The invention relates to a
fuel gas graded and segmented distribution
combustion device. The
fuel gas graded and segmented distribution
combustion device can be matched with various boiler furnaces, and the purpose of ultra-low
NOx emission is realized. The
fuel gas graded and segmented distribution
combustion device belongs to the technical field of emission reduction of industrial boilers and is characterized in that an outer fuel gas gun fixing plate perpendicular to the central axis is arranged between the end of the outer edge of a
throat and the end of an inner annular
barrel; a gun head of an outer fuel gas gun penetrates through and is exposed out of the outer fuel gas gun fixing plate; a combustion air passage is arranged between the inner annular
barrel and an outer annular
barrel; and the outer wall of the outer annular barrel is attached to and connected with the inner wall of a
refractory material layer. The fuel gas graded and segmented distribution combustion device has the positive effects that a novel gas and air graded and segmented
distribution method is provided, and the outer fuel gas gun is arranged on the outer side of the
throat, so that the space of the
boiler furnace is used to the maximum extent, and the average temperature and peak temperature of
flame are lowered; and the outer-layer combustion air passage is arranged, overall dense-
lean combustion of a
combustor area is formed, and the generation of
NOx is further reduced, so that ultra-low
NOx emission smaller than 30 mg / Nm<3> is realized, and no CO is generated.