Combined combustion burner and combustion apparatus including same

Abstract

A combined combustion burner and a combustion apparatus including the combined combustion burner. The combined combustion burner may include a center tube forming a center passage configured to supply cooling air, a fuel tube surrounding the center tube and forming a fuel passage through which premixed fuel mixed with solid fuel and primary air is sprayed, a secondary tube surrounding the fuel tube and forming a secondary passage through which secondary air is sprayed, and an additional spray nozzle inserted inside the center tube and configured to spray auxiliary fuel containing ammonia.

What is claimed is: 
     
         1 . A combined combustion burner comprising:
 a center tube forming a center passage configured to supply cooling air;   a fuel tube surrounding the center tube and forming a fuel passage through which premixed fuel mixed with solid fuel and primary air is sprayed;   a secondary tube surrounding the fuel tube and forming a secondary passage through which secondary air is sprayed; and   an additional spray nozzle inserted inside the center tube and configured to spray auxiliary fuel containing ammonia.   
     
     
         2 . The combined combustion burner of  claim 1 , wherein the additional spray nozzle is configured to spray the auxiliary fuel to an inner side of a space where the secondary air is sprayed. 
     
     
         3 . The combined combustion burner of  claim 1 , wherein the additional spray nozzle is configured to spray the auxiliary fuel to an inner side of a space where the premixed fuel is sprayed. 
     
     
         4 . The combined combustion burner of  claim 3 , wherein an oil nozzle configured to spray liquid fuel is mounted in the center passage, and the additional spray nozzle is configured to spray the auxiliary fuel to an outside of a space where the liquid fuel is sprayed. 
     
     
         5 . The combined combustion burner of  claim 1 , wherein the additional spray nozzle is mounted such that ammonia is sprayed to a recirculation area. 
     
     
         6 . The combined combustion burner of  claim 1 , wherein a discharge portion inclined with respect to a longitudinal direction of the additional spray nozzle is formed on the additional spray nozzle. 
     
     
         7 . The combined combustion burner of  claim 6 , wherein a spray port through which the auxiliary fuel is sprayed is formed on the additional spray nozzle, and the spray port is formed such that a normal direction of the spray port is inclined with respect to a radial direction of the additional spray nozzle. 
     
     
         8 . The combined combustion burner of  claim 6 , wherein one part of an outer circumferential surface of the discharge portion extends in a straight line, and the other part of the outer circumferential surface of the discharge portion is curved in an arc shape. 
     
     
         9 . The combined combustion burner of  claim 6 , wherein the additional spray nozzle is mounted such that the additional spray nozzle is capable of being rotated with respect to a central axis of the additional spray nozzle. 
     
     
         10 . The combined combustion burner of  claim 6 , wherein a rotation control member configured to rotate the additional spray nozzle is connected to the additional spray nozzle. 
     
     
         11 . The combined combustion burner of  claim 2 , wherein an auxiliary spray member configured to spray ammonia fuel containing ammonia in a gaseous state into the fuel passage is mounted in the fuel passage. 
     
     
         12 . The combined combustion burner of  claim 11 , wherein the auxiliary spray member is formed in a ring shape, comprises a plurality of spray holes configured to spray the ammonia fuel, and comprises a distribution passage that extends along a circumferential direction of the auxiliary spray member. 
     
     
         13 . The combined combustion burner of  claim 12 , wherein the auxiliary spray member is fixed to an outer circumferential surface of the center tube. 
     
     
         14 . The combined combustion burner of  claim 13 , wherein an ammonia supply tube connected to the distribution passage is mounted in the center tube. 
     
     
         15 . The combined combustion burner of  claim 12 , wherein the spray holes are inclined toward an outside of a radial direction of the auxiliary spray member. 
     
     
         16 . The combined combustion burner of  claim 15 , wherein the spray holes are formed of long holes. 
     
     
         17 . The combined combustion burner of  claim 16 , wherein the spray holes are formed such that a major axis direction of the spray holes is inclined with respect to the radial direction. 
     
     
         18 . The combined combustion burner of  claim 17 , wherein the spray holes are formed such that an inner diameter of each of the spray holes is gradually decreased toward a downstream side of each of the spray holes. 
     
     
         19 . A combustion apparatus comprising:
 a furnace forming a combustion space; and   a burner comprising a plurality of burners mounted in the furnace,   wherein the burner comprises:   a center tube forming a center passage configured to supply cooling air;   a fuel tube surrounding the center tube and forming a fuel passage through which premixed fuel mixed with solid fuel and primary air is sprayed;   a secondary tube surrounding the fuel tube and forming a secondary passage through which secondary air is sprayed; and   an additional spray nozzle inserted inside the center tube and configured to spray auxiliary fuel containing ammonia.   
     
     
         20 . The combustion apparatus of  claim 19 , wherein an oil nozzle configured to spray liquid fuel is mounted in the center passage, and the additional spray nozzle is configured to spray the auxiliary fuel to an outside of a space where the liquid fuel is sprayed and is configured to spray the auxiliary fuel to an inside of a space where the premixed fuel is sprayed.