Minimum Ignition Temperature of layer and cloud dust mixtures

Danzi, Enrico; Marmo, Luca; Riccio, Daniela

doi:10.1016/j.jlp.2015.04.003

Cited by 59 publications

(11 citation statements)

References 16 publications

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“…The HR 320–600 predominates the heat transfer process, and the graphite–starch blended dust exhibit enhanced heat release in comparison to that of S0, but the reduced HRR reveals that the added graphite imparts fire‐shielding and barrier effect to the combustion of starch, due to the non‐equilibrium condition during combustion in CC. Because the initiation of breakdown of starch chain is a non‐oxidative process, the shielding effect of EG might retard the breaking of bonds in copolymers due to the formation of fluffy and porous worm‐like barriers on the surface of starch, evidenced by the rapid improvement of T 0.05 , which increases from 106 to146 °C.…”

Section: Resultsmentioning

confidence: 99%

“…studied the dispersion and combustion of wheat starch and carbon black particles during the standard 20 L sphere. In general, inert materials mainly follow the modes of physical and chemical action . The physical action generates a heat sink by absorbing heat and thermal radiation essentially, which obviously limits or even stops the course of the combustion, while the chemical action mainly hinders radical propagation through a gaseous phase and a condensed phase, which isolates the combustible volatiles by intumescent carbonaceous layers generated derived from the transformations of inhibitors.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Explosion and Combustion of Various Carbon–Starch Blended Dust

et al. 2020

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The effect of different carbon allotropes on the explosion and combustion of potato‐starch dust is preliminarily investigated by modified Hartmann tube and cone calorimeter (CC), using expandable graphite (EG), naturally flaky graphite, vermicular graphite, and carbon black as the dust suppressants, respectively. The results show that the maximum explosion pressure (Pmax) decreases from 0.66 to 0.39 MPa and the peak heat release rate reduces from 31.45 to13.64 kW·m−2 for the EG‐starch blended dust, due to the physically shielding effect of the fluffy and charring layer. It clarifies that the combustion of starch is mainly governed by Zhuralev–Lesokin–Tempelman 3D diffusion calculated by the modified Coats–Redfern integral method; the carbonaceous materials block the pyrolysis and migration of volatiles, leading to a decrease in DTGmax. It establishes a comprehensive method to evaluate the explosion and combustion of organic combustible dust, combining the CC with combustion kinetics effectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Explosion and Combustion of Various Carbon–Starch Blended Dust

et al. 2020

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“…The experiments were performed on a laboratory hot plate apparatus with temperature controller, type CLARE 4.0, with measurement errors of ±0.3 • C (Clasic, Czech Republic) in the experimental laboratory at the Faculty of Safety Engineering in Žilina (Slovakia). Detailed information about the behavior test is available in [38,39].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Marblewood Dust’s (Marmaroxylon racemosum) Effect on Ignition Risk

et al. 2021

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The paper deals with the selected characteristics, such as moisture, average bulk density, and fraction size, of tropical marblewood dust (Marmaroxylon racemosum) that influence its ignition risk. Research was focused on sieve analysis, granulometric analysis, measurement of moisture level in the dust, and determination of the minimum ignition temperatures of airborne tropical dust and dust layers. Samples were prepared using a Makita 9556CR 1400W grinder and K36 sandpaper for the purpose of selecting the percentages of the various fractions (<63, 63, 71, 100, 200, 315, 500 μm). The samples were sized on an automatic vibratory sieve machine Retsch AS 200. More than 65% of the particles were determined to be under 100 μm. The focus was on microfractions of tropical wood dust (particles with a diameter of ≤100 µm) and on the impact assessment of particle size (particle size <100 µm) on the minimum ignition temperatures of airborne tropical dust and dust layers. The minimum ignition temperature of airborne marblewood dust decreased with the particle size to the level of 400 °C (particle size 63 μm).

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“…Solid dusts present ignition and combustion properties that have to be determined and understood for the design of fire and explosion prevention and protection measures needed in such facilities [21]. Some researchers have studied the flammability behaviour of mixtures of dusts, mainly with an inert dust [22][23][24]. By mixing any flammable dust with inert dusts, the ignition tendency can be decreased, but the influence that mixing two or more flammable dusts has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Ignition sensitivity of solid fuel mixtures

Fernandez-Añez

Slatter

Saeed

et al. 2018

Fuel

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Due to both environmental concerns and the depletion of the reserves of fossil fuels, alternative and more environmentally friendly fuels, such as biomass and waste products, are being considered for partial or full fossil fuel replacement. The main disadvantage of these products is their lower energy density compared to fossil fuels. To deal with this several heat and power generation facilities are co-firing fuel mixtures.These processes involve mixtures of flammable dusts whose ignitability and explosibility characteristics are not known and therefore present un-quantified safety risk to the new technologies.This study reports on these risks and on the reactivity characteristics of two and three components dust mixtures of coal / sewage-sludge / torrefied-wood-pellet. In particular chemical composition, ignition sensitivity parameters (including minimum ignition energy, minimum ignition temperature on a layer, minimum explosive concentration) and flame speed have been determined. In all cases the measured parameters for the mixtures were within the range defined by the lower and upper value of the constituent.However, the expected values do not agree with the experimentally obtained ones, providing more relaxed values than the ones needed on this facilities.

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Minimum Ignition Temperature of layer and cloud dust mixtures

Cited by 59 publications

References 16 publications

Investigation on the Explosion and Combustion of Various Carbon–Starch Blended Dust

Investigation on the Explosion and Combustion of Various Carbon–Starch Blended Dust

Evaluation of Marblewood Dust’s (Marmaroxylon racemosum) Effect on Ignition Risk

Ignition sensitivity of solid fuel mixtures

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