Techno-economic assessment of the multi-absorber approach at an industrial site with multiple CO2 sources

Abstract

To meet the goals of the Paris Agreement, decarbonization across all sectors, including industrial facilities with multiple CO₂ emission sources, is essential. Post-combustion capture, despite its high energy demands, is a promising technology for reducing carbon emissions. This study explores the feasibility of CO₂ capture using a multi-absorber/combined-stripper system at an industrial refinery. CO₂ capture was modeled using 30 wt.% MEA for four stacks, optimizing each to minimize energy use while achieving 95 % capture. The study also examines CO₂ capture costs, operational expenses, and unit size requirements.

Results indicate that the multi-absorber/combined-stripper configuration required less solvent and had lower reboiler duties compared to individual absorber setups, though it required higher initial investment for larger equipment. Compared to flue gas mixing, the multi-absorber/combined-stripper system had higher equipment costs but lower operating expenses. While flue gas mixing had lower equipment costs, it incurred significantly higher transportation costs depending on the distance between sources and the capture site.

A sensitivity analysis on packing and steam costs showed that a 50 % reduction in packing costs could lower capital expenses by 10–30 %, while reduced steam costs could cut operating expenses by 25 %. This analysis highlights areas where cost reductions could make CO₂ capture more economically viable.