共查询到19条相似文献,搜索用时 922 毫秒
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本文收集和分析了目前国内采用炭砖综合炉底结构的高炉炉缸、炉底侵蚀重新恶化的情况和原因,提出了采用结构致密、灰分低、抗碱性及抗氧化性较强、导热系数及抗压强度较高的半石墨质炭砖取代目前国内高炉所采用的普通炭碳,以达到延长高炉炉缸炉底寿命,适应高炉强化冶炼之要求。 相似文献
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影响高炉炉底炉缸炭砖使用寿命的因素 总被引:6,自引:1,他引:6
对影响高炉炉底、炉缸炭砖使用寿命的因素进行了分析,认为作为长寿高炉炉底、炉缸炭砖必须具备高抗热应力、高抗碱金属侵蚀、高抗CO分解侵蚀、高抗铁水渗透、高抗氧化性能以及高抗铁水溶蚀性能。 相似文献
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在高炉炉料中适当的添加含钛物料目的有二: 1.防止高炉炉缸过早地被侵蚀,延长高炉寿命; 2.控制钢中的氮。 对于第一点,高炉操作人员大都知道并且含钛物料能有效地延缓高炉炉缸的侵蚀已被证实。日本、英国和澳大利亚的高 相似文献
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高炉长寿化是大型高炉发展的必然趋势,实现高炉长寿的关键在于弄清高炉侵蚀的根本原因。从高炉炉缸侵蚀机理、高炉炉缸象脚型侵蚀原因、高炉炉缸圆周方向侵蚀不均匀性、高炉冷却强度与冷却效率以及高炉炉缸维护技术等5个方面探讨了高炉长寿存在的共性问题,指出高炉炉缸炭砖损毁的本质是碳不饱和铁水对炭砖的溶蚀。具体结果表明,首先,高炉炉缸象脚型侵蚀最严重部位位于高炉炉缸死料柱的根部位置;其次,阐明了直接导致高炉存在不均匀侵蚀的主要原因在于冷却系统的冷却水量和送风系统的风量在高炉周向方向分配不均匀;然后,阐明了冷却系统的作用本质是降低耐火材料热面温度,并提出了高炉冷却强度指数及高炉冷却效率指数;最后,分析了采用无钛矿护炉和钛矿护炉两种模式的高炉炉缸维护技术。 相似文献
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以太钢新建4 350m3高炉为例,论述了为实现高炉炉缸炉底的长寿,从高炉的设计、选材和砌筑等方面采取的一系列措施。炉缸设计采用"传热法",炉底设计采用"隔热法",炉缸炉底整体设计采用了"扬冷避热梯度布砖法"。炉缸选材使用优质高导热系数的碳砖,为了克服冷却壁与碳砖之间捣打料带来较大热阻,砌筑过程中碳砖采用顶砌冷却壁方式,并且严格控制砖衬宽度;炉壳与冷却壁采用分段灌浆。通过建立炉缸炉底传热数学模型,进一步表明了该高炉炉缸炉底优良的性能,投产后1 150℃等温线位于炉缸砖衬热面附近,有利于渣铁壳的形成;同时碳砖内部温度普遍低于750℃,温度梯度较小,碳砖脆化及热应力对砖衬的破坏作用较轻,为日后实现长寿炉缸炉底创造了必要的条件。 相似文献
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武钢1号高炉炉底与炉缸长寿新技术 总被引:4,自引:0,他引:4
武钢1号高炉改造性大修,炉底与炉缸采用长寿新技术:增大炉缸容积,加深死铁层;选用半石墨炭砖和德国的高密质炭砖;炉底冷却采用软水密闭循环,以及设置完善的检测设施。总结运用钒钛矿护护经验,以减缓或消除炉底与炉缸“环缝”、“熔洞”、“蒜头状”侵蚀,达到炉底、炉缸高校长寿的目的。 相似文献
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ZHAO Hong-bo CHENG Shu-sen ZHAO Min-ge 《钢铁研究学报(英文版)》2007,14(2):6-12
One of the bottlenecks of the blast furnace (BF) campaign is the life length of hearth bottom. The basic reason for the erosion of hearth bottom is its direct contact with hot metal. According to the theory of heat transfer, models of BF hearth bottom are built based on the actual examples using software and VC language, and the calculated results are in good agreement with the data of BF dissection after blowing out. The temperature distribution and the capability of the resistance to erosion for different structures of hearth bottom are analyzed, especially the two prevalent kinds of hearth bottom arrangements called "the method of heat transfer" for all-carbon brick bottom and "the method of heat isolation" for ceramic synthetic hearth bottom. Features of the two kinds of hearth bottoms are analyzed. Also the different ways of protecting the hearth bottom are clarified, according to some actual examples. After that, the same essence of prolonging life, and the fact that the existence of a "protective skull" with low thermal conductivity between the hot metal and brick layers is of utmost importance are shown. 相似文献
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All investigations made in the course of the present inquiry aimed at developing proposals for the optimisation of blast furnace bottom and hearth refractories by means of experimental tests. Furthermore, the tests are intended to develop new solutions for prolongation campaign life of blast furnace linings by applying the finite-element method. In the model calculations, particularly those bricks having a high thermal conductivity, showed high resistance to crack and spall formation. In comparison to standard or microporous grades, graphite containing carbon blocks lower the risk of tensile cracks. By additionally doping graphite containing grades with aluminium oxide and silicon, high resistance against pig iron dissolution and infiltration can be reached. Metallurgical coke content proved disadvantageous in the brick, because due to its high porosity the content can be infiltrated additionally into the porous binding matrix. Reduced flow in the brickwork and, thus, reduced convective heat transfer lead to reduced tensile levels in the brickwork. By adapting the pool depth and tap hole length, particularly the linings in the bottom and tap hole area will be relieved thermically. In addition to the required stability of coke particle size and its large particle diameter to ensure an equally distributed pig iron flow through the dead man, the dead man should also have good carburization capacities. When comparing the dissolving inclination by temperature reduction at the internal hearth wall side to the doping influence, it becomes clear that wear can be reduced much more efficiently by adding aluminium oxide than by increasing cooling measures. 相似文献
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摘要:为延长高炉的使用寿命和掌握炉缸砖衬的侵蚀机制,结合绘制的炉缸侵蚀炉型图,并借助扫描电镜、EDS电子探针和X射线衍射仪等手段分析炉缸炭砖的形貌、元素和物相。研究表明:炉缸炭砖表面上有明显的白色絮状物,且炭砖表面出现疏松和粉化的现象,导致炭砖出现裂缝,加快炭砖侵蚀;富集在炭砖热面的钛化物起到了保护衬作用,使有害元素难以存在受铁水冲刷程度严重的炭砖表面;21号~22号风口和相对应的8号~9号风口正上方对应着热风围管与送风支管连结的三岔口位置,侵蚀最严重;炉缸中锌与一氧化碳以及炭砖中的硅氧化物等物质反应生成氧化锌、硅锌矿和石墨等物质,并透过炭砖的气孔和通缝等逐渐渗入炭砖内部,致使炭砖体积发生膨胀,从而导致炉衬侵蚀。 相似文献
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高炉炉缸环缝成因探讨 总被引:1,自引:0,他引:1
通过对武钢1号高炉1999年10月大修破损调查研究,发现炉缸碳砖破损状况与过去报导的有所不同。在高碱度负荷下,该高炉炉中位产生了平行于炉的至上而下的三条环裂。利用所得测试数据探讨了三条环裂的形成机理。 相似文献