WO2014041869A1

WO2014041869A1 - Indirect heating-type rotary drier

Info

Publication number: WO2014041869A1
Application number: PCT/JP2013/067489
Authority: WO
Inventors: 片岡　正樹; 隆行野口
Original assignee: 月島機械株式会社
Priority date: 2012-09-11
Filing date: 2013-06-26
Publication date: 2014-03-20
Also published as: IN2015DN01705A; CN104603565A; CN104603565B; JP2014055687A; JP6059473B2

Abstract

This indirect heating-type rotary drier (A) is provided with: a main drier unit (11) for rotating and drying a work material (W) supplied from one end of the main drier unit (11) while the work material (W) is transported to the other end; a plurality of heating tubes (18) arranged in a row on the inner peripheral part of the main drier unit (11), the heating tubes (18) extending in the direction of the center axial line (O) of the main drier unit (11); and a plurality of tube supports (22) for supporting the plurality of heating tubes (18). A plurality of first tube supports (23), which constitute part of the plurality of tube supports (22) and are positioned at the other end of the main drier unit (11), are arranged so that the first tube supports (23) closer to the other end of the main drier unit (11) are oriented further in the direction of rotation (T) of the main drier unit (11).

Description

Indirect heating type rotary dryer

The present invention relates to an indirect heating rotary dryer.
This application claims priority based on Japanese Patent Application No. 2012-199342 for which it applied to Japan on September 11, 2012, and uses the content here.

For example, an indirect heating type rotary dryer has been conventionally used to dry a processed material or a large amount of processed material whose volume and angle of repose change greatly before and after drying, such as coal. Such an indirect heating type rotary dryer includes a cylindrical dryer body that is rotatable about a central axis extending laterally so as to slightly move downward from one end to the other end. An apparatus is known in which a plurality of heating tubes extending in the central axis direction are arranged in the circumferential direction on the inner peripheral portion of the main body. The heating tube is supported by a tube support protruding from the inner peripheral surface of the dryer body. In such an indirect heating type rotary dryer, the processed material supplied from one end side of the dryer main body is dried and discharged while being fed to the other end side while rotating the dryer main body.

For example, in Patent Document 1 below, in such an indirect heating type rotary dryer, stress concentration occurs in the root portion of the tube support due to the rotation of the dryer body, its own weight, and deformation due to the action of heat from the heating tube. Techniques for preventing breakage have been proposed. Specifically, it has been proposed to provide a reinforcing ring over the entire inner peripheral surface of the dryer main body so as to pass through the tube support attachment position or the vicinity thereof. Further, in Patent Document 2 below, in particular, when the tube support is an annular support plate that is annularly continuous on the inner peripheral surface of the dryer main body, the processed material stays on one end side (upstream side) of the tube support and is excessive. In order to prevent the tube from being dried, it has been proposed to provide a passage hole in the tube support through which the processed material passes.

Japanese Unexamined Patent Publication No. 2006-57880 Japanese Unexamined Patent Publication No. 2001-355965

When drying coal for thermal power plants, coal for coke ovens, etc. using such an indirect heating type rotary dryer, the amount of processing increases, especially for coal with high water content such as brown coal, There is a possibility that the transportability of the processed product in the supply section on one end side of the steel sheet may be impaired. For this reason, in order to ensure sufficient transportability for a large amount of processed products, the rotational speed of the dryer body is increased, or the downward inclination of the dryer body from one end to the other end is increased. There is a case.

However, if the rotational speed of the dryer body is increased, the required power increases and the operating cost may increase.
On the other hand, when the inclination of the dryer body is increased, the thrust load in the central axis direction increases, and the burden on the support roller that rotatably supports the dryer body also increases, so a large support roller having high load resistance performance Necessary. Furthermore, when the inclination of the dryer main body is increased, the height of the processing product supply unit is increased. For this reason, it is necessary to supply the processed material from a higher position, which may increase the labor of supply and increase the cost.

In addition, for example, when drying a processed material such as coal with a volume or repose angle greatly different between before drying and after drying by an indirect heating type rotary dryer, one end of a dryer main body serving as a processed product supply unit On the side, the filling rate of the processed product is large, and on the other end side serving as the discharge portion, the filling rate is small. In the indirect heating type rotary dryer, it is preferable that the filling rate is uniformly about 30% over the entire length in the central axis direction. However, when the filling rate in the supply unit becomes larger than this filling rate, the processed product is not sufficiently stirred, and the drying efficiency may be reduced. In addition, when the filling rate in the discharge portion is smaller than the preferred filling rate, the contact area between the processed product and the heating tube is lowered, and in this case, the drying efficiency may be lowered.

When a reinforcing ring or an annular support plate extending over the entire inner peripheral surface of the dryer main body as described in Patent Documents 1 and 2 is provided on the other end side of the dryer main body, for example, The filling rate of the processed material on the end side can be increased to some extent. However, in this structure, it becomes easy to dam the processed material, and therefore it is not possible to provide a ring or a support plate having an excessively large protrusion height from the inner peripheral surface, and there is a limit to increasing the filling rate. In addition, the transport of processed products having a relatively large particle size is hindered by the ring or the support plate, and the processed material having such a large particle size has a small contact area with the heating tube, so that the drying efficiency can also be lowered. There is sex.

The present invention has been made under such a background, and it is possible to increase the filling rate of the processed material on the other end side of the dryer main body serving as the discharged portion of the processed material, as in the case of drying coal. An object of the present invention is to provide an indirect heating type rotary dryer capable of obtaining a relatively uniform filling rate in the entire dryer body even when the amount of processing increases.

In order to achieve the above-mentioned object, the indirect heating type rotary dryer of the present invention is formed in a cylindrical shape that is rotatable around a central axis extending in a lateral direction, and a processed product supplied from one end side thereof while rotating. A dryer main body that is dried while being conveyed to the other end side, a plurality of heating tubes that are arranged in a circumferential direction on the inner peripheral portion of the dryer main body and extend in the central axis direction, and an inner periphery of the dryer main body A plurality of tube supports that protrude from the surface and support the plurality of heating tubes. The plurality of tube supports are disposed at intervals at a plurality of locations in the central axis direction for each of the at least one heating tube, and the tube supports adjacent in the circumferential direction are also spaced apart in the central axis direction. It is arranged with a gap. Among the plurality of tube supports, a plurality of first tube supports positioned on the other end side of the dryer main body are arranged so as to face the rotation direction of the dryer main body toward the other end side of the dryer main body. Has been.

In the indirectly heated rotary dryer configured as described above, the processed product supplied from one end side of the dryer main body is conveyed from the inner peripheral surface of the dryer main body while being conveyed to the other end side with the rotation of the dryer main body. It is dried in contact with a plurality of heating tubes supported by a plurality of protruding tube supports. Since the plurality of tube supports that are adjacent to each other in the circumferential direction of the dryer main body are spaced apart in the central axis direction, it is possible to prevent the processed material being conveyed from being dammed up. Further, on the other end side of the dryer main body, among the plurality of tube supports, a plurality of first tube supports spiral toward the other end of the dryer main body toward the rotation direction of the dryer main body. It is arranged. For this reason, the processed product is subjected to a force to be pushed back to one end side by the spiral formed by the arrangement of the first tube supports while being conveyed to the other end side.

Therefore, on the other end portion side of the dryer main body, the force to push back to the one end side acts on the processing object, so that the conveyance speed of the processing object is reduced and the filling rate on the other end side is increased. It is possible to improve the drying efficiency by bringing the treated product into sufficient contact with the heating tube. That is, according to the indirect heating type rotary dryer having the above-described configuration, it is possible to promote the uniform filling rate of the entire dryer body, and the volume and the angle of repose are greatly different before and after drying like coal. Even when a large amount of processed material such as lignite is processed in particular, an efficient drying process can be performed.

In addition, the tube support normally has a plate shape in which a through hole through which one or a plurality of the heating tubes are inserted is formed as described in Patent Document 2, for example. Among such tube supports, the first tube support on the other end side of the dryer main body is inclined toward the rotation direction as it goes toward the other end side of the dryer body on the side facing the rotation direction of the first tube support. One inclined portion may be provided. According to this configuration, in addition to the spiral arrangement of the first tube support, a force to push back to the one end side can be applied to the processed object by the first inclined portion of the first tube support itself. Therefore, it is possible to further increase the filling rate on the other end side.

In addition, the tube support may be arranged in a general zigzag pattern in a portion other than the other end side that serves as a discharge portion of the processed product from the dryer main body. However, among the plurality of tube supports, the plurality of second tube supports on one end side of the dryer main body are set on the side opposite to the rotation direction as going to the other end side of the dryer main body, opposite to the first tube support. You may arrange so that it may face. According to this configuration, the processing object receives a force that is pushed out to the other end side by the spiral formed by the arrangement of the second tube supports. For this reason, without increasing the rotational speed of the dryer body or increasing the inclination, it is possible to increase the conveyance speed on one end side to be the supply part of the processed product and reduce the filling rate on one end side, It becomes possible to make the filling rate of the processed product as a whole of the dryer main body more uniform.

In addition, you may provide a 2nd inclination part in the side part which faces the said rotation direction of the 2nd tube support in the one end side of a dryer main body. This 2nd inclination part inclines so that it may go to the opposite side to a rotation direction as it goes to the other end side of a dryer main body contrary to the 1st inclination part of the other end side. According to this structure, the conveyance speed of the processed material at the one end side can be increased, and the filling rate at the one end side can be reduced. When the second inclined portion is provided, the plurality of second tube supports on one end side may be arranged in a spiral shape as described above, or may be a general staggered arrangement. .

As described above, according to the present invention, it is possible to increase the filling rate on the other end side of the dryer main body serving as the discharge portion of the processed material and improve the drying efficiency. Moreover, the filling rate as the whole dryer main body can be made uniform, and even when a large amount of processed material such as coal is processed, it is possible to efficiently perform the drying process.

It is a perspective view which shows the indirect heating type rotary dryer in the 1st Embodiment of this invention. It is a front view which shows the tube support in 1st Embodiment. FIG. 2B is a view taken along line AA in FIG. 2A. It is an expanded view of the dryer main body which shows the arrangement | sequence of the tube support in 1st Embodiment. It is an expanded view of the dryer main body which shows the arrangement | sequence of the tube support in the 2nd Embodiment of this invention. It is a front view which shows the tube support in 2nd Embodiment. FIG. 5B is a view taken along line BB in FIG. 5A. It is an expanded view of the dryer main body which shows the arrangement | sequence of the tube support in the comparative example with respect to the Example of this invention.

A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the indirect heating rotary dryer A of the present embodiment has a dryer main body 11 formed in a long cylindrical shape with a central axis O as a center. Two rings 12 having an annular shape centering on the central axis O are provided on both ends of the outer periphery so as to protrude outward, and one end side in the central axis O direction between these rings 12 (in FIG. 1) An annular gear 13 centered on the central axis O is provided on the outer periphery on the left back side.

In such a dryer main body 11, the rings 12 are respectively placed on a pair of rollers 14 and supported so as to be rotatable around the central axis O. The dryer main body 11 is placed horizontally with its central axis O inclined slightly toward the other end side (right front side in FIG. 1) from one end side to the other end side of the dryer main body 11. Yes. Further, the gear 13 is meshed with the gear 15A of the rotational driving means 15 such as an electric motor, and the dryer main body 11 is directed around the central axis O in a certain rotational direction T (see FIG. 3) by the rotation of the rotational driving means 15. Can be rotated.

In addition, an end plate (not shown) having an annular plate shape is provided at the opening on one end side of the dryer main body 11, and the processed product W is provided in the dryer main body 11 at the opening at the center of the end plate. A screw feeder 16 is inserted along the central axis O from one end side.
The screw feeder 16 is centered on a screw shaft 16C in which a spiral screw blade 16B is disposed on the outer periphery in a cylindrical casing 16A inserted coaxially with the central axis O into the central opening of the end plate. A configuration inserted along the axis O is provided. When the screw shaft 16C is rotated by a rotation driving means 16D such as an electric motor, the processed product W supplied to the supply port 16E at the upper part of the casing 16A protruding from one end of the dryer main body 11 is sent out, and the dryer main body. 11. Therefore, one end of the dryer main body 11 is a supply unit for the processed product W.

In addition, the carrier gas G for discharging | emitting with the vapor | steam evaporated from the processed material W dried in the dryer main body 11 from the supply port 16E of the screw feeder 16 is also supplied (suction). In addition, a gap between the central opening of the end plate and the casing 16A of the screw feeder 16 is sealed in a state in which the end plate rotating integrally with the dryer main body 11 is allowed to rotate.

A box-shaped outlet chamber 17 is disposed at the other end of the dryer body 11 so as to cover the outer periphery of the other end of the dryer body 11. The other end of the dryer main body 11 is sealed in a state in which the rotation is allowed and passes through the outlet chamber 17. In addition, a plurality of discharge chutes 11A are opened in the dryer main body 11 in the outlet chamber 17, an exhaust port 17A for the carrier gas G is formed in the upper portion of the outlet chamber 17, and a dried processed product W is formed in the lower portion. A discharge port 17B is provided. Therefore, the other end portion of the dryer main body 11 serves as a discharge portion for the dried processed product W, and the direction from the one end portion serving as the supply portion toward the other end portion serving as the discharge portion is the amount of the processed product W. The transport direction is F (see FIG. 3).

A plurality of (many) heating tubes 18 extending in the direction of the central axis O are disposed on the inner peripheral portion of the dryer main body 11 at intervals from the inner peripheral surface. These heating tubes 18 extend parallel to the central axis O, and are dried concentrically so as to form a plurality of rows in a radial direction perpendicular to the central axis O and a circumferential direction centered on the central axis O. It is disposed over the entire circumference of the machine body 11. Further, the other end portions of these heating pipes 18 are connected to a manifold 19 that is rotatably provided integrally with the other end portion of the dryer main body 11 that passes through the outlet chamber 17. A supply pipe 19A for a heating medium such as steam is connected to the center of the manifold 19.

On the other hand, one end of these heating tubes 18 penetrates the end plate and protrudes from one end of the dryer main body 11, and the end portion of the end plate through which the heating tube 18 passes is sealed. Further, a header pipe 20 for discharging the air remaining in the heating pipe 18 is attached to the outer periphery of one end portion of the dryer main body 11 so as to be annularly attached around the central axis O. The header tube 20 and one end of each heating tube 18 protruding from the end plate are connected to each other via a connecting tube 21.

Such a heating tube 18 is supported and attached in the dryer main body 11 by a tube support 22 as shown in FIG. 3 provided so as to protrude radially inward from the inner peripheral surface of the dryer main body 11. . The tube support 22 of the present embodiment is a plate-like member having a sector shape as shown in FIG. 2A when viewed from the central axis O direction. The plate-like tube support 22 is perpendicular to the central axis O direction, and the side surface forming a long fan-shaped arc (radially outer arc) is attached to the inner peripheral surface of the dryer body 11 by welding or the like. .
That is, the indirectly heated rotary dryer A of the present embodiment is formed in a cylindrical shape that can be rotated around a central axis O that extends in the lateral direction, and the processed product W that is supplied from one end side while rotating is supplied to the other. A dryer main body 11 that is dried while being conveyed to the end side, a plurality of heating tubes 18 that are arranged side by side in the circumferential direction on the inner peripheral portion of the dryer main body 11 and extend in the central axis O direction, and the inside of the dryer main body 11 And a plurality of tube supports 22 provided so as to protrude from the peripheral surface and supporting the plurality of heating tubes 18.

The tube support 22 is formed with a through hole 22A having a circular cross section through which the heating tube 18 is inserted and joined so as to penetrate the plate-like tube support 22 in the thickness direction. In the present embodiment, as described above, a plurality of heating tubes 18 that are arranged in a plurality of rows in the radial direction and the circumferential direction can be supported by a single tube support 22. The through holes 22A (six in FIG. 2A) are formed so as to be aligned in the radial direction and the circumferential direction with respect to the central axis O. The tube support 22 may support the heating tubes 18 one by one. In this case, only one through hole 22A is formed in the tube support 22.

In such a tube support 22, a plurality of tube supports 22 are attached to the inner peripheral surface of the dryer main body 11 with a large interval of, for example, about several meters in the central axis O direction for each supported heating tube 18. The tube supports 22 that are adjacent to each other in the circumferential direction are also attached to each other with a gap smaller than the above interval in the direction of the central axis O. FIG. 3 is a development view showing the arrangement of the plurality of tube supports 22 when the inner peripheral surface of the dryer body 11 is developed. As shown in FIG. 3, in the first embodiment, the tube support 22 having the small gap on one end side (left side in FIG. 3) of the dryer main body 11 serving as a supply unit is adjacent to the circumferential direction. Are alternately arranged in a zigzag manner on one end side and the other end side in the central axis O direction, and such tube supports 22 are arranged in two rows with the above-mentioned large intervals.

With respect to the tube support 22 on one end side, the tube support 22 on the other end side (right side in FIG. 3) serving as a discharge portion for the processed product W opens the small gap adjacent in the circumferential direction. The tube support 22 is arranged so as to go in the rotation direction T of the dryer main body 11 as it goes to the other end, that is, as it goes to the conveyance direction F of the processed product W. In addition, the some tube support 22 located in the other end side of the dryer main body 11 may be called the some 1st tube support 23 hereafter. That is, the first tube support 23 is arranged so as to face the rotation direction T of the dryer main body 11 as it goes to the other end side of the dryer main body 11. In other words, the first tube support 23 is arranged in a spiral on the inner peripheral surface of the cylindrical dryer body 11. In this embodiment, the spiral lead (interval between adjacent spiral rows in the direction of the central axis O) formed by the row of the first tube supports 23 on the other end side is constant, and the plurality of heating portions of the above-mentioned part The tube 18 is supported by a plurality of first tube supports 23 for each lead.

Further, the plate-like first tube supports 23 thus arranged in a spiral shape have a triangular columnar cross section (cross section in the circumferential direction) as shown in FIG. 2B on the side facing the rotation direction T. An inclined member 23B is joined and attached by welding or the like. As a result, the side portion is connected to the side surface facing the one end side of the dryer body 11 over the entire thickness direction of the first tube support 23 and the radial direction with respect to the central axis O, and toward the other end ( A first inclined portion 23C that is inclined so as to be directed in the rotation direction T is provided (see reference F in FIG. 2B). The tube support 22 arranged in a staggered manner on one end side of the dryer main body 11 is not provided with such a first inclined portion 23C, and the side portion facing the rotation direction T is a plane parallel to the central axis O. It is made into a shape.

In the indirect heating type rotary dryer A configured as described above, the processed material W such as coal is input from the supply port 16E of the screw feeder 16 on one end side of the dryer main body 11 as described above, and enters the dryer main body 11. The dryer body 11 is fed to the other end side by the rotation and inclination of the dryer body 11 and conveyed. The processed product W comes into contact with the heating tube 18 while being conveyed, and is indirectly heated by a heating medium such as steam flowing in the heating tube 18 to be dried. The processed product W thus dried is discharged from a discharge chute 11A opened at a plurality of locations at the other end of the dryer main body 11 through a discharge port 17B located at a lower portion of the outlet chamber 17. Further, water vapor or the like generated from the processed product W by drying is exhausted from the exhaust port 17A together with the carrier gas G.

When the processed product W is conveyed to the other end side of the dryer main body 11, the processed product W also contacts a plurality of tube supports 22 that support the heating tube 18. Of the plurality of tube supports 22, the first tube support 23 on the other end side serving as the discharge portion of the dryer body 11 is arranged in a spiral shape so as to go in the rotation direction T toward the other end of the dryer body 11. It is installed. For this reason, the processed material W which contacted the 1st tube support 23 located in the side which goes to the rotation direction T among a pair of 1st tube support 23 adjacent to the circumferential direction is the rotation direction T back by rotation of the dryer main body 11. FIG. When contacting the first tube support 23 on the side, a force to push back to the one end side of the dryer main body 11 acts on the workpiece W.

The first tube supports 23 adjacent to each other in the circumferential direction are spaced apart from each other in the direction of the central axis O, and radially inward of the first tube support 23 (tube support 22) (the central portion of the dryer main body 11). Therefore, it is possible to prevent all of the workpiece W from being pushed back to one end side or blocked. Therefore, while the workpiece W is conveyed to the other end side as a whole, the conveyance speed is suppressed to be smaller than that of the one end side. Therefore, even when a large amount of the processed material W such as coal whose volume and angle of repose become extremely small after drying, the filling rate of the processed material W is increased on the other end side of the dryer main body 11 serving as a discharge unit. Uniformity with the one end side can be achieved. For this reason, it is possible to improve the drying efficiency by bringing the processed product W and the heating pipe 18 into contact with each other for a long time, and it is possible to promote a sufficient drying process even for the processed product W having a high water content such as brown coal. It becomes.

In the present embodiment, in the first tube support 23 arranged in a spiral shape on the other end side of the dryer main body 11, an inclined member 23 </ b> B is attached to a side portion facing the rotation direction T of the dryer main body 11. A first inclined portion 23 </ b> C that is inclined so as to be directed in the rotation direction T toward the other end is provided. For this reason, also in each 1st tube support 23, the force which pushes back to the one end side of the dryer main body 11 can be made to act on the processed material W by contacting this 1st inclination part 23C. For this reason, according to this embodiment, the filling rate in the other end side of the dryer main body 11 can further be increased, and the dryer main body 11 as a whole can be made more uniform, and the drying efficiency can be further improved.

Note that the first inclined portion 23C may not be provided as long as the filling rate can be sufficiently increased only by the spiral arrangement of the first tube support 23 on the other end side of the dryer main body 11. In this embodiment, as described above, the inclined member 23B is attached to the side portion of the first tube support 23 on the other end side of the dryer body 11, and the diameter of the first tube support 23 with respect to the thickness direction and the central axis O is set. Although the first inclined portion 23C is provided over the entire direction, if the first inclined portion 23C is provided, the inclined member 23B is thin even if it is thicker than the plate thickness of the first tube support 23. It may also be provided in a part of the radial direction with respect to the central axis O. Further, instead of attaching the inclined member 23B in this way, the first inclined portion 23C may be formed on the side portion of the first tube support 23 facing the rotation direction T by cutting or the like.

On the other hand, in the first embodiment, the tube support 22 on one end side serving as the supply unit of the dryer main body 11 has the tube support 22 with the small gap in the direction of the central axis O as shown in FIG. And the other end side are alternately arranged in a staggered pattern. In this supply section, the processed product W is in a wet state, and particularly in the case of coal, the volume and the angle of repose are large, the transportability is poor, and the filling rate may increase. Therefore, in order to suppress the filling rate at one end of the dryer main body 11, it is necessary to increase the rotational speed of the dryer main body 11 or increase the inclination as described above. However, in any case, the operating cost increases. In addition, on the other end side of the dryer main body 11, the filling rate may be low, and the above-described effects of the present invention may be impaired.

The second embodiment of the present invention for suppressing the filling rate on one end side serving as the supply unit without lowering the filling rate on the other end side of the dryer main body 11 serving as the discharge unit is denoted by the same reference numerals as in FIG. This will be described with reference to FIGS. FIG. 4 is a development view showing the arrangement of the plurality of tube supports 22 when the inner peripheral surface of the dryer main body 11 is developed in the second embodiment. As shown in FIG. 4, the arrangement of the tube supports 22 (first tube supports 23) on the other end side is a spiral shape toward the rotation direction T toward the other end as in the first embodiment. On the other hand, the plurality of tube supports 22 on one end side are arranged in a spiral shape toward the opposite side to the rotation direction T toward the other end opposite to the first tube support 23. Hereinafter, the plurality of tube supports 22 positioned on one end side of the dryer body 11 may be referred to as a plurality of second tube supports 24 hereinafter. That is, the 2nd tube support 24 is arranged so that it may go to the opposite side to the rotation direction T of the dryer main body 11 as it goes to the other end side of the dryer main body 11. As shown in FIG. In addition, in this 2nd Embodiment, the tube support 22 of the dryer main body 11 center part in the center axis line O direction between one end side and the other end side is the tube support 22 of the one end side of 1st Embodiment. It is also arranged in a staggered pattern.

Therefore, according to the indirect heating type rotary dryer of the second embodiment, the filling rate of the processed product W can be increased on the other end side of the dryer body 11 as in the first embodiment. On the other hand, on the one end side, contrary to the other end side, the processed product W that has contacted the second tube support 24 is subjected to a force that is pushed out to the other end side, that is, the conveyance direction F side. That is, the processed product W in a wet state with poor transportability can be prevented from staying at one end side of the dryer main body 11, and the processed product W can be transported quickly, and the filling rate on one end side can be suppressed. It becomes. For this reason, the filling rate of the processed product W can be made uniform over the entire direction of the central axis O of the dryer main body 11, and the processed product W can be uniformly contacted with the heating tube 18 to be more efficient. It is possible to perform a drying process.

In addition, the tube support 22 (second tube support 24) on one end side of the dryer main body 11 in the second embodiment is the circumferential direction of the dryer main body 11 in the same manner as the tube support 22 on one end side of the first embodiment. Both side surfaces may be parallel to the central axis O, that is, perpendicular to a fan-shaped surface (plate surface) facing in the direction of the central axis O. However, for example, as shown in FIGS. 5A and 5B, on the side facing the rotation direction T, the dryer body 11 is opposite to the first inclined portion 23 </ b> C of the first tube support 23 on the other end side of the first embodiment. You may provide the 2nd inclination part 24C which inclines so that it may go to the opposite side to the rotation direction T as it goes to the other end side. The second inclined portion 24C may be formed by joining the inclined member 24B to the side portion of the tube support 22 on one end side, or by performing cutting or the like on the side portion of the tube support 22 on one end side. May be. By providing such a second inclined portion 24C, a larger pushing force can be applied to the processed product W supplied to one end side of the dryer body 11, and the filling rate can be further reduced.

However, such a second inclined portion 24 </ b> C is directed to the side opposite to the rotational direction T as the plurality of second tube supports 24 on one end side is directed to the other end of the dryer body 11 as in the second embodiment. Thus, the present invention can be applied even if it is not arranged in a spiral. That is, in the first embodiment, the tube support 22 on one end side of the dryer main body 11 arranged in a staggered manner is inclined to the opposite side of the rotational direction T toward the other end side, and the second inclined portion 24C. May be provided.

Hereinafter, the effects of the present invention will be described with reference to examples. In this embodiment, in an indirect heating type rotary dryer having a dryer body 11 having an inner diameter of 965 mm and a length of 8000 mm, a dryer in which a plurality of tube supports 22 are arranged based on the development shown in FIG. A dryer having a plurality of tube supports 22 arranged on the basis of the development shown in FIG. These are sequentially referred to as Examples 1 and 2. In Examples 1 and 2, the inclined portions (the first inclined portion 23C and the second inclined portion 24C) are not provided in any of the tube supports 22 on the one end side and the other end side. Therefore, in order to confirm the effect of the inclined portion, the tube support 22 (first tube support 23) on the other end side of the dryer in which the plurality of tube supports 22 are arranged based on the development view shown in FIG. The first inclined portion 23C described in the first embodiment is provided, and the second inclined portion 24C described in the second embodiment is provided on the tube support 22 (second tube support 24) on one end side. This is Example 3.

Further, as a comparative example with respect to Examples 1 to 3, a dryer in which tube supports having no inclined portion are arranged on the dryer body 11 having the same size as that of Examples 1 to 3 based on the development view shown in FIG. Also manufactured. That is, in the indirect heating type rotary dryer of this comparative example, four rows of tube supports arranged in a staggered pattern are provided at large intervals in the direction of the central axis O of the dryer body 11. In FIG. 6 as well, elements common to FIGS. 3 and 4 are denoted by the same reference numerals. Other specifications are the same in Examples 1 to 3 and the comparative example.

Using these indirectly heated rotary dryers of Examples 1 to 3 and the comparative example, a coal having an average particle size of 1 mm and a moisture content of 35 mass% is supplied and dried under the condition of drying until the moisture content reaches 25 mass%. Went. Using the inspection windows (three in total) formed at positions of every 2000 mm from one end to the other end of the dryer body 11, the filling height of the processed product W in the drying treatment is measured, and the filling rate Was calculated. As a result, the filling rate in the comparative example was 35%, 25%, and 12% in order from one end side. On the other hand, 36%, 30%, and 28% in Example 1, 32%, 30%, and 28% in Example 2, and 30%, 30%, and 30% in Example 3, and Examples 1 to 3 It was confirmed that the filling rate was made uniform in this order.

The present invention can be applied to an indirect heating rotary dryer that dries a processed product.

DESCRIPTION OF SYMBOLS 11 Dryer main body 15 Rotation drive means 16 Screw feeder 17 Outlet chamber 18 Heating tube 22 Tube support 23 1st tube support 24 2nd tube support 23C 1st inclination part 24C 2nd inclination part A Indirect heating type rotary dryer W Processed material O Central axis T of the dryer body 11 Rotation direction of the dryer body 11 F Transport direction of the workpiece W

Claims

A dryer main body that is formed in a cylindrical shape that is rotatable around a central axis that extends in the lateral direction, and that is rotated while being conveyed while being conveyed to the other end while being rotated.
A plurality of heating tubes arranged in the circumferential direction on the inner periphery of the dryer main body and extending in the central axis direction;
A plurality of tube supports provided to protrude from the inner peripheral surface of the dryer main body and supporting the plurality of heating tubes, and an indirect heating type rotary dryer,
The plurality of tube supports are disposed at intervals at a plurality of locations in the central axis direction for each of the at least one heating tube, and the tube supports adjacent in the circumferential direction are also spaced apart in the central axis direction. Arranged with a gap,
Among the plurality of tube supports, the plurality of first tube supports positioned on the other end side of the dryer body are arranged so as to be directed in the rotation direction of the dryer body as going to the other end side of the dryer body. Indirect heating type rotary dryer.
The side part which faces the said rotation direction of the said 1st tube support is provided with the 1st inclination part inclined so that it might go to the said rotation direction as it goes to the other end side of the said dryer main body. Indirect heating type rotary dryer.
Among the plurality of tube supports, a plurality of second tube supports positioned on one end side of the dryer main body are arranged so as to face the opposite side of the rotation direction toward the other end of the dryer main body. The indirect heating rotary dryer according to claim 1.
Among the plurality of tube supports, a plurality of second tube supports positioned on one end side of the dryer main body are arranged so as to face the opposite side of the rotation direction toward the other end of the dryer main body. The indirect heating type rotary dryer according to claim 2.
Among the plurality of tube supports, a side portion of the plurality of second tube supports positioned on one end side of the dryer body that faces the rotation direction has the rotation direction as it goes to the other end side of the dryer body. The indirect heating type rotary dryer as described in any one of Claims 1-4 in which the 2nd inclination part inclined so that it may go to an other side is provided.