黄陵二矿选煤厂重悬浮液自控系统技术改造

发布时间：2018-10-23 20:09

【摘要】：本次选题是对黄陵二号煤矿选煤厂的重介悬浮液PLC控制系统的改造。目前,重介悬浮液的电气控制系统经多年发展已日趋成熟,从传统的控制仪表控制,过渡到PLC控制。本文开发了一种同时控制悬浮液的密度和磁性物含量的PLC控制系统,对于提高产品合格率和降低生产成本具有重要意义。本文对悬浮液控制过程中涉及到多个变量进行分析,对密度和磁性物含量对应变量进行分析处理,采用密度控制只依靠补水、磁性物控制只依靠分流的方法,使悬浮液的控制难度降低,悬浮液的波动范围变小。分析了当前各种选煤厂悬浮液控制系统的硬件功能与优缺点,结合现场实际,并考虑经济投入,做出悬浮液控制系统的硬件设计。对密度和磁性物两个变量的PID算法控制进行深入分析,整定PID参数时考虑到控制对象的动态特性,没有采用微分算法,实际采用PI控制律。根据现场工艺和工人经验,给出控制调节过程中P、I值。程序设计简单,程序界面友好、易于操作。经过现场六个月工业实验,所改造的悬浮液PLC控制系统,能够按照要求正常运行,产品合格率由85%提高到98%,生产成本降低80多万元。
[Abstract]:This topic is to transform the PLC control system of heavy medium suspension in Huangling No. 2 Coal preparation Plant. At present, the electrical control system of heavy medium suspension has matured gradually after many years of development, from traditional control instrument control to PLC control. In this paper, a PLC control system is developed to control the density and magnetic content of suspension simultaneously. It is of great significance to improve the qualified rate of the product and reduce the production cost. In this paper, several variables are analyzed in the process of suspension control, and the corresponding variables of density and magnetic content are analyzed and treated. The difficulty of suspension control is reduced, and the fluctuation range of suspension becomes smaller. The hardware functions, advantages and disadvantages of the suspension control system in various coal preparation plants are analyzed. The hardware design of the suspension control system is made by combining the field practice and considering the economic input. The PID algorithm control of density and magnetic variables is deeply analyzed. The dynamic characteristics of the control object are taken into account in the tuning of PID parameters. The differential algorithm is not used, but the PI control law is used in practice. According to the field process and worker's experience, the value of PU I in the process of control regulation is given. The program is simple in design, friendly in interface and easy to operate. After six months of industrial experiment, the modified suspension PLC control system can run normally according to the requirements, the qualified rate of the product is increased from 85% to 98%, and the production cost is reduced by more than 800,000 yuan.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TP273

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