What liquefaction process is mainly used in domestic natural gas liquefaction plants at present?
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What liquefaction process is mainly used in domestic natural gas liquefaction plants at present? Could you give a brief introduction to the process flow?
In China, Guanghui in Xinjiang has a methane cryogenic plant.
I have read some literature before on the use of propane pre-cooling combined with mixed refrigerants for cooling purposes, but this also depends on the specific circumstances; there are also cascade systems and expansion refrigeration methods that utilize expanders
It mainly consists of three components: a mixed refrigerant refrigeration cycle, a propane pre-cooling cycle, and a natural gas liquefaction circuit
The common processes currently used in China include nitrogen expansion, nitrogen-methane expansion, and mixed refrigeration (MRC). In the past couple of years, nitrogen expansion and nitrogen-methane expansion have been the most widely used methods, as they require low investment costs and enable relatively small amounts of liquefaction； The MRC process has been adopted in the past two years, and it is said that the technology isn’t particularly good!
France’s Linquefin process is highly advanced. It has advantages over both the shell and Linden processes.