Patent ID: 9593846
Date: 2017-03-14
CPC Classifications: F22B,F23C,F23J,F23L,F23N,Y02E

Claim:
1. A boiler plant apparatus comprising: a power generation system having a furnace volume; an oxyfuel firing system for oxyfuel combustion of fossil fuel in the furnace volume; an induced draft fan with modulated vent damper to remove gases from the furnace volume; a compression system, disposed downstream from the induced draft fan, configured to compress gases exhausted from the furnace volume after combustion, wherein the compression system includes at least one CO2 compressor; a control system adapted to control pressure within the furnace volume by controlling the compression system to cause modulation of the mass flow of exhaust gases through the at least one CO2 compressor of the compression system downstream from the furnace volume without continuously venting the exhaust gases to the atmosphere, and extracting a fractional amount of the exhaust gases to be recycled in the oxyfuel firing system; and a forced draft fan to force the flue gases into the furnace volume; wherein the pressure within the furnace volume is dynamically varied by the compression system modulating the mass flow of the exhaust gases through the at least one CO2 compressor based on changes in operating requirements of the oxyfuel combustion in the furnace volume in response to changes in load demand by controlling at least one of a speed of the CO2 compressor or a damper of the CO2 compressor to thereby vary the fractional amount of the exhaust gases to be recycled in the oxyfuel firing system based on variations of at least one of a fuel flow or a furnace leakage flow.