摘要：利用热重分析仪, 以水蒸气为气化剂, 考察Na₂CO₃、Fe(NO₃)₃及CaO₃种廉价催化剂及用量对碎焦水蒸气气化反应的影响, 同时探讨催化气化动力学。结果表明:添加催化剂后, 碎焦的气化温度降低约170℃, Na₂CO₃的催化活性最高, 随着Na₂CO₃负载量的增加 (钠离子负载量质量分数1%、3%、5%、10%) , 碎焦的气化速率提高, 5%左右的Na₂CO₃负载量达到饱和, 过量的催化剂不能有效提高碎焦的气化速率;Na₂CO₃添加使气化反应活化能降低35 kJ·mol-1, 从而提高反应速率;添加Na₂CO₃的碎焦气化反应, 收缩核模型可很好地反映碎焦气化的动力学规律。

关键词：冶金碎焦；催化气化；缩核模型

Abstract：The effect of 3 kinds of cheap catalysts,Na₂CO₃,Fe(NO₃)₃ and CaO,on the steam gasification reaction of metallurgical broken coke were investigate using the thermo-gravimetric analyzer and the steam as the gasifier.The catalytic gasification kinetics was discussed.The results show that the gasification temperature of the coke decreases about 170 ℃after the addition of the catalyst.The catalytic activity of Na₂CO₃ is the highest among the three catalysts.With the increase of Na₂CO₃ loading (sodium ion loading are 1%, 3%, 5% and 10%, mass fractions) ,the gasification rate of the cokes are improved, about 5% of the Na₂CO₃ loading reaches saturation,the excess catalyst can't effectively improve the gasification rate of coke.The addition of Na₂CO₃ effectively reduces the activation energy of the coke gasification reaction,thus increasing the reaction rate.Gasification of coke with added Na₂CO₃,the shrinking core model can well reflect the kinetics of coke gasification.

Keywords: metallurgical coke；thermo-gravimetric analyzer；catalytic gasification；shrinking core model