KR102280607B1 - Discharge structure for reducing bublle occurrence using flexible sheet - Google Patents

Abstract

Disclosed is a foam reduction drainage structure, wherein the foam reduction drainage structure according to an embodiment of the present application includes an inlet through which cooling water used in a plant is introduced, and a collecting chamber for collecting cooling water flowing in from the inlet to a predetermined water level, and the A cooling water collecting tank including an overflow wall provided in front of the water collecting room to overflow the cooling water exceeding the predetermined water level from among the cooling water collected in the water collecting room to a downstream side, and a rear end are located on the water surface of the water collecting room, and the front end is located on the wall and a flexible sheet unit having a flexible sheet positioned on the downstream side of the overflow wall, and the coolant flowing through the overflow wall may be drained to the downstream side through between the upper surface of the overflow wall and the lower surface of the flexible sheet.

Description

Foam reduction drainage structure using flexible sheet {DISCHARGE STRUCTURE FOR REDUCING BUBLLE OCCURRENCE USING FLEXIBLE SHEET}

The present application relates to a foam reduction drainage structure using a flexible sheet.

In general, cooling water used in a plant (eg, a power plant) necessarily has a seal pit for holding the siphon of the condenser. These seal pits cause air dragging at the contact point with the air layer due to the potential energy of the nappe generated at the height difference of the structure, and adsorb organic matter in seawater through the process of subdivision and atomization due to turbulence. , it can generate viscous foam that is not easily dissipated due to its strong bonding force.

Due to the occurrence of the above-mentioned viscous bubbles, the bubbles are atomized in the drainage flow, which may decrease drainage performance and design reliability, and increase the buoyancy force of the subsea drainage pipe to cause buoyancy destruction, thereby increasing the construction cost for anchoring, and the final drainage hole A large amount of foam is discharged from the stage to the open sea, which may cause environmental complaints. In addition, if a separate structure to reduce foaming is introduced, excessive construction costs may be required due to an increase in the size of the entire drainage structure.

In order to solve this problem, conventionally, a method of blocking an air inlet point using a rigid structure such as a pipe has been introduced. However, this has a detrimental effect on the structure due to the side effects described above, and brings another problem in that it is difficult to maintain, so there is a limitation in that another solution is required.

The technology that is the background of the present application is disclosed in Korean Patent Publication No. 10-0779022, 'Multi-layered water pipe for reducing bubbles of cooling water in intake and exhaust water of power plant'. This is a water pipe for reducing bubbles generated in the cooling water flowing into the intake pipe or drain pipe when supplying or discharging cooling water to the water intake tank or the open sea through an intake pipe or drain pipe having a pump connected to the outside sea, the intake pipe or The main water pipe and the multi-layered pipe arranged in multiple layers are connected in parallel between the intake tank of the discharge part of the drain pipe or the outer sea, and an auxiliary water storage tank is formed between the inlet of the multi-layer pipe connected to the discharge part of the intake pipe or the drain pipe. there is. In this case, there is a problem in that the construction cost increases due to the installation of the multi-layer pipe and the auxiliary water tank.

The present application is intended to solve the problems of the prior art described above, and an object of the present application is to reduce the occurrence of viscous bubbles by using a flexible sheet to block air entrainment in the process of draining cooling water used in a plant.

The present application aims to solve the problems of the prior art described above, and to provide a foam reduction drainage structure that reduces the occurrence of viscous foam by simple additional construction without changing the existing drainage structure of the plant or by new construction. .

The present application is intended to solve the problems of the prior art described above, and the flow velocity increases in the process of the water vein flowing on an inclined surface or in free fall, so that the cross-sectional area of the fluid is reduced and a flexible sheet that can actively respond to changes in the pressure inside the water vein An object of the present invention is to provide a drainage structure using

However, the technical problems to be achieved by the embodiments of the present application are not limited to the technical problems as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the foam reduction drainage structure according to an embodiment of the present application is formed with an inlet through which the cooling water used in the plant is introduced, and the cooling water introduced from the inlet is collected up to a predetermined water level. A cooling water collecting tank including an overflow wall provided in front of the water collecting chamber and a rear end of the water collecting chamber are located on the water surface of the water collecting chamber so as to overflow the water collecting chamber and the coolant that exceeds the predetermined water level among the coolant collected in the collecting chamber to the downstream side. The front end may include a flexible sheet unit having a flexible sheet located on the downstream side of the overflow wall.

In addition, in the foam reduction drainage structure according to an embodiment of the present application, the coolant flowing through the overflow wall may be drained to the downstream side through between the upper surface of the overflow wall and the lower surface of the flexible sheet.

In addition, the flexible sheet unit includes a floating body arranged to float on the water surface of the water collection chamber and an upper end of the flexible sheet fixed, and rotatable in a winding direction in which the flexible sheet is wound and an unwinding direction in which the flexible sheet is unwound. It may include a roller cartridge installed with respect to the floating body.

In addition, the roller cartridge may be installed with respect to the floating body so as to be located above the water surface of the water collecting chamber.

In addition, the roller cartridge may be installed with respect to the float so that the flexible sheet extends from the rear of the float to the lower side of the float and to the front of the float.

In addition, the flexible sheet may be provided with a length extending so that the lower end thereof is located on the downstream side of the overflow wall.

In addition, the roller cartridge may be installed with respect to the floating body so as to have a rotational friction force smaller than the rotational force in the loosening direction applied while a part of the flexible sheet is in contact with the flow of the coolant flowing through the overflow wall.

In addition, the foam reduction drainage structure according to an embodiment of the present application provides a winding direction rotational driving force greater than the unwinding direction rotational force generated when the lower end of the flexible sheet is located on the downstream side of the overflow wall to the roller cartridge. It may include a driving force providing unit.

In addition, the roller cartridge may be installed to be detachable for replacement.

In addition, the driving force providing unit may be to provide a winding direction rotational driving force to the roller cartridge in order to recover the winding direction of the flexible sheet before detachment for replacement.

In addition, the driving force providing unit may be provided so as to be switchable to any one of a separation state separated from the roller cartridge and a state coupled to the roller cartridge to provide the winding direction rotation driving force to the roller cartridge.

In addition, the flexible sheet unit is positioned spaced apart from the front or rear of the float and is hinge-coupled to a hinge portion and the hinge portion having a lateral direction corresponding to the width direction of the overflow wall as a center axis of rotation, and the float and It may include a rotating member to be connected.

In addition, the hinge part may be located in front of the floating body, and the roller cartridge may be installed on the rear end side of the floating body or on the rear end side of the rotating member.

In addition, the flexible sheet unit may include a reinforcing member installed at the front end of the flexible sheet to reduce flapping of the front end of the flexible sheet.

In addition, the reinforcing member may include a base plate extending in a transverse direction and connected to the front end of the flexible sheet, and a plurality of partition members provided to protrude downward from a lower surface of the base plate and disposed at intervals in the transverse direction. there is.

In addition, the plurality of partition members may be provided such that the downwardly protruding length of the front end is greater than the downwardly protruding length of the rear end.

In addition, the flow rate of the overflow water passing through the lower front end of the base plate may be reduced by the plurality of partition members than the flow rate of the overflow water entering the lower rear end of the base plate.

In addition, the foam reduction drainage structure according to an embodiment of the present application may include a perforated pipe disposed on a bottom area covered by the flexible sheet among the bottom of the downstream side and having a plurality of holes formed around the pipe.

In addition, at least one end of both ends of the perforated pipe may be formed with an inlet through which the foam reduction material is introduced.

In addition, the bubble generation reducing material introduced into the perforated pipe is formed by the cooling water passing between the front surface of the overflow wall and the flexible sheet or between the bottom and the flexible sheet on the downstream side by the pressure difference between the inside and outside of the perforated pipe. It may be naturally discharged through at least some of the plurality of holes.

In addition, the floor area in which the perforated pipe is disposed may be a floor area to which at least a portion of the coolant overflowing the overflow wall through between the upper surface of the overflow wall and the lower surface of the flexible sheet among the floors on the downstream side reaches.

The above-described problem solving means are merely exemplary, and should not be construed as limiting the present application. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and detailed description.

According to the above-described problem solving means of the present application, there is an effect that can reduce the generation of viscous bubbles by blocking air mixing in the process of draining the cooling water used in the plant using the flexible sheet.

According to the above-described problem solving means of the present application, it is possible to flexibly respond to the flow rate of the coolant to be drained and the pressure change applied to the flexible sheet, which is variably changed using the flexible sheet, so that the pressure change or the change in the flow rate increases as the fall distance increases. Even in this case, side effects can be prevented.

According to the above-described problem solving means of the present application, it is possible to remove the causative factor of viscous foam by installing a simple additional construction structure, so there is no need for change or new construction on the existing drainage structure, so additional construction and maintenance are easy It works.

According to the above-described problem solving means of the present application, there is an effect of providing a foam reducing drainage structure with improved buffering effect against a change in the flow rate of the drained cooling water without a decrease in function even with a sudden fluctuation of the flow rate upstream.

According to the above-described problem solving means of the present application, unlike the conventional drainage structure that can be installed only in some areas of the east and south coasts with relatively small drops, foam reduction drainage that can be applied to plants with relatively large drops, for example, power plants in the west coast area There is an effect that a structure is provided.

However, the effects obtainable herein are not limited to the above-described effects, and other effects may exist.

1 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application.
Figure 2 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of Figure 1.
3 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present disclosure including a flexible seat unit provided with a mooring rope, a float and a roller cartridge.
Figure 4 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of Figure 3;
5 is a view showing a reinforcing member installed at the front end of the flexible sheet.
6 is a view showing a state in which the flexible sheet is recovered in the winding direction before detachment for replacement of the roller cartridge.
7 is a conceptual diagram for explaining a hoist for replacing the roller cartridge.
8 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a hinge portion and a float.
Figure 9 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of Figure 8.
10 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present disclosure including a flexible seat unit provided with a float and mooring rope.
Figure 11 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of Figure 10.
12 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a hinge unit.
Figure 13 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of Figure 12.
14 is a conceptual diagram for explaining an intermediate reinforcement installed on the upper surface of the flexible sheet and a baffle pier installed on at least one of an overflow wall or a downstream side of the overflow wall.
15A is a schematic side view of a foam reduction drainage structure according to an embodiment of the present application including a perforated pipe installed for supplying a foam reduction material.
Figure 15b is a plan view from the top of the foam reduction drainage structure according to an embodiment of the present application including a perforated pipe installed for supply of a foam reduction material.
16 is a view showing the simulation results of foam generation according to whether or not the flexible sheet is installed based on the model of the cooling station water tank as an experimental example in connection with the foam reduction drainage structure according to an embodiment of the present application.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present application pertains can easily implement them. However, the present application may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present application in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout this specification, when a part is "connected" with another part, it is not only "directly connected" but also "electrically connected" or "indirectly connected" with another element interposed therebetween. "Including cases where

Throughout this specification, when it is said that a member is positioned "on", "on", "on", "under", "under", or "under" another member, this means that a member is positioned on the other member. It includes not only the case where they are in contact, but also the case where another member exists between two members.

Throughout this specification, when a part "includes" a component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

For reference, in the description of the embodiments of the present application, terms related to a direction or a position (front, rear, lateral direction, vertical direction, etc.) are described based on the arrangement state of each component shown in the drawings. For example, when viewed in FIGS. 2, 4, 6, 7, 9, 11, 13 and 14, the front may be in the 9 o'clock direction, the rear may be in the 3 o'clock direction, and the upper direction may be in the 12 o'clock direction, The downward direction may be in the 6 o'clock direction.

In addition, the cooling water drained from the foam reduction drainage structure according to an embodiment of the present application is introduced from the inlet located inside the cooling water collection tank (for example, the rear of the water collection tank) and flows over the overflow wall located in the front It can be understood that it is drained. there is.

The plant to which the foam reduction drainage structure 10 of the present application is applied is a generic term for production facilities in which various mechanical devices and facilities are installed to produce raw materials, intermediate goods, final products, electric power, petroleum gas, fresh water, etc. targeted by the producer. can be understood in a broad sense. For example, a petrochemical plant, a pharmaceutical plant, an oil refinery plant, a power plant, a thermal power plant, a hydroelectric power plant, a nuclear power plant, a cogeneration plant, a tidal power plant, etc. may correspond to this, but are not limited thereto. Illustratively, the foam reduction drainage structure 10 of the present application may be applied to a plant drainage structure using seawater as a cooling water.

In addition, the term "width direction" used throughout the present specification may mean a direction pointing to a transverse direction or a horizontal direction orthogonal to the aforementioned front-rear direction, depending on the arrangement state of the present structure. However, this direction setting may vary depending on the arrangement state of the foam reduction drainage structure of the present application.

1 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application, and FIG. 2 is a schematic side view for explaining the inside of the foam reduction drainage structure according to an embodiment of the present application of FIG.

1 and 2 , the foam reduction drainage structure 10 according to an embodiment of the present disclosure may include a cooling water collecting tank 200 and a flexible seat unit 100 .

The cooling water collecting tank 200 may include a water collecting chamber 210 in which an inlet 230 (outlet) through which the cooling water used in the plant is introduced is formed, and the cooling water flowing in from the inlet 230 is collected up to a predetermined water level. Here, the predetermined water level may be set to a water level that induces high and low potential energy for discharging cooling water from the plant drainage structure. For example, the predetermined water level may be set through the height of the rear surface of the overflow wall 220 to be described later. Exemplarily, one or more water collecting chambers 210 may be provided, and in this case, the inlet 230 may be formed in the same number as the water collecting chamber 210 . When a plurality of water collecting chambers 210 are provided, these water collecting chambers 210 may be arranged in parallel along the lateral direction.

In addition, the cooling water collecting tank 200 is provided in front of the water collecting chamber 210 so as to overflow the cooling water exceeding the predetermined water level among the cooling water collected in the water collecting chamber 210 to the downstream side 240 . may include. Illustratively, referring to FIGS. 1 and 2 , the wall surface (front) of the front side of the overflow wall 220 is formed as an inclined surface, and the wall surface (rear) of the rear side is formed as a vertical surface parallel to the vertical direction. The present invention is not limited thereto.

For example, the cooling water collecting tank 200 may be a seal pit type structure in which cooling water used in a plant is introduced and collected.

The flexible sheet unit 100 may include a flexible sheet 110 having a rear end positioned on the water surface of the water collecting chamber 210 and a front end positioned on the downstream side 240 of the overflow wall 220 .

The flexible sheet unit 100 has a configuration in which the flexible sheet 110 and the flexible sheet 110 correspond to the variable water surface of the water collecting chamber 210 , and the flexible sheet 110 is in close contact with the water surface of the water collecting chamber 210 . It may mean a mechanism, assembly, etc. including a configuration (for example, a floating body, mooring rope, etc. to be described later), a reinforcing member that corrects excessive deformation of the flexible sheet 110 in the lateral direction, etc. , A detailed configuration that may be provided in the flexible sheet unit 100 will be described later.

The flexible sheet 110 may be made of a flexible material to respond to various flow velocity changes of the coolant flowing through the overflow wall 220 . Illustratively, the flexible sheet 110 may be made of a rubber plate, a vinyl film, a film material, a fabric, or the like.

A rigid structure such as a pipe applied to a conventional drainage structure is difficult to manufacture with a variable cross-section whose cross-section can be continuously changed, and there is a limit in that it cannot respond flexibly to a change in pressure applied to the rigid structure. On the other hand, the flexible sheet 110 provided in the foam reduction drainage structure 10 of the present application is a flexible sheet that can be bent and deformed in response to a pressure change applied thereto, and is applied to the flow rate change of the coolant and the flexible sheet 110 . It is installed so that it can respond flexibly to changes in pressure, so that local negative pressure and cavitation can be prevented.

The coolant flowing through the overflow wall 220 may be drained to the downstream side 240 through between the upper surface of the overflow wall 220 and the lower surface of the flexible sheet 110 .

In addition, the flexible sheet 110 may be provided with a length extending so that the lower end thereof is located on the downstream side 240 of the overflow wall (220). 1 and 2 , the flexible sheet 110 may be provided such that the lower end thereof extends beyond the front inclined surface (front) of the overflow wall 220 and onto the downstream side 240 having a flat bottom surface.

With respect to the length of the flexible sheet 110, when the lower end of the flexible sheet 110 is provided with a length extending to be located on the downstream side of the overflow wall 220, on the front side inclined surface 220a of the overflow wall 220 An air access blocking passage through which the coolant overflowing beyond the overflow wall 220 may pass may be formed between the lower side of the flexible sheet 110 and the upper side of the bottom of the downstream side 240 of the overflow wall. At this time, the passage between the lower side of the flexible sheet 110 and the upper side of the bottom side of the downstream side 240 of the overflow wall may be relatively low pressure due to the fast flow rate, which causes the lower end of the flexible sheet 110 to be the overflow wall. Since it is not exposed on the downstream water surface from the downstream side 240 of the , and can be located in the water with an appropriate pressing pressure applied, the generation of bubbles due to the inflow of air can be more effectively blocked.

In addition, when air flows into the lower side of the flexible sheet 110 from the upper end side of the flexible sheet 110 (for example, near the water surface of the water collecting room), the subdivision or atomization may proceed by a high flow rate from the lower side of the flexible sheet 110, The flexible sheet 110 is preferably installed so that its upper end (rear end) is in close contact with the water surface of the water collecting chamber 210 in order to block air mixing. Since the water level (water level or level) of the coolant collected in the water collecting chamber 210 fluctuates depending on the amount of coolant flowing in, the flexible sheet 110 responds to the change in the water level of the coolant collected in the water collecting chamber 210. The flexible sheet ( 110 ) may be provided in a form connected to a configuration that functions to be in contact with the water surface of the water collecting chamber 210 .

In this regard, the flexible seat unit 100 may include a floating body 120 disposed to float on the water surface of the water collecting chamber 210 . Referring to FIG. 1 , the floating body 120 may be formed in a downwardly convex shape. Exemplarily, the shape of the lower surface of the downwardly convex floating body 120 may be a convex streamline curved surface shape, a convex arc-shaped curved surface shape having a predetermined radius of curvature, or an elliptical curved surface shape, but is not limited thereto. In addition, the floating body 120 may be provided in a form extending along the transverse direction corresponding to the width direction of the overflow wall (220). In order to reduce the generation of bubbles for the overflowing coolant, it may be preferable that the horizontal extension length of the floating body 120 is set as much as the width through which the coolant overflows of the overflow wall 220 or by a width close to the width. there is. Also, as another example, a plurality of floats 120 may be provided to be arranged side by side at intervals along the lateral direction.

In addition, referring to FIGS. 1 and 2 , at least a portion between the lower end (front end) and the upper end (rear end) of the flexible sheet 110 is provided with one or more intermediate reinforcing materials 180 to prevent the flexible sheet 110 from being deformed. can In the case of the foam reduction drainage structure 10 having the cooling water collection tank 200 having a relatively large area or volume, the flexible sheet 110 should have a wide width in the width direction, a long length in the front and rear directions, and overflow of the coolant (In other words, as the flexible sheet 110 is deformed in the process (in other words, falling over the overflow wall), air may be introduced through one side or the other side in the width direction of the flexible sheet 110, so the intermediate reinforcement 180 prevents this. may be provided for. Illustratively, the intermediate reinforcing material 180 may be installed on the upper surface (the upper surface between the front and rear ends) of the flexible sheet 110 in a form extending in the lateral direction. In addition, the intermediate reinforcing material 180 may be provided in the form of a bar or a bar, but is not limited thereto.

Through the intermediate reinforcing material 180 extending in the transverse direction, the flexible sheet 110 can be prevented from bending or twisting in the other direction while allowing bending deformation in the lateral direction as an axis, so that the flexible sheet It is possible to form an efficient structure in which 110 is flexible and selectively allows bending deformation in a desired direction.

In addition, the flexible sheet unit 100 may include a reinforcing member 170 installed at the front end of the flexible sheet 110 to reduce flapping of the front end of the flexible sheet 110 .

A detailed description of the reinforcing member 170 will be described later with reference to FIG. 5 .

In addition, the flexible sheet unit 100 is spaced apart from the front or rear than the floating body 120 and a hinge part 150 and a hinge part having a lateral direction corresponding to the width direction of the overflow wall 220 as a rotational center axis ( It may include a rotating member 160 that is hinged to 150 and connected to the floating body 120 .

That is, the upper end of the flexible sheet 100 is installed rotatably with a hinge from above the overflow wall 220 to help the cooling water collected in the water collecting chamber 210 adhere to the water surface, so that the water level of the water collecting chamber 210 fluctuates. It may be connected to the rotating member 160 that rotates according to the .

In addition, the hinge part 150 may be located in front of the floating body 120 .

The rotating member 160 may be provided, for example, in a plate shape coupled to the hinge unit 150 and connected to the floating body 120 . As another example, the rotating member 160 is coupled to the hinge unit 150 at one end in the width direction and the other end in the width direction of the hinge unit 150 , respectively, connected to the floating body 120 , and is a pair of extending in the front-rear direction. It may be provided in a bar or bar shape.

In addition, the flexible sheet unit 100 may include a roller cartridge 130 .

The upper end of the flexible sheet 110 may be fixed to the roller cartridge 130 . For example, the upper end of the flexible sheet 110 may be connected by bonding or fixed to the roller cartridge 130 by a separate fixing means such as screws or bolts.

In addition, the roller cartridge 130 may be installed with respect to the floating body 120 rotatably in a winding direction in which the flexible sheet 110 is wound and in an unwinding direction in which the flexible sheet 110 is unwound.

In addition, the roller cartridge 130 may be installed with respect to the floating body 120 so as to be located above the water surface of the water collecting chamber 210 . Illustratively, the roller cartridge 130 may be directly installed with respect to the floating body 120 by being installed on the rear end side of the floating body (120). As another example, the roller cartridge 130 may be installed indirectly with respect to the floating body 120 by being installed on the rear end side of the rotating member 160. Throughout this specification, the rotational directions of the winding direction and the unwinding direction are referred to. The expression terms may refer to a counterclockwise direction (direction A of FIG. 6 ) and a clockwise direction (direction B based on FIG. 6 ), respectively, based on the arrangement state shown in FIG. 6 , which will be described later.

In addition, the winding direction and the unwinding direction may be understood as, for example, a direction in which the flexible sheet 110 is wound on the roller cartridge 130 and a direction in which it is unwinding. In other words, winding the flexible sheet 110 on the roller cartridge 130 means winding, and unwinding the flexible sheet 110 of the roller cartridge 130 may mean unwinding. .

In addition, the roller cartridge 130 is to be installed with respect to the floating body 120 so that the flexible sheet 110 extends from the rear of the floating body 120 through the lower side of the floating body 120 to the front of the floating body 120 . can The flexible sheet 110 is installed so as to extend forward from the rear of the floating body 120 past the lower side of the floating body 120 so that the floating body 120 presses the flexible sheet 110 extending forward in the downward direction. In addition, it is possible to prevent the departure of the flexible sheet 110 in the upward direction.

In addition, the roller cartridge 130 is to be installed with respect to the floating body 120 so as to have a rotational friction force smaller than the rotational force in the loosening direction that is applied while a part of the flexible sheet 110 comes into contact with the flow of the coolant flowing through the overflow wall 220 . can

The rotational friction force may mean frictional resistance acting in the winding direction to prevent the flexible sheet 110 wound around the roller cartridge 130 from being unwound in the unwinding direction. In addition, the rotational friction force may be determined differently depending on the material of the flexible sheet 110 , the spacing between the flexible sheets 110 wound around the roller cartridge 130 , and the like.

Therefore, if the roller cartridge 130 is provided to have a rotational friction force greater than the rotational force in the loosening direction applied while a part of the flexible sheet 110 is in contact with the overflowing flow of coolant, the flexible sheet 110 is partially in contact with the flow of the coolant. Even if it comes into contact, it is no longer loosened in the loosening direction.

On the other hand, since the roller cartridge 130 is provided to have a rotational friction force smaller than the rotational force in the unwinding direction, the flexible sheet 110 wound around the roller cartridge 130 has a predetermined length so that a part thereof is in contact with the overflowing coolant flow. When the flexible sheet 110 is moved forward by the flow of the overflowing coolant, rotational force in the unwinding direction is transmitted to the roller cartridge 130 in the unwinding direction, and the flexible sheet 110 from the roller cartridge 130 when it is unwound in the unwinding direction. can be unwound in the unwinding direction by its entire length.

Accordingly, the rear end of the flexible sheet 110 is located on the water surface of the water collecting chamber 210 and the front end is located on the water surface of the water collecting chamber 210 according to the flow of the overflowing coolant without providing a separate driving force for unwinding the flexible sheet 110 wound around the roller cartridge 130 . It may be located on the downstream side 240 of the overflow wall.

In addition, the roller cartridge 130 may be installed to be detachable for replacement. The replacement cycle of the roller cartridge 130 may be determined according to the material of the flexible sheet 110 . For example, the flexible sheet 110 made of rubber may be installed permanently or semi-permanently.

In addition, the foam reduction drainage structure 10 according to an embodiment of the present application has a winding direction greater than the loosening direction rotational force generated in a state where the lower end of the flexible sheet 110 is located on the downstream side 240 of the overflow wall 220 . It may include a driving force providing unit 140 for providing a rotational driving force to the roller cartridge 130 .

In addition, the driving force providing unit 140 may provide a winding direction rotational driving force to the roller cartridge 130 in order to recover the winding direction of the flexible sheet 110 before removal for replacement of the roller cartridge 130 .

The state in which the lower end of the flexible sheet 110 is located on the downstream side 240 of the overflow wall may mean a state in which the flexible sheet 110 is completely released from the roller cartridge 130 by its entire length.

The rotational force in the release direction generated when the lower end of the flexible sheet 110 is positioned on the downstream side 240 of the overflow wall is a force acting to rotate the roller cartridge 130 in the release direction by the flow of the overflowing coolant. can mean Conversely, the winding direction rotational driving force may refer to a force transmitted by the driving force providing unit 140 to rotate the roller cartridge 130 in the winding direction.

In order to replace the flexible sheet 110 in a state where the entire length is released from the roller cartridge 130 by the flow of coolant and the front end is located on the downstream side 240 of the overflow wall, the flexible sheet 110 is recovered in the winding direction ( Winding). At this time, in order for the flexible sheet 110 to be recovered, the driving force providing unit 140 is applied to the flexible sheet 110 by the flow of coolant overflowing in the state where the flexible sheet 110 is located on the downstream side 240 of the overflow wall. A winding-direction rotational driving force greater than the applied unwinding-direction rotational force shall be provided.

For example, the driving force providing unit 140 may include a rotation driving motor. In addition, the roller cartridge 130 may be rotated by the rotation driving motor.

Also, illustratively, the driving force providing unit 140 may include a rotational driving motor capable of two-way driving involved in both the unwinding direction rotation and the winding direction rotation of the roller cartridge 130 .

For example, the driving force providing unit 140 including a rotational driving motor capable of two-way driving rotates in the winding direction on the roller cartridge 130 to recover the winding direction of the flexible sheet 110 before removal for replacement of the roller cartridge. The flexible sheet 110 in the flow of the coolant overflowing the overflow wall 220 by unwinding the flexible sheet 110 wound on the newly supplied roller cartridge 130 to provide a driving force or to be replaced with a new roller cartridge 130 in the unwinding direction. ) may provide a rotational driving force in the loosening direction so that a part of the contact is made.

In addition, the driving force providing unit 140 may be provided so as to be switchable to any one of a state in which the rotational driving force in the winding direction is provided and a state in which the rotational driving force in the unwinding direction is provided.

In addition, the driving force providing unit 140 can be switched to any one of a separated state separated from the roller cartridge 130 and a state coupled with the roller cartridge 130 to provide a winding direction rotational driving force to the roller cartridge 130 . can be provided.

In addition, according to an embodiment, the driving force providing unit 140 may be fixedly installed with respect to the roller cartridge 130 .

3 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a mooring rope, a float and a roller cartridge, and FIG. It is a schematic side view for explaining the inside of the foam reduction drainage structure.

Referring to FIGS. 3 and 4 , the floating body 120 may be provided to be positioned by floating on the water surface of the water collecting chamber 210 by the mooring rope 111 .

For example, the floating body 120 has a front end connected to the floating body 120 and a rear end thereof floating on the water surface of the water collecting room 210 by a mooring rope 111 fixed to a part of the rear inner wall of the water collecting room so that it is positioned. can be provided.

At this time, by the mooring rope 111 , the floating body 120 moves the water surface of the water collecting chamber 210 by the flow of the coolant drained from the water collecting chamber 210 to the downstream side 240 over the overflow wall 220 . departure can be prevented.

The length of the mooring rope 111 is such that the flow rate of the drained cooling water is high so that the floating body 120 connected to the front end of the mooring rope 111 floats on the water surface of the water collecting chamber 210 in a state where the mooring rope 111 is taut. It is preferable to set the length to be positioned.

In addition, the vertical height of a portion of the inner wall of the rear side of the water collecting chamber 210 to which the rear end of the mooring rope 111 is fixed may be determined in consideration of the general level fluctuation of the coolant collected in the water collecting chamber 210 .

According to the embodiment, the mooring rope 111 may be provided in at least one number.

5 is a view showing a reinforcing member installed at the front end of the flexible sheet.

Referring to FIG. 5 , the flexible sheet unit 100 may include a reinforcing member 170 installed at the front end of the flexible sheet 110 to reduce flapping of the front end of the flexible sheet 110 . The reinforcing member 170 may include a base plate 171 extending in the transverse direction and connected to the front end of the flexible sheet 110 .

In addition, it is possible to prevent the flexible sheet 110 from being deformed in the transverse direction by the base plate 171 extending in the transverse direction.

In addition, the reinforcing member 170 may include a plurality of partition members 172 that are provided to protrude downward from the lower surface of the base plate 171 and are spaced apart from each other in the lateral direction.

In addition, the plurality of partition members 172 may be provided such that the downward protrusion length of the front end is greater than the downward protrusion length of the rear end.

In addition, by the plurality of partition members 172, the flow _{rate (V 2} ) of overflow water passing through the lower front end of the base plate 171 than _{the flow rate (V 1 ) of the overflow water entering the lower rear end of the base plate 171 (V 2 )} can be reduced. (V ₁ >V ₂ )

Specifically, the flow cross-sectional area of the coolant passing through the lower side of the reinforcing member 170 at the front end of the flexible sheet 110 is a plurality of partition members 172 provided such that the downward protrusion length of the front end is greater than the downward protrusion length of the rear end. It can become wider as it goes forward.

In addition, as the flow cross-sectional area is widened toward the front by the plurality of partition members 172 , the flow rate of overflow water is reduced, and the pressure of the coolant flow after passing through the reinforcing member 170 may increase.

That is, as the plurality of partition members 172 are provided so that the downward protrusion length of the front end is greater than the downward protrusion length of the rear end, the pressure difference of the coolant flow before passing through the reinforcing member 170 and after passing through the reinforcing member 170 . The flow of cooling water growing and passing between the lower side of the flexible sheet 110 and the bottom of the downstream side 240 of the overflow wall can form a low pressure close to a vacuum.

Accordingly, the front end of the flexible sheet 110 may be located in the water with a pressing pressure applied from the upper direction to the lower direction, so that the flap of the front end of the flexible sheet 110 may be reduced.

In addition, the plurality of partition members 172 may be disposed at intervals in the transverse direction to function as a partition. Accordingly, the plurality of partition members 172 may prevent the occurrence of irregular vortices of the coolant flow passing through the front end of the flexible sheet 110 . Accordingly, the generation of a vortex (or turbulence) according to the flow of the coolant is prevented, so that the fluttering caused by the vortex (or turbulence) at the front end of the flexible sheet 110 can be reduced.

6 is a view showing a state in which the flexible sheet is recovered in the winding direction before detachment for replacement of the roller cartridge.

Referring to FIG. 6 , the flexible sheet 110 provides a driving force in the winding direction (direction A) to the roller cartridge 130 by the driving force providing unit 140 to rotate the roller cartridge 130 in the winding direction, thereby rotating the roller cartridge. 130 may be recovered for replacement.

Also, referring to FIG. 6 , the roller cartridge 130 that has been collected may be detached from the rotating member 160 for replacement of the roller cartridge 130 .

7 is a view showing a hoist for replacing the roller cartridge.

Referring to FIG. 7 , the foam reduction drainage structure 10 according to an embodiment of the present application may include a hoist 300 for replacing the roller cartridge 130 .

The hoist 300 can be mounted or detached from the roller cartridge 130, and the new roller cartridge 130 is transferred to the floating body 120 or the rotating member 160, or a flexible sheet ( 110 ) may include a replacement unit 310 for recovering the roller cartridge 130 recovered in the winding direction from the floating body 120 or the rotating member 160 .

In addition, the hoist 300 is provided with a connecting member 311 coupled to the replacement unit 310, and the lifting unit 320 and the lifting unit 320 for elevating the replacement unit 310 are connected and the lifting unit 320. It may include a body portion 330 for supporting the.

In addition, the replacement unit 310 may include a configuration that provides a rotational force in the unwinding direction so that the flexible sheet 110 wound around the roller cartridge 130 in the winding direction is unwound by a predetermined length or more. In addition, the replacement unit 310 is a roller cartridge for recovering the winding direction of the flexible sheet 110 before detachment for replacement of the roller cartridge 130 in a state where the flexible sheet 110 is located on the downstream side 240 of the overflow wall. It may include a configuration for providing a winding direction rotational force (130).

In addition, the flexible seat unit 100 and the working scaffold 340 adjacent to the rear may be formed in at least a portion of the water collecting chamber 210 .

The working scaffold 340 is an exemplary replacement of the roller cartridge 130 , at least a portion of the flexible sheet 110 wound around the roller cartridge 130 , and a part of the flexible sheet 110 is collected in the water collection chamber 210 . It may be a structure provided so that the operator can step in the process of unwinding in the unwinding direction so as to be in contact with the coolant flow, and installing or detaching the replacement unit 310 and the roller cartridge 130 of the hoist 300 .

For example, the working scaffold 340 may be a structure connected between a part of the inner wall of one side in the transverse direction and a part of the inner wall of the other side in the transverse direction of the water collecting chamber 210 . As another example, the work scaffold 340 may be connected to the rear end side wall of the water collection chamber through a separate connection member and may be provided to rise or fall according to a change in the water level of the water collection chamber 210 , but is not limited thereto.

8 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a hinge unit and a floating body, and FIG. 9 is a foam reduction drainage structure according to an embodiment of the present application of FIG. It is a schematic side view for explaining the interior of the

8 and 9 , the flexible sheet unit 100 of the foam reduction drainage structure 10 according to an embodiment of the present application includes the above-described floating body 120 , the hinge unit 150 and the rotating member 160 . may include.

In addition, the flexible sheet 110 may be installed with respect to the float 120 so as to extend from the rear of the float 120 past the lower side of the float 120 to the front of the float 120 .

10 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a floating body and a mooring rope, and FIG. 11 is a foam reduction drainage according to an embodiment of the present application in FIG. It is a schematic side view for explaining the inside of the structure.

10 and 11 , the flexible sheet 110 has a rear end connected to at least a part of the front end side of the floating body 120 on the water surface of the water collecting chamber 210 and the front end is on the downstream side 240 of the overflow wall. It can be installed to be located in

12 is a schematic perspective view of a foam reduction drainage structure according to an embodiment of the present application including a flexible seat unit provided with a hinge portion, and FIG. 13 is a view of the inside of the foam reduction drainage structure according to an embodiment of the present application of FIG. It is a schematic side view for explanation.

12 and 13 , the flexible seat unit 100 may include the above-described hinge unit 150 and the rotating member 160 .

In addition, the rotating member 160 may include a load transmitting member 161 at a position spaced apart from the hinge unit 150 by a predetermined distance so as to be able to rotate in response to the fluctuation of the water level in the water collection chamber 210 . .

Referring to FIG. 12 , the load transfer member 161 may have a bar or bar shape extending in the transverse direction, but is not limited thereto.

14 is a view showing an intermediate reinforcement installed on the upper surface of the flexible sheet and a baffle pier installed on at least one of an overflow wall or a downstream side of the overflow wall.

Referring to FIG. 14 , excessive deformation in the lateral direction of the flexible sheet 110 may be corrected by the intermediate reinforcing material 180 . In addition, referring to FIG. 14 , the flow rate of the downstream side 240 of the overflow wall is slowed by the baffle pier 190 , so that excessive flapping of the flexible sheet 110 can be prevented.

For example, one or more baffle piers 190 may be installed at the bottom of the downstream side 240 of the cooling water collection tank. As another example, one or more baffle piers 190 may be installed above the front side inclined surface 220a of the overflow wall 220 .

In addition, one or more intermediate reinforcing materials 180 may be installed on the upper surface of the flexible sheet 110 in a form extending in the transverse direction.

The intermediate reinforcing material 180 and the baffle pierce 190 may have a bar or bar shape extending in the transverse direction, but are not limited thereto and may have various shapes according to embodiments.

15A is a schematic side view of a foam reduction drainage structure according to an embodiment of the present application including a perforated pipe installed for supply of a foam reducing material, and FIG. 15B is a perforated tube installed for supplying a foaming reducing material. It is a plan view viewed from the top of the foam reduction drainage structure according to an embodiment of the present application.

15A and 15B, the flexible sheet 110 of the foam reduction drainage structure 10 according to an embodiment of the present application is extended so that its lower end is located on the downstream side 240 of the overflow wall 220 length may be provided. In addition, the foam reduction drainage structure 10 according to an embodiment of the present application is disposed on the floor area covered by the flexible sheet 110 of the bottom of the downstream side 240 and has a plurality of holes 251 around the tube. It may include the formed perforated tube 250 .

Here, the bottom region in which the perforated pipe 250 is disposed is at least one of the coolant flowing through the overflow wall 220 through between the upper surface of the overflow wall 220 and the lower surface of the flexible sheet 110 among the bottoms of the downstream side 240 . It can mean the floor area that some reach.

In addition, referring to FIGS. 15A and 15B , the plurality of holes 251 are formed on the front side of the perforated pipe 250 so that the foam reduction material naturally discharged through at least some of the plurality of holes 251 flows toward the front. may be formed, but is not limited thereto. That is, it may be variously formed in a predetermined area around the tube of the perforated tube 250 including the rear side, the upper side, the lower side of the perforated tube 250 .

Also, intervals between the plurality of holes 251 may be formed at equal intervals with reference to FIGS. 15A and 15B , but is not limited thereto. For example, the spacing between the plurality of holes 251 may be determined at various intervals in consideration of the cooling water drainage characteristic or the structural characteristic of the floor area in which the perforated pipe 250 is installed.

In addition, at least one end of both ends of the perforated pipe 250 may be formed with inlets 252 and 253 through which the foam reduction material is introduced.

In addition, referring to Fig. 15b, the foaming reducing material can be introduced in both directions (from the upper side to the lower side and from the lower side to the upper side based on Fig. 15b) through both ends 252 and 253 of the perforated pipe. The present invention is not limited thereto. As another example, the foam reduction material may be introduced through the inlet 252 formed at one end of both ends, and in this case, the other end of the perforated pipe 250 may be provided in a closed (dead end) shape. As another example, the foam reduction material may be introduced through the inlet 253 formed at the other end of both ends, and in this case, one end of the perforated pipe 250 may be provided in a closed (dead end) shape.

Here, the foaming reducing material may be an antifoaming agent, but is not limited thereto. For example, the foam-reducing material includes various chemicals such as chemicals and gases that function to suppress the formation of viscous bubbles that may be formed according to the drainage of cooling water or to remove the viscous bubbles that have already occurred. can do.

In addition, the perforated pipe 250 may be disposed to extend in parallel with the width direction on the floor area, but is not limited thereto. That is, the perforated pipe 250 may be disposed to cross at least a part of the bottom of the downstream side 240 in the transverse direction. For example, the perforated pipe 250 may be disposed in a longitudinally extending form in a direction parallel to the transverse direction of the overflow wall 240 . As another example, a portion of the perforated tube 250 may extend in parallel with the width direction on the floor area, and the remainder of the perforated tube 250 may be disposed on the floor area in a form extending in the horizontal direction and parallel to the floor area.

Referring to FIG. 15B , the aforementioned width direction may be understood to indicate a 12 o’clock-6 o’clock direction with reference to FIG. 15B , and the aforementioned lateral direction may be understood to indicate a 9 o’clock-3 o’clock direction based on FIG. 15B . can be

Hereinafter, the process in which the foaming reducing material introduced into the perforated pipe 250 is discharged through at least some of the plurality of holes 251 and the cooling water through which the foaming material discharged through at least some of the plurality of holes 251 is drained Describe the process of mixing with

First, with respect to the process in which the foaming reducing material is discharged, the foaming reducing material introduced into the perforated pipe 250 is between the front of the overflow wall 220 and the flexible sheet 110 or the bottom of the downstream side 240 and Due to the pressure difference between the inside and outside of the perforated pipe 250 formed by the cooling water passing between the flexible sheets 110 , it may be naturally discharged through at least some of the plurality of holes 251 .

Specifically, the perforated pipe 250 may be disposed in a low pressure region where a low pressure is formed by the coolant discharged to the downstream side of the bottom of the downstream side 240 . Illustratively, the perforated pipe 250 may be disposed at least partially in contact with the front surface of the overflow wall 240 , but is not limited thereto. As another example, the perforated pipe 250 may be disposed to be spaced apart forward by a predetermined distance from the front surface of the overflow wall 220 .

That is, in the low pressure region where the perforated pipe 250 is installed, the coolant flowing through the overflow wall 220 is between the upper surface of the overflow wall 220 and the lower surface of the flexible sheet 110 or the bottom of the downstream side 240 and the flexible sheet In a narrow gap between the upper surface of the overflow wall 220 or the bottom of the downstream side 240 through which the coolant passes in the process of being drained to the downstream side 240 through between the lower surfaces of the 110 and the lower surface of the flexible sheet 110 Accordingly, the flow rate of the cooling water may be increased by a predetermined level or more, and as the flow rate increases, the pressure (water pressure) of the cooling water may become relatively low compared to the pressure inside the perforated pipe 250 through which the foam reduction material flows.

Accordingly, the foam reduction drainage structure 10 provided with the perforated pipe 250 according to an embodiment of the present application is a spray device, a spray member, a motor, a nozzle, a power supply device, etc. According to the pressure difference (in other words, suction pressure) inside and outside the perforated pipe 250 (in other words, suction pressure) formed by the drain flow of the cooling water, the material to reduce generation naturally goes out of the perforated pipe 250 through the plurality of holes 251 (toward the downstream side) can be emitted.

Next, in relation to the process in which the foaming reducing material discharged through at least some of the plurality of holes 251 is mixed with the cooling water, the perforated pipe 250 overflows the overflow wall 220 of the bottom of the downstream side 240 . It may be disposed within a turbulence region where turbulence is formed in one coolant, or may be disposed rearwardly adjacent to the turbulence region. For example, the turbulence region may be a region adjacent (adjacent) to the front surface of the overflow wall 220 . Since such a turbulence region formed downstream of the overflow wall will be obvious to those skilled in the art, a more detailed description will be omitted.

That is, in the turbulence region in which the perforated pipe 250 is installed, the cooling water drained by overflowing the overflow wall 220 is merged into the downstream side 240 by turbulence (turbulence), a plurality of holes 251 . The foam reduction material discharged to the outside (downstream) of the perforated pipe 250 through at least a portion of the can be mixed (stirred) into the drained cooling water at a high speed without the installation of a separate mixing facility. That is, the concentration of the bubble generation reducing material discharged from the perforated tube 250 due to turbulence (turbulence) occurring in the turbulence region may be uniformly rapidly in the cooling water.

Taken together, the inventor of the present application arranges a perforated tube for introducing and discharging a bubble generation reduction material in connection with this turbulence area and the aforementioned low pressure area, so that the bubble naturally discharged from the perforated tube 250 due to the pressure difference inside and out of the perforated tube 250 The organic action can be made in the form of natural mixing of the generation reducing material by turbulence, so that more uniform mixing of the foam generation reducing material with the cooling water can be effectively achieved without a separate mixing device.

For reference, in the above description, the low-pressure region or the turbulence region may partially overlap with each other according to embodiments. In this regard, the bottom area in which the perforated pipe 250 of the bubble reduction drainage structure 10 according to an embodiment of the present application is disposed, based on the low pressure area and the turbulence area, the perforated pipe 250 is generated by the pressure difference inside and outside It can be determined as an area in which the abatement material is easily discharged, and the discharged foam generating material is easily mixed with the cooling water.

16 is a view showing the simulation results of foam generation according to whether or not the flexible sheet is installed based on the model of the cooling station water tank as an experimental example in connection with the foam reduction drainage structure according to an embodiment of the present application.

Referring to FIG. 16 , a separating wall that separates the model of the cooling water collection tank of the present application into two spaces may be installed, and a structure such as the flexible sheet of the present application is installed in an area (B) of the separated space, and the separated space By not installing a structure such as a flexible sheet in the other area (A) of the space, it is possible to compare the degree of bubble generation in the two separated spaces.

Referring to FIG. 16 , it can be seen that much less viscous bubbles are generated in the region (B) in which a structure such as a flexible sheet is installed than in the region (A) in which a structure such as a flexible sheet is not installed. It is possible to infer the special foam reduction effect of the foam reduction drainage structure 10 according to the

The above description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

10: Foam reduction drainage structure
100: flexible seat unit
110: flexible sheet
111: mooring rope
120: floating body
130: roller cartridge
140: driving force providing unit
150: hinge
160: rotating member
161: load transfer member
170: reinforcing member
171: base plate
172: partition member
180: intermediate reinforcement
190: baffle pier
200: cooling water sump
210: catchment room
220: overflow wall
230: inlet
240: downstream
250: perforated tube
251: Hall
300: hoist
310: replacement unit
311: connecting member
320: elevating unit
330: body portion
340: work scaffold

Claims (14)

In the foam reduction drainage structure,
An inlet through which the cooling water used in the plant is introduced is formed, and a water collecting room that collects the cooling water flowing in from the inlet up to a predetermined water level, and the cooling water that exceeds the predetermined water level among the cooling water collected in the water collecting chamber overflows downstream. a cooling water collecting tank including an overflow wall provided in front of the water collecting chamber; and
a flexible sheet unit having a flexible sheet having a rear end on the water surface of the water collecting chamber and a front end on a downstream side of the overflow wall,
The coolant flowing through the overflow wall is drained to the downstream side through between the upper surface of the overflow wall and the lower surface of the flexible sheet,
The flexible sheet is provided with a length extending so that the lower end thereof is located on the downstream side of the overflow wall,
The foam reduction drainage structure further includes a perforated pipe disposed on a bottom area covered by the flexible sheet among the bottom of the downstream side and having a plurality of holes formed around the pipe,
At least one end of both ends of the perforated pipe is formed with an inlet through which a material for reducing foaming is introduced,
The bubble generation reducing material introduced into the perforated tube is formed by the cooling water passing between the front surface of the overflow wall and the flexible sheet or between the bottom and the flexible sheet on the downstream side due to the pressure difference between the inside and outside of the perforated tube, Naturally discharged through at least some of the plurality of holes, the foam reduction drainage structure. ◈Claim 2 was abandoned when paying the registration fee.◈ According to claim 1,
The flexible sheet unit,
a floating body disposed to float on the water surface of the water collecting chamber; and
and a roller cartridge having an upper end of the flexible sheet fixed and rotatably installed with respect to the floating body in a winding direction in which the flexible sheet is wound and in an unwinding direction in which the flexible sheet is unwound,
The roller cartridge is installed with respect to the floating body so as to be located above the water surface of the water collecting chamber, the foam reduction drainage structure. ◈Claim 3 was abandoned when paying the registration fee.◈ 3. The method of claim 2,
The roller cartridge is installed with respect to the float so that the flexible sheet extends from the rear of the float to the lower side of the float and to the front of the float, the foam reducing drainage structure. ◈Claim 4 was abandoned when paying the registration fee.◈ According to claim 1,
The flexible sheet, the lower end of which is provided with a length extending to be located on the downstream side of the overflow wall, the foam reduction drainage structure. ◈Claim 5 was abandoned when paying the registration fee.◈ 4. The method of claim 3,
Wherein the roller cartridge is installed with respect to the floating body so as to have a rotational friction force smaller than the rotational force in the loosening direction applied while a part of the flexible sheet is in contact with the flow of the coolant overflowing the overflow wall. ◈Claim 6 was abandoned when paying the registration fee.◈ 6. The method of claim 5,
Further comprising a driving force providing unit for providing a winding direction rotational driving force greater than the unwinding direction rotational force generated when the lower end of the flexible sheet is located on the downstream side of the overflow wall to the roller cartridge,
The roller cartridge is installed detachably for replacement,
Wherein the driving force providing unit provides a winding direction rotational driving force to the roller cartridge for recovering the winding direction of the flexible sheet before detachment for the replacement, the foam reduction drainage structure. ◈Claim 7 was abandoned when paying the registration fee.◈ 7. The method of claim 6,
The driving force providing unit, which is provided so as to be switchable to any one of a state separated from the roller cartridge and a state coupled with the roller cartridge to provide the winding direction rotational driving force to the roller cartridge struct. ◈Claim 8 was abandoned when paying the registration fee.◈ According to claim 1,
The flexible sheet unit,
a hinge portion spaced apart from the front or rear of the floating body arranged to float on the water surface of the water collecting chamber and having a horizontal direction corresponding to the width direction of the overflow wall as a center of rotation; and
The hinge-coupled to the hinge portion and comprising a rotating member connected to the floating body, bubble reduction drainage structure. ◈Claim 9 was abandoned when paying the registration fee.◈ 9. The method of claim 8,
The hinge portion is located in front of the floating body, the foam reduction drainage structure. According to claim 1,
The flexible sheet unit may include a reinforcing member installed at the front end of the flexible sheet to reduce flapping of the front end of the flexible sheet. ◈Claim 11 was abandoned when paying the registration fee.◈ 11. The method of claim 10,
The reinforcing member includes a base plate extending in a transverse direction and connected to the front end of the flexible sheet, and a plurality of partition members provided to protrude downward from a lower surface of the base plate and disposed at intervals in the transverse direction,
The plurality of partition members are provided so that the downward protrusion length of the front end is greater than the downward protrusion length of the rear end, the foam reduction drainage structure. ◈Claim 12 was abandoned when paying the registration fee.◈ 12. The method of claim 11,
By the plurality of partition members, the flow rate of overflow water passing through the lower front end of the base plate than the flow rate of the overflow water entering the lower rear end of the base plate is reduced, the bubble reduction drainage structure. delete ◈Claim 14 was abandoned at the time of payment of the registration fee.◈ According to claim 1,
The bottom region in which the perforated pipe is disposed is a bottom region to which at least a portion of the coolant overflowing the overflow wall through between the upper surface of the overflow wall and the lower surface of the flexible sheet among the floors on the downstream side reaches drainage structure.

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