direct fire rotary drum dryer

Direct and indirect-fired rotary dryers are used in a variety of industrial settings to dry bulk solids. While the two are both comprised of a rotating drum and function to reduce a material’s moisture, several differences between direct and indirect dryers exist:

If your rotary drum dryer is struggling to achieve uniform moisture content, and is still being operated inside design criteria, it may be time to consider a new flighting design. However, if your dryer used to process the same material at your current rates just fine, you may have flight damage – either from fire

The Vulcan Drying Systems direct fired rotary dryer is the workhorse of the drying industry. A simple unit, the inclined rotating cylinder, is fitted with a combustion chamber where an industrial burner radiates heat through the chamber and down the center of the drum

Mar 11, 2020 Fire incidents in indirect dryers are much less frequent than the fire incidents in direct fire dryers. The potential for traveling combusted materials along the drum is lower in indirect dryers. Currently, the direct heated rotary drum dryer is the most popular type of dryer in the pellet industry

Feb 13, 2015 Feb 13, 2015 Most of the conditions described below that could lead to fires and explosions affect direct-fired, rotary drum dryers, but many apply to almost any type of dryer system. (Make sure to see the April 2015 issue of Process Heating, where Part 2 of this series will discuss the specific measures to take to prevent fires and explosions.)

The dryer is typically sloped, so that the product enters and gradually falls toward the discharge end. In direct rotary dryers, the air is passed through burners, and directly comingles with the product. Rotary dryers have been used to dry seeds, corn gluten, distiller’s grains, and some fruit

the film drum dryer, units in which heat is transferred by conduction are suitable ... Evaporation rates for rotary, Spin Flash, and spray dryers are expressed in lb/ft3hr. ... ROTARY 2.0 – 6.0* 30 – 100 (direct) Eav = 4.0 Eav= 65 - fair fair good continuous SPIN FLASH 4.0 – 18* 70 – 300

Used 104.5 diameter Direct fired rotary DAF dryer system. Mfg Uzelac Industries. Model TDP-4000. 176000 TPD at 60% dried to 10%. Solids dryer drum with refractory lining and fins. Dimensions 24'OAL x 8'9 Dia. 114HP motor. Natural gas fired burner 575-675F. System includes combustion blower with drive, product collector, cyclone, dryer fan airlocks, silo storage, duct work

Rotary Dryers - Direct Fired Single Pass Direct Fired Single Pass •800-1,200 F feed temperature (as low as 450 F) controlled with flue gas recirc. (FGR) •200-250 F exhaust temperature (full range of 160-300 F), above 220 F prevents condensation of acids and resins •FGR improves heat transfer and reduces fire

The work horse of the Vulcan Drying Systems Manure Dryer System is the heavy duty, low temp, direct heating, rotary drum dryer. More Info The low temp dryer is extremely energy efficient and can be configured to utilize a variety of fuels or waste heat to perform the drying process. Our single pass system is a simple low cost method of producing a granular fertilizer

Indirect rotary dryers differ from convective-direct dryers in that heat is transferred to the wet product by conduction and radiation through the cylinder wall or through a series of tubes located circumferentially to the cylinder. Indirect rotary dryers use as heating medium hot gases coming from a combustion chamber