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

A technology for separating methane and coalbed methane, applied in distillation purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve problems such as 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 tech

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
Comparison scheme
Effect test

Embodiment 1

[0071] 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.

[0072] 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

[0079] 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.

[0080] 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 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, tail gas enters the cooling capacity recovery system of the device 1 to recover the cooling capacity of the tail gas, and liquid pure methane flows out from the bottom of the rectification system. In this embodiment, the refrigeration system and the cooling capacity recovery system are all arranged in the device 1 .

[0088] The calculation process is as follows:

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

[0090]The establishment method of the explosive triangle explosion in the initial state of oxygen-containing coalbed methane is shown in Example 2. The initial concentrations...

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Abstract

The invention provides a method for purifying and separating methane from oxygen-containing coal bed gas, the method comprises the following steps of firstly cooling raw material gas of the oxygen-containing coal bed gas and then carrying out rectification treatment on the oxygen-containing coal bed gas; exhaust gas flows out from the top part of a rectification system, pure methane flows out from the bottom part of the rectification system, a) the initial volume concentration y<0> of the methane in the raw material gas is detected; b) the volume concentration Y of the methane is taken as an x-coordinate and the volume concentration X of oxygen is taken as a y-coordinate for establishing the coordinate region against the oxygen-containing coal bed gas in the separation process flow and determining an explosion triangle in the corresponding coordinate region of the oxygen-containing coal bed gas in the initial state; c) when the y<0> is positioned in the oxygen deficiency region of the coordinate region of the oxygen-containing coal bed gas at the position, the oxygen in the raw material gas to be cooled is removed; and d) the volume concentration of the methane is maintained, and the methane is separated from the raw material gas. The coarse oxygen removal according to the technical proposal of the invention can reduce the pretreatment cost of the raw material gas under the premise of more accurately ensuring no explosion.

Description

technical field [0001] The invention relates to a method for 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 component of coalbed methane is methane, which 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 transportation, or directly liquefied ...

Claims

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Application Information

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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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