摘要
煤的耗氧速率是反映煤低温氧化能力的一个重要指标,也是预测煤最短自然发火期的重要参数之一。基于辅助热源恒热流加热方式搭建煤快速氧化实验台,快速模拟煤低温氧化升温过程,研究煤在快速氧化条件下的耗氧速率关联模型。根据所测定的煤快速氧化过程氧浓度变化,拟合出由单一活化能确定的耗氧速率计算模型;然后根据氧化速率的差异,使用双活化能分段确定出耗氧速率计算模型;最后基于煤氧复合机理,建立以恒热流方式加热的煤快速氧化升温数学模型。通过与所测煤温与氧浓度值的对比可知,基于单一活化能与双活化能分段描述的耗氧速率所获得的计算结果均表现出与煤快速氧化实验结果较好的一致性。
The oxygen consumption rate is an important index reflecting the oxidation capability of coal at low temperature and also an important parameter for predicting the shortest spontaneous combustion period of coal.In order to study arelative model of oxygen consumption rate at low temperature,atest rig to accelerate the coal oxidation using auxiliary heat source was established.According to the measured oxygen concentration,acalculating model for oxygen consumption rate determined by single activation energy was fitted.Then,the model was modified into segmental model by presuming dual activation energies for oxidation in different stages.The above two models were adopted into the thermo-fluid model to predict the increase of coal temperature,as well as the oxygen concentration.The results revealed that there was no meaningful difference between the results of the oxygen concentration rate calculated with single or dual activation energy models and the test results.
出处
《山东科技大学学报（自然科学版）》
CAS
2010年第5期67-72,共6页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家"十一五"科技支撑计划项目(2006BAK03B05)
关键词
耗氧速率
快速氧化
双活化能
数学模型
oxygen consumption rate
accelerated oxidation
dual activation energy
mathematical model
