Model of fragmentation of limestone particles during thermal shock and calcination in fluidised beds

Simultaneous calcination and sulfation of limestone in CFBB

“…But both of these two models assumed that the calcination of limestone was not hindered by sulfation, and their investigations were under the in-furnace limestone injection conditions with small limestone particle (<50 lm), high reaction temperature (>900°C) and short reaction time (<1.5 s), which meant that the results of their models cannot represent the typical reaction conditions of limestone in CFBB. Saastamoinen et al [31] measured the outlet CO 2 and SO 2 concentrations in an experiment bubbling fluidized bed reactor to investigate the influence of fragmentation in simultaneous sulfation and calcination conditions, and found that the maximum rate of sulfur capture takes place during calcination. Fluidized bed reactor with gas concentration measurements is a good choice for investigating simultaneous sulfation and calcination phenomenon because both the calcination and sulfation could be reflected separately, but TGA maybe a better choice for getting accurate reaction kinetics.…”

The calcium looping cycle for CO2 capture from power generation, cement manufacture and hydrogen production

“…This pore blockage then prevents access of CO 2 to the centre of a particle. There has been a large volume of research published on the attrition characteristics of limestone for SO 2 capture (Anthony and Granatstein, 2001;Smith, 2007;Chen et al, 2008;Saastamoinen et al, 2008;Scala et al, 2008;Blamey et al, 2010). However, there is less research regarding limestone for CO 2 capture.…”

The Carbonation Behaviors of Limestone Particle in Oxygen-Fuel Circulating Fluidized Bed O&lt;sub&gt;2&lt;/sub&gt;/CO&lt;sub&gt;2 &lt;/sub&gt;Flue Gas

“…In fact, it may not be quite that simple for oxygen-fuel circulating fluidized bed (CFB) flue gas, because carbonation will happen at that carbon-dioxide-rich atmosphere. CaO carbonation is actually a reversible reaction about CaCO 3 calcinations [8] as shown in Figures 3 and 4. The phenomenon that limestone is partly calcined into CaO does exist at the CFB oxygen-rich combustion zone where CO 2 concentration is lower and temperature is relatively higher, and when these CaO reach carbondioxide-rich zone it will present carbonation reaction [9].…”