Tower press filter

Working principle:
Filtration (separation of suspensions into two phases - liquid and solid). The press filter is a cyclic action technological unit, the main element of which is a package of filter plates mounted on a frame.

Objects of application:
The filters are used to filter a wide range of suspensions, and they are also suitable for separation of suspensions with a small concentration of solid particles and suspensions with elevated temperature, the cooling of which is inadmissible due to the precipitation of crystals from the liquid.

Advantages:

1. Carrying out filtration, washing and air blowing processes in one apparatus in automatic mode according to algorithms laid down in advance in the software
   
2. Minimal time of auxiliary operations (regeneration of filter cloth and unloading of dewatered cake are combined in one operation)
   
3. Filtration of suspensions in a wide range of solid particle sizes: from fine particles (less than 40 microns) to several millimeters and with different solid/liquid ratios.
   
4. Due to the horizontal positioning of the filter plates, the filtering process is carried out under optimal conditions due to the coincidence of the direction of gravity and filtrate movement.
   
5. Uniform filling of the chamber
   
6. Possibility to regulate the cake thickness in a wide range, respectively the cake moisture;
   
7. Possibility to wash the cake if necessary;
   
8. Complete discharge of the cake is guaranteed;
   
9. Depending on the operational requirements, the material of construction can be flexibly selected from carbon steel to stainless steel;
   

Efficiency:

Main technological stages of filtration:

1. Filtration

The process slurry is pumped simultaneously into all filter chambers. A sluge begins to form while the filtrate is displaced by the next slurry entering the chamber. As the cake forms, the injection pressure is increased and the filtrate is forced through the fabric until the desired cake thickness is reached.

2. Pressurization

High-pressure water or air automatically fills the supradiaphragm space at the top of each chamber, reducing chamber volume and compressing the cake to remove more filtrate. This cake filtration process and tightly woven filter cloth results in exceptionally clean filtrate, with high pressure maximizing filtration efficiency. Diaphragm squeezing produces a homogeneous dewatered cake of uniform thickness with minimal residual moisture, which facilitates water washing and air blowing.

3. Cake flushing (optional).

Flushing fluid is fed through the slurry pipe to flush the solid cake, removing dissolved solids from the cake.

4. Re-pressing. (optional)

Re-pressing forces the washing liquid evenly through the cake layer and removes it.

5. Blowing with air

Compressed air is blown through the cake for final dewatering. The moisture content is minimized. This process can be very precisely controlled by varying the pressure and duration of the blowing.

6. Unloading the cake and rinsing the fabric

After opening the plate pack, the dewatered cake is removed from each chamber by means of a movable filter cloth. An integrated high pressure rinsing unit sprays liquid on both sides of the cloth, minimizing clogging and ensuring uniform filtration.

Labeling:

БПФ    Tower press filter (Башенный пресс-фильтр)

БПФ-100   filtering area, m2

Equipment Options:

1. Sensors:

2. Tank for separation of air and filtrate.

3. pulp preparation tank with agitator

4. Pumping equipment

5. Compressor station