JP5346170B2 - Ozone generator and electrode unit setting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ozone generating device and a method for setting an electrode unit of the device for accurately determining the conditions to obtain the most uniform discharge gap in a discharge space in combination of cylindrical electrodes to be used and for obtaining a means of further efficiently generating an ozonated gas. <P>SOLUTION: The ozone generating device 100 has an electrode unit including coaxial cylindrical metal electrodes 1, 2 disposed opposing to each other, with the surface of at least one electrode 1 being covered with a dielectric layer 3, in which a discharge gap 12 is formed between the electrodes 1, 2 and silent discharge is generated by applying an alternating high voltage while supplying a source material gas 8 containing oxygen to the discharge gap 12. The method for setting the electrode unit comprises measuring a compounded electrostatic capacitance formed by the dielectric layer 3 and the discharge gap 12 between the coaxial cylindrical metal electrodes 1, 2 and employing positions and a combination of the electrodes giving the maximum compounded electrostatic capacitance so as to minimize the variance of the discharge gap 12. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an ozone generator that generates ozone from oxygen or oxygen-containing gas by silent discharge through a discharge gap, and relates to an ozone generator used for water and sewage treatment, pulp bleaching treatment, sterilization treatment, and the like, and setting of an electrode unit thereof Regarding the method.

Ozone is used in a wide range of fields such as water treatment facilities by utilizing its sterilizing, decolorizing and deodorizing power. As an example of a conventionally used ozone generator, a coaxial cylindrical tube type ozone generator tube is known, and a schematic diagram thereof is shown in FIG.
FIG. 3 shows a configuration in which two cylindrical metal high-voltage electrodes 1 and a cylindrical metal ground electrode 2 facing each other and a dielectric 3 are arranged on one of them.
In FIG. 3, the dielectric 3 is disposed on the surface of the cylindrical metal high-voltage electrode 1 located inside, and the cylindrical metal ground electrode 2 is disposed outside the cylindrical metal high-voltage electrode 1. Between the cylindrical metal high voltage electrode 1 and the cylindrical metal ground electrode 2, an electrode unit is formed in which a discharge space 4 having a discharge gap 12 is formed.

The cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2 are applied with an AC high voltage by an AC high-voltage power source 7 to generate a silent discharge in the discharge space 4, and the discharge column 10 shown in FIG. Will appear.
In addition, a raw material gas 8 containing oxygen flows into the discharge space 4, and oxygen in the raw material gas becomes ozone by the following reaction in the discharge space 4 and is generated as an ozonized gas 9.
O2 + e → O + O + e (1)
O2 + O + M → O3 + M (M: third body) (2)

FIG. 4 is an example of a planar electrode type ozone generator. In this case, the electrode structure basically has a form in which the cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2 in FIG.
In FIG. 4, as described above, the structure is replaced with the planar electrode 11 and is basically the same. Although not clearly shown in the figures, the ozone generators shown in FIGS. 3 and 4 are cooled by adding an electrode cooling device to one or both sides of the electrode.

In order to generate the discharge efficiently, the geometry of the discharge gap 12 formed between the coaxial cylindrical electrodes, particularly concentricity, is important. The holding of the discharge gap 12 is generally configured by welding or inserting a thin plate made of stainless steel or installing a wire or the like. In Patent Document 1 (Japanese Patent Laid-Open No. 4-214003), a coaxial cylindrical electrode is used. As a means for improving the concentricity of the metal, a constant discharge gap 12 is formed by using a metal spring member (spacer) as a support between the cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2. It is proposed to hold for a long time.

JP-A-4-214003

However, in the above-mentioned Patent Document 1, besides using a spacer (metal spring member) to ensure concentricity, the bending of the electrode also greatly affects the uniformity of the discharge gap 12.
This is a process of manufacturing a cylindrical electrode, and the cylindrical electrode is bent with respect to the axial direction due to heat processing or the like. In particular, when an electrode having a large length in the axial direction is manufactured, the bending becomes large, and therefore the discharge gap 12 of the discharge space 4 formed in the coaxial cylindrical tube is not uniform.

Therefore, even if a spacer for making the discharge gap 12 uniform is provided, a region that is not suitable for the conditions in which discharge occurs in the space due to the bending of the cylindrical electrode is formed, and it becomes difficult for the region to be discharged. There is a concern that the generation efficiency of 9 is reduced.
In this case, the cross-sectional area of the spring member used as the spacer is larger than the longitudinal direction of the pipe, which is the gas flow direction, and pressure loss occurs due to the inhibition of the gas flow, resulting in a decrease in ozone generation efficiency. There is a fear.

  The present invention has been made in view of such a situation, and its purpose is to accurately determine the conditions under which the discharge gap in the discharge space is most uniform among the combinations of cylindrical electrodes to be used, and to improve efficiency. Another object of the present invention is to provide an ozone generator for obtaining means for generating ozonized gas and a method for setting an electrode unit thereof.

In order to solve the above-described problems of the prior art, the present invention is configured such that at least one electrode of coaxial cylindrical metal electrodes arranged to face each other is covered with a dielectric, and the gap is between the electrodes. A method for setting an electrode unit of an ozone generator having an electrode unit that generates a silent gap by applying an alternating high voltage while forming a discharge gap and supplying a source gas containing oxygen to the discharge gap, In the coaxial cylindrical metal electrode tube, a synthetic capacitance formed by the dielectric and the discharge gap is measured, and the coaxial cylindrical metal electrode disposed so as to face the position where the synthetic capacitance is maximum. It is set to minimize the variation of the discharge gap by employing the combination of.

  In the present invention, it is preferable that an allowable range of bending in the discharge gap space is set in advance, and a combination of the cylindrical metal high voltage electrode and the cylindrical metal ground electrode within the allowable range is selected and adopted.

Further, the present invention is configured such that at least one of the coaxial cylindrical metal electrodes arranged to face each other is covered with a dielectric, and a discharge gap is formed between the electrodes. In an ozone generator having an electrode unit that generates a silent discharge by applying an alternating high voltage while supplying a source gas containing oxygen, between the coaxial cylindrical metal electrodes arranged opposite to each other, the dielectric And measuring means for measuring the synthetic capacitance formed by the discharge gap, and rotating the coaxial cylindrical metal electrode in a state where the coaxial cylindrical metal electrode is connected, the synthetic capacitance is obtained. measured by the measuring means, in the coaxial cylindrical metal electrode tube, combination of the combined capacitance becomes the maximum value position and oppositely disposed said coaxial cylindrical metal electrodes The ozonized gas is generated by using the coaxial cylindrical metal electrode tube set to minimize the variation in the discharge gap.

As described above, in the method of setting the electrode unit of the ozone generator according to the present invention, the combined capacitance formed by the dielectric and the discharge gap is measured with a coaxial cylindrical metal electrode tube, and the combined capacitance is measured. The variation of the discharge gap is set to the minimum by adopting a combination of the coaxial cylindrical metal electrodes disposed opposite to the position where the maximum value is obtained. The capacitance is inversely proportional to the distance between the electrodes, and the thickness of the layer formed by the dielectric does not change. Therefore, the combined capacitance is maximized under the condition that the variation in the average distance of the discharge gap is minimized.
Therefore, the variation in the average distance of the discharge gap can be set to the minimum by adopting the combination of the coaxial cylindrical metal electrodes disposed opposite to the position where the combined capacitance becomes the maximum value.

  Therefore, when using an electrode having such a bend, it is possible to form a variation in the discharge gap to a minimum value, so that a discharge occurs in a wide area on the surface of the coaxial cylindrical electrode, and the source gas is more efficiently used. Can be converted into ozonized gas.

  Further, in the present invention, an allowable range of bending in the discharge gap space is set in advance, and a combination of the cylindrical metal high voltage electrode and the cylindrical metal ground electrode within the allowable range is selected and adopted. A combination of the cylindrical metal high-voltage electrode and the cylindrical metal ground electrode within the range can be easily selected.

Furthermore, in the ozone generator according to the present invention, a measuring means for measuring a synthetic capacitance formed by a dielectric and a discharge gap is connected between coaxial cylindrical metal electrodes arranged opposite to each other, and the coaxial wherein said combined capacitance measured by said measuring means by rotating one of the coaxial cylinder metal electrodes, in said coaxial cylindrical metal electrode tube, the combined capacitance is maximum in a state that connects the cylindrical metal electrodes By using the coaxial cylindrical metal electrode tube set to minimize the variation in the discharge gap by adopting a combination of the coaxial cylindrical metal electrodes arranged at opposite positions and facing each other, ozonized gas is produced. Since it is configured to generate, the same effect as the above invention can be obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, an ozone generator according to the present invention and a method for setting an electrode unit thereof will be described in detail based on the embodiments with reference to the drawings.
FIG. 1 is a schematic diagram of an electrode unit at the time of adjustment for minimizing the influence of bending of a cylindrical metal high-voltage electrode according to an embodiment of the present invention, and FIG. 2 minimizes the influence of bending of the cylindrical metal high-voltage electrode. It is the electrode unit schematic diagram of a coaxial cylindrical tube type ozone generator when it did.

As shown in FIGS. 1 and 2, an ozone generator 100 according to an embodiment of the present invention is configured so that an outer electrode is made of metal among two electrodes that are arranged to face each other and are configured in a coaxial cylindrical shape. A cylindrical metal ground electrode 2 is used, and an inner electrode is a cylindrical metal high voltage electrode 1 made of metal. A dielectric layer 3 is formed on the outer peripheral surface of the cylindrical metal high voltage electrode 1 by applying a dielectric. It is. For this reason, the outer peripheral surface of the cylindrical metal high-voltage electrode 1 is covered with the dielectric layer 3. A discharge space 4 is formed between the cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2.
An LCR meter (measuring means) 5 is connected between the coaxial cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2, and the dielectric layer 3 is connected to the LCR meter 5. And the combined capacitance of the discharge space 4 is measured.

The synthetic capacitance is measured by rotating either the cylindrical metal high-voltage electrode 1 or the cylindrical ground electrode 2 with the two electrodes 1 and 2 connected as shown in FIG. ing.
In the case of FIG. 1, when the cylindrical metal high-voltage electrode 1 is moved in the rotation direction 6 and measured by the LRC meter 5, the synthetic capacitance also changes as needed because the discharge gap 12 changes.

As shown in FIG. 2, when the bending directions of the cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2 are the same, the variation of the discharge gap 12 in the discharge space 4 is maximized, The combined capacitance is minimized.
Since the capacitance is inversely proportional to the distance between the electrodes 1 and 2, the thickness of the dielectric layer 3 formed by the dielectric does not change in this case, so that the variation in the average distance of the discharge gap 12 is minimized. In this case, the combined capacitance becomes the maximum.
Therefore, the variation in the average distance of the discharge gap 12 can be set to the minimum by adopting the position and combination where the combined capacitance becomes the maximum value.
That is, by using the method of the embodiment of the present invention, the variation of the very narrow discharge gap 12 can be set to the minimum value.

  Although not clearly shown in the drawing, as an example of an electrode having a bend other than that shown in FIG. 1, even when the electrode is wavy in the axial direction, the variation of the discharge gap 12 is minimized by the method of the embodiment of the present invention. Can be adjusted. When the electrodes 1 and 2 having such a bend are used, it is possible to form the variation in the discharge gap 12 to the minimum value, so that a discharge occurs in a wide area on the surface of the coaxial cylindrical electrode, and the source gas 8 Can be more efficiently converted into the ozonized gas 9 (see FIG. 3).

In addition, regarding the bending of the electrodes 1 and 2, an allowable bending range is set in advance according to the space of the discharge gap 12 to be formed, and the electrodes 1 and 2 within the allowable range are employed.
For example, as a method for selecting a combination of the electrodes 1 and 2, the cylindrical metal high-voltage electrode 1 and the cylindrical metal ground electrode 2 that are within the allowable range of electrode bending are selected.
Then, the cylindrical metal ground electrode 2 is fixed, the cylindrical metal high voltage electrode 1 is inserted inside, and the cylindrical metal high voltage electrode 1 is rotated in the rotation direction 6 at a predetermined position of the cylindrical metal high voltage electrode 1. If it is possible to make one rotation without stopping in the middle, the electrodes 1 and 2 can be arranged without contacting each other except for the gap spacer.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various changes and modifications can be made based on the technical idea of the present invention.

It is a schematic diagram which shows the electrode unit at the time of adjustment for minimizing the influence of the bending of the cylindrical metal high voltage electrode which concerns on embodiment of this invention. It is a schematic diagram which shows the electrode unit of a coaxial cylindrical tube type | mold ozone generator when the influence of the bending of the cylindrical metal high voltage electrode which concerns on the said embodiment is minimized. It is a schematic diagram corresponding to FIG. 1 which shows an example of the conventional coaxial cylindrical tube type | mold ozone generator. It is a schematic diagram corresponding to FIG. 1 which shows an example of the conventional flat type ozone generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical metal high voltage electrode 2 Cylindrical metal ground electrode 3 Dielectric layer 4 Discharge space 5 LCR meter 12 Discharge gap
100 Ozone generator

Claims (3)

At least one of the coaxial cylindrical metal electrodes arranged opposite to each other is composed of a surface covered with a dielectric, a discharge gap is formed between the electrodes, and a source gas containing oxygen is formed in the discharge gap. A method for setting an electrode unit of an ozone generator having an electrode unit that generates silent discharge by applying an alternating high voltage while supplying,
In the coaxial cylindrical metal electrode tube, a synthetic capacitance formed by the dielectric and the discharge gap is measured, and the coaxial cylindrical metal electrode disposed so as to face the position where the synthetic capacitance is maximum. A method for setting an electrode unit of an ozone generator, wherein the variation in the discharge gap is set to a minimum by employing a combination of the above.   The ozone according to claim 1, wherein an allowable range of bending in the discharge gap space is set in advance, and a combination of a cylindrical metal high-voltage electrode and a cylindrical metal ground electrode within the allowable range is selected and adopted. A method for setting the electrode unit of the generator. At least one of the coaxial cylindrical metal electrodes arranged opposite to each other is composed of a surface covered with a dielectric, a discharge gap is formed between the electrodes, and a source gas containing oxygen is formed in the discharge gap. In an ozone generator having an electrode unit that generates silent discharge by applying an alternating high voltage while supplying,
Between the coaxial cylindrical metal electrodes arranged facing each other, a measuring means for measuring a synthetic capacitance formed by the dielectric and the discharge gap is connected, and the coaxial cylindrical metal electrodes are connected in a state of being connected. the combined capacitance measured by said measuring means by rotating one of the coaxial cylinder metal electrodes, in said coaxial cylindrical metal electrode tube, arranged said combined capacitance is positioned and faces a maximum value By adopting the combination of the coaxial cylindrical metal electrodes formed, the coaxial cylindrical metal electrode tube set to minimize the variation in the discharge gap is used to generate ozonized gas. Ozone generator.

Images