Thermal radiation from vented dust explosions

Holbrow, P.; Hawksworth, Stuart; Tyldesley, A.

doi:10.1016/s0950-4230(99)00079-0

Cited by 28 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 10. Vented aluminum dust explosion test illustrating the very high emissivity of aluminum flames (Holbrow et al, 2000) ©Crown Copyright, Contains public sector information published by the Health and Safety Executive and licensed under the Open Government Licence Courtesy of Paul Holbrow, Health and Safety Laboratory, UK…”

Section: Recycling Of Exhaust Air Into Buildingsmentioning

confidence: 99%

Explosion hazards of aluminum finishing operations

Taveau

Hochgreb

Lemkowitz

et al. 2018

Journal of Loss Prevention in the Process Industries

View full text Add to dashboard Cite

Metal dust deflagrations have become increasingly common in recent years. They are also more devastating than deflagrations involving organic materials, owing to metals' higher heat of combustion, rate of pressure rise, explosion pressure and flame temperature. Aluminum finishing operations offer a particularly significant hazard from the very small and reactive aluminum particles generated, and thus require high attention to details of operation and explosion safety management. This paper presents available statistics on metal dust explosions and studies the specific explosion hazards of aluminum finishing operations. The analysis of seven case studies shows that the proper design, monitoring and maintenance of dust collection systems are particularly important. Furthermore, the isolation of deflagrations occurring in dust collection systems, as well as good housekeeping practices in buildings, are critical safeguards to avoid the occurrence of catastrophic secondary explosions.

show abstract

Section: Recycling Of Exhaust Air Into Buildingsmentioning

confidence: 99%

Explosion hazards of aluminum finishing operations

Taveau

Hochgreb

Lemkowitz

et al. 2018

Journal of Loss Prevention in the Process Industries

View full text Add to dashboard Cite

show abstract

“…Venting implies that both blast waves and flames are emitted into the surroundings, and this may present a hazard, depending on the size of the emitted flame and the magnitude of the blast wave. Several workers, including Forcier and Zalosh [93], Holbrow et al [94] and Harmanny [95], investigated various aspects of this problem. Various methods have been developed for eliminating hazardous effects of flames from vent openings.…”

Section: Explosion Ventingmentioning

confidence: 99%

Dust Explosion Prevention and Mitigation, Status and Developments in Basic Knowledge and in Practical Application

Eckhoff

2009

International Journal of Chemical Engineering

View full text Add to dashboard Cite

Right from the early days of the process industries, continuous efforts have been made to develop and improve measures for prevention and mitigation of dust explosions in these industries. Nevertheless this hazard continues to threaten industries that manufacture, use and/or handle powders and dusts of a wide range of combustible materials. To improve methods for predicting explosion development in real industrial plant has been one major challenge. Hence, during the last years comprehensive numerical simulation codes, for addressing this problem, have been developed. Progress has also been made in other areas, for example, ignition source prevention. The importance of adopting inherently safer process design, by building on firm knowledge in powder science and technology, and of systematic education/training of personnel, is also emphasized.

show abstract

“…The magnitude of the radiative flux can be expected to be of significant importance. The experimentally measured thermal radiation, caused by dust explosions, and reported values of a maximum surface emissive power are in the range 140 -556 kW/m 2 [37,38].…”

Section: Effect Of the Radiative Preheatingmentioning

confidence: 95%

Multipoint radiation induced ignition of dust explosions: turbulent clustering of particles and increased transparency

Liberman

Kleeorin

Haugen

2018

Combustion Theory and Modelling

View full text Add to dashboard Cite

It is known that unconfined dust explosions consist of a relatively weak primary (turbulent) deflagrations followed by a devastating secondary explosion. The secondary explosion may propagate with a speed of up to 1000 m/s producing overpressures of over 8-10 atm. Since detonation is the only established theory that allows a rapid burning producing a high pressure that can be sustained in open areas, the generally accepted view was that the mechanism explaining the high rate of combustion in dust explosions is deflagration to detonation transition. In the present work we propose a theoretical substantiation of the alternative propagation mechanism explaining origin of the secondary explosion producing the high speeds of combustion and high overpressures in unconfined dust explosions. We show that clustering of dust particles in a turbulent flow gives rise to a significant increase of the thermal radiation absorption length ahead of the advancing flame front. This effect ensures that clusters of dust particles are exposed to and heated by the radiation from hot combustion products of large gaseous explosions sufficiently long time to become multi-point ignition kernels in a large volume ahead of the advancing flame front. The ignition times of fuel-air mixture by the radiatively heated clusters of particles is considerably reduced compared to the ignition time by the isolated particle. The radiation-induced multi-point ignitions of a large volume of fuel-air ahead of the primary flame efficiently increase the total flame area, giving rise to the secondary explosion, which results in high rates of combustion and overpressures required to account for the observed level of overpressures and damages in unconfined dust explosions, such as e.g. the 2005 Buncefield explosion and several vapor cloud explosions of severity similar to that of the Buncefield incident.

show abstract

Thermal radiation from vented dust explosions

Cited by 28 publications

References 0 publications

Explosion hazards of aluminum finishing operations

Explosion hazards of aluminum finishing operations

Dust Explosion Prevention and Mitigation, Status and Developments in Basic Knowledge and in Practical Application

Multipoint radiation induced ignition of dust explosions: turbulent clustering of particles and increased transparency

Contact Info

Product

Resources

About