CO2驱动下NaHCO3对甲烷爆炸特性的影响
Effect of NaHCO3 on methane explosion characteristics driven by CO2
吴君安 1朱杭钦 1梁志星 1冯泓 1张苏1
作者信息
- 1. 福州大学环境与安全工程学院,福建 福州 350108
- 折叠
摘要
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 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.
关键词
甲烷爆炸/NaHCO3粉体/CO2驱动/抑爆效果/爆炸特性Key words
methane explosion/NaHCO3 powder/driven by CO2/explosion suppression effect/explosive characteristic引用本文复制引用
基金项目
福建省自然科学基金项目(2020J01505)
出版年
2024
国家科技期刊平台
NSTL
万方数据