JP5413726B2 - Gas-liquid mixing device - Google Patents

Description

  The present invention relates to a technique for mixing gas into a liquid, and more particularly to a gas-liquid mixing apparatus for mixing a gas such as air in the form of ultrafine bubbles in a liquid such as water or oil. Is.

  As an apparatus for mixing a gas into a liquid and obtaining a gas-liquid mixed liquid, apparatuses described below are known.

  The technique described in Patent Document 1 relates to a gas dissolver provided in an ultrafine bubble generator, and includes a cylindrical main body composed of an upstream screw part and a downstream cutter part. A static mixer is disclosed. The screw portion of the stationary mixer is constituted by a main body, a partition bar, and a spiral blade, and the cutter portion is constituted by a main body and a plurality of protrusions protruding from the inner peripheral surface of the main body. The gas-liquid two-phase fluid that has flowed in from the connecting pipe is subjected to a turning force and a strong twist at the screw part to be in a swivel state. Gas dissolution is promoted.

JP 2006-159187 A

  As disclosed in Patent Document 1, in a gas dissolver, a gas-liquid two-phase fluid in which a rotational force and a strong twist are imparted to a projection provided on an inner peripheral surface of a cylindrical member is brought into contact. For example, a screw part and a large number of protrusions are provided inside the cylindrical member so as to promote dissolution, and the production cost is high. It has not been identified.

  The present invention has been made in view of such points, and an object of the present invention is to provide a gas-liquid mixing device for mixing a gas such as air in the form of ultrafine bubbles in a liquid such as water or oil. In addition to simplifying the structure, the present invention provides a technology capable of mixing ultrafine bubbles into a wide variety of liquids and fluids that can be mixed.

  The gas-liquid mixing device of the present invention is a device that generates a bubble-containing liquid in which ultrafine bubbles are abundantly mixed with a relatively short diameter device. This is an example and is not particularly limited.

FIG. 1 is a schematic cross-sectional view illustrating the configuration of the present invention. An inlet 1 into which a fluid such as water or oil (hereinafter generally referred to as “liquid”) flows into at least one end of a columnar liquid passage 7. And a liquid passage pipe 12 through which a liquid is fed is fitted into the inlet 1.
The other end of the liquid flow 7 is formed with an outlet 2 from which the bubble-containing liquid mixed with ultrafine bubbles is discharged, and the outlet 2 is fitted with an outlet pipe 13.

  On the outer peripheral surface of the liquid flow 7, several concave flow channels 3 through which the liquid flows are formed in a spiral shape, and the entire convex portion of the flow channel 3 forms a gas permeable film (hereinafter referred to as “craze” in a resin film). 6) (referred to as "craze film").

  The liquid flow path 4 is a through hole provided in the liquid flow 7 in order to guide the liquid from the inlet 1 to one end (starting point) of the flow path 3, and the liquid flow path 5 is the other end ( In order to guide the bubble-containing liquid in which ultrafine bubbles are mixed into the outlet 2 from the end point), it is a through hole provided in the liquid flow 7.

  The casing 10 is a cylindrical outer structure that is open at both ends. The casing 10 constitutes a vent 8 on the outer peripheral surface, and stores the liquid 7 in the inner periphery so that the entire convex portion of the flow path 3 is covered. An intermediate space 9 for storing pressurized gas is formed between the outer peripheral surface of the craze film to be closely coated and the inner periphery of the casing 10.

  In the present invention, one of the reasons why the flow path is formed in a spiral shape is to secure a large area through which the liquid passes and to increase a region where ultrafine bubbles are taken into the liquid.

  According to the second aspect of the present invention, the spiral flow path 3 is formed in a narrow space with respect to the flow rate at the inlet 1 to restrict the liquid inflow region, so that the liquid that has flowed in from the inlet 1 flows. The flow velocity at the time of passing through the passage 3 is increased. In the initial stage of the bubble generation process in which the gas under pressure passes through the craze film 6 and forms in the liquid, the bubbles growing on the gas permeable surface are The gas-liquid mixing apparatus is characterized in that it is sheared by a liquid flow having an increased flow velocity and mixed into the liquid in the form of ultrafine bubbles.

  The invention according to claim 3 controls the flow rate of the liquid using a flow rate adjusting valve (not shown) and also controls the degree of pressurization of the gas that passes through the craze film 6 using a regulator (not shown). Thus, the gas-liquid mixing apparatus is characterized in that the mixing condition of bubbles suitable for the characteristics of the liquid is set.

  As an example, when the liquid is heavy oil and the gas to be mixed is a gas such as air, the heavy oil is a fluid having a higher viscosity than water, but the flow rate is adjusted by the flow control valve and the pressure feeding is controlled. The desired ultrafine bubble-containing liquid is purified by setting the degree of pressurization of the gas that permeates the crazing film 6 with a regulator to be appropriately higher than the feeding pressure.

  The invention according to claim 4 has a function in which the gas permeable film that allows gas under pressure to permeate into the liquid can limit the amount of gas permeation under conditions that allow the gas under pressure to permeate into the liquid. The gas-liquid mixing device according to claim 1, wherein the gas-liquid mixing device is composed of a pressurized gas-permeable membrane having fine pores, and the gas-permeable film is applied with fine communication holes. Gas permeable porous membranes such as a porous film having PTFE and PTFE.

  The present invention is a gas-liquid mixing device that makes it easy to mix ultrafine bubbles into various liquids without using a large-scale device, and by mixing air to oils such as heavy oil. Combustion efficiency is improved and mixed water is not only widely used for water purification, washing water, drinking water, etc., but also activates microorganisms in waste liquid treatment such as sewage and drainage. Therefore, it becomes a necessary device.

It is a schematic block diagram of the gas-liquid mixing apparatus of this invention. It is a schematic explanatory drawing of the liquid flow 7 which concerns on this invention. It is a perspective view which shows another form of the liquid passage main body which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

[Configuration of gas-liquid mixing device]
In the gas-liquid mixing apparatus of the present invention, as shown in the schematic configuration diagram of FIG. 1, an inflow port 1 into which liquid flows at least at one end of a columnar liquid flow 7 is formed. In addition, a liquid pipe 12 that guides a liquid whose pressure state is controlled and controlled through a flow rate adjusting valve to the gas-liquid mixing device 13 is fitted. The other end of the liquid flow 7 is formed with an outlet 2 for discharging the liquid containing the ultrafine bubbles purified when the liquid passes through the flow path 3, and the outlet 2 is fitted with the outlet pipe 13. Has been. In the drawing, the liquid discharge pipe 13 is expressed as a cylindrical pipe having the same diameter, but the liquid discharge pipe 13 may be a nozzle having a narrowed tip diameter.

  On the outer peripheral surface of the liquid passage 7, a concave flow channel 3 through which the liquid flows is formed in a spiral shape by a partition wall 14 constituting the flow channel 3, and the entire convex portion of the flow channel 3 is formed by a craze film 6. Adhesion coating.

  The liquid flow path 4 is a through hole provided in the liquid flow path 7 for guiding the liquid from the inlet 1 to one end (starting point) of several flow paths 3 formed on the outer peripheral surface of the liquid flow 7. The liquid flow path 5 is a through hole provided in the liquid flow path 7 for guiding the bubble-containing liquid in which fine bubbles are mixed into the outflow port 2 from the other end (end point) of the flow path 3.

  The casing 10 is a cylindrical outer structure in which both ends are open, and the degree of pressurization of the gas that permeates the craze film 6 is controlled in the vent hole 8 formed on the outer peripheral surface using a regulator. A vent tube 11 for guiding the gas is fitted. The inner periphery of the casing 10 is pressurized between the outer peripheral surface of the craze film 6 that contains the liquid 7 in the inner periphery and covers the entire convex portion of the flow path 3 and the inner periphery of the casing 10. The structure is such that an intermediate space 9 for containing gas is formed.

[Generation of ultrafine bubbles]
The pressurized gas accommodated in the intermediate space 9 passes through the craze film 6 that is tightly coated on the entire surface of the concave flow channel 3 formed on the outer peripheral surface of the liquid flow 7 and flows in the flow channel 3. It is produced in the normal state of ultrafine bubbles. The permeation of the pressurized gas through the craze film 6 forces the pressurized gas to penetrate through the fine voids (fine communication holes) constituting the craze, while the permeating gas passes through the voids (fine In this way, ultra fine bubbles are generated in the liquid.

[Pressurized fine bubbles]
The fact that the pressurized fine bubbles are easily fused into the liquid is expressed by the following equation.
w = k P
In this equation, w is the mass of the gas dissolved in the liquid, P is the pressure of the gas, and k is a proportionality constant.
From this, it can be seen that the mass of the dissolved gas is directly proportional to the pressure of the gas.
That is, when a gas is dissolved in a liquid, the more the gas that is in contact with the liquid is, the more gas is dissolved in the liquid.

  The gas-liquid mixing apparatus of the present invention is an apparatus that easily generates ultrafine bubbles of about 200 nm to 5 μm in water when the liquid is water and the gas is air. Even if the bubbles are visible, they have low buoyancy and drift in the water. On the other hand, ultrafine bubbles that are not visible are dissolved or mixed in the water and stay in the water. Liquid mixture water can be purified.

[Craze film]
The crazing film used in the present invention is a film in which gas permeability is expressed by performing a crazing treatment on a resin film. The craze is basically the same as that disclosed in Japanese Patent No. 315658, and generally has a width of 0.5 to 100 μm, preferably 1 to approximately parallel to the direction of molecular orientation of the resin film. 50 μm. The ratio of the number of crazes penetrating in the thickness direction of the film is 10% or more, preferably 20% or more, particularly preferably 40% or more, and penetrating with respect to the number of all crazes. When the ratio is less than the above range, it is difficult to obtain sufficient air permeability.
The craze mentioned here includes a surface craze appearing on the surface of the resin film and an internal craze generated inside, and refers to a region having a fine cracked pattern.

In FIG. 1, the nonwoven fabric 15 disposed on the outer peripheral surface of the craze film 6 is made of a material having air permeability and shapeability. If it is a material which has air permeability and shapeability, it is not specified as a nonwoven fabric.
The filamentary wire 16 is also a film protective material, and is wound around the peripheral surface of the nonwoven fabric 15 at an arbitrary interval for the purpose of preventing film peeling on the peripheral surface of the liquid flow 7. A fishing line is a suitable material because it is excellent in water resistance, oil resistance, and the like as a material of the filamentous wire.

  As shown in FIG. 1, packing 17, O-ring 18, and the like are employed at both ends of the middle space 9 to prevent gas leakage and liquid leakage. There is no specific method and structure for preventing gas leakage and leakage.

DESCRIPTION OF SYMBOLS 1 Inflow port 2 Outflow port 3 Flow path 4 Flow path 5 Flow path 6 Gas permeable film (craze film) formed by producing craze on resin film
DESCRIPTION OF SYMBOLS 7 Liquid flow 8 Ventilation hole 9 Middle space 10 Casing 12 Liquid flow pipe 13 Gas-liquid mixing apparatus 14 Partition 15 Nonwoven fabric 16 Filamentary wire 17 Packing

Claims (4)

  An inlet 1 through which liquid flows in one end, an outlet 2 through which liquid flows out to the other end, a flow path 3 through which liquid flows on the outer peripheral surface, and a liquid flow path 4 that guides the liquid from the inlet 1 to one end of the flow path 3 And a flow passage 5 for guiding the liquid from the other end of the flow path 3 to the outlet 2 is formed, and the entire surface of the flow path 3 is covered with a gas permeable film 6 formed by forming a craze on the resin film. A cylindrical liquid passage 7, a vent 8 on the peripheral surface of the cylindrical body open at both ends, and gas permeation formed by generating crazes on the resin film entirely on the inner periphery of the cylindrical body A liquid passage 7 that is covered with the conductive film 6 is stored, and an intermediate space 9 that stores the pressurized gas is formed between the outer peripheral surface of the liquid flow 7 and the inner periphery of the cylindrical body. The gas-liquid mixing device is characterized in that the flow path 3 is formed in a spiral shape.   By limiting the flow rate at the inflow port 1 by forming a spiral flow path 3 in a narrow space, when the liquid flowing in from the inflow path 1 passes through the flow path 3, the flow velocity is increased. In the initial stage of the bubble generation process that permeates the gas permeable film 6 formed by forming a craze in the resin film and forms in the liquid, the bubbles that grow on the gas permeable surface are sheared by the liquid flow with the increased flow velocity. The gas-liquid mixing device according to claim 1, wherein the generated bubbles are mixed in the liquid in the form of ultrafine bubbles.   The flow rate of the liquid at the inlet 1 is controlled by the flow rate adjusting valve to control the flow velocity in the spiral flow path 3 formed in a narrow space, and the craze is generated in the resin film by the regulator. The gas-liquid mixing device according to claim 1, wherein the mixing condition of bubbles suitable for the characteristics of the liquid is set by controlling the degree of pressurization of the gas that permeates the gas permeable film 6. The gas permeable film which permeate | transmits the gas of a pressurization state in a liquid is comprised by the pressurization permeable film | membrane which has a fine pore with the function which can restrict | limit the permeation | transmission amount of gas. Gas-liquid mixing device.

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