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钢包吹氩引起的钢水温降分析 总被引:7,自引:0,他引:7
通过现场实验测试,认为钢包炉吹氩搅拌过程中,氩气升温吸热对钢液温降的影响极少,分析认为钢液产生较大温降主要原因是包衬蓄热和吹氩过程中形成的钢液裸露面对外散热,同时指出钢包内钢液温度的分层可减少通过包衬散热所带来的热损。 相似文献
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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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用连续测温技术测定了有底吹氩气搅拌的实验钢包电渣加热时不同加热功率条件下的钢水升温曲线。考察了加热前后钢水成分和炉衬侵蚀情况。与等离子电弧加热比较,电渣加热具有热效率高,成本低和操作简单等优点,适用于工业钢包和中间包的钢水加热。 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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Suat Yilmaz 《国际钢铁研究》2003,74(8):485-490
Numerical methods can be applied on metallurgical processes like engineering design of a steel ladle. In this study, the thermomechanical behaviour of refractory lining of a steel ladle which is lifted by a crane was investigated. To simulate this behaviour coupled heat transfer – structural analysis was made by using FEM (Finite‐Elements‐Method). For these calculations a two‐dimensional, an axially symmetrical geometric model and a FE‐model of a steel ladle with wear lining consisting of MgO‐C brick in the slag zone and castable MgO‐Al2O3–spinel in the working zone were created. Thermal stresses, hydrostatic pressure, gravity of molten steel and slag and refractory lining were used as boundary conditions. The results gained from the calculations showed that the maximum total displacements were observed at the bottom lining of the ladle. 相似文献
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原复合反射绝热板热导率系数值较大,钢包包壳温度较高,在使用过程中钢水温度损失大;而新型气凝胶绝热板是以纳米材料为主,主要材质为SiO2气凝胶,具有导热系数低、耐高温、密度小、抗压强度高等优越性能。某钢厂120 t钢包保温层用新型气凝胶绝热板替代原复合反射绝热板的效果表明,钢包包壳表面温度平均下降59~73 ℃;通过两种钢包包壳温度计算得出,在生产中,钢包每周转一次,可节省钢水温损9.88 ℃,钢水温降速率降低0.11 ℃/min;通过实测LF炉软吹结束钢水温度及铸机开浇时钢水温度,钢水温降速率降低0.12~0.13 ℃/min,实际钢水温降速率与钢包包壳节省温度计算的钢水温降速率基本吻合,成本下降2.7元/t(钢),取得了良好的试验效果,为新型气凝胶绝热板在钢厂其他保温设备上的应用提供了重要的参考价值。 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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Mathematical modeling of transient fluid flow and heat transfer of melt in the ladle has been carried out, both before and
during teeming of the melt to a tundish. The model involves solution of the transient, two-dimensional form of the turbulent
Navier-Stokes' equation along with the equations of turbulence energy, energy dissipation rate of turbulence energy, and thermal
energy conservation in the cylindrical coordinate system. Two different heat loss conditions have been assumed to occur from
the top free surface of the melt in the ladle. When the ladle has an insulating layer of slag, temperature stratification
occurs within the melt with the coolest melt in contact with the ladle bottom. The degree of temperature stratification increases
with the increase in holding time. Pouring of the melt from such a ladle to the tundish, however, results in near uniform
ladle stream temperature during the 47 minutes of pouring period considered in the present study. This is especially true
if the melt in the ladle is held for a period of 20 minutes prior to teeming. When the melt in the ladle loses an appreciable
amount of heat from the top due to a thin layer of slag, the average temperature of the melt drops considerably during the
holding period although there is no temperature stratification. Pouring from such a ladle results in a continuous decline
of the ladle stream temperature, even though the pouring starts after a holding period of 5 minutes.
Formerly Graduate Student, Department of Materials Science and Engineering, Ohio State University 相似文献
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AO Huang Huazhi Gu Meijie Zhang Ning Wang Ting Wang Yang Zou 《Metallurgical and Materials Transactions B》2013,44(3):744-749
According to parameters of the refining ladle with argon bottom blowing, the mathematical model describing the erosion behavior of ladle lining materials was established, the flow process of molten steel and thermal transmission of ladle lining were coupled, and the erosion of ladle lining in the condition of blowing argon at the bottom was researched. It has been found that either single or double blowing is applied, the larger erosion rates are mainly distributed in the slag line and the area of ladle lining near purging plugs, and the erosion is accelerated with the gas flow rate increasing, so the areas with higher erosion rates of the lining should be enhanced to avoid early partial damage. The erosion rate of ladle lining with double blowing is larger and the distribution of erosion is obviously different as the gas flow rate is increasing; serious erosion areas are in the slag line region and the higher erosion areas are concentrated on the slag lining and extended toroidally. And, as the distance between the purging plug and the lining of ladle is shortened, the partial erosion is easy to deteriorate and the refractories in the area with higher erosion rate need specialized selection and design. Meanwhile, the purging plug should be located away from the lining wall under the condition of good blowing effect in order to avoid increasing of the partial erosion and shortening of the lining service life. 相似文献
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