薄板坯连铸结晶器热流分布研究

Study on heat flow distribution on the thin slab continuous casting mold

通过结晶器温度检测软件在线采集了武汉钢铁(集团)公司CSP结晶器铜板的温度,根据热电偶实测温度及连铸机冷却参数,计算了浇铸不同断面SPHC钢时不同拉速的热流值,并建立了结晶器热流的二维分布模型。结果表明,结晶器受水口射流影响,热流与温度在宽面横向分布很不均匀,表现出明显的双峰结构。相同工况条件下在铜板宽度方向上温度和热流密度分布具有相似性,距离弯月面越近,热流密度和温度的波动越大,弯月面处热流密度最大值达到4.6 MW/m2。

The temperature distribution on the CSP mould copper plate of Wuhan Iron Steel Corporation is measured with the mold temperature monitoring software. On the basis of the on-site measured temperature data by the thermal couple and the cooling parameters of the continuous caster the heat flux values of different drawing speed are calculated in casting steel SPHC with different sections and then a two-dimension mold heat flux distribution model is built. Results show that heat flux and temperature distribution in the width direction of the CSP mould are quite inhomogeneous, showing an obvious double peak pattern since they are affected by jet flow of submerged entry nozzle. Under the similar working conditions the distribution of copper plate temperature is similar to that of heat flux in the width direction. The nearer to the meniscus the more serious the fluctuation of the heat flux density and temperature becomes. The maximum heat flux density at the meniscus reaches approximately 4. 6 MW/m2.