The contributors of carbon in ash for the three cases are
summarized in Fig. 3. For all three cases, carbon in ash is mainly
contributed to burner sets C and D. Burner set B is a supplemented
contributor for Case S-3. Case S-2 shows that carbon in ash mainly
comes from the burner sets C and D, while Case S-1 has the source
of carbon in ash as CONC burner of C set andWEAK burner of D set.
In addition to the burner contribution to carbon in ash, the particle
size specific origin was analyzed. Consideration of this information
on the size effect as well as contributor provides unique insight