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The latest project of Krieg & Fischer Ingenieure shows the installation of a CO₂ liquefaction plant in combination with a biogas upgrading plant for two existing biogas plants of LSW Energie GmbH.

The investor's goal is to transform its grid infrastructure into a sustainable energy system with sector coupling. The biogas upgrading plant will be renewed and includes the installation of a plant for upgrading biogas to biomethane and food-grade CO₂ liquefaction. The biomethane produced will be injected into the local natural gas grid, while the captured CO₂ will be liquefied and sold. The production of liquefied CO₂ will be about 1.1 t/h, and it is also planned to produce Dry Ice. The integration of biogas upgrading and CO₂ liquefaction will be carried out by Krieg & Fischer Ingenieure GmbH.

Exciting and more detailed information about the project can be read in the recently published issue of Bioenergy Insight magazine, in which an article by our project engineer Tobias Eckhof on this topic has now been published. Furthermore, the article rounds up these exciting insights into the project with separations and liquefaction of C0₂ and its application purpose.

The process of CO₂ liquefaction is well established and already used in the brewing industry. However, in the biogas sector, liquefaction of CO₂ is still relatively new. In biogas upgrading, CO₂ is collected from the biogas, purified and liquefied. Depending on the technology used, the separated CO₂ stream is already of high quality. Liquefaction can further increase the quality, and the methane in the CO₂ stream can be recycled back to the upgrading plant to achieve near full methane recovery.

CO₂ can be used in various sectors, such as food and beverage, agriculture, medicine, etc. Biogas plants are a source of biogenic CO₂ that is contained in the natural carbon cycle and thus can help reduce greenhouse gas emissions.

The focus of many biogas projects to date has been on the use of methane (see News) as the primary energy component. However, with the increasing use of biomethane from biogas, the carbon dioxide (CO₂) emissions produced during biogas upgrading can also be used effectively.

More on the topic of CO₂ liquefaction can be found soon in the Biogas Journal, in which an exciting article will be published in cooperation with Krieg & Fischer Ingenieure. This will be linked here for publication.

Do you want to know more about methanation? On our Youtube channel you can now find a video worth watching on the topic of methanation.

You can find further publications under:
Publications - Krieg & Fischer GmbH

THIES, R.  2023
Interview with Raphael Thies (Krieg & Fischer Ingenieure)
Easy Engineering International, March 2023

FISCHER,T. and LATINOVIC S. 2022
Technical Challenges in Biogas/BiomethanePlants for Production of Biofuels
Advanced Biofuel Forum, Amsterdam 30.11-01.12.2022

THIES, R; GUENTHER, C. and LATINOVIC S. 2022
Showcase projects by Krieg & Fischer in 2021/2022
In Biogas World Showcase Report, edition September 2022, S. 86

What is Bioenergy Insight?

Founded in 2010, Bioenergy Insight is a magazine that has quickly built a reputation for providing high-quality news, analysis, market intelligence, and technical articles about the biomass, biogas, and bioenergy industries. In each issue, you'll find the latest industry news, the latest technical developments, exclusive interviews with plant operators, an in-depth analysis of a specific region, and a full range of technical articles.