基于孔树模型的煤低温氧化耗氧速率数学模型  

Mathematics Model for Oxygen Consumption Rate in Low-Temperature Oxidation of Coal Based on Pore Tree Model

作　　者：王兰云[1] 蒋曙光[1] 吴征艳[1] 何新建[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2008年第1期104-107,共4页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金(50674090;50534090);国家"十一五"科技攻关项目(2006BAK03B05)

摘　　要：为了考察煤的孔隙分布对煤低温氧化耗氧速率影响机理,利用孔树模型,建立了煤低温氧化耗氧速率的数学模型,得出煤氧化控制由扩散控制转化为动力控制的临界孔径rc(T),rc(T)随着温度升高呈线性增加趋势,表明温度升高,煤氧化逐渐由反应动力控制.该数学模型可确定不同孔分布煤的主要耗氧控制模式,反映耗氧速率与煤孔分布特征、温度的理论变化关系;当煤的有效孔隙率、孔径分布和微孔比已知时,还可用该数学模型对煤的耗氧速率进行预测.In order to investigate the affecting mechanism of pore distribution on oxygen consumption rate during low-temperature oxidation of coal, the mathematics model is built based on pore tree model. In the meanwhile, the critical pore radius re（T） is obtained, at which the oxidation of coal is transferred from gas diffusion control to kinematics reaction control and the re（T） has a linear increase with the rise of temperature T. The results show that the oxygen consumption is gradually controlled by kinematics reaction when temperature ascends. This model can determine the main control regime of oxygen consumption of coals with different pore distribution and reflect the relationship among oxygen consumption rate, temperature, and the pore distribution of different kinds of coals. When the effective porosity, pore radius distribution and micropore ratio are known, the oxygen consumption rate of coals of different ranks can be forecasted by this mathematical model.

关 键 词：孔树模型 耗氧速率 临界孔径 控制模式 

分 类 号：TD72[矿业工程—矿井通风与安全]