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为了研究在CO2气体驱动下NaHCO3粉体浓度对甲烷-空气混合气体爆炸特性的影响，在1 m3球形爆炸容器内，以当量比为1的甲烷-空气混合气体为抑爆对象，开展了CO2驱动下不同浓度NaHCO3粉体抑制甲烷爆炸试验，并结合最大爆炸压力、最大升压速率、到达最大爆炸压力的时间和爆炸火焰传播速度分析了CO2驱动下不同浓度NaHCO3粉体的抑爆效果。结果表明：在当前试验喷粉压力下，由于喷射气体会产生湍流扰动，喷射空气会增强甲烷爆炸，而喷射CO2对甲烷爆炸具有一定的抑制作用，更适合做驱动气体；随着NaHCO3粉体浓度的增加，NaHCO3的抑爆效果增强，当NaHCO3粉体浓度较低时，抑爆效果较差，其中添加100 g/m3 NaHCO3粉体仅使甲烷最大爆炸压力下降18.7%,而当NaHCO3粉体浓度超过200 g/m3时表现出明显的抑爆作用；基于热重分析结果，从物理和化学两个方面分析了CO2驱动下NaHCO3粉体抑制甲烷爆炸的机理。
Abstract：To study the impact of NaHCO3 powder concentration on the explosion characteristics of methane-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 concentrations of NaHCO3 powder to suppress methane explosion driven by CO2.By evaluating the maximum explosion pressure, maximum pressure rise rate, time to reach the maximum pressure, and flame speed, we analyzed the explosion suppression effect of various NaHCO3 powder concentrations driven by CO2.The findings 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, making it a more suitable driving gas; as the concentration of NaHCO3 powder increases, its inhibitory effect becomes 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 thermogravimetric analysis to explore the mechanism of methane explosion suppression by NaHCO3 powder driven by CO2.Both physical and chemical aspects are taken into consideration.
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基本信息:
DOI：10.13578/j.cnki.issn.1671-1556.20221673
中图分类号:X932
引用信息:
[1]吴君安,朱杭钦,梁志星等.CO_2驱动下NaHCO_3对甲烷爆炸特性的影响[J].安全与环境工程,2024,31(04):37-44.DOI:10.13578/j.cnki.issn.1671-1556.20221673.
基金信息:
福建省自然科学基金项目(2020J01505)