JPS608962B2 - Oxygen recycling ozone generator - Google Patents

Description

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

The secondary oxygen recycling ozone generator will be explained with reference to FIG.

1 is an ozonizer, 2 is an ozone reaction tank, 3 is a gas circulation blower, 4 is a condenser, 5 is a gas cooler, 6 is a gas dryer, 6
01,602 is an adsorption tower, 603-6101 is a valve, 6
11 is a dehumidifier, 612 is a proa, and 613 is a gas heater.

In such a configuration, ozonized oxygen, part of which is converted into ozone by the ozonizer 1, is sent to the ozone reaction tank 2.
Ozone is consumed in the ozone reaction tank 2, and oxygen is discharged.

The ozone reaction tank 2 contains a liquid ozone consuming substance, and when ozonated oxygen is blown into the liquid, the ozone is consumed and the oxygen is discharged. For example, if ozone is to be used to bleach pulp, it is blown into an aqueous solution in which the pulp is suspended. Furthermore, when ozone is used as a chemical material for organic substances, ozonized oxygen is blown into the organic solution. Therefore, the exhausted oxygen contains moisture and organic matter. Oxygen discharged from the ozone reaction tank 2 is pressurized by a blower 3, passes through a condenser 4, a cooler 5, and a gas dryer 6 to become dry oxygen, which is returned to the ozonizer 1 and used as raw oxygen. The consumed oxygen that is converted to ozone is supplied as supplementary oxygen. The condenser 4 cools the oxygen containing moisture and organic matter with cooling water and removes the moisture and organic matter as a drain, and the cooler 5 cools the oxygen with a low temperature prine cooled by a refrigerator (not shown). The moisture and organic matter that could not be removed by the condenser 4 are then removed as a drain. The gas dryer 6 uses an adsorbent to further remove moisture and organic substances from oxygen to achieve the conditions required for raw oxygen for an ozonizer, such as a dew point of -5000 or lower as the degree of dryness of oxygen. The gas dryer 6 includes a pair of adsorption towers 601 and 602 filled with adsorbent and a valve 603 that switches the flow of gas.
~610 and dehumidifier 611 for regenerating adsorbent, Proa 61
2, a gas heater 613. When the adsorption tower 601 is currently in the gas drying process, oxygen sent from the cooler 5 passes through a valve 603, where moisture is removed by an adsorbent in the adsorption tower 601, and is sent through a valve 605 to the ozonizer river. At this time, the adsorption tower 602 is in the process of regenerating the adsorbent, and the oxygen circulated by the blower 612 is heated by the gas heater 613, enters the adsorption tower 602 through the valve 610, and removes the moisture adsorbed by the adsorbent. Dehumidifier 611 through valve 608
sent to. In the dehumidifier 611, the adsorbent 602 is
It cools and dehumidifies the moisture in the oxygen that is sent to it. The operations of adsorption tower 601 and adsorption tower 602 are switched at regular intervals. In this way, the ozonized oxygen discharged from the ozonizer 1 is used as ozone in the ozone reaction tank 2, and the oxygen is dried and used again as raw material gas, thereby establishing an oxygen recycling system.

FIG. 2 shows another embodiment of the following oxygen recycling ozone generator.

1 to 5 are the same as in FIG. 1, and 7 is a humidity exchanger.

The gas dryer 6 in FIG. 1 is replaced with a humidity exchanger 7. The humidity exchanger 7 includes a pair of adsorption towers 701 and 702 filled with adsorbent and valves 703 to TI that switch the flow of gas.
Consists of O. If the adsorption tower 701 is currently in the gas drying process,
Oxygen sent from cooler 5 passes through valve 7.04, moisture is removed by an adsorbent in adsorption tower 701, and is sent to ozonizer 1 through valve 706. This drying process is similar to that of the gas dryer 6 shown in FIG. At this time, the adsorption tower 702 is in the process of regenerating the adsorbent, and the regeneration is carried out by sending dry ozonized oxygen from the ozonizer to the adsorption tower 702 through the valve 709. That is, dry ozonized oxygen is transferred to the adsorption tower 702.
The water adsorbed on the adsorbent inside the tank is desorbed and becomes L-humidified ozonized oxygen, which is sent to the ozone reaction tank 2 through a valve 707. The operations of adsorption towers 701 and 702 are switched at regular intervals. The adsorbent used is one that does not decompose ozone. The other operations of the reloading are the same as in the case of FIG. 1, and the same functions as in the case of FIG. 1 are performed, and an oxygen recycling system is established. The disadvantage of the conventional oxygen recycling ozone generator shown in Figs. 1 and 2 is that organic substances contained in the oxygen discharged from the ozone reaction tank 2 are not completely removed by the condenser 4 and cooler 5, and are adsorbed. Tower 601, 602, or 701
, 702, or have an adverse effect on the ozonizer.

In other words, some ozone remains in the oxygen that has left the reaction tank 2, so the organic matter and ozone react on the surface of the adsorbent, producing high-molecular organic matter, which reduces the adsorption capacity of the adsorbent, or The organic matter that has entered the discharge space of the ozonizer 1 becomes a polymeric organic matter in the discharge space and adheres to the electrode surface, reducing the ozone generation efficiency. Therefore, it was necessary to replace the adsorbent and clean the ozonizer 1 at regular intervals. This invention was made to eliminate the drawbacks of the above-mentioned conventional methods, and by decomposing organic matter entering the adsorption tower into carbon dioxide and water in front of the adsorption tower, it is possible to replace the adsorbent or use the ozonizer. The purpose is to provide an oxygen recycling ozone generator that can operate stably for a long period of time without cleaning.

Hereinafter, a description will be given of FIG. 3 in which the present invention is applied to the conventional embodiment shown in FIG. 2 above, but the same can be applied to the conventional embodiment shown in FIG.

Figure 3 shows an embodiment of the present invention, in which the object in the reaction tank 2 is in the form of an aqueous solution, and the oxygen coming out of the reaction tank mainly contains water, with a small amount of volatile organic matter. This applies when the

In FIG. 3, 1 to 7 are the same as in FIG. 2, and 8 is a gas reactor.

In the gas reactor 8, organic substances in the oxygen discharged from the ozone reaction tank 2 react with ozone and are decomposed into carbon dioxide and water. Necessary ozone is supplied by bypassing a part of the ozone sent to the ozone reaction tank 2. Furthermore, since ozone is not completely consumed in the ozone reaction tank 2 and is contained in the exhausted oxygen, there is no need to newly supply ozone if that ozone alone is sufficient. Specific examples of the gas reactor 8 are shown in FIGS. 4 and 5.

Figure 4 shows a heating type gas reactor, 81 is a gas inlet pipe, 8
2 is a gas outlet pipe, 83 is an ozone injection pipe, 84 is a heat exchanger, and 85 is a heating coil. Oxygen, water vapor, and organic substances entering from the gas inlet pipe 81 are mixed with ozonized oxygen sent from the ozone injection pipe 83, preheated by a heat exchanger 84, and further heated by a heating coil to reach the temperature required for the reaction. The organic matter is decomposed into carbon dioxide gas and water, cooled again by the heat exchanger 84, and discharged. The temperature required for the reaction depends on the type of organic substance, but a relatively low temperature of about 300 ℃ is sufficient. Figure 5 shows a photoreaction type gas reactor, 81-8
3 is the same as in Fig. 4, 86 is an ultraviolet lamp,
87 is a reflecting plate.

When a mixture of oxygen, water vapor, organic matter, and ozone is irradiated with ultraviolet rays, ozone is excited by the ultraviolet rays and its reaction rate with organic substances becomes extremely high.The ultraviolet rays also generate OH radicals from ozone and water vapor, which oxidize and decompose organic substances. By doing so, the decomposition of organic matter by ozone is carried out quickly. The reflector plate 87 effectively utilizes the ultraviolet light emitted from the ultraviolet lamp 86. As explained above, the third
In the oxygen recycling system shown in the figure, the organic matter discharged from the reaction tank 2 is decomposed into carbon dioxide and water in the gas reactor 8, so that the organic matter does not reach the humidity exchanger 7 or the ozonizer 1, as shown in Figures 1 and 2. The drawbacks mentioned in the conventional example are eliminated. Note that carbon dioxide gas does not have a negative effect on the humidity exchanger 7 or the ozonizer 1. FIG. 6 shows another embodiment of the invention. Reaction tank 2
This is a case where the target substance in the reaction tank 2 is a solution of an organic solvent, and the oxygen coming out of the reaction tank 2 contains a large amount of volatile organic matter in addition to water. In FIG. 6, 1 to 8 are the same as those in FIG. 5, and 9 is a gas cooler similar to the gas cooler 5.

Oxygen containing organic matter discharged from the reaction tank 2 is cooled in a gas cooler 9 by cold brine sent from a refrigerator (not shown), most of the organic matter is condensed, and returned to the reaction tank 2 as drain. . The residual organic matter not removed by the cooler 9 is decomposed into carbon dioxide and water in the gas reactor 8 as explained in the case of FIG. As described above, according to this invention, the oxygen recycling system is configured to decompose the organic matter contained in oxygen and released from the reaction tank into carbon dioxide gas and water, so it can be used for a long time without replacing the adsorbent or cleaning the ozonizer. It has the effect of being able to operate stably for a long period of time and improving its operating rate.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams showing a subordinate oxygen recycling ozone generator, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIGS. 4 and 5 are respectively shown in FIG. FIG. 6 is a structural diagram showing details of a gas reactor according to the present invention, and FIG. 6 is a structural diagram showing another embodiment of the present invention. In the figure, 1 is an ozonizer, 2 is an ozone reaction tank, 3 is a gas circulation prower, 4 is a condenser, 5 is a gas cooler, 7 is a humidity exchanger, and 8 is a gas reactor. Note that the same reference numerals in the figures indicate the same or corresponding parts. Convict *2 Figure *3 Figure *4 Figure 5 Meat 6 figure

Claims (1)

[Claims] 1. Oxygen recycling ozone in which ozonized oxygen from an ozonizer is introduced into an ozone reaction tank, and oxygen discharged from the ozone reaction tank after consuming ozone is circulated to the ozonizer and used again as raw material oxygen. An oxygen recycling ozone generator characterized in that a gas reactor is provided on the outlet side of the ozone reaction tank to decompose organic matter contained in oxygen discharged from the ozone reaction tank into carbon dioxide gas and water. . 2. The oxygen recycling ozone generator according to claim 1, wherein the gas reactor decomposes the organic matter by heating in the coexistence of the organic matter and ozone. 3. The oxygen recycling ozone generator according to claim 1, wherein the gas reactor decomposes the organic matter by UV irradiation in the coexistence of the organic matter and ozone.