CN109331649A - Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process - Google Patents

Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process Download PDF

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Publication number
CN109331649A
CN109331649A CN201811401019.1A CN201811401019A CN109331649A CN 109331649 A CN109331649 A CN 109331649A CN 201811401019 A CN201811401019 A CN 201811401019A CN 109331649 A CN109331649 A CN 109331649A
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flue gas
temperature
low
coke oven
semi
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李帅俊
张效伟
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Qingdao Tianzheng Jieneng Environmental Protection Technology Co Ltd
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Qingdao Tianzheng Jieneng Environmental Protection Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456Removing acid components
    • B01D53/1481Removing sulfur dioxide or sulfur trioxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493Selection of liquid materials for use as absorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2252/00Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10Inorganic absorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The present invention relates to a kind of coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its processes, belong to flue gas and need purification device technical field.The present invention includes the coke oven being sequentially connected by flue, semi-dry desulphurization tower, bag filter, SCR reactor, air-introduced machine and chimney, rotary atomizer is installed on semi-dry desulphurization top of tower, tower bottom unloading valve is installed at semi-dry desulphurization tower the taper bucket, bag filter bottom is equipped with screw conveyor, it is connect by drag conveyor and bucket elevator with grey library, the lower part Hui Ku ash bucket is provided with unloading valve.The present invention uses rotating spraying semi-dry desulphurization technology, non-wastewater discharge, and desulfurization slag has stable market channel, thoroughly solves environmental issue;Discharge is without white haze trailing phenomenon;Improve the service life of low temperature catalyst.The present invention can be widely used in flue gas and need purification device occasion, be particularly suitable for the low-temperature denitrations such as coke oven, waste incinerator, Industrial Stoves, desulfurization and dedusting field.

Description

Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process
Technical field
The present invention relates to a kind of coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its processes, belong to Flue gas needs purification device technical field.
Background technique
The coke oven flue gas in the production of country's coking industry coke oven for coke oven heating summarizes meeting by main chimney flue at present It is discharged directly to the atmosphere by chimney.The atmosphere pollution of coke oven smoke stack emission is the exhaust gas generated after coke-stove gas burns, main There is SO2、NOxAnd flue dust etc., pollutant are to pollute one of industry the most serious in organized overhead point source continuity discharge.
In June, 2012, Environmental Protection Department and national quality supervision and inspection Quarantine Bureau, which combine, has issued " coking chemistry industry dirt Contaminate object discharge standard " (GB16171-2012), the clear stipulaties atmosphere pollutants emission standards of coking industry.The year two thousand twenty Shandong It is higher to save regional Air Pollutant Emission comprehensive standard (DB37/2376-2013) the 4th period key area emission request.It wants Seek regulation SO2Concentration of emission≤50mg/Nm3、NOxConcentration of emission≤100mg/Nm3, granular material discharged concentration≤10mg/Nm3
Coke oven construction is more special, different from traditional coal-burning boiler, and coke oven flue gas and coal-fired electric generation furnace Gas phase Smoke ratio Make a marked difference feature, for example coke oven flue gas sulfur dioxide concentration is relatively low, and nitrous oxides concentration is relatively high, flue gas Middle dust content is low, but moisture content height etc..And coke oven exit gas temperature is different from coal-burning boiler, coke oven exiting flue gas temperature Degree between 230~300 DEG C, at coal-burning boiler coal economizer flue-gas temperature between 300~400 DEG C, fire box temperature 850~ Between 1100 DEG C.Traditional SNCR denitration technology reaction temperature window is between 850~1000 DEG C, traditional SCR denitration technology reaction Temperature window is between 320~410 DEG C, and traditional SNCR+SCR denitration technology is widely used in coal-burning boiler at present, and denitration efficiency is high Up to 95%, but since coke oven flue gas temperature is relatively low, and coke oven furnace type structure is more special, traditional SNCR, SCR denitration skill Art is not used to coke oven flue gas denitration improvement.Had developed some low-temperature denitration technologies now, as oxidizing process (oxidant: Ozone, hydrogen peroxide and sodium hypochlorite etc.) denitration technology and low temperature SCR denitration technology, oxidizing process denitration technology operating cost is high, and Nitrous oxides concentration is higher in coke oven flue gas, and oxidizing process denitration technology is unsuitable for coke oven flue gas denitration process, it has been developed that SCR Low temperature catalyst can carry out denitration between 160~300 DEG C, but since low temperature catalyst resistance to SO_2 is excessively poor, low temperature is urged Agent requires sulfur dioxide concentration≤50mg/Nm3If sulfur dioxide concentration is excessively high, when using SCR denitration technology, catalyst It can make SO in flue gas2It is oxidized to SO3, SO3It is reacted with the ammonia of penetrating, generates sulfate of ammoniac or hydrogen sulfate ammonia, sulfate of ammoniac and sulfuric acid Hydrogen ammonia can be attached to catalyst and show that catalyst is caused to lose activity.The formation of sulfate of ammoniac and hydrogen sulfate ammonia is reversible, flue gas Temperature is higher than 280 DEG C, the sulfate of ammoniac distillation that can make.Flue-gas temperature is higher than 316 DEG C, the hydrogen sulfate ammonia distillation that can make.This It is the reason of coal-burning boiler tradition SCR denitration requires temperature window to be 320-400 DEG C.
1300 DEG C of coke oven combustion room temperature or so, tar in coke-stove gas high-temperature condition can completely burned, normally In the case of, tar should not in flue gas or content is very low.Present coal chemical enterprise is likely to result in carbon due to longtime running Change room and combustion chamber string leak, to will cause, tar content in flue gas is excessively high, tar be to the failure of catalyst it is irreversible, such as Fruit carbonizing chamber and combustion chamber string leakage will return and generate very huge economic loss to enterprise.
Had some enterprises at present using low temperature SCR denitration technology+Wet Flue Gas Desulfurization Technique, all due to catalyst poisoning and It ends in failure, although wet desulphurization is more high-efficient than dry method and semi-dry desulphurization, investment and operating cost are very high, simultaneously A large amount of waste water can be generated, and sulfur dioxide concentration is relatively low in coke oven flue gas, 200~250mg/ of SO 2 from fume concentration Nm3, wet desulphurization should not be used.Therefore, it studies a kind of suitable for the desulfurization of coke oven flue gas, dedusting and denitrating technique device, tool There is boundless Social benefit and economic benefit.
Summary of the invention
In view of the foregoing defects the prior art has, the invention proposes a kind of coke oven flue gas semi-dry desulphurization, dedusting and Low-temperature denitration device and its process.
Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device of the present invention, including pass through flue successively phase Coke oven even, semi-dry desulphurization tower, bag filter, SCR reactor, air-introduced machine and chimney, rotary atomizer are installed on half-dried At the top of method desulfurizing tower, tower bottom unloading valve is installed at semi-dry desulphurization tower the taper bucket, bag filter bottom is equipped with spiral transferring Machine is sent, is connect by drag conveyor and bucket elevator with grey library, the lower part Hui Ku ash bucket is provided with unloading valve;It further include absorbing Agent preparation system and ammonia feed system, absorbent preparation system include absorbent powder cabin, spiral metering scale, the work being sequentially connected Skill water tank, technique water pump, pulping tank, slurry can and slurry feeding pump, rotary atomizer are connect with slurry feeding pump by pipeline; Ammonia feed system includes ammonia water tank, aqua ammonia pump and ammonium hydroxide evaporation mixer, and ammonia water tank is by aqua ammonia pump and ammonium hydroxide evaporation mixing Device is connect with SCR reactor inlet flue.
Preferably, low temperature catalyst built in SCR reactor, low temperature catalyst is made of several catalyst modules, several to urge Agent module is arranged in SCR reactor by steel bracket.
Preferably, the low temperature catalyst uses cellular structure.
Preferably, the flue-gas temperature of the low temperature catalyst processing nitrogen-containing oxide is 120 DEG C~230 DEG C.
The process of coke oven flue gas semi-dry desulphurization of the present invention, dedusting and low-temperature denitration device, including it is as follows Step:
Step 1: the coke oven flue gas come out from coke oven tail portion is sent into inside desulfurizing tower by flue, and absorbent slurry is by pumping Squeeze into the rotary atomizer being located at the top of absorption tower;
Step 2: in absorption tower, the absorbent and flue gas for being atomized into fine drop are mixed, in flue gas SO2Chemical reaction occurs and generates sulfate, the SO in flue gas2It is removed, at the same time, the moisture that absorbent is brought into is steamed rapidly It sends out and dries, flue-gas temperature decreases;
Step 3: desulfurization reaction product and a small amount of unemployed desulfurization absorbent a part go out from desulfurizing tower bottom cone Mouth discharge, a part take absorption tower out of with flue gas in the form of dry particulate matter, are collected into high-efficient cloth-bag dust precipitator;
Step 4: the flue gas after desulfurization and dedusting enters low temperature SCR denitration reactor, and flue gas is in low temperature SCR denitration reactor Interior removing nitrogen oxides, using ammonium hydroxide as reducing agent, ammonium hydroxide is SCR denitration with hot fume heating evaporation in evaporation mixer Ammonia, ammonia subsequently enters flue and flue gas is sufficiently mixed uniformly, then when by SCR reactor, passes through the work of low temperature catalyst With denitration reaction occurs, neat stress is obtained after denitration reaction and is discharged into atmosphere by air-introduced machine and chimney.
Preferably, in the step 3, desulfurization absorbent slurries are Ca (OH)2Slurries or Na2CO3Solution, spray drying process For sulfur removal technology using lime or sodium carbonate as desulfurization absorbent, lime or sodium carbonate add that calcium hydroxide cream is made in water or sodium carbonate is molten Liquid, calcium hydroxide cream or sodium carbonate liquor are by pumping the atomising device squeezed into absorption tower.
Preferably, in the step 3, after semi-dry desulphurization tower, sulfur dioxide concentration≤20mg/ in coke oven flue gas Nm3, flue-gas temperature is less than 230 DEG C.
Preferably, in the step 3, after high-efficient cloth-bag dust precipitator 14, dust concentration≤10mg/Nm3, flue gas temperature ≤ 220 DEG C of degree.
Preferably, in the step 4, for semi-dry desulphurization outlet temperature less than 230 DEG C, low-temperature denitration belongs to low-temperature denitration, Its temperature is 160-230 DEG C, and ammonium sulfate fusing point is 230-280 DEG C, and ammonium sulfate is avoided to adhere to catalyst surface, causes catalyst Failure.
Preferably, in the step 4, denitrification reducing agent is ammonium hydroxide, and ammonium hydroxide squeezes into ammonia water evaporator mixer by aqua ammonia pump It is interior, enter SCR reactor through flue, under the action of low temperature catalyst, NO is reduced into N2And H2O。
The beneficial effects of the present invention are: (1) device of the present invention, realizes the temperature range pair at 160-230 DEG C Coke oven flue gas low-temperature denitration;Investment cost is low, operating cost is low, and desulfurization product has temperature market channel, smoke emissioning pollution object Concentration enjoys national sewerage preferential policy, has significant Social benefit and economic benefit significant well below national standard; Application field is wide: can use the low-temperature denitrations, desulfurization and dedusting field such as coke oven, waste incinerator, Industrial Stoves;
(2) process of the present invention, desulfurization, dedusting and denitration efficiency are high;Using rotating spraying semi-dry desulphurization Technology, non-wastewater discharge, desulfurization slag have stable market channel, thoroughly solve environmental issue;It is much high to discharge flue-gas temperature In flue gas dew point temperature, discharge is without white haze trailing phenomenon, gypsum that the escaping of ammonia existing for the no ammonia process of desulfurization and calcium method desulfurization generate The problems such as rain;Before denitration using semi-dry desulphurization+dedusting thoroughly solve sulfur dioxide in flue gas, in flue gas tar to catalyst Activity influence improves the service life of low temperature catalyst.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
In figure: 1, coke oven;2, flue;3, semi-dry desulphurization tower;4, rotary atomizer;5, absorbent powder cabin;6, spiral meter Measure scale;7, technique water tank;8, technique water pump;9, pulping tank;10, slurry can;11, slurry feeding pump;12, tower bottom unloading valve;13, Drag conveyor;14, bag filter;15, SCR reactor;16, ammonia water tank;17, aqua ammonia pump;18, ammonium hydroxide evaporation mixer; 19, low temperature catalyst;20, air-introduced machine;21, chimney;22, screw conveyor;23, bucket elevator;24, Hui Ku;25, ash is unloaded Valve.
Specific embodiment
In order to which the object of the invention, technical solution is more clearly understood, below with reference to embodiment, the present invention is made further It is described in detail.
Embodiment 1:
As shown in Figure 1, coke oven flue gas semi-dry desulphurization of the present invention, dedusting and low-temperature denitration device, the device packet It includes: coke oven 1, flue 2, semi-dry desulphurization tower 3, rotary atomizer 4, absorbent powder cabin 5, spiral metering scale 6, technique water tank 7, work Skill water pump 8, pulping tank 9, slurry can 10, slurry feeding pump 11, tower bottom unloading valve 12, drag conveyor 13, bag filter 14, SCR reactor 15, ammonia water tank 16, aqua ammonia pump 17, ammonium hydroxide evaporation mixer 18, low temperature catalyst 19, air-introduced machine 20, chimney 21, Screw conveyor 22, bucket elevator 23, grey library 24, unloading valve 25.
In above-mentioned apparatus, coke oven 6, semi-dry desulphurization tower 3, bag filter 14, SCR reactor 15, air-introduced machine 20 and cigarette Chimney is sequentially connected by flue.Rotary atomizer 4 is installed on 3 top of semi-dry desulphurization tower, pacifies at 3 the taper bucket of semi-dry desulphurization tower Equipped with tower bottom unloading valve 12,14 bottom of bag filter is equipped with screw conveyor 22, is mentioned by drag conveyor 13 and bucket type It rises machine 23 to connect with grey library 24, grey 24 lower part ash bucket of library is provided with unloading valve 25.
In above-mentioned apparatus, absorbent preparation system includes: absorbent powder cabin 5, spiral metering scale 6, technique water tank 7, technique Water pump 8, pulping tank 9, slurry can 10 and slurry feeding pump 11.Rotary atomizer is connect with slurry feeding pump by pipeline, is met Absorbent slurry needed for desulfurizing tower.
In above-mentioned apparatus, ammonia feed system includes: ammonia water tank 16, aqua ammonia pump 17 and ammonium hydroxide evaporation mixer 18, ammonium hydroxide Tank 16 is connect by aqua ammonia pump and ammonium hydroxide evaporation mixer with 15 gas approach of SCR reactor.
In above-mentioned apparatus, low temperature catalyst 19 is made of several catalyst modules, and several catalyst modules pass through steel bracket It is arranged in SCR reactor 15, the flue-gas temperature that this denitrification apparatus can handle nitrogen-containing oxide is 120 DEG C~230 DEG C.Low temperature is urged Agent uses cellular structure.
Device of the present invention realizes the temperature range at 160-230 DEG C to coke oven flue gas low-temperature denitration;Capital cost With low, operating cost is low, desulfurization product has temperature market channel, smoke emissioning pollution object concentration well below national standard, enjoys By national sewerage preferential policy, have significant Social benefit and economic benefit significant;Application field is wide: can use coke oven, rubbish The low-temperature denitrations such as rubbish incinerator, Industrial Stoves, desulfurization and dedusting field;
Embodiment 2:
The process of coke oven flue gas semi-dry desulphurization of the present invention, dedusting and low-temperature denitration device, including it is as follows Step:
Step 1: from 1 tail portion of coke oven come out coke oven flue gas by flue 2 be sent into desulfurizing tower inside, absorbent slurry by Pump squeezes into the rotary atomizer 4 at the top of absorption tower;
Step 2: in absorption tower, the absorbent and flue gas for being atomized into fine drop are mixed, in flue gas SO2Chemical reaction occurs and generates sulfate, the SO in flue gas2It is removed, at the same time, the moisture that absorbent is brought into is steamed rapidly It sends out and dries, flue-gas temperature decreases;
Step 3: desulfurization reaction product and a small amount of unemployed desulfurization absorbent a part go out from desulfurizing tower bottom cone Mouth discharge, a part are taken absorption tower out of with flue gas in the form of dry particulate matter, are collected down into high-efficient cloth-bag dust precipitator 14 Come;
Step 4: the flue gas after desulfurization and dedusting enters low temperature SCR denitration reactor, and flue gas is in low temperature SCR denitration reactor Interior removing nitrogen oxides, using ammonium hydroxide as reducing agent, ammonium hydroxide is SCR denitration with hot fume heating evaporation in evaporation mixer Ammonia, ammonia subsequently enters flue 2 and flue gas is sufficiently mixed uniformly, then when by SCR reactor 15, passes through low temperature catalyst 19 Effect denitration reaction occurs, after denitration reaction neat stress is discharged into atmosphere by air-introduced machine 20 and chimney 21.
In the step 3, desulfurization absorbent slurries are CaOH2Slurries or Na2CO3Solution, spray drying process sulfur removal technology Add water that calcium hydroxide cream or sodium carbonate liquor, calcium hydroxide is made using lime or sodium carbonate as desulfurization absorbent, lime or sodium carbonate Cream or sodium carbonate liquor are by pumping the atomising device squeezed into absorption tower.
In the step 3, after semi-dry desulphurization tower 3, sulfur dioxide concentration≤20mg/Nm in coke oven flue gas3, cigarette Temperature degree is less than 230 DEG C.
In the step 3, after high-efficient cloth-bag dust precipitator 14, dust concentration≤10mg/Nm3, flue-gas temperature≤220 ℃。
In the step 4, for semi-dry desulphurization outlet temperature less than 230 DEG C, low-temperature denitration belongs to low-temperature denitration, temperature It is 160-230 DEG C, ammonium sulfate fusing point is 230-280 DEG C, and ammonium sulfate is avoided to adhere to catalyst surface, causes catalyst failure.
In the step 4, denitrification reducing agent is ammonium hydroxide, and ammonium hydroxide is squeezed into ammonia water evaporator mixer by aqua ammonia pump 17, warp Flue 2 enters SCR reactor 15, and under the action of low temperature catalyst 19, NO is reduced into N2And H2O。
Process of the present invention, desulfurization, dedusting and denitration efficiency are high;Using rotating spraying semi-dry desulphurization skill Art, non-wastewater discharge, desulfurization slag have stable market channel, thoroughly solve environmental issue;Discharge flue-gas temperature is significantly larger than Flue gas dew point temperature, discharge is without white haze trailing phenomenon, gypsum rain that the escaping of ammonia existing for the no ammonia process of desulfurization and calcium method desulfurization generate The problems such as;Thoroughly solve using semi-dry desulphurization+dedusting that sulfur dioxide in flue gas, tar is living to catalyst in flue gas before denitration Property influence, improve the service life of low temperature catalyst 19.
Embodiment 3:
Assuming that having 5.5 meters of coke ovens, flue gas flow 120000Nm3/ h discharge, flue-gas temperature can reach 270 DEG C, cigarette Sulfur dioxide concentration 200mg/Nm in gas3, nitrous oxides concentration 800mg/Nm3, dust concentration 40mg/Nm3, moisture content 15%.It is de- Sulfur absorbing agent is calcium hydroxide, and denitrification reducing agent is 25% ammonium hydroxide.
As shown in Figure 1,270 DEG C of the flue gas come out from coke oven 1 enters semi-dry desulphurization tower 3 by flue 2, it is stored in suction The lime received in agent powder cabin 5 is sent into pulping tank 9 through spiral metering scale 6, and the process water in technique water tank 7 is sent by technique water pump 8 Enter pulping tank 9, calcium hydroxide cream is made, calcium hydroxide milk flow enters slurry can 10, and calcium hydroxide cream, which is squeezed into be located at by slurry feeding pump 11, to be inhaled Receive the rotary atomizer 4 in tower.In absorption tower, the absorbent and flue gas for being atomized into fine drop are mixed, with flue gas In SO2Chemical reaction occurs and generates CaSO3, SO in flue gas2It is removed.Waste residue a part after completing desulphurization reaction is with dry State form is exported from the cone tower bottom unloading valve 12 of semi-dry desulphurization tower 3 and is discharged, a part of desulfurization reaction product and unutilized Absorbent take desulfurizing tower out of with flue gas in the form of dry particulate matter, be captured down into bag filter 14, by cloth The screw conveyor 22 of 14 bottom of bag dust collector is discharged, and is sent into grey library 24 by drag conveyor 13 and bucket elevator 23, ash Unloading valve 25 is set at bottom storehouse portion cone bucket.After the absorbent of hygrometric state sprays into absorption tower, in one side absorbent and flue gas Sulfur dioxide chemically reacts;Another aspect flue gas transfers heat to absorbent again and is allowed to continuous drying, at the same time cigarette Temperature degree decreases.After semi-dry desulphurization tower 3, sulfur dioxide concentration≤20mg/Nm in coke oven flue gas3, flue-gas temperature Less than 230 DEG C.After high-efficient cloth-bag dust precipitator 14, dust concentration≤10mg/Nm3, flue-gas temperature≤220 DEG C.Through cloth bag The filtered flue gas of deduster 14 enters SCR reactor 15, built-in cellular formula in SCR reactor 15 through ammonium hydroxide evaporation mixer 18 Low temperature catalyst 19.Ammonium hydroxide is sent into ammonium hydroxide by aqua ammonia pump 17 and evaporates blender 18 by ammonia water tank 16, and ammonium hydroxide is mixed in ammonium hydroxide evaporation Ammonia is generated in clutch 18, and is sent into reactor in 15 gas approach of SCR reactor, in the effect of low temperature catalyst 19 Under, nitrogen oxides has catalytic reduction reaction with ammonia gas and is removed, and purified flue gas is after air-introduced machine 20 through chimney 21 Discharge.Since flue-gas temperature is up to 220 DEG C, so ammonium hydroxide evaporation is not required to separately set heating device, and since flue gas passes through semidry method The filtering of desulfurizing tower 3 and bag filter 14, flue gas cleannes are very high, not will cause catalyst abrasion, blocking and poisoning.Institute With the present embodiment also not set steam soot-blower.
The present embodiment exiting flue gas discharges sulfur dioxide concentration≤20mg/Nm3;Dust concentration≤10mg/Nm3;NOxConcentration ≤100mg/Nm3;Well below special emission limit in " coking chemistry emission of industrial pollutants standard " (GB16171-2012) Regulation, " 6 atmosphere pollution of table especially discharges limit in " coking chemistry emission of industrial pollutants standard " (GB16171-2012) Regulation in value ": SO2Concentration of emission≤30mg/Nm3, NOxConcentration of emission≤150mg/Nm3, granular material discharged concentration≤15mg/ Nm3
The present invention can be widely used in flue gas and need purification device occasion, be particularly suitable for coke oven, waste incinerator, industry The low-temperature denitrations such as kiln, desulfurization and dedusting field.
The foregoing is merely presently preferred embodiments of the present invention and oneself, not with the present invention for limitation, it is all in essence of the invention Made impartial modifications, equivalent substitutions and improvements etc., should be included in patent covering scope of the invention within mind and principle.

Claims (10)

1. a kind of coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device, which is characterized in that including by flue (2) according to Secondary connected coke oven (1), semi-dry desulphurization tower (3), bag filter (14), SCR reactor (15), air-introduced machine (20) and chimney (21), rotary atomizer (4) is installed at the top of semi-dry desulphurization tower (3), is equipped with tower bottom at semi-dry desulphurization tower (3) the taper bucket Unloading valve (12), bag filter (14) bottom are equipped with screw conveyor (22), are mentioned by drag conveyor (13) and bucket type It rises machine (23) to connect with grey library (24), grey library (24) lower part ash bucket is provided with unloading valve (25);It further include absorbent preparation system With ammonia feed system, absorbent preparation system includes the absorbent powder cabin (5) being sequentially connected, spiral metering scale (6), process water Case (7), technique water pump (8), pulping tank (9), slurry can (10) and slurry feeding pump (11), rotary atomizer (4) and slurries are defeated Pump (11) is sent to connect by pipeline;Ammonia feed system includes ammonia water tank (16), aqua ammonia pump (17) and ammonium hydroxide evaporation mixer (18), ammonia water tank (16) connects by aqua ammonia pump (17) and ammonium hydroxide evaporation mixer (18) and SCR reactor (15) gas approach (2) It connects.
2. coke oven flue gas semi-dry desulphurization according to claim 1, dedusting and low-temperature denitration device, which is characterized in that SCR Low temperature catalyst (19) built in reactor (15), low temperature catalyst (19) is made of several catalyst modules, if dry catalyst mould Block is arranged in SCR reactor (15) by steel bracket.
3. coke oven flue gas semi-dry desulphurization according to claim 2, dedusting and low-temperature denitration device, which is characterized in that institute Low temperature catalyst (19) are stated using cellular structure.
4. coke oven flue gas semi-dry desulphurization according to claim 3, dedusting and low-temperature denitration device, which is characterized in that institute The flue-gas temperature for stating low temperature catalyst (19) processing nitrogen-containing oxide is 120 DEG C~230 DEG C.
5. the work of a kind of coke oven flue gas semi-dry desulphurization according to any one of claims 1 to 4, dedusting and low-temperature denitration device Process, which comprises the steps of:
Step 1: from coke oven (1) tail portion come out coke oven flue gas by flue (2) be sent into desulfurizing tower inside, absorbent slurry by Pump squeezes into the rotary atomizer (4) at the top of absorption tower;
Step 2: in absorption tower, the absorbent and flue gas for being atomized into fine drop are mixed, with the SO in flue gas2Occur Chemical reaction generates sulfate, the SO in flue gas2It is removed, at the same time, the moisture that absorbent is brought into is evaporated rapidly and does Dry, flue-gas temperature decreases;
Step 3: desulfurization reaction product and a small amount of unemployed desulfurization absorbent a part are exported from desulfurizing tower bottom cone and are arranged Out, a part takes absorption tower out of with flue gas in the form of dry particulate matter, is collected into high-efficient cloth-bag dust precipitator (14);
Step 4: the flue gas after desulfurization and dedusting enters low temperature SCR denitration reactor, and flue gas takes off in low temperature SCR denitration reactor Denitrification, for SCR denitration using ammonium hydroxide as reducing agent, ammonium hydroxide is ammonia with hot fume heating evaporation in evaporation mixer Gas, ammonia subsequently enters flue (2) and flue gas is sufficiently mixed uniformly, then when by SCR reactor (15), passes through low temperature catalyst (19) denitration reaction occurs for effect, obtains neat stress after denitration reaction and is discharged into atmosphere by air-introduced machine (20) and chimney (21).
6. the process of coke oven flue gas semi-dry desulphurization according to claim 5, dedusting and low-temperature denitration device, special Sign is, in the step 3, desulfurization absorbent slurries are Ca (OH)2Slurries or Na2CO3Solution, spray drying process sulfur removal technology Add water that calcium hydroxide cream or sodium carbonate liquor, calcium hydroxide is made using lime or sodium carbonate as desulfurization absorbent, lime or sodium carbonate Cream or sodium carbonate liquor are by pumping the atomising device squeezed into absorption tower.
7. the process of coke oven flue gas semi-dry desulphurization according to claim 6, dedusting and low-temperature denitration device, special Sign is, in the step 3, after semi-dry desulphurization tower (3), and sulfur dioxide concentration≤20mg/Nm in coke oven flue gas3, cigarette Temperature degree is less than 230 DEG C.
8. the process of coke oven flue gas semi-dry desulphurization according to claim 6 or 7, dedusting and low-temperature denitration device, It is characterized in that, in the step 3, after high-efficient cloth-bag dust precipitator (14), dust concentration≤10mg/Nm3, flue-gas temperature ≤220℃。
9. the process of coke oven flue gas semi-dry desulphurization according to claim 5, dedusting and low-temperature denitration device, special Sign is, in the step 4, for semi-dry desulphurization outlet temperature less than 230 DEG C, low-temperature denitration belongs to low-temperature denitration, and temperature is 160-230 DEG C, ammonium sulfate fusing point is 230-280 DEG C, and ammonium sulfate is avoided to adhere to catalyst surface, causes catalyst failure.
10. the process of coke oven flue gas semi-dry desulphurization according to claim 9, dedusting and low-temperature denitration device, It is characterized in that, in the step 4, denitrification reducing agent is ammonium hydroxide, and ammonium hydroxide squeezes into ammonia water evaporator mixer by aqua ammonia pump (17) It is interior, enter SCR reactor (15) through flue (2), under the action of low temperature catalyst (19), NO is reduced into N2And H2O。
CN201811401019.1A 2018-11-22 2018-11-22 Coke oven flue gas semi-dry desulphurization, dedusting and low-temperature denitration device and its process Withdrawn CN109331649A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111821856A (en) * 2020-07-29 2020-10-27 湖南萃智环保科技有限公司 Industrial flue gas denitration method
CN112807999A (en) * 2021-01-13 2021-05-18 沈阳铝镁设计研究院有限公司 Low-temperature denitration system of aluminum oxide roasting furnace
CN113332849A (en) * 2021-06-09 2021-09-03 江苏三井环保股份有限公司 Flue gas SDA (serial advanced technology architecture) desulfurization and dust removal method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111821856A (en) * 2020-07-29 2020-10-27 湖南萃智环保科技有限公司 Industrial flue gas denitration method
CN112807999A (en) * 2021-01-13 2021-05-18 沈阳铝镁设计研究院有限公司 Low-temperature denitration system of aluminum oxide roasting furnace
CN113332849A (en) * 2021-06-09 2021-09-03 江苏三井环保股份有限公司 Flue gas SDA (serial advanced technology architecture) desulfurization and dust removal method

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