Pressure Plate Filter

Description

The pressure plate filter of type PF is a filter that operates in a discontinuous manner. The plate-shaped filter elements are arranged as a plate stack in a pressure vessel. The process steps typically performed with this unit are filtration, washing, drying and discharge. All these steps take place under pressure.

The filter is used primarily for cake-forming solid-liquid separation of suspensions with a low solids content that are moderately or very difficult to filter. It is also suitable for adsorptive filtration (as a deep bed or precoat filter). The pressure plate filter is frequently used for clarifying filtration. It is a compact unit, operates fully automatically and delivers high throughput rates.

Versatile technology solutions
In order to meet the respective process engineering requirements, the filter cake can be treated in many ways. It can be washed once or several times. To achieve further dehumidification of the filter cake, it is possible to pass air, nitrogen or other gases through it. If necessary, precoat filtration can be performed using filter aids.

Vibration discharge
The filter cake can be discharged either as sludge or dry matter. The whole plate array, including the hollow shaft and drive head, is mounted elastically on an elastomer ring that does not come into contact with the product. The entire array is set into defined rotary and vertical vibrations by means of two unbalanced motors. This causes the filter cake to tear open and fall from the filter plate in a spiral pattern.

Safe pressure filtration system
The entire filtration process takes place under pressure – up to a differential pressure of 10 bar g – in a closed, gas-tight system. This enables the use of BHS pressure plate filter even under stringent safety or hygienic requirements. Products can also be processed in an inert or sterile atmosphere. Sealing of the filter vessel against the vibrating plate array is achieved by means of a static sealing sleeve made of elastomer or PTFE.

Fully automatic operation
The pressure plate filter works fully automatically. At the end of a process cycle, the filter cake is ejected through vibration of the plate array. After the cake is discharged, the next cycle commences.

Plate array and cake formation
The individual filter plates comprise slightly conical stainless steel discs. A coarse-meshed supporting fabric covers the surface. It serves as a support for the actual filter fabric. The filter cake builds up on the filter fabric. Due to the applied pressure difference, the clear filtrate flows into the area of the supporting fabric and on to the central collection pipe. The plates are connected to one another by means of specially toothed connecting hubs, which are tightened positively via tie rods. The filter fabric is attached to the hub seal on the shaft side and to the plate edge via a clamping ring.

Shaft seal
The hollow shaft of the BHS pressure plate filter is sealed toward the pressure vessel by a static, radially acting sealing sleeve. Compared to dynamic solutions, this static sealing of the processing space offers a very high level of plant safety even under demanding operating conditions.

Residue-free filtration
After a filtration cycle, the residual volume in the lower part of the tank is pressed down via the tank discharge pipe using compressed gas. Additional filter plates with reduced diameters can be used to reduce the residual volume in the tank cone. An additional filter cylinder can be flanged to the lower end of the tank to affect almost complete residual filtration. Please contact us for a wholesale price.