Integrated control method and device of production operations of heating furnace and hot rolling of iron and steel enterprise

Abstract

The invention relates to an integrated control method and a device of production operations of a heating furnace and hot rolling of an iron and steel enterprise, belonging to the technical field of iron and steel metallurgy. The integrated control method comprises the following steps: firstly establishing a production operation model of hot rolling and the production operation model of the heating furnace, and utilizing the intelligent optimization algorithm to determine the initial production operations; evaluating and analyzing the obtained production operation schemes; carrying out feedback on the evaluation and analysis results through the closed loop control strategy, amending the production operation schemes, and finally determining the integrated control scheme complying with the conditions of the production operations of the heating furnace and hot rolling process step. The integrated control method adopts the closed loop control strategy for integrating the heating furnace and the hot rolling process step, thereby being capable of avoiding the constrain that the existing method is easy to cause the local optimization to a great extent, also effectively solving the outstanding conflicts and problems in the current actual production and realizing the integrated control and the optimization of production operation plans of the heating furnace and the hot rolling.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an integrated control method and device for heating furnaces and hot rolling production operations in iron and steel enterprises. Background technique [0002] Hot-rolled strip steel is the most important steel product, accounting for more than half of the entire steel product, and is an important factor to measure the development level of a country's steel production. Heating furnace and hot rolling production play an important role in the entire production process of iron and steel enterprises. On the one hand, the hot-rolled coils produced by the hot rolling process can be directly sold as finished products, and on the other hand, they can be used for various production processes in the downstream finishing stage. Provide raw materials. [0003] The production process of the hot rolling mill of the iron and steel enterprise is as follows: figure...

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Problems solved by technology

[0008] In actual production, although multiple heating furnaces are usually used to supply materials to one hot rolling mill, due to the variety of heated slabs, frequent changes in thickness, and large variation range of furnace temperature, the production capacity of heating furnaces in actual production needs Far lower than its designed production capacity, resulting in the production rhythm of the heating furnace not keeping up with the production rhythm of the hot rolling mill, which has become a "bottleneck" process that seriously restricts the increase in production capacity of the hot rolling mill;

[0009] (3) There are many and contradictory production costs and control objectives, making it difficult to make overall plans;

[0010] Numerous production costs need to be considered in the preparation and control of heating furnace and hot rolling production operations, such as slab specification switching costs, energy consumption costs, stacking costs, delayed delivery costs, etc., where the specification switching costs include Width and thickness jumps. In addition, many production control objectives need to be considered, such as the logistics balance of each unit behind the rolling mill, the stacking method of slabs in the intermediate warehouse, the furnace charging method, equipment utilization, and on-time delivery. etc., and these goals are contradictory and conflicting with each other. Therefore, the current artificial method can only focus on a few important production cost and control goals, and often loses sight of the other, and cannot achieve optimal control at the global level;

[0011] There have been many literatures on the preparation and control methods of the production operations of the heating furnace process and the hot rolling process (Cowling P.A flexible decision support system for steel hot rolling mill scheduling[J], Computers & Industrial Engineering, 2003, 45( 2): 307-321; Broughton JS. Optimized scheduling and control of a continuous walking beam reheat furnace via the use of computational intelligence. PhD thesis, Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield (UK), 2003; Broughton JS, MahfoufM, Linkens DA. A paradigm for the scheduling of a continuous walking beam reheat furnace using a modified genetic algorithm [J], Materials and Manufacturing Processes, 2007, 22: 607-614), but these methods are only for the heating furnace process Or the hot rolling process, or the artificial method of simulating them as two mutually independent systems for optimization and control respectively, so these methods cannot be used to solve the main problems existing in the current actual production

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