| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating device capable of reducing a use amount of fuel by improving fuel economy.SOLUTION: A heating device 30 includes a burner 31 for jetting a combustion gas 20 in which a fuel 22 is burned toward a combustion space 3 of a heating furnace 1, and discharges an exhaust gas 26 after heating the combustion space 3 from an exhaust gas discharge passage 36. A first heat exchanger 31a disposed in the exhaust gas discharge passage 36 is incorporated in the burner 31, and a second heat exchanger 38 is disposed in the exhaust gas discharge passage 36 on the further downstream than the first heat exchanger 31a. Air 24 for combustion mixed in the fuel 22 in combustion is supplied to the burner 31 from an air passage 34, and the second heat exchanger 38 is disposed on the upstream side of the air passage 34 and the first heat exchanger 31a is disposed on the downstream side of the air passage 34 respectively. Heat is imparted to the low-temperature air 24 for combustion from the high-temperature exhaust gas 26 by comparing with each other by the first heat exchanger 31a and the second heat exchanger 38, so that fuel economy is improved and the use amount of the fuel 22 can be reduced.SELECTED DRAWING: Figure 4 |
