JP2014025236A - Water intake facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide water intake facilities capable of easily and inexpensively preventing the inflow of shellfish into a circulation pump by capturing the shellfish without use of a large-scale device.SOLUTION: Water intake facilities 1 include an intake 11 that is a seawater intake port, a pump tank 12 in which a circulation pump 23 for water supply is installed, and an inlet channel 13 that connects the intake 11 and the pump tank 12 together. An inlet channel side wall 24 immediately in front of a pump tank inlet 21 is provided with a recess-shaped side wall expansion trap 31 that locally decreases a seawater flow velocity to capture and accumulate shellfish 51.

Description

  The present invention relates to a water intake facility that sends seawater to a circulation pump that feeds seawater.

  Power plants such as thermal power plants and nuclear power plants are provided with a circulation pump that supplies seawater for cooling to a condenser that cools the steam used for power generation. Seawater is supplied. The intake facility includes an intake port that is an intake port for seawater, a pump tank, and an intake channel that connects the intake port and the pump tank, and the circulation pump is installed in a pump tank that is the end of the intake facility. The intake channel connected to the pump tank has a length of several hundred to several thousand meters, and seawater is always stored during operation.

  Shellfish such as blue mussels and barnacles inhabit the sea water, and when these young shellfish grow on the walls of the intake channel and die, they fall off the walls. Dead shellfish are carried by seawater and accumulate in a place where the seawater flow velocity in the intake facility is slow, particularly in a pump tank that is usually designed wider than the intake channel. When the amount of shellfish accumulated increases, the flow path area becomes narrower and the seawater velocity increases, so when a certain amount of sediment is exceeded, the shellfish overflows and eventually flows into a circulation pump installed near the end of the pump tank. When shellfish flow into the circulation pump, the shellfish are transported along with the seawater to the condenser via the circulation pump, causing the tube of the condenser to be damaged. It is necessary to prevent the tube breakage of the condenser because it will stop the power generation. Normally, in the water intake equipment, a screen is provided in front of the circulation pump to prevent the inflow of shellfish and the like. However, when the amount of shellfish becomes large, the screen may become clogged and hinder the operation.

  In order to prevent shellfish from flowing into the circulation pump, techniques for removing shellfish in the pump tank and techniques for storing shellfish in the pump tank have been proposed. For example, there is a device that installs a suction pump on land, installs a pipe port connected to the pump pump in a pump tank, and sucks and removes accumulated shellfish (see, for example, Patent Document 1). In addition, there is a water intake facility that provides a shell reservoir in which the bottom of the pump tank is dug to store a certain amount of shellfish and prevent the shellfish from flowing into the circulation pump (see, for example, Patent Document 2).

JP-A-6-88317 JP 2011-111866 A

  The apparatus for removing shellfish described in Patent Document 1 is large and requires its own maintenance, which is costly. Also, when the equipment breaks down, it is necessary to stop the operation of the water intake equipment and remove the accumulated shellfish.

  In the water intake equipment provided with a shell reservoir at the bottom of the pump tank described in Patent Document 2, the position where the shell reservoir is provided is restricted, and the amount of shellfish stored is restricted by the size of the pump tank. Moreover, the operation | work which collects shellfish in a pump tank is not necessarily easy.

  An object of the present invention is to provide a water intake facility capable of capturing shellfish without using a large-scale device and preventing shellfish from flowing into a circulation pump easily and inexpensively.

  The present invention relates to a water intake facility including a water intake that is an intake of seawater, a pump tank provided with a circulation pump for water supply, and a water intake path that connects the water intake and the pump tank. The water intake facility is characterized in that a concave side wall expansion trap for trapping and depositing shellfish by locally lowering the seawater flow velocity is provided at an arbitrary location on the side wall.

  According to the present invention, the concave side wall expansion trap for trapping and depositing shellfish by locally lowering the seawater flow velocity is provided, and shellfish can be deposited here, so that circulation without using a large-scale device is possible. Shellfish inflow to the pump can be easily prevented. In addition, the side wall expansion trap can be provided at any location on the side wall of the intake channel, so if it is installed in an appropriate location according to the structure, shape, etc. of the intake channel, shellfish can be efficiently captured and the recovery operation can be facilitated. .

  Moreover, the present invention is characterized in that, in the water intake facility, the side wall expansion trap is provided immediately before the inlet of the pump tank, and shellfish are captured immediately before the inlet of the pump tank.

  According to the present invention, the side wall expansion trap is provided immediately before the inlet of the pump tank, and shells are captured immediately before the inlet of the pump tank, so that the inflow of shells into the pump tank is minimized. Shellfish inflow to the circulation pump can be prevented.

  Further, the present invention is characterized in that, in the water intake facility, the side wall expansion trap has a trapezoidal shape in which the outer bottom is shorter than the inner bottom in plan view, and shells can be easily recovered.

  According to the present invention, the side wall expansion trap has a trapezoidal shape in which the outer bottom is shorter than the inner bottom in plan view, and shells are easily collected. It can be carried out efficiently.

  Further, in the intake system, a concave bottom expansion trap that further increases the amount of shellfish accumulated is provided across the intake channel width direction on the bottom surface of the intake channel where the side wall expansion trap is provided. It is characterized by.

  According to the present invention, the concave bottom expansion trap that further increases the amount of shellfish accumulated is provided across the intake channel width direction on the bottom surface of the intake channel where the side wall expansion trap is provided. The frequency can be reduced.

  Further, in the water intake facility, the baffle plate for preventing the shellfish from flowing out is provided at the downstream end portion of the side wall expansion trap at right angles to the intake channel longitudinal direction, and is provided over the intake channel width direction, The upper side of the baffle plate is characterized by being lower than the sea level.

  According to the present invention, the baffle plate for preventing the shellfish from flowing out is provided at the downstream end portion of the side wall expansion trap over the intake channel width direction, so that the shellfish passes over the side wall expansion trap to the circulation pump. Inflow can be prevented.

  According to the present invention, it is possible to capture shellfish without using a large-scale device and to prevent shellfish from flowing into the circulation pump easily and inexpensively.

It is a cross-sectional view which shows the whole structure of the water intake equipment 1 as 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the side wall expansion trap 31 vicinity of the water intake equipment 1 of FIG. It is a transverse cross section of intake channel 13 of intake facility 2 as a 2nd embodiment of the present invention. It is a cross-sectional view which shows the whole structure of the water intake equipment 3 as 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the side wall expansion trap 31 vicinity of the water intake equipment 4 as 4th Embodiment of this invention. It is a cross-sectional view near the side wall expansion trap 31 of the water intake facility 5 as the fifth embodiment of the present invention. It is a longitudinal cross-sectional view of the side wall expansion trap 31 vicinity of the water intake equipment 5 of FIG.

  FIG. 1 is a cross-sectional view showing the overall configuration of a water intake facility 1 as a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the vicinity of the side wall expansion trap 31 of the water intake facility 1 of FIG. First, the overall configuration of the water intake facility 1 will be described, and then the flow of catching and depositing shellfish 51 will be described.

  The water intake facility 1 is a facility that takes in seawater used as condenser cooling water for a thermal power plant (not shown), and includes a water intake port 11 for taking in seawater, a pump tank 12 into which seawater flows, and a water intake port 11. And a water intake passage 13 that connects the pump tank 12. The intake port 11, the pump tank 12, and the intake channel 13 are an integral structure. Seawater flows from the intake port 11 through the intake channel 13 to the pump tank 12. The side wall of the intake channel 13 is provided with a concave side wall expansion trap 31 that traps the shellfish 51 and deposits the shellfish 51 in a concentrated manner.

  The intake 11 is an intake of seawater, and is installed in a place facing the sea or in the sea. The intake port 11 is connected to the proximal end of the intake channel 13 and introduces seawater into the intake channel 13.

  The pump tank 12 is connected to the end of the intake passage 13, and a water circulation pump 23 is installed near the end of the pump tank 12. The pump tank 12 is gradually expanded from the pump tank inlet 21, which is the end of the intake path 13, in order to install the circulation pump 23, and the flow path cross-sectional area is larger than the intake path 13. Therefore, the pump tank 12 is a place where the seawater flow rate is slower than the intake channel 13 and the shellfish 51 is easily deposited. The pump tank 12 has a 90-degree curved shape, and the seawater flow velocity is further reduced in the curved portion inner flow path 22, so that shellfish 51 are likely to accumulate.

  The circulation pump 23 is installed near the end of the pump tank 12 and feeds seawater to a condenser (not shown) of the power plant. In the present embodiment, two circulation pumps 23 are installed, but the number is not limited to two. One or more circulation pumps 23 are installed according to the size of the water intake facility 1.

  The intake channel 13 is a seawater channel that connects the intake port 11 and the pump tank 12, and is made of concrete having a rectangular longitudinal section. For example, the intake channel 13 has a width of about 3 m, a height of about 10 m, and a total length of several hundred to several thousand m.

  The side wall expansion trap 31 is formed by extending a part of each side of the intake channel side wall 24 into a concave shape so that the flow path cross-sectional area locally increases, and is provided immediately before the pump tank inlet 21. The side wall expansion trap 31 is not limited to the position immediately before the pump tank inlet 21 and can be provided at an arbitrary place. Therefore, it is possible to effectively prevent the shellfish 51 from flowing into the pump tank 12 and the circulation pump 23.

  Due to the structure of the intake channel, the side wall expansion trap 31 cannot be provided immediately before the pump tank inlet 21, and when the side wall expansion trap 31 is provided upstream of the pump tank inlet 21, the side wall expansion trap 31 Also, the shellfish 51 generated on the downstream side flows into the pump tank 12 without being captured by the side wall expansion trap 31. In such a case, the location of the side wall expansion trap 31 is set so that at least the amount of shellfish 51 flowing into the pump tank 12 does not reach the amount that overflows from the pump tank 12 to the circulation pump 23. Thereby, the inflow of the shellfish 51 to the circulation pump 23 can be prevented.

  The size of the side wall expansion trap 31 is such that the seawater flow rate can be slowed to such an extent that the shellfish 51 is retained, and the shellfish 51 can be deposited for a long period of time. What is necessary is just to decide suitably by frequency. If it is set as the size which can accumulate all the shellfish 51 generated by the next regular cleaning, the inflow of the shellfish 51 to the pump tank 12 and the circulation pump 23 can be prevented effectively.

  When the side wall expansion trap 31 cannot be made sufficiently large due to cost or physical restrictions, the shells 51 overflow from the side wall expansion trap 31 and flow into the pump tank 12, but at least the shells 51 flowing into the pump tank 12 The size of the side wall expansion trap 31 is set so that the amount does not reach the amount that overflows from the pump tank 12 to the circulation pump 23. Thereby, the inflow of the shellfish 51 to the circulation pump 23 can be prevented.

  Moreover, when the side wall expansion trap 31 cannot be made sufficiently large as described above, the amount of shellfish 51 deposited can be compensated by providing another side wall expansion trap 31 upstream of the side wall expansion trap 31. .

  The side wall expansion trap 31 has a trapezoidal shape in which the outer bottom 41 is shorter than the inner bottom in plan view, and the angles formed by the intake channel side wall 24, the upstream inclined surface 42, and the downstream inclined surface 43 are respectively set. It is an obtuse angle. The shape of the side wall expansion trap 31 in plan view is not limited to a trapezoidal shape, but a trapezoidal shape is preferable because the shellfish 51 can be easily collected. At this time, if the angle between the intake side wall 24 and the upstream inclined surface 42 is an angle at which the vortex caused by the separation flow occurs in the side wall expansion trap 31, the shellfish 51 can be captured more easily. What is necessary is just to decide suitably.

  Next, the flow of catching and depositing shellfish 51 in the water intake facility 1 of the present invention will be described. The seawater taken from the intake port 11 includes a large number of juvenile shellfish, which adhere to the entire wall surface of the intake channel 13. The attached juveniles will fall off when they grow up and die. The shellfish 51 that has been peeled off is carried toward the pump tank 12 by seawater and reaches the side wall expansion trap 31. In the side wall expansion trap 31, since the flow path cross-sectional area is large, the seawater flow velocity becomes slow and shellfish 51 are deposited.

  The accumulated shellfish 51 is collected periodically. The shellfish 51 is concentrated and accumulated on the side wall expansion trap 31, and since the side wall expansion trap 31 has a trapezoidal shape, it is concentrated using an underwater robot (not shown) or an underwater pump (not shown). And it can collect | recover easily and can collect | recover, without stopping the water intake equipment 1. FIG.

  Thus, when this water intake equipment 1 is used, the shellfish 51 can be concentrated and deposited in one place, and the collected shellfish 51 can be collect | recovered easily. Therefore, the inflow of shellfish 51 to the pump tank 12 and the circulation pump 23 can be effectively prevented.

  On the other hand, when there is no side wall expansion trap 31, the shellfish 51 passes through the intake channel 13 and flows into the pump tank 12. Since the pump tank 12 is wider than the intake channel 13, the seawater flow rate is slow and shellfish 51 is likely to accumulate. When the shellfish 51 is deposited, the channel cross-sectional area is gradually narrowed and the seawater flow velocity is increased. When a certain amount is deposited, the shellfish 51 overflows and flows into the circulation pump 23. The place where the shellfish 51 is deposited in the pump tank 12 cannot be easily specified because it covers a wide area, and the water intake facility 1 is stopped at the time of recovery.

  Moreover, in the curved part inner side flow path 22 of the pump tank 12, seawater flow velocity becomes still slower, and shellfish 51 accumulates in large quantities. When the curved portion inner flow path 22 is blocked by the accumulated shellfish 51, the seawater flow velocity of the other flow paths is increased, and the shellfish 51 flows into the circulation pump 23.

  Further, the pump tank 12 is designed so as not to generate a rotating flow that causes suction vortices in the circulation pump 23 in order to prevent air from becoming a cause of failure of the circulation pump 23. If shellfish 51 is deposited in the pump tank 12, an unexpected rotating flow may be generated and air may be mixed into the circulation pump 23. Therefore, it cannot be said that the state where the shellfish 51 is accumulated in the pump tank 12 is preferable.

  FIG. 3 is a cross-sectional view of the intake channel 13 of the intake facility 2 as the second embodiment of the present invention. The same code | symbol is attached | subjected to the structure same as the water intake equipment 1 shown in 1st Embodiment, and description is abbreviate | omitted.

  The configuration of the water intake facility 2 shown in the second embodiment is basically the same as that of the water intake facility 1 shown in the first embodiment, but the installation position and number of side wall expansion traps are different. A plurality of side wall expansion traps 31 a, 31 b, and 31 c are provided in the water intake passage 13 of the water intake facility 2 at intervals. The structure and shape of the side wall expansion traps 31a, 31b, 31c used here can be the same as those of the side wall expansion trap 31 shown in the first embodiment.

  The side wall expansion trap 31a deposits shellfish 51 generated between the water intake port 11 and the side wall expansion trap 31a. Similarly, the side wall extension trap 31b deposits shells 51 generated between the side wall extension trap 31a and the side wall extension trap 31b, and the side wall extension trap 31c is provided with the shells 51 generated between the side wall extension trap 31b and the side wall extension trap 31c. To deposit.

  When a plurality of side wall expansion traps 31 are provided in this way, shellfish 51 can be dispersed and deposited. As a result, each side wall expansion trap 31a, 31b, 31c can be made smaller than the side wall expansion trap 31 of the water intake facility 1 of the first embodiment.

  When a plurality of side wall expansion traps 31a, 31b, and 31c are provided in the intake channel 13 as in the present embodiment, a section where the shellfish 51 is likely to be generated is estimated by confirming the accumulation amount of the shellfish 51 in each side wall expansion trap. be able to. On the other hand, the collection and collection location of the shellfish 51 cannot be concentrated in one place, so that the collection operation takes time. Since the number of side wall expansion traps 31 is not limited to a specific number, the number may be determined as appropriate by comparing costs and the above merits and demerits.

  FIG. 4 is a cross-sectional view showing the overall configuration of the water intake facility 3 as the third embodiment of the present invention. The same code | symbol is attached | subjected to the structure same as the water intake equipment 1 shown in 1st Embodiment, and description is abbreviate | omitted.

  Although the structure of the water intake equipment 3 shown in 3rd Embodiment is fundamentally the same as the water intake equipment 1 shown in 1st Embodiment, the shape of the water intake path 13 differs. The structure and shape of the side wall expansion trap 32 are also different from the side wall expansion trap 31 of the first embodiment.

  In the water intake facility 3 shown in the third embodiment, a side wall expansion trap 32 is provided only on one side of the water intake side wall 24. When the side wall expansion trap cannot be provided on both sides of the intake channel side wall 24 due to cost or physical restrictions, the side wall expansion trap 32 may be provided only on one side of the water channel side wall 24 as in this embodiment. In particular, when the intake channel 13 is curved as shown in FIG. 4, the flow velocity is reduced inside the curved portion, so that the shells 51 can be effectively removed even if the side wall expansion trap 32 is provided only inside the curved portion. Can be captured and deposited.

  FIG. 5 is a longitudinal sectional view of the vicinity of the side wall expansion trap 31 of the water intake facility 4 as the fourth embodiment of the present invention. The same code | symbol is attached | subjected to the structure same as the water intake equipment 1 shown in 1st Embodiment, and description is abbreviate | omitted.

  In the intake facility 4 shown in the fourth embodiment, a bottom expansion trap for increasing the amount of shellfish 51 deposited on the intake channel bottom surface 25 where the side wall expansion trap 31 is provided in addition to the intake facility 1 shown in the first embodiment. 33 is provided in a concave shape over the width direction of the intake channel 13.

  The size of the bottom surface expansion trap 33 may be appropriately determined so that the shellfish 51 does not overflow and flow into the circulation pump 12 at least until the next regular cleaning, as with the side wall expansion trap 31. When the bottom surface expansion trap 33 is provided, the amount of the shellfish 51 deposited can be increased by the volume, and as a result, the side wall expansion trap 31 can be reduced.

  The bottom expansion trap 33 has a trapezoidal shape in which the outer bottom 44 is shorter than the inner bottom in the longitudinal cross-sectional shape in order to facilitate the recovery of the shellfish 51, and the intake bottom 25, the upstream inclined surface 45, and the downstream Although the angle formed with the side inclined surface 46 is an obtuse angle, like the side wall expansion trap 31, it is not limited to a trapezoidal shape.

  FIG. 6 is a cross-sectional view in the vicinity of the side wall expansion trap 31 of the water intake facility 5 as the fifth embodiment of the present invention, and FIG. 7 is a vertical cross-sectional view in the vicinity of the side wall expansion trap 31 of the water intake facility 5 in FIG. is there. The same code | symbol is attached | subjected to the structure same as the water intake equipment 1 shown in 1st Embodiment, and description is abbreviate | omitted.

  In the water intake facility 5 shown in the fifth embodiment, in addition to the water intake facility 1 shown in the first embodiment, a baffle plate 34 that prevents the shellfish 51 from flowing out is provided on the intake passage bottom surface 25 at the downstream end portion of the side wall expansion trap 31. It is orthogonal to the longitudinal direction of the intake channel 13 and is provided across the width direction of the intake channel 13.

  The baffle plate 34 is firmly fixed so as not to move due to the weight of the accumulated shellfish 51 and the flow of seawater. Further, the baffle plate 34 is provided so that the baffle plate upper surface 47 is lower than the sea level so as not to block the entire seawater channel.

  The baffle plate 34 is made of a material that does not corrode with seawater. In the present embodiment, the baffle plate 34 has a plate shape, but may have a dust-like shape in which a side plate and a bottom plate are further provided on the upstream side.

  By providing the baffle plate 34, overflow of the shellfish 51 in the side wall expansion trap 31 can be prevented to the height of the baffle plate 34. Moreover, the outflow of the shellfish 51 from the side wall expansion trap 31 can be prevented when the seawater flow velocity suddenly increases.

  In the water intake facility 5, a maintenance port 35 that can be used when collecting shellfish 51 is further provided in the intake channel ceiling portion 26 where the side wall expansion trap 31 is provided. The maintenance port 35 is provided in the intake channel ceiling 26 so that the worker can enter the intake channel 13. However, the maintenance port 35 and the side wall expansion trap 31 can be easily provided from the maintenance port 35 by providing the maintenance port 35 in the same place. The shellfish 51 can be collected.

  As mentioned above, although the water intake equipment of this invention was demonstrated by the water intake equipment 1, 2, 3, 4, 5 of 1st to 5th embodiment, this invention is not limited to the said embodiment, A summary is not changed. Various forms can be used within the range. For example, the bottom expansion trap 33 and the baffle plate 34 may be used in combination. The pump tank 12 may have the same width as the intake channel 13 or may have a linear shape. The intake channel 13 may have a U-shaped vertical section without the intake channel ceiling portion 26.

  In the above embodiment, the shape of the side wall expansion trap 31 is a trapezoidal shape, but the shape of the side wall expansion trap 31 may be a triangle, an arc shape, or the like as long as the seawater flow velocity can be locally reduced to catch shellfish. Further, the upstream inclined surface 42 and the downstream inclined surface 43 of the side wall expansion trap 31 may have different angles with respect to the intake channel side wall 24.

  In addition, when detecting means using an ultrasonic measuring device or the like for detecting the amount of shellfish 51 deposited on the side wall expansion traps 31, 31a, 31b, 31c, 32 is installed, the shellfish 51 reaches the amount to be collected An alarm may be issued.

  Further, a collecting device such as an underwater robot, an underwater pump or a prober for automatically collecting the shellfish 51 deposited on the side wall expansion traps 31, 31a, 31b, 31c, 32 may be installed so as to automatically collect the shellfish 51. Good. Even if the recovery device breaks down, the shellfish 51 is continuously captured and accumulated by the side wall expansion traps 31, 31a, 31b, 31c, and 32, so that it is not necessary to immediately stop the operation of the water intake equipment.

1, 2, 3, 4, 5 Intake equipment 11 Intake port 12 Pump tank 13 Intake path 21 Pump tank inlet 23 Circulation pump 24 Intake path side wall 25 Intake path bottom surface 31, 32 Side wall expansion trap 33 Bottom expansion trap 34 Baffle plate 41 Outside Bottom 42 Upstream inclined surface 43 Downstream inclined surface 47 Baffle plate upper surface 51 Shellfish

Claims (5)

In intake facilities including an intake port that is an intake port of seawater, a pump tank in which a circulation pump for water supply is installed, and an intake channel that connects the intake port and the pump tank,
A water intake facility characterized in that a concave side wall expansion trap that traps and deposits shellfish by locally lowering the seawater flow velocity is provided at an arbitrary location on the side wall of the intake channel.   The water intake facility according to claim 1, wherein the side wall expansion trap is provided immediately before the inlet of the pump tank and catches shellfish immediately before the inlet of the pump tank.   The water intake facility according to claim 1 or 2, wherein the side wall expansion trap has a trapezoidal shape in which the outer bottom is shorter than the inner bottom in plan view, and shells can be easily collected.   The concave bottom expansion trap for further increasing the amount of shellfish deposited is provided on the bottom surface of the intake channel where the side wall expansion trap is provided over the intake channel width direction. The water intake facility according to any one of the above.   Further, a baffle plate that prevents shells from flowing out is provided at the downstream end portion of the side wall expansion trap at right angles to the intake channel longitudinal direction and across the intake channel width direction, and the upper surface of the baffle plate is higher than the sea level height. The water intake equipment according to any one of claims 1 to 4, wherein the water intake equipment is low.

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