Multi-Time Scale Analysis of The Influence of Blast Furnace Operations on Permeability Index

In the smelting process of a blast furnace (BF), BF operations can regulate the permeability index (PI), but different operations affect the PI on different time scales. Aiming at the problem that BF operations have multi-time-scale effects on the PI, this paper uses a multi-time scale method to analyze the influence of each operation on PI at different time scales. First, the influence of BF operations on the PI is analyzed through the ironmaking mechanism, and three mechanism chains of BF operations affecting the PI were obtained. On this basis, the time scale of the mechanism chains is distinguished. Then, a cross-correlation analysis is used to calculate the time-delay relationship between each operation and the PI. Finally, the influence of different operation parameters on the PI is verified by real-world production data, and the multi-time scale characteristics of the influence of BF operations on the PI are proved.