薄板坯连铸用浸入式水口国产化的开发与应用

介绍了薄板坯连铸用浸入式水口的使用特点和FFSC浸入式水口的技术特点,进行了国内薄板坯连铸用浸入式水口的研究与开发,通过在唐钢薄板坯连铸上的应用,其各方面性能满足薄板坯连铸的需要。     

连铸用浸入式水口的进展及展望

介绍了浸入式水口的结构和发展及其本质的发展历史过程,着重介绍了不同时期不同材质浸入式水口的优缺点,并对浸入式水口的发展趋势进行了分析.     

连铸用浸入式长水口的发展

本文总结了我国连铸用浸入式长水口的发展过程,着重介绍了熔融石英质和铝碳质浸入式水口的工艺研究,产品性能,使用效果,存在问题及今后努力方向.最后,为今后的研究工作提出建议.     

攀钢连铸用耐火材料

本文介绍攀钢连铸系统中的钢包，中间包用耐火材料以及长水口，塞棒，浸入式水口等耐火原件的功能，要求，现状及发展。     

连铸用功能耐火材料的发展

介绍了钢铁连铸用浸入式水口、中包水口、长水口及塞棒等功能耐火材料的发展现状,指出今后的研究重点应是通过复合抗冲刷性能优良且透气性能好的内衬料,解决快换中包水口内衬不抗冲刷、容易向内衬中渗钢水、吹氩效果不理想的问题,开发多功能、高性能和长寿命的连铸用耐火材料.     

连铸浸入式水口浇铸技术进展

分析了连铸浸入式水口的特点,介绍了目前浸入式水口存在的渣线侵蚀、内壁结瘤、出口偏流等技术问题,总结了减少水口浇铸失效的技术与措施,阐述了浇铸技术的主要特点,提出了解决水口问题的新方法。     

宽板坯连铸结晶器浸入式水口结构优化的研究

针对宽板坯连铸生产现状,采用商业软件PHOENICS对其建立三维数值模型,模拟宽板坯连铸结晶内钢液的流场分布.研究了不同水口倾角、插入深度及拉速等参数条件对结晶器内流场的影响,得出了适用于宽规格结晶器合理的浸入式水口.这为优化宽板坯结晶器内钢液的流场及浸入式水口结构及确定合理的工艺参数提供了科学依据.     

薄板坯连铸过程浸入式水口堵塞的研究

针对薄板坯连铸过程浸入式水口的堵塞情况,研究了浸入式水口的堵塞机理。生产实践表明。Ca处理是改善薄板坯连铸钢浇注性能的有效措施。     

浅谈连铸用浸入式水口和长水口的结构与材质

本文对连铸用浸入式水口和长水口的性能，结构和材质进行了比较，简谈了提高浸入水式水和和长水口寿命的措施。     

连铸用耐火材料

随着连铸技术的不断进步,对耐火材料的要求也越来越苛刻。因此,各国都积极开发并使用各种功能耐火材料。文内比较详细地介绍了中间包、整体塞棒和滑动水口、长水口和浸入式水口、分离环、定径水口、钢水过滤器等所使用的耐火材料及其性能。     

板坯连铸过程中水口堵塞的分析与解决措施

本文分析了在铝镇静钢的连铸过程中侵入式水口堵塞的基本原因,论述了解决水口堵塞问题的一些可行对策,有利于改进连铸生产及产品质量。     

攀钢板坯连铸结晶器内流场的水力学模拟研究

采用水力学模拟方法研究攀钢板坯连铸结晶器内流场,分析浸入式水口结构尺寸、塞棒吹Ａｒ量和拉速等工艺参数对连铸结晶器内钢液流动状况的影响,在此基础上优选出适合攀钢板坯连铸工艺的浸入工水口结构尺寸及相关参数。     

Three-dimensional analysis of molten steel flow in slab continuous casting mould with rotated ports in submerged entry nozzle

Abstract

The purpose of this study is to develop a three-dimensional (3D) analysis system capable of analysing the flow field of molten steel in the slab continuous casting mould with rotated ports in the submerged entry nozzle. The ultimate goal is to obtain the optimal design for the entry ports of the submerged nozzle, which can introduce favourable flow patterns to remove non-metallic inclusions and avoid entrapment of molten slag and casting powder to produce steel slab of high cleanliness. In this study, a computational fluid dynamics technique, Sola-Surf, is employed to conduct the 3D fluid flow analysis. The technique has the capability of treating fluid flow problems with a free surface that slightly vibrates. The slightly vibrating free surface presents fairly accurately the behaviour of the molten slag–casting powder layer in the continuous casting mould. The developed simulation system is then tested on a slab continuous casting mould to analyse the fluid flow behaviour of molten steel under various nozzle designs. The design conditions include submerged depth of the nozzle, tilted angle of the nozzle port, and rotated angle of the nozzle port. The results of the simulations show that of the various design factors rotation of the nozzle entry ports has the greatest effect on the flow pattern. It can prolong the residence time of the molten steel and stabilise the molten slag–casting powder layer, which is very favourable for obtaining continuous casting slag of high cleanliness.     

板坯连铸水口内钢液流动的数值模拟

 运用CFX计算软件研究了大通钢量工况下板坯浸入式水口流场,分析了水口结构、结晶器流动控制方式、水口吹氩等对浸入式水口流场的影响。研究表明,适宜的水口结构和控流方式组合能获得最优的水口出口流股形态和稳定均衡的流场。在大通钢量下,塞棒、底部凸起水口结构是最佳组合。不适宜的工艺组合形成并加重水口偏流,造成结晶器初始坯壳的不均匀冲刷和液面涡流,进一步诱发水口堵塞、水口结瘤、结晶器非稳态和不均衡传热,最终导致铸坯缺陷甚至诱发拉漏事故。     

八钢板坯连铸中包浸入式水口结构的优化

总结了板坯连铸结晶器浸入式水口对结晶器流场的影响,通过数学模拟及现场大量试验。选定了适合八钢板坯连铸现场条件的浸入式水口,解决了结晶器角部扰动的问题,提高了板坯质量。     

40Cr钢浸入式水口结瘤分层结构的形成机理

  为明确转炉→LF精炼→连铸工艺条件下生产40Cr钢浸入式水口结瘤分层结构的形成机理，采用扫描电镜、阴极发光仪以及FactSage 7.1热力学软件，对40Cr钢水口结瘤形貌及分层结构进行了研究。结果表明，浸入式水口结瘤物分为水口脱碳层、凝钢层、夹杂物堆积层、凝钢层和表面疏松层。分析了40Cr钢在连铸过程中钢中Al2O3、Al2O3 CaO(SiO2)和Al2O3 MgO尖晶石在水口内壁上的分层沉积现象。结合现场工艺，研究了双凝钢层的形成机理，并通过热力学计算解释了结瘤物的形成机理。     

长水口安装机械手改造

连铸无氧化浇铸包括长水口和浸入式水口吹氩保护,开工以来,由于长水口安装机械手设计不合理,使长水口无法使用。直接影响连铸板坯质量和品种开发。本文根据长水口安装使用要求,分析了机械手存在的问题,提出改造方案（已实施）,并对改造成果进行了总结。     

Investigation of the Gas‐Liquid Flow in a Stopper Rod Controlled SEN

Argon injection is widely used to reduce nozzle clogging during continuous casting, but its effects on the flow in the submerged entry nozzle are not yet fully understood. Therefore, the gas liquid flow in a stopper rod controlled submerged entry nozzle is investigated experimentally and numerically. First single‐phase liquid flow is studied. Numerical results are compared with experimental data, which show good agreement. Then the numerical model is extended to gas‐liquid flows. The Euler‐Euler approach is employed in order to describe the two‐phase flow in the submerged entry nozzle. Again, numerically obtained flow rates are in satisfactory agreement with experimental findings. However, some flow phenomena which are observed in the experiment are not resolved by the two‐phase flow model.     

板坯连铸浸入式水口结构优化试验研究

本文通过对扳坯连铸浸入式水口的水模试验,提出了水口结构的优化参数及最佳工况条件。