US 4,223,529 AGranted

Combined cycle power plant with pressurized fluidized bed combustor

AssigneeGeneral Electric Company

InventorDavid M. Willyoung

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Abstract

An improved combined cycle gas turbine and steam turbine power plant is disclosed in which the energy source for both the steam turbine portion of the system and the gas turbine portion is a pressurized fluidized bed combustor fueled by a carbonaceous fuel such as coal. Combustion gas discharged from the pressurized combustor is processed for minimal cleanup and temperature conditioning prior to passage through a heat exchanger to heat a stream of pressurized air for driving an air-gas turbine. Following the loss of sensible heat energy through the heat exchanger, the lower temperature combustion gas is expanded through a second, combustion gas turbine so that a portion of the remaining energy is extracted at a lower temperature, avoiding problems of hot gas corrosion and fouling within the turbine. A compressor, driven by one or both gas turbines, provides both the pressurized air supply for fluidization of the bed and the stream of air to the air-gas turbine. The fluidized bed contains fuel and sulfur-sorbing particles, the latter capturing and retaining sulfur oxide compounds to prevent emission thereof to the atmosphere. Heat exchangers located within the fluidized bed combustor serve as steam generating means for the steam turbine portion of the power plant.

Claims9

Dependent claims

A combined cycle power plant, comprising:

(a) a gas turbine portion including a combustion gas turbine section, an air turbine section, and a compressor section, said compressor section adapted to supply first and second streams of pressurized air;
(b) a pressurized fluidized bed combustor for combustion of carbonaceous fuel, said combustor having a bed of fluidizable sulfur-sorbing particles and carbonaceous fuel particles, a first inlet for receiving said first stream of pressurized air, a second inlet for receiving carbonaceous fuel, a third inlet for receiving sulfur-sorbing particles, a first outlet for discharging a stream of pressurized combustion gas and particulates entrained therein, and a second outlet for discharging spent sorbing particles and ash solids;
(c) means for removal of particulates from said stream of combustion gas, said removal means having an inlet for receiving said combustion gas and entrained particulates from said fluidized bed combustor, and an outlet for discharging said combustion gas;
(d) a first heat exchanger for transferring heat energy from said combustion gas stream to said second stream of pressurized air, said heat exchanger having a first inlet for receiving said combustion gas stream from said particulate removal means, a second inlet for receiving said second stream of pressurized air, a first outlet fluidly connected to said combustion gas turbine for discharging said combustion gas stream thereto as motive fluid therefor, and a second outlet fluidly connected to said air turbine for discharging said second stream of pressurized air thereto as motive fluid therefor;
(e) a steam turbine;
and
(f) steam generating means in said fluidized bed combustor for furnishing steam to drive said steam turbine.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/063,469Filed 3 Aug 1979
Granted: 23 Sep 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F01K 23/062
With combustion in a fluidised bed: the combustion bed being pressurised
F02C 3/28
The fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension: using a separate gas producer for gasifying the fuel before combustion
F02C 3/365
Open cycles: a part of the compressed air being burned, the other part being heated indirectly
F02C 6/10
Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output: supplying working…