Recovery and process of stations vent gas in West-to-East Gas Pipeline

Gas venting in compressor station and offtake station in the long-distance gas pipeline mainly includes emergency venting and plannedventing. The former has randomness with big volume gas venting in a turn, usually free of technical condition to recover, and the lattermainly refers to separator blow-off venting and periodic maintenance venting of compressors, with confirmed plans or periodicity andrecovery economy. Statistics shows that the gas venting from compressor maintenance and separator blow-off accounts for more than 50% of the total venting volume in stations of West-to-East Gas Pipeline. Therefore, it is feasible and necessary to recover vented natural gas. To this end, a station vent natural gas recovery processing system with the core of CNG compressors is designed, which can recover the vented natural gas produced from equipment maintenance and blow-off in the station and re-inject it into the upstream pipeline, downstream pipeline or offtake pipeline to achieve the goal of energy saving and emission reduction.