The invention relates to a secondary air gas-fired boiler
combustor and a configuration method of secondary air, and belongs to the technical field of gas-fired boiler emission reduction. The technical aims that
NOx emissions are reduced through a gas-fired boiler, and meanwhile the heat efficiency of the boiler is not reduced are achieved. The secondary air gas-fired boiler
combustor is characterized in that an inner cavity of a
hearth is sequentially divided into a main
combustion area, a
secondary air injection area and an after-
combustion area in the
flue gas flowing direction starting from a gas
combustor; the distance between the main
combustion area and the gas combustor ranges from 0 m to 1 m, and 70%-95% of the
air volume is supplied by the gas combustor; and the distance between the
secondary air injection area and the gas combustor ranges from 1 m to 9 m, the furnace wall of the
hearth is provided with a plurality of secondary air nozzles connected with a secondary air conveying pipeline, and 5%-30% of the
air volume is supplied by the secondary air nozzles. The secondary air gas-fired boiler combustor has the beneficial effects that the secondary air nozzles are formed in the downstream portion of the gas combustor, the combustion temperature of the main combustion area is reduced, the reducibility
atmosphere of the main combustion area is made, and generated thermal
NOx and generated fuel
NOx are restrained; and the secondary air guarantees that gas fuel is completely combusted, and the heat efficiency of the boiler is not reduced.