Vertical Pressure Leaf Filter

Vertical Pressure Leaf Filter for High Flow Fluid with Low Solid Content

Vertical pressure leaf filters are your ideal choice for batch process applications requiring high flow rates in a small footprint. As a result, it is suitable for places where the space is limited or interrupted flow is expected. In addition, we also offer horizontal pressure leaf filters to meet different industrial demands.

  • No filter cloth is required. Filter leaves are made of 5 layers of stainless steel wire screen and enjoy a long service life and a low maintenance cost;
  • Fully closed structure and fully automated operation reduce environmental pollution and labor costs;
  • A variety of filter aids can be added and the filter area ranges from 3 m2 to 125 m2;
  • The filter can operate in both dry and wet cake discharge modes to meet the demand of different industrial production;
  • It applies to batch process applications requiring high flow rates and small solids removal in a small footprint and offer a filter area of up to 100 m2.
Vertical pressure leaf filter
Structure
  • Vertical pressure leaf filter consists of a filter housing, filter leaves, a top cover, a vibrator assembly, a cake discharge nozzle and a manifold. The filter housing is provided with an inlet, an outlet, a davit arm, a butterfly valve, etc.
  • In the filter, filter leaves are evenly placed. At the bottom, filter leaves are inserted into the manifold that collects the filtrate. At the top, filter leaves are clamped by leaf clamping bar with spacer rings to make the filter leave easy to install and remove.
  • The spacing between filter leaves ranges from 30 mm to 100 mm.
  • For wet cake discharge, with or without water spray nozzles are provided.
Working Principle

First, precoat is applied before filtering. Agitate precoat tank containing filtrate and filter aid (diatomaceous earth, perlite, etc.) for around 10 minutes. Then, fill the vessel with the mixture, empty all the air, and pressurize the vessel. The precoat runs for 15 minutes at a fluid rate around 30–60 gallons per square foot per hour.

After precoating, slurry is forced through the vessel under pressure. Solid particles are trapped in the precoat, or filter media while clarified liquid flowing out of the filter through the manifold.

Choose whether to dry filter cake as needed. If you need dry cake, compressed air, inert gas or steam is commonly used for cake drying before discharging. After drying, filter cake is discharged by a pneumatic vibrator through a butterfly valve located at the bottom of the filter. Wet cake may be discharged by a pneumatic vibrator or spray nozzle.

Vertical pressure leaf filter structure diagram
Wet or Dry Cake Discharge

When filter cake needs to be recycled or disposed as solids, you may choose dry cake discharge, for example, sugar, cocoa or edible oil filtration, activated carbon removal, molten sulphur filtration or catalyst recovery. Compressed air, inert gas or steam is commonly used for cake drying before discharging.

If the cake formation is too low for dry discharge, the disposal is cheap (regeneration for wet discharge is shorter) or the cake needs to be transported via a pump, you may choose wet cake discharge, for example, saline water filtration.

Specification
  • Housing material: carbon steel, stainless steel
  • Filter element material: stainless steel
  • Design pressure: -1/6 bar (g) (-14.5/87 psig)
  • Design temperature: 0/150 °C (32/302 150 °F)
  • Maximum allowable pressure drop: 4.5 bar (65 psi)
  • Gasket material: VITON, EPDM, NBR, silicone rubber, etc.
Specification of Vertical Pressure Leaf Filters
Model Filter Area Cake Volume Filter Leaves Filter Volume Leaf Spacing Floor Space Height Weight (empty)
m2 dm3 dm3 mm mm mm kg
1 1.65 35 5 210 70 1220 × 1100 2110 350
2 2.2 50 5 320 70 1320 × 1300 2210 400
3 3 70 3 600 70 1340 × 1540 3020 550
4 5 105 5
5 7 135 7
6 5 110 5 800 70 1750 × 1090 3090 650
7 7 155 7
8 9 175 9
9 8 175 7 1000 70 1190 × 1230 3190 800
10 10 220 9
11 12.5 275 11
12 15 330 9 2000 70 2370 × 1680 4000 1100
13 17.5 385 9
14 20 440 11
15 23.5 520 11 2500 75 2210 × 2650 4100 1725
16 25 550 11
17 27 590 13
18 30 660 15
19 30.5 670 11 3600 75 2900 × 2110 4500 1980
20 35 770 13
21 38.5 850 15
22 42 920 13 4500 75 3110 × 230 4880 2300
23 46 1010 15
24 50 1100 17
25 55 1210 15 4900 75 3110 × 2350 5180 2500
26 60 1320 17
27 70 1540 16 6300 75 3770 × 2640 5650 3200
28 78 1720 18
29 85 1870 16 8200 75 3440 × 3890 3000 4400
30 100 2200 20
Application

Pressure leaf filters are a closed type automatic solid-liquid separation device and can work with variety of filtering aids. They apply to decolorization and filtration, pharmaceutical oil filtration, crystallization separation process, etc. in the production of oil and grease and chemicals and are mainly used in the following industries.

Food & beverage. Edible oil coarse filtration, bleached oil filtration, gelatin, vinegar, starch, sugar juice, sweet water, etc.; beer, juice, wine, milk, etc.

  • Petrochemicals. Diesel oil, lubricating oil, petroleum wax, mineral oil products, etc.
  • Fine chemicals. Resins, varnishes, dyes, lacquers, etc.
  • Organic chemicals. A variety of organic acids, alcohols, benzene, aldehydes, etc.
  • Inorganic chemicals. Bromine water, potassium cyanide, fluorite, etc.
Vertical pressure leaf filter used in vegetable oil primary processing plant.

For vegetable oil primary processing

Oil refinery workers are installing the vertical pressure leaf filter.

For oil refinery

Vertical pressure leaf filter used in sulfuric acid production.

For sulfuric acid production