JP2010000490A - Method and device for treating liquid material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for treating a liquid material so as to effectively perform minute grinding, stable emulsification, homogenization and sterilization of the liquid material with a constitution as simple as possible. <P>SOLUTION: By noticing that high-pressure gas is used in either ejection type ultrasonic oscillation method or ejector method, a number of high-pressure gas injection ports and resonance cavities are allowed to radially confront each other in an annular chamber so as to generate ultra sonic waves, the annular chamber is communicated with a Laval nozzle of an ejector via a shrinkage conical ring so as to apply highly-densified ultrasonic waves to a mixing nozzle part of the ejector and, thereby, both effects of the ultrasonic waves and the ejector are exerted to the liquid material simultaneously and synergetically. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for treating a liquid substance for the purpose of atomization, stable emulsion formation, homogenization, sterilization, etc. of the liquid substance in various processes such as production of oil-water emulsions, processing of beverages and pharmaceuticals / cosmetics, and wastewater treatment. And apparatus.

  In recent years, the excellent combustion performance of oil-water emulsions has attracted attention. In order to maintain a stable emulsion for a long time, in addition to the addition of a surfactant and a stirring operation, a low frequency of about 20 kHz is used for the purpose of utilizing a strong ultrasonic dispersion action. The region is irradiated with ultrasonic waves (see, for example, Patent Document 1). In addition, in the pretreatment of organic wastewater for methanation, ultrasonic waves in a low frequency region are used in many fields in the treatment of liquid substances, such as utilizing the crushing action of ultrasonic waves for the purpose of solubilizing sludge particles.

  As the ultrasonic oscillation method, there is a fusible type known as the Hartmann method in addition to the piezoelectric type and the magnetostrictive type (for example, see Non-Patent Documents 1 and 2). This method oscillates by jetting a high-speed air current into the resonance cavity. When the cavity diameter is d, the depth is L, and the sound velocity of the medium is V, the frequency is approximately N≈V / 4 (L + 0.3d). It is based on the phenomenon that sound waves are oscillated, and its structure is simple and easy to handle. However, in order to obtain ultrasonic waves, it is necessary to reduce L and d, and it is used for ultrasonic generation in a small and low frequency region. .

  On the other hand, there is a method using a supersonic shock wave generated by a known water vapor ejector for the purpose of emulsifying, homogenizing and sterilizing a liquid substance (see, for example, Patent Document 2). This method has a relatively simple structure and is easy to operate. However, since the mechanical efficiency is low, design consideration is required to reduce the drive energy (water vapor consumption) as much as possible. (For example, Non-Patent Document 3)

JP 2006-28215 A JP-A-4-256428 and JP-A-7-506527 Published by Nikkan Kogyo Shimbun, Yasuo Iida, “Sono Process Story”, etc. Kobayashi Riken News No. 33.2 and no. 34.2 Published by Maruzen Co., Ltd., Chemical Engineering Handbook "Steam Ejector", etc.

  In view of the above background, the present invention aims at atomization, stable emulsion formation, homogenization, sterilization, etc. of a liquid substance, has an as simple structure as possible, has a low driving energy such as an amount of water vapor, and is an effective treatment. The creation of methods and devices is an issue.

  In order to solve the above-described problems, the present invention focuses on the fact that both the above-described fumarating ultrasonic oscillation method and ejector method use the same high-pressure gas (water vapor) as a driving source. Thus, the performance is improved by the simultaneous synergistic effect of the ultrasonic wave and the ejector, and energy saving is also achieved by using a high-pressure gas in both.

  That is, the invention according to claim 1 introduces an ultrasonic wave generated by injecting a high-pressure gas such as compressed air or water vapor into the resonance cavity into a drive nozzle of an ejector that is driven by the high-pressure gas. A method for treating a liquid substance, wherein the effects of both ultrasonic waves and ejectors are caused to act simultaneously and synergistically.

  The invention described in claim 2 is a method for treating a liquid substance according to the method described in claim 1, wherein the high-pressure gas is superheated steam.

  Further, the invention according to claim 3 oscillates ultrasonic waves by causing a large number of high-pressure gas injection ports and resonance cavities to confront each other radially in an annular chamber having a reflecting mirror at one end, and the other end of the annular chamber. By connecting an ejector to a contraction / expansion nozzle (Laval nozzle) through a contraction conical ring, a liquid substance is sucked and mixed, and both the effects of ultrasound and ejector are made to act simultaneously and synergistically on the liquid substance. This is a liquid material processing apparatus.

  According to the invention described in claim 1, since the same high-pressure gas can be commonly used for ultrasonic oscillation and ejector drive, the effects of the ultrasonic wave and the ejector can be exerted simultaneously and synergistically with a small amount of high-pressure gas used. It has the effect of effectively performing atomization, stable emulsion formation, homogenization, and sterilization of substances.

  According to the second aspect of the present invention, by using the superheated steam as the water vapor ejected by ultrasonic oscillation, the water vapor is prevented from condensing due to a decrease in the temperature of the fumarole and there is no possibility of hindering the ejector action at the subsequent stage.

  According to the third aspect of the present invention, not only the ultrasonic oscillator and the ejector are integrated to form a compact configuration, but also the same high-pressure gas can be commonly used for driving both as described above. There is an effect that it is possible to construct a device that simultaneously and synergistically exhibits the effects of ultrasonic waves and ejectors with a small amount of high-pressure gas used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a detailed view of a portion A in FIG. 1, and FIG. 3 is a cross-sectional view of PP in FIG.

  In the figure, a high-pressure gas 1 such as compressed air or water vapor is supplied to a cylindrical high-pressure gas chamber 3 from a high-pressure gas inlet 2, and an inner nozzle 4 having a high-pressure gas chamber 3 is provided with an injection nozzle 6 having an injection hole 5. A large number (eight in the illustrated example) are fixed in a radial manner, and a resonator 9 having a resonance cavity 8 is fixed to the outer cylinder 7 fitted to the inner cylinder 4 so as to face the same center line as that of the air holes 5. A reflecting mirror 11 is provided at one end of an annular chamber 10 constituted by the outer surface of the inner cylinder 4 and the inner surface of the outer cylinder 7, and the other end is connected to a contracting conical ring 12 and contracted at the end of the contracting conical ring 12. Construct an expansion nozzle (Laval nozzle) 13 In order to accurately reflect the oscillated ultrasonic wave, the reflecting mirror 11 may be constructed of a parabolic rotator whose focal point is a center point of about ½ of the distance X between the jet nozzle tip 6 ′ and the resonance cavity. A liquid chamber 15 communicating with the stock solution inlet 14 is provided at the outlet of the contraction / expansion nozzle 13, and a mixing nozzle 18 composed of a contraction tube 16 and a throat tube 17 is provided opposite to the outlet of the contraction / expansion nozzle 13. Further, by providing an enlarged nozzle 19 and a treatment liquid outlet 20 in connection with this, an ejector as is well known can be constructed. In the figure, 21 indicates a stock solution and 22 indicates a processing solution.

  With the above configuration, the operation will be described below when steam is used as the high-pressure gas. The water vapor supplied to the high-pressure gas chamber 3 is jetted into the resonance cavity 8 from the nozzle hole 5, and when the diameter d of the resonance cavity 8 is 4 mm and the depth L is 4 mm, the sound velocity V in the water vapor is approximately 400 m / sec. The frequency N≈V / 4 (L + 0.3d) ≈20 kHz, and ultrasonic waves in a low frequency region suitable for liquid material processing are oscillated. The ultrasonic waves are concentrated from the annular chamber 10 via the contraction conical ring 12 and become high density, reach the contraction / expansion nozzle 13 and proceed with the water vapor flow.

  The vacuum action generated by the high-speed steam flow ejected from the contraction / expansion nozzle 13 sucks the stock solution 21 supplied from the stock solution inlet 14 to the liquid chamber 15 and mixes the gas and liquid. At the same time, a shock wave is generated by rapid condensation of water vapor. Then, powerful impact mixing is performed in the mixing nozzle 18 constituted by the contraction tube 16 and the throat tube 17, and thereafter the static pressure is recovered by the expansion nozzle 19 and discharged from the processing liquid outlet 20. In addition to the well-known water vapor ejector effect, in this method, the high-density ultrasonic waves gathered by the shrinking conical ring 12 reach the mixing nozzle 18 as described above, and the ultrasonic particle-breaking action and dispersion emulsifying action are strong. Therefore, more powerful atomization, stable emulsion formation, homogenization, sterilization, and the like are possible compared to conventional ejector processing.

  Of the above, the water vapor used may be saturated water vapor, but this may cause a part of the water vapor to condense due to a decrease in temperature when blown from the fumarole hole 5 and hinder the ejector action at the later stage. Superheated steam may be used to prevent this. In the above, the stock solution inlet 14 to the ejector is provided at one place, but it is of course possible to employ a system in which the stock solution is supplied from a plurality of places as shown in Patent Document 2 and the like.

  Sectional view of an embodiment of the present invention   Detailed view of part A in FIG.   PP sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High-pressure gas 2 High-pressure gas inlet 3 High-pressure gas chamber 4 Inner cylinder 5 Injecting hole 6 Injecting nozzle 6 'Injecting nozzle tip 7 Outer cylinder 8 Resonant cavity 9 Resonator 10 Annular chamber 11 Reflecting mirror 12 Contracting conical ring 13 Contracting / expanding nozzle (Laval nozzle)
14 Stock solution inlet 15 Liquid chamber 16 Contraction tube 17 Throat tube 18 Mixing nozzle 19 Expansion nozzle 20 Treatment solution outlet 21 Stock solution 22 Treatment solution

Claims (3)

  By introducing ultrasonic waves generated by injecting high-pressure gas such as compressed air or water vapor into the resonant cavity into the drive nozzle of the ejector that is driven by the high-pressure gas, both the effects of ultrasonic and ejector are simultaneously synergized with the liquid substance. A method for treating a liquid substance, characterized by acting on a liquid.   The method for treating a liquid substance according to claim 1, wherein the high-pressure gas is superheated steam.   A high-pressure gas injection port and a resonance cavity are radially opposed to each other in an annular chamber having a reflecting mirror at one end to oscillate ultrasonic waves, and the other end of the annular chamber is contracted and expanded via a contracting conical ring. Liquid material processing device characterized in that by constructing an ejector connected to a (Laval nozzle), the liquid material is sucked and mixed, and both the effects of ultrasound and ejector are simultaneously and synergistically acted on the liquid material. .

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