Combustion characteristics of lignite char in a fluidized bed under O2/N2, O2/CO2 and O2/H2O atmospheres

Simple item page
dc.contributor.authorLi, Lin
dc.contributor.authorDuan, Lunbo
dc.contributor.authorTong, Shuai
dc.contributor.authorAnthony, Edward J.
dc.date.accessioned2019-01-03T16:01:50Z
dc.date.available2019-01-03T16:01:50Z
dc.date.issued2018-12-21
dc.description.abstractAs a possible new focus of oxy-fuel work, O2/H2O combustion has many advantages over O2/CO2 combustion, and has gradually gained increasing attention. The unique physicochemical properties (thermal capacity, diffusivity, reactivity) of H2O significantly influence the char combustion characteristics. In the present work, the combustion and kinetics characteristics of lignite char particle were studied in a fluidized bed (FB) reactor under N2, CO2 and H2O atmospheres with different O2 concentrations (15%–27%) and bed temperatures (Tb, 837–937 °C). Results indicated that the average reaction rate (raverage) and the peak reaction rate (rpeak) of lignite char in H2O atmospheres were slower than those in CO2 atmospheres at low O2 concentrations. However, as the O2 concentration increases, the rpeak and raverage of lignite char in H2O atmospheres significantly improved and exceeded those under CO2 atmospheres. The calculation result for the activation energy based on the shrinking-core model showed that the order of activation energy under different atmospheres is: O2/CO2 (28.96 kJ/mol) > O2/H2O (26.11 kJ/mol) > O2/N2 (23.31 kJ/mol). Furthermore, gasification reactions play an important role in both O2/CO2 and O2/H2O combustion, and should not be ignored. As the Tb increased, the active sites occupied by gasification agent were significantly increased, while the active sites occupied by oxygen decreased correspondingly.en_UK
dc.identifier.citationLi L, Duan L, Tong S, Anthony EJ. Combustion characteristics of lignite char in a fluidized bed under O2/N2, O2/CO2 and O2/H2O atmospheres. Fuel Processing Technology, Volume 186, April 2019, pp. 8-17en_UK
dc.identifier.issn0378-3820
dc.identifier.urihttps://doi.org/10.1016/j.fuproc.2018.12.007
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13767
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectO2/H2O combustionen_UK
dc.subjectLignite charen_UK
dc.subjectFluidized bed (FB)en_UK
dc.subjectGasificationen_UK
dc.subjectActivation energyen_UK
dc.titleCombustion characteristics of lignite char in a fluidized bed under O2/N2, O2/CO2 and O2/H2O atmospheresen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Combustion_characteristics_of_lignite_char-2018.pdf
Size:
564.64 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)