Hydrocarbon Aerosol Explosion Hazards: A Review

Potential explosion hazards arising from releases of natural gas are now reasonably well understood, but the hazards exhibited by two-phase liquid-vapour mixtures are often overlooked. A number of explosions believed to be two-phase in nature have occurred within the process industries, so emphasizing the need to investigate the underlying mechanisms which contribute to aerosol explosions. It has been predicted that an aerosol containing droplets within the so-called ‘transition‘ range, typically between 7−15 μm, may burn faster than an optimally mixed homogeneous vapour/air mixture. Other models predict that the burning velocity attained for a gaseous mixture is the maximum attainable. A few experimental publications discuss the generation and combustion of fuel aerosols, but have failed to examine the area of most interest. This paper reviews previous theoretical, experimental and computational approaches relating aerosol explosions, and presents a research strategy suitable for progression towards robust quantification of this category of explosion.

[1]  C. Law,et al.  An Ignition Criterion for Droplets in Sprays , 1980 .

[2]  Y. Tambour,et al.  Stoichiometry and polydisperse effects in premixed spray flames , 1993 .

[3]  N. Rogov,et al.  Combustion of large volumes of dispersed fuels and the evolution of their products in the free atmosphere , 1989 .

[4]  Y. Mizutani,et al.  Combustion of fuel vapor-drop-air systems: Part I—Open burner flames , 1973 .

[5]  C. T. R. Wilson.  Condensation of Water Vapour in the Presence of Dust-Free Air and Other Gases , 1897 .

[6]  W. Sirignano,et al.  Unsteady spray flame propagation in a closed volume , 1985 .

[7]  Shinpei Hayashi,et al.  Propagation Velocity and Structure of Flames in Droplet-Vapor-Air Mixtures , 1977 .

[8]  J. Greenberg.  A new heterogeneous burning velocity formula for the propagation of a laminar flame front through a , 1996 .

[9]  Asymptotic analysis of a premixed polydisperse spray flame , 1991 .

[10]  K. Chan,et al.  An experimental and theoretical investigation of the transition phenomenon in fuel spray deflagration: 1. The experiment , 1989 .

[11]  C. Polymeropoulos.  Flame Propagation in Aerosols of Fuel Droplets, Fuel Vapor and Air , 1984 .

[12]  S. Skippon,et al.  Effects of Fuel Composition on In-Cylinder Air/Fuel Ratio During Fuelling Transients in an SI Engine, Measured Using Differential Infra-Red Absorption , 1996 .

[13]  A. W. Lemmon,et al.  Progress in ASTRONAUTICS and ROCKETRY , 1961 .

[14]  Philip John Bowen,et al.  Deflagration of Hydrocarbon Aerosol Fuels , 1997 .

[15]  Philip John Bowen,et al.  Combustion hazards posed by the pressurized atomization of high-flashpoint liquids , 1994 .

[16]  Ta-Hui Lin,et al.  Theory of laminar flame propagation in near-stoichiometric dilute sprays , 1991 .

[17]  W. Sirignano,et al.  Flame propagation through an air-fuel spray mixture with transient droplet vaporization , 1980 .