Preconditioning of the dust and the fluid in the 20 L chamber during ignition by chemical ignitor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00007064%3AK02__%2F24%3AN0000089" target="_blank" >RIV/00007064:K02__/24:N0000089 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5281/zenodo.12515711" target="_blank" >http://dx.doi.org/10.5281/zenodo.12515711</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5281/zenodo.12515711" target="_blank" >10.5281/zenodo.12515711</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Preconditioning of the dust and the fluid in the 20 L chamber during ignition by chemical ignitor

Popis výsledku v původním jazyce

Dust explosion prevention and its consequences mitigation require measurement of dust explosion parameters. Testing methods are defined by European and American Standards producing results in explosion chambers of 1 m3 standard volume and alternatively 20 l. However, the results are influenced by some processes which are neglected by the Standards maybe because it is believed that their effect is small in 1 m3. But their effect became significant in smaller 20 l chamber. Preconditioning of the system caused by dust dispersion itself and ignitor´s flame is one of such problems. The aim of presented work is going deeper in physical and chemical processes caused by dust preheating after ignitor´s action. Analytical methods such as STA, GC/MS and FTIR analysed composition of the atmosphere after exposure of Lycopodium dust, as 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, organic compounds were measured. It seems that dust dispersed decomposes to mostly CO and CO2 in area near the ignitors even in an atmosphere where the oxygen concentration is lower than 2 % by vol. The concentrations of other organic compounds were very low including mostly methane, ethylene and acetaldehyde. The dispersed dust behaves as a heat sink which does not allow large dust modification in the whole dust cloud by the flame generated by ignitor´s action prior to dust flame arrival.

Název v anglickém jazyce

Preconditioning of the dust and the fluid in the 20 L chamber during ignition by chemical ignitor

Popis výsledku anglicky

Dust explosion prevention and its consequences mitigation require measurement of dust explosion parameters. Testing methods are defined by European and American Standards producing results in explosion chambers of 1 m3 standard volume and alternatively 20 l. However, the results are influenced by some processes which are neglected by the Standards maybe because it is believed that their effect is small in 1 m3. But their effect became significant in smaller 20 l chamber. Preconditioning of the system caused by dust dispersion itself and ignitor´s flame is one of such problems. The aim of presented work is going deeper in physical and chemical processes caused by dust preheating after ignitor´s action. Analytical methods such as STA, GC/MS and FTIR analysed composition of the atmosphere after exposure of Lycopodium dust, as 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, organic compounds were measured. It seems that dust dispersed decomposes to mostly CO and CO2 in area near the ignitors even in an atmosphere where the oxygen concentration is lower than 2 % by vol. The concentrations of other organic compounds were very low including mostly methane, ethylene and acetaldehyde. The dispersed dust behaves as a heat sink which does not allow large dust modification in the whole dust cloud by the flame generated by ignitor´s action prior to dust flame arrival.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

15th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions Naples, Italy | June 10 – 14, 2024

ISBN

—

ISSN

0570-4480

e-ISSN

2424-0656

Počet stran výsledku

13

Strana od-do

1226-1238

Název nakladatele

Zenodo

Místo vydání

Itálie

Místo konání akce

Neapol, Itálie

Datum konání akce

10. 6. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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