In our last Blog we asked the question “why are there so many different types of air pollution control devices on the market”. Let’s look at the major types: cyclones, wet scrubbers, bag filters, and electrostatic precipitators. Yes, there are many other varieties, but these are considered to be the main culprits!
Now for those who are unfamiliar with these machines, a good way of looking at them is to compare them with the household vacuum cleaners. The upright “stick” vacuum cleaner uses the cyclone mechanism to separate the dust from the air that sucks the dust up from the carpet or floor. The air spins round in the barrel of the machine, trapping the dust in the barrel and allows the cleaned air to go back into the room. Then detach the barrel and dispose of the dust in the bin.
The wet/dry vacuum cleaner forces the dirty air from the floor through a bath of water. The water traps the dust and allows the cleaned air to pass back into the room. This machine uses the wet scrubber principle. On completing the vacuuming task, throw the dirty water away.
The relatively old concept of the bag filter vacuum cleaner consists of a removable paper or fabric bag into which the dust laden air is sucked. The bag collects the dust and the cleaned air passes back into the room. The major disadvantage with this machine is when the bag gets full. It has to be removed and the dust is discharged into the dust bin – hopefully the collected dust doesn’t get blown away in the wind.
My problem comes when using this analogy is the electrostatic precipitator. I’ve never seen an ESP vacuum cleaner. Definitely too dangerous for household use!
Next time we get more technical and industrial!!
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