| 摘要 |
PROBLEM TO BE SOLVED: To obtain a heat medium boiler that can further effectively utilize the heat of exhaust gas discharged therefrom to efficiently preheat combustion air fed into a burner.SOLUTION: The heat medium boiler includes a recuperator 10 for exchanging heat between the exhaust gas discharged from the heat medium boiler and the combustion air fed into the burner 1 from a blower 7 to preheat the combustion air. In the heat medium boiler, a suction air path B is formed so as to allow low-temperature combustion air to flow along a surface of a duct 16 through which high-temperature gas circulates, accordingly, the heat of the external surface of the duct 16 through which high-temperature gas circulates is transferred to a combustion air side which is a lower temperature side, and thus the low-temperature combustion air is heated. |
