JPH05146236A - Apparatus for raising aquatic organism - Google Patents

Abstract

PURPOSE:To increase the amount of dissolved oxygen in water used for raising aquatic organisms by vertically installing a turning type aerator equipped with an air inlet under a lower opening of a cylindrical unit having helical plates fixed on the inner wall. CONSTITUTION:Air is released from an air inlet 66 under a cylindrical unit 60 having helical plates 61 fixed on the inner wall into water for raising. The air is finely divided by turning in the cylinder and its lifting speed is increased in a gradually constricted cylindrical unit 60' to feed fine bubbles into the tank for raising aquatic organisms.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an apparatus for growing aquatic animals such as fish and shellfish or aquatic plants such as kelp and young cloth, and particularly supplies fine bubbles of oxidizing gas, carbon dioxide gas, etc. to the growing water, In addition, the present invention relates to an aquatic organism growing device including an aerator capable of forming a strong and stable circulating flow in the growing water.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
For aeration in aquatic organism growing equipment, a method of subdividing bubbles by pressurizing and ejecting air into the growing water from the annular or plate-shaped aerator pores installed in the growing tank, rotary blades, bubble jets, etc. There is a method in which air is introduced into the growing water flow in which the shearing force has been formed by subdividing it.

In aeration using an aerator having these functions, basically, necessary adjustments are made depending on the amount of air fed and the number of aerators installed. However, in order to develop a high-performance aquatic organism breeding apparatus for the purpose of energy-saving advanced aquatic organism breeding, it is necessary to generate a large amount of fine oxidizing gas bubbles and to control the amount of bubbles generated. is there.

However, most of the above-mentioned aeration methods are the air diffusion method by jetting or the method in which bubbles are generated by shearing on the rotary blades and the projections, so that they have the following various drawbacks. For example, in the ejection method from an air diffuser, an air diffuser, or a cylinder, no matter how fine pores are provided there, the surface tension of the bubbles when they eject from the pores results in about several mm. However, there is a drawback that large bubbles having a diameter of 10 are generated, and it is impossible to generate bubbles smaller than that. Further, as the drawbacks of such an air diffusion method, there are problems such as clogging that occurs during long-term operation and increase in power cost. On the other hand, in the method of subdividing air into the growing water flow in which a shearing force is formed by a rotating blade or a bubble jet, a high rotation speed is required to generate cavitation, and its power cost is reduced. There are problems such as blade corrosion and vibration that rapidly progress with the occurrence of cavitation, and there is also a problem that the generation of fine bubbles is small.

In the aerator of the conventional apparatus for growing aquatic organisms having the above-mentioned drawbacks and problems, since the generation amount of fine bubbles is small, the residence time of the bubbles in the growing water is shortened, and the bubbles enter the growing water. The increase in the amount of dissolved oxygen could not be expected. Furthermore, since the diameter and amount of the fine bubbles cannot be easily controlled, there is a problem that the growth water cannot be efficiently prepared.

The aerator as described above has the following problems. That is, it is not possible to uniformly generate a large amount of fine bubbles having a diameter of 1 mm or less and up to about several tens of μm, and it is not possible to achieve a dramatic promotion of gas-liquid renewal. It is impossible to easily and mechanically control the diameter, distribution, and generation amount of the bubbles as described above. Appropriately arranging the in-pipe flow into which the air bubbles have been sucked cannot provide the necessary circulation flow formation and agitation action in the aquatic organism growing apparatus. In the method in which the gas-liquid two-phase flow collides with the rotating blades and protrusions, fish and aquatic small organisms are destroyed, which hinders the formation and maintenance of the environment necessary for aquatic organisms to grow. The continuous aeration causes clogging and reduces the aeration efficiency, which increases the pressure loss. Therefore, long-term continuous operation and significant reduction in operating costs cannot be achieved. The shape of the device, including the aerator that supplies air bubbles and the compressor, is large, and there are restrictions on the installation, so miniaturization cannot be achieved. It is difficult to perform optimal control of aquatic organism growth by agitation in the aquatic organism growth tank, adjustment of dissolved oxygen amount, and the like by controlling the diameter, distribution, and generation amount of bubbles.

[0007]

Means and Actions for Solving the Problems As a result of intensive studies to solve the above-mentioned problems of the prior art, the present inventors have provided an energy-saving aerator capable of easily supplying fine bubbles to growing water. We developed aquatic organism breeding equipment. That is, the present invention is an aquatic organism growing apparatus as described below.
A first aspect of the present invention provides a swirling aerator, which comprises a cylindrical body having a spiral plate fixed to an inner wall thereof and an air supply port arranged at a slight interval immediately below the lower opening of the cylindrical body, to grow aquatic organisms. It is an aquatic organism growing device characterized by being hung vertically in a tank, and the second invention is the first invention, characterized in that the whole or upper part of the cylindrical body is a tapered cylinder. The aquatic organism growing apparatus according to the third aspect of the invention is the aquatic organism growing apparatus according to the first aspect or the second aspect of the invention, characterized in that the spiral plate is a multi-screw plate. The invention according to claim 1 is the aquatic organism growing apparatus according to any one of the first to third inventions, characterized in that a swivel plate support column is provided on the central axis of the cylindrical body, and the fifth invention is the lower cylindrical body. The water according to any one of the first to fourth inventions, characterized in that the opening is reduced. A sixth aspect of the present invention is a living organism growing apparatus, and the sixth invention is characterized in that a plurality of spiral plates are fixed to the inner wall of the cylindrical body, and the lead angle is 0.7 to 1.3. The aquatic organism growing apparatus according to any one of the fifth inventions.

In the above invention, firstly, according to the swirling method of the present invention, the pressure loss becomes much smaller than that of the conventional jet type aerator, and the efficiency of bubble generation in the growing water is dramatically improved. To do. Secondly, in the conventional jetting method, even if the diameter of the pores of the irregular porous tube made of ceramics or the like was reduced to about μm, the diameter of the bubbles generated therefrom was about several mm on average. According to the swirl type aerator of the present invention, the average diameter of the fine air bubbles generated is expressed in several tens.
The size can be reduced from 0 μm to several tens of μm.
Therefore, the contact area between the growing water and the oxidizing gas bubbles can be increased to about 10 to 100 times that of the conventional method, and the residence time of the bubbles can be increased to 10 to 100 times, resulting in the aquatic organism growing water. The amount of dissolved oxygen can be dramatically increased.

Thirdly, by adopting the taper cylinder, the flow velocity of the rising gas-liquid two-phase flow is enhanced, and a strong and stable circulating flow can be formed in the water tank. Moreover, since there is no particular protrusion in the tapered cylinder, there is almost no pressure loss. Further, due to the reduction of the flux due to the increase of the swirling property, there is almost no influence of the pressure loss in the gradually contracting cylindrical body. Fourthly, in the conventional method in which aeration is performed by the collision with the high-speed rotating blade or the protrusion, there is a problem that aquatic organisms are destroyed, but according to the present invention, such a problem hardly occurs. Fifth, in the case where the lower opening of the cylindrical body is reduced, the airlift effect due to the rise of gas is further improved, and the residue and the like that settle near the bottom of the water tank are rolled up, and the decay near the bottom of the water tank is prevented. Therefore, the purification process by aeration can be further improved. Sixth,
The air mass ejected from the air supply pipe arranged below is atomized in the ascending and entraining process in the cylindrical body, so that the aerator is hardly clogged.

[0010]

EXAMPLES Some examples of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration explanatory diagram of an aquatic organism growing apparatus including a swirl type aerator according to the present invention. In the figure, 2 is an aquatic organism growing water tank, 21 is a growing water tank drainage outlet, 22 is a drainage outlet pipe, 3 is a blower or compressor, 5 is a growing water tank drainage purification device, 51 is a filter cloth, 52 is filtered sand, and 6 is A swirl type aerator, 65 is a gas transfer pipe for transferring aquatic organism growing gas, V ₁ and V ₂ are valves, and 4 is a water pump. In the apparatus of the present embodiment, the growth gas is supplied from the end of the growth gas transfer pipe 65 to the swirl type aerator 6 vertically provided in the growth water 1 at the bottom of the water tank 2 to dissolve the dissolved oxygen in the growth water 1. The amount is greatly increased, and the supply thereof forms a circulating flow in the growing water 1.

Since the discharge from aquatic organisms floats up in the growing tank 2, the drainage containing the discharged water is taken out from the growing tank drainage outlet 21 through the drainage outlet pipe 22 to the growing tank drainage purification device 5. And introduce. Growth tank drainage purification device 5
Is divided into two tanks on the left and right by the filter cloth 51 and the filter sand 52 on the middle wall, and the wastewater introduced into the right tank enters the left tank after being filtered by the middle wall. It is supplied to the growing water tank 2 via the water feed pump 4 valve V ₁ . Then, while the air introduced from the blower or the compressor 3 through the valve V ₂ and the growth gas supply pipe 65 passes through the swirl aerator 6, it becomes fine bubbles and is discharged into the growth water 1. Along with this, a circulating flow is continuously formed in the device, so the amount of dissolved oxygen in the growing water greatly increases due to the increase in the contact surface area due to the fine bubbles and the prolonged floating time in the liquid due to the fine bubbles. However, the environment for growing aquatic organisms is improved.

In the above-mentioned aquatic organism growing apparatus, since a cylindrical body having a spiral plate fixed inside is used as an aerator as shown in FIG. 2 and thereafter, first of all, a large pressure loss energy as in the conventional method using a diffuser pipe is used. Because of the method of subdividing gas-liquid using shearing force without using air bubbles, bubbles with extremely small diameters and relatively large bubbles are generated instead of the bubbles with large diameters that occur in the case of diffuser tubes. Two types of bubbles of diameter are generated. Therefore, the contact surface area between the bubbles and the growing water is increased, and the dissolution efficiency of the gas in water is greatly improved, and as a result, it is possible to grow aquatic organisms such as seafood and seaweed with high efficiency. .. FIG. 2 is a partially cutaway perspective view of the cylindrical body portion of the swivel aerator according to the aquatic organism growing apparatus of the embodiment of the present invention. In FIG. 2, 60 is a cylindrical body,
61 ... Is a spiral plate, 62 is a spiral plate supporting column, and 63 is a gas-liquid introducing part with a lower opening reduced.

FIG. 3 is a partially cutaway perspective view of a swirl type aerator according to the aquatic organism growing apparatus of the embodiment of the present invention.
4A and 4B are a plan view and a vertical sectional view. Here, gas (usually air) is supplied from the gas supply pipe 65 and supplied from the air supply port 66 to the cylindrical body 60 of the swivel aerator attached to the support 64. The support 64, the gas introduction portion 63, and the gas supply pipe 65 are fixed to each other by adhesion or welding with a strong adhesive or the like, and they are fixed to the aerator mounting base 67 by a mounting U band 68. Has been. In the figure, when the growing gas flows in the gas supply pipe 65 in the direction of the arrow, it becomes an air mass at the air supply port 66 and is discharged into the growing water. This air mass is introduced into the gas-liquid introducing section 63 in the process of rising due to its buoyancy, and the spiral plate 6
In the process of increasing the swirl while rising toward 1 ..., the particles are atomized by the shearing force formed between the swirling water for growth in the cylindrical body. In this example, the spiral plates 61 ...
The sheets are attached, and the lead angle β is 1.0. Usually, the lead angle β is preferably about 0.7 to 1.3. Then
The gas-liquid two-phase flow containing the generated fine bubbles is reduced by the contracting cylindrical body 6
In 0 ′, the rising speed is further increased, a strong and stable circulating flow is continuously formed in the biological growth tank, and the fine bubbles are transported to the whole water area.

FIG. 5 is a distribution chart of bubble diameters, bubble generation rates, etc. of bubbles generated by the conventional single tube aeration type aerator and bubbles generated by the aerator of the embodiment. The measurement conditions in this case are as follows.

When the aerator according to the present invention is installed in the biological growth water, it is preferable that a large number of aerators are arranged in the growth water area. For example, a set of 3 to 5 pieces is arranged at appropriate intervals. It is also possible to generate a stable and strong circulating flow in the growing water area by arranging it near the center of the bottom of the growing water area and near the right side.

[0014]

As described above in detail in the embodiments and the like, according to the present invention, many excellent effects as described below are exhibited. (1) According to the aerator of the present invention, the pressure loss is considerably smaller than that of the conventional jet type aerator, and the bubble generation efficiency in the growing water is dramatically improved. (2) In the conventional ejection method, even if the diameter of the pores of the irregular porous tube made of ceramics or the like is reduced to about micron, the diameter of the bubbles generated therefrom is about several millimeters on average. According to the swirl type aerator of the present invention, the average diameter of the fine bubbles generated is from several 100 μm to several 10 μm.
Can be miniaturized. Therefore, the contact area between the growing water and the bubbles such as the oxidizing gas can be extremely increased,
Moreover, the residence time of the bubbles in the growing water can be significantly increased, and as a result, the amount of dissolved oxygen in the growing water can be dramatically increased. (3) By adopting the taper cylinder, the ascending gas-liquid two-phase flow velocity is enhanced, and a strong and stable circulating flow can be formed in the water tank, which is a preferable environment for growing aquatic organisms. At this time, there is almost no pressure loss in the tapered cylinder. (4) In particular, in the case where the opening at the lower part of the cylindrical body is contracted, in order to further improve the air lift effect due to the rise of gas, the residue that precipitates near the bottom of the growing water area is rolled up to prevent spoilage near the bottom of the water. can do. (5) In the conventional method in which aeration is performed by the collision with the high-speed rotating blade or the protrusion, there is a problem that aquatic organisms are destroyed, but according to the present invention, such a problem hardly occurs. (6) Since the air mass ejected from the air supply port of the swirl type aerator according to the present invention is atomized in the ascending and entraining process, there is almost no clogging in the aerator.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a configuration of an aquatic organism growing apparatus including a swirl type aerator according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a cylindrical body of a swivel aerator according to an embodiment.

FIG. 3 is a partially cutaway perspective view of the swivel aerator of the embodiment.

4A and 4B are a plan view and a vertical cross-sectional view of a swivel aerator of an embodiment.

FIG. 5 is a bubble diameter / bubble distribution chart of bubbles generated by a conventional single-tube aeration type aerator and a swirl type aerator according to an embodiment of the present invention.

[Explanation of symbols]

1: Aquatic organism breeding water 2: Water tank 21: Breeding tank drainage outlet 22: Drainage outlet pipe 3: Blower or compressor 4: Pump 5: Breeding tank drainage purification device 51: Filter cloth 52: Filtered sand 53: Purified water transfer pipe 6: Revolving aerator 60: Cylindrical body 60 ': Reduced cylindrical body 61: Spiral plate 62: Spiral plate support column 63: Gas-liquid introduction part 64: Support 65: Gas supply pipe 66: Air supply port 67: Aerator mount 68: U-band for mounting V ₁ , V ₂ : Valve

Claims (6)

[Claims] 1. A swirling aerator comprising a cylindrical body having a spiral plate fixed to an inner wall thereof and an air supply port arranged at a slight distance immediately below the lower opening of the cylindrical body. An apparatus for growing aquatic organisms, characterized by being laid vertically inside. 2. The apparatus for growing aquatic organisms according to claim 1, wherein the whole or upper part of the cylindrical body is a gradually contracting cylindrical body. 3. The aquatic organism growing apparatus according to claim 1, wherein the spiral plate has a multi-row structure. 4. The apparatus for growing aquatic organisms according to claim 1, wherein a swivel plate support column is provided on the central axis of the cylindrical body. 5. The aquatic organism growing apparatus according to claim 1, wherein the lower opening of the cylindrical body is reduced. 6. The aquatic plant according to claim 1, wherein the spiral plate fixed to the inner wall of the cylindrical body is a plurality of spiral plates and has a lead angle of 0.7 to 1.3. Biological equipment.