| 摘要 |
<p>PURPOSE:To provide the operation of a burner employing catalyst in a short time with an excellent exhaust gas characteristics by igniting an auxiliary burner port section with flame and burning there as the temperature of an auxiliary catalyst layer that is provided in an exhaust gas channel on the downstream side of a main catalyst layer is raised to temperature which is sufficiently active by using a sheath heater, etc. CONSTITUTION:Fuel (kerosene) is vaporized in a mixing chamber 4 and at the same time it is sent to an auxiliary burner port section 6 at the upper section after its premixing with sufficient air. At this time the flame is ignited by an ignition electrodes 7 and flame combustion is started there. At this time high temperature exhaust has flows to the upper section, and flows to the downstream side (rear face) via a communicating hole 8a and reaches an auxiliary catalyst layer 10 in the exhaust gas channel, raising the temperature of a main catalyst layer 8. At this time since the temperature of the auxiliary catalyst layer 10 is already sufficiently raised by a sheath heater B11, the gases CO, HC in the exhaust gas are purified as they pass through the communicating hole 10a and discharged from an exhaust gas hole 12. And at the auxiliary burner port section 6 flame is burned for a certain time, and when the temperature of the main catalyst layer 8 is raised to sufficiently active temperature (temperature over about 300 deg.C required) the supply of the fuel is once stopped so that the flame goes out and then the supply of the fuel is started again.</p> |
