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大口径截止阀容易老化内漏的原因

大口径截止阀容易老化内漏的原因

作者:广旭国际贸易    来源:德国洛克    发布时间:2020-08-03 10:05    浏览量:
大口径截止阀容易老化内漏的原因
Causes of aging and internal leakage of large diameter stop valve


 
大口径截止阀一般应用在锅炉出口、主分汽缸、蒸汽主管等位置,这些位置存在以下问题:
The large-diameter stop valve is generally used at the boiler outlet, main sub cylinder, main steam pipe and other positions, which have the following problems:
    
1)锅炉出口一般压差比较大,因此蒸汽流速也更大,对密封面的冲蚀破坏作用也较大。另外锅炉燃烧效率不可能为100%,这样将造成锅炉出口处的蒸汽含水量较大,容易对阀门密封面产生空化和汽蚀的破坏作用。
 
1) Generally, the pressure difference at the outlet of the boiler is large, so the steam flow rate is larger, and the erosion damage effect on the sealing surface is larger. In addition, the boiler combustion efficiency can not be 100%, which will cause a large water content of steam at the outlet of the boiler, and it is easy to cause cavitation and cavitation damage to the valve sealing surface.
    
2)对锅炉出口及分汽缸附近的截止阀,因为刚从锅炉出来的蒸汽,有间断性过热现象发生,在其饱和的过程中,若锅炉水软化处理不是太好的话,往往会析出部分酸碱物质,对密封面会造成腐蚀和冲蚀;还有一些可结晶的物质也可能附着在阀门密封面结晶,导致阀门无法严密密封。
2) For the stop valve near the boiler outlet and the cylinder, because the steam just coming out of the boiler has intermittent overheating, in the process of saturation, if the boiler water softening treatment is not good, some acid and alkali substances will be separated out, which will cause corrosion and erosion to the sealing surface; There are also some crystallizable substances may adhere to the valve sealing surface crystallization, resulting in the valve can not be tightly sealed.
    
3)分汽缸进出口阀门,因阀后蒸汽用量因生产要求等原因而造成用汽量时大时小,在流速变化较大的情况下,很容易产生闪蒸、空化等现象,从而对阀门密封面造成冲蚀、汽蚀等破坏作用。
3) For the inlet and outlet valves of the cylinder, the steam consumption after the valve is large or small due to production requirements and other reasons. In the case of large flow rate change, it is easy to produce flash, cavitation and other phenomena, thus causing erosion, cavitation and other damage to the sealing surface of the valve.
   
4)一般大管径管线开启时,都需要对管线进行预热,而预热过程一般要求很小流量蒸汽通过,使管线缓慢均匀加热到一定程度后,才能完全开启截止阀,避免造成管线急速升温而产生过度膨胀,损坏部分连接部位。但在这过程中,阀门开度往往非常小,从而造成冲蚀率远远大于正常使用效果,严重降低阀门密封面的使用寿命。
4) Generally, when the large-diameter pipeline is opened, the pipeline needs to be preheated. In the preheating process, a very small flow of steam is generally required to pass through, so that the pipeline can be slowly and evenly heated to a certain degree before the stop valve can be fully opened, so as to avoid excessive expansion caused by rapid temperature rise of the pipeline and damage of some connecting parts. But in this process, the valve opening is often very small, resulting in the erosion rate is far greater than the normal use effect, seriously reducing the service life of the valve sealing surface.
 
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