Modelling and Analysis of the CO2 Post-Combustion Capture Process
Author
Cheungoue, Serge
Term
4. term
Education
Publication year
2008
Abstract
This thesis investigates carbon capture and storage (CCS) by building a computer flowsheet model of post-combustion capture, which removes CO2 from flue gas after fuel is burned. The goal is to estimate energy use, possible costs, and how effectively the process could cut CO2 emissions. The study also reviews other capture methods to compare their economic feasibility. Using the PRO/II process simulator and the amine thermodynamics package, the model represents an absorber and a regenerator (stripper). The solvent is 96% water and 4% monoethanolamine (MEA), a common amine used to absorb CO2. For a flue gas containing 14% CO2, 80% N2, and 6% O2, the simulation produced a CO2-rich stream with 65.46% purity that was saturated with water. MEA usage was reported as 0.19% in the model. The absorber operated between 32 and 43.4 °C at 18 atm, while the regenerator ran between 70 and 106.1 °C at 1 atm. According to the overall heat balance of the absorber and stripper, the process generated more energy than it consumed in the simulation, which matters because CO2 capture is usually energy-intensive.
Dette speciale undersøger carbon capture and storage (CCS) ved at opbygge en computerbaseret flowsheet-model af efterforbrændingsfangst, som fjerner CO2 fra røggas efter forbrænding. Målet er at estimere energiforbrug, mulige omkostninger og hvor effektiv processen kan være til at reducere CO2-udledninger. Studiet gennemgår også andre fangstmetoder for at sammenligne deres økonomiske gennemførlighed. Med procesprogrammet PRO/II og en amin-termodynamikpakke modelleres en absorber og en regenerator (stripper). Opløsningsmidlet er 96% vand og 4% monoethanolamin (MEA), en almindelig amin til at absorbere CO2. For en røggas med 14% CO2, 80% N2 og 6% O2 gav simuleringen en CO2-rig strøm med 65,46% renhed, mættet med vand. MEA-forbruget var angivet som 0,19% i modellen. Absorberen arbejdede mellem 32 og 43,4 °C ved 18 atm, mens regeneratoren kørte mellem 70 og 106,1 °C ved 1 atm. Ifølge den samlede varmebalance for absorber og stripper producerede processen mere energi, end den forbrugte i simuleringen, hvilket er vigtigt, fordi CO2-fangst normalt er energikrævende.
[This apstract has been rewritten with the help of AI based on the project's original abstract]