Composite piano overflow weir type siphon well and method

Abstract

The invention relates to a compound key overflow weir type siphon well which comprises at least one single well combination. Each single well combination comprises a vertical well with a water inlet culvert pipe, the vertical wells are connected with overflow connecting wells, the overflow connecting wells are connected with water delivery culvert pipes, and compound key overflow weirs are arranged between the vertical wells and the overflow connecting wells; the compound key overflow weirs comprise weir bodies, positive triangular piers and reverse triangular piers which are provided with horizontal bottom surfaces are staggered on the tops of the weir bodies, the lengths of the bottom surfaces of the positive triangular piers and the reverse triangular piers along the direction of water flow are larger than the thicknesses of the tops of the weir bodies, and front weir cantilevers and rear weir cantilevers are formed. The compound key overflow weir type siphon well has the advantages that the compound key overflow weirs are used as flow passing facilities and bubble inhibiting schemes, accordingly, the single-width flow passing ability of the overflow weirs of the siphon well can be improved, the drop flow difference between the overflow weirs of the siphon well and open seas can be reduced, bubbles mixed in the water flow which flows through the weirs can be inhibited, and influence on ambient environments can be reduced; the engineering cost can be lowered, energy can be effectively dissipated, the bubbles can be effectively eliminated, and relatively clean water can be drained.

Description

technical field [0001] The invention relates to a composite piano overflow weir type siphon well and method, which is a hydraulic facility and method, and a drainage siphon well and method for discharging cooling water in thermal nuclear power plants. Background technique [0002] Traditional thermal nuclear power plant drainage siphon wells generally have water in the middle, and in order to reduce the impact of tide level changes in the open sea on the upstream section of the siphon well, overflow weirs with top elevations higher than the average tidal level are installed in the thermal nuclear power plant siphon wells, and the common ones are thin Wall weirs, wide-crested weirs and utility weirs. On the other hand, with the increase of power station capacity in recent years, the flow rate of the siphon well is relatively large in all seasons. In order to save construction costs, the size of the siphon well itself is often small. There are following problems in this desig...

AI Technical Summary

Problems solved by technology

[0003] 1. If diversion and rectification measures are not taken in the upstream pool of the siphon well, after the inflow in the middle of the siphon well suddenly expands, the mainstream diffusion distance will not be enough, and there will be obvious backflow areas on both sides of the water inlet, resulting in poor flow state upstream of the siphon well and overflow In the middle of the weir, there will be intermittent high water bodies, which will affect the downstream flow regime

[0004] 2. Due to the low tide level in the open sea, the top of the weir of the siphon well is mostly free overflow, the fall behind the weir is too large, and a large amount of air is mixed in the process of hydraulic jump energy dissipation. If the downstream distance of the siphon well is not enough, a large number of air bubbles cannot rise to the The water surface is easily brought into the downstream box culvert, which will form a foam pollution area in the sea area near the outfall

A large amount of yellowish foam enters the sea with the drainage, which will form a foam pollution area in the sea near the drain, affecting the perception of the environmental waters, and the splashing salty mist will corrode the metal structures near the drain

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