| 摘要 |
PURPOSE:To easily prevent black smoke from being generated and effectively suppress the generation of substances causing environmental pollution such as NOx and the like by adding a correction signal related to a CO value to an O2 setting signal when the CO concentration increases beyond a predetermined value. CONSTITUTION:A signal emitted from an O2 densiometer 1 is applied to an adjustor 6. A signal emitted from a flowmeter 2 for detecting the quantity of variation which becomes a load of a combustion furnace is applied to a function generator 3. A signal emitted from a CO densiometer 8 is applied to a function generator 18. The function generator 18 generates an O2 setting signal which increases O2 when the CO concentration signal exceeds a predetermined value, and in an adder 5, and the O2 setting signal thus generated is added to the function generator 3 and the O2 setting signal. An output signal of an adjustor 6 added with an O2 setting signal SV and an O2 concentration signal PV, is output corrected so that the output becomes a 50% output at a deflection of zero in an arithmetic unit 19, and is output to an air flow quantity adjusting system 20 via a limiter 7. When in an optimum operational state at a low air excess percentage, correction in terms of CO value is not made for the O2 setting signal. |
