自动化毕业论文--单元机组给水控制系统设计

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1、 毕毕 业业 论论 文文 系 别 动力工程系 专业班级 自动化专业 09K2 班 学生姓名 指导教师 二二一三一三年六月年六月 题 目 单元机组给水控制系统设计 I 摘 要 随着我国电力市场的实际情况和国民经济发展的需要，电站项目向着高参数、大容量 的方向发展已成为大势所趋，近年来超临界发电机组在国内得到迅速发展和应用。 超临界锅炉将是国家未来的发展方向，给水系统是其中的重要环节。超临界直流炉的 给水控制技术是目前国内热控领域一个重要的研究课题。本论文介绍了超临界机组的概 况，分析了超临界锅炉的静、动态特性及控制特点与超临界锅炉给水系统的工艺过程，比 较分析了亚临界汽包锅炉与超临界直流锅炉给水

2、系统控制的异同，研究了超临界锅炉给水 控制策略。同时针对目前国内普遍使用的600MW超临界直流锅炉的给水控制系统，进行了 设计。设计内容主要包括锅炉干/湿态下给水流量控制的切换、PID模块的手/自动的无扰切 换、储水箱水位控制等部分，并对设计SAMA图逐一进行说明。 关键词：超临界直流炉；给水控制系统；燃水比；中间点温度；中间点焓 II THE DESIGNING ON PLANT UNIT FEEDWATER CONTROL SYSTEM Abstract It becomes a trend that the power station projects go forward to hig

3、h parameter and large capacity in consideration of chinas actual situation and the demand of the national economic development. In the past years the super-critical unit were applied and developed quickly. The supercritical boiler will be the future nationai tendency, and the water supply system is

4、an important link. The feedwater control of super critical once through boiler is an important study subject in thermal field at present. This paper introduces the general situation of supercritical unit, analyses the static or dynamic characteristics and the control feature of the supercritical boi

5、ler . The technological process of supercritical boiler feed water system is analyzed too, Comparative analysis the similarities and differences between the subcritical and supercritical once-through boiler steam drum boiler feed water system control, studies the strategy of the supercritical boiler

6、 feed water control. At the same time, designs the 600MW supercritical once-through boiler feed water control system in view of the present domestic universal. Design content mainly includes Boiler feed water flow control under the wet/dry state switch, running state of the switch of hand/auto undisturbed switching of PID module, storage tank water level control, illustrates the design SAMA graph one by one. Key Words：Supercritical once-through boiler; Feedwater control system; Coal to