CN108465371A - One kind being based on minimum discharge fume treatment running gear and processing method - Google Patents

One kind being based on minimum discharge fume treatment running gear and processing method Download PDF

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Publication number
CN108465371A
CN108465371A CN201810527231.6A CN201810527231A CN108465371A CN 108465371 A CN108465371 A CN 108465371A CN 201810527231 A CN201810527231 A CN 201810527231A CN 108465371 A CN108465371 A CN 108465371A
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CN
China
Prior art keywords
flue gas
flue
heat
processing
wet
Prior art date
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Pending
Application number
CN201810527231.6A
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Chinese (zh)
Inventor
吴宁
邵伟涛
罗翠红
刘学迅
贺毅
石峰
徐爱杰
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Guangzhou Ring Design And Research Institute Co Ltd
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Guangzhou Ring Design And Research Institute Co Ltd
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Priority to CN201810527231.6A priority Critical patent/CN108465371A/en
Publication of CN108465371A publication Critical patent/CN108465371A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators 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
    • B01D46/023Pockets filters, i.e. multiple bag filters mounted on a common frame
    • 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
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/80Semi-solid phase processes, i.e. by using slurries
    • 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
    • B01D53/8625Nitrogen oxides
    • 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
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • 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 one kind being based on minimum discharge fume treatment running gear and processing method, suitable for city garbage burning power plant, it discloses using traditional non-selective catalytic reduction denitration technology+semidry method/dry-process deacidification+bag filter and increases the device and processing method of wet method depickling+low-temperature selective catalytic reduction fume treatment, the range of operation of unit load can be not only widened in this way, and can also meet the needs of flue gas minimum discharge.

Description

One kind being based on minimum discharge fume treatment running gear and processing method
Technical field
The present invention relates to the fume treatment fields of garbage incinerating power plant, in particular for the minimum discharge of flue gas.
Background technology
Minimizing, recycling, innoxious may be implemented using the method for burning disposal in rubbish, but in Refuse Incineration Process It will produce the pernicious gases such as HCL, SO2, NOx.Burning power plant would generally use non-selective catalytic reduction denitration technology+ " semidry method/dry-process deacidification+bag filter " handles flue gas, but NOx emission can be caused exceeded when unit is in heavy-duty service, At this time in order to meet the requirement of flue gas qualified discharge, it has to reduce unit load, influence economic benefit.Simultaneously using non-selection Property catalytic-reduction denitrified technology needs ammonia is sprayed in stove, excessive ammonia can cause the escaping of ammonia, and react generation with the SO3 in flue gas NH4HSO4 blocks bag filter, reduces the removal efficiency to dust.In addition to this, semidry method/dry-process deacidification technique is by flue gas Temperature is affected, and deacidification efficiency is low compared to wet method depickling, cannot be guaranteed that flue gas is up to standard when load is higher.
Invention content
The object of the present invention is to provide based on minimum discharge fume treatment running gear and method, it is in bag filter Wet method depickling+low-temperature selective catalytic reduction denitration is added below, makes to run under unit high load capacity, improves generated energy, Er Qieke To meet the requirement of flue gas minimum discharge.
The technology of the present invention solution is in incinerator, non-selective catalytic reduction denitration, half-dried reaction tower, bag-type dust Device, bag filter outlet, feature are that flue gas enters flue gas-flue gas heat-exchange unit one by bag filter outlet, enter back into wet method The wet scrubber tower of depickling processing, after the wet scrubber tower, into the packing channel in flue gas-flue gas heat-exchange unit two after it is straight It taps into and chimney is introduced by air-introduced machine into the flue in steam-flue gas heat-exchange unit, then chosen property catalytic reduction reactor, from selection Property catalytic reduction reactor flue in synchronized splitter part of smoke through heat dilution wind turbine, after electric heater, evaporated into ammonium hydroxide Mixing module after carrying out heating dilution to ammonium hydroxide, sprays into " ∩ types " flue, in scr reactor by ammonia-spraying grid The interior NOx with flue gas reacts, then is sent to smokestack by air-introduced machine and be discharged into air.
It is non-selection that the minimum discharge flue gas processing method of the present invention is that flue gas that incinerator goes out conventionally first carries out Property catalytic-reduction denitrified processing, pass through half-reaction tower and carry out semidry method depickling processing, after bag filter is handled, in flue gas Still contain exceeded flue gas content NOx, SOx, feature of the present invention is to increase wet method depickling+low temperature on conventional process flow tail portion Selective catalytic reduction flue gas treatment process.Flue gas enters one lower layer part of flue gas-flue gas heat-exchange unit from bag filter outlet, so Tower is washed by wet type and carries out wet method depickling processing, further the sour gas of 90% or more removal, the cigarette of wet scrubber tower outlet About 60~70 DEG C of temperature degree, then passes through the high temperature cigarette of one upper layer part of flue gas-flue gas heat-exchange unit and wet scrubber tower entrance again After gas heat exchange, so that flue-gas temperature is increased to about 125 DEG C, then pass through flue gas-flue gas heat-exchange unit two and selective catalytic reduction again The high-temperature flue gas of reactor outlet exchanges heat, and flue gas is made further to be promoted, by the flue gas after flue gas-flue gas heat-exchange unit two again by Steam-flue gas heat-exchange unit further heats up, and flue gas is entered scr reactor, chosen property to 170 DEG C After catalytic reduction reactor, flue gas divides primary and secondary two tunnels, and main flue gas road sprays into chimney through air-introduced machine, and secondary gas flue is through heat dilution wind Machine carries out heating dilution after electric heater into ammonium hydroxide evaporator mixing module to ammonium hydroxide, when to be mixed into design dense for ammonium hydroxide evaporation When spending, then flue is sprayed by ammonia-spraying grid and is sufficiently mixed with flue gas, flue gas enters scr reactor inlet temperature Promotion, other than carrying out steam-flue gas heat-exchange unit, some come from selective catalysis reduction reactor outlet high temperature Flue gas improves utilization rate of waste heat.Under the catalytic action of low-temperature selective catalytic reduction reactor, it can be gone through decomposing NOx Except 90% or more NOx, flue gas reaches minimum discharge standard.
For the cleaning solution that the wet method depickling of the above present invention uses for NaOH, the primary product NaCl of generation is dissolved in water, avoids The by-product gypsum generated using limewash depickling, causes line clogging, meanwhile, scr reactor 10 is arranged in Behind deacidification system, dust content in flue gas, SO2 and other harmful substances are considerably less at this time, non-to the denitration efficiency of catalyst Chang Youli.
When the semidry method or wet method unit ad hoc inspection and repair of the present invention, arbitrary a set of unit can be used and adjust operating parameter to cigarette Gas carries out efficient depickling, ensures that flue gas emission is up to standard, in addition to this, is optimized and revised by what is utilized to two-stage unit, Neng Goushi Meet the purpose of flue gas qualified discharge under present optimum economic benefit.
The present invention can be subtracted by optimizing non-selective catalytic reduction and the selective catalytic reduction combined denitration method of operation The dosage of small ammonia prevents the escaping of ammonia and the generation of NH4HSO4, avoids strong cohesive property of the cloth bag due to NH4HSO4, results in blockage.
Using non-selective catalytic reduction denitration technology+semidry method/dry-process deacidification+bag filter+wet method depickling+low Temperature selective catalytic reducing smoke treatment technology increases wet method depickling+cryogenic selective catalysis also in original technological process Former denitration process technique can not only widen the range of operation of unit load, and can also meet flue gas minimum discharge in this way Demand.
Compared with prior art, the present invention has the following advantages:
(1) requirement that disclosure satisfy that unit heavy-duty service flue gas qualified discharge, improves economic benefit.
(2) when joint is using low-temperature selective catalytic reduction denitration, it is avoided that being sprayed at non-selective catalytic reduction denitration Enter excessive ammonia, cause the escaping of ammonia, ammonium hydrogen sulfate is caused to block the generation of cloth bag phenomenon.
(3) semidry method/dry-process deacidification is 85% to the removal efficiency of SO2, and wet method depickling reaches the removal efficiency of SO2 To 95%, sour gas can further be removed, meet the requirement of minimum discharge.
(4) flue gas-flue gas heat-exchange unit is installed, the heat of tail portion high-temperature flue gas is made full use of to heat low-temperature flue gas, reduces The input of external heat source.
Description of the drawings
Fig. 1 is traditional type flue gas treating process flow diagram;
Fig. 2 is flue gas treating process flow diagram of the present invention.
Specific implementation mode
Implementation steps are as follows:
(1) the flue gas treating process flow before Fig. 1 is transformation.The technological process includes:Incinerator 13 non-selective is urged Change reduction denitration 14, half-dried reaction tower 15, bag filter 16, bag filter outlet 1, chimney.Rubbish is in incinerator 13 It burns the flue gas generated and first passes around the progress denitration process of non-selective catalytic reduction device 14, next passes through half-dried reaction tower 15 carry out semidry method depickling processing, then flow through 16 dedusting of bag filter, are finally discharged into air by chimney.This fume treatment Technique is in unit heavy-duty service, it is difficult to meet the requirement of minimum discharge.
(2) Fig. 2 is flue gas treating process of the present invention, and technological process is to be added to wet method on the basis of original technique to take off Acid and low-temperature selective catalytic reduction denitration treatment technology.The technique includes:Flue gas enters flue gas-cigarette by bag filter outlet 1 Gas heat exchanger 1, the wet scrubber tower 3 for reentering wet method depickling processing change after the wet scrubber tower 3 into flue gas-flue gas Flue in straight steam-flue gas heat-exchange unit 8 after packing channel in hot device 27, then chosen property catalytic reduction reactor 10 Chimney is introduced by air-introduced machine 11, synchronized splitter part of smoke is through heat dilution wind from scr reactor flue 10 Machine 4 after electric heater 5, evaporates mixing module 6 into ammonium hydroxide, after carrying out heating dilution to ammonium hydroxide, is sprayed by ammonia-spraying grid 9 " ∩ types " flue is reacted with the NOx in flue gas in the scr reactor 10, then by air-introduced machine 11 send to Smokestack 12 is discharged into air.
(3) minimum discharge flue gas processing method of the present invention is that flue gas enters wet scrubber tower 3 from bag filter outlet 1 Depickling processing is carried out, treated, and flue gas flows through one upper layer part 2 of flue gas-flue gas heat-exchange unit, and flue gas-flue gas heat-exchange unit 27 steams Vapour-flue gas heat-exchange unit 8 carries out flue gas, and after reaching assigned temperature, denitration is carried out into scr reactor 10 Processing, treated, and clean flue gas is discharged into air through air-introduced machine by chimney.
(4) flue gas can remove 80% or more sour gas after semidry method depickling processing, using the wet of back segment Formula scrubbing tower 3 carries out wet method depickling processing, and can further remove 90% or more sour gas so that flue gas meets ultralow row The requirement put.
(5) flue-gas temperature that wet scrubber tower 3 exports is about 60~70 DEG C, passes through one upper layer of flue gas-flue gas heat-exchange unit Portion 2 makes flue-gas temperature be increased to about 125 DEG C, then passes through cigarette again with after the high-temperature flue gas heat exchange of 3 entrance of wet scrubber tower The high-temperature flue gas that gas-flue gas heat-exchange unit 27 is exported with scr reactor 10 exchanges heat, and keeps smoke temperature further It is promoted.
(6) flue gas after the heat absorption of flue gas-flue gas heat-exchange unit 27, then further heated up and (adopted by steam-flue gas heat-exchange unit 8 Heated with 4.0 megapascal superheated steams), by flue gas to 170 DEG C of entrance scr reactors 10.
(7) part of smoke is extracted out from 10 flue of scr reactor through heat dilution wind turbine 4, electric heater After 5, heating dilution is carried out to ammonium hydroxide into ammonium hydroxide evaporation mixing module 6, when ammonium hydroxide evaporation is mixed into design concentration, then by spraying Ammonia grid 9 sprays into flue, is sufficiently mixed with flue gas, under the catalytic action of low-temperature selective catalytic reduction reactor 10, decomposes NOx。
(8) NOx in flue gas is after early period non-selective catalytic reduction denitration process in incinerator, 60% or so in flue gas NOx can effectively remove, after the chosen property catalytic reduction reactor of remaining NOx 10, and can further remove 90% or more NOx can make the NOx in flue gas meet the requirement of minimum discharge using combined purifying denitrating flue gas treatment process.
(9) promotion of 10 entrance flue gas temperature of scr reactor, in addition to coming from steam-flue gas heat-exchange unit Outside 8, some comes from the high-temperature flue gas of the outlet of scr reactor 10, substantially increases in this way more than flue gas The efficiency of heat utilization improves the economy of power plant.
(10) for the cleaning solution that the depickling of this technique wet method uses for NaOH, the primary product NaCl of generation is dissolved in water, avoids adopting The by-product gypsum generated with limewash depickling, causes line clogging.Meanwhile scr reactor 10 be arranged in it is de- Behind acid system, dust content in flue gas, SO2 and other harmful substances are considerably less at this time, very to the denitration efficiency of catalyst Favorably.
(11) semidry method or when wet method unit ad hoc inspection and repair, can be used arbitrary a set of unit adjustment operating parameter to flue gas into The efficient depickling of row ensures that flue gas emission is up to standard.In addition to this, it is optimized and revised, can be realized by what is utilized to two-stage unit Meet the purpose of flue gas qualified discharge under optimum economic benefit.
(12) by optimizing non-selective catalytic reduction and the selective catalytic reduction combined denitration method of operation, can reduce The dosage of ammonia prevents the escaping of ammonia and the generation of NH4HSO4, avoids strong cohesive property of the cloth bag due to NH4HSO4, results in blockage.

Claims (5)

1. one kind being based on minimum discharge fume treatment running gear, including incinerator, non-selective catalytic reduction denitration is half-dried anti- Tower, bag filter, bag filter outlet, chimney are answered, it is characterized in that flue gas enters flue gas-flue gas by bag filter outlet Heat exchanger one enters back into the wet scrubber tower of wet method depickling processing, after the wet scrubber tower, into flue gas-flue gas heat exchange Be directly entered after packing channel in device two flue in steam-flue gas heat-exchange unit, then chosen property catalytic reduction reactor by Air-introduced machine introduces chimney, and synchronized splitter part of smoke is through heat dilution wind turbine, electricity from scr reactor flue After heater, mixing module is evaporated into ammonium hydroxide, after carrying out heating dilution to ammonium hydroxide, " ∩ types " flue is sprayed by ammonia-spraying grid, It reacts with the NOx in flue gas in scr reactor, then is sent to smokestack by air-introduced machine and be discharged into air.
2. one kind is based on minimum discharge flue gas processing method, including the flue gas that goes out of incinerator conventionally first carry out it is non-selection Property catalytic-reduction denitrified processing, pass through half-reaction tower and carry out semidry method depickling processing, after bag filter is handled, in flue gas Still contain exceeded flue gas content NOx, SOx, the present invention it is characterized in that, increase wet method depickling+low on conventional process flow tail portion Temperature selective catalytic reducing smoke treatment process, flue gas enter one lower layer part of flue gas-flue gas heat-exchange unit from bag filter outlet, Then wet method depickling processing is carried out through wet scrubber tower, further the sour gas of 90% or more removal, wet scrubber tower outlet About 60~70 DEG C of flue-gas temperature, then pass through the height of flue gas-flue gas heat-exchange unit one upper layer part and wet scrubber tower entrance again After warm flue gas heat exchange, so that flue-gas temperature is increased to about 125 DEG C, then pass through flue gas-flue gas heat-exchange unit two and selective catalysis again The high-temperature flue gas of reduction reactor outlet exchanges heat, and so that flue gas is further promoted, by the flue gas after flue gas-flue gas heat-exchange unit two It is further heated up again by steam-flue gas heat-exchange unit, flue gas is entered into scr reactor to 170 DEG C, through choosing After selecting property catalytic reduction reactor, flue gas divides primary and secondary two tunnels, and main flue gas road sprays into chimney through air-introduced machine, and secondary gas flue is dilute through heat It releases wind turbine, heating dilution is carried out to ammonium hydroxide into ammonium hydroxide evaporator mixing module after electric heater, set when ammonium hydroxide evaporation is mixed into When counting concentration, then flue is sprayed by ammonia-spraying grid and is sufficiently mixed with flue gas, flue gas enters scr reactor entrance The promotion of temperature, other than carrying out steam-flue gas heat-exchange unit, some comes from the outlet of selective catalysis reduction reactor High-temperature flue gas improves utilization rate of waste heat.Under the catalytic action of low-temperature selective catalytic reduction reactor, through decomposing NOx 90% or more NOx can be removed, flue gas reaches minimum discharge standard.
3. according to claim 2 processing method, it is characterized in that:The cleaning solution that wet method depickling uses is NaOH, the main production of generation Object NaCl is dissolved in water, avoids the by-product gypsum generated using limewash depickling, causes line clogging, meanwhile, selective catalysis Reduction reactor 10 is arranged in behind deacidification system, and dust content in flue gas, SO2 and other harmful substances are considerably less at this time, right The denitration efficiency of catalyst is highly beneficial.
4. according to claim 2 processing method, it is characterized in that:When the semidry method or wet method unit ad hoc inspection and repair of the present invention, it can adopt Efficient depickling is carried out to flue gas with arbitrary a set of unit adjustment operating parameter, ensures that flue gas emission is up to standard, in addition to this, by right What two-stage unit utilized optimizes and revises, and can realize the purpose for meeting flue gas qualified discharge under optimum economic benefit.
5. according to claim 2 processing method, it is characterized in that:The present invention is urged by optimizing non-selective catalytic reduction and selectivity Change reduction the combined denitration method of operation, the dosage of ammonia can be reduced, prevent the escaping of ammonia and the generation of NH4HSO4, avoid cloth bag by In the strong cohesive property of NH4HSO4, result in blockage.
CN201810527231.6A 2018-05-29 2018-05-29 One kind being based on minimum discharge fume treatment running gear and processing method Pending CN108465371A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109092039A (en) * 2018-10-11 2018-12-28 广州环投设计研究院有限公司 A kind of flexible and efficient ultra-clean fume treatment technology
CN109925869A (en) * 2019-04-12 2019-06-25 洁华控股股份有限公司 Flue gas of refuse burning high-efficient purification processing method
CN110433654A (en) * 2019-08-08 2019-11-12 光大环保能源(杭州)有限公司 A kind of smoke gas comprehensive treatment system
CN111346509A (en) * 2020-04-28 2020-06-30 苏州西热节能环保技术有限公司 Diagnosis method for ammonium bisulfate poisoning of SCR denitration catalyst

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109092039A (en) * 2018-10-11 2018-12-28 广州环投设计研究院有限公司 A kind of flexible and efficient ultra-clean fume treatment technology
CN109925869A (en) * 2019-04-12 2019-06-25 洁华控股股份有限公司 Flue gas of refuse burning high-efficient purification processing method
CN110433654A (en) * 2019-08-08 2019-11-12 光大环保能源(杭州)有限公司 A kind of smoke gas comprehensive treatment system
CN111346509A (en) * 2020-04-28 2020-06-30 苏州西热节能环保技术有限公司 Diagnosis method for ammonium bisulfate poisoning of SCR denitration catalyst

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