JP2004211489A - Inflow sediment removing method for conduit and sand removing method for water reservoir - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively and continuously discharge sand to a conduit of a water reservoir type hydraulic power plant. <P>SOLUTION: This inflow sediment removing method for the conduit removes the sand by a branch waterway by arranging the branch waterway communicating with a main river by interposing sediment separating equipment in the middle of the conduit for communicating the power plant with an intake of a water reservoir of the water reservoir type hydraulic power plant. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for removing sediment inflow from a headrace and a method for discharging sand from a reservoir.
[0002]
[Prior art]
In a reservoir-type power plant in which a river is dammed by a dam, progress of sedimentation causes problems such as a decrease in storage capacity and wear of power generation facilities.
[0003]
In the reservoir type hydroelectric power plant, it is assumed that the sediment does not flow into the headrace due to the sedimentation effect of the reservoir, so there is no equipment to remove the sediment that has flowed into the headrace along the way.
[0004]
As shown in FIG. 8, in the run-of-river type hydroelectric power plant, as shown in FIG. 8, the sediment 104 flowing into the headrace 103 communicating the river 101 and the power plant 102 is settled, and then the power generation is stopped (sedimentation basin). 105) exists. Reference numeral 106 denotes a water intake.
[0005]
However, since this facility (sand basin 105) has a free water surface, it cannot be applied to a pressure type waterway of a reservoir type power plant.
[0006]
In addition, as a countermeasure against sand discharge from the reservoir, conventionally, when sediment has been deposited, a boat is floated on the reservoir and dredged.
[0007]
Since dredging is not very efficient, as shown in FIG. 9, a sand discharge gate 203 is opened at the lower part of the dam 202 that dams the river 201, from which the water level of the reservoir 204 of the dam 202 is lowered to the vicinity of Karappo and the reservoir is lowered. So-called gate sand discharge for discharging the sediment deposited in the inside 204 has been performed. Reference numeral 205 denotes a headrace, and reference numeral 206 denotes a power plant.
[0008]
Further, as shown in FIG. 10, a weir 303 is provided on the upstream side of the reservoir 302 of the dam 301, and the upstream of the weir 303 and the downstream of the dam 301 are communicated with each other by the bypass channel tunnel 304, and the inflow sediment is passed through the bypass channel tunnel 304. There is bypass sand discharge that discharges inflow sediment downstream from the dam 301. Reference numeral 305 denotes a headrace, and reference numeral 306 denotes a power plant.
[0009]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-167740
[Problems to be solved by the invention]
Since sediment has actually flowed into the introduction channel of the reservoir type hydroelectric power plant, it is necessary to discharge sand to prevent wear of the power generation equipment.
[0011]
Also, in order to prevent the storage capacity from decreasing due to sedimentation in the reservoir of the reservoir type hydroelectric power plant, sand should be drained from the reservoir. It must be cheaper than conventional dredging, gate sand removal and bypass sand removal, and must be capable of continuous sand removal.
[0012]
[Means for Solving the Problems]
Accordingly, the present invention has been made in view of the above circumstances, and in order to make it possible to continuously and inexpensively discharge sediment into a headrace of a reservoir type hydroelectric power plant, the intake of the reservoir type hydroelectric power plant and the power generation system are described. A method of removing sediment inflow from the headrace channel was established in which a branch waterway communicating with the main river was provided through a sediment separation facility in the middle of the introductory path connecting the places.
[0013]
In addition, the present invention provides a reservoir-type hydroelectric power plant with a water intake that enables continuous discharge of sediment from the reservoir of the reservoir-type hydroelectric power plant without the need to newly install a sand-removal facility in the embankment. In the middle of the headrace channel that communicates with the power plant, a branch waterway communicating with the main river was provided, and the sediment of the reservoir was discharged by the branch waterway.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described in detail below based on a specific embodiment shown in the accompanying drawings.
[0015]
In FIG. 1 and FIG. 2, a river 1 is dammed by a dam 2 to form a reservoir 3. The water intake 4 of the reservoir 3 is communicated with the power plant 5 by the headrace 6. A branch waterway 7 communicating with the river 1 is provided in the middle of the waterway 6.
[0016]
As shown in FIGS. 3 and 4, a widening portion 8 as a sediment separation facility is provided at a connection between the headrace channel 6 and the branch channel 7. The sediment concentration distribution of the headrace channel 6 is as shown in A, and the sediment concentration distribution of the widened portion 8 has a lower concentration as shown in B due to the decrease in the flow velocity. Evacuation takes place. Then, the low-concentration portion flows into the headrace 6. In addition, the passage of the branch waterway 7 is always open when the portion of the waterway 6 has a certain soil concentration or more. If the lower part of the sediment concentration distribution of the headrace channel 6 is already sufficiently high, the widened portion 8 is not necessarily required.
[0017]
On the other hand, Japanese Patent Application Laid-Open No. 2002-167740, which is a prior document of the present invention, provides a branch pipe 23 in the middle of a water guide pipe 22 for communicating an intake port with a water turbine / generator 21 as shown in FIG. The valve 23 is provided with a valve 24 for opening and closing the sand discharge pipe 23. In this power generation method, bed load is separated by inertial force, and suspended sand is separated by eddy current. As shown in FIG. 6, the valve 24 is closed, sediment is deposited on the sand discharge pipe 23, and the sediment is separated. As shown in FIG. 7, the valve 24 is opened, and the sand is discharged by water hammer.
[0018]
According to the present invention, the separation of the earth and sand can be easily performed simply by providing the widened portion 8, and the earth and sand can be continuously separated.
[0019]
【The invention's effect】
The present invention provides, as described above, a branch waterway communicating with the main river through a sediment separation facility in the middle of a waterway that connects the intake of the reservoir of the reservoir type hydroelectric power plant to the power plant. Since the method is a method of removing sediment inflow from the headrace so as to discharge sand, it is possible to continuously and inexpensively discharge sediment into the headrace of the reservoir type hydroelectric power plant.
[0020]
Further, the present invention provides a branch waterway communicating with the main river in the middle of a headrace channel that connects the water intake of the reservoir of the reservoir type hydroelectric power plant with the power plant, and discharges the sediment of the reservoir by the branch waterway. Because of this method of discharging sand from the reservoir, it is possible to continuously discharge the sediment from the reservoir of the reservoir type hydroelectric power plant without installing new sand discharge facilities in the embankment.
[Brief description of the drawings]
FIG. 1 is a schematic diagram in which a headrace and a main river of the present invention are connected by a branch canal.
FIG. 2 is a plan view in which a headrace and a main river of the present invention are communicated with each other through a branch canal.
FIG. 3 is a schematic view showing a main part of the present invention.
FIG. 4 is a schematic view showing a main part of the present invention.
FIG. 5 is a schematic view showing the prior art document JP-A-2002-167740.
FIG. 6 is a schematic diagram showing a state in which the valve in FIG. 5 is closed.
FIG. 7 is a schematic diagram showing a state where the valve of FIG. 5 is open.
FIG. 8 is a schematic diagram showing a conventional method for removing sand from a pouring power plant.
FIG. 9 is a plan view showing a method of discharging sand from a gate of a conventional reservoir-type hydroelectric power plant.
FIG. 10 is a plan view showing a conventional sand-removing method for the bypass of a reservoir-type hydroelectric power plant.
[Explanation of symbols]
4 intake 5 power plant 6 headrace 8 widening part (example of sediment separation equipment)
1 ... river 7 ... branch waterway

Claims (2)

A branch waterway communicating with the main river through a sediment separation facility is provided in the middle of the waterway connecting the intake of the reservoir and the power plant of the reservoir type hydroelectric power plant. How to remove inflow sediment. A reservoir drainage method in which a branch waterway communicating with the main river is provided in the middle of the headrace channel that connects the reservoir intake of the reservoir type hydroelectric power plant with the power plant, and the sediment of the reservoir is discharged by the branch waterway. .

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