苯热解渗透炭抑制焦炭劣化反应动力学  

Kinetics of inhibition reaction to coke deterioration by Benzene pyrolysis carbons

作　　者：张泽志[1,2] 王留成[1] 王福安[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001 [2]河南教育学院化学系,河南郑州450046

出　　处：《中南大学学报（自然科学版）》2013年第6期2583-2590,共8页Journal of Central South University:Science and Technology

基　　金：河南省重大公益性科研项目(08110911800)

摘　　要：进行苯热解渗透炭抑制焦炭劣化反应动力学实验,用未反应收缩核模型表征动力学实验数据,建立苯热解渗透炭抑制焦炭劣化反应动力学模型,确定模型参数。依所建动力学模型,计算出抑制焦炭劣化反应过程中的相对外扩散阻力ηg/∑η、相对内扩散阻力ηD/∑η和相对界面反应阻力ηC/∑η。研究结果表明:按Arrhenius方程得到苯热解渗透炭抑制焦炭劣化反应的活化能Ea=217.0 kJ/mol和有效扩散活化能ED=162.9 kJ/mol,均大于空白焦炭劣化反应的活化能Ea=142.0 kJ/mol和有效扩散活化能ED=96.30 kJ/mol;苯热解炭抑制焦炭劣化反应起始阶段主要受界面化学反应和外扩散影响,随着反应进行,劣化反应由内扩散、界面化学反应和外扩散同时影响;在较低温度下,焦炭劣化反应主要受界面化学反应控制,随反应温度升高,界面化学反应的相对阻力逐渐下降。The kinetics data of inhibition reaction to coke deterioration by benzene pyrolysis carbons were obtained to establish the models of the reaction and to determine model parameters using unreacted shrinking reaction core model. According to the kinetics models, the relative resistances of external diffusion ηg/∑η, the relative resistances of internal diffusion ηD/∑η, and the relative resistance of surface chemical reaction ηc/∑η, were calculated. The results show that based on Arrhenius equation, the activation energy Ea=217.0 kJ/mol and the effective diffusion activation energy ED=162.9 kJ/mol of the inhibition reaction of coke samples infiltrated by benzene pyrolysis carbons are both higher than those of the blank coke samples, Ea=142.0 kJ/mol and E0=96.30 kJ/mol, respectively. The inhibition reaction to deterioration is mainly affected by surface chemical reaction and external diffusion at the beginning of the reaction and then by internal diffusion, external diffusion and surface chemical reaction simultaneously. In addition, the inhibition reaction to deterioration is affected by the surface chemical reaction at the lower reaction temperatures, and then ηc/∑η decreases with the increase of the reaction temperatures.

关 键 词：焦炭 苯热解炭 抑制劣化反应 模型 动力学 

分 类 号：TQ520[化学工程—煤化学工程] TF526.1[冶金工程—钢铁冶金]