Direct reduced iron (DRI) shaft furnace flow field has important influence to the DRI production process, and the ventilation is a key factor for the velocity and pressure distribution of the gas flow in the furnace. At present works, the direct reducing gas velocity distribution and pressure distribution of DRI shaft furnace were studied with different ventilation. By the analysis of numerical simulation, the result was found that the direct reducing gas velocity increase with height in the shaft furnace reduction section. The velocity of the direct reducing gas augment with the increase of ventilation. The direct reducing gas pressure add with increasing height in the shaft furnace reduction section. With ventilation increasing, the pressure of the shaft furnace ventral part increase, and the pressure gradient increase in the direction of height in the DRI shaft furnace.
The fluid flow of Q235 molten steel in 700mm×700mm billet mold has been numerically simulated by a software FLUENT. By comparing the influence of submerged entry nozzle with different immersed depths, different number of holes and different opening angles on the distribution of fluid field, the structure of mold and the involved process parameters are optimized. With the application of the optimized structure and process parameters, the stability of fluid field is increased and the thickness uniformity of steel shell is improved, so that the quality of continuous casting billet is ameliorated, which provides a theoretical basis for engineering application.
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