煤绝热氧化动力学特征参数与变质程度的关系  

The relationship between oxidation kinetics characteristic parameters of coal adiabatic progress and metamorphic degree

作　　者：朱红青[1] 王海燕[1] 宋泽阳[1] 和超楠[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭学报》2014年第3期498-503,共6页Journal of China Coal Society

基　　金：国家自然科学基金煤炭联合基金重点资助项目(U1261214);国家自然科学基金资助项目(51074168)

摘　　要：为分析不同变质程度煤自然发火难易程度差异的氧化动力学原因,基于煤绝热氧化自热升温过程的基本假设,结合Arrhenius方程对该过程的反应特征进行了氧化动力学分析,然后研究得出绝热过程表观活化能(Ec)、绝热过程临界温度(Tc)和阶段内平均升温速率(Rhm和Rjs)4个特征参数,最后对各特征参数与煤质等级的关系进行数值拟合。结果表明:Ec,Tc,Rhm和Rjs四个特征参数,分别从煤自燃反应难易(Ec),控制难易(Tc)以及升温快慢(Rhm和Rjs)3方面表征其氧化动力学特征;随着煤的变质程度的升高,Ec与煤质等级成对数关系,Tc与其成线性关系,而Rhm和Rjs与之呈负指数关系。从氧化动力学角度对不同变质程度煤的自燃差异性进行分析,为自燃防治提供参考。To analyze the oxidation kinetics reason that self-ignition tendency of coal with different metamorphic degree are different, based on the basic assumptions of coal adiabatic self-heating process, a oxidation kinetics analysis on the reaction characteristics of the process was made combined with the Arrhenius equation, then this paper studied four feature parameters ： adiabatic process apparent activation energy （ Ec ）, the critical temperature （ Tc ） and the average heating rates each stages of the adiabatic process, （ Rhm, Rjs ）, finally, the relationship between each characteristic pa- rameter and coal metamorphic level was made by numerical fitting. It is show that the oxidation kinetics characteristics are characterized by the four parameters （ Ec, Tc, Rhm and Rjs ） in the difficulty degree of coal self-ignition reaction （Ec）, the difficulty degree of control （T）and the heating speed（ Rhm and Rjs ） ;with the increase of coal metamorphic grade, Ec has a logarithmic relation with it, Tc has a linear relation, however, Rhm and Rjs have a negative exponent rela- tion. The difference of self-ignition tendency of coal with different metamorphic degree is studied on oxidation kinetics, and it is of great significance to self-ignition control.

关 键 词：变质程度 氧化动力学 绝热过程 表观活化能 临界温度 阶段特性 

分 类 号：TD752[矿业工程—矿井通风与安全]