| Abstrakt: |
The cement industry generates 7 % of global anthropogenic CO2emissions, and carbon capture, utilization and storage is one of the most promising technologies to decarbonise the cement manufacturing process. However, it requires specific in-depth techno-economic and environmental analysis to explore different pathways for its implementation in distinct contexts. This paper develops a methodological framework that responds to this challenge, which includes a multi-criteria assessment (with environmental, technical, and economic considerations), and demonstrates its use in a case study to select the most viable CO2capture technology to be implemented in a Portuguese cement plant. Three technologies were analysed: monoethanolamine (MEA), calcium looping (CaL) post-combustion, and oxyfuel. A reference cement plant without CO2capture was studied to establish a baseline. The systematic analysis of these technologies’ implementation to the cement plant, combined a life cycle assessment and techno-economic assessment, which were integrated with an analytic hierarchy process, and a weighted sum model, reflecting the inputs from the stakeholders. Three scenarios that reflect the feasibility of the CO2capture unit implementation (worst, intermediate, and best-case) were compared for each of the alternatives. The results show that, regardless of the scenario, CaL has the highest rank among the three CO2capture technologies. Still, the rank order regarding the reference cement plant depends on the scenario adopted. In the worst scenario, the reference plant presents the highest overall rank, while for the remaining scenarios, CaL has the highest score. In the best scenario, all the technologies present a higher ranking compared to the reference. |
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