Evaluation of performance and energy consumption of an impinging stream dryer for paddy

摘要: Abstract Impinging stream dryer has proven to be an excellent alternative means for removing surface moisture of particulate materials. In this study, a coaxial two-impinging prototype paddy, whose needs removed prior subsequent processing, was developed and tested. The effects various operating geometric parameters, i.e., inlet air temperature, impinging distance, particle flow rate feeding characteristics (single-point vs. double-point feeding), on the overall performance (in terms volumetric water evaporation heat transfer coefficient) energy consumption were then studied. It found that could reduce content paddy by 3.4–7.7% (d.b.) within very short period time. maximum value about 198 kgwater/m3 h, while coefficient 7013 W/m3 K. mean residence time particles (paddy) in system range 1.81–2.42 s, leading average drying 1.52–3.83 (% d.b.) s−1, which is 250 40 times higher than spouted-bed fluidized-bed dryers, respectively. lowest total specific process 5.1 MJ/kgwater when using at temperature 110 °C, distance 5 cm 150 kgdry solid/h.