Drying characteristics of fine powders in an inert medium circulating fluidized bed with binary inert media

作者：Kang Dong Hyun; Kim Sung Ii; Chun Won Pyo; Lee Dong Hyun^*

来源：Journal of Industrial and Engineering Chemistry, 2017, 45: 266-276.

DOI：10.1016/j.jiec.2016.09.034

• Drying
• Fine particle
• Inert circulating fluidized bed
• Binary solids

The effects of two types of inert particles (binary: 180 and 500 pm or mono: 500 pm), inlet gas temperature (40-100 degrees C), and mass ratio of fine to inert particles (F/I) (0.05-0.2) on the batch type fluidized bed drying characteristics of fine powders were investigated in an inert media circulating fluidized bed (0.087 m-ID x 1.0 m-height). Copper dendrimer powder (X-0 = 25.0% wet basis, d(p),= 2.7 mu rn, = 5980 kg/m(3)) and aluminum flux (Al flux) (X-0=30.2% wet basis, d(p) = 8.6 mu m, rho(p)= 2730 kg/m(3)) were used as the fine humid materials, and glass beads (180 and 500 mu m) were used as the inert media particles. The moisture contents of the dried powders were sufficiently low, from 0.2% to 0.7% (wet basis). The result shows that the aggregation phenomenon rarely occurs. Compared with using the mono type inert media fluidized bed dryer, the amount of dried product using an inert media circulating fluidized bed with binary inert media increased by two to three times. The maximum drying rate of the inert media circulating fluidized beds with binary inert media is higher than that of the agitated pan dryer and inert media bubbling fluidized bed dryer (mono type inert). Additionally, the optimum condition (T-g = 60 degrees C, F/I ratio = 0.1, binary inert media) was derived from the energy efficiency.

• 出版日期2017-1-25