Heat and Mass Transfer in the Reduction of Single Hematite Pellet by Hydrogen
Heat and Mass Transfer in the Reduction of Single Hematite Pellet by Hydrogen
复制标题
氢气还原赤铁矿球团的传热传质
DOI：
10.2355/tetsutohagane1955.63.7_1090
复制
发表时间：
1977
影响因子：
0.3
通讯作者：
K. Sawamura
中科院分区：
文献类型：
--
作者：
Takeaki Murayama;Setsuo Ishimatsu;K. Sawamura
概要：在 800°-1050°C 的本体气体温度范围内，测量氢气还原过程中球形赤铁矿球团的重量损失以及中心和表面的温度变化。在还原过程中观察到颗粒中心的两步温度下降。 X射线衍射证明，第一步主要对应于Fe2O3还原为FexO，第二步对应于FexO还原为Fe。还原过程中表面温度与中心温度不一致。将等温模型和非等温半非定常模型应用于实测值，考察了模型的适用性。两种模型计算出的减少曲线与测量值非常吻合。除第一步外，非等温半非定常模型预测的温度变化与实测值一致。
Synopsis: The weight-loss and the variations in temperature at the center and the surface of a spherical hematite pellet were measured during H2 gas reduction in the bulk gas temperature range of 800°-1050°C. Two step temperature drop in the center of a pellet was observed in the reduction. It was proved by X ray diffraction that the first step mainly corresponds to the reduction of Fe2O3 to FexO, and the second step corresponds to the reduction of FexO to Fe. The surface temperature did not agree with the center temperature during the reduction. Applying the isothermal model and the non isothermal semi-unsteady model to the measured values, the applicability of the models was investigated. The reduction curves, which were calculated by both models, agreed with the measured values closely. The temperature variation predicted by non isothermal semi-unsteady model agreed with the measured value except the first step.