Patent ID: 8318118

Claim:
A process for the treatment of gas phase alkaline metal chlorides in flue-gas of a solid fuel combustion plant to reduce chlorine-induced corrosion, the plant having a combustion chamber from which a flue-gas flow is directed to pass a heat transfer device, the process comprising: (i) adding a phosphorous substance to the flue-gas flow the substance being selected from a group of substances that form phosphorous oxide at combustion temperatures of about 500° C. or above, wherein, the phosphorous substance is added separate from the fuel, and is distributed in the flue-gas at a temperature in a range of 500-1200° C. at a location upstream of the heat transfer device as viewed in the flow direction of the flue-gas, and (ii) phosphatising the gas phase alkaline metal chlorides in the flue-gas before the chlorides reach the heat transfer device.