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Simultaneous hydration/carbonation of FBC ash by low-frequency sonication by Yinghai Wu; Edward J. Anthony; Jinsheng Wang; Lufei Jia is a Engineering article available to read on EtoBox.

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Simultaneous hydration and carbonation of ash from fluidized bed combustion was studied using a new sonication technology. Enhanced carbonation of the ash by CO 2 was achieved at ambient temperature by use of a sonic generator with low frequency (100-500 Hz). At lower sonic intensity, the product was mainly Ca(OH) 2 whereas at higher intensity the product was primarily CaCO 3 . Results of a simulation, assuming that the CaCO 3 is formed from Ca(OH) 2 , described the observed time dependence for Ca(OH) 2 and CaCO 3 conversion well. The hydrated/carbonated ash was tested as sulphur sorbent and the sulphation activity of the ash increased with increasing CaCO 3 content. This result can be attributed to the larger molar volume of CaCO 3 compared to that of Ca(OH) 2 , which resulted in larger porosity and specific surface area of the particles upon thermal decomposition.

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Author

Yinghai Wu; Edward J. Anthony; Jinsheng Wang; Lufei Jia

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0255-2701)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)