2019/11/05 by Song Lin, Zhentang Liu, Jifa Qian +2 · 1 citation
Decision Sciences · Engineering · #Combustion and Detonation Processes #Fire dynamics and safety research #Risk and Safety Analysis
paper · doi:10.1080/00102202.2019.1688313
crossref issued 2019/11/05 · crossref published 2019/11/05 · crossref published-online 2019/11/05 · openalex publication_date 2019/11/05 · crossref created 2019/11/05 · crossref deposited 2021/05/11 · crossref published-print 2021/06/11 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/31
The post-explosion gaseous environment in a coal mine influences the occurrence of secondary explosions. The flammable and explosion risk of post-explosion gases (CH4/air and CH4/coal dust/air mixtures) was evaluated. Explosion tests were carried out in a 20-L spherical explosion device under conditions with different air-fuel ratios. The composition and volume fraction of post-explosion gases were collected and analyzed. CO and H2 are two main possible flammable gas products with increasing initial fuel-air ratio. Unexpectedly, H2 was generated after a CH4/air explosion when the initial φ(CH4) ≥ 13%, in which condition the concentration of O2 was far from sufficient to oxidize CH4. The volume fraction of flammable gas in residual gases of CH4/coal dust/air mixture explosions was higher than that of CH4/air mixtures. It was found that the secondary explosion risk increased significantly when coal dust was involved in a methane explosion. The lower explosion limit (LEL) of post-explosion flammable gases decreased with the increasing mass concentration of coal dust. The flammable component of such post-explosion gases affected the secondary explosion.