Multi-purpose, multi-oxy-fuel, power burner/injector/oxygen lance device

Abstract

A multi-purpose, multi-oxy-fuel High Temperature Power Burner/Injector/Oxygen Lance, Mechanical System Apparatus Device, for steelmaking from recycled scrap and/or virgin ferrous charge, which can be employed in multi-oxy-fuel (natural gas; pulverized carbonaceous matter; heavy oil), especially by Oxygen Combusted mixture of Natural Gas/Pulverized Carbonaceous Matter in High Temperature Power Burner Mode, for efficient and rapid melting of solid ferrous charge (cold or preheated) in a special steelmaking Metallurgical Furnace or Open Hearth Furnace, Tandem Furnace, BOF, EAF, as its augmenting or only source of thermal energy; more than one Device in Oxygen-Natural Gas/Pulverized Carbonaceous Matter Power Burner Mode, can be employed as the only source of thermal energy in a modified, originally Electric Arc Furnace, as total replacement of Graphite Electrodes and Electric Arc System, the replacement being noticeably more primary energy efficient than the thermal energy provided by Graphite Electrode/Arc System; it also can be employed in an Solid Particles Injector Mode, for injecting of adequately granulated carbonaceous materials or lime into the molten steel for its carburizing or for foamy slag control; further it can be employed in a natural gas shrouded, pulsating oxygen stream, for vertically to the charge oriented soft blow supersonic Oxygen Injection Lance Mode, for decarburization of the molten metal contained in the hearth of the metallurgical furnace and foamy slag control; in one of the embodiments—generally arcuate—pivotally mounted, liquid media cooled composite body, is pivoted into and out of a furnace vessel through a small opening in the shell wall for auto-regulated constant optimal positioning of the Composite Body Tip against solid or molten charge, in each and all multi-purpose modes; furthermore, when inserted into the furnace vessel, the arcuate composite body can be rotated about its longitudinal axis for directing the oxy-fuel high temperature flame towards unmolten charge in the furnace; in an other—generally linear—embodiment, the liquid cooled composite body is attached to the mast type carrier allowing vertical movement of the composite body which enters the furnace vessel through a small opening in the furnace roof; the bimetallic, liquid cooled special tip assembly of both—arcuate and linear embodiments—of the composite body includes easy replaceable, independent, multi-opening nozzles, mounted in a protective, retracted position inside of the liquid cooled special tip assembly.

What is claimed is:  
     
         1 . A system and method of operating a steelmaking metallurgical furnace for melting solid metallic charge and super heating already molten metallic charge, by efficiently combusting with oxygen a mixture of—or each separately—natural gas, pulverized coal or heavy oil, decarburizing of molten metallic charge by soft blow supersonic velocity of the oxygen rich gas via one or more converging/diverging nozzles coaxially shrouded with combustible gas via coaxially to converging/diverging oxygen nozzles arranged soft blow supersonic or subsonic velocity nozzles, and also injecting solid carbonaceous materials and other metallurgical additives via gaseous transporting medium: 
 (I) providing a metallurgical furnace having a furnace shell wall a furnace refractory bottom and a furnace roof, with a metallurgical charge housed therein,  
 (II) providing a multi-purpose, multi-ox-fuel apparatus combination of power burner/oxygen lance/solid materials injector device comprising: 
 In one preferred embodiments, a liquid cooled, arcuate composite body, having an inlet end and an outlet end;  
 a rotating supporting arm member, said arcuate composite body being supported by the said arm member adjacent to the said inlet end;  
 a base frame, said supporting arm member being connected to the said base frame via rotating pivot arrangement;  
 a hydraulic cylinder connected between the said rotating supporting arm member and said base frame, construing means for rotation of the said supporting arm member with supported arcuate composite body around rotating pivotal arrangement, relative to the said base frame in an arcuate path between a lowered and raised position of the supporting arm member;  
 said liquid cooled, arcuate composite body having therein, coaxially to the arcuate centre line arranged several passages created by pipes of appropriate diameter and wall thickness for conveying from said inlet end to the said outlet end with special tip assembly of the composite arcuate body pulverized coal, natural gas, oxygen, cooling liquid inn passage and cooling liquid out passages;  
 said generally most central passage of the composite arcuate body for flow and conveying of pulverized carbonaceous material and/or calcined dolomitic lime via flow of pressurized gaseous media, said generally most central passage extending from said inlet end of the composite arcuate body to the said outlet end in the main nozzle of the special tip assembly;  
 said generally second passage from the centre of the composite arcuate body for sole flow of combustion oxygen, said generally second passage from the centre extending from the said oxygen inlet end of the composite arcuate body to the said outlet end into the entrance of the converging side of the converging/diverging nozzles of the main nozzle body of the special tip assembly;  
 said generally third passage from the centre of the composite arcuate body for sole flow of combustible gas, preferably natural gas, said generally third passage from the centre extending from the said natural gas inlet end of the composite arcuate body to the said outlet end into the entrance of the more than one tubular nozzles of the intermediate nozzle of the special tip assembly;  
 said liquid coolant in-flow passage and a liquid coolant out-flow passage extending from said inlet end to said outlet end in spaced apart concentric side-by-side relationship and surrounding all other passages, closer to the centre of the composite arcuate body;  
 said by liquid cooled special tip assembly, its outer body connected permanently to the outlets end of the composite arcuate body, its assembly being of simple, highly functional design and allowing simple, easy and expedient replacement of the eventually worn out main and intermediate nozzle bodies, by only screwing out the particular worn out nozzle body and screwing in a new appropriate nozzle body, made to specification;  
 said both easy to replace nozzle bodies arranged in recessed position in relation to the liquid cooled tip of the outer body;  
 said lower edge of the by liquid cooled special tip assembly outer body, made of high thermally conductive material being protected by adequate thickness layer of hard material/s;  
 
 (III) providing a multi-purpose, multi-oxy-fuel apparatus combination of power burner/oxygen lance/solid materials injector device comprising: 
 in another preferred embodiment, this being a liquid cooled, generally vertically oriented straight linear composite body, having an inlet end and an outlet end, the outlet end of the linear composite body being oriented downwards, toward the solid or molten charge in the refractory lined bottom of the furnace vessel shell;  
 a straight, generally horizontally extended and positioned composite tubular the special type arm, connected by a sliding screwed connection at the inlet end of the arm to the vertical repositioning extension—mast;  
 a vertical repositioning extension—mast, of rugged steel structure, in the preferred embodiment being vertically repositioned by a hydraulic cylinder while accurately guided up and down via special adjustable guide rollers, the rollers attached to the stationary superstructure base frame located in close proximity of the furnace vessel shell;  
 said liquid cooled generally vertically oriented and straight linear composite body having therein, coaxially to the straight and linear centre line arranged several passages created by pipes of appropriate diameter and wall thickness for conveying from said inlet end to the said outlet end with special tip assembly of the composite straight and linear body the pulverized coal, natural gas, oxygen, cooling liquid inn passage and cooling liquid out passages;  
 said generally most central passage of the composite straight linear body for flow and conveying of pulverized carbonaceous material and/or calcined dolomitic lime via flow of pressurized gaseous media, said generally most central passage extending from said inlet end of the composite straight linear body to the said outlet end in the main nozzle of the special tip assembly;  
 said generally second passage from the centre of the composite straight linear body for sole flow of combustion oxygen, said generally second passage from the centre extending from the said oxygen inlet end of the composite straight linear body to the said outlet end into the entrance of the converging side of the converging/diverging nozzles of the main nozzle body of the special tip assembly;  
 said generally third passage from the centre of the composite straight linear body for sole flow of combustible gas, preferably natural gas, said generally third passage from the centre extending from the said natural gas inlet end of the composite straight linear body to the said outlet end into the entrance of the more than one tubular nozzles of the intermediate nozzle of the special tip assembly;  
 said liquid coolant in-flow passage and a liquid coolant out-flow passage extending from said inlet end to said outlet end in spaced apart concentric side-by-side relationship and surrounding all other passages, closer to the centre of the composite straight linear body;  
 said by liquid cooled special tip assembly, its outer body connected permanently to the outlets end of the composite straight linear body, its assembly being of simple, highly functional design and allowing simple, easy and expedient replacement of the eventually worn out main and intermediate nozzle bodies, by only screwing out the particular worn out nozzle body and screwing in a new appropriate nozzle body, made to specification;  
 said both easy to replace nozzle bodies arranged in recessed position in relation to the liquid cooled tip of the outer body;  
 said lower edge of the by liquid cooled special tip assembly outer body, made of high thermally conductive material being protected by adequate thickness layer of hard material/s;