Dispersion characteristics of laterally injected fluid into main stream in packed bed

For the reduction of the carbon dioxide emission from the steelmaking industries, various approaches to design the blast furnace operation with the injection of the reducing gas to the stack part have been made. To realize this technology, the flow behavior of the injected gas has to be quantitatively understood. This study focused to clarify the mechanism to determine the flow path of the injected gas, and the flow behavior of the stream which is laterally injected to the main stream in the packed bed was discussed through theoretical consideration, experiments and numerical flow simulation. The injected stream flows along the wall of injection side without penetrating the main stream. The dispersion degree coincides with the flow rate ratio of injected stream to total flow under the condition with uniform packing structure and fluid properties. The dispersion degree in the region enough downstream from the injection is independent of the injection velocity and direction. The dispersion degree can be controlled in some extent by controlling the difference in the fluid properties between the main and the injected streams and the distribution of the packing structure.