Deoxidizing and decarbonizing purification process for gas utilization

The invention belongs to the technical field of gas utilization treatment, and particularly relates to a deoxidizing and decarbonizing purification process in a gas utilization process. The inventionprovides the deoxidizing and decarbonizing purification process in gas utilization. Gas is used as a raw material, compression and purification treatment is firstly carried out, then two-stage pressure swing adsorption treatment is carried out according to the concentration of CO2 in a gas source, and O2 and CO2 contained in the gas are respectively removed on the premise that the process is safe,so that the gas is purified and used for other utilization ways. In the process, an activated carbon adsorbent for conventional deoxidation is selected for deoxidation to improve the safety of the separation process; a KOH modified adsorbent is selected for decarburization, CO2 separation and CH4 concentration can be achieved at the same time, the separation efficiency is better, the process safety and reliability are gua