Determination Method of Pressure Relief Area for Dust Explosion of Connected Equipment

doi:10.12068/j.issn.1005-3026.2024.02.016

Abstract

Abstract:

The relevant standards at home and abroad offer the calculation method for explosion venting area（EVA） of individual equipment，but there is a notable absence of guidelines for interconnected equipment. By means of FLACS numerical simulation，taking corn starch as the explosion medium，the reduced explosion pressure（REP） and rate of pressure rise in the connected equipment are simulated and explored. The results show that when the length of the pipe is fixed，the maximum REP in the booster vessel decreases with the increasement of the EVA. When the same EVA is set，the maximum REP in the booster vessel increases with the increase of the pipe length，and the time to reach the maximum REP value also delays. The minimum safe EVA required for the booster vessel is larger than that of the single equipment with same size， indicating that the calculation formula of the EVA of the single equipment is unreliable for the connected equipment. Through numerical fitting， the EVA calculation formula for single equipment in the standard was modified to meet the requirement of connected equipment. The research results provide reference for explosion-proof design for connected system.

Key words: connected equipment, dust explosion, numerical simulation, reduced explosion pressure（REP）, explosion venting area（EVA）

CLC Number:

X 932

Gang LI, Lei ZHOU, Xiao-yu ZHANG, Kai ZHANG. Determination Method of Pressure Relief Area for Dust Explosion of Connected Equipment[J]. Journal of Northeastern University(Natural Science), 2024, 45(2): 276-281.

Figures/Tables 8

Fig. 1 Flame release in the vessel at different time

Fig. 2 The pressure curves of the detonation vessel and the booster vessel

Fig. 3 Comparison of simulated and experimental values

Fig. 4 Pressure curves with time under different pipe lengths

Fig. 5 Variation curves of maximum relief pressure

Fig. 6 Curves of maximum explosion pressure rise

Table 1 Required minimum safe EVA for the booster vessel

管道长度/m	长径比	泄压面积/m²
2	10	0.24
4	20	0.26
6	30	0.31
8	40	0.32
10	50	0.32

Fig. 7 Fitting curve

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