JP6419624B2 - Intake system - Google Patents

Description

  The present invention relates to a water intake system for taking water from a water source.

  Conventionally, for example, in a power plant, a condenser that cools steam after a power generation turbine is rotationally driven is used. Seawater is used as a refrigerant in the condenser (seawater cooler). For example, in a seawater intake device that takes in seawater, a curtain wall (wall body) is provided at a position higher than the sea floor in front of the water intake section, and seawater that flows in through an opening between the lower end of the curtain wall and the sea floor is taken in. (For example, refer to Patent Document 1). In the technique described in Patent Document 1, an upper air ejection pipe for generating bubbles is provided on the outer ocean surface side of the curtain wall, and a lower air ejection pipe is provided on the ocean floor on the outer ocean side from the arrangement position of the upper air ejection pipe. Yes.

JP 2001-90051 A

  However, in the technique described in Patent Document 1 described above, there is a risk that unwanted materials may flow through the opening between the curtain wall, which is a wall body, and the sea bottom. Unnecessary material that flows in along with seawater is captured by a screen disposed downstream of the water intake. However, if the number of unnecessary materials increases, the disposal cost of unnecessary materials increases. Moreover, when the unnecessary thing caught by the screen increases, there exists a possibility that the screen may be obstruct | occluded, and, thereby, water intake will fall and it will interfere with a continuous operation.

  An object of this invention is to provide the water intake system which can reduce the unnecessary thing which approachs an inside through a water intake.

  The water intake system of the present invention is a water intake system that takes water from a water source through a water intake, and a diffuser is provided at the bottom of the water intake, and the ceiling above the air diffuser faces the water source. And tilted upward.

  In this water intake system, bubbles are released from the air diffuser provided at the bottom of the water intake. Since the ceiling part above the air diffuser is inclined upward toward the water source, the bubbles released from the air diffuser rise and hit the ceiling part and move to the water source side along the inclination of the ceiling part. Ascend while moving outside the water intake. Unnecessary items that flow into the water intake from the water source move upward by bubbles rising from the bottom of the water intake, move along with the bubbles flowing along the slope of the ceiling, and are discharged to the outside of the water intake. Therefore, it is possible to reduce unnecessary items that enter the inside through the water intake.

  It is preferable that the ceiling portion is inclined further downstream than the air diffuser in the direction of water flow. The bubbles released from the air diffuser rise toward the ceiling and are caused to flow downstream by the water passing through the water intake. Therefore, if the ceiling portion is inclined to the downstream side of the air diffuser, the raised bubbles move along the inclination of the ceiling portion formed to the downstream side of the air diffuser, and the outside of the water intake port. It is returned to and discharged.

  Moreover, it is preferable that the air diffusing device is arranged in a range of 30% or more and 90% or less with respect to the length of the range in which the inclination of the ceiling portion is formed in the water flow direction. Thereby, the inclination can be formed to the downstream side of the air diffuser. The flow rate of water in the vicinity of the water intake is generally 0.2 m / s, and even if the bubbles are flowed downstream with respect to this flow rate, the bubbles are within the range where the slope is formed in the ceiling. It becomes easy to pay. Therefore, it is possible to discharge the unnecessary matter that flows along with the bubbles back to the outside of the water intake port within a range where the slope is formed in the ceiling portion.

  Moreover, it is preferable that an air diffusion apparatus has an air diffusion hole which discharge | releases air, and an air diffusion hole is orient | assigned below rather than the horizontal direction. If the air diffuser is configured to face upward, sand that has flowed into the water intake port together with water may enter the air diffuser through the air diffuser and accumulate in the air diffuser. However, if the diffuser holes are oriented downward from the horizontal direction, the risk of sand entering the diffuser tube through the diffuser holes is reduced. Further, according to this air diffuser, since the air bubbles are directed downward from the air diffuser holes in the horizontal direction, the range in which the air bubbles are present can be further expanded downward.

  The air diffuser includes an air supply pipe that supplies air discharged from the blower to the bottom of the water intake port, and an air diffuser pipe that is disposed on the air supply pipe and discharges the air supplied through the air supply pipe into the water. It is preferable to provide. According to this structure, since an air supply pipe and a diffuser pipe can be comprised using piping, manufacture and field construction can be made easy. Further, since the air diffuser is disposed on the air supply pipe, the air diffuser can be disposed at a position spaced upward from the bottom surface on which the air supply pipe is disposed. Therefore, even if sand or the like accumulates on the bottom surface, the air diffuser can be exposed in water, and air can be reliably discharged from the air diffuser.

  ADVANTAGE OF THE INVENTION According to this invention, the water intake system which can reduce the unnecessary thing which penetrates into an inside through a water intake can be provided.

It is a schematic sectional drawing which shows the water intake system which concerns on one Embodiment of this invention. It is a top view which shows arrangement | positioning of the air supply pipe | tube and diffuser pipe | tube in FIG. It is a side view which shows arrangement | positioning of the air supply pipe | tube and diffuser pipe | tube in FIG. It is sectional drawing which shows the air supply pipe | tube and diffuser pipe | tube in FIG. It is a front view which shows the water intake which concerns on a modification. It is sectional drawing which shows the ceiling part of the water intake which concerns on a modification.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

  A water intake system 1 shown in FIG. 1 is provided in a thermal power plant, for example, and takes in seawater. Seawater taken in by the water intake system 1 is used as a refrigerant for a condenser that cools, for example, steam generated by rotating a power generation turbine. The intake system 1 has an intake port 2 through which seawater flows. A water channel 3 for circulating seawater downstream is formed downstream of the water intake 2.

  The water intake 2 is an opening provided in the quay 4 facing the sea as a water source. The water intake 2 is formed at a position with a water depth of 4 m, for example. The intake port 2 is a portion having a length of about 500 mm from the open end 21 on the sea side toward the land side. The width of the water intake 2 is, for example, 3000 mm. The water channel 3 is a portion extending from the water intake 2 to the land side. These water intake 2 and water channel 3 are channels having a rectangular cross section, for example, and are formed of concrete. The water channel 3 is provided with a screen device (not shown) for removing unnecessary materials that have entered the interior through the water intake 2.

  The water intake system 1 includes an air diffuser 5 that generates bubbles in water at the water intake 2. The air diffuser 5 includes a blower 6 that blows air, an air supply pipe 7 that transfers air discharged from the blower 6, and an air diffuser 8 that is connected to the air supply pipe 7. The blower 6 is arranged on the ground, sucks air and sends it to the air supply pipe 7.

  The air supply pipe 7 includes a ground pipe section 9 connected to the discharge port of the blower 6, a communication pipe section 10 bent downward from the ground pipe section 9 and extending in the vertical direction and entering the interior of the water channel 3. And a bottom pipe part 11 which is bent from the communication pipe part 10 and is arranged along the bottom part 3 a of the water channel 3 and connected to the air diffusion part 8. The air supply pipe 7 is formed of, for example, a vinyl chloride pipe. The communication piping unit 10 is embedded from the ground surface into the ground, passes through the ceiling 3 b of the water channel 3, and extends in the vertical direction inside the water channel 3. The bottom piping part 11 extends from the downstream side to the upstream side in the water channel 3, extends to the water intake 2, and is connected to the air diffusion part 8. The air supply pipe 7 may be formed of a material other than the vinyl chloride pipe.

  The air diffuser 8 generates bubbles in the water, and prevents bubbles from entering the water channel 3 due to the bubbles. Examples of underwater unnecessary materials include garbage such as plastic bags, juvenile shellfish, fish, and jellyfish. The air diffuser 8 includes a header pipe (air supply pipe) 12 connected to the bottom pipe section 11 and a plurality of air diffusers 13 connected to the header pipe 12. The header pipe 12 continues to the end of the bottom pipe section 11 on the water intake 2 side and extends to the vicinity of the opening end 21 on the sea side. The header pipe | tube 12 is arrange | positioned in the center part of the width direction (direction orthogonal to the water flow direction) of the water intake port 2, as FIG.2 and FIG.3 shows. The header pipe 12 is fixed to the bottom surface (bottom portion 22) of the water intake port 2 with a U-shaped fixture or the like. As the header tube 12, for example, a 100A vinyl chloride tube is used.

  The air diffuser 13 is arranged so as to intersect the header tube 12. A plurality of (for example, four) diffuser tubes 13 are arranged in the water flow direction. As shown in FIG. 4, the header pipe 12 and the diffuser pipe 13 are provided with openings at portions facing each other, and these headers are connected to communicate the header pipe 12 and the diffuser pipe 13. The openings of the header pipe 12 and the diffuser pipe 13 may be connected using a short pipe or may be directly connected. The header pipe 12 and the diffuser pipe 13 are joined by adhesion, for example.

  A plurality of air diffusion holes (through holes) 14 are formed in the tube wall of the air diffusion tube 13. The air diffuser 13 is a 60A vinyl chloride tube, for example, and the inner diameter of the air diffuser 14 is 5 [mm], for example. Further, the rising speed of the bubbles released from the air diffuser holes 14 having an inner diameter of 5 [mm] is, for example, 13 [m / s]. The rising speed of the bubbles can be, for example, about 65 times the average flow rate of seawater passing through the water intake 2. Also, other values may be used for the average flow velocity of seawater and the rising speed of bubbles. Further, the material of the air diffuser 13 is not limited to the vinyl chloride tube, and the outer diameter of the air diffuser 13 and the inner diameter of the air diffuser 14 may be other values.

  A plurality of air diffusion holes 14 are arranged at predetermined intervals in the direction in which the air diffusion tube 13 extends. Further, the air diffusion holes 14 are respectively provided on both sides in the water flow direction. The pair of air diffusion holes 14 arranged on both sides in the water flow direction are arranged, for example, at the same position in the direction in which the air diffusion tube 13 extends. The air diffusion holes 14 arranged on both sides in the water flow direction may be arranged at different positions in the direction in which the air diffusion tube 13 extends.

  The air diffusion holes 14 are formed so as to face downward from the horizontal direction, for example. The center line direction of the air diffusion hole 14 extends obliquely downward with respect to the horizontal direction.

  Moreover, the diffuser tubes 13 adjacent to each other in the water flow direction are arranged, for example, 60 mm apart. In the water flow direction, the range in which the plurality of diffuser tubes 13 are arranged is, for example, 420 mm ((outer diameter of the diffuser tube × 4) + (distance between diffuser tubes × 3)) in the case of 60A piping. . The range in which the air diffuser 13 is disposed is, for example, 30% or more and 90% or less of the length of the inclined surface of the ceiling in the direction of water flow.

  Moreover, the diffuser hole 14 formed in the diffuser pipe 13 adjacent to the flow direction of water is arrange | positioned in a mutually different position in the direction where the diffuser pipe 13 is extended. For example, the air diffuser 14 of the air diffuser 13 disposed on the upstream side is disposed at an intermediate position between the two air diffusers 14 adjacent in the direction in which the air diffuser 13 extends in the air diffuser 13 adjacent downstream. In addition, the diffuser hole 14 of the diffuser tube 13 adjacent to the water flow direction may be disposed at the same position in the longitudinal direction of the diffuser tube 13.

  In the air diffuser 8, mortar is applied as the air diffuser tube base portion 15 on both sides of the header tube 12 and below the air diffuser 13. In other words, a groove portion that accommodates the header pipe 12 is formed. The diffuser tube base portion 15 is formed so that the bottom surface of the diffuser tube 13 is in contact therewith. The diffuser tube base portion 15 can support the diffuser tube 13 from below, and can prevent the flow of water passing below the diffuser tube 13. A silicon filler or the like is applied to the gap between the header pipe 12 and the diffuser pipe base portion 15. Thereby, the flow of the water which passes the clearance gap between the header pipe | tube 12 and the diffuser pipe | tube base part 15 is prevented. Further, since the diffuser tube base portion 15 is formed below the diffuser tube 13, the flow of water below the diffuser tube 13 is prevented.

Here, in the water intake system 1, an inclined surface 24 is formed on the ceiling portion 23 of the water intake 2. The ceiling 23 of the water intake 2 is inclined obliquely upward from the land side toward the opening end 21 on the sea side. The inclination angle θ with respect to the horizontal direction of the inclined surface 24 is, for example, 10 degrees. The inclination angle θ of the inclined surface 24 with respect to the horizontal direction is preferably, for example, not less than 0.5 degrees and not more than 45 degrees. The inclination angle θ with respect to the horizontal direction of the inclined surface 24 may be a value exceeding 45 degrees, for example. Moreover, the inclined surface 24 is linearly formed in the cross section along the flow direction of water. If the inclination angle θ is too large, the opening area at the intake port 2 increases, and the average flow velocity v of seawater passing through the intake port 2 decreases. The average flow velocity v of seawater passing through the water intake 2 is generally set to 0.2 m / s, for example, at power plants in Japan. If the inclination angle θ becomes too large, the horizontal component V _A24 (= V _A / tan θ) of the moving speed of the bubbles moving to the opening end 21 along the inclined surface 24 decreases, and the inside of the intake port 2 The force which pushes back the unnecessary thing which entered into the opening end 21 decreases. In addition, _VA is a bubble rising speed as described later.

  Moreover, the inclined surface 24 of the ceiling part 23 of the water intake 2 is formed from the air diffusion part 8 to the downstream side in the water flow direction. In the water flow direction, a length L1 from the downstream end 8a of the air diffuser 8 to the downstream end 24a of the inclined surface 24 is, for example, 72 mm or more.

The length L1 may be calculated according to the following (1). The rising speed of bubbles is _VA [m / s], the average flow velocity of seawater passing through the intake is v [m / s], the height of the water channel is h [m], and the downstream end of the air diffuser 8 When the length from 8a to the end 24a on the downstream side of the inclined surface 24 of the ceiling portion 23 is L1, the length L1 can be calculated by the following equation (1).

L1 = (h / V _A ) × v (1)

  Next, the operation of the water intake system 1 will be described.

  When the blower 6 is driven, the air discharged from the blower 6 is supplied to the air diffuser 8 through the air supply pipe 7. The air supplied to the air diffuser 8 is introduced into the header pipe 12 and supplied to each air diffuser 13. The air supplied to the air diffuser 13 is discharged into the water from each air diffuser 14. The air released from the air diffuser 14 floats in the water as bubbles.

  In the water intake system 1, a plurality of air diffusers 13 are provided, and in each air diffuser 13, air diffuser holes 14 are formed on both sides in the water flow direction. Are formed continuously.

  The underwater bubbles are caused to flow downstream due to the flow of seawater inside the water intake 2, but the inclined surface 24 is formed downstream of the air diffuser 8 in the ceiling portion 23. The air bubbles fall within the range where the inclined surface 24 is formed. When the air bubbles that have risen and reach the ceiling portion 23 hit the inclined surface 24, the bubbles move along the inclined surface 24 toward the opening end 21 on the sea side of the water intake 2. When the air bubbles rising from the downstream air diffuser 13 move along the inclined surface 24, the air bubbles rising from the upstream air diffuser 13 are combined and gradually become larger toward the upstream side.

  And the unnecessary thing which flowed into the inside of the water intake 2 with seawater changes the moving direction by the bubble which floats from the diffuser part 8 of the bottom part 22, and moves upwards with the bubble which floats. Unnecessary objects that have moved upward together with the bubbles move along the inclined surface 24 of the ceiling portion 23 toward the sea-side end of the water intake port 2 along with the flow of the bubbles. Bubbles and unnecessary materials reach the end of the intake port 2 on the sea side and are discharged to the outside of the intake port 2. The unnecessary matter discharged to the outside of the water intake port 2 rises with the rising air bubbles and leaves the water intake port 2.

  According to the water intake system 1 of the present embodiment, the unwanted matter that has entered the water intake 2 rises with the air bubbles rising from the bottom 22 of the water intake 2, and moves to the sea side along the inclined surface 24 of the ceiling portion 23. And discharged from the water intake 2. Therefore, the unnecessary thing which flows into the water channel 3 through the water intake 2 will reduce, and the unnecessary material caught by the screen apparatus of the downstream of the water channel 3 can be reduced. As a result, the screen device can be continuously operated. In addition, since unnecessary materials that reach the screen device can be reduced, unnecessary materials that pass through the screen device and flow into downstream equipment (such as condensers) are reduced, reducing problems in downstream equipment. can do. As a malfunction of the downstream equipment, it is possible to prevent the blockage of the flow path due to unnecessary materials and the decrease in the flow rate of seawater. Further, maintenance work such as cleaning in the downstream facility can be reduced.

  Moreover, according to the water intake system 1, since the unnecessary matter which reaches | attains a screen apparatus is reduced, the unnecessary matter captured is reduced, Therefore The disposal expense for processing the supplemented unnecessary matter is reduced.

  Further, in the water intake system 1, it is only necessary to install the air diffuser 8 at the bottom 22 of the water inlet 2, so that the structure of the water intake system 1 can be simplified. In addition, since it is possible to omit the installation of a net-like member such as a net that has conventionally been installed in the vicinity of the water intake, the maintenance work for such a net-like member can be reduced. For example, in the past, a diver or the like dived into the sea as an operator and performed cleaning or inspection. However, it is not necessary to perform such dangerous work, and maintenance costs can be reduced. Moreover, since it is not necessary to provide a drive part inside the intake port 2, maintenance costs, such as an inspection and repair of a drive part, are reduced.

  Moreover, in the water intake system 1, since the inclined surface is formed to the downstream rather than the diffuser part 8 in the water flow direction, the bubbles discharged from the diffuser pipe 13 and flowed downstream enter the downstream water channel. Since it reaches the inclined surface 24 of the ceiling part 23 without entering and is returned to the sea side along the inclined surface 24, it is possible to prevent an unnecessary material from entering the water channel 3.

  Further, in the water intake system 1, a plurality of air diffusers 13 are provided, and bubbles can continuously float within a range having a predetermined width in the direction of water flow. As a result, unnecessary items entering the downstream water channel are reduced.

  Further, since the diffuser holes 14 provided in the diffuser pipe 13 are directed downward from the horizontal direction, it is possible to prevent sediments such as sand from entering the diffuser pipe 13 through the diffuser holes 14. .

  Moreover, in this water intake system 1, since the diffuser pipe | tube 13 is employ | adopted for the diffuser part 8 which generates a bubble, and the top | upper surface of the diffuser pipe | tube 13 is a curved surface, underwater sand etc. are hard to accumulate. Therefore, the diffuser 13 is prevented from being buried in the sand. As a result, the air is surely released from the air diffusion holes 14.

  Moreover, in this intake system 1, since the opening width in the up-down direction of the intake port 2 increases from the downstream toward the upstream, the flow rate becomes slower toward the upstream side, and unnecessary objects are discharged toward the upstream side. The discharge power of will increase. In addition, as the bubbles rise, the bubbles gather and the bubble diameter increases, so that the rising speed of the bubbles increases. By these, discharge power becomes large so that it goes to the sea side, an unnecessary thing can be suitably discharged | emitted, and the approach of the unnecessary object to the inside of the waterway 3 can be prevented.

  Next, a modification of the water intake will be described with reference to FIG. In the above embodiment, the shape of the ceiling portion 23 of the water intake port 2 is linearly formed in the horizontal direction in a cross section orthogonal to the water flow direction, but other shapes may be used. For example, as shown in FIG. 5A, the cross-sectional shape of the ceiling portion 23B of the water intake port 2B may be formed in a mountain shape. It is formed so as to incline to both sides in the width direction with the central portion in the width direction as a vertex. Also in such a water intake 2B, the inclined surface 24B which inclines upward from the downstream side toward the upstream side toward the sea-side end portion is formed in the water flow direction. Also in the width direction, an inclined surface 24B that is inclined upward from the outside toward the inside is formed.

  In such a water intake port 2B, when the air bubbles floating upward at the center in the width direction hit the inclined surface 24B, they move as they are toward the sea side along the vertex at the center in the width direction. In addition, when the bubbles that have floated upward on the outer side in the width direction hit the inclined surface 24B, they move inward in the width direction and move toward the sea side. That is, since the air bubbles that have risen from the bottom are collected at the center in the width direction, the air bubble diameter increases and moves to the sea side. As a result, unnecessary objects that move with the bubbles also rise and are collected at the center in the width direction. Unnecessary objects in the vicinity of the ceiling part 23B move to the sea side together with the air bubbles that have been collected in the central part and have a large air bubble diameter, and are suitably discharged from the water intake 2B. As a result, it is possible to reduce unnecessary materials that pass through the water intake 2 </ b> B and enter the water channel 3.

  Moreover, the cross-sectional shape of the ceiling portion 23C of the water intake port 2C may be formed to be curved as shown in FIG. Also in such a water intake 2C, in the water flow direction, an inclined surface 24C that is inclined upward from the downstream side toward the upstream side toward the sea end is formed. In the width direction, it is curved so that the central portion is highest from the outside toward the inside. In such a water intake 2C, the air bubbles rising from the bottom are collected at the center in the width direction, and the air bubble diameter increases and moves to the sea side. Unnecessary objects that have moved upward together with the air bubbles are gathered at the central portion of the ceiling portion 23C and moved to the sea side together with the air bubbles having a larger air bubble diameter, and are suitably discharged from the water intake port 2C. As a result, it is possible to reduce unnecessary materials that pass through the water intake 2C and enter the water channel 3.

  Moreover, the cross-sectional shape of the ceiling part of the water intakes 2, 2 </ b> B, 2 </ b> C may be other shapes, for example, a shape in which the outside is higher than the inside in the width direction.

  Next, a modification of the water intake will be described with reference to FIG. In the above embodiment, the water flow direction is such that the inclined surface 24 is inclined upward from the downstream side toward the upstream side. However, as shown in FIG. The ceiling portion 23 </ b> D may have a plurality of step surfaces 25 so as to be inclined upward from the downstream side toward the upstream side.

  The ceiling portion 23 </ b> D of the water intake 2 </ b> D includes a step surface 25 that is a horizontal surface, and a vertical surface 26 that extends upward from an end portion of the step surface 25. The step surface 25 is formed to extend upstream from the upper end of the vertical surface 26 adjacent to the downstream side, and the vertical surface 26 extends upward from the upstream end of the step surface 25 adjacent to the downstream side. Is formed. Thus, the ceiling part 23D of the water intake 2D may be entirely inclined by alternately arranging the step surfaces 25 and the vertical surfaces 26. For example, when the straight line L25 connecting the upstream end portions 25a of the plurality of step surfaces 25 is inclined, it is assumed that the ceiling portion 23D of the water intake port 2D is inclined.

  Even in such a water intake 2 </ b> D, bubbles rising from below hit the step surface 25. Here, a vertical surface 26 extending downward is formed on the downstream side of the step surface 25, and a vertical surface 26 extending upward is formed on the upstream side of the step surface 25. Moves to the upstream side instead of the downstream side and rises. The bubbles ascend along the upstream vertical surface 26 and hit the upstream step surface 25. In this way, the bubbles move to the upstream side and move up to the sea side end portion in order and are discharged from the water intake 2D. As a result, the unwanted material that has flowed into the water intake 2D moves upward along with the air bubbles rising from the bottom of the water intake 2D, and sequentially moves along with the air bubbles along the ceiling 23D to the upstream side. It will be discharged from the end. As a result, it is possible to reduce unnecessary materials that pass through the water intake 2D and enter the water channel 3 on the downstream side.

6A, the ceiling 23E of the water intake 2E may have a plurality of inclined surfaces 27 and 28 that are inclined at different angles. The ceiling portion 23E of the water intake port 2E has an inclined surface 27 arranged on the downstream side and an inclined surface 28 adjacent to the upstream side of the downstream inclined surface 27. The inclination angle θ ₂₈ of the upstream inclined surface ₂₈ is larger than the inclination angle θ ₂₇ of the downstream inclined surface 27. Even in such a water intake 2E, together with the air bubbles that rise, unnecessary materials are caused to flow upstream and are discharged from the water intake 2E. Therefore, it is possible to suppress the entry of unnecessary materials into the water channel 3.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible without departing from the gist of the present invention.

  In the said embodiment, although it is set as the structure provided with the some diffuser tube 13, the diffuser part provided with only the one diffuser tube 13 may be sufficient, and the structure provided with the two or more diffuser tubes 13 may be sufficient.

  Further, the air diffusion holes 14 may be oriented in the horizontal direction, or may be oriented upward from the horizontal direction. Further, a configuration in which a plurality of air diffusion holes 14 are formed in the circumferential direction of the air diffusion tube 13 may be employed.

  Moreover, in the said embodiment, although the air diffusion pipe | tube 13 is arrange | positioned so that it may extend in the width direction of the water intake port 2, the direction where the air diffusion pipe | tube 13 extends is not limited, For example, it extends in the flow direction of water. A configuration in which a plurality of diffuser tubes are arranged in the width direction of the water intake port 2 may be employed. Further, the air diffuser 13 may be arranged so as to cross obliquely with respect to the water flow direction. Further, the air diffusion tube 13 may be disposed below the header tube 12.

  In the said embodiment, although the air diffusion part 8 is arrange | positioned on the bottom face of the water intake 2, for example, a groove part is formed in a bottom face and the opening of a groove part is covered using the cover member in which the air diffusion hole was formed. The formed diffuser may be used. Moreover, the shape of the air diffusion hole 14 may be a circle, a long hole, a rectangle, or other shapes.

  In the above embodiment, air bubbles are generated in the water by releasing air from the air diffuser 13, but bubbles are generated by discharging air from a sheet-like film (flat curtain) instead of the air diffuser 13. You may let them.

  Moreover, the sea side edge part of the ceiling part 23 of the water intake 2 may be formed in the same position as the sea side edge part of the bottom part 22 in the water flow direction, and the sea side edge part of the bottom part 22. You may arrange | position more protrudingly. Moreover, the sea side edge part of the bottom part 22 of the water intake 2 may protrude rather than the sea side edge part of a ceiling part in the flow direction of water. Further, the air diffuser may be disposed to the outside of the opening end 21 on the sea side of the intake port.

  Moreover, in the said embodiment, although the communication piping part 10 is arrange | positioned so that it may extend up and down in the center of the width direction of the water channel 3, the communication piping part 10 extends up and down near the side wall of the water channel 3. For example, it may be arranged so as not to pass through the inside of the water channel 3 so as to protrude from the side wall of the water intake port 2 to the central portion in the width direction. Moreover, the header pipe | tube 12 is not limited to what is arrange | positioned in the center of the width direction, The thing arrange | positioned along a side wall may be sufficient.

  Moreover, in the said embodiment, although the water intake 2 and the water channel 3 are formed with concrete, it may be formed with the other material, for example, may be the water intake and water channel which consist of piping.

  Moreover, it may replace with the diffuser pipe | tube base part 15, and the structure provided with the weir plate arrange | positioned so that it may orthogonally cross with respect to the flow direction of water may be sufficient. It is preferable that the dam plate is disposed below the air diffuser 13 and at an upstream end and a downstream end in a range where the air diffuser 13 is disposed. Thereby, the flow of water below the diffuser tube 13 can be blocked, and a space for deposits such as sand can be secured. Thereby, it is possible to prevent the air diffuser 13 disposed on the header tube 12 from being buried by deposits, and it is possible to reliably release air from the air diffuser holes 14 to generate bubbles.

  Moreover, although the sea which is a water source has demonstrated as the water intake system which takes in seawater in the said embodiment, the water source to which a water intake system is applied is not limited to the sea, A lake, a reservoir, a river, etc. may be sufficient. Moreover, the facility where the taken-in water is used is not limited to a power plant, but may be a refinery, a factory, a salt factory, or other facilities.

  Moreover, the water intake 2 is not limited to what was provided in the quay 4, and what was arrange | positioned so that it may protrude in the sea side may be used.

  DESCRIPTION OF SYMBOLS 1 ... Intake system, 2, 2B, 2C, 2D, 2E ... Intake port, 3 ... Water channel, 5 ... Air diffuser, 6 ... Air blower, 7 ... Air supply piping, 8 ... Air diffuser, 12 ... Header pipe (supply pipe) Trachea), 13 ... diffuser, 14 ... diffuser, 22 ... bottom, 23, 23B, 23C, 23D, 23E ... ceiling, 24, 24B, 24C, 27, 28 ... inclined surface, 25 ... step surface, 26 ... Vertical plane.

Claims (5)

A water intake system for taking water from a water source through a water intake,
At the bottom of the intake port is provided an air diffuser that generates bubbles in the water ,
A water intake system in which a ceiling portion above the air diffuser is inclined upward toward the water source. The water intake system according to claim 1, wherein the ceiling portion is inclined further downstream than the air diffusion portion in the water flow direction. The length in the flow direction of the water in the range where the air diffuser is disposed is 30% or more and 90% or less with respect to the length in the flow direction of the water in the range where the slope of the ceiling is formed. The water intake system according to claim 1 or 2. The air diffuser has air diffuser holes for releasing air,
The water intake system according to any one of claims 1 to 3, wherein the air diffuser is directed downward from a horizontal direction. The air diffuser is
An air supply pipe connected to an air supply pipe for transferring the air discharged from the blower to the bottom of the water intake;
The water intake system according to any one of claims 1 to 4, further comprising: a diffuser pipe disposed on the air supply pipe and configured to discharge the air supplied through the air supply pipe into water.

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