Investigations on different distribution systems for dusts inside the 20L-sphere

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F24%3A39921906" target="_blank" >RIV/00216275:25310/24:39921906 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/abs/pii/S095042302400250X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S095042302400250X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jlp.2024.105492" target="_blank" >10.1016/j.jlp.2024.105492</a>

Result language

angličtina

Original language name

Investigations on different distribution systems for dusts inside the 20L-sphere

Original language description

The determination of several safety characteristics for dusts requires the dispersion of it in air. This is normally conducted using two vessels, one with an overpressure holding the dust and dispersing it into the second one, where the explosion takes place, through a nozzle. This procedure has the disadvantage that some dusts cannot be conveyed through the nozzle properly. Another disadvantage is that the pressure balancing between the two vessels depends on the dust loading and especially for heavy dusts and high loadings the initial pressure inside the explosion vessel might be reduced. Flocky dusts or dusts that might be dangerous to convey through a thin nozzle with an overpressure (nanopowders, zirconium) are also difficult to test according to the extisting standards andmay not be tested with the standard nozzles, that are so far used for the determination of safety characteristics. One very recent example, testing nitrocellulose, raised the question, whether some dusts even pose a risk being distributed and pressed through a nozzle for the testing device and, in worst case, for the operator. Previous researchers have developed alternative types of nozzles for specific types of dust, but provide limited evaluation of their performance relative to standard nozzles. Additionally researchers have not provided sufficient geometry so that they can be reproduced by others. One alternative nozzle for the dispersion of flocky or coarse dusts is stated in the ISO standard but not described there either. This article investigates four types of nozzles: The two standard ones that are widely used already, an alternative type, that got introduced into the international standard in 2016 but is still seldomly used and one that was constructed to overcome some of the observed disadvantages. The injection curves are compared with and without dust loadings as well as the explosion characteristics. Eventually, a suggestion is given for different types of dusts.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20400 - Chemical engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Journal of Loss Prevention in the Process Industries

ISSN

0950-4230

e-ISSN

1873-3352

Volume of the periodical

92

Issue of the periodical within the volume

December 2024

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

105492

UT code for WoS article

001359551400001

EID of the result in the Scopus database

2-s2.0-85209145087