期刊
FUEL PROCESSING TECHNOLOGY
卷 227, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2021.107099
关键词
Oxygen carrier; Chemical looping combustion; Alkali; Surface ionization detector
资金
- Swedish Research Council [2016-06023]
- Swedish Research Council [2016-06023] Funding Source: Swedish Research Council
The study investigates the interactions between alkali and an oxygen carrier in Chemical-Looping Combustion (CLC) to better understand the fate of alkali in the process. Results show that alkali uptake is limited under oxidizing conditions but significant during stable reducing conditions.
Chemical-Looping Combustion (CLC) of biofuels is a promising technology for cost-efficient CO2 separation and can lead to negative CO2 emissions when combined with carbon capture and storage. A potential challenge in developing CLC technology is the effects of alkali metal-containing compounds released during fuel conversion. This study investigates the interactions between alkali and an oxygen carrier (OC), CaMn0.775Ti0.125Mg0.1O3-delta, to better understand the fate of alkali in CLC. A laboratory-scale fluidized bed reactor is operated at 800-900 degrees C in oxidizing, reducing and inert atmospheres to mimic CLC conditions. Alkali is fed to the reactor as aerosol KCl particles, and alkali in the exhaust is measured online with a surface ionization detector. The alkali concentration changes with gas environment, temperature, and alkali loading, and the concentration profile has excellent reproducibility over repeated redox cycles. Alkali-OC interactions are dominated by alkali uptake under most conditions, except for a release during OC reduction. Uptake is significant during stable reducing conditions, and is limited under oxidizing conditions. The total uptake during a redox cycle is favored by a high alkali loading, while the influence of temperature is weak. The implications for the understanding of alkali behavior in CLC and further development are discussed.
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