摘要
为了研究经过初次氧化后,煤在不同温度阶段的自燃特性变化规律,采用程序升温实验,对4组煤样（原煤样和3组预氧化煤样）从40～180℃的氧化过程进行测试,计算、分析煤样的耗氧速度以及活化能,找出煤样的耗氧速度以及活化能在整个升温过程中的突变点,据此划分出3个阶段,得出煤二次氧化过程中不同温度阶段的自燃特性.结果表明：任何一个阶段经过预氧化后的煤样的耗氧速度的变化率均大于原煤样,在第2和第3阶段预氧化后的煤样的活化能均小于原煤样,耗氧速度变化率的变化规律与活化能的变化规律在所对应的阶段是相一致的.无论从耗氧速度的变化率去分析还是从活化能角度分析都可以得出在第2和第3阶段中自燃倾向性最大的分别为预氧化120和90℃的煤样.
In order to study the characteristics of spontaneous combustion of pre-oxidized coal at different temperature,4 samples（ fresh coal,and three pre-oxidized coal samples） were adopted to investigate the oxidation process from 40～180℃ by the temperature programmed test device. The rate of oxygen consumption and the activation energy during coal spontaneous combustion were calculated,and the mutation temperature for the rate of oxygen consumption and the activation energy of coal was obtained. Based on the mutation temperature,the whole process was divided into three stages. Then, the characteristics of spontaneous combustion of pre-oxidized coal were achieved at different temperatures. The results indicated that the change rate of oxygen consumption rate for pre-oxidized coal on any stage is higher than that of raw coal sample. The activation energies of the pre-oxidized coal on the second and third stages are less than that of the raw coal. The change law of rate of oxygen consumption rate is consistent with the change of the activation energy. Focusing on either the change rate of oxygen consumption rate or the activation energy,the coal pre-oxidized at 120 and 90℃ have a higher risk of combustion on the second and third stages,respectively.
作者
任帅京
肖旸
赵帅
吕慧菲
黄传亮
Ren Shuaijing1, Xiao Yang1,2 , Zhao Shuai1 , Lyu Huifei1 , Huang Chuanliang1(1. School of Safety Science and Engineering, Xi＇ an University of Science and Technology, Xi＇ an 710054, China; 2. Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, Xi＇an 710054, China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2018年第3期16-21,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(51204136)
中国博士后科学基金资助项目(2016M590963)
陕西省工业科技攻关项目资助(2016GY-192)
关键词
二次氧化
耗氧速度
活化能
secondary oxidation
oxygen consumption rate
activation energy
