Wall-arranged giant ring-shaped straight-through pulverized coal burner

Abstract

A wall-arranged giant ring-shaped direct-current pulverized coal burner includes burner nozzles arranged on four side furnace walls of a boiler. The burner nozzles on the four side furnace walls form a wall-tangential combustion mode in the furnace, and the burner nozzles on each side furnace wall are arranged in a ring by a plurality of small nozzles to form a giant ring-shaped combined nozzle. There is a plurality of small nozzles arranged in a ring on each side furnace wall to form a giant ring-shaped combined nozzle. The giant ring-shaped combined nozzles on the four side furnace walls may form a wall- tangential combustion mode in the furnace. Through the mutual entrainments of the multiple airflows in the giant ring-shaped combined nozzle and the mutual support of the fireside and back-fire-side airflows, the stiffness of each airflow may be effectively enhanced.

What is claimed is: 
     
         1 . A wall-arranged giant ring-shaped straight-through pulverized coal burner, comprising burner nozzles arranged on four side furnace walls of a boiler, the burner nozzles on the four side furnace walls form a wall-tangential combustion mode inside the boiler furnace, wherein each burner nozzle on each side furnace wall comprises a plurality of small nozzles arranged along a ring to form a giant ring-shaped combined nozzle. 
     
     
         2 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 1 , wherein the small nozzles forming the giant ring-shaped combined nozzle are arranged along a ring selected from a group consisting of a circular ring, an elliptical ring and a rectangular ring. 
     
     
         3 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 1 , wherein on each side furnace wall corresponding to a main combustion region inside the furnace, a plurality of the giant ring-shaped combined nozzles are provided along a furnace height direction. 
     
     
         4 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 1 , wherein on each side furnace wall corresponding to the main combustion region inside the furnace, the giant ring-shaped combined nozzle comprises a plurality of small primary air nozzles and a plurality of small secondary air nozzles arranged along the ring. 
     
     
         5 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 4 , wherein the plurality of small primary air nozzles and the plurality of small secondary air nozzles are arranged at intervals with one another along the ring. 
     
     
         6 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 4 , wherein the plurality of small primary air nozzles and the plurality of small secondary air nozzles are arranged on a ring selected from a group consisting of a circular ring, an elliptical ring and a rectangular ring in a mode selected from a group consisting of a two-two concentrated mode and a three-three concentrated mode. 
     
     
         7 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 4 , wherein the plurality of small primary air nozzles and the plurality of small secondary air nozzles are arranged on two rings selected from the group consisting of two concentric circular rings, two elliptical rings and two rectangular rings. 
     
     
         8 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 4 , wherein the plurality of small primary air nozzles and the plurality of small secondary air nozzles are respectively arranged on two circular rings which have equal diameters and are not concentric. 
     
     
         9 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 1 , wherein on each side furnace wall corresponding to a burnout area at an upper part of the furnace, the giant ring-shaped combined nozzle comprises a plurality of small separated over fire air nozzles arranged in a ring. 
     
     
         10 . The wall-arranged giant ring-shaped straight-through pulverized coal burner according to  claim 1 , wherein the small nozzles installed on the side furnace wall are adjusted upward, downward, leftward and rightward.