| 摘要 |
PURPOSE:To suppress the value of NOX contained in a waste gas to a defined value range in the entire region of a combustion load by controlling the bias ratio between respective burners responsive to the combustion state. CONSTITUTION:An adjusting operator 8 is set to store beforehand an NOX exhaustion defined value 9, and compares a flow quantity signal 17 from a fuel meter 15 and an NOX signal 6 from an NOX meter 4 with the NOX exhaustion defined value 9. The adjusting operator 8 further determines the bias ratio between respective burners so that the NOX value within the waste gas assumes a value which is less than the NOX exhaustion defined value 9, so as to set the opening degrees of bias ratio control valves 16a, 16b and 16c to the bias ratio.
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