高温陶瓷过滤器正向流动与过滤过程的数值计算

利用FLUENT计算流体力学软件,对高温陶瓷过滤器正向流动与过滤过程进行了数值计算,得到了切向进气和径向进气时高温陶瓷过滤器内的流场分布.结果表明:对于包含突变截面和多孔介质两类通道的复杂流动系统,合理地选择计算区域和分配网格后,应用FLUENT计算流体力学软件可以得到满意的计算结果;陶瓷过滤器的流动损失主要发生在陶瓷过滤管的多孔陶瓷介质内;当气体径向进入工作段时,对陶瓷管的冲击较大;当气体切向进入时,在工作段壁面附近的速度较大,对陶瓷管的冲击较小;切向进气时高温陶瓷过滤器的进出口压降小于径向进气时.从保护陶瓷管和减小压降两方面考虑,切向进气方式的高高温陶瓷过滤器优于径向进气方式的高温陶瓷过滤器.研究结果为选择高温陶瓷过滤器的进气方式提供了理论依据.

Numerical Calculation of Gas Flows in High Temperature Ceramic Filters

The numerical calculation of gas flow in high temperature ceramic filters was performed by using the FLUENT computational fluid dynamics software.The gas flow and pressure fields inside the tangential flow vessel and radial flow vessel were obtained.The result shows that the complicated flow system including sudden-changed cross-section and porous media, with suitable simulation of computational zones and generation of grid, can be resolved by FLUENT code satisfactorily.The flow loss in ceramic filters mainly occurs in the porous media,and decreasing of the flow loss in the porous media is the key to decreasing of the flow loss.When gas flows into the vessel radially, the impact of the gas flow to the ceramic filters is large.When gas flows into the vessel tangentially, the velocity near the vessel wall is large and the impact to the filers is small.The pressure drop is smaller in tangential flow vessel than in radial flow vessel.For protecting the filters and reducing pressure drop, the tangential flow vessel is more suitable than radial flow vessel.