EP1387137B1 - Apparatus for charging of a blast furnace via conveyor belt - 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 invention relates to a device for Bandbegichtung a operated with an increased back pressure blast furnace, with a conveyor belt for the continuous supply of Möller, aggregates and predominantly coke as a reducing agent feedstocks for bell-gout closure of the blast furnace and with feeders above and within the Bell Gout closure for the task and material distribution of the starting materials on the one above the other in a buffer bunker arranged bells of different sizes.

The blast furnace feedstock accounts for 2.0 to 2.5 times the weight of pig iron production. Characteristics of the here required unloading, bunker, feeder and Beschichtungsanlagen are therefore high performance with the greatest possible mechanization. In this case, means of delivery are understood to mean transport devices which transport the starting materials to the upper end of the blast furnace for the Gicht catch arranged 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, the feeds are dumped at the upper end of the Gessverschlusses in an upper funnel, which is closed at the bottom by an upper small bell. By lowering the small bell that falls filled material into a large hopper located below, which is closed by a lower large bell.

The treatment greatly influences the processes taking place in the blast furnace. In the first place it is decisive how the feedstock consisting of coarse material and fine material is distributed over the furnace cross-section, because the fines offer a considerably greater resistance to rising gases. When greasing the material slips over sloping surfaces; The result is a pouring ring of conical cross-section, with a separation takes place: coarse material is then outside and the fines inside.

Due to the increased environmental requirements and the need to operate the furnace under optimal operating conditions, such as increased back pressure, modification of many existing gas closures 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 seat ring, as well as the equipment with a pressure equalization system. The resulting problem is the even distribution of the starting materials on the small bell or in the material bunker. The layer distributors previously used for this purpose made no special demands on the gas seal in unpressurized operation of the blast furnace. Main problems of the counter-pressure operation and thus cost factors are the seals of the moving parts of the blast furnace, especially in a continuous supply of material over a longer period in a Bandbegichtung, as well as the wear of 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 available in 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 Publication 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 within 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.

Based on this known prior art, it is an object of the invention to provide a device with which the problems of material application and material distribution in the treatment of a blast furnace can be minimized at least partially.

The object is achieved with the characterizing features of claim 1, characterized in that the internal feeding device for the small bell of the bell-gout closure is a arranged below a stationary task chute funnel-shaped rotary distributor, coaxial with the vertical axis of the circular buffer bunker and the vertical axis the small bell arranged rotational axis and with a to its axis of rotation and the centroid of its Einfüllquerschnitts laterally offset vertical outlet opening.

Advantageous embodiments of the invention are specified in the subclaims.

The optimal distribution of material on the small bell by the inventive design of the inner feeder in the form of a rotary distributor allows to use this rotary distributor with its advantages in terms of gas seal even with blast furnaces with band coverage. This provides the opportunity to increase the gout pressure and to reduce coke consumption and increase production efficiency through more efficient gas utilization.

This optimal material distribution is achieved by the offset to the axis of rotation laterally offset outlet opening of the rotary distributor, whereby the starting materials in the rotation of the rotary distributor uniformly over the entire cross section of the Puffer bunker and thus be distributed over the small bell. The outlet opening is as far as offset laterally to its axis of rotation that it is located approximately on the seat diameter of the small bell.

Furthermore, it is achieved by the inventive design of the rotary distributor with the outlet opening extending downward vertical outlet pipe and with the feature that the outlet pipe with a partial length in the funnel-shaped rotary distributor, that accumulate on this inner pipe section, the feedstock and on the oblique Walls of the rotary distributor builds a Schüttgutbschschung. This Schüttgutböschung not only provides a simple and effective wear protection of the side walls of the rotary distributor, but also favors due to the frictional conditions brought about by them a largely homogeneous discharge of the starting materials in their discharge through the oblique side walls of the rotary distributor down into the buffer bunker.

Thus, the bulk material embankment can also build on the different oblique side walls with a uniform layer height, the projecting into the rotary distributor outlet part on the opposite side of the flatter side wall of the rotary distributor side is still extended with a half-shell pipe part. By this measure, the accumulation effect is increased at the steeper side walls and thus made uniform the layer height of Schüttgutböschung over the entire circumference of the rotary distributor.

The rotary distributor is geometrically designed so that it is always located at any rotational position with its filling cross section below the outlet opening of the above the rotary distributor arranged stationary task chute or one of these downstream hopper. It follows that in the case of a round filling cross section, the opening radius of the filling cross section and, correspondingly, in the case of a square filling cross section, the distance of its outer edge from its axis of rotation corresponds at least to the distance between this filling outlet opening and the vertical axis of the circular buffer bunker.

The arranged below the fixed task bunk rotary distributor is supported on the inside of the bunker wall rotating guide rollers and a guide on the central tube of the Gichtverschlusses horizontal, while the vertical support is realized on the bunker cover.

The rotary distributor is driven by means of suitable drive devices which are operatively connected to the rotary distributor on the circumference and / or on the axis thereof. When driving the rotary distributor, its direction of rotation, unless there are special reasons against it, set such that it is in the northern hemisphere in the exit direction "right" and in the southern hemisphere in the outward / upward "left". Such a defined direction of rotation has proven to be particularly advantageous for the homogenization of the material distribution produced in accordance with experiments carried out.

Further advantages, features and characteristics of the invention are explained in more detail below with reference to exemplary embodiments illustrated in schematic drawing figures.

Fig. 1

einen Glocken-Gicht-Verschluss eines Hochofens mit Bandbegichtung nach dem Stand der Technik in verschiedenen Arbeitsphasen in Vertikalschnitten,

Fig. 1 a

einen Glocken-Gicht-Verschluss eines Hochofens mit Bandbegichtung mit einem erfindungsgmäßen Drehverteiler in verschiedenen Arbeitsphasen in Vertikalschnitten,

Fig. 2

einen runden Drehverteiler mit Pufferbunker und Aufgabeschurre in perspektivischer schematisierter Darstellung,

Fig. 3

einen runden Drehverteiler der Fig. 1,

Fig. 4

einen eckigen Drehverteiler.

Show it:

Fig. 1

a bell-gout closure of a prior art blast furnace with banding in different working phases in vertical sections,

Fig. 1 a

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

Fig. 2

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

Fig. 3

a round rotary distributor of Fig. 1 .

Fig. 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 7 befindet 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 FIG. 1 in five individual phases of operation, a bell-gout closure 1 of a blast furnace 4 with Bandbegichtung shown in the prior art. The top of the blast furnace 4 arranged bell-gout closure 1 consists with its main construction parts of several superimposed material bunkers with interposed shut-off. These are from top to bottom two poppet valves 8, 8 ', the small bell 2 and the big bell 3.

• In phase 1/1 all shut-off valves are closed; the conveyor belt 5 is to fill the stationary task bunker 7, since a batch of feedstock 30 is already filled; on the large bell 3 is another batch of feedstock 30.
• In phase 1/2, only the two poppet valves 8, 8 'are opened; the charge feedstocks 30 from the hopper 7 falls through the hopper 9 in the buffer bunker 6 on the small bell 2; the conveyor belt 5 is.
• In phase 1/3, only the big bell 3 is open; the batch feedstocks 30 falls into the blast furnace 4; the charge feedstocks 30 from the hopper 7th is completely in the buffer bunker 6 on the small bell 2; the conveyor belt 5 is.
• In phase 1/4, only the small bell 2 is open; the batch feedstocks 30 falls from the buffer bunker 6 of the small bell 2 on the large 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 of the small bell 2 is completely on the large bell 3; the conveyor belt 5 runs and fills the task bunker 7 further.

In FIG. 1 a is the function of the rotary distributor according to the invention in a similar manner as in Fig. 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 bell-gout closure 1 of the blast furnace 4 consists in this application example from top to bottom of a task chute 25 with a shut-off 25 ', a within 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 final 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 'of the task chute 25 is closed.
• In phase 1/2 feedstocks 30 are filled via the conveyor belt 5 from above into the Aufgabeschurre 25 and from there via the rotary distributor 10 on the small bell 2 in the buffer bunker. 6
• In phase 1/3 no feedstocks 30 are filled into the bell gout closure 1; the obturator 25 'of Aufgabeschurre 25 is now closed again; the small bell 2 is opened and the starting materials 30 fall onto the large bell 3.
• In phase 1/4, the large bell 3 is opened and the feedstocks 30 fall into the blast furnace 4; the small bell 2 is now closed and the buffer bunker 6 is filled with another batch as in phase 1/2 on the rotary distributor 10.

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

Within the circular buffer bunker 6 with a lower bell 2 arranged at the bottom there is a round rotary distributor 10 according to the invention at a distance from the small bell 2, the axis of rotation 15 of which coincides coaxially with the bunker axis 16 of the round buffer bunker 6. Laterally offset to its axis of rotation 15 and the centroid 14 of the filling cross section 13 (see Fig. 3 ) is located in the rotary distributor 10, a vertical outlet opening 11 ', which is extended downwardly and inwardly by an outlet pipe 11. This lateral displacement of the outlet opening 11 'causes the feedstocks 30 are distributed in a desired manner homogeneously and evenly on the small bell 2 and within the buffer bunker 6 to its side walls 18 in dependence on the rotational speed of the rotary distributor 10 and the discharge speed of the feedstock 30 , The discharge speed is determined by the friction conditions on the oblique side walls of the rotary distributor 10 and the inclination.

The horizontal support of the rotary distributor 10 on the central tube of the bell-gout closure 1 is shown schematically by a guide 17. The remaining horizontal and vertical supports and the drive device of the rotary distributor 10 are not shown.

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

In the FIGS. 3 and 4 Possible embodiments of a rotary distributor according to the invention are shown schematically in an individual representation. The in Fig. 3 shown rotary distributor 10 of Fig. 2 has a round filling cross section 13 and a lower round outlet opening 11 '. The outlet opening 11 'is extended downwardly and inwardly by an outlet pipe 11. The extension of the outlet pipe 11 inwardly causes the feedstock 30 in the gusset formed from the oblique side walls 19, 19 'and the inwardly projecting spout part dehumidify the starting materials 30 (the starting materials are not shown) and on the oblique side walls 19 a Train bulkhead slope.

By the lateral displacement of the outlet opening 11 'relative to the centroid 14 (circle center) of the Einfüllquerschnitts 13 of the rotary distributor 10 is formed with unequal oblique side walls 19, 19', so that on the steeper side walls 19 'will deposit less material than on the flatter side walls 19. To prevent such unevenness in the formation of Schüttgutböschung is at the flatter side wall 19 of the Rotary distributor 10 opposite side 19 'extends the outlet pipe 11 with a half-shell pipe part 12 inwards, so that here more material retained and the Schüttgutböschung is made uniform overall.

In FIG. 4 is shown as another possible training variant a square rotary distributor 20. Again, the outlet opening 11 'is laterally offset relative to the centroid 24 of the Einfüllquerschnitts 23, so that also different oblique side walls 29, 29' result. For the same reasons as in the round rotary distributor 10 described above, therefore, the outlet pipe 11 is also extended inwardly with a half-shell pipe part 12 on the steep side wall 29 'in the angular rotary distributor 20.

The axis of rotation of this angular rotary distributor 10 (the axis of rotation is not shown) runs so that the side edges 22 of the different oblique side walls 29, 29 'are always below the outlet opening of a arranged above the rotary distributor 10 bunker or hopper, so that no material on Rotary distributor 10 can fall over on the small bell 2. The axis of rotation need not necessarily be guided by the centroid 24 of the Einfüllquerschnitts 23.

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

LIST OF REFERENCE NUMBERS

1

Bell-gout closure

2

little bell

3

big bell

4

blast furnace

5

conveyor belt

6

buffer bin

7

stationary task bunker

8, 8 '

poppet valves

9

hopper

10

round turntable

11

outlet pipe

11 '

Outlet opening of 11

12

half-shell pipe part

13

Filling cross section of 10

14

Centroid of 13

15

axis of rotation

16

bunker axis

17

Guide for horizontal support

18

bunker wall

19, 19 '

sloping walls

20

angular rotary distributor

22

side edges

23

Filling cross section of 20

24

Centroid of 23

25

chute

25 '

Shut-off valve of 25

26

Outlet opening of 25

29, 29 '

sloping sidewall

30

feedstocks

Claims (10)

1. A device for belt-charging a blast furnace (4) operated with increased counter-pressure, with a conveyer belt (5) for continuously introducing the feedstocks (30) consisting of burden, aggregates and primarily coke as a reducing agent, into the bell-throat closure (1) of the blast furnace (4) and with feeder devices above and inside the bell-throat closure (1) for feeding and for the material distribution of the feedstocks (30) on the bells (2, 3) of different sizes, positioned over each other in a buffer bin (6) characterized in that the inner feeder device for the small bell (2) of the bell-throat closure (1) is a hopper-like rotary distributor (10, 20) positioned under a fixed feeding shute (25), with an axis of rotation (15) positioned coaxially relatively to the vertical axis (16) of the round buffer bin (6) and relatively to the vertical axis of the small bell (2) and with an outlet aperture (11') laterally shifted relatively to its axis of rotation (15) and relatively to the surface centre of gravity (14, 24) of its inlet cross-section (13, 23), which outlet aperture (11') is extended downwards with a vertical outlet tube (11).
2. The device according to claim 1, characterized in that the outlet aperture (11') is positioned laterally shifted relatively to the axis of rotation (15) of the rotary distributor (10, 20) to the extent that it is located approximately in the middle between the vertical bin axis (16) and the lateral bin wall (18)
3. The device according to claim 1 or 2, characterized in that the outlet tube (11) protrudes with its upper end in the rotary distributor (10, 20) to the extent that a slope of bulk material is formed on the inclined sidewalls of the hopper-like rotary distributor (10, 20)
4. The device according to claim 3, characterized in that the portion of the outlet tube (11) protruding into the rotary distributor (10, 20) on the slide (19', 29') opposite to the flatter sidewall (19, 29) of the rotary distributor (10, 20) is extended with a half-shell tube portion (12)
5. The device according to one or more of claims 1 to 4, characterized in that the inlet cross-section (13) of the rotary distributor (10) is round and the aperture radius of the inlet cross-section (13) corresponds to at least the distance between the outlet aperture (26) of a fixed feeding shute (25) and the vertical axis (16) of the round buffer bin (6)
6. The device according to one or more of claims 1 to 4, characterized in that the inlet 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 corresponds to at least the distance between the outlet aperture (26) of a fixed feeding shute (25) and the vertical axis (16) of the round buffer bin (6)
7. The device according to one or more of claims 1 to 6, characterized in that the rotary distributor (10, 20) is supported horizontally via guide rollers interiorly positioned on the bin wall (18) and via a guide (17) on the central tube of the bell-throat closure (1)
8. The device according to one or more of claims 1 to 7, characterized in that the rotary distributor (10, 20) is connected to the bin lid for its vertical support
9. The device according to claim 7 or 8, characterized in that the rotary distributor (10, 20) on its axis and/or on its periphery is operationally connected to at least one driving device
10. Use of the device according to any one or several of claims 1 to 9, characterized in that the direction of rotation of the rotary distributor (10, 20) is "towards the right" on the northern hemisphere and "towards the left" on the southern hemisphere in the outlet direction.

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