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发明公开
CN110762391A 一种液化天然气工厂内液化天然气产品的降温降压系统及方法 审中-实审

一种液化天然气工厂内液化天然气产品的降温降压系统及方法
摘要：
本发明提供一种液化天然气工厂内液化天然气产品的降温降压系统及方法，该系统包括为常温天然气和制冷剂提供冷量的制冷机组、预冷换热器、冷箱、液化天然气储罐及BOG压缩机。采用低温BOG压缩机来降低LNG储罐内BOG气相空间压力，实现LNG储罐内高温液体通过蒸发降温的工艺；通过在浅冷温度区间(不低于-25℃)为系统提供的冷量，配合混合制冷剂配比调整，实现LNG产品深冷温度区间(低于-120℃)降温的工艺。通过LNG产品温度的降低，可减少LNG产品在运输及储存过程中产生的BOG气体，提高天然气利用率，减少温室气体CH4的排放。
摘要（英）：

The invention provides a temperature and pressure decreasing system and method for liquefied natural gas (LNG) products in LNG plants. The temperature and pressure decreasing system comprises a refrigerating unit providing the cool capacity for normal-temperature natural gas and a refrigerant, a pre-cooled heat exchanger, a cold box, a LNG storage tank and a BOG compressor. The low-temperature BOGcompressor is adopted to decrease the BOG gas phase space pressure in the LNG storage tank, and the technology of decreasing the temperature of high-temperature liquid in the LNG storage tank throughevaporation is achieved; through the cool capacity provided for the system in the shadow-cooling temperature interval (not less than minus 25 DEG C) and through cooperation with proportion adjustmentof the mixed refrigerant, the technology of decreasing the temperature of the LNG products in the deep-cooling temperature interval (less than minus 120 DEG C) is achieved; and by decreasing the temperature of the LNG products, BOG generated in the transportation and storage processes of the LNG products can be reduced, the natural gas utilization ratio is increased, and emission of greenhouse gas CH4 is reduced.

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