Results from Testing of Aker Solutions Advanced Amine Solvents at CO2 Technology Centre Mongstad

Abstract

Abstract The overall objective of the test program at CO2 Technology Centre Mongstad (TCM DA) is to verify Aker Solutions’ Advanced Carbon CaptureTM process including two proprietary advanced amine solvents, ACCTM-solvents S21 and S26. Also a short benchmark campaign is conducted with 30% MEA solvent in order to establish a reference. Key performance results are presented for MEA, S21 and S26. Close to 10 000 hours of operation of the TCM DA amine plant was obtained in the three campaigns, with high availability, showing that there are no operational issues related to the S21 and S26 solvents. Optimum SRD for 30 wt% MEA was found to be 3.8 MJ/kg CO2 when capturing CO2 from CHP gas with CO2 concentration 3.4-4.0% and CO2 capture rate of 87%. SRD was found to be approximately 10% lower for ACCTM advanced solvents S21 and S26. SRD values down to 3.4 MJ/kg CO2 was obtained for CHP flue gas with CO2 concentrations below 4 vol% and 87% capture without heat integration or use of ACCTM Energy Saver. Emissions to atmosphere using ACCTM emission control system were shown to be very low for solvent amines and alkyl amines, with measured levels below 0.1 mg/Nm3 in total. Emission of nitrosamines and nitramines were all below analytical detection limits typically around 0.1 μg/Nm3. Solvent amine losses have been quantified to approximately 2.6 kg amine/ton CO2 captured for MEA, 0.5-0.6 kg amine/ton CO2 captured for ACCTM advanced solvent S21, and 0.2-0.3 kg amine/ton CO2 captured for ACCTM advanced solvent S26. Successful reclaiming of ACCTM advanced solvents S21 and S26 was performed towards the end of the campaigns. Reclaiming was performed for validation purposes and not due to any indications of critical loss of solvent performance, high emissions, high viscosity or other operational problems that could be an indication of excessive degradation. No operational problems such as precipitation or fouling were encountered during reclaiming. HSS and most impurities and degradation products were removed from the solvent by more than 80%.