The influence of the addition of sodium on the transformation of alkali and alkaline-earth metals during oxy-fuel combustion
| Autor: | Liying Wang, Zengshuang Wang, Jian-Ying Lin, Liping Chang, Meijun Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
business.industry
020209 energy Sodium Inorganic chemistry chemistry.chemical_element Coal combustion products Sodium silicate 02 engineering and technology Alkali metal Combustion complex mixtures chemistry.chemical_compound 020401 chemical engineering chemistry 0202 electrical engineering electronic engineering information engineering Coal 0204 chemical engineering business Sodium acetate Sodium aluminosilicate |
| Zdroj: | Journal of the Energy Institute. 91:502-512 |
| ISSN: | 1743-9671 |
| DOI: | 10.1016/j.joei.2017.04.007 |
| Popis: | Alkali and alkaline-earth metals (AAEM) of coal directly affect the coal combustion properties and ash formation during coal oxy-fuel combustion. To further understand the influence of adding sodium on the transformation of AAEM, sodium chloride (NaCl) and sodium acetate (NaAc) were added to Shenmu coal in this study. A drop-tube reactor and ion chromatography were adopted in this study and a serial dissolution method was used to clarify the occurrence modes of the AAEM. The results showed that all types of AAEM can release and the release rates were increased with an increase in temperature during oxy-fuel combustion. Water-soluble (W-type) alkali metals react with SiO2 and Al2O3 in coal and are converted into acid-soluble (H-type) silicate or acid-insoluble (I-type) aluminosilicate under certain experimental conditions. The addition of sodium can promote the release of AAEM via promoting coal combustion; the promotion effect was significant at 600 °C, and the effect of NaCl was more noticeable than that of NaAc. Furthermore, the promoting effect on alkali metals was more noticeable than that on alkali-earth metals. The added sodium can also react with SiO2 and Al2O3 to form H-type sodium silicate or I-type sodium aluminosilicate. |
| Databáze: | OpenAIRE |
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