Abstract. Ca-looping is a potentially effective method for CO 2 capture from coal fired power plants. In this work, using a custom made tube furnace experimental system that can measure sample weight changes at constant temperatures, water vapor effect on calcination and carbonation of calcium based CO 2 sorbent are studied. The effects of steam present in calcination and carbonation process is determined. It is found that steam has a positive overall effect on CO 2 capture in the Ca-looping process. When present in both calcination and carbonation processes, steam can increase the decomposition rate of the CaCO 3 and enhance the subsequent carbonation conversion of the calcined CaO.
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