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通过分析2号高炉炉况顺行差、经济技术指标不好的原因,决定采用蒸汽加湿鼓风技术。并针对以前加湿操作的不足之处,做了改进和完善。运行实践证明:此项技术使炉况顺行改善,并获得增产、节焦和铁水质量提高的良好效果。 相似文献
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通过分析镀锌产品锌灰形成的原因,提出采用炉鼻内加湿的方式,开发一套炉鼻加湿气体装置,并对现有炉鼻进行改造,从而减少锌灰,提高镀锌产品质量。 相似文献
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为了研究不同鼓风条件下块矿比例对高炉含铁炉料软熔性能的影响,计算模拟了3种鼓风条件下的温度和气体含量并使用高温熔滴炉研究了块矿比例对含铁炉料软熔性能的影响,进而进行综合炉料结构优化的分析。结果表明,富氧、加湿鼓风条件下,氢气含量增加,能有效降低炉内最大压差,窄化熔融区间,改善炉内透气性;富氧、加湿鼓风条件下,块矿比例的增加虽然会导致炉内最大压差和软熔区间的增大,但是最大压差的绝对值仍远小于基准条件下的最大压差值,软熔带宽度也小于基准条件下的宽度。可以得知,在富氧和加湿鼓风条件下适当增加块矿比例,综合炉料软熔性能仍然优于基准条件,且能降低高炉生产成本,对于炉料结构是一种有效的优化措施。 相似文献
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李献琥 《金属材料与冶金工程》1988,(4)
由于设备和技术的进步,高炉冶炼的风温可提高到1000℃以上,这就给推行和发展高湿分冶炼技术创造了条件。回顾50年代的高炉操作普遍采用加湿鼓风,促进了炉况的稳定和顺行。但因当时风 相似文献
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安钢300m^3高炉在全焦冶炼条件下,采用富氧(富氧率-1%)、加湿(湿度--24g/m^3)综合鼓风技术,促使高炉顺行,有利于提高冶炼强度和实现全风温操作(风温-1000℃),并增加了特殊炉况的调节手段。 相似文献
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烧结机炉篦条糊堵现象比较常见,九江萍钢钢铁有限公司(以下简称九钢)在对比分析炉篦条糊堵现象前后的工艺变化后,对比分析其糊堵的机理,采用降低水分减少过湿层,对除尘灰均匀使用并加湿使用,最终缓解了烧结机炉篦条糊堵现象。 相似文献
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新钢公司7号高炉原燃料条件较差,成份波动大,炉温、碱度不易控制,炉况不稳,。采用加湿鼓风工艺,对稳定炉温和炉况起了一定作用,生产指标有所改善。 相似文献
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为了降低京唐高炉燃料消耗,通过对Rist操作线的意义进行阐述,以京唐1号高炉生产参数为依据,计算并绘制了Rist操作线,据此分析了煤气利用率、风温、生铁含碳、金属化率等高炉操作参数改变对燃料比的影响。针对这些影响因素,京唐1号高炉对降低燃料比进行了一系列攻关工作,通过采取强化原燃料管理,提高原燃料质量,为降低燃料消耗创造条件。优化高炉操作,降低热风炉拱顶温度,对热风管系进行改造,提高送风系统的安全性,尽可能提高风温水平;优化装料制度,获得较高的煤气利用率;高风温、富氧,稳定均匀喷吹以提高煤粉置换比。通过对生产攻关实践,首钢京唐1号高炉实现了低燃料比生产,达到490kg/t。 相似文献
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RJ Irwin MR Lerner JF Bealer SA Lightfoot DJ Brackett DW Tuggle 《Canadian Metallurgical Quarterly》1998,91(7):387-392
Blast wave injury from bombs cause a unique but poorly understood spectrum of injuries. Previous blast wave models involved high energy explosives detonated in an open field without the sophisticated monitoring of laboratory equipment. We characterized a rodent model that produces a global blast injury in a safe laboratory environment. Male rats, prospectively randomized to four groups of ten, were anesthetized and subjected to a blast at 2.0 cm, 2.5 cm, or 3.5 cm from the blast nozzle. The control group received no blast. Intensity of the blast (80-120 psi peak pressure, 1-2 msec duration) was controlled by varying the distance of the blast wave generator to the rat. The rats were monitored for three hours following the blast and then euthanized. Bradycardia was an immediate but transient response to blast injury. Mean arterial pressure was bimodal with severe hypotension occurring immediately after the blast and, again, two to three hours later. The characteristic injuries from a blast wave, such as pulmonary hemorrhage with increased lung weight, intestinal serosal hemorrhage, and hemoperitoneum, were found in the rats subjected to the blast pressure wave. In conclusion, our rodent model accurately reproduces the clinical spectrum of injuries seen in blast victims and will provide a powerful tool for studying the pathophysiology and potential treatments of bomb blast victims. 相似文献
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高炉操作炉型与高炉操作、技术经济指标等关系密切,合理的操作炉型有利于保证高炉生产的优质、低耗、高产、长寿.通过对冷却壁温度的聚类分析,能够有效合理地表征高炉操作炉型的变化,对高炉生产有着重要的指导意义.分别采用K-Means、TwoStep对数据集进行聚类分析,基于两种聚类算法的原理,结合Davies-Bouldin index(DBI)与Dunn index(DI)对聚类结果进行评价,分析不同聚类算法间的差异,得出了在所选样本数据及数据特征基础上,K-Means算法聚类结果更好的结论,该研究可为高炉炼铁大数据分析中的聚类算法选择提供有力参考. 相似文献
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This paper presents simulative tests in a continuous hot model of the lumpish zone in a blast furnace. Samples after reaction were analysed in compression tests and a relationship between reaction degree and temperature in a blast furnace was derived. Compression strengths of coke, pellets and sinter with different reaction degrees were measured at relevant temperatures using a high temperature compression testing machine with adjustable atmosphere. Based on the results, the regulation of strength variability and the mechanism of breakage of raw materials in blast furnaces were researched. As an effect of the increases of temperature and carbon loss rate, the strength of coke had a negative linear relationship with the temperature in the indirect reduction zone in a blast furnace. The carbon loss rate of coke in the stock column of a blast furnace is about 36% and the strength can be decreased by more than 90%. A practical way to save coke strength is to reduce the carbon loss rate. The strength of pellets was decreased by about 60% to 70% in the lumpish zone. If the original strength of pellets was higher than 2000 N, the high temperature strength roughly kept at a coordinative level over 1000 N and was sufficient to avoid damage in the blast furnace. Due to the reduction of hematite and disappearance of calcium ferrite, the strength of sinter showed a strong decline when the reduction degree reached 10%. The value at the top of the cohesive zone was only about 15% of that on the charging bank. Powder from sinter was easily produced at these two places. 相似文献