Design And Research On The Control System For Coke Oven Mechanism

In recent years, the development of multilayer network technology is fast. It is used widely in metallurgy, papermaking, electricity, and other various industries. Good construction of enterprise information system is one of the criteria of enterprise modernization. Thus with multilayer network as hardware design concept realizes automatic acquisition,storage,real-time transmission of the data and it can make and execute each plan automatically, especially the production plan. It can also realize the integration of the production,supply,sale and control of the enterprise. It has become the latest highlights of coke oven machinery system control technology. Otherwise, as the key factor of system control strategy,the fuzzy PID,multi-motor load balance,much core technology on automatic positioning in the process of coke oven machinery system control will play a positive role in production efficiency,environmental protection,safety,accuracy of the equipment.Taking the 7.63 meters coke oven machinery system of Shougang for example.The thesis focuses on how to construct the automation management system of coke oven machinery, realizing the seamless combination of the on-site control layer and the base,process and production management control layer. It also includes several control strategy research and demonstration.In the end, monitoring management man-machine interface system is worked out.The following several aspects are introduced in this thesis: Firstly, in view of the openness,interoperability,reliability,digitization and the production requirements of the coke oven machinery system control, each of the scattered measurement and control equipment are connected together by the way of network nodes, constructing the multilayer network hardware structure. Because the control object of coke oven machinery system are complicated, scattered and fast response, the system designs fully embodies the quickness, expansibility and openness of the network system. In view of the above feasure, this thesis selects the fieldbus, basic automation layer, process automation layer, production control layer, which are multi-layer network control structure of network combining.The production chain management, production project management, equipment of remote set data acquisition and control function are realized in the way of building the network by the fieldbus, Ethernet cable, wireless transmission and process control computer (abbreviation as L2).Secondly, coke oven machinery of industry is a special industry,because of hostile field environments, frequent work and high demand on operation safety and reliability. At the same time, in response to state industrial policies about energy conservation and emission reduction standard of coke oven machinery equipment,various control strategies become the core technology of the system control in the coke oven machinery control system.Those contain the electrohydraulic proportional system for dust emission control, the automatic postioning system for improving the efficiency of production and the load balance for the motor running characteristics of optimization. In view of the above system control requirements, the electrohydraulic proportional valve and fuzzy PID control strategy are used in this thesis.It realized the oil cylinder velocity of real-time control, so as to ensure the door extractor retract, forward and raise, tilt on the smooth running well and quichly.It not only eased the impact of equipment, but also played good sealed box on the furnace door and furnace frame. The multi- motor driving load balance control system are established by using SIMOLINK ring network and the frequency vector control. It solved better the practical problems of big current deviation, which caused by uneven load distribution of coke oven machinery. And the driving multi-motor load realized automation and real-time evenly distribution. The distortion and run badly of the steel structure on control are solved, and the high-speed and smooth operation of equipment are realized, thus the production efficiency are improved. Automatic positioning technology using coding system, can set vehicles equipment with accurate positioning in objective place according to the S curve in procedures. It not only met the control requirements of positioning error less than 5mm or equal to 5mm,but also had a smooth effect on operation control, especially played a crucial role in control for the equipment interlocking operate safely.Finally, based on the compact structure, poor visibility,much control object,high request on safe operation, and centralized management of the coke oven machinery equipment, the monitor management system is taked into the control system. It realized the on-line detection, real-time analysis and the trend diagnosis of the control system operation and operation parameters. It can also find and forecast abnormal operation, and provide fault handling information.The monitoring system in this thesis, can guide operation personnel to operate the system reasonable, ensure the safety of system operation, especially provide good interface functions on raise the level of production management.In August 2008, the 7.63 meters coke oven machinery project of Shougang, which based on the network structure, control strategy, monitoring and management system, was operated successfully.