GAS LIQUEFACTION SYSTEM AND METHODS

• Main Authors: KENNEDY DAVID ALLEN, ZHAO SHUKUI
• Format: Patent
• Language: Chinese; English
• Published: 31.07.2018
• 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

A liquefaction system is configured to use a single methane expander to provide primary refrigeration duty. The liquefaction system can include a heat exchanger and a fluid circuit coupled with the heat exchanger, the fluid circuit configured to circulate a process stream derived from an incoming feedstock of natural gas. The fluid circuit can comprise a methane expander coupled with the heat exchanger, a sub-cooling unit coupled with the methane expander, the sub-cooling unit configured to form a liquid natural gas (LNG) product from the process stream, and a first throttling device interposed between the heat exchanger and the sub-cooling unit. The methane expander and the first throttling device can be configured to expand the process stream to a process pressure that is between a firstpressure of the incoming feedstock and a second pressure of the process that exits the sub-cooling unit. 液化系统构造成使用单个甲烷膨胀器来提供主要制冷功能。液化系统可包括热交换器和与热交换器联接的流体回路，流体回路构造成使源自天然气的进入给料的过程流循环。流体回路可包括：与热交换器联接的甲烷膨胀器；与甲烷膨胀器联接的过冷单元，过冷单元构造成