JPS6038322B2 - Oxygen recycling type ozone generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an oxygen recycling type ozone generator.

Because ozone has strong oxidizing and disinfecting power, it is used as an oxidizing agent in water treatment and production processes.

In this case, it is known that if the raw material gas of the ozone generator (ozonizer) is changed from air to oxygen, the amount of ozone generated will more than double, and the power consumption of the ozone generator can be significantly reduced. However, in this case, an oxygen recycling system is required to effectively utilize oxygen as the raw material gas. FIG. 1 shows an example of a conventional ozone water treatment apparatus having this type of oxygen IJ cycle system.

In FIG. 1, 1 is an ozone generator, 2 is a reaction tower, 3 is a blower, 4 is a cooling dehumidifier, 5 is a diffuser plate, 6 is a raw material gas reservoir, and 1 is an adsorption type gas dryer. Next, the operation of this conventional device will be explained. The raw material oxygen discharged from the raw material gas reservoir 6 is converted into ozonized oxygen with an ozone concentration of usually several percent by the ozone generator 1, and is dissolved into water as fine bubbles from the diffuser plate 5 at the bottom of the reaction tower 2 and consumed. Ru. On this occasion,
Some oxygen also dissolves in the water and flows out with the water, but most of it is discharged from the water. After this exhausted oxygen is suctioned and pressurized by a blower 3, it is cooled to about 5°C by a cooling dehumidifier 4 to which low-temperature brine is sent from a refrigerator (not shown), and the moisture contained in the gas is removed. is condensed and removed as a drain. The gas exiting the cooling dehumidifier is dried in an adsorption type gas dryer 10 so that the dew point of the gas becomes -40 qo or less, and is again sent to the raw material gas reservoir 6 as raw material oxygen.
Such a circulation system is called an oxygen recycling system.
Note that an amount of oxygen equivalent to the oxygen converted to ozone and the oxygen dissolved in water and flowing out is supplied as supplementary oxygen. In addition, the adsorption type gas dryer 10 usually consists of two or more adsorbent-packed towers 11 and 12, each of which is filled with an adsorbent. In this case, when one tower is performing an operation of adsorbing and removing water, the other tower is regenerating the adsorbent by passing heated air from the gas heater 60.

After a certain period of time has passed, the switching valves 21, 22, 31, 3
By switching 2, 41, 42, 51, and 52, the operation is switched between the single tower and the pond tower, and by alternately repeating dehumidification and regeneration in the two adsorbent-packed towers, continuous discharge is achieved. Perform oxygen drying. In an ozone generator that includes the reaction tower 2 in the recycling system, it generates not only water from evaporation of treated water, but also volatile organic matter, carbon dioxide gas, and raw materials generated as a result of the reaction between organic matter dissolved in water and ozone. Volatile organic matter dissolved in the water gets mixed into the exhausted oxygen.

When these volatile organic substances and carbon dioxide gas are sent to the ozone generator 1 together with recovered oxygen, the ozone generation efficiency is greatly reduced. In particular, 100 ppm of organic matter causes a 10 to 15% decrease in ozone generation efficiency.
Although carbon dioxide gas is not as large as organic matter, it causes a decrease in ozone generation efficiency. Therefore, the adsorption type gas dryer 1 removes substances that adversely affect ozone generation as described above.
The adsorbent to be filled in this dryer 101 is selected so that it can be removed at zero speed. However, if hydrogen, carbon monoxide, low molecular weight hydrocarbons, etc. are brought in from raw water, generated as a product of reaction with ozone, or produced by corrosion in the reaction system, these gases There is no adsorbent that can effectively remove it from the recycling system and it will accumulate in the recycling system.

Moreover, these flammable gases such as hydrogen, low-molecular hydrocarbons, and carbon monoxide have low concentration limits for combustion and explosion, making the bag hawk extremely dangerous, such as ignition and explosion. This invention improves and prevents the risk of combustion ignition, explosion, etc. in the recycling system due to the accumulation of flammable gas in conventional oxygen recycling type ozone generators, as described above. The object of the present invention is to provide an ozone generator.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an apparatus according to one embodiment of the invention.

In Figure 2, 1 is an ozone generator, 2 is a reaction tower, 3 is a blower, 4 is a cooling dehumidifier, 5 is a diffuser plate, 6 is a raw material gas reservoir, and 1 is an adsorption type gas dryer. is the same as that shown in FIG. 1 described above. Reference numeral 7 denotes a combustible gas concentration detection device, which is provided between the adsorption type gas dryer 10 and the ozone generator 1 in the recycling system.

The operation of the device in this embodiment is basically the same as that in Fig. 1, but when flammable gas that cannot be removed by the adsorption gas dryer 1 accumulates in the recycling system, its concentration is detected. Detected by device 7.

When the concentration of the detected combustible gas reaches a certain value below the combustion start concentration, the detection device 7 issues a signal to stop the operation of the equipment that causes ignition of the entire or part of the ozone generator. ．． FIG. 3 shows another embodiment of the invention,
In this embodiment, a recycling type adsorption gas dryer 10
A part of the recycled gas is collected from the area between the ozone generator 1 and the ozone generator 1 and is led to a combustible gas concentration detection device 7.

The configuration and operation other than that are the same as those of the embodiment shown in FIG. 2 described above, so parts having the same configuration as in FIG. 2 are given the same reference numerals in FIG. 3, and a description thereof will be omitted. In this invention, the flammable gas concentration detection device uses catalytic combustion using a platinum wire, a semiconductor gas sensor using adsorption of combustible gas onto a semiconductor, or a flame ion detection method. It is something.

Furthermore, the present invention is not limited to water treatment, but can be widely applied to ozone generators that react ozone with liquid or solid phase objects containing organic substances.

As explained above, the present invention is equipped with a combustible gas concentration detection device, and automatically stops the operation of the ozone generator by electrical means or the like based on the concentration detection signal of this detection device. It can prevent ignition, combustion, and even explosions caused by the accumulation of flammable gases such as hydrogen, carbon monoxide, and low-molecular hydrocarbons in the recycling system, which cannot be removed by gas dryers. Even if volatile organic matter is desorbed into the recycling system due to abnormal operation of the dryer and the system becomes highly concentrated, ignition and combustion can be prevented by using the same operation, thus ensuring highly safe oxygen recycling. This has the effect of providing a type ozone generator.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing an example of a conventional oxygen recycling type ozone generator, FIG. 2 is a configuration explanatory diagram showing an ozone generator according to an embodiment of the present invention, and FIG. 3 is another embodiment of the present invention. FIG. 2 is a configuration explanatory diagram showing an example ozone generator. 1...Ozone generator, 2...Reaction tower,
3...Floor, 4...Cooling dehumidifier, 6
...... Raw material gas reservoir, 7... Combustible gas concentration detection device, 10... Adsorption type gas dryer. Note that the same reference numerals in the figures indicate the same or corresponding parts. 1st
Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. Ozonated oxygen from an ozone generator is sent to a liquid or solid phase object containing organic matter to cause a reaction, and impurities are removed from the exhausted oxygen using an adsorption gas dryer. In the oxygen recycling type ozone generator, which is used again as raw material oxygen for the ozone generator, a detection device for detecting the combustible gas concentration of the recycled gas is installed in the recycling system between the adsorption type gas dryer and the ozone generator. 1. An oxygen recycling type ozone generator, characterized in that the detection device automatically stops the operation of the ozone generator when the concentration of combustible gas exceeds a certain value. 2. The oxygen recycling type ozone generator according to claim 1, comprising a combustible gas concentration detection device using a gas detection means for catalytically burning gas with a platinum wire. 3. The oxygen recycling type ozone generator according to claim 1, comprising a combustible gas concentration detection device using a semiconductor gas sensor. 4. The oxygen recycling type ozone generator according to claim 1, comprising a combustible gas concentration detection device using a flame ion detection method.