薄板坯连铸结晶器铜板厚度对传热行为影响  

Effect of copper plate thickness on heat transfer behavior in thin slab continuous casting mold

作　　者：马硕[1] 罗衍昭 张聪聪 王皓[1] 王胜东[1] 季晨曦 MA Shuo;LUO Yan-zhao;ZHANG Cong-cong;WANG Hao;WANG Sheng-dong;JI Chen-xi(Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,Hebei,China;Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司,河北唐山063200 [2]首钢集团有限公司技术研究院,北京100043

出　　处：《连铸》2023年第3期42-46,54,共6页Continuous Casting

摘　　要：基于薄板坯连铸产线的实际生产数据,研究了铜板厚度对结晶器热流密度以及生产稳定性的影响。结果表明,随着铜板厚度由44.2 mm减薄至39.2 mm,结晶器热流密度由2.65 MW/m^(2)增加至2.82 MW/m^(2),结晶器“冷齿”指数由0.4增加至17.5,生产稳定性受到极大影响。为提高传热稳定性,解决铜板厚度减薄造成结晶器热流密度增大的问题,对结晶器冷却水流量进行优化,建立了铜板厚度与冷却水流量之间的关系,结晶器铜板厚度由45 mm降至39 mm,冷却水流量由8500 L/min降低至7225 L/min,以5.3 m/min拉速生产低碳钢时,结晶器宽面热流密度可稳定控制在2.7~2.8 MW/m^(2)。同时,冷却水的最小流速为11 m/s,仍可确保铜板与冷却水之间为强制对流状态,保证了铜板的使用寿命,结晶器“冷齿”指数由3.85降至0.73,有效提高了铸坯质量和生产稳定性。Based on the actual production data of thin slab continuous casting production line,the influence of copper plate thickness on the mold heat flux density and production stability was studied.The results showed that as the copper plate thickness decreased from 44.2 mm to 39.2 mm,the mold heat flux density increased from 2.65 MW/m^(2)to 2.82 MW/m^(2),and the mold“cold tooth”index increased from 0.4 to 17.5,greatly affecting pro-duction stability.In order to improve heat transfer stability and solve the problem of increasing mold heat flux due to the thinning of copper plate thickness,the cooling water volume of the mold was optimized and the relationship be-tween copper plate thickness and cooling water flow rate was established.The thickness of the mold copper plate was reduced from 45 mm to 39 mm,and the cooling water flow rate was reduced from 8500 L/min to 7225 L/min.When producing low-carbon steel at a casting speed of 5.3 m/min,the mold wide surface heat flux can be stably controlled between 2.7 MW/m^(2)and 2.8 MW/m^(2).At the same time,the minimum flow rate of cooling water is 11 m/s,which can still make the copper plate and cooling water in a forced convection state,ensuring the service life of the copper plate.The“cold tooth”index of the mold is reduced from 3.85 to 0.73,effectively improving the quality of the casting slabs and production stability.

关 键 词：薄板坯 结晶器 铜板厚度 冷却水流量 热流密度 

分 类 号：TF341.6[冶金工程—冶金机械及自动化]