JP2000035280A - Dehydrating dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehydrating dryer for facilitating handling of dried slurry to improve workability, reduce the maintenance frequency, and improve energy saving performance. SOLUTION: Moisture of slurry is discharged from small holes and dehydrated by the rotation of a drum screen 2 with dehydration small holes drilled on the peripheral surface thereof, the dehydrated slurry dries and solidifies an attachment layer 4 attached to the inner peripheral surface of the drum screen 2 by means of a heating means 5 and a blowing means 6. Then, by utilizing a change in the magnitude of centrifugal force caused by the number of revolutions of the drum screen 2 or a change in heating temperature by heating means 5, protruding bodies 20 and 30 are provided for parting through the attachment layer 4 to be divided into pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrating and drying apparatus for separating a solid from a slurry for drying.

[0002]

2. Description of the Related Art Conventionally, a slurry dehydrating and drying apparatus has been used.
For example, one described in JP-A-6-281325 is known. The dehydration and drying device described in this publication is
A housing that covers the periphery of the functional unit to form an outer shell, a centrifugal separation drum housed in the housing, a scraping device that scrapes dry solids, and a mixing tool that agitates the scraped dry material. And a heating unit for heating the bottom of the centrifugal separation drum.

[0003] When a slurry containing granular powder to be dried is put into a centrifugal separation drum, the rotation of the centrifugal separation drum is started, and the slurry is substantially cylindrically moved on the inner wall surface of the centrifugal separation drum by centrifugal force. And a ring-shaped adhesion layer is formed. The liquid contained in the slurry flows out of the centrifuge drum from the screen. Increase the rotation speed to the maximum,
When the outflow of the liquid due to the centrifugal separation has been reduced to a negligible level, the rotation speed of the centrifugal separation drum is reduced to a low speed and the scraping device is operated. The scraping device is inserted into the semi-dry solids, scrapes off the solids from the inner wall of the centrifuge drum and drops it on the bottom plate of the centrifuge drum to complete the first drying step.

[0004] Subsequently, a second drying step comprises rotating the scraping device and the mixing tool back and forth continuously or intermittently by rotating the centrifugal drum forward or reverse to sweep the bottom plate of the centrifugal drum. Done in The inversion of the centrifugal separation drum and the operation of the scraping device and the mixing tool are all adjusted so that the layers of the solid matter in the centrifugal separation drum are sufficiently stirred.

In such a conventional dehydrating and drying apparatus, a heating section is provided at the bottom of the centrifugal separation drum, and all the solids are repeatedly brought into contact with the heating section while performing each operation for stirring. The remaining liquid is quickly evaporated. The solid matter sufficiently dried in this way can be transported by pneumatic transportation by suction or a transportation means such as a mechanical conveyor.
It is unloaded from the centrifuge drum.

However, in the conventional dehydrating and drying apparatus,
After the centrifugal dehydration, the solids are scraped off to the heating section in order to dry, so that a mechanical scraping device is required. Also,
A stirring mechanism such as a mechanical mixing tool is required to bring the solids scraped off by the bottom plate of the centrifugal separation drum into a piled state into contact with the heating unit. Therefore, one problem is an increase in cost due to the provision of such a scraping device and a stirring mechanism.

Further, since the centrifugal separation drum is rotated at a high speed during the centrifugal separation, fine solids are likely to be clogged in the screen portion. Then, it is difficult to eliminate the clogging only by the scraping device, and maintenance for preventing the clogging is indispensable in the conventional dehydrating and drying device. Therefore, the effect of such maintenance on running costs cannot be ignored. Further, since the dried solids are formed in non-uniform granules, it is necessary to take out the dried solids by pneumatic transportation or mechanical transportation as described above, which is disadvantageous in terms of cost.

Therefore, as an improvement on this problem,
The present inventors have proposed the following dehydration / drying apparatus. Hereinafter, a kitchen waste treatment apparatus using the dehydrating and drying apparatus will be described in detail with reference to the drawings.

FIG. 12 is an overall configuration diagram of a conventional dehydrating and drying apparatus. The slurry introduced into the dehydration / drying apparatus main body is a crushed garbage obtained by crushing garbage with a crusher such as a disposer provided in the garbage processing apparatus. However, it is not limited to crushed kitchen waste, and all liquids including solids are subject to handling.

Referring to FIG. 12, a cylindrical drum screen 2 for centrifugally dewatering a fed slurry is rotatably disposed inside a dehydration / drying apparatus main body 1. The drum screen 2 has a number of small holes formed on its peripheral surface, such as a punching metal, and an opening 1 at the bottom.
1 is provided. The opening 11 is formed to have an inner diameter larger than the outer diameter of the shrunk dried shrinkable material and smaller than the inner diameter of the inner wall surface of the drum screen 2. The diameter of the opening 11 can be made variable. A discharge port 12 is provided at the lower end of the portion enclosing the entire drum screen 2, and the slurry
And centrifugal dehydration of water and drum screen 2 during drying
The water vapor inside is discharged from the discharge port 12 to the outside.

The drum screen 2 is connected to a drive unit 3 using a motor or the like by a drive transmission mechanism such as a gear train or a V-belt. At the time of rotation, the semi-dry solid after centrifugally dewatering the slurry is formed on the inner peripheral surface. Is deposited.
Due to the centrifugal force of the drum screen 2, the adhesion layer 4 adheres to the inner wall surface of the drum screen 2 with a substantially uniform thickness, and a dehydration detection unit 100 provided downstream from the discharge port 12.
Thus, the formation of the adhesion layer 4 is detected.

On the other hand, a heating section 5 as a heat source for drying the adhesion layer 4 and a blowing means 6 such as a fan are incorporated in a portion opposite to the discharge port 12, and the heat generated in the heating section 5 is It is supplied by means 6 to the adhesion layer 4 in the drum screen 2. Also, the slurry is applied to the drum screen 2
An introduction portion 8 for introducing the inside of the drum screen 2 is arranged on the inner wall surface of the drum screen 2 with its opening end facing. Furthermore,
An adjusting means 10 for adjusting the inflow of the slurry is arranged on the upstream side of the introduction section 8, and a control section 9 for controlling the adjusting means and the driving section 3 is provided. Then, a full detecting means 101 for detecting an inflow amount of the slurry is provided, and a detection signal when the inflow amount reaches a predetermined amount is input to the control unit 9.

The operation of such a conventional dehydrating and drying apparatus is as follows. The slurry guided from the introduction unit 8 onto the inner wall surface of the drum screen 2 receives a centrifugal force due to the rotation of the drum screen 2 by the driving unit 3, and does not fall directly downward (in the direction of gravity) from the opening 11. It flows along the inner peripheral surface of the drum screen 2 to form a cylindrical adhesion layer 4. Here, the fullness detecting means 101 detects the amount of inflow of the slurry and sends a detection signal to the control section 8, and the control section 9 controls the adjusting means 10 so that the adhesion layer 4 having an appropriate thickness is formed in the drum screen 2. The amount of the slurry is set to a predetermined amount or less so that is formed.

The liquid contained in the slurry under the influence of the centrifugal force is discharged out of the drum screen 2 through small holes formed in the drum screen 2 in a large number on the side surface, passes through the discharge port 12 and passes through the dewatering / drying apparatus main body 1. It is discharged outside.

The rotational speed at which the drum screen 2 is rotated must be higher than a predetermined rotational speed at which the solids contained in the slurry can form a substantially uniform adhesion layer 4 on the inner wall surface of the drum screen 2. Must. However, if the rotation speed is too high, the centrifugal force becomes too high, and the adhesive layer 4 is released to the outside. Therefore, the rotation speed must be lower than the upper limit rotation speed. That is, the rotation speed of the drum screen 2 has an upper limit and a lower limit.

The drum screen 2 is rotated at such a predetermined rotation speed between the upper limit and the lower limit until the liquid discharged from the many small holes has a negligible flow rate. When this state is detected by the dehydration detecting means 100, a cylindrical adhesion layer 4 having a substantially uniform thickness and height is formed on the inner wall surface of the drum screen 2.
As the dehydration detecting means 100, it is preferable to use an ultrasonic sensor or the like for actually measuring and detecting the formation of the adhesion layer 4 by means of an ultrasonic wave or the like. And a timer, etc., and adjusting means 1
The rotation time of the drum screen 2 corresponding to the amount of slurry adjusted by 0 is calculated by the control unit 9 (or one rotation time is selected from a rotation time table stored in advance), and this time is measured by a timer or the like. Thus, the dehydration detecting means 100 can be easily configured.

When the dehydration detecting means 100 detects that the dehydration has been completed, the control unit 9 reduces the rotation speed of the drum screen 2 to a low rotation speed, and operates the heating unit 5 and the blowing means 6. The heating section 5 raises the temperature of the drum screen 2 and the adhesion layer 4 to a predetermined temperature and maintains the temperature, and the blowing means 6 uses the heat of the heating section 5 to dry the drum screen 2 and the adhesion layer 4. Let it.

By the way, after the drying by the heating is started, the moisture contained in the adhesion layer 4 starts to evaporate, so that the adhesion layer 4 gradually shrinks, and depending on the properties of the slurry, approximately 1% to 10%. The diameter shrinks. Here, since the inner wall surface of the drum screen 2 is formed of a material having a large contact angle with water, the adhesive layer 4 is easily separated from the inner wall surface of the drum screen 2 when dried. When the slurry is a crushed garbage, the water content of the adhesion layer 4 is set to 1 for safety.
It is desirable to set it to 0% or less. After a lapse of a predetermined time, the adhesion layer 4 becomes a small piece of dried shrinkage, falls through the opening 11, and can be easily discharged from the drum screen 2. The discharged dried shrinkage may be stored in an accumulation tank (not shown) and then disposed of.

[0019]

However, in the conventional dehydrating and drying apparatus, the slurry charged in the drum screen 2 is dried and solidified before the drum screen 2 is dried.
Is recovered as a cylindrical dried product along the inner peripheral surface of the Therefore, since the collected dried product is handled in a cylindrical shape, it is difficult to handle in a disposal process or the like, and there is a limit to improvement in workability and processing efficiency.

The problem to be solved in the present invention is to provide a dehydrating and drying apparatus which facilitates handling of a dried slurry to improve workability, reduces maintenance frequency and improves energy saving.

[0021]

SUMMARY OF THE INVENTION The present invention provides a drum screen having a large number of small holes for dewatering on its peripheral surface and an open bottom, a driving unit for rotating the drum screen around its axis, and a slurry. A heating unit for evaporating water contained in the drum screen; and a control unit for controlling the heating unit and the heating unit. The slurry introduced to the drum screen is attached to the inner peripheral surface of the drum screen by centrifugal force and centrifuged. A dewatering / drying device for dewatering, characterized in that a cutting means for cutting an adhered layer adhered to the inner peripheral surface of the drum screen after centrifugal dewatering is provided.

According to such a configuration, the slurry can be centrifugally dehydrated and dried and solidified, for example, and then cut by the cutting means so as to separate the adhered layer into a plurality of pieces. Maintenance frequency can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An invention according to claim 1 is a drum screen having a large number of small holes for dewatering on its peripheral surface and an open bottom, and a drive unit for rotating the drum screen around its axis. A heating unit for evaporating water contained in the slurry; and a control unit for controlling the driving unit and the heating unit. The slurry introduced into the drum screen adheres to the inner peripheral surface of the drum screen by centrifugal force. A spin-drying device for centrifugally dewatering, wherein the spin-drying device is provided with cutting means for cutting the adhering layer adhering to the inner peripheral surface of the drum screen after centrifugal spin-drying. The slurry that has been cut and dried by centrifugal dehydration and heating is produced as a small dried product, which is divided, thereby improving the handleability. In addition, since drying is performed in a divided state, drying efficiency is improved, and energy saving can be achieved.

According to a second aspect of the present invention, the cutting means retracts outside the inner peripheral surface of the drum screen by centrifugal force when the drum screen rotates at a predetermined rotation speed or more,
2. The dewatering / drying apparatus according to claim 1, wherein the projection is a projection that protrudes from the inner peripheral surface of the drum screen toward the center at the predetermined rotation number or less and separates the adhesion layer. Since the adhesive layer is cut using the centrifugal force of the above, there is no need to provide a separate driving means or the like.

According to a third aspect of the present invention, the control unit includes:
3. The driving unit is controlled to rotate the drum screen at a speed equal to or higher than the predetermined rotation speed during centrifugal spin-drying, and to reduce the speed below the predetermined speed after spin-drying.
Since the dehydration / drying device is described, the number of rotations of the drum screen is controlled, so that the adhered layer can be reliably cut after dehydration.

According to a fourth aspect of the present invention, the cutting means is characterized in that the drum screen becomes flat along the inner peripheral surface of the drum screen when the temperature is lower than a predetermined temperature, and the inner peripheral surface of the drum screen when the temperature is higher than the predetermined temperature. The dehydration / drying apparatus according to claim 1, which is a protrusion made of a shape memory alloy that protrudes from and separates the adhesion layer, in order to cut the adhesion layer using heating during drying,
There is no need to separately provide a driving means or the like.

According to a fifth aspect of the present invention, the control unit includes:
During the centrifugal dehydration, the drum screen is kept at the predetermined temperature or lower, and after the centrifugal dehydration, the heating unit is controlled so as to raise the temperature to the predetermined temperature or higher. Since the temperature of the drum screen is controlled, the adhered layer can be reliably cut after the slurry is dehydrated.

According to a sixth aspect of the present invention, the contact angle between at least the inner peripheral surface of the drum screen and the surface of the protruding body with water is 70 degrees or more. Since the dewatering and drying apparatus according to any one of the above, the dried material does not adhere to the inside of the drum screen, so that maintenance can be reduced. In addition, the releasability of the dried material from the drum screen is improved, and stable processing can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is an overall configuration diagram of a dehydrating / drying apparatus according to Embodiment 1 of the present invention, and FIG.
3 is an enlarged view of a portion V in FIG. 2, FIG. 4 is a cross-sectional view along a line AA in FIG. 1 at the time of drying, and FIG. 5 is a portion W in FIG. FIG. 6 is an explanatory view of a contact angle according to the first embodiment of the present invention.

In FIG. 1, the constructions of the dehydrating and drying apparatus main body 1 and the drum screen 2 are the same as those shown in FIG. 12, and the same components are designated by the same reference numerals, and detailed description thereof will be omitted. .

A projecting body 20 is provided around the drum screen 2 at a position penetrating the small hole, and the projecting body 20
Weight 21 fixed to one end of the drum screen 2 and the drum screen 2
And a biasing body 22 interposed between the outer peripheral surface of the body and the heavy object 21. As shown in FIG. 2, a plurality of the protruding members 20 are arranged at equal intervals in the circumferential direction of the drum screen 2, and the urging member 22 uses, for example, a tension spring.

The weight 21 is moved through the urging member 22.
When the drum screen 2 is rotated at a high speed at a predetermined rotation speed or more, the protruding body 20 is formed by the centrifugal force of the heavy object 21 so that the protrusions 20 on the peripheral surface of the drum screen 2 are closed, as shown in FIGS. The tip is located inside and the deposit 4
In a position that does not interfere with Further, when the drum screen 2 rotates at a predetermined rotation or less, the acting centrifugal force becomes small, and therefore, as shown in FIG. 4 and FIG. .

The size of the small holes on the peripheral surface of the drum screen 2 may be such that the solid component of the slurry hardly passes. For example, when the slurry is a crushed garbage, the diameter of the small holes is small. If it is about 1 mm, about 80% or more of the crushed garbage can be collected. Drum screen 2
The inner wall surface and the protruding body 20 are optimally formed or coated with a material having a large contact angle with water.
It is preferable that the degree is higher than the degree. This contact angle is shown in FIG.
As shown in Fig. 5, the angle between the droplet and the solid plane when the droplet is rested on a horizontal solid. In general, the property that a solid repels water, that is, “water repellency” is evaluated by the magnitude of the contact angle. Therefore, a material having high water repellency may be used.

The operation of the dehydrating and drying apparatus according to the first embodiment is as follows. After the drum screen 2 is rotated at a predetermined number of revolutions and the protrusions 20 are drawn into the small holes of the drum screen 2 by the centrifugal force of the heavy load 21 as shown in FIGS. It is guided on the inner wall surface of the drum screen 2. The inflowing slurry receives centrifugal force due to the rotation of the drum screen 2, does not fall directly downward (in the direction of gravity) from the opening 11, flows on the side surface of the drum screen 2, and has a cylindrical shape on the inner wall surface of the drum screen 2. An adhesion layer 4 is formed in a shape. Here, it is preferable that the amount of the slurry flowing in is set to a predetermined amount or less. If the amount is too large, the slurry may be discharged from the rotating drum screen 2 to the outside. Therefore, when the inflow amount of the slurry reaches the predetermined amount, the fullness detecting means 10
When 1 is detected, the detection signal is sent to the control section 9, and the control section 9 controls the adjusting means 10 to keep the amount of slurry at a predetermined amount. It should be noted that a slurry such as a crushed garbage product crushed by a crusher can be effectively subjected to the drying treatment by the dehydrating and drying apparatus of the present invention, and is most suitable as an object to be treated.

When the driving unit 3 rotates the drum screen 2, the liquid contained in the slurry is discharged to the outside of the drum screen 2 through small holes formed in the side surface of the drum screen 2 due to centrifugal force generated inside the drum screen 2. And
It is discharged to the outside of the dehydration / drying device main body 1 via the discharge port 12.

Here, the predetermined rotation speed N (rpm) at which the drum screen 2 is rotated is set to be higher than the rotation speed at which the solid matter contained in the slurry can form a substantially uniform adhesion layer 4 on the inner wall surface of the drum screen 2. There must be. However, if the rotation speed is too high, the centrifugal force becomes too strong and a part of the adhesion layer 4 is released to the outside. Therefore, the rotation speed must be at least lower than the upper limit rotation speed. That is, the rotation speed N (rpm) of the drum screen 2
Has an upper limit and a lower limit. This rotation speed N (rpm)
Is, when the radius of the drum screen 2 is r (m),
200 / r ^1/2 <N <12
The rotation speed falls within a range that satisfies 00 / r1 / ² . 20
At 0 / r ^1/2 or less, the adhesion layer 4 cannot be formed well,
If it is more than 00 / r1 / ^{2, the} amount of solid components mixed into the wastewater and passing through the small holes will increase, which is not appropriate.

The drum screen 2 is rotated at such a predetermined number of revolutions until the liquid discharged from the many small holes has a negligible flow rate. Then, when the dehydration detecting means 100 detects that the dehydration of the adhesion layer 4 is almost completed, a state is formed in which the cylindrical adhesion layer 4 having a substantially uniform thickness and height is formed on the inner wall surface of the drum screen 2. I have.

It should be noted that the dehydration detecting means 100 uses the adhesion layer 4
It is preferable that the thickness and height are measured and detected by means of an ultrasonic sensor or the like, but a drum screen corresponding to the amount of slurry adjusted by the adjusting means 10 is used instead of the actual measurement. 2 is calculated by the control unit 9 (or one rotation time is selected from a rotation time table stored in advance), and this time is measured by a timer, so that the control unit 9 and the timer can easily perform dehydration. The detecting means 100 can also be configured.

When dehydration is detected by the dehydration detecting means 100, the control unit 9 reduces the rotation speed of the drum screen 2 to a low rotation speed that is equal to or lower than a predetermined rotation speed. At this time, as shown in FIG. 4 and FIG.
With the urging force of 2, the drum screen 2 moves to a position protruding toward the center from the inner wall surface. Due to such movement of the protruding body 20, the adhesive layer 4 having an annular cross section is cut and divided by the protruding body 20, as shown in FIG. 4, and a small-piece-shaped adhesive layer 4 having a substantially uniform thickness and height is formed. Is done.

Next, the heating section 5 and the blowing means 6 are operated to raise the temperature of the adhesion layer 4 and the drum screen 2 to about 150 ° C. and maintain the temperature, and the blowing means 6 reduces the heat of the heating section 5. The adhesive layer 4 is supplied to the drum screen 2 and the adhesive layer 4 to be dried.

When drying is started by heating by the heating unit 5, the moisture contained in the adhesion layer 4 starts to evaporate, and the adhesion layer 4 starts to contract. Here, since the inner wall surface of the drum screen 2 is formed or coated with a material having a large contact angle with water, the adhesion layer 4 can be easily separated from the inner surface of the drum screen 2. When a predetermined amount of time has elapsed and the amount of water contained in the adhesion layer 4 has decreased and becomes equal to or less than the predetermined amount, the heating unit 5 and the blowing unit 6 stop operating. In addition,
When performing the continuous processing, it is also possible to continue the processing without stopping the operations of the heating unit 5 and the blowing unit 6.

Here, when the slurry is a crushed garbage,
From the viewpoint of safety, it is desirable that the water content of the adhesion layer 4 be 10% or less. After a lapse of a predetermined time, the adhesive layer 4 becomes a dried and shrunk product that has shrunk in a divided state, falls through the opening 11, and can be easily discharged from the drum screen 2.

(Embodiment 2) FIG. 7 is an overall configuration diagram of a dehydrating / drying apparatus according to Embodiment 2 of the present invention, FIG. 8 is a cross-sectional view taken along the line BB of FIG. 7 during dehydration, and FIG. 8 is an enlarged view of an X part, FIG. 10 is a cross-sectional view taken along the line BB of FIG. 7 at the time of drying, and FIG. 11 is an enlarged view of a Y part of FIG. Note that the same components as those described in the previous example and the prior art are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, on the inner peripheral surface of the drum screen 2, projections 30 made of a shape memory alloy are arranged at regular intervals in the circumferential direction. This protrusion 30 is shown in FIG.
As shown in FIG. 11, both ends of the drum screen 2 in the circumferential direction are restrained by a holding member 31 so as to be slidable in the circumferential direction. The protruding body 30 has a flat cross-sectional shape along the inner peripheral surface of the drum screen 2 as shown in FIG. 9 below a predetermined temperature, and as shown in FIG. Deforms into a shape protruding from the surface toward the center.

By the way, the size of the small holes on the peripheral surface of the drum screen 2 may be about 1 mm in diameter when the slurry is crushed garbage as in the first embodiment. Further, the inner peripheral surface of the drum screen 2 and the projecting body 30
Most preferably, the material is formed or coated with a material having a large contact angle with water, and particularly preferably a material having a contact angle of 100 degrees or more, such as a fluorine coating.

In the above configuration, similarly to the example of the first embodiment, the drum screen 2 is rotated at a predetermined number of revolutions, and the slurry is guided on the inner peripheral surface of the drum screen 2 by the introduction unit 8. At this time, the drum screen 2 is not heated and has a temperature equal to or lower than a predetermined temperature which will be described later, so that the protrusion 30 is flat along the inner peripheral surface of the drum screen 2.

The incoming slurry receives centrifugal force as the drum screen 2 rotates, and
A cylindrical adhesion layer 4 is formed on the inner peripheral surface of the substrate. Then, due to the centrifugal force generated in the drum screen 2, the liquid contained in the slurry is discharged out of the drum screen 2 from a small hole formed in the peripheral wall of the drum screen 2, and discharged through the discharge port 12.

Here, as in the case of the first embodiment, when dehydration is detected by the dehydration detecting means 100, the control unit 9 reduces the rotation speed of the drum screen 2 to a low rotation speed, and the heating unit 5 And the blowing means 6 are operated. Heating unit 5
Raises the temperature of the adhesion layer 4 and the drum screen 2 to about 150 ° C. and maintains the temperature, and the blowing means 6 supplies the heat of the heating unit 5 to the drum screen 2 and the adhesion layer 4 to remove the adhesion layer 4. dry.

Drying is started by heating by the heating unit 5,
When the temperature of the drum screen 2 becomes equal to or higher than a predetermined temperature, as shown in FIGS. 10 and 11, the protruding body 30 formed of a shape memory alloy is deformed by heat and protrudes from the inner peripheral surface of the drum screen 2 toward the center side in a wedge shape. Deform to. Due to such deformation of the protruding body 30, the adhesive layer 4 is cut and separated, and the small-sized adhesive layer 4 having a substantially uniform thickness and height is formed on the drum screen 2.
Remains on the inner circumference. The predetermined temperature at which the protruding body 30 is deformed is desirably about 60 ° C. to 100 ° C. If the temperature is lower than 60 ° C., the temperature of the drum screen 2 may rise to that temperature at a high temperature in summer. If the temperature is higher than 100 ° C., the adhesive layer 4 is dried and becomes difficult to cut.

When the heating by the heating unit 5 is continued, the moisture contained in the adhesion layer 4 starts to evaporate, and the adhesion layer 4 itself starts to contract. Since the inner peripheral surface of the drum screen 2 is formed or coated with a material having a large contact angle with water, the adhesion layer 4 can be easily peeled off from the inner surface of the drum screen 2. Then, when a predetermined amount of time has elapsed and the amount of water contained in the adhesion layer 4 has decreased to become equal to or less than the predetermined amount, the heating unit 5 and the blowing unit 6 stop operating.
When performing the continuous processing, it is also possible to continue the processing without stopping the operations of the heating unit 5 and the blowing unit 6. Here, when the slurry is a crushed garbage, it is desirable that the moisture content of the adhesion layer 4 be 10% or less for safety.
When a predetermined time has elapsed, the adhesive layer 4 becomes a shrunk dry shrinkage product in a divided state, falls from the opening 11, and
It can be easily discharged from the drum screen 2.

[0051]

According to the present invention, the adhesive layer on the inner surface of the drum screen is centrifugally dewatered and then cut by the cutting means, so that the dried slurry can be reduced into small pieces, and the slurry is recovered in a cylindrical shape as in the prior art. Handling is easier than work, and workability and processing efficiency are improved.

If the adhesive layer is divided and dried by the cutting means, the efficiency in the drying step can be improved, and energy can be saved.

Furthermore, when the contact angle between the drum screen and the water on the surface of the protrusion is set to 70 ° or more to increase the water repellency, the maintenance of the slurry can be reduced without sticking of the slurry, and the stable treatment can be performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a dehydration / drying apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 during dehydration;

FIG. 3 is an enlarged view of a portion V in FIG. 2;

FIG. 4 is a cross-sectional view taken along line AA of FIG. 1 during drying.

FIG. 5 is an enlarged view of a portion W in FIG. 4;

FIG. 6 is an explanatory diagram of a contact angle according to the first embodiment of the present invention.

FIG. 7 is an overall configuration diagram of a dehydration / drying apparatus according to Embodiment 2 of the present invention.

FIG. 8 is a cross-sectional view taken along the line BB of FIG. 7 during dehydration;

9 is an enlarged view of a part X in FIG. 8;

FIG. 10 is a cross-sectional view taken along the line BB of FIG. 7 during drying.

11 is an enlarged view of a portion Y in FIG.

FIG. 12 is an overall configuration diagram of a conventional dehydration / drying apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydration drying apparatus main body 2 Drum screen 3 Driving part 4 Adhesion layer 5 Heating part 6 Blowing means 8 Introducing part 9 Control part 10 Adjusting means 11 Opening 12 Outlet 20 Projection body 21 Heavy object 22 Energizing body 30 Projection body 31 Holding plate 100 Dehydration detecting means 101 Full detecting means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F26B 5/08 F26B 5/08 // B01D 33/06 B01D 33/06 Z F term (Reference) 3L113 AA06 AB08 AC01 AC45 AC46 AC52 AC57 AC63 AC68 AC74 AC76 AC78 BA01 BA36 CA02 CA06 CA08 CA15 CB01 CB24 CB28 CB34 DA02 DA05 DA07 DA22 4D026 BA01 BB08 BC24 BC26 BC30 BD01 BD06 BE01 BE07 BE11 BF11 BF14 BF19 BF20 B21A01B01 B01 B01 B01 B01 B01 B01 B01A01 AE03 AF01 BA13 BA17 BA33 BA40 BA43 BC05 BC11 CA02 CA07 CB00 CB01 CB04

Claims (6)

[Claims] 1. A drum screen having a large number of small holes for dewatering on its peripheral surface and an open bottom, a driving unit for rotating the drum screen around its axis, and a heating unit for evaporating water contained in the slurry. And a controller for controlling the driving unit and the heating unit, wherein the slurry introduced into the drum screen is adhered to the inner peripheral surface of the drum screen by centrifugal force to perform centrifugal dehydration and drying. A dewatering / drying apparatus, further comprising cutting means for cutting the adhering layer adhering to the inner peripheral surface of the drum screen after centrifugal dehydration. 2. The cutting means retreats from the inner peripheral surface of the drum screen outside the inner peripheral surface of the drum screen by centrifugal force when the rotational speed of the drum screen is equal to or higher than a predetermined rotational speed. 2. A projection which projects toward the center and divides the adhesion layer.
The dehydration / drying apparatus as described in the above. 3. The control unit controls the drive unit to rotate the drum screen at a speed equal to or higher than the predetermined rotation speed during centrifugal dehydration, and to reduce the speed to less than the predetermined rotation speed after spin-drying. The dehydration drying device according to claim 2. 4. The cutting means, wherein the drum screen is flat along the inner peripheral surface of the drum screen when the temperature is lower than a predetermined temperature, and protrudes from the inner peripheral surface of the drum screen when the temperature is higher than the predetermined temperature. 2. The dehydrating / drying apparatus according to claim 1, wherein the protruding body is made of a shape memory alloy that is divided. 5. The control section controls the heating section to keep the drum screen below the predetermined temperature during centrifugal dehydration and to raise the temperature above the predetermined temperature after centrifugal dehydration. 5. The dehydrating and drying apparatus according to 4. 6. A contact angle between each of at least the inner peripheral surface of the drum screen and the surface of the protruding body with water is 70.
The dehydration drying apparatus according to any one of claims 2 to 5, wherein the drying degree is not less than a degree.