Abstract
A new helium liquefier system has been designed and built to provide over 100 liters per hour with a highly efficient process cycle. The modified Claude-cycle utilizes four reciprocating piston expansion engines configured in series, with the lowest temperature engine acting as a wet expander (replacing the usual JT valve). Operation of the system is highly flexible, permitting the use of one or more oil-flooded rotary screw compressors, and the freedom of choice to use liquid nitrogen precooling, or not. A new purifier was designed for maximum efficiency, which accepts feed gas with up to 20% air contamination. When operating on pure feed gas, the system will produce up to 150 1/hr of liquid helium. Input power is on the order of 210 kW. The system is designed for fully automatic operation with remote data monitoring and printer/plotting capability. The paper will describe details of the process design, mechanical features, and performance test results.
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