Interesting Compressed Air Application:  Cooling a Smokestack with Air Amplifiers

In some cities when you look along the skyline, you see flue stacks bellowing out plumes of white smoke.  I never paid much attention to the structure except that they were tall and in some cases very wide.  A power company contacted EXAIR about their flue stacks.  They did a temperature reading, and they found a hotspot within the wall of the stack.  To cool the hotspot, they contacted EXAIR for a solution. 

Smokestacks are large chimneys that can be from 825 feet (250m) to 1,188 feet (360m) tall and are designed to release the smoke high in the air.  As a tall structure, it is important to keep the walls stable and sound.  For this customer, they were getting a hotspot reaching a temperature of 750oF (400oC).  This was too hot, and it could cause premature issues to the construction of the stack.  They wanted to reduce the temperature to 400oF (204oC) to keep the stack from warping and degrading.  We were able to find a solution using our stainless steel Adjustable Air Amplifiers

Adjustable Air Amplifier

The area of the hotspot in their smokestack was a section around 2 feet (0.6m).  The customer fabricated a stainless-steel manifold to mount three pieces of model 6033 3” 303SS Adjustable Air Amplifiers.  The model 6033 will only use 35.2 SCFM (997 SLPM) of compressed air at 80 PSIG (5.5 bar).  With the high amplification ratio, the model 6033 can move 2,323 SCFM (65,780 SLPM) of air along the surface.  The large volume of air created good cooling capacities to reduce the hotspot temperature.  In keeping the temperature of the stack under control, they could continue operations and lessen the concern for untimely shut-downs and costly maintenance. 

By using air to cool, you can do it safely and cleanly.  Unlike fans which create turbulent flows, voids, and high noise levels, the EXAIR Air Amplifiers generates a large volume of laminar air to cool and clean.  If you would like to speak about any cooling application, you can contact an Application Engineer; even something as large as a smokestack. 

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

Photo:  Smokestack by cwiznerPixabay Licence

Air Amplifiers – Vent, Exhaust, Cool, Dry, Clean – With No Moving Parts!

As an Application Engineer, one of the interesting aspects of working with customers on applications is the varied types of solutions an EXAIR product can provide.  The Air Amplifier family – Super Air Amplifier, Adjustable Air Amplifier, and the special High Temperature Air Amplifier can be used in a wide variety of process and applications.  Below highlights several of those from past experiences.

A defense contractor was performing maintenance service on a Navy ship, and the ventilation system had to be shut down.  To keep the personnel cool and safe, an auxiliary ventilation was to be supplied.  Rather than use a cumbersome blower assembly, which has to mounted on the top deck, and ducted down to the lower decks, they chose to utilize (2) 4″ Super Air Amplifiers.  They are very portable and can be set up in minutes.  This solution provided the necessary air flow, providing a safe environment for the maintenance crew.

Super Air Amplifier
EXAIR Air Amplifiers use a small amount of compressed air to create a tremendous amount of air flow.

A light bulb manufacturer needed a better solution for a cooling operation.  During manufacturing of a mercury lamp, the bulb must be cooled from 700°C to 600°C in just 15 seconds.  The current method, an open brass pipe, was working but the noise level was too high (95 dBA.) The goal was to maintain the 15 second cooling time, but reduce sound levels to 85 dBA.  By utilizing (2) of 3/4″ Adjustable Air Amplifiers, the customer was able to maintain the cooling rate, and reduce the noise level down to 80 dBA, a 15 dBA reduction.

adjustable Air Amplifier
Adjustable Air Amplifier

A garbage collector presented a problem that needed a solution.  The garbage was incinerated and when the furnaces were first started up, there tended to be issues with getting the flue to draft properly.  Using the High Temperature Air Amplifier, the high velocity air flow and draw provided the needed draft until the stack warmed up and the natural draft would be established.  Since the unit is capable of handling temperatures up to 700°F, it was able to withstand the heat of the process after the compressed air was turned off.

These and other Applications for the Air Amplifiers and all other EXAIR products can be found on the EXAIR website on the Products page, under the Related Info section toward the bottom of each page.

If you have questions regarding Air Amplifiers or any EXAIR Intelligent Compressed Air® Product, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

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