基于PLC的锅炉燃烧控制系统设计-10外文文献原文.doc

PAGE PAGE 9 Boiler level control system based on ControlLogix5550 PLC Abstract-This paper is a research design based on EFPT process control device. In the design, actual industry field has been simulated and corresponding modeling has been carried on for the boiler level system. Then the appropriate PID parameter has been sorted out and ControlLogia5550PLC has been used to control the entire boiler level system. At last, a corresponding control interface has been established and the boiler level has been under a safe and accurate control Keywords：EFPT，PID，Modeling，Boiler level; 1 Introduction The task of the industrial boiler level control is to maintain a dynamic balance by controlling the water flow and evaporation, so that the drum level can be maintained in the technological level, which is a necessity for ensuring safe operation and also one of the main indicators of the boilers normal operation. Water level which is too high will affect the effect of the steam-water separation, but too low it is will break ring cycle or even cause boiler explosion. To ensure a safe and efficient production, the boiler level must be strictly controlled in maintaining constant or changing only according to a certain rule. Using Logix5550 PLC with analogy I/O modules, launched by Rockwell Automation Company as controllers, and EFPT process control experimental device as control object, this system have brought the boiler water level under an accurate control in a mini boiler system with sensors and actuators that used in industrial production. Fig. 1 Boiler level setting value adjustment system 2 System Overview This system is composed of an EFPT process control device, an inverter, a Logix5550 PLC and a computer. EFPT process control device is a simulated heating and water supply and drainage system for a micro-small boiler. It realizes process control in a mini boiler system with sensors and actuators used in industrial production. The actuator inclu