公开(公告)号：EP1281033A1

公开(公告)日：2003-02-05

申请号：EP01927923.1

申请日：2001-04-24

申请人： SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V.

发明人： ELION, Wiveka, Jacoba ,  JONES, Keith, Anthony ,  MCLACHLAN, Gregory, John ,  WILSON, Jonathan, Hamilton

IPC分类号： F25J1/02

CPC分类号： F25J1/0244 ,  F25J1/0022 ,  F25J1/0055 ,  F25J1/0212 ,  F25J1/0258 ,  F25J1/0272

摘要： Controlling the production of a liquefied natural gas (31) comprises measuring the temperature (50) and the flow rate (55) of the liquefied natural gas (31); maintaining the flow rate of the heavy mixed refrigerant (60a) at an operator manipulated set point (80), and determining the flow rate of the light mixed refrigerant (86) from (i) the flow rate of the heavy mixed refrigerant (80) and (ii) an operator manipulated set point for the ratio of the flow rate of the heavy mixed refrigerant to the flow rate of the light mixed refrigerant (81); determining a dependent set point (91) for the ratio of the flow rate of the liquefied natural gas to the flow rate of the heavy mixed refrigerant such that the temperature (50) of the liquefied natural gas is maintained at an operator manipulated set point (90); determining a dependent set point (95) for the flow rate of the liquefied natural gas (95) from (i) the dependent set point (91) for the ratio of the flow rate of the liquefied natural gas product stream to the flow rate of the heavy mixed refrigerant and (ii) the flow rate of the heavy mixed refrigerant (60c); and maintaining the flow rate of the liquefied natural gas (55a) at its dependent set point (95).