An Investigation of Radiant Heat Distribution on Drying Area in the Chamber of Infrared Rotary Dryer

Abstract:

An investigation of radiant heat distribution on drying area in the chamber of infrared-rotary dryer (IRD) was conducted by measuring the values of infrared radiation on drum surface of the dryer chamber and then showed in term of surface temperature (ST). A gas-fired infrared burner (GIB) was used as the heat source, radiated the electromagnetic wave in the length of near-infrared ray. The drum surface was set as an infrared radiant absorbing area, installed with type K thermocouples and set as grid. Different levels of drum diameters (D=700, 900 and 1100 mm.), infrared peak wavelengths (IRP=3.32, 2.97 and 2.70 micron), distances between GIB and drum surface (H=300, 400 and 500 mm.), grid positions on drum surface (longitudinal direction (L) and radial direction (W) = 900 x 900 mm²) were applied. Then, distribution of surface temperature values was analyzed, based on response surface methodology (RSM) obtained from a second order polynomial model. The results showed that IR and H were the main factors affecting the radiant heat distribution. Then, the surface plots of ST levels on the absorbing drum surfaces in the rotary drying chamber were constructed. The contour plot results were indicative of a use for the design and selection of an appropriate size of area for drying with uniform distribution of IR in accordance with user-defined parameters.

• Periodical: Advanced Materials Research (Volumes 1044-1045)
• Pages: 232-235
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1044-1045.232
• Online since: October 2014
• Authors: J. Laohavanich*, S. Yangyuen, N. Thowjantuek
• Keywords: Infrared Ray, Radiant Heat Distribution, Rotary Dryer, RSM

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