JPS618196A - Apparatus for intermittently supplying ozone - Google Patents

Abstract

PURPOSE:To prevent the back flow of water to an ozone adsorbing and desorbing tower by opening an ejector valve after the detection of negative pressure, by providing a pressure switch between the ejector valve and a check valve. CONSTITUTION:A pressure switch 13 for opening an ejector valve 5C upon the detection of negative pressure is provided between the ejector valve 5C and the check valve 12 provided to the flow passage reaching an ejector 10 from an adsorbing and desorbing tower 2. By this constitution, because the ejector valve 5C is opened after it is confirmed that the gas sucking side of the ejector 10 is brought to negative pressure, an intermittent ozone supply apparatus, wherein the back flow of water to the ozone adsorbing and desorbing tower 2 is prevented and reliability is high, is obtained.

Description

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

[Prior art]

Large amounts of cooling water are used in power plants, chemical industries, etc., but microorganisms and algae in the water cause slime problems, clogging pipes and reducing heat exchange rates. 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 to produce long-term so-called intermittent ozone water. The feeding device is advantageous in terms of equipment and operating costs.

An example of a typical conventional intermittent ozone supply device will be explained with reference to FIG. Figure 1 is a flow diagram showing a conventional intermittent ozone supply device. In the diagram, (1) is an ozone generator, and (2) is an ozone adsorption/desorption tower that adsorbs and accumulates ozone generated by this ozone generator. , (3) is a circulation blower that circulates oxygen gas from the ozone adsorption/desorption tower to the ozone generator (1), (4) is an oxygen supply device that supplies oxygen to the ozone generator (1), and (5a).

(5b) is a recycle valve, (5C) is an ejector valve, (6
) is a heating medium tank for heating the ozone adsorption/desorption tower (2), (7) is an electric heater installed in this heating medium tank, and (8) is a heating medium tank for heating the ozone adsorption/desorption tower (2). (9) is a refrigerator for cooling the ozone adsorption/desorption tower (2); (10) is a water ejector that sucks ozone from the ozone adsorption/desorption tower (2); (11) is an ejector pump that supplies water to be treated to this ejector, and (12) is a check valve that connects the ozone adsorption/desorption tower (2) to the ejector (10).
Ejector valve (5C) and check valve (12) in the flow path leading to
is provided.

The ozone adsorption/desorption tower (2) has a double cylinder structure, of which the inner cylinder is filled with ozone adsorbent, and a jacket is formed between the inner cylinder and the outer cylinder, and the heating medium is filled when the temperature rises. is,
It is connected to the heat medium tank (6).

Further, an evaporation tube is wound around the inner cylinder and is connected to a 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), circulation blower (3), ozone generator (1), recycle valve (5b), and ozone adsorption/desorption tower (2) constitute one circulation system in this order.

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 supply device (4)
Oxygen is constantly supplied into the circulatory system at a constant pressure. The recycle valves (5a) and (5b) open and the ejector valve (
5c) is closed. When oxygen is circulated in the circulation system by the circulation blower (3), a 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). Ozone adsorption/desorption tower (
The ozone adsorbent in 2) selectively adsorbs ozone, and the remaining oxygen passes through the recycle valve (5a) and is sent to the circulation blower (
3) is returned to the ozone generator (1). Oxygen consumed as ozone is replenished as appropriate from the oxygen supply device (4). At this time, the temperature of the ozone adsorbent is
It is cooled down to -30°C or lower. The refrigerator (9) uses a compressor to compress a heat medium such as air or ammonia gas to high temperature and high pressure, exchanges heat with water or air in a condenser, and the cooled heat medium is expanded by an expansion valve. The adsorbent is cooled by evaporation in the ozone adsorption/desorption tower (2). 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 ozone close to the saturated amount of adsorption, it shifts to the desorption operation.

During the desorption operation, an ozone generator (1), a circulation blower (3),
Refrigerator (9) stops operating and recycle valve (5a).

(5b) is closed and the heat medium pump (8) is operated to start increasing the temperature inside the adsorption/desorption group (2). The inside of the heat medium tank (6) is controlled to always have a constant temperature by an electric heater (7). This state is called preheating.

When the temperature inside the adsorption/desorption group (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 (5c) opens to reduce the pressure and suck the ozone in the adsorption/desorption group (2), while mixing water and ozone in the water jet ejector (10) to be used as ozone water. send to. Thus, the adsorption/desorption group (2)
When there is little ozone left in the tank, the desorption period ends, and the operation returns to the initial adsorption operation, where operation is repeated continuously.

Since the conventional intermittent ozone supply device is configured as described above, the pressure inside the ozonated water pipe is high, and the ejector valve (10) is activated at the same time as the ejector pump (11) is activated.
If the check valve (12) malfunctions due to foreign matter, the treated water will flow back into the ozone adsorption/desorption tower (2) and there is a risk of deteriorating the filler in the adsorption/desorption group (2). Ta.

[Summary of the invention]

This invention was made for the purpose of eliminating the drawbacks of the conventional ones as described above, and includes an ozone generator that generates ozonized oxygen from raw material oxygen, and an ozone generator that adsorbs and accumulates ozone from the ozonized oxygen. The ozone adsorption/desorption tower has an ozone adsorption/desorption tower, returns oxygen after ozone has been adsorbed by the ozone adsorption/desorption tower to the ozone generator, and desorbs and supplies ozone from the ozone adsorption/desorption tower with an ejector. In an intermittent ozone supply system in which the desorption tower is cooled by a refrigerator during ozone adsorption and heated by a heating source during ozone desorption, the ozone is removed between the ejector valve and the check valve provided in the flow path from the ozone adsorption/desorption tower to the ejector. By installing a pressure switch that detects negative pressure and opens the ejector valve, the ejector valve opens after confirming that the gas suction side of the ejector has negative pressure, thereby preventing water from flowing back into the ozone adsorption/desorption tower. The present invention provides a highly reliable intermittent ozone supply device.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a flow diagram showing an embodiment of the present invention. In the figure, the same parts as those in FIG. Ejector valve (5c) and check valve (12) provided in the flow path from the adsorption/desorption group (2) to the ejector (10)
A pressure switch (13) that detects negative pressure and opens the ejector valve (5c) is provided between the two.

The other configurations are the same as in FIG. 1.

Next, the operation will be explained. The basic operation is the same as that shown in FIG.

The ozone adsorption/desorption tower (2) is filled with a silica gel adsorbent, but in order for this adsorbent to effectively separate oxygen and ozone, the adsorption of water, etc. to the silica gel must be avoided as much as possible. Reduce by half. In particular, if water flows backward and the silica gel gets wet, the silica gel will be damaged and become unusable. In addition, silica gel is expensive because it is large in quantity, and the adsorption/desorption group (2) has a complicated structure for heating or cooling the filler, so it takes a considerable amount of time to remove and fill the silica gel. Therefore, it is necessary to prevent water from entering the silica gel filling.

In Figure 2, the ejector valve (5c) and check valve (12)
The pressure switch (13) installed between the ejector valve (5c) serves as a prerequisite for the opening operation of the ejector valve (5c). In this case, the pressure switch (13) detects negative pressure only after the ejector pump (11) is started and the piping between the ejector valve (5c) and the ejector (10) becomes negative pressure, which causes the ejector valve ( 5c) opens. If this condition is met, the pressure inside the adsorption/desorption group (2) will always be the same or higher than the pressure in the piping, and water will not flow back into the ozone adsorption/desorption tower (2). For example, if some foreign object enters the check valve (12) and it does not close completely, water will reach the outlet of the ejector valve (5c), but the pressure switch (13) will not detect negative pressure, so the ejector valve (5c) will never open. Moreover, if the pressure switch (13) is set to 2 positions, an abnormality alarm can be issued to the outside.

FIG. 3 is a flow diagram showing another embodiment, and in the figure, an ejector valve (5C) and a check valve (12) provided in the flow path from the adsorption/desorption group (2) to the ejector (10) are shown. Meanwhile, from the upstream side, a pressure switch (13) that detects negative pressure and opens the ejector valve (5c) and an ejector pump (11) are activated.
) are provided in this order. The other configurations are the same as in FIG. 1.

Next, the operation will be explained. The pressure switch (13) installed between the ejector valve (5C) and the shutoff valve (14)
) serves as a necessary condition for the opening operation of the ejector valve (5c). Here, the ejector pump (11) starts, the shutoff valve (14) opens, and the ejector valve (5C) and ejector (
10) The pressure switch (
13) detects negative pressure and the ejector valve (5c) opens.

The shutoff valve (14) has a pressure switch (13) and a check valve (12).
) and is installed between the ejector pump (11)
It becomes open at the same time as driving. Without the shutoff valve (14),
If foreign matter enters the check valve (12), water will flow back and the pressure switch (13) will shut down the device, but this abnormality often occurs when there are a lot of SS, slime, etc. in the water to be treated. On the other hand, the shutoff valve (14) is connected to the pressure switch (13).
) and the check valve (12), it will reduce the abnormal display phenomenon caused by the check valve (12), and will be more effective in preventing backflow of water than when there is no shutoff valve (14). Increased reliability. If an abnormality were to occur, this would lead to a serious accident, but the above prevents this from happening. In addition, if an abnormality occurs, the ejector valve (5
C) and the shut-off valve (14) are closed simultaneously.

In the above description, the ejector valve (5C) may be a solenoid valve, an electric cylinder valve, or an electric valve as long as it is non-leak, but it is necessary to pay sufficient attention to the opening and closing speed of the electric valve.

Furthermore, in the above description, the pressure switch (13) is shown as having two positions, but two pressure switches may be installed. Furthermore, the present invention is applicable not only to cooling water but also to cases where ozone is supplied to other liquids.

〔Effect of the invention〕

As described above, according to the present invention, since the pressure switch is provided between the ejector valve and the check valve, the ejector valve opens after the pressure switch detects that the pressure has become negative, so that no backflow of water occurs. First, even if foreign matter gets into the check valve and causes malfunction, there is no risk of water backflow.

In addition, if a pressure switch and a shutoff valve are installed between the ejector valve and the check valve, the occurrence of abnormalities due to malfunction of the check valve will be reduced, and the reliability of preventing the backflow of water to the adsorption/desorption group will be further increased. This has the effect of providing a highly stable device.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a conventional intermittent ozone supply device, and FIGS. 2, 2, and 3 are flowcharts showing an intermittent ozone supply device according to another embodiment 1 of the present invention. In the figure, (1) is an ozone generator, (2) is an ozone adsorption/desorption tower, and (3) is f! Ring blower, (4) is oxygen supply device, (5a), (5b) are recycle valves, (5C) is ejector valve, (6) is heat medium tank, (7) is electric heater,
(8) is a heat medium pump, (9) is a refrigerator, (10) is an ejector, and (11) is a heat transfer medium pump. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) It has 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, and the ozone adsorption/desorption tower generates ozone. The adsorbed oxygen is returned to the ozone generator, and ozone is desorbed and supplied from the ozone adsorption/desorption tower using an ejector, and the ozone adsorption/desorption tower is cooled by a refrigerator during ozone adsorption, and is cooled by a heating source during desorption. In an intermittent ozone supply device that increases temperature, a pressure switch is installed between an ejector valve and a check valve provided in a flow path from an ozone adsorption/desorption tower to an ejector to detect negative pressure and open the ejector valve. An intermittent ozone supply device featuring: (2) The intermittent ozone supply device according to claim 1, characterized in that the pressure switch is set at two positions or is provided with two pressure switches. (3) It has 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 the ozone, and the ozone adsorption/desorption tower generates ozone. The adsorbed oxygen is returned to the ozone generator, and ozone is desorbed and supplied from the ozone adsorption/desorption tower using an ejector, and the ozone adsorption/desorption tower is cooled by a refrigerator during ozone adsorption, and is cooled by a heating source during desorption. In an intermittent ozone supply device that increases temperature, a pressure switch is installed from the upstream side between an ejector valve and a check valve installed in the flow path from the ozone adsorption/desorption tower to the ejector to open the ejector valve by detecting negative pressure. , and an intermittent ozone supply device characterized by being provided with a shutoff valve that opens when the ejector pump is driven. (4) The intermittent ozone supply device according to claim 3, wherein the ejector valve is a solenoid valve, an air cylinder valve, or an electric valve.