CN1180159A - Furnace vessel for DC arc furnace - Google Patents
Furnace vessel for DC arc furnace Download PDFInfo
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- CN1180159A CN1180159A CN 95113127 CN95113127A CN1180159A CN 1180159 A CN1180159 A CN 1180159A CN 95113127 CN95113127 CN 95113127 CN 95113127 A CN95113127 A CN 95113127A CN 1180159 A CN1180159 A CN 1180159A
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- wall section
- balance plate
- electric arc
- direct current
- furnace
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Abstract
The furnace vessel for a DC arc furnace has a thermostable wall which preferably consists, in the region situated above the slag line (S), of a plurality of water-cooled wall segments (1) made from steel. These wall segments are fastened to a support structure (13-18). At least one of the wall segments (3) consists of nonmagnetic steel or copper and is preferably arranged on the side of the furnace vessel (5) opposite the power supply device (7). In this way, the influence of the high-current lines which extend below or beside the furnace vessel and cause a deflection of the arc can be compensated. The effect of this nonmagnetic wall segment can be partially or virtually entirely cancelled by a trimming plate (19) which is detachably fastened from the outside to the nonmagnetic wall segment (3), in order in this way to achieve optimum trimming of the deflection of the arc.
Description
The invention relates to the direct current electric arc furnace with heat-resisting furnace wall and steel stove outer covering and hearth electrode and consumable electrode, above-mentioned electrode is by being powered by big current feed line at the power-supply device in the body of heater outside.
By undated Fa.ABB Process Automation Ltd, CH-5401 Baden/Switgerland " Arc Furnaces ", company's file, particularly the 9th page of left figure in top discloses this class body of heater.
The metal molten stove all is steel constructions usually, for the high temperature in the reaistance furnace, is provided with the furnace lining that refractory material constitutes in the melting range.Stove outer covering is made up of water-cooled wall section (also claiming coldplate) on fusion zone (slag line), makes desired part avoid the infringement of heat effect.
Disclose this metalloid melting furnace in company's file " Arc Furnaces " of aforementioned list or DE-2745622 C2, the above zone of the slag line of furnace wall is made of coldplate, and this coldplate is made of steel pipe.In the stove in company's file, above-mentioned pipe each other from a distance, and the distance between the pipe is filled with bonding jumper, in the stove in DE-2745622C2, wallboard is to be made of the cooling worm that the side sky that nestles up arrangement is opened.In the middle of these two examples, they are all fixed against a supporting walls that constitutes as wooden partition or skeleton.
Shown at new high power DC electric arc furnaces itself, electric arc is more or less to side deflection, and such deflection is owing to the magnetic field that is subjected to around high-current conductor is caused, and has the very strong loss furnace wall and the consequence of bell.Asymmetric Energy distribution in stove has caused additional energy loss.
Up to the present, adopt two kinds of countermeasures to overcome the lateral deflection of electric arc substantially:
-electrode (EP-0 158 937 B1) is set prejudicially deviating from the direction of deflection;
-on a higher plane, big current feed line is set around table, only just guide line (EP-0518070A1) from power supply downwards than the distally to hearth electrode at body of heater.
For these two measures, all can prove the effect of influential arc deflection.In fact being provided with of the off-centre of Shi Xianing is not sufficient to prove itself, can eliminate deflection reliably fully, in contrast, there is purpose that the measure that big current feed line can prove abundant effect is set, but it also has shortcoming, the effect of this measure itself is difficult to be determined in advance, because all must take at other all things of stove with when being in the magnetic part of laying the place and their magnetic saturation degree in calculating.
Practice shows, big current feed line is set specially might causes the danger excessive to deflection correction: seek may cause deflection round about to the compensation of arc deflection, this problem that can only cause getting in touch with deflection moves on to an other zone of furnace interior.
Though people recomputate big current feed wire system considering such danger, change structure or reconstruction, yet can not guarantee deflection is removed subsequently, for this, reconstruct not only costliness but also time-consuming of big current feed wire system.And stove must be out of service in the regular hour.If can find a solution to specific heat size and electrode current by this way, but this solution is not certain being suitable for for the power of another heat size and/or stove.
Task of the present invention is, a kind of technical scheme of direct current electric arc furnace is provided, and this scheme can realize the balance of deflection correction, do not closing stove or do not reconstructing under the situation of stove and just can realize, and all applicable to all heat sizes and power.
According to the present invention, this task is solved by following measure, and promptly the furnace wall part of stove outer covering is to be made of nonmagnetic substance, particularly nonmagnetic steel or copper at least, and the part of this furnace body wall preferably is arranged on the relative side with power supply of stove.
The present invention has at first realized the advantageous structure of stove, and the scope of this stove more than slag line is made up of a large amount of water-cooled wall section of steel, and this wall section is fixed by supporting structure.
The present invention is based on following knowledge:
The DC current that flows by electrode produces magnetic field around electrode.At the electrode of endless with do not have magnetic element ideally
B=μ
oIn the I/2 π r formula, B=is the magnetic field of unit with the tesla, and I is to be the electric current that passes through electrode of unit with the ampere, and r is the distance with the distance electrode longitudinal axis of rice calculating, μ
oBe a constant (4 π 10
-7).In practice, electrode length is limited, and this has caused the minimizing in magnetic field.Magnetic element in the non-magnetic field of electrode, just the furnace wall has caused the distribution of calculating magnetic field simply.Particularly the influence of the big current feed line of putting in the stove underneath in action.
By those replacements one or more (common) magnetic wall section by nonmagnetic substance, so just being created in the magnetomotive of these sections concentrates, by like this by electric current flow through magnetic field that electrode produces around distribution can be represented the magnetic force line cutting electric arc in window magnetic field in the electrode scope by an additional magnetic field (window magnetic field).Produce a power that affacts on the electric arc like this, this power is pointed to the direction that deviates from non magnetic wall section.By this way, below body of heater or extend on the next door and can be corrected further from the influence that power-supply device is guided the big current feed line of hearth electrode into.
Because the single wall section that is made of nonmagnetic substance of having built may form the overcompensation of deflection, further formation of the present invention is, the compensating action of the influence in window magnetic field is weakened by following way, hidden even nonmagnetic wall section partly can be used on its outside balance plate of being made by magnetic material that uses at the most.This balance plate can directly be placed on the non magnetic wall section with inappreciable distance, in this way " normally " wallboard overlaid that this balance plate can be contiguous with one or polylith.This balance plate also can with the placement of nonmagnetic wall Duan Youyi segment distance, for example in the outside of the supporting structure of wall section, this balance plate also can be divided into the part that maybe can build that can assemble simply.A particularly advantageous remodeling can be, balance plate constitutes them by two parts and can move each other, this two and half plate is approximate more or less, or two half plate portion ground can be moved and cross adjacent " common " wall section, use such method that the surface area of effective balance plate is changed simply.The possibility of an other variation is, changes the distance between balance plate and the non magnetic wall section.If balance plate moves away from body of heater to the outside, the compensating action of deflection is as by force.Balance plate moves inward compensating action is died down, if non magnetic wall section fully and is not covered by a balance plate to distance, balancing force can be reduced to zero.
Because this generic operation do not need blowing out just can carry out, the operation that has therefore realized being observed by operating personnel stove for the first time is the deflection of electric arc and the deflection that wear-resistant measure changes balance electric arc into, till reaching desirable arc deflection and compensating.When using the polylith balance plate, such operation in addition simply mode realized with remote control.
In practice, people can further develop, and people can produce overcompensation by non magnetic wall section intentionally when beginning, so as to reaching the Distribution of Magnetic Field that can reach a best by said balance plate.
Further advantage of the present invention is, any have a stove segmentation and upper of furnace body structure that be equipped with non magnetic wallboard and bascule and all can ressemble because the latter with new wall section of packing into again common apparatus become a unit.
Inventive embodiment and can reach further advantage thus and will be described in detail by means of accompanying drawing.
In the accompanying drawings, except the sketch of explaining invention, also at length showed inventive embodiment.
Fig. 1 provided have body of heater, consumable electrode, power supply and connect direct-current arc furnace apparatus to the big current feed line of consumable electrode and hearth electrode by power supply.
Fig. 2 has provided one embodiment of the present of invention, and it is the profilograph by the furnace wall of the direct current electric arc furnace that has from the outside partly a non magnetic wall section that is covered by balance plate.
Fig. 3 has provided along the profile of the wall section of the AA line of Fig. 2.
Fig. 4 has provided second embodiment of the present invention, and it is by having from the outside the profilograph of furnace wall of direct current electric arc furnace that is partly hidden the non magnetic wall section of (and balance plate is fixed by carrying bolt) by a balance plate.
Fig. 5 has provided along the profile of the wall section of BB line among Fig. 4.
Fig. 6 has provided the 3rd embodiment of the present invention, and it is the vertical profile section by the furnace wall with the direct current electric arc furnace that is equipped with a non magnetic wall section that is divided into the two balance plates that can move mutually between two balance plates.
Fig. 7 has provided along the vertical section of the wall section of CC line among Fig. 6.
In the very big direct-current arc furnace apparatus of having simplified that Fig. 1 provides, the 1st, body of heater, the 2nd, consumable electrode, this consumable electrode is placed on the electrode supporting arm 6, the 7th, the power-supply device of placing on boiler tube body next door, big current feed line 8-connects consumable electrode 2, and another big current feed line 8+ links stove low electrode 9.Body of heater itself comprises furnace bottom U, stove top O and bell D.Stove top O on slag line S is that the water-cooling wall section by steel constitutes, consider the connection of building structure, fixing and cooling fluid, these walls Duan Junyu the 9th page of aforementioned company file at the figure on top or corresponding in the wall section that Fig. 1 and Fig. 2 described and illustrated of DE-2745622 C2.
According to the present invention, in the part of furnace wall, the furnace wall on stove top, the furnace wall part that normally is arranged on power-supply device 7 opposites is made up of nonmagnetic steel or one or more wall section made of copper.
The pipeline 10 that constitutes by nonmagnetic steel that this wall section is included in that horizontal direction extends, these pipelines for example be not one against a ground but (in vertical direction) stand away mutually, and use by the bonding jumper made from the same material of pipeline 10 and be connected between mutually, for example welding, the gap 12 that stays between the pipeline 10 is filled with refractory material 3 before the wall section 3 of packing into or after also having.This is suitable for the space between the adjacent wall section too.This wall section 3 is kept by the supporting structure of a frame configuration, from wherein, for example manages 13,14,15 and 16 infeeding and discharging as cooling liquid.The part of supporting structure be one in order to the wall section being leaned against the supporting angle steel 17 of (not shown) stove bottom, and support plate 18 is as the placement plane of (be provided with equally and illustrate) bell.Up to the present, the structure of wall section is except managing 10 material and bonding jumper 11, all corresponding with prior art.
Describe in detail as top, by the wall section of packing into and becoming by nonmagnetic substance, particularly nonmagnetic steel or copper, can apply substantial influence to the deflection of electric arc, construction situation according to section, this not only wall section constituted in the mode of describing, and can use said material to build two or more adjacent wall section.Preferably carry out like this, promptly from beginning just expectation arc offset is carried out overcompensation, adjusting that can be in addition trickle then according to operating experience.
Come on one or more nonmagnetic wall section 3 and implement fine control by loading onto one or more balance plates 19 or 20a and 20b from the outside according to the present invention.
In first embodiment, as it shown in Fig. 2 and Fig. 3, in order to reduce the effect of the wall section 3 that constitutes by nonmagnetic substance, a balance plate 19 directly is fixed on removably the outside of non magnetic wall section, at pipe 10 and intermediate plate 20 that is made of nonmagnetic substance of installation above the bonding jumper 11, this intermediate plate 20 is provided with the clamping plate 21 that outwards meet at right angles and extend again for this purpose.These clamping plate have a hole, insert a pin 22 by this hole.Balance plate 19 has a breach 23, so that balance plate 19 can move on clamping plate 21 and be fixed by means of pin 22.The wall thickness d of balance plate should so choose, and makes that its thickness should be the twice of the W of pipe 10 wall thickness at least.
Only be provided with a balance plate 19 for wall section 3 in Fig. 2 and 3, this plate has for example approximately covered a half section area.Self-evident, can be placed on another piece balance plate in the space between pipe 13 and the support angle 17 and and be fixed on the there in the same way.Equally, balance plate 19 can be on tangential direction again the part of segmentation and these segmentations can distinguish and fix so that can realize influencing according to operating experience to the best of electric arc.
Replace in fact being placed in one or more balance plate on the outer wall of wall section, can use the balance plate 19 of an independent whole outer surface that in fact can cover the wall section.In Figure 4 and 5, schematically provided this possibility as an example.
By means of threaded bolt 24 balance plate 19 is fixed on the nonmagnetic wall section 3 there, the wall thickness d of balance plate so chooses once more, makes that it is the twice of pipe 10 wall thickness at least.Carrying bolt 24 is fixed on the Bolt plate 25, and Bolt plate itself is to be welded on the outer wall of wall section 3.
Determine balanced action according to balance plate 19 from the distance of wall section 3 (pipe 10), thereby this distance should be adjustable, unscrew hold-down nut 26 later on screw thread carrying bolt 24 shifting balance plate 19 can realize the variation of this distance and be fixed then.Also can not use carrying bolt and nut and use and be fixed on the variation (not shown in the Figure 4 and 5) that the bolt of grabbing in telescopic on the balance plate 19 and pipe are realized distance.Also can realize in this embodiment fix and mobile to the further segmentation of balance plate 19 with to the plate of segmentation is separated.
In the middle of the 3rd embodiment of the present invention, shown in Fig. 6 and 7, balance plate can be subdivided among two part 20a roughly onesize, that made by (common) magnetic material and 20b and other embodiment the same, the wall thickness d of half sheet balance plate 20a, 20b is so chosen, make it be at least the twice of the wall thickness w of pipe 10, the bottom of balance plate is placed on the carriage 27 that is provided with a groove 28, its upper end is held device 29 and fixes, this clamper is fixed on the pipe 14 of supporting construction, and this clamper is provided with a groove or slit 30 equally.Two and half sheet balance plate 20a can move and move relative to wall section 3 in tangential direction mutually with 20b by this way.Covered nonmagnetic wallboard 3 fully at state (shown in the chain-dotted line among Fig. 7) the two and half sheet balance plate 20a and the 20b that shift one onto.Can realize balance by mobile a slice on tangential direction or two and half sheet balance plates.Be exactly mobile outside plate end or two outside plate ends on " common " wall section like this.When they itself during only against nonmagnetic wall section 3, they are not exerted one's influence from the viewpoint of magnetics.This variation scheme is particularly suitable for the remote control balance, for example control between in take the shifting balance plate by electronic, pneumatic or hydraulic pressure.
Equally, in according to the embodiment of Fig. 6 and Fig. 7, can take some to change, and the scope of not leaving invention and being covered.For example, the not balance plate of segmentation can be set also, this balance plate can leave from nonmagnetic wall section zone more or less by manual or remote control.May require this balance plate or this two balance plates to segment again according to the promptly fixed structure situation of supporting construction.In principle here with other remodeling sought the same, balance plate leaves the distance of non magnetic wall section and their area and they should so be considered in the path that tangential direction is removed, can the optimum balance of the deflection of electric arc being as the criterion.
Except the possibility of describing of fixing and removing, also have other possibility to consider and to realize to balance plate or polylith balance plate part.In the middle of the remodeling of Fig. 6 and Fig. 7, can so realize balance plate, not be that two and half sheet balance plate 20a and 20b are left each other, but they are drawn close to the scope of nonmagnetic wall section 3.
The present invention is not limited to the wall section that is made of coiled pipe, does not use the body of heater of box-shaped wallboard also can realize for not using cooling tube.For such structure, tank wall is realized by nonmagnetic material.
Described by means of a body of heater for ease of understanding the present invention, this body of heater is made of unique wall section more than slag line S.For the body of heater of this class, the present invention is particularly preferably used, because it can replenish realization in existing furnace installation.The present invention too for constitute by steel and the furnace binding of an inner body of heater that is provided with the refractory material lining on be provided with.Self-evident, bascule is directly just fixed against the attached structure that helps against tube wall.In addition, such structure corresponding the structure of institute's segmentation body of heater of describing and illustrating.
Claims (11)
- Direct current electric arc furnace have the stove outer covering, a hearth electrode (9) of heat-resisting furnace wall, steel and one by the power-supply device (7) that is positioned at stove (1) outside by big current feed line (8+, the consumable electrode of 8-) being powered (2), it is characterized in that, at least stove outer covering wall section (3) is by nonmagnetic substance, preferably be made of nonmagnetic steel or copper, and this wall section preferably is arranged on a side relative with power-supply device (7) of stove (5).
- 2. claim 1 is described by direct current electric arc furnace, it is characterized in that, in stove, be that a large amount of water cooling wall sections by steel constitute in the heat-resisting furnace wall of the above scope of slag line, this water cooling wall section is fixed on the supporting construction, have at least a wall section to be by nonmagnetic substance, preferably to be made of nonmagnetic steel or copper, this wall section is preferably disposed on a side relative with power-supply device (7) of stove (5).
- 3. claim 1 or 2 described direct current electric arc furnaces is characterized in that, for non magnetic wall section partly is that wall section (3) is provided with balancing equipment (19,20a, 20b), being used to compensate non magnetic wall section partly is the magnetic action of wall section (3) to electric arc.
- 4. the described direct current electric arc furnace of claim 3 is characterized in that, described balancing equipment comprises one or more balance plate that is made of magnetic steel (19,20a, 20b), the outside that it partly is wall section (3) that this one or more balance plate leans against non magnetic wall section.
- 5. the described direct current electric arc furnace of claim 4 is characterized in that, it partly is on the wall section (3) that one or polylith balance plate removably are fixed on nonmagnetic wall section.
- 6. the described direct current electric arc furnace of claim 5 is characterized in that, one or polylith balance plate use pin (22) to be fixed.
- 7. the described direct current electric arc furnace of claim 4 is characterized in that, it partly is that wall section (3) one segment distances are disposed that balancing equipment (19,20a, 20b) leaves non magnetic wall section.
- 8. the described direct current electric arc furnace of claim 7, it is characterized in that, balancing equipment comprises a part or manifold balance plate (19), it partly is on the wall section (3) that this balance plate removably is fixed on nonmagnetic wall section by means of carrying bolt (24), and the distance of balance plate and non magnetic wall section part or wall section (3) is adjustable.
- 9. the described direct current electric arc furnace of claim 7 is characterized in that, balancing equipment (20a, 20b) is transportable against the non magnetic wall section part or wall section (3) outside on the stove tangential direction as a whole, and from this segment distance is arranged.
- 10. the described direct current electric arc furnace of claim 9, it is characterized in that, balancing equipment is made up of two balance plate half sheets (20a, 20b), these two balance plate half sheets can be clamped on the maintenance equipment (27,29) movably, and they can move towards each other and/or move with respect to non magnetic wall section (3).
- 11. each described direct current electric arc furnace is characterized in that in the claim 1 to 10, the thickness (d) of balance plate or a plurality of balance plate (19,20a, 20b) is the twice of the wall thickness (w) of wall section (3) at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113127 CN1180159A (en) | 1994-12-24 | 1995-12-22 | Furnace vessel for DC arc furnace |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4446542.4 | 1994-12-24 | ||
| CN 95113127 CN1180159A (en) | 1994-12-24 | 1995-12-22 | Furnace vessel for DC arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1180159A true CN1180159A (en) | 1998-04-29 |
Family
ID=5079883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95113127 Pending CN1180159A (en) | 1994-12-24 | 1995-12-22 | Furnace vessel for DC arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1180159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101331375B (en) * | 2005-12-20 | 2012-05-02 | 弗雷德里克·彼得勒斯·格雷林 | Compensation system and method for arc skewing for a DC arc furnace |
-
1995
- 1995-12-22 CN CN 95113127 patent/CN1180159A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101331375B (en) * | 2005-12-20 | 2012-05-02 | 弗雷德里克·彼得勒斯·格雷林 | Compensation system and method for arc skewing for a DC arc furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Baden, Switzerland Applicant after: Asea Brown Boveri Ltd. Address before: Baden, Switzerland Applicant before: ABB Management AG |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: ABB MANAGENMENT CO., LTD. TO: YA RUIYA BOLANGBOWLIC CO., LTD. |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |