Relationship between fan and current
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Site description: A positive-pressure container contains only gas; a fan is used to extract air from the container, which is then discharged through pipes into a chimney. Problem description: If the gas pressure inside the chimney is too high and flows back toward the fan’s exhaust outlet, how should the fan’s current change in this case? As I understand it, the current in the fan should increase at this point, but my colleague said that it is normal for the current to decrease at this time. How should I interpret this? Has anyone encountered such a situation on site? Thank you all
Both the fan and the chimney are designed in such a way that backflow should not occur
If there is indeed a reverse operation, the fan’s power will definitely be insufficient; it has been chosen to be too small
Your colleague is right; the back pressure of the fan has exceeded the head pressure, which is equivalent to the outlet valve being completely closed, and as a result the current will decrease
The phenomenon you mentioned should occur only when the fan is experiencing surge. The moment when the current is at its lowest is when the gas flows backward momentarily, and this occurs with periodic fluctuations. For reference.
Upon checking relevant information, it is essentially related to the type of fan; their current curves are also different, which is why varying current curves appear.
Upon checking relevant information, it is essentially related to the type of fan; their current curves are also different, which is why varying current curves appear.
Hehe, after reading your replies to everyone, it turns out that the problem lies in the way you described it. If the issue isn’t resolved, it’s better to describe your problem in detail, including the actual conditions on site, for reference.