JPH1111607A - Industrial waste chute for treatment furnace - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the inclination of a chute as much as possible to increase the depth of insertion into the inside of a treatment furnace, and nevertheless to smoothly slide industrial waste and to industrial waste to a desired position. Provided is a chute for industrial waste input of a processing furnace capable of supplying materials. SOLUTION: A chute 40 for inputting industrial waste into a processing furnace.
Is a chute outer cylinder 42 which is inclined so as to become lower from the discharge side end of the processing furnace 1 toward the inside of the processing furnace, and a bottom plate located on the side of the inner industrial waste input of the two adjacent bottom plates. A lower edge of a predetermined length (length L) above a lower edge of a bottom plate located inside the processing furnace with a predetermined height-direction gap (height T) therebetween. Pressurized air is supplied to a plurality of bottom plates 44 that are arranged so as to overlap with each other, and an air passage 45 surrounded by a lower portion of the chute outer cylinder and the plurality of bottom plates. And pressurized air supply means 46 for injecting pressurized air from the space formed therebetween to slide industrial waste without clogging the plurality of bottom plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chute for charging industrial waste to be installed in a processing furnace, and more particularly to a processing furnace of a type having a longitudinal length longer than a diameter of the processing furnace. TECHNICAL FIELD The present invention relates to an industrial waste input chute of a processing furnace capable of supplying industrial waste to a position.

[0002]

2. Description of the Related Art General and industrial wastes have been conventionally incinerated except for special ones. By performing incineration, the volume of waste can be reduced in a short time.
Furthermore, incineration treatment is a sanitary and excellent treatment method because the product after treatment becomes a small amount of inorganic ash.

In recent years, a large amount of scrap cars has been generated as garbage in the automobile society. This is disassembled and divided into metals such as engines and chassis and non-metals such as plastic parts and instruments. The non-metal parts are finely cut into shredder dust and then subjected to water separation. Lightweight dust that floats on water includes urethane and lightweight plastic, and non-lightweight dust that sinks in water includes fiber scraps, rubber, and copper wires.
It has been considered that these light-weight dusts and non-light-weight dusts are preferably subjected to combustion treatment by separating them from the difference in properties at the time of combustion. In particular, since the lightweight dust contains a plastic additive and an organic chlorine-based compound such as vinyl chloride, highly intoxicating dioxins are generated by incineration. Dioxins have been found to produce precursors of dioxins by incomplete incineration of refuse and to form dioxins in an oxidizing atmosphere outside the furnace.

In order to suppress the generation of dioxins, it is necessary to completely incinerate waste in a furnace. As a specific condition, first, the temperature in the furnace is always 700
It is necessary to maintain a high temperature of at least 850 ° C, preferably at least 850 ° C. Dioxins can be almost completely decomposed at a high temperature of 700 ° C. or more, preferably 850 ° C. or more. Second, it is necessary to provide sufficient residence time for decomposition. Third, it is necessary to form a vortex to make sufficient contact with the air to be incinerated.

Conventionally, as an incinerator satisfying these conditions, a rotary kiln / stoker combined type incinerator shown in FIG. 5 has been used. The rotary kiln / stoker combined incinerator is a combined incinerator in which a stoker type incinerator 80 for secondary incineration is connected to the residue discharge side of the rotary kiln incinerator 71.

[0006] The rotary kiln incinerator 71 feeds waste to be incinerated from one of the cylindrical rotary furnaces 72. The inside of the furnace is maintained at a high temperature of 800 ° C. or more, preferably 850 ° C. or more by a combustion burner 78. The waste moves along the slope while being stirred in a high-temperature atmosphere, and is dried, thermally decomposed, and incinerated to produce exhaust gas and incineration residues.

[0007] The incineration residue falls onto the grate 82 of the stoker-type incinerator 80. The grate 82 is of a movable type, and sequentially sends out the residue in an obliquely downward direction. Meanwhile burner 85
And air is supplied from between the grate 82 to completely incinerate the residue. Finally, it is discharged by the residue discharge conveyor 84.

The exhaust gas is supplied with secondary incineration air in a secondary combustion chamber 86 of a stoker type incinerator 80, diffused and incinerated in a high-temperature atmosphere, and sent to a gas processing facility (not shown) in a subsequent process. . At this time, the temperature of the exhaust gas drops to 3
At about 00 degrees, dioxins may be resynthesized. For this reason, the high-temperature exhaust gas is rapidly cooled to about 200 degrees before the gas treatment facility.

[0009]

In a conventional rotary kiln / stoker combined type incinerator, different types of incinerators are connected and used. For this reason, facilities necessary for operating the incinerator, such as an auxiliary burner and a blower for supplying incineration air, are required for two furnaces. In particular, the large amount of fuel used in the auxiliary burner has greatly increased the processing cost.

Accordingly, the present inventors have proposed an incineration method capable of economically incinerating industrial waste containing an organochlorine compound while suppressing generation of dioxins in a single furnace, and to carry out the method. And applied for a patent (Japanese Patent Application No. 9-88705). In a processing furnace of a type having a longer length in the longitudinal direction than such a diameter, it is necessary to supply industrial waste to a position deep inside the processing furnace. Development was requested.

Accordingly, an object of the present invention is to reduce the inclination of the chute as much as possible to increase the insertion depth into the inside of the processing furnace, and nevertheless to smoothly slide the industrial waste and reach the desired position. An object of the present invention is to provide an industrial waste input chute of a processing furnace capable of supplying industrial waste.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a chute used for charging industrial waste into a processing furnace. While forming the slide surface of industrial waste in the shape of a slide,
Provided is a chute for charging industrial waste into a processing furnace, wherein a plurality of pressurized air injection ports are provided on a sliding surface at predetermined intervals to promote the sliding of industrial waste.

[0013] The industrial waste sliding down the sliding surface is blown off by the pressurized air injected from the injection port,
It slides down smoothly on the sliding surface.

According to a second aspect of the present invention, there is provided a chute outer cylinder which is inclined so as to become lower from the discharge side end of the processing furnace toward the inside of the processing furnace, and a plurality of tubes fixed inside the chute outer cylinder. Bottom plates, each of the bottom plates being inclined so as to become lower from the discharge side end of the processing furnace toward the inside of the processing furnace, and the inner industrial waste input side of each of two adjacent bottom plates. The bottom edge of the bottom plate located at a position above the upper edge of the bottom plate located inside the processing furnace is separated by a gap in a predetermined height direction and overlaps over a predetermined length in a longitudinal direction. A plurality of bottom plates, and pressurized air is supplied to an air passage surrounded by a lower portion of the chute outer cylinder and the plurality of bottom plates, and from a space formed between each two adjacent bottom plates. Injecting pressurized air to block industrial waste on multiple bottom plates Be is comprise configure and pressurized air supplying means for sliding without providing industrial waste poured chute of the processing furnace according to claim.

The angle of the outer casing of the chute and the plurality of bottom plates fixed to the inside of the chute with respect to the horizontal is as small as possible within a range in which industrial waste can slide down without being clogged in the chute. The tip of the chute can be located deep inside the processing furnace, and accordingly, industrial waste is supplied deep inside the processing furnace. The pressurized air supply means supplies pressurized air to an air passage surrounded by a lower portion of the chute outer cylinder and a plurality of bottom plates. The pressurized air is injected from a space formed between each two adjacent bottom plates. The industrial waste slides on the plurality of bottom plates while being blown off by the pressurized air and does not stop on the bottom plates. The injection speed of the pressurized air is determined by the cross-sectional area of the space formed between each two adjacent bottom plates and the air pressure. Further, the position where the industrial waste is finally supplied to the processing furnace is determined by the type of the industrial waste and the wind speed, amount and angle of the pressurized air.

According to a third aspect of the present invention, in the chute for charging industrial waste of the processing furnace according to the second aspect, the processing furnace is rotatably arranged in a slightly inclined state and has a refractory lining inside. And a first chamber provided at a predetermined position in the cylinder so as to form an opening at the center, and a first chamber positioned relatively lower and a second chamber positioned relatively higher in the cylinder. And a burner of a long frame provided at the end of the cylindrical body toward the opening of the partition at the end of the first chamber side so that the flame reaches the partition, and the second chamber side of the cylindrical body An air supply device is provided near the opening of the partition and supplies air for combustion into the second chamber.

The industrial waste supplied from the chute is supplied to the first chamber of the cylinder located on the discharge side of the processing furnace.
Due to the rotation of the processing furnace, the industrial waste gradually moves to the discharge side while inverting and burns. On the other hand, the combustion gas is completely burned in the second room under a high temperature environment by the flame reaching the partition supplied from the burner.

The invention described in claim 4 is the invention according to claim 2 or 3
In the industrial waste charging chute of the processing furnace described in the above,
A partition is provided spirally around the inside of the cylinder at a position 5 to 15 m from the discharge side end of the processing furnace.
It has a wind speed and an angle at which industrial waste falling on the bottom plate can be blown off from half the distance from the discharge end of the processing furnace to the partition to the position where the partition is provided. .

The time during which industrial waste stays in the processing furnace is as follows:
It is determined by the inclination, rotation speed, etc. of the processing furnace. When the partition is provided at a position of 5 to 15 m from the discharge end of the processing furnace, and industrial waste is supplied from half of the distance from the discharge end of the processing furnace to the partition to the position where the partition is provided, industrial Sufficient residence time required for complete combustion of waste can be secured. Since the partition has a spiral shape, the industrial waste entering the second chamber beyond the partition is returned to the first chamber and burned.

According to a fifth aspect of the present invention, there is provided the chute for charging industrial waste of the processing furnace according to any one of the first to fourth aspects, wherein the industrial waste is a light-weight shredder dust containing an organochlorine compound. And water is supplied after water separation.

The light-weight shredder dust burns while gradually moving to the discharge side in the first chamber, while the combustion gas completely burns in a high-temperature environment in the second chamber by the burner of the long frame. No harmful dioxin is generated even if it contains an organic chlorine compound.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a chute for charging industrial waste in a processing furnace according to the present invention will be described in detail based on the illustrated preferred embodiment.

First, an industrial waste incinerator in which the industrial waste input chute according to the present invention is installed will be described.

The incinerator 1 for industrial waste generally includes a long cylindrical body 10, an air supply device 20 for supplying air for secondary combustion, a long frame burner 30, and a processing furnace according to the present invention. It is configured to include an industrial waste input chute 40.

The cylindrical body 10 is for incineration of waste and complete combustion of gas generated at that time. The cylindrical body 10 is arranged horizontally with the discharge port 16 for discharging the incineration residue being slightly lower. Cylindrical body 10
Is rotatably supported by rollers 18 and the like. Here, the arrangement of the cylindrical body 10 includes that the cylindrical body having an inclined inner peripheral surface is arranged substantially horizontally.

The cylindrical body 10 has a driving device (not shown), and can rotate at a predetermined speed on a roller 18 provided below the outer periphery of the cylindrical body. The dimensions of the illustrated cylindrical body 10 are such that the maximum diameter is about 5 m and the length is about 50 m.

The inside of the cylindrical body 10 is lined with a refractory 14 on its inner periphery to improve fire resistance. In addition, refractory 14
Need not be lined with the entire inner periphery of the cylindrical body 10. The purpose can be sufficiently achieved by lining the refractory 14 only in a range where the waste actually burns and the furnace temperature becomes high. In the illustrated cylindrical body 10, the refractory 1
4 lining.

A partition 15 is provided inside the cylindrical body 10 at a predetermined position from an end on the side where waste is charged. The illustrated cylindrical body 10 is provided at a position about 10 m from the end on the side where the waste is charged. In addition, partition 15
Is provided in such a manner that the inner diameter of the cylindrical body 10 is a predetermined size, for example, a height that can be reduced to approximately half of the inner diameter of the cylindrical body 10, and as shown in FIG.

By providing the partition 15, the inside of one cylindrical body 10 can be divided into a primary combustion chamber 11 and a secondary combustion chamber 12. In the primary combustion chamber 11, waste is mainly incinerated, and in the secondary combustion chamber 12, it is mainly used for completely burning the gas generated in the primary combustion chamber 11. Further, it is possible to prevent waste from entering the primary combustion chamber 11 into the secondary combustion chamber 12. Further, by making the partition 15 helical, the waste that has entered the secondary combustion chamber 12 from the primary combustion chamber 11 can be removed again while the cylindrical body 10 is rotating.
1 can be returned. The time during which the industrial waste stays in the processing furnace is determined by the inclination, rotation speed, and the like of the processing furnace.
When the partition 15 is provided at a position 5 to 15 m from the discharge port 16 side of the processing furnace and the industrial waste is supplied from half to the position of the partition 15, a sufficient residence time required for complete combustion of the industrial waste is obtained. For example, one hour can be secured.

The air supply device 20 is provided on the outer periphery of the cylindrical body 10 near the inlet of the secondary combustion chamber 12. The air supply device 20 is provided to supply combustion air for completely combusting the gas supplied from the primary combustion chamber 11.

The long flame burner 30 is used for heating the primary combustion chamber 11 and the secondary combustion chamber 12. As shown in FIG. 1, the long frame burner 30 is provided at an end on the side of the primary combustion chamber 11 toward the center of the cylindrical body 10. The long frame burner 30 is preferably capable of generating a flame that reaches not only the primary combustion chamber 11 but also the secondary combustion chamber 12. When the flame reaches the partition 15, the gas flow velocity at the opening of the partition 15 can be increased. Furthermore, since the partition is provided in a spiral shape, rotation is given to the flame and the vortex effect can be increased.

By using the long frame burner 30, the primary combustion chamber 11 and the secondary combustion chamber 12 can be heated by one burner. For this reason, the fuel cost, which accounts for most of the incineration costs, can be reduced and the combustion equipment can be reduced to one.

Next, the industrial waste charging chute 40 of the processing furnace according to the present invention will be described in detail.

The chute 40 includes a chute outer cylinder 42 having a rectangular cross section, a plurality of bottom plates 44 fixed inside the chute outer cylinder 42, and a pressurized air supply source 46.
It is comprised including. The chute outer cylinder 42 is SU
It is made of a heat-resistant metal such as S304, and is arranged so as to be inclined from the discharge end of the processing furnace toward the inside of the processing furnace. The inclination angle α is set as small as possible within a range where the industrial waste can slide down without being clogged in the chute. The tip of the chute can be located deep inside the processing furnace, and accordingly, industrial waste is supplied deep inside the processing furnace. Similarly, the bottom plate 44
It is made of heat-resistant metal such as SUS304 and is welded to both side walls of the chute outer cylinder 42. Each bottom plate 44 is arranged at an angle approximately equal to that of the chute outer cylinder 42 so as to become lower from the discharge end of the processing furnace toward the inside of the processing furnace. As best shown in FIG. 3, the bottom plate 4 located above each two adjacent bottom plates 44
4 has a predetermined length (length L) above the upper edge of the bottom plate 44 with a predetermined gap (height T) in the height direction and a predetermined length (length L) in the longitudinal direction. Are placed overlapping each other.

The pressurized air supply source 46 is
The pressurized air is supplied to an air passage 45 surrounded by a lower portion of the base plate and a plurality of bottom plates 44. The pressurized air is injected from a space 43 formed between each two adjacent bottom plates. The industrial waste slides down on the plurality of bottom plates 44 while being blown off by the pressurized air, and does not stop on the bottom plates 44. The injection speed of the pressurized air is determined by the cross-sectional area of the space 43 formed between each two adjacent bottom plates and the air pressure. In addition, the position of industrial waste to be finally supplied to the processing furnace depends on the type of industrial waste, the wind speed of pressurized air,
It depends on the air volume and angle. Preferably, the cylindrical body 1
It is blown off from the outlet 16 of 0 to a position of 3 m or more. The pressurized air also has a role as secondary combustion air for burning industrial waste in the primary combustion chamber 11, and is also used for cooling the chute outer cylinder 42 and the bottom plate 44. Thereby, the life of these members can be extended.

(Embodiment) The cylindrical body 10 had a diameter of about 5 m and a length of 50 m. The partition 15 is the outlet 1
A spiral blade provided at a position 10 m from the end on the sixth side. A test chute outer cylinder 42 having a total length of about 5 m and a square cross section with a side of 40 cm was used. The bottom plate 44
Those having a length of 0.5, 1, 1, 1, 1, 0.5 m were used. The dimension of the space 43 is the height T = 12 m in the case of the example 1.
m, width 40 cm, and the overlap margin L = 5 cm, and in the case of Example 2, the height T = 7.5 mm, the width 40 cm, and the overlap margin L = 5 cm. There are 5 spaces 43, 48 square c per space
m and a cross-sectional area of 30 square cm. As the pressurized air supply source 46, a source having an air flow of 11 cubic meters / minute and an original pressure of 4.5 kg / square cm during use was used.

Table 1 shows the wind speed and air volume in the space 43. In addition, ~ indicates the number of the space 43 from the top.

[Table 1] In addition, the sliding state of the industrial waste in the chute 40 was evaluated and summarized in Table 2.

[Table 2] As shown in Example 1, when lightweight dust was used as the industrial waste, it was found that the industrial waste smoothly slid off at an angle α of 36 ° or more. On the other hand, in Example 2 in which the wind speed was slightly higher than that in Example 1, it was found that the industrial waste smoothly slipped when the angle α was 32 degrees or more.

[0038]

According to the present invention, the chute for charging industrial waste of the processing furnace according to the present invention is provided with a chute outer cylinder which is arranged so as to become lower from the discharge end of the processing furnace toward the inside of the processing furnace, and a chute outer casing. A plurality of bottom plates fixed inside the cylinder,
Each bottom plate is disposed so as to be inclined so as to become lower from the discharge end of the processing furnace toward the inside of the processing furnace, and the lower edge of the bottom plate located on the inner industrial waste input side of each of two adjacent bottom plates. A plurality of bottom plates whose ends are arranged above the upper edge of the bottom plate located inside the processing furnace with a gap in a predetermined height direction and overlapped over a predetermined length in a longitudinal direction; ,
Then, pressurized air is supplied to an air passage surrounded by a lower portion of the chute outer cylinder and the plurality of bottom plates, and the pressurized air is jetted from a space formed between each two adjacent bottom plates to thereby produce industrial air. A pressurized air supply means for sliding the waste without clogging the plurality of bottom plates, so that the length of the longitudinal direction is longer than the diameter, The industrial waste was able to be smoothly slid down deep in the area.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an industrial waste incinerator provided with an industrial waste charging chute according to the present invention.

FIG. 2 is a left side view of the industrial waste input chute shown in FIG.

FIG. 3 is a perspective view schematically showing the industrial waste input chute shown in FIG.

FIG. 4 is a front view showing a cross section of a part of an industrial waste incinerator provided with an industrial waste charging chute according to the present invention.

FIG. 5 is a perspective view of a conventional rotary kiln / stoker combined incinerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incinerator 10 Cylindrical body 11 Primary combustion chamber 12 Secondary combustion chamber 14 Refractory 15 Partition 20 Air supply device 30 Long frame burner 40 Chute 42 Chute outer cylinder 43 Space 44 Bottom plate 45 Air passage 46 Pressurized air supply source

Claims (5)

[Claims] 1. A chute used for charging industrial waste into a processing furnace, wherein the chute has a sliding surface in the form of a slide from the discharge end of the processing furnace toward the inside of the processing furnace. A plurality of pressurized air injection ports provided at predetermined intervals to promote the sliding down of industrial waste, wherein a chute for charging industrial waste into a processing furnace. 2. A chute outer cylinder which is inclined so as to become lower from the discharge side end of the processing furnace toward the inside of the processing furnace, and a plurality of bottom plates fixed inside the chute outer cylinder, Each bottom plate is disposed so as to be inclined so as to become lower from the discharge end of the processing furnace toward the inside of the processing furnace, and the lower edge of the bottom plate located on the inner industrial waste input side of each of two adjacent bottom plates. A plurality of bottom plates whose ends are arranged above the upper edge of the bottom plate located inside the processing furnace with a gap in a predetermined height direction and overlapped over a predetermined length in a longitudinal direction; And supplying pressurized air to an air passage surrounded by a lower portion of the chute outer cylinder and the plurality of bottom plates, and injecting pressurized air from a space formed between each two adjacent bottom plates. Pressurized air to slide industrial waste on multiple bottom plates without clogging Industrial waste poured chute of the processing furnace characterized by comprising is configured to include a sheet means. 3. The industrial waste charging chute according to claim 2, wherein the processing furnace is rotatably arranged in a slightly inclined state and is rotatable with a refractory lining inside. A partition provided at a predetermined position in the cylinder so as to form an opening, and dividing the cylinder into a first chamber located relatively below and a second chamber located relatively above; A burner of a long frame provided at the end of the first chamber side toward the opening of the partition and so that the flame reaches the partition, and in the vicinity of the opening of the partition of the cylindrical body on the second chamber side. And an air supply device for supplying combustion air into the second chamber, wherein the chute for introducing industrial waste into a processing furnace is provided. 4. The chute for charging industrial waste of a processing furnace according to claim 2 or 3, wherein the partition is spirally provided around the inside of the cylinder at a position of 5 to 15 m from the discharge side end of the processing furnace. The pressurized air blows the industrial waste falling on the bottom plate from half the distance from the discharge end of the processing furnace to the partition to the position where the partition is provided. And a chute for charging industrial waste of a processing furnace, wherein the chute has an angle. 5. The industrial waste charging chute according to claim 1, wherein the industrial waste is a light-weight shredder dust containing an organochlorine compound, and after the water separation. A chute for charging industrial waste in a processing furnace, which is supplied after draining.