Mixed Refrigerant Liquefaction System and Method

摘要

A system for liquefying a gas includes a liquefaction heat exchanger having a feed gas inlet adapted to receive a feed gas and a liquefied gas outlet through which the liquefied gas exits after the gas is liquefied in the liquefying passage of the heat exchanger by heat exchange with a primary refrigeration passage. A mixed refrigerant compressor system is configured to provide refrigerant to the primary refrigeration passage. An expander separator is in communication with the liquefied gas outlet of the liquefaction heat exchanger, and a cold gas line is in fluid communication with the expander separator. A cold recovery heat exchanger receives cold vapor from the cold gas line and liquid refrigerant from the mixed refrigerant compressor system so that the refrigerant is cooled using the cold vapor.

主权项

1. A system for liquefying a gas comprising:
a. a liquefaction heat exchanger having a warm end including a feed gas inlet and a cold end including a liquefied gas outlet with a liquefying passage positioned therebetween, where the feed gas inlet is adapted to receive a feed gas, said liquefaction heat exchanger also including a primary refrigeration passage; b. a mixed refrigerant compressor system configured to provide refrigerant to the primary refrigeration passage; c. an expander separator in communication with the liquefied gas outlet of the liquefaction heat exchanger; d. a cold gas line in fluid communication with the expander separator; e. a cold recovery heat exchanger having a vapor passage in communication with the cold gas line and a liquid passage, where the vapor passage is configured to receive cold vapor from the cold gas line; and f. said mixed refrigerant compressor system including a liquid refrigerant outlet in fluid communication with the liquid passage of the cold recovery heat exchanger, said cold recovery heat exchanger configured to receive refrigerant in the liquid passage and cool refrigerant in the liquid passage using cold vapor in the vapor passage.