F - Mech Eng,Light,Heat,Weapons – 23 – R
Patent
F - Mech Eng,Light,Heat,Weapons
23
R
60/2
F23R 3/02 (2006.01) F02C 3/36 (2006.01) F02C 6/00 (2006.01) F02C 6/04 (2006.01) F02C 7/08 (2006.01)
Patent
CA 1176474
ABSTRACT The invention is concerned with a method of recovering heat from smoke gases in a combustion plant, comprising the steps of compressing air for combustion to a first intermediate pressure in a first compressor, then compressing the air to a second higher pressure in a second compressor, passing the air at the second higher pressure to a combustion chamber, and burning a com- bustible fuel in the presence of the air at the second higher pressure in the combustion chamber to produce smoke gases at substantially the second higher pressure. The smoke gases at the second higher pressure are passed through a first turbine to drive the turbine and reduce the pressure of the smoke gases to a second intermediate pressure, the first turbine being connected to the second compressor for driving the same. Thereafter, water vapor in the smoke gases at the second inter- mediate pressure condensed to regain the heat of vaporization of the water vapor in the smoke gases, and then the smoke gases are passed through a second turbine to drive the turbine and reduce the pressure of the smoke gases to atmospheric pressure, the second turbine being connected to the first compressor for driving the same. The method of the invention can be carried out in a combustion plant comprising first and second compressors connected in series to raise the pressure of combustion air from atmospheric pressure to a first intermediate pressure and thence to a second higher pressure, and at least one combustion chamber operatively connected to the second compressor for burning fuel in the presence of the combustion air for producing compressed smoke gases at substantially the second higher pressure. A first turbine is operatively connected to the combustion cham- ber and the second compressor for receiving the com- pressed smoke gases and reducing the pressure thereof to a second intermediate pressure thereby converting the pressure of the smoke gases to mechanical energy driving the second compressor means. A condenser is connected to the first turbine for receiving the expanded smoke gases therefrom and recapturing the heat of evaporation from the water vapor in the gases. A second turbine is operatively connected to the condenser and the first compressor for receiving the expanded smoke gases from the condenser and reducing the pressure thereof to atmospheric while converting the pressure of the smoke gases to mechanical energy driving the first compressor.
373077
Carlqvist Stig G.
Tiberg Lars A.
Fagersta Ab
Swabey Ogilvy Renault
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