Dust extraction in metal scrap
Shredder installations for metal scrap and/or car wrecks are typically associated with emissions of dust, PCBs, and VOCs. Moreover, such installations are often subjected to the risk of fire and explosions. The Keller filter systems control all these challenges.
Dust from shredders can be handed in one of two ways: via a dry dust filter or via a Venturi wet filter. A cyclone is used as the first filter stage for both solutions.
If the risk of explosion is low to nil in the shredder, a dry dust filter can be used. Material and dust are filtered in this case by the cyclone and dust filter.
The corresponding VOCs are filtered through an active carbon filter.
If there is a risk of explosion in the shredder, a Keller Venturi wet filter is provided as a dust filter. Very low dust emission values can be guaranteed thanks to the Venturi principle.
To be able to keep the forcesunder control incurred during explosions, the Venturi wet filter, cyclone and pipework are provided with the necessary relief openings.
Here too an active carbon filter is used for filtering VOCs. An ultra-filter is provided beforehand to remove PCBs from the air stream. With the ultrafilter, an additive is continuously coated on the filter surface. In this way, PCBs can bind particles and can be filtered out of the air stream.
In addition, a longer service life is obtained from the activated carbon filter.