Soybean drying characteristics in microwave rotary dryer with forced convection

doi:10.1007/s11705-009-0022-y

Front Chem Eng Chin

2009, Vol. 3

Issue (3) : 289-292 https://doi.org/10.1007/s11705-009-0022-y

RESEARCH ARTICLE

Soybean drying characteristics in microwave rotary dryer with forced convection

Ruifang WANG, Zhanyong LI(

), Yanhua LI, Jingsheng YE

College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, China

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Abstract

A new hybrid drying technique by combining microwave and forced convection drying within a rotary drum, i.e., microwave rotary drying, was developed with the purpose to improve the uniformity of microwave drying. In a laboratory microwave rotary dryer, rewetted soybean was utilized as experimental material to study the effects of drum rotating speed, ventilation flow rate, and specific microwave power on the drying kinetics and cracking ratio of soybean. It was found that, with rotation, the cracking ratio can be lowered but without distinct improvement in the drying rate. Increasing ventilation flow rate and specific microwave power can improve the drying rate, but the cracking ratio also increases as a negative result. The cracking ratio lower than 10% can be attained for ventilation flow rate lower than 2.0 m³·h^-1 or specific microwave energy lower than 0.4 kW·kg^-1 in the present experiments.

Keywords cracking microwave rotary drying soybean

Corresponding Author(s): LI Zhanyong,Email:zyli@tust.edu.cn

Issue Date: 05 September 2009

Cite this article:

Ruifang WANG,Zhanyong LI,Yanhua LI, et al. Soybean drying characteristics in microwave rotary dryer with forced convection[J]. Front Chem Eng Chin, 2009, 3(3): 289-292.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0022-y
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I3/289

Fig.1 Schematic of a laboratory microwave rotary dryer

Fig.2 (a) Effect of drum rotating speed on the variation of moisture content time, Effect of drum rotating speed on drying rate
( = 126 W, = 400 g, = 1.31 m·h)

Fig.3 Effect of drum rotating speed on kernel cracking ratio ( = 126 W, = 400 g, = 1.31 m·h)

Fig.4 Effect of ventilation flow rate on the variation of moisture content time
( = 126 W, = 400 g, = 20 r·min)

Fig.5 Effect of ventilation flow rate on kernel cracking ratio
( = 126 W, =400 g, = 20 r·min)

Fig.6 Effect of specific microwave energy on the variation of moisture content time
( = 126 W, = 15 r·min, = 1.31 m·h)

Fig.7 Effect of specific microwave energy on kernel cracking ratio
( = 126 W, = 15 r·min, = 1.31 m·h)

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