基于PLC的重介洗选煤控制系统设计_高月华1.doc

河北大学工商学院
装
订
线

本科生毕业论文(设计)
题目:基于PLC的重介洗选煤控制系统设计
学部信息科学与工程学部
学科门类工学
专业电气工程及其自动化
学号 2007482665
姓名杨浩亮
指导教师高月华

2011年5月12日
基于PLC的重介洗选煤控制系统设计
摘要
20世纪90年代以来,伴随着介质旋流器选煤在煤炭分选工艺中地位的上升,世界各个国家在重介选煤工艺、洗煤设备以及其测控系统等方面做出了大量积极的研究和探索。
本文基于PLC适应性强,操作方便,可靠性高等特点,引用模糊控制的思想,设计悬浮液控制系统。本设计的目的是对重介悬浮液液位和密度的控制。本控制系统共有五个模拟输入量和三个数字输出量:给定液位、给定灰分、输入液位、输入灰分、输入密度和主洗开关阀、加介质开关阀和加水开关阀的开启信号。根据给定液位和输入液位比较的结论、给定灰分与输入灰分进行PID运算得到的输出值和给定密度比较的结论,得到三个数据(液位的高低、密度的偏差e、密度偏差的变化量ec)去查询设计的控制查询表,得到输出信号。
关键字:重介旋流器;重介选煤工艺;灰分回控;重介悬浮液
Based on the Dense Medium Coal Cleaning PLC Control System Design
ABSTRACT
Since the 90s of the 20th century , along with the medium cyclone separation process in the status of coal rise, the world in various countries in the heavy medium coal preparation technology, coal washing equipment and the monitoring and control systems has made a lot of active research and exploration.
Based on PLC adaptable, easy operation, high reliability, reference fuzzy control theory, design suspension control system. The purpose of this design is the suspension of liquid and density control. prehensive description of the control system consists of five analog inputs and three digital output: given level, given the ash, the input level, enter the ash, the input density and the main wash off valve, add water, switch the media off valve and processing valve opening signal. According to a given level pare the conclusions of the input level, given the input of ash to ash and operation of the output value of the PID and the conclusions of a given density is to obtain three data (high and low liquid level, density, the deviation e, the density deviation of the change in ec) to the query design control query table, get the output signal.
Key word: cyclone;heavy coal cleaning technology;interface ash back control;heavy medium hydrocyclone
目录
1 绪论 1
课题的来源及意义 1
重介洗选煤的国内外发展情况 1
重介悬浮液的简介 2
本课题的主要工作内容 2
2 重介悬浮液系统的硬件设计与选型 4
重介旋流器 4
重介悬浮液控制系统硬件连接 4
PLC的介绍