不同温度提质褐煤在水分复吸后的自燃特性变化  

Spontaneous combustion characteristics of lignite upgraded at different temperature after undergoing moisture re-adsorption

作　　者：刘丽华[1,2] 初茉[1] 党彤彤 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]河南城建学院材料与化工工程学院,河南平顶山467000

出　　处：《煤炭工程》2016年第10期131-134,共4页Coal Engineering

基　　金：国家自然科学基金资助项目(U1261101);国家重点基础研究发展规划资助项目(973计划;2014CB744301)

摘　　要：基于雨雪天气后低阶煤焦自燃高发的现象,采用固定床管式炉在105~800℃范围内对褐煤提质,提质新鲜样（SA）及其水分复吸样（SC）分别在程序升温装置中进行自燃测定,分析自燃特性变化。结果显示,水分复吸使SC的临界温度吸氧量比SA降低60%以上。与SA不同,SC的吸氧量在低温氧化阶段很小且存在波动,在加速氧化阶段产生短暂＂平台＂期。SC在加速氧化阶段的瞬时升温速率（θ）比SA增加更快,自热温升加速。FCC指标显示,200~400℃提质的SC,自燃倾向性比SA显著增加,与SA-105接近,即高湿度环境储存会抵消提质降低褐煤自燃倾向性的效果。In order to analyze the difference of spontaneous combustion characteristics between the fresh samples upgraded（ SA） from 105℃ to 800℃ in fixed bed reactor and their samples suffering moisture re-adsorption（ SC）,the oxygen adsorbed and heating rate is obtained through oxidation test of temperature programming. The results show that the absorbed oxygen at critical temperature for SC reduced exceeding 60% comparing with SA. But catalytic action of water resulted in that the increase for instantaneous heating rate of SC is quicker than SA at the acceleraed oxidation stage,which means the self-heating for SC is faster. Based on assessment of FCC,the spontaneous combustion liability for SC upgraded at 200 ~400℃ went distinctly beyond SA. So storing at high moisture environment could counteract the effect that upgrading reduced the spontaneous combustion liability for lignite.

关 键 词：热提质 自燃特性 水分复吸 交叉点温度 吸氧量 升温速率 

分 类 号：TQ534[化学工程—煤化学工程]