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[2017]温度自动控制仪表电伴热保温不当引起的故障现象

发布于:2017-01-02 16:14来源:安邦电伴热带 作者:电伴热带厂家点击:

当电伴热温度过高.超过蒸发罐正常工况下水的沸点时,就会出现上文所述在变送器负压管中形成气/液两相的现象,引起变送器输出信号振荡,液位显示值剧烈波动,自动状态下,调节阀也跟着来回开关,最终因冷凝水被蒸发而使液位示值要比真实液位高。

而当没有伴热或伴热效果不佳.负压管出现冻堵时.因冷凝水结冰而体积膨胀.在变送器负压侧产生的压力迅速加大.从而抵消或远高于变送器正压侧罐内真实液位的压力.最终使得液位变送器输出减小至零点以下,液位显示值从正常示值迅速下降为零。而此时如果液位控制处于自动状态下时,因液位设定的给定值与液位测量值偏差增大,控制系统迅速将调节阀开到最大进行加料.使真实液位不断上升.超过工艺允许的最高液位.而此时DCS操作站上的液位示值还保持在零。另外,对液位变送器正压侧接VI处及负压侧负压管取压口进行冲洗的冲洗水支管也需进行良好的伴热.这些冲洗水管一旦冻堵.则有可能导致变送器测量膜片出现结垢、负压管取压口堵塞,同样会使液位测量出现故障。

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