Patent ID: 8752384

Claim:
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.