Coalbed methane separation and purification
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Coalbed methane mainly consists of 33% methane, 54% nitrogen, and 12% oxygen, with small amounts of carbon monoxide and carbon dioxide. From a safety perspective, oxygen must be separated first during the purification process. What methods can be used for oxygen removal? Is hydrodeoxidation feasible? What is a hydrogenation deoxygenation catalyst? Thank you
What is oxygen separated for? Isn’t it better to use it directly as boiler fuel?
Cryogenic treatment, PSA, and membrane separation should all work; it depends on what product gas you need.
I want to purify it for use as natural gas; do you have any good suggestions? Thank you
For purifying it into natural gas, the three commonly used gas purification and separation methods—deep cooling, PSA, and membrane separation—are all not feasible. Because all three methods require compressing coalbed methane to a certain pressure, at which point it is within its explosive range and extremely dangerous. This type of coalbed methane is best used as a chemical raw material or burned directly to generate electricity; that might be a good option!
How to remove oxygen is the key to utilizing this type of coalbed methane, and at present there are no very effective methods for this purpose. The most direct uses are for power generation or as pipeline gas. Membrane technology can only increase the methane concentration to a limited extent, and it is ineffective against oxygen; catalytic deoxygenation is only suitable for removing trace amounts of oxygen
6# lipanhg compression does not result in entry into the explosive range; however, during pressure swing adsorption, it is impossible to avoid the explosive range no matter what method is used. 33% is already higher than the 30% minimum concentration allowed by policy for coalbed methane use in power generation.
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May I ask which organization you work for? What method is used for the deoxygenation of coalbed methane? Is it done through laboratory experiments or industrial pilot tests?
Is it convenient to discuss the general technology on the 9th floor?