发电厂燃煤锅炉燃烧PLC控制系统设计.doc.doc

发电厂燃煤锅炉燃烧控制系统设计 摘要 在热电厂中，以单位机组为控制对象有：锅炉汽包水位控制、燃烧过程控制以及过热蒸汽温度，过热蒸汽温度控制又包括过热蒸汽温度控制和再热蒸汽温度控制。其中，热电厂锅炉的燃烧控制对整个发电过程的安全性与经济性起着重要的作用，所以对它高效率的控制是现在热电厂的一个重要任务。 本文以一台工业控制机作为上位机，以西门子S7-300可编程控制机为下位机，系统通过变频器控制电机的启动，运行和调速。上位机监控采用WinCC设计，主要完成系统操作界面设计，实现系统启停控制，参数设定，报警联动，历史数据查询等功能。下位机控制程序采用西门子公司的STEP7编程软件设计，主要完成模拟量信号的处理，温度和压力信号的PID控制等功能，并接受上位机的控制指令以完成风机启停控制，参数设定，循环泵的控制和其余电动机的控制。 关键词:热电厂；锅炉燃烧；单片机；控制 Coal-fired power boilers burning single chip control system design Abstract Thermal power plant boiler combustion control plays an important role in security and economy of the entire power generation process, the control of its high efficiency thermal power plant is an important task. In this paper, the analysis and study of the entire combustion system, the boiler combustion control system, main steam pressure control system and the furnace pressure and control system control program, then its control law and parameter selection and tuning. Instrument selection, using advanced digital instrument, and using the Cygnal microcontroller design an intelligent combustion control system, given the hardware and software flow chart. The controller to the new C8051F020 MCU as the core, the use of fuzzy PID algorithm for computing and control, not only can be analog, digital signal sampling and processing, but also to complete the state detection and control, alarm and fault handling functions. The control system has a fast, high precision, high reliability and a simple hardware structure. Finally, you can reach the boiler safe, economical and efficient operation. Keywords: heat and power plant; boiler combustion; microcontroller; control 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc323940817 摘要 PAGEREF _Toc323940817 \h 1 HYPERLINK \l _Toc323940818 Abstract PAGEREF _Toc323940818 \h 1 HYPERLINK \l _Toc323940819 目录 PAGEREF _Toc323940819 \h 1 HYPERLINK \l _Toc323940820 第一章 绪论 PAGEREF _Toc323940820 \h 2 HYPERLINK \l _Toc323940821 1.1研究目的和研究意义 PAGEREF _Toc323940821 \h 2 HYPERLINK \l _Toc