DD154310A1 - COOLING PLATE FOR ARC - Google Patents

Abstract

The present invention relates to a cooling plate for arc furnaces, either to form a melt located above the melt or to form a furnace cover, the inside and advantageously the outside of holding and anchoring devices for refractory material and also for the inlet and outlet nozzles for the cooling liquid consist, characterized by d. The fact that it can be cut from any desired thick sheet having a desired and preferred profile, wherein a coordinated plurality of channels substantially contained in the thickness of said sheet are obtained by machining with a tool and are desired by each, but preferably metallic material.

Description

Berlin, the 26. 3 " 1981 58 329/17

Cooling plate for electric arc furnace

 α Field of application of the invention

Subject of the present invention is a cooling plate for electric arc furnace, in particular a cooling plate, as used for cooling the upper arch of arc furnace or for cooling the cladding of such ovens.

Char akterist ik ".the bek t ann en te chni ch s s L s olution

There are some rings formed with housing elements within which the cooling water circulates. Of the same type is the funnel described in CH-PS 221 354, in which side walls and radiation part are made of a housing-like metal structure with circulating water therein.

The illustrated in DE-AS 263 19 82 closed circuit for cooling the upper arch of a furnace also has a housing-like structure, said according to this patent said element has a disposed on its inner surface refractory lining.

The French patent Ur ₀ 151 45 15 instead has two closed housing-like circles arranged one above the other to cool the upper vault of the furnace and a similar structure for cooling the Oferverkleidungo. In this patent, the housing-like elements are with the refractory linings by some anchoring devices connected and have in their hollow insides some tubes in which the cooling water circulates.

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DE-AS 265 93 27 shows two identical housing-like cooling rings, which are arranged one above the other * In this Pail said rings are made in segments, connected to each other, and have port sets, which protrude to increase the Wärmeübertragungsleistung- in the refractory lining.

The US-PS 382 95 95 (PR 73 * 02455) provides for the use of two superimposed rings, which are designed as segments with solid metal blocks and interconnected. Inside these blocks are some vertical 'pipes for the treatment of the cooling water shown. The aforementioned blocks have a refractory lining and. Fire brick lining on its inside «

DE-GM 761 66 08 represents an oven in which three cooling zones symmetrically ange- to the upper arch of the furnace ange-. are orders. Each zone comprises a plurality of metal cooling blocks, the _s ausgestattet_sind inside to Pührung of the cooling water with coils. The inner surface of this. Blocks are provided with metallic port sets, while the outer surface is covered by a metal plate which encloses the said cooling tubes.

A similar solution is shown in US Pat. No. 3,854,957, in which the zones selected for cooling are housing-like. equipped with water-cooled elements, or in which metal blocks on the inside are provided with fused inner tubes,

The patents US 374 37 52, US 377 70 43 and GB 119 35 27 also provide for the installation of housing-like cooling elements in such places'before the temperature is particularly high »

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Other rings consist of segmented cooling elements in which a cast iron block or copper block encloses a spiral channel with water circulating therein, as in US Pat. No. 3,841,306, after which the whole is obtained by casting and the spiral channel partially protruding and clings to the touching curvatures.

In other cases, said helical channel is neither enclosed in the refractory material, nor fused, nor on the cast iron block or copper block as in US Patent 384 31 06, but is provided, as in FR 873, inter alia, on the outside of the furnace and its lining However, said spiral channel can also be led around at the point of entry of electrodes around them, as in the patent FR 123.87 13 is the case. A further arrangement is shown in the patent FR 115 57 23, wherein an arc furnace consists of two coaxial panels and one of which is arranged inside the other and separated by a distance therefrom. The inner panel is cooled by gas flowing through the gap, while the outer panel is cooled by water entering the floor and exiting at the top. _O The circular cavity of the outer panel has some vertical channels that make up the furnace pass through virtually its entire length, said channels consisting of corrugated metal foil elements, which are fixed between the inner walls of said circular H-cavity ₀

In addition, there are other types of rings, all of which are complicated to manufacture and are not very reliable due to the thermal stresses to which they are subjected periodically and continuously,

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reduction of the service life of the refractory material and thus of the furnace itself »

The reduction in life increases the cost and time required to line the walls and the lining of the furnace. ·

Zigl_en r. Invention ·

The object of the present invention is a novel cooling plate intended for the construction of a refrigerating cycle or furnace lining in which ease of manufacture combines with a reliable structure capable of absorbing any thermal or mechanical shock. ,

Explanation of the essence of the invention

Object of the present invention is to provide a cooling plate, which can be made of a-commercial sheet metal of suitable thickness, said sheet must be easy to work with the aid of a tool, so that in its interior cooling ducts in one of these. Purpose sufficient amount can be formed.

Another object of the present invention is to provide a cooling plate having channels of cooling water included in the desired shape, the number and volume of which can be increased in the higher temperature zones, the cooling plate being manufactured at a low cost and easily failing at failure Means can be exchanged or readjusted «

According to the present invention, a plate of thick material is cut, which shape is also always preferred.

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Depending on the circumstances, the plate is bent before or after the successive operations. "A tool is used to produce a large number of internal channels, which are connected to one another via manifolds. As already stated, the plates are shaped according to the particular circumstances occurring and take on a partially cylindrical shape or a partially tapered, conical training before or after the further processing, or before or after closing the supply of the connecting pipes, if desired let the manifolds or feedthroughs at the ends or at an intermediate point by machining the exposed outer surface with a tool produce and then with a band or a foil 'sealed, which is sealed by welding to the plate. Thereafter, the supply and execution lugs are mounted in any desired and suitable position on the outer surface of the plate so that they correspond to the pipe manifolds.

The arc furnace cooling plate may be cut from any desired thick sheet having a desired and preferred profile, wherein a coordinated plurality of channels substantially in the thickness of said sheet are processed by machining. Tool is obtained and wherein the plate is brought into the desired shape and made of any desired, but preferably metallic, material.

The channels may be arranged in a desired shape and interconnected with at least some of the channels closed at their ends to form a closed loop.

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The closures can be welded, screwed or made by pressing in «

The manifolds are connected to at least one pipe, with at least a portion of the pipe manifolds being obtained from the exposed, exposed surface and having watertight closing elements.

At least a portion of the conduits are received from the exposed, exposed surface and have watertight closing elements.

The manifolds and pipes are arranged in the plate in the desired shape.

In the plate there is at least one link »

The entry and exit approaches are arranged in the desired shape. ':.

According to the present invention, the path of the circulating water can be varied widely within the limits imposed by the production of the channels by means of a tool, irrespective of whether this is done by drilling (for example with a straight-groove drill) or by milling or with the aid of a tool a shaping or cutting machine is made for example on a metal sheet.

An advantageous fact is that the plate of the present invention requires no additional casings and thus "a strong reduction in both the cost and the weight allowed A likewise advantageous fact fact is that the cooling channels in contrast to the through

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Cast manufactured panels, which require much larger minimum thicknesses, can be brought much closer to the surface. This also achieves greater cooling capacity and heat dissipation. Another advantageous fact is that the plate forms a more uniform and effective block for absorption of heat.

Another advantage of the present invention is the ability to provide a watertight cooling plate of resilient and homogeneous material without the risks of leakage in the cooling water circuit, with the further advantage of being able to install sufficient supports for the refractories.

The above purposes and advantages are achieved together with even more with a cooling plate, which is provided for the creation of a cooling ring or a furnace lining for electric arc furnace. Said plate can be connected to other, similar plates, so that you get the total required container and cooling device

The invention is therefore realized with a cold plate and used in electric arc furnace to obtain either an above-melt ring or a furnace cover. The inside of the plate may have some mounts and anchor devices for the refractory material, while the outside has attachments for the supply and exit of the cooling liquid. The plate is characterized in that it can be made of any desired thick sheet metal and cut to a desired and preferred profile, a

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coordinated plurality of channels substantially within the thickness of the sheet-called 'is included and is erkzeugs prepared by a Y / wherein said sheet is formed into the desired shape and of any desired, preferably metallic, material can consist ₀

Execution example

Hereinafter, a preferred embodiment of the invention will be illustrated by way of non-limiting examples with reference to the accompanying drawings. Show it

Fig. 1: a curved .Platter with substantially central entrance and exit approaches;

Fig. 2: a straightened, upright longitudinal section through the plate of Fig. 1;

Fig. 3; an upright cross-section through the plate of Figure 1 along the axis of -Ansatz; , "

4 shows an upright longitudinal section of a variant of the plate from FIG. 1;

5 shows an upright longitudinal section of a further variant of the plate from FIG. 1;

Fig. 6: an upright cross section through the plate

  from Fig. 5; ·; . ·.

Fig. 7 '· ' a plate for a furnace cover in section;

Fig. 8: a plate for a furnace cover with a bore in section;

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Pig »9: (a, b, c) a possible cut through the hole from Pig. 8th;

Fig. 10: a variant of the plate of Figo 7; Fig. 11: a variant of the plate of Fig. 8;

Fig. 12 shows the header of a manifold which is connected to and U; exposed outer surface and then sealed;

Fig. 14: schematically a possible installation.

From the drawing can be seen the following: (20) is generally a plate for the side part of a furnace, while (120) is a plate for the upper part _o The side plate is advantageously formed as a segment of the circumference, while the top plate is a section through the Oven cover corresponds. The top plate may contain some holes (for the entry of the electrodes, the escape of vapors, the addition of seed additives, etc.) which can be placed in the middle of the plate (as in the examples of Figures 8 and 11) or on the side or any other desired position, without limiting the objectives of the present invention. Thus, the side plate may have holes for the controls and accesses adapted to the applications and requirements _o (21) and (22) are the corresponding upper and lower sides, the said sides, as well as the lateral parts (27), being particular Profiles (23) is the inner surface and may consist of some suitable devices (28) of any desired shape and type which enhance and facilitate the installation of the refractory material can _o (24) represents the

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External surface of which advantageously the connection tubes or attachments (25) and (26) for connection of the feed or attachments (25) and (26) for connection of the supply or discharge of the cooling liquid protrude, (25) and (26) the inlets and outlets, "or vice versa, which are respectively provided for the supply or discharge of the cooling liquid used" (28) are the anchors or anchor devices intended to facilitate the installation and maintenance of the refractory material Said anchor devices can be welded, screwed or inserted into corresponding bores which are fastened there, for example with nuts on the side (24). (29) (129) - (229) are channels which act as an upper manifold · act "(30) - (130) - (230) are channels which act as a lower manifold (the definition of the lower and upper manifold is given here for purposes of illustration only.) (31) and (131) are possible routes for connection of one or both approaches with the channels (29) and (30), which act as Rohrvert'eiler _e (32) are lines that carry the coolant coming from the manifolds "(33) are closures that be provided at the ends, the sides and possibly at the end faces to give water-impermeable seals by the channels (29), (30) and (32) are blocked. The closures (33) can be screwed, welded or pressurized and may interact with water impermeable seals. (34) are inner plugs, which are used, for example, in the manifolds, to divide them into sections and to modify the circulation of the liquid in the desired manner; »

(35) is the exposed surface-produced and then sealed cover of the channel ₀ called the cover

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can be completely or partially embedded or attached to the outside. (36) is a possible hole in the plates' and serves a variety of purposes and can have a variety of shapes and profiles.It may be in any desired position of the plate and, for example, also in the middle, at an intermediate position or in may be provided near the edges, or may be machined into the edges to conform to the adjacent plate, (37) is the circular manifold which, as shown in Figs. 9a, 9b, and 9c, is most diverse (38) is the closure for the channel (37) and is designed so that the cooling liquid can circulate around the bore (36) without spilling out, (39) is the shaft of the arc furnace, (40) and (41) examples of dispensing operations, while (42) represent examples of exit devices, but both can be exchanged _o the said outer pipe distributors ( 41) and (42) are shown connected in a ring; but can be combined differently if desired.

The operation is obvious. The liquid enters through (25) or (26) and reemerges through (26) or (25) after having passed the manifolds (29) and (30), the conduit (32), and possibly the Has passed routes (31) and (131) «

The method of making the plates (20-120) is similarly obvious, and the course of the illustrated manufacturing stages may vary, and one sooner or later than the other, depending on the tools used.

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After a section through the circumference of the plate (20) - (120), the steps required for the desired geometrical shapes to produce the channels (29), (30) and (32), eventually (37),.

Said channels can be wholly or partly made up with a drill and a cutting bit (for example with a straight-bore drill for long holes), or with a milling cutter, or a turning tool (as in the case of the channels' (37) of FIG »9a and -9b) or again with. Help a forming (or cutting) machine for the plate.

The closures (33) or covers (35) - (38) are then fastened in the desired manner, e.g. B ₀ by welding, screwing, pressing, etc. _E

f

Fig. 5 shows the case of a plate in which a top channel is obtained by milling (shown as an example for a non-continuous channel), while the other channel (129) is used to connect the various lines (32) and eventually (31) is used without the said lines thereafter being closed as in the ¹ examples of Fig. 4 or in other solutions,.

The lines (32) can obviously be arranged horizontally or vertically · or follow any desired slope.

Fig. 7 shows an example in which the manifold (30) 'was designed from the outset as a non-continuous channel and the conduits (32) are also non-penetrating channels. In addition, FIG. 7 shows a line 32 produced by milling, for example.

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The leads (32) may extend in any desired direction in the plate (120)

Pig. Figure 9 shows some possible types of well mouths for both the cooling of the electrode rim and the connection of the third or fourth bore.

We have hereby described a few variants, although others are possible for a person familiar with the art, as it is also possible to introduce integrating and / or replacing modifications or variants, without departing from the essence of the solution ο

Thus, the proportions and / or dimensions can be changed and other gradients realized. "It is possible to make the channels exclusively or partially by drilling and partly by machining the exposed surface and then closing them, with all channels also on the exposed, exposed one surface is manufactured, and then can be closed ₀ 1st Generally it possible the manifold (29) - (30) horizontal, mostly horizontal, vertical or predominantly vertical, or to arrange in any desired direction. It is possible to let the pipes (32) hit the pipe manifolds (29) - (30) at any desired angle. The entire run can consist of a single line, etc.

Claims (3)

58 329/17 -H- Erfindung.sanspruch A cooling plate for electric arc furnace, either for forming a ring above the melt or for forming a furnace cover, the inside and preferably the outside having refractory retaining and anchoring means and also cooling liquid inlet and outlet means, characterized in that it can yjerden cut from any desired thick sheet with a desired and preferred profile (21 - 22 - _-27)} where a coordinated .Vielzahl of channels (29 - 30 32 - 37) substantially contained in the thickness of the said plate are obtained by machining with a tool and wherein the plate is brought into the desired shape and consists of any desired, but preferably metallic, material » 2o Cold plate for arc furnace according to 'Item 1, marked • net in that the channels (29 - 30 - 32 - 37) in a. , 3 orm 3 are arranged and interconnected, whereby at least some of the channels are closed at their ends (33) and thus closed. •. forming a circle _c 3 cooling plate for electric arc furnace according to the points 1 and 2, characterized in that the closures (33) are welded * Cooling plate for electric arc furnace according to items 1 and 2, characterized in that the closures (33) are screwed o. , " 5ο cooling plate for electric arc furnace according to the points 1 and 2, characterized in that the closures. (33) below 2 25 1 β ^ _1Γ 58 329/17 - I J) - Pressure in their position. 6 "cooling plate for electric arc furnace according to item 1 and points 2 to 5, characterized in that the pipe manifolds (29-30-30) are connected to at least one line (32) ₀ Cooling plate for electric arc furnace according to items 1 to 6, characterized in that at least a part of the manifolds (29 - 30 - 37) is obtained from the exposed, exposed surface and has watertight closing elements (35 - 38). , - 8 'cooling plate for electric arc furnace according to item 1 to 7, characterized in that at least a part of the lines (32) from the open, exposed surface is obtained and waterproof closing elements up has (35 - 38). . 9. cooling plate for electric arc furnace according to item 1 to 8, characterized in that the pipe manifold (29 - 30 - 37) and lines (32) in the plate (20 - 120) are arranged in the desired shape. 10. cooling plate for electric arc furnace according to point .1 to 9> characterized in that there is at least one connecting path (31 - 131) in the plate (20 - 120). 11. cooling plate for electric arc furnace according to item 1 to 10, characterized in that the inlet and outlet approaches (25 - 26) are arranged in the desired shape » 7? I H \ Psfi * f £ .11 ^v - «i Ovslwi