Effect of NaHCO3 on methane explosion characteristics driven by CO2
To study the impact of NaHCO3 powder concentration on the explosion characteristics of meth-ane-air gas mixture driven by CO2,we conducted an explosion suppression test in a 1 m3 spherical explosion vessel.In this test,we used a methane-air gas mixture with an equivalent ratio of 1 and different concentra-tions of NaHCO3 powder to suppress methane explosion driven by CO2.By evaluating the maximum explo-sion pressure,maximum pressure rise rate,time to reach the maximum pressure,and flame speed,we ana-lyzed the explosion suppression effect of various NaHCO3 powder concentrations driven by CO2.The find-ings are as follows:under the current test dusting pressure,the jet gas creates turbulence disturbances,while the jet air enhances methane explosion;however,the jet CO2 exhibits a certain inhibitory effect,mak-ing it a more suitable driving gas;as the concentration of NaHCO3 powder increases,its inhibitory effect be-comes more pronounced;lower concentrations yield poor inhibition.For instance,the addition of 100 g/m3 NaHCO3 powder only reduces the maximum explosion pressure of methane by 18.7％.However,when the concentration surpasses 200 g/m3,the inhibition effect becomes evident;additionally,we conducted thermo-gravimetric analysis to explore the mechanism of methane explosion suppression by NaHCO3 powder driven by CO2.Both physical and chemical aspects are taken into consideration.
methane explosionNaHCO3 powderdriven by CO2explosion suppression effectexplosive characteristic
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