The objective of this study is to characterize the three-dimensional fluid flow in the vessel containing one ceramic candle filter. The three-dimensional governing equations are formulated in this study and the turbul...The objective of this study is to characterize the three-dimensional fluid flow in the vessel containing one ceramic candle filter. The three-dimensional governing equations are formulated in this study and the turbulent k - ε model is adopted for the numerical computation. It is found that the viscous force is dominant in the porous region with compared to inertia force. Pressure decreases linearly when the flow passing through the porous medium. When the face velocity is 0.03 m/s, the pressure drop is about 350 Pa. It has also been found that the fluid with the spiral motion to be sunk into the filter in the vessel.展开更多
Integrated gasification combined cycle (IGCC) is one of the candidates to achieve stringent environmental regulation among the clean coal technologies. Advancing the technology of the hot gas cleanupsystems is the mos...Integrated gasification combined cycle (IGCC) is one of the candidates to achieve stringent environmental regulation among the clean coal technologies. Advancing the technology of the hot gas cleanupsystems is the most critical component in the development of the IGCC. Thus the aim of this study isto understand the flow field in the ceramic filter and the influence of ceramic filter in removal of theparticles contained in the hot gas flow. The numerical model based on the Reynolds stress turbulencemodel with the Darcy’s law in the porous region is adopted. It is found that the effect of the porosityin the flowfield is negligibly small while the effect of the filter length is significant. It is also found asthe permeability decreases, the reattachment point due to the flow separation moves upstream. Thisis because the fluid is sucked into the filter region due to the pressure drop before the flow separationoccurs. The particle follows well with the fluid stream and the particle is directly sucked into the filterdue to the pressure drop even in the flow separation region.展开更多
文摘The objective of this study is to characterize the three-dimensional fluid flow in the vessel containing one ceramic candle filter. The three-dimensional governing equations are formulated in this study and the turbulent k - ε model is adopted for the numerical computation. It is found that the viscous force is dominant in the porous region with compared to inertia force. Pressure decreases linearly when the flow passing through the porous medium. When the face velocity is 0.03 m/s, the pressure drop is about 350 Pa. It has also been found that the fluid with the spiral motion to be sunk into the filter in the vessel.
文摘Integrated gasification combined cycle (IGCC) is one of the candidates to achieve stringent environmental regulation among the clean coal technologies. Advancing the technology of the hot gas cleanupsystems is the most critical component in the development of the IGCC. Thus the aim of this study isto understand the flow field in the ceramic filter and the influence of ceramic filter in removal of theparticles contained in the hot gas flow. The numerical model based on the Reynolds stress turbulencemodel with the Darcy’s law in the porous region is adopted. It is found that the effect of the porosityin the flowfield is negligibly small while the effect of the filter length is significant. It is also found asthe permeability decreases, the reattachment point due to the flow separation moves upstream. Thisis because the fluid is sucked into the filter region due to the pressure drop before the flow separationoccurs. The particle follows well with the fluid stream and the particle is directly sucked into the filterdue to the pressure drop even in the flow separation region.
