Steam pipe protection mechanism for rotary dryers, rotary dryers

Abstract

To provide a rotating dryer that prevents an abrasion of a steam pipe by reducing a chance of contact between the steam pipe, which also functions as a scraping body, and a dried object, while preventing a flow of the dried object from being suppressed.SOLUTION: A steam pipe protection mechanism 40 of the rotating dryer comprises: a cylindrical housing 1 that rotates around a rotation axis, in which the dried object is stored; and a plurality of steam pipes 10, provided in the housing 1 respectively in both a radial direction and an axial direction at intervals, curved along a circumferential direction around the rotation axis, through which heated steam passes. The mechanism includes a main body part formed in a rectangular shape curved along a curve direction of the steam pipe 10, in which a discharge part is formed from which the dried object is discharged. Out of the plurality of steam pipes 10, the main body part is fixed on the plurality of steam pipes 10 formed with the same dimensions, positioned on an inner side in the radial direction and adjacent in the axial direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a steam pipe protection mechanism for a rotary dryer and a rotary dryer, and more particularly to a steam pipe protection mechanism for a rotary dryer that heats and dries objects to be dried with steam within a housing, and a rotary dryer. [Background technology]

[0002] In one process of metal refining, a rotary dryer is used to heat and dry the material to be dried, for example, copper concentrate. The rotary dryer has a cylindrical shell (housing) into which the copper concentrate is fed, and a steam pipe through which heated steam is supplied. The material to be dried fed into the shell is agitated within the shell by the steam pipe or agitator, and comes into contact with the steam pipe as it falls. When the material to be dried comes into contact with the steam pipe, heat from the steam pipe is transferred to the material. By repeatedly agitating the material to be dried and transferring heat from the steam pipe, the moisture content of the material to be dried is reduced, accelerating drying.

[0003] For example, Patent Document 1 discloses a steam pipe type rotary dryer. The steam pipe type rotary dryer has a drum (housing) into which the material to be dried is fed and a steam pipe through which steam, a heat medium, passes. The material to be dried is fed into the drum through an inlet for the material to be dried located upstream, and is lifted and falls as the drum rotates, coming into contact with the steam pipe during the falling process. As the material to be dried comes into contact with the steam pipe, the moisture content of the material to be dried decreases, accelerating drying, and the material is discharged from an outlet for the material to be dried located downstream.

[0004] Patent Document 2 discloses a rotary dryer. The rotary dryer is rotatably supported on a base via bearing members. The rotary dryer has a rotating drum into which materials to be dried are fed, and a plurality of scraping bodies are provided on the inner wall surface of the rotating drum. The materials to be dried are dried by contacting heated air circulating inside the rotating drum, and gradually move to the discharge side due to the inclination of the rotating drum. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 61-138084 [Patent Document 2] Japanese Utility Model Application Publication No. 51-122459 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the housing rotates repeatedly, and the objects to be dried are repeatedly lifted and dropped by the steam pipe as the housing rotates. If the objects to be dried come into contact with the steam pipe more often as they fall, the contact process causes the steam pipe to wear down, which is an inconvenience. This inconvenience is more pronounced around the outlet where the amount of objects to be dried increases.

[0007] Therefore, an object of the present invention is to provide a rotary dryer and a steam pipe protection mechanism for the rotary dryer that prevents wear on the steam pipe by reducing the chances of the steam pipe, which also functions as a scraper, coming into contact with the material to be dried, and that does not restrict the flow of the material to be dried. [Means for solving the problem]

[0008] The present invention provides a steam pipe protection mechanism for a rotary drying device comprising: a cylindrical housing that rotates around a rotation axis and accommodates materials to be dried; and a plurality of steam pipes that are provided in the housing at intervals in both the radial and axial directions, curved in a circumferential direction around the rotation axis, and through which heated steam passes; the mechanism further comprises a main body portion that is formed in a rectangular shape curved along the curved direction of the steam pipes, and that has a discharge portion through which the materials to be dried are discharged; the exhaust section is arranged side by side along a short side direction perpendicular to the longitudinal direction of the main body section, and has a plurality of openings formed corresponding to the plurality of steam pipes, The main body is located radially inside the plurality of steam pipes and is adjacent to the same steam pipe in the axial direction. Outer diameter The present invention is characterized in that the steam pipe is fixed to a plurality of steam pipes formed in the

[0009] In the steam pipe protection mechanism for a rotary dryer according to the present invention, beforeEach of the plurality of openings may be formed in the shape of an elongated hole extending in the longitudinal direction.

[0010] The present invention also provides a rotary drying apparatus comprising: a cylindrical housing that rotates around a rotation axis and accommodates materials to be dried; and a plurality of steam pipes that are provided in the housing at intervals in both the radial and axial directions, curved in a circumferential direction around the rotation axis, and through which heated steam passes; the rotary drying apparatus further comprises a protection mechanism having a main body that is formed in a rectangular shape curved along the curved direction of the steam pipes and in which a discharge section through which the materials to be dried are discharged is formed; the exhaust section is arranged side by side along a short side direction perpendicular to the longitudinal direction of the main body section, and has a plurality of openings formed corresponding to the plurality of steam pipes, The main body portion is located in the first four steam pipes from the inside in the radial direction among the plurality of steam pipes and is adjacent to the same steam pipe in the axial direction. Outer diameter The present invention is characterized in that the steam pipe is fixed to a plurality of steam pipes formed in the

[0011] The rotary drying device according to the present invention may further include a fixing part formed by a U-shaped bolt inserted into an insertion hole formed in the protection mechanism and nuts holding both ends of the U-shaped bolt, and the main body may be fixed to the steam pipe by the U-shaped bolt and the nuts. [Effects of the Invention]

[0012] According to the present invention, by reducing the chances of the steam pipe, which also functions as a scraper, coming into contact with the material to be dried, it is possible to prevent wear on the steam pipe and not inhibit the flow of the material to be dried. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic side view of a rotary dryer according to an embodiment of the present invention; [Figure 2] 1 is a schematic view of a rotary dryer according to an embodiment of the present invention, viewed from the outlet side; [Figure 3] FIG. 2 is a partially enlarged view of the vicinity of an outlet of the rotary drying device according to the embodiment of the present invention. [Figure 4] FIG. 2 is a perspective view of a protector used in the rotary drying device according to the embodiment of the present invention. [Figure 5] Figure 5(a) is a diagram showing the protector attached to the steam pipe as viewed from the radially inner side, and Figure 5(b) is a diagram showing the protector attached to the steam pipe as viewed from the width direction. [Figure 6] FIG. 4 is a schematic diagram showing a state in which copper concentrate passes through an opening formed in a protector. DETAILED DESCRIPTION OF THE INVENTION

[0014] First, a rotary dryer according to an embodiment of the present invention will be described. Common components will be denoted by common reference numerals in the drawings. It goes without saying that the present invention is not limited to the following example, and can be modified as desired without departing from the spirit and scope of the present invention.

[0015] FIG. 1 is a side view schematically illustrating a rotary dryer according to an embodiment. The rotary dryer 100 includes a housing 1, a steam pipe 10, and a heating pipe 20 provided within the housing. The housing 1 has a cylindrical shape with a rotation axis X extending in the front-to-rear direction and rotates around the rotation axis X. The housing 1 accommodates copper concentrate as the material to be dried, and one side (the right side in the figure) is a supply port 1a, and the other side (the left side in the figure) is a discharge port 1b. The housing 1 is mounted on a base 2 via a bearing member 3 so that the discharge port 1b is lower than the supply port 1a. That is, the housing 1 is inclined so that the discharge port 1b is relatively lower than the supply port 1a. Due to the inclination of the housing 1, copper concentrate supplied from the supply port 1a is fed toward the discharge port 1b and discharged from the discharge port 1b. In the following embodiment, the X-axis direction is the front-to-rear direction, the Y-axis direction is the left-to-right direction, and the Z-axis direction is the up-and-down direction.

[0016] FIG. 2 is a schematic diagram of a rotary dryer 100 according to an embodiment, viewed from the axial direction of the rotation axis X. Within the casing 1, which rotates counterclockwise as viewed from the exhaust port 1b side, a plurality of steam pipes 10 are arranged radially and in the direction of the rotation axis X. Specifically, the steam pipes 10 are configured to include a first steam pipe 11, a second steam pipe 12, a third steam pipe 13, a fourth steam pipe 14, a fifth steam pipe 15, a sixth steam pipe 16, a seventh steam pipe 17, an eighth steam pipe 18, and a ninth steam pipe 19, arranged from the radially inner side to the outer periphery of the casing 1. These steam pipes are arranged at substantially equal intervals from the radially inner side to the outer periphery, except near the rotation axis X, and are arranged in plurality along the direction of the rotation axis X (the depth direction of the page). In the following description, when the first steam pipe 11 to the ninth steam pipe 19 are not particularly distinguished from one another, they will be simply referred to as "steam pipes 10." The number of steam pipes 10 arranged radially and in the direction of the rotation axis X is not particularly limited.

[0017] As shown in FIG. 2 , a plurality of steam pipes 10 having different diameters and formed concentrically are arranged around the rotation axis X. Furthermore, a plurality of steam pipes 10 having the same radius and formed concentrically are arranged in the direction of the rotation axis X (depth direction in the plane of the drawing). That is, the plurality of steam pipes 10 are arranged at intervals in both the radial and axial directions, and are formed to have the same dimensions along the axial direction. Note that the number of steam pipes 10 arranged in the radial and rotation axis X directions is not particularly limited. Each steam pipe 10 is supported in the circumferential direction by five support members 30 and curved along the circumferential direction around the rotation axis X. Each steam pipe 10 is formed integrally around the entire circumferential direction, or may be formed as five separate pipes in the circumferential direction by the support members 30.

[0018] Here, the steam pipe 10 is a cylindrical member (tube) used in a so-called indirect dryer, through which heated steam (heated steam) passes. When the copper concentrate comes into contact with the steam pipe 10 in the housing 1, the copper concentrate in contact with the steam pipe 10 is heated, and the temperature increase promotes drying of the copper concentrate. The longer the contact time between the copper concentrate and the steam pipe 10, the more the drying of the copper concentrate is promoted. The steam pipe 10 is preferably made of a metal mainly composed of, for example, iron.

[0019] 3 is a partially enlarged view of the vicinity of the discharge port 1b in the housing 1. Copper concentrate C supplied from the upstream side in the supply direction (the supply port 1a side) gradually moves downstream while rotating within the housing 1 and is discharged from the discharge port 1b side. Just before being discharged from the discharge port 1b, the copper concentrate C supplied from the upstream side is deposited near the discharge port 1b, and the deposited copper concentrate C is stirred up by the steam pipe 10 as the housing 1 rotates, as indicated by the arrow in the figure. The stirred-up copper concentrate C falls from above into the steam pipe 10, making the upper side of the steam pipe 10 prone to wear. Therefore, a protector 40 is attached to the steam pipe 10 to prevent wear on the steam pipe 10.

[0020] 3 shows a state in which protectors 40 are attached to the first four steam pipes 10 from the inside to the outside in the radial direction, and protectors 40 are attached as protective mechanisms to the first four steam pipes 10 from the inside in the radial direction along the rotation axis X from the downstream side to the upstream side in the supply direction, i.e., along the rotation axis X direction. This is because the amount of copper concentrate C deposited increases further downstream in the supply direction, and the further radially inward the steam pipes 10 are, the more likely they are to come into contact with the falling copper concentrate C. Therefore, it is more important to protect the steam pipes 10 arranged in these locations. Note that the number of protectors 40 attached in the radial direction and in the rotation axis X direction is not particularly limited.

[0021] The protector 40 is fixed to a plurality of steam pipes 10 that are adjacent in the axial direction and formed to have the same dimensions. Specifically, as shown in Fig. 3, the protector 40 is attached across a plurality of steam pipes 10 that have the same radius along the direction of the rotation axis X. In the embodiment, the protector 40 is attached across two steam pipes 10, but may be attached across three or more steam pipes 10.

[0022] Fig. 4 shows a schematic perspective view of the protector 40. As shown in Fig. 4, the protector 40 has a main body 40a formed in a rectangular shape that is curved along the curvature direction of the steam pipe 10. The main body 40a is formed to a size that allows it to be attached to multiple steam pipes 10. The protector 40 is made of a heat-resistant metal such as iron. The protector 40 may be made of any material that is resistant to heat.

[0023] The protector 40 is formed with a plurality of discharge sections 50, through which the copper concentrate to be dried is discharged, along a lateral direction perpendicular to the longitudinal direction of the main body 40a. Specifically, the discharge sections 50 have a first discharge section 51, a second discharge section 52, and a third discharge section 53, arranged in this order along the longitudinal direction of the main body 40a. The first discharge section 51 has two openings 51a in the lateral direction (width direction of the main body 40a). The second discharge section 52 has two openings 52a in the lateral direction. The third discharge section 53 has two openings 53a in the lateral direction. The openings 51a, 52a, and 53a are each formed as elongated holes extending in the longitudinal direction.

[0024] The number of discharge portions 50 formed in the longitudinal direction is not particularly limited. Furthermore, it is desirable that the number of openings that the discharge portion 50 has in the short direction be the same as the number of steam pipes 10 to which the protector 40 is attached. That is, it is desirable that the multiple openings that the discharge portion 50 has are formed corresponding to each of the steam pipes 10 to which the protector 40 is attached. However, the number of openings that the discharge portion 50 has may be different from the number of steam pipes 10. A plurality of insertion holes 40c into which U-bolts, which will be described later, are inserted, are formed on both sides of the discharge portion 50 along the width direction.

[0025] 4, the opening area of ​​the second discharge portion 52 is larger than those of the first discharge portion 51 and the third discharge portion 53, but the opening area of ​​the discharge portion 50 is not particularly limited. Furthermore, if the opening area of ​​the first discharge portion 51 is large, the second discharge portion 52 and the third discharge portion 53 do not need to be formed in the protector 40. In other words, if the opening area of ​​the opening 51a of the first discharge portion 51 is large, the discharge portion 50 formed in the protector 40 may be one.

[0026] FIG. 5 shows a state in which protectors 40 are attached to steam pipes 10. As shown in FIG. 5(a), as an example, protectors 40 are attached to the first four steam pipes 10 counting from the inside in the radial direction. This is because, as described above, steam pipes 10 located closer to the inside in the radial direction are more likely to come into contact with copper concentrate and therefore more susceptible to wear, and therefore need to be protected more than steam pipes 10 located closer to the outside in the radial direction. In addition, protectors 40 are attached to two steam pipes 10 in the direction of the rotation axis X (the vertical direction on the page). However, protectors 40 may be attached to three or more steam pipes 10. Attaching protectors 40 to multiple steam pipes 10 can prevent copper concentrate from coming into contact with and wearing the steam pipes 10. The protectors 40 are fixed to the steam pipes 10 by fixing parts 60, which will be described later.

[0027] When the protector 40 is attached to the two steam pipes 10, a gap is formed between the steam pipe 10 and the protector 40 through which copper concentrate passes, and the steam pipe 10 is in communication with the outside via the openings 51a, 52a, and 53a. That is, when viewed from the radial direction, it is desirable that the steam pipe 10 does not overlap with the first discharge section 51, the second discharge section 52, and the third discharge section 53. This allows the copper concentrate scraped up between the steam pipe 10 and the protector 40 near the discharge port 1b to move radially inward via the protector 40. Therefore, the flow of copper concentrate can be permitted via the protector 40.

[0028] FIG. 5(b) is a view from the width direction of the protector 40 attached to the steam pipe 10. One protector 40 is attached across two steam pipes 10. Each steam pipe 10 is fixed to the protector 40 by a fixing part 60 composed of a U-bolt 61 and a nut 62. As shown in FIG. 5(b), the U-bolt 61 is inserted into the insertion hole 40c, and both ends of the U-bolt 61 are held by nuts 62. The main body 40a of the protector 40 is fixed to the steam pipe 10 by the U-bolt 61 and the nut 62. The U-bolt 61 has a semicircular curved shape, and is attached to the steam pipe 10 so that the curved part follows the curved surface of the steam pipe 10. Because the protector 40 is attached to the steam pipe 10 by the U-bolt 61, the protector 40 is reliably fixed in the radial direction.

[0029] FIG. 6 is a schematic diagram showing copper concentrate C (the portion indicated by dots in FIG. 6) passing through a discharge section 50 formed in the protector 40. As shown in FIG. 6, when copper concentrate C falls from a state where it has been scraped up, i.e., a state where it is located radially inward of the protector 40, the copper concentrate C is discharged radially inward (in the direction of the arrows in the figure) through each of the first discharge section 51, second discharge section 52, and third discharge section 53. In this case, the steam pipe 10 and each of the first discharge section 51, second discharge section 52, and third discharge section 53 are positioned so as not to overlap in the radial direction. Therefore, even when the protector 40 is attached to protect the steam pipe 10, the flow of copper refining is not inhibited.

[0030] As described above, in the rotary dryer 100 according to the embodiment, a plurality of steam pipes 10 are provided in the housing 1 at intervals in both the radial direction and the direction of the rotation axis X, and each steam pipe 10 is curved circumferentially around the rotation axis X. The protector 40 is fixed by a fixing portion 60 across two or more steam pipes 10 that are located radially inside the plurality of steam pipes 10 and are formed concentrically and have the same radius, and the protector 40 is formed with a discharge portion 50 through which the copper concentrate to be dried is discharged. Therefore, the protector 40 can prevent the copper concentrate from contacting and wearing the steam pipes 10, and can also allow the copper concentrate to flow through the protector 40.

[0031] Although one embodiment and example of the present invention have been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the novel features and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

[0032] For example, a term that is described at least once in the specification or drawings together with a different term having a broader or equivalent meaning can be replaced with that different term anywhere in the specification or drawings. Furthermore, the configuration of the rotary dryer is not limited to that described in the embodiment and examples of the present invention, and various modifications are possible. [Explanation of symbols]

[0033] 1 housing, 10, 11 to 19 steam pipe, 20 heating pipe, 30 support member, 40 protector (steam pipe protection mechanism), 40a main body, 50 to 53 exhaust part, 51a, 52a, 53a opening, 60 fixing part, 61 U-bolt, 62 nut, 100 rotary dryer

Claims

1. A steam pipe protection mechanism for a rotary dryer comprising: a cylindrical housing that rotates around a rotation axis and accommodates an object to be dried; and a plurality of steam pipes that are provided in the housing at intervals in both the radial direction and the axial direction, curved in a circumferential direction around the rotation axis, and through which heated steam passes, a main body formed in a rectangular shape curved along the curvature direction of the steam pipe, and having a discharge portion through which the material to be dried is discharged; the exhaust section is arranged side by side along a short side direction perpendicular to the longitudinal direction of the main body section, and has a plurality of openings formed corresponding to the plurality of steam pipes, a main body portion fixed to a plurality of steam pipes that are located radially inside the plurality of steam pipes and that have the same outer diameter and are adjacent to each other in the axial direction.

2. A steam pipe protection mechanism for a rotary drying device as described in Claim 1, characterized in that each of the multiple openings is formed in the shape of a long hole extending in the longitudinal direction.

3. A rotary drying apparatus comprising: a cylindrical housing that rotates around a rotation axis and that houses an object to be dried; and a plurality of steam pipes that are provided in the housing at intervals in both the radial direction and the axial direction, that curve in a circumferential direction around the rotation axis, and through which heated steam passes, a protection mechanism having a main body formed in a rectangular shape curved along the curvature direction of the steam pipe, and in which a discharge portion through which the material to be dried is discharged is formed; the exhaust section is arranged side by side along a short side direction perpendicular to the longitudinal direction of the main body section, and has a plurality of openings formed corresponding to the plurality of steam pipes, a rotary drying device characterized in that the main body portion is fixed to a plurality of steam pipes that are located up to the fourth steam pipes from the inside in the radial direction and that are adjacent to each other in the axial direction and have the same outer diameter.

4. a fixing portion including a U-bolt inserted into an insertion hole formed in the protection mechanism and nuts for holding both ends of the U-bolt; 4. The rotary drying apparatus according to claim 3, wherein the main body is fixed to the steam pipe by the U-bolt and the nut.

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