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集成顶气循环与CO电解工艺用于富氢气体注入并减少炼铁高炉的CO排放

Integrating a Top-Gas Recycling and CO Electrolysis Process for H-Rich Gas Injection and Reduce CO Emissions from an Ironmaking Blast Furnace.

作者信息

Hu Yichao, Qiu Yinxuan, Chen Jian, Hao Liangyuan, Rufford Thomas Edward, Rudolph Victor, Wang Geoff

机构信息

School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Australia.

College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2022 Mar 8;15(6):2008. doi: 10.3390/ma15062008.

DOI:10.3390/ma15062008
PMID:35329460
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8953265/
Abstract

Introducing CO electrochemical conversion technology to the iron-making blast furnace not only reduces CO emissions, but also produces H as a byproduct that can be used as an auxiliary reductant to further decrease carbon consumption and emissions. With adequate H supply to the blast furnace, the injection of H is limited because of the disadvantageous thermodynamic characteristics of the H reduction reaction in the blast furnace. This paper presents thermodynamic analysis of H behaviour at different stages with the thermal requirement consideration of an iron-making blast furnace. The effect of injecting CO lean top gas and CO conversion products H-CO gas through the raceway and/or shaft tuyeres are investigated under different operating conditions. H utilisation efficiency and corresponding injection volume are studied by considering different reduction stages. The relationship between H injection and coke rate is established. Injecting 7.9-10.9 m/tHM of H saved 1 kg/tHM coke rate, depending on injection position. Compared with the traditional blast furnace, injecting 80 m/tHM of H with a medium oxygen enrichment rate (9%) and integrating CO capture and conversion reduces CO emissions from 534 to 278 m/tHM. However, increasing the hydrogen injection amount causes this iron-making process to consume more energy than a traditional blast furnace does.

摘要

将CO电化学转化技术引入炼铁高炉，不仅能减少CO排放，还能产生H作为副产品，H可作为辅助还原剂进一步降低碳消耗和排放。在向高炉供应足够H的情况下，由于高炉内H还原反应不利的热力学特性，H的喷吹量受到限制。本文对炼铁高炉在考虑热需求的不同阶段H的行为进行了热力学分析。研究了在不同操作条件下，通过风口回旋区和/或竖炉风口喷吹贫CO炉顶煤气和CO转化产物H-CO气体的效果。通过考虑不同还原阶段，研究了H的利用效率和相应的喷吹量。建立了H喷吹量与焦比之间的关系。根据喷吹位置的不同，喷吹7.9 - 10.9 m³/tHM的H可节省1 kg/tHM的焦比。与传统高炉相比，在中等富氧率（9%）下喷吹80 m³/tHM的H并结合CO捕集与转化，可将CO排放量从534 m³/tHM降至278 m³/tHM。然而，增加H喷吹量会使该炼铁工艺比传统高炉消耗更多能量。

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