Why isn’t the feed water pump for the waste heat boiler supplying water?
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Our waste heat boiler is equipped with a multi-stage feed water pump with a head of 600m; this pump suddenly stopped delivering water this morning. The current flowing through the pump was normal, as was the outlet pressure, but there was no flow of water from the pump. The boiler water level drops, while the drum pressure rises. According to the worker who inspected the equipment, when there is a problem with the feed pump, its noise level is much lower than normal. Our analysis shows that the temperature of the water coming from the deaerator at the inlet of the feed pump is too high, resulting in vaporization at that inlet. Could everyone help analyze what the reason is?
It’s really hard to say! There isn’t enough information! ! !
If it didn’t vaporize before, the probability of it vaporizing now is low; it’s possible that the inlet filter is clogged.
In short, the machine is working fine, but the flow rate per unit time has decreased; it is recommended to reverse the pump to clean the filter screen.
The boiler feed water pump in our facility also experiences occasional sudden loss of flow, but the symptoms are different from those described by the original poster; it seems to be related to the amount of steam in the deaeration tank. Previously, when the steam volume was low, both the inlet and outlet pressures of the pump would drop, but recently the situation is reversed – when the steam volume is high, it is the inlet and outlet pressures that drop. The reason for this is not clear. I consulted various experts and specialists!
First, based on the design parameters, check whether there are any deviations in all the data and by how much