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Title

Coal combustion with a spray granulated Cu-Mn mixed oxide for the Chemical Looping Oxygen Uncoupling (CLOU) process

AuthorsAdánez-Rubio, Iñaki; Abad Secades, Alberto CSIC ORCID ; Gayán Sanz, Pilar CSIC ORCID ; García Labiano, Francisco CSIC ORCID ; Diego Poza, Luis F. de ; Adánez Elorza, Juan CSIC ORCID
KeywordsCO2 capture
Coal
CLOU
Mixed oxide
Copper
Manganese
Issue Date15-Dec-2017
PublisherElsevier
CitationApplied Energy 208: 561-570 (2017)
AbstractThe Chemical Looping with Oxygen Uncoupling (CLOU) process is a form of Chemical Looping Combustion (CLC) technology that enables the combustion of solid fuels by means of oxygen carriers that release gaseous oxygen in the fuel reactor, i.e. with oxygen uncoupling capability. In recent years, tests have found several Cu-based, Mn-based and mixed oxide oxygen carriers with suitable properties for the CLOU process. Among them, Cu-Mn mixed oxides show high reactivity and high O2 equilibrium concentration at temperatures of interest for coal combustion. In this work, proof of concept was demonstrated by burning coal with Cu-Mn mixed oxides in a 1.5 kWth CLOU unit for the first time. The effect of fuel reactor temperature, solids circulation flow, fluidization agent in the fuel reactor (inert N2 or steam as gasifying agent), and excess air in the air reactor on combustion efficiency and CO2 capture rate was analysed. The results showed that high combustion efficiency and CO2 capture are feasible using this material at relatively low fuel reactor operating temperatures. Therefore, the developed Cu-Mn mixed oxide was a suitable material for use as an oxygen carrier for the CLOU combustion of solid fuels. Optimum operating conditions were determined for this oxygen carrier with regard to the oxygen circulation rate and air reactor conditions for the regeneration of the oxygen carrier.
Description© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher version (URL)https://doi.org/10.1016/j.apenergy.2017.09.098
URIhttp://hdl.handle.net/10261/159332
DOIhttp://dx.doi.org/10.1016/j.apenergy.2017.09.098
ISSN0306-2619
Appears in Collections:(ICB) Artículos
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