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Experimental Study on Spin-flow Pressure Nozzle for Spray Drying

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036222,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14164) @2003
Authors:   Zhongjie Zhang, Zhihuai Mao, Dong Li
Keywords:   Drying, nozzle, SMD, volumetric evaporation intensity, CFD, amino acid, spray dryer

Pressure spray dryers have been widely used in agricultural and industrial production. Liquid materials such as food, herbal medicine, dyestuff, detergent, etc. are dried mostly by single nozzle pressure spray drying device. Due to the small spraying angle, the conventional pressure spray dryer will increase the Sauter Mean Diameter (SMD) and give a wider range of diameter distribution from 10 m to 500 m, resulting in increased drying time needed, decreased energy efficiency, and lower volumetric evaporation intensity. In order to minimize energy consumption, enhance vaporizing intensity and improve product quality, a combined spin-flow pressure spray nozzle was developed based on theoretical analysis and experimental studies. The spraying angle of this nozzle can be adjusted from 30~180, and the droplet distribution is limited within 30 m ~150 m. With the help of CFD software, a rational system configuration of spray dryer was determined. Experimental results indicated a substantial improvement in productivity and the final quality of the products. The preliminary results obtained from drying of thermal sensitive amino acid with a pilot scale dryer showed that the energy efficiency is greater than 50% and the volumetric evaporation intensity is up to 12 kgH2O/m3h.

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