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Assessment of CO₂ capture technologies in cement manufacturing process

Vatopoulos, Konstantinos, Tzimas, Evangelos
Journal of cleaner production 2012 v.32 pp. 251-261
calcium, carbon dioxide, cement, energy, energy recovery, manufacturing, models, raw materials, specific energy
In this paper, an assessment of the viability of 3 CO₂ capture technologies for the cement industry is performed; post-combustion absorptive capture (MEA) and oxy-combustion options are concepts already used by other industries and currently explored by the power sector; calcium looping post-combustion capture technology (CL) is an emerging technology that has not been assessed before in a comparative manner. The comparison is carried out in terms of specific energy consumption, CO₂ footprint, CO₂ capture energy penalty, raw material consumption and energy recovery potential. This has been achieved through the modelling of the integration of these process concepts with a reference cement plant. The results show that for the same capture efficiency (85%), calcium looping has an advantage as the specific energy consumption increases by 18%. In the case of MEA the increase is 45%. CL also has considerably higher energy recovery potential, which can also further reduce its CO₂ footprint. However, chemical looping demonstrates a higher complexity of integration with an existing cement plant. Oxy-combustion, though showing lower capture efficiency (60%), results in lower specific energy consumption than the base case cement plant, which results to a negative CO₂ capture penalty. These results contribute to the identification of the most suitable CO₂ reducing strategy for the cement industry.