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Taper roller bearing|Deep groove ball bearing|Angular contact ball bearing|Self-aligning roller bearing|Cylindrical roller bearing|Jingzhou Bearing

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叙述自密封轴封系统的组成和工作原理

2024-11-14

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王浩 罗和海

自密封轴封系统由轴端汽封、轴封供汽母管、轴封供汽压力调整机构、轴封冷却器、轴加风机、减温器及有关管道组成。  

一般其高压缸排汽端轴封分为4段3腔室,压力从高到低,3腔室分别连至除氧器、轴封供汽母管和轴封抽汽管道至轴封冷却器;中压缸排汽端和低压缸两端轴封分为3段2腔室,2腔室分别连至轴封供汽母管和轴封抽汽管道至轴封冷却器。

在机组正常运行时,靠高、中压缸两端轴封漏汽进轴封供汽母管作为低压缸两端的轴封供汽,即实现自密封。  

在机组启动、空负荷和低负荷时,可选择由辅助蒸汽、主蒸汽或冷再热蒸汽分别通过三个压力调节阀向轴封供汽母管供汽以防止空气漏入汽缸。在轴封系统进入自密封后,通过溢流阀排走过量的蒸汽,调整轴封供汽母管压力。  

为防止高温蒸汽进入低压缸两端汽封而造成汽封体和轴承座受热变形,由凝结水通过减温器向轴封供汽母管喷水,从而维持汽封蒸汽温度在121~177℃之内。

来源:阳西电厂集控运行微培训

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