Stelter & Brinck Blog

Direct Fired Vs Indirect Fired?

What is the technical difference between direct fired and indirect fired? In terms of process air heaters, what are the features, benefits and applications of direct fired vs indirect fired?

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Low-NOx Process Heat Equipment

NOx is a greenhouse gas formed during the combustion of fossil fuel and tends to increase with higher temperatures. NOx emissions interact with atmospheric gases to produce low air quality, acid rain, vision and respiratory problems for humans, and destroy plant life.

Because of their ill effects, the Environmental Protection Agency (EPA) regulates NOx and other emissions produced by manufacturing facilities.  In order to comply with the EPA’s standards, and be socially responsible, most companies implement emissions programs; these companies continually focus efforts on ways to reduce their emissions levels, while improving their bottom line.

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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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