ES2265539T3 - DOUBLE OVEN INSTALLATION FOR THE PRODUCTION OF STEEL MATERIALS. - Google Patents

Abstract

Double oven arrangement has a tilting stage (29) arranged between two tilting oven stages (3) with a tilting, lifting and lowering electrode support device (16) formed on the tilting stage. The tilting stage can be tilted depending on the tilting movement of an oven stage for an oven vessel (4).

Description

Double furnace installation for the production of steel materials

The invention relates to an installation of double furnace for the production of steel materials by means of alternating load of ferrous cementing materials, insufflated from oxygen and electric arc fusion in each case by means of a oven A and oven B, arranged in each case on a platform tilt oven and with a rotating column arranged between the ovens A and B, to which a support device of electrodes that can be raised and lowered and with a device rotating for at least one oxygen insufflation lance.

A double electric arc furnace installation known from documents DE 44 34 369 and EP 0 717 115 B1. It should be assumed that the two oven containers are arranged in each case on a separate tilting platform. Between these two tilting platforms are planned on the fixed furnace platform the rotating electrode support device, which can rise and fall. In this way the scrap can be melted alternate way in two oven containers. While according to this in an oven container by means of the support arms of rotating electrodes, which can be raised and lowered feeds  electrical energy to the melt, in the second container of furnace can be carried out laundry and fed scrap to The next melt. In the case of the known installation a from document DE 44 34 369 both kilns are assigned a common lance device that cannot swing.

In the case of a double oven installation called CONARC (CONARC is a protected brand of the SMS company Demag AG) an oxygen lance can be used, for example in shape of an upper spear ("Toplanze") during the use of the electrodes in the first fusion vessel in the second container.

In this known arrangement it has turned out to be less favorable that the electrode support device does not can swing simultaneously with the tilting platform corresponding and the respective oven container. If the use of electrodes is also convenient in a tilted position of the oven container, it lacks the necessary conditions. In general the electrode conduit It must have a larger opening than normal. Also must be considered that the passage of the electrodes through the cover of oven requires a journey as small as possible. In this regard a reduced path is generally achieved by planning of roller and cam cradles. Notwithstanding the Use of cribs of this type is related to high technical complexity Also during the tilting of the container of coated and loaded furnace significant forces appear in the unit piston-cylinder In addition to roller and crib cradles Cams are subject to high wear. The roller replacement and lanes is also related to high and long costs downtime of the production facility. With the help of all these measures the angle of inclination that can achieved should be estimated in any case at approximately ± 3rd.

Double oven installations are still known, for example from document DE 4138120A1 that with the help of a lifting and turning mechanism suspend the support device of electrodes in each case of the oven container to be tilt To do this, by the lifting and turning mechanism, It requires a high technical expense. Also in practice this type Construction has proved to be very prone to failures.

Therefore the invention is based on the objective of configure the use of electrodes in a double oven without limitation by the mechanics of the oven.

The proposed objective is resolved according to the invention with the double oven installation described at the beginning because between the two tilting furnace platforms, a third tilting platform, on which the rotating electrode support device, which can be raised and get off and because the third tilting platform can tilt in direct function of the tilt movements of in each case one of the oven platforms for a container of oven and because to the third tilting platform with the rotating electrode support device, which can be raised and getting off is assigned its own rocker drive with a control device This is why you can work with less problems also in case of a tilt oven container with the electrodes, which is very advantageous especially in the stages of process that are carried out in the double oven procedure or from CONARC. In this way they can also be put into operation simultaneously the corresponding oven platform and the third tilting platform absolutely. The use of a third tilting platform of this type is possible at least in case of a double oven of DC and AC. Special advantages are obtained for different procedural steps, such as for example the pig iron loading, defosforation, slag reduction and Similar.

A configuration is based on the third tilting platform with electrode support device swivel, which can be raised and lowered alternately can block with the corresponding oven platform to be tilt This generates tilting movements. absolutely dependent between the furnace platform of a Baking vessel and the third tilting platform.

In addition to the present embodiment there is a proposal to form the control device of the own tilt drive from a device synchronization, which can be connected to the control device of the corresponding oven platform to be tilted.

In addition another advantageous embodiment is achieved because the own rocker drive is formed to from a piston-cylinder unit arranged in the inside of the base. So far the space has not been used necessary for this between the furnace platforms for oven containers.

Another measure to guarantee the different tipping actions is achieved because with a connection existing synchronization device with the device corresponding control of a furnace platform that has to toggle a connection to the other control device is blocked corresponding to the other oven platform correspondent.

A refinement of the invention provides that in the rotating cover device assigned to the oven A and B in each case an oxygen lance is integrated in each case, being arranged the combined swivel device for insufflation cap and lance on the tilting oven platform.

Although for this design the installation an additional O_ {2} lance must be provided with spear conduction and feeding of O2, the advantages are based on that oxygen lances are not required separate rotating devices, but the lances are integrated on existing rotating cover devices. Simultaneously and this being a special advantage, the spears of O_ {2} along with rotating devices on the oven platform can Tilt together with the ovens. So the oven can tilt with the spear of O_ {2} descended. In addition the installation is less vulnerable in case of failure of a spear of O_ {2}, because the operation can continue in the other oven.

The installation according to the invention with the tilt electrode support device and devices swivel covers that can swing with oxygen lances integrated is perfected by it advantageously because the known complex lid lifting mechanism is replaced by a support arm construction with lifting mechanism. In each case the rotating cover device also has support arm for the oxygen lance at least one arm additional support, preferably two support arms, for the Oven lid and spear cover of O2. These support arms They are arranged at one end at a rotating column. At other end, which extends through the covers are arranged cylinders hydraulic lifting, connected to the top of the lid correspondent. Through these lifting cylinders they can place or remove the covers on the oven correspondent. These lifting cylinders are arranged so distributed over the support arms.

In addition the installation is perfected by an advantageous exhaust gas installation. At this time to from the basic idea a common exhaust gas line by oven assumes the evacuation of hot gases and dusts both during the process of fusion as of insufflation. This driving of Exhaust gas is configured from multiple parts. A tube part, which is arranged directly on the oven lid, is configured as a tubing detachably with respect to the conduit of remaining exhaust gas and can rotate in decoupled state together With the oven lid. When the oven lid is turned on the oven, this tubing is aligned flush with the exhaust gas pipe remaining, the exhaust gas pipe connected to the tubing together with the oven platform. This has the advantage. that the container can be opened in a slightly complex way oven for loading and only one part of the elbow should be turned tubular.

In total you get an installation that in comparison with the state of the art shows one more embodiment economical of the lid lifting mechanism and the device suction elbow lift to be raised. In this way the tilt by the furnace platform is cheaper than the tilting by means of a cradle of rollers. In addition the supply of cooling water to the oven lid can be performed in a fundamentally safer way regarding operation and cheaper, because a favorable disposition of the cooling water pipes to the oven lid. The costs manufacturing of the entire installation are reduced in its entirety, simultaneously increasing safety in operation and installation flexibility The possibility of plan the concept of installation in existing warehouses.

Examples of embodiment of the invention, which will be explained below with more detail

They show:

Figure 1, a vertical plane of a double oven installation,

Figure 2, the plan view belonging to Figure 1 on the double oven installation, with a cover of oven turned from oven container B

Figure 3, the third tilting platform in normal position in side view,

Figure 4, the third tilting platform in the tilted back position,

Figure 5, the third tilting platform in a position tilted forward,

Figure 6, a plan view belonging to Figure 1 on the installation of double furnace in another position of operation and

Figure 7, a plan view of the electrode support device with charging device later.

On bases 1 for an oven A and the same oven B of an arrangement of double electric arc furnace by in the middle of a substructure 2 a platform is provided in each case 3 tilting oven for an oven container 4 with a lid 5 of oven in each case (compare with figure 1). Electrodes 6 they are fed by an oven transformer 7 (compare with the Figure 2) via a high intensity current connection 8 to through a wall 9 of the transformer house by means of 10 high current power cables. The electrodes 6 can rotated by means of a rotating column 11 on the oven A or the oven B.

For this the electrodes 6 are placed in a upper position represented in figure 1 by a column 15 of elevation in the rotating column 11. At this moment is spear 13a of O2 is located on the oven B by means of a rotating device 12 which is also on the oven platform 3 for the oxygen insufflation lance 13a.

The electrodes 6 are used by means of the lifting column 15 with a column guide and device 16 electrode holder at its height for the regulation of power supplied Next, arms 17 and 14 of support for an internal electrode cover 18 or an internal lid 21 similar for lances 13a and b of oxygen insufflation. Cover 18 Internal electrode can be adjusted in height by means of lifting cylinders 19 (compare figure 2). There is also a device 20 for subsequent charging of electrodes. Cover 18 internal electrode is maintained by means of arms 17 of support.

To the exhaust pipe 23 connected to the tilting platform 3 must be connected with a rotated position inwardly a stationary exhaust pipe 24 with a chamber 25 afterburner. From the oven B the gases are evacuated Exhaust by means of an exhaust gas pipe 26. (Cover 21 oven is turned out in figure 2). The tubes 23, 24 of exhaust gas and the exhaust gas pipe 26 are connected each. Between each of the components there are interstices, which allow the corresponding oven movements. He gap between duct 23 and 24 can be specially adjusted manually. The gap between tube 24 and pipe 26 Exhaust gas can be adjusted using a sliding sleeve. By modifying the air gap, the amount of suction from the oven and the pressure in the oven container and the amount of secondary air needed for the post combustion (and refrigeration). The inner cover 21 of the lances insufflation can be adjusted in height by means of a cylinder 33 of elevation.

Between oven platforms 3 of ovens A and B there is a third tilting platform 29 on which they find the rotating platform 11 and the loading device 20 electrode back On the third tilting platform 29 on the rotating column 11 is the support device 16 of electrodes that can rotate, rise and descend on the other end with respect to the rear loading device 20 of electrodes This third tilting platform 29 is blocked from alternate manner according to a first embodiment with the corresponding oven platform 3 to be tilted. A second embodiment provides for a tilting drive 30 own for the third tilting platform 29 (compare with the Figure 3), which in the embodiment example is composed of a unit 31 piston-cylinder, located inside the base 1.

The third tilting platform 29 is located according to figure 3 in a normal position, in figure 4 in a position tilted forward and in figure 5 in a position tilted back, depending on oven position and corresponding load.

From figures 2 and 6 it becomes clear the arrangement of the corresponding rotating devices 12 for the oven covers 5 and the internal covers O 2 with spear 13a, integrated oxygen b. The combined rotating device 12 together with the function of turning the lid, it also presents the function to take the lance to the center of the oven for oxygen insufflation 13a, b. The installation of lances of O_ {2} is not above the fixed furnace platform, but it is integrated into the tower swivel for the rotation of the lid, which is arranged on the tilt oven platform 3. In detail, device 12 swivel consists of an internal central support arm 27, in whose tip is arranged a lance 13a, b of O2, which is fed through an oxygen conduit through the support arm. The spear 13a, b of O2 is held by support arm 27, which it is connected to a guide column and is driven with rollers guide. The lifting movement of the support arm 27 and the spear 13a, b of O2 is carried out by a cylinder hydraulic mounted on the guide column.

The rotating device 12 further comprises two support arms 14 of the lid support structure, which is extend over the oven lid 5 and more specifically in the first place parallel to the central lance support arm 27, for then, when they have reached the edge of the inner lid 21 of O_ {2}, be separated in the form of V. Thus the arms 14 of Stand extends both over the oven lid and over the lid internal lance of O_ {2}.

The support arms 27 and 14 have rotating way by means of a rotating column with a bearing of rollers, turning the support arm together for throws 27 and the support structure for the way caps.

In comparison to the usual facilities in this case the regulation of the cable winch of the oxygen lance by regulation by means of support arm, guide rollers and hydraulic cylinders. When assigning spears 13a, b to 12 rotating devices, the oven platform It is free on the side of the door. This improves the visibility of the command post on the oven installation and on the electrode rear loading device 20. I dont know interferes with the passage of the scrap basket and transport of the vessel by the installation of lances of O_ {2}. When designing the width of the ship when building a new installation should not take into account the rotation of the spear of O_ {2}.

Along the support arms 14, They have lifting cylinders 22, 33 and more specifically three for the oven lid 5 and four for the inner lid 21 of lances. They are arranged in each case corresponding to the edge of top. The lid or covers are turned on the oven and then move down on the lifting cylinders 22, 33 by movement of the piston rod corresponding to a closing position The lifting linkage of the cylinder 22 of lift for the oven lid 5 is decoupled from the lid 5 in the lowered position, so that a rotation of the rotating device 12 with the support arm 27 and the lance 13 and the support arm 28 with the lance cover 21 with a cover 5 of oven placed on the oven container 4.

With the help of figures 2 and 6 are represented the different process states of the Conarc procedure, especially for the production of carbon steels and steels tuned, such as stainless steel. According to figure 6 in the oven A the insufflation process takes place, while simultaneously in the oven B the melting process takes place with 6 electrodes inserted. For the insufflation process the rotating device 12 is rotated on the oven A. With it or the support structure (14) for cover 5 or support arm 27 for the lance 13b the oven cover 5 with the gas pipe 26 of Exhaust, the O 21 inner lance cover 21 as well as the lance 13b of oxygen is rotated on the center of the oven.

During the melting process the oven lid 5 with the exhaust pipe 26 it is also located on the oven container 4 (in figure 6 the oven B). With the rotating device 12 the lance 13a and the internal lance cover 21 They are turned out. The electrode arm is turned on the center of the oven B.

The rotating electrode device also It consists of a support arm construction, being able to the inner cover 18 of electrodes on cylinders 19 of lift positioned along the support arms 17 in the Heart of the lid. Inside the arm construction of support configured primarily in a rectangular manner is configure three electrode support arms 16, in whose ends are fixed electrodes 6.

The shown state of the oven A of Figure 2 corresponds to the state of the oven B of Figure 6. The oven B of the Figure 2 shows the state of the oven completely open. By means of the rotating device 12 or the support structure is both the oven cover 5 rotate, with the gas pipe 26 of exhaust attached to it, such as the internal lance cover 21 of O_ {2} together with lance 13a.

For subsequent charging of electrodes 6, which due to the burning of the electrode tips they must move slightly down, electrodes 6 are rotated with column 11 swivel up to a central rear loading device 20 (compare with figure 7), which in the installation shown found between the two ovens A and B.

The use of the third platform 29 Tilting is possible in the case of double DC or AC furnaces. Without However construction is especially advantageous to apply in the case of a CONARC double oven installation, in which they are carried out different procedural steps, such as pig iron loading, the defosforation, slag reduction and the like.

List of reference numbers

TO

oven TO

B

oven B

one

bases

2

substructure

3

tilting furnace platform or tilting frame

4

oven container

5

 top of oven

6

electrodes

7

oven transformer

8

high intensity current connection

9

 wall transformer house

10

high power cables intensity

eleven

swivel column for arms electrode holder and internal electrode cap

12

rotating device for the lance of insufflated, the oven cover and the internal lance cover

13

insufflation lances (a + b)

14

support arms for the oven lid and the internal lance cap

fifteen

lifting column for the arms of electrode holder

16

electrode support device, electrode support arms

17

support arms for the inner lid of electrodes

18

top internal electrode

19

lid lift cylinder internal electrode

twenty

rear loading device electrodes

twenty-one

top of oven

22

lifting cylinder for the cover oven

2. 3

tube exhaust gas on the tilting frame

24

tube of stationary exhaust gas or exhaust gas pipe towards the post combustion chamber

25

post combustion chamber

26

exhaust gas pipe

27

arm support for the insufflation lance

28

arm of support for the internal lance cover

29

third tilting platform or third tilting frame

30

own rocker drive or own drive for the third tilting frame

31

piston-cylinder unit or tilting cylinder

32

lifting column for the arm of insufflation lance holder

33

lid lift cylinder internal spear

Claims (9)

1. Installation of double furnace for production of steel materials by alternating loading of materials from ferrous cementation, oxygen insufflation and arc fusion electric in each case by means of an oven A and an oven B, arranged in each case on a tilting oven platform (3) and with an electrode support device (16) that can rise and descend arranged between furnaces A and B and with a turning device for at least one oxygen lance, in which between the two tilting oven platforms (3), a third tilting platform (29), on which the rotating electrode holder device (16), which can rise and fall, and on which the third platform (29) swingarm can swing directly based on the movements of tilt of in each case one of the oven platforms (3) for  an oven container (4), in which to the third platform (29) tilting with electrode support device (16) swivel, which can be raised and lowered is assigned a own tilt drive (30) with a device control. 2. Double oven installation according to claim 1, characterized in that the third tilting platform (29) with the rotating electrode support device (16), which can be raised and lowered can alternatively be locked with the oven platform (3) that has to swing in each case. 3. Double furnace installation according to claim 1, characterized in that the control device of the own tilting drive (30) is formed from a synchronization device that can be connected to the control device of the corresponding furnace platform (3) which has to swing. 4. Installation of a double furnace according to one of claims 1 or 3, characterized in that the tilting drive (30) itself is formed of a piston-cylinder unit (31) disposed inside the base (1). 5. Installation of a double furnace according to one of claims 1, 3 or 4, characterized in that with an existing connection of the synchronization device with the corresponding control device of an oven platform (3) to be tilted, a connection to the another corresponding control device for the other corresponding oven platform (3). 6. Installation of a double furnace according to one of claims 1 to 5, characterized in that a rotating cover device for each furnace A and B, in which in each case the rotating device for the oxygen lance (13a, 13b) is integrated , the common rotating device (12) being arranged on the tilting oven platform (3). 7. Double furnace installation according to claim 6, characterized in that the common rotating device (12) has a support structure for the furnace cover (5) and the O2 lance cover (21) and an arm ( 27) support integrated therein for the oxygen lance (13a, b) and because the electrode support device (16) has a support structure for the electrodes (6) and for the internal electrode cover (18) . 8. Double furnace installation according to claim 7, characterized in that the cover support structure and the electrode support structure have hydraulic cylinders (19, 22, 32) arranged in a distributed manner according to the geometric extension of the cover ( 5) of oven, of the O2 lance cover (21) and of the internal electrode cover (18) on the support arms (14, 17) that form the support structure and through which the Corresponding covers can be moved from an elevated turning position to a lowered oven closing position and from which the covers can be disengaged. 9. Double furnace installation according to one of claims 1 to 8, characterized in that each exhaust furnace (A, B) is assigned an exhaust gas duct, through which the exhaust gas is evacuated from the furnace during the process of fusion or during the refining process and because the exhaust gas duct is configured of multiple parts, an exhaust gas pipe (23) connected to the tilting platform (3) can be connected in an inwardly rotated position through a stationary exhaust pipe (24) with a post-combustion chamber (25), and because an exhaust gas pipe (26) disposed on the furnace cover (5), is removably configured with respect to the tube ( 23) Exhaust gas and in disengaged state can rotate together with the oven cover (5).