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现代大型铝电解槽内复杂物理场的仿真计算与优化 总被引:3,自引:0,他引:3
总结了国内外在铝电解槽电热场、热应力场及电磁流场方面的研究进展,指出当前多物理场仿真计算算法的不足,介绍了最新开发的液(电解质)-液(铝)-气和液-气-固(颗粒)两类三相流模型、多物理场(电、磁、热、流、力、浓度分布场等)、磁流体稳定性和电流效率三维耦合仿真模型与算法,并提出基于多相-多场耦合仿真的大型铝电解槽结构与生产工艺综合优化方法,发现大型铝电解槽在3.7~3.9 V低电压下高效、低电耗、低排放、稳定运行的状态空间,并确立相应的工艺实现条件。 相似文献
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铝电解槽侧部槽壳散热三维仿真模型研究 总被引:1,自引:1,他引:0
以商业软件ANSYS为平台,建立了240kA预焙阳极铝电解槽槽壳热场的三维仿真模型,对其侧部散热进行了数值计算,并将计算结果与实测值进行比较,验证了模型的可靠性,得出了侧部槽壳散热的分布规律。充分考虑了槽壳结构对散热的影响,利用ANSYS辐射单元准确求解出各辐射换热面之间的角系数,使计算模型更加合理,为准确计算和分析铝电解槽侧部槽壳散热提供了一种可靠的方法和手段。 相似文献
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铝电解槽电热场1/4槽模型有限元解析方法及应用 总被引:1,自引:0,他引:1
借助ANSYS有限元分析软件,建立了铝电解槽1/4槽有限元解析模型,对其电、热场进行耦合计算,并以某厂156kA预焙阳极铝电解槽为研究对象,根据实测的电解槽运行数据对模型进行了检验,结果表明:本文所建立的1/4槽有限元解析模型的计算结果与实测值吻合较好(电压降偏差在30mV以内,炉帮特征尺寸偏差在2cm以内,槽壳表面温度偏差10℃以内),能较真实地反应铝电解槽内的电、热场的三维分布状况,可为铝电解槽的优化设计提供准确、快速且经济、可靠的研究手段。 相似文献
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365kA大型石墨化阴极铝电解槽电热场仿真研究 总被引:1,自引:0,他引:1
借助有限元分析软件ANSYS为平台,结合数值分析软件MATLAB,根据傅里叶传热定律和基尔霍夫导电定律,针对贵阳铝镁设计研究院的新型石墨化阴极大型365kA铝电解槽,建立三维几何模型和数学模型,结合设计理念、三度寻优智能电解槽生产管理软件控制思想与现场实测数据,以能量平衡为基础,对各个分子比等级相应的多个参数变量进行电热耦合模拟仿真计算求出,输出电压分布、散热分布数据,并绘制出等温线图,炉帮外形轮廓图。该模型与实测值吻合较好(各部分温度分布和散热量),为铝电解槽大型化设计优化和寻求合适工艺参数路线提供了一种可靠、精准和快速的方法和手段。 相似文献
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目的研究硫酸体系中元素铋、碲和硒的电沉积行为,为电沉积制备n型Bi2Te3-ySey温差电材料提供理论参考。方法采用电化学循环伏安测试技术,对硫酸溶液体系中铋、碲、硒三种元素的电沉积及不同元素间的共沉积过程进行研究。结果纯铋硫酸溶液体系中,Bi3+还原成单质铋的电化学反应是分步进行的,游离态和络合态的铋离子先后发生还原反应。纯碲硫酸溶液体系中,HTe O2+以吸附态和游离态两种形式先后发生还原反应。纯硒硫酸溶液体系中,溶液中的H2Se O3也通过分步还原反应生成硒单质。在Bi-Te-Se三元硫酸溶液体系中,Bi3+的浓度和基材对电沉积过程有显著影响,Bi-Te-Se化合物对电沉积过程具有促进作用。结论在Bi-Te-Se三元硫酸溶液体系中,Se,Te和Bi元素可依次在阴极表面发生还原反应而实现共沉积,从而制备出n型Bi-Te-Se温差电材料。 相似文献
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采用放电等离子烧结法(SPS)制备了三元缺陷化合物Cu Ga3Te5热电半导体,并分析研究了其结构和热电性能。XRD分析结果表明,该半导体为单相化合物Cu Ga3Te5,直接带隙宽度(Eg)约为1.0 e V。经热电性能测试分析,在717 K时Cu Ga3Te5的ZT值达到最大值0.3。 相似文献
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This article describes some of the fundamental aspects of thermoelectric power generation, which employs low-temperature heat
sources to create electricity. The focus is on a potential system design and viable thermocouple materials. Regarding generator
design, a system is proposed that uses forcedair circulation and a multistage heat-exchanger to efficiently convert the heat
content of a low-grade heat source into useful electricity. As for thermocouple materials, both p-type Fe-12.8Al-12.7Si and
n-type Fe-12.3Al conductors exhibit significant thermoelectric power-conversion capabilities, making them ideal candidates
for use in the proposed power-generation system.
K. Ono earned his D.Sc. at the University of Paris in 1966. He is currently a professor in the Department of Energy Science and
Technology at Kyoto University.
R.O. Suzuki earned his D.Eng. degree at Kyoto University in 1984. He is currently an associate professor in the Department of Energy
Science and Technology at Kyoto University. 相似文献
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《Intermetallics》2005,13(11):1225-1232
The orthorhombic compound Ru2Si3 is currently of interest as a high-temperature thermoelectric material. In order to clarify the effects of crystal orientation on the thermoelectric properties of Ru2Si3, we have examined the microstructure, Seebeck coefficient, electrical resistivity, and thermal conductivity of Ru2Si3 along the three principal axes, using these measured quantities to describe the relative thermoelectric performance as a property of crystal orientation. Ru2Si3 undergoes a high temperature (HT)→low temperature (LT) phase change and polycrystalline Si platelet precipitation during cooling, both of which are expected to effect the thermoelectric properties. The HT tetragonal→LT orthorhombic phase transformation results in a [010]//[010], [100]//[001] two-domain structure, while polycrystalline Si precipitation occurs on the (100)LT and (001)LT planes. The [010] orientation is found to posses superior thermoelectric properties (with the dimensionless figure of merit, ZT[010]/ZT[100]>4 at 900 K), due principally to the larger Seebeck coefficient along the [010] direction. The effect of the domain structure on the thermoelectric properties is discussed. 相似文献
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《Intermetallics》2014
The β-phase Zn4Sb3 has attracted much attention because of its high thermoelectric performance in the intermediate temperature range thanks to disorder in the Zn lattice site. In this work are presented structural, thermal, electric and thermoelectric characterization of Zn4Sb3 pure and Ag, Al doped, prepared by a simple synthesis. Structural and microstructural analyses reveal homogeneous one-phases having compositions in agreement with the nominal ones. After thermoelectric characterization, Ag doping results mostly effective in lowering the resistivity and Seebeck coefficient value, by introducing holes in the system. On the other hand, the Al substitution yields a very small decrease of the Seebeck coefficient but, at the same time, a significant decrease of the thermal conductivity mainly due to the depressed phonon contribution. The thermal conductivity behavior is the main responsible for the good thermoelectric performances of (Zn0.99Al0.01)4Sb3, whose thermoelectric figure of merit reaches the encouraging value of 0.23 at 260 K. 相似文献
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LIU Kegao XIANG Dong ZHANG Jiuxing 《稀有金属(英文版)》2005,24(3):257-260
Bulk CoSb3 with single phase was synthesized by mechanical alloying and spark plasma sintering (MA-SPS). The thermoelectric properties of bulk CoSb3 prepared by different technologies were investigated. All samples have the character of typical semiconductor electricity and their thermoelectric figures of merit (ZT) get the maximum values at 400℃. The highest ZT value is 0.0571, belonging to the sample sintered at 600℃ among all samples at all temperatures. 相似文献
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采用电化学沉积法,在ITO导电玻璃及钛片上沉积Bi2-xSbxTe3热电薄膜。采用循环伏安、SEM、XRD、EDX等技术分别对电化学沉积过程和薄膜的形貌、相结构、组成进行研究,并对其室温时的热电性能进行测试。结果表明,在含有Bi3+、HTeO2+和SbO+的硝酸溶液中,采用控电位沉积模式,可以实现铋、锑、碲三元共沉积,得到Bi2-xSbxTe3薄膜。薄膜热处理前用冷等静压处理可以提高薄膜的密实度和平整度,并有利于热电性能的提高。 相似文献
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采用MSC.Marc有限元模拟软件对加热钢坯进行埋偶试验,得出加热炉内部的实际炉气温度,并以此为边界条件。以钢坯入加热炉时的温度为初始条件,建立钢坯在加热炉内的三维温度场模型;计算钢坯在步进式加热炉内的温度场变化情况,得出不同热装温度的钢坯在加热炉内的温度变化;优化实际生产中的加热工艺。该研究为提高工厂生产效率,节约能源起到指导作用。 相似文献