Steelmaking plants usually do not have many types of equipment, but the preparation of plans is not simple, mainly because the switching of products of various specifications is very complicated.
The following are the main production processes of a steelmaking plant:
Ironmaking -> Desulphurization -> Vanadium extraction -> Steelmaking and feeding -> Refining -> Pouring -> Rolling
Ironmaking desulfurization and vanadium extraction:
The materials for these processes are all iron, and there is no difference in raw materials. There are several main points to consider when scheduling:
Since the size of the iron-making furnaces in each process is different, the production time of each furnace is also different. When scheduling, the matching of time and capacity of the furnaces of the process must be considered to ensure the continuity of production.
Added steelmaking/refining:
Different materials are added to the molten iron to become different steel materials, such as high carbon, low carbon, various stainless steels, etc. Key points of steelmaking production scheduling:
Arrange the production of each heat according to the principle of temperature gradient to meet the order requirements at the same time
Pouring/rolling:
Divided into hot rolling and cold rolling. Hot rolling directly receives the molten steel produced by steelmaking. When scheduling, the appearance size and material of the product are mainly considered, such as the width of the slab, the length and width of the steel column, the diameter of the steel pipe, etc., so that various specifications can be continuously changed slowly, in increments Or decreasing emissions. In addition, the output plan must match the output speed of molten steel.
Cold rolling uses plates that have been put into storage, and production plans use inventory. When scheduling, we mainly consider the order delivery date, rolling temperature and specifications of various products, so that the temperature changes steadily and the specifications change slowly and continuously to meet the order delivery date.
PlanMateAPS solution:
Set various constraints and scheduling rules for production scheduling, and PlanMateAPS can automatically schedule. Due to the complexity of steelmaking scheduling, planner experience is also important. The visual Gantt system of PlanMateAPS allows planners to comprehensively view and analyze the production plan, repeatedly optimize and adjust it, and add their own experience to the system to optimize the production plan.