Method for generating a stress reduction in erected tube walls of a steam generator

A method for erecting tube walls, which surround a combustion chamber of a steam generator of a fossil-fired power plant, comprising:

• placing manufactured tube wall regions or tube wall segments into their installation position, in which they surround the combustion chamber in the steam generator by arranging and erecting the manufactured tube wall regions or tube wall segments so as to surround the combustion chamber of the fossil-fired power plant;
• welding the manufactured tube wall regions or tube wall segments together to form large-area formed erected steam generator tube walls;
• and
• subsequently subjecting substantially an entirety of the manufactured tube wall regions or tube wall segments of the large-area formed erected tube walls in their installation position in the installed state in the steam generator, to a stress-relief annealing process by heating substantially the entirety of the large-area tube wall regions or tube wall segments with a warmed heating gas, a hot gas, a hot flue gas, or a hot air, wherein the stress-relief annealing process comprises:
• generating, within the combustion chamber of the steam generator, the warmed heating gas, the hot gas, the hot flue gas, or the hot air through the combustion of a fuel, or introducing the warmed heating gas, the hot gas, the hot flue gas, or the hot air into at least one of the combustion chamber of the steam generator and the tubes of the tube wall regions or tube wall segments for heat treatment, and
• supplying the warmed heating gas, the hot gas, the hot flue gas, or the hot air to at least one of the outside and the inside of the tube wall regions or tube wall segments for heat treatment as part of the stress-relief annealing process, wherein the tube wall regions or tube wall segments are part of a diaphragm wall.