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实验研究表明,高炉矿焦混装配加球团,同样可以改善块状带气体力学特性,改善高温软熔性能。高炉料配加球团时,混装改善了料柱的高温还原,可减轻球团自身高温性能不良的影响。包钢炉料球团配比在20~40%时,混装效果更好。 相似文献
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焦炭质量是高炉生产操作取得良好指标的关键,使用高反应性焦炭能增强炉内的还原气氛,促进含铁炉料的还原,而料层透气性不会有显著变化。此外,焦炭反应性的提高有利于提高含铁炉料进入软熔带和滴落带时的金属化率,减少进入软熔带和滴落带炉料中FeO的含量,有利于改善高炉内含铁炉料的软熔滴落性能。 相似文献
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在掌握金属化球团及其他含铁原料特性的基础上,采用熔滴试验方法,考察不同比例金属化球团对高炉冶炼过程的影响。试验结果表明:金属化球团具有含铁品位高、金属化率高、还原性能好、无低温还原粉化、软熔滴落性优良等特点,在高炉中配加金属化球团其综合炉料的软熔滴落性能变好,但考虑到配加金属化球团后减少焦比对高炉的影响,其配加比例在20%(质量分数)左右比较适宜。 相似文献
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为提高高炉冶炼钒钛磁铁矿水平,系统研究了矿焦混装对高炉综合炉料软熔滴落性能和V、Cr在渣铁中迁移规律的影响,并进行了理论分析。试验过程中烧结矿和球团矿所占比例不变。研究表明,矿焦混装对高炉综合炉料的软化区间、熔化区间、滴落率和透气性等软熔滴落性能参数有显著影响。随着混装率提高,软化区间[t40-t4]稍微变宽;熔化区间[tD-tS]逐渐变窄,软熔带变薄且位置下移;熔滴性能总特征值明显减小,综合炉料透气性能显著改善;渣铁滴落率先增加后减少;V、Cr在初铁中的收得率先升高后降低。因此,一定程度的矿焦混装有利于改善钒钛磁铁矿高炉冶炼综合炉料的软熔滴落性能,其混装率以25%为宜。 相似文献
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利用高温熔滴炉模拟实际高炉软熔带的运行情况,探讨CaF2和MgO加入炉料后,对钒钛高炉炉料透气性、软熔带厚度、压差陡升温度、软熔区间、熔融区间等炉料高温物理性能的影响;为改善软熔带透气性,找出高炉合适软熔带位置,从而达到解决利用钒钛磁铁矿带来的不利影响的目的,为提高高炉强化冶炼目的提供重要依据。结果表明:炉料中添加萤石后对软化开始温度基本无明显影响,但使软化温度区间变窄,初渣带位置形成过早,软熔带厚度、最大压差、总特性值都升高。MgO的加入使软化开始温度升高,软化温度区间变窄,说明MgO的加入使软熔带位置下移,软熔带变薄。 相似文献
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铁焦与铁矿石混装对高炉初渣形成的影响 总被引:2,自引:0,他引:2
软熔带的形状和位置是影响高炉稳定运行的关键因素之一。研究了综合炉料中混入高反应性铁焦对高炉初成渣形成过程的影响。针对综合炉料进行研究,结果表明,铁焦的加入导致试样的变形开始温度降低,这是由于在较低温度下铁焦即开始与CO2反应,增加了煤气中的CO浓度与平衡浓度的差值,加速了铁矿石的间接还原。铁焦的加入一般使软化结束温度升高、滴落温度下降,使得软熔区间大幅度收窄,表明向铁矿石中混入铁焦能够显著改善高炉料柱的透气性。加入铁焦还使滴落熔铁中的碳含量明显提高。优先考虑对料柱透气性的影响,建议使用加入20%(质量分数)矿粉A的铁焦。 相似文献
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高炉内软熔带区域的透气性是影响高炉稳定顺行的重要因素,并由炉料的软化融化特性决定.当炉料内部发生软化融化时,炉料内对气体的粘性阻力系数及内部惯性阻力系数发生巨大变化,从而导致透气性变差,内部最大压差增大.本研究旨在通过预还原实验及软化融化实验,探明混合料的还原度对软熔带的透气性影响.结果表明:在不同软融阶段,同一还原度混合料层的最大压差明显不同,当料层温度进入融化区时,粘性阻力系数突增导致压差突然上升.由于惯性阻力系数的变化,压差曲线在达到融化温度之后还会继续发生波动.还原度较低时会出现二次压差峰值,随着还原度增加,二次峰值现象减弱.当还原度达到90%时,二次峰值消失,最大压差曲线在融化开始温度后逐步下降.试验结果对提高软熔带透气性,保证高炉内部稳定顺行具有重要的指导意义. 相似文献
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结合安钢实际,提出了降低生铁成本的建议:1)实施烧结矿喷洒氯化钙溶液技术,以降低烧结矿的还原粉化率;2)采用高碱度烧结矿加酸性球团矿加少量块矿的合理炉料结构;3)发挥高压操作的作用;4)改善炉渣理化性能,实现低硅铁冶炼;5)使用焦丁并改善焦炭质量。由于采取这些措施,安钢降低吨铁成本17元,焦比降至330 kg/t。 相似文献
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The iron ore consumption doubled several times due to the rapid development of ironmaking industry in China, resulting in the worse quality of iron ores in the past decade. Therefore, the efficient utilisation of poor quality iron ore resources is of great importance for the sustainable development of ironmaking industry. In this work, a new method for optimisation of blast furnace burdens was studied based on the primary slag formation behaviour because it has significant influence on the formation of the cohesive zone. The results showed that there was obvious interaction between sinter and acid iron ores at high temperature, and the primary slag formation behaviour was clearly improved by the high temperature interaction. The poor quality lump ore could be utilised together with high basicity sinter and self-fluxed pellet to enhance the high temperature interaction. Besides, increasing CaO and MgO content in blast furnace burdens would further improve their primary slag formation behaviour and the performance of cohesive zone. 相似文献
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为实现低碳炼铁生产,首钢基于秘鲁矿粉资源高品位低硅含量的特点,确定了高炉高球团比例冶炼的技术路线。依据炉渣碱度平衡、球团性能和炉料结构软熔性能试验研究,开发出35%碱性球团矿 + 20%酸性球团矿+ 40%烧结矿 + 5%块矿的高炉基础炉料结构。根据高比例球团矿同时抑制边缘和中心的特性,通过料序控制减少球团在边缘与中心的分布,实现酸碱性炉料的均匀混合,并采用中心加焦布料方式开放中心、适当疏导边缘,以稳定煤气分布。在活跃炉缸基础上,通过高富氧高顶压控制炉腹煤气指数来降低压差提高冶炼强度。低渣比下通过提高镁铝比至0.60~0.65来改善脱硫排碱能力。55%球团比例下高炉实现了高效稳定顺行,平均利用系数达到2.3 t/(m3·d),渣比低于220 kg/t,燃料比降至480 kg/t,炼铁系统碳排放降低8.6%。 相似文献
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为全面掌握鞍钢的烧结矿碱度、天然块矿配加比例和不同炉料结构的软熔特性,得到可评价炉料结构的方法,通过实验室试验,系统研究了不同碱度烧结矿的冶金性能,不同碱度烧结矿与球团矿搭配、烧结矿与球团矿和天然块矿搭配的复合炉料结构高温特性。结果表明,随碱度提高,矿物组成渐趋合理,烧结矿的还原和粉化指标改善,在碱度为1.90~2.05时,单一烧结矿的软化熔融性能较好;在碱度为1.95~2.15时,透气性较好;当烧结矿与球团矿搭配,碱度为1.90~2.15时,软熔区间窄,[S]特性值低;在配加天然块矿后,复合炉料的软化区间变宽,熔融区间变窄,综合性能得到改善。基于研究结果,提出了适合鞍钢原料条件的炉料间交互反应性的评价指数,通过指数判断,高炉天然块矿的适宜配加比例为15%~20%。 相似文献
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Yanling Guo Wanren Xu Jinming Zhu Jieyu Zhang 《Metallurgical and Materials Transactions B》2013,44(5):1078-1085
A major advancement in the Corex ironmaking process is the usage of lump coal considering the shortage of coking coal resources worldwide. However, the burden similar to that of the blast furnace is still essential for the enlarged melter gasifier. The notable difference is that the burden of the melter gasifier is composed of char formed from lump coal with a small amount of coke. The burden structure of the melter gasifier was investigated by the tuyere probing while the plant was shut down at different operating conditions. The specimens representing the different positions of lump zone, cohesive zone, and dripping zone were analyzed by means of coke/char size distribution and X-ray diffraction (XRD) for the degree of graphitization of coke. A chemical analysis of metal composition has also been performed to get a better understanding of the final reduction in the melter gasifier. The burden structure is supposed to be divided into three zones: active zone, outer of deadman, and deadman core, where coke/char was consumed differently. Based on these analyses, some technical advice to improve the Corex operation is given. 相似文献
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A novel blast furnace operation of coke oven gas (COG) injection simultaneously with hot burden charging has been proposed to solve the problem of insufficient heat in the BF shaft zone under the condition of COG injection and make full use of the abundant sensible heat of high temperature burden. In this paper, the novel process has been simulated with a multifluid blast furnace model. The results show that, in comparison with the operation of COG injection only, under the operation of COG injection together with hot burden charging, the temperature in the upper zone of the shaft increases while that in lower zone decreases. Furthermore, the reduction of iron bearing material is improved in the top zone, and the cohesive zone tends to descend and narrow. The coke ratio, fuel ratio and CO2 emissions of the operation of charging hot pellet and coke with the temperature of 800°C are decreased by 4.0, 4.7 and 5.3% respectively, while the hot metal productivity is increased by 7.14%. Therefore, COG injection combined with hot burden charging operation not only increases temperature in the upper part of the blast furnace but also decreases energy consumption per tonne hot metal. 相似文献
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某企业2 680 m3高炉炉料结构为“75%高碱度厂烧+7%酸性外球+18%天然块矿”,为了降低高炉原料成本,选取不同非主流块矿与当前高炉使用的主流P块、N块进行了多种冶金性能检测,结果证明R块相较于P块、N块,矿石结构紧密,具有较好的抗热裂性能,同时还兼顾较高的还原性能。综合炉料的熔滴特性表明,配加R块后,料柱的软融区间降低25 ℃,但由于R块高铝的属性,导致渣系中极易形成高熔点渣相,降低炉渣流动性,料柱最大压差ΔPmax增加4.6 kPa。实际生产中,2 680 m3高炉配加R块后,仍可以实现稳产顺行并取得了较好的经济效益。 相似文献