Improved combustion of high ash coals.

摘要

© A method is described for burning pulverized high ash coal in a furnace firebox and reducing ash fines which comprises

(a) injecting a primary airstream containing a pulverized coal which is at least 7 wt% ash and a secondary airstream into the flame zone of a furnace firebox and combusting the coal to yield a flame of combustion, and

(b) injecting a sufficient amount of oxygen into the flame zone via the secondary airstream such that the oxygen concentration of the combined primary and secondary airstreams is between 21 to about 28 vol%.

In a preferred embodiment, the oxygen enrichment addition is proportioned between the primary and the secondary air streams.