JPS6313927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an intermittent ozone supply device.

[Prior art]

A large amount of cooling water is used in power plants, chemical industries, etc., but microorganisms and algae in the water cause slime problems, clogging pipes and reducing heat exchange efficiency. As a preventive measure against these problems, the application of highly concentrated ozonated water is being considered. In order to generate this highly concentrated ozone water, rather than using a large-capacity ozone generator, it is necessary to use a small, small-capacity ozone generator and use the generated ozone as an adsorbent for a long period of time. A so-called intermittent ozone supply device, which removes the accumulated ozone from an adsorbent at once to produce highly concentrated ozone water, is advantageous in terms of equipment costs and operating costs.

An example of a typical conventional intermittent ozone supply device will be explained with reference to the drawings. The figure is a flow diagram showing a conventional intermittent ozone supply device. In the figure, 1 is an ozone generator, 2 is an ozone adsorption/desorption tower that adsorbs and accumulates ozone generated by this ozone generator, and 3 is this ozone absorber. A circulation blower circulates oxygen gas from the desorption tower to the ozone generator 1, 4 is an oxygen supply device that supplies oxygen to the ozone generator 1, 5a and 5b are recycle valves, 5c is an ejector valve, and 6 is an ozone adsorption/desorption tower 2
A heating medium tank 7 is an electric heater provided in this heating medium tank, 8 is a heating medium pump that supplies the heating medium from the heating medium tank 6 to the ozone adsorption/desorption tower 2, and 9 is a cooling device for the ozone adsorption/desorption tower 2. 10 is a water jet ejector for sucking ozone from the ozone adsorption/desorption tower 2;
12 is a check valve, 13 is a safety valve, and 14 is an ozone adsorption/desorption tower internal temperature indicating controller.

The ozone adsorption/desorption tower 2 has a double cylinder structure, of which the inner cylinder is filled with an ozone adsorbent, a jacket is formed between the inner cylinder and the outer cylinder, and a heat medium is filled when the temperature is raised. It is connected to the heat medium tank 6. Further, an evaporation tube is wound around the inner cylinder and is connected to the refrigerator 9. Silica gel is generally used as the ozone adsorbent, and ethylene glycol, alcohols, etc. are used as the heat medium.

The recycle valve 5a, the circulation blower 3, the ozone generator 1, the recycle valve 5b, and the ozone adsorption/desorption tower 2 constitute one circulation system.

Next, the operation will be explained. This operation mainly includes two operations: an ozone adsorption operation and an ozone desorption operation.

First, the suction operation will be explained. Oxygen is constantly supplied into the circulation system from the oxygen supply device 4 at a constant pressure. The recycle valves 5a and 5b are open, and the ejector valve 5c is closed. When oxygen is passed through the circulation system by the circulation blower 3, part of the oxygen is converted into ozone by silent discharge while passing through the discharge gap of the ozone generator 1, and becomes ozonized oxygen. This ozonized oxygen is transported to the ozone adsorption/desorption tower 2. The ozone adsorbent in the ozone adsorption/desorption tower 2 selectively adsorbs ozone, and the remaining oxygen is passed through the recycle valve 5a and sent to the ozone generator 1 by the circulation blower 3.
will be returned to. Oxygen consumed as ozone is
The oxygen is replenished from the oxygen supply device 4 as appropriate. At this time, the temperature of the ozone adsorbent is cooled down to −30° C. or lower by the refrigerator 9. The refrigerator 9 uses a compressor to compress the heat medium, fluorocarbon or ammonia gas, to high temperature and high pressure, and the condenser exchanges heat with water or air. The adsorbent is cooled by evaporation. The amount of ozone adsorbed by the ozone adsorbent varies greatly depending on the temperature. For example, when the temperature is lowered, the amount of ozone adsorbed increases, and conversely, when the temperature is raised, the amount of ozone adsorbed is decreased. Therefore, when desorbing ozone, the temperature of the ozone adsorbent is increased.

When the ozone adsorbent in the ozone adsorption/desorption tower 2 adsorbs nearly the saturated amount of ozone, it shifts to the desorption operation.
During the desorption operation, the ozone generator 1, circulation blower 3, and refrigerator 9 stop operating, and the recycle valves 5a and 5b stop operating.
is closed, and the heat medium pump 8 is operated to start raising the temperature inside the adsorption/desorption tower 2. Inside the heat medium layer 6 is an electric heater 7
The temperature is always controlled to be constant. This state is called preheating.

When the temperature inside the adsorption/desorption tower 2 reaches a certain value, the ejector pump 11 starts and at the same time, the water ejector 10 starts the suction operation, and the ejector valve 5
c is opened and the ozone in the adsorption/desorption tower 2 is depressurized and sucked, while the water and ozone are mixed in the water jet ejector 10 and sent to the point of use as ozonated water. Thus,
When less ozone remains in the adsorption/desorption tower 2, the desorption period ends, and the operation returns to the initial adsorption operation, and the operation is repeated continuously. Additionally, if any abnormality occurs in any device, all devices are immediately shut down.

Since the conventional intermittent ozone supply device is configured as described above, if an abnormality occurs in one of the component devices, all devices will stop, and the temperature inside the ozone adsorption/desorption tower 2 will rise. Since the entire recycling system is in a pressurized state, specifications of design conditions must be increased, and since ozonized oxygen is released from the safety valve 13, there are disadvantages in that it is dangerous and lacks economic efficiency.

[Summary of the invention]

This invention was made with the aim of eliminating the above-mentioned drawbacks of the conventional ozone adsorption/desorption tower, and the cooling equipment for the ozone adsorption/desorption tower operates even if an abnormality occurs in other equipment to control the temperature at the time of ozone adsorption. By this,
By selecting equipment that will shut down even if a malfunction occurs in the equipment, this will prevent the pressure increase in the recycling system without increasing the temperature inside the ozone adsorption/desorption tower, making intermittent operation highly reliable, economical, and less dangerous. The present invention provides an ozone supply device.

[Embodiments of the invention]

The invention will now be explained with reference to the figures. The figure also shows an embodiment of the invention. In the figure, the basic configuration is the same as the conventional one, but a circulation blower 3,
The cooling equipment of the ozone adsorption/desorption tower 2, which consists of the recycling valves 5a and 5b and the refrigerator 9, continues to operate even if an abnormality occurs in other equipment. It's starting to stop. The recycle valves 5a and 5b are closed when not energized. The other configurations are the same as the conventional one.

In the intermittent ozone supply device configured as described above, the basic operation is the same as that of the conventional one. Of the three steps of operation of the intermittent ozone supply device, namely ozone adsorption, preheating, and ozone desorption, most of them are ozone adsorption steps. If an abnormality occurs during this process, the temperature inside the adsorption/desorption tower 2 will drop to -30°C.
Since the refrigerator 9 stops when the temperature is below ℃, the temperature starts to rise. In this case, if the recycle valves 5a and 5b are in the non-energized state, the entire recycle valve will be pressurized and the pressure will be about 3 to 5 times the normal pressure, so it is necessary to improve the specifications of each device. Therefore, in the present invention, the equipment to be stopped is selected depending on the equipment that causes the abnormality, and at least the pressure increase in the ozone adsorption/desorption tower 2 is prevented.

In the figure, if any of the ozone generator 1, oxygen supply device 4, heat medium pump 8, ejector pump 11, and ejector valve 5c develops an abnormality, all of them stop, but the circulation blower 3, The recycle valves 5a, 5b and the refrigerator 9 are operated, thereby making it possible to control the ozone adsorption temperature to -30°C or lower.

Next, the circulation blower 3, recycle valves 5a, 5b
If any abnormality occurs in the refrigerator 9, the refrigerator 9 stops together with the other equipment, thereby stopping all the equipment in the apparatus. At this time, the recycling valves 5a and 5b are closed when energized, so even if an abnormality occurs in the three devices mentioned above, no pressure rise will occur in the recycling system, and the pressure rise in the ozone adsorption/desorption tower 2 will not increase. The pressure increase due to temperature is released to the outside of the system by the safety valve 13.

In the above embodiment, a circulation blower 3 and recycle valves 5a, 5 are used as cooling equipment for the ozone adsorption/desorption tower 2.
b and the group of refrigerators 9 were operated in the same manner, but if the temperature can be controlled by the refrigerator 9 alone, the above operation may be performed using only the refrigerator 9 as a cooling device. Further, the present invention is applicable not only to cooling water but also to the case where ozone is supplied to other liquids.

〔Effect of the invention〕

As described above, according to this invention, the cooling equipment of the ozone adsorption/desorption tower is made to operate even when an abnormality occurs in other equipment. The adsorption/desorption tower can be cooled, and if a recycle valve that is closed when not energized is used, no pressure increase occurs in the recycle system, thus providing a highly reliable, inexpensive, and less dangerous device. be able to.

[Brief explanation of the drawing]

The figure is a flow diagram showing an intermittent ozone supply device according to a conventional method and an embodiment of the present invention. In the figure, 1 is an ozone generator, 2 is an adsorption/desorption tower, 3 is a circulation blower, 4 is an oxygen supply device, 5a,
5b is a recycling valve, 6 is a heat medium layer, 7 is an electric heater, 8 is a heat medium pump, 9 is a refrigerator, 10 is an ejector, 11 is an ejector pump, 12 is a check valve,
13 is a safety valve, and 14 is an ozone adsorption/desorption tower internal temperature indicating controller.

Claims (1)

[Scope of Claims] 1. An ozone generator that generates ozonized oxygen from raw material oxygen, and an ozone adsorption/desorption tower that adsorbs and accumulates ozone from the ozonized oxygen and desorbs this ozone.
It has a circulation blower and a recycle valve that constitute a circulation system together with the ozone generator and the adsorption/desorption tower,
Oxygen after ozone has been adsorbed by the ozone adsorption/desorption tower is returned to the ozone generator, and ozone is desorbed and supplied from the ozone adsorption/desorption tower by an ejector, and the ozone adsorption/desorption tower is cooled by a refrigerator during ozone adsorption. However, in an intermittent ozone supply system in which the temperature is raised by a heating source during desorption, the cooling equipment for the ozone adsorption/desorption tower continues to operate even if an abnormality occurs in other equipment, and the temperature is controlled to the same level as when ozone is adsorbed. Features: Intermittent ozone supply device. 2. The intermittent ozone supply device according to claim 1, wherein the cooling device is stopped together with other devices when an abnormality occurs in a device constituting the cooling device. 3. The intermittent ozone supply device according to claim 1 or 2, wherein the cooling equipment is a circulation blower, a recycle valve, and a refrigerator. 4. The intermittent ozone supply device according to claim 3, wherein the recycle valve is closed when energized.