宝钢厚板连铸机结晶器凝固传热模型的研究和开发

Research and Development of Solidification and Heat Transfer Models for Mould of Baosteel's Heavy-plate Continuous Caster

以宝钢厚板连铸机结晶器一冷传热过程为研究对象,结合高温铸坯在结晶器内的实际热量传输规律,建立了宝钢厚板连铸机结晶器凝固和传热模型。结晶器内凝固传热过程分为凝固坯壳传热、缝隙间传热和结晶器铜板传热,其中结晶器缝隙间传热模型综合考虑了气隙、保护渣和振痕对传热的影响。利用Fortran语言对模型进行编程,开发出相应的结晶器凝固和传热仿真软件Moheat。结合厚板连铸机结晶器生产数据,对模型进行了验证,所得计算结果符合实际测量值。利用该软件能够对不同生产工艺下的凝固坯壳厚度、坯壳表面温度、结晶器铜板温度、冷却水温差以及结晶器理想锥度等进行计算,分析和优化结晶器一冷制度,指导连铸生产。

Based on the heat transfer process in mould of heavy-plate continuous caster at Baosteel, combined with the principle of heat transfer in mould of slab in continuous casting, the solidification and heat transfer model in mould of heavy-plate continuous caster at Baosteel has been developed. The solidification and heat transfer process was divided into slab shell heat transfer, heat transfer between mould gaps, and mould copper plate heat transfer. The effects of air gap, mould flux and oscillation marks on heat transfer were taken into account in the model of heat transfer between mould gaps. Fortran, a computer language, was used to program for the model, and“Moheat” , the software for solidification and heat transfer in the mould was developed. In combination with production data of the mould for the heavy-plate concaster, the model was tested and the computing results agreed with the actual measured values. The software can be used to calculate thickness and surface temperature of slab shell, mould copper temperature, temperature difference of cooling water and ideal taper of the mould, etc. with considering the different continuous casting process. It can also be used to analyze and optimize the mould cooling system and guide the production.