EP0038577A1 - Installation de refroidissement pour fours électriques - Google Patents

Installation de refroidissement pour fours électriques Download PDF

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Publication number
EP0038577A1
EP0038577A1 EP81200112A EP81200112A EP0038577A1 EP 0038577 A1 EP0038577 A1 EP 0038577A1 EP 81200112 A EP81200112 A EP 81200112A EP 81200112 A EP81200112 A EP 81200112A EP 0038577 A1 EP0038577 A1 EP 0038577A1
Authority
EP
European Patent Office
Prior art keywords
emergency
coolant
heat exchanger
pump
primary
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.)
Ceased
Application number
EP81200112A
Other languages
German (de)
English (en)
Inventor
Otto Hochstrasser
William S. Ruby
Frank V. Madaffore
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0038577A1 publication Critical patent/EP0038577A1/fr
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/24—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the present invention relates to the cooling of electric induction furnaces and relates in particular to new methods and devices for emergency cooling of such furnaces.
  • the primary cooling liquid is specially pretreated, for example demineralized, in order to prevent corrosion and deposits in the various coils and passages through which flow passes.
  • an additive such as glycol is added to prevent freezing when the stove is shut down in cold weather.
  • These pretreatments are quite expensive.
  • the flow path of the primary cooling liquid is arranged as a closed circuit, and the external primary heat exchanger works with indirect heat exchange, i.e. the heat from the cooling liquid is transferred through pipe walls to another liquid that does not come into direct contact with the cooling liquid.
  • a circulation pump is arranged in the closed circuit and pumps the primary cooling liquid so that the same liquid circulates through the furnace, through the indirect primary heat exchanger and back again through the furnace.
  • the emergency cooling arrangement consisted of devices for supplying an emergency cooling liquid into the system.
  • An emergency coolant line is usually provided, which is connected to an urban water supply serving as a source of emergency coolant.
  • a valve in the emergency coolant line opened and city water was forced into and through the stovepipes under its own pressure; the emergency coolant, i.e. the city water, the primary coolant in front of it and expelling it through a drain.
  • the prior art emergency cooling system was simple and easy to use, but had two disadvantages. First, it caused a loss of the expensive primary coolant. Secondly, it also caused the furnace cooling system to be charged with untreated water, which increased the potential risks of corrosion and build-up.
  • the present invention solves these problems of the prior art and creates new and effective arrangements for cooling an electric furnace in the event of a malfunction in the primary coolant pump system or in the primary heat exchanger.
  • these new leaders regulations for the loss of the processed primary coolant, and the primary cooling system is exposed to corrosive and batch-promoting effects of the emergency coolant.
  • the subject of the present invention is first of all the new arrangements for emergency cooling, which are made in such a way that at least a part of the primary cooling liquid is allowed to flow through a bypass line in order to bypass the separate heat exchanger and through a second heat exchanger in the bypass line.
  • a pressurized emergency coolant such as water from the city supply, is passed through the second heat exchanger and the flow energy of the emergency coolant is used to convey the primary coolant through the bypass line and through the second heat exchanger.
  • the invention further relates to a bypass line in an electric furnace cooling system in order to let at least a part of the primary cooling liquid bypass its primary heat exchanger.
  • a second heat exchanger is connected to this bypass line.
  • An emergency coolant line is also provided to supply a flow of emergency coolant, e.g. Water from an urban supply to pass through the second heat exchanger;
  • devices are also provided in order to use the flow energy of the emergency cooling liquid to convey the primary coolant through the bypass line and through the second heat exchanger.
  • the present invention uses a hydraulic motor which is arranged in the emergency coolant line and a pump in the bypass line.
  • a device such as a common shaft is provided between the rotors of the motor and the pump.
  • the flow of the emergency coolant through the emergency line rotates the rotor of the motor and this in turn drives the pump rotor.
  • the flow energy of the cooling liquid in the emergency coolant line is thus used to convey the primary coolant through the bypass line and through the second heat exchanger.
  • Fig. 1 produces one Conventional induction furnace 10, which is provided with a closed circulation cooling system including a primary heat exchanger L2, a coolant outflow line 14 running from the furnace to the heat exchanger 12 and a coolant return line 16 running from the heat exchanger to the furnace.
  • a circulation pump 18 is arranged in the outflow line 14.
  • the system is filled with a primary cooling liquid, such as treated water, which is circulated by means of the pump 18 through cooling coils in the furnace 10 (not shown) and through a coil arrangement 20 in the primary heat exchanger 12.
  • the primary coolant absorbs heat in the furnace coils and transfers this heat to the primary heat exchanger 12.
  • a fan 22 is provided which presses air over the coil arrangement 20 in order to cool the primary cooling liquid before it is returned to the furnace.
  • the cooling system according to FIG. 1 further comprises an air / water separator 24 which is connected upstream of the pump 18 in the outflow line 14.
  • the air / water separator also has a riser 26 which leads to an expansion vessel 28 arranged a few meters above the separator 24. This is provided on the inside with a spray head 30 which receives fresh water from an external source (not shown) via a supply line 32.
  • an outflow is provided in the expansion vessel 28, which comprises a gas outlet 34 and a drain 36.
  • a bypass line 38 around the primary heat exchanger 12 is provided, which runs in the vicinity thereof between the outflow or return lines 14 and 16 and is connected to these; a bypass valve 40 is also arranged in the bypass line. Furthermore, bypass control valves 42, 44, 46 and 48 are located in the outflow or return lines 14 and 16 on both sides of the bypass line 38. By regulating the open position of the valves 40, 42, 44, 46 and 48, the primary coolant can be the primary heat exchanger 12 partially or completely bypassed.
  • the furnace 10 has associated electrical power supply devices 50 that operate in a known manner to supply the furnace with the appropriate electrical energy. These electrical devices are also cooled by the primary liquid, and branch outlet or return lines 14a and 16a are provided for this purpose, which run from the cooling coils (not shown) next to the electrical mains connection devices 50 to the main outlet and return lines 14 and 16, respectively to run.
  • An emergency cooling arrangement is also provided in the cooling system of the prior art according to FIG. 1.
  • This emergency cooling arrangement comprises an emergency coolant supply line 52 which is connected to a source of emergency coolant (not shown), e.g. an urban water supply is connected.
  • An emergency cooling control valve 54 and a check valve 56 are arranged in the emergency coolant supply line 52, which is connected to the return line 16.
  • the emergency cooling control valve opens and the emergency cooling liquid enters the cooling system and runs through the coils of the furnace 10 and out through the outlet line 16 to the air / water separator 24.
  • This emergency cooling liquid displaces the primary cooling liquid and presses it out of the line 16 upwards through the air / water separator 24 and the riser 26 into the expansion vessel 28, from where it is discharged via the outlet 36.
  • a one-way check valve 58 is arranged in the return line 16 upstream of the emergency coolant supply line 52, and a further check valve 60 is arranged in the outflow branch line 14a.
  • the cooling system according to the invention shown in FIG. 2 uses an emergency cooling arrangement which differs from that described in connection with FIG. 1.
  • an emergency bypass line 70 is provided which runs between the furnace coolant outflow line 14 and the return line 16 and connects them to one another.
  • An indirect water / water heat exchanger 72, an emergency coolant pump 74 and a check valve: 76 are connected to the emergency bypass line 70.
  • An emergency coolant line 78 is also provided. At one end, conduit 78 is connected to a source of pressurized emergency cooling water, such as a continuous water supply (not shown).
  • An emergency water valve 80 is arranged in line 78.
  • the emergency coolant line 78 runs from the valve 80 through the water / water heat exchanger 72 and through a hydraulic motor 82 to the duct.
  • the water / water heat exchanger 72 can be formed in any well known manner, preferably as a conventional tube construction, and arranged so that the emergency cooling water flows through the jacket as the primary coolant in the bypass line 70 flows through the tube.
  • the hydraulic motor 82 can be a reversely connected centrifugal pump in such an arrangement that the emergency cooling liquid, ie the pressurized water from the urban water supply, flows in through its outlet and flows out of its inlet. This reverse flow of water through the pump causes it to be driven like a turbine.
  • the hydraulic motor 82 and the emergency pump 74 have a common rotor shaft 84. The flow of city water through the turbine motor 82 causes the latter to rotate the shaft 84, which in turn drives the pump 74.
  • pump 74 circulates the primary coolant in the system through furnace 10 and through water / water heat exchanger 72.
  • the primary cooling liquid is cooled again and circulates back through the furnace.
  • the primary coolant remains in the system even in an emergency situation and is not exposed to the city water.
  • the emergency coolant from the urban water supply simultaneously provides cooling via the water / water heat exchanger 72.
  • the flow energy of the emergency coolant is used to drive the turbine motor 82, which in turn drives the pump 74, to maintain the primary coolant circuit between the furnace and the heat exchanger .
  • both the pump 74 and the check valve 76 are arranged such that the primary cooling liquid is conveyed through the furnace 10 in the same direction as in normal operation. Accordingly, similar cooling conditions are maintained during emergency cooling as in normal operation. It should also be noted that both the pump 74 and the motor 82 are arranged downstream of the heat exchanger 72 in terms of their flows. This serves to moderate the temperature of the fluids running through the motor and pumps.
  • the furnace 10 contains a ceramic crucible 86 mounted on a base plate 88 within a frame 90. At the upper end the crucible 86 is hinged Cover 92 provided.
  • An induction coil 94 made of commercially available, hollow copper rods surrounds the crucible 86, and the ends of this coil are connected to terminals 98 via power cables 96.
  • AC power from an external source (not shown) is applied to terminals 98 and through cables 96 to coil 94.
  • the resulting current flow through the coil causes heating inside the crucible 86, the is sufficient to melt a metal batch 100 contained therein or to keep it in the molten state.
  • the alternating current in the coil 94 also leads to the build-up of magnetic fields, which generate flows of the molten metal within the crucible, so that an automatic stirring action occurs, as shown by the curved arrows in FIG. 3.
  • the cables 96 are also hollow and, in addition to electric current, convey the cooling liquid to the coil 94.
  • the cables 96 are connected to the furnace coolant outflow or return lines 14 and 16, respectively.
  • FIGS. 4 and 6 show the construction of the pump 74 and motor turbine 82 used in the system according to FIG. 2.
  • the coolant pump 74 and the turbine motor 82 each consist of a centrifugal pump and are one at the opposite ends common base plate 106 mounted.
  • These pumps are well known per se and can be constructed in the same way, although in the case of the pump serving as the motor turbine 82 there is a connection 108, where the pump outlet would otherwise be located, the connection 108 forming the inlet for the drive fluid.
  • both the pump 74 and the motor turbine 82 are each equipped with a vane rotor 110. These rotors are connected to opposite ends of the common rotor shaft 84.
  • the shaft 84 rotates the rotor 110 of the pump 74, which in turn draws water from the circuit line 70 into its inlet 114 and urges the water out through its outlet and through the furnace 10.
  • Previously known emergency cooling systems required an emergency water flow rate of 38 liters per minute at a pressure of approximately 1.4 kg / cm 2 for a three and a half ton induction furnace. The greater part of this pressure drop was used to lift the water coming out of the furnace to the level of the expansion vessel 24, from where it could flow out via the drain 30.
  • the circulating water need not be pumped to this level, and a flow rate of 38 liters per minute can be achieved with a pump pressure of 0.7 kg / cm 2 .
  • a motor turbine as described here with 114 liters per minute at 3.2 kg / cm 2 of water flowing from the urban supply can drive a centrifugal pump with the required output for delivery.
  • the invention can be applied to any electric heating furnace requiring emergency cooling, whether the furnace contains a molten charge or not.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
EP81200112A 1980-04-18 1981-01-30 Installation de refroidissement pour fours électriques Ceased EP0038577A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/141,589 US4301320A (en) 1980-04-18 1980-04-18 Cooling of electrical furnaces
US141589 1980-04-18

Publications (1)

Publication Number Publication Date
EP0038577A1 true EP0038577A1 (fr) 1981-10-28

Family

ID=22496339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200112A Ceased EP0038577A1 (fr) 1980-04-18 1981-01-30 Installation de refroidissement pour fours électriques

Country Status (2)

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US (1) US4301320A (fr)
EP (1) EP0038577A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022121567A1 (de) 2022-08-25 2024-03-07 Trumpf Laser- Und Systemtechnik Gmbh Vorrichtung und Verfahren zur additiven Fertigung mit frischwasserloser Notkühlung

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789991A (en) * 1988-01-19 1988-12-06 Mannesmann Aktiengesellschaft Cooling system for electric arc furnaces
LU90581B1 (en) * 2000-05-09 2001-11-12 Wurth Paul Sa Coolong system for a mettalurgical furnace
US6986192B2 (en) * 2002-12-02 2006-01-17 Fitch Michael K Method for reclamation of precious metals from circuit board scrap
DE10308982B3 (de) * 2003-03-01 2004-03-04 Ald Vacuum Technologies Ag Verfahren und Vorrichtung zum Ausgleich der im Schmelzraum und im Kühlwassersystem herrschenden Drücke bei einer Sonderschmelzanlage
US6763645B2 (en) * 2003-05-14 2004-07-20 Stanley F. Hunter Protecting building frames from fire and heat to avoid catastrophic failure
US20100236266A1 (en) * 2009-03-23 2010-09-23 Michael Skidmore Geothermal Heating and Cooling System
US20110162821A1 (en) * 2010-01-05 2011-07-07 International Business Machines Corporation Self-pumping liquid and gas cooling system for the cooling of solar cells and heat-generating elements
RU2617071C2 (ru) * 2013-02-21 2017-04-19 Общество С Ограниченной Ответственностью Промышленная Компания "Технология Металлов" Способ охлаждения корпуса плавильного агрегата и плавильный агрегат для его осуществления
FR3071179B1 (fr) 2017-09-18 2019-09-13 Commissariat A L'energie Atomique Et Aux Energies Alternatives Refroidissement de secours de presse isostatique a chaud
DE102018124909B3 (de) * 2018-10-09 2019-10-17 GEDIA Gebrüder Dingerkus GmbH Verfahren und Vorrichtung zum Kühlen eines Werkzeugs

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE583381C (de) * 1926-11-18 1933-09-02 Ferdinand Heyd Dr Ing Verfahren und Vorrichtung zum Kuehlen metallurgischer OEfen, Gussformen u. dgl. mit Hilfe von im Kreislauf gefuehrtem Hochdruckwasser oder Hochdruckdampf
GB664571A (en) * 1949-10-17 1952-01-09 Sigurd Johannes Natanael Nordg An arrangement for cooling melting, open hearth or electrical furnaces, or firing apparatus or other apparatus
DE1103952B (de) * 1955-11-05 1961-04-06 Knapsack Ag Verfahren zum Kuehlen von thermisch besonders hoch beanspruchten Teilen von Industrieoefen, insbesondere von elektrischen OEfen
DE1930405A1 (de) * 1969-06-14 1970-12-17 Rohde Dr Ing Ewald W Verdampfungskuehlung mit stabilisierten Teilkreislaeufen
DE1946731A1 (de) * 1969-09-16 1971-03-18 Rohde Ewald W Dr Ing Verdampfungskuehlung fuer metallurgische OEfen
DE2403741B1 (de) * 1974-01-26 1974-10-10 Demag Ag, 4100 Duisburg Anlage zur Not-Versorgung von Schachtöfen, insbesondere Hochöfen, mit Kühlwasser
DE2905628A1 (de) * 1979-02-14 1980-08-21 Vni I Pi Otschistke T Gazov St Kuehlanlage fuer einen hochofen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE583381C (de) * 1926-11-18 1933-09-02 Ferdinand Heyd Dr Ing Verfahren und Vorrichtung zum Kuehlen metallurgischer OEfen, Gussformen u. dgl. mit Hilfe von im Kreislauf gefuehrtem Hochdruckwasser oder Hochdruckdampf
GB664571A (en) * 1949-10-17 1952-01-09 Sigurd Johannes Natanael Nordg An arrangement for cooling melting, open hearth or electrical furnaces, or firing apparatus or other apparatus
DE1103952B (de) * 1955-11-05 1961-04-06 Knapsack Ag Verfahren zum Kuehlen von thermisch besonders hoch beanspruchten Teilen von Industrieoefen, insbesondere von elektrischen OEfen
DE1930405A1 (de) * 1969-06-14 1970-12-17 Rohde Dr Ing Ewald W Verdampfungskuehlung mit stabilisierten Teilkreislaeufen
DE1946731A1 (de) * 1969-09-16 1971-03-18 Rohde Ewald W Dr Ing Verdampfungskuehlung fuer metallurgische OEfen
DE2403741B1 (de) * 1974-01-26 1974-10-10 Demag Ag, 4100 Duisburg Anlage zur Not-Versorgung von Schachtöfen, insbesondere Hochöfen, mit Kühlwasser
DE2905628A1 (de) * 1979-02-14 1980-08-21 Vni I Pi Otschistke T Gazov St Kuehlanlage fuer einen hochofen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022121567A1 (de) 2022-08-25 2024-03-07 Trumpf Laser- Und Systemtechnik Gmbh Vorrichtung und Verfahren zur additiven Fertigung mit frischwasserloser Notkühlung

Also Published As

Publication number Publication date
US4301320A (en) 1981-11-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT SE

17P Request for examination filed

Effective date: 19810905

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BBC AKTIENGESELLSCHAFT BROWN, BOVERI & CIE.

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Effective date: 19830520

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Inventor name: HOCHSTRASSER, OTTO

Inventor name: RUBY, WILLIAM S.

Inventor name: MADAFFORE, FRANK V.