so burning it
at the lower burner sets is preferred in the in-furnace blending
method. For Case S-1, it seems that bituminous coal supplied to
burner sets A, B and C has a relatively long residence time to be
burned in the furnace, while bituminous coal in Case S-3, supplied
to the upper furnace (burner sets C, D and E), does not have enough
time to be burned completely. These aspects might attribute to the
decreased carbon in ash in Case S-1 and the increase in Case S-3.
The high oxygen-deficient environment seems to be formed in
Case S-3 with the burning of subbituminous coal in the lower
burner region, and this might lead to inefficient combustion of
bituminous coal in the upper burner region, in turn, there is the
most carbon in ash for Case S-3 than in other cases. Gas tempera-
ture seems to be another factor affecting the amount of carbon in
ash. It was reported that a higher gas temperature field promotes
the burning rate of coal particles [3]
so burning it
at the lower burner sets is preferred in the in-furnace blending
method. For Case S-1, it seems that bituminous coal supplied to
burner sets A, B and C has a relatively long residence time to be
burned in the furnace, while bituminous coal in Case S-3, supplied
to the upper furnace (burner sets C, D and E), does not have enough
time to be burned completely. These aspects might attribute to the
decreased carbon in ash in Case S-1 and the increase in Case S-3.
The high oxygen-deficient environment seems to be formed in
Case S-3 with the burning of subbituminous coal in the lower
burner region, and this might lead to inefficient combustion of
bituminous coal in the upper burner region, in turn, there is the
most carbon in ash for Case S-3 than in other cases. Gas tempera-
ture seems to be another factor affecting the amount of carbon in
ash. It was reported that a higher gas temperature field promotes
the burning rate of coal particles [3]
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