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.

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.

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Manifold installed inside the vertical pressure leaf filter

Clamping bar without water spray nozzles is installed inside the vertical pressure leaf filter

Clamping bar with water spray nozzles is installed inside the vertical pressure leaf filter

Filter leaves for vertical pressure leaf filter

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)
Model	m²	dm³	Filter Leaves	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	4900	75	3110 × 2350	5180	2500
27	70	1540	16	6300	75	3770 × 2640	5650	3200
28	78	1720	18	6300	75	3770 × 2640	5650	3200
29	85	1870	16	8200	75	3440 × 3890	3000	4400
30	100	2200	20	8200	75	3440 × 3890	3000	4400

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