Study on explosion characteristics of methane under effect of pressure relief intensity and concentration gradient

doi:10.16265/j.cnki.issn 1003-3033.2021.12.006

Abstract

Abstract: In order to study influence of pressure relief strength and concentration gradient on explosion characteristics of methane/air premixed gas, an experiment in a square flame propagation test pipeline system was carried out for premixed gas whose pressure relief strength was 30, 60 and 90 kPa and concentration gradient was 1%. The results show that as pressure relief intensity grows, the time for flame to pass through observation window increases gradually. And flame propagation presents a reciprocating oscillation phenomenon after rupture of pressure relief film. Due to existence of concentration gradient, measured temperature and pressure peak values inside pipes are significantly improved. When pressure relief intensity is low, vent burst pressure effects after film rupture dominates the changes in peak temperature and pressure which, however was dominated by excitation effect of concentration gradient on explosion reaction when pressure relief intensity increases.

Key words: pressure relief strength, concentration gradient, methane, explosion characteristics, premixed gas, explosion overpressure

CLC Number:

X932

CHEN Xianfeng, ZHI Xueke, LIU Lijuan, LEI Song, ZHANG Hongming, SUN Weikang. Study on explosion characteristics of methane under effect of pressure relief intensity and concentration gradient[J]. China Safety Science Journal, 2021, 31(12): 39-44.

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