FLUIDIZED BED CALCIUM LOOPING CYCLES FOR CO_2 CAPTURE: A COMPARISON BETWEEN DOLOMITE AND LIMESTONE

摘要

CO_2 capture and attrition behavior of a dolomite were studied during calcium looping cycles in a lab-scale fluidized bed. Results were compared to those obtained with six limestones in similar tests. The experiments were carried out under conditions representative of a process with calcination in an oxy-firing environment (T = 940°C, CO_2 = 70%_(v/v)), with or without the presence of SO_2. Results showed that the CO_2 capture capacity of the dolomite was larger than that of the limestones, in spite of the lower calcium content of the sorbent. The presence of SO_2 depressed the sorbent CO_2 capture capacity. Contrary to the limestones, the dolomite was subject to extensive attrition and fragmentation.