Abstract: A filling stand arrangement for a metallurgical ladle with a ladle mouth, has at least one delivery device for molten metal and a hood covering the mouth of the metallurgical ladle, which hood has at least one recess for pouring in the molten metal. An exhaust conduit means, to which the hood is connected, is provided along with a flue dome located above the at least one delivery device. The flue dome is also connected to the exhaust conduit means and covers the delivery device and the at least one recess of the hood.

Abstract: A method for recovering unburnt exhaust gases in an oxygen converter, is described, which involves the control of an exhaust gas damper by means of a control signal obtained by signal-processing, in accordance with set functional formulae, an exhaust gas damper control signal obtained from the pressure differential between the converter throat pressure and atmospheric pressure, and an exhaust gas damper prediction control signal obtained by continuously detecting the quantities of oxygen fed and of secondary raw material charged, as well as the composition of the exhaust gases and the flow rate of exhaust gases. With this signal processing the quantity of furnace generated gases and the quantity of combustion exhaust gases at the converter throat are calculated and the degree of optimum aperture of the converter damper is controlled.

Abstract: A method for treating waste gases which are emitted from metallurgic refining methods wherein the gas is collected, cooled, cleaned and stored, and wherein the gas is removed from the refining method and treated under an excess pressure which pressure results from the refinery gas pressure. An apparatus for carrying out the method comprising a metallurgic vessel contained in a pressure vessel which is connected to a waste gas cooler and a dust separator is disclosed.

Abstract: The exhaust hood above a metallurgical furnace, where the furnace has an open top and is supported to move in a vertical arc beneath the hood from an upright position to tilt in one direction to a charging position and in the other direction to a tapping position, terminates in an opening which is usually circular and of a diameter such that it may receive gases and dust from the open top of the furnace when the furnace is tilted to one side or the other, as well as when it is vertical. A frame structure supported above the opening in the hood and arranged to be shifted horizontally relative to the hood has a panel suspended therefrom with operating means on the frame for swinging the panel in a vertical arc from a storage position where it is removed from the space between the top of the furnace and the hood downwardly to a level below the open end of the hood and then upwardly against the bottom of the hood to close the greater portion of the bottom of the hood and leave but a segment of the bottom open.

Abstract: An open-topped vessel for converting molten ferrous metal to steel is pivotal about a horizontal axis and has bottom tuyeres for blowing oxygen or other gases upwardly through molten metal. An enclosure at least partially surrounds the vessel and cooperates with a smoke hood to prevent the escape of pollutants when the vessel is in its vertical position. A pair of access doors are provided for closing an opening provided in the enclosure laterally of the vessel tilt axis and are mounted for movement in opposite directions. An auxiliary smoke hood is mounted in the enclosure above the opening for capturing pollutants when the vessel is tilted toward said opening for being charged. The inner surface of the doors are formed of a plurality of tubular members which extend generally vertically and are connected to inlet and outlet headers at their opposite ends. The doors may be provided with a removable section in the region most directly impacted by materials discharging from the vessel when the vessel is tilted.

Abstract: A fume extraction assembly comprises an elevated canopy adapted to collect fume; and elongated outlet means offset from an apex of the canopy and having gas flow characteristics compensating for a tendency to uncontrolled extraction rates along said outlet means.

Abstract: The dust removal plant is comprised of a fan with adjustable guide vanes and a ring gap scrubber with adjustable gap width. A first feedback loop controls the scrubber operation through gap width control for maintaining a constant residual dust content of the gas as discharged, a second feedback loop keeps the pressure constant at the scrubber intake by adjusting the guide vanes. Both feedback loops reduce the power consumption of the fan for periods of low dust development. The apparatus is explained with reference to cleaning of smoke gas discharged from a blowing steel converter.

Abstract: A hood arranged at a blowing stand of a steel making plant for diverting the smoke and flue gases emerging during charging of a converter, totally covers the converter mouth at a vertical distance thereabove so as to leave room for the charging container, and includes closeable recesses, into and out of which the carrying devices of a crane guiding the charging container can be moved.

Abstract: A hood for diverting the flue gases and smoke when pouring molten metal from a tiltable metallurgical vessel into a ladle hanging from a crane, has an opening through which the vessel lip projects into the hood interior, at least one recess through which the ladle carrying means can be moved, and a structure that covers the ladle mouth and the carrying means on all sides.

Abstract: In an installation for the collection of gases emitted by a tiltable converter which includes an enclosure for the converter connected to a suction duct, a damper for controlling the draught in the suction duct is provided, the damper being controlled in dependence on the difference in pressures inside and outside the enclosure and the orientation of the axis of the converter so that the pressure differential is maintained at one level when the converter is vertical and at another level when the converter is non-vertical.

Abstract: A hood suitable for a steel processing vessel particularly one utilizing argon-oxygen decarburization where the hood has a fixed part and a movable part, the movable part facilitating replacement of the vessel, the movable part also having a draft damper providing for different exhaust air flow for different operating conditions.

Abstract: Contaminated exhaust gases being generated at a work table or work station having one or more open sides adjacent the area above the work table, and normally tending to rise into the atmosphere surrounding the work station, are collected in an exhaust hood which includes an inlet extending parallel to and generally above each of the open sides. A first portion of such exhaust gases collected are passed on to be filtered in conventional pollution abatement equipment; however, a second portion of the contaminated exhaust gases are rerouted, in some cases mixed with fresh outside air, and introduced through an air nozzle directed at the aforementioned inlet to the exhaust hood to improve the exhaust gas collecting, as well as reducing the requisite capacity of the filtration equipment and reducing the intake of make up air from the room surrounding the work table.

Abstract: A converter for refining a liquid metal bath using simultaneous heating and blowing in comprises a metal vessel internally lined with refractory material, having an upwardly open mouth and having a generally cylindrofrustoconical shape which is a body of revolution about an axis, the vessel being mounted on, and rotatable about, its axis of revolution relative to a pivotable cradle, the vessel having a pouring spout and a set of tuyeres extending through a wall thereof, and a separate frustoconical cap connected to a gas collection hood for surmounting the vessel and provided with an opening through which a heating device can extend into the vessel, the arrangement being such that in the `normal` position of the vessel, for simultaneous blowing in and heating, the axis of revolution of the vessel is at an angle between 35.degree. and 55.degree. to the vertical, the pouring spout is upwardly directed, the tuyeres extend upwardly from the bottom of the vessel and the vessel is surmounted by the cap.

Abstract: A pair of metallurgical vessels are each coupled by a gas collecting hood having a movable skirt to a gas cleaning system which includes an exhaust fan and a quencher and scrubber each having flow varying means. Each vessel is surrounded by an enclosure having an access door toward which the open upper end of the vessel may be tilted for receiving a metal charge. A secondary gas collecting hood is disposed in each enclosure above the access door for creating an indraft when the door is open. A valve system permits the selective connection of the secondary hood of one enclosure to the fan of the other to increase the indraft during furnace charging, sampling and pouring.

Abstract: Apparatus for collecting and removing smoke and fumes from a melting furnace plant comprising a platform tiltably supported by stationary supporting members, the tilting axis being near one edge of the platform, a furnace fixedly mounted to the platform, said furnace having a furnace chamber open at the top and accessible through a charging orifice in the platform, said furnace having a pouring spout connected to the upper part of a side wall of the furnace and located near the tilting axis. A hood is pivotally supported by supporting members mounted to the platform and being angularly movable towards and away from a portion of the platform surrounding the charging orifice of the platform. The pivot axis of the hood is parallel with the tilting axis of the platform and extends at the same side of the furnace as the tilting axis. A pair of parallel wall members are arranged on the upper surface of said platform and extend at right angles to the tilting axis.

Abstract: A device for removing smoke gases, dust and the like from a workpiece to be flamed includes a suction hood mounted on a movable flaming machine located before the flame burner as seen in the flame direction and is characterized by the hood being connected by a first duct to a trough to which a second duct communicates with a filter apparatus being at the free end of the second duct.

Abstract: Two elongated sealing members are provided to prevent escape of gases from between a movable wall member and an abutting wall member of a metallurgical vessel enclosure. A first elongated sealing member is mounted on the first of the wall members and has a compressible material facing the second of the wall members. A second elongated sealing member is mounted on the second of the wall members and has a blade facing the elongated receiving member. The elongated sealing members are located so that they make contact before the adjoining edges of the wall members are abutted. At least one of said elongated sealing members is movably mounted so that after the elongated sealing members make contact, the wall members may be moved to an abutting position with their adjoining edges touching so as to minimize the effect of heat on said elongated sealing members.

Abstract: Contaminated exhaust gases being generated at a work table or work station having one or more open sides adjacent the area above the work table, and normally tending to rise into the atmosphere surrounding the work station, are collected in an exhaust hood which includes an inlet extending parallel to and generally above each of the open sides. A first portion of such exhaust gases collected are passed on to be filtered in conventional pollution abatement equipment; however, a second portion of the contaminated exhaust gases are rerouted and introduced through an air nozzle directed at the aforementioned inlet to the exhaust hood to improve the exhaust gas collecting, as well as reducing the requisite capacity of the filtration equipment and reducing the intake of make up air from the room surrounding the work table.

Abstract: A converter for the refinement of liquid metal comprising a generally cylindrical body having closed ends and an opening in the circumference thereof, the body being arranged with its axis horizontal and being rotatable thereabout, a refractory arch with a heating unit movable into one part of the opening in the "normal" position of the body in which the opening is in an upper part thereof, a gas collection system aligned with the other part of the opening in the "normal" position of the body, and blast pipes extending into the body through a lower part of the body in the "normal" position thereof.

Abstract: This disclosure proposes an improved method of and apparatus for collecting the fumes of a furnace but in particular of a steelmaking furnace using the basic oxygen blowing process which furnace rotates about a trunnion arrangement. Especially this disclosure applies to an improved fume collecting method for an oxygen steelmaking furnace whose emissions take place during the charging of scrap, during the charging of molten iron, during blowing oxygen in the furnace, and during the sample and temperature taking. This fume collection is accomplished by providing a hood of multiple purpose design adapted to collect the emissions during any of the aforementioned portions of the steelmaking cycle, which can be retro-fitted to existing steelmaking facilities.

Abstract: This disclosure proposes an improved method of and apparatus for collecting the fumes of a furnace but in particular of a steelmaking furnace using the basic oxygen blowing process which furnace rotates about a trunnion arrangement. Especially this disclosure applies to an improved fume collecting method for an oxygen steelmaking furnace whose emissions take place during the charging of scrap, during the charging of molten iron, during blowing oxygen in the furnace, and during the sample and temperature taking. This fume collection is accomplished by providing a hood of multiple purpose design adapted to collect the emissions during any of the aforementioned portions of the steelmaking cycle, which can be retro-fitted to existing steelmaking facilities.

Abstract: An open-topped vessel for converting molten ferrous metal to steel is pivotal about a horizontal axis and has bottom tuyeres for blowing oxygen or other gases upwardly through molten metal. An enclosure at least partially surrounds the vessel and cooperates with a smoke hood to prevent the escape of pollutants when the vessel is in its vertical position. A pair of access doors are provided for closing an opening provided in the enclosure laterally of the vessel tilt axis. The doors are mounted for movement in opposite directions on roller support means external of the enclosure and an auxiliary smoke hood is mounted in the enclosure above the opening for capturing pollutants when the vessel is tilted toward said opening for being charged.

Abstract: An open-topped vessel for converting molten ferrous metal to steel is pivotal about a horizontal axis and has bottom tuyeres for blowing oxygen or other gases upwardly through molten metal. An enclosure at least partially surrounds the vessel and cooperates with a smoke hood to prevent the escape of pollutants when the vessel is in its vertical position. A pair of access doors are provided for closing an opening provided in the enclosure laterally of the vessel tilt axis and are mounted for movement in opposite directions. An auxiliary smoke hood is mounted in the enclosure above the opening for capturing pollutants when the vessel is tilted toward said opening for being charged. The inner surface of the doors are formed of a plurality of self-mounted cast iron plates.

Abstract: A hood for capturing fumes and dust generated during operating of a metal melting furnace including an integral conveyor for charging the furnace. The furnace has an upwardly opening mouth covered by a lid. The hood overlies the lid to capture fumes and dust emanating from the furnace during melting, slagging, pouring, and associated furnace operations. An opening is provided in the hood for insertion of material, e.g., scrap metal, into the furnace. The instant invention includes a conveyor flexibly, e.g., pivotally, mounted between the hood and the lid. The hood opening includes a hopper mounted above the conveyor and opening through the hood into the conveyor. The illustrated system further includes an opening through the furnace lid and a chute adjacent the furnace lid opening for engaging a distal end of the conveyor when the conveyor is moved into a use position. A door is provided to close the distal end of the conveyor when the conveyor is not moving material into the furnace.

Abstract: Apparatus for collection of tapping gases to prevent worker exposure to them is disclosed.The apparatus comprises a plurality of screens in combination with an opening in the floor positioned so that tapping gases are removed by the smoke hood without the need for separate tapping gas removal apparatus.

Abstract: A pair of metallurgical vessels are each coupled by a gas collecting hood having a movable skirt to a gas cleaning system which includes an exhaust fan and a quencher and scrubber each having flow varying means. Each vessel is surrounded by an enclosure having an access door toward which the open upper end of the vessel may be tilted for receiving a metal charge. A secondary gas collecting hood is disposed in each enclosure above the access door for creating an indraft when the door is open. A valve system permits the selective connection of the secondary hood of one enclosure to the fan of the other to increase the indraft during furnace charging, sampling and pouring.

Abstract: A seal is provided to prevent gas flow through the opening in the converter enclosure that accommodates the converted hood and the annular skirt that is telescopically movable thereon. The seal comprises a fixed ring on the enclosure and a movable ring attached to the skirt. The latter contains a liquid body for sealing purposes. The configuration of the rings is such that they cooperate to define a labyrinth to prevent kish accumulation in the liquid seal. Pressurized air can be supplied to augment the liquid seal.

Abstract: An open-topped vessel for converting molten ferrous metal to steel is pivotal about a horizontal axis and has bottom tuyeres for blowing oxygen or other gases upwardly through molten metal. An enclosure at least partially surrounds the vessel and has a top opening to permit a primary smoke hood to prevent the escape of pollutants when the vessel is in its vertical position. An auxiliary hood is disposed above an access door and is provided in the enclosure laterally of the vessel tilt axis. An elevatable auxiliary smoke hood is disposed in surrounding relation to the smoke hood for sealing the top opening.

Abstract: The improvement in method and apparatus for basic oxygen steel making employing the off-gas principle for pre-heating purposes. This improvement involves the directing of the off-gas from a first furnace during refining to a second furnace, and burning said off-gas within the second furnace efficiently in order to preheat scrap and/or iron pellets in order to decrease the charge of molten pig iron and increase the solid charge. At the conclusion of the refining portion of the cycle, said first furnace is emptied of its steel and the cold charge is introduced into it while molten pig iron is charged into said second furnace on top of the pre-heated scrap. The cycle is then reversed by refining in said second furnace and directing said off-gas to said first furnace where it is mixed with oxygen or air and burnt within it to provide energy for the pre-heat. The method and apparatus provide for the protection of the lining and gives consideration to maintenance and pollution control.

Abstract: An improved apparatus for cooling hot pellets discharged from a kiln or the like with water is presented wherein the pellets are charged through a chute into a water cooling bath while avoiding oxidation thereof. The cooling bath is covered with a hood and the pressure difference between the chute and hood is controlled during the process.

Abstract: A method of avoiding emission of carbon monoxide from the exhaust gases of oxygen converters comprises collecting the gases of the converter in a cooling stack and directing the gases from the cooling stack through a dust collector to a clean gas stack in which they are permitted to flow out through the top and preferably through a burning device for burning them off. To insure that the gases remain burnable an additional fuel gas is fed into the clean gas stack for combining with the other gases and in quantities which are proportional to the content of carbon monoxide and oxygen in the gases which are circulated. An apparatus for carrying out the method includes a connection between a cooling gas stack in which the gases are collected from the converter to a clean gas stack which includes a dust collector and a blower for circulating the gases.

Abstract: Contaminated exhaust gases being generated at a work table or work station having one or more open sides adjacent the area above the work table, and normally tending to rise into the atmosphere surrounding the work station, are collected in an exhaust hood which includes an inlet extending parallel to and generally above each of the open sides. A first portion of such exhaust gases collected are passed on to be filtered in conventional pollution abatement equipment; however, a second portion of the contaminated exhaust gases are rerouted and introduced through an air nozzle directed at the aforementioned inlet to the exhaust hood to improve the exhaust gas collecting, as well as reducing the requisite capacity of the filtration equipment and reducing the intake of make up air from the room surrounding the work table.

Abstract: A textile or other industrial machine, of the type where one or a plurality of operations generate a gaseous discharge at a work station, is provided with at least one wall leaving at least one open side and includes an exhaust hood on the top which communicates with the air space above the work station. A first fan communicates with the exhaust hood to withdraw smoke, fumes, vapors and steam from the air space and deliver it to the outside. A second fan draws in fresh, unconditioned outside air and delivers it to a delivery nozzle extending along the front edge of a work table in said work station. An air curtain is thus formed between the delivery nozzle and the aforementioned exhaust hood, whereby the smoke, fumes, vapors and steam are confined within the air space above the work table until withdrawn through the exhaust hood.

Abstract: The mouth of a metal refining vessel has a primary gas collection hood supported over it. A duct couples the hood to a gas cleaning quencher which is serially connected by a duct to a wet scrubber. A fan draws gases and suspended particulates through the system and discharges the effluent from the scrubber to a stack which burns the gas in the atmosphere. A secondary gas collection hood is supported over the first hood. The secondary hood has a duct which connects into the gas cleaning system intermediate the quencher and the scrubber. A bell damper connects the duct from the secondary hood into the intermediate duct. When the vessel is tilted away from the primary hood, the damper is opened so that gases escaping from the mouth of the vessel may be captured by the secondary hood and passed through the gas cleaning system. The secondary hood has a chain curtain which yields to allow a ladle or scrap charging box to swing over the vessel mouth when it is tilted.

Abstract: An open topped vessel for converting molten ferrous metal to steel is pivotal about a horizontal axis and has bottom tuyeres for blowing oxygen or other gases upwardly through molten metal contained therein. An enclosure at least partially surrounds the vessel and cooperates with a smoke hood to prevent the escape of pollutants when the vessel is in a generally vertical gas blowing position. The vessel is pivotable about a horizontal axis to position its open top adjacent an access door in the enclosure whereby the vessel may be charged with hot metal from a ladle or with scrap from a charging chute. A pair of bumpers are positioned adjacent the access door support beams to prevent damage thereto by the charging apparatus.

Abstract: A method and apparatus for the recovery of gases issuing from a metallurgical refining furnace or converter, in which said gases are drawn off through a hood disposed above the outlet of the furnace and are entered as a gas column into a combustion chamber from which the burnt gases are drawn off by a main blower while air is simultaneously drawn from a space around the furnace adjacent to the inlet of said hood by means of an auxiliary blower and is forced into said combustion chamber to burn combustible components of said gases therewithin, the invention further including withdrawing a fraction of said combustible gases by sucking them from said gas column within the combustion chamber substantially before they are mixed with burnt combustion products generated within said combustion chamber to send said withdrawn fraction to utilization means which are external to said combustion chamber, and the invention further including the control of the rates of flow of the gases through various conduits in the syste

Abstract: A lance port seal for BOF vessel gas collecting hoods includes a pair of seal portions each having registrable semi-circular openings for receiving an oxygen lance therethrough. A support assembly mounts the seal members above the lance port for limited two-dimensional movement in a plane generally normal to the axis of the lance. The seal portions are also pivotally mounted on the support assembly for movement toward and away from the other member for permitting insertion and removal of the lance and for re-establishing the seal after the lance is in position.

Abstract: In a device for the collecting and conveying of fumes emanating from a furnace having an opening therein, the device includes a fume hood disposed in communication with the furnace opening with a fume collecting reservoir extending around the fume hood, the fume collecting reservoir and the fume hood being in further fluid communication with an exhaust system, the exhaust system including means therein to selectively control the flow of fumes from the fume collecting reservoir and the fume hood.

Abstract: An exhaust duct for use with a direct evacuation exhaust decontamination system of a blast furnace or steel converter. The exhaust duct includes a main support coolant inlet conduit and a plurality of coolant return conduits arranged in a generally circular pattern to define an exhaust duct having a circular cross section for the evacuation of exhaust gases from a furnace. The inlet conduit and the return cooling conduits are connected to a distribution manifold on one end so that all of the coolant enters the exhaust duct through the main coolant supply conduit and is returned and discharged through the smaller cooling conduits which thereby serve to maintain the exhaust duct at a relatively low temperature to prevent oxidation or destruction of the duct walls by the exhaust gases. The discharged coolant may be directed into the exhaust gases at the end of the exhaust duct for use in a "wet" exhaust cleansing system or collected in a trough or manifold when used with a "dry" exhaust cleansing system.

Abstract: A converter with a converter hood provided with a plurality of cooling channels, wherein always one single reflux tube is allocated to a plurality of cooling channels and connects them with an upper collector conduit section and the lower distributor conduit section following thereupon; the cooling channels have smaller cross-sections than the reflux tube allocated thereto, and thus the converter hood is provided with an uneven surface.

Abstract: A water cooled, off-gas collecting hood is adapted to be disposed above the open end of a metallurgical vessel into which oxygen and a hydrocarbon shielding fluid are blown through submerged tuyeres. The hood includes an elbow section at its upper end for being coupled to an obliquely downwardly extending conduit communicating with the inlet of a gas cleaning system. A water cooled flow divider is disposed across the elbow and between the upper end of the vessel and the top of the elbow for dividing into upper and lower flow paths the gases discharging from the vessel and which are redirected in the elbow laterally to the conduit.

Abstract: This disclosure teaches a vertically adjustable water cooled dome ring between an upper rim of a crucible and its gas trap. The gas trap has a dome with a dome opening which substantially conforms in cross section to a mouth defined by the upper rim of the crucible. The upper rim is provided with a downwardly and inwardly inclined lip. The dome ring has a seating collar adapted to engage the upper rim in a substantially gas tight manner. The seating collar is adapted to engage the upper rim about the mouth outward and in proximity of the inclined lip. Manifolds for cooling water are kept out of contact with the upper rim. A labyrinth passage is provided for entry of air between the dome and the seating collar.