换热设备内的水锤问题介绍

日期： 2024-05-07 作者：晟德亿编辑

失流问题引起的设备积水。失流是指疏水阀后的总背压大于或等于换热设备内蒸汽空间的压力，导致设备内冷凝水无法排除而引起积水。换热设备失流，主要有两种可能：1）换热面积过大引起失流。换热设备的换热面积过大时换热能力提高，换热器所需蒸汽压力降低，导致换热器内蒸汽压力过低而引起失流；2）二次侧流体入口温度升高/流量降低/出口设定温度降低引起失流。这三种情况都回引起换热系统负荷降低，使得控制阀关小以降低蒸汽的压力，导致设备出口疏水阀前后压差偏小而失流。

疏水阀选型问题引起换热设备积水。疏水阀选型过小或疏水阀疏水温度过低（如热静力型）也会导致换热设备内部冷凝水不能及时排除而积水。

设备内部积水一定会引发水锤吗？实践证明，当设备下端的冷凝水温度与蒸汽温度相同时，不会有蒸汽被冷凝水冷凝，也没有水锤发生；当冷凝水的温度远低于蒸汽温度时，蒸汽接触到低温冷凝水时瞬间冷凝，只会产生很少蒸汽泡，几乎不会产生水锤；当冷凝水与蒸汽温差为20-30℃时，蒸汽被冷凝水冷凝速度较慢，蒸汽与冷凝水接触时间较长，会有大量的汽泡聚集，当蒸汽达到冷凝点时，大量的蒸汽瞬间冷凝，大量汽泡破灭，其体积瞬间缩小几百到上千倍，真空区瞬间形成，冷凝水会被高速吸到这个真空的空间，形成水锤。

上一篇：换热系统蒸汽入口发生的水锤问题介绍下一篇：节能减碳，增效为先

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蒸汽引射提温升压 ORC发电冷凝水疏水系统蒸汽发生器可以节能吗？蒸汽疏水阀的作用有哪些？乏汽闪蒸设备固定流道式闪蒸系统焓差补偿式扩容净化回收器蒸汽减温减压器冷凝水回收装置蒸汽疏水阀有哪几种？蒸汽减温减压蒸汽疏水阀为什么会漏汽？高频电磁蒸汽发生器G-ZQ 120KW 乏汽增压系统

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