Oxygen-removal method of oxygen-containing coal-bed gas

A coalbed methane and oxygen technology, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of difficulty in the source of hydrogen, the utilization rate of less than 10%, and the limitation of practical application.

Inactive Publication Date: 2013-06-19
DALIAN TIANYUAN GAS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's coal-bed methane emitted into the atmosphere due to coal mining is equivalent to 20 billion Nm of pure methane every year. 3 above, but the current utilization rate is less than 10%, resulting in a great waste of resources
[0014] The common disadvantages of the above methods are: the reaction temperature required for the complete reaction of oxygen and methane is relatively high, and the operating temperature of the deoxidation process is generally controlled at 400-700°C; the deoxidation process is at the cost of part of the loss of methane and is accompanied by side reactions of varying degrees
[0019] Its disadvantages are: the deoxidation process needs to use all precious metal catalysts, which is expensive; using hydrogen as a reducing gas, the source of hydrogen is relatively difficult for coal mining areas, which limits the practical application of this method in coalbed methane deoxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Oxygen-containing coalbed methane

[0044] CBM gas volume: 10000m 3 / h Temperature: 25°C Pressure: 1 atmosphere

[0045] The main composition of coalbed methane: CH 4 40%, O 2 10%, N 2 40%, the rest is a small amount of carbon dioxide, etc.

[0046] Total oxygen content in coalbed methane: 1000m 3 / h

[0047] Required reducing gases CO and H 2 Total: 2000m 3 / h

[0048] (2) Use semi-water gas

[0049] Reducing gas composition: H 2 36% to 37%, CO 32% to 35%, and the rest are nitrogen and carbon dioxide.

[0050] Reducing gas content: ≥60%

[0051] The required semi-water gas volume: about 3400m 3 / h

[0052] (3) Catalyst

[0053] Precious metal catalyst use space velocity: 13400h -1

[0054] Non-precious metal catalyst use space velocity: 1340h -1

[0055] The total amount of precious catalyst loaded: 1m 3

[0056] Total non-precious catalyst loading: 10m 3

[0057] Catalytic reactor stage setting: 5 stages

[0058] Catalytic reactor aspect ra...

Embodiment 2

[0063] (1) Oxygen-containing coalbed methane

[0064] CBM gas volume: 1000m 3 / h Temperature: 25°C Pressure: 1 atmosphere

[0065] The main composition of coalbed methane: CH 4 30%, O 2 5%, N 2 50%, the rest is carbon dioxide and a small amount of hydrocarbons.

[0066] Total oxygen content in coalbed methane: 50m 3 / h

[0067] Required reducing gases CO and H 2 Total: 100m 3 / h

[0068] (2) Using producer gas

[0069] Reducing gas composition: H 2 13%~15%, CO25%~30%, the rest is nitrogen and a small amount of methane and carbon dioxide.

[0070] Reducing gas content: about 40%

[0071] Producer gas volume required: about 250m 3 / h

[0072] (3) Catalyst

[0073] Noble metal catalyst use space velocity: 12500h -1

[0074] Total amount of precious metal catalyst loading: 0.1m 3

[0075] Catalytic reactor stage setting: 1 stage

[0076] Catalytic reactor aspect ratio: 3

[0077] Reactor catalyst loading: 0.1m in the reactor 3 AO-type noble metal catalyst (ma...

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Abstract

The invention provides an oxygen-removal method of oxygen-containing coal-bed gas. The oxygen-removal method is characterized in that oxygen-containing coal-bed gas and manufactured gas are fed into a reactor with a catalyst; and carbon monoxide and hydrogen in the manufactured gas react with oxygen in the oxygen-containing coal-bed gas in the presence of the catalyst to produce carbon dioxide and water so that oxygen removal is realized.

Description

technical field [0001] The invention belongs to the field of development and application of coal bed gas in coal mining areas, and in particular relates to a deoxidation method for oxygen-containing coal bed gas. Background technique [0002] Coalbed methane is associated gas adsorbed in coal seams, and its main component is methane, which belongs to unconventional natural gas. The world's coalbed methane reserves are huge. According to the statistics of the International Energy Agency (IEA), the global coalbed methane resources can reach 270 trillion Nm 3 , 90% of which are distributed in 12 major coal-producing countries, among which the coalbed methane resources in Russia, Canada, China, the United States and Australia all exceed 10 trillion Nm 3 . China is rich in coalbed methane resources and is the third largest country in coalbed methane reserves. According to the evaluation results of coalbed methane resources in 2005, the total resources of coalbed methane buried...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 曲明远李富岭丛卫军
Owner DALIAN TIANYUAN GAS TECH
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