JP3741473B2 - Body type dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a trunk type drying apparatus used for drying sludge, for example.
[0002]
[Prior art and its problems]
As conventional barrel-type drying apparatuses, for example, those described in JP-A-4-157000 and JP-A-55-119499 are known.
In the former, the material to be dried is dispersed by a stirring blade provided at the center of the rotating drum and dried. However, there is a problem that the material to be dried is crushed and powdered by the stirring blade. In the latter case, there is a problem that a complicated structure such as heating the drum from the outside is required to reduce the temperature distribution of the hot air for drying in the rotary drum. In any case, it has not been possible to perform satisfactory drying, and there has been a strong demand for improvement in drying efficiency.
[0003]
An object of the present invention is to provide a trunk type drying apparatus that can improve drying efficiency and can sufficiently dry an object to be dried.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the trunk type drying apparatus of the present invention comprises a drum that rotates around a horizontal axis, and has an input port for an object to be dried on one end surface side and an exhaust port on the other end surface side, In a drum-type drying apparatus in which an object to be dried thrown into a drum is dried by hot air flowing in parallel to the other end surface and discharged from a discharge port, the drum has a large central hole diameter. The baffle ring and the second baffle ring having a small diameter at the center hole are alternately arranged in parallel in the transfer direction of the object to be dried, so that the second baffle ring is separated from its outer peripheral edge. Provided with a gap between the inner wall of the drum, each of the above sections is provided with a large number of paddles for scraping up the material to be dried in the rotational direction, and in the vicinity of the outlet in the drum, The baffle cone has its tip positioned at the center of rotation. And the outer peripheral edge and is a gap between the inner wall of the drum, is characterized in that is provided.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic sectional view of a trunk type drying apparatus of the present invention. The cylindrical drum 1 rotates about the horizontal axis OO with respect to the fixed end plate 2. A peripheral edge 1 a at one end of the drum 1 is in sliding contact with the fixed end plate 2. The other end side of the drum 1 is squeezed to form a discharge port 11. The discharge port 11 is in sliding contact with a supply passage (not shown) to the next process.
[0006]
As shown in FIG. 2, which is a view taken in the direction of arrow II in FIG. 1, the fixed end plate 2 has an inlet 21 for feeding a material to be dried such as sludge pellets into the drum 1, and A feeding port 22 is provided for feeding hot air to the drum 1 while being dried in the drum 1. An arrow B in FIG. 2 indicates the rotation direction of the drum 1 with respect to the fixed end plate 2.
[0007]
In the drum 1, a large number of first baffle rings 31 and second baffle rings 32 are alternately arranged in the transfer direction A (FIG. 1) of the material to be dried, whereby the drum 1 has a large number of compartments 41 and 42. It is divided into.
[0008]
The first baffle ring 31 is a ring-shaped plate having a hole 311 having a diameter D1 at the center, as shown in FIG. 3 which is a cross-sectional perspective view taken along the line III-III in FIG. It is provided in contact. The second baffle ring 32 is a ring-shaped plate having a hole 321 having a diameter D2 smaller than the diameter D1 of the hole 311 at the center, as shown in FIG. The gap 51 is provided between the peripheral edge 322 and the inner wall of the drum 1 so as to be supported by the paddle 71 of the adjacent section 41.
[0009]
In the section 41, as shown in FIG. 5 which is a VV cross-sectional perspective view of FIG. Is provided. FIG. 6 is a development view of the section 41 of the drum 1. As shown in FIG. 6, the paddle 71 is provided in parallel with the transfer direction A.
[0010]
The partition 42 is also provided with the same number of the paddles 72 as the paddles 71 in a state of standing at right angles to the inner surface of the drum 1. FIG. 7 is a development view of the section 42 of the drum 1. As shown in FIG. 7, the paddle 72 is provided so as to incline toward the opposite side to the rotational direction B as it advances in the transfer direction A.
[0011]
A paddle 72 is provided in the compartment 41 a in the same manner as the compartment 42, a baffle cone 33 is provided in the compartment 43 immediately before the outlet 11, and a paddle is provided in the compartment between the baffle cone 33 and the outlet 11. 73 is provided in the same manner as the paddle 71. 8 is a perspective view of the baffle cone 33, and FIG. 9 is a view taken in the direction of arrow IX in FIG. The baffle cone 33 is a substantially conical plate, and is supported by a paddle 73 so that the protruding end 331 is located on the axis OO and the outer peripheral edge 332 has a gap 52 between the inner wall of the drum 1. Is provided. The baffle cone 33 is provided with the protruding end 331 facing the discharge port 11 side.
[0012]
Next, the operation will be described. In addition, the flow velocity of the hot air fed from the feed port 22 is set to such an extent that the particles to be dried that are sufficiently dried float in the portions of the holes 311 and 321 of the first and second baffle rings 31 and 32. .
[0013]
When an object to be dried is introduced into the drum 1 from the inlet 21 and hot air is supplied from the feeding port 22, the object to be dried is transferred while being dried by the hot air, and is discharged from the outlet 11 together with the hot air.
[0014]
At this time, the hot air fed into the drum 1 becomes a turbulent flow as shown in FIG. That is, the hot air collides with the first and second baffle rings 31, 32, passes through the holes 311, 321 and the gap 51, then collides with the baffle cone 33, flows to the outer peripheral side, and passes through the gap 52. And is discharged from the discharge port 11. At this time, since the first and second baffle rings 31 and 32 having different diameters of the holes 311 and 321 are alternately provided, the degree of turbulence increases. The hot air that collides with the baffle cone 33 and flows outward and passes through the gap 52 has an increased flow velocity.
[0015]
On the other hand, the thrown object to be dried first stays in the section 41a while being swept up by the paddle 72 in the section 41a, and is exposed to hot air. Since the material to be dried that has been dried to some extent in the section 41a is reduced in weight, it is transferred to the next section 42 through the hole 311 by hot air, and the material to be dried that is still insufficiently dried remains in the section 41a. It is exposed to hot air and further dried. The object to be dried that has been transferred to the section 42 also stays in the section 42 while being swept up by the paddle 71 in the section 42, and is dried by being exposed to hot air. The material to be dried that has been transferred through the holes 321 and is not sufficiently dried stays in the compartment 42 and is exposed to hot air and further dried. The material to be dried that has been transferred to the section 41 is similarly dried and transferred to the next section 42. The material to be dried is thus dried while passing through the compartments 41 and 42 and transferred to the compartment 43. The material to be dried transferred to the compartment 43 passes through the gap 52 outside the baffle cone 33 by hot air having an increased flow velocity, and is discharged from the discharge port 11 together with the hot air. In the sections 41 a and 42, the material to be dried moves by the paddle 72 and moves in the A direction, and is easily transferred to the next section.
[0016]
According to the trunk type drying apparatus having the above-described configuration, the hot air becomes a turbulent flow as shown in FIG. 10, and therefore, the thrown object to be dried is exposed to the hot air, and the drying efficiency is improved.
[0017]
In addition, since the material to be dried is not transferred to the next compartment unless it is dried to some extent in each of the compartments 41a, 42, 41, the material to be dried that is insufficiently dried stays in each compartment and is exposed to hot air for a long time. Is done. Therefore, the material to be dried that has been transferred to the compartment 43 is sufficiently dried. That is, the material to be dried is sufficiently dried.
[0018]
Moreover, since the flow velocity increases when the hot air passes through the gap 52 outside the baffle cone 33, the material to be dried that has been transferred to the section 43 is reliably discharged from the discharge port 11 without staying in the section 43. At this time, the paddle 73 divides the vicinity of the exit of the section 43 in a radial manner so that the dry matter that has been dried does not remain in the drum 1, and the entire amount is lifted along the inclination of the baffle cone 33. It functions so as to guide it smoothly to the discharge port 11. Moreover, since the baffle cone 33 is present, the hot air that has reached the section 43 is not directly discharged from the discharge port 11.
[0019]
In addition, in the trunk type drying apparatus having the above configuration, the following configuration may be adopted.
(1) The shape and dimensions of the paddles 71, 72, and 73 are not particularly limited as long as they can lift up an object to be dried. For example, as shown in FIG. 11, the tip is bent in an arc shape in the rotation direction B side, or the tip is simply bent in the rotation direction B side as shown in FIG. You may use together.
(2) The paddle 72 may be provided in the section 41 and the paddle 71 may be provided in the section 42.
[0020]
(3) The baffle cone 33 may be provided with the protruding end 331 facing away from the discharge port 11. In addition, as shown in FIG. 13, a shape in which the central longitudinal cross-sectional shape is a rhombus, that is, a shape in which two baffle cones 33 are joined at an outer peripheral edge 332 may be used as the baffle cone.
[0021]
(4) A paddle may be provided in each section in the drum 1 as follows, for example. 14 to 16 are development views of the respective sections. The section 41a in FIG. 1 is shown in FIG. 14, and the former sections 41 and 42 in the remaining sections are shown in the latter half as shown in FIG. 41 and 42 may be provided as shown in FIG. In FIG. 14, a paddle 74, a paddle 74, and a paddle 75 are provided in the transfer direction A. The paddle 75 is provided in parallel with the transfer direction A. The paddle 74 is located in the middle of the rotation direction B of the adjacent paddle 75, and is provided so as to be gradually inclined to the opposite side to the rotation direction B as it advances in the transfer direction A. In FIG. 15, a paddle 76 provided parallel to the transfer direction A from one end of the partition to the end, and a paddle 77 positioned in the middle of the rotation direction B of the adjacent paddle 76 are provided. The paddle 77 is provided so as to incline toward the opposite side to the rotational direction B as it advances in the transfer direction A. In FIG. 16, a paddle 76 and a paddle 78 positioned in the middle in the rotation direction B of the adjacent paddle 76 are provided. FIG. 17 is a cross-sectional view of the paddles 74, 75, 76 and 77 taken along the line XVII-XVII. These paddles have a shape in which the tip is bent. However, as shown in FIG. 18 which is a view taken along arrow XVIII in FIG. 14, only the paddle 75 has a tip that gradually increases in the transfer direction A. Further, as shown in FIG. 19 which is a cross-sectional view taken along the line XIX-XIX in FIG. 16, the paddle 78 is almost arc-shaped. The tip of the arcuate portion of the paddle 78 extends to the edge of the hole in the adjacent baffle ring.
According to the above configuration, the material to be dried is positively transferred by the inclined paddles 74 and 77 in the first half of the drum 1. For this reason, the to-be-dried material which is undried due to undried can be transferred without adhering to the inner wall of the drum 1 in the first half of the drum 1. In the latter half of the drum 1, the material to be dried is sufficiently retained and dried.
[0022]
【The invention's effect】
According to invention of Claim 1, there exist the following effects.
(1) Since the hot air can be made turbulent by the first and second baffle rings 31 and 32, the object to be dried can be exposed to the hot air and the drying efficiency can be improved. And since the effect of stirring and drying can be exhibited only by making a hot air into a turbulent flow, crushing of a to-be-dried object can be reduced compared with the drying apparatus which has a mechanical stirrer.
[0023]
(2) Since the material to be dried can be retained in each of the compartments 41a, 42, 41 until it is dried to some extent, the material to be dried can be sufficiently dried.
[0024]
(3) Since the baffle cone 33 can increase the flow velocity of the hot air reaching the discharge port 11, it is ensured that the material to be dried that has sufficiently dried through the respective sections 41 a, 42, 41 does not stay in the drum 1. It can be discharged from the discharge port 11.
[0025]
(4) The baffle cone 33 can prevent the hot air from being directly discharged from the discharge port 11.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a trunk type dryer according to the present invention.
FIG. 2 is a view taken along arrow II in FIG.
3 is a cross-sectional perspective view taken along line III-III in FIG.
4 is a cross-sectional perspective view taken along the line IV-IV in FIG. 1;
5 is a VV cross-sectional perspective view of FIG. 1; FIG.
FIG. 6 is a development view of a section of the drum.
FIG. 7 is a development view of another section of the drum.
FIG. 8 is a perspective view of a baffle cone.
FIG. 9 is a view on arrow IX in FIG. 1;
FIG. 10 is a schematic cross-sectional view showing the flow of hot air in the drum.
FIG. 11 is a cross-sectional view showing another example of a paddle shape.
FIG. 12 is a cross-sectional view showing still another example of a paddle shape.
FIG. 13 is a cross-sectional view showing another example of a baffle cone.
FIG. 14 is a development view of one section in another example of a paddle provided in each section in the drum.
FIG. 15 is a development view of another section in another example of a paddle provided in each section in the drum.
FIG. 16 is a development view of still another section in another example of the paddle provided in each section in the drum.
17 is an XVII-XVII cross-sectional view of the paddle in FIGS. 14, 15, and 16. FIG.
18 is a view taken along the arrow XVIII of the paddle of FIG. 14. FIG.
FIG. 19 is a cross-sectional view of the paddle of FIG. 16 taken along XIX-XIX.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drum 11 Discharge port 21 Input port 22 Feed port 31 1st baffle ring 311 and 321 hole 32 2nd baffle ring 322 and 332 Outer peripheral edge 33 Baffle cone 331 Protrusion end 41a, 41, 42 Section 51, 52 Crevice

Claims (1)

It consists of a drum that rotates around the horizontal axis and has an inlet for the material to be dried on one end side and a discharge port on the other side, and the material to be dried in the drum is dried by hot air that flows in parallel. While being transferred to the other end surface side and discharged from the discharge port,
Inside the drum, a large number of first baffle rings with a large central hole diameter and second baffle rings with a small central hole diameter are alternately arranged in parallel in the transfer direction of the object to be divided into a large number of compartments. The second baffle ring is provided with a gap between the outer peripheral edge and the inner wall of the drum,
Each of the above sections is provided with a large number of paddles for scraping the material to be dried in the rotation direction,
A drum-type drying device characterized in that a baffle cone is provided in the vicinity of a discharge port in a drum, with a protruding end positioned at the center of rotation and an outer peripheral edge with a gap between the inner wall of the drum. .

Images