GAS SEPARATION SYSTEM AND ENRICHED GAS PRODUCTION METHOD

摘要

A gas separation system includes: first, second, and third gas separation membrane units. A first retentate gas line connects a retentate gas discharge port of the first unit and gas inlet port of the second unit. A first permeate gas line connects a permeate gas discharge port of the first unit and gas inlet port of the third unit. A feed gas mixture supply line is connected to a gas inlet port of the first unit, and provided with first compression elements. The first permeate gas line is provided with second compression elements. The permeate gas discharge port of the second unit is connected by a second permeate gas line to the suction side of the first compression elements in the feed gas mixture supply line. A retentate gas discharge port of the third unit is connected by a third retentate gas line to the first retentate gas line.

主权项

1. A gas separation system comprising a gas separation membrane unit to which a feed gas mixture containing at least two different gas species is supplied and in which at least one of the gas species contained in the feed gas mixture is enriched, wherein
the gas separation membrane unit comprises a first gas separation membrane unit, a second gas separation membrane unit, and a third gas separation membrane unit, each gas separation membrane unit has at least a gas inlet port, a permeate gas discharge port, and a retentate gas discharge port, the retentate gas discharge port of the first gas separation membrane unit and the gas inlet port of the second gas separation membrane unit are connected by a first retentate gas line, the permeate gas discharge port of the first gas separation membrane unit and the gas inlet port of the third gas separation membrane unit are connected by a first permeate gas line, the gas inlet port of the first gas separation membrane unit is connected to a feed gas mixture supply line, the feed gas mixture supply line being provided with a first compression means in the middle thereof, the first permeate gas line is provided with a second compression means in the middle thereof, the permeate gas discharge port of the second gas separation membrane unit is connected by a second permeate gas line to the suction side of the first compression means in the feed gas mixture supply line, the retentate gas discharge port of the third gas separation membrane unit is connected by a third retentate gas line to the first retentate gas line of the first gas separation membrane unit, and the enriched gas is recovered from at least one of the retentate gas discharge port of the second gas separation membrane unit and the permeate gas discharge port of the third gas separation membrane unit.