连铸钢坯二冷段喷嘴性能的实验研究

根据非稳态传热学原理,通过对大试样进行单侧加热,另一侧喷水的实验方法,对连铸二冷段喷嘴的热态性能进行了实验研究。根据实际生产条件,对不同喷水压力和不同喷水距离下,喷嘴传热系数关系进行了研究;实验结果表明:相同实验条件下,水喷嘴的传热系数高于气水喷嘴,而在均匀冷却方面,气水喷嘴更具有优势;无论哪一种喷嘴,随着喷水压力的增加,总体趋势传热系数都在增大,而随着喷水距离的增加,传热系数都在降低;同时,相同实验条件下,双喷嘴的冷却效果优于单喷嘴的冷却效果。

EXPERIMENTAL STUDY ON CHARACTERISTICS OF NOZZLE OF SLAB CONTINUOUS CASTING SECONDARY COOLING ZONE

According to the principle of non-steady-state heat transfer,and using experimental method of heating one side of the large specimens and spraying water on the other side,the hot property of the secondary cooling section of the nozzle of continuous casting was studied.Based on the actual production conditions,for different pressures and different water spray distance,the relationship between the nozzle heat transfer coefficient was also studied.Experimental results show that under the same experimental conditions,the water nozzle of the heat transfer coefficient is larger than that of air and water nozzles,and in the uniform cooling,air-water nozzle has more advantages;no matter what kind of nozzle,with the water pressure increases,the overall trend is in increasing heat transfer coefficient,and as spray distance increases,the heat transfer coefficients are reduced.Meanwhile,under the same experimental conditions,the effect of two-jet cooling is better than a single nozzle.