Monoammonium phosphate (MAP) fertilizer drying kinetics in tray dryer

Abstract

The drying behaviour of monoammonium phosphate fertilizer was examined in a static tray dryer, establishing kinetic parameters that may be used to improve the design of dryers. Drying temperatures ranged from 80 to 95 °C, and surface air velocity was 0.50 m/s. The material was previously separated into two particle sizes, between 1.40 and 2.38 mm mean diameter. Drying curves were analysed qualitatively and seven empirical kinetic thin-layer models were fitted. The drying kinetic showed to be temperature-dependent: a moisture ratio reduction of 90% was achieved twice as fast at 95 °C than at 80 °C. On the other hand, particle size did not exert significant influence on the drying rate. The results showed a decreasing drying rate throughout the whole process. All studied models adjusted well to the experimental data: R 2 values were all above 0.999. The two-term model generated the lowest RMSE and χ 2 values, between 0.00621 and 0.010743 and between 0.000044 and 0.000115, respectively.

Study of tray and pulsed fluidized bed drying of brewer’s spent grain

“…Kucuk et al [17] and Erbay and Icier [18] presented a comprehensive review on the use of these equations. Similar studies to the one presented in this paper were conducted by Hacihafizoglu et al [19], who modelled the thin-layer drying of rice, Alibas [20], who compared 21 different models for drying red chilli pepper, Nascimento et al [21], who modelled the drying curves of seeds in spouted bed, Doymaz et al [22], who studied the effect of infrared power on drying kinetics of green beans, Covello and Nitz [23] who studied fertilizer drying kinetics in a tray dryer, and several others [24][25][26][27][28].…”