| 摘要 |
<p>PURPOSE:To present a method and device that can be adopted regardless of the burning temperature and reduce NOx effectively by supplying fuel on the upstream side in the direction of the combustion exhaust gas flow from the heat exchanger when the temperature in the furnace or the combustion exhaust gas temperature is higher than a set value and supply air on the downstream side in the direction of the combustion exhaust gas flow from the spot where the fuel is supplied. CONSTITUTION:When the temperature in the furnace or the combustion exhaust gas temperature is higher than a set value, fuel that gives a reducing reaction to NOx in the combustion exhaust gas is supplied to the combustion exhaust gas that flows through an exhaust gas channel 7 on the upstream side in the direction of the combustion exhaust gas flow from a heat exchanger 12, and the air to burn the fuel that is left unburned is supplied to the downstream side in the direction of the combustion exhaust gas flow from the fuel supplying spot. Here a temperature sensor 13 that detects the temperature in the furnace or the combustion gas temperature, fuel supply means 15, 17, and air supply means 19 are provided, and fuel is supplied when the temperature detected by the temperature sensor 13 is higher than a set value. With this arrangement the method and device in the title can be adopted regardless of the calcining temperature and NOx can be reduced effectively.</p> |
