KR101437908B1 - Vertical type screw dehydrator - Google Patents

Abstract

The present invention relates to a vertical type screw dehydrator, wherein the screw dehydrator is designed in vertical type, target sludge is compressed by a screw plate for compressing and is moved toward a upper part, which enables water to discharge via dehydration holes of the screw plate for dehydration formed on the upper part by using specific gravity of water and cohesion sludge, prevents the dehydration holes from clogging, easily concentrates and dehydrates the target sludge quickly.

Description

TECHNICAL FIELD [0001] The present invention relates to a vertical screw dehydrator using a specific gravity difference between water and agglomerated sludge,

The present invention relates to a vertical screw dehydrator for dewatering or concentrating sludge to be treated comprising water and agglomerated sludge and more particularly to a vertical screw- The present invention relates to a vertical screw-type dehydrator capable of smoothly concentrating and dewatering a sludge to be treated in a short period of time by allowing water to be discharged into a dehydrating hole of a dewatering screw plate formed thereon.

It is necessary to treat moisture-containing sludge generated in an industrial wastewater treatment facility, a wastewater treatment facility, and an environmental wastewater treatment facility such as a farm / livestock wastewater treatment facility. This is because the dehydration rate of the sludge, The sludge dewatering rate with respect to how much water is removed is very important. That is, the sludge disposal cost and the recycling range greatly vary depending on the degree of water contained in the sludge, so that the water content in the sludge is significantly reduced It is possible to reduce the disposal cost of disposing and treating the sludge as well as to be able to recycle the sludge solidification materials as fuel as well, which is very economical value added.

Generally, in order to treat the above-described sludge, the polymer flocculant is put into a reaction tank containing the water-containing sludge, and the sludge is reacted with the introduced polymer flocculant to remove the moisture by solid-liquid separation of the sludge. The dewatering efficiency of the sludge is lowered due to insufficient removal of water from the sludge only by using the coagulant.

Therefore, water contained in the sludge is removed using a device for increasing the dewatering efficiency of the sludge, that is, a dewatering device such as a centrifugal dehydrator, a belt press, a screw dehydrator, etc. In other words, the sludge agglomerated by the coagulant is dehydrated And the introduced sludge is squeezed by a centrifugal force or a roller in a dewatering device, or water is removed by a pressing movement of a screw or the like.

The centrifugal dehydrator is used for separating and dewatering water and solid substances having different specific gravity by using the centrifugal force of the rotating bowl after supplying sludge (agglomerated solidified sludge) into a bowl rotating at 2000 to 3000 rpm, The dehydrator has a high consumption of power for rotating the bowl at a high speed, vibration and noise caused by the rotating bowl are severely generated, and the centrifugal dehydrator is broken and malfunctioned, and maintenance and management of the centrifugal dehydrator It is difficult to remove the sludge from the sludge, and thus, there is a problem in that the dewatering efficiency of dewatering the sludge is lowered when the cost, time, and labor loss are large and the difference in specific gravity is small or the viscosity is high and the sludge is fine.

The belt press supplies sludge between two filter cloths (or a high-pressure belt or the like), passes through a plurality of rollers in a state in which sludge is wrapped by the two filter cloths while pressing force (or co- The belt press is difficult to adjust automatically in accordance with a change in the amount of sludge supplied or a change in the concentration of the sludge, and when the flocculant for flocculating the sludge is put in an excessive amount, When the dehydrated water in the sludge does not pass through the filter cloth due to the clogging phenomenon, the dewatering efficiency is lowered and if the clogging of the filter cloth occurs, washing of the filter cloth is not easy due to the high viscosity of the flocculant, The sludge and the washing water are not easily recovered even if they are washed, Depending on can be scattered to the outside of the bit around the press severe fouling by the sludge and the wash water in which the scattering of course there is a problem in that the odor has occurred.

The screw dehydrator injects moisture containing sludge into the dehydrator, rotates the screw, and moves the sludge to the opposite side of the sludge by moving the water while removing moisture from the sludge as well as discharging the moisture through the screen.

The dehydrator related to the present invention relates to a screw dehydrator.

As a conventional technique for a screw-type dehydrator, Korean Registered Utility Model No. 20-0232305 entitled " Dirt Dewatering Device by Wedge-shaped Wire Filtration Cylinder " and Domestic Registered Patent No. 10-1106168 " Screw Dehydrator "

The screw dehydrator of the prior art has a conical inner cylinder in a cylindrical outer cylinder, and a pressing screw plate is provided in a conical inner cylinder in order to pressurize the sludge.

On the other hand, since the dewatered liquid is discharged through the outer cylinder (or the wedge-shaped wire), the sludge being conveyed while being squeezed by the pressurizing screw plate requires a separate facility for receiving the dewatered liquid outside the outer cylinder.

That is, the screw dehydrator of the prior art requires not only the conical inner cylinder, the cylindrical outer cylinder but also a separate dehydrating liquid collecting device arranged to surround the cylindrical outer cylinder to receive the dehydrating liquid, .

Japanese Unexamined Patent Application Publication No. 2002-1589 discloses a horizontal pressurizing and dehydrator having an outer tube horizontally provided therein, an inner tube provided in the outer tube with the screw blades wound therein, a filtration liquid chamber formed inside the blade surface of the screw blade, and the like .

In addition, in the above-mentioned prior art, the screw blades are formed with a perforated member on both sides thereof, and the sludge to be treated is dewatered to both of the screw blades.

In the case of the conventional art, since the slurry is installed horizontally, the piercing member is gradually clogged due to not only moisture but also sludge, so that the piercing member, such as a scraper, is periodically cleaned .

Korean Registered Utility Model No. 20-0232305 'Dirt Dewatering Device by Wedge-type Wire Filtration Cylinder' (2001. 5.16. Registered) Korean Registered Patent No. 10-1106168 'Screw dehydrator' (registered on Jan. 9, 2012) Japanese Unexamined Patent Publication No. 2002-1589, " Continuous pressurizing and dehydrator " (published on January 18, 2002)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a sludge dewatering apparatus, a sludge dewatering apparatus, The dehydrator is vertically designed so that the sludge to be treated is conveyed to the upper part while being squeezed by the pressurizing screw plate so that water is discharged to the dewatering hole of the dewatering screw plate formed on the upper part thereof by using the difference in specific gravity between water and agglomerated sludge Which is capable of smoothly concentrating and dewatering the object sludge in a short period of time while preventing clogging of the dewatering hole.

According to an aspect of the present invention, there is provided a sludge discharge apparatus comprising: a cylindrical outer cylinder having a sludge inlet for introducing a sludge to be treated at a lower end thereof, a sludge outlet for discharging sludge dewatered at an upper end thereof, A conical inner cylinder rotatably disposed inside the cylindrical outer cylinder concentrically with an axial center of the cylindrical outer cylinder, the conical inner cylinder having a shape gradually increasing in diameter from a lower end to an upper end of the cylindrical outer cylinder; The radially outward end portion of the conical inner cylinder is maintained in a diameter corresponding to the inner diameter of the cylindrical outer cylinder and the radially inner end portion is fixed to the conical inner cylinder while being helically wound along the outer circumferential surface of the conical inner cylinder, And the radially outer side end portion of the pressing screw plate is spaced apart from the pressing screw plate in the downward direction and the radially outer side end portion of the pressing screw plate is spaced apart from the outer circumferential surface of the conical inner cylinder And a dewatering screw plate having a plurality of dewatering holes formed therein; A rotation driving member provided to rotationally drive the conical inner cylinder; Wherein the sludge to be treated is made of flocculated sludge having a specific gravity larger than that of water and water and water floating on the upper part of the flocculating sludge due to the difference in specific gravity between the water and the flocculating sludge, And a communicating hole is formed in the main surface of the conical inner cylinder so that the dehydrating solution flowing into the space between the pressing screw plate and the dewatering screw plate through the dewatering hole is introduced into the conical inner cylinder through the dewatering hole And a dewatering discharge path for discharging the dewatered liquid introduced into the conical inner cylinder to the outside of the cylindrical outer cylinder along the axial direction of the cylindrical outer cylinder is formed.

In the above, it is preferable that the pressing screw plate has a flat cross-sectional structure such that the radially outer end and the radially inner end of the pressing screw plate are at the same height.

In the above, the diameter of the dewatering hole is preferably 0.01 mm to 0.2 mm.

As described above, according to the present invention, the sludge is dewatered through the screw member without dewatering through the main surface of the cylindrical outer cylinder. Thus, the overall structure is simple and compact, the screw dehydrator is vertically designed, The water is discharged to the dewatering hole of the dewatering screw plate formed on the upper part thereof by using the difference in specific gravity between the water and the flocculating sludge as the water is conveyed to the upper part while being squeezed by the pressurizing screw plate, And to provide a vertical screw dehydrator capable of smoothly concentrating and dewatering sludge in a short time.

1 is a conceptual cross-sectional view of a vertical screw dehydrator according to an embodiment of the present invention;
2 is a front view of the screw member and the conical inner cylinder,
Fig. 3 is a bottom view of Fig. 2; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

FIG. 1 is a conceptual sectional view of a vertical screw dehydrator according to an embodiment of the present invention, FIG. 2 is a front view of a screw member and a conical inner cylinder, and FIG. 3 is a bottom view of FIG.

In this specification, the sludge to be treated refers to sludge to be dehydrated or concentrated, and the sludge to be treated is composed of water (water) and flocculated sludge having a specific gravity larger than that of water.

The aggregated sludge refers to the sludge aggregated by the flocculant. Generally, the specific gravity of the flocculated sludge is 1.5 to 2.5, so that the sludge to be treated can be classified into floating sludge at the upper part and flocculation sludge at the lower part.

The vertical screw-type dehydrator is designed in consideration of the fact that the sludge to be treated can be divided into the upper water and the lower flocculation sludge due to the difference in specific gravity.

The vertical screw-type dehydrator 100 includes a cylindrical outer cylinder 110, a conical inner cylinder 120, a screw member 130, a rotation driving member 140, and the like.

The cylindrical outer cylinder 110 is formed in a cylindrical shape erected in the vertical direction, specifically, a structure that is elongated in the axial direction.

The cylindrical outer cylinder 110 has a sludge inlet 111 through which a sludge to be treated flows into the lower end thereof and a sludge outlet 112 through which the sludge dewatered in the upper end flows out.

The cylindrical outer cylinder 110 has a watertight structure such that water inside can not be discharged to the outside except for the sludge inlet 111 and the sludge outlet 112.

A conical inner cylinder 120 is provided inside the cylindrical outer cylinder 110.

The conical inner cylinder 120 is disposed concentrically with the axial center of the cylindrical outer cylinder 110, that is, vertically arranged, and is rotatably provided inside the cylindrical outer cylinder 110. That is, the conical inner tube 120 is also vertically disposed and rotatable about a vertical axis.

The first support shaft 121 and the second support shaft 122 are provided at both ends of the conical inner tube 120 and the first support shaft 121 and the second support shaft 122 are connected to the cylindrical outer cylinder 110, And is supported by the bearing 123 passing through the center of the upper cover and the lower cover of the lower cover.

Also, the conical inner cylinder 120 has a hollow structure, and the diameter gradually increases from the lower end toward the upper end.

A rotation driving member 140 is provided outside the cylindrical outer cylinder 110 for driving the conical inner cylinder 120 to rotate.

The rotation driving member 140 includes a motor 141, a driving gear 142 connected to the driving shaft of the motor 141, and a driving gear 142 fixed to the first supporting shaft 121 of the conical inner cylinder 120, And a driven gear 143 that is gear-engaged with the driven gear 142, but this is only one example, and various modifications are possible.

The conical inner cylinder 120 is rotated inside the cylindrical outer cylinder 110 by the rotation driving member 140.

On the other hand, a screw member 130 is provided on the outer peripheral surface of the conical inner tube 120.

In this embodiment, the screw member 130 is helically wound along the outer circumferential surface of the conical inner tube 120, and is rotated together with the conical inner tube 120. The radially outer end of the screw member 130 also maintains the same diameter. That is, the radially outer end of the screw member 130 has a diameter corresponding to the inner diameter of the cylindrical outer cylinder 110 (preferably as closely as possible to the inner circumferential surface of the cylindrical outer cylinder 110).

The shape of the screw member 130 may be the same as that of the conventional screw extruder.

However, the screw member 130 of this embodiment has a structure in which the pressing screw plate 131 and the dewatering screw plate 132 are combined, and this structure is not disclosed in the prior art, (130) is rotated about a vertical axis.

Also, the screw member 130 of this embodiment has a vertically arranged structure in which the pressing screw plate 131 is located at the upper portion and the dewatering screw plate 132 is located at the lower portion. In such an arrangement structure, in the position of the sludge to be treated, the pressing screw plate 131 is disposed below the sludge to be treated and the dewatering screw plate 132 is disposed above the sludge to be treated.

The pressing screw plate 131 and the dewatering screw plate 132 are disposed to face each other and are vertically arranged. In addition, the pressing screw plate 131 is directed toward the sludge outlet 112 (that is, Or the sludge to be treated), and the dewatering screw plate 132 is disposed toward the sludge inlet 111 (that is, toward the lower side or on the upper side with respect to the sludge to be treated).

In addition, the screw member 130 has a structure in which both ends are clogged so that sludge does not flow into the screw member 130. Accordingly, the screw member 130 has a structure in which the dewatering liquid can flow into the dewatering hole 132a, which will be described later, and the sludge or water can not flow into other parts.

The pressurizing screw plate 131 is fixed to the outer circumferential surface of the conical inner tube 120 while the inner end in the radial direction is fixed to the upper surface of the sludge to be treated according to the rotation of the conical inner tube 120.

Therefore, a space for allowing sludge or water to escape like a hole is not formed in the pressurizing screw plate 131.

Further, it is preferable that the pressure-applying screw plate 131 is located at the same or higher position in the radial direction outer end portion in the cross-sectional structure as compared with the radially inner side end portion. This is to prevent the sludge from being stuck between the radially outer end of the pressurizing screw plate 131 and the inner circumferential surface of the cylindrical outer cylinder 110.

That is, as shown in FIG. 1, when the radially outer end of the pressing screw plate 131 is located at the same height as the radially inner end, the cross-sectional structure of the pressing screw plate has a flat cross-sectional structure.

On the other hand, a dewatering screw plate 132 is provided so as to face the pressurizing screw plate 131.

The radially outer end of the dewatering screw plate 132 is connected to the pressing screw plate 131 and the radially inner end of the dewatering screw plate 132 is spaced apart from the pressing screw plate 131 in the downward direction, .

That is, the cross-sectional structure formed by the dewatering screw plate 132, the pressing screw plate 131, and the conical inner tube 120 has a triangular shape having a vertex at the radially outer end, .

The dewatering screw plate 132 is provided with a plurality of dewatering holes 132a.

The diameter of the dewatering hole 132a is 0.01 mm to 0.2 mm.

If the diameter of the dewatering hole 132a is more than 0.2 mm, there is a danger that the amount of water to be dewatered increases and the coagulated sludge comes out together.

When the diameter of the dewatering hole 132a is less than 0.01 mm, the amount of dewatered water becomes too small due to a too small size, and the dewatering efficiency is rapidly lowered.

The dewatering hole 132a is previously formed in the flat plate state before the dewatering screw plate 132 is deformed spirally through laser machining or the like and then the dehydration hole 132a is formed by deforming the flat plate shape into a spiral shape The spiral dewatering screw plate 132 is completed.

As described above, in this embodiment, the dewatering screw plate 132 having the dewatering hole 132a can be easily manufactured.

On the other hand, on the main surface of the conical inner tube 120, a plurality of communicating tubes (not shown) are formed through the dewatering hole 132a so that the dewatered liquid introduced between the pressing screw plate 131 and the dewatering screw plate 132 flows into the conical inner tube 120 A sphere 124 is formed.

Since the space of the triangular cross section formed by the dewatering screw plate 132, the pressing screw plate 131 and the conical inner cylinder 120 is helically wound along the outer peripheral surface of the conical inner cylinder 120, theoretically, 124 may be formed. However, in this embodiment, a plurality of communication ports 124 are formed.

The dewatered liquid introduced into the conical inner cylinder 120 through the communication port 124 is discharged to the outside of the cylindrical outer cylinder 110 along the dewatering liquid discharge path 122.

In this embodiment, the dehydrating solution discharge path 122 is formed by forming the second support shaft 122 in the shape of a tube.

When the dewatered liquid of the conical inner cylinder 120 is discharged to the outside of the cylindrical outer cylinder 120 along the axial direction of the cylindrical outer cylinder 110, particularly along the axis center, the discharge structure is extremely simplified.

The operation of the present embodiment will be described below.

The polymer flocculant is introduced into the reaction tank containing the water-containing sludge so that the polymer flocculant is mixed with the sludge, and the sludge mixed with the polymer flocculant is introduced into the sludge inlet 111 of the present screw extruder .

Thus, the sludge to be treated is a mixture of flocculated sludge and water mixed by the flocculant.

The sludge to be treated which is introduced into the sludge inlet 111 is squeezed while being conveyed upward by the screw member 130, specifically, the pressurizing screw plate 131 located under the sludge to be treated, The water (dewatered liquid) located at the upper portion of the sludge to be treated flows into the screw member 130 through the dewatering hole 132a of the dewatering screw plate 132 located at the upper portion of the dewatering screw plate 132, To the interior of the conical inner cylinder 120 and then to the outside of the cylindrical outer cylinder 110 through the dehydrating liquid discharge passage 122. [

The sludge gradually dehydrated and condensed is discharged to the outside of the cylindrical outer cylinder 110 through the sludge outlet 112.

As described above, in the present embodiment, the sludge to be treated is compressed while being conveyed upward by the pressurizing screw plate 131 located at the lower part, and is discharged through the dehydrating hole 132a of the upper dehydrating screw plate 132, And the inside of the conical inner cylinder 120 is used as a path through which the dewatering liquid is discharged, the overall structure becomes extremely simple with high dewatering efficiency.

Also, in this embodiment, the sludge to be treated is dewatered by using a difference in specific gravity between water and agglomerated sludge, thereby preventing the dewatering hole of the dewatering screw plate from being clogged. Therefore, the present embodiment does not require a device for cleaning a blocked dewatering hole basically necessary in the prior art.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Vertical screw dehydrator
110: Cylindrical outer cylinder 111: Sludge inlet
112: sludge outlet
120: conical inner tube 121: first support shaft
122: second support shaft, dehydrating liquid discharge path 123: bearing
124:
130: screw member 131: pressure screw plate
132: Dewatering screw plate 132a: Dewatering hole
140: rotation drive member 141: motor
142: drive gear 143: driven gear

Claims (3)

A cylindrical outer tube having a sludge inlet port through which a sludge to be treated flows in a lower end thereof and a sludge outlet port through which the sludge dewatered in the upper end flows,
A conical inner cylinder rotatably disposed inside the cylindrical outer cylinder concentrically with an axial center of the cylindrical outer cylinder, the conical inner cylinder having a shape gradually increasing in diameter from a lower end to an upper end of the cylindrical outer cylinder;
The radially outward end portion of the conical inner cylinder is maintained in a diameter corresponding to the inner diameter of the cylindrical outer cylinder and the radially inner end portion is fixed to the conical inner cylinder while being helically wound along the outer circumferential surface of the conical inner cylinder, And the radially outer side end portion of the pressing screw plate is spaced apart from the pressing screw plate in the downward direction and the radially outer side end portion of the pressing screw plate is spaced apart from the outer circumferential surface of the conical inner cylinder And a dewatering screw plate having a plurality of dewatering holes formed therein;
A rotation driving member provided to rotationally drive the conical inner cylinder;
And,
Wherein the sludge to be treated is composed of flocculated sludge having a specific gravity larger than that of water and water,
Due to the difference in specific gravity between the water and the flocculating sludge, water floating on the flocculating sludge is discharged as a dehydrating solution through the dehydrating hole of the dehydrating screw plate,
A communicating hole is formed in the main surface of the conical inner cylinder so that the dewatered liquid flowing into the space between the pressing screw plate and the dewatering screw plate through the dewatering hole is introduced into the conical inner cylinder,
And a dehydrating liquid discharge path for discharging the dewatered liquid introduced into the conical inner cylinder to the outside of the cylindrical outer cylinder along the axial direction of the cylindrical outer cylinder is formed
Which is characterized by the difference in specific gravity between water and agglomerated sludge.
The method according to claim 1,
Wherein the pressing screw plate has a flat cross-sectional structure, and the radially outer side end portion and the radially inner side end portion of the pressing screw plate are located at the same height in the cross-sectional structure of the pressing screw plate. Vertical screw dehydrator.
3. The method according to claim 1 or 2,
Characterized in that the diameter of the dewatering hole is 0.01 mm to 0.2 mm. The vertical screwdrier dehydrator using the difference in specific gravity between water and agglomerated sludge.

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