Method for closed-circuit microorganism desulfurization and elemental sulfur recovery

A closed-circuit circulation and microbial technology, applied in the field of green environmental protection technology, can solve the problems of by-product generation of sulfate waste liquid, poor desulfurization efficiency stability, waste gas unorganized emission, etc., achieve the recovery of sulfur resources, reduce environmental secondary pollution, Effects of resource recycling

Active Publication Date: 2018-01-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] In order to solve the problems of low desulfurization efficiency, high cost, poor stability of desulfurization efficiency, high energy consumption, unorganized emission of waste gas, and generation of by-products of sulfate waste liquid in the prior art, the present invention adopts chemical absorption-biological oxidation-membrane separation- Anaerobic reduction coupling technology proposes a closed-loop microbial desulfurization method that can remove sulfur-containing gases and completely convert them into elemental sulfur

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  • Method for closed-circuit microorganism desulfurization and elemental sulfur recovery

Examples

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Effect test

Embodiment 1

[0035] Embodiment 1 biogas desulfurization process

[0036] The crude biogas (v / v) to be treated is produced by straw bio-fermentation, its main component is: 40% CO 2 , 0.6%H 2 S, 59.4% CH 4 , the biogas pressure is normal pressure.

[0037] 100 Nm 3 / h biogas enters the chemical absorption tower, the pH value of the lye is 8.6, and the circulation volume is 57.7 L / h. The chemical absorption of hydrogen sulfide is realized through gas-liquid countercurrent contact. Rich H 2 The lye of S enters the biological regeneration tower, and the HS - In air aeration rate 0.08m 3 / h, the ORP value is maintained in the range of -340mV~-360mV, the conductivity is stable at about 32mS / cm, and the HS - Biological oxidation to elemental sulfur. The top exhaust gas is directly discharged into the atmosphere after defoaming spray. The elemental sulfur is separated by centrifugation, and the filtrate enters the membrane separation filter. The operating pressure is 1.0 MPa, the operatin...

Embodiment 2

[0043] Example 2 Sulfur-containing industrial waste gas biological desulfurization process

[0044] To be treated is the mixed waste gas (v / v) of pesticide production enterprises, and its main components are: 30% CO 2 , 2%H 2 S, 68%N 2 ;Exhaust gas pressure: 0.1MPa.

[0045] 100 Nm 3 / h Sulfur-containing industrial waste gas enters the chemical absorption tower, the pH value of the lye is 9.0, and the circulation volume is 0.19 m 3 / h Through gas-liquid countercurrent contact, the chemical absorption of hydrogen sulfide is realized. Rich H 2 The lye of S enters the biological regeneration tower, and the HS - In air aeration rate 0.27m 3 / h, the ORP value is maintained in the range of -340mV~-360mV, the conductivity is stable at about 41 mS / cm, and the HS -Biological oxidation to elemental sulfur. The top exhaust gas is directly discharged into the atmosphere after defoaming spray. The elemental sulfur is separated by centrifugation, and the filtrate enters the membra...

Embodiment 3

[0046] Example 3 High-carbon and high-sulfur natural gas biological desulfurization process

[0047] The high-carbon and high-sulfur natural gas (v / v) to be processed is extracted from natural gas wells, and its main components are: 40% CO 2 , 8%H 2 S, CS 2 / CH 3 SH / COS 2000ppm, 52% N 2 . Natural gas pressure: 4.0 MPa.

[0048] 100 Nm 3 / h High-carbon and high-sulfur natural gas enters the chemical absorption tower, the pH value of the alkali solution is 9.0, and the circulation volume is 30.75 m 3 / h Through gas-liquid countercurrent contact, the chemical absorption of hydrogen sulfide is realized. Rich H 2 The lye of S enters the bioaerobic reactor, HS - In air aeration volume 43.4 m 3 / h, the ORP value is maintained in the range of -330mV~-350mV, the conductivity is stable at about 56 mS / cm, and the HS - Biological oxidation to elemental sulfur. The top exhaust gas is directly discharged into the atmosphere after defoaming spray. The elemental sulfur is separat...

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Abstract

The invention belongs to the environmental protection industry and the field of three-waste environmental protection purification, and relates to a method for closed-circuit microorganism desulfurization and elemental sulfur recovery, particularly to a process for biological desulfurization treatment of sulfur-containing industrial gases (such as biogas, natural gas, coal chemical industry processgas, refinery gas, sulfur-containing industrial waste gas, and the like, wherein the purposes of closed-circuit biological desulfurization, maximized recovery of elemental sulfur, standard emission of waste gas and near-zero emission of waste liquids can be achieved through chemical absorption, biological oxidation, elemental sulfur recovery, membrane separation, anaerobic reduction and other processes. According to the present invention, the treatment method can meet the biological desulfurization requirements, can solve the difficult problem of elemental sulfur production through sulfide oxidation and enhanced separation, and can be used for biogas, natural gas, coal-to-gas, refinery gas, sulfur-containing industrial waste gas and other industrial large-scale engineering.

Description

technical field [0001] The invention belongs to the green environmental protection technology and is applied in the field of environmental protection purification, and specifically relates to a biogas desulfurization, natural gas, shale gas, coal chemical process gas and catalytic dry gas of refineries, pharmaceuticals, chemical fertilizers, printing and dyeing, etc. for large and medium-sized biogas projects. A purification treatment method for gaseous fluids containing hydrogen sulfide such as industrial sulfur-containing waste gas such as beer. Background technique [0002] Biogas, natural gas, shale gas, coal chemical process gas and other effective fuel gases and refinery catalytic dry gas, pharmaceuticals, fertilizers, printing and dyeing, beer and other industrial sulfur-containing waste gases have varying degrees of hydrogen sulfide, due to the odor of hydrogen sulfide, toxic gas The existence of gas is very corrosive to metal pipes, gas storage cabinets and gas equi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52B01D53/78B01D53/96B01D53/73
CPCY02C20/20
Inventor 孔京郝爱香毛松柏孔凡敏
Owner CHINA PETROLEUM & CHEM CORP
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