KR101889663B1 - Circular Type Thickener - Google Patents

Abstract

The present invention relates to a circular sludge concentrator preventing sludge channeling. More specifically, the circular sludge concentrator includes: a concentrator body (100) having a predetermined internal diameter, including a hopper (110) installed in the center, and having a circular shape to separate sludge into solids and liquid; a first rotary shaft (130) connected with a rake (131) and a scarper (132) for directing the sludge, settled on the floor of the body (100), to the hopper (110); a center column (120) including a rotating part (200) located in the upper part, and surrounded by the first rotary shaft (130); a feed well (190) surrounding a predetermined part of the first rotary shaft (130), and having upper and lower parts open; a center column support (170) supporting the center column (120) and located in the upper part of the hopper (110); an inflow pipe (210) supplying sludge to be concentrated to the feed well (190); a second rotary shaft (140) placed vertically in the center column (120) and meeting the floor surface of the hopper (110); and a blade (150) fixed to the lower part of the second rotary shaft and located in the hopper (110) to stir the concentrated sludge collected in the hopper (110).

Description

A circular sludge thickener capable of preventing sludge channeling {Circular Type Thickener}

The present invention relates to a circular sludge thickener capable of preventing sludge channeling. More particularly, the present invention relates to a circular sludge thickener capable of preventing the sludge channeling phenomenon frequently occurring at the time of discharging thickened sludge, a hopper is formed at the center of the thickener, The present invention relates to a circular sludge thickener capable of preventing a channeling phenomenon by including a blade and a perforated plate rotatable by a centrifugal force.

In water treatment processes such as wastewater treatment and water treatment, a large amount of solid matter, that is, sludge is generated. Such sludge may be disposed of through landfill or incineration, and may be reused as a heating fuel depending on the characteristics of the sludge.

However, since these sludges contain a large amount of water, a dehydration process including enrichment for lowering the moisture to below a certain level is indispensable.

In a circulating type thickener tank which is widely used, the sludge containing the solid content is allowed to stand for a long time, so that the solid material is caused to settle down to its bottom by its own weight, and the precipitated solid material is moved to the sludge hopper located in the thickener tank by rotating the scraper, As shown in FIG.

However, at the time of discharging the concentrated sludge, sludge channeling phenomenon occurs due to occurrence of short-circuit flow around the discharge pipe as the sludge concentration becomes higher and the discharge rate becomes faster, so that the concentration sludge around the discharge pipe and the concentration The sludge containing a large amount of water is frequently discharged, resulting in an increase in the cost of the sludge treatment due to an increase in the cost of the dewatering and drying process and an increase in the moisture content of the cake.

In order to solve the above problems, Korean Patent Registration No. 1454553 discloses a circular precipitator 1 in which a rotary shaft 2 is installed at the center of a circular precipitator 1 and a sloped bottom 3 A hopper 4 in which sludge is accumulated at the center of the inclined bottom 3 and a sludge accumulating in the inclined bottom 3 and the hopper 4 is sucked to the outside of the circular precipitator 1 (11) which is fixed to the lower side of the rotary shaft (2) and is formed into a cylindrical shape so that sludge is discharged to the outside, and a suction port (10) having a cylindrical rotating body (12) connected to the rotating shaft (2) and rotated; A sludge discharge pipe 21 connected to the rotor assembly 10 and connected to the sludge discharge pipe 21 through a plurality of pipes so as to discharge the sludge and sludge accumulated in the hopper 3 at the lower end of the sludge discharge pipe 21, And a sludge suction header (22) formed with a plurality of suction plates (22a) sucked downward; And a sludge inhaler (30) connected to the upper side of the rotor assembly (10) for sucking and discharging sludge accumulated on the inclined bottom of the settling basin.

However, in the case of the prior art, only the structure inside the hopper is complicated, and sludge channeling can not still be prevented.

Korean Patent Registration No. 1454553

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circular concentrator capable of preventing a channeling phenomenon occurring in a sludge concentration tank.

In order to solve the above problems, the present invention provides a concentrator capable of preventing sludge channeling, comprising: a concentrator main body 100 having a predetermined inner diameter and a circular shape for solid-liquid separating sludge having a hopper 110 at the center; A first rotating shaft 130 to which a rake 131 and a scraper 132 are connected to guide the sludge settled to the bottom of the concentrating tank main body 100 to the hopper 110; A center column 120 having a rotation driving part 200 disposed thereon and surrounded by a first rotation shaft 130; A feed well 190 that surrounds a predetermined portion of the first rotation shaft 130 and has an open bottom and an open top; A center column support (170) positioned above the hopper (110) for supporting the center column (120); An inlet pipe (210) for supplying sludge to the feed well (190); A second rotation shaft 140 vertically disposed in the center column 120 and having a lower end in contact with a bottom surface of the hopper 110; And a blade 150 which is fixed to the lower end of the second rotation shaft 140 and is located inside the hopper 110 and has one or more slots 151 for stirring the concentrated sludge collected in the hopper 110 Wherein the blade 150 is spaced from the bottom surface of the hopper 110 by a predetermined distance and a gap between the blade 150 and the bottom surface of the hopper 110 is greater than or equal to one A space S having a trapezoidal cross section having a longer upper side than the lower side is provided between the bottom surface of the hopper 110 and the perforated plate 160, And a concentrated sludge discharge pipe 230 for discharging the concentrated sludge to the outside from the space S is provided and the first rotary shaft 130 and the second rotary shaft 140 are connected to each other, And the total cross-sectional area of the lower portion of the through- Is not more than the cross sectional area of the concentrated sludge discharge pipe (230)

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According to the circular concentrator capable of preventing sludge channeling according to the present invention, a hopper having a predetermined size of space is provided at the center of the concentrator, thereby enhancing the concentration effect of the sludge.

In addition, the inside of the hopper is provided with a scraper, a rotating blade, and a fixed porous plate, and the stirring function of the drainage blades of the concentrated sludge and the rectifying function of the porous plate can be advantageously suppressed.

1 is a cross-sectional view of a circular thickener capable of preventing sludge channeling according to a preferred embodiment of the present invention.
2 is an enlarged cross-sectional view of a perforated plate (a, a plan view, and a cross-sectional view)

The use of the terms "comprises", "having", or "having" in this application is intended to specify the presence of stated features, integers, steps, components, parts, or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a circular concentrator capable of preventing sludge channeling according to the present invention will be described with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

FIG. 1 is a sectional view of a circular thickener capable of preventing sludge channeling according to a preferred embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a perforated plate.

1, a circular concentrator capable of preventing sludge channeling according to the present invention includes a concentrator main body 100, a center column 120, a first rotating shaft 130, a second rotating shaft 140, a blade 150, And includes a perforated plate 160, a center column support 170, a bridge 180, a feed well 190, and a rotation driving unit 200.

The concentrator main body 100 has a predetermined inner diameter, and the bottom surface is inclined toward the center so as to easily collect the precipitated sludge in the center. In particular, it is preferable to provide a hopper 110 having a structure having a predetermined depth and width at the center of the bottom. Specific functions of the hopper 110 will be described later.

The center column 120 is vertically positioned at the center of the concentration tank main body 100, and the rotation driving unit 200 is provided at an upper portion thereof. A first rotary shaft 130 for rotating the rake 131 is disposed outside the center column 120. The first rotary shaft 130 may have a rectangular truss structure or a pipe structure, It is not particularly limited as long as it can rotate.

A rake 131 rotating at a predetermined speed is fixed to the lower end and / or the side surface of the first rotary shaft 130 along the bottom surface of the thickener, and a scraper 132 are connected. The rak 131 and the scraper 132 are rotated by the rotation of the first rotating shaft 130 so that the scraper 132 can return the settled sludge to the hopper 110 .

Conventionally, the circular concentrator or circular precipitator has a structure similar to that of the hopper 110 of the present invention, but a concrete structure for supporting the center column 120 occupies most of the hopper space at the center of the hopper. This concrete structure is insufficient for the storage space of concentrated sludge and also channeling phenomenon due to a short-circuit flow at the outlet of the discharge pipe at the time of discharge, so that the sludge is not uniformly discharged.

In the present invention, a hopper 110 capable of providing a space where the concentrated sludge can be sufficiently accommodated, and a rotatable blade 150 disposed inside the hopper 110 to discharge the concentrated sludge, The above problems are dramatically improved by the stirring function and the rectifying function of the perforated plate 160.

Specifically, the center column 120 is mounted on a center column support 170 having a rectangular truss structure. A second rotation shaft 140, which is connected to the rotation driving part 200 and contacts the bottom surface of the hopper 110, And vertically arranged inside the column 120. [

The plate-shaped blade 150 having one or more slots 151 is fixed to a lower end portion of the second rotation shaft 140, that is, a region located in the hopper 110, and the second rotation shaft 140 is rotated The lower blade 150 rotates together.

Here, it is preferable that the first rotation axis 130 and the second rotation axis 140 rotate separately at different speeds.

The scraper 132 connected to the first rotating shaft 130 rotates at a circumferential speed of about 0.6 m / min to prevent scattering of the sludge settled on the bottom of the thickening tank 100, (110). However, since the blade 150 rotates at a very slow speed when the second rotary shaft 140 rotates at the same speed, it is difficult to expect a stirring effect when a large amount of sludge is discharged for a short time. Therefore, it is preferable that the first rotating shaft 130 and the second rotating shaft 140 rotate at different speeds, and the rotation driving means for these rotations will be described later.

The blade 150 is spaced a predetermined distance from the bottom surface of the hopper 110 while a fixed perforated plate 161 having at least one through hole 161 formed between the blade 150 and the bottom surface of the hopper 110 160 may be further provided adjacent to the blade 150 and a space S may be formed between the perforated plate 160 and the bottom surface of the hopper 110. The concentrated sludge on the perforated plate 160 is uniformly moved by the at least one through hole 161 to the lower hopper 110, Since the agitation function of the blade 150 is added at the time of discharging, the concentrated sludge can be discharged while preventing the channeling phenomenon.

Particularly, as shown in Fig. 2, the through hole of the perforated plate 160 has an orifice structure, more specifically, as viewed from the cut surface (Fig. 2 (b)) of the perforated plate 160, . When the orifice structure of the through hole 161 of the perforated plate 160 is adopted as described above, when the sludge is discharged through the concentrated sludge discharge pipe 230, the sludge in the upper portion of the perforated plate 160, It is possible to more easily move the space S to the space S.

Here, the total cross-sectional area of the lower portion of the through-hole 161 is preferably equal to or less than the cross-sectional area of the concentrated sludge discharge pipe 230 so that a negative pressure can be formed on the perforated plate 160.

The perforated plate 160 may be fixed to the second rotary shaft 140 and rotate together with the blades 150, but the perforated plate 160 may be held in a fixed state without rotating, .

When the perforated plate 160 is operated without being rotated, the inner diameter of the fastener 162 is formed larger than the outer diameter of the second rotation shaft 140, which can be realized.

A feed well 190 is fixed to a predetermined position of the first rotating shaft 130 and more specifically to an upper portion of the first rotating shaft 130. An inlet pipe 190 for supplying sludge, (210) is connected to the bottom of the feed well (190).

Hereinafter, the rotation driving means will be described.

The first rotary shaft 130 and the second rotary shaft 140 include a rotary drive unit 200 such as a motor, a two-stage speed reducer 201, and an electromagnetic clutch 202. The first rotary shaft 130 is connected to the rotary drive unit 200 and the two-stage speed reducer 201 so that the hopper 110 collects the sludge settling and concentrating on the bottom of the concentrating tank at all times. The second rotary shaft 140 opens or closes the opening / closing valve 240 continuously or intermittently according to a signal transmitted from the control unit (not shown) at the time of discharging the concentrated sludge, (200).

Hereinafter, an operation method of the circular thickener capable of preventing the sludge channeling as described above will be described.

The low concentration sludge containing a large amount of water is supplied to the bottom of the feed well 190 through the inflow pipe 210. Thereafter, the sludge is supplied into the concentration tank main body 100 after passing through the buffer well of the feed well 190. When the rake 131 and the scraper 132, which are connected to the first rotary shaft 130 at the same time as the above-described sludge is supplied or separately, are mixed at a low speed (about 0.6 m / min and 20 m in diameter concentration tank 0.009 rpm), the sedimented sludge is moved to the hopper 110, and the cleaned water from which the solids are separated is discharged to the supernatant discharge pipe 220 through the circumferential weir of the concentrator.

On the other hand, in the hopper 110, an on / off valve 240 is opened and closed by receiving a signal from a control unit (not shown) so as to discharge the concentrated sludge intermittently or periodically, The second rotary shaft 140 through which the power is transmitted by the first rotary shaft 202 and the blade 150 attached to the rotary shaft 140 rotate to agitate the concentrated sludge.

For example, when the concentrated sludge is continuously discharged through the concentrated sludge discharge pipe 230, it is preferable that the blades 150 are rotated at a constant speed or at regular intervals.

When the concentrated sludge is discontinuously discharged, the blade 150 is rotated a predetermined time before the opening / closing valve 240 of the condensed sludge discharge pipe 230 is opened so that the concentrated sludge in the hopper 110 can be discharged And the like.

 Having thus described a particular portion of the present invention in detail, those skilled in the art will appreciate that these specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby, It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the invention, and that such modifications and variations are intended to fall within the scope of the appended claims.

100: thickener tank main body
110: Hopper
120: Center column
130: first rotating shaft
131: rake 132: scraper
140:
150: blade
151: Slot
160: Perforated plate
161: through hole 162: fastener
170: center column support
180: Bridge
190: Feedwell
200:
201: Two-stage speed reducer 202: Electromagnetic clutch
210: inlet pipe
220: Upper drainage pipe
230: Concentrated sludge discharge pipe
240: opening / closing valve
S: space portion

Claims (6)

A concentrator main body 100 having a circular shape for solid-liquid separation of sludge having a predetermined inner diameter and a hopper 110 at the center thereof;
A first rotating shaft 130 to which a rake 131 and a scraper 132 are connected to guide the sludge settled to the bottom of the concentrating tank body 100 to the hopper 110;
A center column 120 having a rotation driving part 200 disposed thereon and surrounded by a first rotation shaft 130;
A feed well 190 that surrounds a predetermined portion of the first rotation shaft 130 and has an open bottom and an open top;
A center column support (170) positioned above the hopper (110) for supporting the center column (120);
An inlet pipe (210) for supplying sludge to the feed well (190);
A second rotation shaft 140 vertically disposed in the center column 120 and having a lower end in contact with a bottom surface of the hopper 110; And
And a blade 150 which is fixed to the lower end of the second rotation shaft 140 and is located inside the hopper 110 and has one or more slots 151 for stirring the concentrated sludge collected in the hopper 110 However,
The blade 150 is spaced from the bottom surface of the hopper 110 by a predetermined distance and at least one through hole 161 having a lower cross sectional area than the upper cross sectional area is formed between the blade 150 and the bottom surface of the hopper 110 Is formed on the inner surface of the porous plate 160,
A space S having a trapezoidal cross section having a longer upper side than the lower side is formed along the inner wall surface of the hopper 110 between the bottom surface of the hopper 110 and the perforated plate 160, And a concentrated sludge discharge pipe 230 for discharging the concentrated sludge to the outside,
The first rotation axis 130 and the second rotation axis 140 are driven separately,
Wherein a total cross-sectional area of the lower portion of the through hole (161) is equal to or less than a cross-sectional area of the concentrated sludge discharge pipe (230). delete delete delete delete delete

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