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

To obtain the rate equations expressing the reduction rate of sinter in a blast furnace.以下的实验和分析已经被带走了，而且合并也被发现为后续：1。该方法估计了物理属性值和其他常数已被测试过。从纳弗他林涂层的稀释剂中进行了质量转移，并在气体薄膜的稀释剂中产生了质量转移协同效应，以确定形状因子的假设。单个粒子的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。部分减少的样本在一个硝基流中很酷，并且他们的交叉部分在一个显微镜中观察到。固定床（500克）在项目2中的温度范围内降低了步骤;分段减少了通过红外气体分析仪和气体色谱仪从气体分析中评估的气体分析 ... More atograph for CO-<CO_2>-<N_2>and<H_2>-<H_2>O-<N_2>reduction experiments， respectively.5。根据项目2-4中的实验结果，对一个和三个接口的无反应核收缩模型的降低率进行了分析;模型中评估的动力学参数以及参数值的温度依赖性在每个情况下获得的。单个粒子实验的结果分散得很差，但固定床实验的结果却得到了良好的结果。计算的减少曲线使用比率参数作为温度参数的一个功能，将测量的物质满足因子。固定床减少实验在高温和气体集中的变化条件下模拟了在燃烧炉中。对这些实验结果的比较是基于计算单元的三个接口模型使用等式来实现速率参数的比较，其中两个结果都是相同的，但在高温下除外。Less（低）

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