Carbon dioxide capture interface and power generation facility
OwnerEsko Olavi Polviinventor
Life of this patent
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Abstract
An interface for a pressurized fluidized bed combustion facility is disclosed that enables future addition of carbon dioxide capture technology to capture facility flue gas emissions. The interface includes a gas to water pressurized heat recovery steam generator to cool facility flue gas and provide steam to the facility steam turbine generator. A VFD motor and flue gas expander are coupled to a combustion air compressor to energize the facility. The expander is synchronized over a SSS-clutch to drive the compressor. The interface in combination with carbon capture technology and methods for conditioning flue gas are also disclosed.
Claims20
An interface for reducing emissions from a pressurized fluidized bed combustion facility, said interface comprising:
- an air compressor that is connected to the pressurized fluidized bed combustion facility and that supplies compressed air to the fluidized bed combustion facility;
- a gas to water pressurized heat recovery steam generator that receives flue gas from the fluidized bed combustion facility at a first input and that receives water at a second input, said heat recovery steam generator also having a first output that discharges flue gas and a second output that discharges steam at times when the temperature of flue gas that is discharged at the first output is lower than the temperature of flue gas that is received at the first input;
- a steam turbine generator that receives steam from the second output of the gas to water pressurized heat recovery steam generator, said steam turbine generator generating electrical energy in response to steam inflow from the pressurized heat recovery steam generator, said steam turbine generator being electrically connected to a motor that powers said air compressor;
- and
- a flue gas expander that is in communication with the first output of said gas to water pressurized heat recovery steam generator, said flue gas expander being mechanically connected to said air compressor to power said air compressor in response to flue gas from the pressurized heat recovery steam generator, said flue gas expander powering said air compressor in combination with the motor that is electrically connected to the steam turbine generator.
An interface that enables the selective addition of carbon dioxide capture from the flue gas of a pressurized fluidized bed combustion facility, said interface comprising:
- a combustion air compressor, configured to supply combustion air to the combustion facility;
- a VFD electric motor coupled to the combustion air compressor;
- a gas to water pressurized heat recovery steam generator that is connected to a water supply and to a steam turbine generator of the combustion facility, said pressurized heat recovery steam generator also being connected to the pressurized bed combustion facility and receiving pressurized flue gas from the fluidized bed combustion facility, said heat recovery steam generator lowering the temperature of the pressurized flue gas from the combustion facility and providing steam to the steam turbine generator of the combustion facility;
- a steam turbine generator that receives steam from the heat recovery steam generator and that generates electrical power in response to said steam from the heat recovery steam generator and provides electrical power to said VFD electric motor;
- a feedwater heat exchanger for preheating feedwater of the combustion facility and cooling the pressurized flue gas;
- a pollutant reduction unit configured to remove pollutants from the cooled pressurized flue gas from the feedwater heat exchanger;
- and
- a flue gas expander driven by the flue gas from the pollutant reduction unit, wherein the expander is synchronized over an SSS-clutch to drive the compressor in combination with the VFD electric motor.
A method to condition pressurized flue gas from a pressurized fluidized bed combustion facility to supplement the power needed to run the combustion facility comprising:
- reducing the temperature of flue gas from the combustion facility in a gas to water pressurized heat recovery steam generator;
- providing steam from the heat recovery steam generator to a steam turbine generator of the combustion facility;
- reducing the temperature of pressurized flue gas from the heat recovery steam generator in a feedwater heat exchanger;
- reducing pollutants from the flue gas;
- and
- expanding the flue gas in a gas expander to drive a compressor, wherein the compressor generates compressed air to fuel the combustion facility.
Dependencies are inferred from the claim text.