Stage refrigerating cycle liquefaction process
A refrigeration cycle and cascaded technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of LNG technology starting late, and achieve the effects of reduced risk, reduced surge, and mature technology
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[0028] The present invention includes propane cycle process, ethylene cycle process, and methane cycle process.
[0029] Described propane cycle process comprises the following steps;
[0030] (a) The low-pressure propane vapor is compressed by a propane compressor and conventionally cooled by cooling water to achieve full condensation;
[0031] (b) The liquid propane refrigerant is throttled and expanded step by step under different pressures, so that the propane evaporates at different temperatures, so that the propane refrigerant cools the natural gas and the circulating refrigerant step by step in different temperature ranges ;
[0032] (c) The propane vapors at different pressures are returned to the corresponding inlets of the cycle compressor, completing a closed refrigeration cycle for propane.
[0033] The ethylene recycling process comprises the following steps;
[0034] (d) The low-pressure ethylene vapor is compressed by an ethylene compressor, and is convention...
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