JPS58214307A - Defoaming apparatus - Google Patents

Abstract

PURPOSE:To make it possible to carry out gas-liquid separation, by a method wherein foam is passed through a grid from one side thereof while a brush is brought into contact with the outflow side of the grid and the grid or the brush or both of them is made movable and the injection means of a defoamer is provided. CONSTITUTION:Foam flowed into an inflow chamber 9 from a foam inflow pipe 6 is passed through a fixed grid 2 to break foams larger than the mesh opening of thereof to be liquefied. The greater part of fine foams ready to pass the fixed gride 2 are broken by a defoamer injected from a defoamer injection pipe and shearing force acting between the brush 3a attached to a rotary grid 3 and the fixed grid 2 to be separated into a gas and a liquid. The separated gas is passed through the rotary grid 3 and exhausted from an exhaust pipe 7 through the plenum chamber in a hollow pipe 4. In this case, between the rotary grid 3 and the brush 4a of the hollow pipe 4, gas-liquid separation is perfectly carried out by similar action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sewage treatment device, a microorganism culture device 2 fermentation device,
This article relates to improvements in defoaming devices for chemical evaporation ends, concentrators, etc.

In sewage treatment, fermentation tanks, microbial culture tanks, etc.
Liquids containing foaming substances such as surfactants and proteins may foam significantly when stirred or aerated with air, oxygen, etc., resulting in foam and sewage flowing out of the tank or into other related equipment via piping and ducts. This inflow causes various accidents, resulting in a decline in facility functionality or making it difficult to maintain functionality.

Conventionally, various methods have been used to counter these problems, such as spraying water or other liquids, injecting antifoaming agents, stirring impact using rotary blades, impacting sound waves, and crushing foam with a movable grid. There is.

Among these, antifoaming agents, which have recently been significantly developed, are used in most cases, but they are relatively expensive and uneconomical.

Among the above methods, (7) Disadvantages of water or liquid spraying are: (α) It is not effective for highly viscous foam or significant foaming (ゝ0) (h) Requires a large amount of water or liquid circulation .

(C)llj If the nozzle for mist is clogged, it will not be effective.

(a) What are the disadvantages of injecting antifoaming agents?

(α) Antifoaming agents are expensive and uneconomical.

(1) Disadvantages of agitation impact caused by rotary blades, etc. (α) Requires high-speed rotation and has many problems with maintenance and longevity.

(b) It is not effective against significant foaming.

(C) High-speed rotation may cause an adverse effect and promote foaming.

2) The disadvantage of the impact of sound waves is that (a) High-pressure gas is required, which poses a safety problem.

(b) Not effective against significant foaming.

(C) The mechanism is complex and there are many problems with maintenance and longevity.

) What are the disadvantages of using a movable grid?

(a) Since bubbles are crushed only by the movable lattice, bubbles that are smaller than the lattice spacing will pass through the lattice, making defoaming less reliable.

In view of the drawbacks of the above countermeasures, the present invention uses a simple device and a small amount of antifoaming agent to defoam reliably and economically, thereby maintaining the functionality of equipment and facilities. [Proposed] To provide a foam defoaming device that allows foam or a mixture of foam to pass through one side of a grid consisting of a plurality of openings, and a plurality of lines on the outflow side of the grid. Brushes made up of shaped members are installed in contact with each other, and either the grating or the brushes or both are movable, and an antifoaming agent injection means is provided at an arbitrary position of the device to perform gas-liquid separation. This invention relates to a defoaming device characterized by the following structure.

Hereinafter, the present invention will be specifically explained with reference to an embodiment shown in FIG.

In FIG. 1, 1 is a cylindrical case whose center line is vertical, 2 is a cylindrical fixed grid arranged concentrically within the case 1, and the upper and lower ends of the fixed grid 2 are at the top of the case 1. Fixed to the wall and bottom wall. B is a rotating grating rotatably disposed within the fixed grating 2, and a large number of brushes 6α whose tips contact the inner circumferential surface of the fixed grating 2 are implanted on the outer peripheral surface of the rotating grating B. ing. Reference numeral 5 denotes a rotary grating drive motor fixedly installed on the outside of the top wall of the case 1, and the rotary grating 6 is driven and rotated by the motor 5 at an appropriate speed as an axis along the center line of the case 1. It has become. Reference numeral 4 denotes a hollow tube arranged concentrically within the rotating grating filter, and brushes 4α are attached to the outer circumferential surface of the hollow tube 4, each tip of which contacts the inner circumferential surface of the rotating grating B. The lower ends of the case 1 are fixed to the bottom wall of the case 1. Reference numeral 6 denotes a foam inflow pipe provided on the side wall of the case 1, and the foam flow pipe 6 communicates with an inflow chamber 9 formed by the case 1 and the fixed grid 2. 8 is a drain pipe provided on the bottom wall of the case 1; 7 is an exhaust pipe provided on the bottom wall of the case 1 as shown in the figure so as to communicate with the air 1o in the hollow space 4; 11 is a fixed grid 2; An antifoam injection pipe (antifoam injection means) is provided on the top wall of the case 1 so as to communicate with a bubble breaking chamber 12 formed by a rotating grate. This is the secondary bubble-breaking chamber that is formed.

One embodiment of the device of the present invention is constructed as described above, and the bubbles flowing into the inflow chamber 9 from the bubble inflow pipe 6 are transferred to the fixed grid 2.
As a result, bubbles larger than the opening of the grid are broken and liquefied, and only gas and microbubbles smaller than the opening of the grid pass through the opening of the fixed grid 2.

The fine bubbles that try to pass through the fixed grid 2 react with a small amount of the defoaming agent injected from the defoaming agent injection pipe 11 and break the bubbles, and at the same time, the bubbles are broken between the brush '5a attached to the rotating grid A and the fixed grid 2. Most of the bubbles are broken due to the shearing force acting on the bubbles and the breaking action of the bubble film by the brush tip, and the bubbles are separated into gas and liquid.

The gas separated in the fixed grating 2 and the antifoaming agent 9 in the rotating grating 6 passes through the gratings of the rotating grating A and enters the air chamber 1 in the hollow space 4.
0 and is exhausted from the exhaust pipe 7. At this time, complete gas-liquid separation is performed in the rotating grating 6 and the hollow tube 40 and the brush 4a by the same action as in the fixed grating 2 and rotating grating B.

The separated liquid flows out from the exhaust pipe 8. In addition, if the foam flowing into this device contains solid matter, the brushes attached to the rotating grate filter and the hollow tube 4 not only break the bubbles but also continuously remove and clean the solid matter adhering to the grating. In addition to preventing clogging, by attaching the brush at a certain angle to the direction of movement, such as in a screw shape, the removed solids can be continuously collected in any direction.

Since the device of the present invention has the above-mentioned configuration 2, according to the present invention, (1) strong shearing force and destructive force can be applied even to high-viscosity foam by using the brush; The foam-breaking effect is good.

(2) Does not require water or liquid circulation.

(3) By using a foam-breaking device and an antifoaming agent in combination, defoaming is more reliable than when using only an antifoaming device or an antifoaming agent, and it is highly effective even against severe foaming. be.

(4) It does not require high-speed rotation or a complicated mechanism, poses no safety problems, and is easy to maintain.

(5) Compared to defoaming using only an antifoaming agent, the amount of antifoaming agent used is extremely small, and the antifoaming effect is equal to or greater than that, which is economical.

Practical effects such as:

In the above embodiment, the rotary grating filter and the plan are attached to the hollow tube 4 in the axial direction as shown in FIG. When mounting on multiple sides along the same line, as shown in Fig. 2 (C), mounting in the form of a screw with an arbitrary pitch, or configuring a combination thereof, etc., as shown in Fig. 2 (C) When installed in the form of a brush screw, it is possible to forcibly feed the separated liquid and removed objects in any direction, and also completely captures bubbles or liquid that try to flow out with the separated gas. It has the advantage of being able to be sent to the source.

In addition, the angle at which the brush is attached to the rotating grating filter and the hollow tube 4 is a straight line extending from the center line of the cylinder to which the brush is attached perpendicular to the center line, as shown in Fig. 6 (A). As shown in Fig. 6 (Bl), it is possible to install the cylinder at an arbitrary angle 2 in the circumferential direction with respect to a straight line extending from the center line of the brush cylinder to be installed at right angles to the center line. As shown in Fig. 3), when the rotating grating is installed so that the inflow side of the bubbles lags behind with respect to the rotating direction, as shown in Fig. 6 (in the case of Al)
Since the deterrent force against bubbles attempting to pass through the rotating lattice is strengthened, there is an advantage that the bubble stays in the inflow chamber for a longer period of time, and the defoaming effect can be enhanced.

For example, if the rotating direction of the rotating grating 6 is counterclockwise as shown in FIG. , an axis y (1 toy y (2) passing between the central axis φ and the free end B of the brush 3a
By installing the brush so that it rotates clockwise with a delay of an angle R, the remaining force F(2) of the rotational force F of the plan is used to remove the bubbles against the inflow pressure E of the bubbles f as shown in Fig. 4. Since it is pushed back in the direction opposite to the inflow, the defoaming effect is enhanced. Note that arrow C in the figure indicates the direction of bubble inflow.

Another embodiment of the present invention shown in FIG. 5 includes a cylindrical case 11 having a vertical center line, and a cylindrical case 11 fixed to the cylindrical case 11 so as to be divided into two by a horizontal plane perpendicular to the center line. A brush 1 that continuously sweeps the fixed grid 12 in contact with the upper surface of the fixed grid 12, and an electric motor 14 that drives the brush 13.
Additionally, the case 11 is provided with an inflow pipe 15 communicating with the lower inflow chamber 17, an exhaust pipe 16 communicating with the upper air chamber 18, and an antifoaming agent injection pipe 19. From the inflow pipe 15 to the inflow chamber 1
The bubbles flowing into the cell 7 are first broken by the fixed grid 12 to form bubbles larger than the grid opening. Further, the fine bubbles that try to pass through the grid are broken by the antifoaming agent, and at the same time, the shear force acting between the grid 12 and the brush 16
6. Due to the destructive force on the foam membrane at the tip, the bubbles are completely ruptured and separated into gas and liquid. The separated liquid passes through the inflow chamber 17 again and is recovered to the original system through the inflow pipe 15.

On the other hand, the separated gas is exhausted from the exhaust pipe 16.

In this example, it is easy to further enhance the defoaming effect by using a plurality of combination stages of the fixed grating 2 and the rotating brush 1 as shown in FIG.

Furthermore, by tilting the fixed grid 12 as shown in FIG. 7, the separated liquid can be collected in a concentrated manner.

In addition, regarding the injection position of the antifoaming agent, in addition to putting it in the inflow chamber 17, it is also possible to put it in any of the stages when several stages are provided.

In addition, it is effective to spray the antifoaming agent through a nozzle or the like or inject it onto the moving track of the rotating brush 16 in order to uniformly disperse the antifoaming agent inside the antifoaming device.

Still another embodiment of the present invention shown in FIG.
A is attached to the endless belt 66 as shown in the figure, and by running the endless belt 6, it is constructed so as to come into sliding contact with the fixed grid 32, and has the same function and effect as the above embodiment. .

In the figure, filter 1 is a case, filter 4 is a wheel for tensioning and driving the endless belt roller, filter 5 is a foam inflow pipe, 66 is an exhaust pipe, filter 7 is a lower inflow chamber, filter 8 is an upper air chamber, and 39 is a The antifoam injection tubes are shown respectively.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view of one embodiment of the present invention, Figs. Figure 6 (Al, (B)
4(A) is a cross-sectional view showing an example of the angle at which the brush is attached to the rotating grating, and FIG. FIG. 5 is an enlarged view of the X part of FIG. 4(A). 6, 7 and 8 are schematic longitudinal sectional views of other embodiments of the invention, respectively. 1.11.31 = Case, 2, 12, 32: Fixed grid, Lo, 16, 6'5 double rotation grid, 5.14: Drive motor, 6, 15. Filter 5: Foam inflow pipe, 7,16
．． Filter 6: Exhaust pipe, 8.15, 35: Drain pipe, 11,
19. Filter 9: Antifoaming agent injection pipe. (2 other people) Figure 4 (A) Figure 4 (B) Figure 5 b Figure 6

Claims (1)

[Claims] The foam or foam mixture is passed through one side of a grid consisting of a plurality of openings, and a brush composed of a plurality of linear members is installed on the outflow side of the grid in contact with each other. Alternatively, a defoaming device characterized in that both parts are movable, and a defoaming agent injection means is not provided at any position of the device to perform gas-liquid separation.