摘要
为了研究纳米粉体的抑爆作用,采用自主改进容积为20 L的近球形抑爆试验系统,测试添加SiO2纳米粉体时的瓦斯爆炸极限、压力等特性参数的变化,并同微米级粉体对比分析其抑爆效果,同时研究粉体质量浓度和点火时间对抑爆效果的影响。试验结果表明:同微米级粉体相比,纳米粉体的抑爆效果更好;质量浓度为0.1 g/L、粒径为50 nm的SiO2粉体可使瓦斯与空气混合气体(瓦斯体积分数7%)的爆炸压力下降约70%,压力上升平均速率下降约90%,爆炸极限范围缩小约43%;超细粉体抑爆剂在固定空间内存在最佳抑爆浓度范围,并不是粉体添加量越大抑爆效果越好;粉体抑爆剂喷洒形成固体微粒气溶胶后存在最佳抑爆时间范围,超出该时间范围抑爆作用衰减明显。
In order to study the explosion restrained role of the nanometer powder,with the self improved volume 20 L like ball mode explosion restrained test system,the variation of the gas explosion limit,pressure and feature parameters were measured when the SiO2 nanometer powder added.The paper also had a comparison analysis of the explosion restrained effect with the micro powder.The paper had a study on the power density and the ignition time affected to the gas explosion restrained effect.The results showed that in comparison with the micro powder,the explosion effect of the nanometer powder would be better.The SiO2 powder with the mass density of 0.10 g/L and the particle of 50 nm could make the explosion pressure of the methane and air mixed gas（with the methane volume fraction of 7%） decreased by 70%,could make the average rate of pressure rising decreased by 90% and could make the explosion limit scope decreased about 43%.The ultra fine powder restrainer of the explosion would have the optimum explosion restrained density scope in the fixed space and more powder added did not mean the explosion effect will be better.The solid micro particles air dissolved glue formed by spraying the powder explosion restrainer would have the optimum explosion restrained time limit and beyond the time limit,the explosion restrained role would be obviously reduced.
出处
《煤炭科学技术》
CAS
北大核心
2010年第8期73-76,共4页
Coal Science and Technology
基金
国家自然科学基金资助项目(50874088
50904049)
教育部创新团队资助项目(IRT0856)
陕西省教育厅专项科研计划资助项目(08JK351)
关键词
瓦斯爆炸
SiO2纳米粉体
粉体浓度
粒径
抑爆剂
爆炸极限
gas explosion
SiO2 nanometer powder
powder density
particle size
explosion restrainer
explosion limit
