Numerical Simulation Of Sen Influence In Mold Flow And Temperature Fields

With the development of efficient continuous casting technology, the metallurgical faction of mold become more important. Mold flow behavior of molten steel is not only involve inclusions removal and flux entangle, but also uniform the initial solidified shell and prevent partial erosion caused by injection flow to even shell leakage or bloom surface crack has a significant impact. So in-depth studies of the flow behavior of liquid steel in mold is the key to improve the quality of the bloom.In this paper, based on computational fluid dynamics theory of three-dimensional mathematical model, Baotou steel plant bloom mold (section scale 380mm×280mm) was studied, by commercial software Fluent. The influence ofSEN"s parameters (the depth of nozzle immersion, nozzle outlet angle, casting speed) on flow field, temperature distribution and the inclusion movement in the mold were studies respectively.The research show that:The depth of SEN immersion influence the impact point position mainly. With the insertion depth increased, jet impact positions become from 0.13m to 0.19m and 0.24m. The impact velocity decreases slightly on the narrow side of mold, followed by 0.28m / s, 0.25 m / s, 0.23m / s.Liquid surface gradual smooth, high temperature zone down. Inclusions removal rate lower ,such as: The removal rate of 100μm inclusion decreased from 20% to 18%.And removal rate of 200μm inclusion decreased from 40% to 30% and so on.Casting speed affects the entire flow pattern of liquid steel in the mold mainly. As the casting speed increased, the nozzle exit velocity increased, from 0.7m / s to 0.9m / s and 1.2m / s .The impact velocity on the narrow side of the mold increased up to 0.17m / s, 0.23m / s and 0.25m / s. Penetration depth increased increase slightlys and the mold level become more fluctuated, removal rate of inclusions become lower, such as:the removal rate of 100μm inclusion decreased from 20% to 17%; and 200μm inclusion removal rate material decreased from 40% to 25% and so on. the hole inclination mainly affected the outlet side angle and range jet. With the nozzle dowards angle increased the jet impact on the narrow side of the depth increased, by 0.13m, 0.17m, 0.19m. Impact strength decreased from 0.42m / s to 0.31m / s and 0.25m / s. Then the temperature of the lower part of the mold increased, inclusions removal rate become lower, such as: 100μm inclusion removal rate decreased from 23% to 17%; and 200μm inclusion removal from 42% to 30%, etc..By studying, when the nozzle insertion depth is 100mm, casting speed is 0.7m/min, dip angle down to15°, the mold flow and temperature field distribution are more reasonable. This design has been running live in production. The quality of blooms is good and inclusion content meets the high-speed railway steel cleanliness requirements.