Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)

Ju Hyoung Park; Young Joo Lee; Min Ho Jin; Se Joon Park; Dong Wook Lee; Jong Soo Bae; Joeng Geun Kim; Kwang Ho Song; Young Chan Choi

doi:10.1016/j.fuel.2017.03.016

Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)

Ju Hyoung Park, Young Joo Lee, Min Ho Jin, Se Joon Park, Dong Wook Lee, Jong Soo Bae, Joeng Geun Kim, Kwang Ho Song, Young Chan Choi

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

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 °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.

Original language	English
Pages (from-to)	607-617
Number of pages	11
Journal	Fuel
Volume	203
DOIs	https://doi.org/10.1016/j.fuel.2017.03.016
Publication status	Published - 2017

Bibliographical note

Funding Information:
This work was supported by a primary project of the Korea Institute of Energy Research (KIER), and the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

Keywords

Coal
Coal water slurry (CWS)
Gasification
Low-rank coal
Porosity
Torrefaction

ASJC Scopus subject areas

General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
Organic Chemistry

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10.1016/j.fuel.2017.03.016

Cite this

@article{b41fb70d726b4d769d86e551bd430061,

title = "Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)",

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 °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.",

keywords = "Coal, Coal water slurry (CWS), Gasification, Low-rank coal, Porosity, Torrefaction",

author = "Park, {Ju Hyoung} and Lee, {Young Joo} and Jin, {Min Ho} and Park, {Se Joon} and Lee, {Dong Wook} and Bae, {Jong Soo} and Kim, {Joeng Geun} and Song, {Kwang Ho} and Choi, {Young Chan}",

note = "Funding Information: This work was supported by a primary project of the Korea Institute of Energy Research (KIER), and the Korea Institute of Energy Technology Evaluation and Planning (KETEP).",

year = "2017",

doi = "10.1016/j.fuel.2017.03.016",

language = "English",

volume = "203",

pages = "607--617",

journal = "Fuel",

issn = "0016-2361",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)

AU - Park, Ju Hyoung

AU - Lee, Young Joo

AU - Jin, Min Ho

AU - Park, Se Joon

AU - Lee, Dong Wook

AU - Bae, Jong Soo

AU - Kim, Joeng Geun

AU - Song, Kwang Ho

AU - Choi, Young Chan

N1 - Funding Information: This work was supported by a primary project of the Korea Institute of Energy Research (KIER), and the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

KW - Coal

KW - Coal water slurry (CWS)

KW - Gasification

KW - Low-rank coal

KW - Porosity

KW - Torrefaction

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JO - Fuel

JF - Fuel

ER -

Enhancement of slurryability and heating value of coal water slurry (CWS) by torrefaction treatment of low rank coal (LRC)

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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