Technology for desorbing acid gas in methane

A technology of acid gas and biogas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of poor operation stability of the device, loss of effective components, poor operation stability, etc., achieve no corrosion of equipment, reduce consumption, and improve recovery rate Effect

Inactive Publication Date: 2012-03-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

Chinese patent ZL200710012457.4 discloses biogas purification equipment and its purification process. This process uses MDEA to purify biogas, but the MDEA used in this process is easily degraded by oxygen in the biogas, and the operation stability of the device is poor.
Chinese patent ZL01103983.3 discloses a process and device for preparing methane-enriched gas from garbage biogas. This method uses propylene carbonate and polyethylene glycol dimethyl ether to treat biogas. However, the process has a high absorption rate of methane, resulting in biogas The loss of effective components in the medium is relatively large, and the yield of total hydrocarbons is low
[0007] At present, the desulfurization and decarbonization process of biogas generally has the problems of low recovery rate, poor operation stability and high equipment cost

Method used

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  • Technology for desorbing acid gas in methane
  • Technology for desorbing acid gas in methane
  • Technology for desorbing acid gas in methane

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The raw material biogas 70 in the present embodiment is made up of the following components of volume percentage: 60% CH 4 , 39% CO 2 , the balance of other gases, the content of hydrogen sulfide is 1800mg / Nm 3 . The absorption solvent is composed of the following components in mass fraction: N-formylmorpholine 70%, N-acetylmorpholine 30%.

[0042] figure 1 It is a schematic flow chart of the method in this embodiment. First pass the raw material biogas 70 into the mixed absorption tower 10 for desulfurization and decarbonization. The pressure inside the mixed absorption tower 10 is 2.5MPa, the temperature is 25°C, and the volume ratio of the raw material biogas to the absorption solvent is 2-4:1. The obtained purified biogas 80 is drawn from the top of the mixed absorption tower 10 , while the absorbed absorption solvent is discharged from the bottom of the mixed absorption tower 10 . The absorbed absorption solvent first enters the atmospheric pressure gas-liquid...

Embodiment 2

[0045] The absorption solvent used in this embodiment is composed of the following components by mass fraction: 67-70% of N-formylmorpholine, 27-30% of N-acetylmorpholine, and 2-4% of water. The volume ratio of the raw biogas to the absorption solvent is 1-4:1, and the other conditions are the same as in Example 1. In the final purified and enriched product gas, CH 4 Content ≥ 96%, CO 2 Content ≤ 3%, H 2 S content≤5mg / Nm 3 , total sulfur content≤200mg / Nm 3 , Methane recovery rate ≥ 94%.

Embodiment 3

[0047] The absorption solvent used in this embodiment is composed of the following components in mass fraction: 96-98% of N-formylmorpholine, and 2-4% of water. The volume ratio of the raw biogas to the absorption solvent is 1-3:1, and the other conditions are the same as in Example 1. In the final purified and enriched product gas, CH 4 Content ≥ 96%, CO 2 Content ≤ 3%, H 2 S content≤5mg / Nm 3 , total sulfur content≤200mg / Nm 3 , Methane recovery rate ≥ 94%.

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Abstract

The invention discloses a technology for desorbing acid gas in methane, aiming at solving the problem that the existing desulfuration and decarburization technology of methane is generally low in recovery rate, poor in operation stability, and higher in equipment cost. The technology comprises the following steps of: (1) absorbing: leading the methane and lyosorption in an absorption tower to be reversely contacted with each other, so that the acid gas-desorbed methane and acid lyosorption can be obtained at the top and the bottom of the absorption tower respectively; and (2) desorbing: regenerating the acid lyosorption obtained in the step (1) by at least one step of depressurizing, heating, inert gas stripping, desorbing the acid gas in the acid lyosorption, and leading the regenerated lyosorption to be recycled enter in the absorption tower in the step (1). The technology can be used for effectively desulfuring and decarburizing the methane, is less in alkane loss, high in recovery rate, simple to operate, good in stability and small in equipment investment, and the production cost can be effectively reduced.

Description

technical field [0001] The invention relates to the field of biogas purification, in particular to a process for removing acid gas in biogas. Background technique [0002] Biogas is a kind of green and environmentally friendly renewable energy. After purification, it can be used as residential fuel, industrial fuel, vehicle fuel, power generation fuel and chemical raw material, so as to make up for energy shortage and protect the environment. [0003] Livestock manure, biochemical waste and urban domestic waste are usually used as raw materials for biogas fermentation. The biogas produced by fermentation usually contains 55-70% methane, 30-45% carbon dioxide, a small amount of ammonia, hydrogen, carbon monoxide, and Hydrogen sulfide, mercaptans, thiophenols, thioethers, etc. In the biogas produced by different raw materials, the content of hydrogen sulfide is also different, usually the content of hydrogen sulfide is 1.5 ~ 8g / m 3 . [0004] The removal of acid gases in bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/14
Inventor 李毅朱林黄超明陈春玉刘杨王玲肖英程长明
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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