JPS6259045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ozone adsorption/desorption tower that stores supplied ozone and releases the stored ozone.

Ozone adsorption/desorption towers are used in intermittent ozone supply devices that intermittently inject high-concentration ozone into water in power plants and the like to prevent microorganisms from adhering to and propagating in water pipes and the like.

In power generation plants, seawater, river water, etc. are used to generate electricity, and the used water is discharged.
Microorganisms adhere to and grow on the walls of pipes or heat exchangers through which the water flows, resulting in problems such as hindrances to the flow of the water. Therefore, in conventional power generation plants, chlorine gas or chemicals such as sodium hypochlorite are injected into the water pipes that take in seawater, river water, etc., and the sterilizing and algaecide effects of these chlorine gas and chlorine-based chemicals cause , the adhesion and propagation of microorganisms on pipe walls, etc., was prevented. However, in this case, chlorine or chlorine-based chemicals are used, which increases the cost and also requires wastewater treatment equipment to remove organic pollutants and toxic compounds from the plant's waste water. An inconvenience occurred.

An intermittent ozone supply device is used to overcome this conventional inconvenience. This device generates its own ozone and intermittently supplies high-concentration ozone into water flowing through pipes and the like to prevent the adhesion and propagation of microorganisms. Since this device uses ozone, it has better bactericidal and algaecide effects than the above-mentioned chlorine-based chemicals, and the self-decomposition time of ozone is short, so there is no risk of pollution. Furthermore, by intermittently supplying high-concentration ozone into the water in the pipe, the adhesion and propagation of microorganisms can be sufficiently prevented, and the total amount of ozone used can be significantly reduced.

Hereinafter, an intermittent ozone supply device will be explained, and a conventional ozone adsorption/desorption tower used therein will be explained.

FIG. 1 shows a schematic configuration of an intermittent ozone supply device. In the figure, the water pipe 10 includes the water to be treated 1
00 is supplied to the ejector 12 of the intermittent ozone supply device, and high concentration ozone is injected into the water to be treated 100 due to the ejector effect of the ejector 12, and the water to be treated 100 is turned into treated water 102.

In the apparatus of FIG. 1, oxygen 104 of the oxygen supply source 14
is supplied to an ozone generator 16, in which oxygen 104 is converted to ozone 106. Ozone 106 generated in this way
is supplied to the ozone adsorption/desorption tower 18 and accumulated in the ozone adsorption/desorption tower 18 over a long period of time. The highly concentrated ozone 108 accumulated in the ozone adsorption/desorption tower 18 is injected into the water to be treated 100 by the ejector 12 in a short time.

The ozone generator 16 and the conventional ozone adsorption/desorption tower 18 are shown in FIGS. 2 and 3, respectively, and the details of each will be explained below.

In FIG. 2, the oxygen 104 is introduced into the ozone generator 16 from the oxygen inlet 21 of the container 20, is converted into ozone 106, and is then introduced into the ozone outlet 21.
is discharged from. Note that in this device, all of the oxygen 104 supplied to the ozone generator 16 is not converted into ozone, and the ozone 106 is
It contains a considerable amount of oxygen, and this ozone 1
Oxygen in O. 06 is hardly accumulated in the ozone adsorption/desorption tower 18. Therefore, in FIG. 1, the oxygen 110 discharged from the ozone adsorption/desorption tower 18 is supplied again to the ozone generator 16 by the blower 23 in order to utilize it effectively.

The ozone generator 16 in FIG. 2 generates ozone by performing silent discharge in the supplied oxygen 104.
06 is being generated. For this reason, an external high-voltage AC power source is connected to the high-voltage electrode tube 26 via a high-voltage bushing 24 provided on the upper side of the device in FIG. A discharge is taking place. A high voltage fuse 30 is provided between the high voltage bushing 24 and the high voltage electrode tube 26, and the high voltage electrode tube 26 is insulated from the ground by an insulating block 32. and,
Approximately 10 percent of the energy from this discharge is used to generate ozone, while the remaining amount is converted to heat and the apparatus shown in FIG. 34 and an outlet 36 are provided, and cooling is performed by cooling water 103.

Next, the conventional ozone adsorption/desorption tower 1 shown in FIG.
8 will be explained.

In the apparatus shown in FIG. 3, silica gel 40 is used as an ozone adsorbing material that adsorbs ozone 106, accumulates ozone 106, and generates high concentration ozone 108 in a short time (desorption of ozone). When the silica gel 40 is cooled, its ability to adsorb ozone 106 increases, and when it is heated, its ability to desorb ozone 108 increases.
It has this property. Therefore, in this device,
The silica gel 40 is cooled during adsorption of ozone 106, and heated during ozone desorption, and for this purpose, a refrigerator 42 and a heating tank 44 are provided in FIG. 1. That is, during ozone adsorption when ozone 106 is being supplied, the refrigerator 42 is operated and the fluorocarbon 120 is
However, during ozone desorption, the antifreeze liquid 122 heated by the heater 46 of the heating tank 44 is supplied to the ozone adsorption/desorption tower 18 . In addition, in Figure 1,
A pump 48 is provided to supply antifreeze 122 to the ozone adsorption/desorption tower 18 .

In FIG. 3, silica gel 40 is housed in an inner container 50 which is a cylindrical column, and the inner container 50 is insulated from the outside air by an outer container 52 which is a cylindrical column. A cooling pipe 54 through which the above-mentioned Freon 120 flows is wound around the inner container 50, and the silica gel 40 is passed through the cooling pipe 54.
-40℃ to 60℃ due to Freon 120 flowing through 4
It is cooled to about ℃.

Also, the heated antifreeze 122 is transferred to the antifreeze inlet 5 provided at the lower part of the outer container 52 on the one hand.
6 is supplied between the inner container 50 and the outer container 52 , warms the silica gel 40 inside the inner container 50 from the outside, and is discharged from the outlet 58 provided at the top of the outer container 52 . On the other hand, the heated antifreeze liquid 122 spirally flows into the inner container 50 from an antifreeze liquid inlet 62 provided on the lower side of the device 18 together with an intake/exhaust common port 60 that shares the intake and discharge of ozone 106 and 108. A heating tube 63 shaped like
The liquid then reaches an antifreeze outlet 66 provided at the top of the device along with an oxygen outlet 64, and is collected in the heating tank 44. Therefore, the antifreeze liquid 122 flowing through the heating tube 63 warms the silica gel 40 from within.

Furthermore, in FIG. 1, between the discharge port 64 and the blower 23, between the discharge port 22 and the common intake/discharge port 60, and between the common intake/discharge port 60 and the ejector 12,
Solenoid valves 70, 72, and 74 are provided in each pipe line between the
0 and 72 are opened and the solenoid valve 74 is closed, and only the solenoid valve 74 is opened during ozone desorption.

The intermittent ozone supply device shown in FIG. 1 and its conventional ozone adsorption/desorption tower 18 are constructed as described above, and the operation thereof will be explained below using FIG. 4.

As mentioned above, this device uses high-concentration ozone 1
08 is intermittently injected into the water to be treated 100, and this period varies depending on the type and amount of microorganisms, the temperature of the water, etc., and is generally set at half a day to three days. Fourth
The figure shows an example in which ozone 108 is injected once a day.

First, the solenoid valves 70 and 72 are opened, the solenoid valve 74 is closed, and the ozone generator 16, refrigerator 42, and blower 23 start operating. Then, the ozone 106 is transferred to the cooled silica gel 4.
The remaining oxygen 110 is supplied to the ozone generator 16 and adsorbed by the silica gel 40 and returns to the ozone generator 16 again.
The above operation is continued for about 23 hours, and ozone is accumulated in the silica gel 40, so that the silica gel 40 becomes saturated.

When the above ozone accumulation is completed, the operation of the ozone generator 16, refrigerator 42, and blower 23 is stopped.
Solenoid valves 70 and 72 are closed.

Next, operation of the heating tank 44 and the pump 48 is started, preheating is performed for about 20 minutes, and when the preheating is finished, the silica gel 40 is heated to a predetermined temperature. Next, when only the electromagnetic valve 74 is opened, ozone 108 is desorbed and highly concentrated ozone 108 is injected from the ejector 48 into the water to be treated 100 by the ejection effect of the ejector 12. This ozone injection is carried out in a short period of about 5 minutes, and when the ozone injection time ends, the operation of the heating tank 44 and the pump 48 is stopped, and the solenoid valve 74 is closed.

Finally, the electromagnetic valves 70 and 72 are opened to replenish oxygen 104 into the apparatus.

The above operations are repeated to prevent microorganisms from adhering to and propagating on water pipes, heat exchangers, etc. According to this device, since oxygen is used as a raw material for ozone, its cost and operating cost are reduced.

However, it has not been possible to increase the size of the conventional ozone adsorption/desorption tower described above. This is due to the following reasons.

In the conventional device described above, ozone is desorbed from the inner wall of the inner container and the heating tube, that is,
The silica gel is heated from both the outside and inside of the silica gel. Here, since ozone is active inside the inner container, materials such as stainless steel must be used, and in particular, the heating tube cannot be formed into a complicated shape to expand the heat transfer area with the silica gel. In conventional devices, heating of silica gel relies largely on heat transfer of the silica gel itself. However, since silica gel is in the form of powder or granules and is thought to be in point contact with each other, heat transfer through the silica gel itself is extremely slow, so in conventional equipment, when the equipment becomes larger, there is insufficient heat transfer area for the silica gel. Therefore, it was not possible to efficiently desorb ozone. For this reason, the conventional apparatus has had the disadvantage that when the apparatus becomes large and a large amount of highly concentrated ozone is required from the intermittent ozone supply apparatus, it becomes impossible to supply ozone accordingly.

As mentioned above, ozone is periodically added to the water to be treated, but in the first conventional device, it takes a long time to cool a large amount of silica gel, so if the device becomes larger, In some cases, ozone accumulation may not be completed in time for ozone injection. Therefore, in this case as well, increasing the size of the device is restricted.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide an ozone adsorption/desorption tower that can quickly and efficiently cool and heat an ozone adsorbing substance.

In order to achieve the above object, the present invention provides a column filled with an ozone adsorbing material, a cooling pipe through which a cooling medium flows which cools the ozone adsorbing material during ozone absorption and desorption, and a cooling pipe that cools the ozone adsorbing material during ozone desorption. In an ozone adsorption/desorption tower having a heating tube through which heated antifreeze flows, a plurality of ozone adsorption tubes extending into the ozone adsorption material and in contact with the ozone adsorption material are provided in at least one of the cooling pipe and the heating pipe. It is characterized by the provision of a heat conductive plate.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 5 shows an intermittent ozone supply device using the ozone adsorption/desorption tower 18 according to the present invention.
In this figure, the same members as those in the previous figures are given the same reference numerals, and their explanations will be omitted. Furthermore, the fifth
In the figure, an automatic temperature control valve 79 is provided at the inlet of the cooling pipe 54 of the ozone adsorption/desorption tower 18 to automatically adjust the inflow amount of the fluorocarbon 120 to control the cooling temperature of the ozone adsorption/desorption tower 18 .

The ozone adsorption/desorption tower 18 according to the present invention shown in FIG. 5 is explained in detail in FIGS. 6 and 7.

In FIG. 6, the heating tube 63 is formed in a cylindrical shape, and a plurality of heat conductive plates 80 shown in FIG. 7 are each welded and fixed in parallel to this heating tube 63. Welding of each heat conductive plate 80 to the heating tube 63 is performed sequentially from the top or bottom of the heating tube 63, and this welding can be easily performed and there are very few welding defects.

Further, the silica gel 40 is replaced depending on its deterioration, and for this reason, the apparatus shown in FIG. 6 is provided with a silica gel inlet 82 and a silica gel outlet 84. As shown in FIG. 7, a plurality of holes 86 with a diameter of about 7 mm are uniformly formed in each heat conduction plate 80, and the silica gel 40 passes through the holes 86 of each heat conduction plate 80 into the container 5.
Silica gel 4 falls below 0 and enters the container 80.
Zero filling is easily done. Note that a silica gel receiving plate 88 is provided at the bottom of the heating tube 63.

The ozone adsorption/desorption tower 18 according to the present invention has the above configuration, and its operation will be explained below.

During ozone adsorption when ozone 106 is supplied, the silica gel 40 is cooled by the freon 120 flowing through the cooling pipe 54 wound around the outside of the container 50. In the apparatus shown in FIG.
0, the silica gel 40 near the center of the container 50 is also cooled in the same way as the silica gel 40 near the outside of the container 50, so the time required to cool the silica gel 40 is significantly shortened compared to the conventional device described above. Furthermore, the plurality of holes 86 uniformly formed in the heat conduction plate 80 ensure the flow of the ozone 106 inside the container 50, and the flow is made uniform. It can be evenly adsorbed onto the silica gel 40 without blocking the flow.

Then, during ozone desorption, the heating pipe 63
Antifreeze 122 heated to
22 is transferred to the silica gel 40 by the heat conductive plate 80 that is in direct contact with the silica gel 40, the silica gel 40 is quickly heated and the container 5 is heated.
0, a high concentration of ozone 108 will be generated within a short period of time. Note that the discharge of ozone 108 from the container 50 is not prevented by each heat conduction plate 80 because the heat conduction plate 80 has holes 86 formed therein.

As explained above, according to the present invention, since the heat transfer area is expanded by the heat conduction plate, the ozone adsorption/desorption substance can be quickly and efficiently cooled and heated, so that ozone adsorption and desorption can be shortened. This can be done in a short amount of time, and this is particularly advantageous when the device is enlarged.

Further, if the apparatus shown in FIG. 6 is to be made larger, it is preferable to provide a structure in which a plurality of heating tubes are provided to support the heat conductive plate.

In the apparatus shown in FIG. 6, in order to further facilitate the replacement of silica gel, it is preferable to have a structure in which the heat conductive plate is inclined several degrees with respect to the cooling pipe.

As mentioned above, in the apparatus shown in FIG. 6, it is easy to weld each heat conductive plate to the heating tube, but the cost required for this welding is lower than that of conventional methods, Weld defects are also extremely rare. Since welding defects do not occur in the heating tube in this way, it is possible to prevent an accident in which the antifreeze fluid flows into the silica gel and renders the device unusable.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an ozone intermittent supply device using a conventional ozone adsorption/desorption tower, Fig. 2 is a configuration explanatory diagram of the ozone generator 16 in Fig. 1, and Fig. 3 is a diagram of a conventional ozone adsorption/desorption tower. 4 is an explanatory diagram of the operation of the device shown in FIG. 1, FIG. 5 is a schematic diagram of the structure of an intermittent ozone supply device using an ozone adsorption/desorption tower according to the present invention, and FIG. FIG. 7 is an explanatory diagram of the configuration of the ozone adsorption/desorption tower, and FIG. 7 is an explanatory diagram of the configuration of the heat conductive plate. The same members in each figure are given the same reference numerals, 18 is an ozone adsorption/desorption tower, 40 is silica gel, 50 is an inner container, 54 is a cooling pipe, 63 is a heating tube, 80 is a heat conduction plate, 106, 108 are Ozone, 120 is Freon,
122 is antifreeze.

Claims (1)

[Scope of Claims] 1. A column filled with an ozone adsorbing substance, a cooling pipe through which a cooling medium flows which cools the ozone adsorbing substance during ozone absorption and desorption, and an antifreeze liquid that warms the ozone adsorbing substance during ozone desorption. In an ozone adsorption/desorption tower having a heating pipe through which flow flows, at least one of the cooling pipe and the heating pipe is provided with a plurality of heat conductive plates extending into the ozone adsorbing material and in contact with the ozone adsorbing material. This is an ozone adsorption/desorption tower. 2. The ozone adsorption/desorption tower according to claim 1, characterized in that a plurality of holes are formed in the heat conduction plate.