Study of Composite Sorbent Pellets for Integration of Calcium Looping and Chemical Looping Combustion.

摘要

Carbon capture and storage (CCS) technologies were developed to address the problem of increasing CO2 emissions. Two of the most promising technologies are calcium looping (CaL) and chemical looping combustion (CLC). The integration of CaL and CLC has been studied in this thesis with CuO/CaO composite sorbent pellets. The pellets were tested over multiple cycles and the stability in terms of chemical looping combustion was excellent, although agglomeration was observed. In contrast, a significant decay in the rate of CO2 uptake was observed in the first 3-4 cycles. Both a thermal pretreatment and the presence of steam enhanced the stability, while the addition of potassium hydroxide hindered the performance. Steam will be present with the flue gases in an industrial application, and so it is important that steam did not detract from the performance of the pellets.