| 摘要 |
PURPOSE:To detect the abnormality in the descending of charging materials in a blast furnace and the forming positions of the materials stuck on the furnace walls accurately by comparing the distributions of the descending speed of the charging materials in a vertical direction with theoretical values. CONSTITUTION:Since the sectional area in the shaft part of a blast furnace is larger the nearer the side in the lower part of the furnace, the descending speed v of the charging materials is lower the nearer in the lower part of the shaft part when there is no formation of the materials stuck on the furnace wall and the charging materials descend normally. If the diameter in the mouth part of the furnace is defined as d, the diameter in the belly part of the furnace as D, the length of the shaft as L and the speed at the top end of the shaft as v0, the speed v at the distance x from the top end of the shaft is expressed by the formula. However, if the materials stuck on the furnace wall grow, the sectional area of the blast furnace in said part decreases and the speed v increases. Therefore, if the speed v in the vertical direction from the surface where the charging materials deposit toward the lower part of the furnace is measured successively by a temp. measuring system, and the speed distributions thereof are compared with the speed distributions by the formula, whether the descending conditions of the charging materials is normal or not is easily discriminated. Further, the positions where the materials stuck on the furnace wall are detected as well. |
