contained oxidation of nitric oxide, obtain nitrogen dioxide flue gas.
5) nitrogen dioxide flue gas enters denitration scrubbing section, and contained nitrogen dioxide is entered liquid phase by denitration cleaning solution and alkali liquor absorption, obtains neither sulfur-bearing also
Liquid is collected in unazotized clean wet flue gas and denitration washing.Clean wet flue gas, through except fog-zone demist, enters atmosphere.Liquid is collected in denitration washing
Constantly recycle, after reaching finite concentration, flow out outside tower from overfall, go to concentrate, crystallization and dry processing.
Described gaseous oxidant can be ozone, can be also oxygen, or air.Described Ammonia alkali lye is liquefied ammonia, ammoniacal liquor, ammonium bicarbonate aqueous solution or aqueous solution of urea.Described alkali lye is wherein at least one the aqueous solution or suspension of NaOH, sodium carbonate, sodium acid carbonate, potassium hydroxide, potash, saleratus, calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide or magnesia.
Compared with prior art, the invention has the advantages that:
One, the present invention in a tower, has simplified technological process by the desulphurization and denitration process integration of flue gas, has reduced the floor space of equipment, has significantly reduced investment and the operating cost of equipment.
They are two years old, the present invention combines the evaporation and concentration of the cooling of flue gas, humidification and cleaning dust and desulfurization cleaning solution, and in the bottom design of tower body special pre-wash liquid collecting region, for ammonium sulfate crystallization, make full use of fume afterheat and carry out evaporation and concentration, in tower, obtain ammonium sulfate crystallization, significantly reduced energy consumption and operating cost.
They are three years old, the present invention adopts secondary air method to carry out nitric oxide production oxidation, both the air passing into while making full use of sulfite oxidation, save the consumption of oxidant, energy consumption and corresponding investment and operating cost are significantly reduced, guarantee again nitric oxide production exhaustive oxidation, thereby obtained more than 90% denitration efficiency.
They are four years old, the present invention is designed to not use two of same alkali independently processes by desulfurization with denitration, desulfurization adopts ammonia process, take ammonium sulfate fertilizer as product, denitration adopts calcium, magnesium, sodium, the non-volatile alkaline process such as potassium, take nitrate fertilizer as product, guaranteeing that desulfuration efficiency reaches more than 98%, when denitration efficiency reaches more than 90%, solve the escaping of ammonia, the difficult problem that the existing smoke gas treatment technology such as calcium obstruction face, the ammonium sulfate obtaining and nitrate are has bright market prospects, meet especially the chemical fertilizer of China as the national conditions of large agricultural country, realize the recycling of desulphurization denitration product, effectively avoid secondary pollution.
In sum, the present invention has that investment is little, energy consumption is low, technique and system is simple, operating cost is low, absorbent utilization rate is high, reliable, denitrification efficiency high, its desulfuration efficiency can reach more than 98%, denitration efficiency can reach more than 90%, and treated clean flue gas meets the discharge standard of country about sulfur dioxide and nitrogen oxide completely.
Accompanying drawing explanation
Accompanying drawing is a kind of structural representation of realizing the two de-smoke eliminators that reclaim respectively of sulphur nitre.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of fire coal boiler fume is made up of multi-functional desulphurization denitration tower and supporting desulphurization circulating spray system, denitration circulated sprinkling system etc. with realizing the two de-smoke eliminators that reclaim respectively of sulphur nitre; Multi-functional desulphurization denitration tower forms by pre-wash district, pre-wash liquid collecting region, desulfurization scrubbing section, desulfurization cleaning solution collecting region, oxidation of nitric oxide district, denitration scrubbing section, denitration cleaning solution collecting region with except fog-zone.
Pre-wash district is wherein positioned at a side on tower body top, is horn mouth vertical venturi tubulose down, and pre-wash liquid sprays into enhancing mass and heat transfer effect in throat.The lower side in pre-wash district communicates with desulfurization scrubbing section, and bottom is connected with pre-wash liquid collecting region by liquid sealing pipe A;
Pre-wash liquid collecting region is positioned at the bottom of tower body, under liquid sealing pipe A, be an opened upper end, opening up horn-like groove, be connected with pre-wash district by liquid sealing pipe A, communicate with desulfurization cleaning solution collecting region by upper space, to the tower wall of desulfurization cleaning solution collecting region, be provided with an ammonium sulfate output auger along horn-like groove from bottom;
Desulfurization scrubbing section is positioned at the bottom of tower body, is the horizontal tunnel shape with deflection plate, and both sides communicate with pre-wash district and oxidation of nitric oxide district respectively, and bottom is connected with desulfurization cleaning solution collecting region by liquid sealing pipe B;
Desulfurization cleaning solution collecting region is positioned at the bottom of tower body, be connected with desulfurization scrubbing section by liquid sealing pipe B, communicate with desulfurization cleaning solution collecting region by upper space, communicate with oxidation of nitric oxide district by air grid, have desulphurization circulating pump interface near bottom, the place that exceeds the tubaeform groove of pre-wash liquid collecting region has the outlet of ammonium sulfate output auger, inside connects ammonium sulfate output auger, the bottom along flared channels oblique cutting to pre-wash liquid collecting region;
Oxidation of nitric oxide district by desulfurization cleaning solution collecting region air grid upper gas passage, be positioned at the horizontal tunnel at tower body middle part and be positioned at the same side, pre-wash district, tower body top, spatial composing between tower wall and Venturi tube, communicate with desulfurization scrubbing section, desulfurization cleaning solution collecting region and denitration scrubbing section, on horizontal tunnel tower wall, have air inlet;
Denitration scrubbing section is positioned at tower body top opposite side, be the horizontal tunnel shape of sandwich tape deflection plate, two ends communicate with He Chu fog-zone, oxidation of nitric oxide district respectively, bottom is open type denitration cleaning solution collecting region, and denitration cleaning solution collecting region has denitration circulating pump interface and denitration cleaning solution overfall from bottom to top near bottom; Demist district is positioned at the top of tower body.
The designed device of the present invention be tower body arrange desulphurization circulating spray and denitration circulated sprinkling two overlap separate, the system of isolated operation separately.
Desulphurization circulating spray system is made up of throat's nozzle in pre-wash district, spray equipment and the desulfuration recycle pump of desulfurization scrubbing section.Throat's nozzle in pre-wash district, the spray equipment parallel connection of desulfurization scrubbing section, share a desulfuration recycle pump.Throat's nozzle (spray equipment of desulfurization scrubbing section) in desulfurization cleaning solution collecting region, desulfuration recycle pump and pre-wash district is connected successively by pipeline.Desulfurization cleaning solution ph value regulates at desulfurization cleaning solution collecting region, desulfurization cleaning solution collecting region be connected successively by pipeline containing ammonia alkali liquid delivery pump, containing ammonia alkali liquid source.The required water of water balance is delivered directly to desulfurization scrubbing section to carry out flue and directly sprays.The water spray system of desulfurization scrubbing section is connected by pipeline successively with water pump, water source.
The oxidation of desulfurization cleaning solution is carried out at desulfurization cleaning solution collecting region, and desulfurization cleaning solution collecting region is connected by pipeline successively with main air blower.Nitric oxide production oxidation is carried out in oxidation of nitric oxide district, and oxidation of nitric oxide district is connected by pipeline successively with accessory fan, oxidizer source.
Denitration circulated sprinkling system is made up of spray equipment and the denitration circulating pump of denitration scrubbing section.Denitration cleaning solution collecting region, denitration circulating pump and the spray equipment of denitration scrubbing section are connected successively by pipeline.The required alkali lye of denitration is delivered directly to denitration scrubbing section to carry out flue and directly sprays.The alkali lye spray equipment of denitration scrubbing section is connected by pipeline successively with alkali lye delivery pump, alkali lye source.
Desulfurization product ammonium sulfate, with the form collection of the solid that wets, is exported auger at pre-wash liquid collecting region by ammonium sulfate and is carried out.Denitration product nitrate, with the form collection of solution, carries out at denitration cleaning solution collecting region, and denitration cleaning solution overfall connects by pipeline with denitration cleaning solution storage tank.
The two de-flue gas purifying methods that reclaim respectively of the sulphur the realized nitre take said apparatus as basis that the present invention is designed, comprise the following steps:
1) enter in tower through the boiler smoke of dust removal process, directly contact with desulfurization cleaning solution in pre-wash district, heat and mass, all reaches between 60~90 ℃ the temperature of boiler smoke and desulfurization cleaning solution., also large quantity of moisture is evaporated in boiler smoke meanwhile, makes the humidity of boiler smoke reach closely saturated, in desulfurization cleaning solution, the concentration of ammonium sulfate reaches supersaturation, obtains Low Temperature Wet flue gas and pre-wash and collects liquid.
2) pre-wash is collected liquid and is entered pre-wash liquid collecting region, wriggling from bottom to top flow through in journey and made crystallization constantly collide aggegation change greatly, be sink to bottom, outside ammonium sulfate output auger extraction tower, go to be dried processing, mother liquor overflow, to desulfurization cleaning solution collecting region, mixes and is oxidized, adjusts an operation such as pH and circulated sprinkling with desulfurization washing collection liquid.Low Temperature Wet flue gas enters desulfurization scrubbing section, and contained sulfur dioxide is desulfurized cleaning solution and water is absorbed into liquid phase, obtains not wet flue gas and the desulfurization washing of sulfur-bearing and collects liquid.The wet flue gas of sulfur-bearing does not flow to oxidation of nitric oxide district, and desulfurization washing is collected liquid and entered desulfurization cleaning solution collecting region.
3) pass into air to desulfurization cleaning solution collecting region, sulfite oxidation is become to stable ammonium sulfate at the temperature of 60~80 ℃, the intake of air by institute's sulfur-bearing in oxygen containing molar flow wherein and flue gas be 1.1~2.0 with the ratio of total molar flow of nitrogen; Pump into Ammonia alkali lye to desulfurization cleaning solution collecting region, the pH of desulfurization cleaning solution is controlled to 6.5~7.0, recycle.Air enters oxidation of nitric oxide district through top grid.
4) from accessory fan input gaseous oxidant, the intake of gaseous oxidant by the ratio of molar flow nitrogenous in oxygen containing molar flow wherein and flue gas be 0~0.3, together with the air from desulfurization cleaning solution collecting region together, mix with the wet flue gas of sulfur-bearing not, be nitrogen dioxide by wherein contained oxidation of nitric oxide, obtain nitrogen dioxide flue gas.
5) nitrogen dioxide flue gas enters denitration scrubbing section, and contained nitrogen dioxide is entered liquid phase by denitration cleaning solution and alkali liquor absorption, obtains neither also unazotized clean wet flue gas and denitration washing collection liquid of sulfur-bearing.Clean wet flue gas, through except fog-zone demist, enters atmosphere.Denitration washing is collected liquid and is constantly recycled, and after reaching finite concentration, outside overfall flows out tower, goes to concentrate, crystallization and dry processing.
Described gaseous oxidant can be ozone, can be also oxygen, or air.Described Ammonia alkali lye is liquefied ammonia, ammoniacal liquor, ammonium bicarbonate aqueous solution or aqueous solution of urea.Described alkali lye is wherein at least one the aqueous solution or suspension of NaOH, sodium carbonate, sodium acid carbonate, potassium hydroxide, potash, saleratus, calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide or magnesia.
Detailed process is: first flue gas is cooled to 90 ℃ through pre-wash district, then enters desulfurization scrubbing section easily molten sulfur dioxide is removed, and absorption liquid is Ammonia alkali lye, and it is ammonium sulfate by sulfite oxidation that air passes into desulfurization cleaning solution collecting region, follow from the air of desulfurization cleaning solution collecting region and mix through the flue gas of desulfurization scrubbing section, enter oxidation of nitric oxide district, spray into part ozone by accessory fan to oxidation of nitric oxide district simultaneously, pure oxygen or air, nitrogen oxide after oxidation carries out denitration by denitration scrubbing section, absorption liquid is calcium, magnesium, sodium, the solution of the non-volatile bases such as potassium or suspension, absorption liquid recycles, ammonium sulfate can form crystallization at pre-wash liquid collecting region, outside ammonium sulfate output auger extraction tower, nitrate overflows outside tower certainly with the form of solution, be collected in device and after processing, sell or further process.
Finally, it is also to be noted that, what more than enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.
The present invention can summarize with other the concrete form without prejudice to spirit of the present invention and principal character.Therefore, no matter from which point, above-mentioned embodiment of the present invention all can only think explanation of the present invention can not limit the present invention, claims have been pointed out scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore, any change in implication and the scope suitable with claims of the present invention, all should think to be included in the scope of claims.

Claims (8)

1. can realize the two de-smoke eliminators that reclaim respectively of sulphur nitre, it is characterized in that, this device is made up of multi-functional desulphurization denitration tower and supporting desulphurization circulating spray system, denitration circulated sprinkling system etc.; Multi-functional desulphurization denitration tower forms by pre-wash district, pre-wash liquid collecting region, desulfurization scrubbing section, desulfurization cleaning solution collecting region, oxidation of nitric oxide district, denitration scrubbing section, denitration cleaning solution collecting region with except fog-zone.
2. the two de-smoke eliminators that reclaim respectively of sulphur nitre of realizing as claimed in claim 1, it is characterized in that, pre-wash district is positioned at a side on tower body top, is horn mouth vertical venturi tubulose down, and pre-wash liquid sprays into enhancing mass and heat transfer effect in throat.The lower side in pre-wash district communicates with desulfurization scrubbing section, and bottom is connected with pre-wash liquid collecting region by liquid sealing pipe A; Pre-wash liquid collecting region is positioned at the bottom of tower body, under liquid sealing pipe A, be an opened upper end, opening up horn-like groove, be connected with pre-wash district by liquid sealing pipe A, communicate with desulfurization cleaning solution collecting region by upper space, to the tower wall of desulfurization cleaning solution collecting region, be provided with an ammonium sulfate output auger along horn-like groove from bottom; Desulfurization scrubbing section is positioned at the bottom of tower body, is the horizontal tunnel shape with deflection plate, and both sides communicate with pre-wash district and oxidation of nitric oxide district respectively, and bottom is connected with desulfurization cleaning solution collecting region by liquid sealing pipe B; Desulfurization cleaning solution collecting region is positioned at the bottom of tower body, be connected with desulfurization scrubbing section by liquid sealing pipe B, communicate with desulfurization cleaning solution collecting region by upper space, communicate with oxidation of nitric oxide district by air grid, have desulphurization circulating pump interface near bottom, the place that exceeds the tubaeform groove of pre-wash liquid collecting region has the outlet of ammonium sulfate output auger, inside connects ammonium sulfate output auger, the bottom along flared channels oblique cutting to pre-wash liquid collecting region; Oxidation of nitric oxide district by desulfurization cleaning solution collecting region air grid upper gas passage, be positioned at the horizontal tunnel at tower body middle part and be positioned at the same side, pre-wash district, tower body top, spatial composing between tower wall and Venturi tube, communicate with desulfurization scrubbing section, desulfurization cleaning solution collecting region and denitration scrubbing section, on horizontal tunnel tower wall, have air inlet; Denitration scrubbing section is positioned at tower body top opposite side, be the horizontal tunnel shape of sandwich tape deflection plate, two ends communicate with He Chu fog-zone, oxidation of nitric oxide district respectively, bottom is open type denitration cleaning solution collecting region, and denitration cleaning solution collecting region has denitration circulating pump interface and denitration cleaning solution overfall from bottom to top near bottom; Demist district is positioned at the top of tower body.
3. the two de-smoke eliminators that reclaim respectively of sulphur nitre of realizing as claimed in claim 1, is characterized in that, tower body arrange desulphurization circulating spray and denitration circulated sprinkling two overlap separate, the system of isolated operation separately.Desulphurization circulating spray system is made up of throat's nozzle in pre-wash district, spray equipment and the desulfuration recycle pump of desulfurization scrubbing section.Throat's nozzle in pre-wash district, the spray equipment parallel connection of desulfurization scrubbing section, share a desulfuration recycle pump.Throat's nozzle (spray equipment of desulfurization scrubbing section) in desulfurization cleaning solution collecting region, desulfuration recycle pump and pre-wash district is connected successively by pipeline.The pH value of desulfurization cleaning solution regulates at desulfurization cleaning solution collecting region, desulfurization cleaning solution collecting region be connected successively by pipeline containing ammonia alkali liquid delivery pump, containing ammonia alkali liquid source.The required water of water balance is delivered directly to desulfurization scrubbing section to carry out flue and directly sprays.The water spray system of desulfurization scrubbing section is connected by pipeline successively with water pump, water source.The oxidation of desulfurization cleaning solution is carried out at desulfurization cleaning solution collecting region, and desulfurization cleaning solution collecting region is connected by pipeline successively with main air blower.Nitric oxide production oxidation is carried out in oxidation of nitric oxide district, and oxidation of nitric oxide district is connected by pipeline successively with accessory fan, oxidizer source.Denitration circulated sprinkling system is made up of spray equipment and the denitration circulating pump of denitration scrubbing section.Denitration cleaning solution collecting region, denitration circulating pump and the spray equipment of denitration scrubbing section are connected successively by pipeline.The required alkali lye of denitration is delivered directly to denitration scrubbing section to carry out flue and directly sprays.The alkali lye spray equipment of denitration scrubbing section is connected by pipeline successively with alkali lye delivery pump, alkali lye source.
4. the two de-smoke eliminators that reclaim respectively of sulphur nitre of realizing as claimed in claim 1, is characterized in that, desulfurization product ammonium sulfate, with the form collection of the solid that wets, is exported auger at pre-wash liquid collecting region by ammonium sulfate and carried out.Denitration product nitrate, with the form collection of solution, carries out at denitration cleaning solution collecting region, and denitration cleaning solution overfall connects by pipeline with denitration cleaning solution storage tank.
5. the two de-flue gas purifying methods that reclaim respectively of the sulphur the realized nitre based on device described in claim 1, is characterized in that, comprise the following steps:
1) enter in tower through the boiler smoke of dust removal process, directly contact with desulfurization cleaning solution in pre-wash district, heat and mass, all reaches between 60~90 ℃ the temperature of boiler smoke and desulfurization cleaning solution., also large quantity of moisture is evaporated in boiler smoke meanwhile, makes the humidity of boiler smoke reach closely saturated, in desulfurization cleaning solution, the concentration of ammonium sulfate reaches supersaturation, obtains Low Temperature Wet flue gas and pre-wash and collects liquid.
2) pre-wash is collected liquid and is entered pre-wash liquid collecting region, wriggling from bottom to top flow through in journey and made crystallization constantly collide aggegation change greatly, be sink to bottom, outside ammonium sulfate output auger extraction tower, go to be dried processing, mother liquor overflow, to desulfurization cleaning solution collecting region, mixes and is oxidized, adjusts an operation such as pH and circulated sprinkling with desulfurization washing collection liquid.Low Temperature Wet flue gas enters desulfurization scrubbing section, and contained sulfur dioxide is desulfurized cleaning solution and water is absorbed into liquid phase, obtains not wet flue gas and the desulfurization washing of sulfur-bearing and collects liquid.The wet flue gas of sulfur-bearing does not flow to oxidation of nitric oxide district, and desulfurization washing is collected liquid and entered desulfurization cleaning solution collecting region.
3) pass into air to desulfurization cleaning solution collecting region, sulfite oxidation is become to stable ammonium sulfate at the temperature of 60~80 ℃, the intake of air by institute's sulfur-bearing in oxygen containing molar flow wherein and flue gas be 1.1~2.0 with the ratio of total molar flow of nitrogen; Pump into Ammonia alkali lye to desulfurization cleaning solution collecting region, the pH of desulfurization cleaning solution is controlled to 6.5~7.0, recycle.Air enters oxidation of nitric oxide district through top grid.
4) from accessory fan input gaseous oxidant, together with the air from desulfurization cleaning solution collecting region together, mix with the wet flue gas of sulfur-bearing not, be nitrogen dioxide by wherein contained oxidation of nitric oxide, obtain nitrogen dioxide flue gas.
5) nitrogen dioxide flue gas enters denitration scrubbing section, and contained nitrogen dioxide is entered liquid phase by denitration cleaning solution and alkali liquor absorption, obtains neither also unazotized clean wet flue gas and denitration washing collection liquid of sulfur-bearing.Clean wet flue gas, through except fog-zone demist, enters atmosphere.Denitration washing is collected liquid and is constantly recycled, and after reaching finite concentration, outside overfall flows out tower, goes to concentrate, crystallization and dry processing.
6. the two de-flue gas purifying methods that reclaim respectively of sulphur nitre of realizing as claimed in claim 5, is characterized in that, described gaseous oxidant can be ozone, can be also oxygen, or air.
7. the two de-flue gas purifying methods that reclaim respectively of sulphur nitre of realizing as claimed in claim 5, is characterized in that, described Ammonia alkali lye is liquefied ammonia, ammoniacal liquor, ammonium bicarbonate aqueous solution or aqueous solution of urea.
8. the two de-flue gas purifying methods that reclaim respectively of sulphur nitre of realizing as claimed in claim 5, it is characterized in that, described alkali lye is wherein at least one the aqueous solution or suspension of NaOH, sodium carbonate, sodium acid carbonate, potassium hydroxide, potash, saleratus, calcium hydroxide, calcium oxide, calcium carbonate, magnesium hydroxide or magnesia.
CN201410046954.6A 2014-02-11 2014-02-11 Flue gas purification device and method capable of realizing desulfurization, denitrification and respective recovery Pending CN103768911A (en)

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CN105237054A (en) * 2014-09-25 2016-01-13 赵长臣 Method for extracting organic fertilizer and purifying air
CN106039955A (en) * 2016-08-05 2016-10-26 郑顺平 Flue gas treatment device
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CN102553428A (en) * 2012-01-10 2012-07-11 华北电力大学(保定) Absorption tower for desulfurization and denitrification combined with oxidant in forward-flow and back-flow spraying and method
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