Analysis of Steel Scrap Preheating Process by Recovery of Waste Heat in Continuous Casting

摘要

A method for preheating steel scraps using waste heat in a continuous casting process was proposed. Experiment and numerical analysis were carried out to examine the ability of scrap preheating and to determine the factors affecting the rise in scrap temperature. The commercial FEM software ANSYS was used for simulation of temperature distributions in the scrap. The simulated results agreed well to the experimental ones with the emissivities of heat source and samples of 0.85 and 0.65, respectively. The thickness (H_s) of the scrap sample and the distance (D) between the heat source and sample were found to affect the rise in sample temperature largely. The overall heat transfer can be given by the following dimensionless relation: Nu_o = [(5.505D*H*~(0.75) - 0.403)Ra~(0.18)t*~(-1) - 26.21(D*H*)~(1/3) + 9.96] X (1 + 0.268D*~(-2.19)H*~(-0.73)) A higher preheating efficiency is anticipatable to combine the proposed method with the conventional ways of scrap preheat using waste gas.