Fan Efficiency Tip for Dust Collectors

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What’s the secret to fan efficiency when used with a dust collector? Hint: it varies. Senior Application Engineer Chet White shares the rest of the secret.
If your industrial fan application involves dust collection and a variable frequency drive (VFD), we have a simple tip for improved fan efficiency. It’s all about location. The location of your pressure gauge can make all the difference in fan efficiency for dust collectors. This is because dust collectors include a baghouse with a filter, which gets dirtier as it does its job. When it’s clean, the fan does not need to run as fast to move the right amount of air through the system. The dirtier the filter, the higher the speed needed. By placing the pressure gauge at just the right spot - the inlet of the baghouse - you will optimize fan efficiency by keeping horsepower consistent while matching the fan speed to the amount of pull necessary to move the air through the baghouse filter.
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Read Full Transcript:
We’re going to touch on a little helpful hint for you dust collector people out there. You’re setting up dust collection systems and you’re using a fan, and you’re utilizing a VFD. So you’ve got a motor over there and you’re hooked up to a VFD and you’re going to frequency control your VFD, where do you put your pressure gauge? Typically you can run your VFD from your control room, off of a loop that’s analyzing pressure within your system. So where should your pressure gauge be? If you have a baghouse, your fan is designed to keep your baghouse still pulling from the facility at the amount of air required to move the correct amount of air at the worst case of your bag filters. So when the bags are clean, you don’t need to run your fan quite as fast to still get the same pull. If you put your pressure gauge - your pressure switch - at the inlet of your baghouse and make it a constant level at that point, your fan speed is going to fluctuate up or down with relation to how dirty the filters in the baghouse actually are or how clean they are. So the cleaner the filters, the slower your speed. The dirtier your filters, the faster your speed. And you maintain constant motor horsepower.
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