An examination of the exothermic nature of fluidized bed combustion (FBC) residues |
| |
| Institution: | 1. School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;2. Mechanical Engineering School, University of Science and Technology Beijing, Beijing 100083, China;3. Beijing Engineering Research Centre of Energy Saving and Environmental Protection, Beijing, 100083, China;1. Abengoa Energía, Solar Technology department, Energía Solar 1, 41014 Sevilla, Spain;2. Department of Energy Engineering, Universidad de Sevilla, Camino de los Descubrimiento s/n, 41092 Sevilla, Spain;3. Materials and Processes Area. Tecnalia Research and Innovation, Mikeletegi Pasealekua, 2, 20009 San Sebastián, Spain;4. Department of Materials Science & Physical Chemistry, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain;5. GREiA Research Group, INSPIRES Research Centre, Universitat de Lleida, Pere de Cabrera s/n, Lleida, Spain;1. Moscow State University, Moscow 119991, Russia;2. National University of Science and Technology “MISiS”, Moscow 119049, Russia;3. National Research South Ural State University, 454080 Chelyabinsk, Russia;4. Ural Federal University, Ekaterinburg 620002, Russia;5. Skolkovo Institute of Science and Technology, Moscow 143026, Russia;6. Louisiana Tech University, Ruston 71272, LA, USA |
| |
| Abstract: | Circulating fluidized bed combustion (CFBC) ashes from nine operational periods at the 183 MWe CFBC boiler at Point Aconi were examined for exothermic behaviour. Bed ashes and fly ashes were investigated using a Parr 1455 solution calorimeter. Limited tests were also carried out with additional samples from Point Aconi and from the 160 MWe TVA Bubbling Fluidized Bed Combustion boiler to evaluate the effects of particle size and aging on exothermic behaviour. For the Point Aconi ashes, heat release from the bed ash ranged from 11 to 52 J/g, and the maximum heat release rates ranged from 0.06 to 0.17 J/g/s. For the fly ash heat release varied from 114 to 187 J/g and the maximum heat release rates ranged from 0.8 to 1.9 J/g/s. In the fly ash samples, 50% or more of available CaO was converted to Ca(OH)2, while for the bed ash a third or less of the CaO was converted to Ca(OH)2. The exothermicity of the bed ash is directly proportional to the CaO content of the ash. However, this is not true for the fly ash. The exothermic behaviour of fresh FBC ash appeared to be greatly reduced by exposure in air over a 48-h period. Another conclusion of this work is that particle size effects the exothermic behaviour. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
