Natural gas liquefaction propylene refrigerating system

The utility model relates to a gas treatment technical field discloses a natural gas liquefaction propylene refrigerating system, including propylene compressor, propylene water condenser and the propylene lime set collection tank that connects gradually, connect the first propylene evaporation absorptive unit between propylene lime set collection tank and propylene compressor's level four entry, connect the second propylene evaporation absorptive unit between first propylene evaporation absorptive unit and propylene compressor's tertiary entry, connect the third propylene evaporation absorptive unit between second propylene evaporation absorptive unit and propylene compressor's second grade entry to and the fourth propylene of connecting between third propylene evaporation absorptive unit and propylene compressor's one -level entry evaporates the absorptive unit. The utility model discloses at the when used mainly be that the propylene evaporation absorptive unit of level four cools off and gas -liquid separation to reclaim the propylene of after -separating again and carry out cyclic utilization in propylene compressor, whole device has simple structure, operation steady advantage.