| Title | Oxygen liquefaction economical value in the development of the hydrogen economy |
|---|---|
| ID_Doc | 15144 |
| Authors | Assunçao, R; Eckl, F; Ramos, CP; Correia, CB; Neto, RC |
| Title | Oxygen liquefaction economical value in the development of the hydrogen economy |
| Year | 2024 |
| Published | |
| Abstract | The wake of the Paris Agreement set as a global imperative the pursuit of carbon neutrality. To achieve it, green hydrogen will play a central role, serving as an energy carrier generated from the abundant renewable energies, that can be converted into other sustainable energy carriers, such as methanol, ammonia, and hydrocarbon fuels. Even though renewable electricity is already very competitive and, in some cases, cheaper than its fossil -fuel counterpart, green hydrogen is presently still much more expensive than grey hydrogen, creating an economical impasse in the decarbonization pathway. During electrolysis, that is used to produce hydrogen from water and electricity, molecular oxygen, a byproduct, is also produced and often discarded. However, O2 is a needed feedstock in several industries, already playing an important role in co -combustion, oxidation treatments and medical applications. In this work we show how the utilization of this O2 can help green hydrogen projects to reach economic viability by proposing a new liquefaction process, simulated with the Aspen Plus (R) software, for high purity electrolytic O2. Depending on the scale, for green hydrogen projects in the range of 50-500 MW, a levelized cost of liquid O2 of 0.040-0.059 euro/kgLO2 was obtained, competitive with the standard methods of O2 production such as cryogenic air separation and pressure swing adsorption. Considering a conservative liquid O2 selling price of 0.12 euro/kgLO2, the return on investment per year for such liquefaction unit can vary between 10% for 50 MW projects and 19-20% for 250-500 MW. The returns obtained this way can be used to self -subsidize their own H2 production reducing the cost between 0.49 and 0.64 euro/kgH2, respectively. The economic dynamization of electrolytic O2 through liquefaction, transforms a byproduct into a marketable commodity, which not only provides an additional revenue stream but also aligns with the broader goal of sustainable resource utilization and circular economy. |
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