EP2847531A1 - Seitenwandkühlung für schmelzöfen - Google Patents
Seitenwandkühlung für schmelzöfenInfo
- Publication number
- EP2847531A1 EP2847531A1 EP13720968.0A EP13720968A EP2847531A1 EP 2847531 A1 EP2847531 A1 EP 2847531A1 EP 13720968 A EP13720968 A EP 13720968A EP 2847531 A1 EP2847531 A1 EP 2847531A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lining
- slots
- metal plate
- copper plates
- cooling
- 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
-
- 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
- C21C5/4646—Cooling arrangements
-
- 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; Electric arc furnaces ; Tank furnaces
- F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
Definitions
- the present invention relates to a device for cooling a metal melting furnace, in particular a reduction furnace.
- Melting furnaces in particular reduction furnaces, contain hot metal melts covered by a slag layer.
- This slag layer is often very aggressive and can degrade the wall lining of the furnace.
- the furnace vessel in the interior comprises a lining, which is in direct contact with the melt or slag.
- the inner wall of the furnace must be constantly cooled.
- On the outside of the lining is often a metal armor, which is cooled, for example, with an open trickle cooling. In this case, large amounts of water are needed, which also run partly uncontrolled.
- Another disadvantage is that, in the case of cracks in the armor, water can enter the lining or melt or slag, which can cause undesirable and dangerous chemical reactions.
- water boxes are mounted on a side of the armor facing away from the melt and flooded with water.
- a cooling element for cooling a metallurgical furnace wherein the furnace shell of the furnace is delivered to its furnace interior facing side with refractory material.
- the cooling element comprises a cooling part through which a coolant flows and which has a coolant inlet and a coolant outlet, as well as a heat section cooled by heat conduction.
- the hot part of the cooling element in the installed state is flush with the front side of the refractory material pointing into the interior of the furnace.
- the entire hot part is formed as a plate and this plate is cold side associated with a separate cooling part.
- European Patent EP 0 741 853 B1 discloses a cooling device for a furnace, wherein rod-like copper rods extend into a furnace wall.
- a metal plate On the back of the furnace wall is, for example, a metal plate, which is cooled over a large area by a water tank.
- a disadvantage of the disclosed arrangement is first the complex and costly production of the disclosed system. Furthermore, when using a continuous copper plate as adjacent to the furnace wall back wall, extending from this plate copper rods, large amounts of copper are needed. In addition, the carrying capacity of copper is limited, so that large material thicknesses are needed to achieve the necessary stability. Finally, a lining between the copper rods is considerably more difficult.
- the technical object of the present invention is to provide a further developed cooling device for a melting furnace, in particular for cooling the slag region of the furnace - not the molten metal bath underneath.
- such a device should be safe, enable a good cooling performance and / or be inexpensive to produce.
- such a device should also be used for rotary kilns.
- Another object may be to overcome at least one of the above disadvantages.
- the present invention relates to a cooling device for a melting furnace, in particular for cooling a liquid slag in a reduction furnace.
- the device comprises a lining for (side) shielding of a liquid molten metal bath and a molten slag located on the molten metal, and a metal plate (or a metal armor, in particular a steel plate), which on one side of the lining opposite the molten metal bath and the slag is arranged.
- the metal plate comprises a plurality of substantially vertically aligned and (in a horizontal direction) juxtaposed slots, wherein at least one, preferably each of the slots each one of the copper plates extends substantially perpendicular to the metal plate in the lining and the device further with Includes coolant through ström bare cooling channels, which are each arranged between two juxtaposed slots and extending through these slots copper plates on the side remote from the molten metal bath and the slag side of the metal plate.
- the copper plates extend into the lining, on the other hand, a cost-effective and effective cooling of the areas between the copper plates is possible.
- the revealed device can also be used in rotary kilns, for which a production of copper elements for cooling a brick lining is often difficult.
- the demand for copper can be kept low in view of rising commodity prices.
- the metal plate may be formed of steel or a steel alloy, whereby a high stability as well as a cost saving is made possible.
- the invention is particularly advantageous in the case of aggressive slag baths, in which it is of great importance that the liquid slag solidifies or "freezes" on the lining or on the copper plates.
- the slag layer thus formed can significantly reduce wear on the lining and / or copper plates.
- the inventive concept allows a high stability of the furnace vessel, since a sufficient area of the metal plate remains between the slots through which the copper plates are introduced into the lining.
- the spacing of the slots arranged side by side corresponds to 1 to 8 times, preferably 2 to 6 times the width of the slots, the thickness of the copper plates preferably being at least 70%, preferably at least 90% Width of the slots corresponds.
- the cooling channels arranged on the metal plate extend at least over a range of a vertical length of 80% of the vertical length or extent of the copper plates, preferably over 100% of this length or preferably even over more than 100% of this length ,
- the cooling channels extend between two juxtaposed slots (in horizontal direction) over a range of 40% -100%, preferably 50% -90% of the (horizontally considered) distance between two adjacent slots.
- the copper plates extend (substantially perpendicular to the metal plate and / or at the location of the corresponding slot) over more than 40% of the thickness of the lining in the lining or preferably extend substantially over the entire thickness of the lining.
- the copper plates are in direct or direct contact with the lining.
- at least 50%, preferably at least 75%, of the surface area of the plates is in contact with the lining. This feature also serves to further improve the cooling performance.
- the copper plates also comprise channels through which coolant can flow, which channels are preferably arranged in an end region of the copper plates facing away from the molten metal bath and the slag.
- the heat dissipation can be increased by the copper plates.
- the lining has a thickness of 400 mm to 800 mm and preferably a thickness of 450 mm to 650 mm.
- both the lining and the steel plate adjoining the lining are each substantially hollow-cylindrical, so that the hollow-cylindrical lining forms a space for enclosing the molten metal bath and the slag thereon laterally.
- the rotational symmetry axis of the hollow cylinder is preferably in the vertical direction or can also be described as its longitudinal axis.
- the circumferential direction of the hollow cylinder is preferably in a plane perpendicular to the axis of rotational symmetry.
- both the lining and the metal plate each form side walls of a polygonal (especially rectangular) box.
- the invention is also directed to a furnace, preferably a reduction furnace, which comprises a cooling device according to one of the preceding embodiments.
- the oven may preferably be designed as a round oven. That is, the volume formed by the lining and the metal shell or the metal shell for forming a molten metal in a horizontally extending cross-section is substantially round (circular).
- the cooling device forms a lateral boundary of a furnace vessel for receiving a molten metal bath and a liquid slag above it, wherein the copper plates extend in the vertical direction at most over the height of the slag bath. In other words, the copper plates (in the vertical direction) do not extend over an area in which the Molten metal is located.
- This area of the lining is preferably free of copper plates.
- the present invention is also directed to a method for producing a melting furnace or cooling device for such, preferably a furnace or a device according to one of the preceding embodiments.
- the method comprises at least one of the following steps: provision of a substantially hollow cylindrical metal plate with slots arranged adjacent to each other in the circumferential direction of the metal plate, which each extend perpendicular to the circumferential direction; hollow cylindrical walling of the inner wall of the hollow cylindrical metal plate; and inserting a copper plate into the slots, respectively.
- the steps can also be performed in a different order.
- the term metal plate or metal armor should not be understood as limiting that it must be a one-piece component.
- the metal plate may also consist of several butt welded together elements.
- this further comprises the step of providing cooling channels on the outer wall of the hollow cylindrical metal plate in an area between the adjacent slots (on the side facing away from the melt or slag side of the metal plate).
- the lining takes place in such a way that the copper plates introduced through the slots contact the lining.
- the copper plates extend at least over 50% of the thickness of the lining.
- the cooling channels may be generally perpendicular to the circumferential direction of the hollow cylindrical metal plate extend over at least a range of 80% of the same direction extending length of the slots.
- Figure 1 is a schematic side view of an outer wall of a
- FIG. 2 shows a schematic, horizontal partial cross section of a cooling device or a furnace according to the invention
- FIG. 3 shows a schematic, vertical partial cross section of a cooling device or a furnace according to the invention.
- FIG. 4 shows a schematic, vertical partial cross section of a further cooling device or furnace according to the invention
- FIG. 1 shows a side view of an exemplary embodiment of a cooling device according to the invention.
- two copper plates 7 are shown extending substantially perpendicularly to a metal plate or armor 5 (in particular of steel or a steel alloy), which protrude through (longitudinal) slots 13 of the metal plate 5 therethrough.
- each copper plate 7 is attached by fastening means 15 to the metal plate 5 directly or indirectly.
- the metal plate 5 extends substantially in a vertical direction V. Such a direction may be substantially perpendicular to the melting or slag level of a molten metal M or slag S in a melting furnace.
- the copper plates 7 are preferably provided with cooling channels 11 (not shown in FIG.
- a coolant may, for example, include water but also be formed by other liquids.
- a coolant may, for example, include water but also be formed by other liquids.
- Behind the illustrated view of the metal plate 5 is a lining 3, which is in contact with a melt and / or slag S (not shown).
- These channels 9 may include, for example, metal chambers which are welded to the metal plate 5 or sealingly screwed or riveted thereto.
- the channels 9 may extend substantially parallel to the copper plates 7 and / or be arranged meandering between the copper plates 7.
- the channels 9 can be supplied with coolant.
- the cooling channels 9 preferably extend over a majority of the distance A between two adjacent (but spaced apart) copper plates 7.
- the channels also extend at least over half the height (in the vertical direction) of the copper plates 7 or slots 13 or even, as shown, over more than the height of the copper plates 7 or the slots 13.
- copper material can be saved by the arrangement shown on the one hand, but on the other hand, an efficient cooling possible.
- the copper plates 7 may generally be made of any copper alloy.
- FIG. 2 shows a partial cross-sectional view of an arrangement similar to FIG. 1 in the horizontal direction H.
- the copper plates 7 extend in the cross-sectional view, finger-like into the lining 3, which is in contact with the slag S or melt M.
- the metal plate 5 and the lining 3 may have a curved shape.
- the lining 3 and the metal plate 5, a lateral boundary for a molten metal M or slag S a round furnace, z. B. a reduction furnace.
- the metal plate 5 and / or the lining 5 is formed as a hollow cylinder.
- the copper plates 7 extend from the slag S opposite side (rear side) of the metal plate 5 through the metal plate into the lining 3.
- the lining 3 contacts the copper plates 7
- Fixing the copper plates 7 may comprise angle elements or console elements, which protrude substantially perpendicularly from the metal plate 5 on both sides of a copper plate 7, wherein the copper plate 7 is preferably secured by bolts or screws to these elements.
- the copper plates 7 preferably comprise cooling channels or holes 11. These can be arranged to improve the reliability in a region of the copper plates 7, which does not protrude into the lining 3 or is located on a remote from the melt M or slag S side of the metal plate 5.
- the lining 3 and / or the metal plate 5 may each be integrally formed or composed of several elements.
- the metal plate 5 may for example consist of a plurality of welded, riveted or bolted (plate-like) elements.
- the assembly of several elements may be particularly advantageous for large furnace diameters in the order of up to 25 m.
- the lining 3 may be bricked or cast, as is conventional in the art.
- a heat-conducting layer in particular a carbon-containing heat-conducting layer, can generally be present between the lining 3 and the metal plate 5. This can be for example one Thickness of several centimeters. However, such layers are familiar to the person skilled in the art.
- FIG. 3 shows a schematic partial cross-section in the vertical direction V.
- the lining 3 the metal plate 5 lying behind or on a side of the lining 3 facing away from the slag S or melt M, and a copper plate 7 projecting into the lining 3 through an opening 13 in the metal plate 5 are shown.
- the copper plate 7 preferably extends over at least half the thickness of the lining 3, whereby an effective cooling or heat dissipation is made possible.
- the copper plate 7 preferably extends over only a region of the slag bath S in the vertical direction V, not over the region of the molten metal bath M.
- FIG. 4 shows a schematic partial cross section of a cooling device or a furnace in the vertical direction V, but with the difference that the copper plate 7 extends through or over the entire thickness of the lining 3 in order to further improve the heat dissipation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012207934 | 2012-05-11 | ||
| DE102012214147A DE102012214147A1 (de) | 2012-05-11 | 2012-08-09 | Seitenwandkühlung für Schmelzöfen |
| PCT/EP2013/059627 WO2013167677A1 (de) | 2012-05-11 | 2013-05-08 | Seitenwandkühlung für schmelzöfen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2847531A1 true EP2847531A1 (de) | 2015-03-18 |
| EP2847531B1 EP2847531B1 (de) | 2016-01-13 |
Family
ID=49475592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13720968.0A Active EP2847531B1 (de) | 2012-05-11 | 2013-05-08 | Seitenwandkühlungsvorrichtung für schmelzöfen |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2847531B1 (de) |
| CA (1) | CA2874076C (de) |
| DE (1) | DE102012214147A1 (de) |
| WO (1) | WO2013167677A1 (de) |
| ZA (1) | ZA201408198B (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS496443B1 (de) * | 1970-07-04 | 1974-02-14 | ||
| AUPM393094A0 (en) | 1994-02-16 | 1994-03-10 | University Of Melbourne, The | Internal refractory cooler |
| DE10119034A1 (de) | 2001-04-18 | 2002-10-24 | Sms Demag Ag | Kühlelement zur Kühlung eines metallurgischen Ofens |
-
2012
- 2012-08-09 DE DE102012214147A patent/DE102012214147A1/de not_active Withdrawn
-
2013
- 2013-05-08 CA CA2874076A patent/CA2874076C/en active Active
- 2013-05-08 WO PCT/EP2013/059627 patent/WO2013167677A1/de not_active Ceased
- 2013-05-08 EP EP13720968.0A patent/EP2847531B1/de active Active
-
2014
- 2014-11-10 ZA ZA2014/08198A patent/ZA201408198B/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013167677A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2847531B1 (de) | 2016-01-13 |
| DE102012214147A1 (de) | 2013-11-14 |
| WO2013167677A1 (de) | 2013-11-14 |
| CA2874076C (en) | 2016-08-30 |
| ZA201408198B (en) | 2015-11-25 |
| CA2874076A1 (en) | 2013-11-14 |
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