SCR脱硝系统的多变量约束预测控制方法研究与应用

发布时间：2018-03-08 04:14

本文选题：SCR脱硝　切入点：多变量约束　出处：《东南大学》2016年硕士论文　论文类型：学位论文

【摘要】：近年来,随着国家对燃煤电厂污染物排放标准的日趋严格,对燃煤电厂SCR脱硝系统的控制显得尤为重要。SCR脱硝系统是一个典型的大延迟、大惯性对象,有一定的非线性,存在输入输出约束,传统的控制方式在新的排放标准下往往难以取得满意的控制效果,因此需要研究新型的控制策略。模型预测控制能够根据历史信息预测系统未来的输出,对大惯性对象具有一定的控制能力,能够处理控制过程中普遍存在的约束,因此,在SCR脱硝系统的控制中具有广阔的应用前景。本文首先基于SCR脱硝实际对象的特殊性(SCR反应器一般包含A、B两侧)以及国家对燃煤电厂NOx考核的方式(考核点在烟囱入口处)设计多变量控制系统,针对SCR脱硝系统普遍存在的约束,给出了相应的约束求解方法,并将区间控制的思想引入到预测控制中,证明了控制算法的有效性和优越性；其次在保留两侧喷氨阀门协调控制和区间控制优点基础上,针对控制过程中出现的模型失配研究基于Laguerre模型的SCR脱硝系统自适应预测控制方法,通过仿真测试可以看到该算法能更好的适应模型变化；最后基于MATLAB软件与C++语言平台设计开发脱硝系统优化控制软件,投入到现场运行,分析其控制效果,并针对问题提供了相应的解决方案。
[Abstract]:In recent years, with the increasingly strict emission standards of pollutants in coal-fired power plants, it is particularly important to control the denitrification system of coal-fired power plants. SCR denitrification system is a typical large delay, large inertia object, and has certain nonlinearity. There are input and output constraints, and traditional control methods are often difficult to achieve satisfactory control effect under the new emission standards, so it is necessary to study new control strategies. Model predictive control can predict the future output of the system according to historical information. It has certain control ability for large inertial object, and can deal with the constraints that are common in the control process, so, It has a broad application prospect in the control of SCR denitrification system. Firstly, based on the particularity of SCR denitrification actual object, the SCR reactor usually contains both sides of SCR B) and the way of national NOx examination for coal-fired power plant (check point is in smoke). Design multivariable control system, Aiming at the common constraints of SCR denitrification system, the corresponding constraint solution method is given, and the idea of interval control is introduced into predictive control, which proves the effectiveness and superiority of the control algorithm. Secondly, the adaptive predictive control method of SCR denitrification system based on Laguerre model is studied on the basis of keeping the advantages of coordinated control and interval control of two-side ammonia injection valve. Through the simulation test, we can see that the algorithm can adapt to the model change better. Finally, the optimal control software of denitrification system is designed and developed based on MATLAB software and C language platform, and put into operation on the spot, and its control effect is analyzed. And provides the corresponding solution to the problem.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X773

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