To suppress corrosion of a superheater and improve generating efficiency, in a heat storage type heat exchanger used in a refuse incineration generating plant and formed so that refuse, such as city refuse and industrial waste, is incinerated for processing and its incineration waste heat is utilized for generation.

The heat storage type heat exchanger comprises an exhaust gas duct 2, a pipe 3, powder 4, a super heater 5, and circulation means 6. Especially, heat exchange is effected between exhaust gas A and the powder 4 through the pipe 2, and steam B flowing through the superheater 5 is superheated by the powder 4 after heat exchange.