Dust Collection and Valves Blog

A Simple Way to Check Airflow in Your Dust Collection System | Aerodyne

Posted by Tom Hobson on Nov 19, 2019 9:30:00 AM

Dust collection systems require the proper airflow to be operating correctly.  If not enough air is going through the system, dust isn’t being properly removed from the collection points and the dust collection equipment (baghouse, cartridge collectors, cyclones, etc.) might not be operating correctly.  However, if too much air is being pulled through the system, a variety of issues might ensue, such as product being lost, removal efficiency lowered, utility usage increased.

Conventional Way to Measure Airflow

The normal way to measure airflow is to insert a pitot tube in the ductwork to measure the air velocity in an airstream, and then calculate the velocity (and airflow).  This is a manual process that requires a trained individual.  It is time consuming and to a certain degree an art, since the velocity in a ductwork changes depending how close to the wall you are.

Effective Way to Measure Airflow

Obviously, you cannot walk next to a piece of equipment or meter and check the velocity through the ductwork.  However, if you have a cyclone dust collector you can.  Cyclone pressure drops are based on the airflow through them.  The more air you send through a cyclone, the higher the pressure drop.  Each cyclone design has its own equation to determine pressure drop based on the airflow.  With this equation, you can estimate the airflow based on the pressure drop in your cyclone.


The GPC Dust Collector is an efficient way to handle your dust collecting needs. Simply click below for direct access to the GPC spec.

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Exhaust Fans: The Motive Force of a Dust Collection System

In this video, Aerodyne discusses how system changes and fan performance affect your dust collection system.

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To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.

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Topics: dust collector, Dust Efficiency Clinic, air flow, compact cyclones, Dust Collector filters, Cyclones pre-filter, Dust Re-Entrainment

Dust Re-Entrainment | Aerodyne

Posted by Tom Hobson on Oct 31, 2019 9:30:00 AM

The key in a dust collector is to remove as much dust as possible from the airstream.  However, another very important part of this is to keep that dust out of the airstream so it doesn’t re-entrain. 

Baghouses and Cartridge Collectors

Baghouses and cartridge collectors collect the dust on the filters and during cleaning, the material is knocked loose and falls to the hopper.  How well the material falls to the hopper is dependent on the dust that is being collected, the can velocity (speed of air between the filters) in the baghouse, and the design of the baghouse.  

Basically, if the dust is very light and/or irregular in shape, then it might not easily fall to the hopper, instead it might float (like a leaf).  This could cause it to be re-entrained in the airflow and go back on the filter.  If the airflow is very high then the can velocity could hold up dust after cleaning, thereby causing re-entrainment of the dust.  The design of the unit can affect re-entrainment as well.  Some units have the dust coming in the unit below and at a rather high speed, which can increase dust re-entrainment.  Others will have the dust entering from the side of the filters, thereby being at a much lower velocity and out of the path of falling dust.

Cyclones

Cyclones use centrifugal force to push the particulate dust outward.  Most cyclones also use tapered walls to concentrate the dust as it gets lower in the cyclone until it falls into the hopper, while the clean air leaves the cyclone through the center.  The point where the air stops traveling down the walls and begins to travel up the center is called vortex reversal.  Depending on dust size, concentrations, and cyclone design, dust can be re-entrained by the clean air leaving the cyclone.

Wet Scrubbers

Wet Scrubbers are very good at low re-entrainment.  This is because when the dust meets a droplet, they become one larger particulate and then fall out of the airstream easier.  Most well designed wet scrubbers have a mist elimination section that will further collect droplets before leaving the collector.

 


5 Signs Your Dust Collection System Needs a Pre-Filter

Watch the video from the Dust Efficiency Clinic discusses how using a pre-filter will optimize your dust collection system. 

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To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.


To improve efficiency and safety, there is no substitute for an on-site inspection by an experienced expert. Click below to start with a free 20-minute phone consultation by clicking the button.

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Topics: dust collector, Dust Efficiency Clinic, compact cyclones, Dust Collector filters, Cyclones pre-filter, Dust Re-Entrainment

Why You Need Space Saving Pre-filter Cyclones | Aerodyne

Posted by Tom Hobson on Jul 19, 2019 10:33:59 AM

As regulations to minimize dust emissions became more stringent, the reliance on filter media became more prevalent.  This means baghouses and cartridge collectors have become the most common dust collectors around. 

Dust Collector Filter

The filters allow air to pass, while dust is captured on the filter surface area.  A filter cake of dust forms, allowing the highest removal efficiency of the filters.  Periodically, the filters will be cleaned to drop dust off the filters/ filter cake, allowing more air through the filters.  The higher the concentration of dust, the faster the filters will require cleaning to keep the pressure drop down.  Every time the filters are cleaned the fabric of the filter wears a bit.  So, if you can minimize the cleaning, then the filters will last longer.

Cyclone Pre-Filter and Dust Collector Filter

Cyclone pre-filters capture a high percentage of the dust before it even gets to the filters; therefore, allowing less clean cycles on the filter media.  Cyclones use centrifugal force to capture dust and droplets and remove them from the airstream.  Unlike filters, the higher the concentration of dust in the airstream, the better the cyclone performs.  Cyclones provide very good removal of larger dust particles, often getting removal efficiencies as high a 99% for 30-40 micron dust particles.  But they do remove lower amounts of smaller particles.  So the cyclone is a perfect companion for dust collection filters as they will remove most of the larger particulate.  This can often be 80-90% of the total dust loading of a system by weight.  The cyclone pre-filter then allows the filters to deal with only the fine dust that gets past the cyclone.  The lower loading of dust on the filters allows the filters to last longer and conserve energy as the cleaning cycle isn’t used as much.

Compact Cyclones

Compact cyclones, such as the Aerodyne GPC, allow cyclone pre-filters to be used in existing facilities where larger (taller) cyclones won’t fit.  The Aerodyne horizontal GPC cyclone provides one of the most compact designs - often ⅓ the height of traditional cyclones.  This can often allow the cyclone to be installed inside or in smaller areas of an existing system.  Traditional cyclones typically require outdoor installation, unless the facility has high ceiling.

So if your filter dust collection system is experiencing operational issues, look into compact cyclone pre-filters as a possible solution before you decide to scrap your current unit and install a new one.

 


5 Signs Your Dust Collection System Needs a Pre-Filter

Watch the video from the Dust Efficiency Clinic discusses how using a pre-filter will optimize your dust collection system. 

Watch Video

 


To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.


To improve efficiency and safety, there is no substitute for an on-site inspection by an experienced expert. Click below to start with a free 20-minute phone consultation by clicking the button.

Free Consultation

 

 

Read More

Topics: dust collector, Dust Efficiency Clinic, compact cyclones, Dust Collector filters, Cyclones pre-filter

Aerodyne Environmental: Home of the Horizontal Cyclone and  Vacu-Valve® Airlock Valve

Inspired To Be Different.

At Aerodyne, we choose to take a different approach to collecting dust and handling materials. Our cyclones are unique in design to address common issues such as problematic dusts and space constraints. Our airlocks are chosen to fit your specific application instead of hastily installing traditional equipment options. We believe that when we see things differently, we can solve problems effectively. That's why so many people turn to us for help in solving their tough dust problems.

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