EP0525136A1 - Device for cooling parts of the vessel of a furnace, especially a metallurgical furnace. - Google Patents
Device for cooling parts of the vessel of a furnace, especially a metallurgical furnace.Info
- Publication number
- EP0525136A1 EP0525136A1 EP92903076A EP92903076A EP0525136A1 EP 0525136 A1 EP0525136 A1 EP 0525136A1 EP 92903076 A EP92903076 A EP 92903076A EP 92903076 A EP92903076 A EP 92903076A EP 0525136 A1 EP0525136 A1 EP 0525136A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- cooling
- heat exchange
- thermal conductivity
- exchange plate
- 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.)
- Granted
Links
Classifications
-
- 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 invention relates to a device for cooling vessel parts of a furnace, in particular a metallurgical one
- cooling box inserted in a wall or lid area to be cooled or forming a wall or lid area, which faces a heat exchange plate facing the inside of the oven and, opposite, spatially distributed, a plurality of spray nozzles for spraying ner coolant on the heat exchange plate, further includes an outlet for the coolant.
- a device of this type with a steel plate as a heat exchange plate has become known, for example, from EP 0 044 512 AI or EP 0 197 137 B1.
- the spraying times of the nozzles individually or in groups by controlling the spraying times of the nozzles individually or in groups, only enough cooling liquid is sprayed against the heat exchange plate that the sprayed cooling liquid essentially evaporates and the enthalpy of vaporization is thus used for cooling .
- so much cooling liquid is sprayed against the heat exchange plate that it essentially remains in its liquid form. In this case, the coolant consumption is significantly higher than in the former case.
- Cooling water systems of this type require, in particular in furnaces in which the heat exchange plate is exposed to strong local and temporal fluctuations in thermal stress, a substantially higher quantity of cooling liquid than spray-cooled systems in order to prevent film boiling, that is to say the occurrence of insulating thin vapor layers Thermally stressed areas of the heat exchange surface. This effect would damage the cooling element in this area.
- AI i.a. describes a cooled wall element for metallurgical furnaces, in particular electric arc furnaces, which contains a steel plate provided on one side with a plating made of copper or a copper alloy and which is covered with metal profiles forming coolant channels on the surface facing away from the plating. Due to the high thermal conductivity of copper, the copper layer on the inner side of the wall element should pass on the absorbed heat very quickly, distribute the heat evenly and ensure rapid heat dissipation, so that material damage is prevented even in the event of local overheating. In addition, the copper layer, which is preferably applied in a thickness of 6 to 10 mm, remains ductile and prevents crack formation in the wall of the cooling element.
- the object of the invention is to improve the cooling effect in a device of the type mentioned in the introduction and to reduce the total amount of coolant required by reducing the temperature differences between the spraying points of the cooling liquid and the areas lying between them.
- the risk of local overheating in the event of a failure of individual nozzles is to be prevented and the escape of coolant in the event of any cracking in the steel plate.
- the heat exchange plate on the side of the spray nozzles has a layer made of a metal which has a substantially greater thermal conductivity than steel, preferably a layer made of copper or a copper alloy, which despite the non-uniform coolant application caused by the cooling system - supply allows a relatively uniform temperature profile over the heat exchange surface.
- the effect is surprisingly achieved with a thickness of the copper layer of 1 to 2 mm. Due to the reduction in the local temperature differences on the heat dissipation side of the heat exchange plate, a significant reduction in the amount of coolant is possible.
- Spray nozzles was clad and once a steel plate of 20 mm which was clad with a 2 mm thick copper layer. In the middle of the thickness of the steel plate at various measuring points above and below the direct area of influence of the spray cooling, thermal elements were used to determine the temperature. A cooling water quantity of 100 l / m 2 -min, customary for spray cooling, was set and the temperature at the measuring points was determined. The most unfavorable temperature value when using the steel plate was 99 ° C and when using the steel plate clad with the copper layer 83 ° C (6 mm thick copper layer) or 82 ° C (2 mm thick copper layer).
- the quantity of spray water was then gradually reduced in the case of the heat exchange plate with the 2 mm thick copper layer, until a temperature of 99.degree. C. was also established at this hottest measuring point.
- the amount of cooling water was 70 l / m 2 -min, ie the measure according to the invention made it possible to save 30% of the amount of cooling water.
- the composite sheet is preferably produced by plating, such as roll, explosive and weld plating. Because of the small layer thickness, it is also possible to spray on, spread on or otherwise apply the metal layer with greater thermal conductivity. It is also within the scope of the invention to provide only partial areas of the heat exchange plate with the layer of improved thermal conductivity or to form this layer with locally different thicknesses.
- FIG. 1 shows the vertical section of part of an electric arc furnace with devices for cooling vessel parts according to this invention
- Fig. 2 in the same representation an arc furnace with a modified cover.
- the arc furnace 1 shown in FIGS. 1 and 2 consists, in a known manner, of a lower vessel holding the melt with refractory lining, an oven wall placed on the edge of the lower vessel, and a lid placed on the oven wall.
- the vessel structure of such a furnace is described, for example, in DE 26 59 827 B1 mentioned in the introduction and in EP 0 197 137 B1.
- the wall and cover are equipped in a known manner with a spray cooling system 3, which spatially distributes a large number of spray nozzles for spraying a cooling liquid, preferably water, onto the heat exchange plate 2 of the cooling boxes facing the furnace interior 6 and one not in FIG. 1 contains the procedure shown for the coolant.
- the drainage of the cooling liquid can be done by pumping, overpressure in the atmosphere of the cold room or simple downpipes.
- the heat exchange plate 2 is designed as a composite sheet with one
- the cover ring 10 is also spray-cooled. However, it can also be cooled by means of a conventional forced water circulation, as shown in FIG. 2.
- the water of the forced circulation cooling can represent a special cycle, but it can also be used for the spray cooling of the cover plate according to FIG. 2.
- one or more drains with a downpipe are used, which are attached to the lowest level of the cooling system at easily accessible locations.
- the outflow is on the tilting side or on the tilting sides.
- the forced circulation also serves as a flow for the spray cooling system 3.
- the cooling water inlet is designated by 11 and the cooling water outlet connected to a downpipe is identified by 12.
- the heat exchange plates 2 of the cooled cover and wall elements are designed as composite sheets.
- the heat exchange plate of the inner cover ring 14, which receives the insert 15 made of refractory material with bushings for electrodes 16, consists of a composite sheet with a copper layer on the side facing the spray nozzles. If necessary, the inner cover ring 14 can also be sprayed with water.
- the reference numeral 17 designates a compressed air line which has two nozzles through which compressed air can be blown into the cooling water outlet 12 or into the safety outlet 13 in order to ensure cooling water discharge in all cases, in particular also in the case of a tiltable vessel to reach.
- the inner surface of the lid is set higher than the upper rim 18 of the vessel, namely by the height of the forced-circulation-cooled lid ring 10. This increases the distance between the inner surface of the lid and the arc at the start of scrap melting and also the leveling process for the operating team relieved when charging the vessel.
Abstract
Un dispositif de refroidissement de parties de l'enveloppe d'un four (1) comprend une boîte de refroidissement encastrée dans une zone à refroidir de la paroi ou du couvercle ou qui forme une zone de la paroi ou du couvercle. La caisse de refroidissement, tournée vers l'intérieur (6) du four, contient une plaque d'échange thermique (2) sur laquelle une pluralité de gicleurs (3) appliquent un liquide de refroidissement. La plaque d'échange thermique (2) est constituée d'une tôle composite formée d'une plaque en acier (8) du côté qui fait face à l'intérieur (6) du four et d'une couche en cuivre (9) du côté des gicleurs.A cooling device for parts of the casing of an oven (1) comprises a cooling box embedded in a zone to be cooled of the wall or of the cover or which forms a zone of the wall or of the cover. The cooling box, turned towards the interior (6) of the oven, contains a heat exchange plate (2) on which a plurality of nozzles (3) apply a cooling liquid. The heat exchange plate (2) consists of a composite sheet formed of a steel plate (8) on the side facing the interior (6) of the furnace and a copper layer (9) on the sprinkler side.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4103508 | 1991-02-06 | ||
DE4103508A DE4103508A1 (en) | 1991-02-06 | 1991-02-06 | METHOD AND DEVICE FOR COOLING VESSEL PARTS FOR CARRYING OUT PYRO METHODS, IN PARTICULAR METALLURGICAL TYPE |
PCT/EP1992/000177 WO1992014108A1 (en) | 1991-02-06 | 1992-01-28 | Device for cooling parts of the vessel of a furnace, especially a metallurgical furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0525136A1 true EP0525136A1 (en) | 1993-02-03 |
EP0525136B1 EP0525136B1 (en) | 1995-08-16 |
Family
ID=6424456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92903076A Expired - Lifetime EP0525136B1 (en) | 1991-02-06 | 1992-01-28 | Device for cooling parts of the vessel of a furnace, especially a metallurgical furnace |
Country Status (7)
Country | Link |
---|---|
US (1) | US5290016A (en) |
EP (1) | EP0525136B1 (en) |
AU (1) | AU652225B2 (en) |
BR (1) | BR9204119A (en) |
DE (2) | DE4103508A1 (en) |
ES (1) | ES2076025T3 (en) |
WO (1) | WO1992014108A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI93027C (en) * | 1993-02-26 | 1995-02-10 | Ahlstroem Oy | Method and apparatus for making iron |
ATA147194A (en) * | 1994-07-25 | 1997-11-15 | Voest Alpine Ind Anlagen | METHOD FOR COOLING A HOT SURFACE AND DEVICE FOR CARRYING OUT THE METHOD |
US5561685A (en) * | 1995-04-27 | 1996-10-01 | Ucar Carbon Technology Corporation | Modular spray cooled side-wall for electric arc furnaces |
US5853656A (en) * | 1997-07-08 | 1998-12-29 | Bethlehem Steel Corporation | Apparatus and method for cooling a basic oxygen furnace trunnion ring |
US6185242B1 (en) * | 2000-05-24 | 2001-02-06 | South Carolina Systems, Inc. | Integral side wall and tap hole cover for an eccentric bottom tap (EBT) electric furnace |
JP3842997B2 (en) * | 2001-11-14 | 2006-11-08 | 三菱重工業株式会社 | Refractory structure for water pipe protection and its construction method |
FR2844582B1 (en) * | 2002-09-16 | 2005-06-17 | H Raymond Guyomarc | REGULATOR COOLING SYSTEM FOR CONTROLLING WALL TEMPERATURES SUBJECT TO THERMAL PRODUCTION |
US7452499B2 (en) | 2004-10-29 | 2008-11-18 | Systems Spray-Cooled, Inc. | Furnace cooling system and method |
LU91142B1 (en) * | 2005-02-28 | 2006-08-29 | Wurth Paul Sa | Electric arc furnace |
KR101293060B1 (en) * | 2011-03-30 | 2013-08-05 | 현대제철 주식회사 | Roof for electric furnace |
US9464846B2 (en) | 2013-11-15 | 2016-10-11 | Nucor Corporation | Refractory delta cooling system |
US10598436B2 (en) | 2017-04-18 | 2020-03-24 | Systems Spray-Cooled, Inc. | Cooling system for a surface of a metallurgical furnace |
US10767931B2 (en) * | 2018-01-18 | 2020-09-08 | Systems Spray-Cooled, Inc. | Sidewall with buckstay for a metallurgical furnace |
US20190219333A1 (en) * | 2018-01-18 | 2019-07-18 | Systems Spray-Cooled, Inc | Furnace sidewall with slag retainers |
EP3824235A4 (en) | 2018-07-17 | 2022-04-20 | Systems Spray-Cooled, Inc. | Metallurgical furnace having an integrated off-gas hood |
US11175094B2 (en) | 2018-10-08 | 2021-11-16 | Systems Spray-Cooled, Inc. | Dynamic cooling of a metallurgical furnace |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US628790A (en) * | 1898-12-28 | 1899-07-11 | Ambrose Porter Gaines | Cooling device for furnace-walls. |
DE2127448C3 (en) * | 1970-06-04 | 1975-08-21 | Ishikawajima-Harima Jukogyo K.K., Tokio | Cooling element, in particular plate cooler, for blast furnaces |
DE2659827B1 (en) * | 1976-07-16 | 1978-04-20 | Fuchs Gerhard | Arc melting furnace |
DE2631982C2 (en) * | 1976-07-16 | 1982-05-06 | Fuchs, Gerhard, 7601 Willstätt | Arc melting furnace |
DE2817869C3 (en) * | 1978-04-24 | 1983-04-07 | Krupp Stahl Ag, 4630 Bochum | Lid for an electric arc furnace |
US4273949A (en) * | 1979-04-17 | 1981-06-16 | Fried. Krupp Huttenwerke Aktiengesellschaft | Arc furnace roof |
GB2064079A (en) * | 1979-11-30 | 1981-06-10 | British Steel Corp | Surface coated copper furnace components |
DE3027465C1 (en) * | 1980-07-19 | 1982-03-18 | Korf-Stahl Ag, 7570 Baden-Baden | Method and device for cooling vessel parts of a metallurgical furnace, in particular an arc furnace |
DE3027464C2 (en) * | 1980-07-19 | 1982-07-22 | Korf & Fuchs Systemtechnik GmbH, 7601 Willstätt | Method and device for cooling a wall area of a metallurgical furnace, in particular an electric arc furnace |
US4494594A (en) * | 1981-09-08 | 1985-01-22 | Amb Technology, Inc. | Spray cooling system for continuous steel casting machine |
CA1257473A (en) * | 1984-10-12 | 1989-07-18 | Willard Mcclintock | Furnace cooling system and method |
US4813055A (en) * | 1986-08-08 | 1989-03-14 | Union Carbide Corporation | Furnace cooling system and method |
US4815096A (en) * | 1988-03-08 | 1989-03-21 | Union Carbide Corporation | Cooling system and method for molten material handling vessels |
DE3820448A1 (en) * | 1988-06-16 | 1989-12-21 | Thyssen Edelstahlwerke Ag | Cooled wall element for metallurgical furnaces |
-
1991
- 1991-02-06 DE DE4103508A patent/DE4103508A1/en not_active Withdrawn
-
1992
- 1992-01-28 EP EP92903076A patent/EP0525136B1/en not_active Expired - Lifetime
- 1992-01-28 US US07/934,749 patent/US5290016A/en not_active Expired - Fee Related
- 1992-01-28 AU AU11761/92A patent/AU652225B2/en not_active Ceased
- 1992-01-28 WO PCT/EP1992/000177 patent/WO1992014108A1/en active IP Right Grant
- 1992-01-28 BR BR929204119A patent/BR9204119A/en not_active IP Right Cessation
- 1992-01-28 ES ES92903076T patent/ES2076025T3/en not_active Expired - Lifetime
- 1992-01-28 DE DE59203279T patent/DE59203279D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9214108A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2076025T3 (en) | 1995-10-16 |
US5290016A (en) | 1994-03-01 |
DE59203279D1 (en) | 1995-09-21 |
DE4103508A1 (en) | 1992-08-13 |
EP0525136B1 (en) | 1995-08-16 |
AU1176192A (en) | 1992-09-07 |
AU652225B2 (en) | 1994-08-18 |
WO1992014108A1 (en) | 1992-08-20 |
BR9204119A (en) | 1993-06-08 |
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