Study into influence of different types of igniters on the explosion parameters of dispersed nitrocellulose powder

Kuracina, Richard; Szabová, Zuzana; Kosár, László; Sahul, Martin

doi:10.1016/j.jlp.2023.105017

Cited by 8 publications

(1 citation statement)

References 25 publications

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“…It was probably caused by the action of a cloud of ignition particles, so called overdriving. [17,18] Different types of pepper have no effect on the safety characteristics used for secondary explosion protection, the minimum ignition temperature of dust layer and the minimum initiation energy.…”

Section: Discussionmentioning

confidence: 99%

Study on the Safety Characteristics of Different Types of Pepper (Capsicum L.)

Kosár,

Szabová,

Kuracina

et al. 2024

Preprint

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The research was aimed at comparing the fire characteristics of different types of pepper in the context of designing explosion prevention. The following characteristics were studied: explosion pressure pmax and Kst at selected concentrations, ignition temperature of the deposited dust layer from the hot surface and minimum initiation energy. The comparison of the chemical properties of the used types of pepper was performed using TG/DSC. Results of the measurements suggest that different types of peppers exhibit different explosion characteristics. Each of the samples reached the maximum value of the explosion pressure, and their rate of pressure rise increased at different concentrations. The volume of the explosion chamber used also influenced the explosion characteristics. It is a consequence of the fact that the explosion characteristics strongly depend on the mechanism of action of a particular igniter. The minimum effect on the safety characteristics was observed when measuring the minimum initiation energy and the minimum ignition temperature of dust layer from the hot surface. The results of the measurements suggest that different types of peppers exhibit different explosion characteristics. This information should then be considered in explosion prevention.

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Section: Discussionmentioning

confidence: 99%

Study on the Safety Characteristics of Different Types of Pepper (Capsicum L.)

Kosár,

Szabová,

Kuracina

et al. 2024

Preprint

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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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Study into influence of different types of igniters on the explosion parameters of dispersed nitrocellulose powder

Cited by 8 publications

References 25 publications

Study on the Safety Characteristics of Different Types of Pepper (Capsicum L.)

Study on the Safety Characteristics of Different Types of Pepper (Capsicum L.)

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

Testing of Dust and Dust Mixtures

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