Process and arrangement for operating a steam power station

F - Mech Eng,Light,Heat,Weapons – 01 – K

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F01K 23/06 (2006.01) F02C 3/20 (2006.01) F22B 1/24 (2006.01)

Patent

CA 1119007

ABSTRACT OF THE DISCLOSURE A method and arrangement are disclosed for operating a steam power plant having a steam generator heated by a fluid- ized bed furnace. The fluidized bed is provided with pressurized combustion air which permits a reduction in the bed dimensions. Combustion gases heat feedwater passing through a series of heat exchangers in the steam generator to provide a working fluid for a steam turbine. The steam turbine operates an electrical current generator. The electrical current generated by the generator is the product of a purely steam generating process. The combustion gases are also used for superheating the steam and for preheating recirculated feedwater in a heat exchanger contained within the steam generator. The combustion gases also drive a gas turbine which is connected to a compressor, with the compressor supplying the pressurized combustion air to the fluidized bed. After vaporizing the feedwater, superheating the steam, preheating the feedwater and driving the gas turbine, the combustion gases are at such a low temperature that they can be passed directly into the atmosphere through a chimney. An increase in the thermal efficiency of the system is provided by the use of the combustion gases to preheat the feedwater and drive the gas turbine.

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