我国动力煤TGA法表观活化能/指前因子分布规律

Distribution of apparent activation energy and apparent pre-exponential factor of Chinese power coals from TGA method

在调研57篇文献基础上对我国131种动力煤热重分析法(TGA)研究得到的表观活化能E、表观指前因子k0与我国动力煤的干燥无灰基挥发分含量Vdaf和燃料比FR的定量关系进行回归分析。结果表明:①随着Vdaf的提高,我国动力煤的E,lgk0线性降低,E=109.6-0.365Vdaf,lgk0=5.406-0.04Vdaf;同时,lgk0随着E线性提高,lg k0=-0.193+0.043E。据此,按照我国动力煤的常规参数Vdaf可以粗略计算E和k0,根据阿累尼乌斯定律进一步计算动力煤燃烧反应过程中的反应速率常数;②随着FR的提高,动力煤越来越难以燃烬,我国动力煤的E和lgk0总体上提高,E=90.891+3.097 37FR-0.138F2R,lg k0=3.413 2-0.001FR+0.022 8F2R。这两种关系与lg k0随E线性提高的关系相对应。

Based on 57 literatures, the quantitative relations among the apparent activation energy,E, apparent pre-ex- ponential factor, k0 and volatile content on dry ash free basis, Vdaf, fuel ratio （ FR ） data from TGA experiments were ob- tained for 131 Chinese power coal samples. Regression was made for lg k0 ,E with Vdaf,FR ,the regression results show that ① E, lg ko decrease linearly with Vdaf, E= 109.6-0. 365 Vdaf;lg ko = 5. 406-0.04Vdaf and lg ko increases linearly with E,lg k0 =-0. 193＋0. 043E. According to Vaaf of Chinese power coals,E and k0 can be calculated. In addition, ac- cording to Arrhenius Law, reaction speed constant number during power coal burning processes can be calculated. ② with the increase of FR ,E and lg k0 increase with FR generally,E=90. 891＋3. 097 37FR-0. 138F^2R ,lg ko =3. 413 2- 0. 001FR＋0. 022 8F^2R. The two mathematic relationships mentioned above correspond to the relationship of lg k0 in- creasing linearly with E.