F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/112, 167/322
F25D 13/06 (2006.01) F25D 3/11 (2006.01) F25D 29/00 (2006.01)
Patent
CA 1247386
ABSTRACT IMPROVEMENTS IN OR RELATING TO CRYOGENIC COOLING A process is provided for carrying out the cryogenic cooling of a material which comprises introducing material to be cooled into an elongated cryogenic tunnel housing on means for conveying said material from an inlet end to an outlet end, spraying liquid cryogen onto said material as it travels through said tunnel at a position proximate said outlet end, passing vapor or gas derived from said liquid cryogen in counter-current flow over said material passing through the tunnel, removing from said tunnel at a position proximate said inlet end an exhaust comprising said vapor or gas and atmospheric air entrained thereby through said inlet end, determining the rate of flow of the exhaust and the content of molecular oxygen in said exhaust, and calculating from the rate of flow of the exhaust and its oxygen content the rate of consumption of said liquid cryogen. The rate of consumption of vapor or gas derived from said liquid cryogen can be related to the rate of production of cooled material and the information used to control the operation of the tunnel in order to optimize the weight ratio of liquid cryogen consumed/cooled material.
479013
Gowling Lafleur Henderson Llp
Willhoft Edward M.a.
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