Preconditioning of Dust and Fluid in a 20 L Chamber During Ignition by a Chemical Ignitor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00007064%3AK02__%2F25%3AN0000104" target="_blank" >RIV/00007064:K02__/25:N0000104 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216275:25310/25:39923492

Výsledek na webu

<a href="https://www.mdpi.com/2571-6255/8/9/336" target="_blank" >https://www.mdpi.com/2571-6255/8/9/336</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/fire8090336" target="_blank" >10.3390/fire8090336</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Preconditioning of Dust and Fluid in a 20 L Chamber During Ignition by a Chemical Ignitor

Popis výsledku v původním jazyce

Dust explosion prevention and mitigation of the consequences thereof require measurement of dust explosion parameters. Testing methods are defined by European and American standards, producing results in explosion chambers of a 1 m3 standard volume and, alternatively, 20 L. However, the results are influenced by some processes that are neglected by the standards, perhaps because it is believed that their effect is small in a 1 m3 chamber. But their effect becomes significant in a smaller 20 L chamber. Preconditioning of the system caused by dust dispersion itself, as well as the ignitor flame, is one such problem. The aim of this work is to further investigate the physical and chemical processes caused by dust preheating after an ignitor’s action. Analytical methods, such as STA, GC/MS and FTIR, were used to analyse the composition of the atmosphere after exposure of lycopodium dust, a natural material, to certain temperatures up to 550 °C in air and nitrogen. In the second step, gas samples were taken from the 20 L chamber after dispersion of lycopodium and ignition by two 5 kJ pyrotechnical ignitors. Depending on the temperature and atmosphere, various concentrations of CO, CO2, H2O, NOx and organic compounds were measured. It was observed that the dispersed dust decomposed into mostly CO and CO2 in the area near the ignitors, even in an atmosphere in which the oxygen concentration was lower than 2% by volume. The concentrations of other organic compounds were very low and included mostly methane, ethylene and acetaldehyde. However, when incorporating CO, the overall concentration of flammables was high enough to generate a hybrid mixture.

Název v anglickém jazyce

Preconditioning of Dust and Fluid in a 20 L Chamber During Ignition by a Chemical Ignitor

Popis výsledku anglicky

Dust explosion prevention and mitigation of the consequences thereof require measurement of dust explosion parameters. Testing methods are defined by European and American standards, producing results in explosion chambers of a 1 m3 standard volume and, alternatively, 20 L. However, the results are influenced by some processes that are neglected by the standards, perhaps because it is believed that their effect is small in a 1 m3 chamber. But their effect becomes significant in a smaller 20 L chamber. Preconditioning of the system caused by dust dispersion itself, as well as the ignitor flame, is one such problem. The aim of this work is to further investigate the physical and chemical processes caused by dust preheating after an ignitor’s action. Analytical methods, such as STA, GC/MS and FTIR, were used to analyse the composition of the atmosphere after exposure of lycopodium dust, a natural material, to certain temperatures up to 550 °C in air and nitrogen. In the second step, gas samples were taken from the 20 L chamber after dispersion of lycopodium and ignition by two 5 kJ pyrotechnical ignitors. Depending on the temperature and atmosphere, various concentrations of CO, CO2, H2O, NOx and organic compounds were measured. It was observed that the dispersed dust decomposed into mostly CO and CO2 in the area near the ignitors, even in an atmosphere in which the oxygen concentration was lower than 2% by volume. The concentrations of other organic compounds were very low and included mostly methane, ethylene and acetaldehyde. However, when incorporating CO, the overall concentration of flammables was high enough to generate a hybrid mixture.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Fire and Explosion in Process Safety Prevention and Protection

ISSN

2571-6255

e-ISSN

2571-6255

Svazek periodika

8

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

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Kód UT WoS článku

001580883800001

EID výsledku v databázi Scopus

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