Operating method of gas engine accommodating to sour gas and the system thereof

An operating method of a gas engine accommodating to sour gas in the operation of the gas engine for driving a compressor to pressure feed sour gas in a gas field, wherein:

• hydrogen sulfide separated through a membrane separator is introduced together with low pressure sour gas from a gas field to obtain a high pressure sour gas,
• said high pressure sour gas is removed of liquid mist, water, and oil and obtains a compressed gas adjusted by a proper temperature for membrane treatment by way of a pre-membrane-treator,
• a part of said compressed gas of proper temperature is returned to said membrane separator, and
• the remaining large part of the compressed gas of proper temperature is sent to an external plant as sour gas, and
• wherein said pre-membrane-treator is composed such that said compressed gas of proper temperature removed of liquid mist, oil, and water is obtained by removing the oil mixed in said high pressure sour gas through a primary (and a secondary as needed) oil separator, adjusting to a proper temperature for membrane separation by an after-cooler, and removing water by a drain separator.

An operating system of a gas engine accommodating to sour gas in the operation of the gas engine for driving a compressor to pressure feed sour gas in a gas field, the system comprising,

• a high pressure sour gas producing part for compressing and feeding sour gas by the compressor driven by a the gas engine,
• a pre-membrane-treator for obtaining a compressed gas which is adjusted to a proper temperature for membrane separation, and is removed of liquid mist, water, and oil from the high pressure gas,
• a membrane separator for obtaining a sweet gas to be supplied to said gas engine by separating hydrogen sulfide from a part of said compressed gas, the separated hydrogen sulfide being returned to said compressor,
• an adsorptive separating means separator for supplying a sweet gas created by removing hydrogen sulfide and water from sour gas when starting the operation of the system, and
• a passage for sending the a large part of said compressed gas to an external plant.