KR930005017B1 - System for conveying bulk materials - Google Patents

Abstract

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Description

Bulk Material Transport System

[Bulk Material Transport System]

The present invention relates to an apparatus for conveying bulk material from a first container to a second container disposed below, wherein the containers are interconnected by a conveying channel, a first slider and a second slider. . The second slider is arranged along the first slider in the conveying direction so that the first slider and the second slider can each move transverse to the conveying channel from the open position to the closed position or vice versa.

It is known to use bucket wheels to carry bulk material in doses. However, they are complex structures and wear relatively quickly. Moreover, bucket wheels are less stable, especially when operating at high temperatures. Thus, the pieces of coarse bulk material are blocked or blocked by the inlet of the feed channel of the bucket wheel area due to the weight of the bulk material stacked thereon in the longitudinal direction. In addition, when operating at high temperatures, caking formed on the inner wall of the bucket wheel housing prevents the bucket wheel from moving due to friction.

Pressure outlets also have a complex structure and are frequently blocked by formed caking or piles of longitudinally stacked bulk material.

German Federal Republic Patent No. 30 34 539 discloses a worm conveyor, which is arranged in a melting furnace and conveys bulk material to a melt-down gasifier arranged continuously from the reduction furnace. It serves as the dosing device used. This known dosing device is also of a very complex structure and is prone to shutdown due to wear and formed caking. In addition, the drive motor is overloaded easily. Cantilever mounting of screw conveyors is an additional failure factor.

Shutdowns and breakdowns in known dosing devices, ie in the installation according to Federal Republic of Germany Patent No. 30 34 539, lead to the interruption of the whole process. Moreover, such a dosing device is not sufficiently sealed against adjacent spaces, so that the necessary pressure difference between these spaces cannot be maintained.

Federal Republic of Germany Patent No. 33 11 655 discloses a device of the kind defined above, which is designed as a slider-bulk material lock for a non-uniform solid. This known lock has at least two sliders arranged in series in the conveying channel in the conveying direction, which sliders alternately close or open the conveying channel. In order to prevent the coarse pieces of solid being transported from sticking to the side wall of the drop shaft by the slider, the first slider facing the flow of bulk material provides an opening in the drop shaft when in the closed position. This opening may be provided in the side chamber of the drop shaft, and the blocking plate serves as a blocking element to seal the side chamber against the front rim of the slider. The side chamber is only used to receive the front rim of the slider. In such a case, it is difficult to give sufficient closeness to the falling shaft closed by the first slider. Moreover, the known device is prone to failure since the blocking plate, which acts as a blocking element until the closing of the first slider, is loaded by the conveying material.

The present invention aims at eliminating these difficulties and disadvantages, and provides a throttling effect of a dosing device of the initially defined type, ie simple in structure, with increased operational stability and with sufficient pressure when adjacent containers are at different pressures. It is an object of the present invention to provide a dosing device which ensures sufficient pressure loss.

According to the invention, this object is achieved by devising a conveying channel in two parts for conveying the bulk material in the dose, wherein the first part of the conveying channel enters the dosing chamber arranged side by side and conveyed. The second part of the channel starts from the dosing chamber and a first slider is provided at the inlet of the first part of the conveying channel through into the dosing chamber and the second slider is through the second part of the conveying channel. It is provided at the inlet of the chamber.

In the case of conveying the bulk material from the first part of the conveying channel to the second part of the conveying channel, the first slider is in the open position and the second slider is in the closed position so that the first slider is in the open position or in the dosing chamber. The amount of bulk material defined by the size is carried into the dosing chamber and accumulated in the center of the dosing chamber. In case the first slider moves from the open position to the closed position and thus the dosing chamber is closed with respect to the first part of the conveying channel, the inlet of the dosing chamber through the second part of the conveying channel is the second slider. Is opened by moving to the open position, whereby the bulk material accumulated in the center of the dosing chamber is carried further down. Therefore, at least one of the two sliders is kept in the closed position during the whole conveying process, whereby the first part and the second part of the conveying channel are always sealed relative to one another, which causes the undesirable gas medium to enter one of the conveying channels. Movement from one part to another is prevented.

Using the slider as a shutoff device ensures a high degree of operational stability. This is because the slider is not complicated in structure and simple to operate.

A preferred embodiment is characterized in that the second portion of the conveying channel is laterally staged relative to the first portion of the conveying channel in the same direction as the dosing chamber.

A particularly suitable embodiment is characterized in that the conveying channel portions are arranged almost vertically and at least the first slider is inclined with respect to the axis of the conveying channel portions. Accordingly, the bulk material is carried by gravity, and the load applied to the first slider by the weight of the bulk material is reduced.

A particularly suitable embodiment at high operating temperatures is characterized in that the sliders are arranged parallel to one another and the first slider is guided on the second slider, while the second slider is guided on the stationary guide. Therefore, no expansion problem occurs even when the dosing device is heated, and only slight stress or bending moment occurs in the sliders.

An embodiment with particularly good sealing characteristics is characterized in that the first slider has a recess at the free end of the upper surface facing the first part of the conveying channel. In the case where the first slider is closed while sealing the dosing chamber for the first portion of the conveying channel, a conical pile is formed in the recess. In addition, the recess is a friction generated between the first slider or the bulk material accumulated thereon and the corresponding sealing edge or sealing surface of the dosing chamber wall in the inlet region of the dosing chamber when the first slider is closed. Significantly reduces.

Yet another preferred embodiment is characterized in that the first slider carries the bulk material and has a shear surface that is substantially perpendicular to the slider motion, so that the bulk of the bulk material can be filled in the dosing chamber.

Preferably, the first slider has a sealing surface that is in close contact with the wall of the dosing chamber inlet in a closed position which makes the dosing chamber particularly tight.

Each slider is provided with a separate actuation means, which acts independently of the actuation of the other slider.

The dosing device according to the invention is particularly suitable for plants with a furnace which acts for the direct reduction of iron ore and a melt-down gasifier disposed thereunder, the furnace being a plurality of dosing devices arranged around the furnace. Flow is connected with the melt vaporizer through. Due to the throttling effect of the dosing device, the structure height of the furnace can be reduced compared to the furnace provided in known installations.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a portion of a metal container with a dosing device illustrated in cross section.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a detailed cross-sectional view of another embodiment.

4 is a schematic view of a plant provided with a dosing device and equipped with a furnace and a melt vaporizer.

According to FIG. 1, the dosing device 3 is arranged in the lower region 1 of the first metal container 2. The rounded corners 4 and the cylindrical shell 5 of the first container 2 have linings 6 and 7 surrounded by metal outer shells 8 and 9. The outer periphery region of the bottom 4 is provided with several vertical conveying channels 10 as illustrated in cross section in FIG. 1, through which the bulk is stored in the first container 2. Material 11 is conveyed in the direction of arrow 12 to a second metal container below but not shown.

An upper opening is provided in the middle region between the shell 5 and the bottom 4 of the first container 2, which is in contact with the inner surface 13 of the shell lining 7 and the conveying direction 12. When viewed from the forming the first portion 14 of the conveying channel (10). The first portion 14 of this conveying channel 10 enters the dosing chamber 16 disposed thereunder, which stages laterally towards the intermediate axis 15 of the vessel, the dosing chamber being first It is provided in the lining 7 of the one container bottom 4. In the inlet region of the first portion 14 of the conveying channel 10, the lining 7 of the first container 2 forms a sealing edge 17. Below the dosing chamber 16 is a vertical pipe, which forms the second part 18 of the conveying channel 10 and has a desired annular cross-section, which is connected to the bottom of the first container. The second portion 18 has a lining 20 surrounded by a metal shell 19 and is in flow connection with a second container (not illustrated).

The socket 21 projecting upwardly obliquely over the cylindrical shell 5 enters the intermediate range between the cylindrical shell 5 and the bottom 4 of the first container 2. The socket 21 has a lining 23 surrounding the inner space 22 and a cylindrical metal shell 24 surrounding the lining. The end face of the cylindrical metal shell 24 is closed by the metal shear plate 25, and an opening 26 corresponding to the inner space 22 of the socket 21 is provided therein.

The cylindrical pipe piece 28 is flanged to the front end plate 25 to extend the socket 21 in the direction of the oblique longitudinal axis 27 upward, and the lead (29) at the free end 29 of the pipe piece 28. 30 is provided so that the inner space 22 of the socket 21 is sealed outward. The inner space 22 of the socket 21 is laterally bounded by an inner wall 31, 32 having an annular-arc-shaped cross section, the upper and lower regions of the inner space having a planar and parallel inner wall 33 of the lining 23. , 34).

The planar inner wall 33 extending parallel to the longitudinal axis 27 of the socket 21 in the lower region forms a support surface for the base plate 35 fixedly arranged in the inner space 22. The base plate 35 is guided in a U-shaped cross section with guide ledges 37 and 38 fixed to its upper surface 36 and extending parallel to each other along the longitudinal axis of the socket 21. guide rail, which is a guide rail, which extends into the dosing chamber 16 from almost the outer front end 40 of the socket 21 to the second part 18 of the conveying channel 10. The fixed guide free end 41 is in contact with the support surface 42 provided on the lining 7. In the region extending over the second portion 18 of the conveying channel 10, a passage opening 43 through which the bulk material 11 can pass is provided in the base plate 35.

Two superimposed sliders 44 and 45 are mounted on the fixing guide 33 in the inner space 22 of the socket 21, both of which are movable along the longitudinal axis 27 of the socket 21. The slider plate 46 of the upper first slider 44 is disposed at the inlet 48 of the first part 14 of the conveying channel 10 through the dosing chamber 16 and provided below it. The slider plate 47 of the second slider 45 is arranged at the inlet 49 of the dosing chamber through the second part 18 of the conveying channel 10.

The fixed guide 39 serves to guide the slider plate 47 of the second slider 45 at the bottom, and the guide groove 51 corresponding to the guide ledges 37 and 38 is provided at the lower surface 50 of the slider plate. ) Is provided.

The slider plate 47 of the second slider 45 has an upper surface of a loop-shaped cross section with guide surfaces 52 arranged at oblique angles to each other. This causes the slider plate 46 of the first slider 44 to form a prism gude 54 for the lower surface, which has a corresponding sliding surface 53. The upper surface 55 of the slider plate 47 of the second slider 45 extends substantially parallel to the upper inner wall of the socket 21.

The slider plate 46 of the first slider 44 has a recess 57 at the free end 56 facing the conveying channel 10, which is the first part of the conveying channel 10. On the upper surface 58 of the slider plate facing 14). The free end of the slider plate 46 of the first slider 44 carrying the bulk material 11 is provided with a longitudinal axis 27 of the socket 21, i.e. a shear surface 59 substantially perpendicular to the direction of movement of the slider. . The slider 47 of the second slider 45 has a sweeping 62 on the free end 60, ie on the top surface 61 facing the dosing chamber. On the slider plates 46, 47 of the first and second sliders 44, 45, the outer ends 63, 64 distant from the conveying channel 10 are parallel to the longitudinal axis 27 of the socket 21. The extended working rods 65 and 66 are arranged, and the piston rods 67 and 38 of the operating means 69 and 70, which are pressure medium cylinders, extend from the working rods 65 and 66. The piston rods 67, 68 pass through the lid 30 of the pipe piece 28, and the first and second actuating means 69, 70 fixed to the lid 30 of the cylindrical pipe piece 28. Are guided into the cylinder housings 69 'and 70', respectively.

The first slider 44 is an open position A (indicated by a solid line in the drawing), which is a solid line position for opening the inlet 48 of the first portion 14 of the conveying channel 10 through the dosing chamber 16. From the closed position B (shown in dashed lines in the figure) closing the first part 14 of the conveying channel 10 (the free end 56 of the first slider 44 is the dosing chamber 16). Position), or vice versa, by actuating the first actuation means 69. Similarly, the second actuating means 70 enters the inlet from the closed position B ′ (indicated by the solid line) which closes the inlet 49 of the dosing chamber 16 through the second part of the conveying channel 10. A function of moving the second slider 45 to the open position A '(opened by a dashed-dotted line) to open 49, or vice versa.

The operation of the device according to the present invention will be described in more detail as follows.

The bulk material 11 to be conveyed from the first container 2 to the second container disposed below enters the dosing chamber 16 via the first portion 14 of the conveying channel 10. The dosing chamber 16 is closed with respect to the second part 18 of the conveying channel 10 by the second slider 45. The amount of bulk material 11 conveyed or the degree of filling of the dosing chamber 16 are respectively determined by the opening position A of the first slider 44, ie the first portion 14 of the conveying channel 10. The inlet 48 can be adjusted according to the degree to which the opening 48 is larger or smaller. Thereafter, the first slider 44 moves to the closed position B, which is a position where the free end of the slider plate 46 extends into the dosing chamber by the operation of the first operating means 69.

Since the thickness of the slider plate 46 of the first slider 44 is somewhat smaller than the spacing of the inlet 48, this results in a gap 71 between the slider plate 46 and the sealing edge 17 of the lining 7. ) Is formed. When the conveying channel 10 closes the first portion 14, a conical pile of bulk material is formed in the recess 57 provided at the free end 56 of the slider plate 46, which is formed by a gap ( 71 and the gas is dynamically sealed, and the dosing chamber 16 is in close contact with the first portion 14 of the conveying channel 10. In addition, the recess 57 keeps the frictional force between the bulk material 11 and the sealing edge 17 low, so that the abrasive bulk material is not excessively worn and is required to close the first slider 44. The operating force is kept low. Therefore, it is possible to design the slider plate 46 without such a recess, and the thickness of the slider plate 46 is such that the upper surface of the slider plate 46 slides with the sealing edge 17 in the closed position B. FIG. Is selected for contact. During the closing process, the shear surface 59 provided at the free end 56 of the first slider 44 is added to another bulk material 11 in addition to the bulk material 11 which is automatically introduced into the dosing chamber 16. Is carried into the dosing chamber 16. This allows the dosing chamber 16 to be completely filled to some extent depending on the distance the first slider 44 traverses, ie the upper right region 72 of the dosing chamber 16 in FIG. have.

When the inlet 48 of the first part 14 of the conveying channel 10 leading into the dosing chamber 16 is closed by the first slider, the second slider 45 faces the second actuating means 70 in the opposite direction. Operation is moved to the open position A ', thereby emptying the dosing chamber 16 inlet through the pipe 18 forming the second part of the conveying channel 16. The bulk material 11 falls into a container (not shown) below through a pipe 18 disposed on the bottom surface of the first container 2.

When the dosing chamber 16 is emptied, the inlet 49 of the dosing chamber 16 through the second portion 18 of the conveying channel 10 actuates the second actuating means 70, thereby providing a second slider. It is closed by moving the 45 to the closed position B '. As a result, the inlet 48 of the first portion 14 of the conveying channel 10 through the dosing chamber 16 is emptied again by moving the first slider 44 to the open position A and Another filling of the bulk material 11 is filled in the dosing chamber 16.

At least one of the two sliders 44, 45 is located in the closed position (B or B ') during the whole conveying process, whereby the first part 14 and the second part 18 of the conveying channel 10 It is always sufficiently sealed against each other. Another advantage of the device is that the sliders 44 and 45 self-clean, thus avoiding caking.

Due to the oblique position of the first slider 44, only a small force is required to operate the first slider 44. This is because the bulk material 11 to be conveyed automatically enters the dosing chamber 16 when the inlet 48 is opened due to the large gravity caused by the oblique arrangement of the first slider. Since the two sliders 44 and 45 are guided in parallel to each other and the first slider 44 is guided on the second slider 45, there is no problem of expansion when the dosing chamber 3 is heated. Do not. The dosing device can therefore also be used at high temperatures. In addition, the load or bending moment acting on the sliders 44 and 45 itself is kept low.

According to the embodiment illustrated in FIG. 3, the slider plate 46 ′ of the first slider 44 has a sealing surface 74 parallel to the vertical wall 73 of the first portion 14 of the conveying channel 10. The sealing surface is in close contact with the vertical wall 73 in a closed position B of the first slider 44. This embodiment is particularly good.

A preferred field of application for dosing devices is the use in plants for producing steel. The plant comprises a first container 75 which is a furnace used for direct reduction of iron ore as shown in FIG. 4 and a second container 76 which is a melt-down gasifier disposed thereunder. The first container 75 comprises a plurality of dosing devices 3 provided in its lower region and is connected to the second container 76 via a conveying conduit 77 connected to the dosing device 3. The throttling effect of the dosing device 3 can maintain a significant pressure difference between the first container 75 and the second container 76 while the bulk material is transported to the second container 76. That is, a very small amount of gas formed in the second container 76 can escape to the internal space of the first container 75 through the transport channel of the dosing device 3.

In addition, due to the good adhesion of the dosing device, it is possible to reduce the height of the furnace, compared with the known furnace, and the construction cost of the plant is significantly lowered. The particularly simplified structure of the dosing device according to the invention results in additional cost savings. In addition, the very high operational stability of the dosing device lowers the operating and maintenance costs.

The present invention is not limited by the embodiments illustrated in the drawings, and may be variously modified. Therefore, other actuation means, such as adjustment spindles, can be used to move the slider instead of the pressure mediator cylinder. In addition, only the first slide may be arranged obliquely, and the second slider may be arranged horizontally.

According to another embodiment, both sliders can be arranged horizontally, from which it is possible to guide the first slider to each of the fixing guides fixed to the fixing plate provided on the second slider. In addition, the first portion and the second portion of the conveying channel may be arranged in a line with each other. In particular, for hot bulk materials it would be appropriate to provide a cooling device in the slider plate, in particular in the region of the front end of the slider plate.

Claims (9)

An apparatus 3 for conveying bulk material 11 from a first container 2, 75 to a second container 76 arranged below it, wherein the containers 2, 75, 76 are conveying channels 10. ), Interconnected by the first slider 44 and the second slider 45, the second slider 45 is arranged to follow the first slider 44 in the transport direction 12, each of In a device (3) in which the slider can move transversely with respect to the conveying channel (10) from each open position (A and A ') to each closed position (B and B') or vice versa. The dosing chamber 16 consists of two parts for carrying the bulk material in the doses, and the first part 14 of the carrying channel 10 is arranged side by side. ), The second part 18 of the conveying channel 10 starts from the dosing chamber 16 and the first slider 44 Is provided at the inlet 48 of the first portion 14 of the conveying channel 10 through the dosing chamber 16, the second slider 45 being the second portion of the conveying channel 10. 18) an inlet (49) of the dosing chamber (16) through it. 2. The second part (18) of the conveying channel (10) according to claim 1, wherein the second portion (18) of the conveying channel (10) extends laterally with respect to the first portion (14) of the conveying channel (10) in the same direction as the dosing chamber (16). The device characterized in that it comprises. The conveying channel portions 14, 18 are arranged vertically, at least the first slider 44 being inclined with respect to the axis of the conveying channel portions 14, 18. The device characterized in that. According to claim 1, The sliders (44, 45) are arranged in parallel to each other, the first slider 44 is guided on the second slider 45, the second slider 45 is fixed guide And guided on (39). 5. The recess (57) according to claim 1, wherein the first slider (44) is provided with a recess (57) at the free end (56) on the upper surface (58) facing the first part of the conveying channel. Device. 5. Apparatus according to claim 1 or 4, characterized in that the first slider (44) has a shear surface (59) which carries bulk material and is perpendicular to the direction of slider movement. 5. The sealing surface 74 according to claim 1, wherein the first slider is in close contact with the wall 73 located at the inlet 48 through the dosing chamber 16 in the closed position B. 6. Device characterized by having. A separate actuating means (69, 70) is provided for each of said sliders (44, 45), which can be operated independently of the actuating means (69, 70) of the other sliders (44, 45). The device characterized in that. In a plant comprising a first container (75) for direct reduction of iron ore, and a second container (76) disposed thereunder, wherein the first container (75) is disposed around the first container. A plant characterized in that it is fluidly connected with the second container via a dosing device (3) according to any one of the preceding claims.

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