Rotary pressure filter (RPF)
Precise separation of suspensions
- RPF X16 rotary pressure filter with TwinDrive
The BHS rotary pressure filter (type RPF) is a continuously operating filter for pressure filtration, washing and drying of the generated filter cake. It is especially suited to processing volatile and hazardous substances, and to sterile processes.
The filter operates at a pressure of up to 7 bar (g). In all process steps, pressure is generated by feeding of the suspension and/or the washing and extraction agents and not by layers of gases. Depending on the design, numerous further process steps can be accomplished after the main solid-liquid separation. These processes include cake washing in one or multiple stages, displacement washing, counter-current washing, closed-cycle washing, reslurrying, solvent exchanges, steaming, extraction, etc. Subsequently, the filter cake can be dewatered mechanically, or, if desired, dried thermally. All process steps are performed in separate cells inside the filter. In this way, the filtrates can be drained off separately.
A simple integrated discharge system allows the filter cake to be discharged at atmospheric pressure directly to the downstream equipment. After automatic cake discharge, the filter cloth is cleaned. It is then ready for a new filtration cycle.
- B16 rotary pressure filter with spur gear drive
- Filtrate drainage pipes to the control head inside the filter drum
- Filter cake discharge area with open cover
Process criteria
The BHS rotary pressure filter works on the principle of cake filtration and can fulfill the following process criteria:
| Mode of operation | continuous |
|---|---|
| Operating pressure | up to 7 bar (g) |
| Operating temperature | up to 160 °C |
| Solids content (suspension) | up to 60 % (weight) |
| Cake thickness | up to 175 mm |
| Particle size | 10 - 500 μm |
| Filtration capacity (suspension) | up to 15 m³/m² h |
| Filtration capacity (dry solid) | up to 15,000 kg/m² h |
| Active filter area | 0.12 - 8,6 m² |
