Evaluation of the Explosion Pressure Parameters in Flameproof Enclosures under the Pressure Piling Condition

Dong Li, Shijie Dai and Tao Lin
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Dong Li: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
Shijie Dai: School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
Tao Lin: School of Artificial Intelligence, Hebei University of Technology, Tianjin 300401, China

Energies, 2021, vol. 14, issue 23, 1-13

Abstract: Explosion resistance is one of the most important performances for all flameproof enclosures. Pressure piling requires the flameproof enclosures to withstand explosion pressure higher than the design pressure. In order to study the explosion parameters in a flameproof enclosure under pressure piling, two experimental setups were prepared based on the theoretical analysis of the mechanism of pressure piling. One setup simulated the condition that the interior of a flameproof box is isolated by a baffle with a small hole. Another setup simulated the condition that a large number of electrical components were installed inside an explosion-proof box. The experimental result showed that the explosion pressure increased significantly in a very short time under pressure piling. When an explosion occurred in a cavity, the pressure wave of the explosion propagated faster than the flame propagation, and the pressure wave was transmitted to another cavity through a gas channel between the two cavities. This resulted in the pre-pressurization of the combustible gas in another cavity. It was observed that the ignition time in the cavity with an ignition source, is the key factor for pressure piling.

Keywords: explosion resistance; pressure piling; gas channel (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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