摘要
为防治煤炭自燃,解决单一阻化剂作用时效短、防灭火效果差的问题。利用泡沫作为阻化剂的优良载体,基于CaCl_(2)的隔氧降温作用和褪黑素(MLT)的自由基捕捉作用,制备可持续高效抑制煤自燃的复合阻化泡沫。通过稳态剪切实验、泡沫性能对比实验确定最佳复合阻化泡沫配方,通过热释放特性实验、傅里叶红外光谱研究CaCl_(2)-MLT复合阻化泡沫(CM)对煤的阻燃性能及机理分析。结果表明,当LAB,AOS,CaCl_(2),MLT质量分数分别为0.56%、0.24%、16%、4%时,CM与水基泡沫相比具有更为紧密的多边形结构,泡沫体积半衰期高达3 067 min,是水基泡沫的6.89倍。与原煤相比,CM的第1个热释放峰值(HRR_(pk1))由80.18 kW/m^(2)降为41.60 kW/m^(2),平均有效燃烧热(av-EHC)降低6.44%,能有效抑制煤自燃。
To prevent coal spontaneous combustion,the problems of short action time and poor fire-fighting effect of a single chemical inhibitor are solved.Using foam as an excellent carrier of inhibitor,based on the oxygen isolating and cooling effect of CaCl_(2) and the free radical trapping effect of melatonin,the experimental research on the optimization of composite inhibitor foam was carried out.The optimal formulation of the composite retarded foam was determined by steady-state shear test and foam performance comparison test.The combustion characteristics and flame retardant mechanism of CaCl_(2)-MLT composite retarded foam were studied by thermal radiation combustion characteristic test and Fourier infrared spectroscopy.The results show that when the mass fraction of LAB,AOS,CaCl_(2) and MLT is 0.56%,0.24%,16%and 4%respectively,CM has a more compact polygon structure than water-based foam,and the volume half-life of foam is up to 3067 min,6.89 times that of water-based foam.Compared with raw coal,the first heat release peak(HRR_(pk1))of CM decreased from 80.18 kW/m^(2) to 41.60 kW/m^(2),and the average effective combustion heat(av-EHC)decreased by 6.44%,which can effectively inhibit coal spontaneous combustion.
作者
王子寒
李佳怡
韩超
WANG Zihan;LI Jiayi;HAN Chao(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China)
出处
《煤炭技术》
CAS
北大核心
2023年第5期149-153,共5页
Coal Technology
关键词
煤炭自燃
氯化钙
褪黑素
复合阻化泡沫
阻燃特性
coal spontaneous combustion
CaCl_(2)
melatonin
composite inhibitor foam
flame retardancy
