Bokela - Model BoHiBar -Pressure Drum Filter
Intensive filter cake wash. Low residual moisture. Gas-tight and completely leakproof operation. Complex process conditions. Minimal footprint. Such challenges master the continuous BoHiBar drum filters with flying colors. Particularly dry solids are achieved with BoHiBar steam pressure filtration.
BoHiBar Drum filters deliver unique results in the filtration, washing and demoisturing of fine-grained or difficult-to-filter products, especially in demanding product and process conditions.
High filtration pressure differences up to 6 bar (g) ensure high specific throughputs, intensive cake washing and very low residual moisture. The closed design ensures a gas-tight, leakproof operation when high process pressures and temperatures must be maintained or contamination must be avoided. The space requirement is minimal.
For particularly low residual moisture, steam pressure filtration can be performed on BoHiBar Drum filters. This innovative hybrid process produces particularly dry solids.
BoHiBar drum filters from BOKELA represent the most advanced technology for continuous pressure filtration.
The basic principle is also known as hyperbaric filtration and is very simple: a continuous rotary filter is installed completely in a pressure vessel filled with compressed gas of up to 7 bar (a). A pump feeds the suspension into the filter trough in the pressure vessel. The filtrate flows through the filtrate pipes to the control head of the filter apparatus and from there to the filtrate reveivers. The filter cake is discarded from the filter cloth by a reversed blast of compressed gas and discharged through solids locks from the pressure vessel.
- filtration with high differential pressures Δp up to 6 bar (g)
- most modern drum filters with features known and proven by the BoVac Drum filter technology (replaceable filter cells are optional)
- operating temperature up to 200 °C
- option of installing a steam hood for steam pressure filtration
- closed, contamination and emission-free process chamber: gas-tight and leakproof
- no filter cake conveyor in the pressure vessel required
- fully automatic cleaning-in-place (CIP) system
- vertical pressure vessel*, horizontally split and fully opening – optional automatic opening
- fast and excellent accessibility of the filter
- proven gate valve systems for different requirements (double gate valve, rotary valve)
*) for filter sizes up to 18 m² filter surface, drum filters with 40 m² filter surface have a horizontal pressure vessel.
BoHiBar drum filters are available in different sizes with filter areas up to 40 m2 per filter unit.
- filtration of fine-grained, sensitive or toxic products
- highly efficient filter cake washing
- lowest residual moisture, especially with steam pressure filtration
- saving of drying costs or making thermal drying redundant
- high process pressures up to 7 bar (a) and high temperatures up to 200 °C
- gas-tight and completely leakproof operation
- also suitable for solvent-based suspensions
- possibility for direct re-slurrying of the filter cake (also under counterpressure)
- continuous, fully automatic operation