Compression and liquefaction unit for measuring impurities in the CO2
13 Pages Posted: 22 Nov 2022
Date Written: November 21, 2022
A new CO2 Compression and Liquefaction Unit (CCLU) for measuring impurities in the CO2 product has been built, commissioned, and connected to the CO2 capture pilot plant at SINTEF. The unit will be used to measure impurities in the CO2 after compression and drying at conditions relevant to CO2 shipping or transport. The CCLU has been designed with components like an industrial-sized unit, with three compressor stages including cooling and condensate knock-out drums. After being compressed to 35 - 40 bar, the CO2 gas is dried and then cooled down and liquefied at -5 to -10 °C by an external cooler. The liquefied CO2 is then expanded to 16 bars through an expansion valve and stored at -24.4 °C in a storage tank.
Liquid samples are taken from the knock-out drums whilst gas samples are extracted upstream of the external cooler. It is also possible to take a sample of the gas out of the storage tank. In a short test campaign with 30 wt% MEA, the CCLU has shown to operate well and have a fast response to steady-state conditions.
Keywords: CO2 Compression and Liquefaction; Chemical Absorption; Carbon Capture; MEA
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