科研之友
微信
新浪微博
Facebook
分享链接
摘要
Highly exothermic reactions require catalyst beds with good heat transfer characteristics. Novel Ni-foam structured catalysts have significant heat transfer efficiency compared with traditional packed beds, which is very suitable for the highly exothermic methanation reaction. The present work reports an experimental study of steady-state heat transfer behaviour of a gas flowing through a fixed bed packed with Ni-foam structured catalyst under various operation conditions. Experiments were carried out in a dedicated tubular reactor with inlet air temperature ranging from 160 to 200 degrees C, heating pipe temperature inside the fixed bed ranging from 400 to 500 degrees C, and air flow rate ranging from 4.0 to 6.0Nm(3)/h. Effective radial conductivity ((er)) and wall heat transfer coefficient ((w)) were derived based on the steady-state measurements and the two-dimensional pseudo-homogeneous heat transfer model. The estimated values of (er) and (w) were between 2.17 and 3.34W/m<bold>K and </bold>170 to 250W/m(2)<bold>K respectively</bold>. Heat transfer properties of Ni-foam structured catalyst are prominent compared with conventional packed bed. From the results it was found that the metal matrix and porous structure of the catalyst enhanced heat transfer. We anticipate that our research will open a new opportunity for design of new-generation SNG process.
