目 录 - I - 目录 引言··································1 第一章 绪论·····························2 1.1 换热站的发展概述························2 1.1.1 国外换热站发展概况····················2 1.1.2 国内换热站发展概况····················2 1.2 换热站的简介及运行现状·····················3 1.3 课题的来源及意义························3 第二章 换热站的构成和总体设计方案···············5 2.1换热站的简介···· ······················5 2.2换热站控制系统的构成· ·····················5 2.3 换热站控制系统的硬件······················6 2.3.1 换热器···························6 2.3.2 循环水泵··························7 2.3.3 阀门····························7 2.3.4 温度计、阀门························8 2.3.5 PLC S7-200·························8 2.4 换热站工作原理·························11 2.5 系统总体方案设计思路······················12 2.6 该方案要实现的控制功能·····················13 第三章 控制系统实施方案·····················15 3.1 换热站与热用户的连接方式····················15 3.2 温度的控制调节·························15 3.3 循环水流量的调节控制······················16 3.4 压力的调节控制·························17 3.5 换热站总体控制系统方案·····················18 3.5.1 换热站控制系统设计····················18 3.5.2 控制系统硬件总体框架图··················18 3.5.3 换热站控制系统电气图··········...
