Boiler

Abstract

Only suspension type superheaters (52) and (53) are disposed in an outlet of a furnace. These superheaters have heat transfer areas which are so dimensioned that an exhaust gas temperature at downstream of the superheaters is 1000.degree. C. to 1100.degree. C. when the boiler is under a maximum load. An exhaust gas passage downstream of the superheaters (52) and (53) is divided into sub passages along a flow of an exhaust gas, and a damper is disposed in an outlet of each of the sub passages for adjusting a flow rate of the exhaust gas flowing through the respective sub passages. A traverse type reheater (41) is disposed in the sub passage. Since a difference between a temperature (1000.degree. C. to 1100.degree. C.) of the exhaust gas flowing around the reheater (41) and a temperature of steam flowing through the reheater (41) is large, heat exchange can be performed with a high efficiency even through a small heat transfer area. Accordingly, this configuration makes it possible to prevent a heat transfer area of the reheater (41), or overall dimensions of a boiler from being increased.

Dependencies are inferred from the claim text.