Abstract:
A waste heat recovery system in which hot waste fluids, such as flue gasses, pass through a fluid heat exchanger configured to transfer energy in the form of heat to a heat transfer liquid, preferably molten salt. The energy in the molten salt is used to generate useable power such as electrical energy. The waste gas heat recovery system is especially adapted for use with batch processes, such as steelmaking and copper converting, and allows continuous or substantially continuous power production.
Abstract:
The invention relates to heat-and-power engineering, particularly, to the devices for solid fuel firing, processing of thermal and thermal condensing power plants ash wastes (AW) in a melted slag, bubbled by oxygenated gas, and getting refuse-to gas energy. The invention provides to increase maintainability of the furnace for fuel firing in melt (FFFM) by the development of a hearth and a hearth enclosure construction, mounting of a gas seal device along the power boiler girth at the power boiler-furnace conjunction and selection of the furnace optimal length. The FFFM hearth includes the mounting of padded caissons on the refractory masonry surface and embedded ones - into the hearth masonry at the depth of 10-12 gages of air tuyeres of embedded caissons. The mounting of the gas seal device along the power boiler girth provides to eliminate both the leak-in from atmosphere and the exhaust gases discharge.
Abstract:
An apparatus for the combustion of gas exiting from an electric arc furnace for the preheating of scraps entering the furnace itself foresees an insertion device of comburent substance into a preheating chamber or loading tunnel of the scrap metal having an inlet section of the scrap metal, a seal section to prevent an uncontrolled entrance of air in the tunnel, a heating section and an unloading section of the scrap metal in the furnace. Said insertion device of the comburent substance comprises one or more adjustable openings placed in the loading tunnel, and said apparatus comprises a device or a series of devices, also not equipped with autonomous movement, of mechanical seal nature placed in the insertion or inlet section of the scrap metal in the loading tunnel or preheating chamber.
Abstract:
An apparatus for the combustion of gas exiting from an electric arc furnace for the preheating of scraps entering the furnace itself foresees an insertion device of comburent substance into a preheating chamber or loading tunnel of the scrap metal having an inlet section of the scrap metal, a seal section to prevent an uncontrolled entrance of air in the tunnel, a heating section and an unloading section of the scrap metal in the furnace. Said insertion device of the comburent substance comprises one or more adjustable openings placed in the loading tunnel, and said apparatus comprises a device or a series of devices, also not equipped with autonomous movement, of mechanical seal nature placed in the insertion or inlet section of the scrap metal in the loading tunnel or preheating chamber.
Abstract:
A heat exchanger system (44) for iron making furnaces and their supporting exhaust and cooling systems including at least on panel (1-4) of sinuously winding piping (50) having an inlet (56) and outlet (58) with attached input (84) and output (86) manifolds, a cooling fluid flowing through the piping (50) and a stream of hot exhaust gases flowing over the piping (50).
Abstract:
The invention is a heat exchanger system suitable for iron making furnaces and their supporting exhaust and cooling system. The heat exchanger has at least one panel of sinuously winding piping having an inlet and an outlet, an input manifold in fluid communication with the inlet of the at least one panel, an output manifold in fluid communication with the outlet of the panel, a cooling fluid flowing through the piping, and a stream of hot exhaust gases flowing over the piping. In application, the heat exchanger system has at least one panel that is mounted to an interior side of a wall, and is in fluid communication with the output and the input manifolds that are on an exterior side of the wall. The wall typically is a wall of a steel making furnace, a furnace roof, a smoke ring exhaust port, a straight section of an exhaust duct, and a curved section of an exhaust duct. It is anticipated that the heat exchanger has other applications, such as cooling exhaust gases from converting plants, paper manufacturing plants, coal and gas fired electrical power generation plants, and other exhaust gas generators, where the gases are cooled for the purpose of capturing one or more components of the gas, where capture is effected by condensation, by carbon bed absorption, or by filtration. The heat exchanger system is preferably fabricated using an aluminum bronze alloy. Aluminum bronze alloys have been found to have a higher than expected thermal conductivity, resistance to etching by the stream of hot gases, and good resistance to oxidation. The operational life of the heat exchanger is extended. Corrosion and erosion of the heat exchanger and related components is reduced, when they are fabricated with aluminum bronze alloy.
Abstract:
Die Erfindung betrifft ein Verfahren zum Sammeln und Behandeln von Reaktionsgasen aus einer Erzeugungsanlage (1) für schmelzflüssige Metalle, wobei metallhaltige Einsatzstoffe in fester oder flüssiger Form in ein metallurgisches Gefäss eingebracht und unter Einwirkung von Brennstoffen und Reaktionsstoffen umgesetzt werden und die das metallurgische Gefäss verlassenden heissen, gasförmigen und staubbeladenen Reaktionsgase teilweise einem Primärentstaubungsprozess und teilweise einem Sekundärentstaubungsprozess in zugeordneten Staubabscheideeinrichtungen zugeführt werden. Um kurzfristig anfallende, grosse und heisse Reaktionsgasmengen mit möglichst klein dimensionierten Entstaubungsanlagen sicher entstauben zu können, wird vorgeschlagen, dass die dem Sekundärentstaubungsprozess zugeführten Reaktionsgase vor dem Entstaubungsprozess einen Wärmespeicher (9) durchströmen und von Reaktionsgasen mit einer Reaktionsgas-Temperatur, die über der Wandtemperatur der Speicherelemente liegt, Wärme an den Wärmespeicher abgegeben wird und diese gespeicherte Wärme an nachfolgende Reaktionsgase (oder angesaugte Umgebungsluft) mit einer Reaktionsgas-Temperatur, die unter der Wandtemperatur der Speicherelemente liegt, wieder abgegeben wird.
Abstract:
An existing steel making installation having a basic oxygen furnace facility is converted to an electric arc furnace facility for refining steel by modifying the furnace support pedestals to form spaced apart horizontal rail support pads and spaced apart rails are mounted on the pads and a superstructure extending horizontally at one side of the space formally occupied by the basic oxygen furnace. An electric arc furnace is mounted on a furnace transfer car for movement along newly installed horizontal rails between a furnace operating position and a furnace exchange position. The electric furnace having a tapping orifice for discharging treated steel and a slag discharge trough. Ladle transfer cars previously used for handling slag and steel from the basic oxygen furnace are reused for the same purpose during operation of the electric arc furnace. A fume opening in the electric furnace roof is connected by a vertical fume section and an elbow to the existing fume system. Bins used for supplying materials to the basic oxygen furnace are used to supply in some instances different materials to the electric arc furnace.
Abstract:
Apparatus for processing ferrous material including a vessel (20) for receiving the molten ferrous material (22) and a removable cover for the vessel, the cover comprising an outer cover (40) which has an upper port and an inner ring (42). The inner ring depends from the outer cover. The outer cover and the inner ring are moveable between a first position, separated from the molten ferrous material, and a second position when the inner ring extends into the material below the layer of slag (24) to block the flow path between the edge of the vessel and the upper port.
Abstract:
Aspiration system to reduce the losses of fine materials and powders from an electric arc furnace (11) having a lower hearth (12) suitable to contain the bath of metal material being melted (13), a substantially cylindrical chamber (14) arranged above the hearth (12), at least one electrode (15) arranged in a central zone of the chamber (14) and a roof (16) arranged to cover the chamber (14) and provided with at least one aperture (18) through which the fumes produced by the bath can exit, the system comprising a first aspiration sub-system (20) arranged inside the chamber (14) and at least another discharge sub-system (21, 22) arranged in correspondence with the roof (16), the first aspiration sub-system (20) comprising a coil of cooling pipes (24) arranged helical so as to define, in a vertical direction, empty zones (26) between the spirals of pipes, the coil of cooling pipes (24) being distanced from the cylindrical wall of the chamber (14) to define a peripheral interspace (25) through which the fumes can ascend towards the roof (16) according to at least an ascensional, rotatory vortex.