本文選題：重介質(zhì)選煤　切入點：PLC　出處：《內(nèi)蒙古科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：為了滿足工業(yè)用煤對煤炭品質(zhì)的要求，重介質(zhì)選煤技術以其極易操作和高效率的特性大受歡迎。在選煤廠自動化方面進展也較快，多數(shù)選煤廠實現(xiàn)了集中控制，其中部分選煤廠完善了檢測和監(jiān)控管理系統(tǒng)，實現(xiàn)對全廠設備運行條件下的狀態(tài)采集顯示、設備故障報警、數(shù)據(jù)存儲等，供集控室人員查閱歷史資料以及實時監(jiān)控；相當一部分選煤廠使用了工業(yè)電視，對主要設備的運行進行監(jiān)視。重介質(zhì)選煤技術以其極易操作和高效率的特性大受歡迎。 本文以年處理原煤能力300萬噸/年的選煤廠集控系統(tǒng)設計為背景，深入介紹了重介質(zhì)選煤工藝的要求以及各種重要工藝參數(shù)研究，在我國重介選煤工藝參數(shù)的自動控制算法一般采用經(jīng)典控制，甚至是人工控制的方式，在實際應用中工藝參數(shù)控制精度不高，在工礦發(fā)生變化時密度、磁性物含量和精煤灰分均成波浪線性變化，因此系統(tǒng)的數(shù)學模型很難建立。為此，本文采用重介懸浮液密度模糊控制的方法。根據(jù)參數(shù)之間動態(tài)變化，對模糊控制器進行設計，采用PID控制器對參數(shù)進行整定，得出合適的PID參數(shù)，設定密度值，對實際密度進行調(diào)節(jié)。 按照選煤廠的工藝與控制要求，分析控制系統(tǒng)總體框架，充分考慮設備先進性、生產(chǎn)安全性和操作靈活性。采用CRT+PLC的方式，由兩臺工控機和一套PLC構(gòu)成。參加集控的設備按系統(tǒng)有集控和就地兩種操作方式，在集控方式下，，分為自動和手動方式。硬件配置方面，下位機選用西門子S7-300CPU315-2DP PLC，采用西門子編程軟件STEP7進行程序的編寫，實現(xiàn)實時數(shù)據(jù)的采集、轉(zhuǎn)換、電氣設備的控制等功能。上位機選用與西門子配套的SIMATIC WinCC組態(tài)軟件，設計選煤廠組態(tài)畫面實現(xiàn)選煤廠各個設備遠程開車、停車和急停功能，對整個系統(tǒng)進行遠程實時監(jiān)控、參數(shù)設置、報警指示、歷史曲線等功能。上位機與下位機采用工業(yè)以太網(wǎng)進行通訊連接，PLC主站與分站之間采用PROFIBUS-DP網(wǎng)絡進行通訊連接。最后完成整個控制系統(tǒng)的設計，滿足選煤廠的監(jiān)測、集控及管理等要求。
[Abstract]:In order to meet the requirement of coal quality for industrial coal, heavy medium coal preparation technology is popular for its easy operation and high efficiency. The automation of coal preparation plants is also developing rapidly, and most coal preparation plants have realized centralized control. Some of the coal preparation plants have improved the detection and monitoring management system to realize the status acquisition and display equipment fault alarm data storage and so on under the operation condition of the whole plant. A considerable number of coal preparation plants use industrial television to monitor the operation of major equipment. Heavy medium coal preparation technology is very popular for its easy operation and high efficiency. Based on the design of centralized control system of coal preparation plant with annual raw coal treatment capacity of 3 million tons per year, the requirements of heavy medium coal preparation process and the study of various important technological parameters are introduced in this paper. In our country, the automatic control algorithm of heavy medium coal preparation process parameters generally adopts classical control or even manual control. In practical application, the control precision of process parameters is not high, and the density of the process parameters is not high when the industrial mines change. The magnetic content and ash content of clean coal change linearly, so it is difficult to establish the mathematical model of the system. In this paper, the fuzzy controller is designed according to the dynamic change of parameters by using the fuzzy control method of the density of heavy medium suspensions. The PID controller is used to adjust the parameters, the appropriate PID parameters are obtained, the density values are set, and the actual density is adjusted. According to the process and control requirements of the coal preparation plant, the overall frame of the control system is analyzed, and the advanced equipment, production safety and operation flexibility are fully considered. The mode of CRT PLC is adopted. It consists of two industrial control computers and a set of PLC. The equipment participating in the centralized control system is divided into automatic and manual mode according to the two operation modes of centralized control and local control. Siemens S7-300 CPU315-2DP PLC is used in the lower computer, and Siemens programming software STEP7 is used to compile the program to realize the functions of real-time data acquisition, conversion, electrical equipment control and so on. The upper computer selects the SIMATIC WinCC configuration software matching with Siemens. The configuration picture of the coal preparation plant is designed to realize the functions of remote starting, stopping and stopping of every equipment in the coal preparation plant, remote real-time monitoring, parameter setting and alarm indication of the whole system. History curve and other functions. The upper computer and the lower computer use industrial Ethernet to communicate and connect the main station and the sub-station. Finally, the design of the whole control system is completed to meet the monitoring of the coal preparation plant. Centralized control and management requirements.
【學位授予單位】：內(nèi)蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD94

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