Numerical simulation of jet characteristics of preheating oxygen lance at different ambient temperatures
Aiming at the problems of low steelmaking efficiency,slow slagging and high splashing rate of 100 t converter oxygen lance in a steel plant in Xinjiang,the oxygen temperature at the inlet of oxygen lance nozzle was preheated to improve the dynamic performance of oxygen jet.Based on Fluent software,the influence of preheating temperature on the jet characteristics of five-hole oxygen lance at different ambient temperatures(300 and 1 873 K)was studied.The results show that the ambient temperature has a greater influence on the jet characteristics than the preheating temperature.As the ambient temperature increases,the jet independence becomes stronger,the velocity attenuation becomes slower,and the jet fusion distance and the length of the jet core area become larger.With the increase of preheating temperature,the velocity,turbulent kinetic energy and temperature of the jet increase,and the density and dynamic pressure decrease.For the five-hole oxygen lance of 100 t converter,the optimum smelting lance position is 2.5 m,the slag melting lance position is 3.0 m,and the optimum preheating temperature is 600 K.At the steelmaking temperature,the maximum effective impact areas at preheating temperatures of 300 and 600 K are 0.435 and 0.485 m2,respectively,and the maximum slag areas are 0.885 and 1.110 m2,respectively.The impact depths at 2.5 m smelting lance position are 0.361 and 0.244 m,respectively.Compared with 300 K without preheating,the optimal preheating temperature of 600 K increases the effective impact area by 11.49%,the slag area by 25.42%,and the impact depth by 32.41%,which can effectively reduce the risk of splashing and improve the smelting efficiency.
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