| 摘要 |
PURPOSE:To obtain the feed back control device for controlling a burning furnace due to a measured quantity without time delay by a method wherein the direct observation of the inside of a burning furnace is performed, and the measurement of an unburnt quantity which is called in question in a finely-pulverized coal burning furnace is performed. CONSTITUTION:A spectral analysis is performed with a spectroscope 30 through view port 20, an exhaust gas analysis is performed with an exhaust gas analyzer 50 branched from a flue 40, and an unburnt quantity remained in a burnt ash which is obtained from a dust sampler 60 is measured with a differential thermobalance. The relation between the C2 radical emission intensity ratio and the unburnt quantity remainded in the ash is indicated by a calibration curve shown in the figure. In such a manner, if only the calibration curve concerning an arbitrary furnace is obtained, instantly, the unburnt quantity remained in the ash is directly obtained from the emission of a flame with the spectroscope. The controlling of a burning furnace by the feed back from the unburnt quantity remained in the ash causes the signal to be outputted from the spectroscope 30 to a recorder and the like, then an air supply control valve 13 and a finely-pulverized coal supply control valve 15 are controlled by utilizing the calibration curve from said unburnt quantity. Thereby, the controlling is performed by direct observation of the flame itself. |
