Influence of pre-ignition pressure rise on safety characteristics of dusts and hybrid mixtures

Spitzer, Stefan H.; Askar, Enis; Benke, Alexander; Janovsky, B.; Krause, Ulrich; Krietsch, Arne

doi:10.1016/j.fuel.2021.122495

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…Comparing the results of the lower explosion limit and the maximum explosion pressure determined with different ignition energies, the differences in the measured values are remarkable. Normally, a variation of the ignition energy shifts the lower explosion limit but not the explosion pressures or rates of pressure rise of dusts …”

Section: Resultsmentioning

confidence: 99%

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The Hazard of Soy Flour, n-Hexane, and Their Hybrid Mixtures in the Extraction Process

Spitzer,

Aghaei,

Askar

et al. 2024

Ind. Eng. Chem. Res.

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Soybean oil takes around half of the vegetable oil resources in the world, increasing in importance constantly. Besides, soy oil plants have experienced numerous accidents due to the coexistence of soy flour and hexane (as a solvent) in the extraction process, thus creating a hazardous environment. This study aims to find the maximum pressure, the maximum rate of pressure rise, and the minimum ignition energy of soy flour−hexane mixtures through specific experiments by varying the concentration of fuels in air and ignition mechanism (chemical igniters or exploding wires). The results have shown that soy flour alone is hard to ignite, whereas adding hexane even in small amounts increases the hazard and the severity of the explosions considerably. Eventually, the substitution of hexane with a greener and safer extraction agent should be of utmost focus.

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Section: Resultsmentioning

confidence: 99%

“…Normally, a variation of the ignition energy shifts the lower explosion limit but not the explosion pressures or rates of pressure rise of dusts. 40 The ignition energy was further reduced using two chemical igniters and an exploding wire. The reduction of the ignition energy had a severe impact on the explosion pressures.…”

Section: Particle Size Distributionmentioning

confidence: 99%

The Hazard of Soy Flour, n-Hexane, and Their Hybrid Mixtures in the Extraction Process

Spitzer,

Aghaei,

Askar

et al. 2024

Ind. Eng. Chem. Res.

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Decoupling pyrolysis and combustion of organic powders to determine the laminar flame speed

Pietraccini,

Santandrea,

Glaude

et al. 2024

Can J Chem Eng

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Determining the laminar flame speed of dusts is far from straightforward. A strong dependency on the experimental setup and the data treatment's high complexity makes it a true challenge. This work compares three complementary experimental setups to measure the laminar flame speed of organic dust (here, cellulose): a modified Hartmann tube, a 20 L sphere, and a micro‐fluidized bed (MFB) burner. The first two consider the flame propagation phenomenon in its globality, which means that numerous steps are involved simultaneously (particle heating, pyrolysis, oxidation, radiative transfer, flame stretching), while the third one decouples pyrolysis and combustion, to focus mainly on the oxidation rate. An MFB was conceived to generate pyrolysis products and burn them in a laminar flame. Unstretched flame velocities determined with the first two setups were consistent and equal to 22.0 and 26.6 cm ∙ s−1, respectively. Using Silvestrini's equation, values ranging between 14.0 and 33.4 cm ∙ s−1 were obtained according to the dust concentration. With the MFB burner, the flame speed was much higher (135–155 cm ∙ s−1), due to the higher temperature of the fresh mixture and the fact that only the oxidation of the pyrolysis gases is considered. A numerical simulation (Chemkin) confirmed these results since the range 135 to 231 cm ∙ s−1 was obtained for equivalence ratios of 0.6 and 1.2, respectively. The discrepancy between the laminar flame speed determined in the sphere or in the tube and that obtained in the MFB highlights the significant influence of particle heating and pyrolysis during a dust explosion.

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Testing of Dust and Dust Mixtures

Makovická Osvaldová,

Fatriasari

2023

The Society of Fire Protection Engineers Series

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Influence of pre-ignition pressure rise on safety characteristics of dusts and hybrid mixtures

Cited by 9 publications

References 12 publications

The Hazard of Soy Flour, n-Hexane, and Their Hybrid Mixtures in the Extraction Process

The Hazard of Soy Flour, n-Hexane, and Their Hybrid Mixtures in the Extraction Process

Decoupling pyrolysis and combustion of organic powders to determine the laminar flame speed

Testing of Dust and Dust Mixtures

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