WU Tong
,
CHENG Su-sen
钢铁研究学报(英文版)
Copper staves have been equipped on nearly all of BF (blast furnaces) with volume over than 1000 m3 in China since their introduction from abroad about more than 10 years ago. Because of short application and lack of experience, phenomena of thickened or naked of copper stave happen occasionally which influence production severely. So it is important to study the model of forming-accretion on BF copper stave and realize real-time monitoring of forming-accretion on different copper staves. Therefore, mathematic model of calculating accretion thickness by heat flow of BF is proposed, and the calculated results indicate that accretion thickness could be kept at a reasonable range of around 50 mm by controlling heat flux around 22.0 kW/m2. The monitoring program based on the model was applied to a certain BF in China successfully, and it is found that slip of BF near the inner wall is one of most important reasons that cause fluctuation of accretion thickness. During the period of scheduled maintenance of the certain BF, the thickness of accretion measured through the static pressure holes is in good accordance with the value calculated by the monitoring program, so the results calculated by the monitoring program can be used to guide industrial production.
关键词:
blast furnace
,
copper stave
,
forming-accretion
,
monitor
,
industrial application
WU Su-zhou
,
ZHANG Jiong-ming
,
LI ZHi-zheng
钢铁研究学报(英文版)
The SEN clogging is a long term issue for all the steelmakers. In the current study, the kinetics of SEN clogging during steel continuous casting was established. The dynamic build-up of alumina inclusions to the lining refractory of SEN was analyzed. The fluid flow and inclusions motion are calculated by means of mathematic model. Effect of diameters of inclusions, roughness of nozzle, diameter of nozzle and casting speed on the entrapment probability are estimated.
关键词:
nozzle clogging;mathematic model;inclusion motion
B.W. Li
,
X.Y. Tian
,
E.G. Wang
,
J.C. He
,
null
,
null
,
null
,
null
金属学报(英文版)
In recent years, thin slab continuous casting technology has been widely used to improve the quality of the product and to reduce
the cost. One of the challenges faced by this technology is to design reasonable flow patterns, which strongly affect the surface
and inner properties of the final slab in the mold. With the fixed scales and complex geometrical structures of nozzle and funnel
type mold, a series of numerical simulations are made to analyze the flow patterns in melt steel using finite volume method based
on structured body fitted coordinate grids. The CFD (computational fluid dynamics) package is validated first using one typical case described in previously published studies, and then it is developed to study the effect of operational parameters on fluid
flow in thin slab caster. Two operational parameters, casting speed and SEN depth (submerged entry nozzle), are mainly
considered for numerical analysis. On the basis of present simulations, the reasonable SEN submergence depths corresponding to different casting speeds are suggested according to fluid flow characteristics like, flow jet impingement on the narrow side of
the mold, flow speed of the melt steel beneath the meniscus and the recirculation region. This is the first stage of study on the numerical analysis of the whole thin slab casting process with electromagnetic brake.
关键词:
continuous casting
,
null
,
null
陆振华
,
许宝建
,
金庆辉
,
赵建龙
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2008.03.015
PDMS是制作微流控芯片的主要材料.PDMS芯片制作的主要方法是模塑法,模塑法要求有良好的塑性成型模具.SU-8以其良好的微加工特性,目前已广泛应用于微机械结构的制作,也用于PDMS塑性成型的模具.本文根据模具的特殊性,如平整、无裂纹、可多次使用等要求,研究了影响SU-8模具结构与基底材料硅片的黏附性和形成裂纹的因素,优化了SU-8微模具加工工艺,在以0.5℃/min进行升降温、210 mJ/cm2的曝光剂量、200℃条件下硬烘30min条件下得到较好的SU-8模具,提供了一种快速、复用性高、低成本的PDMS微芯片塑性成型的SU-8模具的制作方法.
关键词:
PDMS
,
塑性成型
,
SU-8模具
,
黏附性
刘俊
,
常梦洁
,
杜慧玲
高分子材料科学与工程
doi:10.16865/j.cnki.1000-7555.2016.04.023
利用静电纺丝和紫外光刻技术直接制备了不同结构的SU-8光刻胶纳米纤维薄膜及图案阵列.通过光学显微镜和扫描电子显微镜表征了纳米纤维的形貌、尺寸及结构.结果表明,通过改变SU-8光刻胶的黏度可形成不同直径和形貌的纤维结构,其中用SU-8 3010和SU-8 3050光刻胶制备的纳米纤维具有最优的形貌,其平均直径分别为470 nm和610nm.利用带有长方形缺口的铝箔和同轴电纺的方法分别制备了平行趋向和空心结构的纳米纤维.通过紫外光刻过程,可将SU-8纳米纤维加工成点阵、条状等不同形貌的图案阵列或结构,有望用作细胞培养研究的功能基底材料.
关键词:
静电纺丝
,
纳米纤维
,
SU-8光刻胶
,
纤维图案
张金娅
,
陈迪
,
朱军
,
李建华
,
方华斌
,
杨斌
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2005.02.027
采用新型SU-8光刻胶在UV-LIGA技术基础上制备了各种高深宽比MEMS微结构,研究了热处理和曝光两个重要因素对高深宽比微结构的影响,解决了微结构的开裂和倒塌等问题;优化了SU-8胶工艺,从而获得了最大深宽比为27:1的微结构.
关键词:
UV-LIGA技术
,
SU-8胶
,
高深宽比微结构
黄纯青
,
万广仁
量子电子学报
doi:10.3969/j.issn.1007-5461.2005.01.009
构造了激发双模SU(2)相干态|M,ξ;m〉=AMξma+mb+m|M,ξ〉,并用数值方法研究其非经典特性.结果表明,在双模SU(2)相干态的两场模同时增加光子后,两模光场仍然保持反关联特性,而且可以使光场对Cauchy-Schwartz不等式的破坏程度、光场的反聚束效应以及光子统计亚泊松分布等非经典特性得到加强.
关键词:
量子光学
,
非经典特性
,
激发
,
双模SU(2)相干态
