【摘要】 以硼酸、硼砂、硅酸铝黏土按不同比例(纯硼酸,1∶0∶1,3∶2∶5,2∶1∶7,0∶1∶1,纯硼砂)混合作为钝化剂。研究用不同配比钝化剂钝化后的焦炭与CO2的反应动力学,利用未反应核收缩模型建立相应的动力学关系式,获得不同配比钝化剂钝化后的焦炭与CO2反应的相关动力学参数,并对这些参数以及反应过程中各步骤阻力进行分析。结果表明:钝化焦炭反应符合未反应核收缩模型,钝化剂的作用效果主要体现在内扩散步骤,并且不同钝化剂配比的效果依次为纯硼酸>2∶1∶7>1∶0∶1>3∶2∶5>0∶1∶1>纯硼砂>空白;钝化焦炭反应在开始阶段受界面化学反应和内扩散联合控制,反应一段时间后主要受内扩散控制。更多还原

【Abstract】 Passivators for coke were made of boric acid,borax and aluminium silicate clay in different proportions(boricacid,1∶0∶1,3∶2∶5,2∶1∶7,0∶1∶1,borax).The kinetics of the reaction between passivated-coke and CO2 was studied by using the shrinking unreacted core model,and a relational expression of reaction kinetics was established.The kinetics parameters of the reaction between coke passivated by using different proportion passivators and CO2 were calculated by the relational expression.The kinetics parameters and resistance in various steps of the reaction process were analyzed.The results show that reaction of passivated-coke with CO2 is consonant with the shrinking unreacted core model.The order of the effects of different passivation on the passivated-coke reaction with CO2 is boricacid >2∶1∶7 >1∶0∶1> 3∶2∶5>0∶1∶1> borax >blank and the effect is mainly reflected in the internal diffusion.The passivated-coke reaction with CO2 is controlled by a combination of chemical reaction and internal diffusion in the initial stage.After a period of time,the reaction is mainly controlled by the internal diffusion.更多还原