不同因素对浸入式水口预热温度场的影响

运用大型有限元分析软件ANSYS的FLO TRANCFD模块对浸入式水口在抽风式预热烘烤方式下的瞬态传热过程及影响水口预热温度场的各种因素进行了研究 ,得到了该烘烤方式下水口预热后的温度场分布和水口的升温曲线。研究结果表明 :影响水口预热温度的最主要因素是抽风流量和烘烤箱的几何尺寸 ;适当提高抽风流量、减小烘烤箱的几何尺寸可以大大提高水口颈部的预热温度 ,从而降低浸入式水口的事故率     

利用气体喷射引流技术强化浸入式水口的预热效果

为了提高现有抽风式预热烘烤方式下浸入式水口的预热效果 ,利用气体喷射引流原理 ,在靠近烘烤箱的抽风机吸气管道上增设一压缩空气管 ,构成简单喷射器 ,通过压缩空气的喷射引流来增加抽风流量 ,强化升温效果。研究表明 ,采用压缩空气引流后 ,可使抽风式烘烤装置的抽风流量由原来的 0 .2m3·s- 1提高到 0 .36m3·s- 1,水口的预热升温曲线更趋合理。采用压缩空气引流强化抽风预热烘烤 90min时 ,水口颈部外壁的温度提高 1 4 .8% ,比现有结构提高约 1 0 0℃ ,效果十分明显     

薄板坯连铸浸入式水口结构数值模拟

使用有限元计算方法开展薄板坯连铸浸入式水口流场的研究 ,分别对水口不同浸入深度的流场分布、水口出口不同角度的流场分布进行计算。结果发现 :水口的浸入深度在 30 0mm时较为合理 ;水口的出口角度以R1 5、60°、45°为宜     

MOGUL型浸入式水口

为防止钢水在浸入式水口中的再次氧化，研制开发了一种新型的被称之为MOGUL的内衬结构，并用水模型进行了模拟试验。通过流速分布、流型特性等分析，指出新型浸入式水口(SEN)能有效抑制水口和结晶器内发生的钢水偏流现象，改善了钢水质量。     

塞棒和浸入式水口在预热期间的性能

介绍了浇铸前对塞棒和浸入式水口进行预热试验以及获得的试验结果。这两种制品的预热是影响耐火制品使用寿命的主要因素，而且会将塞棒和浸入式水口的热震降至最低，从而提高耐火材料的寿命。     

隔热结构浸入式水口的传热模拟

1.前言 为了确认具有隔热结构的浸入式水口(见图1)的隔热效果,采用有限元法对操作中的水口温度分布变化情况进行了分析,并在已实用化的隔热层中充填陶瓷纤维和空心球。但是,有关隔热特性多不明确。因此,在本研究中根据模型试验及其结果进行数值分析,并将两水口的隔热效果进行了比较。2.操作中的分析     

Improving the erosion resistance of the submerged entry nozzle by applying an external electric field

In order to improve the erosion resistance of the submerged entry nozzle (SEN) in a continuous casting process, an electric field was applied between the SEN and the carbonaceous mold flux. In view of the extensive application of carbonaceous mold flux in the high-quality steel production process, the erosion behavior under carbonaceous mold flux was explored under the application of different electric fields, in terms of amplitude. The extracted results show that the erosion process between the carbonaceous mold flux and the SEN can be changed obviously by applying an external electric field. In addition, the increase of the carbon content in mold flux will promote the manifestation of erosion resistance effects. Under the control of the negative electric field, the decarburization, dissolution, adhesion, and reaction between the SEN and mold flux will be either suppressed or eliminated. Accordingly, the SEN material remains intact without any erosion and damage after the experiment. The application of electric field is anticipated to solve the problem of serious erosion in the SEN on the continuous casting process.     

防堵塞浸入式水口的使用

叙述了防堵塞浸入式水口的使用情况,对用后残砖分析表明以CaZrO3-C材料制作的浸入式水口,在浇注08Al钢时,有较好的使用效果,可实现多炉连浇。防堵塞效果主要取决于钢液中析出的Al2O3与防堵塞料的反应产物和钢水温度。     

连铸浸入式水口Al_2O_3结瘤现象的研究

综述了国外对铝炭质、铝锆炭质浸入式水口A12O3结瘤现象的研究现状。探讨了水口结瘤物的来源、分布状况、显微结构和结意形成机理，为研究抗A12O3结瘤的新方法和新材料提供了一定的实验和理论基础。     

ZrO_2-CaO-C-SiO_2质浸入式水口

研制了一种防止Al2O3附着的新型ZrO2－CaO－C-SiO2（以下简称ZCGS）材料，经在水口上模拟试验证明，该材质对防止Al2O3的附着有良好效果。     

Applied electric field on the reaction between submerged entry nozzle and alloy in the steel

In this study, the reactivity between nozzle and submerged entry nozzle and alloy elements in the steel (Al and Ce) under different electric field conditions was investigated. The results show that the decarburization of the nozzle is an important factor affecting the clogging behavior and steel quality. The external electric field directly affects and changes the decarburization, clogging, and reaction behavior between the nozzle and alloy in the steel. If the chemical reaction force between alloys and the nozzle is greater than the applied electric field force in actuality, the clogging will also occur on the submerged entry nozzle. In the future, this new method of controlling and changing the interfacial electric fields can be used to solve the problem of decarburization and clogging of the submerged entry nozzle.     

Slag corrosion between the mold flux and the submerged entry nozzle controlled by an external electric field

The corrosion mechanisms that occurred between the slag-line and mold flux under the applied external electric field are studied. The results show that the slag-line can be effectively protected when the slag-line is connected to the negative electrode, and the graphite as an auxiliary electrode is connected at positive potential. Under the applied negative electric field, a thick protective adhesion layer is formed on the surface of the slag-line due to the electrochemical reactions. Additionally, the slag-line material is further reacted with surface of the formed protective layer and generates another interface reaction layer. Under the effect of double protective layers, the slag-line can be perfectly devoid of corrosion attack under the negative electric field. The performance of the slag-line and the production time of the whole continuous casting can be improved. The external electric field is expected to be a new technical approach to alleviate corrosion of the SEN.     

浸入式水口复合内衬与钢水中Al_2O_3的反应

采用以AG（Al2O3-C）材料为主体,用ZCGS（ZrO2-CaO-C-SiO2）材质为内衬制成复合式连铸浸入式水口。ZCGS质内衬与钢液接触时,材料中的SiO2可促进CaZrO3分解生成CaO,形成CaO的扩散通道,加速CaO与钢液中的脱氧产物Al2O3反应生成低熔物相,从而起到防止Al2O3附着堵塞水口的作用。