A Look At The Design and Performance of the Spray Dryer For Milk Powder

The Design and Performance of the Spray Dryer For Milk Powder
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This article aims to look at the design and performance of the spray dryer for milk powder production.

Spray drying is a popular technique in food industries used by a spray dryer device to convert milk in its liquid form to powder.

This process is done simply by removing the moisture component from the liquid milk solution.


Drying of the materials in the spray dryer involves 3 processes, namely;

•   Liquid atomization

•   Drying of the liquid droplets

•   Full recovery of the dried products

Spray drying involves milk concentrate atomization from the evaporator into fine droplets.

This process is done inside a big drying chamber device in a hot air flow (up to 200 °C), using either many high-pressure nozzles or a spinning disk atomizer.

The milk droplets are later cooled by evaporation and never attain the temperature of the air.

This concentrate may be allowed to undergo heat before atomization in other to increase the energy available for drying and to reduce its viscosity.

Much of the water left is evaporated in the drying chamber, leaving a fine powder with around 5-6% moisture content having a mean particle size of <0.1 mm diameter.

The final drying stage occurs in a fluid bed; the hot air is blown through a layer of fluidized powder to remove water to the point of moisture content ranging between 2 to 4%.


The spray dryer construction consists of a large cylindrical drying chamber having a short conical bottom which is made up of stainless steel with a diameter of the drying chamber ranging between 2.6 to 9 m and a height of about 25 m or more.

An inlet for the hot air is placed on the chamber roof. In addition, another inlet spray disk atomizer is attached to the top.

The spray disk atomizer is about 310 mm in diameter and rotates at a speed of about 3000 to 50000 revolutions per min.

A cyclone separator is connected to the bottom of the dryer.


There are many advantages to using a spray dryer in the production of powdered milk.

The drying is rapid, and it’s a continuous process. Also, the drying process is completed within 3 to 30 seconds.

 Moreover, uniform and controlled-size products can be obtained simply by using a suitable atomizer.


One of the major disadvantages of using a spray dryer for milk production is that it is very expensive.

A spray dryer is costly and bulky. Another disadvantage is that it is difficult to operate.

In conclusion, spray dryer for milk powder production has found their way into the milk production industry.

Spray drying is one of the most extensively used industrial mechanisms in particle formation and drying processes.

odedoyin O. Samuel

Since 2009, Odedoyin has been a professional health writer, educator and blogger, dedicated to helping people effectively improve their health and staying healthy.. If you need a good and SEO content or post for your health blog or website, do not hesitate to contact me. Contact Me Now Email Address : odedoyin@healthpent.com Whatsapp +2348106352328

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