JPS606282B2 - Oxygen recycling ozone generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oxygen recycling ozone generator, and more particularly to a safety mechanism in case the operation of the apparatus is temporarily stopped.

Ozone generators that use air as a raw material are widely used, but when oxygen is used as a raw material, the ozone generation efficiency is approximately twice that of when air is used as a raw material, and significant energy savings can be achieved.

However, even if oxygen is used as a raw material, only a few percent is converted to ozone.
"Most of the oxygen will be exhausted as is. Therefore, the amount of oxygen consumed will increase, and the cost of ozone generation will be significantly higher compared to ozone generators that use air as the raw material. However, it will not be converted to ozone. The cost of ozone generation can be considerably reduced by using an oxygen recycling ozone generator that separates oxygen from ozone and returns it to the ozone generator. Figure 1 is a system diagram showing the configuration of a conventional oxygen recycling ozone generator. , shows a configuration with two adsorption towers that can be alternately converted into an adsorption process and a desorption process by operating a solenoid valve.

In the figure, 1 is an ozone generator, 2 is a cooler, 3-1, 3
-2, 3-3, 3-4, 3-5, 3-6, 3-7, 3-8 are solenoid valves for operation switching, 4--, 4-2 are ozone adsorption towers, 5-1, 5-1 2 is an adsorbent (silica gel), and 6 is a blower. In the conventional oxygen recycling ozone generator configured as shown in the figure, the adsorption tower 4-1 performs the adsorption process,
When the adsorption tower 4-2 is in the desorption process, the solenoid valves 3-1,
3-2 is open, and solenoid valves 3-3, 3-4 are closed.

While the raw material oxygen supplied to the ozone generator 1 passes through the ozone generator 1, a part of the raw material oxygen becomes ozone due to electric discharge, and is sent to the cooler 2 as ozonized oxygen (02-03). The ozonized oxygen cooled by the cooler passes through the solenoid valve 31I and cools the adsorbent in the adsorption tower 4-Kawakoiri tower, and the cooled adsorbent 5-K' which has become low temperature.
Even after the ozone is adsorbed, the remaining oxygen is sent to the blower 6 through the solenoid valves 3 and 2. The oxygen sent to the ozone generator is recycled by the blower 6. The oxygen consumed by ozonization at this point is replenished from the raw material oxygen supply port. In the desorption system, solenoid valves 3-59 and 8-8 are open, and solenoid valves 3-79 and 8-8 are closed, and the dry gas is transferred to the adsorption tower Kameyama milk adsorbent 5-2 through solenoid valve 8...
The gas passes through the solenoid valve S-8 and is sent to the point of use as an ozone-containing gas while removing the ozone that has been adsorbed by the gas.

When the adsorbent 5 in the adsorption tower 4-2 adsorbs ozone to near saturation, the adsorption tower 4-2 switches from the ozone adsorption process to the ozone desorption process by operating a solenoid valve. Each is switched to the adsorption process.

In the conventional oxygen recycling ozone generator, as mentioned above, the adsorbent (silica gel) in the adsorption tower is cooled by the air carried by the gas from the cooler 2, so when the operation of the equipment is stopped, The temperature of the adsorbent (silica gel) in the adsorption tower increases.

The ozone adsorbed by the adsorbent is released, and the ozone concentration in the tether increases as well as the pressure in the tether, creating the risk of an explosion due to an ozone chain reaction. For example, ozone-containing oxygen with a gas phase ozone concentration of 3% to a total pressure of 2 atm is -60q0
If the concentration of silica gel adsorbed in the device rises from -6000 to 0°C while the device is closed during a temporary stop of operation, the total pressure will rise to about 6.2 atmospheres and the ozone concentration will rise to about 18%. Predictable. It is said that the limit at which an ozone-containing gas becomes explosive at room temperature of 1 atm is usually about 20% ozone concentration, and the above situation is extremely dangerous. The following measures can be considered to avoid the risk of explosion as described above.

■ Before temporarily stopping the operation of the equipment, remove ozone to a safe limit.

(Prevent the temperature of the B' adsorption tower from rising.

{C) Take measures to prevent the gas phase ozone concentration from increasing. Among the above, wind has the drawback that it takes an extremely long time to reach steady operation when restarting the device, and there is no simple implementation method for t{Bi. The object of the present invention is to obtain an oxygen recycling ozone generator which does not pose the danger of explosion even when the operation of the apparatus is temporarily stopped by providing means for implementation. FIG. 2 is a system diagram showing the construction of an embodiment of the oxygen recycling ozone generator according to the present invention. In the figure, there is a space in the lower part of the adsorption tower where no adsorbent exists (referred to as the void area in this specification). The solenoid valves of Flea-8 and Crab-4 are also Funama ozone decomposition towers. The oxygen recycling ozone generator configured as described above does not operate with a solenoid valve during normal operation. Noboru-Duke-89 8-4 It was stolen and closed and "operates in the same way as the conventional one.

When the operation of the device is temporarily stopped, the solenoid valve 3 is used? 8
- Public 3 mountains 363 - thing 8 8-6 army 8 one flea 9 3-7?
3-Even if Liao is closed, the flow of adsorbed gas is stopped, and the ozone generator is also stopped, and at the same time, the solenoid valve Todoroki is closed?
Kaniichi 27 H-3, Flea-Tsuru are opened. The dry air passes through the flow control valve 8 solenoid valve 9, the flea 3, and the adsorption tower tortoise.
Mushroom a8 4-2a There is no silica gel at the bottom, passing through the space's flow path ~ diluting the ozone concentration of the highly concentrated ozone-containing gas that is desorbed as the temperature of the silica gel rises. The ozone contained in the dry air that flows into the ozone decomposition tower is decomposed and emitted. The ozone-containing gas is easily diluted to safe limits and the risk of explosion due to ozone chain reaction that occurs in conventional devices is eliminated.

In this case as well, the gas flow rate to be supplied to the adsorption tower may be extremely small. For example, ``The temperature rise from -600C to 0℃ is 3
If it were to be carried out over a period of time, a dry air flow of about 160N would be required for 10 adsorption towers in order to always maintain a gas phase ozone concentration of 10% or less. This is an extremely small value, equivalent to about 2% of the adsorbed gas flow rate of about 700 sails during continuous operation.In addition, in the above embodiment, the gas for safety when the chopper operation is temporarily stopped is supplied from a dry air source. However, the same effect as in the above embodiment can be achieved by storing dry air in advance at high pressure in a separate tank and flowing an appropriate minute flow rate when the operation is temporarily stopped.

Furthermore, ``There is no significant difference in effectiveness no matter where in the adsorption tower the space where no adsorbent exists is provided, or whether a plurality of spaces are provided.

Furthermore, the size of the volume of the space does not make much of a difference to the effect. Therefore, in the extreme case, the volume of the space where no adsorbent is present may be zero. In this case, it is desirable that the dry air flow path in the adsorbent be short. FIG. 3 is a system diagram showing the configuration of an embodiment in this case. As explained above, this invention allows gas to flow through the silica gel adsorbent without penetrating the silica gel adsorbent when the operation of the oxygen recycling ozone generator is temporarily stopped, and the high concentration ozone-containing oxygen that is desorbed from the silica gel when the temperature rises is reduced to a safe limit. The addition of a simple device that dilutes and discharges the fuel will improve safety and shorten the time it takes to reach steady state operation upon restart, and has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of a conventional oxygen recycling ozone generator, FIG. 2 is a system diagram showing the configuration of an embodiment of the oxygen recycling ozone generator according to the present invention, and FIG. 3 is a system diagram showing the configuration of an embodiment of the oxygen recycling ozone generator according to the present invention. FIG. 2 is a system diagram showing the configuration of another embodiment of the oxygen recycling ozone generator. In the diagram, Kawama ozone generator, 2 is a cooler, and 3 is a stove? 3
12? 3-3? 3-493-5; 3 Misaki 6, 3-7, rob-
Tsubasa'ma solenoid valve, 4-1$ Umbrella-294-Koto 4-2
a is the adsorption tower, 5-tortoise, 5-2 is the adsorbent, the blower is taken away, the flow rate adjustment valve is controlled by the fin-tortoise 9, 8-2, 8-3 is the solenoid valve controlled by the fin-turtle, 9 is the ozone decomposition valve. It is a tower.The same reference numerals in each figure indicate the same or corresponding parts.Figure 1Figure 2Figure 3

Claims (1)

[Claims] 1. In an oxygen recycling ozone generator having an ozone adsorption tower in which an ozone adsorption step and an ozone desorption step are alternately repeated, a dry gas supply path provided between a dry gas supply source and the adsorption tower, and the ozone adsorption tower an air supply valve that is inserted into the dry gas supply path and is opened when the adsorption tower stops operating, and supplies the dry gas to the air gap in the adsorption tower; A device, a gas discharge path provided between the end of the gap portion and the outside of the adsorption tower, and an exhaust valve device inserted into the gas discharge path and opened and closed in conjunction with the air supply valve device. An oxygen recycling ozone generator featuring: