Patent ID: 7767027

Claim:
A method for removing combustion residues from interior surfaces of a chamber within a steam generator, the chamber carrying combustion gases therein and the combustion residues being deposited in the chamber by the combustion gases, which comprises the steps of: a) making contact between the combustion residues on the interior surfaces of the chamber carrying the combustion gases in the steam generator and a first cleaning medium resulting in pretreated combustion residues; b) making contact between the pretreated combustion residues on the interior surfaces of the chamber carrying the combustion gases in the steam generator and a second cleaning medium for removing the pretreated combustion residues from the interior surfaces of the chamber carrying the combustion gases in the steam generator, with the first cleaning medium and the second cleaning medium differing at least with regard to a physical state; and cleaning the chamber while at a same time the combustion gases flow through the chamber.