基于模糊PID控制的选煤自动控制技术研究

Research on Automatic Control Technology of Coal Preparation Based on Fuzzy PID Control

选煤自动控制过程中介质的流动稳定性会直接影响液位和密度的测量精度,导致选煤自动控制的精度较差。为了提升油位、密度和灰分含量控制效果,提高选煤的质量,提出基于模糊PID控制的选煤自动控制技术。首先,采用PLC技术设计了选煤生产线架构,分析了选煤生产线的物理特性和信息输出特性;其次,建立选煤系统的数学模型,分析煤炭质量效果与介质液位与密度之间的关系;最后,设计了模糊PID控制器,将介质液位与密度的误差以及误差变化率输入模糊PID控制器中,实现选煤的自动控制。实验结果表明,所提方法可有效控制介质的液位与密度,输出的煤炭灰分含量为设定的最优值,具有良好的控制效果。

The flow stability of the medium in the process of coal selection automatic control directly affects the measurement accuracy of liquid level and density,resulting in poor accuracy of coal selection automatic control.In order to improve the control effect of oil level,density,and ash content,and improve the quality of coal preparation,a coal preparation automatic control technology based on fuzzy PID control is proposed.Firstly,the architecture of the coal preparation production line was designed using PLC technology,and the physical characteristics and information output characteristics of the coal preparation production line were analyzed.Secondly,establish a mathematical model of the coal preparation system and analyze the relationship between the coal quality effect and the liquid level and density of the medium.Finally,a fuzzy PID controller was designed to input the error between medium level and density,as well as the error change rate,into the fuzzy PID controller to achieve automatic control of coal selection.The experimental results show that the proposed method can effectively control the liquid level and density of the medium,and the output coal ash content is the set optimal value,with good control effect.