DEVICE FOR INJECTING SOLID PARTICULATE MATERIAL INTO VESSEL

摘要

PROBLEM TO BE SOLVED: To provide a metallurgical lance for injecting solid particulate materials into a smelting vessel. SOLUTION: This lance 27 has a central tube 31 allowing the passage of the solid materials and an annular cooling jacket 32 enclosing the central tube. The jacket 32 includes a long-sized annular structure 41 which is formed by outer and inner tubes 42 and 43 connected by a front end connector 44. A long- sized annular structure 45 is disposed in the structure 41 in order to divide the inside of the structure 41 to the inner side annular water passage 46 and the outer side outer side annular water passage 47. A long-sized annular structure 45 has a front end piece 49 fitted into the connector 44 of the structure 41 in order to form an annular end passage 51 for interconnecting the front ends of water passages 46 and 47. Cooling water flows forward through the water passage 46 and further flows outward around the passage 51 toward the outer passage 47 then to a water outlet 53 side. The effective sectional area of the water flow passing the passage 51 is smaller than the flow sectional area of the water passage 46 and 47 in order to obtain the high volume of the water in the front end region of the cooling jacket.