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Effects of flow pattern on CO₂ capture using potassium carbonate in circulating fluidzed bed |
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| รหัสดีโอไอ | |
| Title | Effects of flow pattern on CO₂ capture using potassium carbonate in circulating fluidzed bed |
| Creator | Or-ampai Jaiboon |
| Contributor | Pornpote Piumsomboon |
| Publisher | Chulalongkorn University |
| Publication Year | 2554 |
| Keyword | Carbon dioxide mitigation, Carbon dioxide -- Absorption and adsorption, Fluidization, Fluid dynamics, Fluidized reactors, คาร์บอนไดออกไซด์ -- การลดปริมาณ, คาร์บอนไดออกไซด์ -- การดูดซึมและการดูดซับ, ฟลูอิไดเซชัน, พลศาสตร์ของไหล, เครื่องปฏิกรณ์แบบฟลูอิไดซ์, ปริญญาดุษฎีบัณฑิต |
| Abstract | To investigate the effect of flow pattern/regime in fluidized bed/circulating fluidized bed on CO₂ capture from flue gas, released from a fossil fuel combustion process, at low temperature 60℃ using potassium carbonate supported on alumina (K₂CO₃/Al₂O₃) solid sorbent prepared by impregnation method. The semi-circulating fluidized riser made from glass has 0.025 m of inner diameter and 0.80 m of height. The flow pattern/regime was characterized by measuring pressure fluctuation in the riser. It can be divided into five different flow patterns/regimes including fixed bed, multiple bubbling, slugging, turbulent and fast fluidization as gas velocity increased. The fixed bed and multiple-bubbling bed could adsorb all CO₂ in flue gas (CO₂ removal fraction = 1). The slugging, turbulent and fast fluidization could not remove all CO₂ in flue gas. Maximum CO₂ removal fractions for slugging, turbulent and fast fluidization are 0.98, 0.94 and 0.72, respectively. However, the turbulent regime provides the best CO₂ capture capacity at about 90% of stoichiometic theoretical value. The CO₂ capture capacity for the multiple-bubbling and fast fluidization regimes are secondary with about 66-72% of stoichiometic theoretical value. The fixed bed and slugging regimes provide the poorest CO₂ capture capacity at about 53-60% of stoichiometic theoretical value. For K₂CO₃/Al₂O₃ solid sorbent, this solid sorbent was completely regenerated for temperature higher than 300℃ resulting in higher stability to maintain capacity. |
| URL Website | cuir.car.chula.ac.th |
