准东煤气化动力学模型研究

Study on Kinetic Models for Zhundong Coal Gasification

混合准东煤原煤与催化剂K2CO2、Ca（OH）2并制成煤样，在化学反应动力学控制条件下研究其气化反应特性，分析了煤样质量、CO2体积流量和颗粒直径对气化过程中内、外扩散阻力的影响，获得不同反应温度下均相模型、未反应芯收缩核模型和修正体积模型的拟合曲线，利用等转化率法计算气化反应活化能，并通过催化活性指数验证了该方法计算活化能的准确性．结果表明：在转化率为0．2、0．4、0．6和0．8时对应的活化能为100．1～130．2kJ／m01，3种模型计算所得活化能分别为128．97kJ／mol、140．33kJ／mol和139．43kJ／mol；均相模型为较合适的气化反应动力学模型．

Gasification characteristics of Zhundong coal mixed with catalyst K2C（）：~ and Ca（OH）2 respec- tively were studied in a chemical kinetic controlled regime, so as to analyze the effects of following factors on the internal and external diffusion resistance in the process of gasification, such as the amount of coal sample, the CO2 flow rate and the particle size, etc. , and to obtain the fitting curves of Zhundong coal gas- ification at different temperatures by the homogeneous model （HM）, unreacted shrinking core model （SCM） and modified volumetric model （MVM） separately, based on which the activation energy was cal culated using isoconversional method, while the accuracy of the method was verified with catalytic activity index. Results show that for conversion rates of 0.2, 0.4, 0.6 and 0.8, the corresponding activation ener- gy lies in 100. 1-130. 2 kJ/mol, and the results calculated by above three models are 128. 97 kJ/mol, 140.33 kJ/mol and 139.43 kJ/mol accordingly, proving HM to be the most appropriate kinetic model.