共查询到19条相似文献,搜索用时 140 毫秒
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淮钢3号高炉第二代炉役寿命9年零2个月,单位炉容产铁量1.3247万t/m3.大修停炉时进行的炉缸破损调查发现:炉缸陶瓷杯壁被侵蚀干净,并已侵蚀至炉缸环炭;炉缸呈象脚状侵蚀,象脚区域侵蚀严重,最薄位置炭砖仅剩80 mm;炉底侵蚀较轻,2层陶瓷垫仍有1层保存完好.大修时采取炉缸整体浇注方式进行快速修复,并采用全风口+带风... 相似文献
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首钢迁钢2号高炉开炉2年后炉缸便发生水温差异常升高现象,长期被迫加钛护炉,控制冶炼强度。研究炭砖的侵蚀是探索炉缸侵蚀的关键。通过化学成分分析、SEM和EDS等手段,研究2号高炉炉缸炭砖异常侵蚀状态和机理。结果表明,13号风口下方象脚区炭砖主要受铁、钾、硫等侵蚀,其中铁的侵蚀深度最深;20号风口下方象脚区炭砖除受铁、钾和硫侵蚀外,受锌侵蚀也较为严重,但锌的侵蚀深度小于铁、钾和硫的侵蚀深度;出铁口区炭砖主要受锌和硫侵蚀,该区炭砖附近存在串气现象,炭砖表层有裂纹,裂纹处主要为锌和硫。炭砖芯部存在混料不均现象,其将导致碳砖随着炉缸温度和压力的变化而产生裂纹。 相似文献
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为了明确浇注型炉缸的侵蚀特征与侵蚀机理,对国内1座2 600 m3浇注型高炉炉缸侵蚀形貌及侵蚀原因进行了研究。通过破损调查的方式,对停炉后的浇注炉缸进行测量与取样。破损调查过程中炉缸拆除采用逐层拆除方式,拆除过程中对炉缸侧壁浇注料残厚进行了人工测量;在炉缸浇注料与炭砖的结合区域发现了浇注料脆化现象,对浇注料脆化层进行了测量取样;炉缸热面浇注料中发现了明显的渗铁侵蚀现象,使用电镜、XRD等检测手段对服役后浇注料进行研究,明晰了高炉浇注型炉缸的侵蚀原因。研究表明,炉缸侧壁浇注料侵蚀严重的位置位于1号、2号铁口方位,高度上集中在铁口下0.5~1.5 m,其中1号铁口方位17、18层炭砖对应高度的浇注料残厚最小,为180 mm。在浇注料与炭砖界面处发现50~180 mm厚的脆化层,铁口方位的浇注料脆化层平均厚度小于非铁口区域脆化层平均厚度。电镜观察结果表明,炉缸浇注料热面侵蚀的主要原因为高温渣铁渗透侵蚀,浇注料脆化层的形成是高温物相转变、有害元素侵蚀等因素综合作用的结果。浇注型炉缸侧壁脆化层的产生,使得炉缸侧壁浇注料与炭砖结合区域出现气隙,破坏了炉缸的传热体系,使得炉缸浇... 相似文献
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高炉风口喂钛线是维护炉缸局部侵蚀部位的措施之一.采用数值模拟方法分析了喂钛线后炉缸铁水中钛化物的迁移规律,讨论了喂入位置对护炉效果的影响.计算结果表明:不同喂入位置条件下,钛化物的迁移路径和分布相差很大.当风口喂入位置距铁口较远时,钛化物在炉缸侧壁、炉缸底面上均有分布,有利于维护对应位置的炉缸侧壁、炉底侵蚀区域;喂线位置距铁口较近时,可维护炉缸侧壁区域,较难保护炉底部位.由此可见,应综合考虑侵蚀部位、铁口位置特点,选择最佳喂线护炉位置.模拟结果为生产实践所验证,表明数值模拟方法可作为选择护炉方式、优化喂线位置的参考依据. 相似文献
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炉缸的运行状况对高炉长寿起着决定性作用。首钢京唐2号高炉2017年8月开始炉缸侧壁温度急剧上升,对高炉的正常生产和人员安全提出了严峻考验。炉缸侧壁高温点的位置坐标表明,首钢京唐2号高炉炉缸侧壁温度异常升高的直接原因是炉缸内部铁水环流加剧对炉缸内衬的化学侵蚀和物理冲刷。进一步从铁水成分、炉底温度、铁口深度和铁水流速等因素分析,证实了2号高炉炉缸侧壁温度升高的根源在于炉缸活跃性恶化。此外,较高的硫负荷和焦炭灰分、较低的终渣碱度及水箱漏水等因素也在一定程度上促成了炉缸不活的状态。 相似文献
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To prolong the campaign life of the furnace hearth for high demand in the steel market, the theme of preventing the hearth wall from erosion phenomenon is worthily studied for steel industry. The titanium carbide (TiC) concentration distributions in the blast furnace hearth can be used to suppress the erosion phenomenon of the hearth wall. In this work, we solve the momentum and the thermal‐energy‐balance equations, as well as the mass transfer equation with chemical reaction effects to investigate the TiC concentration profiles in the hearth of Port Kembla no. 5 blast furnace (PKBF5) by means of a computational fluid dynamics (CFD) package, Fluent (version 6.2). As shown in the results, the elephant foot erosion and pot‐like erosion in the hearth may be restrained based on the calculated TiC concentration distributions. Additionally, this work illustrates that deadman type may be inferred based on the calculated TiC concentration profiles when the blast furnace is revamped. 相似文献
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�ƺƣ�����ƽ���� 《钢铁研究学报》2013,25(10):1-4
The key of restricting blast furnace long campaign was in hearth area. Circuiting flow of hot metal was one of reasons for the elephant foot type erosion in hearth. The effects of dead-man state (sinking or floating) on flowing hot metal in hearth were investigated. The suitable salamander depths of blast furnaces were introduced through using experimental model, theoretical analysis, anatomical investigations and data regression. Three different points are summarized: salamander depth with the ratio of hearth diameter is greater than 25%, or between 22% and 25%, or between 15% and 20%. It points out deepening the salamander depth is helpful for alleviating circuiting flow of hot metal and preventing elephant foot type erosion in hearth. 相似文献
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Bao-Yu Guo Paul Zulli Daniel Maldonado Ai-Bing Yu 《Metallurgical and Materials Transactions B》2010,41(4):876-885
The erosion of hearth refractory is a major limitation to the campaign life of a blast furnace. Titanium from titania addition
in the burden or tuyere injection can react with carbon and nitrogen in molten pig iron to form titanium carbonitride, giving
the so-called titanium-rich scaffold or buildup on the hearth surface, to protect the hearth from subsequent erosion. In the
current article, a mathematical model based on computational fluid dynamics is proposed to simulate the behavior of solid
particles in the liquid iron. The model considers the fluid/solid particle flow through a packed bed, conjugated heat transfer,
species transport, and thermodynamic of key chemical reactions. A region of high solid concentration is predicted at the hearth
bottom surface. Regions of solid formation and dissolution can be identified, which depend on the local temperature and chemical
equilibrium. The sensitivity to the key model parameters for the solid phase is analyzed. The model provides an insight into
the fundamental mechanism of solid particle formation, and it may form a basic model for subsequent development to study the
formation of titanium scaffold in the blast furnace hearth. 相似文献