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Volume 15
Issue 6
10.3390/ma15062008
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Article

Integrating a Top-Gas Recycling and CO2 Electrolysis Process for H2-Rich Gas Injection and Reduce CO2 Emissions from an Ironmaking Blast Furnace

by
Yichao Hu
1,
Yinxuan Qiu
1,
Jian Chen
2,
Liangyuan Hao
3,
Thomas Edward Rufford
1,
Victor Rudolph
1 and
Geoff Wang
1,*
1
School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Australia
2
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
3
The Strategy Research Institute, HBIS Group Co., Ltd., Shijiazhuang 050023, China
*
Author to whom correspondence should be addressed.
Materials 2022, 15(6), 2008; https://doi.org/10.3390/ma15062008
Submission received: 31 January 2022 / Revised: 4 March 2022 / Accepted: 6 March 2022 / Published: 8 March 2022
(This article belongs to the Special Issue Metallurgical Process Simulation and Optimization)
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Abstract

Introducing CO2 electrochemical conversion technology to the iron-making blast furnace not only reduces CO2 emissions, but also produces H2 as a byproduct that can be used as an auxiliary reductant to further decrease carbon consumption and emissions. With adequate H2 supply to the blast furnace, the injection of H2 is limited because of the disadvantageous thermodynamic characteristics of the H2 reduction reaction in the blast furnace. This paper presents thermodynamic analysis of H2 behaviour at different stages with the thermal requirement consideration of an iron-making blast furnace. The effect of injecting CO2 lean top gas and CO2 conversion products H2–CO gas through the raceway and/or shaft tuyeres are investigated under different operating conditions. H2 utilisation efficiency and corresponding injection volume are studied by considering different reduction stages. The relationship between H2 injection and coke rate is established. Injecting 7.9–10.9 m3/tHM of H2 saved 1 kg/tHM coke rate, depending on injection position. Compared with the traditional blast furnace, injecting 80 m3/tHM of H2 with a medium oxygen enrichment rate (9%) and integrating CO2 capture and conversion reduces CO2 emissions from 534 to 278 m3/tHM. However, increasing the hydrogen injection amount causes this iron-making process to consume more energy than a traditional blast furnace does.
Keywords: blast furnace; hydrogen injection; gas utilisation efficiency; energy consumption; CO2 emission blast furnace; hydrogen injection; gas utilisation efficiency; energy consumption; CO2 emission

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MDPI and ACS Style

Hu, Y.; Qiu, Y.; Chen, J.; Hao, L.; Rufford, T.E.; Rudolph, V.; Wang, G. Integrating a Top-Gas Recycling and CO2 Electrolysis Process for H2-Rich Gas Injection and Reduce CO2 Emissions from an Ironmaking Blast Furnace. Materials 2022, 15, 2008. https://doi.org/10.3390/ma15062008

AMA Style

Hu Y, Qiu Y, Chen J, Hao L, Rufford TE, Rudolph V, Wang G. Integrating a Top-Gas Recycling and CO2 Electrolysis Process for H2-Rich Gas Injection and Reduce CO2 Emissions from an Ironmaking Blast Furnace. Materials. 2022; 15(6):2008. https://doi.org/10.3390/ma15062008

Chicago/Turabian Style

Hu, Yichao, Yinxuan Qiu, Jian Chen, Liangyuan Hao, Thomas Edward Rufford, Victor Rudolph, and Geoff Wang. 2022. "Integrating a Top-Gas Recycling and CO2 Electrolysis Process for H2-Rich Gas Injection and Reduce CO2 Emissions from an Ironmaking Blast Furnace" Materials 15, no. 6: 2008. https://doi.org/10.3390/ma15062008

APA Style

Hu, Y., Qiu, Y., Chen, J., Hao, L., Rufford, T. E., Rudolph, V., & Wang, G. (2022). Integrating a Top-Gas Recycling and CO2 Electrolysis Process for H2-Rich Gas Injection and Reduce CO2 Emissions from an Ironmaking Blast Furnace. Materials, 15(6), 2008. https://doi.org/10.3390/ma15062008

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