Discussion on the dust removal efficiency of the water film dust collector in spray drying towers
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In the actual operation of our company’s spray drying tower with water film dust collectors, there is a problem of foam carrying material being discharged from the exhaust stack. It has been observed that foaming does not occur when the solubility of the material being dried is high; however, for materials with lower solubility, foaming is severe, and the escaping bubbles cause serious pollution to the surrounding environment. We have tried installing a wire mesh filter at the top of the exhaust stack of the water film dust collector, but the results were not satisfactory. Since there is no space to add bag filters in front as well, what other effective solutions are available to address this issue?
I was wondering what type of water film dust removal system is used in your company’s spray drying tower? Is it a conventional water film (water bath) dust collector, or is it of an impact-type design or something similar? Personally, I think there could be two reasons for this situation: first, the air intake speed is too high; second, the defogging and demisting effect is poor!
I believe that the cyclone separation effect is not satisfactory, which results in an excessive amount of powder reaching the dust removal device fed with water. The fundamental solution should be to improve the separation efficiency in the preceding stage depending on the specific conditions; if those conditions cannot be met, it is recommended to add a small buffer tank equipped with a spray system after the exhaust stack. It does not need to be very large – it is sufficient as long as the spray water can break up and absorb the bubbles. It's just my personal suggestion; feel free to correct me.
If there is space to install a marble water film, there should be space to install a bag filter after it is removed, and the arrangement of the bag filters is quite flexible.
The effect of adding a bag filter is certainly achievable, but the blowers, exhaust fans and other systems need to be recalculated and replaced.
This approach is correct; several sedimentation chambers can also be installed at the tower outlet, with the aim of settling particulate matter as well
Bag filters require a large amount of space, and they demand higher power from the motors used for air supply and exhaust, which in turn increases operating costs; this is not very ideal. Do those working on environmental protection and dust removal have any better solutions? There is a huge market demand in this area; it remains an unexploited market segment, offering endless business opportunities!