Various Methods to Prepare High-Efficiency CaO Sorbents for Improved SO2 Capture Capacity

The reaction of calcium oxide with sulfur dioxide is one of the most important method for the flue gas desulfurization. However, the SO 2 -capturing capacity of calcium oxide is low because of rapid pore blockage by solid products. In the present study, various methods for producing more porous soli...

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Bibliographic Details
Published in:International journal of coal preparation and utilization 2016-09, Vol.36 (5), p.231-240
Main Authors: Moshiri, H., Ale Ebrahim, H., Nasernejad, B.
Format: Article
Language:English
Subjects:
CaO sorbent
capture capacity
Carbon sequestration
Finite element analysis
finite element method
Flue gas
flue gas desulfurization
modified grain model
porous structure
Sorbents
Sulfur
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Summary:The reaction of calcium oxide with sulfur dioxide is one of the most important method for the flue gas desulfurization. However, the SO 2 -capturing capacity of calcium oxide is low because of rapid pore blockage by solid products. In the present study, various methods for producing more porous solid lime structures were investigated. These methods consisted of microwave heating, freezing/thawing, adding some decomposable materials, and acetic acid washing of lime. The SO 2 -capturing capacity of the produced sorbents were compared with the blank samples in a thermogravimetric analyzer at 850°C and 1000 ppm. The best performance was observed for the acid-washed lime. Finally, the experimental conversion-time profiles of natural and acid-washed limes were successfully predicted by modified grain model.
ISSN:1939-2699
1939-2702
DOI:10.1080/19392699.2015.1111877