FÖRFARANDE OCH ARRANGEMANG FÖR ÅTERVINNING AV VÄRME UR BOTTENASKAN I EN FÖRBRÄNNINGSPROCESS

摘要

A method of recovering heat from bottom ash that is discharged from a combustion process in a furnace. Fuel and combustion air are fed into a furnace for combusting the fuel in order to generate heat energy to produce steam or hot water in a boiler arrangement, in which flue gases and bottom ash are formed. The bottom ash is discharged from the furnace. Heat is recovered from the flue gases, and heat is recovered to a bottom ash cooling water circuit from the bottom ash discharged from the furnace in order to utilize the recovered heat for preheating the combustion air in a heat exchanger.