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Duct Air Heaters Direct Fired process heaters are widely used in industry. One type of direct fired air heaters is Duct Air Heaters, which earned their name not only due to their shell, but also because they are designed to be inserted right into process ductwork. Operation may be summed up as follows: combustive gases are ignited and mixed with a specific amount of air/oxygen. This hot air that is generated is then blown through the duct heater into the process. These process air heaters are manufactured to fire on common fuels like natural gas, propane and butane. However, they may be custom manipulated during manufacturing, to suit other fuel requests. Two of the most typical designs of this direct fired process heater are: Fresh Air Duct Section Air Heater Recirculating Duct Section Air Heater

Fresh Air Duct Section Air Heaters are used in situations in which air stream contains more than 18% oxygen. These process air heaters use “fresh air”, so they do not require an additional combustion air source in the process. Recirculating Duct Section Air Heaters are used when the oxygen content in a particular air stream is less than 18% oxygen or in situations in which the air stream is hot/dirty. This direct fired air heater uses a blower to “recirculate” the air that is already present, so they also do not require an additional air source. Duct air heaters are used in a wide range of industries like ceramics, clay and brick kilns, active carbon regenerative manufacture, pulverized coal-drying, etc. It is expected that all direct fired air heaters comply with major safety/insurance standards, such as National Fire Protection Association, CE, Canadian, & GAP (IRI). For more information visit http://www.stelterbrinck.com/duct-air-heaters.htm

Duct Air Heaters  

Direct Fired process heaters are widely used in industry. One type of direct fired air heaters is Duct Air Heaters, which earned their name...

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