Filter system with dry sorption
GARANT-Filter supplied the extraction and exhaust gas treatment system including heat recovery. The purpose of this system is to separate the particles from the exhaust air stream and treat the toxic gaseous substances with the help of additives.
- Heat exchanger system
- Filter system with mixing reactor
- Pre-separator with recirculation
- Storage and dosing unit for hydrated lime
- Activated carbon dosing unit
The plant was designed for semi-redundant operation with 75% of the air flow through one filter line and one fan. The filter system is responsible for both the melting furnace exhaust gases including the melting furnace hoods, the auxiliary dross tipping station and the exhaust gases from the pyrolysis drum. Thermal afterburning placed special demands on the control system. This allowed only a few pascals of vacuum variation.
By means of an additive-fed entrained flow process, the harmful gases generated during melting are efficiently reduced to a minimum. The adsorbent ensures that mercury, dioxins and furans are also effectively separated. The harmful gases react already in flight, and later on the filter bags. The dust cake of reaction products is later separated and discharged.