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    • 44. 发明申请
    • PROCESS OF LIQUEFYING A GASEOUS, METHANE-RICH FEED TO OBTAIN LIQUEFIED NATURAL GAS
    • 液化天然气,甲烷进料获得液化天然气的方法
    • WO99031448A1
    • 1999-06-24
    • PCT/EP1998/008133
    • 1998-12-11
    • F25J1/00F25J1/02
    • F25J1/0292F25J1/0022F25J1/0052F25J1/0055F25J1/0216F25J1/0249F25J1/0252F25J1/0267F25J1/0283F25J1/0287F25J2205/04F25J2205/50F25J2220/62F25J2220/64F25J2245/02
    • Cooling, liquefying and sub-cooling in a main heat exchanger (1) a gaseous, methane-rich feed against evaporating refrigerant to get a liquefied stream, and passing (80) the liquefied stream to storage as liquefied product. The liquefaction process is controlled by using an advanded process controller based on model predictive control to determine simultaneously control actions for a set of manipulated variables in order to optimize at least one of a set of parameters whilst controlling at least one of a set of controlled variables, wherein the set of manipulated variables includes the mass flow rate of the heavy refrigerant fraction (52), the mass flow rate of the light refrigerant fraction (59) and the mass flow rate of the methane-rich feed (20), wherein the set of controlled variables includes the temperature difference at the warm end (3) of the main heat exchanger (1) and the temperature difference at the mid-point (7) of the main heat exchanger (1), and wherein the set of parameters to be optimized includes the production of liquefied product (80).
    • 在主热交换器(1)中冷却,液化和次冷却气态富含甲烷的进料,以蒸发制冷剂以获得液化流,并将液化流(80)作为液化产物(80)通入储存。 通过使用基于模型预测控制的优先过程控制器来控制液化过程,以同时确定一组操纵变量的控制动作,以优化一组参数中的至少一个,同时控制一组受控变量 ,其中所述一组操纵变量包括重制冷剂馏分(52)的质量流率,轻质制冷剂馏分(59)的质量流率和富甲烷进料(20)的质量流量,其中 一组控制变量包括主热交换器(1)的暖端(3)和主热交换器(1)的中点(7)的温差的温差,其中该组参数 要优化的包括生产液化产品(80)。