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Title

Morphological analysis of sulfated Ca-based sorbents under conditions corresponding to oxy-fuel fluidized bed combustion

AuthorsObras-Loscertales, Margarita de las; Rufas, Aránzazu; Diego Poza, Luis F. de ; García Labiano, Francisco ; Gayán Sanz, Pilar ; Abad Secades, Alberto ; Adánez Elorza, Juan
KeywordsCO2 capture
Oxy-fuel combustion
Fluidized bed
Ca-based sorbent
Desulfurization
Issue Date15-Dec-2015
PublisherElsevier
CitationFuel 162: 264-270 (2015)
AbstractThe use of Ca-based sorbents in circulating fluidized beds (CFB) allows the in-situ desulfurization in oxy-fuel combustion processes. The sulfation process involves important changes in the sorbent morphology, which could vary depending on the operating conditions and be different to those observed in conventional air combustion. This work analyzes the morphological variations observed during limestone and dolomite sulfation at typical oxy-fuel combustion conditions (high CO2 concentration, higher temperatures than in air combustion) in CFB combustors (long reaction times). Sulfated samples prepared in a thermogravimetric analyzer were analyzed by Scanning Electron Microscope (SEM). The space limitations due to the higher molar volume of CaSO4 compared to CaO in the external surface of the particles make that the CaSO4 product layer trend to grow outwards to form a honeycomb-shaped structure. This structure appeared for limestone at both calcining and non-calcining conditions. A strong effect of the CaSO4 sintering phenomenon was observed at temperatures above 950 °C. Moreover, the honeycomb structure was never observed working with dolomite in spite of the high sulfation conversions reached with this sorbent.
Publisher version (URL)http://dx.doi.org/10.1016/j.fuel.2015.09.016
URIhttp://hdl.handle.net/10261/140211
DOI10.1016/j.fuel.2015.09.016
ISSN0016-2361
Appears in Collections:(ICB) Artículos
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