石油焦CO_2气化动力学特性及建模

KINETICS CHARACTERISTICS AND MODELLING OF PETROLEUM COKE-CO_2 GASIFICATION

采用加压热天平考察了1248-1323 K、0.1-2.0 MPa下的石油焦CO2气化动力学特性。在此基础上提出了一个正态分布函数模型,很好地拟合了不同温度、压力下的石油焦CO2气化速率随转化率的变化规律。结果表明,石油焦CO2气化速率随着石油焦转化率的提高先增加后降低,呈单峰曲线,常压下在转化率为0.3左右出现最大值。最大气化速率对应的转化率随着温度的升高有降低的趋势。模型中的参数rm与温度的关系符合Arrhenius定律,由此求出0.1、1.0、2.0 MPa下石油焦CO2气化的活化能分别为197.7、233.4、218.2 kJ/mol,与文献数据相符。

Kinetics characteri 2. 0 MPa was studied shown decreas stics of petroleum coke by using a pressurized that the gasification rate of coke increased w gasification with C thermogravimetric ith the increase of 02 at 1248-1323 K analyzer （TGA）. It coke conversion and and was then ed after reaching its maximum. The conversion countered the max gasification rate was about 0.3 at 0.1 MPa and it had the decrease trend with the increase of temperature at all investigated pressure. A normal distribution function model was proposed to fit the kinetics data. The results showed that the model could describe well the relationship between gasification rate and conversion of coke at different temperature and pressure. The relationship between the parameter rm of the normal distribution function model and temperature obeys the Arrhenius law. Activation energies of coke - CO2 gasification under 0.1, 1.0, 2.0 MPa calculated from the Arrhenius law were 197.7, 233.4, 218.2 kJ/mol, respectively, which were in accordance with reported data.