Abstract
Helium purification system is vital for removing gaseous and oil aerosol/oil vapour impurities in helium which can freeze and damage ultra high-speed turbo-expanders and choke fine passages of cryogenic heat exchangers or fine filters of helium refrigerators/liquefiers. An external helium purifier is designed and fabricated for purification of 10 Nm3/hr flow of impure helium with maximum N2 impurity of 1%. It consists of an evacuated super-insulated cold box, a helical coil heat exchanger with tube in tube type configuration, an LN2 bath and a charcoal adsorber maintained at LN2 temperatures. The main features of the purifier are its compactness, low LN2 consumption, ease and simplicity of charcoal regeneration. Performance evaluation of the purifier is carried out by observing the impurities (N2, moisture and hydrocarbons) in the purified helium gas at its exit. Total LN2 consumption and effectiveness of heat exchanger used for recovery of cold of outgoing helium are also evaluated.
Published Version
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