JET FILTER

Handling, transferring, or processing bulk solids in powder or granule form often generates dust particles that become airborne. These emissions pose serious health risks to workers, contribute to environmental pollution, and can disturb the efficiency of equipment. Effective dust control is essential not only for meeting safety and environmental regulations but also for ensuring smooth and reliable operation across industrial processes.

Jet filters, also known as jet pulse filters, are among the most reliable and efficient solutions for dust collection in bulk material handling systems. By continuously capturing and containing airborne particles, jet filters play a critical role in protecting worker health, improving air quality, and ensuring compliance with industry standards and environmental regulations.

Storage silos, pneumatic conveying systems, mechanical conveyors, production lines, and loading or discharging points are key areas where dust is generated during the handling of bulk solids in powder or granular form. Each system presents different challenges depending on how materials are conveyed and processed.

A wide selection of filters and dust collection systems is available for effective dust management in bulk solid handling. The selection depends on the physical properties of the dust—such as particle size, moisture, and abrasiveness—as well as the specific characteristics of the handling process. Choosing the right system is essential for maintaining clean operations, protecting worker health, and ensuring compliance with environmental regulations. Polimak’s jet filter solutions are designed to deliver efficient dust collection across a range of industrial applications, ensuring reliable performance even in demanding environments.

Operating Principle of Jet Pulse Filter

• Air Transfer: The filter unit receives dust-filled air transported by pneumatic or mechanical conveying systems using pressure or vacuum methods. This process ensures that dust particles are effectively captured before the air is released.

• Dust Capture: Filter cartridges or filter bags capture dust particles while allowing conveying air to pass through. These filters are designed to trap even the finest particulate matter, ensuring high filtration efficiency.

• Filter Cleaning: A reverse air jet pulse system periodically sends pressurized air in the opposite direction to clean the filters. This cleaning cycle prevents clogging and maintains consistent airflow through the filter media.

• Dust Disposal: Dislodged dust is either returned to the process or collected in a separate hopper. Proper dust collection minimizes waste and helps maintain a clean working environment.

• Clean Air Release: Clean air is discharged back into the environment or system. This ensures compliance with environmental regulations and improves workplace air quality.

• System Components: The reverse air pulse jet system includes pulse jet diaphragm valves, a pressurized air tank, injection nozzles, and an electrical controller. These components work together to automate the cleaning process and optimize filter performance.
Various types of powdered and granular bulk materials can be effectively filtered by selecting the appropriate dust collector. This ensures that emissions of fine dust and raw food materials are properly controlled. The right dust collection system can also handle large granular products without compromising efficiency. We can also design systems to safely manage hazardous materials, including explosive or high-temperature substances. Efficient filtration helps protect both the environment and workplace safety across a wide range of industries.

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A rotary feeder is a type of valve whose primary function is to feed or meter dry bulk solids from an upstream device to a downstream device without necessarily maintaining a pressure differential. An airlock feeder, on the other hand, is a valve that separates a pressure differential while feeding or metering dry bulk materials into a downstream system.

The blades of a rotary valve rotate inside the valve housing during operation. This rotation is driven by a motor. As the motor rotates, the rotor pockets move through the valve. Dry bulk solids are supplied to the valve from upstream equipment through its inlet and settle in the pockets. The rotor continues to rotate and discharges the dry bulk solids through the outlet port. There are two types of rotation: load side rotation and return side rotation. Load side rotation is defined as the movement of the rotor pockets from the inlet to the outlet, while return side rotation refers to the movement of the rotor pockets from the outlet port to the inlet port.

Rotary valves are used in several industries for various industrial applications. They are used for different purposes, including controlling the flow of dry bulk solids, feeding downstream systems, and maintaining a pressure differential between an upstream device and a downstream device.
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During the handling of bulk solids in powder or granule form, dust may be released into the atmosphere, which is harmful to both health and the environment. Dust collection systems and jet pulse filters are used to prevent these emissions from industrial processes.
Storage silos, pneumatic conveying systems, mechanical conveying systems, production lines, and loading and discharging systems are key areas involved in handling powder and bulk solids. A wide range of filters and dust collection systems are available, depending on the physical properties of the dust and the characteristics of the bulk solid handling process.

Operating Principle of Jet Pulse Filter

Depending on the design of pneumatic or mechanical conveying systems, air with dust content is transferred to the filter unit by pressure or vacuum. Filter cartridges or filter bags capture the dust particles and allow the conveying air to pass through them. The reverse air jet pulse system is used to blast pressurized air in the reverse direction to clean the filters periodically. The dust is either returned to the process or stored in a separate hopper, while clean air is discharged. The reverse air pulse jet system consists of pulse jet diaphragm valves, a pressurized air tank, injection nozzles, and an electrical controller.

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Bulk Materials Handled by Bin Activators

Starch
   
Minerals
  
Coffee Powder
Spices
  
Limestone
  
Copper Oxide
Cement
  
Salt
  
Sugar
  
Sand
  
Calcium Carbonate
Alumina
  

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Advantages & Key Benefits of Bin Activators

Polimak’s bin activators are available in a wide range of models designed to handle various types of dry bulk materials stored in vessels of different capacities. They offer numerous advantages to user industries. Some key benefits of our bin activators include:

•Depending on the type of dry bulk material handled, our vibrating bin dischargers are manufactured from:

       o Carbon steel

       o Stainless steel

       o Other specialized steel types

• Complete resilience to the vibrating dish head, provided by special spring suspensions.

• Flexible seal connections at the inlet and outlet to ensure secure and safe connections.

• Excellent performance with low energy consumption.

• Easy installation and low maintenance.

• High operational efficiency.

• A housed motor within a single-seal enclosure for added protection.

• Smooth and reliable material discharge

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• A bin activator is a piece of equipment with a tapered conical design that promotes bulk material flow from storage silos or hoppers.
• It induces motion through generated vibrations to prevent material blockages.
• During operation, it exhibits a gyratory motion, which is transmitted to the dry bulk material in the silo.
• This motion ensures smooth and consistent material flow into downstream equipment.

• The bin activator functions on the principle of convergence due to its conical shape.
• During discharge, bulk solid material moves from the larger-diameter inlet to the smaller-diameter outlet of the bin activator, transferring material from upstream equipment (such as a silo or bin) to downstream equipment (such as a feeder or container).
• Mild vibrations generated by the synchronized vibrator and motor are transmitted to the dry solid material inside the silo, ensuring a smooth material flow through the bin activator into the connected unit.
• The system’s vibration levels can be easily adjusted.
• The motor is housed in a single-seal enclosure with no belts to slip or break.
• This enclosure prevents oil leakage, thereby eliminating the risk of material contamination.
• Positive discharge is achieved if the outlet is sufficiently large and there is no downstream equipment obstructing the bulk material flow.
• Additionally, a secondary baffle can be used to prevent jamming and compacting of the bulk material at the outlet.

• Flowability is a property of bulk materials that defines their ability to move smoothly from storage containers like silos or bins.
• It measures a particle’s freedom of movement when subjected to a force, such as gravity.
• The flow characteristics of dry bulk solids vary and can be classified based on their flowability:
       o Free-flowing
       o Average-flowing
       o Sluggish
• Free-flowing bulk solids consist of particles with low strength, meaning they offer minimal resistance to movement relative to each other and can move independently with ease when in motion.
• As particle resistance to movement increases, bulk material flow is affected, leading to classifications such as average-flowing and sluggish dry bulk solids.
• Loss of material flow from storage containers is typically caused by two common bulk material flow problems:
       o Bridging (arching)
       o Ratholing

Bridging and arching both describe the formation of an arch-shaped profile above the outlet of a storage container, which blocks the flow of dry bulk solids.
• In fine-grained bulk materials, bridging occurs due to the strength of the bulk solid, caused by adhesion forces acting between particles.
• In coarse-grained bulk solids, arching occurs due to particle interlocking and wedging.
Ratholing describes a funnel-shaped contour formed by bulk materials inside storage containers. This occurs when bulk solids empty only through the central flow channel above a silo or bin outlet, driven by the material's strength.

There are several methods to resolve bulk material flow difficulties in storage containers. A wide range of flow aids can be customized for new or existing containers to address various bin flow challenges. Options such as bin activators, storage container design modifications, and air fluidizing nozzles help improve bulk material flow and prevent arching and ratholing problems.
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Jet Filter Models Polimak jet filters are designed for a wide range of applications, offering efficient dust collection and filtration solutions across various industries. They are commonly used in pneumatic conveying systems, silo filling by bulk truck, silo and hopper filling with mechanical conveyors, mixer filling, packaging systems, bulk truck, tanker truck, ship and stockpile […]

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Jet Filter Models Polimak designs and manufactures a wide range of filter models to suit various process features and requirements. The choice of filter depends on the specific application, such as silo ventilation, mechanical conveyor systems, or pneumatic transportation systems. Choosing the right model is also based on the type of bulk material being transferred, […]

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Explore how Polimak's custom-designed bulk material handling systems offer seamless storage, transport, and processing solutions. With over 40 years of industry experience, our focus on R&D and safety ensures that you meet your toughest challenges efficiently.
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Our Engineering, Your Success… DISCOVER OUR PRODUCTS OUR PRODUCTS Explore our wide range of versatile bulk material handling machinery. Explore our wide range of versatile bulk material handling machinery. View all Rotary Valve A rotary valve, also known as an airlock feeder or airlock valve, is a piece of bulk material handling equipment used to […]

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OVER 40 YEARS OF SERVICE About Us Polimak is a leading engineering and fabrication company, specializing in bulk solids handling technologies for over four decades. Our wide range of versatile bulk material handling machinery is appropriate for value-added logistics as well as handling powders, granules and pellets in the food, chemical, plastics, minerals, and agriculture […]

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SHAPE THE FUTURE Career We are an internationally and rapidly growing dry bulk solids handling equipment and systems supplier which reckons that one of the key elements to success is acquiring a passionate, talented and diverse workforce. At Polimak, we work hard to establish an environment for our employees that delivers thought-provoking objectives, thus fostering […]

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Products Explore Our Wide Range of Versatile Products At Polimak, we offer a diverse selection of cutting-edge bulk solids handling machinery. Our products are designed to meet the unique needs of various industries, including food, chemical, plastics, minerals, and agriculture processing. From efficient logistics solutions to heavy-duty industrial applications, our exceptional range of products ensures […]

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These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
Installed below silos or hoppers, these valves are used for maintenance operations of equipment such as rotary valves, screw feeders, etc., that are positioned below the butterfly valve.
These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
In this design, the butterfly valve is sandwiched between two flanges. Rubber sealing at both faces of the valve provides a tight seal between the flanges and the wafer butterfly valve.
One side of the valve has a bolted flange connection, while the other side features a built-in short pipe designed for fixing a flexible sleeve.
These valves have bolted flange connections on both sides, making them suitable for installation on silos, hoppers, screw feeders, and similar applications.
Bulk tanker trucks or open trucks can be filled with powdered materials delivered within FIBC bags. These systems generally consist of bulk bag discharging station, mechanical or pneumatic conveyor and loading bellow. Big bag discharge station transfers the bulk solid from big bag to conveying system. Conveying system transfers it to truck loading area. And loading bellow is used to fill tanker truck without any dust emission. Since truck loading operations are done within limited time, high capacity big bag discharge systems and bulk material conveying systems are used. For short distances, screw conveyors are preferred to transfer material from big bag discharge station to truck loading chute. For long conveying distances, pneumatic conveying systems provide better service. There may exist a storage hopper or silo above bulk truck loading bellow to compensate material flow between inlet and outlet. Bulk bag discharge and truck filling systems have automatic control system that monitors product level in truck and operates all equipment accordingly. Optional weighing system can be added to measure the amount of material that is filled to truck.
Big bag discharge systems can deliver dry bulk solids in powder and granular form to weighing and batching systems. The loading hopper of the weighing system should remain full during dosing and batching. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the dosing speed and conveying distance, mechanical conveying systems or pneumatic loading systems may be used. Dust collectors can be employed to prevent dust emissions during hopper loading, especially for materials with high dust content.
Dry bulk packaging systems are used to fill powdered or granular materials into bags, drums, jars, sacks, etc. Bulk materials delivered in big bags must be transferred to packaging machines without interruption. The loading hopper of the packaging system should remain full during the filling and packaging process. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the packaging speed, mechanical conveying systems or pneumatic loading systems can be selected. Dust collectors can be used to prevent dust emissions during hopper loading, especially for materials with high dust content.
Mixer automation systems are used to mix dry bulk solids according to specific recipes. Raw materials delivered in FIBC bags can be transferred to mixing units through a combination of conveying equipment and bulk bag discharge systems. Depending on the type of application, pneumatic conveying or mechanical feeding systems can be used to fill mixers. Big bag discharge stations can be manufactured with built-in dosing systems. The amount of raw material to be loaded into the mixer is automatically controlled with the help of a weighing and dosing system. Dust collectors can be used to prevent dust emissions during the mixer filling process.
Bulk material stored in big bags can be automatically filled into small bags. Big bag discharge systems come with optional built-in bag filling units. For low filling capacities, these units are installed below the big bag discharge hopper, providing a practical and cost-effective solution. Both big bag discharging and bag filling operations can be handled by a single, compact system. For higher bag filling needs, bag filling machines are installed near the bulk bag discharge stations. Pneumatic conveying systems or mechanical conveyors can be used to transfer bulk material from the FIBC bag discharge station to the bag or sack filling system.
Mechanical conveyors can be used for silo loading from big bag discharge stations. Screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to big bag discharge stations to fill silos. The selection of conveying equipment directly depends on the conveying distance, height, transferred material, and capacity. Bucket elevators are preferred for high silos, while screw feeders are preferred for shorter silos and short distances. The big bag discharge system can be installed on top of the silo for faster filling. In this case, rotary valves or butterfly valves are better choices as they provide simple flow control. Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air content in the silo escapes to the atmosphere and carries some dust along with it. Vacuum fans and jet filters in dust collectors prevent dust emissions into the environment. The collected dust is sent back to the silo, thus preventing product loss.
Pneumatic conveying systems installed after bulk bag discharge units transfer bulk material through conveying pipelines to fill silos. This configuration is useful in applications where high transfer rates and long conveying distances are needed. In production lines where raw materials are stored in warehouses far from storage silos, bulk bag discharge stations can be installed close to the warehouses, and pneumatic conveying systems are used to fill silos from long distances. This design reduces the need for forklifts and cranes for bulk material transfer on the production site and increases overall efficiency.

Pneumatic conveying systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Pneumatic conveying systems installed after bag dump units transfer bulk material through pipelines to fill silos. This configuration is ideal for applications requiring high transfer rates and long conveying distances. In production lines where raw materials are stored in warehouses far from storage silos, bag dump stations can be installed close to warehouses, allowing pneumatic conveying systems to transport materials over long distances. This design reduces the excessive use of forklifts and cranes for bulk material transfer within the production site, improving overall efficiency.

Pneumatic transfer systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on factors such as the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Mechanical conveyors can be used for silo loading from bag dump stations. In this configuration, screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to bag dump stations to fill silos. The selection of conveying equipment depends on factors such as conveying distance, height, material properties, and capacity. Bucket elevators are preferred for high silos, while screw feeders are ideal for shorter silos and short distances. Bag dump systems can be installed on top of the silo for faster filling. In such cases, rotary valves or butterfly valves are better choices as they provide simple flow control.

Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air inside the silo escapes to the atmosphere, carrying dust particles with it. Dust collectors equipped with a vacuum fan and jet filter capture airborne dust. The collected dust is returned to the silo, preventing product loss and ensuring a cleaner environment.
The inlet skirt is an optional feature designed to extend the lifespan of the flexible connector sleeve. Its upper portion is attached to the outlet port of the upstream equipment and extends down into the bin activator’s inlet port. The primary function of the inlet skirt is to serve as a protective shield, safeguarding the flexible connector seal from wear and damage.
A vibratory motor is externally mounted to the bin activator. When powered, the motor generates vibrations that facilitate a steady flow of dry bulk materials within the system. Depending on the application requirements, one or two vibratory motors can be installed externally.
To accommodate a bin activator, the cone of a silo must be shorter than usual, resulting in a wider outlet. A flange supplied with the bin activator is separately welded to the silo’s outlet, slightly above the opening, at the production site. Once installed, the vibrating bin discharger is securely bolted to the flange, ensuring a stable and reliable connection.
Special spring suspension links and an engineered polymer seal work together to create a flexible connection between a vibrating bin discharger and the equipment positioned above it.

The proper design and installation of the polyurethane seal prevent it from slipping off and ensure a secure seal, eliminating the risk of dry bulk material leakage. Additionally, the seal offers high stress resistance and long-term durability, withstanding stresses caused by motor vibrations, pressure conditions, and other operational factors.

Externally installed spring suspensions provide full resilience to the vibrations of the cone head. They ensure that the generated vibrations affect only the cone itself rather than the upstream equipment structure.
An internally tapered, conical-shaped baffle plate is positioned at the center of the bin activator’s diameter. The baffle is rigidly attached to the equipment body using structural steel components. It facilitates bulk material flow from upstream equipment by directly inducing vibrations into the material.

A secondary deflector plate reduces the weight of the bulk material in the lower portion of the bin activator by acting as a wedge beneath the material, directing it around the areas adjacent to the cone’s surface.

Polimak baffle plates are available in various configurations, including convex and cone plates, and in different angles (15°, 30°, 45°, or even 60°) depending on the flow characteristics of the handled bulk material and the specific application requirements.