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Ash deposition behavior of a high-alkali coal in circulating fluidized bed combustion at different bed temperatures and the effect of kaolin
- Source :
- RSC Advances. 8:33817-33827
- Publication Year :
- 2018
- Publisher :
- Royal Society of Chemistry (RSC), 2018.
-
Abstract
- High alkali and alkali earth metals (AAEMs) content in coal causes severe slagging and fouling during combustion in a boiler. In this study, the ash deposition behavior of a high-alkali coal at different bed temperatures and the effect of kaolin were investigated in a 30 kW circulating fluidized bed (CFB) test system using an ash slagging probe and deposition probe. The results show that the ash deposition tendency increases with the bed temperature. The condensation of Na2SO4 is an important inducement for slag formation in the furnace. The melting or partial melting of slags is attributed to Na–Fe–Ca eutectics. At 920 °C, Na2SO4 will react with CaSO4 to form the low-melting compound of Na2SO4–CaSO4. The deposited ash on the convection-heating surface consists of granular particles. On the windward side, the layered-structure ash deposits, i.e. the inner and outer layers, are formed at the bed temperature of 920 °C but are absent at lower temperatures (820 °C and 870 °C). The formation of the inner layer consists of fine particles (
- Subjects :
- Alkaline earth metal
Materials science
Fouling
business.industry
020209 energy
General Chemical Engineering
Metallurgy
Slag
02 engineering and technology
General Chemistry
Combustion
Alkali metal
visual_art
0202 electrical engineering, electronic engineering, information engineering
visual_art.visual_art_medium
Coal
Fluidized bed combustion
business
Eutectic system
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- RSC Advances
- Accession number :
- edsair.doi.dedup.....5b6786ee23bb5470056201281b525362