【作者】 张智宇；

【导师】 李兵；

【作者基本信息】 哈尔滨工业大学 ， 飞行器设计， 2006， 硕士

【摘要】 循环流化床燃烧技术是近年来得到广泛应用的新型燃烧技术,主要应用于火力发电领域以代替传统的燃烧方法。循环流化床锅炉是一个大滞后、多变量耦合的控制对象,控制过程复杂。当前我国对于循环流化床锅炉的应用和控制还沿用手动控制方法。本文针对循环流化床锅炉控制中的燃烧控制问题,以75t/h循环流化床锅炉DCS系统项目为背景,开展了基于集散控制系统(DCS)的专家系统的研究与开发,模拟熟练工程技术人员的控制方法,对提高循环流化床锅炉自动化水平做了有益的尝试。本文中应用CLIPS语言开发循环流化床锅炉燃烧控制的专家系统,应用模糊统计法对目标参数进行处理,用VC++编写用户界面,通过DLL混合方式编程设计VC++与CLIPS的接口,通过DDE动态数据交换技术实现专家系统与DCS系统之间的数据交换。本文分析了汽包水位在蒸汽扰动和给水扰动下的动态特性,针对于此选用了三冲量水位控制方法,通过大量的现场调研和实际经验的总结,以山东沂水热电厂DCS项目为背景,设计了一套符合中、小电站锅炉的DCS系统。该系统集成了台湾盟立公司的下位控制硬件FAMA系列产品和美国控软公司的PLC控制软件SoftPLC,采用下位机控制网络和上位机以太网相结合,满足了数据通讯的需要。本文详述了DCS系统的组态方案,包括下位机的数据采集,数据通讯,PLC控制程序编程,以及上位机的监控画面,报警和历史数据查询。本DCS系统经过现场的组态和调试,最终实现了控制设计要求,在系统实际运行中,取得了很好的控制效果。更多还原

【Abstract】 Recently as a new burning technology, Circulating Fluidized Bed(CFB) burning technology is widely applied in fire power based electrical generation industry in stead of the traditional methods. CFB Boiler has the features of large-delay, coupling tightly, multivariable and complicated control process. Currently in power plant, the main control process is still handled by manual operation. Focusing on the burning control issue of 75t/h CFB project. The further researches about expert system based on Distributed Control System(DCS) are carried out by simulating the manual control method of skilled engineers, The work provides a good trial on enhancing automation level of the CFB Boiler. The following works are focused:Expert system is developed in C Language Integrated Production System(CLIPS) and applied to deal with the parameter with Fuzzy Statistic. Visual C++ is used to develop the interface with the CLIPS through the Dynamic Link Library(DLL) mixed programming. With the Dynamic Data Exchange(DDE) expert system fulfills the function of communication with the DCS.Three-parameter control arithmetic is used after analyzing the water level dynamic characteristics under water supply and steam disturbance. By many investigation and practice and based on the engineering in Yishui city, the DCS is designed to integrate FAMA series control hardware (from Mirle Inc.) with SoftPLC control software (from Controlsoft Inc.). Combining with the control net and Ethernet, data communication can conform to the design requirements. DCS configuration includes data collecting, communication, PLCprogramming, HMI designing, warning and history data querying. Through testing in running the DCS fulfills the control requirements and the excellent control effect is achieved.更多还原