Adding Atomized Water To A Starch Blending Application

Starch blending takes place at the top of this tower

The image above shows a material transfer process for starch.  At the top of the tower the starch rests inside of tumbling tanks (shown below) which blend larger pieces into small, finely blended particles.  In order to achieve the proper blend, an hydration level of 5% water must be maintained within the tank.  For the water introduced to the tank, the smaller the droplet size of the water particles, the better the blend.  The current setup in this application is to spray water directly into the tanks, by hand, using a pump sprayer.

These are the tanks at the top of the tower shown in the photo above

The investigation into droplet sizes led this customer to EXAIR Atomizing Nozzles, searching for a method to introduce small droplet water particles into the blending tanks.  The ultimate question was “How small of a particle size can we achieve with an EXAIR Atomizing Nozzle?”

The answer to that question can be found here on our website and in our catalog as well.  Our smallest confirmed droplet size is currently 22µm when using our 1/4″ NPT Siphon Fed Atomizing Nozzles, which was more than enough for this application.

Model SR1010SS EXAIR Atomizing Nozzle

By installing SR1010SS atomizing nozzles into this application this customer is able to achieve the required hydration level with small droplet size water particles.  These particles ensure proper blending of the starch and proper quality for the final product.  And, the atomizing nozzles prevent an operator from having to manually add the necessary water to achieve the required hydration in the blending tanks.

If you have a solution in need of an atomized liquid solution, contact an EXAIR Application Engineer.  We’re here to help.

 

Lee Evans
Application Engineer

LeeEvans@EXAIR.com
@EXAIR_LE

Atomizing Nozzles Create Fog for Wet Room Testing

Recently, I was working with a customer that has purchased several of the EXAIR Atomizing Spray Nozzles, specifically the model Aw5020SS.  The customer had another project coming up and needed two more nozzles. I inquired about the application and we discussed at length the way the nozzles are being used.

When a concrete road is being poured, several sample forms are poured during the process. The local Department of Transportation takes the samples and cures them in a wet room for 30 days, and then performs tensile testing, to confirm the concrete meets the strength requirements.  The wet room must be kept at 23°C (73.4°F) and 100% Humidity during this time frame.  The EXAIR model AW5020SS Atomizing Nozzles are used to provide the moisture that ensures the room humidity conditions are met and maintained.  Because the droplets are very fine, the effect of a fog is achieved, with the water droplets suspended in the air, keeping the humidity at 100%.

Atomizing spray nozzles are capable of producing very fine droplet sizes.  A typical rain drop is 6000 microns in diameter, standard liquid nozzles produce droplets ranging from 300-4000 microns.  The EXAIR Atomizing Nozzles produce droplets from 20-100 microns!

AW5010pr800.jpg

Model AW5020SS

Droplet  sizes can be adjusted by varying either the liquid pressure or air pressure. Increasing the air or decreasing the liquid pressure will generally produce a smaller droplet size.

EXAIR manufactures (3) types of Atomizing Nozzles – Internal Mix, External Mix, and Siphon Fed, in both 1/4 NPT and 1/2 NPT sizes. Maximum liquid viscosity is 800 cP. Flow rates range from 0.6 GPH up to 303 GPH, so we’ll be able to find one that meets your flow requirements.

To discuss your application and how an EXAIR Atomizing Nozzle can benefit your process, feel free to contact EXAIR and myself or one of our other Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

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