Blow-pipe structure

Abstract

Provided is a blow-pipe structure for a blast furnace facility configured so as to be capable of suppressing slag adhesion by using a simple structure, even if pulverized coal with an unadjusted softening temperature is used. The blow-pipe structure is attached to a tuyere in a blast furnace main body that produces pig iron from iron ore. The blow-pipe structure injects auxiliary fuel pulverized coal together with hot air and slag from the pulverized coal containing a component that is melted by the hot air and/or heat from the combustion of the pulverized coal combustion heat. The blow-pipe structure has an internal/external double pipe structure having an internal pipe that continues from a header pipe that supplies the hot air, to the vicinity of the tuyere and opens, said internal pipe being provided inside an external pipe that continues from the header pipe to the tuyere.

1 . A blow-pipe structure attached to a tuyere for a main blast furnace body that produces pig iron from iron ore, the blow-pipe structure injecting pulverized coal as an auxiliary fuel along with hot air, slag from the pulverized coal containing a component that is melted by the hot air and/or heat from the combustion of the pulverized coal combustion heat;
 the structure being an internal/external double pipe structure in which an internal pipe that continues from a header pipe, which supplies the hot air, to the vicinity of a tuyere and opens is provided inside an external pipe that continues from the header pipe to the tuyere, and a pulverized coal outlet of an injection lance for introducing the pulverized coal opens to the interior of the internal pipe.   
     
     
         2 . The blow-pipe structure according to  claim 1 , wherein a flow path resisting element is provided at a position in a flow path formed between the external pipe and the internal pipe and near the outlet of the internal pipe. 
     
     
         3 . The blow-pipe structure according to  claim 1 , wherein a nitrogen injection pipe for supplying nitrogen to the internal pipe is provided. 
     
     
         4 . The blow-pipe structure according to  claim 1 , wherein an oxygen injection pipe for supplying oxygen to the external pipe is provided. 
     
     
         5 . The blow-pipe structure according to  claim 2 , wherein a nitrogen injection pipe for supplying nitrogen to the internal pipe is provided. 
     
     
         6 . The blow-pipe structure according to  claim 2 , wherein an oxygen injection pipe for supplying oxygen to the external pipe is provided. 
     
     
         7 . The blow-pipe structure according to  claim 3 , wherein an oxygen injection pipe for supplying oxygen to the external pipe is provided.