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马钢二铁厂3号高炉(有效容积294m~3),自1985年6月至今所进行的矿石与焦丁混装入炉的生产实践,证明它对改善料柱透气性,提高煤气利用、降低焦比有积极意义。1985年9月这种混装焦丁的操作方法又扩大应用到2号高炉(294m~3)和1号高炉(255m~3),均取得满意效果。截至1986年3月底止,全厂共加入焦丁6025t(折合干焦丁4957t)。矿石与焦丁混装已成为二铁厂高炉的正常操作方法,是1986年降低焦比、增加经济效益的措施之一。 相似文献
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以鞍钢1800~2580米~3大型高炉为对象,探讨强化冶炼过程的条件及问题。精料是强化冶炼过程的基础,它可以保证高炉料柱有良好的透气性以保证顺行,同时又可以降低燃料比。鞍钢七高炉入炉矿石铁分由50%提高到56%,渣铁比由700公斤/吨降到426公斤/吨,但其校正燃料比并未相应降低。计算了七高炉1978年5月和12月的校正燃料比和鞍钢七高炉和日本和歌山高炉校正燃料比都说明如此。问题在于鞍钢烧结矿含粉率高达16~18%,而日本和歌山高炉不大于5%,以及鞍钢大型高炉在强化条件下其炉 相似文献
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The charging pattern may affect blast furnace permeability,coke ratio,and the freedom to select low-grade raw materials. Ore-coke mixed charging is a potential technique for optimizing the charging pattern. In recent years,charging small-sized coke( nut coke) into the burden layer has been applied to save raw materials and decrease cost.Although mixed charging,especially adding nut coke into the burden layer,may have many advantages,the mechanisms and side effects of nut coke use are not well understood,and the mixing ratio is still limited in industrial blast furnace operation. In this study,the status of mixed charging,especially nut coke used in blast furnaces,was investigated. A cold flow model was established to study the permeability of the packed bed in the blast furnace "dry zone"under different conditions with the aim of better understanding the mechanisms of mixing coke and nut coke into the burden layer. The effect of coke size,mixing coke ratio,layer numbers,and gas flow rate on the pressure drop of the packed bed was investigated. The experimental results show that mixing the nut coke in the ore layers decreases the pressure drop to different extents depending on mixing ratio. 相似文献
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中心加焦可以减小中心区域的矿焦比,增加中心气流强度,形成倒V形软熔带,提高料柱的透气性;由于中心气流中CO含量高,焦炭的溶损少,颗粒进入炉缸时保持较大的粒度,提高死焦堆的透气透液性。中心加焦对高炉操作有很多积极作用,但中心加焦也会减小中心气流的利用率,提高燃料比。当中心加焦过量时,高炉内的气流分布出现异常,因此需要研究合理的中心加焦量以及中心加焦方式。利用Ergun公式,对不同中心加焦量条件下,高炉内的煤气分布、压差变化等参数进行计算,并根据煤气分布情况简单计算了中心加焦对高炉内煤气利用率的影响。根据计算分析结果,对高炉中心加焦量及中心加焦方式进行讨论。研究结果可以为实际高炉中心加焦操作提供理论参考。 相似文献
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风口焦炭取样研究对高炉操作的指导 总被引:1,自引:0,他引:1
根据首钢4号高炉风口焦炭取样的数据,分析了回旋区焦炭带的长度与实际风速、风口焦炭粒度及焦炭质量的关系,探讨了煤比与渣量及回旋区焦炭带的长度的关系;探索了高炉透气性指数与实际风速、煤比、风口焦炭粒度及高炉布料制度之间的关系。通过对炉缸径向煤气压差分析对高炉焦炭负荷、上下部制度的合理调整提出了建议。相关建议实施后,高炉技术经济指标明显改善。 相似文献
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Reasonable control on CRI (coke reaction index) is one of the key factors for BF (blast furnace) low-carbon smelting. However, there are contrary opinions. One is increasing CRI to improve reaction efficiency in BF and the other is decreasing CRI to suppress coke degradation in furnace. Different methods are adopted to realize effective catalysis (increasing CRI) and passivation (decreasing CRI) of coke. Simulation tests of coke in BF lumpy zone under gradual temperature rising have been done. Effect of CRI on gas composition, ore reduction, burden column permeability and heat reserve zone′s temperature under non-isothermal condition are studied. Then combined with iron making calculations, a novel BF operation suggestion is proposed as coke nut with small size be catalyzed and mixed with ore while skeletal coke with large size be passivated and separately charged into BF. 相似文献