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针对在烟叶复烤的生产过程中,存在出口含水率控制精度不足和因调节阀达到饱和而失去调节作用的问题,设计一种可以控制多个操纵变量的三重控制方案.由于回潮室高压泵频率调节对出口水分的影响最快速、最直接,故作为主控制器的控制对象,主要采用预测PI(proportional-integral)控制算法.由于混合水调节主要影响整个回潮室的湿度场,调节相对缓慢,故作为副控制器1控制对象,主要采用PI控制算法.为了防止高压泵开度和混合水调节阀达到饱和,副控制器2以冷房含水率设定值为控制对象,间接影响出口水分含量.实际运行结果表明,该控制算法能够精确控制出口含水率精度,并及时协调各调节阀的开度.这为工业生产提供了新的控制思路,提高了整个生产线的自动化程度,具有很大的工业应用价值.
Aiming at the problem that the control precision of the outlet moisture content is not enough and the control valve loses its regulating effect due to the saturation of the control valve in the process of the redrying of the tobacco leaf, a triple control scheme capable of controlling a plurality of manipulated variables is designed. As the control object of the main controller, the predominant PI (proportional-integral) control algorithm is adopted.As the mixed water regulation mainly affects the humidity field of the whole regurgitation chamber, the regulation is relatively slow, Therefore, as the control object of the sub-controller 1, the PI control algorithm is mainly adopted.In order to prevent the opening of the high-pressure pump and the saturation of the mixing water control valve, the sub-controller 2 takes the set value of the moisture content of the cold room as the control object and indirectly affects the moisture content of the outlet. The actual operation results show that the control algorithm can accurately control the accuracy of outlet moisture content and coordinate the opening of each regulating valve in time.This provides a new control idea for industrial production and improves the automation of the whole production line, Value.