Sediment disposal method for water inlets of power station

Abstract

The invention relates to a sediment disposal method for water inlets of a power station, belonging to the field of hydraulic engineering. The sediment disposal method is characterized in that a sediment barrier is laid at the front edge of the water inlet of the power station along the whole line; a sediment transporting gallery is laid in front of the sediment barrier along the whole line and is connected with a sediment disposal hole of a dam foundation; a horizontal seam sediment disposal opening is formed in the top of the sediment transporting gallery; the width of the horizontal seam sediment disposal opening is gradually narrowed from the upstream; a cross section of the sediment transporting gallery is gradually increased from the upstream; the sediment barrier is matched with the width-variable seam type sediment transporting gallery for use to play a role of a sediment trapping trough; a strip-shaped flushing funnel can be formed in front of the sediment barrier, so that the sediment disposal effect of cleaning the sediment in front of the water inlet of the power station is really realized.

Description

Technical field: [0001] The invention relates to a technology for removing coarse particles of sand from a water inlet of a hydropower station, and in particular to a technology for removing sand by adopting a widening and narrow-slit sand discharge corridor of unequal width, which belongs to the field of water conservancy engineering. The IPC international patent classification number is E02B9 / 00, E02B9 / 04, E02B1 / 00. Background technique: [0002] On sandy rivers, the damaging effect of sand abrasion on hydraulic turbines is very serious. For high-head hubs, setting up bottom holes or flood discharge tunnels is an effective measure to reduce the amount of coarse sand passing through. The bottom hole of sand discharge is generally arranged at the lower part of the water inlet of the power station, and the flood discharge is used to form a scour funnel in front of the water inlet of the power station to reduce the coarse sand passing through the machine. For a low-head riverbed...

AI Technical Summary

Problems solved by technology

For low-head riverbed hubs, it is difficult to arrange the sand discharge bottom holes at the lower part of the water inlet of the power station. They are arranged on both sides of the water inlet of the power station. The scope of the scour funnel is small, and it is difficult to achieve the ideal sand discharge effect.

In addition, the front edge of the water inlet of this type of power station is generally relatively long, and a single sand discharge hole cannot achieve its purpose at all, and it is difficult to arrange multiple sand discharge holes along the front edge of the water inlet.

The Bapanxia Hydropower Station set up equal-width gaps to discharge sand on the top of the corridor on the bottom plate of the inlet section of the power station. The operation results show that the flow rate at the gate is small, the flow capacity of the sand-drawing hole is small, the sand-drawing range is not large, and it is easy to generate sand in the corridor. clogging

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