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IEA Greenhouse Gas R&D Programme

67 Jasmin aThe dehydration step is a small part within the full CO2 capture and storage chain yet this unit plays an important role in maintaining the integrity of the system. In the past, this step usually appeared as a black box process, with little information available on its detailed design. However, the conventional drying technologies face a number of challenges that need consideration before full-scale deployment.
IEAGHG commissioned AMEC to carry out this study in order to examine the characteristics of the various drying processes and their integration into the CCS system. This work evaluates dehydration processes that are able to reach water contents ranging from 600ppmv down to <10ppmv. It considers a range of flow rates, constraints on the dehydration pressure and the range of other substances in the CO2 gas.
Key messages from the report:

Areas requiring further work include the effects of inerts and impurities on physical properties and the development of acid resistant solid desiccants to cater for the impurities present in feed gases. IEAGHG will continue to track research and project activities in these areas.