JPS6259044B2 - - Google Patents

Description

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

Since ozone has strong oxidizing power and is non-polluting, it has come to be widely applied in the environmental and chemical fields. When using this ozone, there are two methods: continuous use and intermittent use. One way to use ozone intermittently is to prevent microorganisms such as algae and shellfish from attaching to the cooling water pipes of power plants and chemical factories, reducing their functionality (decreasing the heat exchange rate and clogging the pipes). To prevent this, inject ozone intermittently (1 day or more)
It is used to suppress the growth of the above-mentioned microorganisms (once every few days for one minute). When ozone is used intermittently in this way, the ozone generator is also operated intermittently, so the ozone generator itself needs to be large and expensive, so generally small ozone generators are used to generate ozone. An intermittent ozone supply device is used that stores ozone in low-temperature silica gel for a long time (one to several days) and desorbs the ozone all at once in a few minutes.

FIG. 1 shows a conventional intermittent ozone supply device.
In the configuration diagram shown in Figure 1a, 1 is an ozone generator, 2 is an adsorption/desorption tower, 3 is a circulation blower, 4 is an oxygen supply source, 5-1 to 5-4 are electromagnetic valves, and 6 is a warm brine tank. , 7 is a heater, 8 is a warm brine pump,
9 is a refrigerator, and 10 is a water ejector. Also the first
In the structural diagram of the adsorption/desorption tower 2 shown in Figure b, 2-
1 is an ozone adsorbent, and silica gel is usually used. 2-2 is an inner cylinder, 2-3 is an outer cylinder, 2-4 is an adsorption/desorption brine tank, and 2-5 is an evaporation tube.

Next, the operation of the apparatus will be explained along with the operation sequence shown in FIG. This operation is divided into an ozone adsorption operation and an ozone desorption operation.

First, to explain the ozone adsorption operation, the ozone generator 1, the adsorption/desorption tower 2, and the circulation blower 3 constitute an oxygen circulation system in this order, and the solenoid valve 5-1,
5-2 is open, and solenoid valves 5-3 and 5-4 are closed. From the oxygen supply source 4, the system pressure is constant (usually
2ata), and the ozonized oxygen generated by the ozone generator 1 is sent to the adsorption/desorption tower 2.
where only ozone is adsorbed by the adsorbent. 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 lower by a refrigerator 9 during the ozone adsorption period. Normally, this cooling is performed by evaporating the fluorocarbon compressed by the refrigerator 1 through an evaporation tube 2-5 closely attached to the inner cylinder 2-2.

In this way, ozone is adsorbed in the adsorption/desorption tower, but when the adsorbent approaches ozone adsorption saturation after a predetermined period of time has elapsed, ozone leaks from the gas outlet of the adsorption/desorption tower 2. If the suction operation continues even after this leak has started, power loss will occur in the device, so the suction operation is ended here and the desorption operation is started. Note that this adsorption time is predetermined.

Next, the ozone adsorption operation will be explained. When the ozone adsorption operation starts, the solenoid valves 5-1 and 5-2 close, the solenoid valves 5-3 and 5-4 open, and the water ejector 1
Water flows through the adsorption/desorption tower 2, and the ozone in the adsorption/desorption tower 2 is sucked under reduced pressure and dissolved in water to produce ozonated water. At the same time, the pump 8 operates, and the heater 7 raises the temperature (normally
50° C.) in the warm brine tank 6 flows into the adsorption/desorption brine tank 2-4, which raises the temperature of the adsorbent that has been cooled to a low temperature during the adsorption operation, thereby promoting the desorption of ozone.

Although the ozone adsorption operation takes a long time (one to several days), the ozone desorption is performed in a short time (several minutes) by raising the temperature and reducing the pressure of the adsorption/desorption tower 2 as described above. 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.

Now, during ozone desorption, warm brine flows into the adsorption/desorption tower 2, where a heat exchange action takes place and the temperature of the adsorbent increases. The temperature of this hot brine decreases by the amount of heat, but in the conventional example, the temperature after the desorption period is lowered to ensure sufficient ozone desorption by increasing the temperature.
The capacity of the hot brine tank 6 and the temperature of the hot brine are determined so that the temperature is 10°C or higher.

Specifically, the warm brine temperature just before ozone desorption is
At 60°C, the hot brine capacity is almost equal to the adsorption/desorption tower capacity. In the case of removing microorganisms in the cooling water pipes of power plants mentioned earlier, the standard amount is about 5 m ³ , so the amount of warm brine required is about this amount, so the temperature can be raised to 50℃. The power consumption of the heater was large, and a large amount of brine was also required.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional apparatus, and an object of the present invention is to provide an intermittent ozone supply apparatus that reduces the power consumption of the apparatus and is inexpensive.

An embodiment of the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In the present invention, a heat exchanger 11 is provided in the warm brine tank 6, and a water tank 1 is provided in this heat exchanger.
A pump 13 is provided to circulate water within the container.

The operation of the present invention is exactly the same as the conventional example during ozone adsorption operation, but during ozone desorption, the pump 13 is operated in synchronization with the start of the hot brine pump 8, and the water in the water tank 12 is transferred to the heat exchanger. Send to 11. On the other hand, brine is supplied to the adsorption/desorption tower 2 by pump 8.
The cooled brine is heated in the heat exchanger 11 and sent to the adsorption/desorption tower 2 again.

As shown in the figure, the water used for heat exchange can be drawn from the aquarium or from the sea or river. In addition, in the case of an aquarium, the water temperature will drop slightly after ozone desorption is completed, but this water temperature will drop intermittently (once every day to several days).
Since it is only used once), if you leave it alone, the temperature will become equal to the outside temperature.

By providing a heat exchanger in this way, it is possible to use less than 1/10 of the amount of expensive hot brine compared to conventional methods, and the capacity of the hot brine tank 6 can also be small, making the equipment smaller and cheaper. Become. Furthermore, since the water used for heat exchange is almost equal to the outside temperature, water with an average temperature of 10°C or more can be obtained throughout the year. This eliminates the need for a conventional heat source such as a heater for heating brine, and has the advantage of lower power consumption than the conventional apparatus. Since the temperature of warm brine does not exceed the outside air temperature (conventionally, brine was heated to around 60°C to increase its heat capacity), there is greater freedom in selecting the type of brine. For example, conventional brines use trichlene or ethylene glycol, which have a low risk of ignition, but in the present invention, the brine is not heated, so ethyl alcohol or methyl alcohol, which has a lower viscosity than conventional brines, can be used. . Therefore, the heat transfer in the adsorption/desorption tower is improved compared to the conventional method, and the effect of increasing the temperature of the adsorbent is increased, which has the advantage of promoting ozone desorption.

As described above, according to the present invention, by incorporating a heat exchanger in the hot brine tank, the amount of hot brine can be reduced, and a heater is also unnecessary, so the device can be manufactured at a low cost, and the device can be easily manufactured. This has the effect of reducing power consumption.

[Brief explanation of the drawing]

Fig. 1a is a block diagram of a conventional intermittent ozone supply device, Fig. 1b is a diagram of the adsorption/desorption tower, Fig. 2 is the operation sequence of Fig. 1, and Fig. 3 is a diagram of the intermittent ozone supply device of the present invention. FIG. 1...Ozone generator, 2...Adsorption/desorption tower, 6...
Warm brine tank, 9... Refrigerator, 11... Heat exchanger, 13... Pump. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. It has an ozone generator that generates ozonized oxygen from raw material oxygen, and an adsorption/desorption tower that adsorbs ozone from the ozonized oxygen and desorbs this ozone. An intermittent ozone supply device that returns oxygen to the ozone generator, cools the adsorption/desorption tower during ozone adsorption, and causes warm brine to flow into the adsorption/desorption tower during ozone desorption to raise the temperature of the adsorption/desorption tower above that during adsorption. , an intermittent ozone supply device characterized in that a heat exchanger is built into the warm brine tank.