The increase in carbon dioxide (CO2) emissions has driven the development of mitigation technologies, with Bioenergy with Carbon Capture and Storage (BECCS) standing out as a promising alternative for achieving negative emissions. Among the available technologies, chemical absorption using amines presents a high level of industrial maturity. In this context, this study performed a technical and economic assessment of CO2 capture from the flue gas of a sugarcane bagasse–fired boiler with a flow rate of 200 t/h, corresponding to a steam production of 100 t/h. Monoethanolamine (MEA) and diethanolamine (DEA) were evaluated as solvents through simulations carried out in Aspen Plus®, considering both absorption and desorption stages. The results indicated a capture efficiency of 90% and a CO2 purity of 99%. The optimal liquid-to-gas mass ratio was 2. 5 for MEA and 3. 25 for DEA, corresponding to loadings of 0. 30 and 0. 40 mol CO2/mol solvent, respectively. The reboiler energy requirements were 4. 4 and 4. 8 GJ/tCO2. The economic analysis indicated a CAPEX between 6. 7 and 7. 6 MUS/year and an OPEX between 19 and 20 MUS/year, resulting in capture costs ranging from 81 to 88 US/tCO2. The results confirm the technical feasibility of the process and the superior economic performance of MEA under the evaluated conditions.
Costa et al. (Mon,) studied this question.