Flow balance discharge hole of water diversion type cascade series hydropower station

Abstract

The utility model provides a diversion type cascade series hydropower station flow balance discharge hole. The diversion type cascade series hydropower station flow balance discharge hole comprises a first diversion tunnel and a second diversion tunnel. The diameter of the first diversion tunnel is smaller than that of the second diversion tunnel; the first diversion tunnel and the second diversion tunnel are correspondingly connected with a plurality of diversion branch holes through first branch pipes respectively, the diversion branch holes are connected with corresponding units through unit ball valves, and the tails of the units are connected with the adjusting tank through tail water tunnels; and the second diversion tunnel is connected with a flow balance discharge hole through a second branch pipe, and the flow balance discharge hole is connected with the regulating reservoir through a discharge valve. A large-flow diversion tunnel is arranged, and a flow balance discharge hole is connected to the diversion tunnel, so that when a certain unit is overhauled and shut down, balanced discharge of water is achieved by means of the flow balance discharge hole, and normal power generation of the whole cascade series hydropower station is finally guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of hydropower station construction and hydropower station operation and maintenance, especially designs a diversion type cascade series water power station flow balance release hole. BACKGROUND

[0002] The diversion type cascade water power station is usually a plurality of water power stations connected in series by a plurality of diversion tunnels with gentle slope in the river section with large slope and concentrated drop, which is not convenient for dam building.

[0003] The same water power station has a plurality of diversion tunnels, and the same diversion tunnel corresponds to a plurality of diversion branch holes, and the diversion branch hole corresponds to a unit, when a unit fails, the ball valve of the corresponding unit needs to be closed, at this time, the flow in the diversion tunnel will be reduced, and then the discharge flow will be reduced, which will reduce the entire discharge flow, so that the discharge flow is unbalanced, and the normal power generation of the downstream unit is affected. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the existing technical problems, the main purpose of the utility model is to provide a diversion type cascade series water power station flow balance release hole, a large flow diversion tunnel is arranged, and a flow balance release hole is connected on the diversion tunnel, so that when a unit is closed for maintenance, the water balance discharge is realized by the flow balance release hole, and the normal power generation of the entire cascade series water power station is finally ensured.

[0005] In order to realize the above technical features, the purpose of the utility model is realized as follows: a diversion type cascade series water power station flow balance release hole, comprising a first diversion tunnel and a second diversion tunnel; the diameter of the first diversion tunnel is smaller than the diameter of the second diversion tunnel; the first diversion tunnel and the second diversion tunnel are respectively connected with a plurality of diversion branch holes through a first branch pipe, the diversion branch hole is connected with the corresponding unit through a unit ball valve, and the tail of the unit is connected with a regulating pool through a tail water tunnel; the second diversion tunnel is connected with a flow balance release hole through a second branch pipe, and the flow balance release hole is connected with the regulating pool through a release valve.

[0006] The water inlets of the first diversion tunnel and the second diversion tunnel are connected with the upstream reservoir at the same time.

[0007] The unit ball valve and the unit are arranged in the interior of the powerhouse.

[0008] The flow balance release hole is arranged below the powerhouse.

[0009] A flow regulating valve is arranged at the position behind the release valve, and the release valve and the flow regulating valve are arranged in the interior of the valve chamber.

[0010] The valve chamber and the powerhouse are shared.

[0011] The pipeline after the flow regulating valve is provided with an energy dissipation device for energy dissipation.

[0012] The regulating pool is provided with a water outlet connected with the lower power station through a plurality of lower water diversion tunnels and surge chambers.

[0013] The utility model has the advantages of:

[0014] 1. The utility model discloses a large-flow water diversion tunnel is arranged, and the flow balance release hole is connected on the water diversion tunnel, so that when a unit is closed for maintenance, the water balance release hole is used to balance and release water, and the normal power generation of the cascade series hydropower station is ensured.

[0015] 2. The water in the upstream reservoir can enter the corresponding water diversion branch through the first water diversion tunnel and the second water diversion tunnel, and the unit is supplied with water for power generation.

[0016] 3. The above-mentioned plant can effectively protect the unit ball valve and the unit.

[0017] 4. The above-mentioned arrangement ensures that the balanced water flow is released downward.

[0018] 5. The flow regulating valve can be used to control the release flow in the flow balance release hole, and the problem of flow reduction caused by unit maintenance is solved.

[0019] 6. The energy dissipation device can achieve good energy dissipation effect, and the water flow entering the regulating pool is smooth.

[0020] 7. The above-mentioned arrangement can be used to provide flow for the lower hydropower station. DETAILED DESCRIPTION

[0021] The utility model will be further described below in combination with the drawings and examples.

[0022] Fig. 1 It is a water diversion type cascade series hydropower station group schematic diagram of the utility model example.

[0023] Fig. 2 It is a longitudinal section view of a certain level hydropower station in the utility model example

[0024] In the figure: second diversion tunnel 1, second branch pipe 2, flow balance release hole 3, first branch pipe 4, diversion branch tunnel 5, powerhouse 6, unit ball valve 7, unit 8, tailrace tunnel 9, valve chamber 10, release valve 11, flow regulating valve 12, energy dissipation facility 13, regulating pool 14, outlet 15, lower-level diversion tunnel 16, surge chamber 17. DETAILED DESCRIPTION

[0025] The embodiments of the utility model will be further explained below with reference to the drawings.

[0026] Reference Figs. 1-2 A diversion type cascade series hydropower station flow balance release hole, including first diversion tunnel 18 and second diversion tunnel 1, the diameter of first diversion tunnel 18 is less than the diameter of second diversion tunnel 1, first diversion tunnel 18 and second diversion tunnel 1 are connected with multiple diversion branch tunnels 5 through first branch pipe 4 respectively, diversion branch tunnel 5 is connected with corresponding unit 8 through unit ball valve 7, the tail of unit 8 is connected with regulating pool 14 through tailrace tunnel 9, second diversion tunnel 1 is connected with flow balance release hole 3 through second branch pipe 2, flow balance release hole 3 is connected with regulating pool 14 through release valve 11. Through the above arrangement structure, by setting a large flow diversion tunnel and connecting flow balance release hole on the diversion tunnel, when a unit is closed for maintenance, water balance is realized by flow balance release hole, and the normal power generation of the entire cascade series hydropower station is finally ensured. In the specific working process, the diameter of second diversion tunnel 1 provided with flow balance release hole 3 is larger than that of other first diversion tunnel 18, because when the corresponding unit of other first diversion tunnel 18 is maintained, the flow originally from first diversion tunnel 18 needs to flow through second diversion tunnel 1, therefore the design flow and diameter of second diversion tunnel 1 are increased, which ensures that when the corresponding unit of first diversion tunnel 18 is maintained, the balance of the discharge flow is realized by opening flow balance release hole 3.

[0027] Further, the water inlets of first diversion tunnel 18 and second diversion tunnel 1 are both connected with the upstream reservoir. By being connected with the upstream reservoir, it is ensured that the water in the upstream reservoir can enter the corresponding diversion branch tunnel 5 through first diversion tunnel 18 and second diversion tunnel 1, and then supply water to the unit for power generation.

[0028] Further, unit ball valve 7 and unit 8 are arranged inside powerhouse 6. By using the above powerhouse 6, unit ball valve 7 and unit 8 inside can be effectively protected.

[0029] Further, flow balance release hole 3 is arranged below powerhouse 6. Through the above arrangement, it is ensured that the balanced water flows downward.

[0030] Further, a flow regulating valve 12 is arranged at the position behind the release valve 11, and the release valve 11 and the flow regulating valve 12 are arranged inside the valve chamber 10. The flow regulating valve 12 can be used to control the flow balance of the flow in the flow balance release hole 3, and further used to solve the problem of flow reduction caused by the unit maintenance. By arranging the release valve 11 and the flow regulating valve 12 inside the valve chamber 10, the valves can be protected.

[0031] Further, the valve chamber 10 and the plant 6 are shared. By sharing the plant, the construction cost can be reduced to a certain extent.

[0032] Further, an energy dissipation facility 13 is arranged on the pipeline behind the flow regulating valve 12, which can be used to dissipate energy. The water flow entering the regulating pool 14 can be smooth.

[0033] Further, the regulating pool 14 is provided with a water outlet 15, and the water outlet 15 is connected with the lower-level power station through a plurality of lower-level water diversion tunnels 16 and surge chambers 17. By the above arrangement, the flow of the lower-level power station can be provided.

[0034] The working process and principle of the utility model are as follows:

[0035] When a unit 8 of the power station fails and needs to be maintained, the unit ball valve 7 of the corresponding unit needs to be closed, which will cause the flow reduction. In order to balance the flow, the release valve 11 in the flow balance release hole 3 is opened, and the flow regulating valve 12 is adjusted according to the required flow, so as to balance the flow of the lower-level power station.

Claims

1. A flow balancing release hole for a run-of-river cascade series hydropower station, characterized in that: The first diversion tunnel (18) and the second diversion tunnel (1) are included; the diameter of the first diversion tunnel (18) is smaller than that of the second diversion tunnel (1); the first diversion tunnel (18) and the second diversion tunnel (1) are both connected with multiple diversion branch tunnels (5) through the first branch pipe (4) respectively; the diversion branch tunnel (5) is connected with the corresponding unit (8) through the unit ball valve (7); the tail of the unit (8) is connected with the regulating pool (14) through the tailrace tunnel (9); the second diversion tunnel (1) is connected with the flow balance discharge tunnel (3) through the second branch pipe (2); the flow balance discharge tunnel (3) is connected with the regulating pool (14) through the discharge valve (11).

2. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 1, characterized in that: The water inlets of the first diversion tunnel (18) and the second diversion tunnel (1) are both connected with the upstream reservoir.

3. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 1, characterized in that: The unit ball valve (7) and the unit (8) are arranged in the interior of the powerhouse (6).

4. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 3, characterized in that: The flow balance discharge tunnel (3) is arranged below the powerhouse (6).

5. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 4, characterized in that: The discharge valve (11) is provided with the flow regulating valve (12) after the position; the discharge valve (11) and the flow regulating valve (12) are arranged in the interior of the valve chamber (10).

6. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 5, characterized in that: The valve chamber (10) and the powerhouse (6) are shared.

7. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 5, characterized in that: The pipeline after the flow regulating valve (12) is provided with the energy dissipation facility (13) for energy dissipation.

8. The flow equalization release hole of the diversion type step cascade hydropower station according to claim 1, characterized in that: The regulating pool (14) is provided with the water outlet (15); the water outlet (15) is connected with the lower-level power station through multiple lower-level diversion tunnels (16) and the surge chamber (17).

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