US3783937A - Apparatus for cooling a continuous casting mould - Google Patents

Apparatus for cooling a continuous casting mould Download PDF

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Publication number
US3783937A
US3783937A US00207167A US3783937DA US3783937A US 3783937 A US3783937 A US 3783937A US 00207167 A US00207167 A US 00207167A US 3783937D A US3783937D A US 3783937DA US 3783937 A US3783937 A US 3783937A
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United States
Prior art keywords
water
container
casting mould
cooling water
conduit
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Expired - Lifetime
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US00207167A
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English (en)
Inventor
A Maurer
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Voestalpine AG
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Voestalpine AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to an apparatus for cooling a [30] Foreign Application Priority D t continuous casting mould, comprising a cooling water D80. 16 1970 Austria 11303/70 Supply conduit emergency 001mg water Supply conduit and a cooling water return conduit, all three 52 us. 01. 165/107 164/128 heihg Jhihed ah Overhead which 51 1111. c1 1522a 7/04 its greatest is filled with hiler feed Wateh At [58] Field 61 Search 165/11 106 107 the uPPer Part 0f Said overhead contain" a Space 165/137.
  • the invention relates to an apparatus for cooling a continuous casting mould comprising a supply conduit for cooling water through which the cooling water is guided to the continuous cooling water supply conduit with a return valve, an emergency cooling water supply conduit with a return valve joined to an overhead container, said return valve of the emergency cooling water supply conduit being closed when the pump operates and being automatically opened when the pump fails, and a cooling water return conduit.
  • Cooling apparatus for continuous casting moulds have to be chosen with great care, in particular when steel is cast continuously.
  • the cooling water temperature has to be regulated exactly and the formation of steam bubbles has to be avoided.
  • the wall of the continuous casting mould immediately melts through which may lead to explosions owing to the formation of detonating gas and to a damage of the continuous casting plant.
  • care has to be taken that the coolant stream remains uninterrupted. It has already been proposed (Austrian Pat. No. 175 671) to arrange above the mould an open overhead container, which is connected with the continuous casting mould by means of a conduit containing a return valve.
  • cooling water supply conduit In cases of disturbances, eg, in case of a failure of the current supply, in the cooling water supply conduit a return valve is closed bypressure decrease and at the same time the return valve in the emergency cooling water supply conduit is opened so that from the overhead container cooling water may be guided into the continuous casting mould.
  • this known plant cleaned water is used which is supplied at a temperature of about 30 C from a further container to the continuous casting plant and is heated by about 6 C in running through.
  • the cooling water consumption will amount to from 120 to 1,000 m /h.
  • the invention is aimed at avoiding these difficulties and disadvantages and in an apparatus for cooling continuous casting moulds of the kind defined in the introduction resides in that the supply conduit and the return conduit for the cooling water are joined to the 2 overhead container which for its greatest part is filled with boiler feed water, the cooling water system and the overhead container being sealed against the atmosphere by means of a space filled with a pressurized medium such as gas or steam, representing an elastic pressure cushion.
  • a pressurized medium such as gas or steam
  • the pressure space in the upper part of the overhead container is filled with an inert gas, e.g., nitrogen, and connected via a conduit to a water tank which is preferably provided with a level regulating means and a fresh water supply conduit coacting therewith.
  • an inert gas e.g., nitrogen
  • the pressure cushion is suitably adjustable to a pressure of 0.3 to 0.4 atmospheres gauge.
  • a cylindrical vessel in the cooling water container, in the area of the boiler feed water, a cylindrical vessel is provided which is closed at its lower end by a bottom and open at its upper end, and the cooling water return conduit ends in the vicinity of the bottom of the cylindrical vessel.
  • the level difference between the joining places of the emergency cooling water supply conduit at the cooling water container and at the continuous casting mould amounts to at least 5 m.
  • the cooling water container and the water tank are provided with-level regulating means and level regulating valves built in in respective water supply conduits.
  • a heat exchanger is provided in the cooling water supply conduit.
  • Numeral 1 denotes a continuous casting mould made of copper, to whose cooling jacket boiler feed water is guided by means of the cooling water supply conduit 2.
  • Numeral 3 denotes the cooling water return conduit. The conduits 2 and 3 are joined to a closed cooling water container 4.
  • a pump 5 By a pump 5 the warmed cooling water is supplied from the cooling water container 4 into a heat exchanger 6 and cooled there.
  • the coolant supply and drain conduits for the heat exchanger 6 are denoted with 7 and 8. Pressurized air or water may be used as coolant.
  • Numeral 9 denotes a volume regulating valve in the coolant drain conduit 8 which valve is connected with a temperature regulating means 10 by means of an impulse line ill.
  • the temperature regulating means 10 is in its turn connected via an impulse line 12 to the cooling water supply conduit 2 after the heat exchanger.
  • Numeral l3 is a device for measuring the throughflow which is joined to a measuring orifice 15 via an impulse line 14.
  • Numeral 16 denotes a throughflow adjustment device which is connected via an impulse line 17 with a control valve 18.
  • Numeral 1% denotes a return valve which is open when the pump 5 operates.
  • Numeral 20 denotes a temperature measuring means for ascertaining the difference between the temperature when the water enters and the temperature when the water flows out of the mould, which means is joined to the cooling water conduits 2 and 3 via the impulse line 21.
  • the closed cooling water container 4 is primarily filled with boiler feed water, the maximum level being denoted with 22.
  • a pressure space 23 is situated which is suitably filled with an inert gas, e.g. nitrogen; thus, a protection is obtained for the mould and the conduits against corrosion and boiler scale; the gas pressure is adjusted to 0.3 to 0.4 atmospheres gauge, and the gas may be supplied through the conduit 24 via a closing member 25.
  • Numeral 26 denotes asupply conduit for the boiler feed water; a return valve 27 and a level regulating valve 28 are built in in said conduit.
  • the level regulating valve 28 is connected via an impulse line 29 with a level regulating means 30 arranged at the plane 22.
  • a water volume of about m is present in the cooling water container which volume is sufficient for cooling a continuous casting mould with a cross section of e.g., 2,000 X 300 mm and for a casting output of about 1.5 mt steel/- min.
  • Numerals 31,32 and 33 denote level alarm devices which are arranged on the planes 34, 35, 36 and start to function one after the other as soon as the water level in the cooling water container 4 sinks below the level 22.
  • the area between the planes 22 and 34 is regarded as normal expansion or puffer area.
  • the device 31 gives alarm and at the same time the boiler feed water is replenished via the conduit 26.
  • the water level does not sink below the level 34.
  • the cooling water may sink to the level 35 where a further alarm is given by the device 32 so that casting may be inter rupted.
  • the device 33 gives main alarm.
  • the pressure space 23 of the cooling water container 4 is connected by a connecting conduit 37 to a water tank 38 which is filled with clean water or drink water to the level 22; it may be refilled by a conduit 39 which contains a directly controlled (without current) level control valve 40 which is kinematically connected with a float 42 via a rod 41.
  • Numeral 43 denotes a vent pipe containing a valve 44.
  • the water tank 38 may be emptied by a conduit 45 comprising a valve 46.
  • the vertical extension of thewater tank 38 or of the part of the connecting conduit 37 arranged in it is adjusted to the gas pressure present in the pressure space 23 of the container 4: during normal operation this gas pressure will displace the water column in the connecting conduit 37 to about the plane 47 so that also in case of pressure differences a gastight closure of the pressure space 23 remains intact; the boiler feed water in the cooling water container 4 thus cannot get into contact with air.
  • the pressure space 23 over pressure is created, e.g., owing to the formation of steam, the water column in the connecting conduit 37 is displaced to the level 48 so that the steam bubbles in the water column of the water tank 38 ascend and condense; thus, it is impossible that too high a steam pressure in the pressure space 23 is created.
  • a cylindrical vessel 50 is built in the cooling water container 4; said vessel has relatively a small diameter, it is closed at its lower end by a bottom 51 and open at its upper end, and it is communicatingly connected with the boiler feed water.
  • the cooling water return conduit 3 is guided within this vessel 50 to the vicinity of the floor 51.
  • the water flowing back from the mould 1 via the cooling water return conduit 3 contains small steam bubbles which form at the mould walls. These steam bubbles are condensed when the cooling water ascends in the water column in the vessel 50.
  • Numeral 52 denotes an emergency cooling water supply conduit which is connected with the lower end of the cooling water container 4; this conduit contains a return valve 53 which is closed in normal operation; said conduit is joined to the operational cooling water supply conduit 2 and thus leads to the mould l.
  • the emergency cooling water supply conduit 52 enters into function in the case of a current failure, i.e. when the pump 5 stands still; in this case the return valve 19 closes automatically and the return valve 53 opens automatically.
  • Numeral 54 denotes a conduit for emptying the cooling water container 4; said conduit contains a valve 55.
  • the cooling water container 4 has to be arranged so high above the mould 1 that the level difference H between the level 56 determined by the cooling water outflow and the plane 57 determined by the cooling water entry amounts to at least 5 m, so that in case of disturbances the plant may safely continue to function and a natural cooling water circulation takes place.
  • the temperature of the cooling water in the continuous casting mould obviously increases from about 30 C to a maximum of about 1 10 C and the formation of steam increases as well.
  • the cooling water containing hot steam bubbles gets via the cooling water return conduit 3 into the vessel 50 where it ascends by thermosyphon effect i.e., under formation of a natural cooling water circulation and is cooled; the steam bubbles condense thereby.
  • the pressure in the pressure space 23 increases owing to the not condensed steam, until finally the water column present in the connecting conduit 37 is pressed down to the level 48 so that then steam is condensed in the clean water or drinking water of the water tank 38.
  • the water level in the cooling water container 4 sinks too low for example below the level 34 fresh, cold boiler feed water is supplied into the system through the supply conduit 26 by operating the level control valve 28, unitl the steam condenses and the pressure in the pressure space 23 returns to the normal value of 0.3 to 0.4 atmospheres.
  • the continuous casting mould 1 cannot steam out and be destroyed.
  • the water pressure in the emergency cooling water supply conduit 52 is greater at the entry into the mould 1 than at the exit into the conduit 3 so that the steam bubbles formed at the walls of the mould may more easily be guided off.
  • a further advantage of the plant resides in that the apparatus is not subjected to the rigorous conditions for steam boilers because the gas pressure employed does not exceed 0.3 to 0.4 atmospheres gauge; the plant may also be operated with steam pressure but this is more expensive and makes the operation more complicated. Obviously, it is possible that several continuous casting moulds can be joined to a common cooling water container 4.
  • An apparatus for cooling a continuous casting mould comprising a casting mould a closed container
  • the container being positioned above the casting mouldand being at least partially filled with cooling water, a pressurized inert gas in the container forming an elastic pressure cushion above the cooling water, a first supply conduit from the container to the casting mould, a return conduit from the casting mould to the container, pump means for supplying the cooling water in the container to the casting mould and returning the water from the casting mould to the container, flow regulating means for providing a predetermined amount of water to the casting mould, temperature regulating means for maintaining the temperature of the water in the casting mould at a predetermined temperature, a second supply conduit from the container to the casting mould, and valve means connected to the second supply conduit and adapted to be opened only when the pump fails, the container, conduits, and casting mould being sealed from the atmosphere forming a primary and emergency closed cooling circulation system.
  • the apparatus set forth in claim 1 further comprising a tank and a connecting conduit, the tank at least partially filled with water, having a water supply conduit and a water level regulating means, and the connecting conduit in communication with the water in the tank and the inert gas in the closed container.
  • a cylindrical vessel is provided which is closed at its lower end by a bottom and open at its upper end, and the return conduit ends in the vicinity of said bottom within said cylindrical vessel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US00207167A 1970-12-16 1972-12-13 Apparatus for cooling a continuous casting mould Expired - Lifetime US3783937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1130370A AT308302B (de) 1970-12-16 1970-12-16 Vorrichtung zum Kühlen einer Stranggießkokille

Publications (1)

Publication Number Publication Date
US3783937A true US3783937A (en) 1974-01-08

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ID=3627973

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Application Number Title Priority Date Filing Date
US00207167A Expired - Lifetime US3783937A (en) 1970-12-16 1972-12-13 Apparatus for cooling a continuous casting mould

Country Status (13)

Country Link
US (1) US3783937A (xx)
JP (1) JPS4942218B1 (xx)
AT (1) AT308302B (xx)
BE (1) BE776720A (xx)
BR (1) BR7108347D0 (xx)
CA (1) CA936329A (xx)
CH (1) CH527009A (xx)
ES (1) ES397982A1 (xx)
FR (1) FR2117950B1 (xx)
GB (1) GB1356479A (xx)
IT (1) IT944025B (xx)
SE (1) SE373053B (xx)
SU (1) SU473337A3 (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4959013A (en) * 1988-08-29 1990-09-25 Sol Gingi-Pak, A Division Of Belport Co., Inc. Recycling, liquid medium temperature altering apparatus
US6543519B2 (en) * 2000-04-25 2003-04-08 Sms Demag Aktiengesellschaft Method and device for thermal control of a continuous casting mold
US20030178172A1 (en) * 2000-09-05 2003-09-25 Markku Koivisto Cooling method and equipment for continuous upward casting of metals
US20070074846A1 (en) * 2003-02-28 2007-04-05 Hubert Sommerhofer Continuous casting method
WO2015132237A1 (de) * 2014-03-06 2015-09-11 Inteco Special Melting Technologies Gmbh Verfahren und anlage zur kühlung von flüssigkeitsgekühlten kokillen für metallurgische prozesse
CN109351927A (zh) * 2018-12-05 2019-02-19 联峰钢铁（张家港）有限公司 一种连铸机结晶器冷却水循环***

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2765031C1 (ru) * 2020-12-01 2022-01-24 Общество с ограниченной ответственностью "Техно Терм-Саратов" Способ литья с формированием однородной мелкозернистой структуры металла

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711882A (en) * 1952-01-12 1955-06-28 Westinghouse Electric Corp Electrical apparatus
US2994514A (en) * 1957-11-20 1961-08-01 Gaylord W Brown Recirculating temperature controlled fluid supply system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2711882A (en) * 1952-01-12 1955-06-28 Westinghouse Electric Corp Electrical apparatus
US2994514A (en) * 1957-11-20 1961-08-01 Gaylord W Brown Recirculating temperature controlled fluid supply system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4959013A (en) * 1988-08-29 1990-09-25 Sol Gingi-Pak, A Division Of Belport Co., Inc. Recycling, liquid medium temperature altering apparatus
US6543519B2 (en) * 2000-04-25 2003-04-08 Sms Demag Aktiengesellschaft Method and device for thermal control of a continuous casting mold
US20030178172A1 (en) * 2000-09-05 2003-09-25 Markku Koivisto Cooling method and equipment for continuous upward casting of metals
US20070074846A1 (en) * 2003-02-28 2007-04-05 Hubert Sommerhofer Continuous casting method
WO2015132237A1 (de) * 2014-03-06 2015-09-11 Inteco Special Melting Technologies Gmbh Verfahren und anlage zur kühlung von flüssigkeitsgekühlten kokillen für metallurgische prozesse
CN109351927A (zh) * 2018-12-05 2019-02-19 联峰钢铁（张家港）有限公司 一种连铸机结晶器冷却水循环***

Also Published As

Publication number Publication date
GB1356479A (en) 1974-06-12
SE373053B (xx) 1975-01-27
AT308302B (de) 1973-06-25
ES397982A1 (es) 1974-07-01
BE776720A (fr) 1972-04-04
CA936329A (en) 1973-11-06
FR2117950B1 (xx) 1975-02-07
CH527009A (de) 1972-08-31
IT944025B (it) 1973-04-20
SU473337A3 (ru) 1975-06-05
BR7108347D0 (pt) 1973-05-29
FR2117950A1 (xx) 1972-07-28
JPS4942218B1 (xx) 1974-11-13

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