Methods for treating the dusty exhaust gas from PVC cyclone drying
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In a PVC cyclone drying system, how should the dust-laden exhaust gas discharged from the secondary cyclone separator be treated? The environmental standards here are quite high. Are bag filters used everywhere, or is water bath dust removal employed, or are other methods adopted? Dear experts, please give some introductions. Thank you
If the dust content is high, an additional cyclone can be installed; if the dust content is low, bag filtration or water bath dust removal can be used, or a combination of both methods can be employed.
The dried exhaust gas contains dust, which is likely to be fine resin particles. Indicate that your drying device is leaking material. You should check from the aspects of air volume and the particle size distribution of the resin. No matter how strict environmental regulations are, they should be based on emission targets. If the dry exhaust gas does not leak, there will be no **substances prohibited from being emitted**.
The exhaust gas after cyclone separation can be further treated with a water bath for dust removal, allowing the resin powder to be recovered; we are working on this
The resin powder removed by the water bath has turned into a slurry; how can it be recycled?
According to the Emission Standards for Air Pollutants, the allowable emission level for particulate matter is ≤120 mg/m3; it is estimated that all PVC manufacturers in China currently cannot meet this standard
Agree with this opinion. That makes sense; it indeed should be addressed at the source.
That’s correct: first, use an efficient cyclone separator to capture the majority of the particles, then use a wet dust collector to capture the finer particles, and finally discharge them.
First, use a cyclone separator for the first stage of separation, and then a bag filter for the second stage to capture fine dust, which can meet environmental protection requirements
Either one will work; for Niru’s fluidized bed drying, a bag filter is used, while the original Japanese-designed system employs a scrubber tower, using centrifugated mother liquor as the washing water – it depends on whether you want the material dried or kept wet.
Cyclone drying cannot separate very fine particles; a recovery device must be added