低浓度瓦斯金属纤维燃烧技术与实验研究  

Low concentration gas metal fiber combustion technology and its experimental study

作　　者：张群 Zhang Qun(State Key Laboratory of Gas Disaster Monitoring and Emergency Technology,Chongqing 400037,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400039,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中国煤炭科工集团重庆研究院有限公司,重庆400039

出　　处：《煤化工》2024年第5期120-123,共4页Coal Chemical Industry

基　　金：国家自然科学基金面上项目(52174227);中煤科工集团重庆研究院有限公司创新引导项目(2021YBXM36);中煤科工集团重庆研究院有限公司重大科研项目(2022ZDXM10)。

摘　　要：为了减少煤矿低浓度瓦斯排放、降低大气污染,实现国家节能减排目标,开展了低浓度瓦斯金属纤维燃烧研究。分析了低浓度瓦斯采用金属纤维燃烧存在的优势;基于低浓度瓦斯易燃易爆特性、气体中含有灰尘和水分等因素,选择含有稀有金属钇的集束铁铬铝长纤维针织物制作低浓度瓦斯金属纤维燃烧器;进行了燃烧器的结构、热负荷及金属纤维辐射面积等设计;最后开展了燃烧实验。结果表明:低浓度瓦斯采用金属纤维燃烧器燃烧时,其甲烷体积分数下限为5.0%;金属纤维燃烧器的金属纤维织物内侧温度与燃烧强度呈负相关;金属纤维燃烧器的气流分布板内侧温度则随着燃烧强度增加呈现先升后降,在瓦斯甲烷体积分数为8.1%、燃烧强度为400 kW/m^(2)时,气流分布板内侧温度最高,达到248℃,远低于甲烷的热自燃温度,低浓度瓦斯采用金属纤维燃烧器燃烧不易发生回火。In order to reduce the emission of low concentration gas in coal mines,reduce the air pollution,and achieve the national goal of energy conservation and emission reduction,the study on the combustion of low concentration gas metal fiber was carried out.The advantages of metal fiber combustion for low concentration gas were analyzed.Based on the flammable and explosive characteristics of low concentration gas,dust and moisture contained in the gas and other factors,the bundled iron-chromium-aluminum long fiber knitted fabric containing rare metal yttrium was selected to make low concentration gas metal fiber burner.The burner structure,thermal load and metal fiber radiation area were designed.Finally,combustion experiments were carried out.The results showed that when low concentration gas was burned using a metal fiber burner,the lower limit of methane volume fraction was 5.0%.The temperature inside the metal fabric of the metal fiber burner was negatively correlated with the combustion intensity.The temperature inside the gas flow distribution plate of the metal fiber burner increased first and then decreased with the increase of combustion intensity.When the gas methane volume fraction was 8.1%and the combustion intensity was 400 kW/m^(2),the temperature inside the gas flow distribution plate was the highest,reaching 248℃,which was far lower than the thermal self-ignition temperature of methane.Therefore,it was unlikely to backfire when using metal fiber burner to burn low concentration gas.

关 键 词：低浓度瓦斯 金属纤维燃烧器 燃烧方式 甲烷体积分数下限 燃烧温度 回火 

分 类 号：TD712[矿业工程—矿井通风与安全] TQ343[化学工程—化纤工业] TK16[动力工程及工程热物理—热能工程]