EP3418661A1 - Input device for bulk material - Google Patents

Abstract

An input device (1) for inputting bulk material (2) of particles with different particle sizes into a container, comprising a rotary bunker (8) rotatable about a central axis of rotation (9) with an inlet (7) passing through the central axis of rotation and having an eccentric arranged outlet (10) for the bulk material (2). The outlet (10) opens into a stationary storage bunker (11) from the stationary discharge tubes (12a, 12b, 12c) go out. A device for cooling (5) bulk material comprises a shaft cooler (4) with a cooling shaft (3), and an input device according to the invention, wherein the input device (1) is arranged at the upper end of the cooling shaft (3) of the shaft cooler (4), the drain tubes (12a, 12b, 12c) open with their lower ends in the cooling shaft (3), and the rotary bunker (8) and the supply bunker (11) outside the cooling shaft (3) are arranged. A method for, preferably continuous, input of bulk material (2) in a container, wherein the bulk material (2) is first centrally entered into a about a central axis of rotation (9) rotating bunker (8), then from the bunker (8) eccentrically poured into a stationary storage bunker (11), and then from the stationary storage bunker (11) through stationary drain pipes (12a, 12b, 12c) passes into the container, preferably the cooling shaft (3) of a shaft cooler (4) pours.

Description

Field of engineering

The application relates to an input device for inputting bulk material from particles having different particle sizes into a container, and to a method for inputting bulk material into a container, and to a device for cooling bulk material, comprising such an input device and a shaft cooler with cooling shaft.

State of the art

Hot bulk material, such as sintered iron ore from a sintering plant, generally needs to be cooled before it can be stored in a silo and / or further processed.

It is known for cooling of hot bulk cooling devices with a cooling shaft, which is traversed by a cooling gas in countercurrent to the bulk material, use - so-called shaft cooler. In such shaft coolers heat exchange between the hot bulk material and the cooling gas is operated in the cooling shaft. The hot bulk material is usually entered at an upper end in the cooling shaft and traverses it by gravity down; at the lower end of the cooling shaft, the bulk material is removed in a cooled state. The cooling gas is usually introduced at the lower end of the cooling shaft and discharged above in the heated state as so-called exhaust gas. When the cooling gas is air, it is called cooling air and exhaust air. When cooling the bulk material, efforts are made to avoid uneven or spatially inhomogeneous cooling of the bulk material. Does the bulk material after moving through the cooling duct areas, which only have been slightly cooled and thus have a high temperature, for example, such hot material damage a downstream of the cooling device conveyor and / or a silo in which the bulk material is stored, damage. In addition, in such a case further transport and / or further processing of the bulk material may be delayed, since it is first necessary to wait until said regions of the bulk material have cooled sufficiently.

In order to achieve the best possible and efficient cooling in the cooling shaft, the bulk material in the cooling shaft should be distributed as homogeneously as possible in terms of particle sizes - ie, as far as possible without segregation in the case of a bulk material with different particle sizes. Inhomogeneous distribution of particle sizes in the cooling shaft lead to different high flow resistance of the cooling gas and thus to areas that flow through less and thus less cooled than others. Furthermore, large particles cool down more slowly than small particles because their surface-to-volume ratio is less favorable. If the bulk material contained in the cooling shaft has areas in which a concentration of large particles is above average, the bulk material cools down more slowly in these areas than in areas with average or below-average concentration of large particles. So that the bulk material can cool evenly in the cooling shaft, it is thus advantageous if the bulk material grains are spatially homogeneously distributed in terms of their size in the cooling shaft.

In shaft coolers such as in CN204630395U . CN204630396U . CN103234361B or CN204495075 shown is the input of hot sinter as bulk batch-wise or centrally. This segregates the hot sinter, which usually has a very large grain size with particle sizes up to 200 mm, and the cooling becomes inefficient.

By continuous input by means of moving input devices, attempts are made to achieve as homogeneous a distribution of the particle sizes in the shaft as possible when entering the cooling shaft, even if already segregated bulk material is delivered for input. The problem is that moving system parts of the high temperature of the bulk material and the heated cooling gas are exposed. This can result in significant wear and maintenance.

Summary of the invention Technical task

It is the object of the present invention to provide an input device, a device for cooling bulk material, and a method for entering bulk material in a container, with which a uniform cooling of bulk material consisting of particles of different particle sizes achieved with continuous input under reduced wear and can be improved.

Technical solution

• einen Drehbunker, der um eine zentrale Drehachse drehbar ist, mit einem Einlass für das Schüttgut, durch den die zentrale Drehachse verläuft, und mit einem Auslauf für das Schüttgut, wobei der Auslauf exzentrisch angeordnet ist;
• einen Vorlagebunker, in den der Auslauf des Drehbunkers mündet;
• zumindest drei Ablaufröhren, die von dem Vorlagebunker ausgehen;

wobei der Vorlagebunker und die Ablaufröhren stationär sind.This object is achieved by an input device for inputting bulk material from particles having different particle sizes into a container, characterized in that
this input device comprises:

• a rotary bunker which is rotatable about a central axis of rotation, with an inlet for the bulk material through which passes the central axis of rotation, and with an outlet for the bulk material, wherein the outlet is arranged eccentrically;
• a supply bunker into which opens the outlet of the rotary bunker;
• at least three drainpipes emanating from the original bunker;

wherein the supply bunker and the drainpipes are stationary.

The container is preferably a cooling shaft of a shaft cooler. The shaft cooler has at least one cooling shaft. The shaft cooler or its cooling shaft usually has a vertical longitudinal axis.

The bulk material is preferably hot, that is, has a temperature of at least 300 ° C, preferably at least 400 ° C, preferably it is hot sinter.
As already stated in the introduction, the temperature of the bulk material is lowered in the shaft cooler by heat exchange in countercurrent with a cooling gas, the bulk material is so hot when entering the pit cooler. For example, sintering may have a temperature in the range of 400-700 ° C when inputting.

The bulk material consists of particles of different particle sizes; it can, for example, in sintering, a very large grain size act with particle sizes up to 200 mm.

Under a bunker is to be understood a large container for receiving bulk goods, in the case of the present application for receiving bulk material.

The bunker is rotatable about a central axis of rotation, which is usually perpendicular to the installation of the input device to a container, such as a cooling shaft of a shaft cooler. In operation of the input device of the bunker is about this axis of rotation turned. The axis of rotation passes through the inlet of the rotary bunker for the bulk material. For example, the inlet of the rotary bunker for the bulk material is centrally located, so centric, arranged - the central axis of rotation then passes through this central centrally arranged inlet. Through the inlet transported bulk material by means of a transport device to the input device - in the case of sintered bulk material, for example, with a plate belt - entered into the bunker. The fact that the central axis of rotation passes through the inlet - for example in the case of central arrangement of the inlet - does not change the position of the inlet relative to the transport device during operation when the rotary bunker rotates about its central axis of rotation. This facilitates the entry of the transport device in the bunker.

The bunker has an eccentrically arranged spout. The eccentric outlet of the rotary bunker opens into a stationary bunker, which is positioned adjacent to the bunker. To use gravity to move the bulk material, it is preferable to align the input device with the bunker overlying the bunker.
When installing the input device to a container, for example, on the cooling shaft of a shaft cooler, the rotary bunker is positioned above the hopper bunker, so that the bulk of the gravity of the following progresses from the bunker in the hopper bunker. The central axis of rotation of the bunker does not pass through the eccentrically arranged outlet. The eccentric outlet of the rotary bunker, for example, be an eccentrically arranged hole in the bottom of the bunker. During operation, following gravity, the bulk material passes through the spout from the bunker into the storage bunker, which is positioned below the bunker.

The supply bunker is so called because in it the bulk material for subsequent entry into the container, for example a cooling shaft of a shaft cooler, is presented through the drainpipes. The bunker is stationary, unlike the bunker, it is not moved during operation of the input device.

From the bunker so-called drain pipes go out, at least three. When installing the input device to a container, for example a cooling shaft of a shaft cooler, they extend from the hopper bunker down, so are located under the hopper bunker. The drainpipes are tubes through which the bulk material leaves the supply hopper following gravity, it runs out of it. The end of the drainpipes connected to the feed hopper may be called the feed end, the other end of the drainpipes may be called the chute end.

Preferably, the cross section of the drainpipe is larger with increasing distance from the hopper bunker, so they expand with increasing distance from the hopper bunker. This reduces the risk of clogging. For example, conical tubes are connected as drainpipes with the narrower end, the leading end, with the template bunker.
Through an opening in the bottom of the storage bunker, the bulk material, following gravity, runs in each case into the drainage pipe provided at the corresponding point on the floor. Preferably, the drainpipes are arranged at the bottom of the storage bunker, that in the case of clogging a drain pipe, the bulk material present over it can at least largely run through another drain pipe.

For example, if the feeder is operated in conjunction with a chiller, the downcomers will extend into the chiller cooler shaft at their lower, possibly wider, end, and material will seep out of, possibly wider, end of the downcomer tubes during operation, such as conical tubes, if desired - into the cooling shaft of the shaft cooler. In operation, the bulk material will, according to gravity, run out of the hopper through the drainpipes into the cooling shaft. The material bed of bulk material thus constructed in the cooling shaft is flowed through by cooling gas - preferably cooling air - in countercurrent.

Advantageous Effects of the Invention

Characterized in that during operation of the input device of the rotary bunker is rotated about the central axis of rotation, while through the, preferably centrally located, inlet bulk material is entered into it, occurring during the transition from the transport device into the bunker segregation phenomena of the bulk material are mitigated. By way of example, particles thrown off a conveyor belt will fly to different extents depending on the size, ie they will segregate - the rotation of the rotary bunker will then be followed by equalization of the particle size distribution in the rotary bunker.

Characterized in that the rotary bunker is rotated during operation of the input device, while the supply bunker is stationary, and its outlet is arranged eccentrically, bulk material of gravity follows the rotational bunker rotationally symmetric in the lying below the bunker hopper bunker. Accordingly, the drainpipes are filled from the hopper bunker with bulk material of approximately the same particle size distribution, when the bulk material from the hopper runs into the drainpipes - which ultimately minimizes inhomogeneous particle size distribution in the container, such as a cooling shaft of a shaft cooler, especially in the circumferential direction. The drainage of the bulk material is favored by possibly increasing cross-sectional area of the drainpipes. In the interior of the container, for example a cooling shaft of a shaft cooler, bulk cones are formed at the lower end of the discharge tubes; in the Compared to the use of a single drain pipe, for example, a central input of bulk material in the container, for example, cooling shaft - the cones are less high in the presence of multiple drainpipes. As a result, the segregation in the radial direction around the respective cones decreases compared to higher cones. At least three drainpipes should be present for a usable effect compared to a single drainpipe. Overall, the inventive features of the input device in combination in operation synergistically lead to the fact that even with delivery of segregated bulk material to the inlet of the input device - for example, segregation effects take place on a sinter-supplying plate conveyor - in the container - for example, a cooling shaft of a shaft cooler associated with the input device - both radially as circumferentially substantially homogeneous, and with respect to the longitudinal axis of the container - for example, cooling shaft of a shaft cooler - rotationally symmetric, particle size distribution of the bulk material is present. Segregation effects are made uniform over the cross section of the material bed formed by the bulk material in the container, for example cooling shaft.
As effects result when used in a device for cooling bulk material improved cooling efficiency, uniform and effective cooling of the bulk material and a good heat yield for subsequent use of the heated cooling gas.

A further subject of the present application is a device for cooling bulk material from particles with different particle sizes,
full
a shaft cooler with cooling shaft,
and
an input device according to the invention for the input of bulk material into a shaft cooler,
wherein the input device is arranged at the upper end of the cooling shaft of the shaft cooler, wherein the drain pipes open with their lower ends in the cooling shaft, and the rotary bunker and the supply bunker are arranged outside of the cooling shaft.

In the cooling shaft, hot bulk material is cooled by cooling gas passed through in countercurrent to the bulk material.
In such a device for cooling bulk material, the rotary bunker and the supply bunker are outside the cooling shaft and are thus not exposed to the heated cooling gas present in the cooling shaft, especially at the upper end. Although heat is supplied to the rotary hopper and the hopper bunker through the hot bulk material, but they are also cooled by ambient air. By the arrangement outside the cooling shaft, the risk of heat-related damage is reduced, which would be particularly large in moving parts - ie, for example, the rotary bunker. The stationary components drain pipes open with their lower end - the shaft end - in the cooling shaft; From them, the bulk material pours into the cooling shaft.

The inventive device for cooling bulk material or the input device according to the invention are preferably operated continuously, that is, bulk material is continuously input.

The cooling shaft is preferably designed at least partially axially symmetrical. It preferably comprises a hollow cylindrical shaft section. Whereby expediently the cylinder axis of the hollow cylindrical shaft section is vertically aligned.

Preferably, the cooling shaft is an air-cooled heat exchanger. Expediently, the device for cooling bulk material comprises at least one fan, in particular a fan, for injecting cooling gas, for example Cooling air, in the cooling shaft. Furthermore, the device for cooling bulk material may have at least one pump for sucking cooling air out of the cooling shaft at its upper end.

Another object of the present invention is a method for, preferably continuous, input of bulk material from particles having different particle sizes in a container, preferably in a cooling shaft of a shaft cooler,
wherein the bulk material is first centrally entered into a rotating bunker rotating about a central axis of rotation,
then eccentrically pours out of the bunker into a stationary bunker,
and then from the stationary supply bunker through stationary drain pipes into the container, preferably the cooling shaft of the shaft cooler, pours.

It is to be understood centrally with respect to the input that the input is made through an opening through which passes the central axis of rotation. The central axis of rotation is preferably vertical.

In such a process management, preferably with the input device according to the invention or the device according to the invention for cooling bulk material, the advantageous effects already discussed in the discussion of the input device and the device for cooling bulk material can be achieved.

Brief description of the drawings

• FIG. 1 schematically shows an example of a longitudinal section of an apparatus for cooling bulk material with an input device according to the invention for the input of bulk material in a container.
• FIG. 2 schematically shows an example of an oblique view of a section through the input device according to the invention FIG. 1 ,

Description of the embodiments Examples

FIG. 1 shows in longitudinal section an inventive input device 1 for the input of bulk material 2 in a cooling shaft 3 of a shaft cooler 4. The input device 1 is part of a device for cooling 5 of bulk material. The input device 1 is arranged at the upper end of the cooling shaft 3. Bulk material 2, in this case hot sinter with different particle sizes, is introduced via a transport device - in this case a plate belt 6, but it could also be any other type of transport device suitable for transporting hot sinter - and fed through a centrally central inlet 7 into the rotary bunker 8 , The bunker is rotatable about a vertical, dashed central axis of rotation 9 - indicated by two curved arrows. The central axis of rotation coincides in the example shown with the longitudinal axis of the cooling shaft 3 and the shaft cooler 4, and passes through the inlet 7. From an eccentrically arranged outlet 10 in the rotary bunker 8, the bulk material 2 pours into the stationary storage bunker 11. In the bunker 8 is a contour of the present in operation material pad of bulk material indicated; descend towards the outlet 10. From the supply bunker 11 go out three stationary drain pipes 12a, 12b, 12c. These are conical tubes whose wider end - the shaft end - opens into the cooling shaft 3. At their narrower end - the leading end - they are connected to the bunker 11.
The shaft cooler 4 comprises, in addition to the cooling shaft 3, a fan 13 for blowing in cooling air, supply lines 14 for cooling air, discharge lines 15 for heated cooling air. The Cooling air - represented by a transparent block arrow - is introduced into the bottom of the cooling shaft 3, flows through the material bed 16 of bulk material in the cooling shaft in countercurrent, and at the upper end of the cooling shaft 3 as heated cooling air - represented by a filled block arrow - dissipated.
Rotary bunker 8 and bunker 11 are arranged outside of the cooling shaft 3.
The material bed 16 builds up in the cooling shaft 3, because the bulk material 2 pours from the stationary supply bunker 11 through the discharge tubes 12a, 12b, 12c in the cooling shaft 3. The contour of the material bed 16 is indicated in the cooling shaft 3. The bulk material 2 passes through the cooling shaft 3 in the material bed 16 of gravity following from top to bottom. At the lower end of the cooling shaft 3, the cooled bulk material is discharged. On the presentation of other parts of the device for cooling 5, for example, discharge devices for discharging the cooled bulk material from the cooling shaft, was for better clarity in FIG. 1 waived.

FIG. 2 shows in section in an oblique view enlarges the combination of bunker 8, hopper bunker 11 and drain pipes 12a, 12b, 12c in an input device 1 according to the invention FIG. 1 , The bunker 8 is rotatable about the vertical central axis of rotation 9, indicated by a curved arrow. Its inlet 7 is centrally located centrally, its outlet 10 is arranged eccentrically. The central axis of rotation 9 passes through the inlet 7. Under the rotary bunker 8, the stationary supply bunker 11 is arranged. From the supply bunker 11, the three stationary discharge tubes 12a, 12b, 12c exit.

Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations may occur to those skilled in the art be derived therefrom without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

input device

2

bulk

3

cooling shaft

4

slot cooler

5

Device for cooling bulk material

6

apron

7

inlet

8th

rotary bunker

9

Central axis of rotation

10

outlet

11

collecting hopper

12a, b, c

drain tube

13

fan

14

supply lines

15

discharge lines

16

material bed

List of quotations

• patent literature
• CN204630395U
• CN204630396U
• CN103234361B
• CN204495075

Claims (11)

Input device (1) for inputting bulk material (2) from particles having different particle sizes into a container, characterized in that
this input device (1) comprises: a bunker (8) which is rotatable about a central axis of rotation (9), with an inlet (7) for the bulk material (2) through which the central axis of rotation (9) runs, and with an outlet (10) for the Bulk material (2), wherein the outlet (10) is arranged eccentrically; - A template bunker (11) into which the outlet (10) of the rotary bunker (8) opens; - at least three drainage pipes (12a, 12b, 12c) emanating from the supply bunker (11); wherein the supply bunker (11 and the discharge tubes (12a, 12b, 12c) are stationary. Input device according to claim 1, characterized in that the container is a cooling shaft (3) of a shaft cooler (4). Input device according to claim 1 or 2, characterized in that the bulk material (2) is hot, with a temperature of at least 300 ° C, preferably at least 400 ° C. Input device according to one of claims 1 to 3, characterized in that the bulk material (2) is hot sinter. Input device according to one of claims 1 to 4, characterized in that the cross-section of the discharge tubes (12a, 12b, 12c) with increasing distance from the hopper bunker (11) is larger. Apparatus for cooling (5) bulk material from particles having different particle sizes,
full
a shaft cooler (4) with cooling shaft (3),
and
an input device (1) for inputting bulk material (2) into a shaft cooler (4) according to one of claims 1 to 5, wherein the input device (1) is arranged at the upper end of the cooling shaft (3) of the shaft cooler (4), wherein the Discharge tubes (12a, 12b, 12c) with their lower ends into the cooling shaft (3) open,
and the bunker (8) and the bunker (11) are arranged outside the cooling shaft (3). Apparatus for cooling (5) bulk material according to claim 6, characterized in that the bulk material (2) is hot, with a temperature of at least 300 ° C, preferably at least 400 ° C. Apparatus for cooling (5) bulk material according to claim 6 or 7, characterized in that the bulk material (2) is hot sinter. Method for, preferably continuous, input of bulk material (2) from particles having different particle sizes into a container, preferably into a cooling shaft (3) of a shaft cooler (4),
wherein the bulk material (2) is first input centrally into a rotary bunker (8) rotating about a central axis of rotation (9),
then pours eccentrically from the bunker (8) into a stationary bunker (11),
and then from the stationary supply bunker (11) through stationary drain pipes (12a, 12b, 12c) passes into the container, preferably the cooling shaft (3) of the shaft cooler (4) pours. A method according to claim 9, characterized in that the bulk material (2) is hot, with a temperature of at least 300 ° C, preferably at least 400 ° C. A method according to claim 9 or 10, characterized in that the bulk material (2) is hot sinter.

Images