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

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

Active Publication Date: 2011-08-31
SHANGHAI HANXING CHEM TECH CO LTD
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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 for coal bed gas producing natural gas
  • Two stage low pressure method for coal bed gas producing natural gas
  • Two stage low pressure method for coal bed gas producing natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, see attached figure 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, activ...

Embodiment 2

[0030] Embodiment 2, see attached figure 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 coa...

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Abstract

The invention discloses a method for producing natural gas from coal bed gas with a two-stage low pressure method capable of concentrating the coal bed gas with extremely low CH4 content at a low pressure to the natural gas concentration, namely over 99%, and keeping an extremely high CH4 recovery, which is characterized by the following: adopting two-stage low pressure CH4 gas absorption and concentration series cycle of operation; loading 2-3 species high effective CH4 gas sorbent in an absorption tower at each concentration stage; concentrating CH4 gas at a low pressure less than 0.05MPa. G, and adopting vacuum regeneration mode to obtain the CH4 gas with high concentration. The two-stage structure comprises: 1) obtaining the CH4 gas product with high concentration through absorption and concentration and vacuum regeneration technique in the former stage, at the same time further purifiying vent gas of the former stage as raw material gas for the rear stage, obtaining the CH4 with higher concentration after concentration at the rear stage, then returning to the former stage as raw material gas for the former stage to recycle and concentrate; 2) obtaining CH4 gas intermediate product with relative higher concentration through absorption and concentration and vacuum regeneration technique at the former stage as raw material gas for the rear stage, further concentrating, the vent gas at the rear stage returning to the former stage to continue to concentrate.

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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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/295
Inventor 敖元
Owner SHANGHAI HANXING CHEM TECH CO LTD
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