JP2013034958A - Nanobubble producing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nanobubble producing apparatus capable of easily producing nanobubbles without using a large-scale apparatus.SOLUTION: The nanobubble producing apparatus includes: a microbubble producing section 1 that includes piping 100 for liquid to flow through, a branch pipe 103 diverging a part of liquid at a branch part 104 upstream in the piping 100 and returning the part of the liquid again at a confluence part 105 downstream in the piping 100, and a gas-liquid mixing part provided at an intermediate part of the branch pipe 103 to mix gas with the part of the liquid, and produces microbubbles in a range of 4-100 μm in the liquid; and a nanobubble producing section 2 that includes a nanobubble producing part body 200 connected to the downstream end side of the piping 100, perforated plates provided in the body 200, and collision plates provided downstream of the perforated plates, in proximity to the perforated plates, and produces nanobubbles in a range of 100 nm or less in the liquid. A distance from the confluence part 105 to the perforated plates is in a range of 5D-6D based on the inner diameter D of the piping 100.

Description

  The present invention relates to a nanobubble production apparatus, and more particularly to a nanobubble production apparatus that can easily produce nanobubbles without using a large-scale apparatus.

  Conventionally, in Patent Document 1, a liquid containing microbubbles is supplied to a storage tank, and ultrasonic vibration is applied to the liquid containing the supplied microbubbles by an ultrasonic vibration device, whereby microbubbles in the liquid are contained. A method for producing nanobubbles is disclosed in which a nanobubble is generated in a liquid. According to this method, the collapse of the microbubbles in the liquid can be promoted, and a large amount of nanovalves can be generated in the liquid in a short time.

  Patent Document 2 describes a method of manufacturing nanobubbles by applying a stimulus of shock waves accompanying underwater discharge to microbubbles contained in a liquid to rapidly reduce the microbubbles.

  Patent Document 3 discloses a nanobubble generator including a microbubble generator M and a nanobubble generator N. The microbubble generating means M is composed of a first liquid container, a heating means, and a rotating body with blades. The nanobubble generating means N includes at least one of a second liquid container connected to the microbubble generating means M by piping, a cooling means, a microwave generator, an ultrasonic generator, a bladed rotor, and a magnet. The bubble crushing means is provided.

JP 2006-289183 A JP 2005-245817 A JP 2007-136255 A

  However, in the above-described prior art, large-scale devices such as an ultrasonic vibration device, an apparatus for producing a shock wave accompanying underwater discharge, and an ultrasonic generator are required.

  Then, this invention is made | formed in view of the said subject, and makes it a subject to provide the nano bubble manufacturing apparatus which can manufacture a nano bubble simply, without using a large-scale apparatus.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A pipe through which the liquid flows, a branch pipe that branches a part of the liquid at a branch section on the upstream side of the pipe and returns again at a junction section on the downstream side of the pipe, and provided in the middle of the branch pipe A microbubble production unit that includes a gas-liquid mixing unit that mixes a gas with a part of the liquid, and generates microbubbles in the range of 4 to 100 μm in the liquid;
From the nanobubble production unit main body connected to the downstream end of the pipe, a plate with a hole provided in the main body, and a collision plate provided in the vicinity of the plate with the hole on the downstream side of the plate with the hole A nanobubble production apparatus comprising a nanobubble production unit that generates nanobubbles in a range of 100 nm or less in a liquid,
The distance L to the said junction part and the said board with a hole is the range of 5D-6D with respect to the internal diameter D of the said piping, The nano bubble manufacturing apparatus characterized by the above-mentioned.

(Claim 2)
The nanobubble manufacturing apparatus according to claim 1, wherein the plate with holes is a slit plate.

(Claim 3)
The nanobubble production apparatus according to claim 1 or 2, wherein the pressure in the pipe of the microbubble production unit is maintained in a range of 0.5 MPa to 1.0 MPa.

  ADVANTAGE OF THE INVENTION According to this invention, the nano bubble manufacturing apparatus which can manufacture a nano bubble simply can be provided, without using a large-scale apparatus.

Sectional drawing which shows an example of the nanobubble manufacturing apparatus which concerns on this invention Explanatory cross-sectional view showing an example of a nanobubble manufacturing unit (A) shows an example of the shape of the slit plate used in the nanobubble manufacturing section, and (B) is a cross-sectional view showing an example of a collision plate

  Embodiments according to the present invention will be described below.

  FIG. 1 is a cross-sectional view showing an example of a nanobubble production apparatus according to the present invention.

  In FIG. 1, 1 is a microbubble manufacturing part, and 2 is a nanobubble manufacturing part.

  The microbubble manufacturing unit 1 includes a pipe 100 through which liquid flows. The cross-sectional shape of the pipe 100 may be circular or rectangular.

  The pipe 100 can be provided with a booster pump 101 (BP: abbreviation of booster pump), but the pressure booster pump 101 need not be provided if pressure water can be supplied to the inlet 102 of the pipe. .

  The discharge pressure of the booster pump 101 is preferably a pressure capable of maintaining the pressure in the pipe 100 in the range of 0.5 MPa to 1.0 MPa, and more preferably a pressure capable of maintaining the pressure in the range of 0.6 MPa to 0.8 MPa. When the booster pump 101 is not provided, the pressure in the pipe 100 is preferably maintained in the range of 0.5 MPa to 1.0 MPa, and is preferably maintained in the range of 0.6 MPa to 0.8 MPa. Is more preferable.

  In the present invention, examples of the liquid include fresh water, seawater, acid, alkaline water, microorganism-containing water, digestive fluid (discharged from a methane fermentation tank, etc.) and the like.

  Reference numeral 103 denotes a branch pipe, which is configured to branch at the branch section 104 on the upstream side (left side in the drawing) of the pipe 100 and return again at the junction section 105 on the downstream side of the pipe 100. A part of the branched liquid flows in the branch pipe 103, and the gas is mixed in the gas-liquid mixing section 106 provided in the middle of the branch pipe 103.

  Although the gas-liquid mixing part 106 will not be specifically limited if it is a gas-liquid mixing apparatus which can mix gas with a liquid, For example, an ejector, a line mixer, etc. are mentioned.

  Reference numeral 107 denotes a gas supply source for supplying gas to the gas-liquid mixing unit 106. Reference numeral 108 denotes a gas-liquid mixing pump (EP: abbreviation of ejector pump) provided in the line of the branch pipe 103. The pressure of the gas-liquid mixing pump is determined in consideration of the pressure loss of the gas-liquid mixing unit 106, the supply pressure of the gas from the gas supply source, the fluid pressure in the pipe 100 at the confluence unit 105, and preferably 0. The range is from 3 to 1.0 MPa, and more preferably from 0.5 to 0.9 MPa.

  Examples of the gas supplied from the gas supply source 107 include ozone, oxygen, air, and carbon dioxide.

  Since the microbubble manufacturing unit 1 according to the present invention is configured as described above, the gas-liquid mixed solution generated in the branch pipe 103 is joined to the pipe 100 by the joining unit 105 and the fluid after the joining is obtained. Inside, microbubbles having a diameter of 4 to 100 μm are generated.

  As a factor which produces | generates a microbubble, the pressure in the piping 100 in the case of confluence | merging is maintained in the range of 0.5 MPa-1.0 MPa, and it is estimated presumably that it is a high pressure. Bubbles are mixed in the gas-liquid mixed solution generated in the branch pipe 103, and the bubble diameter is in the range of 4 to 1000 μm, but the pressure in the pipe 100 at the time of merging is 0.5 MPa to 1. It is estimated that microbubbles having a diameter of 4 to 100 μm are formed because the pressure is maintained in the range of 0.0 MPa and high pressure.

  The nanobubble manufacturing unit 2 is provided on the downstream end side of the pipe 100 constituting the microbubble manufacturing unit 1. Reference numeral 200 denotes a nanobubble manufacturing unit main body connected to the downstream end of the pipe 100. The shape of the nanobubble manufacturing unit main body 200 bulges toward the vicinity of the center in the liquid flow direction, as shown in the figure, and inclined surfaces are formed on both sides of the central bulging part 201. It is also a shape in which two conical funnels 202 and 203 are joined in the vicinity of the central bulging portion 201 with the tops facing in opposite directions.

  A connection pipe 204 is formed on the downstream side of the nanobubble manufacturing unit 2 as necessary. A nanobubble detection tube (not shown) can be attached to the connection pipe 204.

  A slit plate 205 is installed as an example of a plate with a hole inside the nanobubble manufacturing unit main body 200. The installation method is not particularly limited. As shown in FIG. 3A, the slit plate 205 is provided with a plurality of slits 205A in parallel. The number of slits is not particularly limited, but the slit width is preferably in the range of 100 to 1000 μm.

  206A, 206B, and 206C are collision plates that are provided in the vicinity of the slit plate 205 on the downstream side of the slit plate 205. As shown in FIG. 2, the collision plates 206A, 206B, and 206C are plate-like bodies that obstruct the liquid that passes through the slits of the slit plate 205 so that it cannot substantially pass through as it goes straight.

  In this embodiment, as shown in FIG. 3B, a three-divided plate-like body such as 206A, 206B, and 206C may be used, but it may be a single plate or two or more divided plate-like bodies.

  In the present invention, the distance L between the joining portion 105 and the slit plate 205 is in the range of 5D to 6D with respect to the pipe inner diameter D. Here, the merging portion 105 that defines the distance L means a portion closer to the slit plate side at the connecting portion of the pipe 100 and the branch pipe 103, and the slit plate 205 means a surface located on the upstream side of the slit plate. For example, when the inner diameter of the pipe 100 is 100 mm, the distance L between the joining portion 105 and the slit plate 205 is in the range of 500 to 600 mm.

  The present inventor combined with the action of the slit plate 205 and the collision plates 206A, 206B, and 206C because the distance L between the joining portion 105 and the slit plate 205 is in the range of 5D to 6D with respect to the pipe inner diameter D. It has been found that nanobubbles in the range of 100 nm or less can be generated in the liquid.

  In the present invention, the nanobubble detection method can be measured by a dynamic light scattering photometer, or can be measured by electron spin resonance (ESR).

  In the above embodiment, the case where the slit plate is used as the holed plate has been described. However, a punching plate may be used instead of the slit plate. The diameter of the punching hole is preferably a hole diameter capable of maintaining the pressure in the pipe 100 in the range of 0.5 Mpa to 1.0 Mpa, and more preferably a hole diameter capable of maintaining the pressure in the range of 0.6 Mpa to 0.8 Mpa.

  Nanobubbles obtained by the nanobubble production apparatus of the present invention can be used for spraying leaves on plants, purifying bath water, and the like. Moreover, when membrane-treating seawater, nanobubbles fulfill the function of reducing the viscosity of water. For example, when passing seawater through a membrane, the viscosity of seawater increases in winter and the amount of filtration decreases. If the seawater viscosity is reduced by nanobubbles, the membrane treatment can be continued even in winter. Microbubbles also have a lower viscosity, but nanobubbles have the effect of lowering.

DESCRIPTION OF SYMBOLS 1: Microbubble manufacturing part 100: Piping 101: Booster pump 102: Piping inlet 103: Branch pipe 104: Branching part 105: Merging part 106: Gas-liquid mixing apparatus 107: Gas supply source 108: Gas-liquid mixing pump 2: Nano bubble Manufacturing part 200: Nano bubble manufacturing part main body 201: Swelling part 202, 203: Conical funnel 205: Slit plate 206A, 206B, 206C: Collision plate

Claims (3)

A pipe through which the liquid flows, a branch pipe that branches a part of the liquid at a branch section on the upstream side of the pipe and returns again at a junction section on the downstream side of the pipe, and provided in the middle of the branch pipe A microbubble production unit that includes a gas-liquid mixing unit that mixes a gas with a part of the liquid, and generates microbubbles in the range of 4 to 100 μm in the liquid;
A nanobubble production unit main body connected to the downstream end side of the pipe, a plate with a hole provided in the main body, and a collision plate provided in the vicinity of the plate with a hole on the downstream side of the plate with the hole; A nanobubble production apparatus comprising a nanobubble production unit that generates nanobubbles in a range of 100 nm or less in a liquid,
The distance L to the said junction part and the said board with a hole is the range of 5D-6D with respect to the internal diameter D of the said piping, The nano bubble manufacturing apparatus characterized by the above-mentioned.   The nanobubble manufacturing apparatus according to claim 1, wherein the plate with holes is a slit plate. The nanobubble production apparatus according to claim 1 or 2, wherein the pressure in the pipe of the microbubble production unit is maintained in a range of 0.5 MPa to 1.0 MPa.

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