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Fire Technology

, Volume 55, Issue 1, pp 175–191 | Cite as

Influence of Particle Size and Density on the Hot Surface Ignition of Solid Fuel Layers

  • Nieves Fernandez-Anez
  • Javier Garcia-Torrent
Article

Abstract

Dust layers are present in every industrial facility where solid materials are generated or processed. The emergence of new fuels with still unknown flammability properties generates an increase on the risks related with these facilities that needs to be further studied. Most of these biomasses are susceptible to exothermically react, acting as an ignition source and causing fires and explosions. One of the most common causes of explosions is the ignition of dust layers deposited on the equipment, which could be avoided by a better understanding of the materials. However, the ignitability of these layers depend on several parameters as the particle size and the density of the deposited materials. This paper reports experimental work on hot surface ignition temperatures of layers of different fuels, both biofuels, such as wood or sewage sludge, and fossil fuels, coal and coke. It shows that the common practices that are well-known for fossil fuels cannot be directly extrapolated to new fuels. Unlike fossil fuels, wood-based materials present the same ignition risk in dust and bulk size, so an increase on the particle size does not ensure a safer work space. Furthermore, compacting these materials can increase the ignition risk of these type of layers, contrary to the common practices for fossil fuels storages. These differences point out the need of a complete characterisation of each material to ensure a safe working facility.

Keywords

Ignition Compaction Fuels Layer Hot surface 

Notes

References

  1. 1.
    Amyotte PR (2014) Some myths and realities about dust explosions. Process Saf Environ Prot 92(4): 292–299CrossRefGoogle Scholar
  2. 2.
    Abbasi T, Abbasi S (2007) Dust explosions–cases, causes, consequences, and control. J Hazard Mater 140(1): 7–44CrossRefGoogle Scholar
  3. 3.
    IEC 60079-10-2:2015 (2015) Explosive atmospheres: part 10-2: classification of areas: explosive dust atmospheresGoogle Scholar
  4. 4.
    EN 1127-1 (2011) Explosive atmospheres. Explosion prevention and protection. Basic concepts and methodologyGoogle Scholar
  5. 5.
    Bowes P, Townshend S (1962) Ignition of combustible dusts on hot surfaces. Br J Appl Phys 13(3): 105CrossRefGoogle Scholar
  6. 6.
    Gummer J, Lunn G (2003) Ignitions of explosive dust clouds by smouldering and flaming agglomerates. J Loss Prev Process Ind 16(1): 27–32CrossRefGoogle Scholar
  7. 7.
    Querol E, Torrent J, Bennett D, Gummer J, Fritze J-P (2006) Ignition tests for electrical and mechanical equipment subjected to hot surfaces. J Loss Prev Process Ind 19(6): 639–644CrossRefGoogle Scholar
  8. 8.
    EN 50281-2-1 (1999) Electrical apparatus for use in the presence of combustible dust-part 2-1: test methods—methods of determining minimum ignition temperaturesGoogle Scholar
  9. 9.
    Zhu H-q, Song Z-y, Tan B, Hao Y-z (2013) Numerical investigation and theoretical prediction of self-ignition characteristics of coarse coal stockpiles. J Loss Prev Process Ind 26(1): 236–244CrossRefGoogle Scholar
  10. 10.
    Eckhoff RK (2009) Understanding dust explosions. The role of powder science and technology. J Loss Prevent Proc 22(1): 105–116CrossRefGoogle Scholar
  11. 11.
    Fierro V et al (1999) Prevention of spontaneous combustion in coal stockpiles: experimental results in coal storage yard. Fuel Process Technol 59(1): 23–34CrossRefGoogle Scholar
  12. 12.
    Astbury G (2008) A review of the properties and hazards of some alternative fuels. Process Saf Environ Prot 86(6): 397–414CrossRefGoogle Scholar
  13. 13.
    Lam PY, Lam PS, Sokhansanj S, Bi XT, Lim CJ, Melin S (2014) Effects of pelletization conditions on breaking strength and dimensional stability of Douglas fir pellet. Fuel 117: 1085–1092CrossRefGoogle Scholar
  14. 14.
    Bates RB, Ghoniem AF (2012) Biomass torrefaction: modeling of volatile and solid product evolution kinetics. Biores Technol 124: 460–469CrossRefGoogle Scholar
  15. 15.
    Merkus HG (2009) Particle size measurements: fundamentals, practice, quality. Springer, BerlinGoogle Scholar
  16. 16.
    Reddy PD, Amyotte PR, Pegg MJ (1998) Effect of inerts on layer ignition temperatures of coal dust. Combust Flame 114(1): 41–53CrossRefGoogle Scholar
  17. 17.
    Guo W (2013) Self-heating and spontaneous combustion of wood pellets during storage. University of British Columbia, VancouverGoogle Scholar
  18. 18.
    Krause U, Schmidt M, Lohrer C (2006) A numerical model to simulate smouldering fires in bulk materials and dust deposits. J Loss Prev Process Ind 19(2): 218–226CrossRefGoogle Scholar
  19. 19.
    IEA Bioenenergy (2013) Health and safety aspects of solid biomass storage, transportation and feedingGoogle Scholar
  20. 20.
    Wilén C et al (1999) Safe handling of renewable fuels and fuel mixtures. Technical Research Centre of Finland, EspooGoogle Scholar
  21. 21.
    Collazo J, Pazó JA, Granada E, Saavedra Á, Eguía P (2012) Determination of the specific heat of biomass materials and the combustion energy of coke by DSC analysis. Energy 45(1): 746–752CrossRefGoogle Scholar
  22. 22.
    Warnsloh JM (2015) TriAngle: A Microsoft Excel™ spreadsheet template for the generation of triangular plots. Neues Jahrb für Mineral Abh J Mineral Geochem 192(1): 101–105Google Scholar
  23. 23.
    Huescar Medina C, Phylaktou HN, Sattar H, Andrews GE, Gibbs B (2013) Torrefaction effects on the reactivity and explosibility of woody biomass. In: Proceedings of the 7th international seminar on fire and explosion hazards. Providence, RIGoogle Scholar
  24. 24.
    Stelte W, Holm JK, Sanadi AR, Barsberg S, Ahrenfeldt J, Henriksen UB (2011) Fuel pellets from biomass: the importance of the pelletizing pressure and its dependency on the processing conditions. Fuel 90(11): 3285–3290CrossRefGoogle Scholar
  25. 25.
    Jiang L et al (2014) Co-pelletization of sewage sludge and biomass: the density and hardness of pellet. Biores Technol 166: 435–443CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Energy and FuelsUniversidad Politecnica de MadridMadridSpain
  2. 2.Department of Mechanical EngineeringImperial CollegeLondonUK
  3. 3.Laboratorio Oficial MadariagaUniversidad Politecnica de MadridGetafe, MadridSpain

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