Technology

A ground-breaking technology

Transforming biogas into bio-LNG and liquid bio-CO2.
Cryo Pur designs, manufactures, commercializes and services a range of equipment for cryogenic biogas upgrading, biomethane liquefaction and bio-CO2 liquefaction.

A ground-breaking technology

The Cryo Pur technology opens new opportunities for the biogas sector:

  • production of fuel for heavy goods vehicles (bio-LNG),
  • production of biomethane from landfill gas,
  • remote injection/combustion of biomethane,
  • production of liquid bio-CO2.

The Cryo Pur system is adapted to treat biogas produced from any type of organic waste:

  • agricultural waste,
  • industrial waste,
  • waste water sludge,
  • household waste

An integrated process

An integrated process

1

Pretreatment : H2S, water and pollutant removal

• Incoming biogas is first treated with activated carbon filters to remove hydrogen sulfide (H2S).
• Biogas is then cooled to -40°C for a first dehumidification step by alternately frosting and defrosting water on two heat exchangers; Volatile Organic Compounds and siloxanes are removed together with water.
• Biogas is then cooled to -75°C for a second, similar step of dehumidification and pollutant removal.

2

CO2 capture : separation and liquefaction of CO2

The dry, pre-treated biogas is cooled to -120 °C, so that CO2 is captured through alternate frosting and defrosting on two heat exchangers, which ensures that biomethane reaches the required purity for liquefaction. During this step, pure CO2 is recovered in liquid form, in order to be directly usable as a product.

3

Liquefaction of biomethane

Biomethane is then compressed to 15 bar and liquefied at -120°C. The bio-LNG product is finally stored in a cryogenic vessel. If needed, a boil-off and re-liquefaction loop allows to produce bio-LNG at 2 bar and -160°C.

Integrating these different steps into one system allows to:
• reach a minimal electricity consumption for the complete process,
• avoid risks associated with interfacing different technologies

Unmatched performances

Recovery rate

Recovery rate

The Cryo Pur process ensures a maximum recovery rate when transforming raw biogas into biomethane: there is no loss of biomethane in the process.
For landfill gases (LFG) with high nitrogen and oxygen content, the loss of biomethane is only 1%.

Reliability

Reliability

Thanks to a robust design and to an entirely automated operation, Cryo Pur units reach a yearly availability above 95%.

Power consumption

Power consumption

The electrical energy consumption is minimum, thanks to combining cryogenic upgrading and liquefaction, which leverages synergies in the production of low temperatures.

Biomethane purity

Biomethane purity

Liquid biomethane produced by the Cryo Pur system is more than 99% pure; it complies with Vehicle Gas standards and meets the requirements for LNG logistics as well as for injection into the natural gas grid.

Liquid bio-CO2 purity

Liquid bio-CO2 purity

Liquid bio-CO2 produced by the Cryo Pur system is ready to be transported in liquid form or transformed on-site. With a purity above 99,9%, it complies with the norm of the European Industrial Gases Association (EIGA).

Heat recovery

Heat recovery

The Cryo Pur process enables to recover a significant quantity of heat from the refrigeration systems, enough to cover entirely the heating needs of the digesters which produce the biogas upstream.

Flexibility

Flexibility

Cryo Pur units can treat between -50% and +20% of the nominal biogas flow rate while maintaining their performance.

Service

Service

In order to guarantee the performance of its units over time, Cryo Pur offers « full service » maintenance contracts with guarantee of availability and replacement of spare parts.

A patented technology

Cryo Pur technology results from 15 years of R&D led by Denis Clodic and its team from Mines ParisTech in the field of cryogenic CO2 capture.
Technological innovation is at the heart of Cryo Pur: protected by 7 worldwide patents, Cryo Pur technology offers concrete solutions to the issues surrounding biogas, employing cutting-edge processes to push the limits of energy efficiency.

A patented technology

A broad product range

Cryo Pur technology is adapted to biogas projects with flows ranging from 70 Nm3/h to 2 000 Nm3/h raw biogas.

Product Nominal biogas flowrate (Nm3/h) Minimal biogas flowrate (Nm3/h) Maximal biogas flowrate (Nm3/h) Nominale bio-LNG production* (t/d) Nominale bio-CO2 production* (t/d)
CP 70 70 35 85 0,6 1,3
CP 150 150 75 180 1,3 2,8
CP 250 250 125 300 2,3 4,7
CP 500 500 250 600 4,6 9,4
CP 800 800 400 960 7,4 15,1
CP 1000 1000 500 1200 9,2 18,9
CP 1500 1500 750 1800 13,8 28,4
CP 2000 2000 1000 2400 18,5 37,9

* Production is calculated for a biogas composition of 55% CH4 and 45% CO2