JP2553338B2 - Liquid ozone production equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for producing liquid ozone used for sterilization, disinfection, bleaching, and other general oxidation.

2. Description of the Related Art As one of the conventional liquid ozone production apparatuses, a plurality of linear discharge electrodes are provided on the inner surface of a cylindrical dielectric, and are guided in the thickness of the cylindrical dielectric or on the outer surface thereof. Electrodes are provided, and AC high voltage or pulse voltage is applied between these electrodes,
In an ozonizer that generates a creeping discharge on the inner surface, there is a device that cools and liquefies the ozone gas generated here by another device.

Since this device supplies oxygen gau or air to the creeping discharge area and generates ozone gas while flowing through the creeping discharge area, when passing through the creeping discharge area, a part of ozone once generated is Since it is decomposed by the creeping discharge itself and returns to oxygen again, the ozone generation efficiency decreases.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention aims at improving ozone gas generation efficiency by preventing ozone gas once generated in the creeping discharge area from returning to oxygen again.

Another purpose is to cool the generated ozone gas below the liquefaction temperature to liquefy it and trap it on the inner surface of the tubular dielectric.

Another object is to cool the ozone gas produced in the production zone to lower the pressure in the ozone gas production zone, and to supply new oxygen to the zone automatically by this reduction phenomenon.

Still another object is to prevent the liquefied ozone from adhering to one side surface of the cylindrical dielectric body provided with the corona discharge electrode to prevent the creeping discharge.

Means for Solving the Problems In the liquid ozone manufacturing apparatus of the present invention, a gas flow passage is provided between the cylindrical dielectric and the ozone liquefaction section, and a linear corona electrode is provided on the gas flow passage side of the cylindrical dielectric. A planar induction electrode is provided so as to face the linear corona electrode and through at least a part of the wall thickness of the tubular dielectric, and an ozonizer by creeping discharge in which a high-voltage AC power supply is connected between both electrodes is provided. At this time, the temperature of the ozone liquefaction part is strongly cooled below the liquefaction temperature of ozone, and the temperature of the tubular dielectric is cooled above the liquefaction temperature of ozone from the opposite side of the gas flow passage and generated in the gas flow passage. The ozone is adhered to the ozone liquefaction section by thermal diffusion.

A high AC voltage is applied between the corona electrode and the planar induction electrode to generate a creeping discharge on the surface of the cylindrical dielectric corona electrode on which oxygen gas or air is supplied. Generates ozone gas. At this time, the ozone liquefaction section facing the creeping discharge area is cooled to a temperature not higher than the liquefaction temperature of ozone gas by the auxiliary cooling mechanism, and the generated ozone gas is rapidly transported to the ozone liquefaction section by thermal diffusion, and is strongly cooled there. It becomes liquid ozone and is trapped on the surface of the ozone liquefaction part, and at the same time the volume contracts and the pressure in this part decreases.

The trapped liquid ozone flows down by gravity along the surface of the ozone liquefaction part, and flows out from the fall hole to the outside.
It is stored in a container prepared there.

Example As shown in FIG. 1, a corona electrode 3 composed of a linear electrode in this example is provided on the inner surface 2 of a cylindrical dielectric 1 made of fine ceramic or the like, and the corona electrode 3 is formed within the thickness of the cylindrical dielectric 1. By embedding the planar induction electrode 4, a part of the wall thickness of the cylindrical dielectric 1 is interposed between the linear corona electrode 3 and the planar induction electrode 4, and the linear corona electrode 3 and the planar induction electrode An AC high-voltage power supply 5 is connected between the terminals 4 and 4, and an AC high voltage is applied between them to generate a creeping discharge along the inner surface 2 of the cylindrical dielectric 1 to form a planar creeping discharge area 15.

A metal band 7 with cooling fins 6 shown in FIG. 3 is wound around the outer peripheral surface of the cylindrical dielectric 1 as shown in FIG. 2, and the outer peripheral surface 1a of the cylindrical dielectric 1 is almost entirely covered as shown in FIG. To form the cooling fins 6.

As shown in FIG. 3, the metal strip 7 is formed by bending both sides 7a, 7a of a strip-shaped metal strip 7 such as aluminum to form a groove 7b in cross section, and forming a large number of cuts on both side bent pieces 7a, 7a. It is formed into a brush shape by inserting 7c and 7c.

In this manner, a flexible tube 8 is provided outside the cooling fin 6 formed on the outer peripheral surface of the cylindrical dielectric body 1 so as to surround it, and a plurality of ejection holes 10 are formed on the cooling fin 6 side of the flexible tube 8. Liquid gas such as liquid nitrogen sent from the inlet 11 of the spiral tube 8 is sprayed from each ejection hole 10 toward the cooling fins 6, and the cooling fins 6 are strongly cooled by the cooling heat of the liquid gas to form an inner surface of the cylindrical dielectric 1. The temperature of 2 is set to -100 ° C, which is slightly higher than the liquefaction temperature of ozone gas (-112 ° C).

The outer side of the flexible tube 8 is surrounded by a heat insulating casing 12 so that the cold heat inside does not escape to the outside.

Further, a cylindrical ozone liquefaction part 14 is concentrically inserted inside the cylindrical dielectric 1, and the surface 14a and the inner surface 2 of the cylindrical dielectric 1 are inserted.
And a gas flow passage 15a is formed between

An oxygen gas supply pipe 16 is inserted in the center of the ozone liquefaction unit 14, the lower end thereof is communicated with the gas flow passage 15a, and oxygen gas adjusted to a constant pressure is fed from the oxygen gas supply pipe 16 to Creeping discharge area 15 while passing through the gas flow passage 15a
Supply to.

Further, the cooling chamber 1 is provided between the oxygen gas supply pipe 16 and the surface 14a.
7 is formed, and a liquefied gas 18 such as liquid nitrogen is injected therein,
The surface 14a is strongly cooled from the inside by the cold heat of the liquefied gas 18 to keep the surface temperature at a temperature sufficiently lower than the liquefying temperature of ozone gas of −112 ° C., in this example −130 ° C.

Oxygen gas supplied to the creeping discharge area 15 becomes ozone gas under the action of the above-mentioned creeping discharge, which immediately diffuses through the gas flow passage 15a to the surface 1 of the ozone liquefying section 14.
4a is brought into contact with this, cooled below the liquefaction temperature to become liquid ozone 19 and adheres to the surface 14a, gradually accumulating to form a layer on the surface 14a, and eventually flows down along the surface 14a by gravity. Then, it reaches the drop hole 21 through the funnel-shaped bottom surface 20 and is dripped and stored in the liquid ozone container 22 connected thereto.

Further, when the ozone gas is liquefied on the surface 14a of the ozone liquefying unit 14 as described above, the volume of the ozone gas is reduced and the pressure is reduced. Therefore, the oxygen gas is supplied through the oxygen gas supply pipe 16 to the creeping discharge area 15 where the pressure is reduced. The liquefaction of ozone and the supply of oxygen gas are continuously performed.

Advantageous Effects of Invention The present invention has the above-described configuration, and has a cylindrical ozone liquefying section 14 extending to the gas flow passage corresponding to the entire inner surface 2 of the cylindrical dielectric 1 that generates a creeping discharge, and the inside thereof. The surface of the cooling seat 17 is cooled by the cold heat of liquid nitrogen.
14a is cooled to below the ozone liquefaction temperature, and the ozone generated by the above-mentioned creeping discharge is immediately transported to the surface 14a of the ozone liquefaction part 14 by heat dissipation, where it is liquefied and adheres to the surface 14a, so it is once liquefied. Ozone gas returns to the creeping discharge region where it is not decomposed and returns to oxygen gas.

Therefore, the ozone generation efficiency can be remarkably improved as compared with the conventional one.

In addition, since the generated ozone gas is cooled and liquefied, the pressure in the creeping discharge area is reduced, and new oxygen gas can be automatically supplied to this area, and liquid ozone can be continuously generated. it can.

Although the corona electrode 3 is provided on the inner surface 2 of the cylindrical dielectric 1 in the above embodiment, the corona electrode 3 may be provided on the outer surface 1a of the cylindrical dielectric 1 at that time, along the outer surface 1a of the dielectric 1. A gas flow passage may be provided, and the ozone liquefaction portion 14 may be provided outside the dielectric flow passage 1 via the gas flow passage.

Since the ozone generation efficiency in the creeping discharge area increases as the temperature decreases, the outside of the cylindrical dielectric 1 is cooled via the cooling fins 6 as described above, and the temperature of the inner surface 2 thereof is kept sufficiently low to prevent the creeping discharge. By strongly cooling the area, the ozone generation efficiency can be significantly increased. However, if the inner surface 2 of the tubular dielectric 1 is set to the liquefaction temperature of ozone gas (-112 ° C.) or less, ozone is liquefied and adheres here as well, and creeping discharge is hindered.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the ozone gas producing apparatus of the present invention, FIG. 2 is a perspective view showing the structure of a part thereof, and FIG. 3 is a partially enlarged perspective view of FIG. 1 ... Cylindrical dielectric 2 ... Inner surface of cylindrical dielectric 3 ... Linear corona electrode 4 ... Planar induction electrode 5 ... High-voltage AC power supply 6 ... Cooling fin 8 ... Liquefied gas coil 10 ... … Spout hole 14 …… Ozone liquefaction part 18 …… Liquid ozone 20 …… Fall hole

Claims (3)

(57) [Claims] 1. A gas flow passage is provided between a cylindrical dielectric and an ozone liquefaction section, and a linear corona electrode is provided on the gas flow passage side of the cylindrical dielectric so as to face the linear corona electrode. In the ozonizer by creeping discharge in which a planar induction electrode is provided through at least a part of the wall thickness of the tubular dielectric, and a high-voltage AC power supply is connected between both electrodes, the temperature of the ozone liquefaction part is set to the value of ozone. It is strongly cooled below the liquefaction temperature, the temperature of the cylindrical dielectric is cooled above the liquefaction temperature of ozone from the opposite side of the gas flow passage, and the ozone generated in the gas flow passage is adhered to the ozone liquefaction portion by thermal diffusion. An apparatus for producing liquid ozone, which is characterized by: 2. The apparatus for producing liquid ozone according to claim 1, wherein the ozone liquefaction section is cooled by utilizing the cold heat of the liquefied gas. 3. The apparatus for producing liquid ozone according to claim 1, wherein the cylindrical dielectric is formed in a rigid direction, and a drop hole for liquid ozone is formed at a lower end portion thereof.