RELEVANT INFLUENCE OF CALCIUM PRECURSORS ON CO2 CAPTURE PERFORMANCE OF COAL FLY ASH STABILIZED, CAO-BASED SORBENTS

摘要

CO2 capture and storage (CCS) has been identified as a promising mid-term strategy for mitigation of the continuous increase in atmospheric CO2 concentrations, which contributes significantly to global warming and climate change. Generally, the process of CO2 capture accounts for 50%-80% of the total cost in CCS, thus it is necessary to develop applicable CO2 capture methods from both technical and economic points of view. The calcium looping, based on carbonation-calcination cycles of CaO-based sorbents, exhibits a number of advantages for its high theoretical capacity of 0.78 g(CO2) g(CaO)~(-1) and low costs of CO2 avoided (estimated at $29 tCO2~(-1)). Additionally, it has wide applicability to energy storage systems through chemical heat pumps and enhanced hydrogen production through steam methane reforming.