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 estimaternboron concentration in waste water from power station. Boron content in fly ash which was collected atrncyclone is analyzed for ten coals. Boron recovery is different from coal types, for example, a significantrnamount of boron is retained in the fly ash for some types of coal. The recovery is compared with boronrncontent and various properties of the coal and the fly ash. However, almost all the properties have notrndirectly correlation with the boron recovery, although only Ca content in fly ash indicates roughlyrnrelationship. To clear effects of coal types on the partitioning behavior of boron, it is important tornunderstand boron vaporization process and coagulation process. Fundamental tests for boronrnvaporization also were performed to determine control process of boron behavior during combustion.