Physical decoupling and kinetic mechanisms of the combustion inertness of pressurized coal gasification fine slag

Xin Yang; Chujun Chen; Zhengqi Li

doi:10.1016/j.fuel.2026.140804

Physical decoupling and kinetic mechanisms of the combustion inertness of pressurized coal gasification fine slag

Xin Yang
, Chujun Chen
, Zhengqi Li^*

^*Corresponding author for this work

School of Energy Science and Engineering

School of Energy Science and Engineering, Harbin Institute of Technology
Harbin Institute of Technology

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

Abstract

Pressurized coal gasification fine slag (PGFS) shows low combustion reactivity due to ash encapsulation. Using gravity separation, high-carbon PGFS-HC was obtained with ash content reduced to 10.73 wt% and S_BET increased to 253 m²·g⁻¹. Its comprehensive combustion index S increased from 0.09 × 10⁻⁸ to 14.84 × 10⁻⁸. TG-MS analysis shows that the CO₂ release peak in PGFS-HC coincides with the DTG peak, whereas it is delayed in raw PGFS, indicating that mass transfer limitation rather than carbon graphitization dominates combustion inertness. These results demonstrate that targeted removal of the physical ash barrier is key to improving PGFS combustion and enables cascade utilization of high-carbon and high-ash fractions.

Original language	English
Article number	140804
Journal	Fuel
Volume	429
DOIs	https://doi.org/10.1016/j.fuel.2026.140804
State	Published - Feb 2027

Keywords

Combustion reactivity
Gravity separation
Kinetics
Physical barrier
Pressurized coal gasification fine slag

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10.1016/j.fuel.2026.140804

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@article{f5ee0a7e0f224e37b06d2802e9a41081,

title = "Physical decoupling and kinetic mechanisms of the combustion inertness of pressurized coal gasification fine slag",

abstract = "Pressurized coal gasification fine slag (PGFS) shows low combustion reactivity due to ash encapsulation. Using gravity separation, high-carbon PGFS-HC was obtained with ash content reduced to 10.73 wt\% and SBET increased to 253 m2·g−1. Its comprehensive combustion index S increased from 0.09 {\texttimes} 10−8 to 14.84 {\texttimes} 10−8. TG-MS analysis shows that the CO2 release peak in PGFS-HC coincides with the DTG peak, whereas it is delayed in raw PGFS, indicating that mass transfer limitation rather than carbon graphitization dominates combustion inertness. These results demonstrate that targeted removal of the physical ash barrier is key to improving PGFS combustion and enables cascade utilization of high-carbon and high-ash fractions.",

keywords = "Combustion reactivity, Gravity separation, Kinetics, Physical barrier, Pressurized coal gasification fine slag",

author = "Xin Yang and Chujun Chen and Zhengqi Li",

note = "Publisher Copyright: Copyright {\textcopyright} 2026. Published by Elsevier Ltd.",

year = "2027",

month = feb,

doi = "10.1016/j.fuel.2026.140804",

language = "英语",

volume = "429",

journal = "Fuel",

issn = "0016-2361",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Physical decoupling and kinetic mechanisms of the combustion inertness of pressurized coal gasification fine slag

AU - Yang, Xin

AU - Chen, Chujun

AU - Li, Zhengqi

PY - 2027/2

Y1 - 2027/2

N2 - Pressurized coal gasification fine slag (PGFS) shows low combustion reactivity due to ash encapsulation. Using gravity separation, high-carbon PGFS-HC was obtained with ash content reduced to 10.73 wt% and SBET increased to 253 m2·g−1. Its comprehensive combustion index S increased from 0.09 × 10−8 to 14.84 × 10−8. TG-MS analysis shows that the CO2 release peak in PGFS-HC coincides with the DTG peak, whereas it is delayed in raw PGFS, indicating that mass transfer limitation rather than carbon graphitization dominates combustion inertness. These results demonstrate that targeted removal of the physical ash barrier is key to improving PGFS combustion and enables cascade utilization of high-carbon and high-ash fractions.

AB - Pressurized coal gasification fine slag (PGFS) shows low combustion reactivity due to ash encapsulation. Using gravity separation, high-carbon PGFS-HC was obtained with ash content reduced to 10.73 wt% and SBET increased to 253 m2·g−1. Its comprehensive combustion index S increased from 0.09 × 10−8 to 14.84 × 10−8. TG-MS analysis shows that the CO2 release peak in PGFS-HC coincides with the DTG peak, whereas it is delayed in raw PGFS, indicating that mass transfer limitation rather than carbon graphitization dominates combustion inertness. These results demonstrate that targeted removal of the physical ash barrier is key to improving PGFS combustion and enables cascade utilization of high-carbon and high-ash fractions.

KW - Combustion reactivity

KW - Gravity separation

KW - Kinetics

KW - Physical barrier

KW - Pressurized coal gasification fine slag

UR - https://www.scopus.com/pages/publications/105045468246

U2 - 10.1016/j.fuel.2026.140804

DO - 10.1016/j.fuel.2026.140804

M3 - 文章

AN - SCOPUS:105045468246

SN - 0016-2361

VL - 429

JO - Fuel

JF - Fuel

M1 - 140804

ER -

Physical decoupling and kinetic mechanisms of the combustion inertness of pressurized coal gasification fine slag

Abstract

Keywords

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