JPH09145032A - Rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of repairing or replacing operations for refractory materials to improve degree of operation of a rotary kiln by a method wherein a cooling device for forcibly cooling refractory materials constituting a kiln body is provided so that even if temperature in the kiln body rises when matters to be treated are incinerated, temperature of the refractory materials can be prevented from rising so that erosion can be avoided. SOLUTION: Cooling device 21 for forcibly cooling refractory materials 20 constituting a kiln body 3 consists of a plurality of radiating fans 22 provided around an outer skin body 18, an annular covering body 23 covering the fins 22, and a blower device 25 for feeding cooling air 24 into the body 23, and the device 25 comprises a blower 27 and a feed pipe 30 interconnecting the blower 27 and an intake port 28 provided on the body 23.

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 incinerating a processed product such as industrial waste and for melting incinerated ash produced by burning the processed product.

[0002]

2. Description of the Related Art A conventional rotary kiln, as shown in FIG. 5, has a cylindrical kiln body 52 inclined downward from a incinerator inlet 50 toward an incinerator outlet 51 at a predetermined angle.
A support device 55 for rotatably supporting the incinerator inlet 50 side and the incinerator outlet 51 side of the kiln main body 52 on a leg 54 standing on the foundation 53, and a main body fixed to the outer peripheral portion of the incinerator inlet 50 side. A ring gear 56 for rotational drive and a rotary drive device 58 having a drive pinion 57 that meshes with the ring gear 56 are provided.

An inlet cover body 59 provided at the incinerator inlet 50 is provided with an incinerator input hopper 60 and a primary burner 61, and a secondary burner 62 having a secondary burner 62 on the incinerator outlet 51 side. A chamber 63 is provided.

The kiln body 52 is composed of an iron cylinder 64 arranged outside and a refractory material 65 lined in the cylinder 64. In the above-described configuration, the incinerated material 66 supplied to the incinerated material input hopper 60 is supplied from the incinerated material input hopper 60 into the kiln body 52, and 1
While being burned by the next burner 61, it is conveyed toward the incinerator outlet 51 while being agitated by the rotation of the kiln body 52, and the incineration residue becomes molten slag 67, is dropped and discharged from the outlet, and is burned in the kiln body 52 on the other hand. The generated gas is completely burned by the secondary burner 62 and exhausted.

The radiant heat generated during the secondary combustion heats the incinerator outlet 51 to prevent the molten slag 67 from solidifying, and the secondary burner 62 incinerates the incinerated material 66.
Becomes molten slag 67 and is discharged from the secondary combustion chamber 63.

When the incinerated material 66 is incinerated to form the molten slag 67 in this way, the temperature inside the kiln body 52 rises to 1300 ° C to 1400 ° C, but the kiln body 52 rotates to naturally radiate heat. By doing so, the refractory material 65 lined in the kiln body 52 is cooled to some extent.

[0007]

In the conventional rotary kiln described above, the refractory material 65 lined in the kiln body 52 is cooled to some extent by natural heat dissipation. However, the temperature inside the kiln body 52 is 1300 ° C to 1400 ° C.
Since the temperature rises to C, the refractory 65 is severely damaged only by natural heat dissipation, and generally, the refractory 65 must be replaced or repaired within 2 to 3 months.

Therefore, as described above, the refractory material 65 is forcibly forced.
The rotary kiln, which does not have a means for cooling the air, has a problem that the operation rate is low. Then, this invention aims at provision of the rotary kiln which can solve the said subject.

[0009]

Means for Solving the Problems The means for solving the problems in the present invention is to provide a kiln main body composed of a tubular outer cover and a refractory lining the outer cover, and the incinerator inlet of the kiln main body. When the incinerator is conveyed from the incinerator to the incinerator outlet, a cooling device for forcibly cooling the refractory is provided in the rotary kiln in which the incinerator is burned by the combustion means while stirring by rotating the kiln body. The cooling device includes a plurality of heat dissipating fins provided around the outer skin, and an annular cover that covers the heat dissipating fins.
This cover is composed of an air blower for supplying cooling air, and this air blower is composed of an air blower and a supply pipe connected between the air blower and an inlet provided in the cover. There is.

The cooling device is composed of a plurality of heat radiation fins provided around the outer skin, an annular coating for covering the heat radiation fins, and a water supply device for supplying cooling water into the coating. The water supply device includes a water supply device and a water supply pipe which is connected to the water supply device and is inserted from an intake port provided in the covering body and is provided along the upper part of the outer cover body and provided with a plurality of water supply ports on the way. It consists of

Further, the cooling device includes a plurality of heat dissipating fins provided around the outer skin, and a cooling tank installed below the kiln body along the kiln body for storing cooling water for dipping and cooling the heat dissipating fins. It consists of

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, the first embodiment of the present invention will be described based on the overall view of FIG. 1 and the enlarged perspective view of FIG. 2 by incineration of a processed product (hereinafter referred to as incinerated product) F1 such as industrial waste. Or a rotary kiln for melting incineration ash generated by incineration of the incinerated matter F1 to form a molten slag F2, which has a cylindrical shape inclined downward from the incinerator matter inlet 1 toward the incinerator outlet 2 at a predetermined angle. The kiln body 3, a support device 6 for rotatably supporting the incinerator inlet 1 side and the incinerator outlet 2 side of the kiln body 3 on a leg 5 standing on a foundation 4, and an outer peripheral portion of the incinerator inlet 1 side. A ring gear 7 for rotationally driving the main body, and a rotary drive device 11 having a drive pinion 8 meshing with the ring gear 7 and supported by legs 10 are provided.

An inlet cover body 1 provided at the incinerator inlet 1
2, a charging hopper 13 and a primary burner 14 are provided, and a secondary combustion chamber 17 provided with a secondary burner 15 for heating the incinerated material F1 into molten slag F2 on the incinerated material outlet 2 side. Is provided.

The kiln body 3 has an iron cylinder 18 arranged outside and a refractory 2 lined in the cylinder 18.
And a cooling device 21 for forcibly cooling the refractory 20.

The cooling device 21 is mounted on the foundation 4 via a plurality of heat dissipating fins 22 arranged side by side around the cylindrical body 18 and a supporting member (not shown), and these heat dissipating fins 2 are provided.
It is composed of a ring-shaped cover 23 that covers 2 and an air blower 25 for supplying the cooling air 24 into the cover 23.

The blower device 25 includes a support base 26 on the foundation 4.
A blower 27 installed through the blower 27, one side of which is connected to the blower 27, and the other side of which is inserted into the covering body 23 from an intake port 28 formed in the lower portion of the covering body 23 and arranged along the kiln body 3. A plurality of ejection holes 31 for ejecting the cooling air 24 toward the surface of the radiating fin 22 and the kiln body 3 (cylindrical body 18) are formed on the other side of the supply pipe 30. Has been done.

On the upper part of the cover 23, the heat radiation fins 2
A discharge hole 32 for discharging the cooling air 24 that has become high temperature by cooling the 2 and the kiln body 3 is formed, and the discharge hole 32 is provided with the combustion air 33 provided in the inlet cover body 12.
Is connected to the introduction path 34 of.

In the above structure, the incinerated material F1 supplied to the charging hopper 13 is supplied from the charging hopper 13 into the kiln body 3, is burned by the primary burner 14, and is agitated by the rotation of the kiln body 3. The incinerated material F1 is conveyed toward the incinerated material outlet 2 and becomes the molten slag F2 by the secondary burner 15 and the secondary combustion chamber 1
It is discharged from 7.

When the incinerated material F1 is incinerated into the molten slag F2 in this manner, the blower 27 is driven to drive the outer skin 23.
Cooling air 24 is forcibly supplied therein. Then, by the cooling air 24, the radiation fins 22 and the outer skin 2
3 is cooled, the refractory 20 is forcibly cooled through the fins 22 and the outer cover 23, and the cooling air 24 having a high temperature reaches the introduction passage 34 and the combustion air 33 and the inside of the kiln body 3. Is supplied to.

As described above, according to the first embodiment of the present invention, when the incinerator F1 is incinerated to form the molten slag F2, the temperature inside the kiln body 3 is controlled by the primary burner 14 and the secondary burner 15. Even if the temperature rises, the cooling air 24 is forcibly supplied into the outer skin body 23 to cool the radiating fins 22 to suppress the temperature rise of the refractory material 20 and prevent erosion, thereby extending the life of the refractory material 20. Therefore, the refractory 20 can be repaired and the number of replacements can be reduced, and thus the operation rate of the rotary kiln can be improved.

Further, since the cooling air 24 having a high temperature is supplied into the kiln main body 3 together with the combustion air 33 from the introduction passage 34, the fuel consumption can be reduced. Next, a second embodiment of the present invention will be described based on the overall view of FIG. 3, in which a cooling device 40 for forcibly cooling the refractory material 20 is mounted side by side around the cylindrical body 18. A plurality of heat dissipating fins 41, a ring-shaped cover 42 attached to the foundation 4 via a support member (not shown) to cover the heat dissipating fins 41, and a water supply device for supplying cooling water 43 into the cover 42. And 44.

This water supply device 44 is provided with a water supply pump (not shown), one side of which is connected to the water supply pump, and the other side of which is inserted into the covering body 42 through an intake port 45a formed in the upper portion of the covering body 42 and attached to the kiln body 3. Supply pipe 4 arranged along
6, a plurality of ejection holes 47 for ejecting the cooling water 43 toward the surface of the radiation fin 41 and the kiln body 3 are formed on the other side of the supply pipe 46.
In the figure, 45b is an outlet for the cooling water 43 formed in the upper portion of the cover 42.

Since the other structure is similar to that of the first embodiment, the same reference numerals are given and the description thereof is omitted. In the above structure, when the water supply pump is driven, the cooling water 43 is ejected from the ejection hole 47 of the supply pipe 46, which cools the surfaces of the radiation fins 41 and the kiln body 3, thereby forcibly cooling the refractory material 20. Therefore, the life of the refractory material 20 can be extended, and thus the operation rate of the rotary kiln can be improved. The cooling water 43 after cooling the radiation fins 41 and the kiln body 3 is discharged from the discharge port 4
It is discharged from 5b. Other functions and effects are similar to those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to the overall view of FIG. 4, in which a cooling device 48 for forcibly cooling the refractory material 20 is provided around the cylindrical body 18. A plurality of heat dissipating fins 49 arranged side by side and cooling water 19 for immersing and dissipating the heat dissipating fins 49 below the kiln body 3
And a cooling tank 29 for storing the water. Since other configurations are similar to those of the first embodiment,
The same reference numerals are given and the description is omitted.

In the above structure, as the kiln body 3 rotates, the radiating fins 49 are sequentially dipped in the cooling water 19 in the cooling tank 29 to be cooled, and the refractory 20 is radiated to the radiating fins 49.
Since the refractory 20 is forcibly cooled through the outer cover 23, the life of the refractory 20 can be extended and the operating efficiency of the rotary kiln can be improved. Other functions and effects are the same as those of the first embodiment.

[0026]

As is apparent from the above description, the present invention is provided with the cooling device for forcibly cooling the refractory material forming the kiln body, so that the temperature inside the kiln body rises when incinerating the incinerator. Even so, the temperature rise of the refractory can be suppressed to prevent erosion, and the number of repairs and replacements of the refractory can be reduced, so that the operating efficiency of the rotary kiln can be improved.

[Brief description of the drawings]

FIG. 1 is a partially broken entire configuration diagram of a rotary kiln showing a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part in the same manner.

FIG. 3 is a partially broken overall configuration diagram of a rotary kiln showing a second embodiment of the present invention.

FIG. 4 is a partially cutaway overall configuration diagram of a rotary kiln showing a third embodiment of the present invention.

FIG. 5 is a partially broken overall configuration diagram of a conventional rotary kiln.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incinerator inlet 2 Incinerator outlet 3 Kiln main body 6 Supporting device 11 Rotating drive device 12 Inlet cover body 13 Input hopper 17 Secondary combustion chamber 18 Cylindrical body 19 Cooling water 20 Refractory material 21 Cooling device 22 Radiating fins 23 Covering body 24 Cooling Air 25 Air blower 27 Air blower 29 Cooling tank 30 Supply pipe 31 Spout hole 40 Cooling device 41 Radiating fin 42 Covering body 43 Cooling water 46 Supply pipe 48 Cooling device 49 Radiating fin F1 Incinerator F2 Molten slag

Claims (4)

[Claims] 1. A kiln body is composed of a tubular outer body and a refractory material lined in the outer body, and when the incinerator is conveyed from the incinerator inlet to the incinerator outlet of the kiln body, the kiln is conveyed. A rotary kiln that burns incineration by a combustion means while stirring the incineration by rotating the main body, wherein the cooling kiln is provided to forcibly cool the refractory. 2. The cooling device comprises a plurality of radiating fins provided around the outer skin, an annular covering body for covering the radiating fins, and an air blower for supplying cooling air into the covering body. The rotary kiln according to claim 1, wherein the blower comprises a blower and a supply pipe connected between the blower and an inlet provided in the cover. 3. The cooling device comprises a plurality of radiating fins provided around the outer skin, an annular covering body for covering the radiating fins, and a water supply device for supplying cooling water into the covering body. The water supply device includes a water supply device and a water supply pipe which is connected to the water supply device and is inserted from an intake port provided in the covering body and is provided along the upper part of the outer cover body and provided with a plurality of water supply ports on the way. The rotary kiln according to claim 1, wherein the rotary kiln comprises: 4. The cooling device includes a plurality of heat dissipating fins provided around the outer skin, and a cooling tank installed below the kiln body along the kiln body for storing cooling water for dipping and cooling the heat dissipating fins. The rotary kiln according to claim 1, wherein the rotary kiln comprises: