300MW汽轮机中压缸抽汽口上下缸金属壁温差大原因分析及处理  

Large Metal Temperature Difference Between Upper and Lower Cylinders Extraction Points Analysis of 300 MW IP Cylinder and Its Treatment

作　　者：杨柏 

机构地区：[1]神华国能神东电力集团萨拉齐电厂,内蒙古包头014100

出　　处：《内蒙古电力技术》2015年第5期91-94,共4页Inner Mongolia Electric Power

摘　　要：通过对某电厂2号汽轮机中压缸抽汽口上下缸金属壁温差增大的原因进行排查与分析,排除了热工仪表不准、中压汽缸下缸积水、汽缸保温不良等因素,确定引起中压缸抽汽口上下缸金属壁温差大的原因为中压缸导汽管进汽插管密封环泄漏。在不揭缸的情况下,经过多种方案比较,最终采用增加再热冷段至中压缸混温汽源的方式,将中压缸抽汽口上下缸金属壁温差控制在合理范围内,不仅达到了设计要求,而且保证了机组的安全稳定运行。Cause analysis of large extraction point metal temperature difference between upper and lower cylinders of 300 MW IP cylinder of unit 2 showed that the leakage of admission pipe packing washer of IP cylinder steam conduit caused the large temperature difference.What＇s more,the facts of incorrect thermodynamic instrument,seeper of the lower cylinder,and cylinder lagging leading to the large temperature difference were excluded.In the case of no scale deposit removing,by comparing different projects,the project of increasing mix temperature steam source to the pipes from reheat cool section to the IP cylinder was conducted to solve the problem,by which not only the temperature difference could be controled to the normal level,but also ensured the safe and stable operation of the unit.

关 键 词：汽轮机中压缸 抽汽口 金属壁温 温差 混温汽源 高压加热器 低压加热器 解列 

分 类 号：TM621[电气工程—电力系统及自动化] TM311