文献类型：期刊文献

英文题名：Wall reduction and heat transfer characteristics of captured iron ore particles during flash ironmaking process

作者：Cheng, Yuxiang[1,2];Shen, Zhongjie[1,2,3,4];Yang, Yiru[1,2];Liang, Qinfeng[1,2];Xu, Jianliang[1,2];Dai, Zhenghua[1,2];Liu, Haifeng[1,2]

机构：[1]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai, Peoples R China;[3]East China Univ ofScience & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, POB 272, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China

年份：2023

卷号：50

期号：11

起止页码：1631

外文期刊名：IRONMAKING & STEELMAKING

收录：;EI(收录号：20232414246350);WOS:【SCI-EXPANDED(收录号:WOS:001003247900001)】；

基金：This work was supported by Shanghai Pujiang Program (21PJ1402300) [grant number 21PJ1402300]; Chinese Postdoctoral Science Foundation [grant number 2021TQ0108, 2022M711151]; Open Research Fund of State Key Laboratory of Multiphase Complex Systems [grant number No. MPCS-2021-D-07].

语种：英文

外文关键词：Flash ironmaking; captured iron ore particle; wall reaction; gas flowrate; liquid intermediate product; partial melting; heat and mass transfer; particle temperature

摘要：The wall reaction and heat transfer characteristics of captured particles in the flash ironmaking reactor are essential to the reduction degree and liquid phase flow. In-situ studies of near-wall reduction were conducted using a high-temperature hot-stage microscope. Furthermore, a mathematical model was established for analyzing heat and mass transfer in iron ore particles. Results showed that above 1642 K, haematite particles partially melted, forming a bilayer structure with a molten ring and unmolten core as the liquid intermediate product spread rapidly. Higher gas flowrates prolonged melting product diffusion time. The liquid intermediate product volume predicted by the mathematical model matched well with the experimental data. Computational analysis revealed fluctuating particle temperatures during the reaction process, with the degree influenced by the reaction rate. Fluctuations increased with higher CO gas flowrate, particle size, and gas temperature, with gas temperature being the most influential factor.