A system and method for extracting gas pressure swing adsorption enrichment and production increase for underground coal mines

Abstract

The invention discloses a system and method for extracting gas pressure swing adsorption enrichment and increasing production in underground coal mines. A pre-vacuumized methane adsorption tank and a dehydration device filled with adsorbents are connected with underground gas extraction branch pipes in coal mines. Under the action, the low-concentration gas enters the dehydration device and the methane adsorption tank in the negative pressure state after passing through the dust removal device and the gas-water separator. The space-free nitrogen and oxygen are extracted, and then the methane adsorption tank and dehydration device are vacuumed by the high negative pressure extraction system in the coal mine, so that the methane adsorbed on the adsorbent is desorbed to obtain high-concentration gas, and the water-absorbing agent and methane are adsorbed at the same time agent regeneration. The invention utilizes the existing high negative pressure and low negative pressure extraction systems in coal mines, and can greatly increase the gas concentration of the high negative pressure extraction system without additional power equipment, and is flexible in installation and widely applicable.

Description

technical field [0001] The invention relates to the technical field of coal mine gas extraction and enrichment, in particular to a system and method for extracting gas in underground coal mines by pressure swing adsorption, enriching, enriching, and increasing production. Background technique [0002] Coal mine gas, also known as coalbed methane, is an important unconventional natural gas resource. my country's coal mine gas reserves are very rich, and the geological resources below 2000m have reached 36.8 trillion m 3 . However, due to the complex occurrence conditions of coal mine gas in my country, poor coal seam permeability and poor ground drainage effect, currently about 70% of coal mine gas comes from underground gas drainage. Affected by mining activities, there are a large number of air leakage fissures in underground coal seams. Under the action of negative pressure drainage, a large amount of air enters the drainage boreholes along the fissures, resulting in a ge...

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Problems solved by technology

For example, "a method for separating and purifying methane in coalbed methane in mine area by pressure swing adsorption method" disclosed in Chinese invention patent application CN103205297A, "enrichment of methane in coal mine gas by pressure swing adsorption method" disclosed in Chinese invention patent application CN85103557, China Invention patent application CN101596391A discloses "a low-concentration gas pressure swing adsorption graded concentration method" is to establish a large-scale centralized pressure swing adsorption system on the ground, and configure an additional booster pump or vacuum pump to provide pressure swing adsorption power. Huge amount, high energy consumption, and poor fault tolerance. Failure of a certain part of the system will cause the entire system to shut down, and gathering a large amount of low-concentration gas in a small area for processing has a high potential safety hazard

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