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我国高炉炉料结构的进步 总被引:2,自引:0,他引:2
对我国高炉普遍采用的几种主要炉料结构形式(如高碱度烧结矿搭配酸性球团矿、高碱度小球烧结矿配加酸性球团矿、高碱度烧结矿配加酸性烧结矿等)进行了分析,并对合理炉料结构的原则进行了阐述。 相似文献
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一、前言 七十年代以来,各国炼铁工作者开始重视高碱度烧结矿的应用和高炉合理炉料结构的选择。日本高炉炉料中高碱度烧结矿的比例自后逐年有所增加,块矿和酸性球团矿的配比约各占10~20%;苏联一向以烧结矿为主,使用球团矿的比例极低、七十年代以来,不少高炉也开始采用球团矿作为炉料的一部分,目前炉料中球团矿一般已占20~30%;西德高炉的炉料以烧结矿为主,使用酸性球团矿的比例也在20~30%;美国高炉 相似文献
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鉴于环保压力的影响,高炉应减少烧结矿的使用,多使用相对清洁的球团矿和块矿进行高炉冶炼。为配合酸性炉料的大比例加入,需要提高烧结矿的碱度。然而,随着烧结矿碱度的提高,高炉炉内压差升高,透气性恶化,高炉相应生产质量指标难以提升。为了避免烧结矿碱度过高所带来的问题,提出了新的技术思路,即将烧结矿中碱性熔剂取出直接加入高炉,选择适宜的球团矿种类、适宜碱度的烧结矿配加一定量的石灰石与一定比例块矿组成高炉炉料结构。研究结果表明,与综合炉料中直接加入碱度为2.3的烧结矿相比,外配石灰石的方式所组成的综合炉料熔滴性能更优,炉料透气性得到了改善。在熔滴性能满足高炉要求的情况下,通过外配石灰石的方式,炉料结构中烧结矿比例可以降低至47%左右。 相似文献
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本文对比了两种不同炉料结构,一种为46.83%酸性球团矿及53.17%高碱度烧结矿的综合炉料,另一种为单一的自熔性烧结矿;分析了它们的全炉物料及热平衡,并进行了两种条件下的Rist操作线分析,获得了高炉使用综合炉料的冶炼效果比单一的炉料结构优越的结果.通过对原料冶金性能的测定,发现杭钢酸性球团及高碱度烧结矿具有较高的强度及还原性,较低的还原粉化率以及粒度整齐的特点,特别是酸性球团矿还具有低膨胀率的特点.文中指出其高温还原性能及软化温度有待改进,并提出了如何改进的办法. 相似文献
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我国高炉合理炉料结构探讨 总被引:7,自引:0,他引:7
根据我国各钢铁厂的不同情况和不同矿源分析了高炉的合理炉料结构。认为有自产铁精矿的钢铁厂的高炉合理炉料结构应该是高碱度烧结矿加球团矿,所需球团矿应该用自产铁精矿来生产;主要吃进口铁矿的钢铁厂的高炉炉料结构应该是高碱度烧结矿加块矿(或再加球团矿);独立矿山所产铁精矿应该加工成氧化球团矿,以满足国内高炉对酸性炉料的需要,这样做对矿山和钢铁厂都有利。 相似文献
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《钢铁研究学报(英文版)》2016,(8):765-771
Mathematical models for burden descending process have been applied to obtain whole burden structures in blast furnace,whereas the accuracy of those burden descent models has not been sufficiently investigated.Special evaluation method based on timeline burden profiles was established to quantitatively evaluate the error between ex-perimental and modeled burden structures.Four existing burden descent models were utilized to describe the burden structure of a 1/20 scaled warm blast furnace.Input modeling conditions including initial burden profile,descending volumes in each time interval,and normalized descending velocity distribution were determined via special image pro-cessing technology.Modeled burden structures were evaluated combined with the published experimental data.It is found that all the models caught the main profile of the burden structure.Furthermore,the improved nonuniform de-scent model (Model IV)shows the highest level of precision especially when burden descends with unstable velocity distribution tendency.Meanwhile,the traditional nonuniform descent model (Model III)may also be desirable to model the burden descending process when the burden descending velocity presents a linear tendency.Finally,the uni-form descent model (Model I)might be the first option for roughly predicting burden structure. 相似文献
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高炉炉料结构的研究及其优化配料数学模型的建立 总被引:1,自引:0,他引:1
以高炉炼铁工艺计算和高炉炉料结构理论为基础,结合在炉料结构方面的最新科研成果,建立一套高炉优化配料模型,并利用软件技术开发了相应的炉料数据库、专家数据库及其优化配料的数学模型,对宝钢高炉的配料数据进行验算,结果表明建立的模型是合理可行的.该模型能够快速得到满足其约束条件的优化配料方案,优化后配料方案的吨铁成本比实际生产采用的配料方案降低0.44%. 相似文献
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The mechanism by which the burden moves in a submerged-arc furnace was investigated in two large industrial furnaces by the
stimulus-response technique with a radiotracer input of the radioisotope 59/26Fe as the stimulus. This radioisotope was suitable
only for the measurement of residence-time distributions in the alloy phase and the analysis of the experiments was limited
to that phase. A composite model to describe the movement of the burden through the furnace was developed by consideration
of the mechanism and position of heat generation within the furnace, the inner structure of the furnace, the general form
of the measured residence-time distributions, and the mode of burden descent through the furnace. The composite model consisted
of a dispersed plug-flow region in the upper regions of the furnace discharging into a constantly stirred tank reactor beneath
the electrode tips. Nonlinear regression analysis of the equations developed from the composite model permitted the selection
of optimum values of model parameters to give computed curves that approximated to the residence-time distributions. Since
the computed results gave realistic values of the model parameters, it was concluded that the model was a valid representation
of burden movement through the furnaces. The role of factors such as the position of the radiotracer addition, the energy
input to the furnace, the mode of heat distribution in the furnace, and variations in the feed rate of raw materials was analyzed
in an attempt to describe the influence of furnace operating conditions on the values of the model parameters.
G. J. DYASON, formerly a Graduate Student in the Department of Metallurgy, University of the Witwatersrand, Johannesburg,
South Africa.
J. B. SEE, formerly Research Group Leader, Pyrometallurgy Research Group, National Institute for Metallurgy, Johannesburg,
South Africa. 相似文献