大方坯连铸T型四流中间包流场优化及应用

Optimization of flow control devices and application of four-strand T type tundish for bloom continuous caster

针对某钢厂现有四流大方坯T型中间包冲击区小、湍流比较严重、近端和远端出流钢水温度不均等问题,根据相似原理建立了1∶3的物理模型,研究了不同结构的挡墙、导流孔和湍流抑制器对中间包内流动特性的影响。通过水力模拟研究,对现有控流装置存在的不足进行改进,提出优化的中间包控流结构D1方案:采用湍流控制器,V型堰上开低孔,在近端和远端两流间加一道200 mm高的低坝。优化方案冲击区容积占整包容积提升至30%;活塞区体积分数远端为18%,近端为17%;死区体积分数远端为10%,近端为10%。现场实测分析可知,优化方案克服了原设计中间包的不足,中间冲击区和浇注区(远端、近端流之间)的温差显著降低,相较于原有中包结构冲击区和浇注区(远端、近端流之间)温差均值为10 K,优化中间包结构的冲击区和浇注区(远端、近端流中间)的温度温差降低至5 K,能够满足实际生产过程的需求。

Aiming at the problem that the existing four-flow bloom T-type tundish impact area is small,the turbulence is serious,the temperature of the proximal and distal outflow molten steel is not uniform,A four-strand T type tundish is studied by using water modeling based on similarity principles. A 1∶ 3 physical model is built to study the influence of different walls,diversion holes and turbulent inhibitors on flow characteristics. D1 an optimized tundish flow structure is proposed,using turbulent inhibitors,low hole in V-type wall,low dam between the two streams. Impact area volume ratio increase to 30%,distal piston area volume fraction increase to 18%,proximal piston area volume fraction increase to 17%,both distal and proximal dead zone volume fraction down to 10%.According to the results actual testing results,it can be seen that the improved tundish has overcome the un-rational aspects in the original design,the temperature difference between the impact zone and the pouring area is significantly reduced,compared with the original tundish,the temperature difference of the D1 scheme is reduced from the mean of 10 K to 5 K,it can satisfy the needs of actual production process.