动力学控制下焦炭颗粒气化特性的模型研究  

Modeling the gasification characteristics of char particle under kinetics control

作　　者：周玮[1,2] 罗永浩[1] 吴国江[1] 邓剑[1] 

机构地区：[1]上海交通大学热能工程研究所,上海200240 [2]上海电气电站集团,上海201100

出　　处：《燃料化学学报》2009年第1期31-35,共5页Journal of Fuel Chemistry and Technology

基　　金：上海市科委重大攻关项目(05dz12002)

摘　　要：焦炭颗粒气化反应属于典型的非催化气固反应,固体结构会随着反应发生变化,颗粒的气化模型包含了体现固体颗粒表面积变化的结构因子。建立了具体的焦炭颗粒与二氧化碳气化过程的扩散-反应模型,并将研究的内容限定在动力学控制区域。该模型的特点在于其反应速率项采用了形式简单的结构因子,模型结果与随机孔模型对比后显示了很好的精确性。利用该模型考察了不同初始孔隙率的焦炭颗粒的转化率变化特性以及固定初始孔隙率下,气化温度和气化剂分压对焦炭颗粒气化的影响。Char particle gasification belongs to a classic noncatalytic gas-solid reaction. The soild structure would be changed with reaction, so a structural factor reflecting the surface area evolution of the soild particle was considered in the particle gasification model. The detailed diffusion-reaction model of a char particle gasification with carbon dioxide was developed, which is limited in the kinetics controlling region. A simple structural factor was adopted in the reaction rate term of the model. The modeling results show a good accuracy comparing with that of Random Pore Model. Moreover, the carbon conversion of a particle with a different initial porosity as well as the influence of gasification temperature and reactant partial pressure were investigated.

关 键 词：焦炭颗粒 气化模型 动力学控制 二氧化碳 气化特性 

分 类 号：TQ541[化学工程—煤化学工程]