WO2015029662A1

WO2015029662A1 - Defoaming device

Info

Publication number: WO2015029662A1
Application number: PCT/JP2014/069714
Authority: WO
Inventors: 博文代田; 誠人尾田; 寿生萩本
Original assignee: 三菱重工環境・化学エンジニアリング株式会社
Priority date: 2013-08-26
Filing date: 2014-07-25
Publication date: 2015-03-05
Also published as: KR101859853B1; CN105407996B; KR20160018687A; JP6148935B2; JP2015042400A; CN105407996A

Abstract

Provided is a defoaming device that has a driving unit, a rotary shaft (2) that rotates by way of the driving unit, a hollow structure defoaming blade (4) that is attached to the rotary shaft (2), and an axial guiding device (16) that is attached below the defoaming blade (4) and that creates a flow toward the defoaming blades (4) in the axial direction of the rotary shaft (2).

Description

Defoaming device

The present invention relates to an antifoaming device.
This application claims priority on Japanese Patent Application No. 2013-175045 filed on August 26, 2013, the contents of which are incorporated herein by reference.

As a defoaming device for treating a large amount of foam generated on water to be treated in a container and suppressing foam leakage and deterioration of the working environment, an apparatus described in Patent Document 1 is known.
The defoaming device includes an upper plate, a lower plate, a plurality of fins arranged radially from the rotation center between the upper plate and the lower plate, and a bubble suction port opened at the rotation center of the lower plate, A rotor (antifoaming blade) having Between the fins, a defoaming path is formed which communicates with the foam suction port and has a discharge port on the outer peripheral side of the rotor, and the foam collides with the upper plate, the lower plate and the fin and is destroyed.

JP 2007-216113 A

On the other hand, the defoaming device is required to widen the range of the effect of the defoaming effect brought about by the defoaming device on the bubbles on the water to be treated. Specifically, the defoaming apparatus has a demand not only for defoaming but also for exerting a defoaming action on bubbles separated from the defoaming blade. Moreover, there exists a request | requirement in an antifoaming device to dissolve what the foam concentrated in the liquid by settling a foam. That is, the defoaming apparatus is desired to increase the height of the foam that can be treated and to promote the dissolving action.
However, when only the shape of the defoaming blade is changed, there is a limit to the height of the foam that can be treated, and the range of the effect of the defoaming action cannot be widened.

An object of the present invention is to provide a defoaming device capable of widening the range of the effect of the defoaming effect brought about by the defoaming device.

According to the first aspect of the present invention, the defoaming device includes a drive unit, a rotation shaft rotated by the drive unit, a hollow defoaming blade attached to the rotation shaft, and the defoaming device. And an axial guide device that is attached below the blade and creates an axial flow of the rotating shaft with respect to the defoaming blade.

According to the above configuration, the fluidity directed upward or the fluidity directed downward is given to the foam part by inserting the axial guide device into the foam part. Thereby, the defoaming effect brought about by the defoaming device can be changed.

In the defoaming device, the axial guide device protrudes from an outer peripheral surface of the shaft portion and a shaft portion provided concentrically with the rotation shaft, and is provided spirally on the outer peripheral surface of the shaft portion. It is good also as a structure which has a protruding item | line part.

According to the above configuration, the direction in which the fluidity is given can be controlled by reversing the rotation of the shaft portion of the axial guide device. That is, the defoaming effect can be promoted by rotating the axial guide device in one direction, and the foam portion can be settled by rotating in the other direction.

In the defoaming device, the axial guide device may include a shaft portion provided concentrically with the rotation shaft, and a plurality of recesses formed on an outer peripheral surface of the shaft portion.

In the defoaming device, the axial guide device may include a shaft portion provided concentrically with the rotating shaft, and a plurality of protrusions formed on an outer peripheral surface of the shaft portion.

In the defoaming device, the axial guide device includes a shaft portion concentrically provided with the rotation shaft, and a plurality of shaft portions protruding from an outer peripheral surface of the shaft portion and extending along a longitudinal direction of the shaft portion. It is good also as a structure which has a blade part.

According to the present invention, the fluidity directed upward or the fluidity directed downward is imparted to the foam part by inserting the axial guide device into the foam part. Thereby, the defoaming effect brought about by the defoaming device can be changed.

It is the side view which carried out partial cross section of the defoaming device of a first embodiment of the present invention. It is a perspective view of the defoaming body and axial direction guide apparatus of the defoaming apparatus of 1st embodiment of this invention. It is a top view of the defoaming body of the defoaming apparatus of 1st embodiment of this invention. It is A arrow directional view of FIG. 3, Comprising: It is a side view of the defoaming blade | wing of the defoaming apparatus of 1st embodiment of this invention. FIG. 4 is a side view of the defoaming blade of the defoaming device according to the first embodiment of the present invention, as viewed from the direction indicated by the arrow B in FIG. 3. It is a side schematic diagram explaining the operation of the defoaming device of the first embodiment of the present invention. It is a side schematic diagram explaining the operation of the defoaming device of the first embodiment of the present invention. It is a side view of the modification of the defoaming apparatus of 1st embodiment of this invention. It is a side view of the modification of the defoaming apparatus of 1st embodiment of this invention. It is a perspective view of the defoaming body and axial direction guide apparatus of the defoaming apparatus of 2nd embodiment of this invention. It is a perspective view of the modification of the defoaming body of the defoaming apparatus of 2nd embodiment of this invention, and an axial direction guide apparatus. It is a perspective view of the defoaming body and axial direction guide apparatus of the defoaming apparatus of 3rd embodiment of this invention. It is a perspective view of the modification of the defoaming body of the defoaming apparatus of 3rd embodiment of this invention, and an axial direction guide apparatus. It is a perspective view of the modification of the defoaming body of the defoaming apparatus of 3rd embodiment of this invention, and an axial direction guide apparatus. It is the top view seen from the axial direction of the axial direction guide apparatus of 3rd embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front sectional view showing a state in which the defoaming apparatus 1 is installed in a cylindrical processing tank 50 in which the liquid W to be processed is stored. The treatment tank 50 is provided in a part of equipment for concentrating the waste water to make it semi-solid and finally incinerating it. The treatment tank 50 is supplied or discharged with waste water that becomes the liquid W to be treated through the water supply / drainage device 51.
In addition, the waste water used as the liquid W to be treated includes, for example, ethylene glycol, a surfactant, and adhesive components such as acrylamide and cyanoacrylate. Bubbles (indicated by symbol B) generated by transportation, stirring, centrifugation, etc. are floating on the surface of the waste water.

The processing tank 50 in which the defoaming apparatus 1 is provided has a side wall 52 that surrounds the periphery and a slab 53 that covers the upper part thereof. A cylindrical support portion 55 is provided in the opening 54 formed in the center of the slab 53. A mounting base 56 is provided on the upper portion of the support portion 55. The mounting base 56 supports the defoaming device 1. A drive motor 57 as a drive unit is provided at the center of the mounting base 56, and the defoaming body 3 and the axial guide device 16 according to the present invention are attached to the rotating shaft 2 of the drive motor 57.

The rotary shaft 2 of the drive motor 57 is arranged in the vertical direction at the upper center of the processing tank 50. The defoamer 3 and the axial guide device 16 are attached to the lower end of the rotating shaft 2. The rotating shaft 2 is provided on the mounting base 56 so as to be movable in the vertical direction along the axis 2 A of the rotating shaft 2.

Next, the defoamer 3 of this embodiment will be described.
As shown in FIGS. 2, 3, 4, and 5, the defoaming body 3 has a pair of defoaming blades 4 having a hollow structure arranged at intervals in the circumferential direction of the rotating shaft 2. Yes. Each of the defoaming blades 4 is opened to the upstream side in the rotational direction R of the rotating shaft 2 and the inlet 5 into which the bubbles B flow in, and the outlet opening to the radially outer side of the rotating shaft 2 to discharge the bubbles B 6. The defoamer 3 rotates with the inflow port 5 forward by the rotation of the rotating shaft 2.

The defoaming blade 4 is composed of a pair of plate members that are spaced apart from each other in the axial direction of the rotary shaft 2, and an upper disk 7 and a lower disk 8, and a partition plate 9 that connects the upper disk 7 and the lower disk 8. And have. The upper disk 7 and the lower disk 8 are plate-like members that are formed so as to protrude radially outward from the rotary shaft 2 and have a substantially triangular shape in plan view.

The defoaming blade 4 forms a channel having a triangular cross section by three surfaces including the upper disk 7, the lower disk 8, and the partition plate 9.
The main surface of the lower disk 8 is formed so as to be orthogonal to the axis 2 A of the rotating shaft 2. The upper disk 7 is an inclined surface that is inclined with respect to the axis 2 A of the rotary shaft 2. The partition plate 9 is formed to be orthogonal to the lower disk 8.

Between the front side of the upper disk 7 in the rotational direction R (hereinafter referred to as the upper front side 11) and the front side of the lower disk 8 in the rotational direction R (lower front side 12) Is formed. The inflow port 5 is a triangular opening composed of the upper front side 11 of the upper disk 7, the lower front side 12 of the lower disk 8, and the outer peripheral surface of the rotating shaft 2.

The lower front side 12 of the lower disk 8 is formed to form a straight line extending outward in the radial direction from the rotary shaft 2.
In the upper front side 11 of the upper disk 7, the inner side in the radial direction (hereinafter simply referred to as the radial direction) of the rotary shaft 2 is retracted rearward in the rotational direction R from the lower front side 12 of the lower disk 8. Specifically, as shown in FIG. 3, the upper front side 11 of the upper disk 7 has a radially outer end 11 a that coincides with a radially outer end 12 a of the front side of the lower disk 8. The radially inner end portion 11b moves rearward in the rotational direction R from the radially inner end portion 12b of the lower disk 8.

Sides of the upper disk 7 and the lower disk 8 in the rotation direction R (hereinafter referred to as the rear side 13) are formed so as to form a straight line extending outward in the radial direction from the rotation shaft 2.
Further, the sides of the upper disk 7 and the lower disk 8 that are not connected to the rotating shaft 2 (hereinafter referred to as the side 14) are formed to be orthogonal to the lower front side 12. ing.

The vicinity of the portion where the rear side 13 and the side side 14 of the upper disk 7 and the lower disk 8 intersect has an obliquely cut shape. In this part, a discharge port 6 for the flow path is formed.
The rear side 13 of the upper disk 7 and the rear side 13 of the lower disk 8 are connected via a partition plate 9. That is, the partition plate 9 is formed so as to face the foam B flowing in from the inflow port 5 and to guide the foam B to the discharge port 6.

The upper disk 7 and the lower disk 8 are directly connected to each other at the side edges 14. As a result, the upper disk 7 and the lower disk 8 gradually approach from the radially inner side toward the radially outer side. That is, the upper disk 7 has an inclined surface that is inclined with respect to the horizontal.

Next, the axial direction guide apparatus 16 of this embodiment is demonstrated.
As shown in FIG. 2, the axial guide device 16 includes a cylindrical shaft portion 17 formed concentrically with the rotation shaft 2 so that the rotation shaft 2 is extended, and an outer peripheral surface of the shaft portion 17. And a spiral blade portion 18 that is a pair of protruding strip portions. The spiral blade portion 18 has a double spiral structure.

The shaft portion 17 extends below the defoaming body 3. The shaft part 17 is sufficiently longer than the dimension (thickness) in the axial direction of the defoamer 3 (for example, 5 times). That is, the shaft portion 17 has a length capable of contacting the foam B even when the lower surface of the defoaming body 3 is separated from the foam surface SB (see FIG. 1).

The spiral blade portion 18 is a plate-like member that protrudes from the outer peripheral surface of the shaft portion 17 and spirally provided on the outer peripheral surface of the shaft portion 17. The diameter of the spiral blade portion 18 of the present embodiment is substantially equal to the diameter of the defoaming body 3.
The shaft portion 17 of the axial direction guide device 16 may be one obtained by extending the rotating shaft 2 downward. That is, the rotating shaft 2 and the shaft portion 17 may be formed integrally.

The spiral blade portion 18 of the axial direction guide device 16 of the present embodiment is formed to be right-handed (Z-wound) corresponding to the shape of the defoaming body 3. One of the pair of spiral blade portions 18 is connected to the lower front side 12 of the lower disk 8 constituting the inflow port 5 of the one defoaming blade 4. The other of the pair of spiral blade portions 18 is connected to the lower front side 12 of the inlet 5 of the other defoaming blade 4.

The effect | action of said defoaming apparatus 1 is demonstrated.
As shown in FIG. 6, the operation when the defoaming body 3 is located above the foam surface SB and the lower end of the axial guide device 16 is located slightly above the liquid level SW will be described. To do.

As indicated by an arrow R1 in FIG. 6, the defoaming body 3 and the axial guide device 16 are rotated by driving the rotating shaft 2 of the drive motor 57 (see FIG. 1). The rotation speed is preferably about 1000 rpm. Then, the fluidity | liquidity which goes upwards is given to the foam B, and the foam B is introduce | transduced into the defoaming body 3 located above the foam surface SB. That is, the foam B can be sucked into the defoaming body 3 even when the height of the foam is lower (SB2) than the foam height (SB1) suitable for defoaming by the normal defoaming body 3.
Specifically, the bubble B that has contacted the spiral blade portion 18 of the axial guide device 16 moves upward so as to be carried to the spiral blade portion 18. Since the spiral blade 18 and the lower disk 8 are connected, the foam B is smoothly introduced into the defoaming body 3. This promotes the defoaming effect.

The foam B introduced into the defoaming body 3 by the axial guide device 16 flows in from the inlet 5 and is discharged from the outlet 6. At this time, since the upper disk 7 and the lower disk 8 are configured to gradually approach toward the outer side in the radial direction, the bubbles B flowing in from the inlet 5 are reliably compressed and broken.
In addition, since the upper front side 11 of the upper disk 7 is arranged offset to the discharge port 6 side, the bubbles B are swallowed from above the inflow port 5.

On the other hand, when the inflow port 5 sucks bubbles, shear bubble breakage occurs due to the rotation of the defoaming blade 4. The suction force of the bubbles B at the inlet 5 is further increased by the occurrence of shear bubble breakage.
In addition, since the upper disk 7 is inclined downward, the foamed foam B is sprayed downward and far away, and defoaming due to the shower effect is performed.

On the other hand, when the defoamer 3 and the axial guide device 16 are rotated in the direction indicated by the arrow R2 in FIG. 7, that is, the direction opposite to R1 in FIG. That is, fluidity toward the bottom is given to the bubbles B. Specifically, the bubble B that has contacted the spiral blade portion 18 of the axial guide device 16 moves downward so as to be carried to the spiral blade portion 18. Thereby, the effect | action which dissolves what the bubble B compressed in the to-be-processed liquid W is accelerated | stimulated.

According to the above-described embodiment, by inserting the rotating axial guide device 16 into the foam surface SB, fluidity directed upward or downward fluidity is imparted to the foam surface SB. Thereby, the defoaming effect | action brought about by the foam B on the to-be-processed water W by the defoaming apparatus 1 can be changed.

Further, by reversing the rotation of the shaft portion 17 of the axial direction guide device 16, the direction in which the fluidity is given can be controlled. That is, the defoaming effect can be promoted by rotating the axial guide device 16 in one direction, and the bubbles B can be settled by rotating in the other direction.

Moreover, in the defoaming body 3, when the foam B flowing in from the inflow port 5 moves toward the discharge port 6, the upper disk 7 and the lower disk 8 gradually decrease in the axial interval toward the radially outer side. Compressed. In the defoaming device 1, the side edges 14 of the upper disk 7 and the lower disk 8 are connected to each other, and the interval between the bubbles in the axial direction becomes narrower. Therefore, the compression effect can be further enhanced.
Moreover, since the defoaming blade 4 is formed only by the upper disk 7, the lower disk 8 and the partition plate 9, the number of parts constituting the defoaming blade 4 can be reduced. That is, the defoaming blade 4 can be formed more easily.

Moreover, compared with the case where the inflow port 5 is made into a rectangular shape, the length in the radial direction can be made longer while securing the area of the inflow port 5. That is, the radial length of the inflow port 5 can be increased without increasing the resistance when rotating. Thereby, the peripheral speed of the edge part of the radial direction outer side of the defoaming blade | wing 4 becomes large. Thereby, the shear bubble breaking effect can be increased.
In addition, when the rectangular inflow port 5 and the axial length and the radial length are the same, the opening area becomes small, so that the power can be reduced.

Also, since the inflow port 5 is opened upward, it is possible to swallow the bubbles from above. Thereby, more bubbles B can be processed.

In addition, the shape of the axial direction guide apparatus 16 is not restricted to what was mentioned above, It can change suitably.
For example, in the above embodiment, the spiral blade portion 18 has a double spiral structure, but the single spiral blade portion 18 may be provided on the outer peripheral surface of the shaft portion 17 without making the spiral blade portion 18 double. Good. Alternatively, three or more spiral blade portions 18 may be provided.
Further, the winding direction of the spiral blade portion 18 is not limited to the right winding (Z winding), and may be the left winding (S winding).

Further, the spiral blade portion 18 does not need to be formed from a plate-like member, and as shown in FIG. 8, a rod 19 having a square cross section may be wound in a spiral shape. The cross-sectional shape of the bar 19 is not limited to a rectangular shape, and may be a round shape or a triangular shape.

Furthermore, as shown in FIG. 9, it is good also as a structure which forms the helical groove | channel 20 in the axial part 17. As shown in FIG. The cross-sectional shape of the groove 20 may be an arc shape or a rectangular shape.

(Second embodiment)
The defoaming device of 2nd embodiment which concerns on this invention is demonstrated based on drawing. In the present embodiment, differences from the first embodiment described above will be mainly described, and description of similar parts will be omitted.
As shown in FIG. 10, the axial guide device 16 B of the present embodiment includes a shaft portion 17 and a plurality of recess portions 21 formed on the outer peripheral surface of the shaft portion 17.

The recess 21 is a hemispherical recess and is regularly formed on the outer peripheral surface of the shaft 17. Specifically, a plurality of rows are formed in the circumferential direction of the shaft portion 17 by a plurality of recesses 21 arranged linearly in the axial direction of the shaft portion 17. The recesses 21 adjacent in the circumferential direction are formed offset in the axial direction.

Next, the effect | action of the defoaming apparatus 1 of this embodiment is demonstrated.
When the axial guide device 16B is arranged at the same position as in FIG. 1 and the axial guide device 16B is rotated, the bubble B is directed upward depending on the properties such as the viscosity of the liquid W to be processed and the shape of the recess 21. Fluidity is given or downward fluidity is given.
As described above, since the behavior of the bubbles B changes according to the shape, size, quantity, interval, and the like of the recess 21, it is preferable to appropriately adjust according to the properties of the liquid W to be processed.

Note that the shape of the recess 21 is not limited to the above-described hemispherical shape, and may be, for example, a quadrangular recess. Further, a hemispherical dent and a quadrangular dent may be mixed.
Moreover, as shown in FIG. 11, it is good also as the protrusion 22 of hemispherical shape instead of a dent. The shape of the protrusion 22 is not limited to a hemispherical shape, and may be a rectangular protrusion.
Moreover, it is good also as a structure in which the hollow part 21 and the protrusion 22 are mixed.

The configuration of the recess 21 and the protrusion 22 can be appropriately adjusted according to the properties of the liquid W to be processed. For example, the recess 21 can be formed above the axial guide device 16B, and the protrusion 22 can be formed below the axial guide device 16B. Thereby, the contact area of the bubble B and the axial direction guide apparatus 16 becomes large as it goes below the axial direction guide apparatus 16B.

(Third embodiment)
Hereinafter, the defoaming device of 3rd embodiment which concerns on this invention is demonstrated based on drawing.
As illustrated in FIG. 12, the axial guide device 16 C of the present embodiment has a plurality of linear blades that protrude from the outer peripheral surface of the shaft portion 17 and the shaft portion 17 and extend along the longitudinal direction of the shaft portion 17. Part 23.
Specifically, the straight blade portion 23 is a rectangular plate-like member provided in plural (four in this embodiment) at equal intervals in the circumferential direction of the shaft portion 17. The straight blade portion 23 is attached so as to be orthogonal to the outer peripheral surface of the shaft portion 17.

Similarly to the axial guide device 16B of the second embodiment, the axial guide device 16C of the present embodiment is arranged at the same position as in FIG. 1, and when the axial guide device 16C is rotated, Depending on the properties such as the viscosity of the liquid W to be treated and the size of the straight blade 23, the bubbles B are given fluidity upward or fluidity downwards.

In addition, the shape and quantity of the straight blade portion 23 can be changed as appropriate. For example, as shown in FIG. 13, it may be a triangular triangular blade portion 24 that becomes wider as it goes downward. By becoming such a shape, the contact area between the bubble B and the axial guide device 16C increases as it goes downward.

Moreover, as shown in FIG. 14, the shape of the linear blade | wing part 23 is not restricted to the rectangular plate shape mentioned above, For example, it is good also as a shape using the rod-shaped member 25 with a circular cross section. The cross-sectional shape of the rod-like member 25 is not limited to a circle, and may be a square shape or a triangle shape.
Further, as shown in FIG. 15, the linear blade portion 23 (or the triangular blade portion 24) may be inclined and attached to the shaft portion 17. For example, when the radial outer peripheral side of the straight blade portion 23 is inclined so as to go to the downstream side in the rotation direction, the resistance when the axial guide device 16C rotates can be reduced.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. Moreover, the structure which combined the characteristic demonstrated by said several embodiment arbitrarily may be sufficient.

DESCRIPTION OF SYMBOLS 1 Defoamer 2 Rotating shaft 3 Defoamer 4 Defoam blade 5 Inlet 6 Outlet 7 Upper disk (plate member)
8 Lower disc (plate member)
DESCRIPTION OF SYMBOLS 9 Partition plate 11 Upper front side 12 Lower front side 16 Axial direction guide device 17 Shaft part 18 Spiral blade part (ridge part)
DESCRIPTION OF SYMBOLS 19 Bar 20 Groove 21 Recessed part 22 Protrusion 23 Linear blade part 24 Triangular blade part 25 Bar-shaped member 50 Treatment tank 51 Water supply / drainage device 52 Side wall 54 Opening part 57 Drive motor (drive part)
B Bubble R1, R2 Rotation direction W Processed liquid

Claims

A drive unit;
A rotating shaft rotated by the driving unit;
A hollow defoaming blade attached to the rotating shaft;
An anti-foaming device, comprising: an axial guide device that is attached below the defoaming blade and creates an axial flow of the rotating shaft with respect to the defoaming blade.
The axial direction guide device includes: a shaft portion provided concentrically with the rotation shaft; and a protruding portion provided in a spiral shape on the outer peripheral surface of the shaft portion while projecting from the outer peripheral surface of the shaft portion. The defoaming apparatus according to claim 1, comprising:
The said axial direction guide apparatus has the axial part provided concentrically with the said rotating shaft, and the several recessed part formed in the outer peripheral surface of the said axial part, The eraser of Claim 1 characterized by the above-mentioned. Foam equipment.
The said axial direction guide apparatus has the axial part provided concentrically with the said rotating shaft, and several protrusion part formed in the outer peripheral surface of the said axial part, The eraser of Claim 1 characterized by the above-mentioned. Foam equipment.
The axial direction guide device includes: a shaft portion provided concentrically with the rotation shaft; and a plurality of blade portions protruding from an outer peripheral surface of the shaft portion and extending along a longitudinal direction of the shaft portion. The defoaming apparatus according to claim 1, comprising: