TW201527014A - Sinterstrand-charging device - Google Patents

Abstract

The present invention concerns a sinterstrand-charging device for charging a sinter mixture on a belt-type sintering machine comprising an extraction device for feeding the material to be sintered onto a sintering belt, wherein a feeding container is provided with a discharge opening for the material to be sintered. Said extraction device machine comprises: a plurality of extraction rollers, which cover between 5% and 50% of the discharge opening, a plurality of segregation rollers for segregating and deposing said extracted material to be sintered onto the sintering belt, wherein said extraction rollers are situated in a first plane and said segregation rollers are situated in a second plane.

Description

Sintering machine feeding device

The present invention generally relates to a sintering machine feed apparatus for feeding a sintered mixture (i.e., a fine ore mixture and a fuel) onto a belt sintering machine to form a sintered bed.

The production of fines ore agglomerates for use in blast furnaces is known as sintering or cohesion. Sintering thus causes the fine iron ore to be cohesive for use in blast furnace charge preparation. In conventional sinter plants, the sintered mixture (i.e., the fine ore mixture and fuel) is placed on a sintered belt (i.e., a conveyor belt designed as a grid). A sintered belt (also known as a sintered bed) with a mixture passes over a large number of suction boxes. The air is drawn through the sintering bed through the suction box. An ignition hood positioned above the first suction box ignites the sintered mixture. During the passage over the other suction boxes, the combustion spreads from the top down through the sintering bed. During combustion, the blended fuel produces a temperature just sufficient to soften the fines at the surface so that the fine ore mixture is cohesed to form agglomerates. The combustion gas generated during the sintering is discharged together with the combustion air through the suction box. The sinter plant is usually equipped with a suction box connected to the fan via an electrostatic filter (and in some cases also a fabric filter) which produces the required negative pressure under the sinter belt to pump the required combustion air. Pass through the sintering bed. The cleaned gas mixture is then vented to the atmosphere via a chimney by a fan.

For economic reasons, the steel industry is striving to increase the productivity of the sinter plant. For this purpose, as one of several possibilities, it is preferred to increase the feed to the layer on the sintered belt. thickness. The above thickness increase can be achieved without reducing productivity only if the permeability of the mixture is improved and/or the negative pressure in the getter system is increased.

The current state of the art is to equip existing feed devices with sorting devices that separate most of the coarse particles from the original sintered mixture and concentrate the coarse particles in the lower region of the feed layer.

It is further known that, in the case of a feeding device, the drum chute (separation plate) is designed in such a way that a mixing of the materials is achieved by the feeding operation. However, this design does not allow for a large layer thickness to be achieved while good separation.

JP 2001-227872 discloses double layer feeding of a sintered material via a feed bin having two discharge ports. The sintered material is fed into the feed bin in such a manner that separation takes place in the feed bin. Each of the discharge ports is provided with a complete system comprising a feed device, a feed roller and a drum chute. Disadvantages of this variant are high maintenance costs, as well as complex and prone to faulty control systems for the two feed rolls.

US 2008/0108006 A1 describes a dosing device for a belt sintering machine having a feed container for receiving material to be sintered, having a conveying device for filling the feed container with the material to be sintered, useful Feeding the material to be sintered to a feed drum and a drum chute on the sintering belt, wherein the feed container is provided with two discharge ports for the material to be sintered, and the first discharge port is connected to the feed roller and The two discharge ports are connected to the feed chute to feed the material to be sintered onto the sintering belt, and the conveying device is arranged in such a way as to have a point of impact on the material to be sintered, the impact point being located at the feeding container In the half above the first discharge opening, and the second discharge opening is arranged in a sloped region formed by the material to be sintered.

However, such systems are quite complex and therefore costly to construct and maintain.

Accordingly, it is an object of the present invention to provide a sintering machine feed apparatus that achieves good separation and has an easy to maintain extraction apparatus.

This object is achieved by a sintering machine feed device as claimed in claim 1 of the scope of the patent application.

General description of the invention

The present invention is generally directed to a sintering machine feed apparatus for feeding a sintering mixture onto a belt sintering machine to form a sintering bed, as set forth in the section prior to the definition of the features of claim 1 of the patent application.

In order to overcome the above mentioned problems, the present invention proposes a sintering machine feeding device for feeding a sintering mixture onto a belt sintering machine to form a sintering bed, the feeding device comprising a material for receiving a material to be sintered a feed container, a conveying device for loading a material to be sintered with a material to be sintered, an extracting device for feeding a material to be sintered onto a sintering belt, wherein the feeding container is provided with a material for discharging the material to be sintered mouth. The extraction device comprises: a plurality of extraction rollers located below the discharge opening for extracting material to be sintered from the feed container, the extraction rollers rotating about a central axis and each having a diameter covering the discharge 5% to 50% of the holes; a plurality of separation rollers for separating the extracted material to be sintered and depositing the material onto the sintered belt, wherein the extraction roller is in the first plane and the separation roller is in the second In the plane.

The above-mentioned sintering machine feed for feeding the sintering mixture to the belt sintering machine The device is less complex and easier to maintain than the prior art devices described, and still achieves good separation of the material to be fed onto the sintered belt.

A first significant difference from the prior art is that the feeder roller is not used in the present invention. Instead of a feeder roller, a series of extraction rollers are proposed which rotate about their central axis.

The axes of the extraction rollers and the separation rollers are perpendicular to the forward direction of the sintering belt.

The extraction rollers are placed in a plane below the discharge opening of the feed container, and the material to be sintered is conveyed from the feed container via the adjustable discharge gate via the rotation of the extraction rollers. These rollers have a much smaller diameter than conventional feeder rollers, so two to twenty extraction rollers can be placed below the discharge opening of the feeder container.

Because there is a gap between each of the rollers, the finer particulate material falls through the gaps on top of the sintering bed, while the coarser material is transported over the entire length of the extraction roller and the separation roller and deposited In the lower part of the sintering bed. In fact, since the sintered belt advances under the sintering machine feed device, the coarse material is first deposited to form the lower portion of the sintering bed. Because the sintered bed is partially formed as the sintered bed advances under the roller, the finer particulate material falling between the gaps of the rollers falls onto the top of the coarse material that has been fed to the sintering bed. A good separation of the material is thus reliably achieved.

The extraction rollers each have a diameter that preferably covers from 10% to 45% of the spout, more preferably from 15% to 40% of the spout, and optimally covers from 18% to 35% of the spout.

The extraction roller and/or the separation roller can have a minimum diameter of at least 50 mm. These rollers preferably have a maximum diameter of less than 500 mm. Preferably, the extraction roller and/or the separation roller have a diameter of at least 100 mm and less than 350 mm.

Preferably, all of the extraction rollers have the same diameter. Preferably, all of the separating rollers have the same diameter. More preferably, all of the rollers have the same diameter.

In a preferred embodiment, the diameter of the extraction roller is between 1.2 and 5 times larger than the diameter of the separation roller.

The discharge port is preferably measured to be 800 mm to 2000 mm. This means that, in the case where the shaft of the first roller is known to be substantially aligned with the first wall of the feed container, 11 rollers having a diameter of about 4 mm with a gap of about 4 mm between the rollers can be placed at about 800 mm. Below the discharge opening.

The rotation speeds of the extraction roller and the separation roller are individually adjustable, and preferably less than 100 rpm but at least 5 rpm. Preferably, the extraction roller and the separation roller rotate at a speed of less than 80 rpm but at least 10 rpm, more preferably less than 60 rpm. At least 12 rpm, and optimally less than 50 rpm but at least 15 rpm. The extraction roller and the separation roller can be driven by a single motor, or a separate electric motor can drive each roller. In the latter case, the speed of the rollers is individually adjustable.

In a preferred embodiment, the speed of rotation of the extraction roller is lower than the rotational speed of the separation roller.

If the rotational speed of the last extraction roller n _x at the discharge gate of the feed container is 100%, the rotational speeds of the rollers n _x-1 , n _x-2 and the like are decreased. In a preferred embodiment, the rotational speed of n ₁ (extraction roller opposite the discharge gate) is about 10%, preferably about 6% and most preferably about 2% of the rotational speed of n _x . A roller _n n _{+ 1} next to the roller and the wheel rotational speed difference between n _{and n} is greater than the rotational speed of the wheel n _n of about 5%, preferably from about 8% and most preferably about 10%.

The plane of the extraction roller preferably forms between 0 and +45 degrees with the horizontal plane Angle. More preferably, the angle of the extraction roller to the horizontal plane is between 0 and 20 degrees.

The plane of the separating roller preferably forms an angle with the horizontal plane between 0 and -70 degrees. More preferably, the angle of the separation roller from the horizontal plane is between 0 and -40 degrees.

According to a preferred embodiment, the extraction roller and the separation roller are in the same plane, i.e., the first plane is the same as the second plane.

Preferably, there is a gap of at least 1 mm between each of the rollers. This gap can be the same for all extraction rollers and the same for all separation rollers. In a preferred embodiment, the gap between the extraction rollers can be individually adjusted. The gap between each roller is preferably no more than 10 mm. More preferably, the gap between each of the rollers is preferably between 2 mm and 8 mm.

Another advantage of the present feed device is that different types of feeder containers can be used. In fact, in the case of prior art feeder rolls, it is necessary to use a feeder container having a funnel-shaped lower portion, and in the case of the present invention, a straight wall feeder container can be used. By extracting the rollers, the feeder container will be "collectively" empty, which means that the upper layer of material in the feeder container will remain substantially horizontal: during the use of the extraction roller to empty the feeder container, it will not be in the material. Form a funnel. Therefore, a larger capacity feeder container can be used or the device can be made more compact.

Since a straight walled feeder container can be used, the risk of depositing deposits inside the feeder container is minimized.

As will be understood, although not limited thereto, the proposed apparatus is particularly suitable for blast furnace plants as well as non-ferrous metal processing plants.

10‧‧‧Sintering machine feeding device

12‧‧‧ Feeding hopper

14‧‧‧ feeder roller

16‧‧‧ center axis

18‧‧‧Outlet

20‧‧‧Extracted materials

22‧‧‧Separation board

24‧‧‧Funnel-shaped lower end of the hopper

26‧‧‧ Vertical upper part of the hopper

28‧‧‧ Attachments

30‧‧‧Sintering belt conveyor

32‧‧‧Sintered belt

34‧‧‧Feed containers

36‧‧‧ Extraction wheel

38‧‧‧Adjustable discharge gate

40‧‧‧Separation roller

44‧‧‧Sintered bed

46‧‧‧ gap

48‧‧‧Scraper

50‧‧‧ first plane

52‧‧‧ second plane

54‧‧‧ vertical wall

56‧‧‧ upper surface

Further details and advantages of the present invention will become apparent from the following detailed description of the accompanying drawings, in which: FIG. 1 is a schematic view of a first prior art sintering machine feed apparatus.

Figure 2 illustrates a first embodiment of a sintering machine feed apparatus in accordance with the present invention, Figure 3 illustrates a second embodiment of a sintering machine feed apparatus in accordance with the present invention, and Figure 3A shows the extraction wheel of Figure 3 in more detail, Figure 4 A third embodiment of a sintering machine feeding device according to the present invention is illustrated. FIG. 5 illustrates a fourth embodiment of a sintering machine feeding device according to the present invention, the same reference numerals being used in all drawings to identify structural or functional Similar components.

A first conventional design of the sintering machine feed device 10 is depicted at FIG. A relatively large feeder drum 14 is mounted below the hopper 12 (storage bin, feed container) which rotates about its central axis 16 and thereby extracts material from the hopper 12. It has to be noted that in this type of feeding device 10, only one feeder drum 14 is used per hopper 12, and the diameter of the feeder drum 14 is much larger than the discharge port 18 of the hopper 12. The extracted material 20 is dropped onto a separator plate 22 which is positioned below the feeder drum 14 and serves to deflect the drop of the extracted material before the extracted material 20 landed on the sintering belt (not shown).

A similar sintering machine feed device is known from JP 2005 226113 A. A single relatively large feeder drum is mounted below the hopper 12 (storage, feed container), which rotates about its central axis and thereby extracts material from the hopper. The extracted material is dropped onto a separating plate in an embodiment as depicted in Figure 1 of JP 2005 226113 A, the separating plate being located Below the feeder drum and for deflecting the drop of the extracted material before the extracted material falls onto the sintered belt. In a second embodiment, as depicted in Figure 2 of JP 2005 226113 A, the extracted material falls onto a series of separating rollers that are positioned below the feeder drum and used to sinter on the extracted material. The drop of the extracted material is deflected prior to the belt and separated according to the size of the material being extracted. The peripheral speed of each roller or group of rollers is controlled such that the speed on the upstream side is higher than the speed on the downstream side.

These conventional devices have several disadvantages:

1. The diameter of the hopper 12 is not constant over its entire height, but is funnel-shaped at its lower end. Due to this funnel-shaped lower end 24, the material tends to adhere to the wall of the hopper 12 at the boundary between the funnel-shaped lower end of the hopper and the vertical upper portion 26, and the deposit 28 is formed there. This further reduces the useful diameter of the discharge opening 18 of the hopper 12 and the throughput of the material changes over time. Therefore, expensive maintenance work is required periodically to eliminate the buildup 28 from the hopper 12.

2. The material extracted from the hopper 12 may also adhere to the feeder drum 14, so the feeder drum must be scraped off any such material before the full rotation of the feeder drum 14 has occurred. This scraping of the feeder drum 14 will cause wear and eventually the drum must be replaced or repaired.

3. The material extracted from the hopper 12 first strikes the separation plate 22 or the separation roller before falling onto the sintered belt. If the feed contains agglomerates, the agglomerates may break during impact on the separator/roller and thus result in a lower quality of the sintered bed. Attachment (not shown) may also be formed on the separation plate/roller and especially at the point of impact, so that it will eventually be necessary to stop the feed to eliminate such deposits. Consequences are costly maintenance and/or performance losses.

To illustrate a first embodiment of the present invention, FIG. 2 shows a diagrammatic view of a belt sintering machine 10 having a design for use in a blast furnace plant (not shown in a blast furnace plant). A feed device for sintering feedstock. As seen in Figure 2, the sintered belt conveyor is depicted by reference numeral 30. Above the sintering belt 32, there is a feed container 34 for the material to be sintered and an extraction device for feeding the material to be sintered onto the sintering belt 32, which contains a discharge opening 18.

The extraction device in this particular embodiment includes four extraction rollers 36 located below the discharge opening 18 for extracting the material to be sintered from the feed container 34. These extraction rollers 36 rotate about their central axis 16 and thus convey material from the feed container via the adjustable discharge gate 38.

After having exited the adjustable discharge gate 38, the material to be sintered is received by a second series of rollers (five separation rollers 40) and deposited on the sintered belt 32 to form a sintered bed 44.

Interestingly, it has been noted that the material does not strike any of the separator plates, but the material is deposited smoothly onto the sintered belt. Therefore, the agglomerates contained in the feedstock will not be broken upon impact so that a better quality of the sintered bed can be achieved.

Another significant feature of the device is that some of the material passes vertically through the gap 46 between the extraction roller 36 and the separation roller 40. This fine particulate material will thus fall on top of the sintered bed 44 that has been deposited on the sintered belt 32, which is advanced under the feed container 34. The amount and size of material dropped through the gap 46 between the rollers 36, 40 on the sintering bed 44 depends on the size of the gap 46 between the rollers 36, 40, the rotational speed of the rollers 36, 40, and the rollers 36, 40. The relative rotational speed between.

Another feature of the device is that the rollers 36, 40 are self-cleaning. In fact, there is no need to install a scraper to scrape off any adhering material from the rollers as they clean themselves. In fact, any deposits formed on the rollers will be removed by the rotation of adjacent rollers.

A scraper 48 mounted downstream of the feed container 34 flattens the sintering bed 44 and scrapes off any excess material to obtain a sintered bed 44 having a predetermined height and having a horizontal surface.

3 shows another embodiment of a sintering machine feed device 10 in which seven extraction rollers 36 are used and numbered n ₁ , n ₂ , n ₃ to n _x . In this particular embodiment, the rotational speed of the extraction roller 36 is different, but the extraction roller n _{1 on} the left-hand side of Figure 3 rotates slower than the roller n ₂ located immediately to the right of the extraction roller n ₁ . The roller n ₂ rotates slower than the roller n ₃ , etc., so that the rotational speed of the roller is from the left hand side of FIG. 3 (ie, relative to the downstream side of the sintering belt) to the right hand side of FIG. 3 (ie, relative to The upstream side of the sintered belt is increased. Speed of the wheel n _n+1 The speed of the wheel n _n . This allows the material to be sintered to be emptied smoothly from the feed container.

In this particular embodiment as depicted on FIG. 3, the extraction roller is located in the first plane 50 and the separation roller is located in the second plane 52. The first plane 50 of the extraction roller 36 is horizontal, while the second plane 52 of the separation roller 40 is at an angle of about -45 to the horizontal. The particularity of this design of the sintering machine feed device 10 lies in the fact that the angle of the second plane 52 in which the separating roller 40 is located is adjustable. Due to the change in the angle of the separation roller, the quality of the separation can be affected.

Figure 3A shows the extraction rollers n1, n2 and n3 of Figure 3 in more detail and in particular shows the gaps D1, D2 and D3 between the rollers. Clearance D1 D2 D3 and so on. The fact that the gap can be increased from the left to the right of Figure 3 (i.e., from the first extraction roller to the last extraction roller near the discharge gate) allows the deposition of finer particulate material on top of the sinter, which is sintered. The object travels from the right hand side to the left hand side below the feed container. A good quality separation of the sintered bed is thus obtained.

In the embodiment depicted in Figure 4, the angle of the first plane 50 (i.e., the plane in which the extraction roller 36 is located) and the second plane 52 (i.e., the plane in which the separation roller 40 is located) The angles are all adjustable and can be changed independently. A better extraction of the material from the feed container can thus be achieved.

In the embodiment of Figure 5, the diameter of the extraction roller 36 is greater than the diameter of the separation roller 40, while in the other embodiments of the figures, the diameters of all of the rollers 36, 40 are the same.

In the embodiment of Figure 6, the first plane 50 of the extraction roller 36 and the second plane 52 of the separation roller 40 are horizontal.

In all of Figures 2 through 6, the feed container 34 has a straight vertical wall 54 and does not require a funnel-shaped lower portion as is the case with a conventional hopper using a roller feeder. The inclusions present in conventional hoppers are thus avoided because, in the configuration of the present invention, the feedstock "collectively" drops and the surface 56 of the feed material in the feed container 34 remains level.

In summary, it will be appreciated that the present invention not only allows for an important increase in the operational efficiency of the sinter furnace and non-iron operated sintering machine feed devices, but also allows for reliable operation at lower capital and operating expenses.

10‧‧‧Sintering machine feeding device

16‧‧‧ center axis

18‧‧‧Outlet

30‧‧‧Sintering belt conveyor

32‧‧‧Sintered belt

34‧‧‧Feed containers

36‧‧‧ Extraction wheel

38‧‧‧Adjustable discharge gate

40‧‧‧Separation roller

44‧‧‧Sintered bed

46‧‧‧ gap

48‧‧‧Scraper

Claims (15)

A sintering machine feeding device for feeding a sintering mixture to a belt sintering machine to form a sintering bed, the feeding device comprising a feeding container for receiving material to be sintered, for use A sintered material is loaded into a feeding device of the feed container, an extracting device for feeding the material to be sintered to the sintering belt, wherein the feeding container is provided with a discharge port for the material to be sintered The extracting device comprises: a plurality of extraction rollers located below the discharge opening for extracting the material to be sintered from the feeding container, the extraction rollers rotating around a central axis and each having a diameter The diameter covers 5% to 50% of the discharge port, and a plurality of separation rollers for separating the extracted material to be sintered and depositing the material onto the sintering belt, wherein the extraction rollers are located In a first plane, the separation rollers are located in a second plane. A feeding device for a belt sintering machine according to the first aspect of the invention, characterized in that the axes of the extraction rollers and the separating rollers are perpendicular to the forward direction of the sintering belt. A feeding device for a belt sintering machine according to any one of claims 1 to 2, wherein the extraction rollers and the separating rollers have a diameter of at least 50 mm. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the extraction rollers and the separating rollers have a diameter of less than 500 mm. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the diameter of the extraction rollers is between 1.2 and 5 times larger than the diameter of the separating rollers. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the extraction rollers and/or the separating rollers have a rotational speed of at least 5 rpm. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the extraction rollers and/or the separating rollers have a rotational speed of less than 100 rpm. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the rotational speeds of the extraction rollers and the separating rollers are individually adjustable. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the plane of the extraction rollers forms an angle between 0 and +45 degrees with the horizontal plane. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the plane of the separating rollers forms an angle between 0 and -70 degrees with the horizontal plane. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that there is a gap of at least 1 mm between each of the rollers. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that there is a gap of less than 10 mm between each of the rollers. A feeding device for a belt sintering machine according to claim 10, characterized in that the gap is the same for all of the extraction rollers. A feeding device for a belt sintering machine according to claim 10, characterized in that the gap is the same for all of the separating rollers. A feeding device for a belt sintering machine according to any one of the preceding claims, characterized in that the feeding container has a vertical wall.