The Application Of PLC In Coal Preparation Plant

Energy industry is the key to economic development in our country, in recent years, with the oil resource insecurity, the oil price has soared, the importance of coal industry and irreplaceable also increasingly protruding shows. The traditional coal transfer system is based on a relay and contactor and manual half-automation system, the scene environment is very harsh, often have the deviation of the belt, belt tearing failure occurs. In order to ensure that industrial coal, coal preparation system must always be in good condition. With the rapid expansion of demand for coal, coal preparation system played an increasingly prominent role, while the traditional coal preparation system has been unable to meet the needs, so the need for traditional coal preparation system transformation.At present, in the field of industrial control PLC and PC configuration application and communication is a hot technology, with the programmable controller (PLC) technology development, due to its high reliability, high cost performance, wide adaptability and convenient process for industrial field extended performance, PLC in the industrial process automation has been more applications.This article is in this background, from the basic structure of PLC proceed with, and the PLC control system general design methods and to improve the reliability of the system some basic measures of application has been tried, focusing on the PLC control system hardware, software design methods, combining the actual situation of site design the whole system design scheme, using the Germany Siemens company’s S7--300series PLC, application and matching STEP7programming software, can reliably, accurately control operation, real-time monitoring and recording of coal conveying process operation condition, and be able to present all kinds of emergency events response time, realize the entire production, coal, coal handling system of the full automatic control, thereby improving device the reliability and automation degree. At the same time the use of Siemens configuration software, WinCC design of PC control system, realize data real-time recording and monitoring, and has the record inquiry, alarm, redundancy and network release function. The main contents are as follows:Firstly, this paper introduces the Chinese coal industry’s basic situation, the current main existing coal into the wash rate is insufficient, industrial coal containing ash, sulfur content is high, and the problem such as difference of coal preparation equipment level; elaborated in the application of centralized control system in coal preparation plant of necessity, describes the PLC control system for coal preparation plant each link of production brought about a significant change; points out the source of the subject and research of Jining mi ning group canal coal preparation plant project general situation, introduced the coal preparat ion plant of the non pressure three products heavy medium coal preparation processSecondly, the paper illustrates the control system of coal preparation plant design of the main train of thought and content, detai Is about the project to achieve the overall goal and will meet the requirements for each subsystem, the delineation of the scope of the project, introduced the computer system network structure and monitoring system of the functional requirements, list the overall system control framework.Once again, the detailed explanation of the centralized control system of coal preparation plant hardware research and design, illustrated by the Siemens company S7-300series PLC several main function modules and related principles, make each subsystem of the I/O list, and respectively introduced their system PLC detailed configuration and a portion of the device control principle graph and the external wiring diagram, and illustrates the control system of coal preparation plant by monitoring the temperature, liquid level, pressure and other parameters related content.Then, to talk about with Siemens company S7--300series PLC matching STEP7programming software, the software can reliab]y, accurately control operation, real-time monitoring and recording of coal conveying process operation condition, and be able to present all kinds of emergency events response time, the set of production, coal, coal handling system of the full automatic monitoring, in order to improve equipment reliability and automation degree. At the same time systems using Siemens company configuration software WinCC computer moni tor ing system, real ize data real-time recording and monitoring, and has the record inquiry, alarm, redundancy and network release function.Finally, further description of the project of computer management information system design, introduced the control system to the external device; summarized the topic discussion. The authors illustrate ways in which the shortage of the work, pointed oul the following work efforts should be made to enhance and improve local.