Patent ID: 6672259
Filing Date: 2004-01-06
Classification: F22B,F22G,Y02E

Abstract:
A method for positioning superheaters (2, 3, 4, 5) in biomass burning steam generators for minimizing the corrosion of superheater surfaces at a high temperature, wherein the steam generator is fitted with at least two superheaters (2, 3, 4, 5), whose positioning in a flue gas duct (6) and serial arrangement in a steam circuit (7) are effected in such a way that the superheater's or superheaters' heat transfer surface has its surface temperature remaining below the melting point of KOH, 406Â° C. (corresponds to a steam temperature of about 350-380Â° C.) down to the point in the flue gas duct (6), at which the flue gases' temperature has fallen to 750Â° C., and that, while the flue gases are within the range of less than 750Â° C., the final superheating is effected to a higher temperature without significantly increasing the contamination and corrosion hazard for superheater surfaces.