| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system of controlling LG production and LG temperature.SOLUTION: A gas liquefaction process, especially for producing LNG, maintains the product flow rate and the temperature by controlling the refrigeration such that variation to reduce any difference between actual and required product temperatures is initiated before variation of the product flow rate to reduce any difference between actual and required flow rates. In preferred embodiments, the flow rate of one of a first refrigerant, which is used for liquefying natural gas, and a second refrigerant, which is used for subcooling the liquefied natural gas, is controlled with a difference between actual and required flow rates of the liquefied product; and the flow rates of the other refrigerant and the product are controlled with respective differences between actual and required process temperatures. |
