Burner and coal upgrading plant

Abstract

Provided is a burner that includes: a tubular first outer cylinder ( 20 ); a diffuser ( 21 ) disposed inside the first outer cylinder ( 20 ) and having an inner circumferential surface, a diameter of which gradually increases in a first direction; a first gas nozzle ( 22 ) configured to feed a first gas to a radial outer region of the diffuser ( 21 ) in the first direction; a second gas nozzle ( 23 ) disposed adjacent to the first gas nozzle ( 22 ) in a circumferential direction of the first outer cylinder ( 20 ) and configured to feed a second gas to the radial outer region of the diffuser ( 21 ) in the first direction; and an ignition torch ( 24 ) configured to ignite at least one of the second gas and the first gas.

1 . A burner that simultaneously burns a first gas and a second gas having a higher calorific value than the first gas, the burner comprising:
 a tubular first outer cylinder having an opening through which primary air is fed in a first direction;   a diffuser disposed inside the first outer cylinder and having an inner circumferential surface, a diameter of which gradually increases in the first direction;   a first gas nozzle disposed inside the first outer cylinder and configured to feed the first gas to a radial outer region of the diffuser in the first direction;   a second gas nozzle disposed adjacent to the first gas nozzle in a circumferential direction of the first outer cylinder and configured to feed the second gas to the radial outer region of the diffuser in the first direction; and   an ignition torch disposed inside the first outer cylinder and configured to ignite at least one of the second gas and the first gas.   
     
     
         2 . The burner according to  claim 1 , wherein an opening end of the first gas nozzle in the first direction includes a contact portion configured to abut along an outermost circumferential portion of the diffuser. 
     
     
         3 . The burner according to  claim 2 , wherein:
 the burner includes a plurality of first gas nozzles; and   a sum of circumferential angle ranges within which each contact portion of the first gas nozzles come into contact with the diffuser ranges from 90 degrees to 200 degrees.   
     
     
         4 . The burner according to  claim 1 , wherein the second gas nozzle includes a flame holding pad that generates a vortex of the second gas at an opening end thereof in the first direction. 
     
     
         5 . The burner according to  claim 1 , further comprising a second outer cylinder disposed outside the first outer cylinder and configured to form a flow channel through which secondary air flows between the first outer cylinder and the second outer cylinder. 
     
     
         6 . The burner according to  claim 5 , further comprising swirlers disposed between the first outer cylinder and the second outer cylinder and configured to swirl the second air in a circumferential direction. 
     
     
         7 . The burner according to  claim 1 , further comprising a temperature drop reducing part configured to cover at least a part of an outer circumferential surface of the first gas nozzle and to prevent a drop in temperature of the first gas. 
     
     
         8 . A coal upgrading plant comprising a combustion furnace provided with the burner according to  claim 1 .