Condensation mixing device, condensation mixing method, the evaporation gas re-liquefaction unit and evaporation gas re-liquefaction process

摘要

PROBLEM TO BE SOLVED: To provide a condensing and mixing device and a condensing and mixing method for effectively condensing boil-off gas and mixing it with low temperature liquid, and to provided a boil-off gas reliquefying apparatus and a boil-off gas reliquefaction method capable of effectively achieving reliquefaction of boil-off gas.;SOLUTION: A condensing and mixing device 2 includes: memory means 18 prestoring correspondence relationship between pressure of mixed liquid and saturation temperature at that pressure as a first correspondence relationship A and prestoring correspondence relationship between the allowable minimum value of super-cooling degree of the mixed liquid and a sub-flow flow rate ratio attained by dividing a flow rate of the sub-flow with a sum of flow rate of main flow and flow rate of sub-flow as a second correspondence relationship B; and control means 17 for controlling a flow rate of the prescribed sub-flow by adjusting a degree of opening of a sub-flow adjustment valve 14 so as to cause the super-cooling degree of the mixed liquid to become larger than the prescribed minimum value on the basis of measured values of each of flow rate of the prescribed sub-flow, temperature and pressure of the prescribed mixed liquid while referring to the prescribed first correspondence relationship A and the prescribed second correspondence relationship B.;COPYRIGHT: (C)2015,JPO&INPIT