| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability of a burner part and lower the amount of exhaust of NOx by making the temperature of the primary combustion air of combustion air supplied to the burner part lower than that of secondary combustion air supplied to a combustion chamber. SOLUTION: This combustion device 11 is provided with an air preheater 102 for preheating combustion air by carrying out a heat-exchanging between combustion air supplied to a combustion chamber 101 and combustion gas exhausted from the combustion chamber 101. The primary combustion air A1 of the combustion air supplied through a blower 103 does not pass through the air preheater 102 nor is preheated and is supplied to a burner part 104. Secondary combustion air A2 passes through the air preheater 102 and is preheated, and then, supplied to the combustion chamber 101. All the heat of the combustion gas exhausted from the combustion chamber 101 is recovered only by the secondary combustion air A2. Thus, the temperature of the primary combustion air A1 supplied to the burner part 104 is lower than that of the secondary combustion air A2 supplied to the combustion chamber 101. |
