共查询到17条相似文献,搜索用时 46 毫秒
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浸入式水口燃烧式烘烤预热温度场研究 总被引:6,自引:2,他引:4
浸入式水口在浇钢以前必须进行充分预热,利用燃烧的煤气烘烤水口是常用的预热烘烤方式。本工作运用有限元技术对浸入式水口燃烧式烘烤预热的瞬态传热过程进行了研究,得到了水口烘烤预热后的温度场分布和水口的升温曲线。研究结果表明,在燃烧式预热烘烤方式下,水口沿轴线方向的温度变化梯度较大,水口颈部预热后的温度较低,是导致水口颈部频繁断裂和较易出现竹节样裂纹的主要原因。欲提高水口颈部的预热温度,必须改进水口的预热烘烤方式 相似文献
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蓄热式钢包烘烤过程中包内高温低氧特性的数值模拟 总被引:2,自引:1,他引:2
为了分析入炉气体的预热温度对高温空气燃烧过程的影响,综合考虑体系的质量、动量、能量守恒以及燃烧体系的组份平衡,建立了煤气-空气双预热的三维非稳态燃烧数学模型,并以CFX4.3为计算平台,耦合流体流动、燃烧和换热过程,首次对蓄热式燃烧过程中高温低氧特性进行了数值研究,得出了在不同预热温度时,燃烧室内气体温度场和氧气浓度场分布. 结果表明, 提高气体预热温度有利于加快燃烧进程,提高燃烧室内气体的整体温度及温度均匀性,降低局部氧浓度. 相似文献
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李飞;周辉;杨枝超;唐中队;王正芳;刘威 《耐火材料》2024,(4):344-348
为了探究浇注成型刚玉-尖晶石预制件与机压成型刚玉-尖晶石机压砖作为钢包包壁工作衬的服役情况及蚀损机制差异,研究了使用200炉次后的刚玉-尖晶石预制件以及机压砖的外观、化学成分、物相组成、物理性能以及显微结构。结果表明:刚玉-尖晶石预制件的蚀损速率略小于机压砖的,其侵蚀层厚度远小于机压砖的。免烧的机压砖本身颗粒之间的结合强度要远低于水泥结合预制件的,这导致机压砖内部颗粒之间的结合更容易被熔渣破坏,因此,预制件具有更优异的抵抗熔渣渗透的能力。 相似文献
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选择钢包内衬用耐火材料时,应主要考虑包衬的使用条件、对钢水纯净度的要求、钢包操作的安全性.以及最佳的单位产品的费用支出.在欧洲大多采用碳质、铝镁碳质及方镁石刚玉碳质耐火材料作钢包工作衬.在钢包及钢包炉中对钢水进行炉外精炼时,则推荐采用镁碳质耐火材料. 相似文献
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1前言 在实际使用的钢包中,包底衬砖的特定地方发生剥落损毁,加快了损毁速度。因此,采用有限元素法进行了结构分析,研究了旨在抑制钢包包底衬砖断裂的内衬结构。 相似文献
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V. K. Orlov 《Refractories and Industrial Ceramics》2007,48(3):219-222
Metallurgists have always dreamed of an “eternal ladle”, i.e., the possibility of repairing a metallurgical ladle without
removing its old lining. However, the use of thick mixtures for this purpose is problematic, whereas thinner mixtures are
prone to cracking under cooling. The author demonstrates that the reason for such cracking is the temperature contraction
of the surface layer, which is the first to be cooled, as a consequence, a larger volume becomes enclosed in a shell of a
smaller capacity, which leads to its cracking. A method is proposed for cooling the inner volume of lining to remove temperature
stresses from the outer layers and prevent their cracking.
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Translated from Novye Ogneupory, No. 7, pp. 59–62, July, 2007. 相似文献
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A. V. Zabolotskii 《Refractories and Industrial Ceramics》2010,51(4):263-266
The thermal fields of the refractory linings of metallurgical equipment are investigated. Using as an example the lining of a steel-teeming ladle, mathematical modeling of the thermal fields in preliminary heating of the ladle and during smelting is performed. An approach to the construction of thermal fields, assuming the presence of defects in the lining and in the case of intersecting thermal fields, is proposed. 相似文献
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钢包内衬用无收缩性莫来石刚玉捣打料的开发 总被引:1,自引:0,他引:1
对冶金用含碳刚玉耐火材料在负压条件下进行了浸渍,探讨了采用不含苯并吡的碳素物质来取代煤焦油沥青进行浸渍耐火材料的可能性。 相似文献
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R. S. Aizatulov Yu. A. Marakulin A. P. Presnyakov N. Yu. Pokatilova V. V. Salomatov 《Refractories and Industrial Ceramics》1994,35(6):202-204
A structure for the lining of a tundish ladle made from domestic refractory materials is suggested in which the heat loss is less than in linings from imported materials. The hydrodynamics of the liquid pool depends on the ladle profile and the structure of the interstrand partitions. The best results (absence of stagnation pockets along the ladle length) are obtained when the partitions height varies betweenH/3 andH/7 from the second to the fourth partition and the partitions are arranged at 1/4 of the interaxial distance to the strand behind the partition.Translated from Ogneupory, No. 6, pp. 25 – 27, June, 1994. 相似文献