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Technology of low temperature separation and concentration coal layer gas to produce methane

A coalbed methane, low temperature technology, applied in distillation purification/separation, petroleum industry, recovery of liquid hydrocarbon mixture, etc., can solve the problems of not getting methane product, unable to meet the requirement of rectification reflux ratio, etc.

Inactive Publication Date: 2006-01-11
HAO HUA CHENGDU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is mainly used for the separation process of coal bed methane (CMM) with high methane concentration (above 65%). When the methane concentration of CMM is low, to obtain methane products with a purity of more than 95%, the reboiler only relies on raw material CMM The evaporation amount of heating cannot meet the reflux ratio required by rectification, so methane products with a content of more than 95% cannot be obtained

Method used

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  • Technology of low temperature separation and concentration coal layer gas to produce methane
  • Technology of low temperature separation and concentration coal layer gas to produce methane
  • Technology of low temperature separation and concentration coal layer gas to produce methane

Examples

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Embodiment 1

[0016] After desulfurization, oxygen removal, decarburization, and drying (water removal), coalbed methane forms CH 4 50% (the remainder is N 2 ). The raw material gas pressure is 4.0MPa(g), and the separation tower pressure is 2.0MPa(g). Product methane concentration is 99% (the remainder is N 2 ), yield 95%. The nitrogen content in the waste nitrogen gas at the top of the tower is greater than 95%. The temperature of the feed gas entering the tower is 139K, the temperature of the bottom of the tower is 164K, and the temperature of the top of the tower is <122K. The auxiliary circulation pressure is 2.4MPa(g), and the circulation volume is about 30% of the feed gas volume. The inlet temperature of the expander is 163K, the pressure after expansion is 0.5MPa(g), and the outlet temperature is 127K.

Embodiment 2

[0018] After desulfurization, oxygen removal, decarburization, and drying (water removal), coalbed methane forms CH 4 56% (the remainder is N 2 ). The raw material gas pressure is 4.0MPa(g), and the separation tower pressure is 2.0MPa(g). Product methane concentration is 95% (the remainder is N 2 ), yield > 97%. The temperature of the feed gas entering the tower is 140K, the temperature of the bottom of the tower is 155K, and the temperature of the top of the tower is 120K. The auxiliary circulation pressure is 2.4MPa(g), and the circulation volume is about 10% of the feed gas volume. The inlet temperature of the expander is 154K, the pressure after expansion is 0.5MPa(g), and the outlet temperature is 119K.

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Abstract

A process for low-temp separation of methane from coal seam gas and concentrating it includes such steps as removing O2, pressurizing, desulfurizing, decarbonizing, drying. Low-temp separation to obtain liquid methane, flowing in the condenser on the tower top for using it as the cold source of condensing reflux, and flowing the evaporated methane through heat exchanger to obtain product. Its purity is 95-99%. Its recovery rate is 95-99%.

Description

[0001] The invention belongs to the technical field of gas separation, in particular to a technological process for separating concentrated gas by low-temperature rectification. Background technique [0002] Coalbed methane (CMM-Coal Mine Gas) is a methane-rich gas with a methane concentration of over 40%, and the highest can reach over 80%. Usually it can be directly used as civil fuel and power generation. If it is to be used as chemical industry or as automobile fuel, the concentration of methane must be increased to more than 95%. Due to the limited use of civil fuel, a lot of coalbed methane has not been well utilized, which not only caused a lot of waste of resources, but also caused environmental pollution and aggravated the greenhouse effect. In order to fully utilize the resource of coalbed methane (CMM), the methane in the coalbed methane must be enriched to more than 95%. Because coalbed methane contains air and other components, for the sake of safety, oxygen shou...

Claims

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Application Information

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IPC IPC(8): C10G5/06C07C7/04C07C9/04F25J3/02
Inventor 陶鹏万王晓东黄建彬
Owner HAO HUA CHENGDU TECH
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