高健步进梁加热炉炉温控制与优化.doc

步进梁加热炉炉温控制及优化 摘要 加热炉是轧钢生产线上的重要设备之一，也是钢铁工业中的耗能大户。随着现代化轧机向连续、大型、高速、高精度和多品种方向发展，对冶金加热炉的模型研究和优化控制提出了越来越高的要求。但由于加热炉是一个典型的复杂工业被控对象，它具有多变量、时变、非线性、强耦合、大惯性和纯滞后等特点，而且炉内钢温分布不能直接测量、外界扰动因素多，加热过程受多种生产工艺因素的制约。所以总的来说，加热炉的高级计算机控制策略还不成熟，真正具有成功应用的并不多见。加热炉控制的目的是按照轧机轧制节奏，设定加热炉区段炉温，使板坯在炉内充分受热，在板坯出炉时其出炉温度和均热度满足轧制要求，同时要使所消耗的燃料尽量小。目前通常是通过控制加热炉区段炉温来达到控制加热炉内板坯温度的目的。本文主要是围绕加热炉炉温优化设定及其控制展开了一些研究 。对加热炉的控制现状进行了系统的归纳、分析和总结。提出一种基于前馈补偿的加热炉炉温设定值的动态优化控制策略。运用复杂大系统中的分解与协调思想将加热炉分成串联的子系统，将前一子系统的输出看成当前子系统的可测扰动，运用多前馈—反馈的预测控制对加热炉炉温进行控制。 关键词: 加热炉；设定值优化；前馈补偿；炉温控制 Control and Optimization of walking-beam Reheating Furnace Abstract Reheating furnace is one of the most important facilities in steel rolling，and consumes great amount of energy. Modern rolling mills are developing to be continuous，large-scale，fast produce，high quality ,which deliver a higher demand for the research of reheating furnace modeling and optimal control. However，the advanced computer control theory of reheating furnace is still far from mature . This is because that reheating furnace is a typical complicated industry system . Complex thermodynamic，chemical and physical change makes it a system with multi- variable，time variety，non-linearity , strong coupling，pure time delay and a lot of disturbance factor. The aim of reheating furnace control is to set optimal. Temperature of reheating furnace and make the billet to be heated adequately. At the same time，it must to be ensured the consumption of fuel to be as less as possible. At present，the way to control the temperature of billet is to control the furnace temperature. Aiming at the fact that large-scale feedback system cannot reflect the change of work condition in time，the research of this paper focuses on reheating furnace set point optimization，and proposes a new feed—forward compensation method .The control status quo of reheat furnaces is systematically summarized and analyzed. A feed-forward compensation based dynamical optimal control method of set points of reheating fu