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Researchers from University of Birmingham, U.K., show novel adaptation for existing furnaces could reduce steelmaking emissions by 90%


News provided by

University of Birmingham Enterprise

24 Jan, 2023, 08:30 GMT

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BIRMINGHAM, England, Jan. 24, 2023 /PRNewswire/ -- Researchers from the University of Birmingham, U.K., have designed a novel adaptation for existing iron and steel furnaces that could reduce carbon dioxide (CO2) emissions from the steelmaking industry by nearly 90%.

This radical reduction is achieved through a 'closed loop' carbon recycling system, which could replace 90% of the coke typically used in current blast furnace-basic oxygen furnace systems and produces oxygen as a biproduct.

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Iron and steelmaking is the biggest emitter of CO2 of all foundation industrial sectors, accounting for 9% of global emissions

Devised by Professor Yulong Ding and Dr Harriet Kildahl from the University of Birmingham's School of Chemical Engineering, the system is detailed in a paper published in the Journal of Cleaner Production, which shows that if implemented in the UK alone, it could deliver cost savings of £1.28 billion in 5 years while reducing overall UK emissions by 2.9%. 

Professor Ding said: "Current proposals for decarbonising the steel sector rely on phasing out existing plants and introducing electric arc furnaces powered by renewable electricity. However, an electric arc furnace plant can cost over £1 billion to build, which makes this switch economically unfeasible in the time remaining to meet the Paris Climate Agreement.  The system we are proposing can be retrofitted to existing plants, which reduces the risk of stranded assets, and both the reduction in CO2, and the cost savings, are seen immediately."

The novel recycling system captures the CO2 from the top gas and reduces it to CO using a crystalline mineral lattice known as a 'perovskite' material.  The material was chosen as the reactions take place within a range of temperatures (700-800oC) that can be powered by renewable energy sources and/or generated using heat exchangers connected to the blast furnaces. 

Most of the world's steel is produced via blast furnaces which produce iron from iron ore and basic oxygen furnaces which turn that iron into steel. 

The process is inherently carbon intensive, using metallurgical coke produced by destructive distillation of coal in a coke oven, which reacts with the oxygen in the hot air blast to produce carbon monoxide.  This reacts with the iron ore in the furnace to produce CO2. The top gas from the furnace contains mainly nitrogen, CO and CO2, which is burned to raise the air blast temperature up to 1200 to 1350oC in a hot stove before blown to the furnace, with the CO2 and N2 (also containing NOx) emitted to the environment.

Under a high concentration of CO2, the perovskite splits CO2 into oxygen, which is absorbed into the lattice, and CO, which is fed back into the blast furnace.  The perovskite can be regenerated to its original form in a chemical reaction that takes place in a low oxygen environment. The oxygen produced can be used in the basic oxygen furnace to produce steel.

The new system can be retrofitted to existing furnaces, with the addition of an array of additional gas separators and heat exchangers required to support the perovskite splitter. 

Iron and steelmaking is the biggest emitter of CO2 of all foundation industrial sectors, accounting for 9% of global emissions. According to the International Renewable Energy Agency (IRENA), it must achieve a 90% reduction in emissions by 2050 to limit global warming to 1.5°C. 

University of Birmingham Enterprise has filed a patent application covering the system and its use in metal production and is looking for long-term partners to participate in pilot studies, deliver this technology to existing infrastructure, or collaborate on further research to develop the system.  

Cost effective decarbonisation of blast furnace – Basic oxygen furnace steel production through thermochemical sector coupling is published in the Journal of Cleaner Production, and available at https://doi.org/10.1016/j.jclepro.2023.135963 

The University of Birmingham is ranked amongst the world's top 100 institutions. Its work brings people from across the world to Birmingham, including researchers, teachers and more than 6,500 international students from over 150 countries.

University of Birmingham Enterprise helps researchers turn their ideas into new services, products and enterprises that meet real-world needs. We also support innovators and entrepreneurs with mentoring, advice, and training and manage the University's Academic Consultancy Service. View our portfolio of technologies available for licensing.

Photo - https://mma.prnewswire.com/media/1988676/University_of_Birmingham.jpg

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