JP2002303487A - Structure for stirring/transporting matter to be treated in rotary drum type dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a novel structure for stirring/transporting a material to be treated in a rotary drum type dryer in which low quality refuse having a high moisture content can be reformed and drying efficiency of low quality refuse can be enhanced. SOLUTION: In the rotary drum type dryer, a matter to be treated supplied from the throw-in opening 20 of a rotary drum 2 is stirred by rotating the rotary drum 2 and blades 32 provided on a rotary shaft 30 disposed in the rotary drum 2, and dried by touching hot air. Then the dried matter is discharged sequentially from a discharge opening 21, spiral blades 31 are formed on the rotary shaft 30, and the matter to be treated having a lowered moisture content is mixed with a matter to be treated just thrown in by transporting the matter to be treated having a lowered moisture content to the throw-in opening 20 side by means of the spiral blades 31, thus lowering the moisture content of the matter to be treated located in the vicinity of the throw-in opening 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer used for pre-treatment of municipal waste in an RDF manufacturing facility, a municipal waste gasification and melting facility, and the like. In particular, a low-quality waste having a high water content is effectively modified in the dryer. The present invention relates to a stirring and transferring structure capable of improving the drying efficiency.

[0002]

2. Description of the Related Art Recently, household waste, industrial waste and the like discharged in cities are dried and reused as solid fuel for RDF power generation and the like. A rotary drum type dryer is used as a dryer used at that time. The rotary drum type dryer is provided with a rotating shaft passing through both openings in a cylindrical rotating drum that is rotatably provided sideways, and is further provided with a rotating shaft. The shaft is provided with a blade.
A lifter is provided on the inner surface of the rotary drum, and the garbage and the lifter are configured to stir and disperse municipal dust.

[0003] Using such a rotary drum type dryer,
In particular, a water content of 60 to 70% W. When drying city garbage B and above, this low-quality garbage is dispersible,
Since the fluidity is low, there has been a problem that the contact between the low-quality refuse and the hot air is not properly performed and the drying efficiency is reduced. As a countermeasure for this, increasing the rotation speed of the stirring blade provided for the purpose of stirring the object to be processed is also performed, but since string-like dust is likely to be entangled with the rotation shaft, it is limited. And the effect was not enough.

[0004] Therefore, it is necessary to improve the water content by lowering the processed material (retained garbage), which has been dried in the rotating drum and has a reduced water content, by mixing it with the low-quality garbage just added. Attempted. That is, the object to be treated (municipal waste) introduced into the dryer moves in the direction of the outlet as the drying proceeds, and the object to be treated (remaining dust) located on the outlet side is moved to the inlet side. To be transported. Specific techniques for this include:
The shape of the lifter is such that the object to be processed (retained garbage) is dropped toward the inlet, or the shape of the blade is such that the object to be processed (remaining garbage) is thrown toward the inlet. Was to be done. However, according to the lifter, the processing target (remaining refuse) having a high moisture content located in the lower layer portion is returned, and the reforming efficiency of low-quality refuse decreases. Further, according to the above-mentioned blades, the object to be treated (retained garbage) thrown toward the input port side is pushed back to the discharge port side by the hot air supplied from the input port side, so that low-quality refuse is improved. Quality efficiency is reduced. For this reason, further improvement in reforming efficiency has been desired.

[0005]

[Technical Problems Attempted to Be Developed] The present invention has been made in view of such a background, and is capable of efficiently reforming low-quality refuse having a high water content in a dryer, and Is an attempt to develop a novel rotary drum type dryer capable of improving the drying efficiency of low-quality refuse by stirring and transferring an object to be processed.

[0006]

According to a first aspect of the present invention, there is provided a rotary drum type dryer in which an object to be processed supplied from an input port of the rotary drum is rotated by the rotary drum and a rotary shaft disposed in the rotary drum. Along with stirring by the rotation of the wing plate provided in, to achieve contact with hot air and dry,
In a rotary drum type dryer that sequentially discharges the dried workpieces from a discharge port, a spiral blade is formed on the rotating shaft, and the spiral blade promotes drying and reduces moisture content. By transferring the object to the inlet side, the object to be treated having a reduced water content is mixed with the object just to be introduced, thereby reducing the water content of the object to be located near the inlet. It is characterized by having been constituted so as to be able to do. According to the invention,
Even when low-quality refuse having a high moisture content is supplied into the rotating drum, it is reformed in the vicinity of the charging port and the moisture content is reduced, so that the dispersibility is improved. Efficiency is improved. In addition, it is possible to ensure a necessary and sufficient time for the object to be processed put in the rotating drum to stay in the drying drum, and drying is performed effectively. Furthermore, by the spiral blade formed on the rotating shaft,
It is possible to prevent a long dust that is less than the apparent spiral blade outer peripheral length from being entangled with the rotating shaft.

According to a second aspect of the present invention, in addition to the above requirements, in the rotary drum type dryer, the spiral blade has a height dimension of a screw thread shorter than a length dimension of the blade plate. Is characterized in that it is configured to be able to transfer only the surface layer portion of the object located on the inner peripheral surface of the object. According to the present invention, since only the low-moisture content staying refuse constituting the surface layer portion of the processing object located on the inner peripheral surface of the drum is transferred, the low-quality refuse near the charging port is effectively reformed. be able to. The above-mentioned problem is solved by using the requirements described in these claims.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rotary drum type dryer according to an embodiment of the present invention. Reference numeral 1 in the figure denotes a rotary drum type dryer, which is provided with a cylindrical rotary drum 2 which is rotatably provided horizontally, and which is rotatably provided in a longitudinal direction in the rotary drum 2. And a stirring / transfer mechanism 3 which is supported by an input-side machine frame F1, a discharge-side machine frame F2, and a support roller R. In the present specification, the direction of the rotary drum type dryer 1 is defined as follows, and the traveling direction of the municipal garbage D as a processing target, that is, the discharge port 21 side of the rotary drum 2 is defined as the front. , The opposite side, that is, the inlet 20 side is defined as the rear side. In the following description, it is assumed that the municipal garbage D to be processed by the rotary drum type dryer 1 stays between the inlet 20 and the outlet 21 in the rotary drum 2 and is dried. The thing is referred to as staying garbage D1.

Hereinafter, each member constituting the rotary drum type dryer 1 will be described. The rotary drum 2 is a cylindrical member, and is rotatably mounted on a support roller R provided on a base B. Then, open both sides of the opening 2
A and the discharge-side lid 2B are closed. The boundary between the input-side lid 2A, the discharge-side lid 2B, and the rotary drum 2 is sealed so that the rotary drum 2 can rotate. An inlet 20 and a hot air blow-in port 22 are formed in the inlet-side lid 2A, and an outlet 21 and an exhaust port 23 are formed in the outlet-side lid 2B. As shown in FIG. 2, a flat ring-shaped inlet weir 24 is provided in the portion of the rotary drum 2 on the side of the charging port 20.
An outlet weir 25 in the form of a flat plate is also provided at the portion on the discharge port 21 side. The inlet weir 24 and the outlet weir 25 are both for regulating the outflow amount of the object to be treated. In particular, the height dimension (difference between the outer diameter and the inner diameter) of the outlet weir 25 is set in the rotary drum 2. This determines the amount of staying garbage D1 that is located as an object to be processed.

As shown in FIG. 3, an angle-shaped lifter 26 is provided on the inner surface of the rotary drum 2 as an example.
Four are provided at intervals of 0 °. The height of the lifter 26 is, for example, 2/7 of the height of the outlet weir 25.
The upper part of the rotary drum 2 has a pointed shape and is inclined so as to expand from the center of the rotary drum 2 toward the inner peripheral surface.

A structure for rotating the rotary drum 2 will now be described. As shown in FIG. 1, the structure is such that a chain 27 is mounted on a gear provided near the center of the outer surface of the rotary drum 2 and slightly on the outer peripheral surface on the input side. And the rotary drum 2 is rotationally driven by a drive motor M1 provided on the base B.

Next, the stirring and transferring mechanism 3 will be described. As shown in FIGS.
And a blade plate 32 substantially perpendicular to the rotating shaft 30. The rotating shaft 30 is rotatably supported by bearings 33. The rotating shaft 30 is provided on the rotating drum 2.
And is arranged so as to penetrate in the longitudinal direction thereof. As an example, as shown in FIG.
Is located below a horizontal line passing through the center of the object and does not overlap with a vertical line passing through the center.

The spiral blade 31 is formed along the longitudinal direction with respect to the side peripheral surface of the rotary shaft 30 so that the spiral blade 31 advances from the front to the rear as the rotary shaft 30 rotates. It is formed. FIG. 4 shows the spiral blade 31 formed to have a right-handed screw shape, but may be formed to have a left-handed screw shape. The width of the spiral blade 31, that is, the height of the screw thread is set shorter than the length of the blade plate 32 as shown in FIG. 3, and is located on the inner peripheral surface of the rotary drum 2. Low moisture and light weight storage garbage D1 to be located in the surface of storage garbage D1
It is set to be able to transport only The pitch is set so as to become narrower from the front to the rear as an example, and corresponds to the mounting pitch of the blades 32.

The blades 32 are provided, for example, radially at intervals of 120 ° when viewed from the front, and the mounting pitch is set so as to become narrower from the front to the rear.

Here, the structure for driving the rotation shaft 30 will be described. As shown in FIGS.
The drive motor M2 is provided on the input side machine frame F1 mounted on the base B on the rear side of the drive motor M2 by winding the chain 35 around the sprocket 34 provided on the rotation shaft 30 and the output shaft of the motor M2. Is transmitted to the rotating shaft 30.

Further, there is provided a charging device 4 for supplying municipal dust D as a processing object into the rotary drum 2 on the charging machine frame F1. In this embodiment, as an example, a hopper and a screw conveyor are provided. And a combination of the above.

The structure for stirring and transferring the object to be processed in the rotary drum type dryer 1 of the present invention is configured as described above as an example, and its operation mode will be described below. First, the rotating drum 2 and the rotating shaft 30 are rotated in the counterclockwise direction in FIG.
Then, hot air is blown into the rotary drum 2 from above, and then the city refuse D is supplied into the rotary drum 2 from the input port 20 by the input device 4. Then, as shown in FIG. 5, the municipal garbage D (remaining garbage D1) is agitated by the blades 32 of the agitation and transfer mechanism 3 and scatters in the rotary drum 2 and contacts hot air to evaporate moisture and reduce the water content. Drop,
Further, a part of the garbage D1 is lifted by the lifter 26, and the garbage D1 advances toward the discharge port 21 while the stirring is promoted. Then, as shown in FIG. 6, the garbage D <b> 1 that has reached the outlet weir 25 gets over the waste and is discharged from the discharge port 21.

At this time, according to the present invention, the rotating shaft 30
Since the spiral blades 31 are formed, the spiral blades 31 transfer the accumulated garbage D1 having a reduced moisture content to the inlet 20 side due to the progress of drying, and the accumulated garbage D1 having the decreased moisture content. Is mixed with the newly-entered municipal garbage D, and the water content of the garbage D1 located near the charging port 20 can be reduced. That is, as shown in FIG. 6, the garbage D1 located on the inner peripheral surface of the rotary drum 2 has a higher moisture content in the lower layer due to a difference in specific gravity, whereas a garbage D1 having a lower moisture content is in the upper layer. Since the spiral blade 31 is located, the spiral blade 31 can transfer only the upper-layer garbage D1 to the inlet 20 side.

As described above, according to the present invention, even when low-quality refuse having a high water content is supplied into the rotary drum 2, the refuse is reformed in the vicinity of the charging port 20 and the water content is reduced. And the contact with hot air is suitably performed, and the drying efficiency is improved. In other words, the low-quality dust having a high moisture content tends to dry out only the surface layer in contact with the hot air in the rotary drum 2 and tends to dry, and the drying tends to be unbalanced. However, this can be avoided. Rotary drum 2
Some of the garbage D1 located inside the rotating drum 20
Circulates in the longitudinal direction, so that the residence time in the drying drum 2 is prolonged, and as a result, drying is performed effectively. Furthermore, by the spiral blade 31 formed on the rotating shaft 30,
Long garbage that is less than the apparent spiral blade circumference is the rotating shaft 3
It can be prevented from getting entangled with 0,
The operation of the rotary drum dryer 1 can be smoothly continued.

[0020]

According to the present invention, low-quality waste having a high moisture content can be reformed with high efficiency in the rotary drum type dryer 1, and the drying efficiency of low-quality waste can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a rotary drum type dryer of the present invention.

FIG. 2 is a front view and a rear view of the same.

FIG. 3 is a cross-sectional front view of the rotating drum.

FIG. 4 is a side view showing a stirring transfer mechanism.

FIG. 5 is a cross-sectional front view showing a state in which the garbage is stirred by the stirring transfer mechanism and the lifter.

FIG. 6 is a vertical sectional side view showing a state of stirring of the staying garbage by the stirring transfer mechanism and the lifter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary drum type dryer 2 Rotary drum 2A Input side lid 2B Discharge side lid 3 Stirring transfer mechanism 4 Inputting device 20 Input port 21 Discharge port 22 Hot air blowing port 23 Exhaust port 24 Inlet weir 25 Outlet weir 26 Lifter 27 Chain 30 Rotating shaft 31 Spiral blade 32 Blade plate 33 Bearing 34 Sprocket 35 Chain B Base D Municipal waste D1 Staying waste F1 Input side machine frame F2 Discharge side machine frame M1 Drive motor M2 Drive motor R Support roller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F26B 3/04 B09B 3/00 ZAB 25/04 303M F term (Reference) 3L113 AA06 AA07 AB02 AC01 AC40 AC42 AC45 AC46 AC58 AC63 AC68 BA01 CB22 CB29 CB34 DA04 DA07 DA11 4D004 AA02 AA46 AC04 BA03 CA42 CB09 CB28 CB36 CB44 CB45 DA02 DA09 4G036 AA13 AA15

Claims (2)

[Claims] An object to be processed supplied from an inlet of a rotary drum is agitated by rotation of a rotary drum and a blade provided on a rotary shaft provided in the rotary drum, thereby making contact with hot air. In a rotary drum type dryer that discharges an object to be processed after drying from a discharge port while drying while drying, a spiral blade is formed on the rotating shaft, and drying proceeds and moisture is contained by the spiral blade. By transferring the processed material having a reduced water content to the charging port side, the processed material having a reduced water content is mixed with the freshly charged material to be processed. A structure for transferring an object to be processed in a rotary drum type drier, wherein the structure is such that the water content can be reduced. 2. The spiral blade according to claim 1, wherein a height dimension of the screw thread is set shorter than a length dimension of the blade plate.
2. A structure for agitating and transferring an object to be processed in a rotary drum type drier according to claim 1, wherein only the surface portion of the object to be processed located on the inner peripheral surface of the rotary drum can be transferred.