Boiler system and control methods

Abstract

The invention relates to a boiler system and a method of control, in which the method under the invention comprises a procedure for effectively lowering the surface temperature of the tubes that make up the boiler system, thereby preventing high-temperature corrosion of the tubes. The boiler system (1) includes the pipe (first floating pipe (14), second connecting pipe (15), and reheating device pipe (40a)) for steam circulation, and the steam temperature control unit (pump (7), pipes (7a), (7b), (7c), second regulating valve (18), second regulating valve (19), third regulating valve (60), and control unit (30)) which lowers the temperature (T1, Tj, T5) of the steam circulating through the pipe below the predetermined temperature (T12, T34, Tm), by supplying fluid into the inside of the pipe.