600MW汽轮机组汽封结构经济性评价..docVIP

600MW 汽轮机组汽封结构的经济性分析  600MW 汽轮机组汽封结构的经济性分析 摘要 汽轮机分为两部分：固定部分和转动部分。当汽轮机工作时，转子会高速旋转， 如果固定部分和转子之间没有间隙，势必会导致摩擦和磨损。但是间隙的存在会使得 蒸汽泄漏而导致做功能力减少。为了解决这一矛盾，汽轮机组一般都安装了汽封。但 是由于传统汽封存在一定的缺点而逐渐被新型汽封所代替。 本文重点介绍了传统迷宫式汽封、莱德系列蜂窝汽封、美国布莱登汽封和零间隙 刷式汽封。由于这些汽封大大地提高汽轮机组的效率，各个电厂的安全性和经济性都 得到很大的提高，他们都先后在国内外的电厂汽轮机得到广泛运用。接着本文分析了 每种新型汽封与传统汽封的创新点和他们的优缺点，最后得出了汽封改进措施：600 MW 汽轮机组的低压缸汽封改成蜂窝汽封，高中压缸汽封改成布莱登汽封，理论分析 可知这种改进措施不论是在安全性上还是在经济上都是可取的。 关键词：汽封；汽轮机；经济性；蒸汽泄漏量 600MW 汽轮机组汽封结构的经济性分析  ECONOMIC ANALYSIS OF SEALS IN 600 MW STEAM TURBINE UNIT ABSTRACT Steam turbine consists of two parts:the fixed part and rotating parts. The rotor carry high-speed rotating during the steam turbine is working. So if no gap between the fixed part and rotor, they will lead to the friction and wear inevitably. But the gap can lead to steam leakage and reduce the power capability. In order to solve this contradiction, the steam turbine unit is generally equipped with the seal. Because the traditional labyrinth seal has some drawbacks, it replaced by the new seal gradually. In this study, the traditional labyrinth seal, blackrocks series of honeycomb seal, American brendan seal and zero clearance brush seal are given. They are widely used successively in power plant, because they greatly improve the efficiency of the steam turbine unit, the power plants safety and economy .Then this paper analyses the differences of each new steam seal and shows their advantages and disadvantages. Finally in this paper, two improvement measures about the seal are put forward. 600 mw steam turbine unit of low pressure cylinder adopt the honeycomb seal, while high pressure cylinder use the brendan seal. Theoretical analysis shows that the improvement measures are desirable both safely and economically. Key words: steam sealing; steam turbine; economy; steam leakage 600MW 汽轮机组汽封结构的经济性分析  目录 1 绪论 ......................................................................................................