JPS5929522B2 - Oxygen recycling ozone generation method and device - Google Patents

Description

Detailed Description of the Invention This invention is a highly economical gas-liquid product that uses oxygen as a raw material to generate a certain amount of ozone with approximately half the power consumption compared to when air is used as a raw material. The present invention relates to a contact type oxygen recycling ozone generation method and an oxygen recycling ozone generation device.

Conventionally, there has been an oxygen recycling ozone generator that circulates and reuses oxygen, an example of which is shown in FIG. 1.

The configuration and operation of this device will be explained below using figures.

In the figure, 1 is an oxygen supply device that supplies oxygen as a raw material, 2 is a buffer tank that alleviates pressure changes in the oxygen recycling system, and 3 converts a part of the oxygen supplied from this buffer tank 2 into ozone. This is an ozone generator for

This ozone generator 3 has electrodes on both sides via a dielectric material such as glass or mica, and when an alternating high voltage is applied between the electrodes, a glow discharge called a silent discharge occurs between the electrodes. When a gas containing oxygen is flowed there, a part of the oxygen is converted into ozone, and when only oxygen is supplied, ozone-containing oxygen with a concentration of 3 to 4 wt% can be obtained.

Reference numeral 4 denotes a gas-liquid contact type reaction tank to which this ozone-containing oxygen is supplied. In this reaction tank 4, the ozone is consumed by the liquid supplied from the raw water tank 12 by the pump 13 and sent to the treated water tank 14.

5 is a recycle circulation blower that sucks and pumps unreacted oxygen from this reaction tank, and 6 is a refrigeration dryer that dehumidifies this unreacted oxygen. be done.

Reference numeral 7 denotes an adsorbent type purifier that further dehumidifies the oxygen dehumidified by this freeze dryer 6 to a dew point of -50°C or lower.The oxygen dehumidified by this purifier 7 is returned to the buffer tank 2 and reused. .

This purifier 7 is usually composed of adsorption towers 7A and 7B filled with two or more adsorbents, and one adsorption tower 7A of the purifiers γ dehumidifies the recycled oxygen, while the remaining oxygen is dehumidified. Adsorption tower 7B performs heating regeneration of the adsorbent filled inside, and by switching the four-way valve 10A and IOH, adsorption towers 7A and 7B are alternately used to dehumidify the oxygen in the recycling system and heat the filled adsorbent. It will be played repeatedly.

Reference numeral 11 indicates a regeneration blower that circulates gas, usually oxygen, for heating and regenerating the adsorbent in the purifier 7. Reference numeral 8 indicates a heater that heats the gas sent by the regeneration blower.
heated to 00°C.

This heated gas passes through the adsorption tower 7B of the purifier 1, which is being regenerated, to heat and regenerate the adsorbent inside.

9 is a cooler for cooling the high-temperature, high-humidity gas from which water has been released from the adsorbent, and 22 is a droon trap of this cooler 9.

20 is a drain separator that further separates moisture from the gas cooled by the cooler 9, and 21 is a drain tank that stores water drained from the drain separator 20.

The gas discharged from the drain separator 20 is again sucked into the regeneration blower to continue heating and regeneration of the adsorbent.

When the dehumidification of the adsorbent is completed, the heater 8 is turned off and gas circulation is continued to cool the adsorbent so that it can fully exert its adsorption action, completing the heating regeneration of the adsorbent. .

In the conventional oxygen recycling ozone generator configured in this way, the purifier 7 can remove moisture from the oxygen in the recycling system, but gases other than oxygen coming out of the reaction tank 4, such as CO2, N2, and volatile Among organic substances, only those with high solubility in water cannot be removed, and these gases gradually accumulate in the recycling system.

As a result, the yield of the ozone generator 3 (the amount of ozone produced for a given amount of electricity) gradually decreases, and the efficiency decreases.
The drawback was that there was a risk that volatile organics could explode within the oxygen recycling system.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to safely obtain ozone at a high yield.

An embodiment of the present invention will be described below with reference to FIG.

In the figures, the same reference numerals as in the conventional example indicate the same or corresponding parts.

γ is a purifier that removes water and other gases from the oxygen in the recycling system to highly purify it. It consists of two or more adsorption towers 27A and 27B.

28 is an adsorbent heating regeneration device that sucks and heats outside air and blows it into the adsorption tower 27B that is being regenerated in the upper injector 7; 29 is an adsorbent cooling device that blows dry air into the adsorption tower 27B;
First, open the valve 19A to blow hot air from the adsorbent heating regeneration device 28 to heat and regenerate the adsorbent, and then open the valve 19A.
, then open the valve 19B to shut down the adsorbent cooling device 2.
Blow dry cold air from 9 to cool the adsorbent, and then close the valve 1.
Close 9B.

A vacuum pump 15 discharges the air in the adsorption tower 27B after the purifier 7 has been regenerated through the filter 16. After opening the valve 17B to draw a vacuum, the valve 18B is opened to inject oxygen to the purifier T. The gas inside is replaced with oxygen.

In the oxygen recycling system configured in this way, the adsorbent filled in the adsorption towers 27A and 27B of the purifier 7 is constantly heated and regenerated with fresh heated air, and is further cooled and regenerated with fresh dry air. Since the purifier 7 is treated, there is almost no gas other than air (therefore, it is regenerated so that it can adsorb various gases again,
This air is completely replaced with oxygen.

An embodiment of the present invention has been described above, but if dry air is sucked into the adsorption chamber J7J$ regeneration device 28 and heated, the dehumidification effect will be further improved. Nitrogen or the like may be used in the device 29 instead of air.

As explained above, in this invention, to regenerate the adsorbent packed in the adsorption tower of the purifier that highly purifies the recycled oxygen, instead of using circulating gas, fresh air etc. are constantly supplied from the outside. The adsorbent is inhaled to regenerate the adsorbent, and then the gas in the purifier is replaced with oxygen, so the adsorption efficiency of the adsorbent for impure gas in the oxygen recycling system is quite high. Since there is little decrease in the purity of oxygen in the system, the ozone yield does not decrease and the risk of explosion is eliminated, which is extremely effective.

[Brief explanation of drawings]

Figure 1 shows -fl of a conventional oxygen recycling ozone generator.
FIG. 2 is a block diagram of an oxygen recycling ozone generator according to an embodiment of the present invention. In the figures, the same symbols indicate the same or corresponding parts, 1 is an oxygen supply device, 2 is an ozone generator, 3 is a reaction tank,
7 is a purifier, 28 is an adsorbent heating regeneration device, 29 is an adsorbent cooling device, and 15 is a vacuum pump.

Claims (1)

[Claims] 1. Using oxygen as a raw material, a part of this oxygen is converted into ozone in an ozone generator, the converted ozone is consumed in a gas-liquid contact type reaction tank, and the oxygen released from this reaction tank is In an ozone generation method in which ozone is highly purified in an adsorbent-type purifier and reused, a constantly fresh, high-temperature first gas is introduced into the purifier from the outside in order to regenerate the adsorbent in the purifier. An oxygen recycling ozone generation method characterized in that the gas in the purifier is replaced with oxygen after cooling by supplying a constantly fresh dry second gas taken in from the outside. 2. The oxygen recycling ozone generation method according to claim 1, wherein the first gas and the second gas are air. 3. An ozone generator that uses oxygen as a raw material and converts some of this oxygen into ozone, a gas-liquid contact type reaction tank that consumes the ozone generated by this ozone generator, and an ozone generator that uses oxygen released from this reaction tank. In an oxygen recycling ozone generator comprising an adsorbent-type purifier for high purity, an adsorbent heating regeneration device that heats and blows constantly fresh first gas taken in from the outside into the purifier. and an adsorbent cooling device that constantly blows fresh dry second gas taken into the purifier from the outside, and a displacement device that evacuates the gas in the purifier and then injects oxygen. An oxygen recycling ozone generator characterized by: 4. The oxygen recycling ozone generator according to claim 3, wherein the first gas and the second gas are air.