JP3077417U - Two-fluid mixing device - Google Patents

Abstract

(57) [Summary] (Modifications required) [Problem] Even if the pore diameter of ceramic is several microns or less, the gas pressure can be kept to several atmospheres or less, and a simple and inexpensive device for dissolving a large amount of gas in liquid can be realized. What you can do. A means for breaking a surface tension and causing bubbles to float in a liquid depends on the force of a vortex on the liquid side. That is,
The pressure Pa on the gas side is the static pressure (= total pressure-dynamic pressure) Ps on the liquid side.
If it is set higher than this, the bubbles coming out of the holes of the ceramic cylinder 11 will be convex toward the liquid side, but if the hole diameter is small, the bubbles will grow beyond the state where the surface tension of the liquid and the gas pressure are balanced. I can't stay. On the outside of the ceramic cylinder, the liquid flows in a narrow flow path at a high speed so as to exceed the critical Reynolds number, the flow of the liquid becomes turbulent, fine vortices break the surface tension of bubbles,
The gas was made into fine bubbles and was caught in the liquid so as to be continuously discharged.

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mixing a gas such as ozone or oxygen with a liquid such as water at a high concentration. It is used for disinfection and disinfection, breeding of tropical fish and cultured fish, and purification of rivers and lakes.

2. Description of the Related Art An ozone water production apparatus using a porous ceramic cylinder and an oxygen supply apparatus for water have been used for a long time and have been widely used. Each of these devices was limited to a device in which a gas such as ozone was fed into a ceramic cylinder at a high pressure, and sent out as a bubble from a hole in the ceramic to an external liquid such as water to be dissolved therein. It is well known that the smaller the bubble diameter, the easier the gas is to dissolve in the liquid. Efforts have been made to reduce the pore size of the ceramic in order to reduce the bubble diameter, resulting in improved performance. However, as is well known, there is a problem that the gas pressure for breaking the surface tension and causing bubbles to float in the liquid must be increased in inverse proportion to the square of the pore diameter when the pore diameter of the ceramic is reduced. there were. For example, taking the case of air and water as an example, if the pore size of the ceramic is 10 μm or less, the gas pressure requires several tens of atmospheres or more, which is impractical. For this reason, in practice, only ceramics having a pore diameter of several tens of microns or more are used, and there is an inconvenience that they are not sufficiently dissolved in liquid due to large bubbles. In addition, there is also a disadvantage that the bubbles are bonded to each other and grow into larger bubbles, which hinders dissolution in a liquid. In order to solve this inconvenience, techniques have been devised such as mechanical separation of large air bubbles with a rotary impeller or ultrasonic waves, but no satisfactory results have been obtained. Also, it has been pointed out that the apparatus is excessively large and expensive because the gas pressure has to be extremely high.

FIG. 3 shows an embodiment of the present invention. A gas supply device comprising an ozone producing device 13 and a pump 14 is connected to an end portion 17 of a ceramic cylinder 16 by a pipe 15 and supplies ozone having a concentration of 5 ppm into the cylinder 16 at a pressure of about 5 kg / cm 2. In a ceramic cylinder having an outer diameter of 8 mm, an infinite number of holes of about 1 micron are formed with a porosity of about 20%. Outside the ceramic cylinder 16, a metal cylinder 18 having an inner diameter of 10 mm is mounted concentrically with the cylinder 16. A liquid inlet 19 is provided at an end of the cylinder 18, and is connected to a liquid supply device including a water tank 20 and a pump 21 by a pipe. The opposite end of the cylinder 18 is opened as a discharge hole 22 for the gas-liquid mixture. The liquid supply device supplies about 20 liters of water per minute to the gap between the cylinder 16 and the cylinder 19 at a pressure of about 5 kg / cm 2. The average flow velocity of the water flowing through the gap 23 is about 12 m / sec, far exceeding the critical Reynolds number. The static pressure on the water side is about 2 kg / square cm, which is sufficiently lower than the pressure on the gas side. The gas-liquid mixture from the discharge hole X is discharged into a water tank 20 of about 50 liters and circulates. In this example, 50 liters of water became completely opaque after about 1 minute and the ozone concentration reached oversaturation. Even when the pump on the water side was stopped and only the pump on the gas side was operated, no bubbles were generated. FIG. 4 shows another embodiment. A pump 24 is connected to the end 27 of the ceramic cylinder 26 by a pipe 25 and supplies room air to the inside of the cylinder 26 at a pressure of about 5 kg / cm 2. In a ceramic cylinder having an outer diameter of 8 mm, an infinite number of holes 28 of about 1 micron are formed with a porosity of about 20%. Outside the ceramic cylinder 26, a metal cylinder 28 having an inner diameter of 10 mm is mounted concentrically with the cylinder 26. A liquid inlet 29 is provided at an end of the cylinder 28 and is connected to a water tap 30 by a pipe. The opposite end of the cylinder 28 is opened as a discharge hole 31 for the gas-liquid mixture. The water pressure was about 5 kg / cm 2 and the water flow was about 12 liters per minute. The flow velocity of the water flowing through the gap 32 is about 7 m / sec, which exceeds the critical Reynolds number. The gas-liquid mixture from the discharge hole 31 was discharged to an empty water tank 33. The discharged gas-liquid mixture was cloudy and the oxygen concentration had reached a level of supersaturation. FIG. 5 shows an embodiment for further enhancing the gas-liquid mixing ability, in which three sets of a ceramic cylinder and an outer cylinder are connected in parallel. FIG. 6 shows an embodiment for further strengthening the vortex of the liquid, in which fine spiral irregularities are formed on the inner surface of the outer cylinder.

[Effects of the Invention] The dilemma of the prior art in which the smaller the bubble diameter is, the easier the gas is to dissolve in the liquid but the gas pressure must be increased. However, even when the pore size of the ceramic was several microns or less, the gas pressure could be reduced by several orders of magnitude to several atmospheres or less. With this idea, it has become possible to easily and inexpensively realize a device that dramatically dissolves a large amount of gas into a liquid, such as a high-concentration ozone water production device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic structure of the present invention. 1 Micropore 6 Tube 2 Fluid A Inlet 7 Fluid A Supply Device 3 Ceramic Tube 8 Fluid B Supply Device 4 Fluid B Inlet 9 Fluid A 5 AB Mixed Fluid Outlet 10 Fluid B

FIG. 2 is a diagram showing a basic principle of the present invention. 11 Part of one side cross section of ceramic cylinder 12 Part of one side cross section of outer cylinder Pa Gas pressure Ps Static pressure of liquid

FIG. 3 is a diagram showing an embodiment of the present invention. 13 Ozone production apparatus 19 Water inlet 14 Pump 20 Water tank 15 Pipe 21 Water pump 16 Ceramic cylinder 22 Ozone water discharge hole 17 Ozone inlet 23 Clearance (water flow path) 18 Metal cylinder

FIG. 4 is a diagram showing another embodiment of the present invention. 24 air pump 29 water inlet 25 pipe 30 water supply 26 ceramic cylinder 31 discharge hole 27 air inlet 32 gap (flow path of water) 28 metal cylinder 33 water tank

FIG. 5 is a view showing another embodiment of the present invention. 34 ceramic cylinder 38 ceramic cylinder connecting pipe 35 outer cylinder 39 outer cylindrical connecting pipe 36 gas supply device 37 supply device

FIG. 6 is a view showing another embodiment of the present invention. 40 ceramic cylinder 41 outer cylinder with spiral projection

Claims (6)

[Claims for utility model registration] As shown in FIG. 1. A ceramic cylinder 3 having a plurality of fine holes 1 and a fluid A inlet 2. The ceramic cylinder 3 is disposed substantially concentrically outside the cylinder 3 and has a fluid B inlet 4 and an AB mixed fluid outlet 5. A fluid A supply device 7 connected to the fluid A inlet 2 by a pipe or the like, and a fluid B supply device 8 connected to the fluid B inlet 4 by a pipe or the like. A two-fluid mixing apparatus characterized in that the fluid B10 is adjusted to be higher than the static pressure of the fluid B10 flowing through the gap between the cylinder 3 and the cylinder 6, and the Reynolds number of the fluid B10 is equal to or greater than the critical Reynolds number. 2. The two-fluid mixing device according to claim 1, wherein the main component of the fluid A is ozone, oxygen, or air, and the main component of the fluid B is water. 3. The two-fluid mixing apparatus according to claim 1, wherein a plurality of cylinders 3 and 6 are connected in parallel. 4. The two-fluid mixing device according to claim 1, wherein fine irregularities such as spiral projections are provided on the inner surface of the cylinder. 5. The sectional shape of the cylinder 3 or 6 is any one of a circle, an ellipse, a square, and a star.
The two-fluid mixing device according to claim 1. 6. The two-fluid mixing device according to claim 1, wherein the fluid A is water and the fluid B is petroleum.