WO2022172513A1

WO2022172513A1 - Drying device

Info

Publication number: WO2022172513A1
Application number: PCT/JP2021/039138
Authority: WO
Inventors: 弘毅遠藤; 星辰林
Original assignee: 三菱重工環境・化学エンジニアリング株式会社
Priority date: 2021-02-12
Filing date: 2021-10-22
Publication date: 2022-08-18
Also published as: JP2022123276A; JP6955120B1

Abstract

This drying device (1) has: a casing (2), in which the front part is provided with an introduction port (2b) through which a water-containing material (P) is introduced; a plurality of rotating shafts (3) provided so as to be capable of rotating around an axis (O1) that extends from the front part to the rear part of the casing (2); a plurality of disks (4) that are disposed at intervals on the outer peripheral surfaces of the rotating shafts (3) and that scoop up the water-containing material (P) having a prescribed water content; a discharge port (2c), which is provided in the bottom surface of the rear part of the casing (2) and through which the water-containing material (P) is discharged; and a movable weir (10) that is disposed at the front end of the discharge port (2c) and provided with a first shielding plate (11), of which the rotating-shaft (3)-side end part is formed in the shape of a recess conforming to part of the outer peripheral shape of the rotating shaft (3). The first shielding plate (11) is capable of moving between a restricting position, at which the first shielding plate (11) protrudes toward the rotating shaft (3) and restricts the discharge of the water-containing material (P) to the discharge port (2c), and a non-restricting position, at which the first shielding plate (11) remains inside the discharge port (2c) and does not restrict the discharge of the water-containing material (P).

Description

drying equipment

The present invention relates to a drying apparatus equipped with multi-axis, particularly two-axis or four-axis rotating shafts, for agitating and transporting a hydrous material while heating it.

Conventionally, drying equipment is known that heats water-containing materials such as various biomass and waste (sludge) to be processed, turns them into granules, and discharges them. For example, in Patent Document 1, an inlet into which a hydrous material is introduced, two sets of rotating shaft sets, a pair of side discharge ports for discharging the hydrous material that has been dried to powder and granular material, and insufficient drying A drying apparatus is disclosed having a bottom outlet for discharging wet matter. In this drying device, when the water-containing material is dried to the granular material, the powder is discharged from the pair of side discharge ports, and when the water-containing material is not dried to the granular material, no weir is formed around it. It is discharged from the bottom discharge port and returned to the input port. That is, the insufficiently dried water-containing material is not discharged out of the apparatus and is re-introduced into the inlet, so that only the sufficiently dried powder is discharged from the side outlet.

Japanese Patent No. 6260071

Conventionally, as in the above Patent Document 1, the hydrous material was dried until it became powdery particles with a moisture content of about 30% or less before being discharged. , there is a need to discharge a water-containing material having a water content of about 60%. Water-containing substances such as sludge become highly viscous at a water content of about 60%. and clogs the outlet, making it impossible to discharge the water-containing material to the outside of the casing. In addition, in a configuration in which a discharge port for discharging incompletely dried water-containing material is provided on the bottom surface and no weir is provided around the discharge port, when discharging the water-containing material, the fluidity of the water content higher than 60% Since some water-containing substances may also be mixed and discharged, a drying apparatus with a new structure for discharging water-containing substances with a predetermined (about 60%) water content was required.

Therefore, it is an object of the present invention to provide a drying device that conveys a water-containing material that becomes highly viscous within a predetermined water content range to a discharge port and discharges the water-containing material at a predetermined water content.

The drying apparatus of the present invention comprises a casing having an inlet at the front for charging a water-containing material, a plurality of rotating shafts rotatably provided around an axis extending from the front to the rear of the casing, and the a plurality of discs arranged at intervals on the outer peripheral surface of the rotating shaft for scooping up the water-containing material having a predetermined water content; a discharge port provided on the bottom surface of the rear portion of the casing for discharging the water-containing material; A movable weir is provided at the front end of the discharge port and has a first shielding plate whose end on the rotating shaft side is formed in a concave shape along a part of the outer peripheral shape of the rotating shaft.
The first shielding plate protrudes toward the rotating shaft and has a restricted position that restricts discharge of the water-containing material to the discharge port, and an unrestricted position that does not restrict discharge of the water-containing material within the discharge port. It is possible to move between
The movable weir further includes a discharge adjustment mechanism that is provided on the side of the discharge port and that can protrude from the side surface of the casing toward the rotating shaft on the side closer to the side surface.

According to the present invention, it is possible to convey a water-containing material that becomes highly viscous within a predetermined water content range to the outlet and discharge it at a predetermined water content.

It is sectional drawing seen from the side of the drying apparatus which concerns on 1st embodiment and 2nd embodiment. It is a sectional view seen from the upper part of a drying device concerning a first embodiment. It is a perspective view of the rotating shaft and the disc which were accommodated in the inside of the drying apparatus which concerns on 1st embodiment. FIG. 2 is a cross-sectional view of the drying device according to the first embodiment viewed from the axial direction (a cross-sectional view taken along line AA in FIG. 2). FIG. 2 is a cross-sectional view of the drying apparatus according to the first embodiment viewed from the axial direction (cross-sectional view taken along line BB in FIG. 2). FIG. 3 is a cross-sectional view of the drying device according to the first embodiment viewed from the axial direction (a cross-sectional view taken along line CC in FIG. 2). FIG. 3 is a perspective view of a discharge adjustment mechanism accommodated inside the drying apparatus according to the first embodiment; It is the sectional view seen from the upper part of the drying device concerning a second embodiment. FIG. 9 is a cross-sectional view of the drying device according to the second embodiment viewed from the axial direction (cross-sectional view taken along line DD in FIG. 8). FIG. 9 is a cross-sectional view of the drying apparatus according to the second embodiment viewed from the axial direction (cross-sectional view taken along line EE in FIG. 8). It is a figure explaining the property of a hydrous material. 10 is a modified example of the second shielding plate of the drying apparatus shown in FIG. 9. FIG.

Hereinafter, the drying apparatus of the present invention will be described with reference to FIGS. 1 to 12. FIG. The configurations and the like shown below are merely examples, and are not intended to exclude various modifications and application of techniques that are not explicitly stated. Each configuration shown in the embodiment and modifications can be modified in various ways without departing from the scope of the invention. In addition, each configuration can be selected or combined as necessary, except for the essential constituent elements of the present invention.
The drying apparatus of the present invention stirs and conveys fluid P, such as sewage sludge, industrial waste sludge, food waste/kitchen waste, night soil sludge, livestock manure, plant lees, and various other biomass and waste materials. It is a device for discharging a water-containing material P that is dried by heating (reducing the water content) and becomes highly viscous within a predetermined range of water content.
In the drying apparatus of the present invention, in order to discharge from the casing the water-containing material P that becomes highly viscous within a predetermined moisture content range, the water-containing material P near the discharge port at the bottom of the casing and the water-containing material P near the discharge port reach a predetermined water content. and a movable weir for restricting discharge of water-containing material P.
First, as a first embodiment, the overall configuration of a drying apparatus having two rotating shafts will be described, and then the characteristic configuration of the present invention will be described in detail. Furthermore, in the second embodiment, a drying apparatus having four rotating shafts will be described in detail, centering on the configuration different from that of the first embodiment.

(First embodiment)
[1. Overall configuration of drying device]
As shown in FIGS. 1 to 4, the drying apparatus 1 according to the present embodiment includes a casing 2, which is a container having a trough 2a having a substantially U-shaped cross section, and a jacket for heating the casing 2 (and thus the water-containing material P). 9 and a motor or the like are provided so as to pass through the casing 2 from the front side Xf in the front-rear direction X (upstream side in the conveying direction of the water-containing material P) to the rear side Xr (downstream side in the conveying direction of the water-containing material P). A plurality of rotating shafts 3 rotatably provided around the axis O1 by the rotation driving device 8, and the inner peripheral end is connected to the outer peripheral surface of the rotating shaft 3, and protrudes in the radial direction of the axis O1 of the rotating shaft 3. It also has a plurality of discs 4 extending in the circumferential direction and formed in a substantially fan shape.

The casing 2 is provided with an inlet 2b into which the hydrous material P is introduced on the ceiling surface on the front side Xf and an outlet 2c through which the hydrous material P is discharged on the bottom surface on the rear side Xr. , and is inclined at a predetermined inclination angle together with the rotating shaft 3 .
The input port 2b is configured by connecting a pipe, duct, or the like for inputting the hydrated material P to an opening formed in a shape such as a circle, an ellipse, or a rectangle when viewed from above. The moisture content of the hydrous material P when it is introduced from the inlet 2b is about 80%.
On the other hand, the discharge port 2c is configured by connecting a duct, a pipe, or the like for discharging the water-containing material P to an opening formed in a substantially rectangular shape when viewed from above. The water content of the water-containing material P when it is discharged from the discharge port 2c is about 60%. The drying apparatus 1 has two rotating shafts 3 arranged in parallel inside a casing 2 . These two rotating shafts 3 are rotatable in directions opposite to each other and rotatable in the same direction. Normally, the two rotating shafts 3 rotate in the same direction when viewed from the direction of the axis O1. That is, one rotating shaft 3A rotates in a direction in which its upper portion moves toward the other rotating shaft 3B, and the other rotating shaft 3B rotates in a direction in which its upper portion moves away from one rotating shaft 3A.

The discs 4 are provided two by two at the same position in the direction of the axis O1 of each rotating shaft 3 with a predetermined gap (circulation opening) in the circumferential direction around the center of the axis O1. Two disks 4 arranged at the same position in the direction of the axis O1 form one stage, and the disks 4 are arranged in a plurality of stages from the front side Xf to the rear side Xr at predetermined intervals in the direction of the axis O1. . At this time, a predetermined gap formed between the two discs 4 in each stage serves as a channel opening 5 for circulating the water-containing material P from the front side Xf of the casing 2 to the rear side Xr. Although not shown, the rotating shaft 3 and the disk 4 are hollow, and a heating fluid such as steam, thermal oil, and hot water is circulated inside to heat the water-containing material P that comes into contact with them. It is

Of the two rotating shafts 3, the discs 4A provided on one of the rotating shafts 3A and the discs 4B provided on the other rotating shaft 3B are alternately arranged with a predetermined gap in the direction of the axis O1. there is The disk 4A provided on one rotating shaft 3A and the disk 4B provided on the other rotating shaft 3B are arranged in the radial direction when viewed from the direction of the axis O1 when the two rotating shafts 3 are rotating. It is arranged so that a part overlaps. That is, the discs 4A provided on one rotating shaft 3A can pass between the stages of discs 4B provided on the other rotating shaft 3B, and the discs 4B provided on the other rotating shaft 3B can pass between the discs 4A of each stage provided on the rotary shaft 3A.
Further, the disk 4A provided on one rotating shaft 3A and the disk 4B provided on the other rotating shaft 3B are formed to extend in the circumferential direction, and are directed forward in the rotational direction when viewed from the radially outer side. It has a wedge shape that narrows as it goes.

Each of the discs 4 adjacent in the direction of the axis O1 has a side surface 4e, which is an inclined surface forming a wedge shape, with a facing portion 4f that faces each other in the direction of the axis O1. Discs 4 adjacent to each other in the direction of axis O<b>1 are arranged so as to be out of phase with each other in the circumferential direction of rotating shaft 3 . More specifically, the discs 4 in stages adjacent to each other in the direction of the axis O1 are arranged so as to be out of phase in the circumferential direction.
Note that the disk 4 arranged on the downstream side from the discharge port 2c may have a rectangular shape having the same width in the direction of rotation when viewed from the outside in the radial direction instead of the wedge shape.

The disc 4 has paddle portions that protrude on both sides in the direction of the axis O1. The paddle part includes a first paddle part 6 and a second paddle part 7 arranged at different positions in the rotational direction. One disc 4A comprises a first paddle portion 6A and a second paddle portion 7A, and the other disc 4B comprises a first paddle portion 6B and a second paddle portion 7B.
For example, the first paddle portion 6 is provided at the rear end portion of each disk 4 in the rotation direction, and the second paddle portion 7 is provided at the intermediate portion ahead of the first paddle portion 6 in the rotation direction. It is preferable that the second paddle portions 7 are arranged corresponding to the arrangement of the first paddle portions 6 of the discs 4 adjacent to each other.

The first paddle portion 6 and the second paddle portion 7 are formed to protrude toward the opposing portions 4f of the discs 4 adjacent to each other in the direction of the axis O1. The second paddle portions 7 are arranged in the same phase so that the ends of the first paddle portions 6 of the discs 4 adjacent to each other in the direction of the axis O1 face each other.
The first paddle portion 6 and the second paddle portion 7 are provided with

surfaces

6f and 7f facing forward in the rotation direction, respectively, at portions projecting from both sides in the direction of the axis O1. The first paddle portion 6 and the second paddle portion 7 can catch the highly viscous water-containing substance P existing between the discs 4 adjacent to each other in the direction of the axis O1 by the

surfaces

6f and 7f facing forward in the rotational direction. ing. As a result, the plurality of disks 4 scoop up the water-containing material P having a predetermined water content. That is, the highly fluid water-containing material P introduced from the inlet 2b is indirectly heated by the heat medium (steam) passing through the rotating shaft 3 and the casing 2 while being stirred by the rotating shaft 3 and the disc 4, and (approximately 60%) and becomes a highly viscous water-containing material P, which is then discharged from the discharge port 2c.

[2. Main configuration of drying device]
As shown in FIGS. 1 and 2, the drying device 1 includes the casing 2, the plurality of rotating shafts 3, the plurality of disks 4, and the discharge port 2c of the casing 2. In addition, the drying device 1 is arranged at the front end of the discharge port 2c and rotates. It is a movable weir having the function of restricting the inflow of water-containing material P by including a first shielding plate 11 formed in a concave shape along a part of the outer peripheral shape of the rotating shaft 3 at the end on the shaft 3 side. It is composed of a movable weir 10 .

As shown in FIG. 5, the first shielding plate 11 separates the space between the pair of rotating shafts 3 and the space below each rotating shaft 3 toward the center in the width direction W from the front end of the discharge port 2c. It is a plate-shaped member that closes on the side. The concave portions are provided on both sides in the width direction W of the end (upper end) of the first shielding plate 11 on the rotating shaft 3 side. That is, the first shielding plate 11 has a shape in which two upper corners of a rectangle are notched in a substantially arc shape when viewed from the direction of the axis O1. The width direction W is a direction perpendicular to both the up-down direction and the front-rear direction X. As shown in FIG.

The first shielding plate 11 is positioned at the front end of the discharge port 2c and protrudes toward the rotating shaft 3 to restrict discharge of the water-containing material P to the discharge port 2c. It is configured to be movable between the unrestricted position H2 where the discharge of the object P is not restricted.
The first shielding plate 11 is connected to, for example, the lower end of a support member 12 provided through the upper surface of the casing 2, and a driving device (lifting device) 13 arranged above the casing 2 and at the upper end of the support member 12. It is configured to be movable in the vertical direction by. Also, the first shielding plate 11 may be configured by being divided into a plurality of pieces, each of which may be individually moved.

With such a configuration, it is possible to dry the water-containing material P, which becomes highly viscous within a predetermined water content range, to the discharge port 2c while drying it to a predetermined water content and discharging it. Furthermore, since the highly viscous water-containing substance P accumulates from the movable weir 10 on the upstream side (front side Xf) of the water-containing substance P in the conveying direction to form a weir, the water-containing substance P that does not have a predetermined water content is mixed. It is possible to suppress the discharge from the discharge port 2c. In addition, since the water content is high, even if the water content P contains a large amount of abrasive substances, the abrasion of the disk 4 of the drying device 1 can be suppressed, and the amount of dust generated during drying can also be suppressed. can be done.

The limit position H1 of the first shielding plate 11 is between the height Hb of the bottom surface of the casing 2 and the highest height Ht of the outer circumference of the rotary shaft 3 . In FIG. 5 , the limit position H1 is set between the height Ho of the axis O1 of the rotating shaft 3 and the highest height Ht of the outer periphery of the rotating shaft 3 . In other words, the first shielding plate 11 is provided so that its upper surface reaches the limit position H1 when raised to the highest position, as indicated by the solid line in FIG.
On the other hand, the unrestricted position H2 of the first shielding plate 11 is a position where discharge of the water-containing material P is not restricted, for example, the height Hb of the bottom surface of the casing 2 at the position where the first shielding plate 11 is arranged. In other words, the first shielding plate 11 is provided so that its upper surface reaches the non-limiting position H2 when lowered to the lowest position, as indicated by the two-dot chain line in FIG.
When the first shielding plate 11 is at the restricting position H1, only the amount of the water-containing material P overcoming the first shielding plate 11 is discharged from the outlet 2c. Conversely, when the first shielding plate 11 is in the non-restricting position H2, the water-containing material P is discharged without restriction.

By setting the range in which the first shielding plate 11 restricts the discharge of the water-containing material P from the height Hb of the bottom surface of the casing 2 to the highest height Ht of the outer circumference of the rotating shaft 3, the predetermined water content While restricting the discharge of water-containing substances P that are not water-containing substances, the accumulating water-containing substances P having a predetermined water content are scooped up by the disk 4 and discharged from a position higher than the rotating shaft 3 . Therefore, it is possible to prevent the water-containing material P whose discharge is restricted from accumulating and adhering to the first shielding plate 11 and clogging the first shielding plate 11 to such an extent that it cannot be discharged. Further, the first shielding plate 11 restricts only the water-containing material P and does not restrict the discharge of water evaporated from the water-containing material P, so that the drying efficiency does not drop.

As shown in FIGS. 2 and 6, the movable weir 10 of the drying apparatus 1 is provided on the side of the discharge port 2c, and protrudes from the side surface 2d of the casing 2 toward the rotating shaft 3 near the side surface 2d. further includes a discharge adjustment mechanism 14 capable of A plurality of discharge adjusting mechanisms 14 are arranged in the front-rear direction X on each of both side surfaces 2d of the casing 2, and are mechanisms for guiding the water-containing material P to the center of the discharge port 2c and adjusting the discharge of the water-containing material P. .

For example, as shown in FIGS. 2, 6 and 7, the discharge adjustment mechanism 14 includes a movable member 14a that protrudes from the side surface 2d of the casing 2 toward the rotation shaft 3, and one end of which is connected to the movable member 14a. It includes a support shaft 14b, a drive device 14c provided at the other end of the support shaft 14b, and an additional casing 14d in which a second shielding plate 15 and a movable member 14a, which will be described later, are accommodated.
The end surface of the movable member 14a on the rotating shaft 3 side is formed in a concave shape (for example, curved surface shape) along the outer peripheral shape of the rotating shaft 3, and protrudes most from the side surface 2d of the casing 2. Close enough to form a slight gap with the outer circumference. The upper surface of the movable member 14a is provided at a position higher than the highest height Ht of the outer periphery of the rotating shaft 3, for example. This allows the movable member 14a to guide the discharge of the water-containing material P that has climbed over the first shielding plate 11 .

The support shaft 14b is rotationally driven by the driving device 14c to project the movable member 14a from the side surface 2d toward the rotating shaft 3 side. Further, the support shaft 14b and the driving device 14c pull the movable member 14a into the additional casing 14d as indicated by the two-dot chain line in FIG. In FIG. 6, the movement of only one of the movable members 14a on both sides is indicated by a two-dot chain line, but the other movable member 14a can also move in the same manner.
An opening through which the movable member 14a can move is provided in a portion of the side surface 2d of the casing 2 on the side of the discharge port 2c. The additional casing 14d is, for example, a hollow hexahedron with one side open. The additional casing 14d is attached to the casing 2 with one open surface facing the outer surface of the casing 2, and communicates with the internal space of the casing 2 via this open surface. As a result, the movable member 14a can move between the inside of the additional casing 14d and the inside of the casing 2. As shown in FIG. In addition, the support shaft 14b penetrates the side surface facing the opening of the additional casing 14d, and the driving device 14c is provided at the end of the penetrating support shaft 14b (outside the additional casing 14d).

In this way, by providing the discharge adjustment mechanism 14 that can protrude and move from the side surface 2d of the casing 2 on the side of the discharge port 2c, the water-containing material P that is likely to reach the side surface 2d of the casing 2 can be moved to the center of the discharge port 2c. It is possible to prevent the highly viscous water-containing material P from adhering to and accumulating on the side surface 2d of the casing 2 by guiding it to the side.

As shown in FIGS. 2 and 5 , the movable weir 10 of the drying device 1 further comprises second shielding plates 15 arranged on both sides of the first shielding plate 11 . The second shielding plate 15 has an end on the rotating shaft 3 side formed in a concave shape along a part of the outer peripheral shape of the rotating shaft 3, and protrudes from the side surface 2d of the casing 2 toward the rotating shaft 3 to form a discharge port. It is movable between a second restriction position W1 that restricts the discharge of the water-containing material P to the discharge port 2c and a second non-restriction position W2 that does not restrict the discharge of the water-containing material P to the discharge port 2c.
The highest upper end surface of the second shielding plate 15, that is, the portion not along the outer shape of the first shielding plate 11 and the outer circumference of the rotating shaft 3 (the outer upper portion in the width direction W) is located above the limit position H1 of the first shielding plate 11. It may be a high position, for example, between the limit position H1 of the first shielding plate 11 and the highest height Hd of the outer periphery of the disc 4 . As a result, while the second shielding plate 15 is at the second restriction position W1, only the water-containing material P that has climbed over the first shielding plate 11 can be discharged from the outlet 2c.
For example, the second shielding plate 15 is connected to one end of the support member 16 provided through the side surface of the additional casing 14d on the rotating shaft 3 side, and arranged at the side of the additional casing 14d and the other end of the support member 16. It is configured to be movable in the width direction W by the driving device 17 that is mounted.

The second limit position W1 of the second shielding plate 15 is the position of the end face in the width direction W of the first shielding plate 11 . In other words, the second shielding plate 15 is provided so that the end surface on the central side is located at the second limit position W1 when projected to the farthest position from the side surface 2d, as indicated by the solid line in FIG.
On the other hand, the second unrestricted position W2 of the second shielding plate 15 is a position where discharge of the water-containing material P is not restricted, for example, the position of the opening in the side surface 2d of the casing 2 or the position inside the additional casing 14d. In other words, when the second shielding plate 15 is retracted to the farthest position from the rotating shaft 3, the central end face is positioned at the second non-limiting position W2, as indicated by the two-dot chain line in FIG. is provided as follows. In FIG. 5, the movement of only one of the two second shielding plates 15 is indicated by a two-dot chain line, but the other second shielding plate 15 can also move in the same manner.
When the second shielding plate 15 is at the second restricting position W1, only the amount of the water-containing material P overcoming the first shielding plate 11 is discharged from the outlet 2c. Conversely, when the second shielding plate 15 is in the second non-restricting position W2, the water-containing material P is also discharged from the sides of the first shielding plate 11 . As the second shielding plate 15 , the discharge adjustment mechanism 14 may be arranged on the side surface of the first shielding plate 11 to replace the second shielding plate 15 .

In this way, by further providing the second shielding plates 15 on both sides of the first shielding plate 11, even if the size of the discharge port 2c is limited by a frame or the like, the water-containing material can be prevented from the sides of the first shielding plate 11. Ejection of P can be restricted. Therefore, the water-containing material P having a predetermined water content can be properly discharged toward the discharge port 2c.

As shown in FIG. 1, the drying apparatus 1 includes a moisture content meter 21 arranged in the vicinity of the movable weir 10 to measure the moisture content of the hydrated material P, and an input amount or and a control device 20 for controlling the rotation speed of the rotating shaft 3 . The control device 20 is an electronic control device (computer) equipped with a processor, a timer, and a storage device (not shown). , the number of rotations of the rotating shaft 3, and the respective positions of the first shielding plate 11 and the second shielding plate 15 are controlled. A moisture content meter 21 is installed at the bottom of the casing 2 near the movable weir 10 and transmits the measured moisture content to the control device 20 .

Here, the properties of the charged hydrous material P will be described with reference to FIG. Although FIG. 11 is a cross-sectional view of a drying apparatus 1' of a second embodiment, which will be described later, the properties of the water-containing material P are the same as in the first embodiment. The properties of the water-containing material P in the casing 2' shown in FIG. , and has a water content of about 30%. The water-containing material P with a water content of about 60 to 70% becomes highly viscous, is scooped up by the disk 4, and is conveyed as large lumps and medium lumps. On the other hand, the water-containing substance P with a water content of 80% or more and the water-containing substance P with a water content of about 30% have high fluidity and do not form lumps, so they are not scraped up by the disk 4 and discharged.

The drying device 1 of the present invention utilizes the above properties of the water-containing material P to discharge the water-containing material P, which becomes highly viscous within a predetermined water content range, from the outlet 2c. Specific discharge methods are as follows.
First, in the initial stage, the first shielding plate 11 and the second shielding plate 15 are positioned close to each rotating shaft 3 so that the concave portions of the

respective shielding plates

11 and 15 are positioned substantially without gaps with respect to the lower portion of the rotating shaft 3. , the water-containing material P is introduced from the inlet 2b. The charged hydrous material P is in a fluid state with a moisture content of about 80%. The water-containing substance P is indirectly heated by the heating medium (steam) passing through the rotating shaft 3, the disc 4 and the casing 2 while being stirred by the rotating shaft 3 and the disc 4, and the water content near the first shielding plate 11 becomes The water-containing substance P with a low water-containing substance P begins to accumulate (initial stage after the water-containing substance P is added).

In the subsequent initial stage, the hydrous material P is continuously fed, and near the first shielding plate 11, the hydrous material P with a predetermined water content (60 to 70%) is scooped up by the disk 4 and deposited upward. go. Therefore, only the water-containing material P having a predetermined water content exceeds the first shielding plate 11 and is discharged from the discharge port 2c. The control device 20 moves the shielding

plates

11 and 15 away from the rotating shafts 3 while measuring the water content with the water content meter 21 so that the water-containing material P that does not reach a predetermined water content is not discharged. , the opening of the movable weir 10 is adjusted stepwise. Further, the water-containing material P, whose water content is gradually reduced by heating, accumulates in the casing 2 toward the upstream from the movable weir 10 to form a weir (initial stage of stabilization).

The opening degree of the movable weir 10 means a fully open state in which the first shielding plate 11 is retracted to the non-limiting position H2 and the second shielding plate 15 is retracted to the second non-limiting position W2. The remaining area obtained by subtracting the area blocked by the first shielding plate 11 and the second shielding plate 15 from the fully open area, with respect to the area (fully open area) viewed from the direction of the axis O1 in a state of being discharged without any restrictions. It is a ratio (%). The degree of opening of the movable weir 10 can also be expressed as the degree of opening of the gate. The larger the degree of opening of the gate, the easier the discharge of the water-containing substance P. The smaller the degree of opening of the gate, the more the discharge of the substance P is restricted.

For example, when discharging a water-containing material P with a water content of 60%, when the water content measured by the water content meter 21 becomes less than 70%, the shielding

plates

11 and 15 are moved to start adjusting the gate opening. do. The gate opening degree according to the water content can be adjusted, for example, as follows. By gradually increasing the opening of the gate as the water content approaches the predetermined water content, it is possible to prevent the water-containing material P that is deposited on the bottom and does not have the predetermined water content from being discharged.
Moisture content count value: 70%, gate opening: 0%
Moisture content count value: 69%, gate opening: 20%
Moisture content count value: 68%, gate opening: 40%
Moisture content count value: 66%, gate opening: 60%
Moisture content count value: 64%, gate opening: 80%
Moisture content count value: 62%, gate opening: 100%

During normal operation, when the controller 20 determines that the moisture content P near the first shielding plate 11 has reached a predetermined moisture content, the controller 20 moves the shielding

plates

11 and 15 to a position where discharge of the moisture P is not restricted. may be maintained open. As a result, the water-containing material P having a predetermined water content is discharged from the discharge port 2c. Further, when the water content changes, the control device 20 may move the movable weir 10 to limit the discharge of the water-containing material P.
In the stop stage of stopping the operation of the drying apparatus 1, the control device 20 keeps the movable weir 10 in an open state, stops the input of the water-containing material P and the supply of steam, and then moves the movable weir 10 to reduce the water content. After discharging the remaining water-containing material P from the discharge port 2c while adjusting, the movable weir 10 is closed.

The control device 20 uses the water content (water content count value) measured by the water content meter 21, but instead of or in addition to this, based on the retention time of the water-containing material P and the torque of the rotating shaft 3, etc. The water content of the water-containing material P may be determined (estimated).
The discharge adjusting mechanism 14 maintains a closed state in which the recessed portion of the movable member 14a is arranged at a position with substantially no gap with respect to the rotating shaft 3 while the water-containing material P is being charged, and the water-containing material P is discharged through the discharge port 2c. lead to By continuing to move the movable member 14a of the discharge adjustment mechanism 14 to one side and the other side in the width direction W, the water-containing material P placed on the movable member 14a may be dropped.

Further, each rotating shaft 3 may be rotated independently by the rotation driving device 8, and the water content of the hydrous material P may be adjusted by the rotation speed of each rotating shaft 3. For example, the rotation speed is differentiated so that the rotation speed of one rotation shaft 3A is higher than the rotation speed of the other rotation shaft 3B. By increasing the rotational speed of the side on which the water-containing material P is deposited, the drying efficiency of the water-containing material P can be increased. That is, by speeding up the rotation of the rotating shaft 3A, the feeding speed of the hydrous material P to the rotating shaft 3B side increases, and the stirring power can be increased. Furthermore, by providing a rotational speed difference between the pair of rotating shafts 3, the overlapping range of the surfaces of the discs 4 of the adjacent rotating shafts 3 changes, so that the surfaces of the discs 4 can be cleaned by the rubbing effect. can be done.

In this way, by controlling the input amount of the water-containing material P, the number of rotations of the rotating shaft 3, and the positions of the shielding

plates

11 and 15 according to the water content of the water-containing material P, a predetermined can be appropriately discharged from the discharge port 2c.

(Second embodiment)
A drying apparatus 1' according to a second embodiment of the present invention will now be described with reference to FIGS. 8 to 12. FIG. In addition, the same configuration as the first embodiment described above is given the reference numerals of the first embodiment, and the corresponding configurations are appended with a dash (') at the end of the reference numerals of the first embodiment. In this embodiment, the points of difference from the first embodiment will be mainly described, and the same parts will only be illustrated, and the description thereof will be omitted.

In the drying apparatus 1 of the first embodiment, the case where the two rotating shafts 3 are provided has been described as an example, but the number of rotating shafts 3 is not limited to two, and may be three or more.
As shown in FIGS. 8 to 12, the drying device 1' of this embodiment has four

rotary shafts

3A, 3B, 3C and 3D.
Of the four rotating shafts 3, two rotating

shafts

3A and 3B on one side in the width direction W of the casing 2' (the arrangement direction of the rotating shafts 3) rotate in the same direction when viewed from the direction of the axis O1. there is Further, the two

rotating shafts

3A and 3B rotate in a direction in which the upper portions thereof move toward the center side in the width direction W. As shown in FIG. In other words, the two

rotating shafts

3A and 3B rotate clockwise when viewed from the downstream side in the water-containing material P transport direction. A pair of adjacent

rotating shafts

3A and 3B is hereinafter referred to as a first rotating shaft set 31. As shown in FIG.

Of the four rotating shafts 3, the two

rotating shafts

3C and 3D on the other side in the width direction W rotate in the same direction when viewed from the direction of the axis O1. Also, the two

rotating shafts

3C and 3D rotate in a direction in which the upper portions thereof move toward the center side in the width direction W. As shown in FIG. In other words, the two

rotating shafts

3C and 3D rotate counterclockwise in a direction opposite to the rotating direction of the first rotating shaft set 31 when viewed from the downstream side in the water-containing material P conveying direction. A pair of adjacent rotating shafts 3</b>C and 3</b>D is hereinafter referred to as a second rotating shaft set 32 .

That is, of the four rotating shafts 3, the two

rotating shafts

3A and 3B on one side in the width direction W and the two

rotating shafts

3C and 3D on the other side in the width direction W rotate in opposite directions. do. The two

rotating shafts

3A, 3B on one side in the width direction W and the two

rotating shafts

3C, 3D on the other side in the width direction W rotate in such a direction that their upper portions approach each other. In this embodiment, the first rotating shaft set and the second rotating shaft set may be replaced with each other. That is, the plurality of discs arranged on a pair of adjacent rotating shafts of the same rotating shaft set have a wedge shape whose width becomes narrower toward the front in the rotating direction when viewed from the radial outer side, and the width in the width direction W The two

rotating shafts

3A and 3B on one side and the two

rotating shafts

3C and 3D on the other side in the width direction W may rotate their upper portions away from each other. By arranging the first rotating shaft assembly and the second rotating shaft assembly so as to replace each other in this manner, the water-containing material P is easily collected in the center of the casing 2, so that the water-containing material P is easily discharged from the discharge port 2c.

The disk 4A provided on the rotating shaft 3A of the first rotating shaft assembly 31 and the disk 4B provided on the rotating shaft 3B have a diameter when viewed from the direction of the axis O1 when the

rotating shafts

3A and 3B are rotating. are arranged so as to overlap each other in the direction.
Similarly, the disk 4C provided on the rotating shaft 3C of the second rotating shaft set 32 and the disk 4D provided on the rotating shaft 3D rotate from the direction of the axis O1 when the

rotating shafts

3C and 3D are rotating. They are arranged so as to overlap each other in the radial direction when viewed.

On the other hand, among the four rotating shafts 3, the

discs

4B and 4C provided on the two

rotating shafts

3B and 3C closer to the center in the width direction W are axially aligned when the

rotating shafts

3B and 3C are rotating. They are arranged so as not to overlap each other in the radial direction when viewed from the O1 direction. That is, a predetermined interval is provided between the rotation trajectory of the disc 4B and the rotation trajectory of the disc 4C.
That is, of the pair of

rotating shafts

3A and 3B of the first rotating shaft set 31, the disk 4B provided on the rotating shaft 3B adjacent to the second rotating shaft set 32 and the pair of rotating shafts of the second rotating shaft set 32 When viewed from the direction of the axis O1, the rotation trajectory of the disk 4 does not overlap with the disk 4C provided on the adjacent rotation shaft 3C of the first rotation shaft set 31 in 3C and 3D. In other words, the disk 4B does not pass between the stages of the disks 4C provided on the rotating shaft 3C, and the disk 4C does not pass between the stages of the disks 4B provided on the rotating shaft 3B.

According to this embodiment, by increasing the number of rotating shafts 3, the processing amount of the hydrous material P can be increased without increasing the size of the drying apparatus 1' in the vertical direction.
In addition, compared to the case where the rotating shaft 3 is all rotated in the same direction, the casing 2' is not filled with the hydrous material P unevenly and the drying efficiency is not lowered. ′ can prevent the inside from being blocked.

As in the first embodiment, the drying device 1' is arranged at the front end of the discharge port 2c, and the end portion on the rotating shaft 3 side is formed in a concave shape along a part of the outer peripheral shape of the rotating shaft 3. It has a movable weir 10' with a plate 11'. The first shielding plate 11' includes a space between the adjacent rotating shafts 3, a space below the rotating

shafts

3B and 3C near the center in the width direction W, and the outer

rotating shafts

3A and 3D in the width direction W. It is a plate-like member that closes the space near the center in the width direction W of the lower space with the front end side of the discharge port 2c.
However, since the drying apparatus 1' of this embodiment has four rotating shafts 3, as shown in FIG. 9, the first shielding plate 11' is provided with four concave portions. The two recesses near the center in the width direction W have a semi-arcuate shape when viewed from the direction of the axis O1, and the two recesses outside in the width direction W are obtained by cutting the upper two corners of the rectangle into a substantially arc shape. It has a missing shape.
Also, the first shielding plate 11' has its limit position H1, like the first shielding plate 11, between the height Hb of the bottom surface of the casing 2 and the highest height Ht of the outer periphery of the rotating shaft 3 (for example, In FIG. 9, the position is approximately the same as the height Ho of the axis O1).
The movable weir 10' is constructed in the same manner as the movable weir 10 of the first embodiment except that the shape of the first shielding plate 11' is different, and is movable in the same manner.
Therefore, the drying apparatus 1' of this embodiment can also obtain the same effects as those of the first embodiment.

The drying device 1' has the same discharge adjusting mechanism 14, second shielding plate 15, control device 20, and moisture content meter 21 as in the first embodiment. Similar to the first embodiment, it can be obtained.

Finally, a modified example of the second shielding plate 15 will be described with reference to FIG. Note that the configuration other than the second shielding plate 15 is the same as that of the drying apparatus 1' shown in FIG. 9, so the description is omitted.
The second shielding plate 15' shown in FIG. 12 expands upward the portion (outside upper portion in the width direction W) that does not follow the outer shape of the first shielding plate 11' and the outer periphery of the rotating shaft 3, and It is formed in a shape expanded in the width direction W so as to cover the upper part of the . Specifically, the highest upper end face of the second shielding plate 15' is provided at the same level as the highest height Hd of the outer circumference of the disc 4, and is positioned below the rotating

shafts

3A and 3D located outside in the width direction W. , and is provided so as to half surround the

rotation shafts

3A and 3D. As a result, only the water-containing material P that has climbed over the first shielding plate 11' can be reliably discharged from the discharge port 2c.

Reference Signs List 1, 1' drying device 2, 2' casing 2a trough 2b inlet 2c

outlet 2d side

3, 3A, 3B, 3C,

3D rotating shaft

4, 4A, 4B, 4C, 4D disc 4e side 4f opposite portion 5

flow path Openings

6, 6A, 6B First paddle portion 6f Surface facing forward in

rotational direction

7, 7A, 7B Second paddle portion 7f Surface facing forward in rotational direction 8 Rotation drive device 9 Jacket 10, 10' Movable weir 11, 11' One shielding plate 12 Supporting member 13 Driving device (elevating device)
14 discharge adjustment mechanism 14a movable member

14b support shaft

14c drive device 14d additional casing 15, 15' second shielding plate 16 drive device 17 support member 20 control device 21 moisture content meter 31 first rotary shaft assembly 32 second rotary shaft assembly Ht Highest height of outer periphery of rotating shaft Hd Highest height of outer periphery of disk Ho Height of axis line Hb Height of bottom surface H1 Limit position H2 Non-limit position O1 Axis line P Water content W Width direction W1 Second limit position W2 Second Two non-limiting positions X front-back direction Xf front side Xr rear side

Claims

a casing having an inlet at the front for charging a water-containing material;
a plurality of rotating shafts rotatably provided around an axis extending from the front portion to the rear portion of the casing;
a plurality of discs arranged at intervals on the outer peripheral surface of the rotating shaft and scooping up the water-containing material having a predetermined water content;
a discharge port provided on the bottom surface of the rear portion of the casing through which the water-containing material is discharged;
a movable weir disposed at the front end of the discharge port and having a first shielding plate whose end on the rotating shaft side is formed in a concave shape along a part of the outer peripheral shape of the rotating shaft;
The first shielding plate protrudes toward the rotating shaft and has a restricted position that restricts discharge of the water-containing material to the discharge port, and an unrestricted position that does not restrict discharge of the water-containing material within the discharge port. is movable between
The drying apparatus further comprises a discharge adjustment mechanism in which the movable weir is provided on the side of the discharge port and is capable of projecting and moving from the side surface of the casing toward the rotating shaft on the side closer to the side surface.
The drying apparatus according to claim 1, wherein the limiting position of the first shielding plate is between the height of the bottom surface of the casing and the highest height of the outer periphery of the rotating shaft.
The movable weir further comprises second shielding plates arranged on both sides of the first shielding plate,
The second shielding plate has an end portion on the side of the rotating shaft formed in a concave shape along a part of the outer peripheral shape of the rotating shaft, and protrudes from the side surface toward the rotating shaft to the discharge port. 3. The drying apparatus according to claim 2, wherein the drying apparatus is movable between a second restricted position that restricts the discharge of the water content and a second non-restriction position that does not restrict the discharge of the water content.
a moisture content meter arranged near the movable weir for measuring the moisture content of the water-containing material;
a control device for controlling the amount of the water-containing substance to be introduced into the inlet or the rotation speed of the rotating shaft;
4. According to the moisture content measured by the moisture content meter, the control device controls the input amount, the rotation speed, and each position of the first shielding plate and the second shielding plate according to the moisture content measured by the moisture content meter. Drying equipment as described.
a first set of rotating shafts that are a pair of adjacent rotating shafts and rotate in the same direction;
a pair of adjacent rotating shafts, wherein the rotating shafts rotate in the same direction and in a direction opposite to that of the first rotating shaft set;
the disk provided on the rotating shaft adjacent to the second rotating shaft set among the pair of rotating shafts of the first rotating shaft set;
Among the pair of rotating shafts of the second rotating shaft set, the discs provided on the rotating shafts adjacent to the first rotating shaft set do not overlap the rotation trajectories of the discs when viewed from the axial direction. 5. A drying apparatus according to any one of claims 1 to 4, arranged in such a way as to.