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Techno-Economic Assessment of New Solvents for CCS

Gas fired power plants will likely remain part of the future energy mix and chemical solvent based post-combustion CO2 capture offers a way of decarbonizing this type of electricity generation. In this study, we present a techno-economic assessment of five solvents, including two new proprietary solvents, applied in an archetypal capture plant treating a flue gas stream with 4mol% CO2. The solvents’ performance is compared using a reduced order modeling technique with partial optimization of process parameters and parametric equipment cost estimation. The CO2 loading in the lean solvent returned to the absorber is varied in each case to find the lowest total annualised cost for each solvent. The estimated total annualised costs range from $100 per ton of CO2 down to $76 per ton of CO2.