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Method for purifying marsh gas by membrane separating technology

A membrane separation and biogas technology, which is applied in separation methods, membrane purification/separation, chemical instruments and methods, etc., can solve the problems of complex equipment, troublesome process, large investment, etc., and achieve the effect of simplified equipment, good effect and low investment

Inactive Publication Date: 2007-09-05
张晓忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods do show great advantages when dealing with large-scale natural gas projects, but for small and medium-sized natural gas projects, especially biogas purification projects, it seems that the investment is large, the equipment is complicated, and the process is troublesome.

Method used

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  • Method for purifying marsh gas by membrane separating technology

Examples

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Embodiment 1

[0023] 10,000Nm per day 3 Take biogas for vehicles as an example, the original biogas is 18000Nm 3 . Designed to treat biogas capacity of 760Nm 3 / h, equipment investment 2 million yuan, including the purchase and installation of all equipment, meters and pipelines in "2-9" in the process flow chart, excluding plant, land, and equipment foundation. The membrane separator of the key equipment (8) uses hollow fiber membrane modules made in the United States, and the others are domestic or self-made equipment. Original gas tank (1) The composition of Zhongyuan biogas is stable in CH 4 55-60%, CO 2 30-38%, H 2 O(g)2-3%, H 2 S 500-1500PPm. After purification, the gas scrubber (9) reaches CH 4 ≥97%, CO 2 ≤3%, H 2 S≤15mg / Nm 3 , The dew point of normal pressure is -13℃. The total methane recovery rate of the equipment reaches more than 80%. It can be filled with 600 bottles of biogas for vehicles, with a bottle volume of 70L and a pressure of 200MPa, equivalent to 14Nm 3 Natural gas, equi...

Embodiment 2

[0025] Nissan's civil bottled biogas 2000Nm 3 For example, 3600Nm of original biogas is required 3 , The designed biogas capacity is 160Nm 3 / h, equipment investment is 500,000 yuan, only one-stage membrane separator is used, other equipment and operating conditions are the same as in Example 1, but the size is smaller. Biogas CH after purification 4 Content ≥90%, CO 2 ≤10%, the yield can be increased to more than 90%, and can be filled with 300 bottles of civil biogas. Bottle volume 70L, pressure 10Mpa, 7Nm 3 Natural gas is equivalent to 12L liquefied petroleum gas.

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Abstract

A process for cleaning the marsh gas in order to use it as non-toxic fuel features that a membrane separation technique is used for separating CH4, CO2, H2O and H2S from marsh gas.

Description

Technical field: [0001] The invention relates to a method for purification of biogas, which belongs to the downstream biological separation engineering technology. The original biogas passes through a selective gas separation membrane to remove CO 2 , H 2 O and a small amount of H 2 S, to achieve the purpose of purification, for the later process to compress the production of biogas for vehicles or for civilian use. Background technique: [0002] There is no precedent for biogas purification in my country, and few people have studied it. Because my country's biogas is mainly used for domestic fuel and power generation, there is no need for deep purification, only preliminary desulfurization and dehydration, without removing carbon dioxide. However, if biogas is to be used as vehicle fuel, it must meet the national standard of "Compressed Natural Gas for Vehicles", and deep purification is required. [0003] Biogas purification technology, mainly to remove CO 2 And a small amount ...

Claims

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Application Information

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IPC IPC(8): B01D53/22C07C7/144C07C9/04C12M1/107C02F11/04
CPCY02C10/10Y02E50/343C12M47/18Y02E50/30
Inventor 张晓忠
Owner 张晓忠
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