JP6834624B2 - Water treatment equipment - Google Patents

Description

The present invention relates to a water treatment apparatus including an excimer lamp through which water flows.

Conventionally, as a water treatment device, a water treatment device including an excimer lamp through which water flows is known (for example, Patent Document 1). The excimer lamp includes a translucent inner tube through which water flows inside, and a dielectric outer tube in which the inner tube is arranged inside and gas is filled between the inner tube and the inner tube.

In the water treatment apparatus according to Patent Document 1, the inner pipe is provided with a stirring member for stirring water inside. By the way, even if the stirring member has translucency, the light radiated from between the inner pipe and the outer pipe is reflected by the stirring member when it is irradiated to the water flowing inside the inner pipe. It is diffused or absorbed. This reduces the efficiency of water treatment.

Japanese Unexamined Patent Publication No. 2016-376772

Therefore, the problem is to provide a water treatment apparatus capable of improving the water treatment efficiency.

The water treatment device includes an excima lamp through which water flows inside and an inflow portion where water flows inside and flows into the excima lamp. The excima lamp is translucent in which water flows inside. The pipe and the inner pipe are arranged inside, and the outer pipe of the dielectric in which gas is filled between the inner pipe and the outer pipe and the gas are arranged facing each other so as to intervene between them. The inflow portion includes a first and second electrodes to which a voltage is applied to the water, and the inflow portion includes a turbulent flow generation portion that increases the Reynolds number of the flow by passing water.

Further, in the water treatment apparatus, the first and second electrodes may be arranged outside the outer pipe, respectively.

Further, in the water treatment apparatus, the width dimension of the first and second electrodes is the inner pipe in the direction in which the first and second electrodes face each other and in the direction orthogonal to the axial direction of the inner pipe, respectively. It may be configured to be larger than the outer width dimension of.

As described above, the water treatment apparatus has an excellent effect that the water treatment efficiency can be improved.

FIG. 1 is an overall schematic view of a TOC measuring device in which the water treatment device according to the embodiment is used. FIG. 2 is an overall sectional view of the water treatment apparatus according to the same embodiment. FIG. 3 is an enlarged sectional view taken along line III-III of FIG. FIG. 4 is a cross-sectional view of the water treatment apparatus according to the same embodiment, and is a diagram for explaining the action and effect. FIG. 5 is a diagram showing the relationship between the illuminance attenuation rate of light and the transmission distance in water. FIG. 6 is a cross-sectional view of the water treatment apparatus according to another embodiment. FIG. 7 is a cross-sectional view of the water treatment apparatus according to still another embodiment.

Hereinafter, an embodiment of the water treatment apparatus will be described with reference to FIGS. 1 to 5. In each drawing (the same applies to FIGS. 6 and 7), the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratios between the drawings do not necessarily match. Absent.

As shown in FIG. 1, the water treatment apparatus 2 according to the present embodiment is used in the TOC concentration measuring apparatus 1 for measuring the concentration of total organic carbon (TOC). Therefore, prior to explaining each configuration of the water treatment device 2, the TOC concentration measuring device 1 will be described.

The TOC concentration measuring device 1 is connected to the main pipe 10 in order to measure the TOC concentration of water flowing through the main pipe 10. The water flowing through the main pipe 10 is, for example, water for pharmaceuticals used in the production of pharmaceuticals, which has an extremely low TOC concentration. Needless to say, the water measured by the TOC concentration measuring device 1 and the water treated by the water treatment device 2 are not limited to such water.

The TOC concentration measuring device 1 includes a first measuring unit 1a for measuring the conductivity of water, a water treatment device 2 for treating water measured by the first measuring unit 1a, and a conductivity of water treated by the water treatment device 2. It is provided with a second measuring unit 1b for measuring. Then, the TOC concentration measuring device 1 calculates the TOC concentration based on the difference between the conductivity measured by the first measuring unit 1a and the conductivity measured by the second measuring unit 1b.

Further, the TOC concentration measuring device 1 includes a first pipe 1c for connecting the main pipe 10 and the first measuring unit 1a, and a second pipe 1d for connecting the first measuring unit 1a and the water treatment device 2. .. The TOC concentration measuring device 1 includes a third pipe 1e that connects the water treatment device 2 and the second measuring unit 1b, and a fourth pipe 1f that connects the second measuring unit 1b and the main pipe 10. ..

Therefore, the water flowing in from the main pipe 10 flows in the order of the first pipe 1c, the first measuring unit 1a, the second pipe 1d, the water treatment device 2, the third pipe 1e, the second measuring unit 1b, and the fourth pipe 1f. Finally, it returns to the main pipe 10. As a result, the TOC concentration measuring device 1 branches a part of the water flowing through the main pipe 10 to continuously measure the TOC concentration.

As shown in FIG. 2, the water treatment device 2 includes an excimer lamp 3 through which water flows, an inflow section 4 in which water flows into the excimer lamp 3, and an outflow section in which water flowing out from the excimer lamp 3 flows out. It is equipped with 5. Further, the water treatment device 2 includes a device main body 6 for accommodating the excimer lamp 3.

The excimer lamp 3 includes an inner pipe 3a through which water flows inside, and an outer pipe 3b in which the inner pipe 3a is arranged inside and gas is filled between the inner pipe 3a. Then, in the excimer lamp 3, the inner tube 3a and the outer tube 3b are dielectrics, and light is radiated from between the inner tube 3a and the outer tube 3b by the dielectric barrier discharge.

Since the inner tube 3a has translucency, the light radiated between the inner tube 3a and the outer tube 3b passes through the inner tube 3a and irradiates the water flowing inside the inner tube 3a. .. As a result, the organic matter contained in the water flowing inside the inner pipe 3a is decomposed and processed. In the present embodiment, the light emitted from the excimer lamp 3 is ultraviolet light, for example, light having a wavelength of 163.5 nm to 180.5 nm (172 nm ± 8.5 nm). Needless to say, the light emitted from the excimer lamp 3 is not limited to the light having such a wavelength.

The inflow portion 4 is connected to the excimer lamp 3. Specifically, the upstream side of the inflow portion 4 is connected to the second pipe 1d, and the downstream side of the inflow portion 4 is connected to the upstream side of the excimer lamp 3. The inside of the inflow portion 4 communicates with the inside of the inner pipe 3a of the excimer lamp 3. As a result, the water that has flowed inside the inflow portion 4 flows inside the inner pipe 3a of the excimer lamp 3.

The inflow unit 4 includes a turbulent flow generation unit 4a that disturbs the water flowing inside. Then, the turbulent flow generation unit 4a increases the Reynolds number of the water flow by passing the water. Preferably, the turbulent flow generation unit 4a sets the Reynolds number Re of the water flow to the critical Reynolds number (Re = 2320) or more. More preferably, the turbulent flow generating unit 4a sets the Reynolds number Re of the water flow to 3000 or more so that the flow of the passing water becomes a turbulent flow.

For example, the turbulent flow generating portion 4a is formed so that the flow of water is a swirling flow. In the present embodiment, the turbulent flow generating portion 4a includes a protruding portion that protrudes inward in the radial direction from the inner peripheral surface, and the protruding portion extends spirally along the inner peripheral surface.

As a result, the water flowing inside the inflow portion 4 flows inside the inner pipe 3a of the excimer lamp 3 after the Reynolds number of the flow is increased by the turbulent flow generation portion 4a. Therefore, the water flowing inside the inner pipe 3a is uniformly irradiated with the light radiated between the inner pipe 3a and the outer pipe 3b. As a result, the water flowing inside the inner pipe 3a is uniformly treated.

By the way, for example, when the turbulent flow generating portion 4a is arranged inside the inner pipe 3a of the excimer lamp 3, even if the turbulent flow generating portion 4a has translucency, the inner pipe 3a and the outer pipe The light radiated from between 3b is reflected, diffused, or absorbed by the turbulent flow generating portion 4a. Therefore, the treatment efficiency of the water flowing inside the inner pipe 3a is lowered. On the other hand, in the present embodiment, since the turbulent flow generation unit 4a is arranged inside the inflow unit 4, such a decrease in processing efficiency can be prevented.

The turbulent flow generation unit 4a is not limited to such a configuration. For example, the turbulent flow generating portion 4a may have a screw type, a cross fin type, an embossed type protruding from the inner peripheral surface, or a porous body inside. In short, the turbulent flow generation unit 4a may have a configuration in which the Reynolds number of the flow is increased by the passage of water.

Further, the outflow portion 5 is connected to the excimer lamp 3. Specifically, the upstream side of the outflow portion 5 is connected to the downstream side of the excimer lamp 3, and the downstream side of the outflow portion 5 is connected to the third pipe 1e. The inside of the outflow portion 5 communicates with the inside of the inner pipe 3a of the excimer lamp 3. As a result, the water that has flowed inside the inner pipe 3a of the excimer lamp 3 flows inside the outflow portion 5.

As shown in FIGS. 2 and 3, the excimer lamp 3 includes first and second electrodes 3c and 3d in which a voltage is applied between the inner tubes 3a and the outer tube 3b so as to emit light. ing. Further, the excimer lamp 3 includes a reflecting portion 3e that reflects light generated between the inner tube 3a and the outer tube 3b. The reflecting portion 3e is fixed to the inner peripheral surface of the outer tube 3b.

The first and second electrodes 3c and 3d are arranged to face each other so as to interpose the outer tube 3b and the gas. Specifically, the first and second electrodes 3c and 3d are arranged outside the outer tube 3b, respectively, and are arranged facing each other so as to interpose the inner tube 3a and the outer tube 3b. The first and second electrodes 3c and 3d are separated from each other in the circumferential direction so as to insulate each other.

By the way, for example, when the first electrode 3c is arranged outside the outer tube 3b and the second electrode 3d is arranged inside the outer tube 3b (for example, on the outer peripheral portion or the inner peripheral portion of the inner tube 3a). Even if the second electrode 3d has translucency or is formed in a mesh shape (when it is fixed), the light emitted from between the inner tube 3a and the outer tube 3b is the first. It is reflected, diffused, and absorbed by the two electrodes 3d.

Therefore, the treatment efficiency of the water flowing inside the inner pipe 3a is lowered. On the other hand, in the present embodiment, since the first and second electrodes 3c and 3d are arranged outside the outer tube 3b, respectively, such a decrease in processing efficiency can be prevented.

Further, in the direction D1 in which the first and second electrodes 3c and 3d face each other and the direction D2 orthogonal to the axial direction D3 of the inner pipe 3a, the width dimensions W3c and W3d of the first and second electrodes 3c and 3d are It is larger than the outer width dimension W3a of the inner pipe 3a. In the present embodiment, the width dimensions W3c and W3d of the first and second electrodes 3c and 3d are the same.

As a result, as shown in FIG. 4, not only the path L1 in which the dielectric barrier discharge passes through the inner tube 3a but also the path L2 in which the dielectric barrier discharge does not pass through the inner tube 3a exists. Then, the path L2 that does not pass through the inner tube 3a can efficiently radiate light to the path L1 that passes through the inner tube 3a. Therefore, the treatment efficiency of water can be efficiently improved.

As shown in FIG. 5, ultraviolet light is attenuated as it passes through water. FIG. 5 is a graph showing the light intensity attenuation ratio (light intensity attenuation rate) with respect to the distance through which ultraviolet light has passed through water (underwater transmission distance), and the solid line A1 is the data of ultraviolet light having a wavelength of 172 nm. The one-point chain line A2 shows the data of ultraviolet light having a wavelength of 180.5 nm, and the broken line A3 shows the data of ultraviolet light having a wavelength of 163.5 nm.

By the way, in general, in the excima lamp 3 having a peak wavelength of 172 nm, the illuminance of light having a wavelength of 163.5 nm and the illuminance of light having a wavelength of 180.5 nm are about the illuminance of light having a wavelength of 172 nm. It is 50%. Then, in the excimer lamp 3 having a peak wavelength of 172 nm, the permeation distance in water is 1 mm, and the illuminance is attenuated by about 90%.

As a result, the inner diameter of the inner pipe 3a needs to be 1 mm or less in the configuration in which the turbulent flow generating portion 4a is not provided. On the other hand, in the present embodiment, since the turbulent flow generating portion 4a is provided, the inner diameter of the inner pipe 3a can be set to 2 mm or more. As shown in FIG. 5, since it is necessary that the water passing through the inner tube 3a of the excimer lamp 3 is irradiated with light of at least 180.5 nm, the inner diameter of the inner tube 3a is set to 4 mm or less. Is preferable. Needless to say, the inner diameter of the inner tube 3a is not particularly limited.

Based on the above, the water treatment apparatus 2 according to the present embodiment includes an excima lamp 3 through which water flows inside and an inflow portion 4 in which water flows inside and flows into the excima lamp 3. Reference numeral 3 denotes a translucent inner tube 3a through which water flows inside, a dielectric outer tube 3b in which the inner tube 3a is arranged inside and a gas is filled between the inner tube 3a, and the inner tube 3a. The first and second electrodes 3c and 3d are arranged facing each other so as to interpose the outer tube 3b and the gas so as to radiate light from between the tube 3a and the outer tube 3b, and a voltage is applied between them. The inflow unit 4 includes a turbulent flow generation unit 4a that increases the Reynolds number of the flow as water passes through.

According to such a configuration, in the excimer lamp 3, the first and second electrodes 3c and 3d are arranged to face each other so as to interpose the outer tube 3b of the dielectric and the gas, so that the voltage is the second. When applied between the first and second electrodes 3c and 3d, light is emitted from between the inner tube 3a and the outer tube 3b. Then, since the light passes through the inner tube 3a having translucency and irradiates the water flowing inside the inner tube 3a, the water is treated.

By the way, since the inflow unit 4 includes the turbulent flow generation unit 4a, the water flowing inside the inflow unit 4 passes through the turbulent flow generation unit 4a, so that the Reynolds number of the flow increases. Then, since the water in the inflow portion 4 in which the Reynolds number of the flow has increased flows inside the inner pipe 3a of the excimer lamp 3, the water inside the inner pipe 3a is radiated from between the inner pipe 3a and the outer pipe 3b. The light is evenly irradiated.

Moreover, since the turbulent flow generating portion 4a is arranged upstream of the inner pipe 3a, the light radiated between the inner pipe 3a and the outer pipe 3b is used when irradiating the water flowing inside the inner pipe 3a. It is not reflected, diffused, or absorbed by the turbulent flow generating portion 4a. Therefore, the treatment efficiency of water can be improved.

Further, in the water treatment apparatus 2 according to the present embodiment, the first and second electrodes 3c and 3d are respectively arranged outside the outer pipe 3b.

According to such a configuration, since the first and second electrodes 3c and 3d are arranged outside the outer tube 3b, respectively, the region where light is generated between the inner tube 3a and the outer tube 3b and the inner tube It is not placed between the water flowing inside 3a. As a result, the light radiated between the inner tube 3a and the outer tube 3b is reflected, diffused, or absorbed by the first and second electrodes 3c and 3d when irradiating the water flowing inside the inner tube 3a. There is no such thing as. Therefore, the treatment efficiency of water can be further improved.

Further, in the water treatment apparatus 2 according to the present embodiment, the width dimensions W3c and W3d of the first and second electrodes 3c and 3d are the directions D1 and the inside of which the first and second electrodes 3c and 3d face each other. In the direction D2 orthogonal to the axial direction D3 of the pipe 3a, the outer width dimension W3a of the inner pipe 3a is larger than each other.

According to such a configuration, the first and second electrodes are in the direction D2 orthogonal to the direction D1 in which the first and second electrodes 3c and 3d face each other, and in the direction D2 orthogonal to the axial direction D1 of the inner tube 3a. The width dimensions W3c and W3d of 3c and 3d are larger than the outer width dimensions W3a of the inner pipe 3a, respectively. As a result, there is not only a path L1 in which the dielectric barrier discharge passes through the inner tube 3a, but also an efficient path L2 in which the dielectric barrier discharge does not pass through the inner tube 3a.

Therefore, light is efficiently radiated from between the inner tube 3a and the outer tube 3b by the dielectric barrier discharge by the efficient path L2 that does not pass through the inner tube 3a. As a result, the treatment efficiency of water can be efficiently improved.

The water treatment device 2 is not limited to the configuration of the above-described embodiment, and is not limited to the above-mentioned action and effect. In addition, it goes without saying that the water treatment apparatus 2 can be modified in various ways without departing from the gist of the present invention. For example, it goes without saying that one or a plurality of configurations and methods according to the following various modification examples may be arbitrarily selected and adopted for the configurations and methods according to the above-described embodiment.

In the water treatment apparatus 2 according to the above embodiment, the first and second electrodes 3c and 3d are arranged outside the outer pipe 3b, respectively. However, the water treatment apparatus 2 is not limited to such a configuration. For example, as shown in FIGS. 6 and 7, the first electrode 3c may be arranged outside the outer tube 3b, and the second electrode 3d may be arranged inside the outer tube 3b. ..

The second electrode 3d according to FIG. 6 is fixed to the outer peripheral portion of the inner tube 3a, and the second electrode 3d according to FIG. 7 is fixed to the inner peripheral portion of the inner tube 3a. The excimer lamp 3 according to FIG. 7 is provided with a flow pipe 3f arranged inside the second electrode 3d in order to prevent the second electrode 3d from being corroded by water, and the treated water is distributed. It is designed to flow inside the pipe 3f.

Further, in the water treatment apparatus 2 according to the above embodiment, the inner tube 3a of the excimer lamp 3 is a dielectric material. However, the water treatment apparatus 2 is not limited to such a configuration. For example, the inner tube 3a does not have to be a dielectric material. In the excimer lamp 3 according to FIG. 6, the inner tube 3a may or may not be a dielectric, but in the excimer lamp 3 according to FIG. 7, the inner tube 3a is a dielectric. Is.

Further, in the water treatment apparatus 2 according to the above embodiment, the excimer lamp 3 and the inflow portion 4 are separate members. However, the water treatment apparatus 2 is not limited to such a configuration. For example, the portion inside the inflow portion 4 through which water flows and the inner pipe 3a of the excimer lamp 3 may be integrally formed.

Further, in the water treatment apparatus 2 according to the above embodiment, the width dimensions W3c and W3d of the first and second electrodes 3c and 3d are larger than the outer width dimensions W3a of the inner pipe 3a, respectively. However, the water treatment apparatus 2 is not limited to such a configuration. For example, at least one of the width dimensions W3c and W3d of the first and second electrodes 3c and 3d may be smaller than the outer width dimension W3a of the inner pipe 3a, respectively.

1 ... TOC concentration measuring device, 1a ... 1st measuring unit, 1b ... 2nd measuring unit, 1c ... 1st tube, 1d ... 2nd tube, 1e ... 3rd tube, 1f ... 4th tube, 2 ... Water treatment device 3, 3 ... Exima lamp, 3a ... Inner pipe, 3b ... Outer pipe, 3c ... First electrode, 3d ... Second electrode, 3e ... Reflector, 3f ... Flow pipe, 4 ... Inflow part, 4a ... Turbulent flow generation part, 5 ... Outflow part, 6 ... Device body, 10 ... Main pipe

Claims (2)

An excimer lamp with water flowing inside,
It is provided with an inflow portion where water flows inside and flows into the excimer lamp.
The excimer lamp
A translucent inner tube through which water flows,
A dielectric outer tube in which the inner tube is arranged and filled with gas between the inner tube and the inner tube.
The outer tube and the first and second electrodes arranged facing each other so as to interpose the gas and to which a voltage is applied are provided.
The inflow portion includes a turbulent flow generation portion that increases the Reynolds number of the flow through which water passes .
The first and second electrodes, Ru are disposed outside the respective said outer tube, the water treatment apparatus. The width dimension of the first and second electrodes is larger than the outer width dimension of the inner pipe in the direction orthogonal to the direction in which the first and second electrodes face each other and the axial direction of the inner pipe, respectively. The water treatment apparatus according to claim 1.

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