Design of a Cryogenic Expansion Engine for Tonnage Hydrogen Liquefaction
The reciprocating expansion engine as used in air separation and liquefaction has been in service for many years. The design and performance of the conventional and most common type, with a lubricated cylinder encased in a water warming jacket, is well known to the cryogenic industry. However, the more recent developments with un-lubricated cylinders designed to operate at inlet pressures from 1500–3000 psi and piston speeds from 500–700 fpm have not been discussed in much detail. Engines of this type have brought about reductions in plant cost and complexity, at the same time improving plant safety and efficiency. Furthermore, they have paved the way for the large cryogenic units, capable of operation at the extreme conditions required for the tonnage liquefaction of hydrogen and helium.
KeywordsCylinder Head Piston Ring Radiation Shield Heat Leak Piston Speed
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