DE1433424A1 - Chamberless melting furnace, in particular for steel production from scrap and coal - Google Patents

Description

Λ-SX ,

Investment and patent management company with limited liability

Chamberless smelting furnace, especially for steelmaking from scrap and coal

Addition to the patent (application B 66 360 VIa / i8b)

The subject of the main patent is a melting furnace, in particular for steel production from Sohrott and carbonic agents, the one with burners for gaseous, liquid or dusty Fuels and oxygen or oxygen-enriched air is heated and in which the gases are extracted through an opening in the furnace vault, above which a movable, z · B · displaceable or pivotable, gas vent is arranged is.

IkLe invention is based on the knowledge that the furnace according to the main patent for all associated with a Prisehvorgang Steelmaking process is very suitable, even for those processes in which the Prischen by inflation of Oxygen takes place and / or in which the deoxidation is carried out under a ¥ eO-poor slag in the manner as it is common in the arc furnace

According to the invention, this general applicability of the The furnace according to the main patent is achieved in that the furnace can be heated either with burners or electrodes »

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ORIGINAL INSPECTED

In such a furnace one can then melt down and Irish with burner heating and deoxidation under Carry out heating with electrodes. When freshening, oxygen can also be blown onto the bath, either the burners or "certain burners for inflating d-oxygen" are used or become "special Nozzles for this purpose. Practically all steel grades can be produced in the furnace, including those "" "Particularly high requirements are placed on the site, as with electrical steel, since the steel is deoxidized by heating the melt with electrodes «Deoxidation can be carried out in the same way as in an electric furnace under a low-FeO slag »

The implementation of the melting in the furnace according to the invention can be carried out as ₉ that the furnace charged in the usual in Siemens-Martin procedure with scrap and serving as carburizing products pig iron and wirdo melted the feed using operated with fuel and oxygen burners, the As is customary in Siemens-Martin ovens, decarburization and dephosphorization can be carried out using the oxidizing flame over the varnish. " But you can also freshen up with oxygen, which is blown onto the bath and reacted immediately with the melt

But there is also the possibility of charging the furnace according to the invention with liquid pig iron and this as in the LIMEonverter to fresh with oxygen, whereby more scrap can be added than with the normal LD process, because the heating of the furnace enables the supply of heat to melt down scrap in larger quantities »after the refining and if necessary After the dephosphorization slag has been removed, the deoxidation can then take place under a new slag © and with heating the melt can be carried out with electrodes «,

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In the drawing, embodiments of furnaces are naeli of the invention shown «.

Pig. 1 shows a chamber open in section and view Melting furnace with swiveled-out electrodes "with burner heating

Figo 2 shows the same oven with electric electrode heating

Figo 3 shows two chamberless melting furnaces according to the invention seen from above while

Pig · 4 one of the two ovens from the standoff side when operating with burners and

Pig «5- the corresponding furnace from the deslagging side showed when operating with electrodes

In the furnace shown in Figo 1 and 2 is in the circular furnace vessel 1 by means of the central head burner

2 the charge stored on the stove 3 melted down. The furnace vessel 1 is tiltable on the cradle 5 as this side burners 12, which can be raised and lowered and also pivoted, are provided, which can be adjusted in their position when melting the respective surface of the material to be melted or partially blocked, so that the bath free oxygen in an amount of 1-5 NmV ^ and Min ₀ , preferably about

3 NmV ^ Uo Mino is supplied. In the furnace vessel 1 are one or several doors 13 and a viewing opening 15 for observing the melt through evenly provided on the Channels 16 distributed around the circumference of the furnace will leak air into the furnace

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sucked, which cooled the vault 6 The gas exhaust 8 can be pivoted by means of the pivoting column 19 · Next to the furnace is a pivotable lifting cylinder 20 is arranged, which serves to hold the cover 6 and the electrodes 22 including their drag device 23 swiveling out and in by means of the swivel arm 21 The power supply to the electrodes 22 takes place via the busbars 25 and the flexible lines 24o

If you want to switch from the burner heating to the electrode heating, the burners 2 and 12 are first pulled up and the gas vent 8 swung out into the position shown in Fig. £, Then the swivel arm 21 with the electrodes 22 and the cover 6 ¹ over the furnace pivoted and the cover 6 placed over the opening 7 of the vault 6 and the electrodes 22 retracted

Figo 3 shows two ovens according to the invention, which are so with each other are coupled so that the burner and the electrodes can be used alternately for both furnaces »Das hat the advantage that the complex device for the Elsktrodenbetrieb is better utilized and that the pause and cooling that occur during the burner heating the electrode life is reduced, avoided or shortened ο

The two furnaces 31 and 32 are arranged so that they both 33t in a ladle car which is movable on the track 34, can be emptied ₀ On the opposite side of the furnaces 31 and 32 Schlackkübel 35 and 36 are provided "According to the invention for both ovens only one gas extractor 37 and only one Sohwenkgerüst 38 provided for the electrodes 39.A saturator and dust separator 42 is also arranged on the swivel arm 41 for the gas extractor 37, which is arranged on the Sohwenksäule 40, from which the gas flows through the line 43, the

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against the derivative 43 '(Figo 4) is rotatable, is derived DLe electrodes 39 are by means of the swivel frame 38, the is supported movably on a roadway 44, pivoted from one furnace to the other

In Pig »4 and 5 the working platform of the ovens is indicated by 45. Both furnace vessels 31 and 32 can not only be tilted on cradles 46 and 47, but also on rotating mechanisms 48 and 49 rotatably mounted «The rotation of the furnace vessels is intended to accelerate the melting of the insert. As the furnace vault 50 and 51 are not rotated, you can by appropriate arrangement of the burner 52 (Pig. 4) on the Swivel arm 41 at different distances from the axis of rotation of the furnace vessel sweeps the entire stove with the burner flames.

Like from Pig. 5 is the electrode carrier 53 arranged on the swivel frame 38 the transformer 54 », which is also intended for both furnaces, is swiveled with the swivel frame 38, whereby this is supported on the roadway 44. When dimensioning the transformer, it can be taken into account that this not for the high power requirement of the melting down, but only for the much lower power requirement of the tormenting period needs to be measured. The current is fed to the electrodes 39 through the flexible lines 55. The furnace vault 50 and the cover 56 closing off its exhaust gas opening can be raised and lowered on the swivel frame 38 hung up.

While in Pig. Positions of the pivoting devices 38 and 40 shown in Figure 3, the oven 31 provides Peinungsarbeit, is melted or in a furnace 32 by means of the burner 52 of the insert, is refined with oxygen which is blown through the burner 52 or other Säuerstoffdüsen the melt. Should after parting the

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refined melt of the furnace 31 in the pan 33 the devices are swapped, the pivot arm 41 is pivoted from the position shown into the position B ^ (Figo 3) indicated by dash-dotted lines, whereby the path for the pivot frame 38 is free, which is now from the illustrated position A is pivoted beyond the dot-dashed position A -j also that after filling the furnace vessel 31 with scrap or * liquid pig iron, the pivot arm 41 with the burners 52 can be brought into position B 2 above the furnace vessel 31 _o The swivel arm 38 is then brought into the swivel position A -j «

Claims;

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Claims (1)

Patent claims Melting furnace, in particular for steel production from scrap and coal, which can be heated with burners for gaseous, liquid or dusty fuels and oxygen or oxygen-enriched air and in which the gases are extracted through an opening in the furnace vault, above which a movable, z _e B _e movable or pivotable, gas vent is arranged, -aaa -, characterized in that the furnace is optionally heated with electrodes can be" 2 »Melting furnace according to claim 1, characterized in that that it is equipped with means for blowing the melt with oxygen » 3β melting furnace according to claim 1-2, characterized in that that the electrodes and the movable gas outlet are each arranged on a pivoting device » 4. Melting furnace according to claim 3, characterized in that that the pivoting device for the electrodes also carries the transformer » 5. Melting furnace according to claims 3-4, characterized in that that at the Sohwenkeinriohtung for the electrodes a cover hangs over the gas vent that can be raised and lowered » 909808/0193 ' ^J. EV 141/62 _ ₂ _ Melting furnace after. Claim 3 - 5f dadurcli characterized that the burners for the movable gas exhaust are also attached to the Sehwenkeinriehtung » Melting furnace according to claims 1-6, characterized in that that it is coupled to a similar melting furnace so that the electrodes and the transformer can be used alternately for both ovens «, ■ 8ο melting furnace according to claim 7 »characterized in that that the gas vent and the burner alternate for both Ovens can be used «, Method for operating the melting furnace according to Claims 1-8, characterized in that the fixed insert melted by means of the burner and the melt is refined with the burner flame or by blowing oxygen and heated with electrodes is deoxidized o 10. A method for operating the melting furnace according to claims 1-8, characterized in that liquid pig iron used, freshened by blowing oxygen and the melt under heating with electrodes is deoxidized o 11o method according to claim 9-10, characterized in that that the inflation of the oxygen takes place by means of one or more of the burners, their fuel supply completely or partially closed o 909808/0193