退火炉温度控制系统的大林控制策略研究毕业设计.doc

摘 要 本文以煤气罩式退火炉为主要研究对象，对罩式退火炉的大滞后性制作了系统的研究。退火炉是对冷轧钢板进行热处理的重要热力设备，在工业生产的各个领域也得到了广泛的应用。 退火炉中温度参数的控制具有惯性大，而且升高速度很快的特点。炉内部通过空气和煤气的混合气体燃烧产生的热来维持系统的升温和保温。炉内降温则是通过在空气中自然冷却来完成。退火炉的温度参数一旦超调就无法使用控制算法来控制。因此，超调量的控制是主要任务。过大的超调量会导致系统不稳定，安全隐患大，钢卷废品率高，所以对于此类的工业控制对象采用传统的PID调节器进行控制很难保证小超调或无超调，系统的振荡会严重影响产品质量。 针对退火炉的大滞后一阶惯性特点，本文介绍了一种很好的控制算法——大林控制算法。大林控制器在针对具有纯滞后、大延迟的被控对象具有良好的控制效果，采用大林算法的意义在于大林控制算法能在一些具有纯滞后环节的系统中兼顾动静两方面的性能，控制效果比较理想。大林控制器已经在工程中得到了广泛的应用大林算法的设计目标是选择适当的数字调节器, 从而使得闭环系统的调节品质满足工艺要求。不同于传统的PID调节，由于大林控制器对系统的要求有严格的限制,系统中不存在超调量。 关键词：煤气罩式退火炉 纯延迟 大林算法 Abstract This article uses gas hood-type annealing furnace as the main object of study, and makes a systematic research for large lag of the hood-type annealing furnace. Annealing furnace, which is the important thermal equipment acting on heat-treating cold-rolled steel sheet, has also been widely used in all areas of industrial production. The control of the temperature parameter in annealing furnace endows with large inertia and fast increasing. To maintain the heating and insulation of the system, the internal furnace need burn the combined air and gas. Cooling is completed by the natural cooling in the air. In case the temperature parameter overshoots, the control algorithm will fail. So the control of overshoot is the primary task. Overshoot can induce system instability, great hidden danger, high defective index of the tape. For this kind of industry control, it is difficult to guarantee little overshoot or no overshoot by traditional PID controller. The system instability can knock the product quality. To deal with the large time delay and one-order inertia of the hood-type annealing furnace, we introduce an excellent control method –Dahlin algorithm in this article. Dahlin controller can get good effect when it is used to handle pure-time delay and large time delay controlled objects. The Dahlin algorithm can get not only good static performance but also dynamic performance in some systems which have some pure-time