Gas combustion treatment method and apparatus therefor

Abstract

A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and burned; a nitrogen oxide reduction step downstream of the first combustion treatment step, in which a portion of the hydrogen sulfide-containing gas or the ammonia-containing gas is introduced and the nitrogen oxides produced in the first combustion treatment step are reduced in a reducing atmosphere; and a second combustion treatment step downstream of the nitrogen oxide reduction step, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned. The present invention provides a combustion apparatus suitable for use as a combustion furnace for off-gases resulting from the wet purification of coal gasification gas.

1 . A gas combustion apparatus for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, said apparatus comprising: 
 a first combustion section in which a fuel and the ammonia-containing gas are introduced and burned;    a nitrogen oxide reduction section located downstream of the first combustion section, in which a portion of the hydrogen sulfide-containing gas is introduced and the nitrogen oxides transferred from the first combustion section are reduced under a reducing atmosphere; and    a second combustion section located downstream of the nitrogen oxide reduction section, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned.    
   
   
       2 . A gas combustion apparatus as claimed in  claim 1 , wherein the cross section of the gas flow path extending from the first combustion section to the nitrogen oxide reduction section is made smaller than the cross sections of the first combustion section and the nitrogen oxide reduction section.  
   
   
       3 . A gas combustion apparatus as claimed in  claim 1 , wherein a radiation shield is provided between the nitrogen oxide reduction section and the second combustion section.  
   
   
       4 . A gas combustion apparatus as claimed in  claim 2 , wherein a radiation shield is provided between the nitrogen oxide reduction section and the second combustion section.