Combustion device and boiler

Abstract

A combustion device includes: an ammonia injection nozzle having an injection port facing an internal space of a furnace; a pulverized coal injection nozzle having an injection port facing the internal space of the furnace; an adjustment mechanism that adjusts an injection flow rate of ammonia from the ammonia injection nozzle; and a control device that controls an operation of the adjustment mechanism in such a manner that the injection flow rate of ammonia from the ammonia injection nozzle is higher than an injection flow rate of pulverized coal from the pulverized coal injection nozzle.

1 . A combustion device comprising:
 an ammonia injection nozzle having an injection port facing an internal space of a furnace;   a pulverized coal injection nozzle having an injection port facing the internal space of the furnace;   an adjustment mechanism that adjusts an injection flow rate of ammonia from the ammonia injection nozzle; and   a control device that controls an operation of the adjustment mechanism in such a manner that the injection flow rate of ammonia from the ammonia injection nozzle is higher than an injection flow rate of pulverized coal from the pulverized coal injection nozzle.   
     
     
         2 . The combustion device according to  claim 1 ,
 wherein the adjustment mechanism includes a mechanism that adjusts an opening area of the injection port of the ammonia injection nozzle.   
     
     
         3 . The combustion device according to  claim 1 ,
 wherein the ammonia injection nozzle comprises a plurality of ammonia flow paths, and   the adjustment mechanism includes a mechanism that adjusts a number of ammonia flow paths through which ammonia flows among the plurality of ammonia flow paths.   
     
     
         4 . The combustion device according to  claim 2 ,
 wherein the ammonia injection nozzle comprises a plurality of ammonia flow paths, and   the adjustment mechanism includes a mechanism that adjusts a number of ammonia flow paths through which ammonia flows among the plurality of ammonia flow paths.   
     
     
         5 . A boiler comprising the combustion device according to  claim 1 . 
     
     
         6 . A boiler comprising the combustion device according to  claim 2 . 
     
     
         7 . A boiler comprising the combustion device according to  claim 3 . 
     
     
         8 . A boiler comprising the combustion device according to  claim 4 .