Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)
- Authors
- Park, Ju-Hyoung; Lee, Young-Joo; Jin, Min-Ho; Park, Se-Joon; Lee, Dong-Wook; Bae, Jong-Soo; Kim, Joeng-Geun; Song, Kwang Ho; Choi, Young-Chan
- Issue Date
- 1-9월-2017
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Coal; Gasification; Torrefaction; Coal water slurry (CWS); Porosity; Low-rank coal
- Citation
- FUEL, v.203, pp.607 - 617
- Indexed
- SCIE
SCOPUS
- Journal Title
- FUEL
- Volume
- 203
- Start Page
- 607
- End Page
- 617
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82283
- DOI
- 10.1016/j.fuel.2017.03.016
- ISSN
- 0016-2361
- Abstract
- To improve cold gas efficiency of entrained-flow gasification, coal water slurry (CWS) as a fuel must have high heating value at low viscosity. Especially, considering unstable supply of bituminous coal, the preparation of CWS with high coal content from low-rank coal remains a challenging topic. In this study, we report a remarkable improvement in coal content of CWS at low viscosity (1000 cP) through torrefaction of low-rank coal. Compared to dried coal (moisture-free coal), the torrefaction of low-rank coal leads to an improvement in hydrophobic nature of coal surface and a decrease in coal porosity. The moisture readsorption ratio of the torrefied low-rank coal significantly decreases due to its high hydrophobic nature and low porosity. As a result, Kideco coal showed a 6% and 58.7% increase in the coal content and heating value of CWS after torrefaction at 300 degrees C in comparison to those of CWS made with dried coal. Ultimately, the torrefied coal-based CWS with enhanced coal content and heating value at low viscosity is expected to contribute to an increase in the efficiency of a gasifier and IGCC process. (C) 2017 Published by Elsevier Ltd.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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