The invention relates to a
nickel-making
oxygen-enriching top-blowing immersion spray gun with longer service life. The diameters of a cover cylinder, an air
pipe and an
oxygen pipe of the spray gun successively decrease gradually, and the cover cylinder, the air
pipe and the
oxygen pipe of the spray gun are arranged coaxially; a
mixing chamber is arranged on the outlet end of the spray gun; a multi-stage swirler is arranged between the air pipe and the oxygen pipe of the spray gun; a single-stage swirler is arranged between the oxygen pipe and the fuel pipe of the spray gun; the single-stage swirler is a blade type swirler; and the multi-stage swirler is a six-stage blade type swirler. Due to the arrangement and improvement of the swirlers, the cooling degree is strengthened. Due to the arrangement of a fin, the bending degree of the spray gun is reduced effectively, oxygen and the air of the spray gun are mixed in advance, higher
combustion efficiency is achieved, and the fuel is prevented from being adhered to the inner wall of the
mixing chamber to burn down the inner wall of the
mixing chamber. Because an air stop ring plate is arranged near a sleeve air outlet, the secondary
combustion of
carbon monoxide on the upper part of the furnace is realized, and the generation of elemental
sulfur is inhibited effectively. The immersion depth of the spray gun can be controlled stably, the service life can be prolonged, and the change frequency can be reduced. In addition, the production operation rate can be reduced, and the production cost can be saved.