| 摘要 |
PURPOSE:To operate and control a furnace safely and efficiently by evaluating qualitatively nitrogen oxides contained in combustion exhaust gas, the of unburnt matters in ash and the power of a pulverized coal machine as a fuzzy quality and controlling a coarse particle separator which determines a two-step combustion air proportion and the size of pulverized coal on the basis of said evaluation. CONSTITUTION:Data on the concentration of nitrogen oxides contained in combustion exhaust gas, data on the concentration of unburnt matters in ash and data on the power of a pulverized coal machine are set as a fuzzy quantity to be qualitatively evaluated by corresponding membership functions, respectively, whereby a control rule meeting a value evaluated by a preset control rule is retrieved to infer each of optimum operation rates of a two-step combustion air proportion and a coarse particle separator 13 on the basis of a fuzzy inference. Nitrogen oxides contained in exhaust gas is suppressed by adjusting a two-step combustion air damper 18 on the basis of the inference and controlling the two-step combustion air proportion in a two-step combustion method, whereby the opening degree of, or the number of rotations of, a vane of the coarse particle separator 13 is controlled to vary the size of pulverized coal and suppress unburnt matters in ash contained in the exhaust gas.
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