Determination of critical self-ignition temperature of low-rank coal using a 1 m wire-mesh basket and extrapolation to industrial coal piles

Yongjun Wang, Xiaoming Zhang, Yuichi Sugai, Kyuro Sasaki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Spontaneous combustion of coal stockpiles can occur when the environment temperature exceeds the critical self-ignition temperature (CSIT), which strongly depends on the pile volume. Measurements of the self-heating rates of a low-rank coal were carried out at various ambient air temperatures using pile heights of 2.5 to 10 cm (laboratory-scale) and 25 to 100 cm (large-scale), simulated using cubic wire-mesh baskets of different sizes. The experimental results demonstrated the feasibility of using the established Frank-Kamenetskii model in prediction of coal pile self-ignition. The larger-scale experiments showed quite different temperature variations during the heating process compared with the laboratory-scale experiments. Gas emissions and height changes of the piles revealed characteristics of the different stages of heating. Analysis of data obtained from the larger-scale tests demonstrated that prediction of CSIT based on laboratory experiments is reliable and useful. Relationships for CSIT and safe storage time of the coal are proposed as a function of stockpile volume for volumes up to 100 m3.

Original languageEnglish
Pages (from-to)6700-6710
Number of pages11
JournalEnergy and Fuels
Volume31
Issue number7
DOIs
Publication statusPublished - Jul 20 2017

All Science Journal Classification (ASJC) codes

  • Fuel Technology

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