The massive emission of low-concentration coal mine methane (CMM) has resulted in the ineffective utilization of a large amount of energy methane and caused environmental pollution.The gas mixture used in the study consisted of methane (CH4) 12% and nitrogen (N2) 88%.The adsorbent was coconut activated carbon.
This paper uses the adsorption method to conduct enrichment research on 12% low-concentration CMM.Firstly, the variation in methane gas concentration under different desorption methods was studied by numerical simulation, and the desorption methods suitable for increasing methane concentration were analyzed.A three-bed VPSA CMM separation experimental device was built, and three enrichment processes of VITAMIN E PURE SKIN OIL feed gas pressurization, exhaust gas pressurization, and vacuum exhaust (VE) were studied.
The results show that using the three-bed vacuum macbook pressure swing adsorption (VPSA) process can effectively enrich low-concentration CMM.Under the adsorption pressure of 110 kPa and the desorption pressure of 10 kPa, 12% of CMM can be enriched to more than 25%, with a recovery rate higher than 80%.The exhaust process can significantly increase the product gas concentration.
The product gas concentration increased by 18.2%, with the product rising from 22.5% to 26.
6% when the extraction step increased from 0 s to 8 s.This research may provide reliable fundamental data for industrial-scale low-concentration CMM enrichment.