WO1989004445A1

WO1989004445A1 - System for conveying bulk materials

Info

Publication number: WO1989004445A1
Application number: PCT/AT1988/000091
Authority: WO
Inventors: Wilhelm Stastny; Bernhard Rinner
Original assignee: Voest-Alpine Industrieanlagenbau Gesellschaft M.B.
Priority date: 1987-11-12
Filing date: 1988-11-07
Publication date: 1989-05-18
Also published as: SU1709915A3; AU615693B2; DD285323A5; JPH02502214A; AT389503B; AU2615488A; KR890701969A; JP2768711B2; KR930005017B1; UA2128A1; ATA299187A

Abstract

In a system (3) for conveying bulk materials (11) form the first container (2) into a second container arranged below the latter, the two containers being connected by a conveyor channel (10), a first slide and a second slide arranged downstream in the direction of conveying (12), can each be moved from an inlet position (A or A') to a closed position (B or B') and vice and versa perpendicular to the conveyor channel. To obtain a simple reliable metering device which is adequately sealed from adjacent spaces, metered conveying of the bulk materials is effected by dividing the conveyor channel (10) into two parts. The first part (14) of the conveyor channel (10) opens into a lateraly offset metering chamber (16), which opens the second part (18) of the conveyor channel (10). First slide is arranged at the junction of the first part (14) of the conveyor channel (10) within the metering chamber (16) and the second slide is arranged at the junction of the metering chamber (16) within the second part (18) of the conveyor channel (10).

Description

Device for conveying bulk goods

The invention relates to a device for conveying bulk material from a first container into a second container arranged underneath, which containers are connected by means of a conveying channel, a first slider and a second slider downstream in the conveying direction being respectively transversely from an inlet position to a closed position and vice versa are movable to the conveyor channel.

It is known to use cellular wheels for the metered conveying of bulk material. However, these are structurally complex and wear out relatively quickly. Furthermore, the cellular wheels have only a low level of operational reliability, especially at higher operating temperatures. For example, Wedge or fix pieces of a coarse-grained bulk material at the mouth of the feed channel into the cell wheel area by the weight of the column of bulk goods lying above it, so that these block the cell wheel. At higher operating temperatures, caking on the inner wall of the cellular wheel housing also causes the cellular wheel to stick.

Pressure locks are also structurally complex and often block due to caking or the weight of the bulk material column.

DE-A-30 34 539 discloses a screw conveyor which is arranged in a reduction shaft furnace and serves as a metering device for bulk material to be conveyed from the reduction shaft furnace into a downstream melter gasifier. This known metering device is also structurally very complex and susceptible to malfunctions due to wear and caking. Furthermore, the drive motor can be relative can be easily overloaded. The flying storage of the screw conveyor is an additional disturbance-generating factor.

The malfunctions or failures occurring in the known metering devices can e.g. in a system according to DE-A - 30 34 539 lead to an interruption of the entire process, which should be avoided at all costs. Furthermore, these metering devices often do not have sufficient tightness with respect to the adjacent rooms, so that a possibly desired pressure difference between these rooms cannot be maintained.

From DE-A - 33 11 655 a device of the type described above is known, which is designed as a slide bulk goods lock for heterogeneous solids. This known lock has at least two slides arranged one after the other in a conveying channel in the conveying direction, which alternately close or release the conveying channel. To avoid jamming coarse chunks of the conveyed solids by means of a slide on the chute side wall, the first leaves the. Bulk flow facing slider in the closed position an opening in the chute free. This opening can be arranged in a side chamber of the chute, a locking plate serving as a blocking member sealing the side chamber against the front edge of the slide. The side chamber only serves to accommodate the front edge of the slide. It is difficult to achieve sufficient tightness of the chute closed by the first slide. Furthermore, the known device is susceptible to faults, since the blocking plate working as a blocking member is loaded by the conveying material when the first slide is closed. The invention aims to avoid these difficulties and disadvantages and has as its object to provide a metering device of the type described in a simple design, which ensures increased operational safety and sufficient pressure loss, ie a sufficient throttling effect at different pressures in the adjacent containers.

This object is achieved in that for the metered conveying of the bulk material, the conveying channel is formed in two parts and the first part of the conveying channel opens into a metering chamber arranged laterally offset from it, from which the second part of the conveying channel extends, the first slide at the mouth of the first part of the delivery channel into the metering chamber and the second slide at the mouth of the metering chamber is provided in the second part of the delivery channel.

When bulk material is conveyed from the first part of the conveying channel into the second part of the conveying channel, the first slide is in the inlet position and the second slide is in the closed position, so that one is determined by the position of the inlet position of the first slide or by the size of the metering chamber Quantity of bulk material is conveyed into the dosing chamber and stored there temporarily. After the first slide has been moved from the inlet position into the closed position and the metering chamber is thus closed off from the first part of the conveying channel, the mouth of the metering chamber into the second part of the conveying channel is released by moving the second slide into the inlet position and the one temporarily stored in the metering chamber Bulk conveyed further. Thus, at least one of the two sliders is located throughout Conveying process in the closed position, whereby the first part and the second part of the conveying channel are always sealed against one another and an undesired escape of a gaseous medium from one part of the conveying channel into the other is prevented.

The use of slides as shut-off devices ensures a high level of operational safety, since they are uncomplicated to set up and easy to operate. Blocking of the slides caused by caking is also prevented, since the slides are self-cleaning.

A preferred embodiment is characterized in that the second part of the delivery channel is laterally offset from the first part of the delivery channel in the same direction as the metering chamber.

A particularly advantageous embodiment is characterized in that the conveyor channel parts are arranged approximately vertically and at least the first slide is inclined to the axis of the conveyor channel parts. As a result, the bulk material is conveyed by gravity and the load on the first slide caused by the weight of the bulk material is reduced.

An embodiment which is particularly suitable for high operating temperatures is characterized in that the slides are arranged parallel to one another and the first slide is guided on the second slide, whereas the second slide is guided on a fixed guide. As a result, there are no expansion problems when the metering device heats up and only slight loads or bending moments on the slides occur.

An embodiment with particularly good ones Sealing properties are characterized in that the first slide has a recess at its free end on its upper side directed towards the first part of the conveying channel. When the first slide is closed, a pouring cone that seals the metering chamber from the first part of the delivery channel forms in the depression. Furthermore, the depression between the first slide or the bulk material lying thereon and a corresponding sealing edge or surface on the wall of the metering chamber in the region of the mouth into the metering chamber is considerably reduced by the depression.

A further preferred embodiment is characterized in that the first slide has an end face which conveys the bulk material and is directed approximately perpendicular to the slide movement, as a result of which a particularly high degree of filling of the metering chamber can be achieved.

The first slide preferably has a sealing surface in the closed position on a wall at the mouth of the metering chamber, as a result of which the metering chamber is particularly tight.

Each slide is expediently provided with its own actuating device which can be activated independently of the actuating device of the other slide.

The metering device according to the invention is particularly well suited for a system with a shaft furnace serving for the direct reduction of iron ore and a melter gasifier arranged underneath, the shaft furnace being connected to the meltdown gasifier by lines by means of several metering devices arranged on the circumference thereof. Through the Throttling effect of the metering device, the shaft furnace can have a reduced overall height compared to the shaft furnaces provided in known systems.

The invention is explained below with reference to the Ausführungsbei games shown in the drawing, wherein Fig. 1 shows a section through part of a metallurgical vessel with a metering device shown in section. Fig. 2 shows a section along the line II-II of Fig. 1 and Fig. 3 shows a detail of another embodiment also in section. Fig. 4 illustrates a schematically shown and provided with metering system with shaft furnace and melter gasifier.

1, a metering device 3 is arranged in the lower region 1 of a first metallurgical container 2. The cambered bottom 4 and the cylindrical casing 5 of the first container 2 are provided with a lining 6, 7, which is surrounded by a metal outer casing 8, 9. In the outer circumferential area of the bottom 4 are a plurality of vertically directed conveying channels 10, one of which is shown in section in FIG. 1, for conveying bulk material 11 stored in the first container 2 in the conveying direction represented by arrows 12 into a second, not shown, underlying metallurgical container provided.

A first part 14 of the conveying channel 10 seen in the conveying direction 12 forms egg ne lying in the transition region between the casing 5 and the bottom 4 of the first container 2 and tangent to the inside 13 of the casing lining 7 upper opening. This first part 14 of the conveying channel 10 opens into a metering chamber 16 which is arranged below and to the side of the first part 14, laterally offset in the direction of the central axis 15 of the vessel, and which in the lining 7 of the Bottom 4 of the first container 2 is provided. In the region of the mouth of the first part 14 of the conveying channel 10, the lining 7 of the first container 2 forms a sealing edge 17. Below the metering chamber 16, a pipe 18 forming the second part of the conveying channel 10, preferably having a circular cross section, is connected the bottom of the first container 2 is attached. The tube 18 has a lining 20 surrounded by a metal jacket 19 and establishes the line connection with the second container, not shown.

In the transition area between the cylindrical jacket 5 and the bottom 4 of the first container 2, a nozzle 21 protruding above the cylindrical jacket 5 and directed obliquely upwards opens into the delivery channel 10. The nozzle 21 has a lining 23 surrounding its interior 22 and a lining 23 comprising cylindrical metal jacket 24. The cylindrical metal jacket 24 is closed at the end by means of a metal end plate 25, in which an opening 26 corresponding to the interior 22 of the connector 21 is provided.

On the end plate 25 is a connecting piece 21 in the direction of its obliquely upward longitudinal axis 27 extending cylindrical tube piece 28, which is provided at its free end 29 with a cover 30, whereby the interior 22 of the connecting piece 21 is sealed from the outside is. The interior 22 of the socket 21 is laterally limited in cross section by inner walls 31, 32 in the form of a circular arc and in the upper and lower regions by flat and parallel inner walls 33, 34 of the lining 23.

The parallel to the longitudinal axis 27 of the in the lower area Stub 21 extending flat inner wall 33 forms a support surface for a base plate 35 which is arranged in a fixed manner in the interior 22. The base plate 35 forms together with guide strips 37, 38 which are fastened to their upper side 36 and also extend in the direction of the longitudinal axis 27 of the stub 21 and extend parallel to one another a guide rail 39 with a U-shaped cross section, which extends approximately from the outer end 40 of the nozzle 21 into the metering chamber 16 to the second part 18 of the delivery channel 10, where it has its free end

41 on a support surface arranged in the lining 7

42 is present. In the area which extends over the second part 18 of the conveying channel 10, there is a passage opening 43 in the base plate 35 for the bulk material to be conveyed

11 provided.

In the interior 22 of the nozzle 21, two slides 44, 45 arranged directly one above the other are mounted above the guide rail 39, both of which can be displaced in the direction of the longitudinal axis 27 of the nozzle 21, the slide plate 46 of the upper, first slide 44 at the mouth 48 of the first Part 14 of the delivery channel 10 in the metering chamber 16 and the slide plate 47 of the underlying second slide 45 are located at the mouth 49 of the metering chamber 16 in the second part 18 of the delivery channel 10.

The guide rail 39 serves to guide the slide plate 47 of the lower second slide 45 provided on its underside 50 with guide grooves 51 corresponding to the guide strips 37, 38.

The slide plate 47 of the second slide 45 has a roof-shaped top cross-section with surfaces at an obtuse angle approximately 52, which have the corresponding sliding surfaces 53 The underside of the slide plate 46 of the first slide 44 form a prism guide 54. The upper side 55 of the slide plate 47 of the second slide 45 extends approximately parallel to the upper inner wall 34 of the connecting piece 21.

The slide plate 46 of the first slide 44 has at its free end 56 facing the delivery channel 10 a recess 57 on the upper side 58 facing the first part 14 of the delivery channel. At the free end 56 of the slide plate 46 of the first slide 44 there is further provided an end face 59 which conveys the bulk material 11 and which is approximately at right angles to the longitudinal axis 27 of the connecting piece 21, i.e. to the direction of displacement. The slide plate 47 of the second slide 45 has a bevel 62 at its free end 60 on its upper side 61 facing the metering chamber. On the slide plates 46, 47 of the first and second slide 44, 45 on the outer, i.e. End 63, 64 facing away from the conveying channel 10 is arranged an actuating rod 65, 66 which extends parallel to the longitudinal axis 27 of the connecting piece 21 and to which a piston rod 67, 68 of a pressure medium cylinder 69, 70, which extends the actuating rod 65, 66, is connected. The piston rods 67, 68 pass through the cover 30 of the pipe section 28 and are each guided in a cylinder housing 69 ', 70' of the first and second pressure medium cylinders 69, 70 fastened to the cover 30 of the cylindrical pipe section 28.

The first slide 44 is by acting on the first pressure medium cylinder 69 from an opening 48 of the first part 14 of the delivery channel 10 in the metering chamber 16 and in the drawing, shown in solid lines, in an inlet position A blocking the first part 14 of the delivery channel 10 and with dash-dotted lines Lines shown closing position B (in which the first slide 44 with its free end 56 in the dosing chamber 16 protrudes) and vice versa. In an analogous manner, the second pressure medium cylinder 70 serves to move the second slide 45 out of a closed position B 'which blocks the mouth 49 of the metering chamber 16 into the second part 18 of the conveying channel 10 and is shown in solid lines in an inlet position which opens the mouth 49 and is shown in broken lines A 'and in the opposite direction.

The mode of operation of the device is explained in more detail below: The bulk material 11 to be conveyed from the first container 2 into the second, underlying container passes via the first part 14 of the conveying channel 10 into the sealed with respect to the second part 18 of the conveying channel 10 by means of the second slide 45 Metering chamber 16. The amount of bulk material 11 to be conveyed or the degree of filling of the metering chamber 16 can be metered through the inlet position A of the first slide 44, through which the mouth 48 of the first part 14 of the conveyor channel 10 can be released more or less. Subsequently, by acting on the first pressure medium cylinder 69, the first slide 44 is moved into the closed position B, in which the free end 56 of the slide plate 46 projects into the metering chamber 16.

The thickness of the slide plate 46 of the first slide 44 is somewhat less than the clear width of the mouth 48, as a result of which a gap 71 is formed in the lining 7 between the slide plate 46 and the sealing edge 17. When the first part 14 of the conveying channel 10 is closed, a bulk material cone is formed in the recess 57 at the free end 56 of the slide plate 46, which together with the gap 71 forms a dynamic gas seal and sufficient dosing chamber 16 is sealed against the first part 14 of the Delivery channel 10 guaranteed. Furthermore, the friction 57 between the Bulk material 11 and the sealing edge 17 are kept low, so that even abrasive bulk material does not cause excessive wear and the actuating force required for closing the first slide 44 is kept low. However, it is also possible to design the slide plate 46 without such a recess, the thickness of the slide plate 46 being selected such that the upper side of the slide plate 46 lies sealingly against the sealing edge 17 in the closed position B. The end face 59 provided on the free end 56 of the first slide 44 conveys further bulk material 11 into the metering chamber 16 during the closing process in addition to the bulk material 11 that has automatically flowed into the metering chamber 16, as a result of which the metering chamber 16 is more or less completely dependent on that of the first slide 44 distance traveled - can be filled, i.e. also the upper right area 72 of the metering chamber 16 as seen in FIG. 1.

After the opening 48 of the first part 14 of the delivery channel 10 has been closed into the metering chamber 16 by means of the first slide 44, the second slide 45 is moved into the inlet position A 'by acting on the second pressure medium cylinder 70 in the opposite direction, and the mouth of the metering chamber 16 into the second Part of the delivery channel 10 forming tube 18 released. The bulk material 11 falls through the tube 18 arranged on the underside of the first container 2 into the lower container, not shown.

After the metering chamber 16 has been emptied, the mouth 49 of the metering chamber 16 into the second part 18 of the delivery channel 10 is closed by actuating the second pressure medium cylinder 70 and moving the second slide 45 into the closed position B '. The junction 48 of the first part 14 of the delivery channel 10 into the metering chamber 16 is then through Moving the first slide 44 into the inlet position A is released again and a further batch of bulk material 11 to be conveyed enters the metering chamber 16.

During the entire conveying process, at least one of the two slides 44 and 45 is in the closed position B and B ', as a result of which the first part 14 and the second part 18 of the conveying channel 10 are always sufficiently sealed from one another and prevent an undesired escape of a gaseous medium becomes. Another advantage of the device is the fact that the slides 44, 45 are self-cleaning, which prevents caking.

Due to the very inclined position of the first slide 44, only a small amount of force is required to actuate the first slide 44, since the bulk material 11 to be conveyed largely enters the metering chamber 16 by gravity when the mouth 48 is opened. Since the two sliders 44, 45 are guided parallel to each other and the first slider 44 is guided on the second slider 45, no Dehnungsp rob learn when the metering device 3 is heated, so that the metering device can also be used at high temperatures. Furthermore, loads or bending moments on the slides 44, 45 themselves are thereby kept low

According to the embodiment shown in FIG. 3, the slide plate 46 'of the first slide 44 has a sealing surface 74 which is directed parallel to the vertical wall 73 of the first part 14 of the conveying channel 10 and which, in the closed position B of the first slide 44, lies sealingly against this wall 73. In this embodiment, a particularly high level of tightness is ensured. A preferred area of application for the. 4 with a shaft furnace 75 serving for the direct reduction of iron ore and a melter gasifier 76 arranged underneath. The shaft furnace 75 has several dosing devices 3 arranged in its lower area and is connected to the dosing devices 3 connected delivery lines 77 connected to the melter gasifier 76. The throttling action of the metering devices 3 makes it possible to maintain the pressure difference between the shaft furnace 75 and the melter gasifier 76 even when bulk material is being conveyed into the melter gasifier 76, that is to say that only very small quantities of gas produced in the melter gasifier 76 can be conveyed via the feed channels

Dosing devices 3 escape into the interior of the shaft furnace 75.

The good tightness of the metering device thus also leads to a reduction in the shaft height compared to known shaft furnaces, as a result of which the construction costs of the system can be considerably reduced. The particularly simple construction of the metering device according to the invention also saves costs. The extremely high operational reliability of the dosing device also ensures low operating and maintenance costs.

The invention is limited. not to the exemplary embodiments shown in the drawing, but can be modified in various ways. Instead of the pressure cylinder, other actuating devices, such as adjusting spindles for moving the slide, can also be provided. Furthermore, it is also possible to only incline the first slide and to arrange the second slide horizontally. According to a further embodiment, the two slides can be arranged horizontally, the first slider being able to be guided on its own guide rail, which is fastened to a stationary plate provided above the second slider. The first part and the second part of the conveyor channel can also be arranged in alignment with one another. For particularly hot bulk goods, it may be appropriate to provide the slide plates with water cooling, especially at their front end areas.

Claims

Claims:

1. Device (3) for conveying bulk material (11) from a first container (2, 75) into a second container (76) arranged underneath, which containers (2, 75, 76) are connected by means of a conveying channel (10). d, wherein a first slide (44) and a second slide (45) arranged downstream in the conveying direction (12) can each be moved transversely to the conveying channel from an inlet position (A or A ') to a closed position (B or B') and vice versa , characterized in that for the metered conveying of the bulk material the conveying channel (10) is formed in two parts and the first part (14) of the conveying channel (10) opens into a metering chamber (16) laterally offset from it, of which the second part (18th ) of the delivery channel (10), the first slide (44) at the opening (48) of the first part (14) of the delivery channel (10) into the metering chamber (16) and the second slide (45) at the mouth (49 ) of the dosing chamber (16) in the second part (18) of the delivery channel ( 10) is provided.

2. Dosing device according to claim 1, characterized in that the second part (18) of the delivery channel (10) to the first part (14) of the delivery channel (10) is laterally offset in the same direction as the metering chamber (16).

3. Dosing device according to claim 1 or 2, characterized in that the conveyor channel parts (14, 18) is arranged approximately vertically and at least the first slide (44) inclined to the axis of the conveyor channel parts (14, 18).

4. Dosing device according to one or more of claims 1 to 3, characterized in that the Slides (44, 45) are arranged parallel to one another and the first slide (44) is guided on the second slide (45), whereas the second slide (45) is guided on a stationary guide (39).

5. Dosing device according to one or more of claims 1 to 4, characterized in that the first slide (44) at its free end (56) on its upper part (58) directed to the first part of the conveying channel has a depression (57).

6. Dosing device according to one or more of claims 1 to 5, characterized in that the first slide (44) has an end face (59) which promotes the bulk material (11) and is approximately perpendicular to the slide movement.

7. Metering device according to one or more of claims 1 to 6, characterized in that the first slide (44) in the closed position (B) on a wall (73) at the mouth (48) to the metering chamber (16) adjacent sealing surface (74 ) has (Fig. 3).

8. Dosing device according to one or more of claims 1 to 7, characterized in that each slide (44, 45) is provided with its own actuating device (69, 70) which is independent of the actuating device (69, 70) of the other slide ( 44, 45) can be activated.

9. Plant with a direct reduction of iron ore shaft furnace (75) and a melter gasifier arranged below (76), characterized in that the shaft furnace (75) over a plurality of the same arranged metering devices (3) according to one or more of claims 1 to 8 is connected in line with the melter gasifier (76).