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Pressure Leaf Filter

Pressure Leaf Filter
Why Choose Us?

Professional Team
Zhengzhou Loreek Machinery Equipment Co.,Ltd. is the professional manufacturer and service provider of filtration and separation equipment.


Overseas Market
Global service since 2012, Zhengzhou Loreek has supplied products and service to over 30 countries and areas excluding China mainland,Southeast Asia, West Asia, South Asia, Northeast Asia, Middle East, Europe, North America, South America , Africa, Oceania and so on.


Complete Range of Products
We mainly supply all kinds of filtration and separation equipment, such as pressure leaf filter, candle filter, press filter, vibrating separator etc.. and oil refining line, screening system and waste recycling line etc. projects.


Rich Experience
Our Core Team has over 30 years production and manufacturing experience in industrial filtration and separation equipment industry. Now we have two production bases located in central China area. Batch production and Integrated services could satisfy all kinds of market needs.

 

What Is Pressure Leaf Filter

 

Pressure leaf filters utilize the concept of cake filtration to deliver an economic and reliable solution for liquids with higher solid loads, between 0.01% – 3%. The system is comprised of a pressure vessel containing individual 'filter leaves' supported on a manifold.

 

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Advantages of Pressure Leaf Filters

High Flow Rates In A Compact Design: Pressure leaf filters operate at high flow rates and at pressures of up to four bars.


Robust Filter Leaves And Filter Mesh: Expect long life from the robust five layer stainless-steel wire mesh, delivering a low total cost of ownership with little maintenance.


High-efficiency: High filtration efficiencies are delivered, with or without use of a filter aid.


Flexible Design: The filtration area of pressure leaf filters is sized for your application. Vertical vessels are offered in filtration areas from 5m² to 125m².


Multiple Uses: Multiple filtration stages can be accomplished by changing out the filter leaves for coarser or finer mesh.


Quick Cake Discharge: Fast drying process minimizes liquid loss during cleaning cycles, while our air vibration system discharges the cake, quickly and easily.


Durable Design: To prevent damage during cleaning, unique u-shaped nozzle is enclosed within a manifold, creating a strong attachment with the tank, and allowing smooth flow. In addition, leaf handles are welded to the outside of the u-profile to prevent leakage if the handle is damaged.


Designed For Safety: The closed filter system ensures safe operating conditions even at high temperature and pressure.

 

 Leaf systems are available in both horizontal and vertical styles that can be used with both wet and dry cake discharge. Pressure leaf filters are offered with a variety of filter meshes to meet the needs of a range of fluid applications including edible oils, gelatin, liquid sulfur, and bio-diesel.

 

Pressure Leaf Filters Operation

 

Pressure leaf filters work by feeding a liquid (dirty influent) into a pressure vessel under pressure. The liquid passes through filter leaves leaving behind the solids in the form of a cake. The filtered liquid (filtrate, or clean effluent) exits the filter through the manifold connecting all the filter leaves. The filter cake is then discharged from the vessel either by sluicing with a separate liquid or as a dry solid via vibration.


● Cake Discharge Methods
Depending on how the solids need to be handled or the nature of the solids, the filter cake can either be discharged as a dry solid or as wet cake slurry.


● Dry Cake Discharge
To discharge the cake as a solid, a vibrating mechanism is used to shake the filter cake off of the leaves. In order for the cake to leave the vessel the shell must be retracted. A Quick Open Closure (QOC) is often used to make shell retraction safe and fast. Once the shell is open the cake is vibrated into a hopper for recovery or disposal.


● Wet Cake Discharge
When the solids are hazardous or easily disposed of in liquid form, the filter cake can be washed from the leaves and discharged. The sluicing system efficiently washes the cake from the leaves using nozzles on a rotating header.


● Semi-Automatic Pressure Leaf Filters
These filters feature a central control panel for sequence step activation. The various pump drives, agitator drives and valves are automatically activated to the required mode for the process step.


● Fully Automated Pressure Leaf Filters
These filters feature either touch-screen programmers or programmable controllers, which are used to ensure that each process step is activated automatically. Flow rate and turbidity may, if required, be monitored. Various options are available such as main panel graphics, manual overrides, alarms, remote terminal boxes, station wiring and completely piped and wired skid-mounted systems.

 

Pressure Leaf Filter – Component Breakdown

Filter Motor (PDF): Either an electric or a hydraulic drive can be specified in your design. The electric motor is driven by a Variable Frequency Drive (VFD). The VFD gives precise speed control of the nest rotation and offers programmable ramping speed control. High speed rotation is needed for cake discharge while low speeds aid the effectiveness of boil-outs and filter plate washing.


Upper Bearing (PDF): The upper bearing is installed above and separated from the upper seal. This arrangement protects the bearing from damage in the event there is a seal leak. The upper bearing uses two bearings working in tandem to allow smooth rotation of the filter shaft. There is a radial bearing for the lateral forces and an axial bearing that handles the thrust load of the weight of the filter nest.


Upper Seal (PDF): Designed to eliminate causes of failure, a key feature of the upper seal is the corrosion resistant bearing sleeve. The filter shaft fits inside of the bearing sleeve, riding on the sleeve instead of the shaft.


Filter Nest (PDF): The filter nest consists of a central manifold and the leaves of the filter. The leaves are typically constructed of stainless steel and outfitted with a sintered mesh or cloth fabric that provides the basis for filtration.

Lower Bearing (PDF)

The most commonly installed lower bearing consists of a bearing housing that is mounted onto the bottom end of the filter nest shaft, a PTFE sleeve that carries the radial loads of the bottom end of the filter shaft during rotation, and two lip seals that are installed in the bearing housing.

Discharge Valve (PDF)

Various types of valves can be used for solids discharge. The sliding action allows the end of the heel pipe to be installed very close to the face of the valve allowing for the filter to be completely drained of fluid before the discharge valve is opened.

Filter Housing (PDF)

The filter housing is critical in the design as it can be built to handle specific pressure requirements and be outfitted with heating/cooling options to meet process requirements. The filter housing also keeps the entirety of the process contained.

 

Crude Oil Filtration Pressure Leaf Filter
What Is the Working Principle of Pressure Leaf Filter

Pressure leaf filters are designed for final discharge of solids in either a dry or wet state, under totally enclosed conditions, with fully automatic operation.


Each type of pressure leaf filter features a pressure vessel in which are located one or more filter elements or leaves of circular or rectangular construction. The filter media may be in the form of a synthetic fibre or other fabrics, or metallic mesh. Supports and intermediate drainage members are in coarse mesh with all components held together by edge binding. Leaf outlets are connected individually to an outlet manifold which passes through the wall of the pressure vessel.


The material to be filtered is fed into the vessel under pressure, and separation takes place with the solids being deposited on the leaf surface, and the liquid passing through the drainage system and out of the filter. Cycle times are determined by pressure, cake capacity or batch quantity. Where particularly fine solids must be removed, a layer of precoat material may be deposited on the leaves prior to filtration, using diatomaceous earth, perlite, or other suitable precoat materials.


Cake washing, for recovery of mother liquor or for removal of solubles, may be carried out before discharge of the solids as a slurry or a dry cake.


Pressure leaf filters are supplied in a wide range of size and materials of construction. For sluice cleaning either a stationary or oscillating jet system using high efficiency spray nozzles is fitted so as to give complete cake removal. For recovery of dry solids, vibration of the leaves allows automatic discharge of the solids through a bottom discharge port provided with a quick opening door.

 

Troubleshooting Pressure Leaf Filters
 

Torn or bent filter leafs can be the result of excessive body feed or running the filter too long between cleaning cycles. Typically a rebuilt leaf is around half the cost of a new one.
Stop damaging your leafs by following these steps:

● Keep differential pressure at 25 to 30 PSI between cleaning cycles. Do not depend on a set time cycle.


● Cut back on the body feed.


● Only precoat the frames until the filter aid is ¼" thick.


● Check to see if your filter media has blinded.


● New door gasket is leaking. If a replacement gasket was cut with straight ends, it may not create a perfect seal. Cut another with angled ends and install.

 

Application of Pressure Leaf Filter

Pressure Leaf Filter is useful in multiple applications:


● Edible Oils – Crude Oil, Refined Oil etc.

Filtration of Carbon Black and Bleaching Earth in Edible Oil Processing.

Post Bleaching, Post Cooling Applications in Refinery

Hydrogenation, Winterization and Fractionation Processes

Glucose, Sugar, Fruit Juice.

Organic & Inorganic Salts, Amines, Resins, Bulk Drugs.

Chemicals and Oleo chemicals.

 

 
Our Certificate

 

Up to now, our company has passed BV Approval. And our products has obtained EU CE, and PED certificates.Excellent products is our brand; Attentive service is our work; Professional technique is our core. Loreek Products is your excellent Option.

productcate-1-1

 

 
Our Factory

 

Zhengzhou Loreek Machinery Equipment Co.,Ltd. is the professional manufacturer and service provider of filtration and separation equipment. Global service since 2012, Zhengzhou Loreek has supplied products and service to over 30 countries and areas excluding China mainland,Southeast Asia, West Asia, South Asia, Northeast Asia, Middle East, Europe, North America, South America , Africa, Oceania and so on. LOREEK Brand has been one excellent option in this industry.

productcate-1-1

 

 
FAQ
 

Q: What is the principle of pressure leaf filter?

A: Pressure leaf filters work by feeding a liquid (dirty influent) into a pressure vessel under pressure. The liquid passes through filter leaves leaving behind the solids in the form of a cake. The filtered liquid (filtrate, or clean effluent) exits the filter through the manifold connecting all the filter leaves.

Q: What is the use of pressure leaf filter?

A: Pressure leaf filter systems with dry cake discharge are used in a number of applications such as filtration of sugar, cocoa or edible oils, for the removal of activated carbon, molten sulphur filtration or catalyst recovery.

Q: What are the different types of pressure leaf filters?

A: There are two types of leaf filter vessel configurations: horizontal and vertical pressure filters. Horizontal pressure filters are the most commonly operated due to their ease of operation and cleaning. There are also more variations of horizontal pressure filters due to their operation and installation methods.

Q: How does a vertical pressure leaf filter work?

A: Each filter leaf is made of 3 or 5 layers of stainless meshes. The slurry is pumped under pressure in to the vessel. As the liquid passes through the wire mesh, the solids particles are trapped, while the filtered liquid called the filtrate, passes through into collection outlet (Manifold).

Q: Is the pressure blade filter good?

A: Pressure leaf filters are efficient, reliable, versatile, and environmentally sustainable, making them indispensable tools in industrial filtration processes. Enhance product quality, improve production efficiency, and meet regulatory standards, with these exceptional filters. Deliver consistent high-quality filtration results across numerous diverse applications.

Q: Is the pressure leaf filter powerful?

A: Robust Versatility: Vertical pressure leaf filters are commonly used in a variety of chemical and pharmaceutical industries and applications, making them the premier choice for filtration.

Q: What are the advantages of pressure leaf filters?

A: Large Scalable Filtration Area: The horizontal orientation (vertical stacking) of filter leaves provides a scalable surface area for maximum filtration efficiency.
Continuous, Contained Operation: The system can be designed to fill, filter, discharge, and wash without interruption to the filtration process.
Robust Versatility: Vertical pressure leaf filters are commonly used in a variety of chemical and pharmaceutical industries and applications, making them the premier choice for filtration.

Q: What is the function of a pressure filter?

A: Their task is to protect downstream hydraulic components such as servo valves from potential contamination that may occur in the hydraulic circuit. Due to their placement in the (high) pressure line - typically directly after the pump - they ensure the oil cleanliness necessary for trouble-free operation.

Q: How does a pressure leaf filter work?

A: Pressure leaf filters work by feeding a liquid (dirty influent) into a pressure vessel under pressure. The liquid passes through filter leaves leaving behind the solids in the form of a cake. The filtered liquid (filtrate, or clean effluent) exits the filter through the manifold connecting all the filter leaves.

Q: What is the principle of pressure leaf filter?

A: Unfiltered liquid is pumped into the filter vessel. Initially the filter aid starts forming a precoat layer on both sides of the filter leaves, until then cloudy material comes out of the filter.

Q: What aspect of pressure does the pressure leaf filterwork?

A: Pressure leaf filter works by feeding a liquid or dirty influent into a pressure vessel. This is done under high pressure. The liquid when passes through filter leaves leaves the solids behind in the form of a cake.

Q: What are the two types of pressure leaf filters?

A: There are two types of leaf filter vessel configurations: Horizontal and vertical pressure filters. Horizontal pressure filters are the most commonly operated due to their ease of operation and cleaning. There are also more variations of horizontal pressure filters due to their operation and installation methods. Vertical pressure filters are often used for small-flow, granular media filtration. Horizontal vessels are typical for larger flows because the horizontal layout increases the possible filtration area. With vertical pressure filters, it is possible to have multiple vessels in one system, whereas with horizontal pressure filters, it is possible to have different cells in the same vessel.

Q: What are the advantages of pressure leaf filters?

A: Large Scalable Filtration Area: The horizontal orientation (vertical stacking) of filter leaves provides a scalable surface area for maximum filtration efficiency.
Continuous, Contained Operation: The system can be designed to fill, filter, discharge, and wash without interruption to the filtration process.
Robust Versatility: Vertical pressure leaf filters are commonly used in a variety of chemical and pharmaceutical industries and applications, making them the premier choice for filtration.

Q: What are the characteristics of pressure leaf filter?

A: The pressure leaf filter is hybrid in design, and its efficiency prevents it from occupying too much space compared to the horizontal models. The filter leaves are housed within a cylindrical tank, restricting space use while enhancing filtration. This arrangement also makes it easier to improve the distribution and drainage of the slurries to make the operation efficient. The vertical construction usually employs a top agitator to similarize the slurry deposition and accelerate the formation of the cake. More so, these filters minimize cake discharge effort through gravity or any other vibratory means, improving maintenance and effort. The design addresses these issues since vertical pressure leaf filters are used to achieve high productivity where space is limited and where there is a need for continuous processing activities.

Q: What are the selection criteria for pressure leaf filters?

A: When minimum floor space is available. It is hanging type.
Where large filtration area is required.
When the liquids are volatile and may not be subjected to vacuum.
When high filtrate clarity is required.
When the cake may be discharged either dry or as a thickened slurry.
Used for filtration of liquids with ~7% suspended solids.

Q: How to filter with pressure leaf filter?

A: The sufficient formation of the cake on the filter elements is noticeable by the pressure increase and during the visual inspection. The duration of the filtration phase and the quantity of oil are determined by several influencing variables:
Oil temperature, which is decisive for the kinematic viscosity
Amount of sediment/particles in the oil
Particle size distribution of the cake – a variable which is strongly dependent on the operation of the oil press
Type and quantity of filter aids used (sawdust, cellulose…)
Filter surface

Q: Is the operation of the pressure leaf filter based on the principle of cake filtration?

A: The filter elements (filter leaves) consist of a frame covered with a fine-mesh metal net. Several filter leaves are arranged in the filter housing on the discharge pipe. The filter housing is filled with turbid oil under pressure. The oil penetrates through the surface of the filter elements into the interior of the frame and flows through the discharge pipe. The cake and filter aids collect on the surface of the filter leaves.This phase is called cake pre-coating. During cake pre-coating, the oil is returned to the unfiltered oil tank. Only when a sufficiently thick layer of filter cake has formed on the surface of the filter leaves can the filtered oil be diverted into the clean oil tank. This process can be accelerated by using filter aids.

Q: What is pressure leaf filter?

A: Pressure leaf filters utilize the concept of cake filtration to deliver an economic and reliable solution for liquids with higher solid loads, between 0.01% – 3%. The system is comprised of a pressure vessel containing individual 'filter leaves' supported on a manifold.

Q: What is the function of a pressure leaf filter?

A: The material to be filtered is fed into the vessel under pressure, and separation takes place with the solids being deposited on the leaf surface, and the liquid passing through the drainage system and out of the filter. Cycle times are determined by pressure, cake capacity or batch quantity.

Q: How to operate the pressure leaf filter?

A: Pressure leaf filters work by feeding a liquid (dirty influent) into a pressure vessel under pressure. The liquid passes through filter leaves leaving behind the solids in the form of a cake. The filtered liquid (filtrate, or clean effluent) exits the filter through the manifold connecting all the filter leaves. The filter cake is then discharged from the vessel either by sluicing with a separate liquid or as a dry solid via vibration.

As one of the most professional pressure leaf filter manufacturers and suppliers in China, we're featured by good service and competitive price. Please rest assured to buy high quality pressure leaf filter for sale here from our factory.

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