| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for controlling the operation of a BOG multistage displacement compressor, capable of preventing a temperature of low pressure stage-side discharge gas from exceeding a temperature allowable for the operation, even when the temperature of low pressure stage-side suction gas is higher than that in a steady operation. <P>SOLUTION: The method is provided for controlling the operation of a BOG multistage compressor 8 including plural stages of displacement compression sections 9, 10, which are connected with each other, for compressing boil-off gas (BOG) generated from liquefied natural gas 1. The method includes, in case of a predetermined condition, making a ratio of a load on the low pressure stage compression section 9 to a load on the high pressure stage compression section 10 of the BOG multistage compressor 8 (load ratio) smaller than load ratios in case of conditions other than the predetermined condition. In other words, suction temperature of the low pressure stage compression section 9 of the BOG multistage displacement compressor 8 is made detectable, and the predetermined condition is a condition where a detected temperature of the suction temperature is not lower than a first preset temperature. <P>COPYRIGHT: (C)2012,JPO&INPIT |
