Validation of a compression and liquefaction unit for measuring impurities in CO2
A new CO2 Compression and Liquefaction Unit (CCLU) that measures impurities in CO2 has been built and connected to SINTEF's CO2 capture pilot plant in Trondheim, Norway.
Impurities, such as sulphur oxides, nitrogen oxides, carbon monoxide and amines, may have a negative impact on pipeline transportation and storage, and limit the potential uses of CO2. Thus, being able to assess the quality of CO2product is crucial for de-risking full-chain CCUS implementation.
The CCLU mimics the industrial-sized unit comprising three compressor stages, each including cooling and condensate knock-out drums, and can process 10-20 kg/h CO2. The new CCLU rig can be used to measure impurities in CO2 after it has been compressed to 35-40 bar, dried, cooled down and liquefied at conditions relevant to CO2 shipping or transport.
Gas samples can be extracted after the dryers before the liquefaction, and liquid samples can be extracted after each compressor stage for analyses.
A test campaign using aqueous monoethanolamine (MEA) solvent at 30 wt% has demonstrated the safety and efficacy of the CCLU.
Mejdell, Thor and Hjarbo, Kai and Hovdahl, Lars and Chikukwa, Actor and Kim, Inna, Compression and liquefaction unit for measuring impurities in the CO2 (November 21, 2022)