The development of a framework to compare carbon capture and storage technologies as a means of decarbonizing cement production

Cement production is hard to abate given that energy-efficiency measures and fuel switching have no impact on process emissions and a limited impact on total greenhouse gas emissions. Alternative cements and decarbonized raw materials can reduce process emissions; however, complete decarbonization requires carbon capture. Yet, most decarbonization roadmaps and studies generalize carbon capture without acknowledging differences between the technologies or regions in which they are implemented. To address this gap, we developed a bottom-up technology-explicit model of the cement sector to compare six technologies: chemical absorption, physical adsorption, membrane absorption, calcium looping, partial oxyfuel technology, and full oxyfuel technology. We explored energy and greenhouse gas impacts, capital costs, non-energy operating costs, energy costs, and carbon costs. A case study for Canada demonstrated that carbon capture technologies can be implemented at emissions abatement costs of −22 to 1 CAD/t CO₂e, accounting for carbon price credits. Our findings show that energy can account for up to 81 % of the total costs, eroding the benefit of avoided carbon costs and increasing sensitivity to energy prices. However, carbon pricing still strongly influences the economics of carbon capture technologies and a minimum carbon price of 90 CAD/t CO₂e by 2030 ensures carbon capture remains economical across Canada. The developed framework can used globally to help develop policy formulation and inform investment.