直流锅炉给水流量对汽水分界面的影响改.docx.pdfVIP

中图分类号：TK221 学校代码：13820 题目: 直流锅炉给水流量对汽水分界面的影响 学生姓名： 张凯 学 院： 电力学院 专 业： 热能与动力工程 班 级： 1201 班 学 号： 1210240170 校内导师： 马彦喜/马静姝 2016 年 5 月 摘 要 超零界机组在现代火力机组中已日益成为了主力机组，其锅炉采用直流锅炉。它 不像传统锅炉中存在汽包，其对给水控制提出了更高的要求。直流锅炉与汽包锅炉相 比具有很多优点。但在直流锅炉中，它的给水系统与主汽温控制系统、燃料量的控制 没有缓冲过程，故而它们之间的相互影响较大。 虽然给水系统在火电厂控制系统中只是一个小部分，但却对火电厂的安全运行起 很重要的作用。超临界直流锅炉给水控制直接关系到机组的安全性和经济性，是超临 界机组正常运行的关键。它保证水冷壁的安全，维持着锅炉水循环，并直接影响蒸汽 的温度与压力。所以给水系统是整个电厂稳定运行的基础。 关键词：直流锅炉 给水流量 给水控制 ABSTRACT In modern thermal power generating units, it is becoming the main unit of the main unit, because it is not the traditional drum boiler, but the Direct current boiler, which puts forward higher requirements for the control of the water supply. Supercritical once through boiler feed water control is directly related to the safety and economy of the unit, and it is the key to the normal operation of the super critical unit. Boiler is the main equipment of thermal power plant. It plays an important role in the production process of thermal power plant. With the constant expansion of unit capacity, supercritical once through unit has been widely used in thermal power plant. Compared with the traditional drum boiler, the direct current boiler feed water system and the main steam temperature control system, the amount of fuel control without drum buffer process, mutual influence. The water supply system is only a small part of the control system in the thermal power plant, but it plays an important role in the safe and stable opera