Journal
DRYING TECHNOLOGY
Volume 35, Issue 2, Pages 173-181Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2016.1164712
Keywords
Drying behaviors; kinetics model; low-rank coal; negative pressure
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Funding
- National Natural Science Foundation of China
- Shenhua Group Corporation, Ltd [U1261101]
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The drying behaviors of low-rank coal (LRC) under negative pressure were studied with a vacuum-drying oven under different pressures and temperatures. The results confirmed the feasibility of using the Page model to predict the drying behaviors of LRC under negative pressure. A new ideal radical ball model was proposed to further qualitatively analyze the influences of pressure and temperature on the drying behaviors. Reasoning based on the radical ball model combining the Kelvin formula, Fick's first law of diffusion, Knudsen's diffusion law, and transition diffusion region suggests that a higher negative pressure and temperature leads to a higher maximum dehydration rate, that larger pressure and temperature gradients cause smaller critical moisture contents, and that decreases in the drying pressure and increases in the temperature increase the instantaneous removal rate of bound water.
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