Patent ID: 9726375
Date: 2017-08-08
CPC Classifications: B01D,F23J,F23L,F23N,Y02C,Y02E

Claim:
1. A boiler system comprising an oxyfuel boiler in which a stream of oxygen and a fuel are combusted to generate a stream of flue gas, a flue gas compression unit for producing a stream of pressurized carbon dioxide rich flue gas, a flue gas condenser for condensing cleaned flue gas, a pressure control system in which the pressure before the flue gas condenser is measured and controlled to at least one predetermined set value, and a flow control system in which the flow after the flue gas compression unit is measured and controlled to a predetermined set value, wherein the pressure control system establishes a pressure value at which the boiler system operates, and controls the boiler system to operate in an air inlet mode when the pressure value at which the boiler system operates is below a predetermined first set value, and controls the boiler system to stop operation in the air inlet mode when the pressure value at which the boiler system operates is at or above the predetermined first set value, said air inlet mode including introducing air from the atmosphere as an air stream to at least part of a carbon dioxide containing stream from the flue gas condenser to be forwarded to the flue gas compression unit.