KR20130137605A - Distribution chute - Google Patents

Abstract

The dispensing chute 10 in the form of a rotate-and-pivot has a waterway 22 having an inlet 20 for receiving the bulk material and an outlet 24 for discharging the bulk material. It includes a chute body 12 formed therein. In operation, bulk material is conveyed from the inlet to the outlet through the channel. The channel has a bend 28 for deflecting the direction of the material flow from the first flow direction in the suction section to the second flow direction in the discharge section. The chute body is constructed by assembling at least an upstream portion 14 including the suction portion and a downstream portion 16 including the discharge portion and fixed to the upstream portion. The downstream portion forms the straight portion of the channel, while the upstream portion forms the suction and bend of the channel. The upstream portion has a thicker wall than the downstream portion.

Description

Distribution chute

The present invention relates generally to dispensing chutes for use in bulk material dispensing apparatus for dispensing bulk material in a seal, such as a metallurgical reactor, more particularly in a furnace or the like. More particularly, the present invention relates to a dispensing chute having a chute body defining a channel consisting of a bent portion for deflecting the direction of the bulk material in the first flow direction, whereby the material has its suction part. After impinging on the chute in the chute, it immediately switches to the second direction and exits the chute outlet.

In the case of furnaces, filling facilities, often referred to as "bell-less" type, have been widely used. These filling facilities are arranged on top of the furnace, include a dispensing device, and have a dispensing chute as the main part. Generally, the dispensing device is configured to rotate the chute about a vertical furnace axis and to pivot the chute about a vertically horizontal axis. During the filling process, the bulk filler falls in the circumferential and radial directions by the rotational and pivoting positions while vertically falling onto the dispensing chute for dispensing the material. Thus, if desired, virtually any material fill profile can be established on the fill surface. Due to the large amount of bulk material that slides over the dispensing chute, abrasion effects are produced, and therefore the wear of the chute is significant and must be replaced regularly with a newly replaced chute. A widely used chute design is one known from European patent EP 0 640 539. The patent proposes a chute body that is straight and generally trough in the longitudinal direction, with special holding chambers that hold the bulk material layer on the chute to minimize wear.

The effect of further deepening the wear of the chute is that the angle of the material that hits the chute is relatively large when the chute is not close to its vertical position (center-filled posture). In other words, according to a general filling profile, a significant impact load can occur at most of the chute's pivot positions, which adds sliding frictional forces that cause grinding wear. In fact, in a conventional rectilinear straight chute such as that proposed in EP 0 640 539, the angle of material impact applied to the chute corresponds to the slope of the chute, thus ensuring an easy filling position at the outermost side. 50 ° (for vertical) will be far beyond.

Thus, in order to reduce the wear of the parts exposed to much wear, that is, the parts affected by the impact in the chute, the chute body deformed from the conventional straight chute body was removed. That is, in the case of the above chute, a more urgent angle is formed with respect to the vertical fall direction than with the discharge part, which determines the deflection (fill radius) in the radial flow. In other words, the flow direction after the impact is generally steeper than the flow direction at the outlet. Thus, through this chute, the flow deflection can be obtained almost the same while reducing the impact load considerably. Furthermore, the steeper the angle of impact, the slower the material flow. Thus, another advantage is that due to the higher discharge rate of the material at the outlet, the length of the chute is shorter, or the chute inclination angle is reduced (wear in the latter case is further reduced), nevertheless The same filling radius can be obtained.

Referring to the cases of Japanese patent applications JP 59-020412 and JP 59-031807, immediately after an impact on the chute, at the discharge portion, a bent portion for deflecting the flow direction from the first flow direction to the second flow direction is formed. Dispensing chute bodies forming a configured channel are known.

JP 59-020412 presents a generally trough shaped chute body with a generally straight (Fig. 2: AB) downstream and curved upstream (Fig. 2: CB), where the center of curvature is 0.5 relative to the chute length. A radius of -4.0 times, more preferably a radius of 0.5-3.0 times. Thus, the flow of filler material gradually changes direction as it passes through the curved chute. However, such curved manufacturing may be less economical or relatively weak in construction. A similar design is presented in JP 59-031807. The only difference between these trough-shaped chute bodies is that the upstream area consists of continuous straight pieces, which tangentially contact an arc with a radius of 0.5-4.0 times the chute length. Thus, while the pieces presented in JP 59-031807 are close to the curves of JP 59-020412, they may be more economical in terms of manufacturing.

For another chute body part, an example is shown in WO 2009/037508 where the downstream part is less steep than the upstream part. In the latter case, the chute generally has the configuration of a truncated cone and is suitable for a filling device called a "gimbal-type". Here, the chute swings in a cardanic fashion on two vertical horizontal axes. The chute is not compatible with rotary and swiveling filling devices, as well as more rapid wear at impact sites.

Despite the advantage that the service life is obviously increased due to reduced wear and potentially short chute lengths, the use of a dispensing chute with progrsesive material flow deflection as mentioned above is at least in the field of metallic reactors. Not much.

There are many reasons for this lack of hospitality, but in theory, it is possible to reliably withstand substantial loads on the chute, such as the weight of the filling material and the dynamic loads applied during the chute's rotation and swiveling operations. This is because there is a difficulty in providing a configuration of a chute body which is economical and sufficiently rigid to provide.

It is therefore an object of the present invention to provide a strong and economical configuration of a dispensing chute of the type having a chute body forming a flow channel with a bent upstream site.

In order to achieve the above technical problem, a dispensing chute according to the present invention, in the dispensing chute 10, for bulk material dispensing apparatus, in particular for a filling material dispensing apparatus for a metallurgical reactor, such as a shaft furnace. The chute comprises a chute body 12 having a waterway 22 having an inlet 20 for receiving a flow of bulk material and an outlet 24 for discharging the bulk material, the waterway ( 22 conveys the bulk material from the suction unit 20 to the discharge unit 24, and the water channel 22 discharges the flow direction in the first flow direction in the suction unit 20. A bend (28) bend for deflecting in a second direction within the part (24), said chute body (12) having at least an upstream portion (14) comprising said suction portion (20), and said discharge Assembly of a downstream portion 16 including a portion 24 and fixed to the upstream portion 14 And the downstream portion 16 forms a straight portion of the waterway 22, and the upstream portion 14 forms the suction portion 20 and the bend portion 28 of the waterway 22. The upstream portion is characterized in that it consists of a thick wall with respect to the downstream portion 16.

According to a preferred embodiment of the invention, the dispensing chute comprises an insert upstream and / or downstream, the insert comprising retaining chambers (bulbs) to fill the bulk material to protect the wear of the dispensing chute. The channel can be opened so that it can Preferably, the inserts are arranged to protect such surfaces with a stone box when the incoming bulk material flow is hit at an angle of at least about 30 °. In this way, it is possible to adequately protect certain areas of the surface with the water most likely to be weakened by the impinging material flow. It will be appreciated that the insert (s) can be replaced individually in the chute body once worn. Therefore, the use cost is low.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details and advantages of the present invention will become more apparent from the following description of the non-limiting but preferred embodiments with reference to the accompanying drawings.
1 is a perspective view for showing a dispensing chute according to a preferred embodiment of the present invention;
2 is a vertical sectional view of the filling device with the dispensing chute according to FIG. 1;
3 is a top view of the dispensing chute of FIG. 1.
Like reference numerals designate like elements throughout the drawings.

General description of the invention

The present invention proposes a dispensing chute of a rotate-and-pivot type. For example, it can be used in bulk material dispensing devices, such as for use in filling material dispensing devices in metallic reactors such as shaft furnaces. The dispensing chute includes a chute body (ie, a load-supporting structure of the dispensing chute) having a waterway therein including an inlet for receiving a bulk material flow and an outlet for discharging the bulk material. In operation, bulk material is conveyed from the inlet to the outlet through the channel. The channel has a bend to deflect the material flow from the first flow direction in the suction section to the second flow direction in the discharge section. According to the invention, the chute body consists of at least an assembly of an upstream part comprising an intake part and a downstream part comprising an outlet part and fixed to an upstream part (ie upstream and downstream parts are fixed with relative displacement). The downstream portion forms the straight portion of the channel, while the upstream portion forms the suction and bend of the channel. Furthermore, the upstream portion is made up of thick walls, and the downstream portion is thinner than that.

Those skilled in the art will appreciate that in the above dispensing chute, most of the load exerted by the impact bulk material onto the dispensing chute is handled by the upstream portion with the thick wall of the chute body. Since the upstream portion of the chute also includes a bend, the deflection force required to change the trajectory of the bulk material at the transition between the first and second flow directions is also exerted mostly by the upstream portion. Downstream of the chute, the material essentially follows a straight trajectory (in the chute's reference system). Therefore, the strength of the wall of the downstream part is chosen to be smaller than that of the upstream part. As a result, a dispensing chute with higher mechanical rigidity is provided, which, due to the configuration of the downstream radially outward, applies a lower torque to the chute bearing, making manufacturing economical.

In the present specification, the first flow direction corresponds to the overall tangential direction (vertical center plane of the dispensing chute) below the suction part, and the angle at which the bulk material flow impinges on the dispensing chute is at least as high as at least about 45 °. While having an angle, the second flow direction corresponds to the overall tangential direction (vertical center plane of the dispensing chute) below the outlet. Here, the "discharge angle" refers to the angle between the dispensing chute discharge part and the vertical direction.

According to a preferred embodiment of the present invention, the upstream portion is made of cast metal, ie cast metal or cast steel. Those skilled in the art will appreciate that casting techniques can be used to achieve upstream versatility. In other words, as compared with the prior art, the lower limit in the design of the chute makes it easier to tailor the chute body, use space and other variables for operation, depending on the application. Most preferably, the downstream portion comprises at least one welded curved steel plate.

Preferably, the suction portion of the dispensing chute is provided on the upstream portion in the form of an annular collar. The suction part is thus formed to have a tubular cross section (to enclose the axis of the suction part in the circumferential direction). The annular color strengthens the upstream portion and thus withstands high torque without significant deformation.

According to a preferred embodiment for the dispensing chute, the downstream part comprises a tubular cross section providing an outlet. Those skilled in the art will appreciate that this can reduce (or prevent) lateral flooding of the bulk material and consequently further control of fill distribution at the bottom of the chute. Most preferably, the downstream portion is tapered in the discharge direction at the point of engagement with the upstream portion.

Preferably, the channel has a first channel axis (corresponding to the first flow direction) in the suction part and a second channel axis (corresponding to the second flow direction) in the discharge part, with an angle between the upstream bends between them. Is formed. The angle is preferably in the range from 15 to 45 °, more preferably in the range from 20 to 40 °.

The upstream bend may be sharp (steep). Alternatively, the bent portion may form a curved transition portion between the bottoms of the suction portion and the discharge portion. It will be appreciated that in the upstream fabrication, three-dimensional curved surfaces can be easily formed using casting techniques.

For assembly of the upstream and downstream portions, the upstream portion includes a mating end opposite the suction portion (relative to the bend). The downstream portion is inserted into the mating end, for example up to the bend position, and is preferably fixed in position using screws, bolts, rivets, welding or other suitable fastening means. In order to increase the stability, the length of the overlapping portion between the joining end and the downstream portion is preferably at least 20%, for example, between 20 and 40% of the total length of the downstream portion.

According to a preferred embodiment of the invention, the dispensing chute comprises an insert upstream and / or downstream, the insert comprising retaining chambers (bulbs) to fill the bulk material to protect the wear of the dispensing chute. The channel can be opened so that it can Preferably, the inserts are arranged to protect such surfaces with a stone box when the incoming bulk material flow is hit at an angle of at least about 30 °. In this way, it is possible to adequately protect certain areas of the surface with the water most likely to be weakened by the impinging material flow. It will be appreciated that the insert (s) can be replaced individually in the chute body once worn. Therefore, the use cost is low. It will also be appreciated that the insert can be provided in the form of a cast or ceramic wear plate, rather than in the form of a holding chamber.

Preferably, the outlet of the dispensing chute is formed by a wear-resistant slide insert inside the downstream part. In contrast to the zone equipped with holding chambers, the slide form essentially smoothes the surface in the outlet, allowing the bulk material to be as concentrated and homogeneous as possible.

The chute body preferably has an opening on the inner side of the bend. By forming the opening in this way, for example, the weight of the chute can be reduced without deteriorating the wear resistance, and when the chute is substantially vertical (i.e., the discharge angle is less than about 15 °), the center filling is prevented. To this end, there is an advantage such that the "obstacle" for the entering bulk material is eliminated.

The dispensing chute may include handling trunnions on the upstream side to support the dispensing chute thereon by a tilting mechanism. The handling trunnion is preferably formed integrally with the upstream portion.

DETAILED DESCRIPTION OF THE DRAWINGS

1 shows a dispensing chute 10 according to a preferred embodiment of the present invention. The dispensing chute 10 includes a chute body 12 built in two structural parts; A cast-steel upstream portion 14 and a downstream portion 16 formed of a curved steel plate.

Outside the intake 20, the dispensing chute 10 may be suspended in the filling device via trunnions 18 integrally formed in the upstream portion 14. The suction part 20 consists of a tubular channel part (closed in the circumferential direction). One end opposite to the suction portion of the upstream portion 14 is composed of a coupling portion, and the downstream portion is fixed thereto. The upstream and downstream portions 14, 16 carry the bulk material entering the dispensing chute 10 through the inlet 20 to the outlet 24, whereupon the material is such as in the filling zone of the shaft furnace. Is discharged.

FIG. 2 shows a shaft furnace filling apparatus with the dispensing chute of FIG. 1. The bonsai chute 10 is suspended in the rotating structure 25 via its trunnions 18. The rotating structure 25 is rotatably supported in the fixed housing 30 by large diameter roller bearings 32. The inner race of the roller bearing 32 is fixed to the top flange 34 of the rotating structure 25, while the outer race of the roller bearing 32 is fixed to the top plate 36 of the stationary housing 30. do. The roller bearing 32 is configured such that the rotating structure 25 and also the distribution chute 10 can rotate about the vertical axis 38 substantially coincident with the furnace central axis. The central injection spout 26 is configured about the axis 38 and forms a passage through which the bulk material can pass through the top plate 36. The filling device of FIG. 2 is in the filling zone of the shaft furnace by rotating the dispensing chute 10 about the axis 38 and changing the pivot angle of the dispensing chute 10 about the pivot axis 39. Dispense the filling material. The pivot axis 39 is generally perpendicular to the axis 38. Mechanisms suitable for rotating and pivoting the dispensing chute 10 are not shown in detail or further described. See, eg, US 3,880,302, for such a mechanism.

When a bulk material (eg coke, ore, pellets, etc.) is fed through the dispensing spout 26 onto the dispensing chute 10, the material strikes the bottom of the waterway 22. The impact position depends on the tilting angle of the dispensing chute 10. When the discharge angle is high (hereinafter, the angle β between the velocity vector of the bulk material at the discharge section 24 of the dispensing chute 10 and the vertical axis 38), the bulk material has a number close to the suction section 20. Hit onto the floor When the discharge angle is lowered, the impact position moves away from the suction part 20 in the direction of the discharge part 24 of the chute 10. The channel 22 includes a bend 28 in the upstream portion 14 to progressively deflect the direction of the material striking the channel bottom in the suction portion 20 from vertical to discharge direction. The material striking the bottom of the channel in the suction 20 is first deflected in a first flow direction substantially parallel to the suction bottom. At the bend 28, the material is then deflected in a second flow direction parallel to the bottom of the outlet 24. The bend 28 has an angle α in the range of 20-40 degrees between the channel bottom of the inlet and the channel bottom of the outlet.

The downstream portion 16 and the upstream portion 14 are fixed to each other at the position of the engaging portion 40 of the upstream portion 14. The engagement portion 40 is positioned to face the suction portion 20 with respect to the bend portion 28. The upper end of the downstream part 16 is inserted into the coupling part 40 to the position of the bend 28 and fixed in that position. According to the example shown, the length of the portion where the coupling portion 40 and the downstream portion 16 overlap is about one third of the total length of the downstream portion 16.

As shown in FIGS. 2 and 3, the dispensing chute 10 includes a first insert 42 for forming the holding chambers in the upstream portion 14, and a first for forming the holding chambers in the downstream portion 16. 2 inserting portion (44). The holding chambers can be opened in the channel direction to fill the bulk material and thus protect the dispensing chute from wear. Inserts are placed in the area most impacted by the impacting bulk material. Each of the inserts 42, 44 includes a plurality of transverse plates 46 that are generally inclined opposite to the bulk material flow. In the transverse direction of the channel, one or more longitudinal plates 48 are provided for subdividing the holding chamber. For other upper configuration of the holding chambers see, for example, EP 0 640 539 and the like.

The outlet part 24 of the dispensing chute 10 consists of a wear resistant slide insert 50, which is arranged inside the downstream part 16. In contrast to the zone equipped with the holding chambers, the slide insert 50 forms an essentially smooth and slightly tapered channel in the outlet, thus making the bulk material as homogenous and homogeneous as possible. Can be discharged. The surface formed by the slide insert is essentially aligned with the upper edge of the longitudinal plate located downstream of the transverse plates 46 and the bend 28. The inclination of the discharge portion determines the discharge angle β, and can be changed within a range of about 10 ° (center filling position) to about 50 ° while turning about the pivot axis 39.

The chute body 12 has an opening 52 on the inner side of the bend 28. Referring to the vertical cross-sectional view of FIG. 2, as the openings 52 are disposed, grooves are formed thereby allowing the chute 10 to be touched without touching the radially inner edge portion 54 of the bottom flange of the rotating structure 25. The tilt angle may increase. Another advantage of the opening 52 is that when in the "central filled" position, the bulk material will fall straight through the chute 10 without substantially deflecting in the bend 28 by the channel 22 roof. Can be. In addition, the openings may even act as overflow at certain locations.

According to the dispensing chute as shown, the bend in the upstream portion corresponds to a steep transition point between the essentially straight channel portions. Those skilled in the art will appreciate that the bend may also be applied as a smooth curved transition point between the inlet and outlet internal channels bottoms.

While particular embodiments have been described in detail, those skilled in the art will appreciate that various modifications and alternatives may be made in light of the overall teachings of the present disclosure. Accordingly, the specific constructions described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which should be understood through the full scope of the appended claims and their equivalents.

Description of Symbols:

10: dispense chute 12: chute body

14: upstream 16: downstream

18: Handling trunnion 20: Suction part

22: channel 24: outlet

25: rotating structure 26: injection spout

28: bend part 30: fixed housing

32: roller bearing 34: top flange

36: upper plate 38: vertical axis

39: pivot 40: coupling part

42: first insert with retaining chamber 44: second insert with retaining chamber

46: transverse plate 48: longitudinal plate

50: slide insert 52: opening

54: bottom flange

Claims (15)

In the dispensing chute 10, for bulk material dispensing apparatus, in particular for filling material dispensing apparatus of a metallic reactor, such as a shaft furnace,
The distribution chute,
A chute body 12 having a waterway 22 having an inlet 20 for receiving a flow of bulk material and an outlet 24 for discharging said bulk material, said waterway 22 The bulk material from the suction unit 20 is conveyed to the discharge unit 24, and the water channel 22 directs the flow direction in the discharge direction 24 in the first flow direction in the suction unit 20. Bends (28, bend) for deflecting in the second direction therein,
The chute body 12 is composed of an assembly of an upstream portion 14 including at least the suction portion 20 and a downstream portion 16 including the discharge portion 24 and fixed to the upstream portion 14. The downstream portion 16 forms a straight portion of the waterway 22, and the upstream portion 14 forms the suction portion 20 and the bend portion 28 of the waterway 22. Dispensing chute (10), characterized in that the upstream portion consists of a thick wall with respect to the downstream portion (16).
The method of claim 1,
Dispensing chute (10), characterized in that the upstream portion (14) is made of cast metal, preferably cast iron or cast steel.
3. The method of claim 2,
Distributing chute (10), characterized in that the downstream portion (16) comprises at least one welded curved steel plate.
4. The method according to any one of claims 1 to 3,
Dispensing chute (10), characterized in that the suction part (20) is provided on the upstream part (14) in the form of an annular collar.
The method according to any one of claims 1 to 4,
The downstream chute (16) is characterized in that it comprises a tubular cross section which provides the outlet (24).
6. The method according to any one of claims 1 to 5,
Dispensing chute (10), characterized in that the downstream portion (16) is tapered in the direction of the discharge portion (24) at the engaging portion with the upstream portion (14).
7. The method according to any one of claims 1 to 6,
The water channel 22 includes a first channel shaft in the suction part 20 and a second channel shaft in the discharge part 24, and the bent part 28 in the upstream part has the first channel and the second channel. Dispensing chute (10), characterized in that it forms an angle between the axes, preferably in the range of 15-45 °, more preferably 20-40 °.
8. The method of claim 7,
Dispensing chute (10), characterized in that the bend (28) in the upstream portion (14) forms a curved transition between the first and second channel axes.
9. The method according to any one of claims 1 to 8,
The upstream portion 14,
A coupling end 40 opposite to the suction part 20 with respect to the bending part 28,
Dispensing chute (10), characterized in that the downstream portion (16) is inserted into the coupling end (40), preferably inserted and rises up to the bend (28).
The method of claim 9,
Dispensing chute (10), characterized in that the length of the overlapping portion of the coupling end (40) and the downstream portion (16) amounts to 20 to 40% of the total length of the downstream portion (16).
11. The method according to any one of claims 1 to 10,
Inserts 42, 44 in the upstream portion 14 and / or downstream portion 16, the inserts 42, 44 being open in the waterway direction to protect wear of the distribution chute 10; Dispensing chute (10), characterized in that it is capable of filling bulk material.
The method according to any one of claims 1 to 12,
The chute body (12) is characterized in that it comprises a wear-resistant slide insert (50) for forming the discharge portion (24) in the downstream portion (16).
14. The method according to any one of claims 1 to 13,
The chute body (12) is characterized in that it comprises an opening (52) on the inner side of the bend (28).
15. The method according to any one of claims 1 to 14,
Dispensing chute (10), characterized in that it comprises handling trunnions (18) formed on the upstream portion (14), preferably integrally with the upstream portion (14).
A metallurgical reactor, such as a shaft furnace, for example, comprising a charging installation with a filling material dispensing device having a dispensing chute (10) according to any of the preceding claims.

Images