CN107469588A - SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration - Google Patents

SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration Download PDF

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Publication number
CN107469588A
CN107469588A CN201610397764.8A CN201610397764A CN107469588A CN 107469588 A CN107469588 A CN 107469588A CN 201610397764 A CN201610397764 A CN 201610397764A CN 107469588 A CN107469588 A CN 107469588A
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China
Prior art keywords
gas
tail gas
concentration
heat
passed
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CN201610397764.8A
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Chinese (zh)
Inventor
颜长青
朱晓渊
周超
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Shanghai Baosteel Chemical Co Ltd
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Shanghai Baosteel Chemical Co Ltd
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Priority to CN201610397764.8A priority Critical patent/CN107469588A/en
Publication of CN107469588A publication Critical patent/CN107469588A/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
    • B01D53/46Removing 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
    • 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
    • B01D53/02Separation 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 adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation 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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • 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
    • B01D53/26Drying gases or vapours
    • 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
    • B01D53/76Gas phase processes, e.g. by using aerosols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/025Other waste gases from metallurgy plants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/40Further details for adsorption processes and devices
    • B01D2259/40083Regeneration of adsorbents in processes other than pressure or temperature swing adsorption

Abstract

The invention provides one kind can reduce SO in industrial tail gas2The device of concentration, including waste-heat recovery device, humidification purifier, drying device, process gas blower fan, heat-exchange device, reformer apparatus, absorption tower and the cooler being sequentially communicated, wherein, the absorption tower is also connected with a device for recovering tail gas, and the device for recovering tail gas reversely connects with humidification purifier.Compared with prior art, the present invention has following beneficial effect:1st, sulfuric acid tail gas is after absorption, can qualified discharge, reduce environmental risk;2nd, conventional exhaust gas processing device is substituted with device for recovering tail gas, avoids the consumption of ammonia gas and water, meanwhile, waste liquid is no longer produced, has saved cost for wastewater treatment;3rd, shorten acid-making process flow, reduce construction investment.

Description

SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration
Technical field
The present invention relates to one kind can reduce SO in industrial tail gas2The device of concentration and its vent gas treatment side Method, belong to field of environment engineering technology.
Background technology
At present, typically there are two sets of sulphur slurry acid-making process in smelting iron and steel enterprise, and respectively traditional " two Turn two to inhale " and " one turn one inhale " acid-making process.
Wherein, " one turn of one suction " technique, as shown in figure 1, containing SO2Process gas by electricity After heating, conversion and absorption, SOXRemoval efficiency general about 97%, the tail gas that absorption tower comes out needs elder generation By exhaust gas desulfurization tower, the SO in 5.5~7% ammoniacal liquor and in tail gas from absorption tower is usedx, generation Containing (NH4)2SO3、(NH4)2SO4Deng the waste liquid of salt, tail gas passes through ammonia neutralizing tower again afterwards, Using clear water by remaining ammonia and SOxWashing is got off, final tail gas qualified discharge.
" double conversion double absorption " technique, as shown in Fig. 2 being that will contain SO2Process gas pass through first Electric heater heats, each layer of inverted device and the first absorption tower, then, then by secondary heater, Converter and second absorption tower, SOXRemoval efficiency is up to 99.85%, and relieving haperacidity tail gas is up to standard directly to be discharged.
Either " one turn one suction " technique still " double conversion double absorption " technique, similar slurries burning process All there are the following problems:With low concentration SO2Gas relieving haperacidity, the reaction heat of itself can not meet that heat is put down Weighing apparatus, it is necessary in addition heating could convert, so, operation energy consumption height.
In addition, " one turn one suction " sulphur slurry acid-making process must be provided with exhaust gas processing device, not only feed consumption, Power consumption, and produce waste liquid.
To solve the above problems, Chinese patent CN102743956A discloses a kind of active coke desulphurizing again Angry process for preparing sulfuric acid, the technique are the SO sent out from regeneration blower fan2Flue gas, cool through heat pipe boiler Enter gas purge system to 170~190 DEG C;Flue gas is by venturi scrubber with internal injection, foaming tower cooling dedusting After carry out demisting;Flue gas and supplement air are mixed into 36~40 DEG C and contain 8~9%SO after demisting2Gas passes through Enter conversion system, conversion ratio 96~97% after drying;Gas enters to absorb through economizer after conversion is System, produce finished product sulfuric acid;Absorb the rear molding pneumatic transmission time main desulfurizer of flue gas and further remove SO2, row Empty SO2Less than 200mg/m3
The patent vent gas treatment mode is similar with current general smelting iron and steel enterprise sulfur process, by tail gas Stream passes through special SO2In removal device, ensure that tail gas is qualified, but can not be to SO2Recycled, Cause the wasting of resources.And the improvement of this patent is essentially consisted in after carrying out absorption concentration to tail gas and entered back into Sulfur process, it is therefore intended that ensure that tail gas is qualified while improves process gas concentration to reduce sulfuric acid apparatus Operating cost.
The content of the invention
It is an object of the invention to provide one kind can reduce SO in industrial tail gas2The device and its tail gas of concentration Processing method, to solve the above mentioned problem in the presence of prior art.
The present invention is achieved by the following technical solutions:
Waste heat recovery dress that is a kind of to reduce the device of SO2 concentration in industrial tail gas, including being sequentially communicated Put, the purifier that is humidified, drying device, process gas blower fan, heat-exchange device, reformer apparatus, Absorption tower and cooler, it is characterised in that the absorption tower is also connected with a device for recovering tail gas, The device for recovering tail gas is reversely connected with humidification purifier by an absorbent charcoal adsorber. Preferably, the heat-exchange device is heat exchanger or heater.
Preferably, the absorbent charcoal adsorber includes adsorption tower and desorber, the absorption The top of tower is connected with the bottom of desorber.
Preferably, the bottom of the adsorption tower is connected with the outlet on absorption tower.
Preferably, the desorber with humidification purifier be connected.
Preferably, it is filled with adsorbing medium in the adsorption tower.
Preferably, the adsorbing medium is activated carbon or alkanolamine solution.
It is a kind of to reduce SO in industrial tail gas as foregoing2The exhaust gas treating method of the device of concentration, it is wrapped Include following steps:
S1:After sulfuric acid process gas is passed through into waste-heat recovery device recovery waste heat, humidification purification dress is passed through Put and interior carry out humidification purified treatment;
S2:Continue to be passed through in drying device and processing is dried, after removing steam, pass through process gas Blower fan, which is transferred in heat-exchange device, carries out heat exchange;
S3:After continuing to be passed through and sulfur dioxide gas being aoxidized in reformer apparatus, be passed through absorption tower It is interior to absorb sulfur trioxide gas into being cooled down after sulfuric acid, collect finished product sulfuric acid;
S4:Not oxidized sulfur dioxide gas is passed through in device for recovering tail gas, by adsorption tower and The absorption and desorption of desorber, isolate steam and sulfur dioxide gas, steam are discharged, by dioxy Change sulphur gas to be passed through in humidification purifier, be prepared into again by step S1, S2 and S3 processing Sulfuric acid.
Stripping gas is compounded into acid manufacturing processes gas, can be with SO in lifting process gas2Concentration 0.5~1.0%, i.e.,:SO in sulphur slurry acid manufacturing processes gas2Concentration can be brought up to from 5.0~5.5% 5.5~6.0%, so as to improve the reaction heat of acid manufacturing processes, the use of heater is greatly reduced, reduces Operation energy consumption.
The present invention general principle be:From combustion of sulfur generation sulfur dioxide, the life of sulfur dioxide catalysis oxidation Every single step reaction that sulfuric acid is made to sulfur trioxide absorption into sulfur trioxide is all exothermic reaction, and total is anti- Should heat about 500KJ/mol.
Wherein, the thermochemical equation of sulfur dioxide catalysis oxidation generation sulfur trioxide is as follows:
2SO2+O2=2SO3+Q
The reaction is that reaction heat Q is 162 (J/mol) at 0 DEG C, and Q numerical value is to change with temperature , when between 400~700 DEG C of temperature, heat of reaction can be calculated with following formula:
Q=101341.49-2.2lT
In formula:T-absolute temperature (K);
Reaction heat Q can raise reformed gas temperature, the SO in reaction heat Q size and gas2 Content is relevant.
As the SO for entering a converter2Concentration rises 1%, and heat of reaction accounts for the rising of overall reaction heat 3%, it can effectively reduce the operating load of electric heater 3~5%, about 30kW.
The characteristics of utilizing " one turn of one suction " acid-making process short, reclaims the SO in tail gas2Afterwards, supplying system In sour process gas, the SO of process gas is improved2Gas concentration and reaction heat, reduce in acid manufacturing processes Additional heat, reduce plant running energy consumption.
Secondly, the SO in tail gas is reclaimed2While, tail gas SOxEmission request, tail gas can be reached Recovery substitutes exhaust gas processing device, final to realize energy-conservation, consumption reduction and environment-friendly new demand.
Therefore, compared with prior art, the present invention has following beneficial effect:
1st, sulfuric acid tail gas is after absorption, can qualified discharge, reduce environmental risk;
2nd, conventional exhaust gas processing device is substituted with device for recovering tail gas, avoids the consumption of ammonia gas and water, Meanwhile waste liquid is no longer produced, save cost for wastewater treatment;
3rd, shorten acid-making process flow, reduce construction investment.
Brief description of the drawings
Fig. 1 is the flow chart of " one turn of one suction " in the prior art sulfuric acid preparation technology;
Fig. 2 is the flow chart of " double conversion double absorption " sulfuric acid preparation technology in the prior art;
Fig. 3 is the structural representation of the present invention;
Fig. 4 is the flow chart of " one turn of one suction " sulfur process after the present invention improves;
Fig. 5 is tail gas SO in the present invention2The process chart of removal process.
In figure:1st, waste-heat recovery device;2nd, be humidified purifier;3rd, drying device;4th, process Air fan;5th, heat-exchange device;6th, reformer apparatus;7th, absorption tower;8th, cooler;9、 Device for recovering tail gas;10th, absorbent charcoal adsorber.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to this The technical staff in field further understands the present invention, but the invention is not limited in any way.It should refer to Go out, to those skilled in the art, without departing from the inventive concept of the premise, Various modifications and improvements can be made.These belong to protection scope of the present invention.
The production firm of absorbent charcoal adsorber in the present invention is middle smelting vast of heaven international project Limited Liability Company, the production firm of activated carbon is activated carbon company of Shanxi Xinhua.
One kind of the present invention can reduce SO in industrial tail gas2The structure of the device of concentration such as Fig. 3 institutes Show, including be sequentially communicated waste-heat recovery device 1, humidification purifier 2, drying device 3, process Air fan 4, heat-exchange device 5, reformer apparatus 6, absorption tower 7 and cooler 8, wherein, Absorption tower 7 is also connected with a device for recovering tail gas 9, device for recovering tail gas 9 and humidification purifier 2 are reversely connected by an absorbent charcoal adsorber 10, i.e., gas can only be flowed to by device for recovering tail gas and increased Wet purification device.
Absorbent charcoal adsorber includes adsorption tower and desorber, the top of adsorption tower and the bottom of desorber It is connected;The bottom of adsorption tower is connected with the outlet on absorption tower;Desorber be humidified purifier It is connected.
Embodiment 1
One kind reduces SO in industrial tail gas based on foregoing2The exhaust gas treating method of the device of concentration, such as Shown in Figure 4 and 5, it comprises the following steps:
S1:Sulfuric acid process gas (is contained into SO2Industrial tail gas) be passed through waste-heat recovery device return After receiving waste heat, it is passed through in humidification purifier and carries out humidification purified treatment;
S2:Continue to be passed through in drying device and processing is dried, after removing steam, pass through process gas Blower fan, which is transferred in heat-exchange device, carries out heat exchange;
S3:After continuing to be passed through and sulfur dioxide gas being aoxidized in reformer apparatus, be passed through absorption tower It is interior to absorb sulfur trioxide gas into being cooled down after sulfuric acid, collect finished product sulfuric acid;
S4:Not oxidized sulfur dioxide gas is passed through in device for recovering tail gas, by adsorption tower and The absorption and desorption of desorber, isolate steam and sulfur dioxide gas, steam are discharged, by dioxy Change sulphur gas to be passed through in humidification purifier, be prepared into again by step S1, S2 and S3 processing Sulfuric acid, step S1, the repeatable operations of S2 and S3 are multiple, until the titanium dioxide in the gas given off The content minimum even 0 of sulphur.
Wherein, active carbon absorption technology is mainly by absorbing, desorbing and sulfur recovery three parts form.Flue gas Adsorption tower is introduced by booster fan, sprays into ammonia before adsorption column inlet, absorption tower by cup, middle room and Rear chamber forms, and flue gas is successively by so as to be purified, the flue gas after purification enters smoke stack emission.It is living Property charcoal is added in absorption tower by tower top, and is moved down in the presence of gravity and bottom of towe drawing mechanism. Absorb SO2, heavy metal etc. the communicated device of activated carbon be sent to Analytic Tower.
The effect of Analytic Tower is by the SO of charcoal absorption2Discharge, at the same in suitable temperature and Under the conditions of residence time etc., dioxin decomposable asymmetric choice net about 80%, activated carbon recycles again after screening. Need that it is heated and cooled down in this process.The SO discharged2It is net into sulfuric acid humidification Makeup is put, and the communicated device of the activated carbon after parsing is sent to absorption tower and is re-used to absorb SO2And NOX Deng.
In summary, only presently preferred embodiments of the present invention, not it is used for limiting implementation of the present invention Scope, carried out by all shapes according to described in scope of the invention as claimed, construction, feature and spirit Equivalent changes and modifications, it all should be included in scope of the presently claimed invention.

Claims (8)

1. one kind can reduce SO in industrial tail gas2The device of concentration, including the waste heat being sequentially communicated return Receiving apparatus, humidification purifier, drying device, process gas blower fan, heat-exchange device, converter Device, absorption tower and cooler, it is characterised in that the absorption tower also with a device for recovering tail gas phase Connection, the device for recovering tail gas are reversely connected with humidification purifier by an absorbent charcoal adsorber.
2. SO in industrial tail gas can be reduced as claimed in claim 12The device of concentration, its feature It is, the heat-exchange device is heat exchanger or heater.
3. SO in industrial tail gas can be reduced as claimed in claim 12The device of concentration, its feature It is, the absorbent charcoal adsorber includes adsorption tower and desorber, the top of the adsorption tower and solution The bottom for inhaling tower is connected.
4. SO in industrial tail gas can be reduced as claimed in claim 32The device of concentration, its feature It is, the bottom of the adsorption tower is connected with the outlet on absorption tower.
5. SO in industrial tail gas can be reduced as claimed in claim 32The device of concentration, its feature It is, the desorber is connected with humidification purifier.
6. SO in industrial tail gas can be reduced as claimed in claim 32The device of concentration, its feature It is, adsorbing medium is filled with the adsorption tower.
7. SO in industrial tail gas can be reduced as claimed in claim 62The device of concentration, its feature It is, the adsorbing medium is activated carbon or alkanolamine solution.
8. SO in industrial tail gas can be reduced as described in any one in claim 1~72The dress of concentration The exhaust gas treating method put, it is characterised in that comprise the following steps:
S1:After sulfuric acid process gas is passed through into waste-heat recovery device recovery waste heat, humidification purification dress is passed through Put and interior carry out humidification purified treatment;
S2:Continue to be passed through in drying device and processing is dried, after removing steam, pass through process gas Blower fan, which is transferred in heat-exchange device, carries out heat exchange;
S3:After continuing to be passed through and sulfur dioxide gas being aoxidized in reformer apparatus, be passed through absorption tower It is interior to absorb sulfur trioxide gas into being cooled down after sulfuric acid, collect finished product sulfuric acid;
S4:Not oxidized sulfur dioxide gas is passed through in device for recovering tail gas, by adsorption tower and The absorption and desorption of desorber, isolate steam and sulfur dioxide gas, steam are discharged, by dioxy Change sulphur gas to be passed through in humidification purifier, be prepared into again by step S1, S2 and S3 processing Sulfuric acid.
CN201610397764.8A 2016-06-07 2016-06-07 SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration Pending CN107469588A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109316897A (en) * 2018-11-10 2019-02-12 江西瑞达新材料有限公司 A kind of organic solvent two stage cycle recovery system
CN110935265A (en) * 2019-12-25 2020-03-31 贵州圣济堂制药有限公司 Harmless and pollution-free treatment system for pharmaceutical emissions

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109316897A (en) * 2018-11-10 2019-02-12 江西瑞达新材料有限公司 A kind of organic solvent two stage cycle recovery system
CN110935265A (en) * 2019-12-25 2020-03-31 贵州圣济堂制药有限公司 Harmless and pollution-free treatment system for pharmaceutical emissions

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Application publication date: 20171215