基于PLC和HMI的蓄热式锻造加热炉过程控制系统设计  

Design of Process Control System for Thermal Storage Heating Furnace Based on PLC and HMI

作　　者：李剑 王皖君[2] LI Jian;WANG Wanjun(Nanjing Science and Technology Career Academy, Nanjing 210048, China;School of Mechatronics Engineering, Nanjing Forestry University, Nanjing 210000, China)

机构地区：[1]南京科技职业学院,江苏南京210048 [2]南京林业大学机械电子工程学院,江苏南京210000

出　　处：《热加工工艺》2018年第11期163-165,169,共4页Hot Working Technology

摘　　要：蓄热式锻造加热炉存在烟气热回收效率低、节能效果差等问题。在蓄热炉原理分析的基础上,确定了以模糊控制预热温度和气体流量的蓄热过程优化控制方案。硬件设计采用S7-300 PLC,开发出了易于操作的人机界面（HMI）,实现了对蓄热过程温度、流量的在线监控。通过软件优化了蓄热过程换向阀动作时序,利用气体流量反馈和模糊推理控制了预热和排烟温度。结果表明,排烟和预热温度基本满足优化设计要求,排除烟气温度≤180℃,预热温度≥1000℃,有效降低了蓄热式加热炉能耗。The thermal storage forging heating furnace has problems such as low efficiency of flue gas heat recovery and poor energy saving effect. On the basis of the principle analysis of the regenerative furnace, the optimization control scheme of the heat storage process with fuzzy control of preheating temperature and gas flow was determined. The hardware design uses S7-300 PLC（programmable logic controller）, an easy-to-operate man-machine interface（HMI） was developed and the on-line monitoring of temperature and flow in the process of thermal storage was realized. The timing sequence of reversing valve in regenerative process was optimized by software. Preheating and exhaust gas temperatures were controlled by gas flow feedback and fuzzy inference. The results show that the exhaust gas and preheating temperatures basically meet the requirements of the optimization design with exhaust gas temperature ≤180℃ and preheating temperature ≥1000℃, and it effectively reduces the energy consumption of thermal storage heating furnace.

关 键 词：蓄热式加热炉 温度 模糊控制 PLC(可编程逻辑控制器) 节能 

分 类 号：TG307[金属学及工艺—金属压力加工]