| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an operating method of a blast furnace with which the operation is stably continued by accurately managing and controlling furnace heat. SOLUTION: The differential value between a calculated value of molten iron temperature at the starting time of prediction calculated by using the operational data in every moment while correcting the reaction speed of a mathematical model in the furnace and a calculated value of molten iron temperature at the completing time of the prediction in the case of holding the operational condition at the above starting time of the prediction, is obtained so that the reaction quantity in the furnace (calculated reaction quantity) calculated by inputting the operational data in every moment into the mathematical model in the blast furnace under consideration of reaction speeds in the main reaction (indirect reducing reaction of ore, hydrogen reducing reaction and indirect reducing reaction of ore) generated in the blast furnace agrees with the reaction quantity in the furnace (actual reaction quantity) calculated by further inputting the furnace top gas composition. Then in the case of predicting that this differential value is deviation from the range of preset control threshold value, the change of the operational condition for avoiding the lower of the furnace heat, is executed.</p> |
