COMBUSTION BURNER AND BOILER

摘要

A combustion burner and boiler, which are provided with an air nozzle (41) for spraying air, a first fuel nozzle (42) for spraying a gas fuel on the outside of the air nozzle (41), a primary air nozzle (43) for spraying primary air on the outside of the first fuel nozzle (42), a secondary air nozzle (44) for spraying secondary air on the outside of the primary air nozzle (43), a recirculated exhaust gas nozzle (45) for spraying recirculated exhaust gas on the outside of the secondary air nozzle (44), and a second fuel nozzle (46) for spraying a gas fuel onto the passage (45a) of the recirculated exhaust gas nozzle (45), whereby the mixture ratio of the liquid fuel and air is brought to an optimal ratio, the amount of NOx generated is reduced, and heat damage to the nozzle tip section is prevented.