Filter Systems

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.

               For oil refinery                              For sulfuric acid production                  For vegetable oil primary processing

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.

Vertical pressure leaf filters 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.

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.

 Vertical pressure leaf filters Structure

A 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 a 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 100mm  
For wet cake discharge, with or without water spray nozzles are provided.