一些我国煤的裂解反应活化能统计分布模型研究

煤是一种很复杂的网状结构。据文献报道,煤中大致含有的基团是:芳核、氢化芳核、类似烷基链基团、烷基桥结构、含氧基团、含硫基团及含氮基团等。一般在700℃以前芳核中的键难于断裂,最易断裂的是与芳核联接的烷基链、脂肪链桥、氧桥及其它含氧化合物。这些键的断裂除与自身特性有关外,还与该键连接的邻接基团有关。因此煤的化学结构不同对煤的裂解有很大影响。而对煤裂解活化能的研究将有助于深入了解煤的裂解和燃烧过程。同时由于煤结构的复杂性,可以预期煤中键的断裂能量是连续分布,因而煤的裂解活化能也存在一个统计分布。据文献报道并结合我们的实验,对河北峰峰瘦煤和肥煤进行了研究,并得出了这两种煤活化能的统计分布模型。

THE STUDIES OF STATISTICAL DISTRIBUTIONS OF ACTIVATION ENERGIES FOR SOME COALS IN CHINA

Coal is a very complex system. If the thermal decomposition of the coal is assumed to consist of a large number of various chemical bonds, difference in the strengths of chemical bonds throughout the coal will cause marked differences in the temperatures at which the various bonds rupture. So the activation energy of coal can be viewed as a continuous distribution. This paper is concerned with the pyrolysis experiments of lean coal and fat coal from Feng-Feng, Heipei province, China.According to the pyrolysis results, the models of activation energies can be obtained for both coals and the most probable activation energies areL E_(lean)=268 kJ mol~(-1), E_(fat)=238 kJ mol~(-1).