NDLI: Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

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Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Content Provider	Semantic Scholar
Author	Mendiara, Teresa Gayán, Pilar Rodríguez Abad, Alberto Diego, Luis F. De García-Labiano, Francisco Adánez, Juan
Copyright Year	2013
Abstract	Abstract In the Chemical-Looping Combustion (CLC) technology, the oxygen needed for the oxidation of the fuel is provided by an oxygen-carrier. Today, there is an increasing interest on CLC application to coal. One of the possibilities is the in situ gasification and subsequent combustion of the product gases ( iG -CLC). Potential CLC oxygen-carriers should be as inexpensive as possible, as some losses are expected accompanying the ashes. In the present work, a residue from alumina production mainly constituted by Fe 2 O 3 has been tested as oxygen-carrier. Batch experiments were carried out in a fluidized-bed reactor using a bituminous coal as fuel. The effect of operating conditions, such as temperature and gasification agent on the char conversion and combustion efficiency of gasification products were evaluated. After 50 hours of cycling operation in a batch fluidized bed, no defluidization or agglomeration problems were observed. A gain in the reactivity of the bauxite waste was observed with the number of redox cycles. The carrier showed high combustion efficiencies at all temperatures. The percentage of CO 2 in the feeding should be limited in order to maintain high gasification rates and combustion efficiencies. Results indicate that this bauxite waste is a promising oxygen-carrier for the i G-CLC of coal.
Starting Page	57
Ending Page	69
Page Count	13
File Format	PDF HTM / HTML
DOI	10.1016/j.fuproc.2012.09.038
Volume Number	109
Alternate Webpage(s)	http://digital.csic.es/bitstream/10261/84761/1/Performance_of_a_bauxita.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.fuproc.2012.09.038
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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