JP2019130452A - Mixer - Google Patents

Abstract

To provide a mixer that can efficiently mix liquid with fluid.SOLUTION: A mixer 1 for mixing fluid with liquid comprises a processing tank 2 having a storage chamber 10 that stores a mixed substance of liquid and fluid therein. A pour-in port 15a of a pour-in path 15 is opened to and an exhaust port 16a of an exhaust path 16 is opened to an inner surface 41 of the storage chamber 10. The exhaust port 16a is arranged below the pour-in port 15a. A height H2 from a lower edge part of the inner surface 41 to a center position of the pour-in port 15a is 0.5 times or more and 0.9 times or less of a height H1 of the inner surface 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mixing apparatus for mixing a fluid with a liquid.

In recent years, in the fields of chemical industry and biological industry, bubbles having a diameter of 100 μm or less called fine bubbles may be generated in a liquid. The micronized bubbles remain in the water for a long period of time without rising and bursting on the water surface. Various functions can be added to the liquid by efficiently mixing, diffusing and dissolving the bubbles in the liquid.
Conventionally, for example, when biological treatment with activated sludge is performed in sewage treatment, oxygen is mixed into the treated water (sewage) in an aeration tank in order to supply oxygen to the activated sludge (microorganisms) that decomposes organic matter. ing.

  And in various water treatments, there is one in which a mixing device for mixing gas into the water to be treated is provided in the tank. As such a mixing apparatus, there is an apparatus in which an injection path is opened on an inner surface of a storage chamber and a discharge path is opened on another inner surface facing the inner surface (see, for example, Patent Document 1).

In such a mixing device, the water to be treated and the gas are injected into the storage chamber from the injection path, and the water to be processed and the gas are mixed in the storage chamber. It is discharged into the aeration tank.
When the water to be treated and the gas are injected from the injection path into the storage chamber, the gas becomes fine bubbles due to the cavitation effect. In this way, by making the gas in the water to be treated into fine bubbles, the amount of gas diffused from the water to be treated into the atmosphere can be reduced.

JP 2000-000563 A

  In the conventional mixing apparatus described above, when the water to be treated and the gas are injected from the injection path into the storage chamber, the water to be processed and the gas swirl in the storage chamber. At this time, it is preferable to increase the oxygen concentration of the treated water by sufficiently swirling the treated water and the gas in the storage chamber and bringing the treated water and the gas into contact with each other.

In order to mix a fluid such as oxygen well with a liquid such as water to be treated, it is preferable to sufficiently vortex the liquid and the fluid in the storage chamber.
However, in the case where the injection path and the discharge path are opened on two opposite surfaces in the storage chamber as in the conventional mixing device, the problem is that the liquid and the fluid are easily discharged from the discharge path without being involved in the vortex. There is.

  An object of the present invention is to solve the above-described problems and to provide a mixing device that can efficiently mix a liquid and a fluid.

  In order to solve the above problems, the present invention is a mixing device for mixing a fluid with a liquid, and includes a processing tank having a storage chamber in which the mixture of the liquid and the fluid is stored. An inlet of an injection path for injecting the liquid and the fluid into the storage chamber opens on the first inner surface of the storage chamber, and a discharge path for discharging the mixture from the storage chamber. The outlet is open. The outlet is disposed below the inlet, and the height from the lower edge of the first inner surface to the center position of the inlet is 0.5 times or more the height of the first inner surface. 9 times or less.

  In the mixing device of the present invention, the liquid and fluid (gas or liquid) injected from the inlet of the first inner surface into the storage chamber abuts on the other inner surface facing the first inner surface, and the flow changes greatly upward. The liquid and fluid vortex in the upper space of the storage chamber, and then pass through the lower space of the storage chamber and are discharged from the discharge port.

  As described above, in the mixing device of the present invention, since the injection port and the discharge port are open on the same surface, the liquid and the fluid injected into the storage chamber are easily discharged from the discharge path without being involved in the vortex. Can be reduced.

  In the mixing device of the present invention, the liquid and fluid injected from the inlet into the storage chamber vortex in the upper space of the storage chamber. Thereby, the vortex of liquid and fluid is formed small, and the kinetic energy (dynamic pressure) of the vortex is increased, so that the vortex can be stably formed.

  Therefore, in the mixing device of the present invention, a vortex can be stably formed in the storage chamber, and the liquid and the fluid can be sufficiently swirled, so that the liquid and the fluid can be mixed well.

Moreover, since the mixing device of the present invention has a simplified structure, the manufacturing cost can be reduced.
Further, in the mixing apparatus of the present invention, since the piping of the injection path and the piping of the discharge path do not protrude on both sides of the processing tank, the installation space can be reduced and the degree of freedom in layout can be increased.

  In the mixing device described above, it is preferable that the distance between the center position of the injection port and the center position of the discharge port is set to 0.1 to 0.7 times the height of the first inner surface. .

In the mixing device described above, it is preferable that the flow rate of the liquid and the fluid injected from the injection port into the storage chamber per minute is 15 times or more the volume in the storage chamber.
If it does in this way, since the liquid and fluid which were inject | poured into the storage chamber from the injection port contact | abuts the other inner surface which opposes a 1st inner surface, a flow will change, A vortex | eddy_current can be formed stably.

  According to the mixing device of the present invention, a vortex flow can be stably formed in the storage chamber with a simplified structure, and the liquid and the fluid can be mixed efficiently.

It is the perspective view which showed the mixing apparatus which concerns on embodiment of this invention. It is the sectional side view which showed the mixing apparatus which concerns on embodiment of this invention. It is the block diagram which showed the mixing apparatus of the Example and comparative example of this invention. It is the table | surface which showed the test result of the Example and comparative example of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The description of the constituent requirements described below is made based on typical embodiments and specific examples, but the present invention is not limited to such embodiments.
In this representative embodiment, a mixing device used for sewage treatment for purifying treated water (sewage) such as domestic wastewater will be described.
In the biological treatment with activated sludge, the mixing apparatus according to the present embodiment supplies oxygen to activated water (microorganisms) that decomposes organic substances in the water to be treated (“liquid” in the claims). In the range of “fluid”).
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

As shown in FIG. 1, the mixing apparatus 1 of the present embodiment includes a processing tank 2 having a storage chamber 10, and an injection path 15 and a discharge path 16 provided in the processing tank 2.
In the mixing apparatus 1, treated water and oxygen are injected into the storage chamber 10 from the injection path 15, and after mixing oxygen with the treated water in the storage chamber 10, treated water in which the treated water and oxygen are mixed (patent claim) The “mixture” in this range is discharged from the storage chamber 10 through the discharge path 16 to an outer tank (not shown) such as an aeration tank or an adjustment tank (drainage tank).

  The processing tank 2 is a hollow rectangular parallelepiped, and the storage chamber 10 is formed inside. The treatment tank 2 includes a pair of upper and lower top plates 20 and a bottom plate 30, a pair of left and right left walls 40 and 50, and a pair of front and rear front walls 60 and 70.

  The top plate 20 and the bottom plate 30 are rectangular flat plates arranged horizontally. The top plate 20 is disposed immediately above the bottom plate 30. The top plate 20 and the bottom plate 30 have the same shape, and are formed longer in the left-right direction than in the front-rear direction. The inner surface 21 of the top plate 20 and the inner surface 31 of the bottom plate 30 face each other in the vertical direction.

  A left side wall 40 and a right side wall 50 are raised at the left and right edges of the bottom plate 30. The left side wall 40 and the right side wall 50 extend vertically upward with respect to the bottom plate 30. The left side wall 40 and the right side wall 50 have the same shape, and are formed longer in the vertical direction than in the front / rear direction.

  A front wall 60 and a rear wall 70 are raised at the front and rear edges of the bottom plate 30, respectively. The front wall 60 and the rear wall 70 extend vertically upward with respect to the bottom plate 30. The front wall 60 and the rear wall 70 have the same shape, and the vertical direction is longer than the horizontal direction.

  The left side wall 40, the right side wall 50, the front wall 60 and the rear wall 70 form a rectangular tube-shaped body portion 80. The lower surface of the trunk portion 80 is blocked by the bottom plate 30, and the upper surface of the trunk portion 80 is blocked by the top plate 20.

The storage chamber 10 is a rectangular parallelepiped space whose outer periphery is surrounded by the body portion 80 and whose upper surface and lower surface are closed by the top plate 20 and the bottom plate 30.
A pair of upper and lower inner surfaces 21 and 31, a pair of left and right inner surfaces 41 and 51, and a pair of front and rear inner surfaces 61 and 71 are formed on the inner surface of the storage chamber 10.

  The inner surface 41 (the “first inner surface” in the claims) of the left side wall 40 and the inner surface 51 of the right side wall 50 face each other in the left-right direction. The inner surface 61 of the front wall 60 and the inner surface 71 of the rear wall 70 face each other in the front-rear direction.

The pair of inner surfaces 41 and 51 facing left and right and the pair of inner surfaces 61 and 71 facing front and rear are arranged in a rectangular tube shape.
In the mixing apparatus 1 of the present embodiment, the distance between the inner surface 41 of the left side wall 40 and the inner surface 51 of the right side wall 50 is longer than the distance between the inner surface 61 of the front wall 60 and the inner surface 71 of the rear wall 70. Is formed.
Thus, in the storage chamber 10 of this embodiment, the width L in the left-right direction is formed larger than the width W (depth) in the front-rear direction. Thereby, the space in the storage chamber 10 is formed in a flat rectangular parallelepiped that is wide in the left-right direction and narrow in the front-rear direction.

  In the treatment tank 2 of the present embodiment, as shown in FIG. 2, an injection path 15 for injecting water to be treated and oxygen into the storage chamber 10 and a discharge for discharging the treated water from the storage chamber 10. Road 16 is provided.

  The injection path 15 is configured by an injection port 15 a that opens to the inner surface 41 of the left side wall 40, an injection hole 15 b that communicates with the injection port 15 a, and an injection tube 15 c that is provided on the outer surface of the left side wall 40.

The injection port 15 a is open to the inner surface 41 of the left side wall 40. The injection port 15a is a circular opening (see FIG. 1). The injection port 15a is disposed at the center in the front-rear direction of the inner surface 41 of the left side wall 40 (see FIG. 1).
The injection hole 15b is a circular hole that communicates with the injection port 15a, and penetrates the left side wall 40 in the left-right direction.

The center position of the injection port 15a of this embodiment is disposed above the center of the height H1 of the inner surface 41 of the left side wall 40. That is, the injection port 15a of the present embodiment opens at the top of the inner surface 41 of the left side wall 40.
The height H2 from the lower edge of the inner surface 41 of the left side wall 40 to the center position of the injection port 15a is preferably not less than 0.5 times and not more than 0.9 times the height H1 of the inner surface 41 of the left side wall 40. More preferably, it is 0.55 times or more and 0.7 times or less.
In the present embodiment, the height H2 from the lower edge of the inner surface 41 of the left side wall 40 to the center position of the injection port 15a is 0.6 times the height H1 of the inner surface 41 of the left side wall 40.

The tip of the injection tube 15c is attached to the outer surface of the left side wall 40, and the injection tube 15c communicates with the injection hole 15b. The base end portion of the injection pipe 15c is connected to a supply device (not shown), and water to be treated and high-concentration oxygen are supplied together from the supply device to the injection pipe 15c. And to-be-processed water and oxygen are inject | poured in the storage chamber 10 from the injection port 15a through the injection hole 15b from the injection pipe 15c.
The flow rate (L / min) of water to be treated and oxygen injected into the storage chamber 10 from the inlet 15a is preferably 15 times or more the volume (L) in the storage chamber 10, and the storage chamber It is more preferable that it is 20 times or more of the volume in 10.

  The discharge path 16 is configured by a discharge port 16 a that is open to the inner surface 41 of the left side wall 40, a discharge hole 16 b that communicates with the discharge port 16 a, and a discharge pipe 16 c that is provided on the outer surface of the left side wall 40.

The discharge port 16 a opens to the inner surface 41 of the left side wall 40. The discharge port 16a is a circular opening (see FIG. 1). The discharge port 16a is disposed below the injection port 15a. Moreover, the discharge port 16a is arrange | positioned in the center part of the front-back direction of the inner surface 41 of the left side wall 40 (refer FIG. 1).
The discharge hole 16b is a circular hole communicating with the discharge port 16a, and penetrates the left side wall 40 in the left-right direction.

The distance H3 between the center position of the injection port 15a and the center position of the discharge port 16a of the present embodiment is not less than 0.1 times and not more than 0.7 times the height H1 of the inner surface 41 of the left side wall 40. Preferably, it is 0.4 times or more and 0.6 times or less.
In the present embodiment, the distance H3 between the center position of the inlet 15a and the center position of the outlet 16a is 0.6 times the height H1 of the inner surface 41 of the left side wall 40. The discharge port 16 a of the present embodiment opens at the lower part of the inner surface 41 of the left side wall 40.

  The distal end of the discharge pipe 16c is attached to the outer surface of the left side wall 40, and the discharge pipe 16c communicates with the discharge hole 16b. The base end portion of the discharge pipe 16c is connected to a pipe to the next step (for example, an outer tank such as an aeration tank or an adjustment tank). And the treated water in the storage chamber 10 is sent to the following process from the discharge port 16a through the discharge hole 16b and the discharge pipe 16c.

Next, the process which mixes to-be-processed water and oxygen using the mixing apparatus 1 of this embodiment is demonstrated.
First, as shown in FIG. 2, water to be treated and high-concentration oxygen are supplied from a supply device (not shown) to the injection pipe 15c, and the water to be treated and oxygen are injected into the storage chamber 10 from the inlet 15a. To do.

  When the water to be treated and oxygen are injected into the storage chamber 10 from the injection port 15a, the water to be treated and oxygen come into contact with the inner surface 51 of the right side wall 50 and the flow greatly changes upward. Then, the water to be treated and oxygen vortex in the vertical direction in the upper space of the storage chamber 10, pass through the lower space of the storage chamber 10, and the processed water is discharged from the discharge port 16 a of the inner surface 41 of the left side wall 40. The Then, the treated water is sent to the next step through the discharge pipe 16c.

  In the mixing apparatus 1 of the present embodiment as described above, since the inlet 15a and the outlet 16a are not formed on opposite surfaces, the water to be treated and oxygen are discharged from the outlet 16a without being caught in the vortex. The problem of being easily done can be reduced. As a result, the water to be treated and oxygen flow through a long path in the storage chamber 10, and the behavior of the water to be treated and oxygen in the storage chamber 10 is greatly disturbed, so that the water to be treated and oxygen are sufficiently Since it contacts, to-be-processed water and oxygen can be mixed well.

  Moreover, in the mixing apparatus 1 of this embodiment, the to-be-processed water and oxygen which were inject | poured in the storage chamber 10 from the inlet 15a will swirl in the upper space of the storage chamber 10. FIG. Accordingly, the vortex is formed small and the kinetic energy (dynamic pressure) of the vortex is increased, so that the vortex can be stably formed.

  Further, in the mixing apparatus 1 of the present embodiment, the distance H3 between the center position of the inlet 15a and the center position of the outlet 16a is 0.1 times or more and 0.7 times the height of the inner surface 41 of the left side wall 40. By setting the following, the vortex can be stably formed.

  Further, in the mixing apparatus 1 of the present embodiment, the flow rate of water to be treated and oxygen injected into the storage chamber 10 from the injection port 15 a is 15 times or more the volume in the storage chamber 10. Thereby, since the to-be-processed water and oxygen which were inject | poured in the storage chamber from the injection port 15a contact | abut to the inner surface 51 of the right side wall 50, a flow changes, a vortex | eddy_current can be formed stably.

  Therefore, in the mixing apparatus 1 of this embodiment, since the oxygen concentration of treated water becomes high, the decomposition | disassembly capability of the organic substance by activated sludge can be improved.

Moreover, since the mixing apparatus 1 of this embodiment is a simplified structure, manufacturing cost can be reduced.
Moreover, in the mixing apparatus 1 of this embodiment, since the injection pipe 15c connected to the injection port 15a and the discharge pipe 16c connected to the discharge port 16a are not linearly arranged on both sides of the processing tank 2, the mixing apparatus The installation space of 1 can be made small, and the freedom degree of the layout of the mixing apparatus 1 can be raised.

Next, examples and comparative examples in which the effects of the present invention have been confirmed will be described.
As shown in FIG. 3, the mixing device 1 of the example and the comparative example has four openings A to D formed on the inner surface 41 of the left side wall 40. Each of the openings A to D is a circular opening.
The height from the lower edge of the inner surface 41 of the left side wall 40 to the center position of the opening A is 0.7 times the height of the inner surface 41 of the left side wall 40.
The height from the lower edge of the inner surface 41 of the left side wall 40 to the center position of the opening B is 0.6 times the height of the inner surface 41 of the left side wall 40.
The height from the lower edge of the inner surface 41 of the left side wall 40 to the center position of the opening C is 0.4 times the height of the inner surface 41 of the left side wall 40.
The opening D is disposed at the lower end of the inner surface 41 of the left side wall 40.

In the embodiment, the opening A or the opening B is set as an injection port, and the openings B to D below the opening A or the opening B are set as discharge ports. Moreover, in the comparative example, the opening part C is set as the injection port, and the opening part D is set as the discharge port.
And the amount of dissolved oxygen of the treated water when the treated water and oxygen were injected into the storage chamber 10 from the openings A to C set at the inlet at a flow rate of 73 to 75 L / min was measured.

In Examples and Comparative Examples, the amount of oxygen dissolved in the water to be treated was determined from the difference in dissolved oxygen concentration between the water to be treated and the treated water.
In Examples and Comparative Examples, the amount of dissolved oxygen in the treated water was measured using a value obtained by multiplying the flow rate of the treated water discharged from the discharge port by the amount of increase in dissolved oxygen value (DO value).

  As shown in the measurement result of FIG. 4, when the height of the inlet is in the range of 0.5 to 0.9 times the height of the inner surface 41, the height of the inlet is that of the inner surface 41. Compared with the comparative example which is 0.4 times the height, the amount of dissolved oxygen is significantly increased. That is, it has been found that by arranging the inlet in the above-described height range, the water to be treated and oxygen can be mixed efficiently, and the oxygen concentration of the treated water becomes high.

As mentioned above, although this embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning, it can change suitably.
In this embodiment, as shown in FIG. 1, the mixing apparatus 1 used for the sewage treatment has been described, but the types of liquid and fluid that can be mixed using the mixing apparatus of the present invention are not limited. For example, another liquid may be mixed with the liquid.

  In the mixing apparatus 1 of the present embodiment, the shapes and sizes of the storage chamber 10, the inlet 15a, and the outlet 16a are not limited, and are set as appropriate according to the required processing capacity.

  In the mixing apparatus 1 of the present embodiment, the inlet 15a and the outlet 16a are disposed on the inner surface 41 of the left side wall 40. The inlet 15a and the outlet 16a are connected to the inner surface 51 of the right wall 50 and the inner surface of the front wall 60. 61 or the inner surface 71 of the rear wall 70.

  In the mixing apparatus 1 of the present embodiment, the injection port 15a and the discharge port 16a are arranged in the center part in the front-rear direction of the inner surface 41 of the left side wall 40. However, the injection port 15a and the discharge port 16a are arranged on the inner surface 41 of the left side wall 40. You may arrange | position in the front part or rear part. Further, the inlet 15a and the outlet 16a may be shifted in the front-rear direction.

  According to the mixing apparatus of the present invention, for example, it can be installed in a drainage (water) facility such as a building pit, a manhole or a factory provided in the basement of a building. Also, in the field of utilizing microbubbles, for example, promotion of growth of fishery products and agricultural and livestock products, maintenance of freshness, improvement of food flavor and texture, cleaning and peeling of precision machinery and electronic parts, medical and pharmaceutical products, cosmetics, etc. It can be suitably used in various applications.

DESCRIPTION OF SYMBOLS 1 Mixing apparatus 2 Processing tank 10 Reservoir 15 Injection path 15a Inlet 15b Inlet hole 15c Inlet pipe 16 Outlet path 16a Outlet 16b Outlet hole 16c Outlet pipe 20 Top plate 30 Bottom plate 40 Left side wall 41 Inner surface 50 Right side wall 51 Inner surface 60 Front wall 70 Rear wall 80 Body

Claims (3)

A mixing device for mixing a fluid with a liquid,
A treatment tank having a storage chamber in which a mixture of the liquid and the fluid is stored;
On the first inner surface of the storage chamber,
An inlet of an injection path for injecting the liquid and the fluid into the storage chamber opens,
A discharge port for discharging the mixture from the storage chamber is open,
The outlet is disposed below the inlet;
The height from the lower edge of the first inner surface to the center position of the inlet is 0.5 to 0.9 times the height of the first inner surface. The mixing device according to claim 1,
The distance between the center position of the said inlet and the center position of the said discharge outlet is 0.1 to 0.7 times the height of said 1st inner surface, The mixing apparatus characterized by the above-mentioned. A mixing device according to claim 1 or claim 2, wherein
The mixing apparatus characterized in that the flow rate of the liquid and the fluid injected from the inlet into the storage chamber is 15 times or more the volume of the storage chamber.

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