Coal bruquette manufacturing method and coal bruquette manufacturing apparatus

Abstract

A method and an apparatus for manufacturing coal briquettes capable of implementing excellent cold strength and hot strength by separating and crushing coal per each kind of coals are provided. In the manufacturing method of coal briquettes, the coal briquettes are charged into a dome part of a melter-gasifier to be rapidly heated in a manufacturing apparatus of molten iron including i) a melter-gasifier in which reduced iron is charged, and ii) a reducing furnace connected to the melter-gasifier and providing the reduced iron. The manufacturing method of coal briquettes includes: i) providing a plurality of kinds of coal; ii) storing the plurality of kinds of coal, respectively; iii) providing powdered coals by crushing the plurality of kinds of coal, respectively; iv) providing mixtures by mixing the powdered coal, a hardening agent, and a binder; and v) providing coal briquettes by molding the mixture.

1 . A method for manufacturing coal briquettes charged into a dome part of the melter-gasifier to be rapidly heated in an apparatus for manufacturing molten iron including a melter-gasifier into which reduced iron is charged, and a reducing furnace connected to the melter-gasifier and providing the reduced iron, the method comprising:
 providing a plurality of kinds of coal;   storing the plurality of kinds of coal, respectively;   providing powdered coals by crushing the plurality of kinds of coal, respectively;   providing mixtures by mixing the powdered coal, a hardening agent, and a binder; and   providing coal briquettes by molding the mixtures.   
     
     
         2 . The method of  claim 1  further comprising drying the plurality of kinds of powdered coals together. 
     
     
         3 . The method of  claim 2 , wherein a water standard deviation of the plurality of kinds of powdered coals is 0.3 or less. 
     
     
         4 . The method of  claim 1 , wherein, in the providing of the plurality of kinds of coal, among the plurality of kinds of coal, a plurality of kinds of coal having a difference between Hardgrove Crushability Indexes (HGIs) of 10 or less are mixed and provided together. 
     
     
         5 . The method of  claim 4 , wherein the difference between the HGIs among the plurality of kinds of coal is 5 or less. 
     
     
         6 . The method of  claim 1 , wherein the providing of the mixture comprises:
 uniformly mixing the powdered coals, and   providing and mixing the binder and the hardening agent with the uniformly mixed powdered coal.   
     
     
         7 . The method of  claim 1 , wherein in the providing of the powdered coals, a grain size of the powdered coals is greater than 0 mm and is 5 mm or less. 
     
     
         8 . The method of  claim 7 , wherein the grain size of the powdered coals is 1 mm to 3 mm. 
     
     
         9 . The method of  claim 1 , wherein in the providing of the powdered coals, the plurality of kinds of coals include first coal and second coal, and a crushing time of the first coal is different from the crushing time of the second coal. 
     
     
         10 . The method of  claim 9 , wherein the crushing time of the first coal is greater than that of the second coal, and a caking property of the first coal is smaller than that of the second coal. 
     
     
         11 . An apparatus for manufacturing coal briquettes, comprising:
 a plurality of coal storage tanks storing a plurality of kinds of coal;   a plurality of crushers connected to the plurality of coal storage tanks to provide powdered coals by crushing the plurality of kinds of coals, respectively;   a binder storage tank storing a binder;   a hardening agent storage tank storing a hardening agent;   a mixer providing mixtures by mixing the powdered coals provided from the plurality of crushers, the binder provided from the binder storage tank, and the hardening agent provided from the hardening agent storage tank; and   a molding machine molding the mixture by receiving the mixture from the mixer.   
     
     
         12 . The apparatus of  claim 11  further comprising a drier connected directly with the plurality of crushers to dry the powdered coals together.