共查询到20条相似文献,搜索用时 15 毫秒
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现代化高效连续炼钢的关键是钢水温度控制,钢包热状态是钢包周转过程中钢水温降的重要影响因素,因而烘烤结束时的钢包热状态至关重要.由于钢包内部温度较高,生产场地布局复杂,电子原件的使用寿命较短等原因,传统的实测法和数值模拟等方法都无法实现包衬内部实时接触式测温.针对上述情况,文章运用有限差分法正向求解包衬温度场,再建立非稳态的钢包传热一维数学模型,采用Fluent软件模拟火焰温度场,用传热反问题研究方法以钢包易测量的包壳温度为已知条件,对包衬温度分布进行数学反演,并通过计算机C#语言对210t钢包烘烤过程进行智能化模拟追踪,编写了烘烤过程的温度场实时监控软件,为钢包调度和编制合理的烘烤制度提供了一个切实可行的新方法. 相似文献
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为了确定合适的钢包烘烤预热温度,以某钢厂90t整体铝镁浇注料钢包为原型进行数值模拟,利用有限元分析软件ANSYS,采用间接耦合法进行计算,得出了不同烘烤预热温度工况下,钢包盛钢时的内衬温度变化及应力分布。结果表明:提高钢包预热温度可以降低钢包内衬的温升及钢液温降幅度,减小钢包内衬的温度梯度,减少内衬材料受热应力所引起的热震破坏,从而延长钢包使用寿命。综合考虑钢包内衬水分排除、节能及热应力分布等因素,钢包预热温度取1 173~1 273K最佳;钢包底部的烘烤预热温度应提高到1 373K。 相似文献
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Monolithic materials with a strong thermal insulating effect are required by the foundry industry for further energy savings, meanwhile possible premature wear of refractory linings caused by over-insulation should be avoided. A monolithic insulating material containing lightweight aggregates possessed strong thermal insulation and was proposed to replace the traditional insulating material made of chamotte currently used in a channel induction furnace. To evaluate the new lining concept, creep of the working lining was considered in the finite element modelling and followed the classical von Mises creep model, which was defined with the Norton–Bailey strain hardening creep equation. The results showed that the lightweight design of the insulating lining reduces the heat loss from the steel shell and material consumption. Moreover, the thermomechanical loads in the refractory linings and steel shell remain within a reasonable range when compared with the currently in-use refractory lining concept. 相似文献
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Transient, turbulent flow and heat transfer in a ladle during the holding period are numerically investigated. The ladle refractories
including the working lining, safety lining, insulation layer, and steel shell have been simultaneously taken into account.
No assumptions are made for the heat transfer between the liquid steel and the inside ladle walls. Both the initial ladle
heating and the heat loss from the slag surface are changed to examine their effect on thermal stratification in molten steel.
A simplified model for the heat loss from the molten steel to the refractory is proposed. Correlations for the history of
mean steel temperature, thermal stratification, and heat loss rate are obtained, which can be easily applied for industrial
operations. Predictions are compared with experimental data in an industrial ladle and a pilot plant ladle, and those from
previous studies. 相似文献
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为了研究包衬侵蚀对钢水温降的影响规律,通过ANSYS有限元软件以及ParaMesh网格随移技术建立了考虑包衬侵蚀的钢包传热计算模型,研究并分析了包衬侵蚀对包衬及钢水温度的影响规律。结果表明,包衬侵蚀对包衬温度影响较大,在相邻两个修包周期内,包衬侵蚀造成渣线和包壁的包衬内部(工作层与永久层交界处)温差为14~114 K;包衬侵蚀导致包壳外表面温度升高,包壳向外散热增加,与此同时,包衬受侵蚀变薄,蓄热减少,两者同时作用导致包衬侵蚀对钢水温降影响不大,最高不超过1 K,在实际生产中可以适当地忽略钢包侵蚀对钢水温降的影响。 相似文献
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通过对鞍钢炼铁厂铁水罐外表散热过程的理论分析与计算得出:在改变现有铁水罐外型条件下减薄罐衬,可以扩大制度容,对减少铁水温降、降低钢成本和能耗都有极大的作用。 相似文献
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André Zimmer lvaro Niedersberg Correia Lima Rafael Mello Trommer Saulo Roca Bragana Carlos Pérez Bergmann 《钢铁研究学报(英文版)》2008,15(3):11-0
The heat transfer in a steelmaking ladle was studied. The evaluation of heat transfer of the steel was performed by measuring steel temperature in points including all refining steel process. In the ladle, the temperatures in the refractories and the shell were also measured. To evaluate the thermal profile between the hot and cold faces of the ladle in the slag line position, an experiment which shows the importance of thermal contact resistance was carried out. Higher heat losses in the tapping and the vacuum were verified. The temperature measurements of the ladle indicate distinct thermal profiles in each stage of steel refining. Moreover, as each stage of the process depends on the previous one, the complexity of the ladle thermal control is incremental. So a complete model of heat losses in the ladle is complex. 相似文献
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摘要:连铸技术对钢包的性能要求越来越高,而传统钢包炉衬构件普遍存在使用寿命短、消耗高等问题。通过研究耐火材料特性,优化内衬结构布置,设计出一种长寿命、超保温的新型钢包,并基于数值模拟技术,对新型钢包与传统钢包在典型工况下的温度与应力进行对比分析。温度场模拟结果表明,新型钢包在保温性能上有较大的提升,钢包壳最高温度较传统钢包降低54℃。同时,应力场结果表明,新型钢包壳的最大应力减小了66.7MPa且整体应力分布更加均匀。最后将温度场和应力场的分析结果反馈到钢包的生产、制造、维护上,并进行实验验证。实验结果表明,新型钢包在保温与长寿等性能方面表现更好,内衬寿命提高了119炉次,达到了钢包设计、制造、维护一体化的效果。 相似文献
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钢包内衬耐火材料的选择与使用 总被引:1,自引:1,他引:0
从耐火材料的材质、经济性、使用部位、精炼工艺、浇注工艺、耐火材料的相互作用、冶炼的钢种、吊车能力等8个方面,论述了如何选择钢包耐火材料,文章还以梅山钢厂150t钢包为例,详细介绍了耐火材料的选择及使用情况。 相似文献
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建立了基于有限元法的钢包二维传热模型,运用Ansys软件对钢包在不同绝热层厚度情况下的热状态及保温性能分别进行了模拟计算.有绝热层的钢包可以明显地提高自身的保温性能,且随着绝热层厚度的增加,保温效果愈加突显,但幅度越来越小.与无绝热层的钢包相比,在绝热层厚度达到20 mm时,钢包预热时间缩短约1 h,节约煤气消耗1000 m3,降低钢水温降约6℃.在热饱和阶段,钢包外壁温度平均降低了100℃,包壁散热减小,1h可以节能1255680kJ,折合标准煤43kg.最后利用现场实测数据进行了验证,结果表明模拟结果正确可信. 相似文献
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提高精炼钢包使用寿命及降低钢包耐材成本的途径 总被引:1,自引:0,他引:1
钢包既盛装钢水,又作为精炼设备,因此,精炼工艺的改进对钢包内衬耐火材料的使用有着较大的影响。同时通过选用优质适价且适应于钢包精炼工艺的耐火材料,优化钢包内衬修砌工艺,加强钢包修砌运行管理,建立科学合理的耐材判废标准,可有效提高钢包内衬使用寿命,降低成本消耗,从而保证生产顺行。 相似文献
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本文简介了宝钢300t钢包内衬在二期连铸生产后出现了钢包寿命缩短以及进行了改进概况,并对包龄下降及修理量增加的直接原因进行了分析;对比了铝镁碳不烧砖、含硅线石微膨胀高铝砖、SiC-腊石不烧砖等新材质的试验情况,以及在包衬修理上采用喷补技术,均取得较好的效果。 相似文献
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