板坯结晶器钢液流动传热和摩擦行为的数值模拟

结晶器摩擦力对连铸顺行非常重要,而钢液流动行为会影响铸坯温度场和保护渣分布,可能对铸坯摩擦力产生一定的影响.利用Fluent软件建立结晶器内钢液流动、传热三维数学模型,并将温度场数据导入Ansys计算铸坯应变,然后根据铸坯-保护渣-结晶器摩擦行为数学模型讨论了渣膜润滑情况,对比了不同水口底部形状下结晶器内液态、固态和总摩擦力.结果表明:不考虑水口射流时结晶器总摩擦力比考虑水口时增大约29.4％;浸入式水口底部形状分别为凸底、平底和凹底3种情况下铸坯窄面中心温度依次降低,凝固壳厚度依次增大,固态摩擦力依次增大,总摩擦力依次增大,液态摩擦力相差较小.     

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KMnO4 is a kind of pulverized coal combustion improver which is suited for the blast furnace. Mn7+(CO-)7 weakened bridge adhesion of carbon structural units and changed lattice structures, activation energy of pulverized coal was lowered and burn rate was accelerated. The unburned coal, which was investigated by the method of XRD and SEM, was collected through simulating combustion conditions of blast furnace. The results show that: microcrystalline parameters of unburned coal is increased, height and diameter of aromatic slices will increase 0??0013 and 0??0366nm respectively as KMnO4 joined; particles size of unburned coal powder can be reduced 2??62??m by adding KMnO4.     

CeO2催化强化高炉喷吹煤粉燃烧机制

为了研究稀土氧化物CeO2对高炉喷吹煤粉的助燃机制,以某炼铁厂高炉喷吹煤粉为原料,利用煤粉燃烧炉进行煤粉燃烧试验并收集未燃煤粉,通过热重-差热法分析CeO2对喷吹煤粉的助燃机制,结合XRD和SEM检测分析未燃煤粉.结果表明:助燃剂CeO2对喷吹煤粉的助燃效果显著,其添加比例控制在1.5％(质量分数)左右比较适宜;CeO2在煤粉固定碳表面上形成络合盐Ce4+(CO-)4,减弱了两相反应物间的势能垒,促使挥发分的开始燃烧放热温度降低,固定碳燃烧温度区间变窄;随着CeO2的加入,Ce4+ (CO)4成倍增长,在XRD图谱中表现为未燃煤粉的微晶尺寸逐渐增大;在CeO2的作用下未燃煤粉颗粒的平均粒径与原煤未燃煤粉颗粒的平均粒径相比减小了3.48 μm,表面出现大量孔洞结构.     

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The influence of basic characteristics of eight iron ores on properties of sinter was investigated by mini-sintering and sinter pot test. The results show that the tumbler index of sinter rises with the increasing of the strength of bonding phase and crystal strength. The RDI??3. 15 mm of sinter can be improved when liquid phase fluidity and creating ability of calcium ferrite of iron ores increase. The RI of sinter mainly relates to the kinds of iron ores and sintering technological parameters. The sinter RI of magnetite ores rises with the increasing of liquid phase fluidity and creating ability of calcium ferrite but has little relationship with other basic characteristics of iron ores.     

《生物年代》信息分析系统—研究含油气盆地的地层古生物资料和信息处理的数据库

现阶段含油气盆地的研究需要引入新的设备和手段，以处理日益增加的各种地质信息。地层－古生物资料块就是进一步分析这类信息最独特、最重要的手段之一。计算机处理技术，资料的累积、统一、保存和多结构的分析，以及利用大量的地层古生物资料，对认识含油气盆地的结构、形成、发展史提供了新的契机。为了开展这项研究工作，建议使用《生物年代》专用信息分析系统。     

钛合金改善X80管线钢中硫化物析出的研究

管线钢中的 MnS 对管线钢的韧性、焊接性能、应力腐蚀断裂等性能都有着不可忽视的影响.以不同 S 含量的 X80 管线钢为研究对象,通过加入不同的 Ti 含量控制 MnS 的生成,使其生成 Ti4 C2 S2 .运用 Factsage 软件模拟计算,探讨了 Ti 含量对 MnS 析出的影响,计算得到了不同 S 含量下 Ti4 C2 S2 析出时的临界 Ti 含量.在实验室条件下,制作了不同 Ti、S 含量下的试样,采用 SEM、EDS 观察不同条件下试样中夹杂物的形貌、尺寸和成分变化.研究表明,管线钢中加入 Ti 合金可以使 MnS 转化生成 Ti4 C2 S2 ,且 随 钢 中 S 含 量 的 提 高 其 要 求 转 化 生 成Ti4 C2 S2 的 Ti 含量也需提高.     

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The effect of titanium on microstructure of sinter was investigated by metallographic microscope and sintering test. The results show that, with the increase of TiO2 content, the content of perovskite in binder phase has a notable increase, the content of calcium ferrite has a trend to decrease, the content of glass phase rises, the content of dicalcium silicate remains stable, the pores in sinter reduce significantly. In the structure of ore phase, most perovskite shows amorphous and allotriomorphic, which fills in the mineral powder. A little perovskite shows dendritic, which distributes intensively. Calcium ferrite shows acicular, columnar and platy structure, which distributes unequally. Dicalcium silicate distributes with willow structure. The shapes of gas hole are irregular and crack exists throughout them. Binder phase strength of sinter reduces with increase of the content of TiO2. Through the sintering cup test verifying, with the increase of TiO2 content, the tumbler decreases, which meets the influencing law of titanium on microstructure of sinter.