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Production of “green” nitrogen with liquid hydrogen.

Number: 0003

Author(s) : HERZOG F., SCHLOTMANN A., CORVAY S., EVISON T.

Summary

To decarbonize European industry, large quantities of “green” hydrogen are needed. Some of the hydrogen required will be imported in liquid form via LH2 terminals. The liquefied hydrogen is stored in the terminals at a temperature of -253°C (20 K). When needed the liquid hydrogen is withdrawn from the storage vessels, pressurized with cryogenic pumps, regasified using heat and then fed into a pipeline network. The cold of the liquid hydrogen is wasted. One idea to make use of this cold energy is to recover it to help produce liquid nitrogen (or oxygen). The nitrogen is separated from the air in a standard air separation plant and then liquefied. Hydrogen cooling can contribute to increasing the efficiency of the air separation process. But primarily the cold energy is used for the liquefaction of nitrogen, the process step with the highest energy requirement. The nitrogen condensation can then take place practically without the addition of external energy, and nitrogen freezing in the condenser is avoided by a specially developed process technology.

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Pages: 6 p.

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Details

  • Original title: Production of “green” nitrogen with liquid hydrogen.
  • Record ID : 30033866
  • Languages: English
  • Subject: Technology
  • Source: Cryogenics 2025. Proceedings of the 18th IIR International Conference on Cryogenics, Prague, Czech Republic, 7-11 April 2025.
  • Publication date: 2025/04/07
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2025.0003

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