Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)
In: Fuel, Jg. 203 (2017-09-01), S. 607-617
Online
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Zugriff:
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 °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.
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Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)
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Autor/in / Beteiligte Person: | Se Joon Park ; Lee, Dong-Wook ; Jong Soo Bae ; Young Joo Lee ; Park, Ju-Hyoung ; Joeng Geun Kim ; Min Ho Jin ; Young Chan Choi ; Kwang Ho Song |
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Zeitschrift: | Fuel, Jg. 203 (2017-09-01), S. 607-617 |
Veröffentlichung: | Elsevier BV, 2017 |
Medientyp: | unknown |
ISSN: | 0016-2361 (print) |
DOI: | 10.1016/j.fuel.2017.03.016 |
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