Modelling and parameter estimation of breakthrough curves for amine-modified activated carbons under pre-combustion carbon capture conditions
| Autor: | Rebeca A. Azpiri Solares, Douglas Soares dos Santos, Joseph Wood, Andrew Ingram |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Hydrogen
020209 energy General Chemical Engineering Organic Chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Separation process Pressure swing adsorption chemistry.chemical_compound Fuel Technology Adsorption 020401 chemical engineering chemistry Chemical engineering Integrated gasification combined cycle Carbon dioxide 0202 electrical engineering electronic engineering information engineering medicine Amine gas treating 0204 chemical engineering Activated carbon medicine.drug |
| Zdroj: | Fuel. 253:1130-1139 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2019.05.095 |
| Popis: | Pressure swing adsorption (PSA) demonstrates high potential for capturing pre-combustion carbon dioxide in Integrated Gasification Combined Cycle (IGCC) power plants, due to a binary mixture of hydrogen and carbon dioxide entering the separation process. In this work, a seven-step PSA model was developed and compared to adsorption experiments under PSA conditions (25 bar and ambient temperatures) performed with tetraethylenepentamine (TEPA) and a novel blend of monoethanolamine-monodiethanolamine (MEA-MDEA) modified activated carbons, using nitrogen and carbon dioxide mixtures. The MEA-MDEA modified activated carbon showed promising results for pre-combustion PSA processes, due to their high carbon dioxide adsorption capacity and delayed break-point of about 200 s compared to the unmodified activated carbons. A sensitivity analysis carried out for the adsorbent parameters in a seven-step PSA process showed that high mass transfer coefficient values yielded to highly purified products, specifically for the light product stream (99.4%). A sensitivity analysis of the process variables showed that purity values of the heavy stream (carbon dioxide) were over 90% when the purge pressure was reduced to 0.5 bar and the carbon dioxide feed fraction increased to 60%. |
| Databáze: | OpenAIRE |
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