Effect of chemical additives on hard deposit formation and ash composition in a commercial circulating fluidized bed boiler firing Korean solid recycled fuel
| Autor: | Dowon Shun, Dal-Hee Bae, Jong-Seon Shin, Jeong Hwan Lee, Tae-Earn Shim, Keun-Hee Han, Jae Hyeok Park, Dong-Ho Lee |
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| Rok vydání: | 2019 |
| Předmět: |
Ammonium sulfate
Materials science Borax 020209 energy General Chemical Engineering Potassium Organic Chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Combustion Alkali metal chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry Chemical engineering Fly ash Particle-size distribution 0202 electrical engineering electronic engineering information engineering Fluidized bed combustion 0204 chemical engineering |
| Zdroj: | Fuel. 236:792-802 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2018.09.020 |
| Popis: | Combustion of SRF (solid recycled fuel) and biomass with potassium (K), sodium (Na), and chlorine (Cl) contents can result in operational problems such as hard deposit formation and convection pass tube corrosion. Two types of commercially available chemical additives, ammonium sulfate [(NH4)2SO4] and borax solution, were examined to elucidate their effect on hard deposit formation and the particle composition of fly ash on the convection pass of a commercial CFBC (circulating fluidized bed combustion) boiler. The addition of ammonium sulfate/borax solution hindered metal chloride formation and reduced the amount of hard deposit formation on the convection pass tubes. Both the alkali and potassium chloride content and the point load hardness of the hard deposit were reduced, while the melting temperature increased according to the borax solution use. When chemical additives were employed, the particle size distribution of the fly ash shifted to coarse particles. In particular, SEM (scanning electron microscopy) images of the fly ash particles revealed the attachments of fine particles to the ash particles. These were assumed to be mineral salts attached to the coarse particles, which increased the overall particle size distribution. |
| Databáze: | OpenAIRE |
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