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|1. (WO2018105565) RAW MATERIAL GAS LIQUEFACTION DEVICE AND CONTROL METHOD FOR SAME|
|Applicants:||KAWASAKI JUKOGYO KABUSHIKI KAISHA
|Title:||RAW MATERIAL GAS LIQUEFACTION DEVICE AND CONTROL METHOD FOR SAME|
A raw material gas liquefaction device comprises: a feed line that supplies a raw material gas; a refrigerant circulation line that circulates refrigerant and that has a turbine expander to generate cold heat by expanding the refrigerant in order to cool the raw material gas and an expander inlet valve provided on the inlet side of the expander; a heat exchanger by which heat exchange is performed between the raw material gas and the refrigerant; a cooler that performs the initial cooling of the raw material gas and refrigerant by way of heat exchange with liquid nitrogen; and a control device that performs feedback control so that the rotational speed of the expander matches a prescribed target value by manipulating the expander inlet valve opening while starting and stopping the expander.