A direct current plasma arc furnace includes a tank having a crucible delimiting a chamber to receive material to be melted and/or treated; refractory walls surrounding the crucible outer surface; a metallic frame covering the refractory walls; and a heating system for heating the received material. The heating system includes two electrodes acting as cathode and anode, respectively, wherein the first electrode is a movable electrode to project vertically into the chamber. The crucible is part of an anode system also having the second electrode and at least one part connecting the crucible and second electrode. The crucible receives and holds material to be melted and/or treated and provides electric conduction for the flow of current to heat the material, such that the voltage potential difference between the cathode and any point of the crucible surface defined to be in contact with the material is the same.

An enclosure of a steel-making furnace system includes a support structure including a frame that defines an interior, a supply line for supplying a cooling liquid from a reservoir, and a return line fluidly coupled to the supply line and the reservoir. A plurality of panels includes sinuously winding piping having an inlet and an outlet. The inlet is fluidly coupled to the supply line and the outlet is fluidly coupled to the return line. The frame includes a plurality of support members spaced from one another, where each of the plurality of support members defines a slot. Each of the plurality of panels is removably and slidably received with the slot for coupling to the frame.

Disclosed herein is a metallurgical furnace and roof for the same. The roof has a body. The body has a top surface having a center. The top surface has a center opening disposed about the center. The body has a bottom surface opposite the top surface. An outer sidewall connects the top surface to the bottom surface. The outer sidewall, bottom surface and top surface define an interior portion, wherein the outer sidewall has a lift side and a hood side. An internal spray cooling system is disposed in the interior portion of the body. Lift brackets are disposed on the top surface. The lift brackets are configured to support the entire weight of the roof when suspended by a crane, wherein all the lift brackets are disposed in a first segment of the roof.

The present application provides a heat exchange assembly for exchanging heat between a coolant and a gaseous medium. The heat exchange assembly may include an outer jacket, a number of gas tubes positioned within the outer jacket, and a self-cleaning system positioned about the gas tubes. The self-cleaning system may include a number of chains extending through the gas tubes.

A lifting adaptor configured to lift a graphite electrode includes a main body having a threaded end to secure the lifting adaptor to threads of the graphite electrode, and a lifting component coupled to the main body opposite the threaded end to lift the graphite electrode. The threaded end of the main body may comprise a non-graphite material with a coefficient of thermal expansion (CTE) similar to Invar, within +/−0 to 1 (μm/(m K)) over a range from room temperature to 400 degrees Fahrenheit.

A system used in monitoring one or more operating parameters of a coolant-fluid cooled industrial installation includes one or more an acoustic sensors positioned to receive and sense one or more acoustic signals in an installation coolant-fluid flow. The acoustic sensor assembly operates to emit and sense acoustic signals at frequency ranges above and/or below the background noise frequency ranges which are associated with the normal industrial installation operation. Output data signals representative of sensed acoustic signals are compared to target frequency profiles predetermined as representing an acoustic frequency associated with a predetermined installation operating parameter or event.

The present invention belongs to the technical field of metallurgy, and discloses a horizontal continuous feeding preheating device and an enhanced preheating method therefor. The scheme comprises that two dust removal ports are arranged at the front and rear parts of a horizontal continuous feeding preheating duct, and the horizontal continuous feeding preheating duct is divided into an enhanced preheating area and a flue gas preheating area by the two dust removal ports arranged at the front and rear parts of the horizontal continuous feeding preheating duct; burners are installed in the enhanced preheating area, and the two dust removal ports are connected with a flue gas adjusting distributor respectively by a flue gas pipeline the steel scrap preheating efficiency of the burners and electric arc furnace flue gas is increased by controlling the flow rate and temperature of mixed flue gas.

A method of detecting an open arc in a DC plasma arc furnace which is based on detecting a linear decrease in the log of the magnitude of the frequency spectrum of the voltage between the anode and cathode.

A method for providing a region of inert gas around the electrodes in an electric arc furnace is provided. This electric arc furnace includes consumable graphite electrodes, a melting zone, and at least one lance including an inlet and an outlet, wherein the inlet is connected to a liquid inert fluid source. The method includes introducing the consumable graphite electrodes into the melting zone, wherein the distal ends of the electrodes form arcs with a solid charge of scrap metal. The method also includes introducing the liquid inert fluid into the inlet end of the at least one lance, wherein the inert fluid exits the outlet end and is introduced into the melting zone proximate to the distal ends of the electrodes, thereby providing an inert gaseous blanket, once the liquid vaporizes, around the distal ends of the electrodes

Magnetic field components are measured at multiple longitudinal positions and used to calculate estimated longitudinal position and length of a transversely localized electric current segment flowing across a gap between conductive bodies. The apparatus can be used with a remelting furnace. The electrode and ingot act as the conductive bodies, and arcs, discharges, or slag currents are the current segments spanning the gap. Actuators for movable sensors can be coupled to the sensors in a servomechanism arrangement to move the sensors along with the moving gap. An actuator for moving one of the conductive bodies can be coupled to sensors in a servomechanism arrangement to maintain the gap distance within a selected range as the gap moves.