Coaters of manufactured plastic items
must comply always stricter laws about solvent emission reduction, and they are
very worried about investment cost necessary to purchase after burners
available on the market (nowadays called thermal oxidisers). They must consider
also to spend more resources to incinerate solvents as eventual downtimes (or
in case of low concentration of emitted solvents) it is compulsory to fuel the
thermal oxidiser with methane gas in order to keep temperature since Vocs
coming from the booth are very low.
Came (Bussero, Milano, Italia), a
company specialised in plants for solvents abatement through self-generating
actived carbons, through an innovate technology developed by Ezio Crespi, the
main expert in this sector.
HT company (Cherasco, Cuneo, Italia) installed
this kind of plant to abate solvents: in the area where the company operates
the emission limit is 50 mg Nm3/h, the plant does not emit more than 5 mg/h (it
treats 40.000 Nm3/h of polluted air coming from the booth and the curing oven)
The cost investment is less than 50%
compared to a traditional thermal treatment system, and the management costs
are between 50 and 100 euro monthly.
The enterprise coats plastic
components for the Italian automotive industry.
The VOC treatment plant through
activated carbons is very simple ant very smart at the same time:
-
The fumes emitted by the booth and
the oven (the plant treats 40.000 Nm3/h of polluted prior to filtration) are
canalised to the plant
-
Vocs are absorbed by activated carbons that once saturated, are regenerated
with stream vapours obtained from stripped solvents combustion.
CONCLUSIONS
The solvents abatement of the coating
plants, for those who are forced to use solvent-based coatings is not a
productive step but compulsory to comply polluting emissions with parameters
prescribed by law.
So those who coat must evaluate the
abatement plant operational capacity; to reduce to minimum the investment cost
and the operational cost: plant developed by Crespi and manufactured by CAME is
a really efficient solution.
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