Pressure Plate Filters

Process Engineering
Pressure Plate Filters

Description

The BHS Pressure Plate Filter provides for thin-cake batch filtration, cake washing, drying, reslurry and automatic cake discharge as well as heel filtration in a pressure vessel. Cake can be discharged as dry cake, wet cake or a concentrated slurry. Units are available from 0.35 m² to full production models. Pressure Plate Filters are installed for clarification and recovery applications from liquids with low solids content ranging from 5% to PPM levels.

The BHS filter plates are sloped and formed into a plate-stack which eliminates the bypass of solids or liquids. For cake discharge, two motors, typically 1 HP or less, gently vibrate the plate stack causing the solids to move along the plates to the vessel wall and out of the bottom. The BHS design eliminates rotating plates, gear boxes, and mechanical seals for a low-maintenance operation.

Materials of construction are stainless steels and alloys. The filter media is a synthetic polymer or metal with a clean removal efficiency to 0.5 microns. As the cake builds up, removal efficiencies improve to less than 0.5 microns. Filter aid and activated carbon can also be used.

Application Data Sheet

Animation

Complete Process
Precoating
Filtration
Cake Washing
Dewatering
Cake Discharge

Complete Process

Precoating

Filtration

Cake Washing

Dewatering

Cake Discharge

Highlights

Horizontal Filter Plates

Through the horizontal orientation of the filtration surface, the filter cake remains supported against the forces of gravity. This is advantageous when filtering batches with varying suspended solids concentration which may allow for multiple filtration campaigns prior to cake discharge.

Solids Discharge by Vibration

Vibration motors with low drive power assist with cake discharge. This is a significant advantage over other designs that require more energy to generate rotary motion of the filter nest. Additionally, there’s no need for a complex and expensive sealed shaft system that passes through the pressure vessel. The simple design results in lower energy and maintenance costs.

Modular & Turnkey

BHS has developed a modular system of turnkey filtration plants using pressure plate filters. The advantages of these system solutions include short delivery times and low installation costs on site. The modules are designed to facilitate transport to the construction site in containers at a low cost.

Technical Specifications

Performance Data, Dimensions, and Weights

Type	Plate diameter	Filter area/plate	Number of plates	Active filter area	Vessel diameter
PF 04	400 mm	0,11 m²	3 – 6	0,33 – 0,67 m²	550 mm
PF 07	760 mm	0,42 m²	4 – 15	1,7 – 6,3 m²	1.000 mm
PF 10	1.010 mm	0,78 m²	7 – 30	5,5 – 23,4 m²	1.300 mm
PF 14	1.440 mm	1,5 m²	16 – 30	24 – 45 m²	1.800 mm

All specifications apply to the standard version.

Technical data for customized designs may differ from the specified data.

All technical data may change due to development.

Subject to modification without notice.

Operating Criteria

Operating method	intermittent
Operating pressure	up to 10 bar (g)
Operating temperature	up to 250 °C
Solids content (suspension)	up to 10 % (by weight)
Cake thickness	up to 60 mm
Grain size	from 0,5 µm
Filter output – suspension	up to 4 m³/m² h
Filter output – dry solids	–
Active filter surface	0,35 – 45 m²