A liquid ring compressor used in refineries for flare gas recovery. Use compressors of 1200 m3/h and 600 m3/h. The suction pressure should be 1 bar abs, and the discharge pressure should be 8 bar abs.
(1) Process Plan 1: Introduce vent air from the flare main to the inlet of the recovery compressor, pressurize it, and then enter the separator at the inlet of the light hydrocarbon unit; Or it can directly enter the dry gas export pipeline, control the pressure of the flare header with water seal, and prevent backfire with flame arrester to achieve the purpose of recycling the flare vent air.
(2) Scheme II: make full use of the existing process equipment, properly adjust the suction process of the original stabilized compressor, lead the flare gas from the flare header to the inlet of the original stabilized compressor, use the surplus recovery capacity of the original stabilized compressor to recover the flare vent air, add pneumatic butterfly valves to the flare header pipeline to control the pressure of the flare header, parallel the rupture disc bypass process and manual gate valve circuit, and use flame arrester to prevent backfire.
Under normal operating conditions, using the above two schemes can achieve the recovery and utilization of torch gas, achieving the goal of eliminating the torch. In the event of an accident during venting or exceeding the maximum recovery capacity of the compressor, the gas breaks through the water seal or the pneumatic control valve opens, causing discharge and combustion.
Research results: The liquid ring compressor in refineries is suitable for the recovery application of flare gas in joint stations or natural gas treatment plants. It can not only utilize existing facilities, reduce land occupation, operating costs, and investment, but also undergo local renovation to improve processing capacity. It is also suitable for the recycling and utilization of natural gas from remote single wells. This achievement has been applied in torches at multiple joint stations. It has reference significance for the recovery of flare gas from other oil fields.
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