Expander sealing gas discharging equipment

The utility model relates to an expander sealing gas discharging equipment, including torch, gas circuit dispatch district, the one end in gas circuit dispatch district is connected with torch, suction port of compressor jar, fuel gas preparation system, the other end in gas circuit dispatch district is connected with high pressure expansion machine, high pressure expansion machine, low -pressureexpansion machine, all be equipped with the pneumatic valve between gas circuit dispatch district and each pipeline, the expander includes high pressure expansion machine A, high pressure expansion machine B, low -pressure expansion machine. Through at the driving initial stage, arrange expander sealing gas to the suction port of compressor jar, get back to the cold box again, hydrogen can reducehydrogen gas consumption volume at system's inner loop, and under the device normal operating condition, discharges expander sealing gas to fuel gas preparation system, can reduce the power of compressor, the design can reduce