Coal bed gas separating system and process

Abstract

The invention belongs to the field of separation of mixed gases, and particularly relates to a system and a process for separating coal bed gas, particularly coal bed gas with low CH4 content. The coal bed gas separating system comprises a compressing and purifying device, an O2 removing device, a purifying and deoiling device, a CH4 separating system and a product conveying system. O2 contained in the coal bed gas is fully removed by using the O2 removing device, and CH4 in the coal bed gas is kept to be maximum extent; and the CH4 separating system is a variable-pressure adsorption system or a film separating system, so that components in the coal bed gas can be separated, the energy consumption is low, the potential safety hazard in the exploiting process of coal bed gas is eliminated, and CH4 contained in the coal bed gas can be utilized to be maximum extent.

Description

technical field [0001] The invention belongs to the field of separation and purification of mixed gases, and in particular relates to a separation system and process of coalbed methane, especially suitable for low CH content 4 Separation of coalbed methane. Background technique [0002] Coalbed methane, commonly known as "gas", is an unconventional natural gas that is associated with coal and stored in the coal seam in an adsorbed state. Its calorific value is 2-5 times that of general coal. 2 21 times the destructive power of the ozone layer is CO 2 7 times. According to the estimates of relevant departments, the national coal mine gas emissions to air account for the total industrial production of CH 4 About 1 / 3 of the emissions. In February 2005, the "Kyoto Protocol" came into force, and my country is facing increasing pressure to "reduce emissions". At the same time, as a non-renewable resource, coal-bed methane has been used directly or concentrated and enriched by...

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Problems solved by technology

[0010] For this reason, the technical problem to be solved by the present invention lies in the problem that coalbed methane containing low concentration methane is not suitable for deoxidation by combustion method in the prior art, and then provides a deoxygenation 2 completely, while CH 4 The loss is the lowest, and CH 4 CBM separation equipment with better separation effect;

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