CO₂喷射参数与布局对瓦斯爆炸火焰抑制效果的影响

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中图分类号：TD712.7 文献标志码：A

Abstract：Current research on CO2 explosion suppression mainly focuses on parameters such as peak explosion pressre and flame propagation speed，while studieson changes in free radicals and turbulence distribution during CO2 suppression of methane explosions are relatively limited.This study systematically investigates theexplosion propagation characteristicsofmethane premixed gas within gas drainage pipelines and the suppression mechanism of CO2 under different injection pressures，nozzle layouts， and control sequences， throughacombinationoftheoreticalanalysis，experimentalresearch，andnumericalsimulation.Experiments were conducted using a self-built medium-scale explosion shock tube system，combined with flame sensors and spectroscopy techniques to capture flame characteristic parametersand typical evolution pattrns offreeradicals. A chemical kinetic model of methane explosion was developed based on CHEMKIN-PRO software to qualitativelyand quantitativelyanalyze the inhibitory effects of CO2 onkey free radicals.The results showed that when the nozzle flow rate was 6.38m3/s ，the maximum reduction in flame propagation speed reached 79.3% .The flame signal intensity showed a notable decrease，and the molar fraction of ·OH radicals decreased by 14.7% The local turbulence intensity peak （about 20% ）formed by high-pressure injection significantly improved CO2 difusion efficiencyand enhanced suppression effects.The dual-nozzle staggered inclined injectionstrategy achieved the best effect.By employing a spatiotemporal coupling design，it simultaneously controled both the injection quantityand timing of thesuppressant.Thisapproach establisheda triple barrierof "physical dilution-chemical inhibition-dynamic interception，" resulting in a 47.64% reduction in the molar fraction of ·OH radicals，significantly outperforming traditional single-nozzle and other dual-nozzle schemes.

Key words： gas explosion； flame propagation suppression; CO2 explosion suppression; CO2 injection pressure; turbulence intensity; nozzle layout; free radical concentration; spatiotemporal coupling design

0引言

煤矿瓦斯（主要成分为甲烷）爆炸事故严重威胁矿山安全[1-5]。（剩余11409字）