JP6081765B2 - Dryer - Google Patents

Description

  The present invention relates to a dryer, and more particularly, to a dryer suitable for use in drying a processed product in which mud, lump, or powder aggregated.

  A cylindrical rotary dryer is usually used in equipment for drying a muddy, moist, or granular processed material containing moisture. In general rotary dryers, plate-shaped blades are arranged inside the cylindrical casing for lifting, and the processed material in the casing is guided along the casing, while the processed material is agitated and impacted by free fall. This is an apparatus for drying a processed product in which mud, lump or powder is aggregated from the surface with hot air or the like, and drying to a predetermined moisture content while gradually peeling the dried surface.

JP 2004-3826 A

However, this type of rotary dryer induces the processed material only by stirring and free fall in the casing, and since the hot air is blocked by the surface of the plate-like blade plate, the processed material against the hot air for drying is used. Only about 30% of the entire cross-sectional area for drying by contact is effectively utilized. Therefore, the drying efficiency tends to be low.
Moreover, the lump-like processed material is not sufficiently crushed (pulverized) only by impact caused by free fall in the casing of the rotary dryer. Therefore, only the surface of the processed product may be dried and discharged in a state where moisture remains in the processed product. For this reason, in order to improve a drying capability, there exists a problem that an apparatus must be enlarged (a casing is lengthened or the diameter of a casing is enlarged). As described above, in order to dry the processed product in which the mud, lump, or granular material is aggregated to a predetermined moisture content, in the conventional general rotary dryer, the casing is lengthened or the diameter of the casing is increased. It is necessary to increase the size.

  Here, in order to ensure the drying time, a rotary dryer having a double-pipe structure casing has also been commercialized (for example, see Patent Document 1). However, a rotary dryer having a double-pipe structure casing has the same problem as described above. For example, a rotary dryer disclosed in Patent Document 1 has a double tube structure casing having an inner cylinder and an outer cylinder surrounding the inner cylinder, and a structure for supplying a heat source from the outer cylinder to the casing. And after the processed material is guided into the inner cylinder, it is folded back to the outer cylinder and dried. However, in the technique described in this document, the heat source is supplied to the casing from the outer cylinder, and the heat source supply to the processed material in the inner cylinder is due to heat transfer from the outer cylinder, so that the moisture content is particularly high. With respect to the processed product, it is preferable to carry out a certain amount of preliminary drying on the preceding inner cylinder side, but this is insufficient for efficiently drying the processed product.

On the other hand, in order to increase the drying efficiency of the processed material in which the mud, lump or powder is agglomerated, a separate crushing (disintegration) machine is arranged after the normal rotary dryer, and this separate crushing is performed. There is also a system for finishing and drying the processed material by a machine. However, constructing such a system complicates the system and increases the installation area. For this reason, there is still room for improvement due to problems such as equipment costs and maintenance costs.
Therefore, the present invention has been made paying attention to such problems, and an object of the present invention is to provide a dryer that can efficiently dry a processed product while the apparatus is compactly configured. Yes.

In order to solve the above problems, a dryer according to an aspect of the present invention is a dryer including a casing having a double-pipe structure including an inner cylinder and an outer cylinder surrounding the inner cylinder, and the casing a guide tube for inducing along the hot air supply structure capable of supplying hot air from the tip of the inner tube, the treated product from the tip of the inner cylinder into said inner cylinder in the axial direction of the inner cylinder with respect to the inside A crusher disposed opposite to the tail end of the cylinder and rotated by a motor at the position of the tail end of the inner cylinder to crush the processed material, and the casing is supplied by the hot air supply structure The processed material introduced into the inner cylinder from the tip of the inner cylinder by initial heat is dried between the inner cylinder outer surface and the outer outer surface of the inner cylinder while the dried powder is pulverized by the pulverizer. Folded into space and guided from the tail end of the outer cylinder toward the tip of the outer cylinder And lower drying, characterized in that the discharge from the tip end of the outer cylinder.

  According to the dryer which concerns on 1 aspect of this invention, it is equipped with the casing of the double pipe structure which has an inner cylinder and the outer cylinder which surrounds this inner cylinder, The processed material introduced from the front-end | tip of an inner cylinder is an inner cylinder Since it is led from the tail end of the outer cylinder to the tip of the outer cylinder and discharged from the tip side of the outer cylinder at the position of the tail end, the apparatus can be configured compactly. In particular, since the rotary crusher is constructed as an integral type with the casing, the apparatus can be made compact, and there are great advantages both in terms of equipment costs and maintenance costs.

  Here, the processed product in which the mud, lump, or powder aggregated is likely to be dried only on the surface, and may be discharged with the inside remaining undried. Therefore, in order to increase the drying efficiency, it is an effective means to provide a pulverization (disintegration) step in the course of drying in order to increase the specific surface area of the processed product. In contrast, according to the dryer according to one aspect of the present invention, the dryer has a hot air supply structure capable of supplying hot air to the casing, and the rotary pulverizer is arranged to face the tail end of the inner cylinder. After the processed product is pulverized by this pulverizer, the processed product is folded back into the space between the inner surface of the outer cylinder and the outer surface of the inner cylinder, so that the processed product introduced into the casing is initially dried in the inner cylinder. After that, after the pulverization by the pulverizer, the processed product turned back to the space between the outer surface of the inner cylinder and the outer surface of the inner cylinder is transferred to finish drying in a state in which the processed product after the initial drying is further refined. be able to. Therefore, it is possible to efficiently dry, for example, a processed product in which mud, lump, or agglomerated particles are aggregated while the apparatus is compactly configured.

Here, in the dryer according to one aspect of the present invention, the inner cylinder has a plurality of round rod- like rods arranged in a short row or a plurality of rows in a spiral manner on the inner peripheral surface thereof. preferable. With such a configuration, a plurality of round rod- like rods are arranged in a short row or a plurality of rows in a spiral manner on the inner peripheral surface of the inner cylinder, so that the plurality of rods are processed in the inner cylinder. It becomes a conveyance mechanism, and the processed material can be efficiently transferred from the tip of the inner cylinder to the tail end. And since several rods are spaced apart, air permeability and a stirring effect are securable. Therefore, it is more suitable for promoting the drying of the processed material in the inner cylinder.

That is, for example, in the case of a conventional plate-shaped blade, since the hot air is blocked by the plate surface of the plate-shaped blade, the passage area of the hot air with respect to the cross-sectional area of the inner cylinder is extremely reduced. In contrast, a dryer in accordance with one embodiment of the present invention is to ensure proper ventilation in the inner cylinder section by arranging a plurality of rods helically, by the rod in round bar shape, merely transport Instead, it is possible to increase the contact area with the treated product and to have a stirring frame effect.

Further, in the dryer according to one aspect of the present invention, the hot air supply structure is disposed so as to surround the guide tube along the guide tube and feeds hot air into the inner tube from the tip of the inner tube. A heating channel is preferred. If it is such a structure, since a hot air is supplied directly to the inner cylinder of the casing made into the double pipe structure, the processed material in an inner cylinder can be heated directly. Therefore, for example, as in the technique disclosed in Patent Document 1, it is possible to significantly improve the drying efficiency particularly for a processed product having a high water content as compared with a drying method using heat transfer from the outer wall of the inner cylinder.

  As described above, according to the present invention, the processed product can be efficiently dried while the apparatus is compact.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the rotary dryer which is one Embodiment of the dryer which concerns on 1 aspect of this invention, The figure (a) shows sectional drawing containing an axis line, The figure (b) is a cross-sectional view of a casing ( The XX cross section in the same figure (a) is shown. It is a figure explaining the inner cylinder of the casing of FIG. 1, The figure (a) shows sectional drawing containing an axis line, The figure (b) is a cross-sectional view (Y- in FIG. Y cross section). It is a figure explaining the tail end part of the casing of FIG. 1, the same figure (a) is a principal part enlarged view of FIG. 1, The same figure (b) is ZZ sectional drawing in the same figure (a). is there.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. 1 to 3 illustrate a rotary dryer which is an embodiment of a dryer according to one aspect of the present invention.
As shown in FIG. 1, the rotary dryer 1 includes a cylindrical inner cylinder 3 and a cylindrical outer cylinder 2 disposed so as to surround the inner cylinder 3 and having a larger diameter than the inner cylinder 3. A casing 4 having a double pipe structure coaxially provided is provided. The outer cylinder 2 and the inner cylinder 3 are connected by a plurality of connecting members 7 provided at appropriate positions in the axial direction of each other. An outer surface 2 s of the outer cylinder 2 is horizontally supported by the frame 20 via a rotatable support roller 12. A plurality of support rollers 12 are arranged in the axial direction of the outer cylinder 2 (three locations in the example in the figure), and in the example in the diagram, the central support roller 12 among the three locations transmits gears and the like by the motor M1. It can be driven to rotate through the means 15. Thus, the casing 4 is driven to rotate together with the support roller 12 by driving the motor M1, so that the outer cylinder 2 and the inner cylinder 3 rotate integrally.

  An induction cylinder 5 and a heating channel 6 are attached to the casing 4. The guide cylinder 5 has an insertion port 5t that opens to the top, and a screw feeder 5a that is provided along the axial direction to the tip 3a of the inner cylinder 3 coaxially with the inner cylinder 3 and is rotationally driven by the motor M2. As a result, the guide cylinder 5 can guide the processed material S input from the input port 5t into the tip 3a of the inner cylinder 3 of the casing 4 by the screw feeder 5a.

  The heating flow path 6 is provided so as to surround the induction cylinder 5, and an inlet 6 k for introducing a high-temperature gas from a combustion chamber (not shown) is formed in the lower part of the heating flow path 6. The heating flow path 6 is attached so that the high-temperature gas introduced from the introduction port 6 k can be distributed in the inner cylinder 3 of the casing 4 toward the tip 3 a of the inner cylinder 3. Thereby, the heating flow path 6 sends out the high temperature gas used as a hot air in the front-end | tip 3a of the inner cylinder 3, heats the casing 4 from the inside of the inner cylinder 3, and heats the processed material S thrown in in the casing 4 It can be processed.

  In addition, an opening end portion of the space between the inner side surface 2n of the outer cylinder 2 and the outer side surface 3s of the inner cylinder 3 and the heating channel 6 are connected to a portion connecting the heating channel 6 and the tip 4a of the casing 4. A discharge cylinder 11 is provided so as to surround it. In the discharge cylinder 11, the side surface on the casing 4 side communicates with a space between the inner surface 2 n of the outer cylinder 2 and the outer surface 3 s of the inner cylinder 3, and the lower portion serves as the discharge port 9 for the processed product S. At the same time, the upper part is an exhaust port 10 for exhaust gas.

Here, as shown in FIG. 2, on the inner surface 3n of the inner cylinder 3, a rod-like blade 13 spirals from the tip 3a to the tail end 3b of the inner cylinder 3 as a transport mechanism for feeding the processed material S. Is provided. That is, as shown in FIGS. 1 and 2, the inner surface 3 n of the inner cylinder 3 has a plurality of rod-shaped blades 13 that send the processed material S from the tip 3 a toward the tail end 3 b. It is provided spirally along the direction. In addition, although this embodiment is an example by which the several blade | wing 13 is arrange | positioned at 2 rows of spirals, it is good also considering the helical arrangement | positioning by the several blades 13 as a short row.

  The plurality of blades 13 rotate integrally with the inner tube 3, and in the inner space of the inner tube 3, the circumferential moving force due to the rotation of the inner tube 3 and the blades 13 is axially directed toward the other end 3 b of the inner tube 3. The processed material S supplied to the inside of the inner cylinder 3 can be transferred from the tip 3a of the inner cylinder 3 toward the tail end 3b. As a result, the processed material S guided from the guide tube 5 into the tip 3a of the inner tube 3 passes through the inner tube 3 by the rotation of the casing 4, and from the tip 3a of the inner tube 3 to the tail end of the inner tube 3. It moves while being heated to the position 3b.

  Further, as shown in FIG. 3, a cage mill 8 is integrally disposed in the casing 4 as a rotary crusher at the position of the tail end 3 b of the inner cylinder 3. The cage mill 8 has two rows of cages 8n and 8s arranged to face the tail end 3b of the inner cylinder 3. The two rows of cages 8n and 8s are arranged in the space between the inner side surface 2n of the outer cylinder 2 and the outer side surface 3s of the inner cylinder 3 in the radial direction, and are arranged coaxially with the inner cylinder 3.

In each of the cages 8n and 8s, a plurality of pins provided along the axial direction on concentric circles having different diameters are arranged apart from each other in the circumferential direction. The base ends of the cages 8n and 8s are fixed to the side wall 8b, and the center of the side wall 8b is connected to the drive shaft 8a. The tip portions of the cages 8n and 8s are supported by annular side walls 8c.
In the cage mill 8, two rows of cages 8n, 8s are rotationally driven through the drive shaft 8a by the drive of the motor M3, and the processed material S that has passed through the inner cylinder 3 is first guided into the inner cage 8s, Next, the two inner and outer rows of cages 8n and 8s are crushed by colliding with the pins of each other alternately. The rotating direction of the casing 4 and the rotating direction of the cage mill 8 are set in the opposite direction. The processed product S crushed by the cage mill 8 is supplied from the other end 2b side of the outer cylinder 2 to a space between the inner side surface 2n of the outer cylinder 2 and the outer side surface 3s of the inner cylinder 3.

  Further, as shown in FIG. 3B, a plurality of lifters 14 that are equally spaced apart from each other in the circumferential direction are provided on the inner side surface 2 n of the outer cylinder 2 and between the inner side surface 2 n of the outer cylinder 2 and the inner cylinder 3. It arrange | positions radially so that it may be located in the space between 3 s of outer surfaces. As shown in FIGS. 1 and 3, the plurality of lifters 14 are provided over the entire length of the outer cylinder 2 so that the processed material S can be sent from the other end 2 b of the outer cylinder 2 to the one end 2 a. As a result, the plurality of lifters 14 rotate integrally with the outer cylinder 2 and draw up the processed material S in the space between the inner side surface 2n of the outer cylinder 2 and the outer side surface 3s of the inner cylinder 3. As shown by the arrow h in FIG. 1, the processed material S is sent from the other end 2b of the outer cylinder 2 toward the one end 2a.

Next, operation | movement and effect of the rotary dryer 1 mentioned above are demonstrated.
In a series of pulverization and drying processes by the rotary dryer 1, the processed product S containing moisture is first supplied to the inner cylinder 3 via the induction cylinder 5 formed along the heating flow path 6. Further, hot air serving as a heat source for drying is also supplied into the inner cylinder 3 from a heating channel 6 provided on the outer periphery of the induction cylinder 5.

Next, the processed material S supplied from the guide tube 5 to the tip 3a of the inner tube 3 passes through the space in the inner tube 3 as shown by the arrow f in FIG. Then, while being heated from the heating flow path 6, it is transferred to the other end 3b of the inner cylinder 3, and thereby passes through the inside of the inner cylinder 3 that is relatively close to the heat source, and is initially dried.
Next, the processed material S that has undergone some initial drying through the inner cylinder 3 is guided into the cage mill 8 from the tail end 3b outlet of the inner cylinder 3 as shown by an arrow g in FIG. The cages 8n and 8s are crushed by alternately colliding with the pins of each other. Thereafter, the processed product S is supplied from the other end 2 b side of the outer cylinder 2 to a space between the inner side surface 2 n of the outer cylinder 2 and the outer side surface 3 s of the inner cylinder 3.

  Next, the processed product S supplied to the other end 2b side of the outer cylinder 2 is sent from the other end 2b of the outer cylinder 2 toward the one end 2a as the outer cylinder 2 rotates, as indicated by an arrow h in FIG. At this time, it is further finished and dried while receiving radiant heat from the outer wall surface of the inner cylinder 3. The processed material S thus pulverized and dried is transferred to the tip 2a side of the outer cylinder 2 through the space between the inner surface of the outer cylinder 2 and the outer surface of the inner cylinder 3, and is indicated by an arrow j in FIG. As shown, it is discharged from the discharge port 9 at the bottom of the discharge tube 11. Further, the exhaust gas is discharged to the outside from the exhaust port 10 at the top of the discharge cylinder 11.

  As described above, according to the rotary dryer 1, the processed material S is initially dried in the inner cylinder 3 which is a relatively high temperature part, and then pulverized by the cage mill 8, and then the outer cylinder 2. Since it is supplied to the inside, it is possible to shift to finish drying with the outer cylinder 2 in a state in which the processed product S after the initial drying is further refined. Thus, since the processed material S reciprocates in the casing 4 having a double tube structure and undergoes heat treatment, the rotary dryer 1 is short and compact. In particular, since the cage mill 8 is constructed integrally with the casing 4, the apparatus can be made compact, and the merit is great both in terms of equipment costs and maintenance costs.

  In particular, according to the rotary dryer 1, the processed material S introduced into the casing 4 is initially dried in the inner cylinder 3 and then pulverized (crushed) by the cage mill 8, and then the inner surface of the outer cylinder 2 and the inner cylinder 3. With respect to the processed product S folded back in the space between the outer side surfaces, the processed product S after the initial drying is transferred to finish drying in a finer state. Thereby, the contact area with a hot air increases because the processed material S is refined. The refined processed product S moves from the other end 2b of the outer cylinder 2 toward the one end 2a while being repeatedly scraped and dropped by a plurality of lifters 14 installed on the inner periphery of the outer cylinder 2. During this time, contact drying with hot air and part of the contact with the outer periphery of the inner cylinder 3 allows finish drying. For this reason, it is possible to efficiently dry, for example, a processed product in which mud, lump, or agglomerates are aggregated, while the apparatus is configured compactly.

  Further, according to the rotary dryer 1, the inner cylinder 3 has a plurality of rods 13 arranged on the inner peripheral surface 3n so as to be separated in a plurality of rows (or a single row) in a spiral manner. 13 is a mechanism for transporting the processed material in the inner cylinder 3, and the processed material S is tailed from the tip 3 a of the inner cylinder 3 while being agitated by a plurality of rod-shaped blades 13 arranged spirally in the inner cylinder 3. Move to end 3b. Therefore, the processed material S can be efficiently transferred from the tip 3a to the tail end 3b of the inner cylinder 3.

And according to this rotary dryer 1, since the several blade | wing 13 arrange | positioned helically is formed in a rod shape, and the several rod 13 is arrange | positioned spaced apart, air permeability and a stirring effect are ensured. be able to. Therefore, hot air can be passed through the entire cross section of the inner cylinder 3 (excluding the surface occupied by the processed object S), which is suitable for promoting drying of the processed object S in the inner cylinder 3.
Moreover, according to this rotary dryer 1, since a hot air is directly supplied to the inner cylinder 3 of the casing 4 made into the double pipe structure, the processed material S in the inner cylinder 3 can be heated directly. Therefore, for example, as in the technique disclosed in Patent Document 1, it is possible to significantly improve the drying efficiency particularly for a processed product having a high water content as compared with a drying method using heat transfer from the outer wall of the inner cylinder.

In other words, a processed product with a high moisture content needs to be pulverized (pulverized) after performing a certain amount of preliminary drying. It is suitable for accelerating the drying of the processed product S in the inner cylinder 3 which is the former drying process for the product, and after pulverization by the cage mill 8, This is because the finish drying can be efficiently performed by the heat radiated from the outer peripheral surface of the inner cylinder 3 even for the processed product S folded back into the space between the outer side surfaces.
As described above, according to the rotary dryer 1, it is possible to efficiently dry the processed material while the apparatus is compact. It should be noted that the dryer according to the present invention is not limited to the rotary dryer according to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

1 Rotary dryer (dryer)
2 Outer cylinder 3 Inner cylinder 4 Casing 5 Induction cylinder 6 Heating flow path 7 Connecting member 8 Cage mill (rotary crusher)
9 Discharge port 10 Exhaust port 11 Discharge tube 12 Support roller 13 Blade 14 Lifter 15 Transmission means 20 Frame M1, M2, M3 Motor S Processed

Claims (3)

A drier having a double-tube casing having an inner cylinder and an outer cylinder surrounding the inner cylinder,
A hot air supply structure capable of supplying hot air to the casing from the tip of the inner tube, the guide tube to the processed material from the tip of the inner cylinder into said inner cylinder is guided along the axial direction of the inner cylinder, A pulverizer disposed opposite to the tail end of the inner cylinder and pulverized by being rotated by a motor at the position of the tail end of the inner cylinder;
The casing initially drys the treated product introduced into the inner cylinder from the tip of the inner cylinder by the heat supplied by the hot air supply structure, and removes the treated product after pulverization by the pulverizer from the outer cylinder. Folding back to the space between the inner surface and the outer surface of the inner cylinder from the tail end of the outer cylinder toward the front end of the outer cylinder, finishing and drying, and discharging from the front end side of the outer cylinder Machine. 2. The dryer according to claim 1, wherein the inner cylinder has a plurality of round rod- like rods arranged on the inner peripheral surface thereof in a short row or a plurality of rows in a spiral manner. 2. The hot air supply structure is a heating flow path that is disposed so as to surround the guide tube along the guide tube and sends hot air into the inner tube from a tip of the inner tube. Or the dryer of 2.

Images