Indexed by:期刊论文

Date of Publication:2012-11-01

Journal:SAFETY SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:50

Issue:9

Page Number:1786-1791

ISSN No.:0925-7535

Key Words:Methane; Obstacles; Deposited coal dust; Explosion

Abstract:An experimental system including pressure transducer, electric spark ignition device, data acquisition and control unit was set up to investigate methane-air explosions in a horizontal pipe closed at both ends with or without the presence of obstacles and deposited coal dust. The experimental results show that explosion characteristics depended on the methane content, on the layout of obstacles, and on the deposited coal dust. Pressure fluctuation with a frequency of 150 Hz appeared in its crest when the methane content was close to the stoichiometric ratio (9.5% methane percentage by volume). The pressure rise rate increased locally when a single obstacle was mounted in the pipe, but it had little effect on the pressure peak. Repeated obstacles mounted in the pipe caused the pressure to rise sharply, and the mean maximum explosion overpressure increased with the increase of the obstacle's number. The amplitude of pressure fluctuation was reduced when deposited coal dust was paved in the bottom of the pipe. However, when repeated obstacles were arranged inside, the maximum overpressures were higher with coal dust deposited than pure gas explosions. (C) 2012 Elsevier Ltd. All rights reserved.