Natural gas liquefaction system and method suitable for standard modularization

• Main Authors: LUO TINGTING, CHENG HAO, LIU MIAO'ER, FAN MINGLONG, ZENG WEIPING, ZHANG XIAOHUI, YIN QUANSEN, ZHANG CHAO, SU QINGBO, HUA YIHUAI
• Format: Patent
• Language: Chinese; English
• Published: 22.11.2022
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; MIXTURES BY PRESSURE AND COLD TREATMENT; REFRIGERATION OR COOLING; WEAPONS

The invention discloses a natural gas liquefaction system and method suitable for standard modularization. The natural gas liquefaction system comprises a natural gas precooling, liquefaction and supercooling system, a heavy hydrocarbon separation system, a mixed refrigerant compression refrigeration cycle system, an LNG tail end flash evaporation system and a BOG cold energy utilization system. The natural gas pre-cooling, liquefying and supercooling system comprises a pre-cooling cold box heat exchanger and a liquefying cold box heat exchanger; the heavy hydrocarbon separation system comprises a heavy hydrocarbon removal recontact tower and a rectifying tower; the LNG tail end flash evaporation system comprises an LNG hydraulic turbine and an LNG recontact tower; the BOG cold energy utilization system comprises a BOG recuperator. The device disclosed by the invention is small in production scale, and the equipment and the process technology can be completely localized; the pre-cooling cold box adopts a plat