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Invention Grant
CN107339853B 天然气液化系统和方法 有权 转让

天然气液化系统和方法
Abstract:
通过使用由原料气体的膨胀使膨胀机产生的动力，增大压缩机的出口压力，并降低对于冷却器的冷却容量的要求。天然气液化系统(1)包括：第一膨胀机(3)，其用于通过使用压力状态下的天然气作为原料气体来产生动力；第一冷却单元(11，12)，其用于冷却在所述第一膨胀机中通过膨胀减压的所述原料气体；蒸馏单元(15)，其用于通过蒸馏由所述第一冷却单元冷却的所述原料气体来减少或除去所述原料气体中的重质组分；第一压缩机(4)，其用于通过使用在所述第一膨胀机中所产生的动力来压缩通过所述蒸馏单元从其中减少或除去所述重质组分的所述原料气体；以及液化单元(21)，其用于通过与制冷剂进行热交换来液化由所述第一压缩机压缩的所述原料气体。
Abstract(English):

By using the power generated by an expander by an expansion of material gas, the outlet pressure of a compressor is increased, and a requirement on the cooling capacity of a cooler is reduced. The liquefaction system (1) for natural gas comprises a first expander (3) for generating power by using natural gas under pressure as material gas; a first cooling unit (11, 12) for cooling the material gas depressurized by expansion in the first expander; a distillation unit (15) for reducing or eliminating a heavy component in the material gas by distilling the material gas cooled by the first cooling unit; a first compressor (4) for compressing the material gas from which the heavy component was reduced or eliminated by the distillation unit by using power generated in the first expander; and a liquefaction unit (21) for liquefying the material gas compressed by the first compressor by exchanging heat with a refrigerant.

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