CN106178877A - A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique - Google Patents

A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique Download PDF

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Publication number
CN106178877A
CN106178877A CN201610782094.1A CN201610782094A CN106178877A CN 106178877 A CN106178877 A CN 106178877A CN 201610782094 A CN201610782094 A CN 201610782094A CN 106178877 A CN106178877 A CN 106178877A
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China
Prior art keywords
flue
coke oven
heat recovery
waste
desulfurization
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CN201610782094.1A
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Chinese (zh)
Inventor
赵昕哲
黄琳
胡光宏
于骁
韩旭
焦玉修
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大连华锐重工集团股份有限公司
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Priority to CN201610782094.1A priority Critical patent/CN106178877A/en
Publication of CN106178877A publication Critical patent/CN106178877A/en

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    • 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
    • B01D53/75Multi-step processes
    • 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
    • B01D46/0019Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/0023Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • 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
    • 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
    • B01D46/24Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411Filter cartridges
    • 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
    • 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
    • B01D53/8628Processes characterised by a specific catalyst
    • 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
    • B01D53/90Injecting reactants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • 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
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/404Alkaline earth metal or magnesium compounds of calcium
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • F27D2017/006Systems for reclaiming waste heat using a boiler
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Abstract

A kind of coke oven flue waste gas purification waste heat recovery apparatus, including the coke oven underground flue being linked in sequence by flue system, denitrification apparatus, desulfurizer, dust arrester, and ash conveying device and coke oven chimney, it is characterized in: between denitrification apparatus with desulfurizer, be connected the retracting device that has surplus heat.A kind of technique using the said equipment to carry out coke oven flue waste gas purification waste heat recovery, it is characterized in that: the flue gas after denitration enters waste-heat recovery device and carries out waste heat recovery, the desulfurizing agent of its atomising device is modulated into desulfurization slurry by calcium hydroxide or ammonia with fresh water (FW).This technical scheme makes the flue gas pollutant content after purifying far below discharging standards.Avoid the impact of alkali metal (K, Na, Ca etc.) ion pair catalyst.Overcome and then need the drawback of afterburning because first desulfurization makes temperature reduce.Simple and compact for structure, take up an area little, install and easy to maintenance, overcome that equipment investment in prior art is big, energy resource consumption is high, desulfuration efficiency is low and causes secondary environmental pollution problem.

Description

A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique
Technical field
The device systems of the present invention and method relate to coke oven energy-conserving and environment-protective field.
Background technology
Processing at the early-stage currently for coke oven flue exhuast gas desulfurization denitration, the process used is substantially all Experimental stage.The technique one used is first desulfurization, then SCR denitration (i.e. dry desulfurization+afterburning+denitration);Another kind is First SCR denitration, then desulfurization (i.e. denitration+wet desulphurization);The third is wet desulphurization denitrating technique (i.e. wet desulphurization+ozone Oxidation wet denitration).
First desulfurization uses dry method, and rear desulfurization uses wet method.Dry method: the desulfurizing agent of use is sodium carbonate or carbonic acid Hydrogen sodium, with SO2Reaction product has a large amount of CO2Produce, not only increase greenhouse gases, be unfavorable for current carbon emission reduction, simultaneously desulfurization Efficiency also can not meet the requirement of discharge.After desulfurization, EGT reduces, and is unsatisfactory for denitration requirement, it is therefore desirable to afterburning, to useless Gas heats up, and adds operating cost.
The wet desulphurization that then desulfurization uses, equipment is complicated, it is big to take up an area, investment is high, energy consumption is big, there is secondary pollution etc. and asks Topic, the heaviest to business burden, it is unfavorable for enterprise development.
The third desulfurization denitration method there is also theoretical research stage at present, and required ozone to prepare energy consumption high.
Prior art one flue gases of cock oven desulphurization denitration combined purifying technique and device (CN201510586987.4) are adopted Be first sodium carbonate semi-dry desulphurization, after take off sulfur, waste gas is improved temperature by afterburning mode, the temperature meeting denitration will Ask, carry out SCR denitration.This technology also exists the waste energy, increases greenhouse gases CO2Discharge, alkali metal that desulfurization is brought into (K, Na, Ca etc.) ion, easily make catalyst poisoning, lose catalytic action.
Summary of the invention
In order to overcome the defect of prior art, it is possible to effectively remove the SO in flue gases of cock oven2、NOxDevice, the most also may be used Reclaiming the part of waste heat in waste gas, the present invention proposes techniques below scheme: a kind of coke oven flue waste gas purification waste heat recovery apparatus, Including the coke oven underground flue being linked in sequence by flue system, denitrification apparatus, desulfurizer, dust arrester, it is additionally provided with defeated ash dress Put and coke oven chimney, it is characterised in that: between denitrification apparatus with desulfurizer, it is connected the retracting device that has surplus heat.Denitrification apparatus sets Having denitration reaction tower, in this denitration reaction tower, smoke inlet side is provided with pre-dedusting device.In denitration reaction tower, top is respectively equipped with Ammonia-gas spraying device and static mixer, and in denitration reaction tower, exhanst gas outlet side is provided with low temperature catalyst room.One end of ammonia steaming device It is connected with dilution air, denitrification reducing agent storage tank respectively, and the other end is connected with ammonia-gas spraying device.The one of the housing of pre-dedusting device Side is provided with entrance, is additionally provided with upper spacer and lower clapboard in housing, and equipped with filtering material between upper spacer and lower clapboard, pre-dedusting fills The lower end put is provided with ash discharging hole.Low temperature catalyst is indoor equipped with the low temperature catalyst using temperature range to be 180~450 DEG C.Remaining Heat reclamation device includes that waste-heat recovery device includes Heat Room and drum placed on it.
Desulfurizer includes that top is provided with atomising device and bottom is provided with the desulfurization reaction tower of disintegrating machine and unloading valve.Desulfurization Agent preparation and feedway top through pipeline be connected with desulfurizing agent case and technique water tank respectively and bottom by pipeline and atomization dress The top put connects.
A kind of equipment used described in claim 1 carries out the technique of coke oven flue waste gas purification waste heat recovery,
The flue gas extracted out from coke oven underground flue is entered denitrification apparatus through flue system, takes off in denitrification apparatus Nitre, it is characterised in that: the flue gas after denitration is discharged at denitration reaction tower bottom, enters back into waste-heat recovery device and carries out waste heat and return Receive.After recovery, flue-gas temperature is down to less than 160 DEG C, enters desulfurization reaction tower along flue and is prepared by desulfurizing agent and feedway confession Entering atomising device desulfurization slurry to mix, the sulfur in abjection flue gas, the desulfurizing agent sending into atomising device is by desulfurizing agent case Desulfurizing agent calcium hydroxide Ca (OH)2Being modulated into desulfurization slurry with the fresh water (FW) being placed in technique water tank, its concentration range is 10%~20%.Also the desulfurizing agent ammonia NH can being placed in desulfurizing agent case 183.H2O adjusts with the fresh water (FW) being placed in technique water tank The concentration range making desulfurization slurry is 10%~20%.In these cases, the concentration optimum being modulated into desulfurization slurry is 15%.Subsequently into dust arrester dedusting, the flue gas after purification, by the regulating fan in flue system, sends coke oven underground cigarette back to Road, through coke oven smoke stack emission.
The present invention uses the technical scheme of desulphurization denitration recovery waste heat simultaneously, uses with low temperature sulfur-tolerant type catalyst and hydrogen-oxygen Change calcium (Ca (OH)2) or ammonia (NH3.H2O) semi-dry desulfurizing process so that the flue gas pollutant content after purification is far below state Family's discharge standard.Which overcome deficiency of the prior art, one, avoid the shadow of alkali metal (K, Na, Ca etc.) ion pair catalyst Ring, because they easily make catalyst poisoning, lose catalytic action;Two, overcome because first desulfurization makes temperature reduction then need to mend Combustion meets the drawback of denitration.Using semi-dry desulphurization to add sulfur-tolerant type low temperature catalyst, denitration efficiency is high;Simple and compact for structure, account for Ground area is little, install and safeguard all very convenient, thus equipment investment in the presence of solving current techniques is big, equipment is complicated, Energy resource consumption is big, desulfuration efficiency is the highest and causes the problems such as secondary environmental pollution.
Accompanying drawing explanation
Fig. 1 is coke oven flue exhuast gas desulfurization denitration waste heat recovery apparatus and process schematic representation.
Fig. 2 be in Fig. 1 the parts of the serial number 1 i.e. A-A of pre-dedusting device to sectional view
Fig. 3 is that the B-B of Fig. 2 is to sectional view
In figure: 1, pre-dedusting device, 1.1, smoke inlet, 1.2, housing, 1.3, filtering material, 1.4, lower clapboard, 1.5, Upper spacer, 1.6, ash discharging hole, 2, denitration reaction tower, 3, static mixer, 4, low temperature catalyst room, 5, ammonia-gas spraying device, 6, ammonia still process Device, 7, dilution air, 8, denitrification reducing agent storage tank, 9, Heat Room, 10, drum, 11, jet chimney, 12, secondary water pipeline, 13, atomising device, 14, desulfurization reaction tower, 15, disintegrating machine, 16, unloading valve, 17, desulfurizing agent preparation and feedway, 18, desulfurization Agent case, 19, technique water tank, 20, cleaner unit, 21, dust-removal cloth-bag, 22, compressed air and injection apparatus, 23, unloading valve, 24, defeated Ash blower fan, 25, bulk cement storage tank, 26, regulating fan, 27, coke oven underground flue, 28, coke oven chimney;
G1, extract flue out, G2, denitration by-pass flue, G3, HRSG Inlet Duct, G4, waste heat by-pass flue, G5, de- Sulfur gas approach, G6, dedusting gas approach, G7, dedusting exhaust pass, G8, air return flues, G9, ash conveying pipe;
By F1, extraction flue electrodynamic valve F2, denitration by-pass flue electrodynamic valve F3, exhaust-heat boiler inlet electrodynamic valve F4, waste heat Smoke uptake electrodynamic valve F5, desulfurization gas approach electrodynamic valve F6, desulfurization exhaust pass electrodynamic valve F7, air return flues electrodynamic valve.
Detailed description of the invention
A kind of coke oven flue waste gas purification waste-heat recovery device of the present invention is by denitrification apparatus, waste-heat recovery device, desulfurization Device, dust arrester, ash conveying device, flue system, coke oven underground flue and coke oven chimney composition.
One end of extraction flue G1 connects coke oven underground flue 27 and the other end connects denitrification apparatus smoke inlet 1.1.De- Nitre device is provided with denitration reaction tower 2, and this denitration reaction tower 2 smoke inlet side is provided with pre-dedusting device 1.On in denitration reaction tower 2 Side is respectively equipped with ammonia-gas spraying device 5 and static mixer 3.And exhanst gas outlet side is provided with low temperature catalyst room 4 in denitration reaction tower 2. Ammonia steaming device 6 one end is connected with dilution air 7, denitrification reducing agent storage tank 8 respectively, and the other end is connected with ammonia-gas spraying device 5.Remove in advance The side of the housing 1.2 of dirt device 1 is provided with smoke inlet 1.1, is additionally provided with upper spacer 1.5 and lower clapboard 1.4 in housing 1.2.On Equipped with filtering material 1.3 between dividing plate 1.5 and lower clapboard 1.4.The lower end of pre-dedusting device 1 is provided with ash discharging hole 1.6.Waste heat boiler Gas approach G3 one end is connected with the outlet on the downside of the low temperature catalyst room 4 of denitrification apparatus, and the other end fills with waste heat recovery The side of the Heat Room 9 put is connected.The lower end of Heat Room 9 also is provided with ash discharging hole.The top of Heat Room 9 is provided with drum 10 and steams Steam pipe road 11 and secondary water pipeline 12.Desulfurization gas approach G5 one end is connected with the opposite side of the Heat Room 9 of waste-heat recovery device, And the other end connects the atomising device 13 above desulfurization reaction tower 14.Dedusting gas approach G6 one end connects desulfurization reaction tower 14 times Side, and the other end connects the entrance of cleaner unit 20.It is provided with dust-removal cloth-bag 21 in cleaner unit 20, is arranged over compressed air and injection Device 22.Air return flues G7 one end is connected above with cleaner unit 20, and the other end is connected with one end of regulating fan 26.Pressure regulation The other end of blower fan 26 is connected with coke oven underground flue 27, coke oven chimney 28 by air return flues G8.Bulk cement storage tank 25 lower end also sets There is ash discharging hole, be arranged over the ash conveying pipe G9 with defeated ash blower fan 24.Desulfurization reaction tower 14 lower end is through disintegrating machine 15, unloading valve 16 It is connected with ash conveying pipe G9.And the lower end of cleaner unit 20 is also connected with ash conveying pipe G9 through unloading valve 23.Desulfurizing agent preparation and confession To device 17 top through pipeline be connected with desulfurizing agent case 18 and technique water tank 19 respectively and bottom by pipeline and atomising device 13 Top connect.Also pipeline is had to be connected between feedway 17 with bulk cement storage tank 25.Because Desulphurization contains responseless desulfurization Agent, so can utilize partial desulfurization ash to enter desulfurizing agent preparation and feedway 17, make desulfurization slurry together with desulfurizing agent, Reach to save the purpose of desulfurizing agent.Divide between HRSG Inlet Duct G3, desulfurization gas approach G5 and dedusting exhaust pass G7 Lian Jie there be denitration by-pass flue G2, waste heat by-pass flue G4.Extract flue G1, denitration by-pass flue G2, exhaust-heat boiler inlet out On flue G3, waste heat by-pass flue G4, desulfurization gas approach G5, dedusting exhaust pass G7, air return flues G8, device is extracted out respectively Flue electrodynamic valve F1, denitration by-pass flue electrodynamic valve F2, exhaust-heat boiler inlet electrodynamic valve F3, waste heat by-pass flue electrodynamic valve F4, Desulfurization gas approach electrodynamic valve F5, desulfurization exhaust pass electrodynamic valve F6, air return flues electrodynamic valve F7.
The technological process using the said equipment to carry out coke oven flue waste gas purification waste heat recovery is:
From coke oven underground flue 27 draw waste gas, temperature at 230~300 DEG C, by flue system equipped with extract out cigarette The extraction flue G1 of road electrodynamic valve F1 enters after the pre-dedusting device 1 in denitrification apparatus carries out rough dusting, and through ammonia-gas spraying device 5 The ammonia sprayed into enters denitration reaction tower 2 together.In denitrification apparatus, waste gas mixed with ammonia is through being arranged on denitration dress After waste gas is sufficiently mixed by the static mixer 3 put, under the effect of the low temperature catalyst of low temperature catalyst room 4, ammonia Gas reacts with nitrogen oxides in effluent, completes denitration in denitration reaction tower 2.Waste gas after denitration from denitration reaction tower 2 end Portion out, configured waste heat entrance electrodynamic valve F3 in waste heat gas approach G3 enter the Heat Room 9 of waste-heat recovery device with The water that secondary water pipeline 12 feeds carries out heat exchange, and water is heated into steam water interface and produces steam in drum 10 by the waste heat of recovery Supply next stage equipment by jet chimney 11 to use.Waste gas after recovery waste heat is under the effect of regulating fan 26, through flue G5 and desulfurization entrance electrodynamic valve F5 enters desulfurizer, and waste gas is with that feed through desulfurizing agent preparation and feedway 17, through atomization The desulfurization slurry that device 13 atomization sprays into is sufficiently mixed, the acidic materials in removing waste gas.Through purifying and waste heat recovery useless Gas, sends coke oven underground flue 27 back to by regulating fan 26, discharges through coke oven chimney 28.Desulfurization reaction tower 14 pyramidal portion settles Dust and sack cleaner 20 except under dust concentrate through ash conveying device and to be transported to bulk cement storage tank 25, in case reuse or outward transport process.
Below in conjunction with the accompanying drawings, the technological process of detailed description coke oven flue waste gas purification waste heat recovery of the present invention:
The denitrification reducing agent fed by denitrification reducing agent storage tank 8, after ammonia steaming device 6 is evaporated to gas, with dilution air 7 The dilution wind fed sprays in denitrification apparatus through ammonia-gas spraying device 5 together, under the effect of static mixer 3, and through pre-dedusting The waste gas of device 1 enters denitration reaction tower 2 after being sufficiently mixed, and in denitration reaction tower 2, the low temperature in low temperature catalyst room 4 is urged Under the effect of agent, the denitrification reducing agent in denitrification reducing agent storage tank 8 and the reaction of nitrogen oxides in waste gas, generate harmless nitrogen Gas and water.Typical catalyst uses temperature range to be 320~420 DEG C, and EGT is less than 300 DEG C, and typical catalyst cannot Meeting requirement, therefore, for the coke oven exhaust gas less than 300 DEG C, the use temperature range of the low temperature catalyst that we use is 180 ~450 DEG C, low temperature catalyst is sulfur-tolerant type catalyst, in this temperature range and under high sulfur environment, can make low temperature waste gas denitration Efficiency reaches 60~95%, and optimal denitration efficiency can reach 95%.Mainly there is string leakage or abnormal when coke oven in pre-duster 1 In the case of, prevent flue dust from the catalyst in low temperature catalyst room 4 is caused damage.
The heat-pipe heat exchanger that waste-heat recovery device uses.The waste gas processed through denitration still carries substantial amounts of heat energy, Therefore, by the Heat Room 9 of waste-heat recovery device, the waste heat in waste gas is reclaimed.Secondary water pipeline 12 feeds waste heat and returns Receiving apparatus, carries out heat exchange with waste gas in Heat Room 9, and the secondary water 12 after heat absorption carries out steam-water separation in drum 10, produces Steam got rid of by jet chimney 11, can be directly used for productive life.After waste gas passes through waste-heat recovery device recovery waste heat, waste gas Temperature is down to less than 160 DEG C.
Desulfurization flow process is, uses the desulfurizing agent [calcium hydroxide (Ca (OH) in desulfurizing agent case 182) or ammonia (NH3.H2O)] With the fresh water (FW) in technique water tank 19, it is modulated into the lime slurry of 10%~20% concentration by slurrying and feedway 17, Good be 15% serosity, send into atomising device 13, spray into desulfurization reaction tower 14 and be fully contacted with the waste gas entered, remove in waste gas Acidic materials.Fall into the Intrapyramidal dust of desulfurization reaction tower 14 and send into ash conveying device through disintegrating machine 15, unloading valve 16, through fluidisation Blower fan 24, ash conveying pipe G9 send in bulk cement storage tank 25, in case reuse or outward transport.
Dust arrester uses sack cleaner 20, carries in the waste gas after denitration, waste heat recovery and desulfurization Dust, by sack cleaner 20, removes the dust in waste gas through cloth bag 21, and the dust being attached to outside cloth bag 21 is in compressed air 22 Effect under, drop into the bottom of cleaner unit 20, send into ash conveying device through unloading valve 23, under the effect of fluidized air blower 24, warp Ash conveying pipe G9 sends in bulk cement storage tank 25, in case reuse or outward transport.Coke oven exhaust gas is finally made to be purified, qualified discharge.
In flue system, regulating fan 26 is the power resources of package unit, and it is the guarantee of coking by coke oven desirable pressure. By regulating fan 26, it is provided that waste gas is through denitrification apparatus, waste-heat recovery device, desulfurizer, dust arrester and flue system The produced resistance of system, it is ensured that coking is in the pressure limit that it is allowed.
Ash conveying device is made up of fluidized air blower 24, ash conveying pipe G9 and bulk cement storage tank 26.Ash conveying device is by package unit The dust settling or filtering, is transported to specify position, in case reuse or outward transport.
The method that the present invention uses is low temperature sulfur-tolerant type catalyst denitration+waste heat recovery+semi-dry desulfurizing process.So, Not only meet the requirement processing waste gas, avoid deficiency of the prior art simultaneously, one, alkali metal (K, Na, Ca etc.) ion pair The impact of catalyst, easily makes catalyst poisoning, loses catalytic action;Two, eliminate because first desulfurization makes temperature reduction then need Afterburning is wanted to meet the requirement of denitration.Solve that the equipment investment in the presence of current techniques is big, equipment is complicated, the waste energy, de- Sulphur efficiency is the highest and secondary pollution problems.

Claims (7)

1. a coke oven flue waste gas purification waste heat recovery apparatus, including the coke oven underground flue being linked in sequence by flue system (27), denitrification apparatus, desulfurizer, dust arrester, be additionally provided with ash conveying device and coke oven chimney (28), it is characterised in that: in institute State and between denitrification apparatus with desulfurizer, be connected the retracting device that has surplus heat.
Coke oven flue waste gas purification waste heat recovery apparatus the most according to claim 1, it is characterised in that: described denitrification apparatus Being provided with denitration reaction tower (2), this denitration reaction tower (2) smoke inlet side is provided with pre-dedusting device (1), described denitration reaction tower (2) in, top is respectively equipped with ammonia-gas spraying device (5) and static mixer (3), and described denitration reaction tower (2) interior exhanst gas outlet side sets Low temperature catalyst room (4), one end of ammonia steaming device (6) is had to be connected with dilution air (7), denitrification reducing agent storage tank (8) respectively, and The other end is connected with described ammonia-gas spraying device (5).
Coke oven flue waste gas purification waste heat recovery apparatus the most according to claim 2, it is characterised in that: described pre-dedusting fills The side of the housing (1.2) putting (1) is provided with entrance (1.1), is additionally provided with upper spacer (1.5) and lower clapboard in housing (1.2) (1.4), equipped with filtering material (1.3) between described upper spacer (1.5) and lower clapboard (1.4), under described pre-dedusting device (1) End is provided with ash discharging hole (1.6).
Coke oven flue waste gas purification waste heat recovery apparatus the most according to claim 2, it is characterised in that: described low-temperature catalyzed Agent room (4) is built with the low temperature catalyst using temperature range to be 180~450 DEG C.
Coke oven flue waste gas purification waste-heat recovery device device systems the most according to claim 1, it is characterised in that: described Waste-heat recovery device includes that waste-heat recovery device includes Heat Room (9) and drum (10) placed on it.
Coke oven flue waste gas purification waste heat recovery apparatus the most according to claim 1, it is characterised in that: described desulfurizer It is provided with atomising device (13) and bottom is provided with the desulfurization reaction tower (14) of disintegrating machine (15) and unloading valve (16) including top;Desulfurization Agent preparation and feedway (17) top are connected with desulfurizing agent case (18) and technique water tank (19) and bottom is passed through respectively through pipeline Pipeline is connected with the top of described atomising device (13).
7. use the equipment described in claim 1 to carry out a technique for coke oven flue waste gas purification waste heat recovery, will be from coke oven The flue gas that underground flue (27) is extracted out enters denitrification apparatus through flue system, carries out denitration in denitrification apparatus, it is characterised in that:
1) flue gas after denitration is discharged into waste-heat recovery device carries out waste heat recovery in denitration reaction tower (2) bottom;
2) after reclaiming, flue-gas temperature is down to less than 160 DEG C, enters desulfurization reaction tower (14) along flue and is prepared by desulfurizing agent and supply Feed atomising device (13) desulfurization slurry to device (17) to mix, the sulfur in abjection flue gas, send into atomising device (13) Desulfurizing agent is by the desulfurizing agent calcium hydroxide (Ca (OH) in desulfurizing agent case (18)2) with the fresh water (FW) being placed in technique water tank (19) Being modulated into desulfurization slurry, its concentration range is 10%~20%;
3) the desulfurizing agent ammonia (NH also can being placed in desulfurizing agent case (18)3.H2O) with the technique being placed in technique water tank (19) It is 10%~20% that water is modulated into the concentration range of desulfurization slurry;
4) above-mentioned 2) with 3) in the case of, described in be modulated into the concentration optimum of desulfurization slurry be 15%;
5) subsequently into dust arrester dedusting, the flue gas after purification, by the regulating fan (26) in flue system, sends coke oven back to Underground flue (27), discharges through coke oven chimney (28).
CN201610782094.1A 2016-08-31 2016-08-31 A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique CN106178877A (en)

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