Stelter & Brinck Blog

Fluid Bed Dryers & Process Air Heaters

The fourth and final type of dryer that we will discuss that utilizes air heaters is a fluid bed dryer (or fluidized bed dryer). According to Wikipedia: “A fluidized bed is formed when a quantity of a solid particulate substance is placed under appropriate conditions to cause the solid/fluid mixture to behave as a fluid.”

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Spray Dryers and Their Heat Source

We have discussed flash and rotary dryers; the third type of industrial dryer that uses a process air heater for hot gas generation is a spray dryer. Spray dryers are known for distributing a consistent particle size and are the most prominent drying system in the food and dairy powder industries. Powdered colors, inorganic chemicals, insoluble organic dyes, and instant mixes are just a few of the items that require spray drying.

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What Type of Air Heater Do Flash Dryers Utilize?

As we mentioned last week, there are 4 main dryer systems that use process airs: rotary dryers, pneumatic/flash dryers, spray dryers, and fluidized bed dryers.

This week we will focus on pneumatic/flash dryers (we will refer to them as flash dryers). Flash dryers make up some of the largest dryers in the world! These dryers are used in processes where the feed is susceptible to quick drying; filter cakes, polymers, granules, pastes, ect. Below is a diagram of a flash drying system: (more…)

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Industrial Dryers that Use Air Heaters – Highlighting Rotary Dryers

While there are many types of dryers used in industry today, there are 4 main systems that implement indirect fired air heaters or direct fired process air heaters.  These dryers include: rotary dryers, pneumatic/flash dryers, spray dryers, and fluidized bed dryers.

Rotary Dryers

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