Patent ID: 7213402
Filing Date: 2007-05-08
Classification: B01D,F28D

Abstract:
1. Refrigeration-based compressed-gas dryer comprising a group of heat exchangers ( 10 ), this group of heat-exchangers including a gas-to-gas heat exchanger ( 20 ), an evaporator ( 30 ), a condensate separator ( 50 ) and at least a refrigerating circuit ( 40 ), wherein in said gas-to-gas heat exchanger ( 20 ) there is provided a pre-cooling section ( 22 ), where heat is exchanged between a mixture of compressed gases to be dried entering said group of heat exchangers ( 10 ), and a heating section ( 24 ) for a mixture of dried gases exiting a condensate separator ( 50 ), wherein in said evaporator ( 30 ) there is provided a cooling section ( 32 ), where heat is exchanged between said mixture of compressed gases to be dried exiting the gas-to-gas heat exchanger ( 20 ), and an evaporation section ( 34 ) for a refrigerant medium, where said mixture of compressed gases is cooled down to a desired dew point, characterized in that said group of heat exchangers ( 10 ) comprises a set of finned or embossed plates ( 21 , 31 , 33 ), which are stacked and joined with each other so as to be adapted to create a number of passages for the counter-current flow and/or cross flow and/or mixed flow of said gases, and that said group of heat exchangers is provided as a single-piece, unitary assembly.