Stelter & Brinck Blog

Process Heat Equipment

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

Industries have been using process heat equipment for centuries in manufacturing. While the products generated by process heat equipment benefit society greatly, the equipment also generates EPA controlled emissions.

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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

the hot air utilized in the spray drying process is generated by an air heater. Air heaters are classified as either indirectly fired (indirect air heater) or direct fired (direct fired air heater). The type of air heater used depends upon the thermal sensitivity of the feed and thus, an indirect fired air heater is typically used for food, pharmaceuticals, dairy and other chemically sensitive products.

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