JPS6048443B2 - Intermittent ozone supply device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an intermittent ozone supply device.

Because ozone has strong oxidizing power and is non-polluting, 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 cause organisms such as algae and shellfish to adhere to cooling water pipes in power plants, chemical plants, and machine factory equipment, reducing their function by reducing the heat exchange rate and clogging the pipes. Intermittent (1 to It is used to suppress the reproduction of the above-mentioned organisms by injecting ozone (once or several times 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), and when necessary, desorbs the ozone all at once in a few minutes and injects it into the water to be treated. It is being said. Figure 1a is a flow diagram showing a conventional intermittent ozone supply system, and Figure 1a is a vertical sectional view showing its adsorption/desorption tower. a desorption tower, 3 a circulation blower for circulating oxygen from the adsorption/desorption tower to the ozone generator 1; 4 an oxygen supply source to the ozone generator 1; 5a to 5;
d is a solenoid valve; 6 is a warm brine tank that receives brine from the adsorption/desorption tower 2; 7 is a heater provided in the warm brine tank 5; 8 is a pump that sends warm brine to the adsorption/desorption tower 2;
9 is a refrigerator, 10 is a water ejector, 11 is an ozone generator 1
This is a cooling water pump for.

Further, in FIG. 1, 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, 2c is an outer cylinder, 2d is an adsorption/desorption brine tank provided between these inner and outer cylinders, and 2e is in close contact with the inner cylinder 2b and is connected to the refrigerator 9. This is an evaporation tube.

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. First, to explain the ozone adsorption operation, the ozone generator 1, the adsorption/desorption tower 2, and the circulation proa 3 constitute an oxygen circulation system in this order, and the solenoid valves 5a and 5b open,
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 ozonated in the ozone generator 1 is returned to the ozone generator 1 by a circulation proa 3 for circulation. The amount of ozone adsorbed by the adsorption/desorption tower 2 increases as the temperature of the silica gel decreases, so during the ozone adsorption period, the refrigerator 9
It is cooled to over 30'C. Normally, this cooling is performed by evaporating freon compressed by the refrigerator 9 in the evaporator tube 5b that is in close contact with the inner cylinder 2b. In this way, ozone is adsorbed in the adsorption/desorption tower 2, but after a desired period of time has elapsed, the ozone is absorbed! When the adhesive 2a approaches ozone adsorption saturation, ozone leaks from the gas outlet of the adsorption/desorption tower 2.

If this leak starts and the suction operation continues, the device will lose power, so the suction operation is ended here and the desorption operation is started. Note that this adsorption time 5 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 electromagnetic valves 5c and 5d open, water flows into the hydraulic sector 10, and 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 hot brine tank 6 is heated in advance (usually 50'C) by the heater 7.
The brine inside flows into the adsorption/desorption brine tank 2d, which raises the temperature of the ozone adsorbent 2a, which had been cooled to a low temperature during the adsorption operation, to promote the desorption of zon. The adsorption operation of ozone takes a long time (1 to several days), but the desorption of ozone takes a short time (several minutes) by raising the temperature and reducing the pressure of the adsorption/desorption tower 2 as described above.
It will be held in

After the desorption is completed, the ozone adsorption operation begins 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,
At the time of ozone desorption, hot brine enters the adsorption/desorption tower 2, where a heat exchange action is performed and the temperature of the ozone adsorbent 2a is raised.

The temperature of this hot brine decreases by the amount of heat, but in the conventional example, the capacity and temperature of the hot brine tank 6 are adjusted so that the temperature after the end of the desorption period 7 is 10°C or higher so that ozone desorption due to temperature increase can be sufficiently performed. The temperature of the brine is determined.
Specifically, the warm brine temperature just before ozone desorption is 60°C.
The hot brine capacity is approximately equal to the capacity of the adsorption/desorption tower 2. In the case of removing living things from the cooling pipes of power plants mentioned earlier, the standard one is about 5.
Since this amount of warm brine is required, the temperature is 50°C.
The power consumption of the heater to raise the temperature to 100% was high, and a large amount of brine was also required. Furthermore, in order to increase the ozone generation yield, the conventional ozone generator 1 generally uses a pump 1.
The electrode portion is cooled by the cooling water supplied from 1, and the cooling water is directly drained to recover the waste heat.

The present invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and includes a heat exchanger built in a warm brine tank and a means for supplying cooling waste water flowing out from an ozone generator to the heat exchanger. An object of the present invention is to provide an intermittent ozone supply device that has low power consumption and is inexpensive.

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

FIG. 3 is a flow diagram showing one embodiment of the present invention, and the first
The same parts as those in the figures are given the same reference numerals and the explanation will be omitted. In the present invention, a heat exchanger 12 is provided in the warm brine tank 6,
A pipe 13 for introducing cooling waste water from the ozone generator 1 is connected to this heat exchanger, and a pump 11 supplies the cooling waste water from the ozone generator 1 to the heat exchanger 12. Next, to explain the operation of the present invention, the cooling water pump 11 is operated in synchronization with the starting of the ozone generation crosspiece 1,
The cooling water cools the ozone generator 1, and the heated cooling water is installed in the hot line tank 6 from the piping 13. Heat exchanger 1
2, and the exhaust heat from the ozone generator 1 is recovered through the heat exchanger 12. All other basic operations, such as ozone generation, ozone adsorption, ozone desorption, and oxygen filling, are the same as the operation sequence shown in FIG. 2. In this way, during the ozone adsorption operation, the exhaust heat of the ozone generator 1 is simultaneously recovered by the heat exchanger 12 in the hot brine tank 6, and the temperature of the brine is increased. On the other hand, during the ozone desorption operation, the hot line flows into the adsorption/desorption tower 2 by the pump 8 and is heat exchanged.
The heat is used to raise the temperature of the adsorption/desorption tower 2. By installing a heat exchanger in this way and recovering the waste heat from the ozone generator and using it to raise the temperature of the brine, there is no need for a conventional heat source such as a heater for heating the brine, reducing running costs. This has the advantage that it is possible to achieve this and that the device is inexpensive.

Also, compared to using a room temperature frying machine for the above purpose,
There are also advantages such as not having to use large amounts of expensive brine. In the above embodiment, the cooling waste water of the ozone generator 1 is supplied to the heat exchanger 12 by the discharge pressure of the pump 11, but a separate pump may be provided in the pipe 13.

Further, the intermittent ozone supply device of the present invention is applicable not only to the above-mentioned applications but also to all kinds of applications. As described above, according to the present invention, by incorporating a heat exchanger in the warm brine tank and recovering and utilizing the exhaust heat of the ozone generator,
Since a heating heater is not required, the device can be manufactured at a low cost, and the power consumption of the device can be reduced.

[Brief explanation of the drawing]

FIG. 1a is a flow diagram showing a conventional intermittent ozone supply device;
FIG. 1b is a vertical sectional view showing the adsorption/desorption tower, FIG. 2 is an operation sequence diagram of FIG. 1, and FIG. 3 is a flow diagram showing the intermittent ozone supply apparatus of the present invention. 1...Ozone generator, 2...Adsorption/desorption tower, 6.
... Warm brine tank, 9... Refrigerator, 11... Cooling water pump, 12... Heat exchanger.

Claims (1)

[Scope of Claims] 1. 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 the ozone, and the adsorption/desorption tower generates ozone. After the oxygen has been adsorbed, the oxygen is returned to the ozone generator, the adsorption/desorption tower is cooled during ozone adsorption, and warm brine is flowed from the warm brine tank into the adsorption/desorption tower during ozone desorption, and the adsorption/desorption tower is cooled during ozone desorption. In the intermittent ozone supply device, the ozone supply device has a heat exchanger built in the warm brine tank, and a means for supplying cooled wastewater heated by cooling the ozone generator to the heat exchanger. An intermittent ozone supply device characterized by comprising: 2. Claim 1, characterized in that it is equipped with a pump that sends cooling water to the ozone generator, and piping that allows cooling waste water flowing out from the ozone generator to flow into a heat exchanger of a warm brine tank. Intermittent ozone supply device.