Separation method of methane from coal bed methane-air mixture and system thereof

A separation method and coal-bed methane technology, applied in the chemical industry, can solve problems such as explosion and difficulty in adoption, and achieve the effects of reducing energy consumption, saving investment, operating space and lowering requirements for operating procedures

Inactive Publication Date: 2016-04-20
CHINA UNIV OF PETROLEUM (BEIJING)
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AI Technical Summary

Problems solved by technology

The existing hydrate separation method can make the separation of air-mixed coalbed methane in a water-saturated environment, but because the separation of hydrates needs to be carried out unde

Method used

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  • Separation method of methane from coal bed methane-air mixture and system thereof
  • Separation method of methane from coal bed methane-air mixture and system thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Hydrate working fluid is tetrabutylammonium bromide (English abbreviation: TBAB), and its concentration is 10wt%;

[0041] The composition of mixed gas is shown in Table 1 below:

[0042] Table 1 Composition of mixed air CBM

[0043] composition

[0044] use as figure 1 The process flow and figure 2 For the specific process, please refer to the description of the above separation method, and the process parameters involved are as follows:

[0045] 1) The pressure of mixed air CBM is 0.5MPa.

[0046] 2) When the hydrate working fluid enters the hydration reactor, the temperature is 8°C and the pressure is 3.0MPa.

[0047] 3) The pressure of the hydrate working fluid passing through the throat section of the hydration reactor is 0.4MPa.

[0048] 4) The pressure of the fluid formed by the hydrate working fluid and the methane in the mixed gas in the stable section of the hydration reactor is 2.5 MPa.

[0049] 5) The operating temperature of the hydrate sep...

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Abstract

The invention provides a separation method of methane from coal bed methane-air mixture and a system thereof. The separation method includes a step of performing a hydration reaction to the coal bed methane-air mixture and collecting methane-rich gas. A hydration reactor for the hydration reaction has a structure that a chamber in the hydration reactor is divided into an inlet section, a throat tube section and a stable section in the flowing direction of a hydrate work fluid, wherein the flow area in the throat tube section is less than that of the inlet section and the stable section. A gas inlet is formed in the side wall corresponding to the throat tube section in the chamber of the hydration reactor. By means of the separation method, a step of compressing and pressurizing the coal bed methane-air mixture when the methane is separated from the coal bed methane-air mixture through a hydrate separation method in the prior art, thereby avoiding risk of explosion during compressing and high-pressure flowing processes of the coal bed methane-air mixture. The method is safe in operation and is excellent in practical industrial application availability.

Description

technical field [0001] The invention relates to a method and system for separating methane in air-mixed coal bed gas, belonging to the technical field of chemical industry. Background technique [0002] Coal Bed Methane (CBM for short), also known as coal mine gas or mine gas, is produced in the coal-forming process and mainly exists in coal seams in an adsorbed state. It is an unconventional natural gas resource with methane as the main component. [0003] At present, the main methods of mining coalbed methane are surface drilling and underground extraction. Surface drilling technology is widely used in the development of coalbed methane in foreign countries. However, China's geological conditions are complex, and most of the coal seams have relatively poor air permeability. Restricted by technology and geological conditions, the current development of coalbed methane in China is mostly used underground Extraction technology. The methane content in coalbed methane obtaine...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/72C10L3/10
Inventor 郭绪强张孔明霍玉生
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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