DE2111504C3 - Electric arc furnace - Google Patents

Description

The invention relates to an electric arc furnace for melting metallic and non-metallic ones Batches with an annular hearth of preferably trapezoidal., M n, j'n widening at the top Cross-section.

From the French patent specification 409 540 an electric arc furnace for melting steel is known, which has an annular trough and electrodes immersed in it.

From the French patent 1 598 101 a movable furnace for ui. Preheating, that Melting and cleaning of metal is known, the traversable trays of which are trapezoidal, according to above widening cross-section be itzcn.

These well-known ovens are for relatively small outputs designed.

The present invention is based on the object of specifying an electric arc furnace which has a compact design even with outputs of over 100,000 kVA.

In an electric arc furnace, this is used to melt metallic and non-metallic charges with an annular center of preferably trapezoidal cross-section that widens upwards according to the invention achieved in that in the free central interior of the stove the electrical "Stand and the electrode holder, or instead of them the transformers, or instead of them the Gas cleaning are arranged, and that the tap openings and the tapping channels on the annular Stove either in the direction of the free central furnace space or in a manner known per se show outside.

The stands with the electrode holders are advantageous mounted on a Auflagcrplatte, which with a drive for their rotation about the vertical axis is provided.

With such a furnace construction, electric furnaces with an output of over 100,000 kVA can be produced, whereby a large number of electrodes with a diameter that is not too large can be used, the long service life auhvv.-scn and the elecrode stttnder una ria.iL-r r. otr the. Transformers or gas purification au ■ 'entralen free interior disordered "vcden fcijn-

something new for power supply or gas extraction short distances with low Vcnusleu results. When the tapping channels on the ring-shaped edge white in the direction of a free central furnace space. ; ■■■ a continuous or discontinuous ;; ... Meiuii-

! o eieiten an imminently unisr the oven bcim.l-Tiche Fließbaridgießmau-CH Me possible and you κ; _..-;! - Refrain from any intermediate transport if: •• ■. There is further savings in production space.

If in the free central interior the stant! ·. <

J _{5 together} with the electrode holders are arranged on a support q.h ■■; -. · Which can be extended around iü, · vertical axis d; by means of a drive, eliminates the need! build, and it can still be a GL-IN.

In general, a temperature distribution is achieved and the formation of a build-up and an open, unexpected light beam are prevented.

When arranging the transformers in the free central The interior can use the electrical convection the transformers with the electrodes! -. :> tern are kept short, so that the electrical .. losses are considerably reduced.

When arranging the gas purification equipment, Leave a free central interior space; I reduce the suction losses quite considerably.

The invention is now based on exemplary embodiments described in more detail with reference to the drawings. It shows

1 shows an electric arc according to the invention

oven, do oven gas purifiers are arranged at the central in the free inner space, in, section through dieVertikalachse _s de furnace,

F i g. 2 an electrical supply circuit for the Oienin partially top view,

Fig. 3 shows an electric arc furnace whose ring is a shaped hearth of trapezoidal, upwardly widening cross-section, being in the open central Interior transformers and taps, are arranged

F i g. 4 the in F i g. 3 furnace shown in plan,

F i g. 5 an electric arc furnace, in which the stands of the electrode holder on a rotatable Support plate are mounted, in section through the vertical axis of the furnace,

F i e. 6 the in F i g. 5 furnace shown in plan.

Embodiment I.

The electric arc furnace for melting metallic or non-metallic charge has an annular hearth 1 (Fig. I and 2), in which electrodes 2 are immersed. The electric The furnace is fed from a power supply line via furnace transformers 3 and short cables 4. The electric arc furnace is mounted on a support plate 5, which is on rollers 6 is put on to rotate the stove 1. Tapping openings are provided for tapping the melt from the hearth 1 24 provided with tapping channels 7.

If the electric arc furnace is designed to be closed, it has a vault 8. For cleaning of the gases that come out of the furnace is one

9 wet pass cleaning available. This is! wrong. free central interior space 23 and has inclined KUige 10. hatches intended for their cleaning are to be closed with lids 11, as well S; multi-part hollow giant egg washer 12 and gas cables 13 for the gas guide * u (from the drawing not visible) apparatus for fine cleaning. The electric arc furnace works as follows: One batch to generate the melt w.rd continuously placed in oven 1. Then The electrodes 2 immersed in the Herdl are fed from a power supply line via furnace transformers 3 and the lines. 4 to. At the Current flow through the Elektrouen 2 is in the under these located space develops a service, which the heating of the input materials Γ-f d-.J melting temperature and the draining of chemical reactions guaranteed in them. Here-execution example! 2

io hrg

The main thing is the same Lon- The O cn ^^ ^ _{the in the} ^ »game 1 he-

structure. LUm.nu. _{related to} it, uaß

«ChnebenO cn ^ aul. Im _{the trape} , farm, yen

™ J? ^ _U "£ _sn central interior 23 s tub to £ · ^ _{| β a E} , _n r,

Furnace B ^^ _the melt, de a pan

» ⁴ ™" f '^ S. The furnace transformer 3 b, -

machine ^{. 16 ^ 1} "interior space.

i.nden sdum jntr-Ie _η ^ ^ Absfcho -

^{D 'e} "°" ^ _forming melt enters the Gl - NiMg 24 au ^. en _{the sdimdzc} d _to n from

^ ^ ^] [% _m ^fc _dte receptacle of the _f ^ ^ _we , _{ch ayc}

^ n is _{then loaded into the} warehouse.

nimg

* 5 pan
the G

the medergesxhmolten batch. The finished one Melted cream is made from the continuously operating θΐη through the tapping openings 24 (openings m * Sr wall of the tub) continuously over the sealing gutters 7 or discontinuously depending on what is done Process cut off. ,

^ε Upon melting and forming the ver.au cnden in the batch chemical reactions in the SiCN oie ,, gases entering the gas cleaning 9

From the furnace, the gas flows through the inclined gas flue 10 into the hollow trickle washer 12 where it is subjected to a coarse cleaning of larger dust particles. For convenient operation of the emze NEN departments of the furnace pan 1, the hollow barrel washer U is constructed in several parts. The gas then passes through the gas flue 13 into known apparatus for fine cleaning of the gas (Ventun tube, direct current cyclone). .

The electric arc furnace is operated by e.nem Drew pnasensystem with the help of furnace transformers? F i g. 2) fed, the out honors this

i ^ rS ^^^ S! ^ d. Arrival Pi, _klro lichtbo ^ nofen has a nngtorm- ^ J * irohcn _{and Eleklro} dcn2. You-

₅ gen rierd. (F g.- ^ _{5 the ofent} ran> for-

SP ^e «img des OJ.« «E to g ^^ _Dje ^ η, aiore, ■ un. d ^^ ^^ _{yon E} , _ek ,

, ^ hnlTCr.18 the guides located in the central interior i _d ns ^ then »^ ⁸ ^ _{latte 20}

· ⁹ J? ^ ^E ££ \ _Echen the melt, the oven down Zi ^ n '^ From hen _{hrinnen 7 au [To} DRE

^S / ^Kh ; ™. | " _{Dcr 17 the} electrode holder 18 with the hung of the S.andcrj 7 _{Vcrtikalachsc} when immobile, -35 ^ _{hung 9 um ^ a k}

£ a stove. Support plate 20 with I

allowed wel. . ^^ ^ _{cjnem Vertlka} " _age r

roll, 21

the furnace works similarly to .m BeBp.eH

The stands 17 of the electrode holder 18 U ^ _{the electrodes 2} are

_Iodic , “offset rotation.

ununt "broch P ^ _heating of the manufacturer

«---- A ^ written E. electric arc

D ^U e7o7en aTbeiteTwic "described above, Here f ^^^ V ^^ de'rS de'm resistance

The seat of the electrodes 2 is lower and more stable and comparable to the other, although _{this is true}

Loss of electrical energy at the furnace gcht min, -. O _d ^ ^s _fc ™ _{dstung was over} 126 MVA.

just.

1 sheet of drawings

Claims (2)

2 Π Ι 504 claim · - · 1. nektiOÜchibogenofen for melting metallic and non-metaPic batch.? With a ring-shaped hearth of preferably trapezoidal, upward widening! Cross section, characterized that in the free central interior space (23) of the cooker (I) the electrode strips (J7) and the electrode holder (18), or instead of these the transformers (3), or instead of these the gas cleaning (9) are arranged, and that the tap openings (24) and the tapping channels (7) on the annular Stove (1) either in the direction of the free central oven space or in a known per se Point outwards wisely. 2. Electric arc furnace according to claim 1, characterized in that the stand (17) with the electrode holders (18) are mounted on a support plate (20) with a drive is provided for their rotation about the vertical axis.