Patent ID: 8695514

Claim:
An air infiltration abatement system for a power plant having an oxygen fired boiler, the air infiltration abatement system comprising: a recirculated flue gas source; a recirculated flue gas supply line connected to the recirculated flue gas source; and a power plant component, the power plant component having a leakage area in fluid communication with the recirculated flue gas supply line, wherein the recirculated flue gas source receives a combustion flue gas from the oxygen fired boiler and provides the combustion flue gas to the recirculated flue gas supply line, and the recirculated flue gas supply line supplies the combustion flue gas as a recirculated flue gas to the oxygen fired boiler via the leakage area of the power plant component; and a seal box comprises a sleeve in communication with the leakage area of the power plant component, and the recirculated flue gas is further supplied the oxygen fired boiler, via the leakage area of the power plant component, through the sleeve of the seal box; wherein the seal box surrounds a connection area and wherein a sootblower penetrates the sleeve and a wall of the oxygen fired boiler to provide the sootblowing steam to the interior space; the recirculated flue gas displaces an additional gas in the leakage area of the power plant component such that the additional gas is prevented from leaking into the oxygen fired boiler; a pressure regulating part includes a seal gas fan, a pressure sensor and a pressure regulating valve disposed therebetween; the pressure regulating sensor provides signal to the pressures regulating valve, and the pressure regulating valve regulates a pressures of the regulating flue gas based on the signal; the pressure regulating part selectively controls the pressure of the regulating flue gas at the pressure sensor such that a downstream pressure; the pressure regulating part maintains a pressure differential between the downstream pressure and the pressure interior space at a value which effectively prevents the additional gas from flowing into the interior space and wherein the leakage of the additional gas into the interior space is substantially reduced and/or effectively minimized.