22.微粉炭燃焼プロセスにおける微量元素放出挙動への炭種の影響

抄録

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 that was collected by cyclone is analyzed for ten coals. Boron recovery is different from coal type; 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 Ca and Mg 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.