PROCESS FOR THE TREATMENT OF GAS PHASE ALKALINE CHLORIDE IN A COMBUSTION PLANT, COMBUSTION PLANT FOR CARRYING OUT THE PROCESS, AND THE USE OF A PHOSPHOROUS SUBSTANCE FOR THE TREATMENT OF ALKALINE CHLORIDE IN GASEOUS PHASE IN A COMBUSTION PLANT

摘要

A process for the treatment of gas phase alkaline chlorides in a combustion plant that is arranged for combustion of solid fuel and which includes a combustion chamber from which a flue-gas flow is directed to pass a heat transfer device. 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. 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. A corresponding combustion plant is disclosed, as well as the use of a phosphorous substance for phosphatising alkaline chloride in gaseous phase in a flue-gas flow.