Experimental Study on the Reduction Rate of Sinter under the Conditions in a Blast Furnace

高炉条件下烧结矿还原率的试验研究

• 批准号: 59850110
• 负责人: OHMI Munekazu
• 金额: $ 5.18万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1985
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850110/
• 关键词: Blast Furnace; Sinter; Reaction Rate; Reduction; Fixed Bed; Three Interface Model; 段階ごとの還元

To obtain the rate equations expressing the reduction rate of sinter in a blast furnace. the following experiments and analyses were carried out, and conclusions have been obtained as follows:1. The methods estimating the physical-property values and other constants were examined. Mass transfer from naphthalene-coated sinter was measured and the equation for mass transfer coefficient in a gas film of sinter was derived in consideration of shape factor.2. Single particles of sinter were reduced stepwise and directly with CO- <CO_2> - <N_2> or <H_2> - <H_2> O- <N_2> gas mixtures over a temperature range of 500゜ to 1000゜C, and reduction curves were measured gravimetrically.3. Partially reduced samples were cooled quickly in a nitrogen stream, and their cross sections were observed in a microscope.4. Fixed beds of sinter (500g) were reduced stepwise over the same temperature range as in item 2; fractional reduction was evaluated from gas analysis by an infrared gas analyzer and a gas chrom … More atograph for CO- <CO_2> - <N_2> and <H_2> - <H_2> O- <N_2> reduction experiments, respectively.5. From the experimental results in items 2-4, the reduction rates were analyzed on the basis of the unreacted-core shrinking models for one and three interfaces; kinetic parameters in the models were evaluated and the temperature dependencies of the parameter values obtained in each case were presented. Results from single particle experiments scattered badly, while results from fixed bed experiments reproduced well. Calculated reduction curves using the equations for the rate parameters as a function of temperature sescribed the measured ones satisfactoryly.6. Fixed bed reduction experiments were done under temperature and gas concentration variant conditions simulated in a blast furnace. Comparison of these experimental results with the calculated ones based on three interface model using the equations for the rate parameters in item 5 showed that both results were much the same except at high temperatures. Less

建立了高炉烧结矿还原速率方程。进行了以下实验和分析，并得到如下结论：1.对物性值和其他常数的估算方法进行了研究。对萘包覆烧结矿的传质过程进行了测量，并考虑形状因素，推导出烧结矿气膜内传质系数的计算公式.在<CO_2><N_2><H_2><H_2><N_2>500 ℃ ~ 1000 ℃的温度范围内，用CO-或- O-混合气体对烧结矿的单颗粒进行分步直接还原，并用重量法测定还原曲线.将部分还原的样品在氮气流中快速冷却，在显微镜下观察其横截面.在与第2项相同的温度范围内逐步还原烧结矿固定床（500 g）;通过红外气体分析仪和气相色谱仪进行气体分析，评价还原分数。 ...更多信息 分别用于CO<CO_2>-<N_2>和<H_2>-<H_2>O-<N_2>还原实验。根据第2-4项的实验结果，基于一个和三个界面的未反应核收缩模型分析了还原率;评估了模型中的动力学参数，并给出了在每种情况下获得的参数值的温度依赖性。单颗粒实验的结果分散性差，而固定床实验的结果重现性好。用速率参数随温度变化的方程计算的还原曲线与实测值吻合较好.在模拟高炉内不同温度和煤气浓度条件下进行了固定床还原实验。将实验结果与根据三界面模型计算的结果进行了比较，结果表明，除高温外，两种结果基本一致。少

项目成果

Tetsu-to-Hagane. 71-12. (1985)

铁到哈金。

Tetsu-to-Hagane. 70-10. (1984)

铁到哈金。

鉄と鋼. 71-12. (1985)

钢铁。71-12。

鉄と鋼. 70-10. (1984)

钢铁。70-10。

Proceedings of the Fifth International Iron and Steel Congress. (1986)

第五届国际钢铁大会论文集。