600MW汽轮机再热主汽门轴向密封改造

 崔志勇1,赵旭东1,卢祥远2,董玉泉3,王成木3,李天奇1,安惠伟1

(1.内蒙古达拉特发电厂,内蒙古 鄂尔多斯 017000;2.成都市蜀科科技有限责任公司,四川 成都 610063;3.四川省机械研究设计院,四川 成都 610063)
摘要:大型汽轮机再热管道上广泛采用了旋启逆止式的再热主汽门。这种阀门的阀杆轴向密封采用的是容易外漏且使用寿命短的球面金属硬密封结构。内蒙古达拉特发电厂#7机组汽轮机旋启逆止式再热主汽门阀杆轴向密封采用保留金属硬密封并在外侧加装填料密封的方法彻底解决了阀门外漏的问题,经实际生产证实,改造后的阀杆轴向密封效果良好;由于内侧的金属硬密封可以对填料密封形成有效的隔离保护,大大增加了填料密封的可靠性及使用寿命。
关键词:再热主汽门;轴向密封;漏汽
中图分类号:TK263 文献标志码:A doi:10.3969/j.issn.1006-0316.2017.07.007
文章编号:1006-0316 (2017) 07-0032-06
600MW Steam Turbine Main Reheat Stop Valve Axial Seal Restructuring
CUI Zhiyong1,ZHAO Xudong1,LU Xiangyuan2,DONG Yuquan3,WANG Chengmu3,LI Tianqi1,AN Huiwei1
( 1.Inner Mongolia Dalate Power Plant, Ordos 017000, China; 2.Chengdu Shuke Science and Technology Co. Ltd., Chengdu 610063, China;
3.Sichuan Province Machinery Research and Design Institute, Chengdu 610063, China )
Abstract:The reheat pipeline of large steam turbine widely use reheat stop valve in the swing check type. The axial sealing used on this valve stem is easy to leak and short service life for the use of spherical metal hard sealing structure. The Inner Mongolia Dalate power plant #7 unit turbine swing check type reheat stop valve the method retains the axial seal metal seal and add the packing seal on the outside of the valve Leakage has been completely solved. It has been confirmed that the sealing is effective after transformation of stem axial density. The inner side of the metal seal can provide isolation protection effectively on the packing seal, and greatly increase the reliability and service life of the packing seal. 
Key words:reheat the main stop valve;axial seal;steam leakage
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收稿日期:2017-03-10 
作者简介:崔志勇(1976-),男,河北唐山人,本科,工程师,主要从事火电厂汽轮机检修技术工作。
 

 

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