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Hydrogen key to green steel: Finkel

Madeleine Achenza
Australian steel manufacturing can be globally competitive, while cutting down emissions, if a domestic hydrogen industry is grown, according to Alan Finkel, Australia’s Chief Scientist.

This would allow Australia to tap into a $2 trillion global market for hydrogen by 2050, according to a 2017 Hydrogen Council report.
Coal used in steel manufacturing is responsible for 7% of carbon dioxide emissions globally. Replacing coal with hydrogen would help nations meet their Paris Agreement goals. 

A 2018 study by the HYBRIT project in Sweden, estimated that the cost of green steel will be about 20% to 30% above traditional blast furnace steel. While it is more expensive, with international or domestic carbon pricing, hydrogen will become more price competitive against traditional steel manufacturing.

While a few companies in Europe have already started to build green steel manufacturing plants, Australia’s competitive advantage comes from its vast amounts of sunlight, and wide open plains for wind turbines.

This renewable energy can be used to split water into hydrogen and oxygen, via a process called electrolysis, with the hydrogen gas captured to use as a source of energy or heat. Finkel has called for the use of fossil-fuels to power early hydrogen plants to get a head start in the global market.

“Think for a moment of the vast amounts of steel, aluminium and concrete needed to support, build and service solar and wind structures,” notes Finkel. Renewable energy could be used to create the steel which builds new clean energy infrastructure.

“Fortunately, clean hydrogen can not only provide the energy that is needed to heat the blast furnaces, it can also replace the carbon in coal used to reduce iron oxide to the pure iron from which steel is made. And with hydrogen as the reducing agent the only by-product is water vapour,” explains Finkel.

In Sweden, the world’s first large scale pilot plant for green steel is in development, through steelmaker SSAB AB. Thyssenkrupp plans on running three of their steel blast furnaces completely on hydrogen by 2023.

Pilot projects are underway in Australia to create hydrogen using renewable energy, including the world’s largest green ammonia plant in Queensland

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