为降低700 mm×700 mm特大方坯连铸机高度，保证大方坯的顺利生产，提出一种内置冷却器的结晶器技术，即“回”字形结晶器。利用计算流体动力学（CFD）软件FLUENT对此结晶器内钢水流场及温度进行模拟，对无内冷却器偏转水口注流结晶器、无内冷却器四孔水口注流结晶器内流场及“回”字形注流结晶器流场、温度场进行研究，表明“回”字形结晶器可以形成水平旋流、均匀钢水成分及坯壳生长、降低钢水冲击深度，部分达到电磁搅拌（M-EMS）的冶金效果，温度场模拟结果表明出口坯壳厚度达到49 mm，满足工艺要求。

A mould technology with an inner cooling apparatus was proposed，which was aimed to reduce the continuous casting machine?height of 700 mm×700 mm?super-large billet and ensure the?production?of bloom smoothly. Flow and temperature fields in the inner of crystallizer was simulated using the FLUENT of computational fluid dynamics software，including deflection nozzles without an inner cooling apparatus，four nozzles without an inner cooling apparatus and deflection nozzles with an inner cooling apparatus. The result shows that the crystallizer with an inner cooling apparatus could form level swirling flow，uniform steel component and growing of the shell，reduce the liquid steel rushing depth and partly achieve the metallurgical effect of M-EMS. The temperature field study indicates that the shell thickness reaches 49 mm in exit and meets the requirement of industry.