毕业论文thCFB锅炉床温模糊PID控制系统的设计

精品文档---下载后可任意编辑摘要循环流化床锅炉具有燃料适应性广、截面热强度高、污染物排放少、锅炉负荷适应性高、燃料制备系统相对简单等优点。正是由于循环流化床锅炉具有如此多的优点，从而加快了循环流化床锅炉的商业化进展。但是循环流化床锅炉是一个分布参数、非线性、时变、大迟延、多变量耦合紧密的控制对象，这也就给循环流化床锅炉的运行控制提出了更高的要求。本文首先从循环流化床原理入手，简要说明了循环流化床锅炉的结构和优点，并且分析了锅炉的控制模型。针对锅炉床温控制难题，设计了基于模糊逻辑的循环流化床模糊解耦控制器，说明了控制器的优缺点，并进行仿真对比。从仿真结果来看，控制器达到了比较令人满意的效果，控制器在稳定性、适应性、鲁棒性等控制特性上比常规 PID 控制要好。关键词：锅炉炉膛负压； PID 控制；模糊 PID 控制；仿真精品文档---下载后可任意编辑DESIGN OF 500t/h CFB BOILER BED TEMPERATUREFUZZY PID CONTROL SYSTEMABSTRACT Circulating Fluidized Bed Boiler(CFBB or CFB Boiler)have fuel adaptability,The warmhearted intensity of section is high,The contaminant places in proper order a moment.Boiler burden adaptability is good.The fuel is prepared the system distinguishing feature such as easy relatively and so on.As we know,CFBB is a control object that points of distributing parameter and nonlinear and timevariable and strong delay and coupling tightly multivariable,So the higher demand CFBB automation is proposed． Here by introducing the theory of CFBB,briefly illustrates the structure and advantages of CFBB,meantime analyses the control model of CFBB．Focusing on complex dynamic characteristic involved in combustion process of CFBB,proposes fuzzy logic based CFB fuzzy decouple controller.The statements of the controller's advantage and disadvantage are made.The simulation is proceeded.The result shows that synthetically fuzzy controller can provide US a better control quality,robust,speediness than the general PID control system．Key ...