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INDIRECT ROTARY DRYERS When direct drying is not an option, FEECO offers state-of-the-art indirect dryers to suit your drying needs. Indirect dryers are similar in design to direct dryers, but instead of using direct contact between the material and drying air to reduce moisture, the heating medium is kept separate from the material to avoid

for the indirect-contact dryer and smaller air-handling equipment for the dryer’s exhaust system. Examples of indirect-contact dryers include the scraper drum dryer, paddle dryer, disc dryer, hollow-screw dryer, and steam-tube rotary dryer. An illustration of an indirect-contact, steam-tube rotary dryer is shown in Figure 2. Combination drying

Indirect Rotary Drum Dryers. Unlike direct dryers, indirect dryers do not rely on direct contact between the material and process gas to dry the material. Instead, the rotating drum is enclosed in a furnace, which is externally heated. Contact with the heated drum shell is what dries the material

Jun 01, 2016 Jun 01, 2016 Rotary Dryer – Kiln. For evaporating moisture from concentrates or other products from plant operations, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used

Rotary steam tube dryers dry at a lower temperature, are resilient and can handle significant upsets. Dryers that use steam as a heat source instead of hot air tend to operate with greater thermal efficiency. In addition, the installed cost of steam tube dryers is roughly the same as direct fired dryers. Rotary steam tube dryers are easier and

Jul 05, 2020 Jul 05, 2020 Indirect rotary dryer. 4. Special type. A rotary dryer is said to be of the direct type if, by virtue of its design, heat is added to or removed from the solids by direct exchange between the gas and solids. The direct heat dryers are the simplest and the most economical class. They are used when direct contact with the hot gas or air is not

Aug 03, 2021 Aug 03, 2021 Solex Thermal Science’s vertical moving bed coolers, heaters and dryers rely on two fundamental principles for operation: The first aspect, indirect heat exchange, helps to drive significant efficiency advantages over direct heating, cooling and drying equipment (e.g. fluidized beds, rotary drums). Taking heating equipment as an example

Direct- vs. Indirect-Fired Rotary Kilns: Choosing the Best Solution for Your Particular Case. If you can perform a process in a direct-fired rotary dryer or kiln, chances are quite high that you can carry out the same process in an indirect-fired device. However, there are pros and cons in using one or another type of rotary dryers and kilns

Dryers in the United States Location Type of Dryer Type of Biosolids Dried Milwaukee, WI Direct, rotary Blend of raw secondary with digested primary Baltimore, MD (Patapsco) Direct, rotary Blend of raw primary with secondary North Andover, MA Direct, rotary Anaerobically digested Newport, TN Indirect, rotary chamber Anaerobically digested

In the most sensitive drying applications, industrial rotary dryers can use heated inert gasses instead of heated air to dry objects. Air is a main ingredient in many combustion reactions, and combining heat, air and combustible materials in a spinning enclosure is generally not advisable

Indirect rotary dryers also require an internal air low, referred to as sweep air. ... In unique cases such as these, a direct-ired rotary dryer would not be an option, so an indirect-ired dryer would be used instead. The need for sterility can also dictate the material of construction used for the shell of the dryer. Other examples of material