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Method for purifying and separating methane from oxygen-containing coal-bed gas

A technology for separating methane and coalbed methane, which is used in distillation purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc. It can solve the problems of insufficient technical maturity, poor technical economy, and high cost of deep deoxygenation

Inactive Publication Date: 2009-09-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current technical means for deoxidation in coalbed methane include: catalytic oxidation and chemical conversion, etc., but deep deoxidation has problems such as high cost, poor technical economy, and insufficient technical maturity. For coalbed methane containing more oxygen, Low-concentration coal-bed methane has not seen any industrial-scale application examples

Method used

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  • Method for purifying and separating methane from oxygen-containing coal-bed gas
  • Method for purifying and separating methane from oxygen-containing coal-bed gas
  • Method for purifying and separating methane from oxygen-containing coal-bed gas

Examples

Experimental program
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Effect test

Embodiment 1

[0072] An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed methane first enters the refrigeration system of the device 1 to cool down, then enters the rectification tower 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification tower Tail gas, liquid pure methane flows out from the bottom of the rectification tower.

[0073] First determine the most explosive position in the separation system. The most explosive position is determined by the known temperature and pressure distribution of each tray of the rectification column under normal operating conditions, as well as the liquid and gas in each tray. concentration and calculated by formula (3) and formula (4) to obtain the critical explosion point on each tray, comparing the critical explosion point of each tray, the position in the separation system corresponding to the lowest critical explosion point is the easiest The l...

Embodiment 2

[0080] An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed methane first enters the refrigeration system of the device 1 to cool down, then enters the rectification tower 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification tower Tail gas, the tail gas enters the cooling capacity recovery system of the device 1 to recover cooling capacity. In this embodiment, both the refrigeration system and the cooling capacity recovery system are in the equipment 1, and liquid pure methane flows out from the bottom of the rectification tower.

[0081] First determine the most explosive position in the separation system. The most explosive position is determined by the known temperature and pressure distribution of each tray of the rectification column under normal operating conditions, as well as the liquid and gas in each tray. concentration and calculated by formula (3) and formula (...

Embodiment 3

[0087]An oxygen-containing coalbed methane mixture, the oxygen-containing coalbed gas first enters the refrigeration system of the device 1 to cool down, then enters the rectification system 2 to be separated into tail gas and liquid pure methane, and flows out from the tail gas outlet point 2' at the top of the rectification system Tail gas, liquid pure methane flows out from the bottom of the rectification system.

[0088] The calculation process is as follows:

[0089] See Example 2 for the establishment of the oxygen-containing coalbed methane coordinate area.

[0090] See Example 2 for the establishment method of the explosion triangle in the initial state of oxygen-containing coalbed methane. The initial concentrations of methane, oxygen and nitrogen in the feed gas mixture of oxygen-containing coalbed methane are 8%, 5% and 87% respectively, and the initial state of the tail gas outlet is For normal temperature and pressure.

[0091] First, according to the initial co...

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Abstract

The invention provides a method for safely purifying and separating methane from oxygen-containing coal-bed gas, which includes the steps of cooling feed gas of the oxygen-containing coal-bed gas firstly and then rectifying the oxygen-containing coal-bed gas: a)the original volume concentration y<0> of methane in the feed gas is detected; b) the volume concentration Y of the methane is adopted as an abscissa, and the volume concentration X of the oxygen is adopted as an ordinate, which are used for building a coordinate region aimed at the oxygen-containing coal-bed gas in the process flow of separation technology and determining a corresponding explosion triangle of the oxygen-containing coal-bed gas in the original state; c) when y<0> is in an oxygen-inadequate area of the coordinate area, noncombustible articles are added to the feed gas which are to be cooled; and d) the proportions of the noncombustible articles are maintained and the methane is safely separated from the feed gas added with the noncombustible articles. With the adoption of the method, the methane can be safely purified and separated from the oxygen-containing coal-bed gas without deoxidization pretreatment of the feed gas, thus reducing the cost.

Description

technical field [0001] The invention relates to a method for safely purifying and separating methane from oxygen-containing coal bed gas, and belongs to the technical field of separation and purification of mixed gases. Background technique [0002] Coalbed methane belongs to unconventional natural gas, that is, natural gas that is generated during the formation and evolution of coal, has not been migrated, and exists in the coal seam in an adsorbed state. The main components of coalbed methane are methane, nitrogen and oxygen, and it is a clean and high-calorific energy source. my country's coalbed methane resources are very rich, and the basic reserves are equivalent to conventional natural gas. There are two extraction methods for coalbed methane: one is surface extraction, and the purity of methane in coalbed methane can reach about 98%. This kind of coalbed methane has a relatively high utilization value, and it can be directly pressurized for pipeline network transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C7/00C07C7/04
Inventor 吴剑峰公茂琼孙兆虎
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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