DE29721768U1 - Pan circuit system for sintering materials - Google Patents

Description

RICHTER, WERDERMANN & 13ERBAULET

EUROPEAN PATENT ATTORNEYS ■ PATENT ATTORNEYS

EUROPEAN TRADEMARK ATTORNEYS

HAMBURG · BERLIN

DIPL.-ING. JOACHIM RICHTER ■ BERLIN DIPL.-ING. HANNES GERBAULET ■ HAMBURG DIPL.-ING. FRANZ WERDERMANN · - 1986

NEW WALL IO KURFÜRSTENDAMM 216

2O354 HAMBURG IO719 BERLIN

'S (O4O) 34 OO 45/34 OO 56 S (O3O) S 82 74 31 FAX (O4O) 35 24 15 FAX (O3O) 8 82 32

IN OFFICE SHARING WITH MAINITZ & MAINlTZ LAWYERS ■ NOTARIES

YOUR SIGN OUR SIGN HAMBURG

YOUR FILE OUR FILE

P 97656 III 5932 08.12.1997

Applicant: PLANTENER, Olaf
Haidkoppel 28

23883 Brunsmark / DE

Title: Ladle system for sintering materials.

Description

The application relates to a circular ladle system for sintering materials with circular segment-like wind boxes arranged in a ring around a vertical central axis with ladle-like grates, a feeding device with a bulk material feed device for a grate coating and a bulk material feed device for a sinter mixture and a discharge for the finished sintered product.

DE 26 04 798 B2 describes a sintering ring furnace with a flat rotating grate, which has a circular ring-shaped, rotating furnace bed formed by several wind boxes connected to one another on the side walls, each with a circular segment-shaped round surface and fire grates arranged on them. The furnace bed can be set in rotation by a drive device, for which purpose the sintering ring furnace rests on a plurality of wheels that run in a ring rail. The sintering ring furnace has a central ring chamber, which consists of a number of compartments arranged concentrically within the circular ring-shaped furnace bed, corresponding to a number of wind boxes, each compartment of which is connected to a wind box via a horizontal connecting line. The sintering ring furnace is fed with raw material via a feeding device, which is arranged stationary above the circular ring-shaped furnace bed. The fully loaded furnace bed rotates during operation until a pulling device is reached, whereby the ignited raw material is gradually sintered by the suction wind flowing through it in accordance with the rotation of the sintering ring furnace and the resulting sintered material is finally removed from the sintering ring furnace by means of an emptying device. The disadvantage of this sintering ring furnace is that the entire circular ring grate surface with a correspondingly large mass must be rotated until finally all of the sintered material is sintered over a rotation angle of 3 60°, after which it is completely emptied.

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This results in a discontinuous working method.

DE 22 27 019 describes a circular suction sintering machine with a rotating housing that is designed in the form of two vertical, coaxially arranged cylinders, which are connected at the top by radial cross bars that serve as grate supports and by inclined guide walls. Between the guide walls there are separate suction chambers, in the upper part of which grate bars are laid on the grate supports, forming a ring-shaped grate. Above the effective grate surface, where the material treatment processes (sintering) take place, there are hoods with fireproof lining and fittings for supplying fuel and for supplying air to the burners. Above the rotating housing, on stationary supports, a discharge device with a wedge-shaped knife is mounted, by means of which the grained and cooled pellets can be discharged from the grate into chutes. When the ring grate is fed with pellets, the frame is rotated. After the rotating device has stopped, each burner is ignited in the opposite order to the rotation of the machine, whereby the pellets are pre-dried, heated and burned one after the other while regulating the temperature and heat control as well as the vacuum and air conditions. After the burning process is complete, the pellets are

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cooled by air and discharged via the knife mentioned. This machine also works discontinuously.

The object of the present invention is to create a ladle circuit system for sintering materials of the type mentioned above, with which a higher processing speed can be achieved. The ladle circuit system should be structurally simple, with all moving parts, in particular the motor-driven parts, preferably being as light as possible.

This object is achieved by the features characterized in claim 1.

According to this invention, the ladle circuit system has a traveling platform that can be rotated about a central axis with at least one bulk material feed device for a grate coating, at least one bulk material feed device for a sinter mixture and an ignition hood, wherein the bulk material feed device can be positioned around the ignition hood one after the other over each individual grate by rotating the traveling platform and the sintered materials can be transferred from the grate to a conveying device.

In contrast to the known sintering furnaces, the circular segment-like wind boxes are arranged stationary. The rotating platform, which is preferably designed as a rotating arm, is connected to the bulk material feeder.

feeding device for the grate coating, e.g. is moved over a first pan and filled with the grate coating. In the next step, the platform is moved further by an angle of rotation until the bulk material feeding device for the sinter mixture is located above the first pan and can be filled. The bulk material feeding device for the grate coating has meanwhile moved so far that it is located above a second pan and fills it. In the next step, the platform is again moved further by an angle of rotation until the bulk material feeding device for the grate coating comes to a stop above a third pan and fills it with rust coating. The bulk material feeding device for the sinter mixture is located above the second pan and fills it; the ignition hood is located above the first pan and ignites the sinter mixture. The negative pressure is regulated by a flap. In the next step, the platform of the ladle circuit system is again moved by a certain angle of rotation until the bulk material feed device for the grate coating is located above a fourth ladle and fills it. The bulk material feed device for the sinter mixture fills the third ladle and the ignition hood ignites the second ladle. The bulk material feed devices arranged in the platform of the ladle circuit system are fed by endless conveyor belts, which can also be designed as weighing belts.

The chassis preferably has two bulk feed devices connected to respective bunkers, which can be designed in particular as endless conveyor belts. This enables the successive feeding of a grate coating and the sinter mixture in each wind box. With two bulk material feeding devices, the first wind box grate is fed with grate coating, after further rotation of the platform with sinter mixture via the second feed device, while the grate next to it is already fed via the first bulk material feeding device. After subsequent further rotation of the platform, the burners of the ignition hood are ignited. The platform can thus carry out three different operations simultaneously, in which adjacent wind boxes or pans are fed with a first bulk material (grate coating), the other wind box with the second bulk material (sinter mixture) and the third wind box or pan, already filled with grate coating and sinter mixture, is exposed to the firing process.

According to a further embodiment of the invention, the bulk material feed device for grate deposits is designed in such a way that the grate deposits fall in a metered manner via the weighing belt onto a window plate. The resulting cone of material is levelled by a vibrator located on the window plate. The window plate then moves up and the grate deposits fall through the cones with their tips pointing upwards onto the grate. Due to the arrangement

of the tube cones with their upward-pointing tips several small cones are formed on the grate, the tips of which are levelled by the addition of sinter mixture. The cone bodies are arranged directly under the slide.

A further embodiment of the invention provides that the bulk material feed device for the sinter mixture is designed in such a way that the sinter mixture falls into a funnel in doses via a weighing belt and is fed to a distributor by a rotating knife and from there into the pan. Below the distributor there is a smoothing scraper that smooths the surface of the sinter mixture. Here too, as with the grate coating, the layer height can be determined via the weighing belt. Further feeding to the weighing belt is interrupted when the layer height is reached. The weighing belt can also be controlled via sensors installed in the pan.

To regulate the pressure conditions and the wind chamber atmosphere, each wind box is equipped with a vacuum control flap.

According to a further embodiment of the invention, each wind box is provided with a pan-like grate and a preferably closed base, both of which can be pivoted about a horizontal axis, so that after pivoting the grate and the base, the finished sintered product can fall downwards.

Preferably, the discharge funnel is designed in such a way that it can receive the discharged, fully sintered material from all pans. For this reason, the upper diameter of the funnel corresponds approximately to the diameter resulting from the outer periphery of the wind boxes arranged in a circular segment.

The invention further provides an embodiment according to which a dosing device for the bulk material is provided at the end of each bulk material feeding device on the platform. In particular, a first dosing device for feeding the grate coating can be provided, which consists of a shaft with a horizontally movable slide arranged on the floor. The second dosing device has a chamber that is delimited at the top and bottom by horizontally operable slides. After the upper slide is opened, sinter mixture falls onto the lower slide, after which the upper slide is closed and the lower slide is opened to feed the sinter material.

In order to ensure an optimal rust coating, according to a further development of the invention, an arrangement of several conical bodies with upwardly directed tips is provided in the shaft of the rust coating dosing device, preferably below the slide. These conical bodies cause the rust coating to fall out of the pan-like grate of the wind box in such a way that

A further improvement in the rust deposit application is achieved if the slide or the lower slide of the dosing device is connected to a vibrating or swinging device. When the slide is closed, the amount of rust deposit accumulating above it can be distributed into a homogeneous layer by shaking or vibrating it. In addition, the slide is preferably designed in such a way that it forms a closed plate in one half and has a window in the other half, the size of which preferably corresponds to the cross-sectional area occupied by the aforementioned conical bodies. The conical bodies are arranged directly under the slide.

To regulate the pressure conditions and the wind chamber atmosphere, each wind box is equipped with a vacuum control flap.

The particular advantages of the ladle circuit system are that the sluice platform can be made lightweight, meaning that fewer demands are placed on the rotary drive. It is also possible to vary the feed quantity during operation without having to make any changes in the meantime. The design of the grate and the wind box floors as swivel flaps also saves the need for slides or other discharge devices. In particular, the ladle circuit system according to the invention ensures a quasi-continuous production process.

If around 20% of the pans fail, sintering can continue on the remaining 80% of the pans, which is particularly advantageous for routine repairs. It is possible to sinter different materials. For example, the first 10 pans can hold ores, the following 8 pans can hold grinding chips, and the following 12 pans can hold mill scale sludge. It must only be ensured that the finished sinter can also be mixed; if not, the discharge must be changed accordingly. As with traveling grates, the pan circuit system according to the invention does not require heavy, complex cast constructions. In homogeneous quantities, small portions can be sintered very well. The circular arrangement of the pans or wind boxes means that the space required is as small as possible. A second pan circuit can be integrated with minor design changes.

Embodiments of the invention are illustrated in the drawings. They show

Fig. 1 a ladle circuit system in cross section,

Fig. 2 is a plan view of the ladle circuit system according to Fig. l,

Fig. 3 a plan view of a pan-like bottom of a wind box,

Fig. 4 a cross-sectional view of this wind box up to the ejection point,

Fig. 5 a schematic cross-sectional view of the filling hopper with a dosing and feeding device in cross section,

Fig. 6 a plan view of a slider,

Fig. 7 the same arrangement according to Fig. 5 in the open state,

Fig. 8 a top view of the pipe cones of the filling device,

Fig. 9 a dosing device for feeding the sintering mixture in the closed state,

Fig. 10 the dosing device according to Fig. 9 during filling,

Fig. 11 the dosing device according to Fig. 9 during the dosing process,

Fig. 12 the dosing device during the loading of a pan,

Fig. 13 is a schematic perspective view of a loosening screen,

Fig. 14 a corresponding view of the dosing device according to Fig. 11 with changed dosing quantity ,

Fig. 15 a partial cross-sectional view of the ladle circuit system with the feeding and ignition device in different process stages.

Fig. 16 shows a diagrammatic view of a filling device for the sinter mixture for the wind boxes or pans of the pan circuit system,

Fig. 17 shows a diagrammatic view of an upper bulk material distributor of the filling device according to Fig. 16 and

Fig. 18 shows a diagrammatic view of a lower bulk material distributor with a smooth scraper of the filling device according to Fig. 16,

As can be seen from Fig. 1 and 2, several wind boxes 1 are arranged in a circular ring to form a pan system 100, each of which has a pan 2 designed as a grate. A discharge funnel 12 is arranged below the wind boxes, which collects the material that falls after the grate 8 and the wind box base 9 are pivoted. If necessary, the folding grate and the wind box base can be connected to one another via a rod 10 in such a way that pivoting movements are coordinated and coupled.

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run. Alternatively, it is also possible to use separate adjustment devices instead of a single adjustment device 14 (Fig. 4) for both foldable parts 8, 9. Above the ring-shaped wind boxes, a mobile platform 35 is provided, which is designed as a chassis and can be moved so as to rotate around the vertical center axis 3. This mobile platform 35 is equipped with wheels 5 that run on I-chassis supports 13. The mobile platform 35 carries two bulk material feed devices 15, 25 for the grate coating and for the sinter mixture, which comprise conveyor belts 43 that can be filled with respective storage bunkers 41 and 42 for the bulk materials 15a, 15b (sinter mixture, grate coating). The functionality of the rotating mobile platform can essentially be seen in Fig. 2. The platform has an extension that makes it possible to carry out a grate coating feed 15a over a first pan and a sinter mixture feed 25a over the adjacent pan and to operate the ignition hood 37 or the burner at the same time as the aforementioned bulk material feeds. As can already be seen in Fig. 1, the fully sintered material can fall into the hopper 12 in the direction of a sieve 38 after the flaps 8 and 9 have been opened, from where it can be separated via further conveyor belts 44 and 45. Each wind box 2 is also equipped with a vacuum control flap 4. If necessary, further conveyor belts 46 and storage containers 47 and 48 are required to fill the bunkers 41 and 42 in the manner shown in Fig. 1.

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Fig. 3 and 4 show detailed views of the structure of a wind box 1 in which a pan 2 with a foldable grate 8 is arranged; each wind box has a vacuum control flap 4 for temperature and atmosphere control.
The wind box base 9, which is also foldable, is arranged below the foldable grate 8. The vacuum control flap 4 is therefore located in the area between the grate 8 and the foldable wind box base 9. Both foldable parts 8 and 9 can be equipped so that they can be pivoted together using separate adjustment devices or a common adjustment device 14 by means of a rod 10. The respective pivot angles are marked with reference numeral 11.

The platform 35 has a filling funnel 15',
over the grate surface, which falls onto a closed slide 18, which
Opening is moved in the direction of arrow 19, so that the accumulated rust coating over the window
22 is released for free fall. Preferably, the slide 18 is connected to a vibrating device 17, which causes the grate coating to be evenly distributed and accumulated over the slide.

Below the slide, cone bodies 20 are arranged at a distance from one another, with their cone tips pointing upwards. After opening the slide,

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the bulk material, the grate coating, into the pan 2 or onto the grate 8, whereupon, due to the cone bodies 20, a cone-shaped heap of the type shown is formed with a uniform distribution over the grate surface 8.

Fig. 9 to 12 show the metering device provided below and/or above for the sinter mixture to be added. The metering device shown consists of a filling funnel 25, which is limited at the bottom by a slide 27, which, like the slide 31, has the design shown in Fig. 6. This slide 27 is actuated by means of an adjusting device 26 and accumulates the sintered material as shown in Fig. 9. The slide 31 arranged at a distance below it is actuated in a corresponding manner via an adjusting device 29. When the slide 31 is closed and the slide 27 is open, the sintered material falls down (see Fig. 10), whereby the metering filling sleeve A or B (see Fig. 11 and 14) can be varied by changing the height of the slide via an adjusting device 28. After closing the slide 27 and opening the slide 31, the bulk material falls onto a loosening screen 32, which falls with the falling sintered material onto the grate coating 36 in the pan 2. The screen 32 consists of a ring body as a holder, as shown in Fig. 13

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for wires 34 and vertically arranged pull rods, over which the sieve 32 can be pulled up again in the direction of arrow 38 by means of a suitably equipped lifting device. While the sieve 32 is being pulled up, the sintered material is further loosened and evenly distributed in the pan 2.

As already mentioned, the bulk material quantity is determined by the volume A or B, which can be adjusted by changing the height of the lower slide.

The functionality of the ladle circuit system with the chassis 35 is shown in detail in Fig. 15. From left to right, wind boxes 2 are shown arranged next to each other, of which the left wind box at A is completely filled and already completely sintered. By opening the folding grate 8 (see right figure), the completely sintered material is released for discharge into the discharge funnel 12 (F). The platform 35 is positioned over three wind boxes 2 (B, C, D), whereby a snapshot shows that the filling of one wind box with grate coating 36 is complete. The sieve 32 must be pulled up; only then is the filling process completed. The sieve 32 is pulled up before the platform 35 moves further in the direction of arrow 39 (C). At the same time

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At the same time as two wind boxes 2 are filled, the burner of the ignition hood 37 is activated above an already filled wind box. The chassis 35 is then moved one position further, i.e. in the arrangement shown in Fig. 2 with 30 pans, by a rotation angle of 12°.

The plant described above can be used in particular for sintering iron essence, but also for harbor silt, metal chips or contaminated sand.

Any sinterable material can be used as sintering material and sintering mixture, including all types of sludge that can be sintered on the pans. The grate coating serves to protect the grate bars; it is sieved out of the finished sinter or added from other suitable materials. It is advantageous that all sinterable materials can be transported and processed on the pans. Sintering mixtures are preferably used, the homogeneity of which cannot be guaranteed in large quantities.

A filling device 200 is used to adjust the sinter mixture, as shown in Fig. 16. This filling device 200 consists of a preferably vertically arranged under the wind box 1 or the pan.

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cylindrical feed pipe 201 with an upper feed trough 202. The sinter mixture is fed via a weighing belt 205 in the direction of arrow y. In the interior of the feed pipe 201, two knife-like distributors 210, 210' arranged at a distance from one another are held on a drive shaft 206. The drive shaft 206 runs in the longitudinal direction of the feed pipe and is arranged centrally in the feed pipe 201. The drive shaft 206 is driven via a belt drive or gear drive by means of a drive motor 207. The upper distributor 210 in each case is designed as shown in Fig. 17; it has a number of blades or propellers 210a. These are attached at one end to the drive shaft 206 and with their free ends to an annular body 210b.

The lower distributor 210' is arranged at the top free end of the drive shaft 206 (Fig. 18). This distributor 210' consists of two triangular plate bodies 210'a, 210'b arranged opposite one another from the drive shaft 206 with their tips, with part-circular outer base lines and with a stripping section 216 folded up on a radially running side of the triangle and a strip-shaped smoothing scraper 217 arranged underneath (Fig. 18). The bulk material feeding device 200 works directly with a pan.

A bulk material feeding device is shown as an alternative in Fig. 9 to 12.

The rust deposit can also be fed to the wind boxes 1 or pan via a weighing belt. The window plate (Fig. 5 and 6) is used to catch the rust deposit and distribute it evenly over the pipe cones with their upwardly extending tips. The rust deposit is sieved out of the finished sinter (e.g. grain size 10-20 mm). The rust deposit is used as thermal protection for the grates.

A wide variety of materials can be sintered, such as processing sludge of any kind, iron silicates, iron silicate slag, mill scale, erosion sludge, iron dust, iron oxide sludge from reductions, sludge from steel rolling mills and foundries, used foundry sand, steel sand residues, etc.

Claims (14)

Expectations: 1. Pan circular system with circular segment-like wind boxes (1) with pan-like grates (8) arranged in a ring around a vertical central axis (3), a feeding device with a bulk material feed device for a grate coating and a bulk material feed device for a sinter mixture and a discharge (12) for the finished sintered product, characterized, that a horizontal moving platform (35) which can be rotated about the central axis (3) has at least two bulk material feed devices (15, 25) for the grate coating and the sinter mixture and an ignition hood (37), whereby the bulk material feed devices (15, 25, 43) and the ignition hood (37) can be positioned one after the other over each individual grate (8) by rotating the moving platform (35) and the sintered materials can be transferred from the grate (8) into a removal device (12). 2. Ladle circuit system according to claim 1, characterized in that that the platform (35) has two bulk material feeders connected to respective bunkers (41, 42) devices (15, 25) which are designed as endless conveyor belts (43) or weighing belts for quantity dosing. 3. Ladle circuit system according to claim 1 or 2, characterized in that that each bulk material feeding device (15, 25) on the platform (35) has a dosing device for the bulk material at the end. 4. Ladle circuit system according to one of claims 1 to 3, characterized, that a first dosing device for adding grate coating (36) is provided, which consists of a shaft (15) with a horizontally displaceable slider (18) arranged on the floor. 5. Ladle circuit system according to one of claims 1 to 4, characterized, that in the shaft (15) of the grate coating dosing device, preferably below the slide (18), several conical bodies (20) with upwardly directed tips are arranged. 6. Ladle circuit system according to one of claims 1 to 5, characterized in that the slide (18) is connected to a vibrating or oscillating device (17) and/or consists of a plate with a window-like opening (22) in one half of the plate. 7. Ladle circuit system according to one of claims 1 to 6, characterized in that a second dosing device is provided for feeding the sintering mixture. 8. Ladle circuit system according to one of claims 1 to 7, characterized in that the base (31) of the dosing device, which is preferably designed as the lower of two slides arranged one above the other, is adjustable in height (28). 9. Ladle circuit system according to one of claims 1 to 8, characterized in that each wind box (2) is equipped with a vacuum control flap (4). 10. Ladle circuit system according to one of claims 1 to 9,
characterized, that each wind box (2) has a pan-like grate (8) and a preferably closed base (9), both of which are designed to be pivotable about a horizontal axis, so that after pivoting the grate (8) and the base (9) the sintered finished product falls downwards into a discharge funnel (12), preferably a discharge funnel (12) common to all wind boxes. 11. Ladle circuit system according to one of claims 1 to 10, characterized, that the platform (35) for producing the sinter mixture has a filling device (200) which consists of a cylindrical feed pipe (201) standing vertically on the wind box (1) or pan (2) with an upper feed trough (202) which is preceded by a bulk material feed device such as an endless conveyor belt or weighing belt (43), wherein in the interior of the feed pipe (201) at least two knife-like distributors (210, 210') held at a distance from one another on a central drive shaft (206) are arranged. 12. Ladle circuit system according to claim 11, characterized in that that the upper distributor (210) consists of a number of propellers or blades (210a) attached to the end of the drive shaft (206). 13. Ladle circuit system according to claim 12, characterized in that that the upper distributor (210) consists of a number of propellers or blades (210a) attached to one end of the drive shaft (206) and connected with their free ends to an annular body (210b). 14. Ladle circuit system according to one of claims 1 to 13, characterized by that the lower distributor (210') is attached to the free end of the drive shaft (206) and consists of at least two triangular plate bodies (210'a, 210 ^/ b) arranged opposite one another on the drive shaft (206) with their pointed ends, with part-circular outer base lines and with a stripping section (216) folded up on each radially extending side of the triangle and a strip-shaped smooth strip (217) arranged underneath.