| 摘要 |
PROBLEM TO BE SOLVED: To enable prompt precooling of a liquefied gas supply pump for pressure-feeding low-temperature liquefied gas.SOLUTION: A liquefied gas supply device 10 includes a liquefied gas supply pipeline system 30, an atmospheric release pipeline system 40 and a circulation pipeline system 50 as passing pipeline systems of liquefied nitrogen gas. Prior to supply of the liquefied nitrogen gas under operation control of a liquefied gas supply pump 34 included in the liquefied gas supply pipeline system 30, first control and second control are executed in this order. In the first control, after an auxiliary pump 44 included in the atmospheric release pipeline system 40 is stopped, the pipeline system through which the liquefied nitrogen gas passes is switched to the atmospheric release pipeline system 40. In the second control, after the gas pipeline system is switched to the circulation pipeline system 50, the operation of the auxiliary pump 44 is controlled, so as to precool the liquefied gas supply pump 34 by using the liquefied nitrogen gas pressure-fed by the pump. |
