模糊PID技术在控制锅炉汽包水位的初探

Exploration of Fuzzy-PID Technology Applied to Water Level Control of Boiler

目前使用的锅炉自动控制水平较低,存在燃烧不彻底、排烟氧含量偏高、排烟热损失大等问题,直接造成了锅炉热效率低下和大量能源的浪费,同时也给环境带来很大的污染,所以完善锅炉的计算机控制具有重要的意义。采用西门子300PLC为开发平台,设计模糊PID控制器应用于锅炉控制系统克服了锅炉控制系统的大惯性、非线性等特点,并结合PID控制稳态精度高的特点,使控制系统有良好的控制效果。在研究模糊控制与传统PID控制相结合的基础上,以锅炉为对象,,设计了一套完善、实用的自动控制系统。

The boiler automatic control level in our company is low now. There are many problems, such as incomplete burning high oxygen content and groat heat loss of exhaust gas. These problems not only results in low boiler thermal efficiency and big waste of energy directly, but also brings about great harm to the surroundings. Therefore, it is importan to perfect the boiler computer control system. Based on Siemens 300PLC platform, Fuzzy-PID controller is designed for the boiler control system in our company to over- come the shortcomings of groat inertia and non-linearity of the boiler control system. The whole control system is made have a good effect in combination with high of steady-state accuracy of PID control.On the basis of combining Fuzzy-PID control with traditional PID control, a complete and practical automatic control system is designed for the boiler in our company.