The Sigmas Institute presents this report to examine one of the most significant industrial transformations of the 21st century. The steel industry, a cornerstone of human civilization’s development, has consistently faced a major challenge: carbon emissions. With increasing global pressure to combat climate change, leading companies are redefining their production processes. In this context, POSCO’s introduction of the HyREX technology outlines a new vision for carbon-free steelmaking, which can serve as a model for the future of the industry.
The Challenge of Traditional Methods: The Era of the Blast Furnace
To appreciate the significance of this innovation, we must first look at conventional methods. For many years, steel production has relied on the Blast Furnace (BF). In this process, iron ore and coal (in the form of coke) react at extremely high temperatures. Coal serves a dual role: both as a thermal fuel and as a reducing agent that separates oxygen from the iron ore. The inevitable byproduct of this chemical process is carbon dioxide (CO2), which contributes significantly to global industrial pollution.
FINEX Technology: The Foundation for Innovation
Before reaching the stage of complete carbon elimination, POSCO took a crucial step by developing FINEX technology. Unlike traditional methods requiring costly and polluting preliminary processes such as sintering and coking, FINEX technology allowed for the direct use of fine iron ore and non-coking coal. This technology, based on fluidized bed reactors, not only reduced costs and pollution but also provided the necessary technical infrastructure for the next major leap: HyREX.
The HyREX Revolution: Replacing Carbon with Hydrogen
The Sigma Institute identifies the turning point of this transformation in Hydrogen Reduction technology, or HyREX. This technology represents a fundamental shift in the chemistry of steelmaking. In the HyREX process, hydrogen replaces coal as the reducing agent.
While in older furnaces, the combination of carbon with the oxygen in the iron ore resulted in the production of the greenhouse gas CO2, in the HyREX method, hydrogen combines with oxygen, and the output product is simply water vapor (H2O).
Competitive Advantage: Fluidized Bed Reactors
One of the distinguishing features of POSCO’s approach, emphasized by the Sigma Institute, is the use of fluidized bed reactors. Conventional direct reduction methods using Shaft Furnaces require the pelletization of iron ore. However, HyREX technology, leveraging the successful experience of FINEX, allows high-temperature hydrogen gas to come into direct contact with powdered iron ore, carrying out the reduction process with high efficiency and without the need for expensive preparations.
The 2050 Vision: Towards Carbon Neutrality
The roadmap indicates that by 2050, the steel industry can be completely transformed. This plan involves the gradual replacement of blast furnaces with HyREX facilities and the increased use of Electric Arc Furnaces (EAFs). The key element in this ecosystem is the supply of necessary hydrogen through renewable energy sources such as solar and wind power, known as green hydrogen. Consequently, the entire steel production chain will be free of carbon emissions from start to finish.
Conclusion by The Sigmas Institute
What is observed in HyREX technology is not merely a technical advancement but a strategic response to the environmental imperatives of the world today. The Sigmas Institute believes that the transition from carbon to hydrogen is not an option but an inevitable path for the survival of heavy industries in the future. This technology promises an era where industrial development and environmental preservation are not in conflict but can move forward in alignment.