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Process for recovering hydrogen sulfide form anaerobic fermentation methane

An anaerobic fermentation, hydrogen sulfide technology, applied in hydrogen sulfide, gas fuel, petroleum industry and other directions, can solve problems such as high cost, operator injury, combustion equipment corrosion, etc., to improve environmental protection processes, reduce manufacturing costs, and reduce pressure Effect

Inactive Publication Date: 2008-11-19
RIZHAO JINHE BOYUAN BIOCHEM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In the existing anaerobic fermentation, a large amount of combustible gas will be produced due to the chemical reaction of the fermenting bacteria itself. Therefore, biogas can be used as a new energy source to alleviate the energy crisis. However, due to the generation of combustible gas and waste water Sulfur-containing organic matter or sulfate ions in wastewater will also be converted into hydrogen sulfide, and a large amount of hydrogen sulfide gas will be produced. As we all know, hydrogen sulfide gas is a highly toxic gas that can cause death, and it is mixed with sulfide Biogas of hydrogen gas will be oxidized into corrosive acid gas when it is burned for power generation or converted into other energy sources, which will cause serious corrosion to the combustion equipment and cause harm to the operator's body. In order to deal with anaerobic fermentation biogas For hydrogen sulfide in gas or gas, the following methods are generally used: 1. Alkali absorbs hydrogen sulfide, and the absorbed solution is sent to an aerobic process; 2. Iron oxide dry desulfurization is used to obtain sulfur and then incinerated; 3. 1. Direct incineration of hydrogen sulfide into sulfur dioxide emission; 4. The solution after the lye absorbs hydrogen sulfide is sent to the Parker biological desulfurization reactor to prepare sulfur; although the above-mentioned treatment process can remove hydrogen sulfide in biogas, the cost is relatively high At the same time, it will discharge acid gas that pollutes the atmosphere, or produce low-value-added sulfur, etc., which makes the existing hydrogen sulfide treatment process not worth the candle, and also increases the pollution to the environment

Method used

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  • Process for recovering hydrogen sulfide form anaerobic fermentation methane
  • Process for recovering hydrogen sulfide form anaerobic fermentation methane

Examples

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Effect test

Embodiment 1

[0035] A sewage treatment plant with a biogas output of 1000m 3 / h, hydrogen sulfide content in biogas 5000mg / m 3 , The methane also contains 60% (v / v) of methane, 30-35% (v / v) of carbon dioxide, and 5% (v / v) of water.

[0036] 1. The biogas first passes through the gas-water separator, and then enters the 2m 3 The alkaline acid washing tank is equipped with 1% sodium hydroxide solution by weight fraction in the tank, and the gas residence time of each cubic meter of biogas in the tank is 10 seconds.

[0037] 2. There are two absorption towers ( ), each level of absorption tower is equipped with a stirring return tank. The biogas first enters the first-stage absorption tower (1# tower), and the biogas from the first-stage absorption tower enters the second-stage absorption tower (2# tower). When the pH value of the absorption liquid in the first-stage absorption tower (1# tower) is less than 9.0, the hydrogen sulfide concentration in the biogas is detected, and when the h...

Embodiment 2

[0045] A sewage treatment plant with a biogas output of 300m 3 / h, hydrogen sulfide content in biogas 2000mg / m 3 , The biogas also contains 50% (v / v) of methane, 40-45% (v / v) of carbon dioxide, and 5% (v / v) of water.

[0046] 1. The biogas first passes through the gas-water separator, and then enters 1m 3 The alkaline washing acid tank is equipped with 5% sodium carbonate solution, and the gas residence time of each cubic meter of biogas in the tank is 15 seconds.

[0047] 2. There are three-stage absorption towers ( ), each level of absorption tower is equipped with a stirring return tank. The biogas first enters the first-stage absorption tower (1# tower), the biogas from the first-stage absorption tower enters the second-stage absorption tower (2# tower), and the biogas from the second-stage absorption tower enters the third-stage absorption tower (3# Tower). When the pH value of the absorption liquid in the first-stage absorption tower (1# tower) is less than 9.0, th...

Embodiment 3

[0053] A sewage treatment plant with a biogas output of 500m 3 / h, the content of hydrogen sulfide in biogas is 4000mg / m 3 , The biogas also contains methane content of 45% (v / v), carbon dioxide content of 40-45% (v / v), and water content of 5% (v / v).

[0054] 1. The biogas first passes through the gas-water separator, and then enters 1m 3 Alkaline acid washing tank, the tank is filled with 1% potassium hydroxide solution.

[0055] 2. There are two-stage absorption towers ( ), each level of absorption tower is equipped with a stirring return tank. The biogas first enters the first-stage absorption tower (1# tower), the biogas from the first-stage absorption tower enters the second-stage absorption tower (2# tower), and the biogas from the second-stage absorption tower enters the third-stage absorption tower (3# Tower). When the pH value of the absorption liquid in the first-stage absorption tower (1# tower) is less than 9.0, the hydrogen sulfide concentration in the bioga...

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Abstract

The invention relates to a hydrogen sulfide recovery process, particularly to a novel method for recovering hydrogen sulfide from anaerobic fermented biogas. The method comprises the step of countercurrent absorption of hydrogen sulfide-containing biogas with a sodium-containing alkaline solution as an eluent. The inventive method can effectively elute hydrogen sulfide gas from biogas to clean the biogas, and can produce sodium hydrosulfide with high added value.

Description

technical field [0001] The invention relates to a tail gas recovery process, in particular to a method for recovering hydrogen sulfide from anaerobic fermentation biogas which produces hydrogen sulfide. Background technique [0002] In many industries, such as the fermentation industry and the sewage treatment industry, anaerobic fermentation is relatively common. Anaerobic fermentation refers to the fermentation of materials by fermentation bacteria in an environment with no oxygen or only trace oxygen. Traditional anaerobic fermentation The process is to pass the sewage containing organic matter into a closed or semi-closed container, and make the sewage contact with the anaerobic bacteria in the anaerobic reactor through mechanical stirring, pump circulation or biogas-driven circulation, so that the anaerobic bacteria will COD Degradation produces biogas. [0003] In the existing anaerobic fermentation, a large amount of combustible gas will be produced due to the chemic...

Claims

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Application Information

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IPC IPC(8): C01B17/16C10L3/00
Inventor 寇光智李昌涛安丰民周昊
Owner RIZHAO JINHE BOYUAN BIOCHEM
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