| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 373060000 | ARC FURNACE DEVICE | 56 |
| 20110286490 | Method of Producing Activated Carbon Material - A method for producing an activated carbon material, such as a tape or belt of carbon fibres, includes within a reaction chamber causing relative movement between a carbon-containing substrate and an electric arc in a gap between two electrodes or adjacent an electrode so that an electric arc exists between the electrode and the substrate to heat the substrate to a substrate surface temperature effective to activate the carbon-containing substrate and above about 3750K. The activated material has high adsorbency, and increased capacitance and conductivity. | 11-24-2011 |
| 20110292961 | METHOD AND DEVICE FOR CONTROLLING A CARBON MONOXIDE OUTPUT OF AN ELECTRIC ARC LIGHT OVEN - In a method and a device for controlling a carbon monoxide output of an electric arc oven, comprising an oven container, an arrangement for determining a height of a foamed slag in at least three zones of the oven container on the basis of a solid-borne sound measurement, at least one first device for controlling an oxygen infeed, and at least one second device for controlling a carbon infeed into the oven container, the height of the foamed slag is determined in each of the at least three zones and associated with a carbon monoxide content in the exhaust gas of the electric arc oven, wherein the carbon infeed and/or the oxygen infeed in at least one of the at least three zones is controlled such that the height of the foamed slag is maintained below a maximum value. | 12-01-2011 |
| 20120140787 | METHOD AND DEVICE FOR DETERMINING A TEMPERATURE T OF A METAL MELT WITHOUT CONTACT - A temperature T of a metal melt in a furnace is precisely determined without contact using at least one burner gun unit fed through a furnace wall of the furnace above the metal melt into a furnace chamber and at least one temperature measuring unit downstream of the burner gun unit. | 06-07-2012 |
| 20080232423 | Method, System and Process for Preparing a Recyclable Material - A method for preparing material comprising the steps of providing a transport vehicle including a horizontal ejector and a basin that defines an opening, wherein the horizontal ejector is coupled to the material within the basin; loading a first material into the basin proximate the horizontal ejector; loading a second material into the basin proximate the opening; actuating the horizontal ejector for movement from a retracted position toward a deployed position; and horizontally ejecting the second material through the opening and then subsequently horizontally ejecting the first material through the opening. A system is also disclosed. | 09-25-2008 |
| 20110013662 | PROCESS AND PLANT FOR THE THERMAL TREATMENT OF FINE-GRAINED SOLIDS - A process for at least one of a chemical and a physical treatment of fluidizable substances in a reactor. The process includes introducing a hot gas into an interior of the reactor through a gas supply tube and cooling at least one of the hot gas and the gas supply tube with a coolant. The cooling is performed by contacting the hot gas with the coolant so as to provide a temperature of a wall of the gas supply tube at least 50° C. lower than a temperature of the gas at an inlet of the gas supply tube facing away from the interior of the reactor. | 01-20-2011 |
| 20110007773 | METHOD FOR OPERATING AN ARC FURNACE COMPRISING AT LEAST ONE ELECTRODE, REGULATING AND/OR CONTROL DEVICE, MACHINE-READABLE PROGRAM CODE, DATA CARRIER AND ARC FURNACE FOR CARRYING OUT SAID METHOD - In a method for operating an arc furnace ( | 01-13-2011 |
| 373067000 | Ingot remelting | 1 |
| 373069000 | With electrode holder or guide | 1 |
| 20090010299 | Apparatus for Adjusting an Electrode for a Metallurgical Furnace - In an apparatus ( | 01-08-2009 |
| 373071000 | Furnace body detail | 12 |
| 20110038391 | ARC METALLURGIC FURNACE SLAGGING DOOR - An arc metallurgic furnace slagging door comprising a lower slag removing-pushing movable panel ( | 02-17-2011 |
| 20100118910 | SILL AND DOOR JAMB ASSEMBLY FOR ELECTRIC ARC FURNACE - A sill and door jamb assembly providing an opening in an electric arc furnace. A shell comprised of side walls and a lower bowl and a refractory layer lining the bowl and side walls. The refractory layer includes continuous courses of refractory bricks along the inner surface of the side walls of the shell. The sill and door jamb assembly is comprised of a sill block assembly and two jamb block assemblies. The sill block assembly is comprised of side-by-side sill blocks, each of the sill blocks having an upper end with an upper surface, a lower end with a lower surface, and an inner surface facing the interior of the furnace. The sill blocks being positioned side-by-side to form the sill block assembly and having an upper end and a lower end. The lower end of the sill block assembly is confined within a plurality of courses of the refractory bricks. Each jamb block assembly is comprised of a plurality of jamb blocks positioned side-by-side. Each of the jamb block assemblies has a lower end supported by the plurality of courses of refractory bricks, and inner surfaces abutting the distal ends of the sill block assembly. The inner surfaces of the jamb block assemblies and the upper surface of the sill block assembly form the slag opening in the furnace. | 05-13-2010 |
| 20090245319 | Burner/Injector Panel Apparatus - The present invention generally relates to an apparatus and method for use in metal melting, refining and/or other processing, such as, for example, steel making in an electric arc furnace (EAF), and more particularly, to improved burner/injector panels and related methods for the introduction of various energy sources, such as, for example, chemical energy, oxygen and particulates into an EAF. | 10-01-2009 |
| 20090274190 | MELTING FURNACE, IN PARTICULAR ELECTRIC ARC FURNACE - In order to design the accommodation space of the furnace vessel of a melting furnace to be variable, so that it is adaptable to various volumes, which are required for different feedstocks (light scrap, heavy scrap) to achieve the tapping weight intended for the melting furnace, the cylindrical upper vessel part ( | 11-05-2009 |
| 373072000 | Hearth or crucible | 3 |
| 20120224601 | BURNER AND/OR INJECTOR PANEL APPARATUS, METHODS OF INSTALLATION AND USE OF THE SAME IN A METAL-MELTING FURNACE, AND METAL-MELTING FURNACE INCLUDING THE SAME - A burner and/or injector panel apparatus includes a flange rotatable within a cylindrical aperture in a horizontal plate and securely retainable between one or more retaining clips and the plate. Extending downward from the flange is a main body with a cylindrical chamber. A burner, burner/injector, or injector is contained within the cylindrical chamber. The main body has a helical cooling circuit extending around the cylindrical chamber and burner and/or injector. The burner and/or injector panel apparatus may be installed through a furnace wall, especially an electric arc furnace, more particularly, a balcony panel of a sump area of an electric arc furnace. The burner and/or injector panel apparatus may be tilted from horizontal or rotated around its vertical axis in order to better target a target area of a molten bath of metal with a flame, jet of oxygen, or stream of carbon particles. | 09-06-2012 |
| 20080317085 | Lining for Carbothermic Reduction Furnace - An inner lining for the steel shell of a carbothermic reduction furnace for the production of alumina has a base layer of graphite and a coating layer of refractory material. The refractory material is corundum (Al | 12-25-2008 |
| 20080232424 | Hearth plate including side walls defining a processing volume - A hearth plate ( | 09-25-2008 |
| 373073000 | Roof | 3 |
| 20090168831 | ELECTRIC ARC FURNACE ROOF TOP AND CENTRAL PORTION FOR THIS ROOF TOP - An electric arc roof furnace top contains a central portion and a peripheral portion surrounding the central portion. Each of these portions has an inner surface suitable for facing the furnace inner space. The inner surfaces of the peripheral and central portions form together a step so as to raise the inner surface of the central portion in relation to the inner surface of the peripheral portion with respect to the furnace inner space. | 07-02-2009 |
| 20110243179 | Roof System for Electric Arc Furnace and Method for Manufacturing the Same - A roof system for an electric arc furnace includes a skew removably attached to the electric arc furnace, a lining of refractory material affixed to the skew, and a delta composed of a refractory material. The delta has at least one aperture capable of receiving an electrode. The delta fits onto and is supported by the refractory lining that is affixed to the skew. | 10-06-2011 |
| 20120134384 | Electric Arc Furnace - This invention concerns an electric arc furnace comprising a chamber suitable for containing molten steel; a roof suitable for covering the chamber and for containing a mass of scrap steel; electrodes suitable for melting the mass of scrap, and means of support on a base. The latter means are such as to support the chamber and permit its oscillation around a horizontal axis of rotation. The roof and the chamber are counterprofiled in correspondence to the respective interface walls to create a rotoidal type coupling with regard to the axis of rotation. The roof, during oscillation of the chamber, remains fixed with regard to the base as well as in a closed position with regard to the chamber. | 05-31-2012 |
| 373075000 | Sidewall | 2 |
| 373076000 | With cooling | 2 |
| 20090129428 | COOLING DEVICE FOR USE IN AN ELECTRIC ARC FURNACE - A cooling device for use in an electric arc furnace is provided. The cooling device provides a novel and effective method for cooling burners, lances, enclosures, and other devices used in high heat environments, such as in Electric Arc Furnaces. According to one aspect of the invention used in a steel making process in an electric arc furnace, a cooling tube is inserted into a cooling cavity in a burner. Cooling fluid is injected through the cooling tube into the cavity to cool the portions of the burner adjacent the cooling cavity. The cooling fluid is then extracted from the cavity through a concentric space between the cooling tube and the cooling cavity. According to another aspect of the present invention, a cooling fluid distribution flange is provided to distribute cooling fluid to a plurality of cooling tubes to inject cooling fluid into a plurality of associated cooling cavities. | 05-21-2009 |
| 20130016754 | INJECTOR COOLING BLOCK FOR HOLDING AT LEAST ONE INJECTORAANM Fehlemann; GereonAACI DusseldorfAACO DEAAGP Fehlemann; Gereon Dusseldorf DEAANM Lieftucht; DirkAACI LegdenAACO DEAAGP Lieftucht; Dirk Legden DE - The invention relates to an injector cooling block ( | 01-17-2013 |
| 373078000 | Plural furnace units | 1 |
| 20120320941 | WASTE HEAT RECOVERY STRUCTURE FOR STEEL MAKING ELECTRIC ARC FURNACES, STEEL MAKING ELECTRIC ARC FURNACE FACILITY, AND WASTE HEAT RECOVERY METHOD FOR STEEL MAKING ELECTRIC ARC FURNACES - A waste heat recovery structure includes a first exhaust gas flow path provided to each of steel making electric arc furnaces to discharge exhaust gas thereinto; a waste heat boiler disposed on the first exhaust gas flow path to recover waste heat as saturated steam from exhaust gas; a steam accumulator configured to store steam formed by confluence of saturated steam parts, each generated by the waste heat boiler; a steam super heater configured to turn steam into superheated steam by heating; a second exhaust gas flow path configured to lead exhaust gas from the waste heat boiler to the steam super heater to use it for superheating; a third exhaust gas flow path configured to discharge exhaust gas from the waste heat boiler not through the steam super heater; and a switching device configured to switch flow paths between the second and third exhaust gas flow paths. | 12-20-2012 |
| 373079000 | Charging or discharging | 2 |
| 20080267249 | METHOD TO CONTROL THE FEED OF THE METAL CHARGE FOR ELECTRIC ARC FURNACES - A method is provided to control the feed of a metal charge into an electric arc furnace having at least one electrode to generate an electric arc to melt metals. The method includes: a step of defining a “cover index CI” of the electric arc by the slag present above the liquid metal bath, in order to calculate which of the harmonics present in an electric feed quantity of the furnace are taken into consideration; a step of measuring the actual cover index CI value during a functioning cycle of the furnace; and a step of adjusting the speed of feed of the metal charge into the furnace based on the measured value of the cover index CI. | 10-30-2008 |
| 373080000 | With charge pre-heating | 1 |
| 20080267250 | Equipment for Measurement and Control of Load Material or Scrap Feeding Into a Furnace and Relative Method - An equipment for the measurement and control of load material and scrap metal feeding into an electrical arc furnace, including an automatic control device for feeding control of load material or scrap according to the energy supplied to the bath, and a measuring device for the added load material, in correlation with the automatic control device, comprising a weighing device for the furnace shell, its contents and any other components it may support. | 10-30-2008 |
| 373088000 | Electrode | 11 |
| 20110280274 | Reduced Puffing Needle Coke From Decant Oil - A reduced puffing needle coke is formed from decant oil, which includes a lesser amount of nitrogen within the coke so that carbon articles produced from such coke experience minimal expansion upon heating to graphitization temperatures. | 11-17-2011 |
| 20110280275 | Reduced Puffing Needle Coke From Coal Tar Distillate - A reduced puffing needle coke is formed, which includes a reduced nitrogen content within the coke so that the coke particles do not experience as much puffing during the formation of graphitized carbon articles produced from such coke upon heating to graphitization temperatures. | 11-17-2011 |
| 20120106588 | Pool power-based apparatus to control vacuum arc remelting processes - An apparatus for controlling a vacuum remelting furnace comprising a controller capable of adjusting electrical current to an electrode and a controller capable of adjusting the electrode's drive speed. The controllers adjust the current and drive speed based on a predetermined pool power reference value. The apparatus may also comprise a third controller that receives the adjusted current and drive speed as inputs and sends estimated electrode drive speed bias as output to the drive speed controller and estimated current bias as output to the current controller. | 05-03-2012 |
| 20110268146 | GRAPHITE ELECTRODE WITH AN ELECTRICAL CONNECTING ELEMENT - The invention relates to a graphite electrode with an electrical connecting element as well as to a furnace for graphitizing carbon-containing materials by means of such graphite electrodes. According to the invention, it was found that the drawbacks known from the prior art are eliminated by establishing an electrical connection between the graphite electrode and the connecting element by means of wedge-shaped contacting elements. The contact pressure between the contact element and the wedge-shaped surface on the graphite electrode required for electrical conductivity of the interface can be influenced by means of the wedge angle and the contact surface. | 11-03-2011 |
| 20080247440 | Long Length Electrodes - An embodiment disclosed herein includes a monolithic graphite electrode. The electrode has a main body having a length of more than 3050 mm. Another embodiment disclosed herein includes an electrode column comprising a plurality of monolithic graphite electrodes. The column has a length of more than 3050 mm of electrode per joint. A further embodiment discussed herein is the practice of increasing the length of the electrode to minimize the occurrence of an electrode joint in the electrode column for a given length. This practice will improve efficiencies for both electrode manufacturers as well as electric arc furnace operators. | 10-09-2008 |
| 20120269225 | ELECTRODE FOR DIRECT CURRENT CONTINUOUS ARC FURNACE - Bottom electrode or anode for continuous direct current arc furnaces, provided with a cooling system which allows to improve the effectiveness of the cooling action of the bottom electrode, made in the shape of bimetallic billet, for the purpose of ensuring a sufficient height of the portion of said electrode which remains solid during the operation of the furnace, also when there is a very high electric load. | 10-25-2012 |
| 20120327968 | ELECTRODE ARM OF A METALLURGICAL MELTING FURNACE - The invention relates to an electrode arm ( | 12-27-2012 |
| 20110274136 | Reduced Puffing Needle Coke From Coal Tar - A reduced puffing needle coke is formed, which includes a lesser amount of nitrogen within the coke so that carbon articles produced from such coke experience minimal expansion upon heating to graphitization temperatures. | 11-10-2011 |
| 373091000 | Sectional | 3 |
| 20110194582 | Optimized Graphite Electrode Pin Configuration - A pin for use in connecting graphite electrodes into a joint, where the pin has at least one male tang having a tang factor, defined as the ratio of male tang length to diameter of the electrode into which hit is to be threaded, of at least about 1.0. | 08-11-2011 |
| 373092000 | With means to join sections | 2 |
| 20090010300 | Electrode Robot For Adding Electrodes Having Threaded Connectors of Various Thread Pitches - A device for adding graphite electrodes onto an electrode column is provided. This device, also known as an electrode robot, includes an engagement mechanism capable of being easily adapted to a plurality of thread pitches so that the device can add different electrodes having threaded connectors of different thread pitches. | 01-08-2009 |
| 20080304537 | Threaded Pin, Carbon Electrode, and Electrode Assembly - Carbon electrodes have at least one socket with an internal thread to be mated with a threaded pin having at least one external thread. Also such a threaded pin is provided for connecting to such carbon electrodes. The internal thread or external thread of the carbon electrodes and/or the pins are provided with non-load bearing abutment thread windings. | 12-11-2008 |
| 373094000 | Electrode support | 9 |
| 20130039379 | ELECTRODE SUPPORT ARM SYSTEM - The invention relates to an electrode support arm system for metallurgical furnaces, having an electrode arm ( | 02-14-2013 |
| 20100272146 | Lateral hoist for electrode columns of electric arc melting furnaces - A device for moving electrode columns of electric arc melting furnaces, characterised by consisting essentially of a lever the central fulcrum of which is connected to the hook of the overhead crane by an articulated ring, on one side a coupling mechanism being inserted into a tube and intended for coupling to the electrode column, while on the other side a counterweight of predetermined weight balances the device during its movement. | 10-28-2010 |
| 20090175309 | INDIVIDUAL SEGMENT COOLING DEVICE FOR THE ELECTRODES OF A METALLURGICAL FURNANCE - In a cooling device for electrodes of a metallurgical furnace, such as reduction furnace, electrical arc furnace, induction furnace, etc., which surrounds the electrodes and consists of individual segments ( | 07-09-2009 |
| 20120008661 | APPARATUS FOR MEASURING THE POSITION OF THE ELECTRODES IN AN ELECTRIC FURNACE - An apparatus for measuring the position of the electrodes in an electric furnace which envisages an electrode-holder column ( | 01-12-2012 |
| 20110274137 | Lateral hoist for electrode columns of electric arc melting furnaces - A device for moving electrode columns of electric arc melting furnaces, characterised by consisting essentially of a lever the central fulcrum of which is connected to the hook of the overhead crane by an articulated ring, on one side a coupling mechanism being inserted into a tube and intended for coupling to the electrode column, while on the other side a counterweight of predetermined weight balances the device during its movement. | 11-10-2011 |
| 373095000 | Seal | 1 |
| 20110090934 | SEALING DEVICE - A sealing device is arranged around a rod electrode extending vertically through an aperture made in the ceiling of an arc furnace and being vertically movable inside the furnace to prevent the access of gases from the furnace through the aperture to the atmosphere, and on the other hand to prevent air from flowing from the atmosphere into the furnace. The sealing device comprises a gas distribution chamber provided with an inlet channel for feeding essentially passive gas, such as nitrogen or air, into the gas distribution chamber. The sealing device also includes a slit nozzle encasing the electrode, through which nozzle a gas jet is arranged to be discharged from the gas distribution chamber towards the electrode in a direction that is at an angle with respect to the horizontal plane and has a slightly upwards inclined orientation, and that is, with respect to the furnace interior, pointed outwardly, so that the sealing is carried out owing to the effect of the created stagnation pressure. | 04-21-2011 |
| 373096000 | With electrode shield | 2 |
| 20080304538 | Safety Device For Detecting Electrode Breakage - The invention relates to a safety device ( | 12-11-2008 |
| 20100135351 | Cooling Device for the Electrodes of a Metallurgical Furnace - A cooling device ( | 06-03-2010 |
| 373098000 | Mast | 1 |
| 20090207877 | WALL ELEMENTS FOR WATER-COOLED, CURRENT-CONDUCTING ELECTRODE BEARING ARMS AND ELECTRODE BEARING ARMS PRODUCED FROM SUCH WALL ELEMENTS - The particular aim of the invention is cost-effective production of the wall elements for water-cooled, current-conducting electrode bearing arms, wherein wall elements have been developed which comprise a flat profile, which consists of an electrically conductive metal and into which at least one recess is incorporated on the side forming the outside of the electrode bearing arm, which recess extends over the length of the profile and is provided on the outside and the end side with a cover, which is combined with the flat profile by means of welding and provides a closed cooling channel, with in each case at least one inlet and at least one outlet for the cooling water flowing through the channel. The constituent parts of the wall elements can be produced in a cost-effective manner from continuous material, from which wall elements it is then also possible for electrode bearing arms to be produced in a cost-effective manner taking into consideration individual requirements for electrode bearing arms to be produced from the wall elements in terms of their dimensions. | 08-20-2009 |
| 373102000 | Power supply system | 14 |
| 20130121365 | Electrode Consumption Monitoring System - A method and system automatically determines when an electrode add event occurs in an electric arc furnace having a plurality of electrode columns, each carried by an electrode positioning system. Data is received correlating to the harmonic distortion of the electrical current output to the plurality of electrode columns. Data is also received correlating to control pressures in the electrode positioning systems. Steady state control pressure data is captured when the harmonic distortion data indicates a steady state condition. An electrode add event is thereafter determined when a pressure spike is identified in the steady state control pressure data. | 05-16-2013 |
| 20120314728 | SYSTEM AND METHOD TO DELIVER AND CONTROL POWER TO AN ARC FURNACE - A power supply system for an arc furnace includes a three phase transformer assembly, back to back SCRs coupled between a power source and the three phase transformer assembly primary windings, and three saturable-reactors, coupled between the three phase transformer assembly secondary windings and a load. A controlled DC current source is coupled between a system controller and each of said three saturable-reactors. The system controller is configured for monitoring the power source and an output current at the load, and for controlling the back-to-back SCRs and the current source. | 12-13-2012 |
| 373104000 | With power regulation | 11 |
| 20120183010 | METHOD FOR CONTROLLING A MELT PROCESS IN AN ARC FURNACE AND SIGNAL PROCESSING COMPONENT, PROGRAM CODE AND DATA MEDIUM FOR PERFORMING SAID METHOD - A method for controlling a melt process in an arc furnace and signal processing component, program code, and data medium for performing said method are provided. According to the method, sound signals or vibrations from the interior of the furnace container are captured by solid-borne sound sensors, from which characteristic values can be derived for the distribution of melting material, melt, and slag in the furnace fill. A characteristic value SM for thermal radiation impinging on the furnace wall of the container, a characteristic value M for the lumpiness of the melting material in the volume of furnace fill, and a characteristic value MM for the change to the portion of solid melting material contacting the furnace wall are generated in priority sequence. The energy distribution at the electrodes is changed by a control system analyzing the characteristic values in priority sequence, such that thermal load peaks are dampened or even completely prevented. To this end, the strand impedances stored as target values are modified. If the control is not sufficient, the thermal power of the arc is reduced as a subordinate means. A rapidly and reliably effective operating regime for the processes in the arc furnace can thereby be implemented. | 07-19-2012 |
| 20130083819 | METHOD FOR OPERATING AN ARC FURNACE, OSCILLATION MEASUREMENT DEVICE FOR AN ARC ELECTRODE AND CONFIGURATION FOR AN ARC FURNACE - A method for operating an arc furnace, an oscillation measurement device for an arc electrode, and a configuration for the arc furnace are described. Using simple measures for operating the arc furnace, it is possible to carry out, in a particularly safe and productive manner, an oscillation measurement on the at least one arc electrode. On the basis of which the operation of the configuration for the arc furnace can be controlled with regard to the mechanical and/or electrical operating parameters. | 04-04-2013 |
| 20090238234 | METHOD FOR OPERATING A MELT-METALLURGIC FURNACE, AND FURNACE - The invention relates to a method for operating a melt-metallurgic furnace ( | 09-24-2009 |
| 20100124247 | Sensor system for bottom electrodes of an electric arc furnace - A sensor system for monitoring and controlling the performance of the bottom electrode and the deflection of an electric arc in an electric steel making furnace includes an organized matrix of anode pins interspersed with refractory material and extending toward an electrically conductive plate secured to distal ends of the anode pins. A sensing device includes two temperature sensors at spaced apart locations along each of a distributed select group of anode pins for providing corresponding electrical signals and a current sensor responsive to electrical current flowing through the anode pins of the distributed select group of anode pins for providing a corresponding electrical signal. A controller responsive to the electrical signals derived at the anode pins of the select group operates the power supply and a display for monitoring the electrical performance of the elongated anode pins for heating by the electric arc in the furnace. | 05-20-2010 |
| 20080285615 | Method for Determining at Least One State Variable of an Electric Arc Furnace, and Electric Arc Furnace - In a method for determining a state variable of an electric arc furnace, especially for determining the level of the foamed slag ( | 11-20-2008 |
| 20110176575 | POWER SUPPLY SYSTEM FOR A POLYPHASE ARC FURNACE WITH AN INDIRECT CONVERTER BETWEEN A MAINS CONNECTION AND A FURNACE TRANSFORMER - In a power supply system for a three-phase arc furnace ( | 07-21-2011 |
| 20080198894 | Method For Regulating the Melting Process in an Electric-Arc Furnace - In a method for regulating the melting process in an electric-arc furnace ( | 08-21-2008 |
| 20110216802 | POWER SUPPLY ARRANGEMENT - A power supply arrangement for supplying a square-wave current (I | 09-08-2011 |
| 20120320942 | METHOD FOR OPERATING AN ARC FURNACE, CONTROL AND/OR REGULATING DEVICE FOR AN ARC FURNACE, AND ARC FURNACE - An arc furnace, a control and/or regulating device for an arc furnace, and a method for operating an arc furnace are provided, wherein an arc for melting metal is generated by at least one electrode, wherein an arc associated with the electrode(s) has a first radiation power based on preselected operating parameters, wherein the arc furnace is operated according to a predefined operating program based on an expected process sequence, wherein monitoring is performed to detect whether an undesirable deviation exists between the actual process sequence and the expected process sequence. Because a modified second radiation power is specified if a deviation is present, and a modified second set of operating parameters, e.g., impedance value(s), is determined based on the modified second radiation power, a method is provided that permits a minimal melting time while minimizing consumption of operating resources, e.g., with respect to arc furnace cooling. | 12-20-2012 |
| 20090219968 | CONTROL SYSTEM FOR AN ARC FURNACE - A control system for and method of controlling a vertical position of at least one electrode of an arc furnace, where the arc furnace comprises a furnace transformer having a primary, input side and a secondary, output side which is electrically connected to the at least one electrode, the control system comprising: at least one current-measuring device for measuring a current as drawn by the arc furnace; a voltage-measuring device for measuring a voltage as applied across the arc furnace; and a control unit for dynamically determining a setpoint for the vertical position of the at least one electrode based on the measured values of current and voltage, and providing an actuating output for driving a lifting arrangement to adjust the vertical position of the at least one electrode so as to follow the dynamically-determined setpoint. | 09-03-2009 |
| 373105000 | By changing arc length | 1 |
| 20090232181 | SYSTEMS AND METHODS FOR CONTROLLING THE ELECTRODE POSITION IN AN ARC FURNACE - Embodiments of a system for controlling the position of an electrode in an arc furnace comprise an arc furnace comprising a molten bath and slag disposed over the molten bath, wherein the slag contacts the molten bath at an interface. The system further comprises an electrode comprising a lower tip, wherein the electrode is configured to deliver current by disposing the lower tip of the electrode below the upper surface of the slag. The current is substantially directed through the slag to the interface. The system also comprises a control system configured to determine the position of the lower tip of the electrode relative to the upper surface of the slag based on harmonic frequencies associated with the current, wherein the lower tip position relative to the upper surface of the slag correlates to the harmonic frequencies. | 09-17-2009 |
| 373108000 | D.C. power | 1 |
| 20080298425 | Method and apparatus for melting metals using both alternating current and direct current - A furnace for melting metals includes a crucible, a direct current arc source and an induction coil powered by alternating current. The furnace is particularly useful for melting charges of highly reactive metals such as titanium, zirconium and their alloys without contaminating these charges. The direct current arc source melts generally from the inside out while the water-cooled induction coil serves to cool the crucible and form a skull along the crucible sidewall which protects the crucible from interacting with the molten metal. The induction coil is thus used for cooling as well as heating and stirring the melt, and helps control the thickness of the skull. | 12-04-2008 |
