Pulverized-coal injection device, blast furnace facility provided with the same, and pulverized-coal supplying method

Abstract

A pulverized-coal injection device is configured so as to inject pulverized coal from a tuyere of a blast-furnace main unit) together with heated, compressed injection air, and upgraded coal that has a self-heating property and that is upgraded from low-grade coal is used as a raw material for the pulverized coal. In addition, a heat exchanger is provided as a heat transporting unit for transporting heat due to a self-heating effect of this upgraded coal to a site requiring heat. This heat exchanger heats intake air by using the heat due to the self-heating effect of the upgraded coal that passes through the pulverized-coal supplying pipe to perform heat exchange with, for example, air that is taken into an injection-air feeding device. Furthermore, a deactivating unit for deactivating the upgraded coal such that a predetermined level of the self-heating effect thereof is retained may be provided.

1 . A pulverized-coal injection device configured so as to inject pulverized coal from a tuyere of a blast-furnace main unit together with heated, compressed injection air,
 wherein upgraded coal that has a self-heating property and that is upgraded from low-grade coal is used as a raw material for the pulverized coal.   
     
     
         2 . A pulverized-coal injection device according to  claim 1 , comprising:
 a heat transporting unit for transporting heat due to a self-heating effect of the upgraded coal to a site requiring heat.   
     
     
         3 . A pulverized-coal injection device according to  claim 2 , wherein the heat transporting unit is configured so as to subject the injection air, before being compressed, to heat exchange with the upgraded coal. 
     
     
         4 . A pulverized-coal injection device according to  claim 2 , wherein the heat transporting unit is configured so as to transport the heat of the upgraded coal to a upgrading device that upgrades the low-grade coal. 
     
     
         5 . A pulverized-coal injection device according to  claim 1 , further comprising:
 a deactivating unit for deactivating the upgraded coal such that a predetermined level of a self-heating effect thereof is retained.   
     
     
         6 . A pulverized-coal injection device according to  claim 1 , comprising:
 a mixing portion for mixing pulverized coal constituted of the upgraded coal and pulverized coal constituted of generally used raw coal,   wherein the pulverized coal constituted of the raw coal is dried at the mixing portion and a downstream side thereof by using a self-heating effect of the upgraded coal.   
     
     
         7 . A blast furnace facility comprising a pulverized-coal injection device according to  claim 1 . 
     
     
         8 . A pulverized-coal supplying method for injecting pulverized coal from a tuyere of a blast-furnace main unit together with heated, compressed injection air, the pulverized-coal supplying method comprising:
 using upgraded coal upgraded from low-grade coal as a raw material for the pulverized coal; and   transporting heat due to a self-heating effect of the upgraded coal to a site requiring heat and utilizing the heat thereat.   
     
     
         9 . A pulverized-coal supplying method according to  claim 8 , further comprising:
 deactivating the upgraded coal such that a predetermined level of the self-heating effect thereof is retained.   
     
     
         10 . A pulverized-coal supplying method for injecting pulverized coal from a tuyere of a blast-furnace main unit together with heated, compressed injection air, the pulverized-coal supplying method comprising:
 mixing pulverized coal constituted of upgraded coal upgraded from low-grade coal and pulverized coal constituted of generally used raw coal; and   drying the pulverized coal constituted of the raw coal by means of a self-heating effect of the upgraded coal.   
     
     
         11 . A pulverized-coal injection device according to  claim 2 , further comprising:
 a deactivating unit for deactivating the upgraded coal such that a predetermined level of a self-heating effect thereof is retained.   
     
     
         12 . A pulverized-coal injection device according to  claim 3 , further comprising:
 a deactivating unit for deactivating the upgraded coal such that a predetermined level of a self-heating effect thereof is retained.   
     
     
         13 . A pulverized-coal injection device according to  claim 4 , further comprising:
 a deactivating unit for deactivating the upgraded coal such that a predetermined level of a self-heating effect thereof is retained.