Indexed by:Journal Article

Date of Publication:2014-05-01

Journal:JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES

Included Journals:EI、SCIE

Volume:29

Issue:1

Page Number:313-318

ISSN:0950-4230

Key Words:Methane/air explosion; Ultrafine water mist; Explosion enhancement; Explosion pressure

Abstract:Experiments about the influence of ultrafine water mist on the methane/air explosion were carried out in a fully sealed visual vessel with methane concentrations of 8%, 9.5%, 11% and 12.5%. Water mists were generated by two nozzles and the droplets' Sauter Mean Diameters (SMD) were 28.2 mu m and 43.3 mu m respectively which were measured by Phase Doppler Particle Anemometer (PDPA). A high speed camera was used to record the flame propagation processes. The results show that the maximum explosion overpressure, pressure rising rate and flame propagation velocity of methane explosions in various concentrations increased significantly after spraying. Furthermore, the brightness of explosion flame got much higher after spraying. Besides, the mist with a larger diameter had a stronger turbulent effect and could lead to a more violent explosion reaction. (C) 2014 Elsevier Ltd. All rights reserved.