JP2003020635A - Water-intake device for power generation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-intake device for power generation small in size and not requiring a power supply. SOLUTION: This water-intake device for power generation comprises a floating body 3 floated on water and having a pump 4 for sucking water, ground side equipment 2 receiving water from the floating body 3, and ground side piping 6 as piping for feeding the water sucked by the floating body 3 to the ground side equipment 2. An automatic pressure control valve 10 is installed for controlling the pressure of the water according to the pressure of the water taken into the ground side piping 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water intake device for power generation used for power generation equipment such as gas turbine plants.

[0002]

2. Description of the Related Art In a power generation plant such as a gas turbine plant, there is a case where required water is taken from a dam lake or the like and sent by a pipeline. In a dam lake, a floating body (floating jetty) equipped with a pump is floated on the water surface, and the water is taken up by the pump and pumped to the ground.

[0003]

In a dam lake or the like, the water level may fluctuate by about 50 m. There is a difference in water pressure between the low water level and the high water level.
That is, when the water level is low, the pressure difference is low because the height difference between the pump and the ground is large, and when the water level is high, the pressure difference is high because the height difference between the pump and the ground is small. In order to suppress such a pressure difference and perform stable water intake, it is conceivable to provide a control facility on the ground side to control the pressure. For example, a method in which a control valve is provided in a pipe of pumped water and the opening degree is electronically controlled according to the water level can be considered. However, since it requires electric power and controlled air equipment, it is difficult to install it in mountainous areas where power and controlled air equipment are not supplied or in dam lakes in remote areas. It is also possible to install a bank support type cylinder gate as water intake equipment so as to cope with fluctuations in water level. However, such a gate-type water intake facility has a problem that the device becomes huge and the cost becomes high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water intake device for power generation that is small in size and does not require a power source or a control air facility.

[0005]

According to a first aspect of the present invention, there is provided a floating body provided with a pump that floats on the water and sucks up water, ground equipment to which water is supplied from the floating body, and suction by the floating body. A pipe for sending the taken water to the above-ground facility, and a self-pressure valve for controlling the pressure and flow rate of the water according to the pressure of the taken water is interposed in the pipe. To do.

In the present invention, the pressure is controlled by providing a self-pressure valve that does not require a power source or controlled air equipment.

According to a second aspect of the present invention, in the water intake device for power generation according to the first aspect, the pipe is expandable and contractable in a longitudinal direction.

In the present invention, even if the floating body moves up and down due to fluctuations in the water surface, the pipe expands and contracts to follow the movement of the floating body. At this time, the pressure loss may change due to the fluctuation of the water supply path length, but since the discharge pressure is controlled by the self-pressure valve in the present invention as described above, it is stable regardless of the fluctuation of the water supply path length. Water pressure can be controlled.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a water side facility, and 2 is a ground side facility. Reference numeral 3 is a floating body (floating jetty) floated on the water, and 4 is a floating body 3.
Is a pump installed in. As will be described later, when the water level decreases, the height difference between the pump 4 and the ground-side equipment 2 increases, so that the water pressure reaching the ground side decreases. The pump 4 is selected so that a sufficient water pressure can be obtained on the ground side even at the lowest water level. Waterside equipment 1 and aboveground equipment 2
Are connected to each other by a ground side pipe 6, a steel pipe 7, an expandable and contractible flexible pipe 8 and a floating body side pipe 9 provided on the ground side as pipes. Although shown in a simplified manner in the figure, in this example, the steel pipe 7
Are provided along the lake bottom, and the flexible pipe 8 extends from the end of the steel pipe 7 at the lake bottom to the floating body 3 on the water surface. When the water surface WL of the dam lake rises, the flexible pipe 8 extends in the longitudinal direction as the floating body 3 rises, and when the water surface WL falls, the flexible body 8 descends as the floating body 3 descends.
Is reduced in the longitudinal direction.

A self-pressure valve 10 whose valve opening is controlled by the pressure on the upstream side is interposed in the aboveground piping 6. The self-pressure valve 10 includes a valve body 10c and an opening degree adjusting unit 10a that controls the opening degree of the valve body 10c. The opening adjustment unit 10a
As shown in FIG. 2, it is provided with an inflow port 15a into which the fluid for driving the valve body 10c flows, and a discharge port 15b to discharge the fluid, and the fluid in the upstream flow path is connected to the communication port 10b (see FIG. 1). Is given by. The fluid flowing into the inflow port 15a flows into the working chamber 16 and exerts pressure on the plate 17 to move the valve body 10c. Then, the liquid is discharged from the discharge port 15b. That is, the opening adjustment unit 10a includes the communication pipe 10
It is a mechanism for controlling the opening degree of the valve body 10c according to the pressure of the fluid in b. The downstream side of the ground side pipe 6 is connected to a distant power generation facility (turbine plant) so that the water taken in by the pump 4 is sent to the power generation facility.

In the intake facility thus constructed, the flexible pipe 8 extends because the height from the lake bottom to the water surface WL becomes high when the water level is high. In this state, the height difference between the water side equipment 1 and the ground side equipment 2 is small,
The water taken in by the pump 4 has high water pressure, and the self-pressure valve 10
Reach In the self-pressure valve 10, the valve body 10c is throttled by the opening degree adjusting unit 10a, and the water having a high water pressure is made a low water pressure and sent to the downstream side. When the water level is low, the height from the lake bottom to the water surface WL becomes low, so that the flexible pipe 8 contracts. In this state, the height difference between the water-side equipment 1 and the ground-side equipment 2 becomes large, so that the water taken in by the pump 4 reaches the self-pressure valve 10 at a low water pressure. In the self-pressure valve 10, the opening adjustment unit 10
The valve body 10c is opened by a, and water is sent to the downstream side while maintaining a low water pressure. Although the flexible pipe 8 may expand and contract, the water supply path length may fluctuate and the pressure loss may change. However, since the water pressure is controlled by the self-pressure valve 10 as described above, the water supply path length varies. Regardless of this, the water pressure can be controlled stably.

As described above, in the water intake equipment of this embodiment, the water pressure can be controlled according to the water level by providing the self-pressure valve 10. Therefore, water can be stably supplied. Further, if the self-pressure valve 10 is not provided, a pump selected so that sufficient pressure can be obtained at a low water level will have an overflow operation at a high water level,
The pump has exceeded its operating range and cannot be operated. Therefore, one rank higher (wide operating range)
A pump must be employed to withstand overflow. In this example, since the flow rate can be reduced by reducing the pressure with the self-pressure valve 10 when the water level is high,
It can be operated by the pump selected based on the low water level. Therefore, a small pump can be adopted.

In addition to the above-mentioned structure, the self-pressure valve 10
A generally known structure can be adopted.

[0014]

As described above, in the water intake device for power generation of the present invention, the water pressure can be controlled according to the water level by providing the self-pressure valve. Therefore,
It is possible to realize a water intake device for power generation that is compact and does not require electric power or controlled air equipment.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a water intake facility shown as an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a self-pressure valve.

[Explanation of symbols]

3 floating body 4 pumps 6 Ground side piping (piping) 8 Flexible pipe (piping) 10 Self-pressure valve

Claims (2)

[Claims] 1. A floating body provided with a pump that is floated on water and sucks up water, ground equipment to which water is supplied from the floating body, and piping for sending water sucked up by the floating body to the ground equipment. And a self-pressure valve for controlling the pressure and flow rate of the taken-in water according to the pressure of the taken-in water. 2. The water intake device for power generation according to claim 1, wherein the pipe is stretchable in the longitudinal direction.