EP0007418B1 - Vorrichtung zur Versorgung von Konverterdüsen mit gasförmigen und/oder flüssigen Kohlenwasserstoffen - Google Patents

Vorrichtung zur Versorgung von Konverterdüsen mit gasförmigen und/oder flüssigen Kohlenwasserstoffen Download PDF

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Publication number
EP0007418B1
EP0007418B1 EP79101915A EP79101915A EP0007418B1 EP 0007418 B1 EP0007418 B1 EP 0007418B1 EP 79101915 A EP79101915 A EP 79101915A EP 79101915 A EP79101915 A EP 79101915A EP 0007418 B1 EP0007418 B1 EP 0007418B1
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EP
European Patent Office
Prior art keywords
pressure
gaseous
converter
hydrocarbons
rotatable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79101915A
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German (de)
English (en)
French (fr)
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EP0007418A1 (de
Inventor
Hans-Georg Dr. Fassbinder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kloeckner CRA Patent GmbH
Original Assignee
Eisenwerke Gesellschaf Maximilianshuette mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eisenwerke Gesellschaf Maximilianshuette mbH filed Critical Eisenwerke Gesellschaf Maximilianshuette mbH
Priority to AT79101915T priority Critical patent/ATE80T1/de
Publication of EP0007418A1 publication Critical patent/EP0007418A1/de
Application granted granted Critical
Publication of EP0007418B1 publication Critical patent/EP0007418B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • the invention relates to a device for supplying converter nozzles from concentric tubes with gaseous and / or liquid hydrocarbons, oxygen or oxygen-containing gases being simultaneously passed through the nozzles into a converter.
  • German patent specification 2200413 describes the use of the same nozzles in a converter above the bath surface. Gaseous and / or liquid hydrocarbons are also used as the nozzle protection medium.
  • German Offenlegungsschrift 2756432 relates to a method for increasing the scrap rate in steel production in the OBM converter.
  • the usual oxygen injection nozzles are initially operated as oil-oxygen burners for preheating scrap.
  • gaseous hydrocarbons for example methane and propane
  • methane and propane are used as the nozzle protection medium.
  • the quantities of oil required for preheating the scrap which are of course higher than the quantities of the nozzle protection medium, can be passed through the same annular gap in the oxygen inlet nozzles as the gaseous hydrocarbons used to refresh the steel.
  • the gaseous hydrocarbons have proven to be problem-free in operational handling when used as protective media in steel production, while oil products are particularly suitable for preheating scrap.
  • German patent 21 61 000 describes a method and a device for the uniform allocation and alternate supply of liquid or gaseous protective media for fresh gas nozzles in a converter, but this method has not proven to be sufficiently reliable when used in a steel mill.
  • the reliable supply of hydrocarbons to the nozzles during operation without any interruption is a necessary prerequisite, because as soon as this condition is not met, the nozzles burn back and require lengthy repair work, which results in corresponding downtimes.
  • the economic disadvantages that result are considerable.
  • the multiple changeover valves and the control devices in the hot converter area proved to be prone to failure.
  • control valves with piston slide devices as described in the known method for switching from gaseous to liquid hydrocarbons, occasionally tend to pinch the piston slide in the guides.
  • a further device for the controlled supply of a fresh gas and a fluid protective medium does contain considerable improvements for the safety control of the nozzle protection medium, but the control valve, for example, shows a similar tendency to jam as the piston slide.
  • the object of the invention is therefore to provide a device which avoids the aforementioned disadvantages and which, in a simple, reliable manner, permits uniform allocation at widely differing flow rates and interchangeable supply of gaseous and / or liquid hydrocarbons to the nozzles and at the same time provides safety controls, which respond largely without inertia and already protect the rotating union from back gas flows.
  • the device according to the invention in which the hydrocarbon quantity control for gaseous and liquid hydrocarbons and the distribution on individual nozzle supply lines are combined in one assembly with the rotating union on the converter, and which is followed by a safety control element with several functions in the nozzle lines for gaseous hydrocarbons, has a series of advantages over the known devices for supplying the nozzles with hydrocarbons. Up to the rotatable control unit, the hydrocarbons are only led in a manifold.
  • a collecting line for the gas for example methane, propane, and for the liquid, for example oil
  • the manifolds have a sufficient cross-section for the maximum flow rate with widely differing flow rates. It is also within the scope of the invention to supply only one type of hydrocarbon to the nozzles. For example, when using natural gas, i.e. H. Methane, proven, to supply correspondingly large quantities for preheating scrap to the nozzles and to reduce the hydrocarbon throughput to the quantity required for nozzle protection of approx. 6 to 10%, based on the oxygen introduced, during the fresh process.
  • the quantity control device in the rotatable control unit allows this method of operation without any problems. Accordingly, when using liquid hydrocarbons, e.g. B. Oil. be moved.
  • the device according to the invention has particular advantages when alternating use of gaseous and liquid hydrocarbons.
  • the rotatable control unit has two separate control and distribution devices for this application.
  • the quantity control device for the hydrocarbons can be controlled as desired during the operating time. It works synchronously for all nozzles in the converter.
  • Another advantage of the device according to the invention is the relatively short, individual supply lines for liquid and / or gaseous hydrocarbons to each nozzle.
  • These individual nozzle supply lines can be designed for a minimal cross-section, so that at maximum throughput rates a maximum pressure drop for gaseous hydrocarbons of approximately 1.2 bar and for liquid hydrocarbons of approximately 2 bar is not exceeded. This results in relatively small volumes in the lines, and these small dead volumes have a favorable effect on the entire control system.
  • control unit responds almost without inertia, and when switching to hydrocarbon-free nozzle cooling media, for example nitrogen, air, argon, only short pieces of line need to be blown out during the converter idle times. H. the residual hydrocarbon quantities in the individual nozzle lines are small.
  • hydrocarbon-free nozzle cooling media for example nitrogen, air, argon
  • the rotatable control unit according to the invention is composed in principle of a stationary housing which is, for example, firmly connected to the bearing block of the converter, and a rotatable device part which is guided completely or at least partially centrally in the stationary housing.
  • the rotatable device part is mounted on the converter pivot and thus follows the converter rotation.
  • the rotatable part of the device essentially consists of the quantity regulating elements which are integrated with the distribution device for the individual nozzle feed lines for gaseous and / or liquid hydrocarbons.
  • the quantity is regulated in a manner known per se by changing the flow cross section before the hydrocarbons enter the individual nozzle feed lines.
  • the change in cross-section is brought about by a control piston which is sealed against the stationary housing by means of conventional seals and with intermediate vents.
  • the axial piston displacement results in a pressure-controlled diaphragm plate, which is moved by a conventional electropneumatic control unit, in the stationary housing. According to the invention, this diaphragm plate is in engagement with the control piston via an axial bearing.
  • An advantageous embodiment of the device according to the invention is to design the control piston mentioned so that it acts directly as a hydraulic piston.
  • the axial movements of the control piston are then caused by the pressure of a hydraulic fluid between the stationary housing part and the rotatable control piston.
  • the pressure of the hydraulic fluid required to produce the desired axial movements of the control piston is determined by a commercially available electropneumatic control device or hydraulic control unit set. This construction eliminates the need for the aforementioned axial bearing in connection with the diaphragm plate to transmit the diaphragm plate movement to the control piston.
  • the safety control elements in the individual supply lines for gaseous hydrocarbons are connected to the rotatable device part on the rotatable control unit. This only results in the need to transmit the required control pressure for the safety control elements from the stationary to the rotatable part of the control unit.
  • electrical signals for display and control purposes can be passed in an uncomplicated manner from the safety control elements via corresponding electrical sliding contacts on the rotatable control unit.
  • the rotatable control unit can have a passage arranged centrally in the axis of rotation.
  • This central passage is sealed gas-tight against all systems of the rotatable control unit.
  • the passage can be used, for example, as an additional supply line for the converter with any media or as a measuring line.
  • Said central passage can also accommodate several lines, for example in the form of concentric tubes that are also sealed against one another. So it has z. B. proven to perform three pressure measurement lines in the form of concentric tubes through the central bore of the rotatable control unit for control measurements at the bottom nozzles of a converter.
  • the safety control element in each nozzle line for the gaseous hydrocarbons represents an interrelated combination of pressure limiting and non-return valve with differential pressure switch. It essentially has three movable diaphragm plates, the position of which is determined by the pressures prevailing in five separate pressure chambers.
  • This safety control unit regulates the pressure of the gaseous hydrocarbons at the nozzles and the prevailing oxygen pressure at each nozzle and at the same time acts as a check valve as soon as oxygen is present. d. H. a higher pressure enters the nozzle ring gap.
  • it monitors the flow rate of gaseous hydrocarbons through the nozzles, which results from the pressure comparison of the gas before and after the flow regulator. As soon as this pressure difference falls below a minimum value, an electrical warning or control signal is triggered.
  • the pressure difference can also be transmitted and displayed as an analog value. This enables the nozzle supply with hydrocarbons and the function of the safety control elements to be monitored in a simple manner.
  • the rotatable control unit consists of the stationary housing 1, hatched in FIG. 1, and the rotatable device part 2, cross-hatched in FIG. 1.
  • the manifold 3 for the gaseous hydrocarbons is welded to the fixed housing 1. From the distribution space 4, the gaseous hydrocarbons flow through the holes 5 in the rotatable device part to the connecting lines 6 in the safety control element 7 and from there into the individual nozzle lines for gaseous hydrocarbons 8.
  • the safety control elements 7 in each nozzle line for gaseous hydrocarbons are fixed to the rotatable device part 2 connected and accordingly also follow the converter rotation.
  • the quantity regulating members at the inlet openings of the hydrocarbons from the distribution space 4 into the bores 5 consist of a conical bore 9 into which the regulating pins 10 are immersed.
  • the immersion depth of the regulating pins 10 in the conical bores 9 results in that which determines the gas quantities. free cross section for the gaseous hydrocarbons.
  • the regulating pins 10 are firmly connected to the control piston 11, which can carry out an axial movement.
  • the regulators thus take on both the function of a control valve for the total flow of protective media and the equal distribution of this flow across the individual nozzles.
  • the axial displacement of the control piston 11 is carried out by a pneumatic control known per se, which essentially consists of the diaphragm plate 12 and the control unit 13.
  • the diaphragm plate 12 is coupled to the control piston via the axial bearing 14.
  • the spring 15 presses the diaphragm plate 12 in the axial direction into the pressure chamber 16 until the regulating pins 10 close the conical bores 9.
  • the electropneumatic control unit 13 regulates the pressure in the pressure chamber 16 in such a way that the diaphragm plate 12 assumes the desired position, which is communicated to the control unit 13 by an electrical signal.
  • the control unit 13 monitors the desired position of the diaphragm plate 12.
  • the pressure chamber 1.6 is sealed by a diaphragm 18 against the unpressurized space 19, in which the spring is also located.
  • the other seals, for example 20, between the actuating cylinder and the diaphragm plate are conventional sealants.
  • two seals are advantageously combined with an unpressurized intermediate vent, for example seal 21, 22 and intermediate vent 23.
  • the liquid hydrocarbons are fed to the rotatable control unit via the manifold 24. They flow through the ring channel 25 in the rotatable part of the device and reach the distribution chamber 26 for liquid hydrocarbons. From there, they flow via the quantity regulating organs, consisting of the conical bores 27 and the regulating pins 28, into the individual nozzle lines 29.
  • the quantity regulation of the liquid hydrocarbons is carried out by the same pneumatic control unit 13 in connection with the membrane plate 12 and the control piston 11.
  • a line 8 for gaseous hydrocarbons and a line 29 for liquid hydrocarbons lead to each nozzle.
  • Each of these lines is assigned a quantity regulating element, consisting of a conical bore 9, 27 and regulating pin 10, 28.
  • the rotatable device part 2 is supported against the stationary housing 1 via the axial bearing 30.
  • the electrical display and control voltages are transmitted from the rotatable device part 2 to the stationary housing 1 by means of the sliding contact unit 31.
  • the sliding contact unit 31 is required for the transmission of the electrical signals from the individual safety control elements.
  • the control pressure for the line 32 on the safety control element is conducted via the supply line on the stationary housing 1 to the rotatable device part 2 and from there to the safety control element 7. Such a line path is partially shown.
  • the illustrated. rotatable control unit also has a central bore 42.
  • This line which is completely sealed against the other systems of the rotatable control unit by means of the seals 45 and 46 and the intermediate ventilation 47 another medium. or a control pressure can be fed to the converter, or this line can be used for pressure measurements on the converter.
  • 1 is a preferred embodiment of the device according to the invention for the supply of gaseous and liquid hydrocarbons to the converter nozzles. It can also be used for two different gaseous or liquid hydrocarbons.
  • the cross sections for the quantity regulation are of course to be adapted to the flow rates.
  • the rotating control unit can also be used for a variety of hydrocarbons, for example liquids or gases. It has proven useful to use a correspondingly simplified version of the rotatable control unit for supplying a converter with a type of hydrocarbon. Then only one set of flow regulators and only one individual line for each nozzle is required.
  • the safety control element 7 shown in FIG. 2 essentially consists of the three diaphragm plates 50, 51 and 52 and the five pressure chambers 53, 54, 55, 56 and 57 sealed against one another.
  • Each of the three diaphragm plates 50, 51, 52 is provided with sealing membranes 58 , 59, 60 sealed against the housing 61 of the safety control member.
  • the set amount of hydrocarbons for the individual nozzle flows from the rotatable control unit to the safety control element via line 6. Accordingly, the same gas pressure prevails in the bridging space 53 as in the feed line 6. This pressure is also communicated to the pressure space 53 on the diaphragm plate 52 via the connection 62
  • the pressure in the pressure chamber 53 also prevails in the pressure chamber 55.
  • the line path leads via the connection 62, the opened seal 63 and the bore 64 in the membrane plate 51 to the pressure chambers 53 and 55.
  • the membrane plate 50 which works against the spring force of the spring 65, releases a passage cross section 68 on the seal 67 via the connecting piece 66. Via this passage cross-section 68, the hydrocarbon gas flows from the line 6 via the pressure chamber 53 into the pressure chamber 54 and leaves it via the outlet opening 69 and finally reaches the nozzle through the individual nozzle line 8.
  • the safety control element Since the pressure of the pressure chamber 53 prevails in the pressure position 55 in this switching position of the diaphragm plate 51, the safety control element now acts as a servo-controlled check valve. This is because the inlet pressure over 55 opens on the diaphragm 58 and the outlet pressure over 54 closes the valve disk 70; in addition, a spring 65 has a closing effect. Force equilibrium is reached when the inlet pressure 55 is 0.2 bar higher than the outlet pressure 54; the spring 65 is designed accordingly. This gives a constant pressure drop of 0.2 bar at the passage cross section. This reliably prevents media from flowing back from the pressure chamber 54 into the pressure chamber 53, that is to say in the reverse flow direction.
  • the pressure chamber 56 is connected to the oxygen pressure of the nozzle via the feed line 71.
  • the oxygen pressure is normally communicated to the pressure chamber 56 via a pressure transmitter with an inert gas, for example nitrogen.
  • Another function of the safety control element is to compare the hydrocarbon pressure in the pressure chamber 54 with the oxygen pressure at the nozzle and in any case to set the hydrocarbon pressure lower than the oxygen pressure.
  • the diaphragm plate 51 changes its position, and the seal 72 opens, so that there is a connection between the pressure chamber 56 and the pressure chamber 55.
  • the seal 63 closes and blocks access from the pressure chamber 53 via the feed 62 to the pressure chamber 55.
  • the membrane plate 51 works with a so-called flip-flop characteristic, ie. H. either seal 63 seals and seal 72 is open, or vice versa.
  • the diaphragm plate 50 compares this pressure with the pressure space 54 in the manner described, and only when there is a sufficiently large pressure difference between the two pressure spaces can the hydrocarbon gas from the pressure space 53 pass through the flow cross section 68 in reach the pressure chamber 54.
  • the interaction of the diaphragm plates 50 and 51 in each case the lower pressure from the pressure spaces 53 or 56 takes effect in order to set a sufficient pressure difference between the pressure spaces 54 and 55, i. H. the pressure of the hydrocarbon gas in line 69 is lower than the lower gas pressure in pressure chamber 53 or 56 in each operating case.
  • the safety control device also monitors the flow rate of the gaseous hydrocarbons and triggers a signal as soon as a minimum amount is undershot.
  • the pressure of the gaseous hydrocarbons is supplied to the pressure chamber 57 as it prevails in front of the quantity regulating member in the rotatable control unit in the distribution chamber 4.
  • the membrane plate 52 is in the position shown. This is the normal operating case.
  • the diaphragm plate 52 changes its position, supported by the spring force of the spring 73.
  • the permanent magnet 74 thus approaches the magnetic switch 75 and switches on an electrical signal.
  • the pressure difference at the flow regulator is a direct measure of the flow rate of the gaseous hydrocarbons. In practice, it has proven to be advantageous to trigger this signal at a differential pressure of 1.08 bar, which can be set by means of a corresponding spring 73.
  • the electrical signal is routed via the sliding contact unit 31 described on the rotatable control unit to any display point, for example in the converter control station.
  • the pressure difference between the pressure spaces 57 and 53 can also be transmitted and displayed analogously.
  • the membrane plate 52 then takes over the function of a conventional differential pressure measuring device.
  • the analog differential pressure display instead of a signal at critical differential pressure is a way to continuously monitor the supply of hydrocarbons to the nozzles and the function of the safety control.
  • the arrangement of the safety control element upstream of the nozzle in front of the rotatable control unit offers, in addition to the advantages described, a further considerable advantage. If, during operation of the nozzles, gases under a higher pressure, such as oxygen, flow into the nozzle feed lines, the safety control element reacts in the manner described, for example as a servo check valve, and thus protects the rotatable control unit. In previous practice, it has proven to be particularly disadvantageous if similar control and monitoring devices are accommodated in rooms that are no longer at risk of temperature, away from the converter. In the event of malfunctions, damage occurs on the relatively complicated multiple rotary unions.
  • FIG. 3 shows an oxygen blow-through converter, consisting of a sheet steel jacket 80 with the refractory lining 81. Above the converter opening 82 is the gas hood 83 with which the converter exhaust gases are fed to the gas cleaning system, not shown.
  • the converter 80 is non-positively connected to a converter support ring 84.
  • the two pivots 85 and 86 are located on the converter support ring 84.
  • the pivots 85 and 86 are mounted in the bearings 87 and 88 and enable the converter to rotate.
  • the drive for the converter rotary movement is carried out by motors and gears in the structural unit 89.
  • the converter drive 89 and the bearings 87 and 88 are firmly connected to the concrete foundation 91 by mounting blocks 90.
  • Nozzles 94 are located in the floor lining 92 on the bottom plate 93 of the oxygen blow-through converter.
  • the central tubes of the nozzles 94 constructed from two concentric tubes are supplied with oxygen and dust-like slag formers via the manifold 95 and the suspension distributor 96.
  • the feed line 95 passes through the pivot pin 85 and a rotary feedthrough, not shown, to the suspension distributor 96.
  • the annular gaps of the nozzles 94 are supplied with liquid or gaseous hydrocarbons.
  • the pressure-controlled switch valve 97 on the nozzle flange 98 switches the hydrocarbon supply as a function of pressure.
  • Each nozzle has a separate line for gaseous 99 and liquid hydrocarbons 100.
  • the nozzle supply lines 99, 100 for gaseous and liquid hydrocarbons are led upstream through the converter pivot 86 to the control device 101 according to the invention.
  • the device 101 is shown approximately to scale and is firmly connected to the converter pivot 86. connected.
  • FIG. 4 shows a further embodiment of the device for supplying the nozzles with gaseous and / or liquid hydrocarbons.
  • the device is supplied with gaseous hydrocarbons through the manifold 105 and with liquid hydrocarbons through the manifold 106.
  • the hydraulic fluid is supplied to the device through the line 107.
  • the control piston 108 of the device is moved in the axial direction according to the control commands and regulated by the hydraulic control unit 109.
  • the other functions of the device shown in FIG. 4 correspond to that shown in FIG. 1.
  • An OBM converter with 60t capacity and 10 floor nozzles is used to produce steel with an increased scrap rate. To do this, you first charge 22 tons of scrap into the empty converter and use the floor nozzles as an oil-oxygen burner for preheating.
  • the oil collecting line 24 is fed to the rotatable control unit with an oil quantity of 75 l / min and a pressure of 31 bar.
  • This quantity of oil is distributed evenly over the annular gaps of the 10 nozzles via the quantity regulating members 27 and 28.
  • the oil passes through the individual feed lines 29 to a T relay at the nozzle end, which releases the path to the nozzle ring gap due to the pressure present.
  • the free cross section between the conical bore 27 and the regulating pin 28 is approximately 2 mm 2 and the pressure drop is approximately 26 bar.
  • a total of 150 Nm 3 / min of oxygen are fed to the nozzles at the same time.
  • the converter After the preheating period has ended, the converter is charged with 44 t of pig iron.
  • the oil supply to the collecting line 24 has already been interrupted at this time, and nitrogen flows through the annular gap of the nozzles, which is supplied via the collecting line 3 and the nozzle supply lines 8.
  • the pressure-controlled T-relay on the nozzle flange switched over at this point in time, as the higher pressure is now present on the individual nozzle supply lines for gas.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
EP79101915A 1978-06-13 1979-06-13 Vorrichtung zur Versorgung von Konverterdüsen mit gasförmigen und/oder flüssigen Kohlenwasserstoffen Expired EP0007418B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79101915T ATE80T1 (de) 1978-06-13 1979-06-13 Vorrichtung zur versorgung von konverterduesen mit gasfoermigen und/oder fluessigen kohlenwasserstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2825851A DE2825851B1 (de) 1978-06-13 1978-06-13 Vorrichtung zur Versorgung von Duesen mit gasfoermigen und/oder fluessigen Kohlenwasserstoffen
DE2825851 1978-06-13

Publications (2)

Publication Number Publication Date
EP0007418A1 EP0007418A1 (de) 1980-02-06
EP0007418B1 true EP0007418B1 (de) 1981-06-10

Family

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Application Number Title Priority Date Filing Date
EP79101915A Expired EP0007418B1 (de) 1978-06-13 1979-06-13 Vorrichtung zur Versorgung von Konverterdüsen mit gasförmigen und/oder flüssigen Kohlenwasserstoffen

Country Status (4)

Country Link
US (1) US4261551A (enrdf_load_stackoverflow)
EP (1) EP0007418B1 (enrdf_load_stackoverflow)
AT (1) ATE80T1 (enrdf_load_stackoverflow)
DE (2) DE2825851B1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU83501A1 (fr) * 1981-07-20 1983-04-06 Mecanarbed Sarl Joint tournant a raccords multiples
US4428564A (en) * 1982-01-26 1984-01-31 Pennsylvania Engineering Corporation Metallurgical vessel
DE3624966A1 (de) * 1986-07-24 1988-01-28 Mannesmann Ag Metallurgisches gefaess mit kippzapfen, insbes. stahlwerkskonverter
US5188661A (en) * 1991-11-12 1993-02-23 Cook Donald R Dual port lance and method
AT408634B (de) * 1997-04-04 2002-01-25 Trodat Gmbh Stempelkissen
DE202012012688U1 (de) * 2012-03-05 2013-09-10 GAT Gesellschaft für Antriebstechnik mbH Drehdurchführung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1253581A (en) * 1968-02-24 1971-11-17 Maximilianshuette Eisenwerk Improvements in processes and apparatus for making steel
LU58309A1 (enrdf_load_stackoverflow) * 1969-02-27 1969-07-15
DE2161000C3 (de) * 1971-12-09 1975-04-17 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Verfahren und Vorrichtung zur gleichmäßigen Zuteilung und wechselweisen Zuführung von flüssigen oder gasförmigen Schutzmedien für Frischgasdüsen in einem Konverter
US3893658A (en) * 1971-12-29 1975-07-08 Pennsylvania Engineering Corp Multiple gas feed rotary joint for metallurgical vessels
DE2326754C3 (de) * 1973-05-25 1978-04-20 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Vorrichtung zum gesteuerten Zuführen eines Frischgases und eines fluiden Schutzmediums
FR2298757A1 (fr) * 1975-01-22 1976-08-20 Creusot Loire Joint tournant
US4139368A (en) * 1977-10-11 1979-02-13 Pennsylvania Engineering Corporation Metallurgical method

Also Published As

Publication number Publication date
DE2825851B1 (de) 1979-12-20
DE2825851C2 (enrdf_load_stackoverflow) 1980-08-21
ATE80T1 (de) 1981-06-15
DE2960401D1 (en) 1981-09-17
US4261551A (en) 1981-04-14
EP0007418A1 (de) 1980-02-06

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