Conference Dates
May 1-5, 2011
Abstract
The influence of temperature, heating rate and chemical reaction on fragmentation
and attrition of limestone in a fluidized bed (FB) was investigated. The intensity of
fragmentation and attrition was measured in the same apparatus but at different
fluidizing velocities and fluidizing media. It was found that the heating rate has a
positive effect on fragmentation for the tested limestones. The effect of bed
temperature on limestone fragmentation was inconclusive. The influence of
chemical reaction on the fragmentation seems to be complicated; CO2 release due to
calcination would prompt fragmentation while the sulfation would increase the gas
diffusion resistance and depresses the fragmentation intensity. On the other hand,
the CaSO3/CaSO4 layer was found to be attrition-resistant leading to small attrition
rates. Attrition rate constant showed to decay exponentially with time and
approaching a constant for all limestone particles. Particle sizes between 200-400 µm
have larger attrition rate constant than coarse ones perhaps due to their large specific
surface area.
Recommended Citation
Xuan Yao, Hairui Yang, Pierre Gauville, Hairui Yang, John H. Chiu, and Shin G. Kang, "Bench-Scale Investigation of Limestone Size Evolution in a Fluidized Bed Combustor" in "10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10", T. Knowlton, PSRI Eds, ECI Symposium Series, (2013). https://dc.engconfintl.org/cfb10/77