Volatilization and Kinetic Characteristics of Arsenic During Coal Combustion

To study the effect of different factors on arsenic volatilization, combustion experiments of seven typical coals were conducted in the temperature range of 600-1 300 ℃, while an analysis was carried out on the dynamic characteristics of arsenic during coal combustion. Results show that when the ash contents are not very different, the ratio of arsenic evaporation is greater than 0.6 for high volatile coal, and is less than 0.3 for low volatile coal at two minutes; when the volatile contents are similar, the ratio of arsenic evaporation is negatively correlated with the ash content in coal; temperature greatly affects the arsenic evaporation, and the main evaporation temperature lies in the range of 700-1 000 ℃; when the volume fraction of water vapor gets up to 10%, it would obviously affect the volatilization ratio and speed of arsenic, however, when the volume fraction goes up continuously, the effect would be gradually weakened; the impact of volatile is greater than ash on the activation energy of arsenic volatilization.