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| Number | Title | Issue Date |
| 7295593 | System and method of minimizing loss of electrical conduction during input of feed material to a furnace The described methods and systems may be applied to electric arc furnace installations. In this context, the method and system provide an electrode position controller coupled to the feed rate controller so as to predictively anticipate the introduction of new sourc... | 11/13/2007 |
| 7257146 | System and method for controlling power across multiple electrodes in a furnace A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. The method and system also compensates for unbalance in multi-phase loads. A central controller monitors variable reactances in the loads and identifies situati... | 08/14/2007 |
| 7243701 | Treating molten metals by moving electric arc An apparatus (10) and a method for reducing inclusions, shrinkage blowholes, porosity and segregation in metal castings during the casting process, and for improving the grain structure, mechanical properties and yield of ingots and other castings. The appara... | 07/17/2007 |
| 7223014 | Remotely programmable integrated sensor transmitter A remotely programmable integrated sensor transmitter device for measuring and reporting a physical quantity of a given medium comprises a sensor for measuring a physical quantity of a medium and providing an electrical output as a function of the property measured,... | 05/29/2007 |
| 7212562 | System and method for controlling total electrical power across multiple furnaces using electrode positioning A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. A central controller monitors variable reactances in the loads and identifies situations of power and/or current fluctuation and/or unbalance. The central contr... | 05/01/2007 |
| 7212561 | System and method for controlling electrical power across multiple furnaces using variable reactors A method and system for stabilizing energy consumption in multiple loads, or in single multi-phase loads. The method and system also compensates for unbalance in multi-phase loads. A central controller monitors variable reactances in the loads and identifies situati... | 05/01/2007 |
| 7187566 | Three-phase rectifier A capacitor-input type three-phase rectification circuit comprises a three-phase AC power supply (1), a diode rectifier circuit (4), and a low-frequency filter connected between the three-phase AC power supply (1) and the diode rectification cir... | 03/06/2007 |
| 6912354 | Concentric electrode DC arc systems and their use in processing waste materials An electrode assembly comprising concentric tubular electrodes is provided for high temperature processing of materials. The electrode assembly is connected with a power supply that includes switching means for alternatively operating the electrode assembly in a tra... | 06/28/2005 |
| 6693947 | Method to protect the anode bottoms in batch DC electric arc furnace steel production A batch process for an electric arc furnace (1) to manufacture steel (10) includes the steps of providing an empty furnace having a bottom (14) and sides (16) and electrodes (2, 3); adding molten metal to the empty furnace; adding other necessary ingredie... | 02/17/2004 |
| 6490312 | Direct-current arc furnace comprising a centric charging shaft for producing steel and a method therefor A direct-current arc furnace for producing steel has a smelting vessel with electrodes, tapping openings for the molten mass and slag, and a device for a direct removal of exhaust gases. The smelting vessel is extended upwardly by a central shaft for intr... | 12/03/2002 |
| 6466605 | Concentric electrode DC arc system and their use in processing waste materials An electrode assembly comprising concentric tubular electrodes is provided for high temperature processing of materials. The electrode assembly is connected with a power supply that includes switching means for alternatively operating the electrode assemb... | 10/15/2002 |
| 6421366 | Method and device for supplying an electric arc melting furnace with current The invention pertains to a process and to a device for supplying current to an electric-arc melting unit for melting and heating metal, especially steel, with a three-phase a.c. source, which sends the current via devices for producing direct current or ... | 07/16/2002 |
| 6192065 | Method and apparatus for controlling arcing in a DC arc furnace In the operation of a dc arc furnace components of the furnace are monitored to detect unwanted arcs. A first low impedance path is continuously established between the components. When an arc is detected a second conductive path of a predetermined impeda... | 02/20/2001 |
| 6034985 | Remelting method for recognition and recovery of noble metals and rare earths Method for recognition of noble metals otherwise not recognizable in base material clusters includes using an electric arc furnace in which base material clusters are disintegrated to free atoms or are alloyed with other components of the base materials, ... | 03/07/2000 |
| 6026113 | Method for the electromagnetic stirring of the liquid metal in electric arc furnaces and relative device Method for the electromagnetic stirring of the liquid metal (14) in direct current electric arc furnaces which include a hearth (35) defined by a floor (13) and by side walls (15), a central cathode (11) cooperating with anodes (12) arranged on the floor ... | 02/15/2000 |
| 5991327 | Smart predictive line controller for AC and DC electric arc furnaces In an electric arc furnace having a power source for applying at least one AC/DC voltage to at least one electrode, and the electrode being spaced apart from a grounded container for receiving scrap metal, wherein the application of the at least one AC/DC... | 11/23/1999 |
| 5956366 | Arc furnace and method in which molten material is stirred and the arc is guided A direct current electric arc furnace for melting or heating raw material or molten material. The furnace includes a refractory lined vessel for holding raw or molten material in its interior. The furnace includes at least a first top electrode. The first... | 09/21/1999 |
| 5900209 | Plant for producing metal melts A plant for producing metal includes a electricity supply system and a direct-current electric arc furnace connected thereto, where in order to make do with an electricity supply system possessing a relatively small short-circuit capacity, the direct-curr... | 05/04/1999 |
| 5889809 | Cooling system for electrodes in D.C. electric arc furnaces Cooling system for electrodes (11) in D.C. electric arc furnaces, the electrodes (11) comprising a part (11a) subjected to the hot environment of the furnace, this part being made of graphite in the case of a cathode and of copper in the case of an anode,... | 03/30/1999 |
| 5867523 | Electric furnace with conductive hearth An improved return path for electric current through a conductive hearth of a direct current arc furnace is provided by pressing a ring of water cooled copper blocks into the periphery of a sidewall of the hearth of the furnace, the hearth having zones of... | 02/02/1999 |
| 5844933 | Electrode arrangement for direct current and furnace A d.c. arc furnace for metallurgical purposes includes two or more electrodes arranged on the furnace vessel and projecting into the furnace vessel. To avoid actions of forces departing from the magnetic fields derived form the currents conducted to the e... | 12/01/1998 |
| 5809054 | Method for stabilizing an AC system against reactive-load fluctuations, and a power-factor correction device In operation, DC arc furnaces generate undesired reactive load fluctuations which are compensated for by a power controller without special compensation reactance. In order to permit a melting operation of the arc furnace in weak AC systems the DC furnace... | 09/15/1998 |
| 5809055 | Metallurgical vessel heated by direct current and having a bottom electrode A metallurgical vessel heated by direct current, particularly for the production of ferroalloys, including a metallic jacket lined with refractory material and a bottom electrode. A bottom electrode (22) is located within the interior of the vessel and ar... | 09/15/1998 |
| 5787109 | Furnace vessel for a DC arc furnace The furnace vessel for a DC arc furnace has a thermostable wall which preferably consists, in the region situated above the slag line (S), of a plurality of water-cooled wall segments (1) made from steel. These wall segments are fastened to a support stru... | 07/28/1998 |
| 5748666 | Method and furnace for treatment of ash A method and a d.c. arc furnace for thermal treatment of an ash, wherein reducing conditions are established within a closed and sealed furnace, the ash is supplied via a channel arranged in an electrode which extends towards a metal melt in a furnace she... | 05/05/1998 |
| 5737355 | Directly induced swing for closed loop control of electroslag remelting furnace An apparatus and method for controlling an electroslag remelting furnace, imposing a periodic fluctuation on electrode drive speed and thereby generating a predictable voltage swing signal. The fluctuation is preferably done by imposition of a sine, squar... | 04/07/1998 |
| 5708677 | Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting The electrode gap of a VAR is monitored by determining the skewness of a distribution of gap voltage measurements. A decrease in skewness indicates an increase in gap and may be used to control the gap.... | 01/13/1998 |
| 5694413 | Procedure and apparatus for continuous supply of heat in electrically conductive bulk goods The invention relates to a procedure for continuous supply of heat into electrically conductive bulk goods by exploiting the electrical resistance thereof in an oven chamber with an inlet opening and a drawing-off apparatus for continuous throughput of bu... | 12/02/1997 |
| 5651024 | Cooled bottom electrode for a direct current electric furnace A cooled bottom electrode for a direct-current electric furnace includes one or more steel bars incorporated in a refractory hearth of the furnace and having at least its upper end in contact with the bath of molten metal within the furnace, at least a fi... | 07/22/1997 |
| 5629879 | Control device for the actuation of switchgears according to a time program The information on the state of switchgears (2.1;2.2) appearing on call circuits in the form of analog low-voltage signals is conveyed in parallel to a circuit block (4). The information is digitalized at given points in time in the form of binary values ... | 05/13/1997 |
| 5617447 | Method of stabilizing a power supply network against reactive load fluctuations, and a reactive power compensation device When operating, DC arc furnaces generate undesired reactive load fluctuations which are compensated without special compensation reactance by a reactive power controller. As compensation reactance, use is made of inductors, which are always present and vi... | 04/01/1997 |
| 5610937 | Regulation method for a DC arc furnace In operation, DC arc furnaces produce reactive load fluctuations which lead to undesirable flickering phenomena especially in a frequency range from 2 Hz-20 Hz. In order to reduce these flickering phenomena, comparatively fast reactive power regulation is... | 03/11/1997 |
| 5590151 | Process for melting scrap iron in an electric furnace and installation for implementing the process A direct current electric furnace for melting ferrous raw material, such a scrap iron, comprising a vessel (1) closed by a detachable cover (13), at least one consumable electrode (5) which passes through at least one opening (16) in the cover (13), at le... | 12/31/1996 |
| 5590152 | DC arc furnace Two upper electrodes 16 and 17 are horizontally spaced apart from each other with a predetermined distance and vertically extend through a furnace roof 3 of a furnace shell 2. Upper conductors 20 and 21 are connected to the upper electrodes 16 and 17 and ... | 12/31/1996 |
| 5588018 | Metallurgical container comprising a hearth bottom electrode A metallurgical container of the type having a vessel having a bottom wall and an inner refractory lining includes a hearth bottom electrode extending through the bottom wall and the lining and including, in a superposed condition, a bar and a connector. ... | 12/24/1996 |
| 5583883 | Electric arc-furnace stabilization using voltage pulse injection An arc furnace (1) has an electrode (13) and connection members (14) for connection to a power-supply network (20) for supplying an arc (16) at the electrode with current. The furnace is provided with a voltage-pulse generating member (3) adapted, in conn... | 12/10/1996 |
| 5533044 | Method of electrode regulation of a DC arc furnace and electrode regulation device DC arc furnaces have a current regulator for maintaining the current of an arc constant and an electrode regulator for affecting the position of an electrode of the arc furnace and thus the length of the are. Adjustment of the position of the electrode ta... | 07/02/1996 |
| 5526374 | Direct current electric arc furnace A direct current electric arc furnace for melting metal, which furnace includes a furnace vessel having a lower vessel part lined with a refractory material and a metal upper vessel part through which a cooling agent can flow. A cover is adapted and arran... | 06/11/1996 |
| 5490163 | Method of operation of a D.C. electric-arc furnace with bottom electrode and refractory part for its implementation The method relates to the operation of a D.C. electric-arc furnace provided with at least one bottom electrode including an elongated metal current-supply body passing through the hearth of the furnace and surrounded by a casing made of dense refractory s... | 02/06/1996 |
| 5479435 | DC arc furnace Provided are a furnace shell with a lower electrode at a bottom of the shell, a furnace roof adapted to close an upper portion of the furnace shell, a material charge port substantially at a center of the furnace roof and two upper electrodes positioned l... | 12/26/1995 |
