Abstract

To assess the hazardous impact of liquefied petroleum gas (LPG), this study investigated its macro–micro deflagration characteristics under various compositions and equivalence ratios using a 20 L spherical experimental apparatus and CHEMKIN-Pro kinetic software. The findings are as follows: when the equivalence ratio was 1.2, the LPG exhibited peak values for the maximum explosion pressure (pmax), maximum explosion pressure rise rate ((dp/dt)max), deflagration index (KG), and average flame propagation velocity (v). Furthermore, the (dp/dt)max, KG, and v increased with increasing the proportion of C3H8. In the LPG chain reaction, the most influential steps in terms of promotion and inhibition were R1: H + O2 = O + OH and R104: 2CH3(+M) = C2H6(+M), respectively. C2H4 gradually accumulated during the chain initiation phase and rapidly depleted as the temperature sharply increased. Hence, to effectively inhibit LPG explosion, it is recommended to develop inhibitors capable of eliminating reactive radicals (such as H*, O*, and OH*) and targeted inhibitors that specifically inhibit the reaction involving C2H4. Additionally, augmenting the C3H8 proportion in LPG can mitigate the emission of toxic and harmful gases, such as CO and CO2. This study has significant theoretical and practical implications for the safe, environmentally friendly, and efficient use of LPG.

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