Research And Application Of Centralized Control System In Coal Preparation Plant

With the coal consumers' higher demands to coal quality and categories,coal washing is becoming more important.Developing coal washing is beneficial to the conversion of coal product from single structure and low quality to multi-variety and high quality,realizing product quality.At the same time,the improvement of coal washing technique can enhance the coal quality and utilization,as well as save energy.This paper first introduces the development situation of coal washing domestic and overseas,analyzes the problems exciting in the coal industry of China and clarifies the realistic significance of designing PLC monitoring system in the coal preparation plant;and analyzes the specific coal preparation process and equipment of Lijiahao coal preparation plant,and combined with the process,main equipment and equipment connection relationship of Lijiahao Coal Preparation Plant,then the paper puts forward the requirement of centralized control for coal preparation plant.Next,the paper analyzes electrical control schematic diagram on-site coal preparation equipment,according to the require control amount of the on-site equipment,the I/O points are calculated.According to the sum of I/O points of on-site equipment and specific requirements to the coal preparation technique,the PLC hardware was selected,and a set of coal preparation plant control system with Rockwell AB PLC as the controller was designed to control the field equipment.And the overall framework for PLC monitoring system in the coal preparation plant is constructed,and the design for communication network among various PLC control system is accomplished.The software programming of control system is implemented in RSLogix5000 software programming.At last,the host computer monitoring system of the coal preparation plant was designed,the communication between configuration software and the PLC was realized,and the Internet around the whole plant was built up,thus establishing the monitoring system of coal preparation plant.Since the successful operation of centralized control system in Lijiahao coal preparation plant,there were obviously promotion in the level of production and management.The real-time operating time and history data of production equipment could be seen at any time.The dynamic managements of the coal preparation process parameters was achieved;the accidents and the accident detection and maintenance was lowed;the losses brought by production shutdowns and was lowed;the financial losses caused by wrong decisionmaking was lowered;labor capacity of the entire plant was reduced and the production efficiency was improved.