JP2777872B2 - River water reuse method and reuse device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reusing river water. More specifically, the present invention relates to an improvement relating to an implementation scale of a method of recycling river water before flowing into a sea area, and a river water recycling apparatus suitable for performing the recycling method.

[0002]

2. Description of the Related Art Conventionally, as a method of recycling river water, for example, a reservoir and a pump are attached to a power generation facility installed near a dam, and water in the dam is dropped to the power generation facility in the daytime to generate power. It is known that water is stored in a reservoir after power generation, and the water in the reservoir is pumped to a dam by a pump at night.

[0003] This conventional method of reusing river water uses the difference in power demand between daytime and nighttime to repeatedly use water for power generation stored in a dam.

[0004] In such a conventional method for reusing river water, only a small-scale reuse system near a dam is used.
There is a problem that a large-scale reuse system cannot respond to recent increases in demand for domestic water in urban areas.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and has been made in consideration of the above-mentioned problems. It is an object of the present invention to provide a river water recycling apparatus suitable for implementing the method.

[0006]

In order to solve the above-mentioned problems, a method of recycling river water according to the present invention is characterized in that a river water is taken in the vicinity of an estuary and the river water is taken. Transfer water as needed to the river system from which it was withdrawn or to a dam constructed upstream of another river system, and if water supply is not necessary, retain the river water from the intake to the dam's water path. Adopt means to keep

According to another aspect of the present invention, there is provided a river water recycling apparatus installed near a river mouth to take in river water, From the river water system where the intake is installed or a dam constructed upstream of another river water system, and a water pipe in which the river water is distributed or held, and a water pipe installed in the middle of the water pipe A water supply pump for supplying the river water to the dam side, and a switching mechanism provided at an end of the water supply pipe on the dam side to switch the river water of the water supply pipe to discharge to the dam and to hold the water in the water supply pipe. Adopt means.

[0008]

According to the above-mentioned means, according to the first aspect, the river water circulation path is formed in a wide area from the dam to the vicinity of the river mouth, and the river water is always reserved in the water supply path from the intake port to the dam. Since the rapid operation of the circulation path is enabled, the problem of providing a method of reusing river water that enables large-scale reuse is solved.

According to a second aspect of the present invention, in order to achieve the above-described operation of the first aspect, the water supply path is constituted by a water supply pipe, a water supply pump, and the like, which are generally known in the art, thereby enabling efficient water supply. At the same time, since a switching mechanism is provided to allow the river water to be retained in the water pipe, the problem of providing a river water recycling apparatus suitable for performing the above-described river water recycling method is solved. You.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a river water recycling method and apparatus according to the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of a river water recycling method and apparatus according to the present invention.

First, the configuration of a first embodiment of a river water recycling apparatus according to the present invention will be described.

In this embodiment, as shown in FIG. 1, in addition to the natural flow path of the river water 4 from the dam 1 through the river 2 to the estuary 3, the river water 4 is supplied from the vicinity of the estuary 3 to the dam 1. It has a water supply path 5 for backflow, and constitutes a circulation path for river water 4 in a wide area from dam 1 to estuary 3.

The water supply path 5 includes a water intake 51, a water supply pipe 52,
It consists of a water pump 53.

The water intake 51 is for taking the river water 4 from the river 2, and the river 3 immediately before the river water 4 flows into the sea area 6.
It will be installed at a location where seawater does not enter. The water inlet 51 is provided with simple purification equipment as needed.

The water pipe 52 is used to circulate the river water 4 taken in at the water inlet 51. The water pipe 52 has a normal structure such as a steel pipe and is disposed from the water inlet 51 to the dam 1. The arrangement of the water pipe 52 can be along the river 2,
It is also possible to follow the water intake 51 remote from the river 2 and the shortest distance of the dam 1 substantially linearly.

The water supply pump 53 is connected to the river water 4 of the water supply pipe 52.
Is supplied to the dam 1 side, and has a normal structure such as a mixed flow pump and is installed in the middle of the water supply pipe 52.

From the viewpoint of actual construction, for example,
Distance from estuary 3 to dam 1 (disposition distance of water pipe 52)
Is 30 Km, the elevation of the water intake 51 of the water supply path 5 is 0 m, and the elevation of the dam 1 is 1,000 m, the diameter of the water pipe 52 is 3 m, and the water supply pump 53 of 4,400 Kw is provided for every 100 m of altitude difference. It is preferable to install the base.

Further, in this embodiment, a switching mechanism 7 is provided at the end of the water supply pipe 52 of the water supply path 5 on the dam 1 side.

The switching mechanism 7 comprises a shaft 71, a vertical pipe 72, a water discharge pipe 73, a first switching valve 74, and a second switching valve 75, as shown in detail in FIGS.

The shaft 71 is vertically excavated near the dam 1 or near the dam 1 and is opened to the atmosphere. The shaft 71 is excavated below the sea level of the water intake 51 of the water supply path 5. This shaft 7
The diameter of 1 is slightly larger than the diameter of the standing pipe 72.

The vertical pipe 72 is connected to a water discharge pipe 73 at an end of the water supply pipe 52 of the water supply path 5 on the dam 1 side, and is disposed vertically inside the vertical shaft 71. The lower end of the standpipe 72 is set at about 11 m (above 10.33 m at which atmospheric pressure acts) below sea level of the water intake 51 of the water supply path 5 (see FIG. 3).

The water discharge pipe 73 is connected to the standing pipe 72 at an end of the water supply pipe 52 of the water supply path 5 on the dam 1 side, and is disposed toward the water storage surface of the dam 1.

The first switching valve 74 is connected to the water supply pipe 5 of the water supply path 5.
2 is provided between the end of the dam 1 on the side of the dam 1 and the standpipe 72, and can be opened and closed to communicate and shut off both.

The second switching valve 75 is connected to the water supply pipe 5 of the water supply path 5.
2 is provided between the end on the dam 1 side and the water discharge pipe 73,
They can be opened and closed to communicate and shut off both.

Next, a first embodiment of the river water recycling method according to the present invention will be described based on a usage example of the first embodiment of the river water recycling apparatus according to the present invention.

The river water 4 is discharged from the dam 1 and the river 2
Through the river, it is used as tap water, agricultural water, etc., and is discharged and discharged, and flows into the sea area 6 at the estuary 3. However, a part of the river water 4 is taken from the water intake 51 of the water supply path 5.

The taken river water 4 is fed by the water supply pump 53 of the water supply path 5 to the inside of the water supply pipe 52 toward the dam 1. Then, as shown in FIG. 2, by setting the first switching valve 74 of the switching mechanism 7 to “close” and the second switching valve 75 to “open”, the water discharge surface 73 of the switching mechanism 7 is To be released. In addition, this water supply is performed by the water supply pipe 5
2. Since the operation is performed in a closed water supply structure such as the water supply pump 53, the efficiency is very high.

Therefore, a part of the river water 4 which flows into the sea area 6 at the estuary 3 and is not used at all is returned to the dam 1 and can be used again as tap water, agricultural water and the like. . Moreover, since the circulation path of the river water 4 is formed in a wide area from the dam 1 to the vicinity of the estuary 3, the reuse of the river water becomes large-scale.

In the case where the river water 4 is not discharged to the dam 1 due to a large amount of water stored in the dam 1, for example,
As shown in FIG. 3, by setting the first switching valve 74 of the switching mechanism 7 to “open” and the second switching valve 75 to “closed”, the standing pipe 72 of the switching mechanism 7 is filled with the river water 4. The river water 4 can be reserved in the water supply path 5 (water supply pipe 52). That is, the water supply pipe 52 of the water supply path 5 and the standing pipe 72 of the switching mechanism 7 are configured as siphon pipes.
Since the lower end of the standing pipe 72 of the switching mechanism 7 is set below the sea level of the water intake 51 of the water supply path 5, the water supply path 5
Although the river water 4 reserved in the water flow may flow toward the standing pipe 72 side, it does not escape to the intake port 51 side of the water supply path 5.

Therefore, when the discharge of the river water 4 to the water storage surface of the dam 1 is restarted, the discharge is started immediately by driving the water supply pump 53 of the water supply path 5. Water supply route 5
Since no air is interposed in the middle of the process, the load at the time of starting the water supply pump 53 of the water supply path 5 is reduced.

If the amount of water stored in the dam 1 increases due to heavy rain or the like and a large amount of river water 4 must be discharged, the water supply pump 53 of the water supply path 5 is stopped, and the first switching mechanism 7 By setting the switching valve 74 and the second switching valve 75 to “open”, the river water 4 is supplied to the estuary 3
Can be released nearby. For this reason, it is possible to prevent flooding in the middle basin between the dam 1 and the estuary 3. If the water supply pump 53 of the water supply path 5 has a structure capable of reverse rotation (reverse water supply), the discharge rate of the river water 4 to the vicinity of the estuary 3 can be increased.

FIG. 4 shows a second embodiment of the river water recycling method and apparatus according to the present invention.

In this embodiment, the water discharge pipe 73, the first switching valve 74, and the second switching valve 75 of the switching mechanism 7 in the first embodiment are omitted, and the shaft 71 is opened and closed on the dam 1 side as the switching mechanism 7. Door 76 and a vacuum unit 77 connected to the shaft 71 are added.

According to this embodiment, the opening and closing door 76 is opened and the vacuum section 77 is stopped, so that the river water 4 can be reserved in the water supply path 5.

Further, by driving the vacuum unit 77 to open the opening / closing door 76 by a required amount, it is possible to promote the discharge to both the dam 1 side and the river mouth 3 side by the suction force acting on the shaft 71. it can.

As described above, in addition to the illustrated embodiment, an embodiment in which the water intake 51 of the water supply path 5 is installed near the estuary 3 of a river system different from the dam 1 can be adopted.

Further, an embodiment may be provided in which a branch valve for utilizing river water is provided in the middle of the water supply path 5.

[0039]

As described above, in the method for recycling river water according to the present invention, since the water supply route is provided in a wide area from the vicinity of the estuary to the dam, the river water can be reused on a large scale. effective.

Further, since the river water is reserved in the water supply route, there is an effect that the water supply of the river water can be promptly restarted.

Further, there is an effect that the stored water of the dam is caused to flow backward in the water supply route, thereby preventing flooding in the middle basin.

Further, the river water recycling apparatus according to the present invention not only does not impair the effect of the above-described river water recycling method according to the present invention, but also uses the closed system water supply structure to supply water. Has the effect of being very efficient.

Furthermore, since the river water is reserved in the water supply route, the load at the time of starting the water supply pump at the time of restarting the water supply is reduced.

Furthermore, by promoting the discharge to the estuary by making the water supply pump a structure capable of supplying water in the reverse direction, there is an effect that floods in the middle basin can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a river water recycling method and a recycling apparatus according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is another operation diagram of FIG. 2;

FIG. 4 is a sectional view of a main part showing a second embodiment of the river water recycling method and the reuse apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 dam 2 river 3 estuary 4 river water 5 water supply route 51 water intake 52 water supply pipe 53 water supply pump 7 switching mechanism

Claims (2)

(57) [Claims] Claims 1. In the case where water is taken in the vicinity of an estuary and water is supplied to a dam constructed in the upstream of another river water system or another river water system where the water is not taken as necessary. A method for reusing river water that retains river water from the water intake to the dam. 2. A water intake installed near a river mouth for taking in river water, and a water intake from the water intake to a river water system where the water intake is installed or a dam constructed upstream of another river water system. A water pipe through which river water is distributed or reserved;
A water pump installed in the middle of the water pipe to feed the river water from the water pipe to the dam, and a water pump installed at the end of the water pipe on the dam side to discharge the river water to the dam and hold it in the water pipe. A river water recycling device comprising a switching mechanism for switching between the two.