The invention belongs to the technical field of
industrial gas burner and relates to a
low emission high-power staged-
combustion gas burner. The staged-
combustion gas burner is characterized in that a swirling
machine, a
flame stabilizing plate, a central canister and a middle
pipe are coaxially arranged in the
throat of the burner main body from outer to inner, wherein the
flame stabilizing plate is provided with a gas gun which is axially fixed and has same uniformly distributed radial lines. The gas
collocation method comprises the following steps: (1) collocating no gas in a direct
air channel, in which is low-speed central cooling air, (2) mixing the high-speed swirling air entered from a swirling
air channel with the gas jetted from a small gas hole B on the gas gun along the radialdirection till reaching to the semi-premixed state before emerging from the
throat of the
gas burner, and (3) face-to-face jetting the gas from a big gas hole on the top of the gas gun, the high-speed swirling air and the high-speed
peripheral axial air flow so as to form non-premixing
diffusion combustion. Because of the air, the staged gas
branch supply, the premixing combustion and the non-premixing
diffusion combustion, the combustion is uniform and
NOx is prevented from being generated. The
discharge amount of
NOx of the gas burner is 70% lower than that of the common burner in the priorart.