Oxygen-containing low-concentration combustible gas deoxidation method and deoxidation system

Abstract

The invention relates to a deoxygenation method and deoxygenation system for low concentration oxygen-containing combustible gas. The deoxygenation method includes: passing oxygen-containing low-concentration combustible gas into the deoxygenation bed, the oxygen in the oxygen-containing low-concentration combustible gas chemically reacts with the solid deoxidizer in the deoxygenation bed to generate oxygen-containing products, and the oxygen-containing products and the formed deoxygenated combustible gas They enter the gas-solid separation device together in the form of a gas-solid mixture for separation; the oxygen-containing products separated from the gas-solid separation device enter the regeneration bed, and the oxygen-containing products react chemically again at high temperature to generate oxygen and regenerated solid deoxidizer, and the regeneration bed The oxygen generated in the regeneration bed is discharged from the regeneration bed, and the solid deoxidizer generated in the regeneration bed is sent back to the deoxygenation bed. The deoxygenation system includes a deoxygenation bed, a gas-solid separation device, a regeneration bed, a gas-solids pipeline, an oxygenated product pipeline and a deoxidizer pipeline. The above method and system can safely and efficiently remove oxygen from oxygen-containing low-concentration combustible gas.

Description

technical field [0001] The invention relates to a deoxidation method and a deoxidation system for a combustible gas containing oxygen and low concentration. Background technique [0002] Coalbed methane refers to the hydrocarbon gas stored in coal seams with methane as the main component. It is an associated mineral resource of coal and belongs to unconventional natural gas, commonly known as gas. and underground extraction of coalbed methane, in which surface extraction of coalbed methane usually has a methane content of more than 90%, which can be used directly, while underground extraction of coalbed methane is generally mixed with a large amount of air during the extraction process, and the methane concentration is generally low. Low, generally less than 30%. According to safety requirements, when the concentration of methane is lower than 30%, it cannot be stored and transported. At the same time, when the volume concentration of methane in the air reaches 5% to 16%, t...

AI Technical Summary

Problems solved by technology

According to safety requirements, when the concentration of methane is lower than 30%, it cannot be stored and transported. At the same time, when the volume concentration of methane in the air reaches 5% to 16%, there is a danger of explosion.

Due to the existence of oxygen, low-concentration coalbed methane has great safety hazards in the subsequent utilization, purification and separation process. At present, the utilization rate of this part of coalbed methane is low, only about 10%. Therefore, the development of deep deoxidation technology of coalbed methane is a solution Key Issues of Safe and Efficient Utilization of Coalbed Methane

[0003] Oxygen-containing low-concentration combustible gases such as the above-mentioned coalbed methane (that is, the gas contains oxygen and the volume concentration of the combustible part is low), also have low utilization rates due to safety issues.

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