摘要
研究填充床中的气固反应aA(g)+bB(s)=cC(g)+dD(s).建立了反应气体A、产物气体C的对流反应扩散方程,并求出解析解.研究表明,颗粒半径对气体浓度和反应转化有着重要的影响,这种影响可以用Thiele数来估计;对流对反应气体和气体产物有不同的影响,但对流的本质不变.由于Thiele数与反应器长度的平方成正比,Peclet数与反应器长度的一次方成正比,因此反应器长度也是影响反应转化的重要因素;对气体浓度的分布,化学反应的作用比对流大.
The gas-solid reaction aA （g） ＋ bB （s） = cC（g） ＋dD （s） taking place in packed bed is studied. Convection-reaction-diffusion equations for gaseous reactant and gas product are presented and solved analytically. Case computation shows that the radius of pellet affects concentration of gases considerably, and the effect can be measured by Thiele module. Since Thiele module is proportional to L2 and Peclet module is proportional to L, the length of reactor itself is an important factor to affect the reaction and conversion. The overall rate of REV has greater influence on the reaction and conversion that take place in packed bed than that of convection. Therefore it is important to give the exact reaction term.
出处
《应用科学学报》
CAS
CSCD
北大核心
2006年第2期208-212,共5页
Journal of Applied Sciences
基金
国家自然科学基金重点项目(50136020)
教育部重点项目(01056)资助
