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汽轮机汽封改造的节能效果分析_王学栋.pdf

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山东电力技术 第 卷(总第 期) 年第 期 41 203 SHANDONG DIANLI JISHU 2014 6 ·经验交流· 汽轮机汽封改造的节能效果分析 Energy Saving Effect Analysis of Steam Seal Modification for Steam Turbine Units 王学栋,郝玉振,董 洋 (国网山东省电力公司电力科学研究院,济南 250002 ) 摘要:介绍通流部分综合升级改造的330 MW 汽轮机汽封改造方案,分析所采用蜂窝汽封、刷式汽封、接触式汽封等新型汽 封的工作原理、优点和在汽轮机轴系、通流部分中适用的部位。 刷式汽封在汽轮机上的应用比较广泛,高、中、低压缸各部位 均适合;接触式汽封主要应用于轴端密封;蜂窝汽封用在低压缸末级、次末级叶顶部位及高、中压缸轴端。330 MW 汽轮机高、 中、低压缸轴端采用3 种汽封相结合的方案改造后,轴封漏汽量明显减小。 汽轮机高、中压后轴封漏汽量、经过轴加的凝水温 升都有明显的降低;高、中压缸间平衡盘汽封漏汽量占主蒸汽流量的份额为1.02% ,小于THA 工况设计数据 1.503% ,汽封改 造的节能效果显著。 关键词:汽轮机;汽封改造;刷式汽封;柔齿汽封;蜂窝汽封 odification scheme of flow passage of two 330MW steam turbine units are introduced , s well as the operating Abstract: M a principles and advantages of honeycomb seal , ush seal and contact seal.Application positions of these kinds of seals in rotor br ends and flow passages are also introduced.Brush seal is widely used both in rotor ends and flow passages of high pressure ( ) , ntermediate pressure ( P ) nd low pressure ( P ) ylinder of steam turbine units , le contact seal is mainly used in HP i I a L c whi rotor ends.Honeycomb seal is mainly used in rotor ends of HP and IP cylinder , s well as last two blade tips of LP cylinder. a After modification in rotor ends of HP , and LP cylinder combined with the above three kinds of seals , team leakage is
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