Numerical simulation analysis of reduction domain in hydrogen metallurgy shaft furnace
CHAI Xi-cui1, YUE Qiang1,2, ZHANG Yu-jie1, WANG Qi1
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. State Environmental Protection Key Laboratory of Eco-Industry, Shenyang 110819, Liaoning, China
Abstract：Iron and steel industry is important basic industry for China's national economic development. Under the background of "carbon peak and carbon neutralization", low-carbon production has become a new competitiveness of iron and steel industry. The increasing environmental awareness calls for the development of innovative technologies. Hydrogen metallurgy is recognized as the cleanest and the most environment friendly metallurgical technology in the world, and clean and renewable energy are used in the iron-making process. The use of H2 can reduce the greenhouse gas emissions caused by the iron-making process and reduce the emissions brought by carbon reductants from the source. Numerical simulation of hydrogen metallurgy shaft furnace is an important method to study the internal characteristics of iron and steel metallurgical process, which can provide an effective strategy for smooth operation. The purpose is to set reasonable furnace type parameters and reduction conditions of hydrogen direct reduction reactor. According to the rule of countercurrent reduction shaft furnace and the principle of safe, reliable, stable running, high efficiency and energy saving, this paper gave full play to the advantages of H2 reduction, using existing shaft furnace design and production experience, carried out numerical simulation analysis on the reduction domain of hydrogen metallurgy shaft furnace with the help of Ansys, and which focused on the technological advantages of pure hydrogen in high temperature reduction conditions. The results show that the contants of gaseous reactants decreases while the contants of gaseous products increases when the reduction reaction goes along the hydrogen reduction shaft furnace. At the same time, the reduction reaction is mainly concentrated in the middle and lower part of the reduction domain, that is, 0.5-2.0 m height. Reasonable setting of reduction conditions and parameters of reduction domain can significantly improve the reduction degree of the whole process, slow down the consumption of raw materials, and achieve optimal efficiency, so as to provide reasonable suggestions for the long-term transition to all-hydrogen shaft furnace combined with the trend of low-cost renewable energy, support hydrogen metallurgy industrialize application as soon as possible, and provide theoretical support for hydrogen metallurgy industrial design.
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2022, Vol. 57 
