Prediction and suppression of slopping in the converter.
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概要
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Experiments were done on the prediction of slopping through direct observation of in furnace condition with an image fiberscope and by image processing and on the suppression of slopping by coke breeze injection. As a result, the following findings were obtained.(1) Slag foaming is detected by direct observation of the condition in converter with an image fiberscope.(2) The slag expansion rate at the occurrence of slopping is 1.2-1.5 m3/s. Slopping is predicted about 30-40s before its occurrence by providing an observation hole at a location of 2.5m below the converter top.(3) Slopping is automatically predicted by the identification of portions corresponding to the slag and the flame through processing of the image signals obtained by the camera, by the calculation of the ratio of area corresponding to the slag, and by the combination of change in ratio with the lapse of time with the process information.(4) Slopping is suppressed nearly 100% by direct injection of coke breeze into the foaming slag at a rate of 200kg/min for 1-2min.(5) It is considered that the suppression of slopping by direct injection of coke breeze into the foaming slag is attributable to the loss of foam stability by local reduction of slag (for example, decrease in local concentration of P2O5).(6) The occurrence ratio of slopping is been reduced from 22 to 2.7% by the application of this slopping prediction and suppression system to the commercial process, resulting in the elimination of large disturbance for blowing control.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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