Journal
DRYING TECHNOLOGY
Volume 33, Issue 3, Pages 277-287Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07373937.2014.952382
Keywords
Additional field assistance; Drying; Fluidized bed; Low-rank coals
Categories
Funding
- National Basic Research Program of China [2012CB214902]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20130095110004]
- Fundamental Research Funds for the Central Universities [2014XT05]
- Science and Technology Key Projects of Shandong Province [2013G0021701]
- Research and Innovation Project for Graduate Student of Jiangsu Province [CXZZ13-0940]
- Science and Technology Key Projects of Jining City [2013JNKJ003]
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The high moisture content of low-rank coals is a matter of concern in many areas, creating high transportation costs, potential safety hazards in transportation and storage, and the low thermal efficiency obtained in conversion processes. It is important to reduce this moisture content to acceptable limits in order to decrease energy losses, transportation costs, and to increase product quality. Drying characteristics, chemical structure change, and energy consumption of low-rank coals as well as the affecting factors are discussed. This article represents a review of conventional fluidized bed drying technologies and additional field-assisted fluidized bed drying technologies, such as microwave, vibration, agitation, and acoustic field. Relative merits and limitations of the various additional fluidized bed drying technologies and the current state of their development are presented. Some of the unresolved problems are identified and directions for further research are suggested.
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