Patent ID: 11874056
Assignee: JGC CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC F  G | IPC F  G

Claim 6:
7. An operation guidance searching system for a liquefied natural gas plant, comprising:
a data acquisition unit configured to acquire a plurality of data sets including operation data and disturbance data from the liquefied natural gas plant, the liquefied natural gas plant including a liquefying heat exchanger configured to liquefy a natural gas with use of a liquefying refrigerant to obtain a liquefied natural gas, and a compressor configured to compress a refrigerant gas obtained after refrigerants including the liquefying refrigerant are vaporized, the operation data indicating actual values of process variables at least including a compression power of the compressor, and including controlled variables and manipulated variables for a plurality of target devices forming the liquefied natural gas plant, the disturbance data indicating actual values of disturbances affecting the process variables;
a plant model generating unit configured to generate, through machine learning using a computer, based on the plurality of data sets acquired by the data acquisition unit, a plant model indicating correspondences of output values of process variables other than the manipulated variables with respect to the manipulated variables and input values of the disturbances; and
an operation guidance searching unit configured to give the input values of the disturbances and initial values of the manipulated variables to the plant model generated by the plant model generating unit, and search, through reinforcement learning using the computer, for input values of the manipulated variables with which the compression power per unit production amount of the liquefied natural gas is minimized under a condition in which an outlet temperature of the liquefied natural gas is a preset restriction temperature or lower.