Читать книгу Encyclopedia of Renewable Energy - James Speight G., James G. Speight - Страница 109

Ash analyses are used for evaluation of the corrosion, slagging, and fouling potential of ash. Typically, the ash constituents of interest are silica (SiO2) alumina (Al2O3), titania (TiO2), ferric oxide (Fe2O3), lime (CaO), magnesia (MgO), potassium oxide (K2O), sodium oxide (Na2O), and sulfur trioxide (SO3). An indication of ash behavior can be estimated from the relative percentages of each constituent.

The determination of mineral ash in a fuel is usually by heating (burning) an accurately-weighed sample of the coal in an adequately ventilated muffle furnace at temperatures in the range 700 to 750°C (1,290 to 1,380°F) for 4 hours. Typically, the experimental data should be reproducible within ±0.2% of the end result. Other standard test methods may vary and require somewhat higher temperatures for the determination of the ash in coal.

See also: Ash, Ash Content.