ATTRITION OF AN ALUMINATE-BASED SYNTHETIC SORBENT FOR REGENERATIVE SULFUR CAPTURE FROM FLUE-GAS IN A FLUIDIZED-BED

Attrition tests have been performed on an aluminate-based synthetic so rbent intended for regenerative sulphur capture from flue gas in a flu idised bed coal combustor. A comparison with lime(stone) has also been made. Single-particle crushing strength tests have been used to inves tigate the role of breakage caused by static mechanical stress, while impact tests have been applied to study kinetic stress. Multi-particle fluidised bed tests have been used to examine attrition by thermal sh ock (thermal stress), coal combustion (thermal and chemical stress) an d fluidisation (kinetic stress) independently. The attrition resistanc e of the synthetic sorbent is much higher than that of lime(stone). It appears however that the effect of coal combustion on sorbent attriti on needs further research. The morphology of the sorbents is only slig htly affected by the various tests mentioned above.