JP2014202434A - Indirect heating type drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indirect heating type drying device capable of obtaining adequate drying degree without increasing trough volume and capable of preventing that movement of matter to be processed stagnates to cause blockage.SOLUTION: An indirect heating type drying device in which matter P to be processed is agitated by a plurality of blades 6 arranged leaving intervals in the axial direction with respect to a rotation shaft, is conveyed and, at the same time, is heated and dried is characterized in that the blades 6 adjacent to each other in the axial direction have opposition parts 10 opposite to each other in the axial direction O1, are arranged such that mutual phases are shifted in the circumferential direction of the rotation shaft and a paddle part 11 extended toward the mutual opposition part 10 of the blade 6 adjacent to each other is provided on the opposition part 10.

Description

  The present invention relates to an indirect heating type drying apparatus that heats and dries an object to be treated such as waste in a predetermined conveying direction.

Since various materials such as various biomass and waste (sludge) contain a large amount of moisture, drying treatment by heating may be performed using a drying device.
As a drying device, for example, a casing having a substantially U-shaped cross section, two hollow shafts rotating in opposite directions inside the casing, and fan-shaped hollow blades arranged on the outer periphery of the hollow shaft are provided. Indirect heating type drying apparatuses are known.

  The indirect heating type drying apparatus has a casing formed so as to descend toward the downstream side in the transport direction. At the upstream end of the casing, an input port for inputting an object to be processed is formed. In addition, a processing object storage space capable of storing a processing object input from the input port is formed inside the casing. The object to be processed accommodated in the object to be processed accommodating space is gradually moved toward the downstream side in the conveying direction by the gravitational action due to the inclination of the casing while being stirred by the blade attached to the outer periphery of the rotatable hollow shaft. .

  Heating media such as steam, heat transfer oil, and hot water are introduced into the hollow shaft, the blades, and the casing, respectively. Therefore, the object to be processed is heated when moving to the downstream side in the conveying direction while being agitated, and is changed to a liquid state, a clay state, or a powder state, for example, and disposed at the rear end of the casing. It is discharged in the state of dried powder from the sludge discharge port.

  In the indirect heating type drying apparatus described above, there is one provided with paddles that protrude from the rear end of the blade to both sides in the width direction of the blade in order to efficiently convey the workpiece (for example, Patent Document 1). reference). According to this indirect heating type drying apparatus, the object to be processed in the trough containing the rotating shaft having blades is cut and sheared by the tip of the wedge-shaped blade, and then the rear end of the blade. It is scraped up or torn by a paddle provided on the head and moved in the rotational direction. And the to-be-processed object which moved to the rotation direction is sheared by the blade | wing of the next stage, and moves further downstream.

Japanese Patent Publication No. 4-074079

By the way, the indirect heating type drying apparatus mentioned above may raise the rotation speed of a rotating shaft, in order to raise heat transfer efficiency. However, by increasing the rotation speed, the agitation speed is increased, and in the liquid and powder areas where the workpiece is extruded, the movement of the workpiece is accelerated, and sufficient dryness is obtained. Requires a larger trough volume.
For this reason, blades adjacent to each other in the axial direction of the rotating shaft may be shifted from each other in the circumferential direction so as to inhibit the movement of the object to be processed while increasing the heat transfer efficiency and reduce the moving speed.
However, when adjacent blades are shifted in the circumferential direction, as shown in FIG. 5, the blades 106 are wedge-shaped, and the paddle portions 111 of the adjacent blades 106 are arranged on the front side in the rotation direction. Since the workpiece P is caught only on the paddle portion 111 of the blade 106, the workpiece P escapes along the slope of the blade 106 arranged on the rear side in the rotation direction, and the workpiece P is rotated in the rotation direction. In some cases, the movement of the workpiece P to the discharge side is delayed and the blockage occurs.

  The present invention has been made in view of the above circumstances, and it is possible to obtain sufficient dryness without increasing the trough capacity, and to indirectly prevent the blockage due to the movement of the object to be processed. A heating type drying apparatus is provided.

In order to solve the above problems, the following configuration is adopted.
An indirect heating type drying apparatus according to the present invention is an indirect heating type drying apparatus that stirs a workpiece by a plurality of blades arranged at intervals in the axial direction with respect to a rotating shaft, and performs heating drying while transporting the workpiece. The blades adjacent to each other in the axial direction have opposing portions that face each other in the axial direction, and are arranged so that their phases are shifted in the circumferential direction of the rotating shaft, The paddle part which protrudes toward the mutually opposing part of the said adjacent blade | wing is provided.
By configuring in this way, for example, compared to the case where blades adjacent in the axial direction of the rotating shaft are arranged so as to have the same phase in the circumferential direction of the rotating shaft, The moving speed can be suppressed. In addition, each paddle that is provided at each facing portion of the adjacent blades and projects toward the facing portion rotates the workpiece disposed between the adjacent blades from both sides in the axial direction. The workpieces can be moved sequentially in the transport direction by moving in the direction. As a result, it is possible to obtain a sufficient dryness without increasing the trough capacity, and it is possible to prevent clogging due to the movement of the object to be treated.

Furthermore, in the indirect heating type drying apparatus according to the present invention, the paddle portions provided on the blades adjacent to each other in the axial direction are in phase with each other in the circumferential direction. It may be arranged.
By configuring in this way, the paddle part is disposed so as to be opposed to the object, so that it is possible to further reduce the escape of the workpiece without being caught by the paddle part.

Furthermore, in the indirect heating type drying apparatus according to the present invention, in the indirect heating type drying apparatus, the paddle part includes a first paddle part disposed at a rear end in a rotation direction of the blade, and the first of the adjacent blades. Corresponding to the arrangement of the one paddle part, it may be composed of a second paddle part arranged in the middle part in the rotational direction of the blade.
By configuring in this way, it is easy to add a second paddle part to the opposed part of the adjacent blades with respect to a general blade having the first paddle part arranged at the rear end in the rotation direction. The retention of the object to be processed can be reduced with a simple configuration.

  According to the indirect heating type drying apparatus according to the present invention, it is possible to obtain a sufficient degree of drying without increasing the trough capacity, and it is possible to prevent clogging due to the movement of the object to be processed.

It is a figure which shows the indirect heating type drying apparatus in this invention embodiment. It is the longitudinal cross-sectional view seen from the axial direction of the said indirect heating type drying apparatus. It is a perspective view which shows the inside of the said indirect heating type drying apparatus. It is a plane expanded view of the rotating shaft and blade | wing of the said indirect heating type drying apparatus. FIG. 4 is a perspective view corresponding to FIG. 3 in a general indirect heating type drying apparatus.

Next, an indirect heating dryer according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of an indirect heating type drying apparatus 1 of this embodiment.
Here, the indirect heating type drying apparatus 1 of this embodiment treats various biomass, wastes such as sewage sludge, factory wastewater sludge, food waste / slag, human waste sludge, livestock manure, plant juice lees, etc. It is an apparatus that heat-drys (reduces the water content) while stirring and conveying the material P.

  As shown in FIGS. 1 and 2, the indirect heating type drying apparatus 1 of the present embodiment includes a casing 3, which is a container provided with a trough 2 having a substantially U-shaped cross section, and a casing 3 (as a result, a workpiece P). The jacket 4 to be heated and the front side S1 of the casing 3 in the front-rear direction T (upstream side in the conveyance direction of the workpiece P) are provided so as to pass through the inside of the rear side S3 (downstream side). A rotating shaft 5 that rotates about the axis O1 by a driving device, and an inner peripheral end connected to the rotating shaft 5, protrudes in the radial direction of the center of the axis O1 of the rotating shaft 5, and extends in the circumferential direction to form a substantially sector shape. And a plurality of blades 6.

  The casing 3 is provided with a loading port 7 on the front side S1 and a discharge port 8 on the rear side S3. The front side S1 is arranged above the rear side S3, and is inclined with a predetermined inclination angle together with the rotary shaft 5. Yes. Further, the indirect heating type drying apparatus 1 has two rotating shafts 5 rotating in opposite directions in parallel inside the casing 3. These two rotating shafts 5 rotate in a direction in which the upper portions of the respective rotating shafts 5 are directed toward the respective rotating shafts 5 (in other words, when viewed from the direction of the axis O1, the right rotating shaft 5 rotates leftward and rotates leftward). The shaft 5 can be rotated to the right).

  As shown in FIGS. 1 to 3, two blades 6 are provided at the same position in the direction of the axis O <b> 1 of each rotary shaft 5 with a predetermined gap (circulation opening) in the circumferential direction around the center of the axis O <b> 1. Yes. The blades 6 are provided in a plurality of stages with two blades 6 arranged at the same position in the direction of the axis O1 as one step, with a predetermined interval in the direction of the axis O1 from the front side S1 to the rear side S3. . At this time, the predetermined gap formed between the two blades 6 in each stage is a flow path opening 9 for allowing the workpiece P to flow from the front side S1 of the casing 3 to the rear side S3. Moreover, the rotating shaft 5 and the blade | wing 6 are formed in hollow shape, and can distribute | circulate heating fluids, such as a vapor | steam, heat transfer oil, and warm water, and can heat the to-be-processed object P.

  Of the two rotating shafts 5, the blades 6 provided on one rotating shaft 5 and the blades 6 provided on the other rotating shaft 5 are alternately arranged with a predetermined gap in the direction of the axis O1. Has been. Further, the blade 6 provided on one rotating shaft 5 and the blade 6 provided on the other rotating shaft 5 overlap in the radial direction when viewed from the direction of the axis O1 when the rotating shaft 5 is rotating. Is arranged. That is, the blade 6 provided on one rotating shaft 5 can pass between the blades 6 of each stage provided on the other rotating shaft 5, and the blade 6 provided on the other rotating shaft 5 is also It is possible to pass between the blades 6 of each stage provided on the rotary shaft 5.

  The blade 6 in this embodiment has a wedge shape whose width becomes narrower toward the front in the rotational direction as seen from the radially outer side. Furthermore, the blades 6 adjacent to each other in the direction of the axis O1 have opposing portions 10 that face each other in the direction of the axis O1 on the side surface 18 that is an inclined surface forming a wedge shape. Further, the blades 6 adjacent in the direction of the axis O <b> 1 are arranged so that their phases are shifted in the circumferential direction of the rotating shaft 5. More specifically, the adjacent blades 6 in the direction of the axis O1 are arranged so that the phases are shifted in the circumferential direction, and are arranged in the same phase every other step in the direction of the axis O1.

  The blade 6 includes paddle portions 11 that protrude on both sides in the direction of the axis O1. The paddle part 11 includes a first paddle part 13 and a second paddle part 15 that are arranged at different positions in the rotational direction. Each of the first paddle portion 13 and the second paddle portion 15 includes surfaces 16 and 17 facing forward in the rotational direction at portions protruding from both sides in the direction of the axis O1. The first paddle part 13 and the second paddle part 15 can catch the workpiece P existing between the blades 6 adjacent in the direction of the axis O1 by the surfaces 16 and 17 facing forward in the rotation direction. Yes.

  FIG. 4 is a diagram in which the rotary shaft 5 and the blades 6 are partially developed in the axial direction. In FIG. 4, the horizontal direction on the paper surface is the circumferential direction of the rotation shaft 5, and the vertical direction on the paper surface is the direction of the axis O <b> 1 of the rotation shaft 5. The direction in which the rotating shaft 5 rotates is indicated by an arrow in FIG.

  As shown in FIG. 4, each of the plurality of blades 6 is formed so as to extend in the circumferential direction, and is provided with opposed portions 10 facing the blades 6 adjacent to each other in the direction of the axis O1 at the front portion and the rear portion in the rotation direction. . Each of the plurality of blades 6 includes a paddle portion 11 at the rear end of the facing portion 10. More specifically, the first paddle portion 13 is provided at the rear end portion 12 in the rotational direction of the blade 6, and the second paddle portion 15 is provided at the intermediate portion 14 ahead of the first paddle portion 13 in the rotational direction. The second paddle part 15 is arranged corresponding to the arrangement of the first paddle parts 13 of the adjacent blades 6.

  The 1st paddle part 13 and the 2nd paddle part 15 are formed so that it may protrude toward the opposing part 10 of the blade | wing 6 adjacent in an axis line O1 direction. And the 2nd paddle part 15 is arrange | positioned in the same phase so that a mutual end part may oppose with respect to the 1st paddle part 13 of the blade | wing 6 adjacent in the axis line O1 direction.

  Therefore, according to the indirect heating type drying apparatus 1 of the above-described embodiment, compared to the case where the blades 6 adjacent in the direction of the axis O1 are arranged so as to be in phase in the circumferential direction of the rotary shaft 5, Since the path openings 9 are not arranged in the same phase in the axial direction, the moving speed of the workpiece P in the transport direction can be suppressed. Moreover, the to-be-processed object P distribute | arranged between adjacent blade | wings 6 by each paddle part 11 which is provided in each opposing part 10 of the blade | wing 6 adjacent in the direction of an axis O1, and protrudes toward each other's opposing part 10 is used. It can be scraped up from both sides in the direction of the axis O1 and moved in the rotational direction. Therefore, compared with the case where it scrapes up from the one side of an axis O1, the to-be-processed object P can be sequentially moved to a conveyance direction. As a result, sufficient dryness can be obtained without increasing the trough capacity. Moreover, it can prevent that the to-be-processed object P stops moving and obstruct | occludes.

Furthermore, since the paddle part 11 is disposed to be opposed, it is possible to further reduce the workpiece P from escaping without being caught by the paddle part 11.
Moreover, since it is only necessary to additionally arrange the second paddle portion 15 on the facing portion 10 of the adjacent blade 6 with respect to the general blade 6 in which the first paddle portion 13 is arranged at the rear end in the rotation direction, it is simple. The retention of the workpiece P can be reduced with the configuration.

In addition, this invention is not restricted to the structure of embodiment mentioned above, A design change is possible in the range which does not deviate from the summary.
For example, in the above-described embodiment, the case where the first paddle portion 13 and the second paddle portion 15 are arranged so as to have the same phase in the circumferential direction has been described, but the embodiment is not limited to the same phase. For example, as long as it is within the range of the facing portion 10, it may be arranged at a position shifted in the circumferential direction.

Further, in the above-described embodiment, the case where the blade 6 is formed in a wedge shape when viewed from the outside in the radial direction has been described. However, the blade 6 such as a straight type having a constant thickness or an inclined type inclined with respect to the rotation direction. May be used. In the case of the inclined type, the first paddle part 13 and the second paddle part 15 only have to protrude in the direction of closing the space between the adjacent blades 6. What is necessary is just to provide at appropriate angles, such as a perpendicular direction.
In the embodiment described above, the case where the phases of the adjacent blades 6 are shifted by 90 degrees is taken as an example, but the phase difference is not limited to 90 degrees, for example, 45 degrees or 60 degrees. The angle may be set as appropriate. Moreover, in embodiment mentioned above, although the blade | wing 6 was provided with two or more steps | paragraphs in the axis O1 direction of the rotating shaft 5, and the case where the two blade | wings 6 were provided per step | paragraph, the three or more blade | wings 6 were provided. Also good.
Furthermore, although the case where the paddle part 11 is arranged at each rear end of the front facing part 10 and the rear facing part 10 has been described, the arrangement of the paddle part 11 is not limited to the rear end of the facing part 10. . As long as it is within the range of the facing portion 10, it may be arranged at a position other than the rear end.

In the above-described embodiment, the case where the two rotation shafts 5 are provided has been described as an example. However, the number of the rotation shafts 5 is not limited to two, and may be three or more.
Furthermore, in the above-described embodiment, the case where the two rotating shafts 5 have different phases between adjacent blades 6 has been described, but the present invention is not limited to this configuration. For example, the present invention may be applied to at least one rotating shaft 5 among the plurality of rotating shafts 5 so that the phases of the blades 6 of each adjacent stage differ from each other.

DESCRIPTION OF SYMBOLS 1 Indirect heating type drying apparatus 2 Trough 3 Casing 4 Jacket 5 Rotating shaft 6 Blade 7 Input port 8 Discharge port 9 Flow path opening 10 Opposing part 11 Paddle part 12 Rear end part 13 First paddle part 14 Intermediate part 15 Second paddle part 16 Surface facing forward in the rotational direction 17 Surface facing forward in the rotational direction 18 Side surface P Workpiece O1 Axis

Claims (3)

An indirect heating type drying apparatus that stirs a workpiece by a plurality of blades arranged at intervals in the axial direction with respect to the rotation axis, and performs heating and drying while transporting,
The blades adjacent to each other in the axial direction have opposing portions facing each other in the axial direction, and are arranged so that the phases thereof are shifted in the circumferential direction of the rotating shaft,
The indirect heating-type drying apparatus characterized by the paddle part which protrudes toward the mutually opposing part of the said blade | wing adjacent to the said opposing part.   The indirect heating type drying apparatus according to claim 1, wherein the paddle portions provided in the blades adjacent to each other in the axial direction are arranged to have the same phase in the circumferential direction.   The paddle portion is disposed at an intermediate portion in the rotation direction of the blade, corresponding to the arrangement of the first paddle portion disposed at the rear end in the rotation direction of the blade and the first paddle portion of the adjacent blade. The indirect heating type drying apparatus according to claim 1, further comprising a second paddle part.

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