Research on scheduling method of steelmaking-continuous casting production with limited waiting time and stage skipping

In the process of steel smelting, there are restrictions such as different refining processes and variable equipment transportation time. The existing steelmaking-continuous casting production scheduling methods are mainly for the simple production modeling and analysis, which are difficult to effectively solve the practical problems. In this paper, an optimal scheduling mathematical model is constructed for the problems of different refining stage paths and equipment transportation time between adjacent charges in a large domestic steelmaking plant. On the basis of this model, a composite method is proposed for the problems of different refining stages, charge transportation waiting time and the continuous casting process without waiting time. Comparing with simulated annealing (SA), particle swarm optimization (PSO) and the proposed composite method, experiments show that the composite Forward-Reverse method can avoid waiting time, ensure no overlap in the process, and obtain the minimized legal scheduling results in the case of stage skipping.