DE10234520B4 - Apparatus for banding a blast furnace - Google Patents

Abstract

Device for charging a blast furnace operated with an elevated counter pressure comprises a transporting strip for continuously introducing charging materials for a bell-throat closure (1) of the furnace, and feeders arranged outside and inside the closure. The inner-lying feeder is a funnel-like rotary distributor (10) having an axis of rotation (15) vertical to a small bell (2) and an outlet opening (11') lateral to the center of gravity of its inlet cross-section.

Description

The The invention relates to a device for Bandbegichtung one with an increased Counter-pressure operated blast furnace, with a conveyor belt for continuous feed from Möller, surcharges and predominantly coke as reducing agent existing feedstocks for Bells gout closure of the blast furnace and with loading devices above and within the bell-gout closure for task and material distribution the starting materials on top of each other arranged in a buffer bunk bells of different sizes.

The Blast furnace feeds make up a total of 2.0 to 2.5 times the weight of pig iron production. Identification of the unloading, Bunker, feeder and Belichtungsanlagen are therefore high performance if possible extensive mechanization. Under the direction of the system will be Transport devices understood that the starting materials to the top Transport the end of the blast furnace to the gout closure located there.

Known transport devices are Kübelbegichtung (bucket or tilt bucket (SKIP)) with inclined elevator or Bandbegichtung with a revolving conveyor belt, which is designed as inclined or vertical conveyor. Such Bandbegichtung is for example in the DE 198 24 367 A1 described.

With the transport devices are the starting materials at the top of the gout closure tilted into an upper funnel, the bottom through an upper small bell is completed. By lowering the small bell falls the filled Material in a large funnel arranged underneath, through a lower big one Bell is completed.

The Furnishing strongly influences the processes taking place in the blast furnace. Crucial here is primarily, as the coarse and Fine material existing feed materials distributed to the furnace cross-section because the fines provide a significant boost to rising gases greater resistance. At the Gichten slips over the material slope surfaces from; It creates a pouring ring of conical cross section, with a segregation taking place: coarse material is then outside and the fines inside.

conditioned due to increased environmental protection requirements and the need the oven in optimal operating conditions, such as increased back pressure To operate, a modification of many existing Gichtverschlüsse is required. In most cases This is achieved by installing sealing flaps in the material feed area and Silicone gaskets on the small bell, or on the seat ring, as well equipment achieved with a pressure compensation system. The resulting problem is the even distribution the starting materials on the small bell or in the material bunker. The layer distributors previously used for this purpose were pressureless Operation of the blast furnace no special requirements for the gas seal. Main problems of the back pressure operation and thus cost factors are the seals of the moving parts of the blast furnace, in particular in a continuous supply of material over a longer period of time in a band dressing, as well as the wear of the with the feedstock in contact inclined surfaces such as the bell seat surfaces.

A detailed Description of gout closures for high-performance blast furnaces with Counter pressure operation is the company brochure: "Our partner is the world -GHH-IHI-Gichtverschluss for high-performance blast furnaces with Counter-pressure operation ", Gutehoffnungshütte Sterkrade Aktiengesellschaft, 4200 Oberhausen-Sterkrade, PO Box 103.

The Japanese Patent Laid-Open No. 02 011 711 describes a different device for banding a blast furnace, with a conveyor belt for the continuous supply of feedstocks (Möller, supplements and predominantly coke as a reducing agent) to a bell-gout closure of the blast furnace. In this device, feeding devices are provided above and inside the bell-gout closure for the task and material distribution of the starting materials, inter alia, on a bell arranged in a buffer bunker. The internal bell-gating closure bell is comprised of an inclined, pivotable chute whose pivot axis is coaxial with the vertical axis of the buffer bunker and the bell. The obliquely arranged chute causes at the outlet of the chute an outward, directed towards the bunker wall material flow.

The German Patent Application No. 2 029 089 relates to a device for filling and distributing the batches for a shaft furnace with a sealed gout bowl. The bottom of the gout bowl forms a large bell, which distributes the batch in the oven shaft. The device has a funnel-shaped rotary distributor arranged above the large bell, which can be locked at the lower end by a small distributor rotary bell. Between the big bell and the distributor rotary bell a small third bell is arranged which has the sealing function. According to this specification, the rotary distributor is activated when the Rotary distributor turned and stopped to abandon the batch on the big bell.

outgoing from this known prior art, it is an object of the invention to create a device with which the problems of material task and material distribution when furnishing a blast furnace, at least can be partially minimized.

The Asked object is with the characterizing features of the claim 1 solved by that the internal feeding device for the small bell of the bell gout closure a funnel-shaped rotary distributor arranged below a stationary feed chute is, with coaxial to the vertical axis of the circular buffer bunker and to the vertical axis of the small bell arranged axis of rotation and one to its axis of rotation and to the centroid its filling cross-section laterally offset vertical outlet opening.

advantageous Embodiments of the invention are specified in the subclaims.

The optimal material distribution to the small bell by the inventive design the internal task device in the form of a rotary distributor allows it, even at blast furnaces with banding this rotary distributor with its advantages in terms to use the gas seal. This gives the opportunity to increase the gout pressure and reduce coke consumption through more efficient gas utilization and increase production output.

These optimal material distribution is thereby by the axis of rotation laterally offset outlet opening achieved the rotary distributor, whereby the starting materials in the rotation of the rotary distributor evenly over the entire cross section of the buffer bunker and thus also over the small bell to be distributed. The outlet opening is as far as the side offset to their axis of rotation, that they are approximately on the seat diameter the small bell is located.

Farther is due to the inventive design of the rotary distributor with a downwardly extending the outlet opening vertical outlet pipe and with the feature that the outlet pipe with a partial length in the funnel-shaped Rotary distributor protrudes, reaches that on this inner piece of pipe, the starting materials damming and getting on the sloping walls of the rotary distributor builds a Schüttgutbscheschung. This bulk soil slope represents not only a simple and effective wear protection the side walls of the rotary distributor, but also favors due to the they brought about friction conditions a largely homogeneous discharge of the input materials during their discharge via the bevel Sidewalls of the Rotary distributor down into the buffer bunker.

In order to the bulk pile also on the different oblique sidewalls build up with a uniform layer height can, is the projecting into the rotary distributor outlet part on the opposite of the flatter side wall of the rotary distributor Side still extended with a half-shell pipe section. By this measure, the Stowage effect on the steeper side walls increased and thus the layer height of the bulk material embankment over the entire circumference of the rotary distributor evened.

Of the Rotary distributor is geometrically designed that he is at each any rotational position with its filling cross section always below the outlet opening the above the rotary distributor arranged stationary task chute or one of these downstream hopper. It follows, that with a round filling cross section the opening radius the filling cross section and according to an angular filling cross section of the distance of his outer edge from its axis of rotation at least the distance between it Filling outlet opening and corresponds to the vertical axis of the circular buffer bunker.

Of the arranged below the fixed task bunk rotary distributor is over inside the Bunkerwand revolving guide rollers and over a guide horizontally supported on the central tube of the gout closure while the vertical support over the Bunker cover is realized.

Of the Drive the rotary distributor by means of suitable drive devices, the on the circumference and / or on the axis of the rotary distributor with this in Active compound stand. When driving the rotary distributor is his Direction of rotation, unless special reasons speak against it, in such a way set that on the north Earth hemisphere in exit direction "right" and on the southern Earth hemisphere in exit direction "left" is. Such a defined direction of rotation has proven to be particularly beneficial for the evening out of produced material distribution in accordance with conducted experiments result.

Further Advantages, features and characteristics of the invention will be described below to exemplary embodiments illustrated in schematic drawing figures explained in more detail.

It demonstrate:

1 a bell-gout closure of a Prior art blast furnace in different working phases in vertical sections,

1a a bell-gout closure of a blast furnace with banding with a erfindungsgmäßen rotary distributor in different phases of work in vertical sections,

2 a round rotary distributor with buffer bunker and feed chute in a perspective schematic representation,

3 a round rotary distributor of 1 .

4 a square rotary distributor.

• • In Phase 1/1 sind alle Absperrorgane geschlossen; das Transportband 5 zur Füllung des ortsfesten Aufgabebunkers 7 steht, da bereits eine Charge Einsatzstoffe 30 eingefüllt ist; auf der großen Glocke 3 befindet sich eine weitere Charge Einsatzstoffe 30.
• • In Phase 1/2 sind nur die beiden Tellerventile 8, 8' geöffnet; die Charge Einsatzstoffe 30 aus dem Aufgabebunker 7 fällt durch den Aufgabetrichter 9 in den Pufferbunker 6 auf die kleine Glocke 2; das Transportband 5 steht.
• • In Phase 1/3 ist nur die große Glocke 3 geöffnet; die Charge Einsatzstoffe 30 fällt in den Hochofen 4; die Charge Einsatzstoffe 30 aus dem Aufgabebunker 7befindet sich komplett im Pufferbunker 6 auf der kleinen Glocke 2; das Transportband 5 steht.
• • In Phase 1/4 ist nur die kleine Glocke 2 geöffnet; die Charge Einsatzstoffe 30 fällt aus dem Pufferbunker 6 der kleinen Glocke 2 auf die große Glocke 3; das Transportband 5 läuft und füllt den Aufgabebunker 7.
• • In Phase 1/5 sind wieder alle Absperrorgane geschlossen; die Charge Einsatzstoffe 30 des Pufferbunkers 6 der kleinen Glocke 2 befindet sich komplett auf der großen Glocke 3; das Transportband 5 läuft und füllt weiter den Aufgabebunker 7.

For a better understanding of the subject invention is in 1 in five separate phases of work a bell gout closure 1 a blast furnace 4 illustrated with band coverage according to the prior art. The top of the blast furnace 4 arranged bells gout closure 1 consists with its most important construction parts of several stacked material bunkers with interposed shut-off devices. These are two poppet valves from top to bottom 8th . 8th' , the little bell 2 and the big bell 3 ,

• • In phase 1/1, all shut-off devices are closed; the conveyor belt 5 for filling the stationary task bunker 7 there is already a batch of starting materials 30 is filled in; on the big bell 3 there is another batch of starting materials 30 ,
• • In phase 1/2 are only the two poppet valves 8th . 8th' open; the batch feedstocks 30 from the task bunker 7 falls through the feeding funnel 9 in the buffer bunker 6 on the little bell 2 ; the conveyor belt 5 stands.
• • In phase 1/3 is just the big bell 3 open; the batch feedstocks 30 falls into the blast furnace 4 ; the batch feedstocks 30 from the task bunker 7 is completely in the buffer bunker 6 on the little bell 2 ; the conveyor belt 5 stands.
• • In phase 1/4 is only the small bell 2 open; the batch feedstocks 30 falls out of the buffer bunker 6 the little bell 2 on the big bell 3 ; the conveyor belt 5 runs and fills the task bunker 7 ,
• • In phase 1/5 all shut-off valves are closed again; the batch feedstocks 30 of the buffer bunker 6 the little bell 2 is completely on the big bell 3 ; the conveyor belt 5 runs and fills the task bunker 7 ,

In 1a is the function of the rotary distributor according to the invention in a similar manner as in 1 shown.

• • In Phase 1/1 befinden sich keine Materialien innerhalb des Glocken-Gicht-Verschlusses 1; beide Glocken 2 und 3 befinden sich in der Schließstellung; das Absperrorgan 25' der Aufgabeschurre 25 ist geschlossen.
• • In Phase 1/2 werden Einsatzstoffe 30 über das Transportband 5 von oben in die Aufgabeschurre 25 eingefüllt und gelangen von dort über den Drehverteiler 10 auf die kleine Glocke 2 im Pufferbunker 6.
• • In Phase 1/3 werden keine Einsatzstoffe 30 in den Glocken-Gicht-Verschluss 1 eingefüllt; das Absperrorgan 25' der Aufgabeschurre 25 ist nun wieder geschlossen; die kleine Glocke 2 ist geöffnet und die Einsatzstoffe 30 fallen auf die große Glocke 3.
• • In Phase 1/4 ist die große Glocke 3 geöffnet und die Einsatzstoffe 30 fallen in den Hochofen 4; die kleine Glocke 2 ist nun geschlossen und der Pufferbunker 6 wird mit einer weiteren Charge wie bei Phase 1/2 über den Drehverteiler 10 aufgefüllt.

The bells gout closure 1 the blast furnace 4 consists in this application example from top to bottom of a task chute 25 with a shut-off device 25 ' , one inside the buffer bunker 6 below the obturator 25 ' and above the bell 2 arranged rotary distributor 10 with feed tube 11 and finally including the blast furnace 4 here above big bell 3 ,

• • In phase 1/1, there are no materials within the bell-gout closure 1 ; both bells 2 and 3 are in the closed position; the obturator 25 ' the task chute 25 is closed.
• • In phase 1/2, feedstocks are used 30 over the conveyor belt 5 from the top into the task chute 25 filled and from there via the rotary distributor 10 on the little bell 2 in the buffer bunker 6 ,
• • In phase 1/3, no starting materials are used 30 in the bells gout closure 1 filled; the obturator 25 ' the task chute 25 is now closed again; the little bell 2 is open and the starting materials 30 fall on the big bell 3 ,
• • In phase 1/4 is the big bell 3 opened and the starting materials 30 fall into the blast furnace 4 ; the little bell 2 is now closed and the buffer bunker 6 comes with another batch as in phase 1/2 on the rotary distributor 10 refilled.

In 2 these construction parts involved here are once again shown schematically.

Inside the round buffer bunker 6 with below arranged small bell 2 is located above with distance to the small bell 2 a round inventive rotary distributor 10 whose rotation axis 15 coaxial with the bunker axis 16 of the round buffer bunker 6 coincides. Laterally offset to its axis of rotation 15 and the centroid 14 the filling cross section 13 (see also 3 ) is located in the rotary distributor 10 a vertical outlet opening 11 ' that go down and in through an outlet pipe 11 is extended. This lateral displacement of the outlet opening 11 ' causes the starting materials 30 depending on the rotational speed of the rotary distributor 10 and the rate of discharge of the starting materials 30 in the desired manner homogeneously and evenly on the small bell 2 and within the buffer bunker 6 up to its side walls 18 be distributed. The discharge speed is determined by the friction conditions on the oblique side walls of the rotary distributor 10 and their inclination.

The horizontal support of the rotary distributor 10 at the central tube of the bell gout closure 1 is schematic through a guide 17 turned records. The other horizontal and vertical supports and the drive device of the rotary distributor 10 are not shown.

Above the rotary distributor 10 there is a task chute 25 with an outlet opening 26 , which can be closed by a shut-off (the obturator is not shown). The rotation axis 15 and the filling cross section 13 of the rotary distributor 10 are arranged or designed so that at each rotational position of the rotary distributor 10 a part of the filling cross section 13 below the outlet opening 26 is located so that no material on the rotary distributor 10 over into the buffer bunker 6 falls.

In the 3 and 4 Possible embodiments of a rotary distributor according to the invention are shown schematically in an individual representation. The in 3 illustrated rotary distributor 10 of the 2 has a round filling cross section 13 and a lower round outlet opening 11 ' , The outlet opening 11 ' is down and in through a spout 11 extended. The extension of the outlet pipe 11 inside causes the starting materials 30 in the out of the oblique sidewalls 19 . 19 ' and the inwardly projecting spout part gussets formed the starting materials 30 (the starting materials are not shown) damming and on the sloping side walls 19 to form a bulk cargo embankment.

By the lateral displacement of the outlet opening 11 ' opposite the centroid 14 (Circle center) of the filling cross section 13 is the rotary distributor 10 with uneven sloping side walls 19 . 19 ' designed so that on the steeper side walls 19 ' less material will be deposited than on the flatter side walls 19 , In order to prevent such unevenness in the formation of Schüttgutböschung is at the flatter side wall 19 of the rotary distributor 10 opposite side 19 ' the outlet pipe 11 with a half-shell pipe part 12 lengthened inwards so that more material is retained here and the bulk material embankment is uniformed overall.

In 4 as another possible training variant is a square rotary distributor 20 shown. Again, the outlet opening 11 ' laterally opposite the centroid 24 the filling cross section 23 staggered so that also different sloping side walls 29 . 29 ' result. For the same reasons as the round rotary distributor described above 10 is therefore also the angular rotary distributor 20 the outlet pipe 11 inside with a half-shell pipe part 12 on the steep side wall 29 ' extended.

The axis of rotation of this angular rotary distributor 10 (the rotation axis is not drawn) runs so that the side edges 22 the different oblique sidewalls 29 . 29 ' always below the outlet opening above the rotary distributor 10 arranged bunkers or funnels are located so that no material on the rotary distributor 10 over to the little bell 2 can fall. The axis of rotation does not necessarily have to be due to the center of gravity 24 the filling cross section 23 be guided.

The Invention is not limited to the illustrated embodiments, but in terms of geometry and design of the rotary distributor and Its arrangement above the small bell variable to prevailing Customizable conditions.

LIST OF REFERENCE NUMBERS

1

Bell-gout closure

2

small Bell jar

3

big bell

4

blast furnace

5

conveyor belt

6

buffer bin

7

stationary feed hopper

8th, 8th'

poppet valves

9

hopper

10

round turntable

11

outlet pipe

11 '

Outlet opening of 11

12

half-shell pipe part

13

filling cross of 10

14

Centroid from 13

15

axis of rotation

16

bunker axis

17

Leadership to horizontal support

18

bunker wall

19 19 '

sloping walls

20

square rotary distributor

22

side edges

23

filling cross from 20

24

Centroid from 23

25

chute

25 '

shutoff from 25

26

Outlet opening of 25

29 29 '

sloping sidewall

30

feedstocks

Claims (11)

Apparatus for strip coating of a blast furnace operated with an increased counterpressure (US Pat. 4 ), with a conveyor belt ( 5 ) for the continuous supply of feedstocks consisting of Möller, aggregates and predominantly coke as reducing agent ( 30 ) to the bell-gout closure ( 1 ) of the blast furnace ( 4 ) and with feeders above and inside the bell-gout closure ( 1 ) on the task and material distribution of Starting materials ( 30 ) on top of each other in a buffer bunker ( 6 ) arranged bells ( 2 . 3 ) of different sizes, characterized in that the internal feeding device for the small bell ( 2 ) of the bell gout closure ( 1 ) below a fixed feed chute ( 25 ) arranged funnel-shaped rotary distributor ( 10 . 20 ), coaxial with the vertical axis ( 16 ) of the round buffer bunker ( 6 ) and the vertical axis of the small bell ( 2 ) arranged rotational axis ( 15 ) and with an axis of rotation ( 15 ) and the centroid ( 14 . 24 ) of its filling cross-section ( 13 . 23 ) laterally offset vertical outlet opening ( 11 ' ). Apparatus according to claim 1, characterized in that the outlet opening ( 11 ' ) as far as the axis of rotation ( 15 ) of the rotary distributor ( 10 . 20 ) is arranged so that they are approximately in the middle between the vertical bunker axis ( 16 ) and the lateral bunker wall ( 18 ) is located. Apparatus according to claim 1 or 2, characterized in that the outlet opening ( 11 ' ) with a vertical outlet pipe ( 11 ) is extended downwards. Apparatus according to claim 3, characterized in that the outlet pipe ( 11 ) with its upper end so far into the rotary distributor ( 10 . 20 ) protrudes that on the sloping side walls of the funnel-shaped rotary distributor ( 10 . 20 ) forms a Schüttgutböschung. Apparatus according to claim 4, characterized in that in the rotary distributor ( 10 . 20 ) projecting part of the outlet pipe ( 11 ) on the flatter side wall ( 19 . 29 ) of the rotary distributor ( 10 . 20 ) opposite side ( 19 ' . 29 ' ) with a half-shell pipe part ( 12 ) is extended. Device according to one or more of claims 1 to 5, characterized in that the filling cross section ( 13 ) of the rotary distributor ( 10 ) is round and the opening radius of the filling cross section ( 13 ) at least the distance between the outlet opening ( 26 ) of a fixed task chute ( 25 ) and the vertical axis ( 16 ) of the round buffer bunker ( 6 ) corresponds. Device according to one or more of claims 1 to 5, characterized in that the filling cross section ( 23 ) of the rotary distributor ( 20 ) is angular and the distance of the outer edge ( 22 ) of its side surfaces ( 29 . 29 ' ) from its axis of rotation at least the distance between the outlet opening ( 26 ) of a fixed task chute ( 25 ) and the vertical axis ( 16 ) of the round buffer bunker ( 6 ) corresponds. Device according to one or more of claims 1 to 7, characterized in that the rotary distributor ( 10 . 20 ) above the bunker wall ( 18 ) arranged guide rollers and a guide ( 17 ) at the central tube of the bell-gout closure ( 1 ) is supported horizontally. Device according to one or more of claims 1 to 8, characterized in that the rotary distributor ( 10 . 20 ) is connected to its vertical support with the bunker lid. Apparatus according to claim 8 or 9, characterized in that the rotary distributor ( 10 . 20 ) is in operative connection with at least one drive device on its axis and / or on its circumference. Apparatus according to claim 10, characterized in that the direction of rotation of the rotary distributor ( 10 . 20 ) in the northern hemisphere in the exit direction "right" and in the southern hemisphere "left".

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