Cryogenic liquefying/refrigerating method and system

Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction

Reexamination Certificate

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C062S613000, C062S238300

Reexamination Certificate

active

07540171

ABSTRACT:
Cryogenic liquefying/refrigerating method and system, wherein temperature of gas-to-be-liquefied at the inlet of the compressor for compressing the gas is reduced by cooling the gas discharged from the compressor using a high-efficiency chemical refrigerating machine and vapor compression refrigerating machine before the gas is introduced to a multiple stage heat exchanger thereby reducing power input to the compressor and improving liquefying/refrigerating efficiency. Gas-to-be-liquefied compressed by a compressor is cooled by aftercooler, and further cooled by an adsorption refrigerating machine which utilizes waste heat generated in the compressor and by an ammonia refrigerating machine40, then the high pressure gas is introduced to a multiple-stage heat exchanger where it is cooled by low pressure low temperature gas separated from a mixture of liquid and gas generated by adiabatically expanding the high pressure gas through an expansion valve30and returning to the compressor, and a portion of the high pressure gas is expanded adiabatically by expansion turbines in mid-course of flowing of the high pressure gas through the stages of the heat exchanger to be joined with the low pressure low temperature gas returning to the compressor.

REFERENCES:
patent: 3389565 (1968-06-01), Ergenc
patent: 3611740 (1971-10-01), Giger
patent: 4697425 (1987-10-01), Jones
patent: 4819445 (1989-04-01), Scherer
patent: 6158241 (2000-12-01), Erickson
patent: 07-18611 (1955-03-01), None
patent: 60-44775 (1985-03-01), None
patent: 63-131960 (1988-06-01), None
patent: 10-238889 (1998-09-01), None
Relevant portion on International Search Report, dated Apr. 5, 2005, issued in corresponding PCT application PCT/JP05/03001, filed Feb. 24, 2005.

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