Hydropower station ground plant tail water outlet structure and hydropower station for hydropower station ground plant tail water outlet structure

Abstract

The invention relates to a hydropower station ground plant tail water outlet structure which comprises a tail water pipe connected with a hydraulic turbine set. The tail end of the tail water pipe is provided with a tail water pressure pond which is a pond with the opened top and the closed bottom and side faces, the tail water pressure pond is communicated with the tail water pipe, and the top of the tail water pressure pond is provided with an overflow opening capable of draining tail water in the tail water pressure pond downstream; and the overflow face elevation of the overflow opening is lower than the downstream maximum flood control water level and is higher than the downstream design tail water level. The hydropower station ground plant tail water outlet structure is feasible in technology, simple in structure, reliable in running, suitable for hydropower stations with large tail water level variation amplitude and without needs for sufficiently using the lowest tail water level.

Description

technical field [0001] The invention belongs to water conservancy and hydropower technology, and in particular relates to a tail water outlet structure of a ground powerhouse of a hydropower station and the hydropower station. Background technique [0002] The draft pipe of the hydropower station is located under the runner of the turbine and is an important flow-passing part of the impact turbine. It collects and guides the water flow from the runner outlet to the downstream, and uses the water head from the runner outlet to the downstream water level to recover part of the kinetic energy of the runner outlet. The water head from the outlet of the runner to the downstream water level mainly depends on the installation elevation of the turbine. The installation elevation is mainly controlled by the suction height of the turbine, the smaller the suction height, the lower the installation elevation of the turbine. [0003] The traditional structure of the tail water outlet of...

AI Technical Summary

Problems solved by technology

At this time, the assembly site and generator floor floor elevation determined according to the turbine elevation are lower than the downstream maximum flood control level, and the downstream tailrace platform and the flood control wall on the downstream side of the approach road need to be designed relatively high, resulting in poor field of view , high project investment, drainage costs during operation and safety risks

In order to reduce the height of the flood wall, the high-rise of the assembly yard and the generator floor will be raised, which will lead to an increase in the height of the factory building, an increase in the investment in the factory building project, an increase in the length of the turbine generator shaft, poor operating stability of the unit, and vibration of the factory building, etc. question

[0007] For the ground powerhouse of the hydropower station under the action of high variable amplitude flood level, if the traditional tailwater outlet structure is adopted, the installation elevation of the turbine is set to be lower to use the lowest tailwater level of the downstream river to generate electricity, which will also cause the civil engineering excavation of the ground powerhouse Large amount, when the downstream maximum flood control level will also bring about the anti-floating stability of the factory building, resulting in an increase in the amount of backfill concrete

If the installation elevation of the turbine is raised and the lowest tailwater level of the downstream river is not used to generate electricity, it will not only cause waste of water head, but also reduce the utilization hours of the turbine for power generation, resulting in a large loss of water energy

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