http://orcid.org/0000-0001-5868-4503
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ABSTRACT
In this study, a Turkish lignite (the Konya-Ilgın lignite) was used to study its drying characteristics in a fixed-bed dryer. The drying experiments were conducted with coarse lignite particles for utilization in the heating sector. In this study, the effects of the drying-air temperature and velocity were investigated. The particle sizes inside the bed were kept constant in the experiments, which was different from the previous works cited in the literature. The results showed that the drying-air temperature and velocity significantly influence the drying process. The drying time was reduced by increasing the air temperature and velocity. Additionally, drying of Konya-Ilgın lignite did not show an explicit constant-drying-rate stage. It showed the falling-drying-rate stage only despite containing more than 50% moisture by weight. This situation is different from most of the studies in the coal-drying literature.
Nomenclature
| Ps | = | Pressure measurement (-) |
| Ts | = | Temperature measurement (-) |
| Hs | = | Relative humidity measurement (-) |
| H | = | Bed height (mm) |
| S | = | Particle size (mm) |
| T | = | Air temperature (°C) |
| V | = | Air velocity (m/s) |
| M | = | moisture content in wet basis (g moisture/g wet coal) |
| Wt | = | dry-coal weight at different time intervals (g) |
| W0 | = | initial sample weight (g) |
| DR | = | drying rate (g moisture/g wet coal∙min) |
| MR | = | moisture ratio (-) |
Acknowledgment
The authors would like to acknowledge Prof. Dr. İsmail Teke for valuable comments on experimental results as a member of the first Author’s PhD committee and Dr. Mustafa Tahir Akkoyunlu for his help during the experimental works. The authors greatly acknowledge Dr. B. K. Parekh for invaluable contribution to this work.
Funding
The authors also acknowledge the Scientific and Technological Research Council of Turkey (TUBITAK; Project no. 1120278), Yildiz Technical University Scientific Research Projects Coordination Department (Project no. 2012-06-01-DOP01 and 2014-06-01-DOP02), and Prof. Dr. Bahri Şahin from the Turkish Academy of Sciences (TUBA) for their financial support.