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Behavior of Dolomites under Fluidized Bed Sorption-Enhanced Gasification Conditions
Antonio Coppola1, Fiorella Massa1, Fabrizio Scala1,2,3
1Institute of Sciences and Technologies for Sustainable Energy and Mobility (STEMS), National Research Council (CNR), Piazzale Vincenzo Tecchio 80, 80125 Naples, Italy.
Industrial & Engineering Chemistry Research
|March 17, 2025
Summary
This study shows that steam improves CO2 capture in dolomite during gasification, though dolomites fragment more than limestones. Elutriation is higher during calcination and reduced by steam.
Area of Science:
- Chemical Engineering
- Materials Science
- Energy Conversion
Background:
- Sorption-enhanced gasification is key for producing hydrogen-rich syngas.
- Dolomite's performance as a sorbent requires detailed investigation.
Purpose of the Study:
- To investigate dolomite behavior during sorption-enhanced gasification.
- To evaluate the impact of operating conditions, particularly steam, on dolomite performance.
- To compare dolomite and limestone behavior in fluidized bed systems.
Main Methods:
- Lab-scale experiments using Italian and Polish dolomites subjected to 10 calcination/carbonation cycles.
- Variable carbonation temperatures (600-700 °C) with and without water vapor.
- Analysis of CO2 capture capacity, fragmentation, and elutriation.
Main Results:
- Steam positively influences dolomite CO2 capture capacity.
- Elutriation rates are higher during calcination than carbonation and are negatively affected by steam.
- Dolomites exhibit comparable CO2 capture to limestones but have a more fragile structure, leading to increased fragmentation.
Conclusions:
- Dolomite is a viable sorbent for enhanced gasification, with steam enhancing its CO2 capture.
- Operating conditions significantly impact sorbent stability and efficiency.
- Understanding fragmentation is crucial for optimizing fluidized bed reactor design with dolomites.
