JPS58114727A - Active seed generator - Google Patents

Abstract

PURPOSE:To perform electric discharge stably even with voltage lower than the voltage in the prior art and to improve the generating efficiency of ozone by using fillers consisting of metallic wires for an electric discharge electrode or power feed electrode in an ozonizer. CONSTITUTION:Al foil 13 as a power feed electrode is wound on the outer side of a dielectric 11 which is a glass tube made of ''Pyrex '' in an ozonizer. Fillers 12 produced by winding stainless steel wire screens of proper openings to cylindrical shapes and wire nets 14 for holding the same are beforehand put in the dielectric 11 of the glass tube. While electric discharge is caused between the fillers 12 and the dielectric 11 by applying voltage between the electrode 13 and the nets 14, gaseous oxygen is passed through the inside of the dielectric 11 and part of oxygen is converted to ozone. The stable discharge is accomplished with the voltage lower than the voltage in conventional devices and ozone is generated with high generation efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can efficiently generate active species at low voltage.

As one of the devices for generating active species, an ozonizer that generates ozone using silent discharge is well known. This ozonizer was basically devised by Germany's W, Siemens (8i・wIns) K, and consists of a double glass tube with an inner tube and an outer tube, with the inner tube on the inside and the outer tube on the outside. A tin foil is stretched 9, a high alternating current voltage is applied by a sensitive coil to create a silent discharge between the inner and outer tubes, and dry air or oxygen is sent from one end of the tube into the gap between the inner and outer tubes. Then, the ozone-air (oxygen) mixed gas is obtained from the other end.

Therefore, the configuration of the discharge section of the current ordinary silent discharge ozonizer includes a power supply electrode 1-dielectric material 2 as shown in FIG.
- Gap 5 - Dielectric 2 - Feeding electrode 1 There is a full type type, and a so-called semi-type of feeding electrode 1 - dielectric 2 - void @ 5 - metal discharge electrode 4 as shown in Fig. 2. However, the few air gaps between the two electrodes are an important component of the ozonizer. It is said that the smaller the distance between the two electrodes (width of the gap), the lower the voltage will be used to discharge and the more efficiently ozone can be obtained.

In the above, a metal foil such as a tin foil is usually used as the power supply electrode, glass or the like is used as the dielectric material, and stainless steel or the like is used as the metal discharge electrode. Industrially, either the power supply electrode 1@electric body 2 or the metal discharge electrode 4 is connected to the outer tube A1 and the inner tube B to form a double tube as long as possible.

However, in order to obtain a more uniform discharge than before, it is necessary that each part between the two electrodes be equally spaced, and for this reason, it is said that the electrode surface needs to be smooth. was. In fact, when both electrodes are not parallel, discharge occurs only at the closest distance between the two electrodes, and a uniform discharge does not occur. Therefore, the larger the electrode, that is, the longer the inner tube and outer tube, the more difficult it is to maintain the air gap correctly, making it difficult to obtain an efficient ozonizer.

As a result of various research on ozonizers, the present inventors found that
We learned that ozone is generated not only between the power supply electrode and the discharge electrode, but also around these electrodes depending on the conditions.

Based on this knowledge, the present inventors conducted various studies on plow electrodes, and found that the electrodes do not necessarily have to be in the form of a thin sheet like the tin foil electrodes used in conventional devices; other shapes may also be used. Often, by adjusting the amount of space around the electrode by using a filler made of metal wire or f-mesh instead of the wire mesh electrode, it is possible to stabilize the discharge even at lower voltages and increase the ozone generation efficiency. I found out what I got.

That is, the device of the present invention uses a filler made of a metal wire material as a discharge electrode and/or a power supply electrode, and the thinness of the metal wire of the filler type electrode, the dimensions of the filler, the shape, the amount of the filler, and the opposing By optimizing the relative position with the electrode, and by selecting the material, shape, etc. of the dielectric material, components including the dielectric material can be selected in accordance with the desired product. It is characterized by being able to obtain the best conditions for.

The shape of the filler type electrode made of a metal wire used in the present invention is not particularly limited, but for example, a 6 metal fy-hI) made of a thin metal wire! It may be of a fixed shape, or it may be a wire mesh cylindrical backing for a Dixon distillation column.

As the metal wire, a corrosion-resistant wire, such as a stainless steel wire, which will not be damaged during the active species generation reaction, is used. Although it is not particularly limited as a light train, for example, 107~t
Choose from 5■.

Furthermore, by selecting the material of the metal wire material, for example by using a metal with a small work function, it is possible to easily generate electrons from the metal electrode, and in addition to selecting the various conditions mentioned above, it is possible to further lower the voltage and increase efficiency. You can also do it.

As the solid dielectric, glass and ceramic, which have been conventionally used for this type of application, can be used. The shape may be cylindrical as in the conventional case, but any shape such as a flat plate may be used.

The shape of the device may be such that the solid dielectric is a cylinder, a metal foil is attached to the outer periphery of the cylinder to serve as one pole, and the inside of the cylinder is filled with the above-mentioned filler. For example, a dielectric material may be formed on a double cylindrical body consisting of an inner cylinder and an outer cylinder, and a filler may be filled inside the inner cylinder and between the inner cylinder and the outer cylinder.

Next, the present invention will be explained with reference to examples.

FIG. 3 is a schematic cross-sectional view showing an example of the device of the present invention, in which a glass tube as a 11Fi solid dielectric is shown, 12 is a filler filled in the glass tube 11, and 13 is a glass tube 11.
An aluminum foil is wound around the outer periphery of the electrode as a power supply electrode, and 14 indicates a wire mesh holding the filler 12.

In this example, the Pyrex glass tube 11 has a wall thickness (18
■The inner diameter of the filling material 12 loading part is 18-1 and the length is approximately 200■
I used the one from In addition, 50 pieces of aluminum foil were wrapped around the glass tube 11.

As the packing material, we used a stainless steel backing for a Dixon distillation column (see Figure 4), which was made by winding a stainless steel wire mesh with an appropriate opening into a cylindrical shape, and used an ASB with the specifications shown in Table 1.
Two types were used.

As a comparative example, a normal double cylindrical (Siemens type) device (Todoroki C) was used.

As a result, in Todoroki C, ozone is generated only at a discharge starting voltage or higher.If oxygen gas is passed through the device shown in Fig. 5 at a rate of 232/sec, ozone can be generated at a rate of t57 μmolJ' at the maximum value. Incidentally, the relationship between applied voltage and ozone generation efficiency is shown in FIG. In FIG. 5, AAS Mum B shows the results of the apparatus using filler Mum A1 Mum B, and AC
shows the results for a conventional Siemens-type device. The amount of filling material Mu A charged into the apparatus was α2529/al, and that of Mu B was 1469 f/-.

As can be seen from the results in Figure 5, when using the conventional device (AC), the ozone generation efficiency does not change even if the applied voltage increases, but when using the device of the present invention (MUAS B), the voltage increases. The generation efficiency is maximum at . Furthermore, this maximum value point differs depending on the type of filler. Note that the efficiency and voltage at this maximum point can be further changed by changing the material, shape, etc. of the dielectric material, as well as the material, shape, and pressure of the filler. Therefore, according to the device of the present invention, it is possible to activate not only the oxidation reaction but also other gases such as nitrogen gas, and it can be widely used to promote other general gas phase reactions. .

The device of the present invention is easy to manufacture because it does not require difficult steps such as keeping the distance between the electrodes constant as in conventional methods, increases the efficiency of generating the desired active species, and can stabilize discharge at an extremely low voltage. It has the following advantages.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing the configuration of a discharge section of a conventional device, FIG. 3 is a schematic cross-sectional view showing an example of the device of the present invention, and FIG. 4 is a perspective view showing an example of a filler. FIG. 5 is a graph showing the relationship between applied voltage and ozone generation efficiency. In the figure, 1... feeding electrode, 2... dielectric 3... void, 4... metal discharge electrode 11... glass tube (II electric body), 12... filler 13... ... Aluminum foil (power supply electrode) 14 ... Wire mesh procedural amendment November 27, 1980 Commissioner of the Japan Patent Office -- Mr. Kaikai Name: Active species growth device 3, Relationship with the amended person case: Patent applicant (name) 5. Date of amendment order 7, Existence of amendment (1) “Even in shape” at the end of page 3 of the specification ``Even if it's shaped like a wire mesh,'' I corrected it. (2) Same #! In the first line of page 4, "Wire mesh electrode" is corrected to "Rough wire mesh electrode." (s) Correct the ``even lower'' position in the 4th line @ 3rd line to ``lower than before''. (4) Correct "shape filler" t "shape. filler" in the 9th line of the 4th member. (6) Same #! 4. ``Cylindrical wire mesh'' in the second line from the bottom [Corrected as ``cylindrical with wire mesh.'' (6) Same gs * 5th line ro, 0'1~1.5■"
t is corrected as “α01-1.5 cod”. (1) Correct the term ``ceramic houndstooth molecular materials'' in the ``ceramics'' column in line 12 of the 5th chapter of the same text. (8) No. 7jiIII, line 122 from the bottom r23j/
Correct as "second" tr23allJJ (9) Same $117jij lower or 64th line 1&5hdO
rf/m” trf/mu. - Correct the ``filling amount'' on the 5th line from the bottom of the 7th line as t ``the filling time is 1!F direct''.

Claims (1)

[Claims] A filling material made of a metal wire is provided as one electrode in contact with one surface of a solid dielectric material, and a filling material similar to the above or a metal sheet is provided as a counter electrode in contact with the other surface of this dielectric material. An AC discharge type active species generator characterized by the following.