基于稳态模型的加热炉烟风系统控制  

Control of flue gas-air system for fired heaters based on steady state model

作　　者：张伟勇[1] 李映[1] 黄德先[1] 伊佳 张志印 杨向党 

机构地区：[1]清华大学自动化系,信息科学与技术国家实验室,北京100084 [2]中国石油华北石化公司,河北任丘062552

出　　处：《浙江大学学报（工学版）》2011年第12期2093-2098,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(60974008);国家“863”高技术研究发展计划资助项目(2007AA04Z193)

摘　　要：由于加热炉烟风系统风量调节执行机构存在较严重的非线性、灵敏度差、变量间强耦合,基于动态的控制系统稳定性和安全性很难得到保障,为此提出采用稳态模型的烟风系统控制方法.利用该模型直接计算出调节量并送至执行机构进行调节,在等待一个稳态响应时间后,如果未能达到控制目标则根据稳定后的调整结果再进行下一次调节.给出了算法收敛的充分条件.该烟风系统控制方法避免了频繁调节所带来的安全隐患,克服了动态反馈控制存在的稳定性难题.将该方法应用于氧含量和负压的控制,实现了加热炉的整体自动控制.仿真研究和现场应用表明,控制效果良好,为加热炉的安全、平稳运行创造了条件,并为进一步的热效率优化提供了基础.Due to the difficulties in the control of flue gas-air system of fired heater, such as severe nonlinearities, low sensitiveness to control signal which exists widely in the actuators, and high coupling of process variables, it＇s not easy to guarantee stability and safety by the dynamic control method. A control strategy adopting steady state model was proposed. The steady state model directly calculates the control move and implements it. Then the controller waits one settling time, and the next control move is calculated using the steady state feedback information if necessary. A sufficient condition for convergence was proved. The method avoids the potential dangerous caused by high frequency adjustment and provides stable control. Automatic control for the whole fired heater unit was achieved by applying the control strategy to the chamber oxygen content and pressure control. Simulation and industrial application show that the control performance is satisfactory. The strategy provides a basis for safe and smooth operation, and further thermal efficiency optimization.

关 键 词：加热炉 烟风系统 稳态模型 氧含量控制 负压控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]