Tuyere for Manufacturing Molten Iron and Method for Injecting Gas Using the Same

Abstract

A tuyere for manufacturing molten iron is provided. The tuyere includes i) an oxygen injection opening that is configured to inject oxygen therethrough, and ii) a sealing gas injection opening that is located to be spaced apart from the oxygen injection opening and is configured to inject a sealing gas surrounding the oxygen.

1 . A tuyere that is used for manufacturing molten iron, the tuyere comprising:
 an oxygen injection opening that is configured to inject oxygen therethrough; and   a sealing gas injection opening that is spaced apart from the oxygen injecting opening and is configured to inject a sealing gas surrounding the oxygen.   
     
     
         2 . The tuyere of  claim 1 , wherein the tuyere further comprises:
 a first end portion through which the oxygen injection opening is exposed; and   a second end portion through which the sealing gas injection opening is exposed and surrounding the first end portion.   
     
     
         3 . The tuyere of  claim 2 , wherein the first end portion is shaped to have a concave groove. 
     
     
         4 . The tuyere of  claim 2 , wherein the sealing gas injection opening comprises a plurality of nozzles through which the sealing gas is injected. 
     
     
         5 . The tuyere of  claim 4 , wherein the plurality of nozzles are spaced apart from each other at substantially equal intervals. 
     
     
         6 . The tuyere of  claim 4 , wherein the sealing gas injection opening further comprises:
 a sealing gas supply tube to which the sealing gas is supplied, the sealing gas supply tube being extended along one direction; and   a sealing gas header connecting the plurality of nozzles and the sealing gas supply tube with each other.   
     
     
         7 . The tuyere of  claim 6 , wherein the sealing gas header is formed to have a ring shape. 
     
     
         8 . The tuyere of  claim 6 , further comprising an auxiliary fuel injection opening that is spaced apart from the oxygen injection opening and through which an auxiliary fuel is injected, and
 wherein the oxygen injection opening is located between the sealing gas injection opening and the auxiliary fuel injection opening.   
     
     
         9 . The tuyere of  claim 4 , wherein one or more nozzles among the plurality of nozzles is formed to be extended to make an acute angle with a direction along which the oxygen injection opening is extended. 
     
     
         10 . The tuyere of  claim 9 , wherein the acute angle is in a range from 5 degrees to 60 degrees. 
     
     
         11 . The tuyere of  claim 4 , wherein a cross-section of the nozzle cut along a width direction of the tuyere becomes larger when becoming closer to the second end portion. 
     
     
         12 . The tuyere of  claim 1 , wherein the oxygen injected through the oxygen injection opening and the sealing gas injected through the sealing gas injection opening make an acute angle. 
     
     
         13 . The tuyere of  claim 12 , wherein the acute angle is in a range of 5 degrees to 60 degrees. 
     
     
         14 . The tuyere of  claim 1 , further comprising an auxiliary fuel injection opening through which an auxiliary fuel is injected and that is located to be spaced apart from the oxygen injection opening. 
     
     
         15 . The tuyere of  claim 14 , wherein the auxiliary fuel is a fine carbonaceous material or a hydrocarbon-containing gas. 
     
     
         16 . The tuyere of  claim 1 , wherein the tuyere further comprises:
 a first end portion at which the oxygen injection portion is formed; and   a second end portion that surrounds the first end portion, and at which the sealing gas injection opening is formed,   wherein the first end portion and the second end portion are located at the same plane.   
     
     
         17 . The tuyere of  claim 1 , wherein the sealing gas is at least one gas selected from a group of compressed air, oxygen with a low concentration, and an inert gas. 
     
     
         18 . The tuyere of  claim 17 , wherein the inert gas is nitrogen gas if the sealing gas comprises the inert gas. 
     
     
         19 . The tuyere of  claim 1 , wherein the tuyere is installed at a side portion of a melter-gasifier that manufactures molten iron such that the sealing gas prevents charged materials in the melter-gasifier from reacting with the oxygen at an end portion of the tuyere. 
     
     
         20 . A method for injecting gas, comprising:
 injecting oxygen into a melter-gasifier through a tuyere installed at the melter-gasifier;   injecting sealing gas into the melter-gasifier through the tuyere; and   surrounding the oxygen with the sealing gas while the sealing gas is injected into the melter-gasifier.   
     
     
         21 . The method of  claim 20  further comprising preventing the charged materials in the melter-gasifier from reacting with the oxygen by the sealing gas. 
     
     
         22 . The method of  claim 20 , wherein the sealing gas is injected to make an acute angle with the oxygen during the injection of the sealing gas. 
     
     
         23 . The method of  claim 22 , wherein the acute angle is in a range of 5 degrees to 60 degrees. 
     
     
         24 . The method of  claim 20  further comprising injecting an auxiliary fuel into the melter-gasifier through the tuyere. 
     
     
         25 . The method of  claim 24 , wherein the auxiliary fuel is a fine carbonaceous material or hydrocarbon containing gas. 
     
     
         26 . The method of  claim 20 , wherein the sealing gas is at least one gas selected from a group of compressed air, oxygen with a low concentration, and an inert gas during the injection of the sealing gas. 
     
     
         27 . The method of  claim 26 , wherein the inert gas is nitrogen gas if the sealing gas comprises the inert gas.