Influence of airflow movement on methane migration in coal mine goafs with spontaneous coal combustion

Lin Li, Botao Qin, Jishan Liu, Yee Kwong Leong, Wai Li, Jie Zeng, Dong Ma, Hui Zhuo

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Spontaneous coal combustion was proved to cause methane accumulation and methane explosions in coal mine goafs. To avoid possible methane explosions, the empirical engineering measure, ventilation dilution, is proposed in coal mines though its disaster prevention mechanism has not been well understood. Through experimental and numerical simulations, the superposition effect of the air leakage and coal combustion-induced chimney effect was studied to reveal disaster prevention effect of ventilation dilution. Research results show that the high temperature area of coal combustion is steady and can provide continuous buoyancy force to form upward airflow even under ventilation dilution; the drifting methane accumulation is observed under the superposition effect of air leakage and upward airflow; ventilation dilution can weaken and even eliminate methane accumulation by overcoming chimney effect, but an increase in coal combustion temperature will enhance the upward airflow of chimney effect to cause methane accumulation again. The competitive relationship between the coal combustion-induced chimney effect and air leakage provides a new insight to study methane migration for the disaster formation and prevention mechanism.

Original languageEnglish
Pages (from-to)405-416
Number of pages12
JournalProcess Safety and Environmental Protection
Volume156
DOIs
Publication statusPublished - Dec 2021

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