COMBUSTION DEVICE

摘要

In accordance with the flow distribution of combustion gas including an unburned portion, an after-air port (AAP) arranged downstream of the two-stage combustion burner can effectively reduce the unburned portion by dividing as appropriate so as to avoid interaction, and by mixing together, two types of after-air having functions of linearity and spreading. As the configuration of this AAP, a primary nozzle for supplying primary after-air and having a vertical height greater than the horizontal width is provided in the center in the opening of the AAP, a secondary nozzle for supplying secondary after-air is provided in the opening outside of the primary nozzle, and one or more secondary after-air guide vanes having a fixed or variable tilt angle relative to the after-air port center axis are provided at the outlet of the said secondary nozzle to deflect and supply the secondary after-air horizontally to the left or right.

主权项

1. A combustion device in which burners are disposed on a furnace wall to burn fuel with an amount of air of theoretical air or less, and after-air ports to supply air are disposed on the furnace wall in the downstream side from the position where the burners are disposed, the combustion device characterized in that it comprises:
a primary after-air nozzle (5) which is provided at the central part in an opening (17) of the after-air port with larger vertical height than horizontal width to supply a primary after-air (1); secondary after-air nozzles (14) which are provided in the opening (17) of the after-air port at the outside of the primary after-air nozzle (5) to supply a secondary after-air (11); and one or more pairs of secondary after-air guide vanes (15) which are provided in the outlet parts of the secondary after-air nozzles (14) and have inclination angles with respect to a central axis of the after-air port, so as to deflect the secondary after-air (11) right and left in the horizontal direction and supply the same.