Abstract: A method facilitates operation of an incinerator for solid fuel. The incinerator includes a device for separating ash from flue gas. The method includes collecting ash deposits originating from the flue gas, resulting in collected ash. To improve the flowability of the ash collected, the method further includes introducing a powdery additive material including i) clay and ii) calcium carbonate into the flue gas. At the location where the additive material is introduced, the flue gas has a temperature of at least 700° C. The additive is introduced with a rate R of at least 0.1 times the mass of ash in the stream of flue gas.

Abstract: A method of operating an incinerator (100) for solid fuel, said incinerator (100) comprising a device (160) for separating ash from flue gas, which method comprises the step of collecting ash deposits originating from the flue gas comprising ash from the incinerator (100) resulting in collected ash; To improve the flowability of the ash collected, the method comprises the step of introducing a powdery additive material comprising i) clay and ii) calcium carbonate into the flue gas comprising ash wherein the flue gas comprising ash has at the location where the additive material is introduced a temperature of at least 700° C., wherein the additive is introduced with a rate R of at least 0.1 times the mass of ash in the stream of flue gas comprising ash.

Abstract: A method of reducing corrosion of a heat exchanger of an incinerator, said method comprising the steps of—introducing oxygen-comprising gas and a particulate fuel into a combustion chamber,—introducing an additive material comprising i) clay and ii) calcium carbonate into the incinerator,—recuperating heat from the flue gas using a heat exchanger. For protecting the heat exchanger, the additive material is a powdery material that is introduced into the flue gas upstream of the heat exchanger, a powder particle of said powdery additive material comprising granules, each granule comprising a mixture of clay and calcium carbonate, at least 10% by weight relative to the calcium carbonate being calcium carbonate in a form that when characterized by means of Thermogravimetric Analysis under a nitrogen atmosphere with a rate of increase in temperature of 10 JC per minute has decomposed completely when a temperature of 875° C. has been reached.

Abstract: The invention relates to a method of improving a material comprising a pozzolanic component. According to the invention the material is treated with an aqueous liquid resulting in treated, calcium-depleted material and a calcium-enriched aqueous solution, which are subsequently separated. This provides a material having an increased pozzolanity and/or increased specific surface area.