Effects of coal types on trace elements emission in pulverized coal fired process

摘要

The partitioning behavior of boron in pulverized coal combustion is investigated to estimate boron concentration in waste water from power station. Boron content in fly ash which was collected at cyclone is analyzed for ten coals. Boron recovery is different from coal types, for example, a significant amount of boron is retained in the fly ash for some types of coal. The recovery is compared with boron content and various properties of the coal and the fly ash. However, almost all the properties have not directly correlation with the boron recovery, although only Ca content in fly ash indicates roughly relationship. To clear effects of coal types on the partitioning behavior of boron, it is important to understand boron vaporization process and coagulation process. Fundamental tests for boron vaporization also were performed to determine control process of boron behavior during combustion.