摘要
煤的氧化放热是影响煤自燃的主要因素之一,为研究不同粒径下煤粉的低温氧化特性,采用差示扫描量热法(DSC),测量不同粒径下煤的低温氧化热流。结果表明,煤低温氧化过程具有明显的阶段性特征。低温下煤的氧化可以分为3个阶段,包括脱水阶段、缓慢氧化阶段和加速氧化阶段。煤氧化过程的热演化特征是先吸热再放热,较小的粒径促进了煤氧化放热。并且随着粒径减小,活化能呈现降低的趋势。因此,粒径的减小导致煤自燃趋势增加。
The heat release of coal oxidation is one of the key factors affecting the coal spontaneous combustion.To investigate the low-temperature oxidation characteristics of pulverized coal under different particle sizes,differential scanning calorimetry(DSC)was used to measure the low-temperature oxidation heat flow of coal.The results show that the low-temperature oxidation process of coal has obvious stage characteristics.The oxidation of coal at low temperature can be divided into three stages,including dehydration stage,slow oxidation stage and accelerated oxidation stage.The thermal evolution of coal oxidation process is characterized by first endothermic and then exothermic.The smaller particle size promotes the exothermic oxidation of coal,and as the particle size decreases,the activation energy shows a decreasing trend.Therefore,the reduction of particle size leads to the increase of spontaneous combustion of coal.
作者
何瑾瑶
单泽
奚志林
HE Jin-yao;SHAN Ze;XI Zhi-lin(School of Environment Science and Safety Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《煤炭技术》
CAS
北大核心
2021年第7期189-193,共5页
Coal Technology
基金
国家自然科学基金面上项目(52074192)
天津市重大专项(18ZX AQSF00020)
天津市一般项目(19JCYBJC23000)
国家级大学生创新创业训练计划项目(201910060015)。
关键词
煤自燃
不同粒径
低温氧化特性
差示扫描量热法
阶段特征
活化能
coal spontaneous combustion
different particle sizes
low-temperature oxidation characteristics
differential scanning calorimetry
stage characteristics
activation energy
