关键词: 钢铁一体化生产, 合同计划, 热装比, 遗传算法, 双层染色体

Abstract: A production order planning optimization model is developed for the integrated steelmaking-continuous casting-hot rolling-final finish (SM-CC-HR-FF) process in a steel plant, where the steelmaking and hot rolling are regarded as the key steps. The objectives are to maximize the hot charging proportion of slabs and minimize the early/delayed delivery time and the slabs which are surplus to the requirements for hot/rolling. The main constraints including steelmaking and hot rolling capacities, steel grade and slab and product dimensions are all taken into consideration in the model. A two-level chromosomes genetic algorithm is designed to solve the model. At the order planning level, the problem how to match the steel grade and dimensions during continuous casting with those during hot rolling in the integrated process of steel production is solved. Then, the order plan thus obtained becomes the reasonable production order pool by which both the batch planning and static scheduling of integrated steel production are available. A simulation example shows the reasonability of the model and validity of the algorithm.