Application of 8-tower VPSA process in low-concentration coalbed methane CH₄ concentration and enrichment

In order to improve the utilization rate of low-concentration coalbed methane, promote coal mine safety production and gas control, based on the working principle of vacuum pressure swing adsorption (VPSA) process, a control process of methane concentration and enrichment for low concentration coalbed methane with 8 towers, 1 suction and 5 pressure equalization (8-1-5) is proposed. Siemens S7-300 PLC is selected as the lower computer controller, Zijinqiao V6.5 is used as the system control configuration, and each adsorption tower works alternately with 24 steps as a cycle. The results show that the 8-tower process can increase the CH₄ content in low-concentration coalbed methane from 28% to 51.53%, and the CH₄ recovery rate reaches 96.4%.