| 摘要 |
PROBLEM TO BE SOLVED: To heat largely-fluctuating exhaust gas to a fixed given temperature so as to generate hot air in which less amount of CO is mixed. SOLUTION: Feed rate of fuel is controlled by a fuel control valve 3 before fed to a burner 1 in a primary combustion chamber. Thus fed fuel is mixed with combustion air which is supplied from a combustion air blower 2, with the feed rate being controlled by a differential pressure control damper 5 or the like, to the burner 1 through a combustion air damper 7 and a combustion air duct 6 for primary combustion for generating primary combustion gas. The primary combustion gas is mixed with secondary combustion air that has been preheated in a secondary combustion air supply chamber which is provided at the periphery of a primary combustion chamber and supplied through a blowing nozzle 13 which is provided around the exit of the primary combustion chamber for secondary combustion for generating hot air. Then detection is made as to the differential pressure between the combustion air before being separated into the primary combustion air and the secondary combustion air, and the hot air at the hot air exit. The feed rate of the combustion air is controlled so that the differential pressure is made constant, followed by separate combustion of the combustion air by primary and secondary to generate hot air.
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