JP5631288B2 - Anti-foaming device - Google Patents

Description

  The present invention relates to a water discharge channel that discharges water into a river area or a sea area in a power plant or a chemical plant using nuclear power or thermal power, and a foam prevention device for preventing generation of bubbles in the water discharge channel.

  In various plants typified by nuclear power plants or thermal power plants, water discharge channels to river areas and sea areas are provided in order to discharge drainage water after taking water and being used for cooling water to river areas and sea areas. ing. In this spillway, a spillway pit is often constructed by installing a weir to absorb fluctuations in the open sea tide level and channel loss and prevent siphon breakage. In the water discharge channel in which such a water discharge pit is configured, bubbles are generated when the discharged water overflows the weir, and the bubbles cause various problems described below.

  Conventionally, as shown in FIG. 18 (a), the water discharge pipes 101a, 101b are provided on the upstream side and the downstream side of the water discharge pit 100 provided with the weir 100a as a water discharge path provided with a water discharge pit. As shown in FIG. 18 (b), there is a configuration in which a water discharge pipe 101 a is provided on the upstream side of the water discharge pit 100 and the downstream side of the water discharge pit 100 is an open channel. 18 (a) and 18 (b), air is entrained and bubbles are generated in the falling portion 102 where the waste water flows down the weir 100a of the water discharge pit 100.

  As shown in FIG. 18 (a), when the water discharge pipes 101a and 101b are provided on the upstream side and the downstream side of the water discharge pit 100, bubbles generated in the falling portion 102 of the weir 100a sink into the downstream water. Thus, it flows into the water discharge pipe 101b. As described above, air flows into the water discharge pipe 101b by the bubbles, so that not only the pressure loss in the water discharge pipe 101b increases, but also causes pulsation such as reverse injection into the water discharge pit 100. On the other hand, as shown in FIG. 18 (b), when the downstream side of the water discharge pit 100 is an open channel, not only the scenery is damaged by the foam generated in the falling part 102 of the weir 100a, but also the peripheral structure by the foam adhesion. It will cause pollution of things and fishing nets. In addition, when the open channel side is a sea area, salt damage may occur due to the scattering of bubbles to the equipment.

  Thus, in the conventional water discharge channel, there is a water falling part on the downstream side of the weir of the water discharge pit, and bubbles are generated in this water falling part, so various problems based on the bubbles arise. In order to prevent generation | occurrence | production of this bubble, the water discharge pit which provides a perforated board in a waterfall part, disperse | distributes a bubble, and discharges water from the bottom layer without a bubble is proposed (refer patent document 1). The water discharge pit has a structure in which a wall having an open bottom is provided on the downstream side of the weir and a perforated plate is provided between the weir and the wall. Furthermore, a sill that is an obstacle to weaken the momentum of the water flow of the falling water veins is installed on the upper surface of the perforated plate, thereby reducing the flow rate passing through the hole on the downstream side of the perforated plate close to the wall. Thereby, the penetration depth of the foam generated on the downstream side near the wall is made shallow, and the waste water with less foam is discharged.

Japanese Patent Laid-Open No. 2001-4787

  However, according to the structure of the water discharge pit of Patent Document 1, since a sill that becomes an obstacle in the falling water part is installed, the water flow of the falling water vein is weakened. May occur. And as mentioned above, salt damage will generate | occur | produce in the structure installed around the water discharge pit by the splash of this foam.

  On the other hand, when the sill is removed from the structure of the water discharge pit of Patent Document 1, since the upper surface of the perforated plate is installed at a height matching the top of the weir, most of the water flow beyond the weir is Reach the wall side. As a result, most of the drainage passes through the hole on the wall side of the perforated plate, and the momentum of the water flow on the wall side increases. Therefore, the penetration depth of bubbles generated on the downstream side close to the wall becomes deep, and a lot of bubbles are mixed into the drainage.

  In view of such a problem, an object of the present invention is to provide a foaming prevention device capable of reducing foam splashes and mixing of bubbles on the downstream side in a water discharge channel that discharges water into a river or sea area. To do.

In order to achieve the above object, the foam prevention device of the present invention is installed between a water tank for storing drainage discharged from an upstream discharge pipe and a downstream discharge area for discharging the drainage, In the foam prevention device for reducing foaming when draining the water stored in the water tank to the water discharge area, the water tank is deeper than the upstream first water tank and the upstream first water tank. a second water tank on the downstream side is composed of, the example Bei multiple water discharge tube second is through the bottom of the tank to discharge water drainage which is water in the tub together provided on the water discharge area, said plurality of The water discharge pipes have different lengths with respect to the depth direction of the water tank, and the height positions of the water supply ports at the top ends thereof are different, and the plurality of water discharge pipes are provided with throttles for restricting the flow rate of drainage flowing inside. The plurality of the second tanks Of water discharge pipe, characterized in that with respect to those height position of at least the water supply port is high, a cover for covering the water inlet is provided.

Further, the plurality of water discharge pipes provided in the second water tank are arranged in an order from the upstream side to the downstream side in which the water supply port is in a low position to the water supply port in a high position. It doesn't matter if it is done. Of the water supply ports of the plurality of water discharge pipes provided in the second water tank, the water supply port having the lowest height is stored in the second water tank even when the water discharge area is at the lowest water level. It may be located below the surface of the water.

  Furthermore, an inlet is connected to the outlet of the water discharge pipe provided in the second water tank in which the water supply port is at a high position, and a cyclone device for rotating and separating the drainage from the connected water discharge pipe, An air discharge pipe connected to the lid of the cyclone device and discharging the air separated by the cyclone device into the air may be provided.

  According to the anti-foaming device of the present invention, it is possible to reduce the splash of bubbles and the mixing of bubbles downstream in a water discharge channel that discharges water into a river or sea area.

It is a schematic sectional drawing which shows the structure of the water discharge channel of a 1st reference example. It is a top view of the water discharge channel of FIG. It is a schematic sectional drawing which shows the structure of the water discharge channel of a 2nd reference example. It is a top view of the water discharge channel of FIG. It is a schematic sectional drawing which shows the structure of the water discharge channel of the 3rd reference example. It is a schematic sectional drawing which shows another structure of the water discharge channel of a 3rd reference example. It is a figure which shows the state at the time of the high water level and low water level of the water discharge channel of FIG. It is a schematic sectional drawing which shows the structure of the water discharge channel of the 4th reference example. It is a schematic sectional drawing which shows the structure of the water discharge channel of the 5th reference example . It is a top view of the water discharge channel of FIG. It is a figure which shows the state in each step | level where the water level of the water discharge channel of FIG. 9 changed. It is a schematic sectional view showing a structure of a spillway of implementation forms. It is a figure which shows the relationship between the water discharge pipe and cover in the water discharge path of FIG. It is a schematic sectional drawing which shows the structure of the water discharge channel of the 6th reference example . It is a schematic sectional drawing which shows the structure of the water discharge channel of the 7th reference example. It is a figure which shows the state at the time of the high water level and low water level of the water discharge channel of FIG. It is a schematic sectional drawing which shows another structure of the water discharge channel of a 7th reference example. It is a schematic sectional drawing which shows the structure of the conventional water discharge channel.

< First Reference Example >
The first reference example concerning the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a water discharge channel configuration of the present reference example .

  The drainage channel shown in FIG. 1 includes a drainage pipe 1 that drains seawater or river water used as cooling water in a condenser of a power plant, an upstream water tank 2 that stores drainage from the drainage pipe 1, and an upstream A weir 3 that dams the downstream side of the side water tank 2, a downstream water tank 4 that is configured on the downstream side of the weir 3, and a wall 5 that is installed on the downstream side of the downstream water tank 4 and that opens at the bottom and opens downstream. And a perforated plate 6 that covers the downstream water tank 4 between the weir 3 and the wall 5 and includes a plurality of through holes 6a. That is, the upstream water tank 2 and the downstream water tank 4 function as a water discharge pit.

  Further, as shown in the top view of FIG. 2, the perforated plate 6 is configured as a perforated plate having a plurality of holes 6a penetrating perpendicularly to the water surface in a matrix, and as shown in FIG. It is installed at a position slightly lower than the top of No. 3. The wall 5 has a top end higher than the top end of the weir 3, and a lower end opposite to the top end is a height between the bottom of the downstream water tank 4 and the perforated plate 6. That is, the space between the lower end of the wall 5 and the bottom of the downstream water tank 4 is opened, and the wall 5 blocks the flow on the water surface side of the downstream water tank 4. The lower end of the wall 5 is set so that the water level in the water discharge area 7 on the downstream side of the wall 5 is higher than the position where the lowest water level is reached.

  By being configured in this way, the drainage discharged from the discharge pipe 1 is blocked by the weir 3 and temporarily stored in the upstream water tank 2, and the drainage that has passed over the weir 3 flows into the downstream water tank 4. At this time, the waste water that has passed over the weir 3 passes through the hole 6a of the perforated plate 6 and flows into the downstream water tank 4. However, since a step is provided between the perforated plate 6 and the weir 3, The excess drainage is dropped into the stepped portion near the weir 3. And while a part of drainage passes through the hole 6a near the dam 3 of the perforated plate 6 and flows into the downstream water tank 4, the remaining drainage flows on the surface of the perforated plate 6 toward the wall 5, 5 passes through the holes 6 a up to 5 and flows into the downstream water tank 4.

  In this way, a step is formed between the perforated plate 6 and the weir 3, so that the surface of the perforated plate 6 and the top of the weir 3 are at the same height as in the case of the wall. It is possible to prevent the flow of drainage from being biased toward the side 5 and to uniformly disperse the surface of the perforated plate 6. Therefore, when the drainage exceeds the weir 3, the flow is dispersed by the perforated plate 6 that covers the downstream water tank 4 between the weir 3 and the wall 5, and the water flow that is reduced through the hole 6 a of the perforated plate 6 is generated. It will flow into the downstream water tank 4.

  Therefore, the amount of water flowing into the downstream water tank 4 from the hole 6a of the perforated plate 6 can be reduced, and as a result, the penetration depth of bubbles by the air generated when exceeding the weir 3 can be reduced. it can. At this time, the width of the step between the weir 3 and the perforated plate 6 is increased in order to reduce the amount reaching the wall 5 as the discharge channel has a larger flow rate of drainage from the drainage channel 1. Even when the aperture ratio of the perforated plate 6 is small, the step width between the weir 3 and the perforated plate 6 is increased in order to reduce the amount reaching the wall 5.

  And the waste water which flowed down to the downstream water tank 4 through the perforated plate 6 flows into the water discharge area 7 downstream from the wall 5 from the open part between the lower end of the wall 5 and the bottom of the downstream water tank 4. . At this time, as described above, in the downstream water tank 4, the bubbles (air) flowing in along with the drainage that has passed through the perforated plate 6 and the flow is dispersed can reach a position deeper than the lower end of the wall 5. Few. Therefore, the amount of bubbles (air) flowing into the water discharge area 7 beyond the position deeper than the lower end of the wall 6 can be suppressed. In addition, since the drainage flows through the entire surface of the perforated plate 6 and the obstructed plate 6 is not provided with an obstacle, the amount of generated foam can be suppressed.

< Second Reference Example >
A second reference example relating to the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing the configuration of the water discharge channel of this reference example . In the configuration shown in FIG. 3, portions used for the same purpose as the configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the water discharge channel shown in FIG. 3, the water discharged from the water discharge pipe 1 is temporarily stored in the upstream water tank 2, and the water discharged over the weir 3 is the hole of the perforated plate 6, as shown in FIG. 1. It is dispersed by 6a and flows into the downstream water tank 4. At this time, the amount of bubbles (air) entrained in the downstream water tank 4 can be reduced as compared with the conventional case, but bubbles (air) are entrained in the downstream water tank 4 and a part thereof flows into the water discharge area 7. It will end up. Therefore, in this reference example, it is set as the structure which collect | recovers the foam (air) which is going to flow into the water discharge area 7, and discharges it in the air.

  That is, the water discharge channel shown in FIG. 3 is different from that shown in FIG. 1 and extends to the water discharge area 7 side at the lower end of the wall 5a with the air vent pipe 8a penetrating in the direction perpendicular to the water surface. And an air recovery unit 8 for enclosing. The air recovery unit 8 is configured by a U-shaped cross-sectional shape having an open surface facing the bottom of the downstream water tank 4, and the upstream side surface is flush with the upstream side surface of the wall 5 a and is downstream from the wall 5 a. It is set as the structure extended to the water discharge area 7. Moreover, the air collection | recovery part 8 is provided with the hole connected with the air vent pipe 8a provided in multiple numbers along the wall 5a like the top view of FIG. 4 in the part connected with the lower end of the wall 5a.

Also in the water discharge channel (see FIG. 1) of the first reference example , when the waste water that has passed over the weir 3 is dispersed by the holes 6a of the perforated plate 6 and flows into the downstream water tank 4, a small amount of foam (air) is generated. Although it is somewhat involved, it tries to flow into the water discharge area 7 on the downstream side of the wall 5 from the lower side of the lower end of the wall 5 together with the drainage. On the other hand, in the water discharge channel of this reference example , since the air recovery unit 8 is provided on the wall 5a, when drainage flows through the lower side of the air recovery unit 8 to the water discharge area 7 on the downstream side of the wall 5a. The bubbles (air) flowing in along with the waste water are captured by the air recovery unit 8.

  And if a bubble (air) moves to the upper surface side of the air collection | recovery part 8, it will be discharge | released in the air through the air vent pipe 8a which penetrated the wall 5a and was connected to the air collection | recovery part 8. FIG. In this way, by providing the air recovery section 8 and the air vent pipe 8a, the bubbles (air) that are about to flow into the water discharge area 7 can be caught and discharged into the air, and the bubbles that flow into the water discharge area 7 can be discharged. The amount of (air) can be reduced.

< Third reference example >
A third reference example relating to the present invention will be described with reference to the drawings. FIG. 5 is a cross-sectional view showing the configuration of the water discharge channel of this reference example . In the configuration shown in FIG. 5, portions used for the same purpose as the configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the water discharge channel shown in FIG. 5, as shown in FIG. 1, instead of the perforated plate 6 fixedly supported by the weir 3 and the wall 5, the floating body floats on the surface of the water stored in the downstream water tank 4. A perforated plate 6x made of a structure is provided. The perforated plate 6x is sandwiched between the weir 3 and the wall 5, but its height position varies depending on the water level of the water discharge area 7, in other words, depending on the water level of the downstream water tank 4. . That is, as shown in FIG. 5 (a), when the water discharge area 7 is at a low water level, the perforated plate 6x moves to a low position accordingly, and the step with the top of the weir 3 becomes large. As shown in FIG. 5B, when the water discharge area 7 is at a high water level, the perforated plate 6x is moved to a higher position accordingly, and the step difference from the top of the weir 3 is reduced. Therefore, since the space between the perforated plate 6x and the water surface of the water stored in the downstream water tank 4 can be eliminated, entrainment of bubbles generated by this space can be suppressed.

Also in this reference example , as shown in FIG. 1, the drainage discharged from the drainage pipe 1 is temporarily stored in the upstream water tank 2, and the drainage beyond the weir 3 passes through the hole of the perforated plate 6x. It is dispersed by 6a and flows into the downstream water tank 4. At this time, as described above, since the lower surface of the perforated plate 6x is in contact with the water surface of the downstream water tank 4, the generation of bubbles on the lower surface of the perforated plate 6x can be suppressed. Then, the waste water flowing into the downstream water tank 4 passes through the lower side of the lower end of the wall 5 and is discharged into the water discharge area 7 on the downstream side of the wall 5.

In addition, in this reference example , since the perforated plate 6x always floats on the water surface of the downstream water tank 4, when the water discharge area 7 becomes the lowest water area, the water surface does not become lower than the wall 5. At the same time, when the water discharge area 7 becomes the highest water area, the water surface is set at a position that does not become higher than the weir 3.

Further, in this reference example , as shown in FIG. 6, the stoppers 3 b, 3 c, 5 b, and 5 c provided on the weir 3 and the wall 5 so as to protrude above and below the surface facing the downstream water tank 4 are provided. You may make it prepare. That is, when the water discharge area 7 is at a high water level, the perforated plate 6x is brought into contact with the stoppers 3b and 5b provided on the upper sides of the weir 3 and the wall 5 as shown in FIG. The step between the weir 3 and the perforated plate 6x can be prevented from becoming small. On the other hand, when the water discharge area 7 is at a low water level, the perforated plate 6x is brought into contact with the stoppers 3c and 5c provided below the weir 3 and the wall 5 as shown in FIG. 7B. Thus, an increase in the level difference between the weir 3 and the perforated plate 6x can be prevented.

< Fourth Reference Example >
A fourth reference example relating to the present invention will be described with reference to the drawings. FIG. 8 is a cross-sectional view showing the configuration of the water discharge channel of this reference example . In the configuration shown in FIG. 8, portions used for the same purpose as the configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the water discharge channel shown in FIG. 8, compared to the configuration shown in FIG. 1, a diving weir 9 that dives below the water surface on the downstream side of the wall 5, and a water discharge area 7 and a partition on the downstream side of the diving weir 9. And a water tank 11 for levitating air mixed between the walls 5 and 10. That is, a water tank 11 whose water surface side is further partitioned by another wall 5, 10 is formed on the downstream side of the downstream water tank 4, and a submerged weir 9 whose top end is always below the water surface is provided in the water tank 11. . Further, the wall 10 is installed such that the top and bottom ends thereof are in the same positions as the top and bottom ends of the wall 5.

  By configuring in this way, in the water tank 11 where the water surface side is partitioned by the walls 5, 10, the flow of drainage flowing from the downstream water tank 4 is forcibly changed upward by the diving weir 9 toward the water surface side. It is done. Therefore, since the foam (air) that has flowed together with the drainage from the downstream water tank 4 is directed toward the water surface along the flow of the drainage affected by the return weir 9, the rising of the foam (air) to the water surface is promoted. be able to.

And if the foam (air) which flowed with the waste_water | drain from the downstream water tank 4 in the water tank 11 is discharge | released in the air, the waste_water | drain with which the mixing amount of foam (air) reduced passes the lower side of the wall 10, and the wall 10 The water is discharged into the water discharge area 7 on the downstream side. Therefore, in this reference example , the diving weir 9 is provided in the water tank 11, and the amount of foam (air) released into the air is increased by flowing the foam (air) that flows along with the drainage toward the water surface. Drainage in which the amount of (air) is reduced can be discharged into the discharge area 7.

In addition, you may combine each structure in a 2nd-4th reference example . That is, for the water discharge channel of the second reference example , as in the third reference example , a perforated plate 6x whose height position changes according to the water level of the water discharge area 7 may be provided. Moreover, it is good also as a structure which added the diving dam 9 and the wall 10 of the downstream side like the 4th reference example with respect to the water discharge channel of the 2nd and 3rd reference examples .

< Fifth Reference Example >
A fifth reference example of the present invention will be described with reference to the drawings. FIG. 9 is a cross-sectional view showing the configuration of the water discharge channel of this reference example .

  The drainage channel shown in FIG. 9 includes a drainage pipe 1 that drains seawater or river water used as cooling water in a condenser of a power plant, a water tank 20 that stores drainage from the drainage pipe 1, and a drainage area 7. On the other hand, the water discharge pipes 21a-21c which guide drainage from the tank 20 to the water discharge area 7 are provided. And the water tank 20 is comprised by the upstream water tank 20a (1st water tank) and the downstream water tank 20b (2nd water tank), and the bottom part of the upstream water tank 20a is in a position higher than the bottom part of the downstream water tank 20b, The bottom of the downstream water tank 20 b is located higher than the bottom of the water discharge area 7. Furthermore, a wall 20c is formed on the downstream side of the downstream water tank 20b, so that a partition from the water discharge area 7 is configured by the bottom of the downstream water tank 20b and the wall 20c.

  Further, the water discharge pipes 21a to 21c installed so as to penetrate through the holes provided in the bottom of the downstream water tank 20b are in the order of the water discharge pipes 21a, 21b, and 21c, and the length thereof is long. It is installed so as to be perpendicular to it. And it installs so that the drain outlet of the water discharge pipes 21a-21c may become the same position in the position lower than the bottom part of the downstream water tank 20b. That is, the water supply port of the water discharge pipe 21a is at the lowest position, the water supply port of the water discharge pipe 21c is at the highest position, and the water supply opening of the water discharge pipe 21b is the position therebetween. Further, the water discharge pipes 21a to 21c are provided with throttles 21x to 21z for restricting the flow rate of the waste water flowing through the water discharge pipes 21a to 21c, and resistance is given to the waste water flowing through the water discharge pipes 21a to 21c. It is said.

  And as shown in the top view of FIG. 10, the water discharge pipes 21a-21c are arrange | positioned at the matrix form arranged vertically and horizontally with respect to the downstream water tank 20b. Further, with respect to the direction in which the drainage flows, the water discharge pipe 21a is arranged on the side close to the upstream water tank 20a, the water discharge pipe 21c is arranged on the side close to the wall 20c, and the water discharge pipes 21a and 21c are arranged. The water discharge pipe 21b is arranged at the position. That is, the water discharge pipes 21a to 21c are arranged in the order of the water discharge pipes 21a, 21b, and 21c so that the water supply ports are positioned higher toward the downstream side.

  When comprised in this way, when the water discharge area 7 is a high water level, as shown to Fig.11 (a), also in the water tank 20, it becomes a high water level, and in the downstream water tank 20b, all the water supply pipes 21a-21c water inlet Will be located below the surface of the wastewater stored in the water tank 20. Therefore, the drainage discharged from the water discharge pipe 1 is discharged into the water discharge area 7 through all the water discharge pipes 21a to 21c installed in the downstream water tank 20b. Therefore, the waste water flow rate discharged from the upstream water tank 20 to the downstream water discharge area 7 increases.

  Further, when the water discharge area 7 has a lower water level than in the case of FIG. 11 (a), and the water level in the water tank 20 is lower than that in FIG. 11 (a) as shown in FIG. 11 (b), In the downstream water tank 20b, the water supply ports of the water discharge pipes 21a and 21b are located below the surface of the wastewater stored in the water tank 20, and the water supply opening of the water discharge pipe 21c is located on the water surface of the drainage. Therefore, the drainage discharged from the water discharge pipe 1 is discharged into the water discharge area 7 through the water discharge pipes 21a and 21b installed in the downstream water tank 20b. Therefore, the amount of drainage discharged from the upstream water tank 20 to the downstream water discharge area 7 is smaller than in the case of FIG.

  Further, when the water discharge area 7 has a lower water level than in the case of FIG. 11 (b) and the water level in the water tank 20 is lower than that in FIG. 11 (b) as shown in FIG. 11 (c), In the downstream water tank 20b, the water supply port of the water discharge pipe 21a is positioned below the surface of the drainage water stored in the water tank 20, and the water supply ports of the water discharge pipes 21b and 21c are positioned above the water surface of the drainage. Therefore, the drainage discharged from the water discharge pipe 1 is discharged into the water discharge area 7 through the water discharge pipe 21a installed in the downstream water tank 20b. Therefore, the flow rate of drainage discharged from the upstream water tank 20 to the downstream water discharge area 7 is further smaller than in the case of FIG.

  Thus, by changing the water level in the water discharge area 7, the water level in the water tank 20 is changed. With the change in the water level, the number of the water discharge pipes 21 a to 21 c through which the drainage passes is changed. The amount of discharged water can be changed. That is, when the water level is high, the amount of discharged water from the water tank 20 is increased, and when the water level is low, the amount of discharged water from the water tank 20 is decreased. Thereby, compared with the change of the water level in the water discharge area 7, the change of the water level of the water tank 20 can be made small. That is, by using the water discharge pipes 21a to 21c having different lengths, the water level fluctuation in the water tank 20 due to the influence of the water discharge area 7 can be absorbed by the water discharge pipes 21a to 21c.

  And in the water tank 20, since drainage flows into the water discharge pipe in which the water supply port is under the water surface among the water discharge pipes 21a to 21c, in the part which guides the waste water from the water tank 20 to the water discharge area 7, the contact part with air is almost Can be eliminated. Moreover, since each of the water discharge pipes 21a to 21c is provided with the throttles 21x to 21z inside as described above, backflow is prevented. In addition, the water supply port of the water discharge pipe 21a is installed so as to be located below the water surface in the water stored in the water tank 20 even when the water discharge area 7 reaches the lowest water level.

Furthermore, in this reference example , in the water discharge pipes 21a to 21c, the water discharge pipe 21c having a high water supply port is installed on the wall 20c side, and the water discharge pipe 21a in the low water supply port is installed on the upstream water tank 20a side. As shown, the water supply port is arranged so as to become higher toward the downstream side.
However, the arrangement of the water discharge pipes 21 a to 21 c is not limited to the arrangement shown in FIG. 9, and the water supply ports may be randomly set. In addition, like this embodiment, by increasing the water supply port in order toward the downstream side, the water discharge pipe of the high water supply port that does not introduce drainage at a low water level is the drainage pipe of the low water supply port that introduces drainage. There is no upstream side. Therefore, in any water level, since the water discharge pipe itself does not become an obstacle until the water supply port, generation of bubbles can be suppressed.

<Implementation form>
For implementation of the invention will be described with reference to the drawings. FIG. 12 is a cross-sectional view showing the configuration of the water discharge channel of the present embodiment. In the configuration shown in FIG. 12, parts used for the same purpose as those in the configuration shown in FIG. 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the water discharge channel shown in FIG. 12, covers 22 a to 22 c that cover the respective water supply ports are installed in the water discharge pipes 21 a to 21 c with respect to the configuration shown in FIG. 9. That is, in the configuration shown in FIG. 9, when the water level in the water tank 20 coincides with the position in the vicinity of the water supply port of the water discharge pipes 21 a to 21 c, air is sucked in along with the drainage at the water supply port and becomes a generation source of bubbles. . On the other hand, as shown in FIG. 12, since the water supply ports of the water discharge pipes 21a to 21c are respectively covered with the covers 22a to 22c, when the water level becomes a position near the water supply port, air flows from the water supply port. Can be prevented.

  The relationship between the water discharge pipes 21a to 21c and the covers 22a to 22c is shown in FIG. In addition, in FIG. 10, the water discharge pipe 21 shows the water discharge pipes 21a-21c of FIG. 12, and the cover 22 shows the covers 22a-22c of FIG. The cover 22 is located above the water supply port of the water discharge pipe 21 and covers the water supply port 22x, and the side surface 22y of the shape extending from the cover surface 22x and the outer periphery to a position below the water supply port of the water discharge pipe 21; Consists of. In order to cover the water supply port of the water discharge pipe 21 with the cover 22 having such a shape, the space between the cover 22 and the water discharge pipe 21 is narrowed, and the water level of the water tank 20 becomes near the water supply port of the water discharge pipe 21. Sometimes the amount of air inhaled can be reduced.

  In addition, in this embodiment, about the water discharge pipe 21a in which a water supply opening is installed in the lowest position, even when the water discharge area 7 becomes the lowest water level, the water supply opening of the water discharge pipe 21a is lower than the water level of the water tank 20. It is installed so that it is located. Thereby, the water supply port of the water discharge pipe 21a can always be located below the surface of the water stored in the water tank 20. At this time, since the water supply port of the water discharge pipe 21a does not touch the air, the cover 22a may not be installed.

< Sixth Reference Example >
A sixth reference example of the present invention will be described with reference to the drawings. FIG. 14 is a cross-sectional view showing the configuration of the water discharge channel of the present reference example . In the configuration shown in FIG. 14, portions used for the same purpose as the configuration shown in FIG. 9 are given the same reference numerals, and detailed description thereof is omitted.

  In the water discharge channel shown in FIG. 14, only the water discharge pipes 21 a and 21 c except for the water discharge pipe 21 b are arranged with respect to the structure shown in FIG. 9, and the water supplied from the water discharge pipe 21 c is spirally formed. Are provided with a cyclone device 23 that separates the air from the drainage by swirling the air and an air discharge pipe 24 that discharges the air separated by the cyclone device 23 into the air. At this time, the inlet 23a of the cyclone device 23 is connected to the drain of the water discharge pipe 21c. Moreover, about the water discharge pipe 21a, even when the water discharge area 7 becomes the lowest water level, it is installed so that the water supply port of the water discharge pipe 21a is located at a position lower than the water level of the water tank 20.

When configured in this way, as in the case of the configuration of FIG. 9, when the water level of the water discharge area 7 is low, the wastewater stored in the water tank 20 flows only from the water discharge pipe 21 a into the water discharge area 7. When the water level of 7 is high, the drainage water stored in the water tank 20 flows into the water discharge area 7 from each of the water discharge pipes 21a and 21c. At this time, when the water level of the water tank 20 becomes the water supply port position of the water discharge pipe 21c, as described in the above embodiment, air is sucked together with the drainage by the water discharge pipe 21c.

  However, in this embodiment, as shown in FIG. 14, the cyclone device 23 is installed, so that wastewater mixed with air is discharged to the cyclone device 23 through the water discharge pipe 21 c. And in the cyclone apparatus 23, the mixed air will be isolate | separated because the waste_water | drain with which the air from the water discharge pipe 21 mixed turns and goes to the exit 23b. The separated air is directed to the upper part of the cyclone device 23 and discharged into the air from an air discharge pipe 24 connected to the center of the lid of the cyclone 23.

The air discharge pipe 24 is provided so as to penetrate the bottom of the downstream water tank 20b, and its top end is set to a position higher than the highest water level of the drainage stored in the water tank 20. At this time, by installing the top end of the air discharge pipe 24 at a position higher than the top end of the wall 20 c of the water tank 20, the air discharge pipe 24 can be always positioned higher than the water level of the wastewater stored in the water tank 20. Moreover, the water discharge pipes 21a and 21c are arranged in a matrix form arranged in the water tank 20 vertically and horizontally, similarly to the fifth reference example . The cyclone device and the air discharge pipe 24 may be provided for each of the plurality of water discharge pipes 21c, or one cyclone device and the air discharge pipe 24 may be provided for the plurality of water discharge pipes 21c. I do not care.

In addition, in this reference example , you may provide the cover 22a and 22c for covering a water supply port in each water supply port of the drain pipes 21a and 21c similarly to the said embodiment. In this reference example , a drainage pipe is provided in which the height of the water supply port is between the heights of the water supply ports of the drainage pipes 21a and 21c. A discharge pipe may be installed.

In the fifth reference example, the present reference example, and the above-described embodiment, two or three types of drain pipes 21a to 21c having different lengths are installed, but the control on the water level is fine. Therefore, four or more types of drain pipes may be installed. In addition, as described in the fifth reference example , the arrangement method for the drain pipes having different lengths is not limited to the method of installing the water supply port so as to increase toward the downstream side, but may be installed at random. I do not care.

< Seventh Reference Example >
A seventh reference example relating to the present invention will be described with reference to the drawings. FIG. 15 is a cross-sectional view showing the configuration of the water discharge channel of this reference example.

  The drainage channel of FIG. 15 includes a drainage pipe 1 for draining seawater or river water used as cooling water in the condenser of the power plant, an upstream water tank 30 for storing drainage from the drainage pipe 1, and an upstream side A weir 31 that dams the downstream side of the water tank 30, a downstream water tank 32 that is configured on the downstream side of the weir 31, and a U-shaped siphon pipe 33 that discharges the wastewater stored in the downstream water tank 32 to the water discharge area 7. And a water discharge pipe 34 inserted through the weir 31 from the upstream water tank 30 and inserted into the siphon pipe 33 of the downstream water tank 32.

  At this time, the bottom 30 a of the upstream water tank 30 is at a position higher than the bottom 32 a of the downstream water tank 32, and the bottom 32 a of the downstream water tank 32 is at a position higher than the bottom of the water discharge area 7. And the downstream water tank 32 becomes the structure discharged into the water discharge area 7 by the bottom part 32a and the wall 32b. Moreover, when the water level of the upstream water tank 30 becomes high because the water discharge area 7 becomes a high water level, the top end of the weir 31 becomes a low position below the water surface, and conversely, the water discharge area 7 becomes a low water level. Thus, when the water level of the upstream water tank 30 becomes low, its height is set so that its top end is higher than the water surface.

  The siphon pipe 33 is installed in the downstream water tank 32 and has an upstream pipe 33a having a tapered opening with respect to the bottom 32a, and a drain outlet that is installed in the water discharge area 7 and serves as a lower end from the bottom 32a. The downstream side pipe 33b which becomes a low position, and the U-shaped pipe 33c which connects the upstream side pipe 33a and the downstream side pipe 33b across the wall 32b are comprised. When the siphon tube 33 is initially installed, the siphon tube 33 is filled with water by removing air with a vacuum pump. By configuring the siphon pipe 33 in this way, the water supply port of the upstream side pipe 33 a is positioned higher than the drain port of the downstream side pipe 33 b, and the drainage of the downstream water tank 32 is discharged into the water discharge area 7 through the siphon pipe 33. Will be.

  Further, the water discharge pipe 34 provided so as to penetrate the weir 31 is provided on the bottom 30a side of the upstream water tank 30, and penetrates the wall of the upstream pipe 33a of the siphon pipe 33 to be inserted into the upstream pipe 33a. Is done. And the front-end | tip of the water discharge pipe 34 inserted in the upstream pipe 33a is made into a shape bent toward the bottom part 32a of the downstream water tank 32, and the drain of this water discharge pipe 34 is the water supply of the upstream pipe 33a. It is installed to be higher than the mouth.

  When configured in this way, when the water discharge area 7 is at a low water level, the water level of the downstream water tank 32 is lowered and the water level is higher than the top of the weir 31 in the upstream water tank 30 as shown in FIG. Becomes low, and the drainage cannot pass over the weir 31. In the downstream water tank 32, the water level is higher than the water discharge pipe 34, and the water discharge pipe 34 exists below the surface of the water stored in the downstream water tank 32. At this time, the waste water from the upstream water tank 30 is discharged into the upstream pipe 33 a of the siphon pipe 33 in the downstream water tank 32 through the water discharge pipe 34.

  And in the upstream side pipe 33a of the siphon pipe 33, the drainage is discharged from the water discharge pipe 34. The direction in which the water is discharged is the direction toward the water supply port of the upstream side pipe 33a, and the upstream side pipe 33a is connected to the upstream side pipe 33a. On the opposite side to the direction of flow. That is, drainage is discharged from the water discharge pipe 34 so as to flow backward to the water flow in the upstream pipe 33a, and resistance is given to water discharge from the water discharge pipe 34. Thereby, in order to reduce the flow volume of the waste_water | drain discharged from the water discharge pipe 34, the water level fluctuation | variation in the upstream water tank 30 can be suppressed. In the siphon pipe 33, the wastewater stored in the downstream water tank 32 is supplied from the upstream pipe 33a and then discharged from the downstream pipe 33b to the water discharge area 7 through the U-shaped pipe 33c.

  Further, when the water discharge area 7 is at a high water level, as shown in FIG. 16 (b), the water level of the downstream water tank 32 rises, and the water level becomes higher in the upstream water tank 30 than the top of the weir 31. The drainage passes over 31 and flows into the downstream water tank 32. Therefore, although the amount of drainage stored in the downstream water tank 32 increases, the flow rate of drainage flowing through the siphon pipe 33 to the water discharge area 7 increases. Thus, since the flow volume of the waste_water | drain which flows into the discharge area 7 through the siphon pipe 33 increases, it can suppress that the water level of the upstream water tank 30 and the downstream water tank 32 rises too much, and makes the water level fluctuation | variation small. be able to.

In this reference example , since the waste water is discharged to the water discharge area 7 through the siphon tube 33, it is possible to prevent bubbles (air) from being mixed into the water discharged to the water discharge area 7. Further, by providing the water discharge pipe 34 inserted from the upstream water tank 30 to the inside of the upstream pipe 33a of the siphon pipe 33, the downstream water tank 32 even when the water discharge area 7 becomes a low water level and the water level is lowered as a whole. It can be set as the structure by which waste water is supplied to. Thereby, the siphon tube 33 can be in a state always filled with drainage, and air can be prevented from being mixed.

In this reference example , the water discharge pipe 34 is inserted into the upstream pipe 33a of the siphon pipe 33 and bent to give resistance, thereby reducing the flow rate of drainage discharged from the water discharge pipe 34, and at a low water level. Although the fluctuation of the water level is suppressed, as shown in FIG. 17, the drain outlet of the water discharge pipe 34 may be outside the upstream pipe 33a. At this time, resistance is provided by narrowing the drain outlet of the water discharge pipe 34. However, if the drain outlet is narrow, the drain outlet may be clogged with impurities, organisms, etc., so as shown in FIG. It is preferable to provide resistance by inserting and bending inside 33a.

INDUSTRIAL APPLICABILITY The present invention can be applied to a water discharge channel for discharging water taken from a river area or sea area and used as cooling water in a power plant or chemical plant using nuclear power or thermal power.

1 Water discharge pipe 7 Water discharge area 20 Water tank 20a Upstream water tank (first water tank)
20b Downstream water tank (second water tank)
21a Water discharge pipe 21b Water discharge pipe 21c Water discharge pipe 22 Cover 23 Cyclone device

Claims (4)

When the wastewater stored in the water tank is discharged from the water tank to the water discharge area, which is installed between the water tank for storing the water discharged from the upstream discharge pipe and the downstream water discharge area for discharging the waste water. In an anti-foaming device that reduces foaming of
The water tank is composed of an upstream first water tank and a downstream second water tank deeper than the upstream first water tank,
A plurality of water discharge pipes that are provided through the bottom of the second water tank and discharge water stored in the water tank to the water discharge area;
The plurality of water discharge pipes have different lengths with respect to the depth direction of the water tank, and the height position of the water supply port at the top of the water tank is different.
The plurality of water discharge pipes are provided with throttles for reducing the flow rate of drainage flowing through the inside,
The second of the plurality of water discharge pipe provided in the water tank, at least the relative ones height position of the water supply port is high, the water supply port foamed prevention device you characterized in that the cover is provided for covering the. The plurality of water discharge pipes provided in the second water tank are arranged in order from the upstream side to the downstream side in which the water supply port is at a low position from the low water supply port. The anti-foaming device according to claim 1 . Of the water supply ports of the plurality of water discharge pipes provided in the second water tank, the water supply port having the lowest height is the water stored in the second water tank even when the water discharge area is at the lowest water level. The anti-foaming device according to claim 1 , wherein the anti-foaming device is located below the water surface. A cyclone device in which an inlet is connected to a discharge port of the water discharge pipe provided in the second water tank in which the water supply port is at a high position, and the waste water from the connected water discharge pipe is swirled and separated from the air;
An air discharge pipe connected to the lid of the cyclone device and discharging the air separated by the cyclone device into the air;
The anti-foaming device according to any one of claims 1 to 3 , further comprising:

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