Two processes for boil-off gas (BOG) re-liquefaction of liquefied natural gas (LNG) carrier with normal-temperature compressor are proposed and compared: (1) the re-liquefaction system with the single mixed refrigerant process (SMRP), (2) the re-liquefaction system with the dual mixed refrigerant process (DMRP). The main thermodynamic parameters to be compared are specific energy consumption, exergy efficiency, coefficient of performance, heat transfer curves and exergy losses of main equipment in optimized case and base case. The result shows that the performance of the DMRP is better than that of the SMRP and the specific energy consumption of DMRP is 0.5635 kWh/kg_LNG. In addition, by comparing the thermodynamic parameters of the re-liquefaction system with the normal-temperature compressor and the cryogenic compressor, it can be found that not only the cooling capacity of BOG is used effectively, but also the energy consumption is reduced and the efficiency is improved for the normal-temperature compressor system. Therefore, for the two mixed refrigerant re-liquefaction systems, the performance of the normal-temperature compression system is better than that of the low-temperature compression system.

提出并比较了常温压缩机对液化天然气（LNG）载体的蒸发气（BOG）进行再液化的两种方法：（1）采用单一混合制冷剂工艺（SMRP）的再液化系统，（ 2）具有双重混合制冷剂工艺（DMRP）的再液化系统。在最佳情况和基本情况下，要比较的主要热力学参数是比能耗，火用效率，性能系数，传热曲线和主要设备的火用损耗。结果表明，DMRP的性能优于SMRP，DMRP的单位能耗为0.5635 kWh / kg_{液化天然气。}。此外，通过将再液化系统与常温压缩机和低温压缩机的热力学参数进行比较，可以发现不仅有效利用了BOG的冷却能力，而且降低了能耗，并且降低了能耗。常温压缩机系统的效率得到提高。因此，对于两个混合制冷剂再液化系统，常温压缩系统的性能优于低温压缩系统。