JPS6034484B2 - Intermittent ozone supply device - Google Patents

Description

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

Ozone has strong oxidizing power and is non-polluting, so 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). In order to prevent
(times per minute) and is used to suppress the growth of the above microorganisms. When ozone is used intermittently in this way, the ozone generator is also operated intermittently, which requires a large ozone generator with high equipment costs. The ozone generated is stored in low-temperature silica gel for a long period of time (one to several days), and several ozone supply devices are used to desorb the ozone all at once in a few minutes. FIG. 1 shows a conventional example of an ozone supply system.

In the configuration diagram shown in FIG. 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, 6 is a hot brine tank, 7 is a heater,
8 is a pump for hot brine, 9 is a refrigerator, and 10 is a water ejector. Further, in the block diagram of the adsorption/desorption tower 2 shown in FIG. 1b, 2-1 is an ozone adsorbent, and silica gel is usually used. 2-2 is the inner cylinder, 2-3 is the outer cylinder, 2-4
2-5 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. 3, 5-4 is closed. Oxygen is supplied from the oxygen supply source 4 so that the system pressure is constant (usually 2), and the ozonized oxygen generated by the ozone generator 1 is introduced into the adsorption/desorption tower 2, where only ozone is is adsorbed by the adsorbent. A so-called oxygen recycling system is constructed in which 95% or more of the oxygen that was not ozonated by the ozone generator 1) is returned to the ozone generator 1 by a circulation blower 3 and used for circulation. The 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 has been cooled down to below 00. Normally, this cooling is done by the inner cylinder 2-2.
This is done by evaporating the freon compressed by the refrigerator 1 through the evaporator tube 2-5 that is in close contact with the refrigerator 1. In this way, ozone is adsorbed in the adsorption/desorption tower 2, but after a predetermined period of time, ozone leaks from the gas outlet of the adsorption/desorption tower 2 when the adsorbent is nearly saturated with ozone adsorption.

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 set in advance. Next, the ozone removal operation will be explained.

When the ozone desorption operation starts, the solenoid valves 5-1 and 5-2 close, and the solenoid valves 5-3 and 5-4 open, and water flows through the water ejector 01, suctioning the ozone in the adsorption and desorption tower 2 under reduced pressure, and water is released. Make ozonated water by dissolving it in At the same time, the pump 8 operates, and the brine in the hot brine tank 6, which has been heated in advance by the heater 7 (usually 5000 ℃), flows into the adsorption/desorption brine tank 2-4, where it is cooled to a low temperature during the adsorption operation. The desorption of ozone is promoted by raising the temperature of the adsorbent. The ozone adsorption operation takes a long time (one to several days), but the ozone desorption 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 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 this way, in the conventional example, the heat transfer part (inner cylinder 2-2 in Fig. 1b) is used to cool the adsorbent during the ozone adsorption period, and the heat transfer part (inner cylinder 2-2 in Fig. 1b) is used to heat the adsorbent during the ozone desorption period. The problem is that the heat transfer parts for both are the same.

That is, since the ozone adsorption period is one to several days, it may take several hours until the ozone desorption period ends and the adsorbent is cooled down to -30 qo or less again, but on the other hand, the ozone desorption period is a few minutes. The temperature required during these few minutes (
The temperature of the adsorbent must be raised to 100°C or higher.
In this way, the same heat transfer section includes those that can be cooled relatively slowly and those that need to be heated rapidly. Therefore, in order to satisfactorily adsorb and desorb ozone, the dimensions of the heat transfer part (inner cylinder 2-2) must be designed so that the adsorbent cooled to -3000 or less becomes 1oo○ or more in a few minutes. This is necessarily over-designed for cooling, which may take several hours. For example, if the cooling temperature of the adsorbent is -30
00 and the temperature of the warm brine is 50q○, in order to desorb ozone in a few minutes, the diameter of the inner cylinder 2-2 should be
You must use something of grade C. However, the standard scale ozone supply equipment used for biological removal from cooling water pipes in power plants, as mentioned above, requires a large capacity of ozone and a large adsorbent capacity. . For this reason, it is necessary to manufacture hundreds of inner cylinders 2-2 lined up, resulting in a complicated apparatus. The present invention was made in order to eliminate the drawbacks of the previous model, by improving the heat transfer part of the adsorption/desorption tower and increasing the capacity per roll of the inner cylinder filled with adsorbent. The object of the present invention is to provide an ozone supply device that is simplified in structure.

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 their explanation will be omitted. The present invention resides in that a flexible pipe 2-6, which serves as a flow path for hot brine, is disposed within the inner cylinder 2-2. The adsorption/desorption tower 2 configured in this way has an evaporation tube 2-2 during the ozone adsorption period.
The cold heat generated in step 5 cools the adsorbent inside through the heat transfer part of the inner cylinder 2-2, but it takes several hours to reach a predetermined temperature (-3
The dimensions of the inner cylinder are set so that it is cooled to a temperature of 0.000 or less.

On the other hand, during the desorption operation, warm brine flows from the overflow brine inlet 2a of the adsorption/desorption tower 2, passes through the flexible pipe 2-6, then enters the adsorption/desorption brine tank 2-4, and exits from the warm brine outlet 2b. As a result, in the adsorption/desorption tower 2 according to the present invention, the temperature of the adsorbent can be increased through the heat transfer parts of both the flexible tube 2-6 and the inner cylinder 2-2 during the ozone desorption period. That is,
In the present invention, the area of the heat transfer section that is rapidly raised is larger than that of the heat transfer section that may be cooled relatively slowly. FIG. 4 shows experimental results comparing the present invention and a conventional example.

The experimental conditions were: adsorbent temperature during ozone adsorption -30oo, warm brine initial temperature 5000, ozone desorption time 5 minutes,
The horizontal axis is the diameter d (skin) of the inner cylinder, and the vertical axis is the ozone desorption rate 8. This desorption rate 3 is expressed by the following formula.

Amount of ozone desorbed during the ozone desorption period 8 = Amount of ozone adsorbed in the adsorption/desorption tower immediately before ozone desorption x 100 [%] In general, in the Mata ozone generator, B =
50 is considered standard, and as can be seen in FIG. 4, the conventional inner cylinder has d=3 cm at P=20.

On the other hand, in the present invention, even if the inner cylinder has d=6 skin, B=5
0 can be satisfied. In other words, by simply installing the flexible pipe 2-6 for raising the temperature of the adsorbent inside the conventional inner cylinder, the diameter of the inner cylinder can be doubled, which reduces the adsorbent capacity (volume) per column. ) can be multiplied by 4. Therefore, according to the present invention, in the case of an intermittent ozone supply device that generates a large amount of ozone, the number of adsorption and desorption towers is reduced from the conventional one.
/4, which has the advantage of making the device simpler and cheaper. In addition, in the example, a coiled pipe is arranged inside the inner cylinder of the adsorption/desorption tower, but a flat plate may be used as long as it is a heat transfer body, and in either case, the heat transfer part for cooling is It is sufficient if the area of the heat transfer part for temperature increase is larger than the area.

As described above, according to the present invention, since the heat transfer section for heating is provided inside and around the adsorption/desorption tower, the temperature of the adsorbent can be raised more rapidly than cooling, and the adsorption/desorption tower can increase the temperature of the adsorbent. The agent capacity can be increased and the number of adsorption/desorption towers can be reduced.

Since the ozone adsorption tower can be designed rationally in this way, the ozone supply device is simple and can be manufactured at low cost, which has great practical effects.

[Brief explanation of the drawing]

Fig. 1a is a block diagram of the subordinate ozone supply device, Fig. 1b is a diagram of the same adsorption/desorption tower, Fig. 2 is the operation sequence of Fig. 1, and Fig. 3 is an absorption diagram of the ozone supply device of the present invention. FIG. 4 is a graph showing the experimental results of the present invention and the conventional example. 1... Ozone generator, 2... Adsorption/desorption tower, 2-2...
・Inner cylinder, 2-4...Adsorption/desorption brine tank, 2-6...
Serpentine pipe, 6... Warm brine tank, 8... Pump, 9...
・Freezer, 10...Water ejector. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. 1st
Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. An ozone generator that generates ozonized oxygen from raw material oxygen, an adsorption/desorption tower filled with ozone adsorbent and through which ozonized oxygen is passed, and an ozone generator for cooling the ozone adsorbent during ozone adsorption. A cooling heat transfer section provided around the adsorption/desorption tower; a heating heat transfer section provided inside and around the adsorption/desorption tower to raise the temperature of the ozone adsorbent during ozone desorption; An intermittent ozone supply device characterized by comprising an ozone collection means for collecting ozone from an adsorption/desorption tower.