JP2003262318A - Rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary kiln that can prolong the life of a refractory by efficiently cooling the refractory without requiring treatment of degradation of a shell and steam. <P>SOLUTION: A first space defining member 35 and a second space defining member 45 both fixedly disposed annularly define a first space 33 and a second space 43 respectively against a cylinder 10. Cooling pipes 20 in the cylinder 10 and the first space 33, and the cooling pipes 20 and the second space 43 are interconnected respectively via first communicating portions 15 and second communicating portions 16 opening respectively in a surface of the cylinder 10 defining the first space 33 and a surface defining the second space 43. Even when the cylinder 10 is rotated, a cooling medium flows through the first space 33, the first communicating portions 15, the cooling pipes 20, the second communicating portions 16 and the second space 43 in this order smoothly without leakage to cool the cylinder 10 appreciably. <P>COPYRIGHT: (C)2003,JPO

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 burning or melting an object to be treated such as waste.

[0002]

2. Description of the Related Art Conventionally, a rotary kiln has been known as a facility for treating ash, dust, and other objects to be treated, in which a cylindrical body having a refractory material such as brick lined in an iron shell is rotated around its axis. Has been. This rotary kiln heats and burns the object to be treated by heat from fuel combustion of a fuel combustion device such as a burner, while rotating the cylinder to move the object from the inlet side to the outlet side of the cylindrical body, It melts and discharges molten slag and the like from the outlet side.

When the object to be treated is melted in such a rotary kiln, high temperature molten slag or the like causes erosion and wear of the refractory material lined in the cylindrical body. Therefore, in the conventional rotary kiln, in order to reduce the erosion and wear of the refractory, water is applied to the iron shell of the cylindrical body from the outside to cool the refractory.

[0004]

However, when water is applied to the iron shell, deterioration of the iron shell due to rust and the like is promoted, and it is necessary to treat steam generated around the iron shell due to this cooling. .

The present invention has been made in view of the above problems, and can efficiently cool a refractory without requiring deterioration of the iron shell or treatment of steam, and can extend the life of the refractory. The purpose is to provide.

[0006]

A rotary kiln according to the present invention is provided with a tubular body, the tubular kiln being mounted on a fixed side in a rotary kiln rotated around its axis, and surrounding the outer surface of the circumferential wall of the tubular body in the circumferential direction. It forms an annular shape, and both axial ends of the annular wall are slidably contacted with the outer surface of the peripheral wall to define an annular first space with the cylindrical body, and a cooling medium can be introduced into the first space. A first space defining member, a cooling means installed in the cylindrical body and cooling the cylindrical body by a cooling medium supplied therein, and an opening on a surface defining the first space in the cylindrical body. A first continuous portion that communicates the cooling means and the first space through the opening, and a ring that is installed on the fixed side and that surrounds the outer surface of the peripheral wall of the cylindrical body in the circumferential direction, and has both axial ends thereof. When an annular second space is defined between the outer peripheral surface and the cylindrical body by sliding contact with each other. The second space defining member capable of discharging the cooling medium in the second space, and the cooling means and the second space through the opening formed in the surface defining the second space in the tubular body. And a second communication portion that communicates with each other.

According to the rotary kiln of the present invention, the first space and the second space are each formed into an annular shape along the circumferential direction of the tubular body, and the first communicating portion and the second communicating portion are the tubular body. At the first space, through the opening of the surface defining the second space, the cooling means and the first space in the cylinder, the cooling means and the second space,
Therefore, even if the cylinder is rotated, the cooling medium is smoothly and leak-freely distributed in the order of the first space, the first communication part, the cooling means, the second communication part, and the second space. Is preferably cooled.

The sliding contact portion of the first space defining member and the sliding contact portion of the second space defining member are preferably elastic seal rings. As a result, the sealing property of the sliding contact portion is improved, the leakage of the cooling medium is further reduced, and the smooth rotation of the cylindrical body is also possible.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
A preferred embodiment of the rotary kiln according to the present invention will be described in detail. In the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

FIG. 1 is a vertical sectional view showing an outline of a rotary kiln according to this embodiment.

The rotary kiln 100 of this embodiment is
A cylindrical body (cylindrical body) 10 in which an object to be treated such as ash or dust is introduced from one end side (the right side in the figure) and burns or melts inside, and the cylindrical body 10 is rotatable about the axis of the cylindrical body 10. A support drive device 50 for supporting and rotating, and a secondary combustion tower 6 into which exhaust gas from the other end side (left side in the drawing) of the cylindrical body 10 is introduced.
It has 0 and.

The cylindrical body 10 is mainly composed of a substantially cylindrical steel iron shell 11 as an outer shell, and a refractory brick 12 lined in the iron shell 11.

On the outer surface of the iron shell 11 of the cylindrical body 10, a plurality of annular support rings 51, 51 extending along the circumferential direction are arranged at intervals in the axial direction of the cylindrical body 10. The support rings 51, 51 are supported by a support drive device 50 installed on a gantry 90 serving as a fixed side, and the support drive device 50 drives the support ring 51 in the circumferential direction to form the cylindrical body 1.
0 is rotatable around the axis. Here, the cylindrical body 1
0 is supported with a slight inclination so that the other end side is lowered, and the cylindrical body 10 is rotated to transfer the internal object to be processed from one end side to the other end side.

One end of the cylindrical body 10 is closed by an inlet wall 24 serving as a fixed side. The inlet wall 24 is provided with a workpiece introducing pipe 2 for introducing the workpiece into the cylindrical body 10.
1 and a primary burner 22 that burns combustible gas discharged from a waste gasifier (not shown) with combustion air
And an air introducing pipe 23 for introducing combustion air or the like into the cylindrical body 10. The primary burner 22 raises the temperature inside the cylindrical body 10 by the heat of the high-temperature gas generated by the combustion of the combustible gas, and burns or melts the object to be processed moved inside the cylindrical body 10.

On the other hand, the other end side of the cylindrical body 10 is
It is used as a common outlet for the molten slag and the combustion exhaust gas generated by the melting of the object to be treated inside, and is inserted into the secondary combustion tower 60.

The secondary combustion tower 60 is provided with a secondary combustion chamber 60a for secondary combustion of the combustion exhaust gas discharged from the other end of the cylindrical body 10 above the other end of the cylindrical body 10 and the other end. A slag discharge part 60b that guides the dripped molten slag downward is formed on the lower side.
At the lower end of b, a movable slag cooling water tank 70 for arranging the molten slag with rapid water cooling and collecting it as granulated slag is arranged. Further, in the secondary combustion tower 60, at a position facing the inside of the cylindrical body 10, in order to further heat the inside of the cylindrical body 10, the primary burner 2
A secondary burner 25 for burning a combustible gas is installed as in the case of 2.

In particular, the rotary kiln 100 of this embodiment is provided with a cooling pipe (cooling means) 20 installed in the cylindrical body 10 for cooling the refractory bricks 12 with a cooling medium,
The cooling medium supply device (first space defining member) 35 as a fixed side that supplies the cooling medium to the cooling pipe 20 around the rotating cylindrical body 10 and the cooling pipe 20 is heated by cooling the refractory bricks 12 The cooling medium recovery device (second space defining member) 45 as a fixed side that receives the discharged cooling medium around the cylindrical body 10 is provided.

As shown in FIGS. 1 and 2, the cooling medium supplier 35 is provided outside the iron shell 11 of the cylindrical body 10 in the vicinity of the center in the axial direction and forms an annular shape along the circumferential direction of the cylindrical body 10. As shown in FIGS. 2 and 3, a facing ring 30 having a predetermined width and facing the steel skin 11 and being separated from the steel skin 11 by a predetermined distance.
Is equipped with. Annular rubber seal rings (elastic seal rings) 31, 31 made of a rubber elastic material, which are opposed to each other and which are in sliding contact with the iron skin 11 over the entire circumference, are respectively fixed by screws to both ends in the axial direction of the facing ring 30.
Iron skin 11, opposing ring 30 and rubber seal ring 3
An annular first space 33 is defined by 1 and 31.

A liner 99 is attached to the surface of the iron skin 11 which is in sliding contact with the rubber seal ring 31, as shown in FIG. 3, to further improve the sealing property and wear resistance of the sliding contact portion.

Further, in the vicinity of the center in the axial direction outside the iron shell 11 of the cylindrical body 10, as shown in FIGS. 2 and 3, the cooling medium supply device 35 is separated in the axial direction of the cylindrical body 10. ,
The cylindrical body 1 has the same structure as the cooling medium supplier 35.
A cooling medium recovery device (second space defining member) 45 that defines an annular second space 43 is provided between the cooling medium recovery device and the cooling medium recovery device.

As shown in FIG. 2, the opposing ring 30 of the cooling medium supplier 35 and the opposing ring 30 of the cooling medium recovery unit 45 are respectively prevented from rotating on the mount 90 by rotation preventing members 86 and 87. The opposing rings 30, 30 of the cooling medium supply device 35 and the cooling medium recovery device 45 are fixed to each other by a plurality of connecting rods 37 penetrating the opposing rings 30, 30 in the axial direction of the cylindrical body 10. .

Rotatable rollers 38 are installed at both ends of these connecting rods 37, respectively.
Are guided by annular guide rails 39, 39 projecting in the circumferential direction on the outer surface of the iron shell 11 of the cylindrical body 10. These guide rails 39, 39 and rollers 3
8 is a cooling medium supply device 35 when the cylindrical body 10 is rotated.
Also, the gap between the cooling medium collector 45 and the cylindrical body 10 is maintained at a predetermined distance, and the sealability of the first space 33 and the second space 43 is improved.

A cooling medium introduction pipe 41 for introducing the cooling medium from below into the first space 33 is connected to the opposing ring 30 of the cooling medium supply device 35, while a cooling medium recovery device 45 is provided.
A cooling medium discharge pipe 40 that discharges the cooling medium upward from the second space 43 is connected to the opposing ring 30. The cooling medium discharged from the cooling medium discharge pipe 40 is
After being cooled by a cooling tower or the like (not shown), it is circulated through the cooling medium introducing pipe 41.

Further, as shown in FIG. 2, the cooling medium supplier 35 and the cooling medium collector 45 cover the cooling medium supplier 35 and the cooling medium collector 45 from the outside as a fixed side. And a drain pipe 49 is installed at the lower end of the cover 44.

On the other hand, the cooling pipe 20 in the cylindrical body 10 is shown in FIG.
As shown in FIG. 3 and FIG. 3, the cylindrical body 10 is axially installed between the iron shell 11 and the refractory brick 12, and the cooling medium flows therein. As shown in FIG. 2, the cooling pipe 20 extends in the axial direction from the position corresponding to the cooling medium feeder 35 between the iron shell 11 and the refractory brick 12 to the other end side of the cylindrical body 10. It is inverted at the other end and extends to one end side in the axial direction, and is inverted again at the one end and extends to a position corresponding to the cooling medium collector 45.

The cooling pipe 20 as described above is provided in the iron shell 1.
1 and the refractory bricks 12 are arranged in parallel in the circumferential direction of the cylindrical body 10.

Further, in the cylindrical body 10, as shown in FIGS. 2 and 3, the ends of these cooling pipes 20 on the cooling medium supply device 35 side and the first space 33 are the first space 33 in the cylindrical body 10. The cooling pipe 2 is provided with a first series pipe (first series part) 15 communicating with each other through an opening opened on the surface defining
The end of the cooling medium collector 45 on the side of the cooling medium collector 45 and the second space 43,
A second communication pipe (second communication portion) 16 that communicates through an opening that is opened in the surface that defines the second space 43 in the cylindrical body 10;
Is equipped with.

As shown in FIG. 3, mortar 80, for example, is filled between the iron shell 11 and the refractory brick 12 in which the cooling pipe 20 is arranged. The heat of 12 can be efficiently removed.

Next, the operation of the rotary kiln 100 according to this embodiment will be described.

The object to be treated such as waste is introduced into the cylindrical body 10 through the object to be treated introduction pipe 21, and the cylindrical body 10 is also introduced.
To rotate. In addition, the primary burner 22 and the secondary burner 2
Combustion gas is introduced into the cylindrical body 10 from 5 and combustion air or the like is introduced from the air introduction pipe 23.

As a result, the object to be processed is moved from the one end side to the other end side in the cylindrical body 10 and is heated and burned, and the ash and the like are further melted, and the molten slag is generated in the cylindrical body 10. While falling from the other end side and rapidly cooled with water, it is recovered as water-cooled slag, and the combustion exhaust gas from the cylindrical body 10 is introduced into the secondary combustion chamber 60a from the other end side for secondary combustion.

When the rotary kiln 100 is operated as described above, a cooling medium such as cooling water is supplied from the cooling medium introducing pipe 41 to the cooling medium supply device 35. At this time,
The cooling medium introduced from the cooling medium introduction pipe 41 is introduced into the first space 33 and then into the cooling pipe 20 through the first series pipe 15 formed in the cylindrical body 10, and the cooling pipe 20.
The refractory bricks 12 are circulated inside to cool the refractory bricks 12. The cooling medium heated by this cooling passes from the other end of the cooling pipe 20 to the second space 43 in the cooling medium recovery unit 45 via the second communication pipe 16.
The cooling medium in the second space is discharged to the outside via the cooling medium discharge pipe 40.

Then, such a cooling medium cylinder 10 is used.
The refractory brick 12 is efficiently cooled by the inward distribution, and the erosion wear of the refractory brick 12 is reduced. In particular, it is preferable that the vicinity of the axial center of the cylindrical body 10, which is easily corroded by erosion, be used as the cooling water inlet.

Here, the first space 33 and the second space 43
Are formed in an annular shape along the circumferential direction of the cylindrical body 10, and the first continuous pipe 15 and the second communication pipe 16 define a first space 33 and a second space 43 in the cylindrical body 10. Even though the cylindrical body 10 is rotated by being communicated with the cooling pipes 20 through the openings of the surfaces, the cooling medium is still in the first space 33 and the first continuous pipe 1.
5, the cooling pipe 20, the second communication pipe 16, and the second space 43 are smoothly distributed in this order without leakage.

Further, in the cooling medium supply device 35 and the cooling medium recovery device 45, the sliding contact portion with the cylindrical body 10 is sealed by the rubber seal ring 31, so that the sealing performance is further enhanced, and the cylindrical body 10 is also improved. Is rotating smoothly.

Further, since the cooling medium is configured to first go to the other end side of the cylindrical body 10, that is, the outlet side, and then to the one end side, that is, the inlet side, the cooling medium is heated to a high temperature by the molten slag, etc. The other end side of the cylindrical body 10, which is the environment, is preferentially cooled, and the erosive wear of the refractory brick 12 is further reduced.

The rotary kiln 10 according to the present invention.
0 is not limited to the above embodiment, and various modifications can be made.

For example, in the above embodiment, the cooling pipe 20 is used as the cooling means, but a cooling jacket or the like may be used.

Further, in the above embodiment, the cooling pipe 20 is arranged over the entire axial direction of the cylindrical body 10. However, for example, in order to more intensively cool the other end portion where erosion wear is likely to occur, the other end portion is cooled. You may arrange | position so that it may extend only to the part side.

Further, in the above embodiment, the introduction and discharge of the cooling medium are performed in the vicinity of the center in the axial direction, but the cooling medium introduction pipe 41 and the cooling medium discharge pipe 40 are easily installed, so The introduction and discharge may be performed on the inlet side of the cylindrical body 10.

Further, in the above embodiment, the cooling medium supply device 35 and the cooling medium recovery device 45 and a group of the first series passage pipe 15, the cooling pipe 20, and the second communication pipe 16 corresponding to them are set as one set. However, a plurality of sets may be provided in the axial direction, and the heat removal amount may be controlled in the axial direction by changing the flow rate of the cooling medium or the like for each set.

[0042]

As described above, in the rotary kiln according to the present invention, the first space defining member installed on the fixed side and the annular first space between the first space defining member and the tubular body by the second space defining member, The second space is defined, and the cylinder defines the first space defined by the cylinder, the first communicating portion that is opened in the surface that defines the second space, and the second communicating portion, and the inside of the cylinder. Since the cooling means and the first space and the cooling means and the second space are respectively communicated with each other, even if the tubular body is rotated, the cooling medium is the first space,
The first series communication part, the cooling means, the second communication part, and the second space are circulated smoothly without leakage, and the cylindrical body is cooled appropriately.

With this, the refractory can be efficiently cooled without requiring deterioration of the steel shell or treatment of steam, and a rotary kiln capable of extending the life of the refractory is provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary kiln according to the present embodiment.

FIG. 2 is a partially cutaway perspective view of the cylindrical body in FIG.

FIG. 3 is a vertical cross-sectional view showing a cooling medium supply device and a cooling medium recovery device in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cylindrical body (cylindrical body), 15 ... 1st communication pipe (1st communication part), 16 ... 2nd communication pipe (2nd communication part), 20 ... Cooling pipe (cooling means), 31 ... Rubber seal ring (Elastic seal ring), 33 ... First space, 35 ... Cooling medium supply device (first space defining member), 43 ... Second space, 45 ... Cooling medium collecting device (second space defining member), 100 ... Rotary kiln.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27B 7/24 F27B 7/24 7/38 7/38 F term (reference) 3K061 KA02 KA09 KA10 KA15 KA23 3K065 AA07 AB01 AB03 AC01 FA06 FA15 FB02 FC07 4K061 AA08 BA12 CA19

Claims (2)

[Claims] 1. A rotary kiln having a tubular body, wherein the tubular body is rotated around its axis, is installed on a fixed side, forms an annular shape surrounding a peripheral wall outer surface of the tubular body in a circumferential direction, and Both ends are slidably contacted with the outer surface of the peripheral wall to define an annular first space with the cylindrical body, and a cooling medium can be introduced into the first space. A member, a cooling unit that is installed in the cylindrical body, and cools the cylindrical body with a cooling medium supplied into the cylindrical body; and an opening formed in a surface that defines the first space in the cylindrical body. A first communication part that communicates the cooling means with the first space, and a ring that is installed on the fixed side and that surrounds the outer surface of the peripheral wall of the cylindrical body in the circumferential direction, and both axial ends thereof are the peripheral wall. When each of the outer surfaces is slidably contacted with each other to define an annular second space with the cylindrical body. A second space defining member capable of discharging the cooling medium in the second space, and the cooling means and the opening through an opening formed in a surface of the tubular body defining the second space. A rotary kiln, comprising: a second communication portion that communicates with a second space. 2. The rotary kiln according to claim 1, wherein the sliding contact portion of the first space defining member and the sliding contact portion of the second space defining member are elastic seal rings.