中间包两相流场的数值模拟和操作优化

为了提高20#碳钢连铸管坯的产品质量，通过对气泡和非金属夹渣的形成机理以及对中间包内钢水流场数值模拟的研究分析，发现中间包的结构与操作对20#钢连铸坯的生产质量具有较大影响，因此，对中间包的结构与操作进行了优化研究，研究结果显示：(1)通过对中间包的结构优化提高了中间包的钢水液面高度，增加了钢水在中间包内的滞留时间，有利于夹杂物和气泡的消除，从而提高了钢水的均匀性；(2)改进钢水流入、流出中间包的操作，能避免钢流与空气的直接接触，减少钢水的二次氧化；(3)连铸钢水过热度的严格控制，有利于减少钢水的二次氧化和对包衬耐火材料的浸蚀，从而起到降低铸坯中非金属夹渣物的效果。采取这些措施后，2#钢连铸坯的质量取得了显著提高，设备寿命明显延长。

Numerical Simulation of Flow Field and Optimal Operation for the Tundish

In order to enhance the quality of 20 # carbon-steel on the continuous casting production line,formation mecha-nism of pinholes and non-metallic inclusions in billets and numerical simula tion of flow field about molten steel in tundish by a mathematic model is st udied and analyzed.It is shown that the structure and operation of tundish p lay an important part for quality assurance of the20 # carbon-steel's products.So some studies about the structure and operatio n of tundish have been carried as follow:(1)optimizing the tundish construc tion,to enhance the height of molten steel in tundish,and lengthen the resi dence time of molten steel,which is useful for full blend and diffusion of pinholes and non-metallic in-clusions in billets and for homogenization of molten steel;(2)improving the influent and effluent operation of liquid steel,to avoid the contact of liquid steel with air,decrease re-oxidation ;(3)the casting temperature has been controlled more closely,to decrease th e non-metallic inclusion content in billets because of the re-oxidation of steel and to reduce the erosion of tundish Lining.After above measures being taken,the quality of 20 # carbon-steel and the service life of equip-ment had been improved remar kably.