采用活化能分布模型解析渣油的热反应动力学参数  

DETERMINATION OF KINETIC PARAMETERS OF THERMAL REACTION FOR RESIDUES WITH ACTIVATION ENERGY DISTRIBUTION MODEL

作　　者：郭彦坤[1] 杨继涛[1] 苏君雅[1] 魏清泉[1] 

机构地区：[1]石油大学化工学院,北京102200

出　　处：《石油学报（石油加工）》2003年第5期69-73,共5页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：在热重装置上以线性升温方式进行了5种渣油的热反应。采用活化能分布模型解析了渣油的非等温热重曲线,求取了热反应活化能分布。结果表明,5种渣油活化能分布曲线的峰高、峰宽及峰的位置各不相同。辽河北常压渣油活化能分布的均值E_0远小于其它4种减压渣油,峰低而宽;其它4种减压渣油活化能分布的均值从小到大依次为孤岛减渣、大庆减渣、胜利减渣和也门减渣,说明4种渣油中键能高、难于断裂和热反应活化能高的组分数量依次增加。孤岛减压渣油的峰窄而高,也门减压渣油的峰宽且矮,显示出孤岛减渣中不同组分的热反应活性比较接近,而也门减渣中各组分的热反应活化能更为分散且活化能均值较高,组分之间的热反应活性相差较大。渣油热反应活化能确实具有一定的分布,分布曲线的形状和位置体现了渣油的热反应特性,亦反映了其在化学组成上的差异。Thermal reactions of five residues were carried out on a thermogravimetric unit, while the rate to heat the sample basket followed a linear temperature program until 500°C. The obtained thermogravimetric curves of the residues were processed with the activation energy distribution model, showing a Gaussian activation energy distribution. The distribution curve of each residue showed a concentrated peak of different heights and different widths. The mean values of the activation energy distribution increased gradually in the order of Gudao VR, Shengli VR, Daqing VR and Yemen VR. The mean value of activation energy distribution for North Liaohe AR was far less than (hat of the other four residues, and the peak shape was lower and wider. Thermal reaction of a residue can be characterized by the peak shape and the mean value of the distribution curve. The peak of the distribution curve of Gudao VR was narrower and higher (sharper), and that of Yemen VR was wider and lower, indicating that the activation energy values of thermal cracking for the components in Gudao VR were very close, i.e., these components showed closer reaction ability in thermal cracking; while for components in Yemen VR showed a dispersed distribution. The shape and the mean value of the distribution curve were also reflected the composition differences of the residues.

关 键 词：活化能分布模型 渣油 热反应 动力学参数 热重分析 

分 类 号：TE624.3[石油与天然气工程—油气加工工程]