Technology

Process, system sizes and production quantities

The process

1

Pretreatment:
Cleaning the gas

In the pretreatment stage, the raw biogas is cooled and cleaned of pollutants such as H2S and VOCs with the help of activated carbon beds.

2

Biogas upgrading:
Separation of methane and CO₂

Based on the membrane process, CO₂ diffuses through the surface of the membrane faster than CH₄ under pressure. In the 3-stage process, it is possible to recover >99% of the CH₄.

3

Fine cleaning and liquefaction
From biomethane

Fine purification makes it possible to achieve the biomethane specifications necessary for liquefaction. A molecular sieve adsorbs residual H2O and CO₂ before the biomethane is compressed to 100 bar and expanded and cooled down in several stages through Joule-Thomson valves.

4

Liquefaction
of carbon dioxide from the waste gas stream of the biogas upgrading process

The CO₂-containing waste gas stream from biogas upgrading can be cleaned, dried and liquefied in a further process step.

5

Storage:
Tank loading system

In a double-walled vacuum-insulated tank, the approx. -150°C cold Bio-LNG is temporarily stored until calibrated loading.

Structure of our liquefaction plant

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Plant sizes and production quantities

The “Green Line Liquid” solution can be modularly extended to any biogas production volumes. We are thus creating a standard solution to ensure the supply of spare parts and therefore can provide a safe operation.

Plant size
(equivalent power in kWel)*
Biogas production
(Nm³ per hour)**
Biomethane production
(Nm³ per hour)
Bio LNG production
(t per day)
Bio CO2 production
(t per day)
550 290 160 2,5 5,0
700 335 190 3,0 6,0
1.000 500 275 4,5 9,0
1.400 675 365 6,0 12,0
1.700 840 455 7,5 15,0
2.000 1.000 545 9,0 18,0
2.700 1.335 725 12,0 24,0
3.400 1.675 965 15,0 30,0
4.000 2.000 1.050 18,0 36,0

*We can supply equipment for any production quantity.
**Biogas stream at a methane content of 55.5%.

Time-lapse footage of the construction of the Bio-LNG plants

Construction of Germany’s first bio-LNG plant in Darchau

Time-lapse recording of the construction of our energy-efficient, modular and decentralized technology for the processing and liquefaction of biomethane and carbon dioxide

Source: Perspektive Media

Construction of Brandenburg’s first bio-LNG plant in Parmen

Time-lapse recording of the construction of our energy-efficient, modular and decentralized technology for the processing and liquefaction of biomethane and carbon dioxide

Source: Perspektive Media GmbH

Customer testimonials

“The consulting, planning and implementation with RUHE Biogas was super, and after a short time we could already see the positive effects in the entire biogas process.”

Gregor Gerwin, Bioenergy Gerwin Produktions GmbH & Co.KG, 49692 Cappeln

“Especially when it comes to marketing the bio-LNG, RUHE Biogas’ expertise and transparency has helped me a lot to realize the true value of my biogas.”

Dirk Huster-Klatte, HK Bioenergie GmbH, 49688 Lastrup

“Kunibert Ruhe already sold us a biogas plant back then, and we are still very satisfied today. Now we are starting bio-LNG production with RUHE Biogas – for us there is no better partner.”

Bernhard Siemer, Josef Siemer Biogas Verwaltungs GmbH, 49429 Visbek

Would you like to learn more about our technology?

We would be pleased to support you in the preparation of a feasibility study. This includes a profitability calculation based on your substrate mix, gas composition, vessel volumes, and energy sources used.