Abstract:
PROBLEM TO BE SOLVED: To provide an elongate metallurgical lance for injecting solid particulate material into molten material held within a vessel.SOLUTION: In the metallurgical lance, (i) an annular cooling jacket includes an inner tube and an outer tube which are connected to each other by a front end connection part made of copper or copper alloy, (ii) an outer wall of a forward end part of a jacket is formed from a first material which includes copper or copper alloy and which has high heat transfer properties and can withstand external temperature higher than 1,100°C when the jacket is cooled with coolant flow, (iii) an outer wall of a body part of the jacket is formed from a second material which includes steel and which maintains its structural properties even when exposed to external temperature higher than 1,100°C when the jacket is cooled with coolant flow, whereby the outer wall acts as a structural member which contributes to supporting the lance at these temperatures, and (iv) the outer wall of the forward end part and the outer wall of the body part are welded together.
Abstract:
PROBLEM TO BE SOLVED: To provide a lance withstanding an extremely high temperature and allowing effective cooling at both the inside and an outer wall particularly at the lead-in end of the lance for injecting gas into a combustion zone of a metallurgical vessel. SOLUTION: This apparatus comprises a duct for injecting material; an inside inflow passage through which cooling water flows from the rear end of the duct to the front end, and an outside outflow passage through which the cooling water flows from the front end of the duct to the rear end, respectively extending through a duct wall; and an annular duct tip part disposed at the front end of the duct and connecting the inside and outside water passages to allow water to flow. The annular duct tip part comprises an annular inner end member, an annular outer end member, an annular central member arranged between the inner end member and outer end member, and a dividing device for dividing a space between the outer end member and the central member into individual radial passages. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a structure allowing an inside edge member of a duct tip member and an end component to be cooled well and having improved structural strength. SOLUTION: This apparatus for injecting gas into a vessel includes a gas flow duct 31 which receives hot gas passing through a gas inlet structure 32 at a rear end of the duct. An elongate central structure 33 extends throughout the length of duct 31 and carries a series of vanes 34 for imparting swirl to the gas flow exiting at the forward end of the duct. The forward end of duct 31 has an annular tip member 36 mounted thereat and cooling water flows into the tip member 36 through passages 43 and 44 in the wall of duct 31. The tip member 36 comprise a hollow shell internally divided by a partitioning structure to form a series of water flow galleries. The respective galleries extend circumferentially around the tip member 36 and are interconnected for flow of cooling water sequentially through the galleries from the water supply passage 43 to the water return passage 44. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a direct smelting process and an apparatus therefor for producing a molten metal from an iron-containing material that can achieve a high efficiency for heat transfer.SOLUTION: A feed material which includes a solid material and a carrier gas is injected into molten baths 22 and 23 at a velocity of at least 40 m/s through a solid injection lance 27 arranged so that the central axis is at an angle of 20 to 90 degrees downward with respect to the horizontal axis. The feed material injection generates a surface 25 gas flow of at least 0.04 Nm/s/min the molten baths 22 and 23 at least in part by reactions of the material injected in the baths 22 and 23. The gas flow causes the molten material to be projected upwardly as splashes, droplets and streams, and forms an expanded molten bath zone 28, with the gas flow and the upwardly projected molten material causing substantial movement of the material in the molten bath 23 and strong mixing of the molten bath 23.
Abstract:
PROBLEM TO BE SOLVED: To provide a gas swirl generator capable of inducing swirl with reduced turbulent flow. SOLUTION: An apparatus for injecting gas into a vessel is disclosed. The apparatus may include a gas flow duct 31 and a central body 33 within a forward end region of the duct to form an annular nozzle for exhausting gas from the duct. A plurality of flow directing vanes 91 are arranged about the central body to impart swirl to a gas flow through the nozzle. The flow directing vanes have substantially straight leading end portions 91A radiating outwardly from the central body and extending along the duct. The vanes also have substantially helical trailing end portions 91C extending helically about the central body toward the front end of the duct and transition portions 91B joining the leading end portions to the trailing end portions. The transition portions are shaped to merge smoothly with both the leading end portions and the trailing end portions and to smoothly and progressively change shape between them. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a supply means of solid feed materials having efficiency and reliability for injecting the solid feed materials into a direct smelting vessel during Hismelt (R) process operation. SOLUTION: A solid material feeding means 31 for injecting the solid feed materials, that is, carbonaceous materials into a direct smelting vessel SRV as a facility, independently feeds the carbonaceous materials into the plurality of injecting lances 7a, 7b. The independent supply of the carbonaceous materials minimizes the possible adverse impact of breakdowns of the carbonaceous material injection means for one or more of lances or of one or more lances. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an effective facility arrangement for separating and arranging a plurality of facilities having various functions into different regions of a vessel circumference, minimizing a possibility of interference between the various functions, and maximizing the safety of smelting working in a smelting device.SOLUTION: An oxidation gas delivery duct means 31 and an exhaust gas duct means 32 are extended in a first region out of at least three individual regions arranged in the circumference of a fixed smelting vessel 11 and extended outward for the fixed smelting vessel. A metal discharge means and a metal discharge gutter means 34 are arranged in a second region out of the three regions, and a slag sampling means and a slag sampling gutter means 46 are arranged in a third region out of the three regions.
Abstract:
PROBLEM TO BE SOLVED: To provide a direct smelting method obtained by improving the conventional Hismelt-method. SOLUTION: Lance/tuyere are inserted deep into the bath and oxygen for post-combustion of unoxidized reaction gas is supplied and in addition, splashes, droplets and streams of molten metal, are spouted up in the transition zone, and the effective heat-conduction is performed to the bath from the post-combustion zone by dropping down these again into the bath. The level of dissolved carbon in the bath is maintained to ≥3%, desirably >4%, and FeO content in the slag is maintained to 3 and the primary post-combustion is set at >40%, desirably >50% or >60%. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve a cooling capacity of a lance for injecting gas into a metallurgical vessel at high temperature. SOLUTION: An apparatus includes a passage for flowing in which cooling water flows from the rear end part to the front end part of respective ducts in the inside and the outside extended through the duct for injecting the material and an annular duct tip end part arranged at the front end part of the duct so that the water flows by connecting the interval between the water flowing passages at the inside and the outside. The flowing passages for cooling water at the inside and the outside, are constituted so that the flowing-out water from the tip end part of the annular duct to the rear end part of the duct travels through a longer flowing passage than the flowing-in water flowing from the rear end part of the duct to the tip end part of the annular duct. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an improved construction which achieves effective cooling of both swirl vanes and a forward nose portion of a central structure. SOLUTION: An apparatus 26 for injecting gas into a metallurgical vessel comprises a gas flow duct 31, an elongate control tubular structure 33 extending within the gas flow duct, the plurality of flow directing swirl vanes 34, a cooling water inflow passage 43 and a cooling water outflow passage 44 within the center structure and the nose portion 36 provided with one or more water flow passages. The flow directing vanes are provided with an internal water cooling vane passages 84. The water flow is communicated through the vane passage from the cooling water inflow passage in the central structure to the water flow passage in the nose portion of the central structure and thus, at least some of the inflow water is passed through the vane passage and the water flow passage in the nose portion and thence, to the outflow passage. COPYRIGHT: (C)2009,JPO&INPIT