Method and apparatus for cooling hot gases
AssigneeA. Ahlstrom Corporation
InventorOlli E. Arpalahti
Life of this patent
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Abstract
A method and apparatus for cooling the exhaust gases from a molten phase furnace, such as a smelting furnace. The exhaust gases are conveyed from the furnace to a vertically extending cooling shaft disposed above the furnace, where the exhaust gases are indirectly cooled by means of a cooling gas in a circulating system. From the cooling shaft, the exhaust gases are conveyed to a waste heat boiler, where heat is recovered from the exhaust gases as saturated or superheated, pressurized steam.
Claims21
A method of cooling exhaust gases from a molten phase furnace using a cooling shaft and waste heat boiler, comprising the steps of:
- (a) conducting the exhaust gases upwardly via the cooling shaft into the waste heat boiler;
- (b) recovering heat from the exhaust gases in the waste heat boiler in the form of saturated or superheated steam;
- and
- (c) positively cooling the gases in the cooling shaft by cooling the cooling shaft with circulating pressurized gas.
Apparatus for cooling exhaust gases from a molten phase furnace, comprising:
- a molten phase furnace having a roof and a gas outlet disposed in said roof;
- a waste heat boiler;
- an upwardly extending cooling shaft disposed directly above said furnace and connected to said furnace gas outlet and to said waste heat boiler, and for conducting exhaust gases from said furnace to said boiler;
- a steam turbine connected to said waste heat boiler;
- heat transfer surfaces provided on said cooling shaft;
- and
- an essentially closed gas circulation system for circulating a cooling gas through said heat transfer surfaces, said gas circulation system comprising a pressure compressor for pressurizing the cooling gas, and heat exchanger means for cooling the cooling gas.
Dependencies are inferred from the claim text.