JPH07277708A - Ozone generator - Google Patents

Abstract

PURPOSE:To obtain an ozone generator designed to enable cost reduction through obviating oxygen waste even in generating high-concentration ozone by combining an oxygen-enriching device, a means to guide a mixed gas, an oxygen analyzer, an ozone analyzer, and a control means so as to make a specification. CONSTITUTION:This ozone generator is so designed as to be equipped with a compressor 1, an oxygen-enriching device 2, an ozone generation vessel 3, an oxygen analyzer 4, a control box 6, an ozone analyzer 5, etc. The high- concentration oxygen produced by the oxygen-enriching device is mixed with a compressed air from the compressor 1 and introduced into the ozone generation vessel 3. The control box 6, when ozone concentration is given as a command value, determines respective optimal oxygen concentration, gas flow, and input electric power, based on the respective detection values from the oxygen analyzer 4 and the ozone analyzer 5, controlling these parameters. Thereby, a feedstock gas with a desired oxygen concentration can be introduced into the ozone generation vessel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the efficiency of an ozone generator for producing ozone used in water treatment or the like on an industrial scale.

[0002]

2. Description of the Related Art The very strong oxidizing power of ozone has been used in many fields including water purification treatment. Also,
In recent years, a larger capacity ozone generator has been demanded such as being used for sewage treatment. Therefore, it is desired to use oxygen instead of air as a raw material because of the necessity of downsizing the device. Further, when ozone is used for treatment of industrial wastewater, sterilization in the manufacturing process of foods, etc., high concentration of ozone may be required, and in this respect also the necessity of using oxygen as a raw material has arisen. .

In an ozone generator using oxygen as a raw material, an oxygen enrichment device or the like is provided and 90% or more of oxygen is supplied to an ozone generating container. Since a large amount of energy is consumed for concentrating oxygen from the air, it is necessary to recycle it and use it efficiently as a raw material for ozone generation. This method has been variously studied and some have been put to practical use.

[0004]

When a high concentration of ozone is required for industrial use, it is conceivable to use oxygen as a raw material or to ignore the efficiency and increase the power density. . If oxygen is used as a raw material, high-concentration ozone can be easily obtained unless the time and effort for producing the oxygen is spared, which is useful. However, the ozonized gas is naturally rich in oxygen, which may be disliked in some cases.

When air is used as a raw material and the power density is extremely increased, not only the efficiency is lowered, but also the temperature rise of the glass tube in the ozone generating container is increased, and it is necessary to reexamine the cooling method. .

The relationship between the oxygen concentration and the ozone generation efficiency is linear, and the higher the oxygen concentration, the better the efficiency. On the other hand, the higher the oxygen concentration, the larger the amount of compressed air required, thus increasing the compressor loss and degrading the system efficiency.

The present invention has been made in view of the above points, and an object thereof is to generate high-concentration ozone.
While reducing waste of oxygen and realizing cost reduction,
An object of the present invention is to provide an ozone generator capable of operating efficiently according to an ozone concentration command value.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a dielectric having a high voltage electrode provided on one surface and a ground electrode provided on the other surface of the dielectric side by side with a gap therebetween are housed. (1) Oxygen in compressed air, comprising an ozone generating container configured to generate ozone in the raw material gas flowing in the gap by applying a voltage between the high-voltage electrode and the ground electrode. An oxygen enrichment device for enriching the oxygen to obtain high concentration oxygen, a means for mixing the high concentration oxygen obtained by the oxygen enrichment device and the compressed air to lead to the ozone generating container, and introducing to the ozone generating container. An oxygen densitometer for detecting the oxygen concentration of the source gas to be blown, an ozone densitometer for detecting the concentration of ozone generated in the ozone generating container, and the ozone based on the respective detected values of the oxygen densitometer and the ozone densitometer. Raw material guided into the generating container Control means for controlling the oxygen concentration of the gas, the gas flow rate and the input electric energy, and (2) a nitrogen enriching device for concentrating and removing nitrogen in compressed air, and the nitrogen enriching device. Means for mixing the remaining gas after being removed with the compressed air with the compressed air, an oxygen concentration meter for detecting the oxygen concentration of the raw material gas introduced into the ozone generation container, and the ozone generation container Ozone concentration meter to detect the concentration of ozone generated in, the oxygen concentration of the raw material gas introduced into the ozone generation container, the gas flow rate and the input power amount, based on the detection values of the oxygen concentration meter and the ozone concentration meter And a control means for controlling the.

[0009]

[Action]

(1) In the invention according to claim 1, since the control means controls based on the detection value of each densitometer, when the ozone concentration is given as the command value, the optimum oxygen concentration, gas flow rate, and input power are obtained. Controlled by quantity.

Since a part of the compressed air is enriched by the oxygen enriching device, a desired high concentration of oxygen can be obtained without increasing the amount of compressed air. Therefore, compressor loss is reduced.

(2) In the invention described in claim 2, since the nitrogen enriching device releases and removes the concentrated nitrogen, the remaining gas contains a large amount of oxygen. Since the control means performs control based on the detected value of each densitometer, when the ozone concentration is given as a command value, it is controlled to the optimum oxygen concentration, gas flow rate, and input power amount.

This device has a problem with an oxygen-rich gas, and it is an optimum device when it is desired to raise the ozone concentration to a little higher than that of the air raw material. As a result, a waste ozone is eliminated, and an ozone generator with low cost and high operating efficiency is constructed.

Since a part of the compressed air is enriched by the nitrogen enriching device, a desired high concentration of oxygen can be obtained without increasing the amount of compressed air. Therefore, compressor loss is reduced.

Further, since an expensive oxygen enrichment device is not used,
The initial cost of the system can be significantly reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a compressor that compresses air, and 2 is an oxygen enrichment device that enriches a part of the compressed air of the compressor 1 to obtain high concentration oxygen, for example, 90% oxygen. The compressed air of the compressor 1 and the high-concentration oxygen obtained in the oxygen enrichment device 2 are mixed and guided to the ozone generation container 3.

In the ozone generation container 3, for example, a glass dielectric tube having a high voltage electrode provided on one surface thereof and a ground electrode tube provided on the other surface of the dielectric tube at a discharge gap side by side. Are housed (not shown), and a high frequency voltage is applied to the high voltage electrode to generate ozone in the raw material gas introduced into the discharge gap.

Reference numeral 4 is an oxygen concentration meter for detecting the oxygen concentration of the raw material gas introduced into the ozone generation container 3, and reference numeral 5 is an ozone concentration meter for detecting the concentration of ozone generated in the ozone generation container 3. Reference numeral 6 denotes the ozone generation container 3 based on the detection values of the oxygen concentration meter 4 and the ozone concentration meter 5.
It is a control box for controlling the oxygen concentration of the raw material gas introduced into the chamber, the gas flow rate, and the input power amount.

Reference numerals 7 and 8 are respectively inserted into respective flow paths connecting the compressor 1, the oxygen enrichment device 2 and the ozone generating container 3,
It is a valve whose opening is controlled by a command from the control box 6.

In the ozone generator constructed as described above, the high-concentration oxygen obtained in the oxygen enrichment device 2 is mixed with the compressed air of the compressor 1 to form the ozone generator container 3.
Be led to. When the ozone concentration is given as a command value, the control box 6 obtains the optimum oxygen concentration, gas flow rate, and input power amount based on the detection values of the oxygen concentration meter 4 and the ozone concentration meter 5, and controls them. . By the control of the control box 6, the raw material gas having a desired oxygen concentration is introduced into the ozone generating container 3.

Since the ozone concentration is controlled as the command value as described above, efficient operation can be performed even when a high concentration ozone is generated. Further, it is possible to construct a low-cost ozone generator by eliminating waste of oxygen. Especially Figure 1
This device is the most suitable device when high concentration ozone is required and there is no problem with oxygen-rich gas.

Next, an embodiment suitable for the case where it is desired to raise the ozone concentration to a level slightly higher than that of the air raw material, that is, when oxygen rich is a problem, will be described with reference to FIG. In FIG. 2, FIG.
The same parts as are indicated by the same reference numerals.

2 is different from FIG. 1 in that a nitrogen enriching device 12 is used instead of the oxygen enriching device 2.
Other parts are configured the same as in FIG. The nitrogen enriching device 12 is composed of, for example, a membrane-separation type nitrogen generating device, concentrates nitrogen in the air compressed by the compressor 1 (90% nitrogen gas) and releases it, and contains a large amount of residual oxygen. A gas, for example 40% oxygen, is obtained.

Also in the case of the above configuration, the oxygen concentration in the raw material gas introduced into the ozone generating container 3 can be adjusted as in the case of FIG. That is, the nitrogen enrichment device 1
The oxygen-rich gas obtained in 2 is mixed with the compressed air of the compressor 1 and introduced into the ozone generating container 3. When the ozone concentration is given as a command value, the control box 6 obtains the optimum oxygen concentration, gas flow rate, and input power amount based on the detection values of the oxygen concentration meter 4 and the ozone concentration meter 5, and controls them. . By the control of the control box 6, the raw material gas having a desired oxygen concentration is introduced into the ozone generating container 3.

Since the ozone concentration is controlled as the command value as described above, efficient operation can be performed even when a high concentration ozone is generated. Further, it is possible to construct a low-cost ozone generator by eliminating waste of oxygen.

[0025]

As described above, according to the inventions described in claims 1 and 2, (1) when a high concentration of oxygen is required, a waste of oxygen is omitted and a low-cost ozone generator is constructed. be able to.

(2) Since the ozone concentration is controlled as the command value, efficient operation can be performed even when a high concentration ozone is generated.

(3) Since nitrogen in the raw material is removed by the nitrogen enriching device, generation of nitrogen oxides can be suppressed. Even when an oxygen enrichment device is used, enriching oxygen is synonymous with removing nitrogen in the raw material and can suppress the generation of nitrogen oxides.

Further, according to the invention described in claim 2, (4) it is most suitable when particularly high ozone is not required, and in this case, an expensive oxygen enrichment device is not used, so the system initial The cost can be reduced significantly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the invention described in claim 1.

FIG. 2 is a configuration diagram showing an embodiment of the invention described in claim 2.

[Explanation of symbols]

 1 ... Compressor 2 ... Oxygen enriching device 3 ... Ozone generating container 4 ... Oxygen concentration meter 5 ... Ozone concentration meter 6 ... Control box 7, 8 ... Valve 12 ... Nitrogen enriching device

Claims (2)

[Claims] 1. An ozone generation container comprising a dielectric having a high-voltage electrode provided on one surface thereof and a ground electrode arranged in parallel on the other surface of the dielectric with a gap therebetween, An ozone generator for generating ozone in a raw material gas circulated in the void by applying a voltage between the high voltage electrode and a ground electrode, wherein oxygen in the compressed air is enriched to obtain high concentration oxygen. And a means for mixing the high-concentration oxygen obtained by the oxygen enriching device and the compressed air to the ozone generating container,
An oxygen concentration meter for detecting the oxygen concentration of the raw material gas introduced to the ozone generation container, an ozone concentration meter for detecting the concentration of ozone generated in the ozone generation container, and the respective detected values of the oxygen concentration meter and the ozone concentration meter. Based on the above, an ozone generating apparatus comprising: a control means for controlling the oxygen concentration of the raw material gas introduced into the ozone generating container, the gas flow rate, and the input power amount. 2. An ozone generating container having a dielectric having a high-voltage electrode provided on one surface thereof and a ground electrode arranged in parallel on the other surface of the dielectric with a gap therebetween, In an ozone generator for applying a voltage between the high-voltage electrode and a ground electrode to generate ozone in the raw material gas that has been circulated in the void, a nitrogen enricher for concentrating and removing nitrogen in compressed air, ,
A means for mixing the remaining gas after being removed by the nitrogen enriching device and the compressed air and guiding the mixture to the ozone generation container, and an oxygen concentration meter for detecting the oxygen concentration of the raw material gas introduced to the ozone generation container. The ozone concentration meter for detecting the concentration of ozone generated in the ozone generation container, and the oxygen concentration of the raw material gas introduced into the ozone generation container based on the detected values of the oxygen concentration meter and the ozone concentration meter, gas An ozone generator comprising: a control unit that controls a flow rate and an input power amount.