The temperature and composition of the flue gas were measured duplicate twice with an interval of 3 hours during the period of CO2 scrubbing. The flue gas was analyzed for the main components of N2, CO2 and O2 with a GC (7890A, Agilent Technologies, USA) equipped with a thermal conductivity detector and a CTR1 double column (Alltech, USA), where helium was used as carrier gas. Additionally, the NOx and CO concentrations were measured periodically as part of environmental measurements by Dansk Gasteknisk Center a/s.