Combustor and gas turbine

Abstract

Provided is a combustor that includes a plurality of main burners disposed at intervals in a circumferential direction. The main burners include first main burners ( 16 A) and second main burners ( 16 B) that separately generate fuel-air mixtures. The second main burners ( 16 B) generate fuel-air mixtures that have less evenness in concentration of fuel than the fuel-air mixtures generated by the first main burners ( 16 A).

1 - 5 . (canceled) 
     
     
         6 . A combustor comprising a plurality of main burners disposed at intervals in a circumferential direction,
 wherein the main burners include
 first main burners that generate fuel-air mixtures, and 
 second main burners that generate fuel-air mixtures that have less evenness in concentration of fuel than the fuel-air mixtures generated by the first main burners, and 
   the first main burners and the second main burners are disposed in an aperiodic disposition pattern over an entire circumference in the circumferential direction;   the second main burners make the concentration of fuel of the fuel-air mixtures more uneven than that of the fuel-air mixtures of the first main burners in circumferential directions centered on main nozzles;   each of the second main burners includes
 first fuel discharge holes that are disposed on a first side in the circumferential direction centered on the main nozzle and discharge the fuel, and 
 second fuel discharge holes that are disposed on a second side opposite to the first side in the circumferential direction centered on the main nozzle and discharge the fuel; and 
   the first fuel discharge holes and the second fuel discharge holes are separately divided on an inner side and an outer side and disposed in the radial direction centered on the combustor axis.   
     
     
         7 . A combustor comprising a plurality of main burners disposed at intervals in a circumferential direction,
 wherein the main burners include
 first main burners that generate fuel-air mixtures, and 
 second main burners that generate fuel-air mixtures that have less evenness in concentration of fuel than the fuel-air mixtures generated by the first main burners; 
   the first main burners and the second main burners are disposed in an aperiodic disposition pattern over an entire circumference in the circumferential direction;   the second main burners make the concentration of fuel of the fuel-air mixtures more uneven than that of the fuel-air mixtures of the first main burners in circumferential directions centered on main nozzles;   each of the second main burners includes
 first fuel discharge holes that are disposed on a first side in the circumferential direction centered on the main nozzle and discharge the fuel, and 
 second fuel discharge holes that are disposed on a second side opposite to the first side in the circumferential direction centered on the main nozzle and discharge the fuel; and 
   the first fuel discharge holes and the second fuel discharge holes are separately divided and disposed in the circumferential direction centered on the combustor axis.   
     
     
         8 . A combustor comprising a plurality of main burners disposed at intervals in a circumferential direction,
 wherein the main burners include
 first main burners that generate fuel-air mixtures, and 
 second main burners that generate fuel-air mixtures that have less evenness in concentration of fuel than the fuel-air mixtures generated by the first main burners; 
   the first main burners and the second main burners are disposed in an aperiodic disposition pattern over an entire circumference in the circumferential direction;   the second main burners make the concentration of fuel of the fuel-air mixtures more uneven than that of the fuel-air mixtures of the first main burners in circumferential directions centered on main nozzles;   each of the second main burners includes
 first fuel discharge holes that are disposed on a first side in the circumferential direction centered on the main nozzle and discharge the fuel, and 
 second fuel discharge holes that are disposed on a second side opposite to the first side in the circumferential direction centered on the main nozzle and discharge the fuel; 
   the first fuel discharge holes and the second fuel discharge holes are separately divided on an inner side and an outer side and disposed in the radial direction centered on the combustor axis; and   the main burners as a plurality of the second main burners, includes both
 a second main burner in which the first fuel discharge holes are disposed radially inward in the radial direction centered on the combustor axis, and 
 a second main burner in which the first fuel discharge holes are disposed radially outward in the radial direction centered on the combustor axis. 
   
     
     
         9 . A combustor comprising a plurality of main burners disposed at intervals in a circumferential direction,
 wherein the main burners include
 first main burners that generate fuel-air mixtures, and 
 second main burners that generate fuel-air mixtures that have less evenness in concentration of fuel than the fuel-air mixtures generated by the first main burners; 
   the first main burners and the second main burners are disposed in an aperiodic disposition pattern over an entire circumference in the circumferential direction;   the second main burners make the concentration of fuel of the fuel-air mixtures more uneven than that of the fuel-air mixtures of the first main burners in circumferential directions centered on main nozzles;   the main burners as a plurality of the second main burners, includes
 a second main burner having first fuel discharge holes that are disposed on a first side in the radial direction centered on the main nozzle and discharge the fuel, and second fuel discharge holes that are disposed on a second side opposite to the first side in the radial direction centered on the main nozzle and discharge the fuel, and 
 a second main burner having first fuel discharge holes that are disposed on a first side in the circumferential direction centered on the main nozzle and discharge the fuel, and second fuel discharge holes that are disposed on a second side opposite to the first side in the circumferential direction centered on the main nozzle and discharge the fuel. 
   
     
     
         10 . The combustor according to  claim 6 , wherein the second fuel discharge holes have larger hole diameters than the first fuel discharge holes. 
     
     
         11 . The combustor according to  claim 7 , wherein the second fuel discharge holes have larger hole diameters than the first fuel discharge holes. 
     
     
         12 . The combustor according to  claim 8 , wherein the second fuel discharge holes have larger hole diameters than the first fuel discharge holes. 
     
     
         13 . The combustor according to  claim 9 , wherein the second fuel discharge holes have larger hole diameters than the first fuel discharge holes. 
     
     
         14 . The combustor according to  claim 6 , further comprising:
 a first fuel supply system that supplies the fuel to the first fuel discharge holes; and   a second fuel supply system that supplies the fuel to the second fuel discharge holes at a pressure different from that of the first fuel supply system.   
     
     
         15 . The combustor according to  claim 7 , further comprising:
 a first fuel supply system that supplies the fuel to the first fuel discharge holes; and   a second fuel supply system that supplies the fuel to the second fuel discharge holes at a pressure different from that of the first fuel supply system.   
     
     
         16 . The combustor according to  claim 8 , further comprising:
 a first fuel supply system that supplies the fuel to the first fuel discharge holes; and   a second fuel supply system that supplies the fuel to the second fuel discharge holes at a pressure different from that of the first fuel supply system.   
     
     
         17 . The combustor according to  claim 9 , further comprising:
 a first fuel supply system that supplies the fuel to the first fuel discharge holes; and   a second fuel supply system that supplies the fuel to the second fuel discharge holes at a pressure different from that of the first fuel supply system.   
     
     
         18 . A gas turbine comprising the combustor according to  claim 6 . 
     
     
         19 . A gas turbine comprising the combustor according to  claim 7 . 
     
     
         20 . A gas turbine comprising the combustor according to  claim 8 . 
     
     
         21 . A gas turbine comprising the combustor according to  claim 9 .