JP2001000890A - High efficiency gas dissolving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently increase the quantity of dissolved oxygen in the water of a culturing pond, particularly in the water near under soil, on which organic materials such as excrement is deposited, by utilizing the shear force of water generated in an expanded diameter nozzle having a collision member and the collapse impact force of cavitation to efficiently micronize air. SOLUTION: A high efficiency gas dissolving device 10 has a nozzle main body 11 and a collision plate 18 arranged in the tip thereof so as to have a certain gap. The nozzle main body 11 has a water introducing part 14 for introducing high pressure water from a water ejecting port 12 and discharging from a discharge port 13. Further, a gas pipe line 16 is provided through a gas introducing port 15 in an orifice part 22 provided in the downstream side of the water introducing part 14 and air is incorporated in the high pressure water passed through the water introducing part 14. The base side of the conical expanded diameter nozzle part 17 having a diameter expanded toward the tip side (the opening angle is 40-90 deg.) is integrally connected to the water introducing part 14. The collision plate 18 is inclined downward from the center toward the radius direction and the periphery is fixed to the nozzle main body 11 with 4 pieces of supporting rods 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for efficiently miniaturizing a gas by utilizing the shearing force and cavitation of water generated in a diameter-enhancing nozzle portion provided with a collision member, and to reduce water in a culture pond, particularly remaining food and excrement. The present invention relates to a device for efficiently increasing the amount of dissolved oxygen in water near the bottom soil where organic matter such as deposits accumulates.

[0002]

2. Description of the Related Art In recent years, in aquaculture ponds, a large amount of fish and shellfish are bred in a narrow space in order to increase the breeding efficiency, and their overdensity is increasing. For this reason, the dissolved oxygen concentration (oxygen concentration in water) decreases and the growth rate also decreases.
In addition, the residual food and excrement accumulate as organic matter on the bottom soil, and a large amount of death occurs due to infection with pathogenic bacteria such as Vibrio bacteria and PAV virus generated in the sediment. In particular, only about 20% of the mixed feed (400,000 tons per year in Japan) such as fish meal that is given as bait is consumed by fish and shellfish, and the remaining 80% is deposited on the bottom soil. In addition, chemical pesticides such as antibiotics are used in the diet as a countermeasure against pathogenic bacteria, but their effectiveness is only when the bred fish and shellfish have sufficient resistance (immunity), In the situation, the resistance is weak and the effect has not improved. For this reason, in order to decompose and purify the sediment, a purification action by the aerobic underwater microorganisms is required, so that sufficient oxygen is indispensable for the activities of the microorganisms. Recently,
Research and development of a viral bacterial agent called a biopesticide from a pathological standpoint is underway, but the aquaculture industry has demanded the establishment of sediment treatment technology from the viewpoint of increasing the oxygen concentration in water. Have been.

[0003]

However, conventionally,
Regarding the method of supplying oxygen in places where oxygen is required, such as aquaculture ponds, the water turbine method, the diffuser pipe (injecting high-pressure air into a porous plate or cylinder), the jet water flow method, etc. There is no oxygen dissolution efficiency of 20% or more,
The design is designed to emphasize the water circulation of the entire pond rather than the generation of bubbles. In this case, the amount of dissolved oxygen at the bottom of the pond cannot be increased, so that the activity of microorganisms that decompose and purify sedimentary organic matter is not activated, and a large amount of death due to disease occurs. As a result, the water in the pond has to be replaced all at once. In addition, since the water in the aquaculture pond is replaced at a time, oxygen-deficient water containing sediment flows out into rivers and the sea, and there is a concern about the occurrence of environmental pollution. For the above reasons, there is an increasing demand for the development of new devices. The present invention has been made in view of such circumstances, and uses the shearing force of water and the collapse impact force of cavitation to efficiently make air finer so that water in a culture pond, particularly organic matter such as residual food and excrement, is deposited. It is an object of the present invention to provide a highly efficient gas dissolving apparatus that efficiently increases the amount of dissolved oxygen in water in the vicinity of a bottom soil and that has good economic efficiency.

[0004]

According to the present invention, there is provided a high-efficiency gas dissolving apparatus according to the present invention, wherein a water introduction section for discharging high-pressure water introduced from a water injection port from a water discharge port, and a gas introduction port provided in the water introduction section. A gas pipe that mixes gas into the high-pressure water by an ejector action, and is integrally connected to a base side of the water-guiding portion, expanded in diameter toward a front side, and positively acted by a high-pressure water flow discharged from the discharge port. A nozzle body having a large-diameter nozzle part for generating cavitation, and a water mixture containing microbubbles discharged from the large-diameter nozzle part is disposed with a gap further ahead of the nozzle body. And a collision member. Thereby, cavitation can always be made to stand in the internal space of the enlarged diameter nozzle portion. Further, by providing the collision member, fine air bubbles can be uniformly diffused around the high-efficiency gas dissolving device. Here, the gas includes air including oxygen and ozone in addition to air, and the present invention can be applied to other gases.

[0005] In the high-efficiency gas dissolving apparatus according to the present invention, the enlarged diameter nozzle may have a truncated cone shape and an opening angle in a range of 40 to 90 degrees. Thereby, the cavitation can always be kept inside the enlarged diameter nozzle portion without going out of the internal space of the enlarged diameter nozzle portion. In the high-efficiency gas dissolving device according to the present invention, the collision member may be inclined downward in the radial direction from the center, and the periphery may be fixed to the nozzle body by a plurality of support rods. is there.
As described above, since the collision member is inclined downward in the radial direction from the center, the bubbles of the fine gas present in the inner space between the enlarged diameter nozzle portion and the collision member are removed by the high-efficiency gas. It can be uniformly distributed around the melting device. In addition, since the collision member is fixed around the nozzle body by a plurality of support rods, the distance between the nozzle body and the collision member depends on the flow rate of the high-pressure water fed to the injection port and the scale of the high-efficiency gas dissolving device. It can be adjusted.

[0006] In the high-efficiency gas dissolving apparatus according to the present invention, the enlarged diameter of the enlarged nozzle may be smoothly rounded. The radius of curvature in this case is, for example, 1
It can be 0 to 50 mm. Thereby, the gas bubbles of the fine gas present in the internal space of the enlarged diameter nozzle portion can smoothly move around the high-efficiency gas dissolving device. Further, in the high-efficiency gas dissolving apparatus according to the present invention,
The water guide is provided with a throttle on the downstream side, and the gas inlet may be provided in the throttle. This makes it possible to make the velocity distribution around the central portion and the surroundings of the high-pressure water discharged from the discharge port through the water guide portion of the nozzle body uniform, and also to increase the pressure of the gas mixed into the water. Can release water.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a side sectional view of a high-efficiency gas dissolving apparatus according to an embodiment of the present invention, and FIGS. 2A and 2B are a front view and a side sectional view of an impact plate of the high-efficiency gas dissolving apparatus, respectively. FIGS. 3A and 3B are an operation explanatory view of the high-efficiency gas dissolving apparatus and a configuration diagram of the high-efficiency gas dissolving apparatus, respectively.

As shown in FIGS. 1 to 3, a high-efficiency gas dissolving apparatus 10 according to an embodiment of the present invention
1 and a collision plate 18, which is an example of a collision member, disposed with a gap on the front side of the nozzle body 11.
Hereinafter, these will be described in detail. Nozzle body 11
Introduces high-pressure water accelerated to 20 to 50 m / sec, which is sent through a pump 19 (see FIG. 3A), which is an example of a water transport means, from a water inlet 12 and discharges it from a water outlet 13. It has the water guide part 14 which does. 1 and 3
As shown in (B), a gas pipe 16 is provided at a narrowing portion 22 provided on the downstream side of the water guide portion 14 through a gas inlet 15, and high-pressure water passing through the water guide portion 14 is supplied with gas. The air which is an example is mixed. That is, a negative pressure phenomenon occurs as the high-pressure water rapidly rises in the squeezing portion 22, and the air naturally sucked (ejected) from the gas pipe 16 in the discharge direction of the high-pressure water is mixed with the high-pressure water. You.

The base of a frustoconical large-diameter nozzle portion 17 whose diameter is increased toward the front side (opening angle is 40 to 90 degrees) is integrally connected to the water guide portion 14. Nozzle body 11
The high-pressure water flow mixed with the air discharged from the water discharge port 13 generates cavitation actively in the internal space of the enlarged diameter nozzle portion 17. That is, when the flow velocity of the high-pressure water flow (jet) increases, the static pressure of the water decreases, and the water falls below the saturated vapor pressure (negative pressure region), so that cavitation occurs. Since the internal space of the enlarged diameter nozzle portion 17 has a divergent shape, an even stronger shearing force (force for tearing off gas) is generated in addition to the conventional jet shearing action. Further, when cavitation generated in the negative pressure region collapses in the positive pressure region (a region in which water pressure recovers to a positive pressure due to the stagnation flow on the wall surface side of the enlarged diameter nozzle portion 17), local impact pressure is applied and bubbles are generated. Will be further refined. in this way,
Cavitation is always present in the internal space of the enlarged diameter nozzle portion 17, and the generation and collapse of the cavitation are repeated, and a strong shearing force and an impact force work efficiently and locally. This makes the air finer, increases the surface area of the air in contact with the water, and allows a larger amount of air (oxygen) to be dissolved in the water.

As shown in FIGS. 2A and 2B, the collision plate 18 is inclined downward from the center in the radial direction.
Moreover, the periphery thereof is fixed to the nozzle body 11 by, for example, four support rods 21. This inclination makes it possible to effectively disperse the water mixed with the fine bubbles generated in the internal space of the enlarged diameter nozzle section 17 around the high-efficiency gas dissolving apparatus 10, and the fine bubbles ejected obliquely downward in the annular shape. Mixed water increases the oxygen concentration in the bottom soil. The support rod 2
The number of 1 may be any number as long as the collision plate 18 can be stably attached to the nozzle body 11. This support rod 21
By fixing the large-diameter nozzle portion 17 to the impingement plate 18, the nozzle body 11 and the impingement plate 18 can be moved in accordance with the flow rate of the high-pressure water introduced into the inlet 12 and the scale of the high-efficiency gas dissolving device 10. Can be adjusted, so that an optimum state in which water containing fine bubbles can be diffused around the high-efficiency gas dissolution apparatus 10 can be created under each condition. At this time, the mounting method of the support rod 21 may be any as long as it can be mounted and fixed.
8a can be provided and attached with bolts or screws, or can be bonded by welding or the like. Furthermore, since the collision plate 18 can change the radius of the collision plate 18 in accordance with the scale of the high-efficiency gas dissolving device 10, the water containing the fine bubbles is mixed around the high-efficiency gas dissolving device 10 under each condition. It is possible to create an optimal state in which can be dissipated.

In the present embodiment, the water is supplied to the nozzle body 11 by the hose 19a. However, any material capable of withstanding the water speed of 20 to 50 m / sec may be used. It may be a hose or a tube made of stainless steel. Reference numeral 20 denotes a nipple that is attached so that the supplied water does not leak when the hose 19 is connected to the nozzle body 11, and another sealing member that can prevent water leakage may be used. In addition, the enlarged diameter nozzle section 1
7 has an opening angle in the range of 40 to 90 degrees, which means that if the opening angle is less than 40 degrees, the high-pressure water discharged from the water discharge port 13 of the nozzle main body 11 has a large diameter nozzle 17.
This is because the remarkable velocity distribution disappears between the central part where the flow velocity is the fastest and the wall part where the flow velocity is the slowest, and the shear force of the fluid does not remarkably occur, so that air bubbles cannot be miniaturized. . On the other hand, when the opening angle exceeds 90 degrees, water is entrained from the periphery of the high-efficiency gas dissolving apparatus 10 into the inside of the enlarged nozzle 17, and the central part and the wall in the enlarged nozzle 17 are formed. This is because no good shearing force can be generated between the two, and cavitation cannot be miniaturized. From the above, the enlarged diameter nozzle section 17
Is more preferably 50 to 70 degrees, more preferably 6 to 70 degrees.
It is good to be 0 degrees.

The enlarged front end of the enlarged diameter nozzle portion 17 is smoothly rounded by setting its radius of curvature to 10 to 50 mm. Thereby, fine air bubbles existing in the internal space of the enlarged diameter nozzle 17 can be uniformly and smoothly diffused around the high-efficiency gas dissolving device 10 along the enlarged diameter nozzle 17. In addition, the diameter-increased front side of the diameter-increasing nozzle portion may be rounded. Further, the diameter-enlarged tip side of the diameter-enlargement nozzle portion may have an angular shape.

In the high-efficiency gas dissolving apparatus, the discharge direction of the high-pressure water is at the bottom of the water, but it can be in any direction. The material of the high-efficiency gas dissolving device may be any material that does not rust in water and a material that can withstand high-pressure water, such as a metal such as stainless steel or a plastic. Good. In the present embodiment, an example in which air is dissolved in water has been described as an example of a gas. However, the present invention is applicable to any gas such as air containing oxygen, ozone, or the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using a high-efficiency gas dissolving apparatus 10 according to an embodiment of the present invention, 35.8 L / min.
As a result of introducing high-pressure water at a water pressure of 2 kg / cm ² and dissolving the air, the bubble diameter of the micronized air is from 0.01 to
0.1 mm, power of pump 19 (power consumption)
Is 0.4 kW, which is smaller than the conventional 11 kW, and the oxygen dissolution efficiency (the ratio of the dissolved oxygen amount to the supplied oxygen amount, which is an index for increasing the oxygen amount in water) is 40%.
That was all.

Next, the characteristics, power consumption, and oxygen dissolution efficiency of an existing oxygen supply device will be described below as comparative examples. In the air diffusion tube method, when high-pressure air passes through a porous material charged in water, the air is miniaturized. The bubble diameter is 5m
m or more and the residence time in water is short, so the oxygen supply effect is low. The power consumption of this oxygen supply device is 11k
W, oxygen dissolving efficiency is 4.8%. The jet water jet method jets a water jet underwater with air from a nozzle,
In the method of supplying oxygen, in the conventional nozzle shape and the free space jet method, since large bubbles are generated together with the fine bubbles, the fine bubbles are induced to rapidly rise in the large bubbles, and the residence time of the bubbles is short. The power consumption of this oxygen supply device is 11 kW, and the oxygen dissolution efficiency is 0.8%. Although the water wheel system is the most popular product in the aquaculture industry due to its low price, the effect is only to create a water flow and the oxygen concentration is increased only near the water surface. The power consumption of this oxygen supply device is 0.
75 kW, oxygen dissolution efficiency is 0.5%.

[0016]

The high-efficiency gas dissolving apparatus according to any one of claims 1 to 5, wherein the base side is integrally connected to the water guide portion, the diameter increases toward the front side, and the high-pressure water flow discharged from the discharge port is positive. Since the cavitation has a diameter-enhancing nozzle portion, cavitation can always be maintained in the internal space of the diameter-enhancing nozzle portion, and generation and collapse of bubbles can be repeated. As a result, the shear force of the fluid and the local impact pressure generated when the cavitation is broken are applied, and the bubbles can be made finer, so that the ratio of the amount of gas dissolved to the amount of gas supplied to the water can be increased, and aquaculture can be achieved. It is promising as a device for improving breeding efficiency in a small space, such as a pond or aquaculture ponds such as shrimp or eel, and the effect is enormous. It uses less power and is energy saving compared to conventional products. Also, the nozzle body,
A collision member that is disposed with a gap further on the front side of the nozzle body and that disperses water mixed with fine bubbles discharged from the enlarged diameter nozzle portion to the surroundings, so that fine gas bubbles are reduced. Efficient gas can be uniformly dispersed around the gas dissolving device.

In particular, in the high-efficiency gas dissolving apparatus according to the second aspect, the diameter-enlargement nozzle portion has a truncated cone shape, and its divergence angle is set in a range of 40 to 90 degrees, so that the cavitation is increased in diameter. Because it can be always standing inside the enlarged diameter nozzle part without going out of the internal space of the nozzle part, the local impact pressure generated when cavitation is broken is applied to other bubbles, making the bubbles finer The ratio of the amount of gas dissolved to the amount of gas supplied to water can be increased. 4. The high-efficiency gas dissolving apparatus according to claim 3, wherein the collision member is inclined downward in the radial direction from the center, and the periphery is fixed to the nozzle body by a plurality of support rods. Fine gas bubbles existing in the internal space can be uniformly diffused around the high-efficiency gas dissolving device without mechanical stirring. In addition, since the collision member is fixed around the nozzle body by a plurality of support rods, the distance between the nozzle body and the collision member depends on the flow rate of the high-pressure water introduced into the injection port and the scale of the high-efficiency gas dissolving device. It can be adjusted, and under each condition, it is possible to create an optimum state in which water containing fine bubbles can be diffused around the high-efficiency gas dissolving device.

In the high-efficiency gas dissolving apparatus according to the fourth aspect, the enlarged front end of the nozzle portion is smoothly rounded. Thereby, the fine gas bubbles existing in the internal space of the enlarged diameter nozzle can be smoothly diffused to the periphery of the high-efficiency gas dissolving device along the wall of the enlarged diameter nozzle. In the high-efficiency gas dissolving apparatus according to the fifth aspect, the water guide section is provided with a throttle on the downstream side, and the throttle section is provided with a gas inlet. Thereby, the velocity distribution at the central portion and the wall surface side of the high-pressure water passing through the narrowing portion can be made uniform, so that high-pressure water having a uniform flow velocity can be produced. Further, since the gas inlet is provided in the restricting portion, high-pressure water mixed with a large amount of gas can be discharged. This makes it possible to increase the efficiency of dissolving the gas in water.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a high-efficiency gas dissolving apparatus according to one embodiment of the present invention.

FIGS. 2A and 2B are a front view and a side sectional view, respectively, of a collision plate of the high-efficiency gas dissolving apparatus.

FIGS. 3A and 3B are an explanatory diagram of the operation of the high-efficiency gas dissolving apparatus and a configuration diagram of the high-efficiency gas dissolving apparatus, respectively.

[Explanation of symbols]

10: high-efficiency gas dissolving device, 11: nozzle body, 12:
Water inlet, 13: water outlet, 14: water inlet, 15: gas inlet, 16: gas pipe, 17: expanded nozzle, 18: collision plate, 18a: hole, 19: pump, 19a: hose, 2
0: Nipple, 21: Support rod, 22: Expressed part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Taguchi 2-10 Kamiyamacho, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka F-term (reference) 4F033 QA10 QB02Y QB03X QB12Y QB15X QC05 QC07 QD04 QD07 QD11 QD16 QE09 QF23 QJ03 QJ12

Claims (5)

[Claims] A water pipe for discharging high-pressure water introduced from a water inlet from a water discharge port, a gas pipe provided with a gas inlet in the water pipe, and mixing gas into the high-pressure water by an ejector action; The base is integrally connected to the part,
A nozzle body having a diameter-enlarged nozzle portion that expands in diameter toward the front side and positively generates cavitation by the high-pressure water flow discharged from the discharge port, and is disposed with a gap further on the front side of the nozzle body. A high-efficiency gas dissolving apparatus, comprising: a collision member for dispersing water containing fine bubbles discharged from the enlarged diameter nozzle portion to the surroundings. 2. The high-efficiency gas dissolving apparatus according to claim 1, wherein said enlarged-diameter nozzle portion has a truncated cone shape and an opening angle in a range of 40 to 90 degrees. 3. The high-efficiency gas dissolving apparatus according to claim 1, wherein the collision member is inclined downward in a radial direction from a center, and a periphery of the collision member is attached to the nozzle body by a plurality of support rods. A high-efficiency gas dissolving apparatus characterized by being fixed. 4. The high-efficiency gas dissolving apparatus according to claim 1, wherein an enlarged front end of said enlarged-diameter nozzle portion is smoothly rounded. Gas melting equipment. 5. The high-efficiency gas dissolving apparatus according to claim 1, wherein the water guide is provided with a throttle on the downstream side, and the gas inlet is provided on the throttle. A high-efficiency gas dissolving apparatus.