以碳酸钠为催化剂,利用热天平研究了福建建欣高变质无烟煤常压下水蒸气气化反应动力学,在800～ 950℃测定了碳酸钠加载量从0～18％时该无烟煤气化反应特性,确定了实验条件下碳酸钠催化剂加载饱和浓度,结果表明,加载催化剂后建欣无烟煤气化反应活化能大幅降低.得到了建欣无烟煤与水蒸气气化反应动力学缩芯模型,并给出相应的动力学参数.分析表明,该催化气化反应体系活化能E与频率因子A0之间存在动力学补偿效应,得出其补偿效应方程为(I)n A0=8.66×10-5E- 0.2827,等动力学温度为1 389 K.%Using sodium carbonates as a catalyst, the steam gasification kinetics of Jianxin high metamorphosed anthracite was studied by isothermal thermo-gravimetric analysis under ambient pressure in this paper. The reaction activity of anthracite loaded with different sodium carbonate concentrations (0-18%) was investigated within the temperature range from 800-950℃.The loading saturation level of the sodium carbonate in catalysts under experimental conditions was determined. The catalytic steam gasification reaction could be well fitted by the shrinking-core model and the kinetic parameters were determined. Results show that sodium carbonate remarkably reduces the activation energy of gasification reaction. It is exhibited that compensation effect exists clearly in catalytic gasification kinetics in the kinetic analysis. The compensation effect is expressed by In A0 = 8.66 ×10-5E - 0.282 7, and the isokinetic temperature is 1 389 K.
展开▼
