JP2000241078A - Rotary kiln - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To increase the heat absorption area of a heated object supplied to a cylindrical body to absorb heat. Kind Code: A1 A kiln main body for moving an object to be heated from one end to another end and heating the kiln main body, and an inner wall of the kiln main body provided in a direction from one end to the other end of the kiln main body by rotation of the kiln main body. And a drum 28 that rolls along line 15. The drum 28 has an enlarged portion 35 extending from one end 32 to the other end 33 on one end 32 side to which the object to be heated a is supplied, and the kiln body 10 has an inner shape on one end side of the kiln body. Are formed in a shape along the outer shape of the enlarged portion 35. On the outside of the enlarged portion 35, a groove 37 for allowing the object to be heated a to enter is provided. The drum 28 is formed in a hollow shape and opens at one end 32 and the other end 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln for heating an object to be heated. Here, the heating includes heating performed for drying, reforming, thermal decomposition, reaction, or the like.

[0002]

2. Description of the Related Art In a rotary kiln that supplies and heats an object to be heated to a cylindrical kiln body, the object to be heated tends to stay in a lower portion of the kiln body. The heat-absorbing part (or heat-receiving part that receives heat) that the heated object absorbs heat is limited to the top and bottom surfaces of the heated object accumulated in the lower part of the kiln body, and the heat-absorbing area where the heated object absorbs heat is It is as small as about 15% of the kiln body inner wall area. In particular, when the object to be heated is a resin, magnesium oxide, calcium oxide, or the like, only the top and bottom surfaces of the object to be heated are heated, and this portion tends to dry and harden. Therefore, these objects to be heated cannot perform uniform heat absorption over the whole.

[0003] By the way, there has been known a method in which a heat-resistant rod longer than the inner diameter of the kiln body is present in a kiln body and the inorganic powder is fired (Japanese Patent Laid-Open No. 2-166385). This rotary kiln prevents a sticky substance from adhering to the inner wall of the kiln when the inorganic powder is fired by a heat-resistant rod, and enables long-time operation.

[0004]

However, a method in which a heat-resistant rod is provided inside a kiln body (Japanese Patent Laid-Open No. 16663/1990).
No. 85), a heat-resistant rod scrapes off the deposits adhering to the inner wall of the kiln body and enables long-time operation. However, from the viewpoint of efficient heat absorption of the object to be heated, It does not increase the heat absorption area where the object absorbs heat.

[0005] It is an object of the present invention to increase the heat absorption area of the object to be heated supplied to the cylindrical body to absorb heat.

[0006]

In order to solve the above-mentioned problems, a rotary kiln according to the present invention comprises a cylindrical body for heating an object to be heated by moving it from one end to the other end, and a rotating body provided in the cylindrical body. Is provided. Since the rotating body is provided from one end to the other end, when the cylindrical body rotates, the rotating body rolls along the inner wall of the cylindrical body. The object to be heated is sandwiched between the rotating body and the cylindrical body and pushed out along the inner wall of the cylindrical body due to the rolling of the rotating body, so that it does not solidify in one place but has an area where heat is transmitted from the cylindrical body to the heated object. Certain heat absorption area is increased, and heat absorption efficiency is improved. The object to be heated is uniformly heated,
Heating is promoted.

[0007] Further, at one end side of the rotating body to which the object to be heated is supplied, there is provided an enlarged portion which extends from one end of the rotating body to the other end, and the inner shape of the cylindrical body at one end side is the same. It is good to be formed in the shape along the outside shape of the enlarged part. The object to be heated supplied to the cylindrical body falls before one end of the rotating body. The fallen object to be heated is sandwiched between the enlarged portion of the rotating body and the cylindrical body, and at the same time rides on the rotating body and rotates. The object to be heated rotates on the outer surface of the rotating body, falls to the biting side, is stretched in the body parallel part of the rotating body, and is heated while repeating this.

Further, it is preferable to provide a groove outside the enlarged portion for allowing an object to be heated to enter. The object to be heated supplied to the cylindrical body falls before one end of the rotating body and enters the groove of the rotating body. This groove creates a trigger for the object to be heated on the outer surface of the rotating body, and facilitates the object to be rotated on the outer surface of the rotating body.

Further, the rotary kiln of the present invention is arranged such that the outer surface on one side of the rotating body is located below the supply port through which the object to be heated is supplied into the cylindrical body. The object to be heated falling from the supply port of the cylindrical body falls on the outer surface of the rotating body. The object to be heated that has fallen on the outer surface of the rotating body rotates together with the rotating body and falls to the biting side. The object to be heated that has fallen to the biting side is reliably pushed and extended by the rotating body.

[0010] A plurality of rotating bodies may be provided in the cylindrical body. For example, when two rotating bodies are provided, the object to be heated that has fallen on the outer surface is bitten between the two rotating bodies and falls on the lower inner wall of the cylindrical body. The object to be heated which has fallen on the inner wall of the cylindrical body is pushed and stretched and spreads to increase the heat absorption area. At this time, if the plurality of rotating bodies are rotatably connected to each other, the object to be heated that has fallen between the adjacent rotating bodies is likely to be bitten between the two rotating bodies. In particular, if a gap for biting is provided between the two rotating bodies, biting becomes easier. Further, the plurality of rotating bodies are rotatably connected to each other, and the rotating directions of the adjacent rotating bodies are set to be opposite to each other, whereby the biting is further promoted.

Further, by forming the rotating body in a hollow shape and opening at one end and the other end, a part of the generated gas generated at the time of heating the object to be heated can be removed from the hollow portion of the rotating body. The flow of the generated gas is facilitated by passing through. Also,
By making the rotating body hollow, a heating means is provided in the rotating body to heat the inside, or by passing a high-temperature gas through the inside, the object to be heated is heated from both the cylindrical body and the rotating body. You can also.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a rotary kiln according to the present invention will be described below in detail with reference to the drawings. 1 to 8, the same or equivalent parts are denoted by the same reference numerals.

FIG. 1 is an overall vertical sectional view showing a first embodiment of a rotary kiln according to the present invention. The rotary kiln of the first embodiment heats an object to be heated a to perform drying, reforming, thermal decomposition, or a reaction, and in particular, an object to be heated which is easily solidified by heating, such as a resin, magnesium oxide, and calcium oxide. It can be suitably used for the object to be heated.

The rotary kiln of the first embodiment includes a supply device 3 for supplying an object to be heated a, a kiln body 10 which is a cylindrical body which receives and heats the object to be heated a supplied from the supply device 3, and a kiln. The heated object b heated and processed by the main body 10 is discharged, and the generated gas Gg generated during the heating is discharged.
And a discharge device 45 for discharging the wastewater. Furthermore, the rotary kiln of the first embodiment is provided with an external heating type heating means 51, for example, an electric heater, a heating device or a burner for sending high-temperature steam, combustion gas, heated air or the like between tubes as a double tube type. Use a direct heating device.

The supply device 3 has a hopper 4 to which the heating target a is supplied, and a screw feeder 6 for feeding the heating target a to the kiln body 10. Screw feeder 6
Is extended to the inside of a charging pipe 17 provided on one end 12 side of the kiln body. Screw feeder 6
Are rotated and driven by the driving device 8. The hopper 4 is supplied with an inert gas Gi. Although the supply device 3 of the first embodiment uses the screw feeder 6, the present invention is not limited to this, and for example, a pusher, an air conveyance, a conveyor, a snake pump, or the like can be appropriately selected and used.

The kiln body 10 has a cylindrical shape and is rotated and driven by a driving device 22 having a rotating mechanism provided outside the kiln body. Supply pipe supply port 18
Is heated from the one end 12 to the other end 13. A motor-driven striking device 24 is provided on one end 12 side of the kiln main body, and the adhering matter adhering to the inner wall of the kiln is peeled off by striking.

The discharge device 45 has a discharge port 47 for discharging the processed object to be heated b from below through a valve 48, and an exhaust port 46 for discharging generated gas Gg generated in the kiln body. Further, a pneumatic impact device 49 is provided below the discharge device 45, and the impact device 24 of the kiln body is provided.
Similarly, the object to be heated b that has been treated and adhered to the wall surface is peeled off.

The rotary kiln of the first embodiment is a rotating body which is provided in the direction from one end 12 to the other end 13 of the kiln main body and rolls along the inner wall of the kiln main body 10 by the rotation of the kiln main body 10 in addition to the above devices. A certain drum 28 is provided. The drum 28 has an enlarged portion 35 extending from one end 32 to the other end 33 on one end 32 side to which the object to be heated a is supplied, and in this embodiment, the enlarged portion 35 has a conical shape. It is a truncated cone with the head of the body cut off. The kiln main body 10 has a conical portion 16 in which the inner shape on one end 12 side of the kiln main body 10 is formed in a truncated cone shape along the outer shape of the enlarged portion 35. The other end 33 of the drum 28
In the case of this embodiment, the partition is made in a direction perpendicular to the outer surface, but is not limited thereto. And the drum 28
Is formed in a hollow shape having a hollow portion 38 and opens at one end 32 and the other end 33.

Although the cross-sectional shape of the drum 28 in the first embodiment is a hollow circle, the present invention is not limited to this.
The cross section of the drum may be polygonal,
It may be hollow, and is appropriately selected according to the kiln size and the drum size.

The rotary kiln of the first embodiment having the above-described structure operates as follows. That is, in FIG. 1, the heated object a supplied to the kiln body 10 is heated at one end by rotating the kiln body 10.
It is moved from 2 to the other end 13 and heated. At this time, the drum 2
8 is provided in the direction from one end 12 to the other end 13, so that when the kiln body 10 rotates, it rolls along the inner wall 15 of the kiln body 10. Heated object a supplied to kiln body 10
Fall before one end 32 of the drum. The dropped object a moves between the enlarged portion 35 of the drum and the conical portion 16 of the kiln body by the rotation of the kiln body 10 and the rolling of the drum 28.

FIG. 2 is a sectional view taken along the line II of FIG. As the kiln body 10 rotates in the direction of the arrow 53 (counterclockwise), the drum 28 rotates in the direction of the arrow 54 (counterclockwise), and the object to be heated a is expanded with the enlarged portion 35 of the drum and the cone of the kiln body. And between the parallel portion 36 of the drum and the inner wall 15 of the kiln body, and is spread along the inner wall 15 of the kiln body, and rotates and bites on the outer surface of the drum. Fall to the side. While repeating this, it moves from one end 12 to the other end 13. During this time, the heat absorption area, which is the area where heat is transmitted from the kiln body 10 to the object to be heated a, is increased, and the heat absorption efficiency is improved. Further, the object to be heated a is uniformly heated, and the heat treatment is promoted.

In the rotary kiln of the first embodiment, the heat absorption area is (circumferential ratio ÷ 2) when the object to be heated “a” is spread to approximately half the height of the inner wall 15 of the kiln body with an appropriate thickness. X kiln body diameter x kiln body length = 50
%, Which is more than three times the heat absorption area as compared with the conventional rotary kiln.

Further, since the drum 28 is formed in a hollow shape and has a hollow portion 38 and is opened at one end 32 and the other end 33, the generated gas Gg generated when the object a is heated is heated. Is passed through the hollow portion 38 of the drum 28,
The flow of the generated gas Gg is facilitated.

Further, by forming the drum 28 as a hollow type, even in the case of an object a to be heated which cannot be heated by an internal heat type in which the kiln body is directly heated, radiant heat cannot be expected by heating the drum 28 itself. The object to be heated a can be heated from the drum 28 side even at the temperature, and the heat absorption area further increases. A heating means such as a heater is provided in the hollow portion 38 of the drum 28 to heat the inside, or a high-temperature gas is passed through the inside of the drum 28, or even if the object to be heated a cannot be directly heated by a fire, the inside of the drum 28 is heated. By performing heating by fire, a heating method other than the heater can be adopted, and the object to be heated a can be heated from both the kiln body 10 and the drum 28.

FIGS. 3A and 3B show a second embodiment, in which FIG. 3A is a longitudinal sectional view of a main part, and FIG. 3B is a sectional view taken along line II-II of FIG. In the rotary kiln according to the second embodiment, a groove 37 is provided outside the enlarged portion 35 of the drum 28 so that the object to be heated a can enter. In this embodiment, the groove 37 is provided in the parallel portion 36 of the drum.
Is formed so as to gradually become shallower. Kiln body 1
The heated object a supplied to 0 falls in front of one end 32 of the drum and enters the groove 37 of the kiln body. The object to be heated a that has entered the groove 37 is caught by the enlarged portion 35 and easily rides on the drum 28 and rotates. The structure and operation of the other parts in FIG. 3 are the same as those of the first embodiment in FIGS.

FIG. 4 is an overall vertical sectional view showing the third embodiment. In the rotary kiln of the third embodiment, an outer surface 39 on one end 32 side of a small-diameter drum 30a, which is a rotating body, is located below a supply port 18 through which a heating target a is supplied into the kiln main body 10. The object to be heated a that falls from the supply port 18 of the kiln body falls to the outer surface 39 on the one end 32 side of the small-diameter drum 30a. The object to be heated a that has fallen on the outer surface 39 of the small-diameter drum rotates together with the small-diameter drum 30a and drops to the biting side. The object to be heated a that has fallen to the biting side is reliably pushed by the small-diameter drum 30a. In addition,
In FIG. 4, a striking device corresponding to the striking device 24 shown in FIG. 1 is not shown, but it is preferable to have a striking device.

FIGS. 5A and 5B show a third embodiment, in which FIG. 5A is a sectional view taken along line III-III of FIG. 4, and FIG. 5B is a sectional view taken along line IV-IV of FIG. As shown in FIG. 5A, the kiln body 10
Rotates in the direction of arrow 53, the small-diameter drum 30a rotates in the direction of arrow 54. The heating target a dropped from the supply port 18 of the charging pipe 17 to the outer surface 39 of the small-diameter drum 30a rotates in the direction of the arrow 54 together with the small-diameter drum 30a, and falls to the biting side. The object to be heated a that has fallen to the biting side is reliably pushed by the small-diameter drum 30a, and the heat absorption area is enlarged. As shown in FIG. 5B, the movement of the small-diameter drum 30a from the one end 12 to the other end 13 of the kiln body is stopped by the support ring 26. The support ring 26 is fixed to the kiln body 10 by, for example, four support members 26a. The structure and operation of other parts in FIGS. 4 and 5 are the same as those in the first embodiment in FIGS.
The description is omitted.

FIG. 6 is a cross-sectional view showing the fourth embodiment. The rotary kiln of the fourth embodiment includes a plurality of, for example, two small-diameter drums. The plurality of small diameter drums in the kiln body 10 rotate in the same direction about center lines parallel to each other. Similarly to the third embodiment, the outer surface 39 on one end side of the small-diameter drums 30a, 30b is provided below the supply port 18.
Is located. The object to be heated a that falls from the supply port 18 of the kiln body falls to the outer surface 39 between the small-diameter drum 30a and the small-diameter drum 30b. The object to be heated a that has fallen on the outer surface 39 between the small-diameter drums 30a and 30b is caught between the two small-diameter drums 30a and 30b, and falls on the inner wall 15 of the kiln body. The object to be heated a that has dropped onto the inner wall 15 is reliably pushed between the small-diameter drums 30a and 30b and the inner wall 15 of the kiln body, and the heat absorption area is enlarged. The structure and operation of the other parts in FIG. 6 are the same as those of the third embodiment in FIGS.

FIG. 7 is a cross-sectional view showing the fifth embodiment. The rotary kiln of the fifth embodiment is provided with a plurality of small-diameter drums, for example, two, as in the fourth embodiment.
It is rotatably connected. The small-diameter drums 30a and 30b
The connecting members 40a are rotatably connected to each other at a predetermined distance from each other. The connecting member 40a is preferably provided at both one end 32 and the other end 33 of the small-diameter drum because the rotation is stable. The heating target a falling from the supply port 18 of the kiln body falls between the small-diameter drum 30a and the small-diameter drum 30b. Since a certain gap is formed between the two small-diameter drums 30a and 30b, the dropped object to be heated a is caught in the gap and falls on the inner wall 15 of the kiln body.
The object to be heated a dropped on the inner wall 15 is a small-diameter drum 30a, 3
Ob and the inner wall 15 of the kiln main body are reliably pushed, and the heat absorption area is enlarged. The structure and operation of the other parts in FIG. 7 are the same as those of the fourth embodiment in FIG.

FIG. 8 is a cross-sectional view showing the sixth embodiment. The rotary kiln of the sixth embodiment has a plurality of small-diameter drums, for example, three, as in the fifth embodiment. In this case, the small-diameter drum 30a and the small-diameter drum 30b are arranged separately via the connecting member 40b, and the small-diameter drum 30b and the small-diameter drum 30c are arranged in contact with each other. It is preferable that the connecting member 40b be provided at both one end 32 and the other end 33 of the small-diameter drum because the rotation is stable.

When the kiln body 10 rotates in the direction of arrow 53, the small-diameter drum 30a and the small-diameter drum 30b rotate in the directions of arrows 54 and 55 (counterclockwise), respectively. On the other hand, since the small-diameter drum 30c rotates in contact with the small-diameter drum 30b, when the small-diameter drum 30b rotates in the direction of the arrow 55, it rotates in the direction of the arrow 56 (clockwise). Therefore, the small-diameter drum 30a and the small-diameter drum 30c rotate in directions opposite to each other. When the object to be heated falls between the small-diameter drums rotating in opposite directions, the object to be heated a is easily bitten. The heating target a dropped between the small-diameter drum 30a and the small-diameter drum 30c is caught in the gap and falls on the inner wall 15 of the kiln body. Heated object a dropped on the inner wall 15
Is reliably extended between the small-diameter drums 30a and 30b and the inner wall 15 of the kiln body, and the heat absorption area is enlarged. Since the structure and operation of the other parts in FIG. 8 are the same as those of the fifth embodiment in FIG. 7, the description thereof will be omitted.

[0032]

According to the rotary kiln of the present invention, the heat absorption area of the object to be heated supplied to the cylindrical body for absorbing heat can be increased.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing a first embodiment of a rotary kiln according to the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

3A and 3B show a second embodiment, in which FIG.
(B) is a sectional view taken along the line II-II of (A).

FIG. 4 is an overall vertical sectional view showing a third embodiment.

5A and 5B show a third embodiment, and FIG.
FIG. 4B is a sectional view taken along line IV-IV in FIG. 4.

FIG. 6 is a cross-sectional view showing a fourth embodiment.

FIG. 7 is a transverse sectional view showing a fifth embodiment.

FIG. 8 is a transverse sectional view showing a sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Kiln main body (cylindrical body) 12 One end 13 Other end 15 Inner wall 18 Supply port 28 Drum (rotating body) 30a, 30b Small diameter drum (rotating body) 32 One end 33 The other end 35 Enlarged portion 37 Groove 39 Outer side surface a Cover Heated object

[Procedure amendment]

[Submission date] March 18, 1999 (1999.3.1.1)
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 10 Kiln body (cylindrical body) 12 One end 13 Other end 15 Inner wall 18 Supply port 28 Drum (Rotating body) 30a, 30b, 30c Small-diameter drum (Rotating body) 32 One end 33 The other end 35 Enlarged portion 37 Groove 39 Outer surface a Heated object

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsuo Shigeru 1-Yawata Kaigan-dori, Ichihara-shi, Chiba F-term (reference) 4K061 AA08 BA07 BA09 CA23 EA02 EA06

Claims (7)

[Claims] 1. A cylindrical body which rotates and moves an object to be heated from one end to the other end to heat it, and is provided in a direction from one end to the other end of the cylindrical body, and rotates on the inner wall of the cylindrical body by rotation of the cylindrical body. A rotary kiln comprising a rotating body that rolls along. 2. The rotating body according to claim 1, wherein the rotating body has an enlarged portion on one end side to which the object to be heated is supplied, the enlarged portion extending from the one end to the other end. A rotary kiln in which the inner shape on one end side of the cylindrical body is formed in a shape along the outer shape of the enlarged portion. 3. The rotary kiln according to claim 2, wherein a groove through which the object to be heated enters is provided outside the enlarged portion. 4. The rotary kiln according to claim 1, wherein an outer surface on one end side of the rotating body is located below a supply port through which the object to be heated is supplied into the cylindrical body. 5. The rotary kiln according to claim 4, wherein a plurality of said rotating bodies are provided. 6. The rotary kiln according to claim 5, wherein said plurality of rotating bodies are rotatably connected to each other. 7. The method according to claim 1, wherein
A rotary kiln, wherein the rotating body is formed in a hollow shape and is open at one end and the other end.