CN102743969A - Treatment method for mixed waste gas containing H2S and CS2 - Google Patents
Treatment method for mixed waste gas containing H2S and CS2 Download PDFInfo
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- CN102743969A CN102743969A CN201210245947XA CN201210245947A CN102743969A CN 102743969 A CN102743969 A CN 102743969A CN 201210245947X A CN201210245947X A CN 201210245947XA CN 201210245947 A CN201210245947 A CN 201210245947A CN 102743969 A CN102743969 A CN 102743969A
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- absorption tower
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Abstract
The invention discloses a treatment method for a mixed waste gas containing H2S and CS2. The treatment method comprises the following steps of: (1) charging the to-be-treated mixed waste gas in a primary absorption tower, spraying a Na2HCO3 aqueous solution in the primary absorption tower simultaneously, and enabling the Na2HCO3 aqueous solution to be in countercurrent contact with the waste gas, so as to absorb the H2S within the waste gas; (2) conveying a liquid phase absorbing the gas-phase H2S in the primary absorption tower into a recovery liquid tank, and then separating to obtain elemental sulphur; (3) conveying the mixed gas removing the H2S in the primary absorption tower into at least one of at least two parallel absorbers, and obtaining a purified gas through the absorption of the absorber; and (4) charging water vapour in the absorber with saturated absorption to desorb, thus obtaining a water vapour mixture. According to the invention, the Na2HCO3 aqueous solution is used as a liquid-phase catalyst for absorbing the H2S in the waste gas, so that the content of the H2S can be reduced to be less than 10 ppm from 1-6 g/m<3> (about 659-3953 ppm); and the oxygen of the absorbers is removed by means of the replacement of inert gas (such as N2 or CO2), so that the desorption process (and/or) a drying process are in an oxygen-poor state, thus ensuring the running safety of the adsorption devices.
Description
Technical field
The present invention relates to a kind of H of containing
2S and CS
2The processing method of mix waste gas.
Background technology
Existing H
2In the S recovery method, generally adopt NaOH or Na
2CO
3Be used to absorb H wherein as absorbent
2S, liquid NaHS heat drying becomes solid-state NaHS product, but because flow process is oversize, and expense is higher, generally no longer depths reason, just discharging; And CS
2Owing to be insoluble in water, use the absorption process clearance minimum separately, also discharging in the lump.1), Taiwan a company installed a cover retracting device in Weifang, Shandong domestic existing processing method is following:, the method that adopts alkali to absorb obtains vulcanized sodium (NaHS) and directly is used for sewage disposal.But do not reclaim CS
2, cause tail row still to exceed standard.2), the catalytic oxidation process for treating of rope company of Denmark Top, it is more thorough to handle sulphur-containing exhaust gas.But cost is very high, and domestic enterprise is beyond affordability.3), University of Fuzhou, institute of Fujian ring section, Hebei Chemical Engineering College have the technology of report, the especially University of Fuzhou of improvement technology also once to do pilot scale in 1996 in the chemical fibre factory, Nan Ping, but never drop into the industrialization operation.
Summary of the invention
The purpose of this invention is to provide a kind of H of containing
2S and CS
2The processing method of mix waste gas, it utilizes and absorbs the method that adds absorption and come this type of integrated treatment organic exhaust gas, makes the waste gas qualified discharge, and recyclable utilization utility wherein.
A kind of H that contains provided by the present invention
2S and CS
2The processing method of mix waste gas, comprise the steps:
(1) pending mix waste gas is fed to first grade absorption tower, in said first grade absorption tower, spray NaHCO simultaneously
3The aqueous solution is used to absorb H wherein with the waste gas counter current contacting
2S;
(2) absorption in the said first grade absorption tower gas phase H
2The liquid phase of S gets into and reclaims in the flow container, obtains elemental sulfur through separating then;
(3) removed H in the said first grade absorption tower
2The gaseous mixture of S enters at least one absorber of at least 2 absorbers of parallel connection, is filled with active carbon in the said absorber; After the absorption of said absorber, promptly obtain removing H
2S and CS
2Purge gas;
(4) in adsorbing saturated said absorber, feed water vapour and carry out desorb, obtain water vapor mixture after the desorb; Said water vapor mixture obtains CS through condensation and after separating
2Solution.
In the above-mentioned processing method, said first grade absorption tower comprises at least 1 ~ 2 layers of void tower layer, and is not blocked to guarantee the absorption tower.
In the above-mentioned processing method, said gaseous mixture is being fed to the said absorber, said method also comprises said gaseous mixture fed to two-level absorption tower, perhaps feeds the step to the two-level absorption tower of series connection and the three grades of absorption towers successively; After said one-level to three grade absorption tower absorbs, the H in the tail gas after absorbing
2S concentration can be reduced to below the 10ppm, to guarantee the normal operation of follow-up adsorption step.
In the above-mentioned processing method, said two-level absorption tower and three grades of absorption towers include one to four layer of random packing layer.
In the above-mentioned processing method, said liquid phase obtains elemental sulfur through said regeneration tank separation; Said elemental sulfur reclaims through sulfur melting kettle and obtains sulphur.
In the above-mentioned processing method; Before in said absorber, feeding water vapour; Said method also comprises the step that the feeding inert gas carries out emptying in said absorber, so that follow-up desorption process and/or dry run are in the oxygen deprivation state, guarantees the security of absorber operation.
In the above-mentioned processing method, said inert gas specifically can be adopted as N
2Or CO
2
In the above-mentioned processing method, the adsorbent in the said absorber specifically can be granular activated carbon or NACF.
In the above-mentioned processing method, said water vapor mixture obtains condensed fluid after condenser condenses, and said condensed fluid promptly gets CS through the gravity separator separation
2
The present invention has following beneficial effect:
1, adopts NaHCO
3The aqueous solution is used for the H of absorbing waste gas as liquid-phase catalyst
2S can make its content by 1～6g/m
3(about 659～3953ppm) drop to below the 10ppm;
2, according to H in the mix waste gas
2The difference of S concentration can adopt one-level absorption, secondary to absorb the perhaps technical scheme of three grades of absorptions;
3, adopt inert gas (like N
2Or CO
2) method of replacement gets rid of the oxygen of absorber, make desorption process (and/or) dry run is in the oxygen deprivation state, guarantees the security of adsorbent equipment operation.
Description of drawings
Fig. 1 is the flow chart of mix waste gas processing method provided by the invention.
The specific embodiment
Employed experimental technique is conventional method like no specified otherwise among the following embodiment.
Used material, reagent etc. like no specified otherwise, all can obtain from commercial sources among the following embodiment.
The H that contains provided by the invention
2S and CS
2The flow chart of processing method of mix waste gas as shown in Figure 1; To contain H
2S and CS
2The mixing organic exhaust gas after the blower fan back pressure, be introduced in the first grade absorption tower, this first grade absorption tower comprises two-layer void tower layer, in this first grade absorption tower, sprays NaHCO simultaneously
3The H that is used for absorbing waste gas in the aqueous solution
2S; After first grade absorption tower absorbs, obtain liquid phase and gaseous mixture, wherein, remove H
2S contains CS
2Gaseous mixture continue to feed to two-level absorption tower, this two-level absorption tower comprises random packing tower layer, in this two-level absorption tower, sprays NaHCO simultaneously
3The aqueous solution is used for the H of further absorbing waste gas
2S; , two-level absorption tower obtains liquid phase and gaseous mixture after absorbing; Wherein, Get into after the liquid phase that here obtains and the liquid-phase mixing that after first grade absorption tower absorbs, obtains and reclaim in the flow container; Flow into regeneration tank then and separate and obtain elemental sulfur, the liquid after separating can continue to feed to first grade absorption tower and two-level absorption tower and carries out recycling, and elemental sulfur obtains sulphur through the sulfur melting kettle processing and reclaims; H in the gas phase after two-level absorption tower absorbs
2The concentration of S enters to this gas in 2 absorbers of parallel connection less than 10ppm then simultaneously, is filled with granular activated carbon in these 2 absorbers, is used for adsorbing the CS of waste gas
2, the gas after can being purified after the absorption of absorber; After 2 absorber absorption are saturated, in 2 absorbers, feed N respectively earlier
2Carry out emptying,, guarantee the security of absorber operation so that follow-up desorption process and/or dry run are in the oxygen deprivation state; In 2 absorbers, feed water vapour respectively then, be used for the CS that adsorbs on the desorb active carbon
2, obtain water vapor mixture after the desorb and flow in the condenser, obtain condensed fluid through condensation, isolate moisture through gravity separator then, promptly recyclable CS
2
In processing procedure of the present invention, the H in the tail gas after two-level absorption tower absorbs
2When the concentration of S still is higher than 10ppm, can the gas phase after separating be continued to be fed in three grades of absorption towers and carry out H
2The absorption of S, wherein, these three grades of absorption towers also are random packing tower layers; CS in absorption waste gas
2The time, can be provided with as the case may be in the absorber of a plurality of parallel connections, meet emission standards to guarantee waste gas after treatment.
Claims (9)
1. one kind contains H
2The processing method of the mix waste gas of S and CS2 comprises the steps:
(1) pending mix waste gas is fed to the absorption tower, in said absorption tower, spray NaHCO simultaneously
3The aqueous solution is used to absorb H wherein with the waste gas counter current contacting
2S;
(2) absorption in the said absorption tower gas H
2The liquid phase of S gets into and reclaims in the flow container, obtains elemental sulfur through separating then;
(3) removed H in the said absorption tower
2The gaseous mixture of S enters at least one absorber of at least 2 absorbers of parallel connection; Through said absorption tower absorbing and removing H
2S and absorber adsorbing and removing CS
2After promptly be purified gas row to atmosphere;
(4) in adsorbing saturated said absorber, feed water vapour and carry out desorb, obtain water vapor mixture after the desorb; Said water vapor mixture obtains CS through condensation and after separating
2
2. processing method according to claim 1 is characterized in that: said first grade absorption tower comprises at least 1 ~ 2 layers of void tower layer.
3. processing method according to claim 1 and 2; It is characterized in that: before said gas phase feeding to said absorber; Said method also comprises said gaseous mixture fed to two-level absorption tower, perhaps feeds the step to the two-level absorption tower of series connection and the three grades of absorption towers successively.
4. processing method according to claim 3 is characterized in that: said two-level absorption tower and three grades of absorption towers include one to four layer of random packing layer.
5. according to arbitrary described processing method among the claim 1-4, it is characterized in that: said liquid phase obtains elemental sulfur through said regeneration tank separation; Said elemental sulfur reclaims through sulfur melting kettle and obtains sulphur.
6. according to arbitrary described processing method among the claim 1-5, it is characterized in that: before in said absorber, feeding water vapour, said method also comprises the step that the feeding inert gas carries out emptying in said absorber.
7. processing method according to claim 6 is characterized in that: said inert gas is N
2Or CO
2
8. according to arbitrary described processing method among the claim 1-7, it is characterized in that: the adsorbent in the said absorber is granular activated carbon or NACF.
9. according to arbitrary described processing method among the claim 1-8, it is characterized in that: said water vapor mixture obtains condensed fluid after condenser condenses, and said condensed fluid promptly gets CS through the gravity separator separation
2Liquid.
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| CN201210245947XA CN102743969A (en) | 2012-07-16 | 2012-07-16 | Treatment method for mixed waste gas containing H2S and CS2 |
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|---|---|---|---|
| CN201210245947XA CN102743969A (en) | 2012-07-16 | 2012-07-16 | Treatment method for mixed waste gas containing H2S and CS2 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331078A (en) * | 2013-07-05 | 2013-10-02 | 宜宾海丝特纤维有限责任公司 | Device for recovery of carbon disulfide in viscose fiber production |
| CN103721524A (en) * | 2014-01-23 | 2014-04-16 | 石家庄科英化工技术有限公司 | Recycling treatment method of CS2 and H2S in waste gas in production of viscose fiber |
| CN103920361A (en) * | 2014-03-31 | 2014-07-16 | 龚䶮 | Desorption method, recycling method and recycling device of carbon disulfide |
| CN108114570A (en) * | 2017-04-12 | 2018-06-05 | 南京大学 | One kind contains CS for handling2And H2The method of S mixed pollutants exhaust gas |
| CN109173648A (en) * | 2018-10-15 | 2019-01-11 | 常州大学 | A kind of carbon disulfide and hydrogen sulfide composite exhaust gas processing unit |
| CN110052119A (en) * | 2019-03-26 | 2019-07-26 | 昆明理工大学 | Organic solvent absorbs hydrogen sulfide and the method for the utilization of resources in concentrate commercial acid gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331078A (en) * | 2013-07-05 | 2013-10-02 | 宜宾海丝特纤维有限责任公司 | Device for recovery of carbon disulfide in viscose fiber production |
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| CN103721524A (en) * | 2014-01-23 | 2014-04-16 | 石家庄科英化工技术有限公司 | Recycling treatment method of CS2 and H2S in waste gas in production of viscose fiber |
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| CN108114570A (en) * | 2017-04-12 | 2018-06-05 | 南京大学 | One kind contains CS for handling2And H2The method of S mixed pollutants exhaust gas |
| CN108114570B (en) * | 2017-04-12 | 2020-01-31 | 南京大学 | methods for treating plants containing CS2And H2S mixed pollutant waste gas method |
| CN109173648A (en) * | 2018-10-15 | 2019-01-11 | 常州大学 | A kind of carbon disulfide and hydrogen sulfide composite exhaust gas processing unit |
| CN110052119A (en) * | 2019-03-26 | 2019-07-26 | 昆明理工大学 | Organic solvent absorbs hydrogen sulfide and the method for the utilization of resources in concentrate commercial acid gas |
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Application publication date: 20121024 |