JP7029671B2 - Water intake device - Google Patents

Description

The present invention relates to an intake device used in an intake facility or the like in which an intake weir is provided in a river to block a part of the river and to send a part of the river water to a hydroelectric power plant through a headrace.

As a facility to take in river water for hydroelectric power generation, an intake dam (intake dam) is installed in the river to block a part of the river, take a part of the river water, and send it to the hydroelectric power plant through the headrace. It has been known. Since it is necessary to manage the intake of water from river water so as not to exceed the permitted intake amount, an intake gate is usually installed at the intake.

The opening adjustment of the intake gate is usually controlled based on the dam side water level which is the upstream side water level of the intake gate and the water level in the headrace which is the downstream side water level of the intake gate (see, for example, Patent Document 1). An intake gate control system capable of efficiently adjusting the gate has also been developed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2009-197546 Japanese Unexamined Patent Publication No. 2013-96190

Normally, the amount of water intake can be controlled by adjusting the opening degree of the intake gate, but control of the amount of water intake when a large amount of water directly flows into the headrace at the time of water discharge becomes a problem. In Patent Document 1, as a control system for preventing water from flowing directly into a headrace and raising the water level and causing the water level in the water tank of a power plant to overflow, it is possible to prevent the water tank from overflowing by lowering the intake gate for a predetermined time. Are listed.

Further, Patent Document 2 describes that when the water level in the headrace reaches a dangerous water level, the intake gate is fully closed to prevent damage to the hydroelectric power plant. However, the methods described in Patent Document 1 and Patent Document 2 cannot deal with the case where a large amount of water directly flows into the headrace.

When a large amount of water flows into the headrace and the water level rises, the waterway is destroyed and the generator output exceeds the approved output. However, no method has been developed to deal with this problem.

An object of the present invention is to provide a water intake device capable of preventing the collapse of a waterway even if a large amount of water flows into the waterway due to flooding or the like, and controlling the amount of water intake to the permitted amount of water intake.

The present invention has an intake gate that regulates the amount of river water taken in, a first water level gauge that detects the water level on the upstream side of the intake gate, and a second water level gauge that detects the water level of a water channel located downstream of the intake gate. An intake gate control device that controls the opening degree of the intake gate based on the outputs of the first water level gauge and the second water level gauge, and an excess water intake prevention gate installed in the water channel downstream of the second water level gauge. And an excess water intake prevention gate control device that controls the opening degree of the excess water intake prevention gate based on the output of the second water level gauge, and the water intake gate control device has a water level detected by the second water level gauge. When the water level is below the upper limit water level, the opening of the intake gate is adjusted to control the amount of water intake. When the water level detected by the second water level gauge is equal to or lower than the upper limit water level, the prevention gate control device opens the excess intake prevention gate to the upper limit water level or higher, and the water level detected by the second water level gauge is the upper limit. It is a water intake device characterized in that when the water level exceeds the water level, the opening degree of the excess water intake prevention gate is adjusted to control the water intake amount .

Further, in the water intake device of the present invention, the water level detected by the second water level gauge is characterized in that it exceeds the upper limit water level when water directly flows into the water channel from the outside on the downstream side of the intake gate.

Further, the water intake device of the present invention includes a gate control device in place of the water intake gate control device and the excess water intake prevention gate control device, and the gate control device adjusts the opening degree of the water intake gate and the excess water intake prevention gate. It is characterized by controlling.

Further, the water intake device of the present invention is characterized in that the water channel has an open drain portion and the open channel portion of the water channel is provided close to the river.

Further, in the water intake device of the present invention, the water channel has an open portion and a closed portion, the open portion is located on the upstream side, the closed portion is located on the downstream side, and the excess water intake prevention gate is opened. It is characterized by being installed at the downstream end of the culvert portion.

Further, in the water intake device of the present invention, the water channel is a headrace for sending water to a hydroelectric power plant, and the upstream water level is a dam water level.

According to the present invention, it is possible to provide a water intake device capable of preventing the collapse of the waterway and controlling the water intake amount to the permitted water intake amount even if a large amount of water flows into the waterway due to flooding or the like.

It is a figure which shows the structure of the water intake device 1 of the 1st Embodiment of this invention. It is a figure which shows the structure of the water intake device 1 of the 1st Embodiment of this invention. It is a flowchart which shows the control procedure of the water intake device 1 of 1st Embodiment of this invention. It is a modification of the water intake device 1 of the first embodiment of the present invention.

1 and 2 are views showing the configuration of the water intake device 1 according to the first embodiment of the present invention, in which FIG. 1A is a schematic cross-sectional view and FIG. 2B is a schematic plan view. FIG. 1 shows the state of water intake during normal times, and FIG. 2 shows the state of water intake during flooding. At the time of flooding, water flows directly from the river 101 into the headrace 115 including the sand basin 117. FIG. 3 is a flowchart showing a control procedure of the water intake device 1 according to the first embodiment of the present invention. In this embodiment, the sand basin 117 is included in a part of the headrace 115.

In the intake device 1 of the first embodiment of the present invention, an intake dam (intake dam) 111 is provided in the river 101 to block a part of the river 101, take a part of the river water W, and generate hydroelectric power through the headrace 115. It is a water intake device installed in a water intake facility that sends water to a place (not shown), and controls the amount of water sent to a hydroelectric power plant.

The headrace 115 in the present embodiment has an open culvert portion 115a and an underdrain portion (closed culvert portion) 115b, the upstream side is the open culvert portion 115a, and the downstream side is the closed culvert portion 115b. The headrace 115 is provided so as to run in parallel with the river 101. A sand basin 117 is provided in the middle of the open culvert portion 115a, and a dust removing device 119 for removing dust is provided near the downstream end of the sand basin 117.

The water intake device 1 includes two gates, an intake gate 11 installed at an intake port 113 provided adjacent to the intake dam 111, and an excess water intake prevention gate 21 installed at the headrace 115. Further, the water intake device 1 includes two water level gauges 17 and 19 installed upstream and downstream of the intake gate 11, an intake gate control device 31 for controlling the opening degree of the intake gate 11, and an opening degree of the excess water intake prevention gate 21. It is provided with an excess water intake prevention gate control device 41 for controlling the above.

The water intake gate 11 is a gate for controlling water intake from the water intake port 113, includes a gate main body 13 and a drive device 15 for driving (vertically moving) the gate main body 13, and is installed at the water intake port 113. The gate body 13 is moved up and down according to a command from the intake gate control device 31 to control the amount of water intake. The form of the intake gate 11 is not particularly limited, but it is necessary that the intake port 113 can be fully closed.

The water level gauge 17 detects the water level of the portion blocked by the intake dam 111 and the intake gate 11 (hereinafter referred to as the dam water level), and is on the upstream side of the intake gate 11 and close to the intake gate 11. is set up. The water level gauge 19 detects the water level of the headrace 115, and is installed on the downstream side of the intake gate 11 and close to the intake gate 11. More specifically, it is installed in the open culvert portion 115a of the headrace 115 upstream of the sand basin 117. The structure, model, etc. of the water level gauge 17 and the water level gauge 19 are not particularly limited, and data is transmitted to the water gate control device 31.

The excess water intake prevention gate 21 is a gate for controlling the amount of water sent directly from the river 101 to the headrace 115 including the sand basin 117 at the time of flooding to the hydroelectric power plant, and is a gate with the gate main body 23. A drive device 25 for driving (moving up and down) the gate body 23 is provided, and a downstream end of the open drainage portion 115a of the headrace 15, that is, a boundary portion between the open drainage portion 115a and the closed drainage portion 115b of the headrace 15. It is installed in. The excess water intake prevention gate 21 controls the amount of water intake by moving the gate body 23 up and down according to a command from the excess water intake prevention gate control device 41. The form of the excess water intake prevention gate 21 is not particularly limited, but it is necessary to open the gate 21 above the water level of the headrace 115 when water is normally taken from the intake port 113.

The intake gate control device 31 includes a data receiving unit, a storage unit for storing set values, a calculation unit for performing various calculations and controls, and a drive device control unit for issuing a control command to the drive device 15 of the intake gate 11. It is connected to the water level gauge 17 for detecting the water level, the water level gauge 19 for detecting the water level in the headrace, and the drive device 15 for the intake gate 11. The intake gate control device 31 issues an open / close command to the drive device 15 based on the dam water level and the headrace water level so as to have a set water intake amount, and controls the opening degree of the intake gate 11. Such an intake gate control device 31 can be realized by using a computer equipped with a control procedure, a programmable logic controller, or the like.

The excess water intake prevention gate control device 41 includes a data receiving unit, a storage unit for storing set values, a calculation unit for performing various calculations and controls, and a drive device control unit for issuing a control command to the drive device 25 of the excess water intake prevention gate 21. It is connected to the water level gauge 19 that detects the water level of the headrace and the drive device 25 of the excess water intake prevention gate 21. The excess water intake prevention gate control device 41 issues an open / close command to the drive device 25 based on the water level of the headrace so as to have a set water intake amount, and controls the opening degree of the excess water intake prevention gate 21. Such an excess water intake prevention gate control device 41 can be realized by using a computer equipped with a control procedure, a programmable logic controller, or the like. The excess water intake prevention gate control device 41 of the present embodiment is connected to the water level gauge 19 via the water intake gate control device 31.

The control procedure of the water intake device 1 will be described.

The intake gate control device 31 and the excess intake prevention gate control device 41 determine whether or not the headrace water level detected by the water level gauge 19 is equal to or lower than the upper limit waterway water level (steps a1 and b1). Here, the upper limit water level is the limit water level of the headrace that can control the amount of water sent to the power plant via the intake gate 11, and if the headrace water level exceeds the upper limit waterway water level, the water intake amount is permitted even if the intake gate 11 is narrowed down. It exceeds the amount of water intake. The headrace water level exceeds the upper limit headrace water level when the water level of the river 101 rises at the time of flooding and the overflow water of the river 101 directly flows into the open culvert portion 115a of the headrace 115 or the sand pond 117. , Normally, the headrace water level does not exceed the upper limit headwater level.

When the intake gate control device 31 determines that the headrace water level is equal to or lower than the upper limit headrace water level, the intake gate control device 31 adjusts the opening degree of the intake gate 11 based on the dam water level and the headrace water level, and controls the amount of water sent to the power plant (step). a2, see FIG. 1). When the excess water intake prevention gate control device 41 determines that the water level of the headrace is equal to or lower than the upper limit water level, the excess water intake prevention gate 21 is controlled to be fully opened (see step b2 and FIG. 1). When the excess water intake prevention gate 21 is fully opened, the lower end 24 of the gate body 23 is at a position higher than the upper limit water level, so that the excess water intake prevention gate 21 does not affect the water supply.

On the other hand, when the intake gate control device 31 determines that the water level of the headrace exceeds the upper limit water level (step a1), the intake gate control device 31 issues a command to fully close the intake gate 11 (step a3). Along with this, the intake gate 11 is fully closed, and the intake of water from the intake port 113 is stopped (see FIG. 2). When the excess water intake prevention gate control device 41 determines that the headrace water level exceeds the upper limit waterway water level, it adjusts the opening degree of the excess water intake prevention gate 21 based on the headrace water level and controls the amount of water sent to the power plant. (See step b3, FIG. 2).

As described above, the water intake device 1 can normally control the amount of water intake via the water intake gate 11 in the same manner as the conventional water intake device. Furthermore, it is possible to control the amount of water sent to the power plant via the excess water intake prevention gate 21 even for water that directly enters the headrace 115 (including sand basin 117) at the time of flooding, which was not possible with conventional water intake devices. Is. As a result, even if a large amount of water flows into the headrace 115 due to flooding or the like, it is possible to prevent the headrace 115 from collapsing and control the amount of water intake to the permitted amount of water intake.

As shown in this embodiment, the headrace 115 (including the sand basin 117) includes the open culvert portion 115a, or the headrace 115 (including the sand basin 117) consists of the open culvert and is provided so as to run in parallel with the river 101. If this is the case, overflow water tends to flow from the river 101 due to a flood or the like. The water intake device 1 according to the present invention can be particularly preferably used for the headrace 115 having such a structure and arrangement.

As shown in the present embodiment, in the case of a headrace 115 having an open culvert portion 115a on the upstream side and a closed culvert portion 115b on the downstream side, water does not directly flow into the closed culvert portion 115b even at the time of flooding. It is very efficient to provide the excess water intake prevention gate 21 at the downstream end of the open drainage portion 115a of the headrace 115, in other words, at the boundary between the open drainage portion 115a and the closed drainage portion 115b.

Of the water intake devices 1 shown in the present embodiment, the water intake gate 11, the water level meter 17 for detecting the dam water level, the water level meter 19 for detecting the headrace water level, and the water intake gate control device 31 are the same as the conventional water intake devices. The water intake device 1 of the present invention can be easily obtained only by adding the excess water intake prevention gate 21 and the excess water intake prevention gate control device 41 to the existing water intake device.

The water intake device according to the present invention is not limited to the above embodiment, and can be changed and used without changing the gist. The water intake device 1 shown in the above embodiment is provided with a control device for each of the two gates, but as shown in FIG. 4, one gate control device 51 is provided, and the gate control device 51 provides an intake gate 11 and excess water intake. The prevention gate 21 may be controlled. In this case as well, the gate control device 51 can be easily obtained by improving the existing intake gate control device. 4A and 4B are views corresponding to FIG. 1, in which FIG. 4A is a schematic cross-sectional view and FIG. 4B is a schematic plan view.

In the above embodiment, when the excess water intake prevention gate control device 41 determines that the headrace water level is equal to or lower than the upper limit waterway water level, the excess water intake prevention gate 21 is controlled to be fully opened, but the lower end 24 of the gate body 23 is The position may be controlled to be higher than the upper limit water level, and the excess water intake prevention gate 21 does not necessarily have to be fully opened.

Further, in the above embodiment, the intake device installed in the intake facility that sends a part of the river water W to the hydroelectric power plant through the headrace 115 is shown, but the application place of the intake device is the intake facility that sends water to the hydroelectric power plant. Needless to say, it is not limited to. Further, although the water intake facility of the present embodiment is provided with the sand basin 117, the water intake device according to the present invention can be suitably used for the water intake facility not provided with the sand basin 117.

Although preferred embodiments have been described with reference to the drawings, those skilled in the art will readily assume various changes and modifications within the obvious scope of this specification. Therefore, such changes and amendments are construed as being within the scope of the invention as defined by the claims.

1 Water intake device 11 Intake gate 13 Gate body 15 Drive device 17 Water level gauge 19 Water level meter 21 Excessive water intake prevention gate 23 Gate body 24 Lower end of gate body 25 Drive device 31 Intake gate control device 41 Excessive water intake prevention gate control device 51 Gate control device 101 River 111 Intake dam (intake weir)
113 Intake port 115 Headrace 115a Open culvert 115b Underdrain 117 Settling basin 119 Dust remover W River water

Claims (6)

An intake gate that regulates the amount of river water taken in,
The first water level gauge that detects the water level on the upstream side of the intake gate,
A second water level gauge that detects the water level of the waterway located downstream of the intake gate, and
An intake gate control device that controls the opening degree of the intake gate based on the outputs of the first water level gauge and the second water level gauge.
An excess water intake prevention gate installed in the waterway downstream of the second water level gauge, and
An excess water intake prevention gate control device that controls the opening degree of the excess water intake prevention gate based on the output of the second water level gauge, and
Equipped with
When the water level detected by the second water level gauge is equal to or lower than the upper limit water level, the intake gate control device adjusts the opening degree of the intake gate to control the intake amount, and the water level detected by the second water level gauge is the water level. When the upper limit water level is exceeded, the intake gate is fully closed and
When the water level detected by the second water level gauge is equal to or lower than the upper limit water level, the excess intake prevention gate control device opens the excess intake prevention gate to the upper limit water level or higher, and the water level detected by the second water level gauge. The water intake device is characterized in that when the water level exceeds the upper limit water level, the opening degree of the excess water intake prevention gate is adjusted to control the water intake amount . The water intake device according to claim 1 , wherein the water level detected by the second water level gauge exceeds the upper limit water level when water directly flows into the water channel on the downstream side of the intake gate. A gate control device is provided in place of the intake gate control device and the excess water intake prevention gate control device.
The water intake device according to claim 1 or 2 , wherein the gate control device controls the opening degree of the water intake gate and the excess water intake prevention gate. The channel has an open culvert
The water intake device according to any one of claims 1 to 3 , wherein the open ditch portion of the waterway is provided close to the river. The channel has an open and closed portion,
The open culvert portion is located on the upstream side, and the closed culvert portion is located on the downstream side.
The water intake device according to any one of claims 1 to 4 , wherein the excess water intake prevention gate is installed at the downstream end of the open culvert portion. The waterway is a headrace that sends water to a hydroelectric power plant.
The water intake device according to any one of claims 1 to 5 , wherein the upstream water level is a dam water level.

Images