| 摘要 |
PURPOSE:To provide an air liquefying and separating device and its controlling method in which the most appropriate amount of cold heat calorie can be generated by an expansion turbine while a liquid surface in a main condensing evaporator is being kept at an approximate specified level. CONSTITUTION:An amount of liquefied oxygen within a main condensing evaporator 11 is detected by a liquid surface level meter 30, a set value in a flow rate controlling device 31 is varied in response to a result of detection and then a flow rate of liquefied oxygen to be extracted from a part of the main condensing evaporator is adjusted. Then, the set value in the flow rate controlling device 32 in an expansion turbine 26 is varied in response to a tendency of increasing or decreasing of an amount of liquefied oxygen and a flow rate of liquefied oxygen to be extracted, a flow rate of gas is controlled and the most appropriate amount of cold heat is attained.
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