| The quality of ferric oxide, which is acquired by spray roasting technology, depends on the spray performance of the nozzle, the swirl nozzle is the key component in the acid regeneration system. In this paper, numerical simulation, theoretical analysis, and experimental investigation were to optimize the structure and operation parameters of the nozzle.Using the theories of fluid mechanics, the mechanism of flow in the swirl nozzle is analyzed, the internal velocity and pressure distribution of the nozzle are acquired. The flow inside and outside the swirl nozzle is simulated by Fluent software, and the experiments are done whit Phase Doppler Interferometer (PDI), the comparison between the results of numerical simulation and experiments shows that, the numerical simulation can truly reflect the variation of the spray performance parameters of the nozzle. With the simulation of the nozzle with different structure parameters(orifice diameter, orifice length, swirl chamber cone angle), the influences of the structure parameters of swirl nozzle on its spray performance were analysed. The results shows that the orifice diameter has the most significant influence on the spray performance. By means of dimensionless analysis, the relationship between spray cone angle, SMD and the structure characteristic parameters were given. The influences of the operation parameters of swirl nozzle on its spray performance were analysed with the simulation of the nozzle with different operation parameters, and the relationship between spray cone angle, SMD and the pressure was given. Eventually, the structure and operation parameters of the swirl nozzle was optimized, the ferric oxide acquired by this nozzle with high quality. |
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