DBPapers
DOI: 10.5593/SGEM2014/B13/S3.086

THE EFFECTS OF EXPLOSIONS ON THE UNDERGROUND VENTILATION SYSTEM

M. S. Morar, S. M. Radu, D. Cioclea, T. Mititica
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 665-672 pp

ABSTRACT
During the process of extracting coal there are released significant quantities of
flammable gas which may lead to the occurrence of the explosion type phenomena. For an explosive mixture of air-methane, the source of initiation must submit activation energy between 125.4 and 292.4 Kj/mol and for the initiation and the propagation of an explosion in a coal dust-air explosive mixture, the heat necessary for the propagation reaction must be higher than 1,775 Kj/m3. In underground mining works, in relation with the flammable substance there may occur the following types of explosions:

  • Methane explosions;
  • Coal dust explosions;
  • Methane and coal dust explosions. The explosion type event occurring underground produces a dynamic shockwave which is radially propagated on the path of the mine workings both towards the main ventilation station and of the mine workings for fresh air entrance.During the playback of the explosion type phenomena there occurs heat, dynamic effects and chemical effects over the air, effects which change the air flow and the mine air composition.

Keywords: building, construction, explosion, underground, ventilation