In Switzerland, CO2 Energie AG has commissioned compatriot Hitachi Zosen Inova AG (HZI) to construct an installation to separate and liquefy renewable carbon dioxide (CO2) at an existing biogas plant in Nesselnbach. This renewable by-product will be made available for industrial purposes, avoiding the use of fossil CO2, thus contributing to global climate change mitigation and decarbonization efforts in a pilot project showing a path into the future.
HZI has been awarded the contract to engineer and deliver a turnkey plant to liquefy carbon dioxide (CO2) naturally resulting from an organic digestion plant in Nesselnbach (Canton Aargau). The client, CO2 Energie AG, will take the CO2 that has been separated from the biogas in the upgrading plant and prepare it for industrial applications – carbon capture and utilization (CCU).
For the visionaries in Nesselnbach, this project has both environmental and economic advantages. Upgrading existing biogas plants with CO2 liquefaction is a pioneering project for plant operators that also pay off monetarily by serving other sectors of the economy, making it fully circular.
The existing biogas plant at the site has until now produced biogas, which is upgraded into biomethane (aka renewable natural gas – RNG) for injection into the regional natural gas grid. The biogas upgrading process entails removing the CO2 contained in the biogas from the biomethane.
The pilot project aims to capture and liquefy the CO2 from the biogas upgrading process for use as product gas in various industrial applications, for example as technical welding gas, in gas extinguishing systems, or for inerting. The HZI liquefaction plant will have a CO2 processing capacity of 4 000 tonnes per annum.
HZI is developing the plant as a compact, container construction that will liquefy the high-purity product gas and inject it into storage tanks.
According to HZI, the pilot project marks an important step forward in its Renewable Gas business. The business unit already provides biogas and gas upgrading technologies, making it a partner with a wealth of experience in all the work involved, including comprehensive expertise in the relevant interfaces – a key advantage the company says when it comes to integrating equipment into the overall concept.