蒸汽节能排空气阀

日期： 2024-04-17 作者：晟德亿编辑

在蒸汽系统上安装手动排气阀，有明显的效果，但这会给操作和管理带来额外的成本。常用的排除空气和不凝性气体的方法是在蒸汽系统上安装热静力排空气阀，这会有意想不到的效果和好处。

依据道尔顿分压力定律，蒸汽与空气混合气体总压力等于各组成气体的分压力之和；道尔顿分容积定律，混合气体总容积等于各组成气体的分容积之和。

空气的存在降低了蒸汽分压力，从而降低混合气体系统温度，而蒸汽系统自动排空气阀依靠检测混合气体温度而排放的热静力原理工作，安装在蒸汽和空气能到达的地方。如果排气阀直接装在坚实的加热器上，且在接近蒸汽饱和温度下工作，换热器传递的热量可能会让排气阀关闭，或者至少排气速度减慢。因此排空气阀和其相连的管道不要保温，以便能正确开关。

在此情况下，最好在排空气阀前加装300mm的短管，这样既可以积聚空气又可以使得排气阀的温度低于加热器蒸汽空间的温度，安装在设备外部疏水阀之前的瓶形装置也可以作为空气收集装置。

当排空气阀排气时，不可避免地会排出一些蒸汽和空气的混合气体，即使是纯净蒸汽也可能会被察觉到，按照逻辑判断，这的确是在泄露蒸汽，但排放程度最终减少直至停止，这说明排气阀工作正常。如果排气阀长时间排放且没有关闭迹象，那就是有问题，应该检查修理了。

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