JPS5813483B2 - 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.

FIG. 1 shows a schematic configuration of a conventional oxygen recycling ozone generator.

In Figure 1, 1 is an ozone generator, 2 is a heat exchanger, and 3 is an ozone generator.
is a refrigerator, 4-1 to 4-8 are solenoid valves for operation switching, and 5-
1.5-2 is an ozone adsorption tower, 6 is a raw material oxygen supply device, 7
8 is a dry gas inlet for desorption, and 8 is an ozone-containing gas outlet.

In the figure, the oxygen recycle system road is shown as actually closed, and the dry gas system road is shown as a broken line.

In the following, a state in which the adsorption tower 5-1 performs an ozone adsorption operation and the ozone adsorption tower 5-2 performs an ozone desorption operation in the conventional oxygen recycling ozone generator shown in FIG. 1 will be described.

While the raw material oxygen supplied to the ozone generator 1 passes through the ozone generator 1, part of it becomes ozone due to electric discharge, and is sent to the heat exchanger 2 as ozone-containing oxygen (hereinafter referred to as ozonized oxygen) and frozen. It is cooled by the refrigerant from machine 3.

The cooled ozonized oxygen enters the ozone adsorption tower 5-1 via the solenoid valve 4-1, cools the adsorbent in the tower, and causes the cooled adsorbent to adsorb ozone, and the remaining oxygen passes through the solenoid valve 4-1.
-2 to be recycled to the ozone generator 1.

Here, the oxygen consumed as ozone is supplemented from the raw material oxygen supply device 6.

On the other hand, in the dry gas system (desorption system), the adsorption tower 5-
During the adsorption operation in step 1, the solenoid valves 4-7, 4-8 are open, and the solenoid valves 4-5, 4-6 are closed, and dry gas flows from the inlet 7 through the solenoid valve 4-7 to the ozone adsorption tower 5. -2, and while desorbing the ozone adsorbed in the adsorption tower 5-1 in the previous stage, it is sent as an ozone-containing gas through the solenoid valve 4-8 to the point of use from the outlet 8.

When the adsorbent in adsorption tower 5-1 adsorbs ozone to near saturation, the solenoid valve is operated so that ozone adsorption tower 5-1 changes from ozone adsorption operation to ozone desorption operation, and adsorption tower 5-2 changes from ozone desorption operation to ozone adsorption operation. can be switched to

By alternately repeating the ozone adsorption and desorption operations described above, ozone is continuously produced and supplied.

By the way, when the above-mentioned conventional oxygen recycling ozone generator is stopped, the temperature of the adsorbent in the ozone adsorption tower rises, so the ozone adsorbed by the adsorbent is desorbed, and as the pressure inside the tower increases, ozone is released. At high concentrations, there is a risk of explosion due to chain decomposition reactions of ozone.

Therefore, in order to prevent an explosion, it is necessary to discharge the adsorbed ozone out of the system.

Therefore, when restarting the device, a preparation period is required for accumulating ozone in the adsorbent, and there is a drawback that it takes a long time to start steady operation.

This invention was made in view of the above-mentioned drawbacks of the conventional ones. By adding a heat storage function to the ozone adsorption tower, it is possible to safely keep ozone adsorbed on the adsorbent for a long time. The present invention provides a recycled ozone generator.

An embodiment of the present invention shown in FIG. 2 will be described below.

In FIG. 2, 1 to 4 and 6 to 8 are the same as the conventional one.

5'-1.5'-2 is an ozone adsorption tower equipped with a heat storage function,
9 is a heat storage body 0 In the operation of the oxygen recycling ozone generator according to the present invention, the separation of ozone and oxygen by adsorption and desorption of ozone and the recycling of the separated oxygen to the ozone generator 1 are the same as conventional ones. .

However, the ozonized oxygen cooled by the heat exchanger 2 passes through the electromagnetic valve 4-1 and enters the adsorption tower 5'-1, cooling not only the adsorbent in the tower but also the heat storage body 9, thereby storing cold heat.

When stopping the oxygen recycling ozone generator, close all solenoid valves of the ozone adsorption tower 5'-1.5'-2 while adsorbing ozone.
As mentioned above, since the heat storage body 9 is provided in the ozone adsorption tower 5'-1.5'-2 and cold heat is stored in the heat storage body 9 during normal operation, the ozone adsorption tower 5'-1 .5'-
2 is kept cold for a long time.

Therefore, the risk of explosion due to ozone desorbed as the temperature of the adsorbent increases, which is seen in conventional oxygen recycling ozone generators, can be prevented without discharging the adsorbed ozone out of the system.

For the above reasons, when the oxygen recycling ozone generator is restarted, it is possible to enter the normal operating state without requiring a preparation period for accumulating ozone in the adsorbent.

Furthermore, even if the equipment stops due to a sudden accident or failure, the adsorbent is kept cool, which prevents the risk of explosion due to ozone.

In addition, instead of simply using the sensible heat amount as the heat storage material, it is also possible to use a heat storage material that undergoes a phase change at a temperature slightly higher than the operating temperature of the adsorbent.

FIG. 3 is a partially cut away vertical cross-sectional view showing an example of an ozone adsorption tower using such a heat storage material. In the figure, 10 is an adsorbent using, for example, silica gel, and 11 is a heat insulating container.

For example, when the adsorbent 10 is operated at -60°C, if a 60-65% ethylene glycol aqueous solution with a melting temperature of about -55°C is used as the heat storage body 9, the amount of latent heat of the heat storage body 9 can also be utilized. , reducing the volume of the heat storage body 9;
A compact ozone adsorption tower can be realized, and the adsorbent 1
The temperature of 0 can also be kept constant.

As described in detail above, the present invention includes an ozone generator, an ozone adsorption tower having an adsorbent for bringing ozone of the ozonized oxygen obtained from the ozone generator into contact with dry gas, and an ozone adsorption tower that has an ozone adsorbed In a device consisting of an oxygen recycling system that recycles ozone to an ozone generator, the ozone adsorption tower is equipped with a heat storage device, so ozone can be safely maintained for a long time while adsorbed on the adsorbent of the ozone adsorption tower. , the preparation period for restarting the device after it is temporarily stopped can be reduced or eliminated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional oxygen recycling ozone generator, Fig. 2 is a block diagram of an embodiment of the oxygen recycling ozone generator according to the present invention, and Fig. 3 is an example of an ozone adsorption tower used in the present invention. FIG. In the figure, 1. 2 is an ozone generator, 2 is a heat exchanger, 3 is a refrigerator, 4-1 to 4-8 are operation switching solenoid valves, 5-1.
5-2.5'-1.5'-2 is an ozone adsorption tower, 6 is a raw material oxygen supply device, 7 is a dry gas inlet, 8 is a treated ozone-containing gas outlet, 9 is a heat storage body, 10 is an adsorbent , 11 is a heat insulating container. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An ozone generator that generates ozone using oxygen as a raw material;
an ozone adsorption tower having an adsorbent for adsorbing ozone in the cooled ozone-containing oxygen obtained from the ozone generator; a dry air system line for sending ozone desorption dry gas to the ozone adsorption tower to extract ozone; An oxygen recycling ozone generator having an oxygen recycling system for recycling the oxygen separated in the ozone adsorption tower to the ozone generator, characterized in that it is equipped with a heat storage device that suppresses temperature changes in the ozone adsorption tower. . 2. The oxygen recycling ozone generator according to claim 1, wherein the heat storage device uses a heat storage material that undergoes a phase change at a temperature slightly higher than the operating temperature of the adsorption tower. 3. The oxygen recycling ozone generator according to claim 1 or 2, characterized in that the heat storage device uses an ethylene glycol aqueous solution as a heat storage material.