The Spherical Ingot Model and Its Application to Control of the Soaking Pit,

摘要

Results are presented of a modeling study of ingot processing as well as thermal control of the soaking pit operation. This research was done to develop a practical prediction model which is both operational and useful to people in the steel industry who are concerned with ingot processing. The modeling of ingot processing was accomplished by use of the thermal ingot model developed by Maeda. Maeda modeled the ingot by use of a spherical model of the real ingot. Maeda's model greatly simplified the problem by reducing the three-dimensional ingot to a sphere with only one independent spatial variable,the radius. This spherical model is used throughout this thesis to model ingot processing and to develop a soaking pit control algorithm. Research objectives were to: (1) study and verify the Maeda spherical model; (2) adjust or revise the spherical model to better represent ingot processing; (3) simplify the mathematics of the spherical model for better adaptation to use with on-line computers; (4) investigate fuel optimal ingot heating;and (5) develop a practical control algorithm for the soaking pit operation. A large portion of the text includes graphic and tabular material. (Portions of this document are not fully legible)