### 抄録

This study investigates the effects of temperature gradient and coal particle size on the critical self-ignition temperature T_{CSIT} of a coal pile packed with low-rank coal using the wire-mesh basket test to estimate T_{CSIT} based on the Frank–Kamenetskii equation. The values of T_{CSIT}, the temperature gradient and the apparent activation energy of different coal pile volumes packed with coal particles of different sizes are measured. The supercriticality or subcriticality of the coal is assessed using a non-dimensional index I_{HR} based on the temperature gradient at the temperature cross-point between coal and ambient temperatures for coal piles with various volumes and particle sizes. The critical value I_{HRC} at the boundary between supercriticality and subcriticality is determined as a function of pile volume. The coal status of supercritical or subcritical can be separated by critical value of I_{HR} as a function of pile volume. Quantitative effects of coal particle size on T_{CSIT} of coal piles are measured for constant pile volume. It can be concluded that a pile packed with smaller coal particles is more likely to undergo spontaneous combustion, while the chemical activation energy is not sensitive to coal particle size. Finally, the effect of coal particle size on T_{CSIT} is represented by the inclusion of an extra term in the equation giving T_{CSIT} for a coal pile.

元の言語 | 英語 |
---|---|

記事番号 | 190374 |

ジャーナル | Royal Society Open Science |

巻 | 6 |

発行部数 | 9 |

DOI | |

出版物ステータス | 出版済み - 1 1 2019 |

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### All Science Journal Classification (ASJC) codes

- General

### これを引用

*Royal Society Open Science*,

*6*(9), [190374]. https://doi.org/10.1098/rsos.190374

**Effects of temperature gradient and particle size on self-ignition temperature of low-rank coal excavated from inner Mongolia, China.** / Wang, Yongjun; Zhang, Xiaoming; Zhang, Hemeng; Sasaki, Kyuro.

研究成果: ジャーナルへの寄稿 › 記事

*Royal Society Open Science*, 巻. 6, 番号 9, 190374. https://doi.org/10.1098/rsos.190374

}

TY - JOUR

T1 - Effects of temperature gradient and particle size on self-ignition temperature of low-rank coal excavated from inner Mongolia, China

AU - Wang, Yongjun

AU - Zhang, Xiaoming

AU - Zhang, Hemeng

AU - Sasaki, Kyuro

PY - 2019/1/1

Y1 - 2019/1/1

N2 - This study investigates the effects of temperature gradient and coal particle size on the critical self-ignition temperature TCSIT of a coal pile packed with low-rank coal using the wire-mesh basket test to estimate TCSIT based on the Frank–Kamenetskii equation. The values of TCSIT, the temperature gradient and the apparent activation energy of different coal pile volumes packed with coal particles of different sizes are measured. The supercriticality or subcriticality of the coal is assessed using a non-dimensional index IHR based on the temperature gradient at the temperature cross-point between coal and ambient temperatures for coal piles with various volumes and particle sizes. The critical value IHRC at the boundary between supercriticality and subcriticality is determined as a function of pile volume. The coal status of supercritical or subcritical can be separated by critical value of IHR as a function of pile volume. Quantitative effects of coal particle size on TCSIT of coal piles are measured for constant pile volume. It can be concluded that a pile packed with smaller coal particles is more likely to undergo spontaneous combustion, while the chemical activation energy is not sensitive to coal particle size. Finally, the effect of coal particle size on TCSIT is represented by the inclusion of an extra term in the equation giving TCSIT for a coal pile.

AB - This study investigates the effects of temperature gradient and coal particle size on the critical self-ignition temperature TCSIT of a coal pile packed with low-rank coal using the wire-mesh basket test to estimate TCSIT based on the Frank–Kamenetskii equation. The values of TCSIT, the temperature gradient and the apparent activation energy of different coal pile volumes packed with coal particles of different sizes are measured. The supercriticality or subcriticality of the coal is assessed using a non-dimensional index IHR based on the temperature gradient at the temperature cross-point between coal and ambient temperatures for coal piles with various volumes and particle sizes. The critical value IHRC at the boundary between supercriticality and subcriticality is determined as a function of pile volume. The coal status of supercritical or subcritical can be separated by critical value of IHR as a function of pile volume. Quantitative effects of coal particle size on TCSIT of coal piles are measured for constant pile volume. It can be concluded that a pile packed with smaller coal particles is more likely to undergo spontaneous combustion, while the chemical activation energy is not sensitive to coal particle size. Finally, the effect of coal particle size on TCSIT is represented by the inclusion of an extra term in the equation giving TCSIT for a coal pile.

UR - http://www.scopus.com/inward/record.url?scp=85073222814&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073222814&partnerID=8YFLogxK

U2 - 10.1098/rsos.190374

DO - 10.1098/rsos.190374

M3 - Article

AN - SCOPUS:85073222814

VL - 6

JO - Royal Society Open Science

JF - Royal Society Open Science

SN - 2054-5703

IS - 9

M1 - 190374

ER -