Numerical simulation of flue gas circulation hood based on improved air inlet structure
Iron and steel industry has huge energy consumption in China,in order to solve the problems of high ener-gy consumption and large pollution emissions in the sintering process,the flue gas circulation system of 196 m2 sin-tering machine of a steel enterprise was studied,and a three-dimensional physical model was established,which was used as the entire calculation domain for simulation.The simulation found that under the existing production condi-tions,the incoming flue gas velocity was too high in the flue gas circulation hood without any diversion device,and the way it gathered at one point and then diffused outward would cause a large number of low-speed recirculation ar-eas in the hood,which was not conducive to the uniform distribution of flue gas.By improving the structure of the flue gas circulation hood,introducing the concept of submerged nozzle and organically combining it with the sintering flue gas circulation hood,the diversion and uniform distribution of flue gas can be achieved.The results show that,compared with the original flue gas circulation hood structure,after improving air inlet structure,the central flow deflection is reduced by 85％,and the maximum flow velocity entering the sintering material layer is 3.138 1 m/s;the velocity variance of the horizontal section for sintering material layer is 0.36,which is reduced by 84.1％com-pared with the original structure;the improved structure eliminates the problems of flue gas deflection and excessive material surface velocity,and the flue gas is evenly distributed in the flue gas circulation hood.The improved air in-let structure works synergistically with the sintering flue gas circulation hood,so that the flue gas and the material layer can interact more effectively,thereby obtaining higher sintering efficiency and less waste gas emissions.
sinteringstructural optimizationflue gas circulation hoodsubmerged entry nozzlenumerical simula-tion
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