基于可行工况集的带钢连续热处理过程优化策略

Optimization strategies of steel strip continuous heat treatment based on feasible sets

在带钢连续热处理热过程机理数学模型的基础上,提出了带钢连续热处理过程中的稳定工况和变工况过程的优化策略.根据稳定工况过程的启发式优化策略,得到了各钢簇(由钢种、规格确定)的可行工况集,基于各钢簇可行工况集之间的关系,研究开发了变工况条件下带钢连续热处理过程优化控制策略.该策略通过调整机组的操作参数,使得带钢温度与热处理目标温度之间的误差最小.通过对现场实际采用的变工况控制策略与本文开发的策略的对比分析表明,基于可行工况集的变工况策略可以在更短时间内实现变工况过程,更精准地控制变工况期间的带钢温度.

Based on the heat transfer model, optimization strategies were proposed for the steady and transition operating modes during steel strip continuous heat treatment processes. Feasible sets for every steel group （classed by steel grade and size） can be obtained by a heuristic optimization strategy in the steady operating mode. Based on the relations of feasible sets of different steel groups, an optimization strategy for the transition operating mode was developed, which minimized the differences between the steel strip temperature and target temperature of heat treatment by the adjustment of operating parameters. A comparison between the control strategy used in steelmaking plants and the new developed shows that the optimization strategy based on feasible sets can fulfill the transition operating mode more rapidly and control the temperature of steel strips more accurately.