JP2881537B2 - Rotary kiln - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln that incinerates industrial waste and the like and heats and burns an object to be fired, and more specifically, burns combustion gas (high-temperature gas) from a burner or the like directly into the rotary kiln. The present invention relates to a firing rotary kiln for heating and firing an object to be fired and continuously supplied.

[0002] In the present specification, the terms "start end" and "end end" of a rotary kiln are used with reference to the flow of an object to be treated.

[0003]

2. Description of the Related Art A conventional rotary kiln is shown in FIG.
(A) is a vertical sectional view of the rotary kiln, and FIG.
(B) is a cross-sectional view taken along the line BB in (A)), as shown in FIG. 7). The rotary kiln body (10) includes a high-temperature zone (10a) at the end and a low-temperature zone (10b) at the start. )When,
An object to be fired (2) provided at the beginning of the main body in a downwardly inclined shape, a burner (3) provided at the end of the main body, and a product outlet (4) provided at the bottom of the main body end Are the main components. And, the main body (19) of the rotary kiln main body (10) is usually made of a metal having low heat resistance (for example, rolled steel for general structure), and the inner surface of the main body (19) is made of a fire-resistant brick for heat insulation. (11) or protected with castable refractories. In addition, an inlet hood (12) is provided at the start end of the rotary kiln body (10), and an outlet hood (13) is provided at the end. Further, a drive girth gear (14) is attached to the rotary kiln body (10), and the rotary kiln body (10) is rotated by a motor and a speed reducer (not shown). Then, the tire (15), the roller (16), and the bearing mounted in the circumferential direction of the body (10) on the starting end side and the end side of the rotary kiln body (10), respectively.
(17) and the support stand (18), the rotary kiln body
(10) is rotatably supported.

[0004] In the rotary kiln having such a configuration, the object to be fired is introduced into the medium / low temperature zone (10b) of the rotary kiln body (10) from the object inlet (2). Then, a high-temperature combustion gas is blown into the kiln from the burner (3), and as the main body (10) rotates, the solid material to be fired is lifted along the inner surface of the main body (10) having an arc-shaped cross section. Then, this falls, exposing a new surface, firing is performed, and the object to be fired is moved to the high temperature zone (10a).
Then, the fired product is taken out from the product outlet (4).

[0005]

However, in such a rotary kiln, the operation and operation of the rotary kiln are difficult.
Due to the repeated stoppage, the thermal expansion coefficient of the metal body (19) and the refractory brick (11) are different, so the joints are damaged, the brick structure is loosened, and the brick fragments are mixed in the product. there were. In addition, the inner surface of the main body (19) is
Because of the protection in 1), the surface of the brick was worn due to the rolling of the material to be fired, again causing brick fragments to mix into the product.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a rotary kiln in which foreign substances are not mixed into a product and the thermal strength of the rotary kiln main body is guaranteed.

[0007]

That is, the rotary kiln of the present invention comprises a rotary kiln main body comprising a high-temperature zone on the end side and a medium-low temperature zone on the start side, and a firing object inlet provided at the start end of the main body. In a rotary kiln provided with a burner provided at the end of the main body and a product outlet provided at the bottom of the main body end, the high-temperature zone of the rotary kiln main body is made of heat-resistant steel disposed inside the main body and the main body. And a gap between the main body cylinder and the inner cylinder is filled with a heat insulating material.

[0008]

The rotary kiln of the present invention has the following features.
The high-temperature zone of the rotary kiln body has a double body structure consisting of a body body and an insert cylinder made of heat-resistant steel placed inside the body body. Incorporation of brick debris into the product, as in the case of protection, cannot occur. Further, since the gap between the main body and the insertion cylinder is filled with a heat insulating material, high heat in the high-temperature zone is not transmitted to the main body.

[0009]

Next, the present invention will be described in detail with reference to embodiments shown in the drawings, but the present invention is not limited to these embodiments.

FIG. 1 is a specific example of a rotary kiln according to the present invention. FIG. 1A is a vertical sectional view of the rotary kiln, and FIG. 1B is a sectional view taken along line BB in FIG.

In FIG. 1, a rotary kiln according to the present invention has a rotary kiln body (1) comprising a high-temperature zone (1a) on the end side and a medium-low temperature zone (1b) on the start end, and a downwardly inclined shape at the start end of the rotary kiln. Sintered object inlet provided (2)
And a burner (3) provided at the end of the main body and a product outlet (4) provided at the bottom of the main body.

The main body (5) of the rotary kiln body (1) has a cylindrical shape and is made of heat-resistant steel SUS310S. In the high temperature zone (1a) of the main body (1),
Inside the (5), an inner cylinder (6) made of heat-resistant steel SUS310S having a substantially cylindrical shape is arranged, and has a double trunk structure. The insertion cylinder (6) only needs to have strength enough to maintain its own shape. The inner cylinder (6) includes a first inner cylinder (6a) positioned at the end side of the main body (1) and a second inner cylinder provided at a predetermined distance from the first inner cylinder (6a). It consists of an insertion cylinder (6b).
The end of the main body (1) of the first insertion cylinder (6a) and the start end of the main body (1) of the second insertion cylinder (6b) are formed so as to be in contact with the main body cylinder (5). In addition, the first insertion cylinder (6a) and the second insertion cylinder (6
A cylindrical overlapping member (6c) is arranged so as to close the interval of b). The overlapping member (6c) is also made of SUS310S. In this embodiment, the insertion cylinder (6) is divided into two, but may be divided into three or more.

The main body cylinder (5) thus formed and the inner cylinder
The gap (6) is filled with ceramic fibers as a heat insulating material (7). Also, on the outer side of the inner insertion cylinder (6), intermittently in the circumferential direction, so as to abut against the inner wall of the main body trunk (5),
A support member (8) is attached.

The other configuration in FIG. 1 is the same as that in FIG. 2, and the description is omitted. That is, the inlet hood (12), the outlet hood (13), the drive girth gear (14),
Tires (15), rollers (16), bearings (17) and support bases (1
8) are the same as those in FIG.

In the rotary kiln having such a configuration, a high-temperature combustion gas is blown into the kiln from the burner (3), the high-temperature zone (1a) near the burner (3) is set at about 900 ° C., and the medium-low-temperature zone (1b). ) At about 500 ° C. and about 300 ° C. near the inlet hood (12). The object to be fired is supplied to the rotary kiln body (1) through the object to be fired (2).
Into the low-temperature zone (1b). Then, with the rotation of the main body (1), the solid object to be fired becomes
(1) It is lifted along the inner surface, then it falls and a new surface is exposed, firing is performed, and the object to be fired is moved to the high temperature zone (1a), and the fired product is
It is taken out from the product outlet (4).

In the above rotary kiln, the high temperature zone (1a) of the rotary kiln body (1) has a double barrel structure composed of a body barrel (5) and an insertion barrel (6), as shown in FIG. As in the case where the inner surface of the main body is protected by a fire-resistant brick, no brick fragments are mixed into the fired product. The gap between the main body (5) and the insertion cylinder (6) is filled with ceramic fiber as heat insulating material (7), so the high heat of the high-temperature zone (1a) is transmitted to the main body (5). Nothing. Therefore, the main body (5) is not corroded or damaged by the high temperature.

Further, in the rotary kiln, the inner cylinder (6) is composed of the first inner cylinder (6a) and the second inner cylinder (6b), and there is a predetermined interval between the two inner cylinders. In addition, the difference in thermal expansion between the main body cylinder (5) and the insertion cylinder (6) can be absorbed. A support member (8) is attached to the outer side of the inner insertion cylinder (6) so as to abut the inner wall of the body trunk (5).
The shape of the insert cylinder (6) is retained, and the insert cylinder (6) and the body (5)
Is maintained. This support member (8)
Since it is intermittently mounted in the circumferential direction of (6), heat transfer from the inner cylinder (6) to the main body cylinder (5) does not concentrate at a certain position.

The insert cylinder (6), the stacking member (6c), the heat insulating material (7) and the support member (8) are interchangeable and economical.

[0019]

Since the rotary kiln of the present invention is constructed as described above, no brick fragments can be mixed into the product. Further, the high heat in the high temperature zone is not transmitted to the rotary kiln main body, and the main body is not corroded or damaged by high temperature.

Further, since the rotary kiln of the present invention does not use refractory bricks unlike the conventional rotary kiln, the structure of the kiln is simplified, the kiln manufacturing process is shortened, and the kiln is reduced in weight. A reduction in the support strength of the kiln body and a reduction in driving power are provided.

[Brief description of the drawings]

FIG. 1A is a vertical sectional view showing a specific example of a rotary kiln according to the present invention. (B) ... It is sectional drawing which follows the BB line in figure (A).

FIG. 2A is a vertical sectional view showing a conventional rotary kiln. (B) ... It is sectional drawing which follows the BB line in figure (A).

[Explanation of symbols]

 (1)… Rotary kiln body (1a)… High temperature zone (1b)… Medium and low temperature zone (2)… Substance to be fired (3)… Burner (4)… Product outlet (5)… Body body (6)… Insertion cylinder (6a)… First insertion cylinder (6b)… Second insertion cylinder (6c)… Overlapping member (7)… Insulation material (8)… Support member

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tadashi Moriyama 5-3-28 Nishikujo, Konohana-ku, Osaka Inside Nippon Shipbuilding Co., Ltd. (56) References JP-A-53-78907 (JP, A) (58) ) Field surveyed (Int. Cl. ⁶ , DB name) F27B 7/00-7/42 F23M 5/00

Claims (1)

(57) [Claims] 1. A rotary kiln body (1) comprising a high-temperature zone (1a) on the end side and a medium-low temperature zone (1b) on the start side;
A rotary kiln having a workpiece input port (2) provided at the beginning of the main body, a burner (3) provided at the end of the main body, and a product outlet (4) provided at the bottom of the main body. In the high-temperature zone (1
a) has a double-body structure consisting of a body barrel (5) and an insert cylinder (6) made of heat-resistant steel placed inside the body barrel (5).
A rotary kiln characterized in that a gap between the (5) and the insertion cylinder (6) is filled with a heat insulating material (7).