有序堆积填充床传热传质与反应耦合的数值研究  

Numerical study on heat and mass transfer characteristics coupled with chemical reaction of packed bed reactor with ordered stack

作　　者：杜娟[1] 魏小兰[1] 丁静[2] 陆建峰[2] 秦贯丰[3] 杨敏林[3] 杨晓西[1,3] 

机构地区：[1]华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640 [2]中山大学工学院,广东广州510006 [3]东莞理工学院广东省分布式能源系统重点实验室,广东东莞523808

出　　处：《中南大学学报（自然科学版）》2014年第2期629-637,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金重点资助项目(50930007);国家重点基础研究发展计划("973"计划)项目(2010CB227306);国家高技术研究发展计划("863"计划)项目(2012AA050604);广东省教育厅科技创新重点项目(cxzd1148)

摘　　要：采用CFD方法研究填充床反应器内CO2/CH4重整反应的热质传递与反应特性。首先考察3种不同N(N=dtube/dball)下填充床模型在无反应时的流动与传热特性,然后在耦合CO2/CH4重整反应后,比较有无耦合反应情况下的温度分布及N对反应转化率的影响。研究结果表明,本文模型与经验公式吻合较好,表明模型合理。无反应时,不同N对CO2/CH4重整反应的流动与传热特性有较大影响,管内传热速率及阻力系数随着N的增加而增加,管内阻力特性主要受填充床催化剂的形体阻力支配,当N=2时,填充床在研究的大多数雷诺数范围内具有最好的传热综合性能。耦合反应时,N对CO2/CH4重整反应的转化率也有较大影响,N=2.16时,甲烷转化率最大。N=1.67时,CO2/CH4在催化剂表面的反应转化率沿轴向随着温度的升高而增加。The heat and mass transfer and reaction characteristics in a packed bed with CO2/CH4 as the investigated reaction were studied by CFD approach. First, the fluid flow and heat transfer characteristics of three models with different parameter N, defined as N=dtube/dba11, were analyzed. Then, the influences of coupled reaction on the reaction conversion as well as N on temperature distribution were discussed. The results show that the predicted numerical result is reasonable in agreeing with those available in literatures. In the absence of reaction, the parameter N has an important effect on the flow and heat transfer characteristics of the packed bed reactor. The numerical result reveals that heat transfer rate and friction factor increase with the increase of N, and the flow resistance characteristic in the packed bed is governed by the form resistance of catalyst pellets. The case with N=2 has a better overall thermal performance in most of Reynolds number. In the presence of reaction, the present investigation shows that the parameter N plays an important role on the CH4 conversion. It is observed that the CH4 conversion is the largest when N=2.16 under investigated. At last, the mole fraction contours of different components when N=1.67 reveal that the reaction rate for CO2 reforming CH4 along streamwise direction increases as temperature increases.

关 键 词：CFD 填充床 有序堆积 CO2 CH4重整 

分 类 号：TG146.2[一般工业技术—材料科学与工程]