21.微粉炭燃焼により生成する微粒子灰(PM)の生成挙動と微量元素の含有分布

抄録

Mercury distribution in fly ash from a pulverized coal fired plant was investigated for three coals to elucidate the partitioning mechanisms in combustion processes. The fly ashes were classified by an acoustic sieve. Obtained seven classes of particle diameter was measured its Hg content. It is found that mercury concentration in the sieved fly ash is increased with increasing the average particle diameter. Since large size particles contain much unburned carbons, mercury seemed to be adsorbed on its surface. Relation between unburned carbon and Hg concentration had good correlation for three coal types, however, other factors such as surface area and carbon structure of the unburned carbons should be investigated to establish the Hg partitioning mechanisms on solid phase.