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Two stage low pressure method coal bed gas producing natural gas method

A coalbed methane and natural gas technology, applied in the field of two-stage low-pressure coalbed methane production of natural gas, can solve energy waste, environmental protection problems and other problems, and achieve high recovery effect

Active Publication Date: 2008-01-02
上海汉兴化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only causes a lot of waste of energy, but also due to CH 4 Gas is a strong greenhouse gas, so it also poses serious environmental problems

Method used

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  • Two stage low pressure method coal bed gas producing natural gas method
  • Two stage low pressure method coal bed gas producing natural gas method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, see accompanying drawing 1:

[0022] The first two-stage low-pressure coalbed methane production method for natural gas consists of two low-pressure CH 4 The gas adsorption and enrichment section is formed by series circulation; the product natural gas is produced in the former section, and the intermediate product after enrichment in the later section is returned to the previous section as raw material gas.

[0023] This method per CH 4 The gas stripping and concentration section consists of 2 filled with 2-3 kinds of CH 4 It consists of an adsorption tower for gas adsorbent, a buffer tank, a vacuum pump and several program-controlled valves for switching control. The front section is equipped with a raw material buffer tank 3, a vacuum pump 4, a natural gas buffer tank 5, and an air release buffer tank 6; the rear section is equipped with a vacuum pump 4 and an intermediate product buffer tank 7. The adsorbent in the adsorption tower is silica gel, ac...

Embodiment 2

[0030] Embodiment 2, see accompanying drawing 2:

[0031] The second two-stage low-pressure coalbed methane production method consists of two low-pressure CH 4 The gas adsorption and enrichment section is formed by series circulation; the coalbed methane is initially purified in the front section to obtain intermediate product gas, and then the intermediate product gas is used as the raw material of the subsequent section to purify natural gas, and the air released in the latter section is returned to the previous section as raw material gas.

[0032]The front section adopts the intermediate product buffer tank 7, and others are the same as in embodiment 1; the rear section adopts the natural gas buffer tank 5, and the others are the same

[0033] Both the front section and the back section adopt the following vacuum regeneration process, as follows:

[0034] The second two-stage low-pressure method for producing natural gas from coalbed methane. The coalbed methane from the ...

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Abstract

The invention discloses a preparing method of natural gas from coal bed gas with two stage low pressure method, which is characterized by the following: adopting two stage low pressure CH4 gas absorption series cycle of operation; loading 2-3 species high effective CH4 gas sorbent in each department absorption tower; proceeding CH4 gas dense lift with pressure not more than 0.05MPa. G; adopting vacuum regeneration mode; getting CH4 gas with high density; comprising two department structure; getting CH4 gas with high density; setting the drained air as the raw gas of the back department; purifying in the back department; getting CH4 gas with high density; backing to the front department; using as raw gas of the front department; purifying as the front department; using middle product as raw material of the back department; backing the drained air to the front department; purifying continuously as the back department.

Description

technical field [0001] The invention relates to a method for producing natural gas (high-concentration methane) from coal-bed methane with a two-stage low-pressure method. technical background [0002] At present, in the patent documents or reported technical materials published at home and abroad, there is no technology that can achieve: CH 4 The concentration of coalbed methane with a concentration lower than 50%, or even as low as 10%, is enriched to natural gas with a methane content of more than 90%, and at the same time, the methane recovery rate index of more than 95% can be achieved. [0003] my country is a big country of coal production, and there is a large amount of by-product coalbed methane in coal production, most of which are CH 4 The contents are all lower than 50%, and some are even as low as 10%. This part of the gas is due to CH 4 The gas concentration is low and the oxygen content is high, so it is difficult to use directly, and most of them are usuall...

Claims

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Application Information

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IPC IPC(8): E21B43/295
Inventor 敖元
Owner 上海汉兴化工科技有限公司
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