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Purification Systems

Systems designed to purify hydrogen to 99.999% automotive-grade quality, ensuring the removal of impurities regardless of the source of hydrogen production​​.

Hydrogen Purification Systems R-PUR

Function of R-PUR Hydrogen Purification Systems

R-PUR hydrogen purification systems are designed to ensure gas purity at the level of 99.999%. These devices are installed to remove the oxygen and water vapour that are present in the hydrogen coming out of the electrolysis process.

Hydrogen coming directly from electrolyzers is characterized by a purity of 99.9%. A hydrogen purity of 99.999% is required to use it in fuel cells, among other applications.

Thanks to the high purity, the dew point temperature is low enough that there is no risk of condensation across a very wide range of pressures.

How the R-PUR Hydrogen Purification System is Built

The R-PUR hydrogen purification system consists of an oxygen removal unit (Deoxo) and two drying columns.

The oxygen removal unit consists of a pressure vessel filled with a catalyst that induces and intensifies the reaction of combining oxygen with hydrogen. The product of this reaction is water and a large amount of heat.

The desiccant columns separate the water vapour by means of adsorbents that are located inside these tanks. Water vapour molecules are trapped on the surface of the adsorber. Due to the limited capacity of water vapour accumulation, it is necessary to regenerate the adsorbers. For this purpose, the hydrogen purification system has two drying columns. While one of them dries the hydrogen, the other is regenerated.

Scope of Delivery of R-PUR Hydrogen Purification Systems

Basic Equipment

  • Oxygen removal column (Deoxo)
  • Two water vapour removal columns
  • Heaters and coolers for operation
  • Shut-off valves with pneumatic drive
  • Coalescing filter
  • Safety valves
  • Frame construction
  • Dew point sensor
  • Necessary measuring devices
  • Control for automatic continuous operation
  • Blow-off branch

Accessories

  • Containerised construction
  • Electrically driven shut-off valves
  • Auxiliary system with air compressor

Services & Maintenance

  • On-site transport and unloading
  • Additional maintenance for storage
  • Making connections between system components
  • Connecting the system to utilities
  • Participation in commissioning
  • Personnel training
  • Periodic inspections and servicing

Main Advantages of R-PUR Hydrogen Purification Systems

Durability: The design based on proven components and the high standards of project implementation at Rockfin are a guarantee of long-term reliability of R-PUR hydrogen purification systems.

Proven Technology: Decades of adsorption and catalysis technology guarantee the reliable performance of the purification systems.

Scalability: R-PUR hydrogen purification systems are suitable for both small electrolyzers and megawatt industrial installations.

Compliance with EU Directives and Industry Standards

R-PUR hydrogen purification systems are CE marked and manufactured in accordance with the following industry directives and standards:

  • MD 2006/42/EC – Machinery Directive,
  • PED 2014/68/EU – Pressure Equipment Directive,
  • EN 61508 – Functional safety of control systems,
  • EN 61511 – Functional safety – Safety instrumented systems for the sector, process industry,
  • EN 12100 – Safety of machinery – General design principles – Risk assessment and risk reduction,
  • EN 60204-1 – Safety of machinery – Electrical equipment of machinery,
  • EN 1127-1 – Explosive atmospheres – Explosion prevention and protection,
  • EN 60079 – Series of standards for the safety of electrical equipment used in potentially explosive atmospheres,
  • EN 764-7 – Pressure equipment – Safety systems used in equipment not heated by flame,
  • EN 13445 – Unfired pressure vessels,
  • ASME BPVC VIII – Rules for construction of pressure vessels according to ASME,
  • ASME B31.12 – Hydrogen piping,
  • EIGA DOC 15 – Hydrogen installations,
  • EIGA DOC 211 – Hydrogen discharge systems for commercial systems,
  • EIGA DOC 121 – Hydrogen pipelines,
  • ISO 14687 – Hydrogen fuel quality,
  • ISO 19880 – Gaseous hydrogen – Fuelling stations.

Examples of R-PUR Hydrogen Purification Systems

R-PUR.D.20.34.CC

  • Oxygen removal module (Deoxo): D – includes oxygen removal module
  • Hydrogen flow: 20 Nm³/h
  • Design pressure: 34 barg
  • Regeneration circuit: CC – Closed circuit (no hydrogen loss)

R-PUR.X.100.15.OC

  • Oxygen removal module (Deoxo): X – does not include oxygen removal module
  • Hydrogen flow: 100 Nm³/h
  • Design pressure: 15 barg
  • Regeneration circuit: OC – Open circuit

R-PUR.D.500.40.OC

  • Oxygen removal module (Deoxo): D – includes oxygen removal module
  • Hydrogen flow: 500 Nm³/h
  • Design pressure: 40 barg
  • Regeneration circuit: OC – Open circuit

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