Abstract: The operating system of a gas engine accommodating to sour gas comprises a sour gas compressing and feeding part including a compressor 11 and a gas engine 12, a pre-membrane-treatment 13 for obtaining a compressed gas of proper temperature 13a removed of oil, solid mixture, etc. from the high pressure, high temperature sour gas 11a discharged from the compressor, a preceding step filter 18 for removing a minute amount of oil and water contained in the branched off gas 13b of the compressed gas of proper temperature 13a, a membrane separator for separating the gas from the filter 18 into sweet gas 21 and the hydrogen sulfide gas, and an adsorptive separator 20 through which sweet gas is obtained only at the time of starting of the compressor 11.

Abstract: The present invention provides an operating method of a gas engine accommodating to sour gas containing hydrogen sulfide and the system thereof, which enables the continuous and automatic operation of the system without causing environmental pollution by creating a high grade sweet gas through removing hydrogen and water from the sour gas to be supplied to a gas engine to drive a compressor for pressure feeding natural gas.