JPS6111883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent ozone supply device.

Ozone has a strong oxidizing power and is non-polluting, so it has come to be widely applied in the fields of environmental treatment, chemical industry, etc. When using such ozone, there are two methods: continuous use and intermittent use, depending on the purpose. Intermittent use of ozone is a method that can prevent organisms such as algae and shellfish from adhering to the cooling water pipes of power plants, chemical factories, and machine factory equipment, reducing their function by reducing heat exchange efficiency and clogging the pipes. Intermittently (1 to 1 It is used to suppress the reproduction of the above organisms by injecting ozone once to several times every few days for one minute. When using ozone intermittently in this way, if the ozone generator is also operated intermittently, a large ozone generator with high equipment costs is required, so generally a small ozone generator is used. An intermittent ozone supply device is used that stores the generated ozone in low-temperature silica gel for a long period of time (1 to several days), then desorbs the ozone all at once in a few minutes when necessary and injects it into the water to be treated. It is being said.

FIG. 1a is a system diagram showing a conventional intermittent ozone supply device, and FIG. 1b is a vertical sectional view showing its adsorption/desorption tower. 3 is a circulation blower that circulates oxygen from this adsorption/desorption tower to the ozone generator 1; 4 is an oxygen supply source to the ozone generator 1; 5a to 5d are electromagnetic valves; 6 is the adsorption/desorption tower 2;
7 is a heater installed in this hot brine tank; 8 is a pump that sends the warm brine to the adsorption/desorption tower 2; 9 is a refrigerator that cools the adsorption/desorption tower 2; 10 is an adsorption/desorption tower; This is a water ejector that sucks ozone from the desorption tower 2. Also, Figure 1b
2a is an ozone adsorbent filled in the adsorption/desorption tower 2, and silica gel is usually used. 2b is an inner cylinder that accommodates this ozone adsorbent;
2d is an adsorption/desorption brine tank provided between the inner and outer cylinders, and 2e is an evaporation pipe that is in close contact with the inner cylinder 2b and connected to the refrigerator 9.

Next, the operation of the above device will be explained with reference to the operation sequence shown in FIG. This operation is divided into an ozone adsorption operation and an ozone desorption operation, and the arrows represent the operating time of the device, and in the case of a solenoid valve, indicate the open state.

First, to explain the ozone adsorption operation, the ozone generator 1, adsorption/desorption tower 2, and circulation blower 3 constitute an oxygen circulation system in this order, and the solenoid valve 5a,
5b is open, and solenoid valves 5c and 5d are closed. Oxygen is supplied from the oxygen supply source 4 so that the system pressure is constant (usually 2ata), and the ozonized oxygen generated by the ozone generator 1 is introduced into the adsorption/desorption tower 2, where only ozone is It is adsorbed by the ozone adsorbent 2a. A so-called oxygen recycling system is constructed in which the oxygen (95% or more) that has not been ozonized by the ozone generator 1 is returned to the ozone generator 1 by a circulation blower 3 and used for circulation. Since the ozone adsorbed by the adsorption/desorption tower 2 increases as the temperature of the silica gel decreases, the ozone is cooled to -30° C. or higher by the refrigerator 9 during the ozone adsorption period. Normally, this cooling is performed by evaporating freon compressed by the refrigerator 9 in the evaporator tube 2e that is in close contact with the inner cylinder 2b.

In this way, ozone is adsorbed in the adsorption/desorption tower 2, but when the ozone adsorbent 2a approaches ozone adsorption saturation after a desired period of time, ozone leaks from the gas outlet of the adsorption/desorption tower 2. come. If this leak starts and the suction operation continues, the device will lose power, so the suction operation is ended and the desorption operation is started. Note that this adsorption time is set in advance.

Next, the ozone desorption operation will be explained. When the ozone desorption operation begins, the solenoid valves 5a and 5b close.
The solenoid valves 5c and 5d open, water flows into the water ejector 10, and the ozone in the adsorption/desorption tower 2 is sucked under reduced pressure and dissolved in water to produce ozone water. At the same time, the pump 8 operates, and the brine in the warm brine tank 6, whose temperature has been raised in advance by the heater 7 (usually 50°C), flows into the adsorption/desorption brine tank 2d, which adsorbs ozone that had been cooled to a low temperature during the adsorption operation. The temperature of the agent 2a is increased to promote ozone desorption.

The ozone adsorption operation takes a long time (1 to several days), but the ozone desorption takes place in the adsorption/desorption tower 2 as described above.
This can be done in a short time (several minutes) by increasing the temperature and reducing the pressure.
After the desorption is completed, the adsorption operation starts again, the circulation system is filled with oxygen from the oxygen supply source 4, the adsorption/desorption tower 2 is cooled again by the refrigerator 9, and the ozone adsorption operation begins.

In such an intermittent ozone supply device, water may flow backwards and enter the adsorption/desorption tower 2. If water flows back into the adsorption/desorption tower 2 and enters, the silica gel adsorbs a large amount of ozone and oxygen, so it will be decomposed (ozone) or desorbed all at once, and there is a risk of an explosion. Even if it does not explode, silica gel containing water no longer has the ability to adsorb ozone, so it is necessary to replace the silica gel. Therefore, in such an intermittent ozone supply system, it is required that water never flow back into the adsorption/desorption tower.

By the way, when ozone is injected into the water pipe system using the apparatus shown in FIG. 1, there are cases where the water pressure in the water pipe system is always higher than the pressure inside the adsorption/desorption tower 2 (even during the ozone adsorption operation). In this case,
For example, if a foreign object gets into the valve body of the solenoid valve 5c,
Water flows back even when the device is closed, and conditions exist for water to flow back, especially during the ozone adsorption period, which takes up the majority of the device's operation. Water may enter.

The present invention was made as a safety measure against such a case, and two solenoid valves are installed in the desorption ozone flow path between the adsorption and desorption tower and the suction section to prevent the flow from flowing in the opposite direction. The purpose of the present invention is to provide an intermittent ozone supply device that can eliminate the risk of backflow of water by providing a valve in the flow path communicating between the two and allowing the fluid to flow out except during the ozone desorption period. There is.

FIG. 3 is a partial system diagram showing an intermittent ozone supply device according to an embodiment of the present invention, and in the figure, numerals 2 and 10 indicate the same or equivalent parts as in FIG. 1.
Reference numerals 5c1 and 5c2 refer to two electromagnetic valves 5c in FIG. 1, which are directly disposed in opposing flow directions in the desorption/desorption ozone flow path so as to prevent the flow in the opposite directions. , 5e is a solenoid valve provided in a flow path communicating from the middle of these solenoid valves to the open end, and is provided in a direction to prevent flow in the direction of the solenoid valves 5c1 and 5c2. The other structure of the intermittent ozone supply device is the same as that shown in FIG.

FIG. 4 shows the operating sequence of the apparatus of FIG. 3, which differs from the sequence of FIG. 2 in that the solenoid valve 5e is in an open state except during the ozone desorption period.

In the intermittent ozone supply device configured as described above, the solenoid valves 5c1 and 5 are used during the ozone desorption period.
Since c2 is open and 5e is closed, solenoid valve 5
There is no suction of water from e, and the situation is opposite to the above except during the ozone desorption period, so water ejector 10
Even if the solenoid valve 5c2 leaks as the pressure increases, the leaked water will be discharged out of the system and will not flow into the adsorption/desorption tower 2 because the solenoid valve 5e is open.

Furthermore, in conventional devices, a so-called non-leak solenoid valve that completely shuts off gas or liquid is normally used as the solenoid valve 5c2, and this solenoid valve is expensive and has a short lifespan. Since some electromagnetic valves may leak, a general-purpose one can be used, which has the advantage that the device can be manufactured at a correspondingly low cost.

Even if a check valve is used in place of the electromagnetic valve 5e, its function is the same. FIG. 5 is a partial system diagram showing an embodiment using a check valve, and in the figure,
11 is a check valve. The check valve 11 is a solenoid valve 5c
The direction from the middle of 1 and 5c2 to the outside of the system (open end) is a flow path through which water leaked from the solenoid valve 5c2 is drained, and the opposite direction is a direction to block the flow, and during the ozone desorption period, the water is kept in the atmosphere. The solenoid valve 5e in FIG. 3 operates in the same way as the solenoid valve 5e shown in FIG.

In the above description, the valves are not limited to the solenoid valve 5e and the check valve 11, but other valves having similar functions can be used. Furthermore, the format and structure of the ozone generator 1, adsorption/desorption tower 2, etc. are not limited.

Further, the intermittent ozone supply device of the present invention is not limited to the above-mentioned applications, but can be applied to all kinds of applications.

As described above, according to the present invention, water leaking from the electromagnetic valve is discharged outside the system during periods other than the ozone desorption period, so that the water pressure of the water pipe system into which ozone is injected is adjusted to the oxygen pressure during the ozone adsorption period (of the equipment). Even when the pressure is higher than the internal system pressure), backflow of water can be prevented and the intermittent ozone supply device can be operated safely, which is very effective.

[Brief explanation of the drawing]

Fig. 1a is a system diagram showing a conventional intermittent ozone supply device, b is a vertical sectional view showing its ozone adsorption/desorption tower, Fig. 2 is a sequence diagram of Fig. 1, and Fig. 3 is an embodiment of the present invention. A partial system diagram showing an intermittent ozone supply device according to
FIG. 5 is a partial system diagram showing another embodiment of the present invention. In each figure, the same reference numerals indicate the same or corresponding parts, 1 is the ozone generator, 2 is the adsorption/desorption tower, 5c, 5
C1, 5c2, and 5e are electromagnetic valves, 6 is a hot brine tank, 9 is a refrigerator, and 11 is a check valve.

Claims (1)

[Scope of Claims] 1. An ozone generator that generates ozonized oxygen from raw material oxygen, an adsorption/desorption tower capable of adsorbing ozone from the ozonized oxygen and desorbing ozone, and an ozone generation device that generates ozone by the ozone adsorption/desorption tower. a system for returning adsorbed oxygen to the ozone generator; a means for cooling the adsorption/desorption tower during ozone adsorption; and a system for raising the temperature of the adsorption/desorption tower during ozone desorption compared to that during adsorption and suctioning under reduced pressure. an intermittent ozone supply device having means for desorbing ozone by means of two electromagnetic valves provided in the desorption/desorption ozone flow path between the adsorption/desorption tower and the suction section so as to prevent flow in opposite directions; , between these solenoid valves, one end is connected and the other end is open, and a passage is provided in this passage, which blocks the flow in the direction of the solenoid valve during the ozone desorption period, and prevents the flow in the direction of the solenoid valve during other periods. An intermittent ozone supply device characterized by comprising: a valve that allows flow in the opposite direction; 2. The intermittent ozone supply device according to claim 1, wherein the valve is a solenoid valve that is open except during the ozone desorption period. 3. The intermittent ozone supply device according to claim 1, wherein the valve is a check valve that prevents flow in the direction of the electromagnetic valve.