Sediment releasing method for water intake of low-head river channel pivotal power station

Abstract

The invention relates to a sediment releasing method for a water intake of a low-head river channel pivotal power station and belongs to the field of water conservancy projects, under the IPC numbers of E02B9 / 00, E02B9 / 04 and E02B1 / 00. According to the method, a sediment trap is arranged along the whole front edge of the power station water intake, a gallery for sediment transport is arranged in front of the sediment trap and connected with a dam base sediment tunnel, the top of the gallery for sediment transport is provided with a horizontal joint sediment outlet, the width of the horizontal joint sediment outlet gradually increases from the upstream, the cross section of the gallery for sediment transport gradually increases from the upstream. The sediment trap is used with the variable width joint type gallery for sediment transport so as to achieve the function of an intercepting channel, an elongated scour funnel can be formed in front of the sediment trap, and the sediment releasing effect that sediment is released in front of the power station water intake is truly achieved.

Description

Technical field: [0001] The invention relates to a technique for removing coarse-grained sediment from a water inlet of a hydropower station, in particular to a technique for discharging sand using variable-width and narrow-slit sand-discharging corridors 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 destructive effect of sediment wear on turbines is very serious. For high water head projects, setting up sand discharge bottom holes or flood discharge and sand discharge holes is an effective measure to reduce the passage of coarse sand. The sand discharge bottom hole 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 flow of coarse sand. For low-head riverbed hu...

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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