JP2001329520A - Tailrace facilities and discharge method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide tailrace facilities and discharge method capable of discharging water without generating bubbles in discharging used sea water to the sea at a low cost. SOLUTION: In the tailrace facilities 1 for discharging used sea water 50 or the like from an upstream discharge channel 3 having a difference in level H from the sea level Ws through a stepped part 4 and a downstream discharge channel to the sea S, an outlet 6 of the downstream discharge channel 5 is provided with a water level adjusting means 7 for raising the water level formed at the stepped part 4 about the water surface of the upstream discharge channel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent bubbles generated by dropping of seawater or the like at a step portion of a water discharge channel when used seawater or the like is flowed into a water discharge channel having a drop from the sea surface and discharged into the sea. The present invention relates to a water discharge facility and a water discharge method for discharging water while discharging.

[0002]

2. Description of the Related Art Seawater or the like is used as a heat source water for a vaporizer in an LNG (liquefied natural gas) facility and as a cooling water in a power generation facility.

[0005] As shown in FIG. 5, used seawater 50 and the like used in these facilities are discharged to a discharge channel 51 to be discharged to the sea S.
The water is discharged. More specifically, used seawater 50
Are discharged from the upstream water discharge channel 52 having a drop from the sea surface Ws, fall at the step 53, and become the downstream water discharge channel 54.
From the water discharge port 55 to the sea S.

[0004] Seawater and the like used in facilities often contain dirt by nature, and a large amount of bubbles 56 are generated when used seawater 50 or the like falls on the step 53 of the water discharge channel 51. This foam 56 is released from the downstream water discharge channel 54 to the sea S, and drifts in a strip over a wide range of sea from the coast to the offshore.
May be problematic.

Therefore, conventionally, used seawater 50 or the like is passed through a water discharge channel 61 of a water discharge facility 60 as shown in FIG.
It has been done to discharge water. More specifically,
The used seawater 50 and the like are caused to flow from the upstream water discharge channel 62 having a drop from the seawater surface Ws, and fall at the step portion 63,
The water is drained to the midstream discharge channel 64 and temporarily stored in the pond 65 and the like.
When the bubbles 67 generated in the step portion 63 accumulate on the pond 65, the water is sprayed from a water discharge gun or the like toward the surface of the pond 65 to remove the bubbles, and then the water is discharged from the downstream water discharge channel 66 to the sea S. I have to.

[0006] Surveillance cameras and the like are installed around the pond 65, and an observer or the like constantly monitors the image of the pond 65 taken by the camera and sprays water with a water spray gun.

[0007]

However, in the conventional water discharge facility 60, there is a problem that the bubbles 67 cannot be completely eliminated, and a problem that it is necessary to constantly monitor the pond 65 by an observer or the like. .

Accordingly, an object of the present invention is to provide a low-cost water discharge facility and a water discharge method which can discharge water without generating bubbles when discharging used seawater or the like into the sea.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the invention of claim 1 is directed to the use of used seawater or the like from an upstream spillway having a drop from the sea surface. In the water discharge facility for discharging water from the downstream water discharge channel to the sea through the step, the water level formed at the water discharge port of the downstream water discharge channel is increased to near the water surface of the upstream water discharge channel. It is a water discharge facility provided with adjustment means.

According to a second aspect of the present invention, the water level adjusting means includes:
2. The water discharge facility according to claim 1, comprising a flap openably and closably provided at an upper portion of the water discharge port, wherein the water discharge port is closed by its own weight and opened according to a water level formed in the step portion.

According to a third aspect of the present invention, a floating body is attached to the outer lower end of the flap via a rope, and a water level resistance of the flap, which fluctuates due to a difference in tide, is adjusted by the buoyancy of the floating body. It is the water discharge facility described.

According to a fourth aspect of the present invention, the water level adjusting means includes:
2. The water discharge facility according to claim 1, comprising a water turbine, wherein a downstream water discharge channel is closed at a lower portion of the water wheel, and the water is discharged according to the water level of the step portion to rotate the seawater or the like.

According to a fifth aspect of the present invention, there is provided a water discharge method for discharging used seawater or the like from an upstream water discharge channel having a drop from the seawater surface to a sea from a downstream water discharge channel through a step. Adjust the water discharge amount of the downstream water discharge channel so that the water level formed in the water rises near the water surface of the upstream water discharge channel, and discharge water while preventing bubbles generated by falling of seawater etc. from the upstream water discharge channel to the step It is a water discharge method.

According to the above construction, when the water level formed at the step does not exceed the drop between the water surface of the upstream water discharge channel and the sea water surface, the water level adjusting means closes the water discharge port to remove used seawater or the like. Block the flow and raise the water level formed at the step to near the water surface of the upstream discharge channel. In addition, the water level adjusting means opens the water outlet when the water level formed at the stepped portion is equal to or higher than the head, so that when discharging used seawater etc. to the sea, it is possible to discharge water without generating bubbles. it can.

[0015]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a water discharge facility according to a preferred embodiment of the present invention.

As shown in FIG. 1, a water discharge facility 1 according to the present invention.
Is provided in a water discharge channel 2 for discharging used seawater 50 and the like to the sea S.

The water discharge channel 2 has a rectangular cross section, for example. The water discharge channel 2 is located between the sea surface Ws and the head H
An upstream water discharge channel 3, a step portion 4 formed vertically below the upstream water discharge channel 3, and a downstream water discharge channel 5 provided underground. At the tip of the downstream water discharge channel 5,
A water outlet 6 leading to the sea S is formed.

The used seawater 50 and the like are caused to flow from the upstream water discharge channel 3, and there is a drop H between the water surface W of the upstream water discharge channel 3 and the seawater surface Ws, and the seawater 50 and the like pass through the step portion 4. Then, water is discharged from the water discharge port 6 of the downstream water discharge channel 5 to the sea S.

In the water discharge facility 1 of the present invention, the water level formed at the water discharge port 6 of the downstream water discharge channel 5, the water discharge port 6 is closed by its own weight, and the water level formed at the step portion 4 is changed to the water surface W of the upstream water discharge channel 3. It is provided with a water level adjusting means 7 which raises the water level to near.

As the water level adjusting means 7, for example, a flap 8 having a substantially flat plate as a whole is used. Flap 8
May be formed in any shape as long as the water outlet 6 can be closed. The upper end of the flap 8 serves as a hinge attachment portion 9. The flap 8 is, for example,
A hinge 10 is provided on the upper part of the water outlet 6 so as to be freely opened and closed.

The weight of the flap 8 is set so that the water outlet 6 is closed when the water level formed in the stepped portion 4 does not exceed the head H, and when the water level becomes equal to or higher than the head H, the water outlet 6 is closed. Make it open.

The operation of this embodiment will be described.

When the water level formed in the step portion 4 does not exceed the drop H between the water surface W of the upstream water discharge channel 3 and the sea surface Ws, the flap 8 closes the water discharge port 6 by its own weight and uses the used seawater. Gives resistance to a flow of 50 mag. And the flap 8
Since the water level formed in the step portion 4 is raised to near the water surface W of the upstream water discharge channel 3, the used seawater 50 and the like used in the step portion 4 do not fall. Therefore, the water discharge facility of the present invention can discharge the used seawater 50 and the like to the sea S without generating bubbles.

Further, when the water level formed in the step portion 4 becomes equal to or higher than the head H, the flap 8 tilts toward the sea S side by the water pressure and opens the water discharge port 6 by itself. As described above, when the flap 8 is used as the water level adjusting means 7, the water discharge facility 1 of the present invention does not require monitoring and control.

The water discharge facility 1 according to the present invention does not require a pond 65 in the water discharge channel as in the conventional water discharge facility 60 described with reference to FIG.

As described above, according to the present invention, the amount of water discharged from the downstream water discharge channel 5 is adjusted so that the water level formed at the step portion 4 rises to near the water surface W of the upstream water discharge channel 3, Water can be discharged while preventing bubbles generated due to the drop of seawater 50 from 3 to step portion 4.

When the sea level Ws changes due to the tidal range and the head H changes, as shown in FIG. 2, the cable 12 is connected to the lower end 11 of the outer side of the flap 8 (sea S side) through the cable 12. What is necessary is just to attach the floating body 13.

The floating body 13 sinks in accordance with the rise of the sea surface Ws, and gives the flap 8 a buoyancy corresponding to the sinking volume of the floating body 13. In the flap 8, the given buoyancy and the seawater pressure corresponding to the rise in the sea level Ws cancel each other. That is, the water level resistance of the flap 7 that fluctuates due to the tidal range can be adjusted by the buoyancy of the floating body 13.

The water level resistance of the flap 8 which fluctuates due to the tidal range may be adjusted by, for example, changing the height of the upstream water discharge channel 3 from the sea surface Ws.

Next, a second embodiment of the present invention will be described.

FIG. 3 is a sectional view of a water discharge facility according to a second embodiment of the present invention.

As shown in FIG. 3, a water discharge facility 30 is provided with a water turbine 31 as a water level adjusting means 7 at a water outlet 6 of a downstream water discharge channel 5.
Is provided. This water wheel 31 has a central shaft 32
Is provided above the water outlet 7.

The weight of the water turbine 31 is determined, for example, in the same manner as the flap 8 in FIG. When the water level of the step portion 4 does not exceed the head H, the water turbine 31 closes the water discharge port 6 by its own weight, and raises the water level of the step portion 4 to near the water surface W of the upstream water discharge channel 3. Then, when the water level of the step portion 4 becomes equal to or higher than the head H, the water turbine 31 starts rotating by the water pressure and opens the water discharge port 6 by itself.
When water is discharged, water can be discharged without generating bubbles.

The water wheel 31 may be provided in the water outlet 6 by giving a rotational resistance in consideration of the head H in advance, for example. In this case, the rotational resistance of the water wheel 31 is such that the water level of the step portion 4 is equal to the head H
Is determined so that the turbine 31 stops or minutely rotates to give a resistance to the flow when it does not exceed, and when the head becomes equal to or greater than the head H, the rotation speed of the turbine 31 is increased to reduce the resistance to the flow. Is done.

As described above, the water wheel 3 is used as the water level adjusting means 7.
When 1 is used, one or both of the weight and rotation resistance of the water wheel 31 may be appropriately adjusted.

The present invention can be implemented by using existing equipment as it is. As shown in FIG.
Reference numeral 0 denotes a case where a flap 41 similar to the flap 8 in FIG. 1 is provided at the water outlet 67 of the middle water discharge channel 64 in FIG.
In this case, the water surface Wp of the pond 65 and the water surface W of the upstream water discharge channel 3
Is defined as a head h, and the weight of the flap 41 is determined in consideration of the head h.

In this way, it is possible to discharge the used seawater or the like to the sea without generating bubbles by using the existing facilities as they are.

Although the above embodiment has been described with reference to an example in which a flap or a water wheel is used as the water level adjusting means, the water level adjusting means in the present invention is not limited to these. As the water level adjusting means, for example, an openable / closable gate may be provided at the water outlet.

This gate is controlled by, for example, a separately provided control means so as to close the outlet when the water level formed at the step does not exceed the drop between the water surface of the upstream water discharge channel and the sea surface. When the water level formed at the stepped portion becomes equal to or higher than the head, the water outlet is controlled to be opened. In this way, even when a gate is used, it is possible to discharge used seawater or the like into the sea without generating bubbles.

[0041]

As is apparent from the above description,
According to the present invention, the following excellent effects are exhibited.

(1) When discharging used seawater or the like into the sea, water can be discharged without generating bubbles.

(2) Low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing a preferred embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing an example in which the present invention is applied to a conventional water discharge facility.

FIG. 5 is a schematic view of a conventional water discharge facility.

FIG. 6 is a schematic view of a conventional water discharge facility.

[Explanation of symbols]

 Reference Signs List 1 water discharge facility 2 water discharge channel 3 upstream water discharge channel 4 step 5 downstream water discharge channel 6 water discharge port 7 water level adjusting means 50 used seawater S sea Ws sea water surface W water surface of upstream water discharge water H head

Claims (5)

[Claims] 1. A water discharge facility for discharging used seawater or the like from an upstream water discharge channel having a drop from the sea surface to a sea from a downstream water discharge channel through a step portion, wherein the water discharge port of the downstream water discharge channel is provided. And a water level adjusting means for raising a water level formed at the step portion to near the water surface of the upstream water discharge channel. 2. The water level adjusting means comprises a flap provided at an upper portion of the water outlet so as to be openable and closable, wherein the water outlet is closed by the weight of the flap and opened according to the water level formed at the step portion. The water discharge facility described. 3. The water discharge facility according to claim 2, wherein a floating body is attached to a lower end of the outer side of the flap via a rope, and a water level resistance of the flap, which fluctuates due to a tide level, is adjusted by the buoyancy of the floating body. 4. The water discharge according to claim 1, wherein said water level adjusting means comprises a water turbine, and closes a downstream water discharge channel at a lower portion of said water turbine, and rotates according to a water level of a step to discharge seawater or the like. Facility. 5. A water discharge method for discharging used seawater or the like from an upstream water discharge channel having a drop from the seawater surface to a sea from a downstream water discharge channel through a step portion, wherein a water level formed at the step portion is provided. Adjusts the water discharge amount of the downstream water discharge channel so that it rises near the water surface of the upstream water discharge channel, and discharges water while preventing bubbles generated by falling of seawater etc. from the upstream water discharge channel to the step. Water discharge method.