| 摘要 |
PURPOSE:To suppress the corrosion of components such as a burner, a nozzle, etc., when exhaust gas is recirculated. CONSTITUTION:An exhaust circulating conduit 11 is branched from an exhaust passage 9 of a downstream side of an exhaust fan 8 to a combustion chamber 2. An exhaust port 13 at the end of the conduit 11 is disposed at the downstream side from a burner port 14. As a result, since burnt exhaust gas to be exhausted from the port 13 is not brought into direct contact with a burner 3, etc., it is not corroded with components contained in the gas. |
