不同氧浓度和温度下侏罗纪煤氧化动力学参数规律

(1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.内蒙古伊泰广联煤化有限责任公司,内蒙古 鄂尔多斯 017200)

煤的氧化; 氧气浓度; 耗氧速率; 活化能

Oxidation kinetic parameters of Jurassic coal under different oxygen concentrations and temperatures
ZHANG Xin-hai1,ZHANG Tian-ci1,WANG Yue2,FENG Zhen1,XING Er-jun1,ZHOU Shan-lin1

(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Inner Mongolia Yitai Guanglian Coal Chemical Co.,Ltd.,Ordos 017200,China)

safety science and engineering; coal oxidation; oxygen concentration; oxygen consumption rate; activation energy

DOI: 10.13800/j.cnki.xakjdxxb.2019.0402

备注

为了研究不同氧浓度和温度下侏罗纪煤的氧化动力学参数,在不同供氧条件下的基础上,通过程序升温氧化实验装置,应用化学反应动力学原理,计算出我国典型侏罗纪煤样的耗氧速率及氧化反应动力学参数。结果 表明,各煤样的表观活化能随温度及供氧浓度变化而变化。当供氧浓度一定时,各煤样氧化反应的表观活化能在30~60 ℃和大于70 ℃2个温度段内各不相同并呈分段性,前者大于后者。若供氧浓度变化时,当供氧浓度大于10%时,各煤样氧化反应的表观活化能都比较小,且随着供氧浓度的改变其变化较小; 供氧浓度在5%~10%时,各煤样氧化反应的表观活化能随供氧浓度的降低呈明显增加趋势,说明低氧条件下,煤的氧化过程发生了变化,从而进一步抑制了煤的氧化反应。

According to the temperature-programmed oxidation experiments of typical Jurassic coal samples in China under different oxygen supply conditions and chemical reaction dynamics principle,the oxygen consumption rate and the oxidation reaction kinetic parameters of each coal sample were calculated in order to study oxidation kinetic parameters of Jurassic coal under the conditions of different oxygen concentrations and temperatures.The results show that the apparent activation energy of each coal sample changes as temperature and oxygen supply concentration changes.At constant oxygen concentration,the apparent activation energy of oxidation reaction of each coal sample is different between the temperature ranges of 30 ℃ to 60 ℃ and above 70 ℃ and show piecewise characteristics with the former higher than the latter.When the oxygen supply concentration changes,the apparent activation energy of oxidation reaction of each coal sample is relatively low under the condition of oxygen supply concentration exceeding 10%,and changes in a very small range as oxygen supply concentration changes.The apparent activation energy of each coal sample increases as oxygen supply concentration decreases when the oxygen supply concentration is 5%~10%,indicating that the oxidation process of coal has changed under low-oxygen conditions,thereby further inhibiting the oxidation reaction of coal.