A process for the treatment of gas phase alkaline chlorides in a combustion plant, combustion plant for carrying out the process, and the use of a phosphorous substance for the treatment of gas phase alkaline chlorides in a combustion plant

摘要

The invention refers to a process for the treatment of gas phase alkaline chlorides in a combustion plant that is arranged for combustion of solid fuel and which comprises a combustion chamber from which a flue-gas flow is directed to pass a heat transfer device. According to the process a phosphorous substance is added to the flue-gas flow, separate from the fuel, the substance chosen from a group of substances that form phosphorous oxide at combustion temperatures of approx. 500 °C or above, wherein the phosphorous substance is distributed in the flue-gas at a location upstream of the heat transfer device as viewed in the flow direction of the flue-gas, and wherein the phosphorous substance is added to an amount which results in phosphatising of gas phase alkaline chlorides included in the flue-gas flow before the chlorides reach the heat transfer device. Analogously herewith a combustion plant is disclosed and arranged for carrying out the process, as well as the use of a phosphorous substance for phosphatising alkaline chloride in gaseous phase in a flue-gas flow.