| 摘要 |
PURPOSE:To prevent a dew condensing phenomenon from occurring in a supply duct by making constant the circulation amount of a combustion waste gas and spraying water within the combustion chamber in accordance with the rise in the temperature within the combustion chamber or the increase in the NOX concentration in the combustion waste gas to lower the temperature within the combustion chamber. CONSTITUTION:At the upper part of a combustion chamber 2 is provided a flue 7. A combustion waste gas 8 drawn out of the flue is discharged to the atmospheric air by an exhaust fan 11 via a temperature reducing tower 9 and a dust collector 10. A part of the discharged gas is blown into the combustion chamber 2 by a waste gas circulating fan 12. Upon this occasion, the amount of the combustion waste gas 8 circulated is made constant to prevent the dew condensing phenomenon from occurring due to the flow rate variation within the waste gas circulating duct, in a case where a temperature sensor is provided in the combustion chamber 2, the combustion condition within the combustion chamber 2 is excellent, and the combustion temperature is excessively raised or where the concentration of NOX in the combustion waste gas 8 is measured by an NOX meter 15 and the concentration of NOX in the combustion waste gas 8 is increased by the rise in the temperature in the combustion chamber 2, an adjusting valve 14 is opened, and water is sprayed within the combustion chamber 2 by a water spray pump 13. Then, the temperature within the combustion chamber 2 is lowered.
|
