The invention relates to a storage-type super-low
nitric oxide system in a
coal fired boiler
coal mill. On the basis of the existing low-
nitrogen burning technology, the superfine
coal powder preparation technology and the
smoke circulating technology are adopted. The
smoke circulating technology adopts cold furnace
smoke to be mixed with primary air to be supercharged by a primary fan, the heating and
powder feeding technology of an
air preheater and the hot air and high-temperature furnace smoke
drying technology of the
powder production
system are adopted, i.e. superfine coal powder can be prepared, the hot furnace smoke enters a primary air large air bellow, the hot furnace smoke is mixed with superfine coal powder prepared by a superfine coal powder preparation device in a coal powder blender and supplied by a powder supply
machine from a coal powder cabin to be heated, and the air-
powder mixture is fed into a low-
nitrogen burner through a primary air
pipe. In the main burning area of the boiler, since the
air content of the furnace smoke is little, a lower residual air coefficient can be realized, the emission of the
nitric oxide can be reduced.