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Download e-book for iPad: Advanced Drying Technologies by Tadeusz Kudra

By Tadeusz Kudra

"Presents the newest breakthroughs in thermal dehydration, drying, and dewatering. Emphasizes rising gear, leading edge ideas, and affordable thoughts for various commercial and agricultural functions. bargains category and choice standards for brand new and complicated drying systems."

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Sample text

5 Particle trajectory for double penetration in a semicircular impinging streams (F c ϭ centrifugal force; F cp ϭ centripetal force; F D ϭ drag force; F ϭ lift force). Planar with circumferential flow, in which streamlines form concentric circles in the impingement plane Tubular, in which impinging streams meet at the cylindrical surface Annular, in which impinging streams meet in a sector of annulus Single impinging stream units can be combined in series and/or in parallel to form a system allowing extension of the residence time and development of different hydrodynamic or temperature regimes.

Inlet. During passage through the venturi tubes and air ducts, the inert particles are additionally heated by a hot-air stream so that the temperature of recycled inert particles is much higher than the bed temperature. Hence, evaporation of moisture from the wet coat is not only due to sensible heat of gas phase but also due to the sensible heat stored in the inert particles. 3. 8 Swirl-jet-spouted bed dryer. b. 9 Schematic of the Ecal dryer and temperature distribution along the bed height. ) 48 Chapter 4 veyor screw.

1. The average temperature of the bed (T p ) can be determined experimentally or assumed to be lower than the exhaust gas temperature by 15° to 20°C. Also, the water vapor pressure in the bulk of drying gas can be calculated based on the exhaust gas humidity. The ϕ parameter should be determined experimentally, as it depends on dryer configuration, particle and material characteristics, and operating parameters. 3 mm. The calculated drying time varied from 60 to 90 seconds, whereas the experimentally determined material residence time was in the order of 200 to 400 seconds.

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