Hydrogen is widely seen as a crucial weapon in the fight to avert the catastrophic consequences of a post-2°C world. A world in which, according to the Natural Resources Defence Council, rising global temperatures would cause widespread human and agricultural devastation while disproportionately affecting lower-income communities.
Pre-pandemic, the urgency of facilitating a global switch to green energy across multiple industries led Japan to request a detailed investigation by the International Energy Agency into how hydrogen could be part of the wider solution. Their recommendations included establishing a “role for hydrogen in long-term energy strategies,” and stimulating “commercial demand for clean hydrogen”.
A recent report by Hydrogen Europe detailed how more than 30 countries have already begun implementing their own hydrogen strategies, the main goals of which include reducing emissions, especially in “hard to abate sectors” like “industry, mobility, electricity balancing and heating”, diversifying energy supplies, integrating renewables, fostering economic growth, and more.
Yet despite its potential to be a cost-effective “carbon-free energy carrier” with an array of industrial applications, the report says there is currently “no public infrastructure, no public market and no market regulation for hydrogen”. Instead, hydrogen is mainly used as “feedstock to produce chemical products” like ammonia and methanol, or to de-sulphurise oil producing kerosine, gasoline, and diesel.
Hydrogen Europe’s report sketches various ways in which hydrogen produced by natural gas can be effectively decarbonised via the use of modified technologies, such as carbon capture and storage (CCS) using autothermal reforming plants, or methane pyrolysis. Yet associated costs and difficulties in achieving 100% CO2 capture make these approaches potentially less promising than alternative longer-term options. Additionally, the colour of hydrogen produced using these methods ranges from grey to turquoise, falling short of the gold standard whereby climate-neutral green hydrogen is produced using renewable energy or biomass.
Despite the hydrogen industry only being pregnant with promise, some countries have made bold plans to dramatically scale up green hydrogen production to 2040. According to our analysis of GlobalData’s data, prior to the invasion of Ukraine, Australia and Russia were leading the way with respect to planned capacity; however, current estimates are now subject to considerable uncertainty.
By contrast, although numerous countries plan to increase their total number of green hydrogen plants, this does not necessarily equate to a significant increase in total annual capacity. Russia and Kazakhstan have planned far fewer plants than many other countries yet are due to have much greater annual capacity over the next 15–20 years.
One key hard-to-abate sector thought to be eligible for decarbonisation using green hydrogen is the iron and steel industry. According to a COP26 report by the Leadership Group for Industry Transition, steel production is thought to account for around 10% of global CO2 and 7% of global greenhouse gas emissions. The paper argues that the industry is expected to grow by up to a third between now and 2050, and that without a radical decarbonisation strategy, future emissions could use up “almost 20% of the remaining global CO2 budget for a 50% chance to keep global warming below 1.5°C.”
Research by Mitsubishi Heavy Industries’ Primetals Technologies found that approximately 70% of current global steel production capacity (i.e. the share currently based on coke and coal) is suitable for a switch to hydrogen power. Producing a tonne of steel requires around 55kg of hydrogen. To successfully decarbonise the industry based on current production figures, this translates into needing 72Mt of annual green hydrogen capacity, with 500GW of electrolyser capacity.
Using this estimate as a benchmark, our analysis of GlobalData’s green hydrogen database shows that even if all currently planned green hydrogen plants become fully operational on schedule, maximum global capacity would fall significantly short of this target. This is especially the case since new green hydrogen capacity will by no means be exclusively reserved for the steel industry.
Primetals has developed a range of solutions to the challenge of cleaning up the steel industry while global green hydrogen capacity increases. According to recent research, direct reduction technologies hold the greatest promise for rapid decarbonisation. The paper says: “The direct reduction process based on hydrogen is one of the future steel production routes with the highest potential for a substantial reduction of CO2 emissions.”
Primetals’ has a long-standing partnership with MIDREX®, whose technology already has the capacity to produce direct reduced iron from both natural gas, hydrogen or a mixture of both, up to and including 100% H2.
“Primetals Technologies is well positioned because we have a broad portfolio when it comes to direct reduction utilising hydrogen,” saysDr Alexander Fleischanderl, technology officer upstream at Primetals Technologies.
The company is also developing new technologies that complement the likes of MIDREX, which relies on agglomerated iron-ore pellets. “We also have fluidised bed technologies that can feed iron ore directly without pelletising,” says Fleischanderl.
Primetals deployed its FINORED-based fluidised bed technology in Australia and Venezuela at the beginning of the millennium. This technology was also basis of the first process step for FINEX®, jointly developed by Primetals Technologies and POSCO, and now fully operational at a Korean plant run by Posco, which could also utilise hydrogen. Fleischanderl describes another flagship initiative:
“One of our lighthouse development projects where we have just recently commissioned a pilot plant in Austria at Voestalpine is HYFOR (Hydrogen-based fine ore reduction),” says Fleischanderl. “That is a missing portfolio element; no one has ever done this.
“A lot of [iron] ores are extremely fine from the beneficiation; sub-micron iron ores that are difficult to pelletise. We are developing a technology that allows us to feed this ultra-fine iron ore directly based on hydrogen reduction.”
A stepwise switch
By switching to hydrogen, Primetals estimates an immediate CO2 reduction of approximately 91% could be achievable compared with the coal-based BF-BOF baseline. However, as its report also states, decarbonising iron and steel via hydrogen direct reduction requires an entirely renewable electricity system. This represents a significant hurdle on the road to a truly green global economy.
Despite the lack of ideal circumstances, Dr Fleischanderl stresses the importance of not allowing the pursuit of perfection to become the enemy of progress. “Any option is better than sit and wait,” he says. “The first implementations targeting green hydrogen might happen, but meanwhile we have to go for the options.
“At least if we go for direct reduction technology and use natural gas, we already can decarbonise by two-thirds compared to the traditional route of coal-coke based blast furnaces.”
He also describes the benefits of “larger-scale electric arc furnaces” in tandem with renewables and recycled scrap to produce low-carbon steel, and carbon capture combined with direct reduction as viable “bridging technologies” on the road to net zero. Additional short-term optimisation strategies could allow companies to quickly reduce emissions by up to 30%, although this represents an upper limit.
Primetals is also working with MIDREX on numerous ground-breaking efforts to maximise currently available solutions that have intrinsic longevity and adaptability to take advantage of future green hydrogen supplies. Fleischanderl gives the example of two large-scale Russian plants based on an innovative design that can utilise hydrogen whenever it becomes available at scale. They can also gradually alter the proportions of natural gas and hydrogen in a stepwise fashion until both plants run entirely on the latter.
Source: https://www.energymonitor.ai/Tags: Feedstock, Hydrogen, IEA, LNG, Steel