| 摘要 |
<p>PURPOSE:To quickly start catalytic combustion and maintain a stable combustion condition by using a honeycomb PTC heater as an ignition source for a catalytic combustor and regulating a flow rate control damper so as to control the amount of air flow. CONSTITUTION:A combustor has a honeycomb PTC heater 5 and a flow rate control means 4 which, placed ahead of the PTC heater 5, controls the air flowing through the PTC heater 5 so as to maintain a constant catalytic combustion temperature. To start the combustion, the PTC heater 5 is first energized, and at the same time, an air blower fan 3 is operated to supply air so as to preheat a catalyzer 1 with hot air. Since the quantity of heat generated by the PTC heater 5 can be controlled at an air flow rate, the catalyzer 1 is quickly heated by increasing the air flow rate during the initial stage. As the temperature of the catalyzer 1 rises, the air flow rate is reduced. At the moment when the temperature of the catalyzer 1 is high enough for igniting fuel, fuel supply is started to begin the catalytic combustion. Since the PTC heater 5 has a characteristic that the electrical resistance increases as the temperature rises, it can act as a thermistor which monitors the combustion conditions to maintain the stable combustion.</p> |
