Flow-guide type grading energy-dissipation defoaming siphonic water-collecting well in front of weir flow and method

Abstract

The invention relates to a flow-guide type grading energy-dissipation defoaming siphonic water-collecting well in front of weir flow. The siphonic water-collecting well comprises a water inlet, a well body and a water outlet. A downflow weir is arranged in the middle of the well body and partitions the well body into a weir front section and a weir back section. The water inlet and the water outlet are connected with the bottom of the weir front section and the bottom of the weir back section correspondingly. The weir front section is of a gradual-changing diffusion type. A flow guide pier is arranged right ahead of the water outlet. The weir back section is provided with a plurality of layers of horizontal pore plates and vertical pore plates. The gradual-changing diffusion type well body part is adopted for the weir front section, the flow guide pier is arranged at the water outlet, the multiple layers of pore plates are arranged behind the weir, bubbles in water discharged from the siphonic water-collecting well can be greatly decreased by improving the well body shape and additionally arranging water conservancy project facilities including the pore plates and the like, and influence on the surrounding environment is reduced. By adoption of the siphonic water-collecting well and a method, the work amount of the siphonic water-collecting well can be greatly reduced on the premise that bubble pollution interference is eliminated and relative clean water drainage is achieved, the building cost is lowered, and manpower and material resources are reduced.

Description

technical field [0001] The invention relates to a diversion-type graded energy-dissipating and defoaming siphon well before a weir flow and a method thereof, which is a hydraulic facility and a method, and an environmental protection facility and a method. Background technique [0002] Coastal thermal power or nuclear power plants that adopt the direct current cooling method generally have drainage siphon wells to reduce the head of the water pump by using the siphon effect and save energy. In the siphon well, there is an outflow weir whose top elevation exceeds the average tidal level, so as to reduce the influence of the tide level change in the open sea on the upstream section of the siphon well. Most of these weirs use thin-walled weirs, practical weirs, and wide-crested weirs for free overflow drainage, resulting in strong water-air mixing during the water drop behind the weirs, resulting in hard-to-break yellowish foam, forming foam pollution areas , the splashed salt...

AI Technical Summary

Problems solved by technology

The existing siphon well project, in order to save costs and reduce the amount of earthwork works, is often small in size (it can save investment ranging from tens of millions to hundreds of millions), which brings problems: the flow state in front of the weir is very poor, There are intermittent high water bodies, and the turbulent intensity of the water passing through the weir is high, which has an adverse effect on the defoaming behind the weir

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