Rotary tunnel freezer

Details Rotary tunnel freezer Rotary tunnel freezer

F - Mech Eng,Light,Heat,Weapons

25

D

F25D 3/11 (2006.01) F25B 19/02 (2006.01)

Patent

CA 2119994

- 10 - ABSTRACT ROTARY TUNNEL FREEZER A rotary tunnel freezer comprises a drum which is rotatable about its longitudinal axis. In use, liquid nitrogen is introduced into the drum through a spray header. Heat transfer throughout the drum is enhanced by further nozzles positioned at 500mm centres along the drum. The nozzles are positioned to eject gaseous or liquid nitrogen substantially tangentially to the drum a few centimetres from its inner surface. The nitrogen leaving the nozzles vigorously stirs the atmosphere in the drum and significantly enhances heat transfer there- by increasing the maximum production rate of existing rotary tunnel freezers or allowing shorter, and less costly, rotary tunnel freezers to be used for a given duty.

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