Siphon well for nuclear power

Abstract

The invention provides a siphon well for nuclear power. A double-layer practical weir is arranged in the siphon well; the double-layer practical weir is downwards inclined along the water flow direction; the double-layer practical weir comprises a lower-layer weir and an upper-layer weir; and a lower-layer flow channel and an upper-layer flow channel for water flow to pass through are respectively arranged above the lower-layer weir and the upper-layer weir. According to the technical scheme, the double-layer combined practical weir siphon well is arranged in a nuclear power plant, foam at a water outlet can be effectively reduced, the sea area environment is improved, and therefore the later maintenance cost and the later sea area environment treatment cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of siphon wells, in particular to a siphon well for nuclear power. Background technique [0002] Binhai nuclear power plants that adopt the once-through cooling method are generally equipped with drainage siphon wells to reduce the head of the water pump by using the siphon effect. In the siphon well, there is an overflow weir whose top elevation exceeds the average tidal level, so as to reduce the impact of the tide level change in the open sea on the upstream section of the siphon well. Thin-walled weir crests are often used in projects to freely overflow and drain water, resulting in strong water-air mixing during the water drop behind the weir, resulting in light yellow foam that is not easy to burst, forming a foam pollution area, and the splashed salt mist will also Corrosion of the metal structures near the drain, and in order to reduce the amount of work in the design of many power stations, the siz...

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Problems solved by technology

The fluctuation of water flow will also affect the stability of the water flow on the weir. After the water flow passes through the overflow weir, a vortex will be formed behind the weir wall. At the same time, a second vortex will be generated along the flow direction of the water flow. The two vortexes will generate a large number of air bubbles, which will seriously affect the water quality. and senses

When the water level in the open sea is low, the water drops greatly, and a large number of air bubbles are generated during the hydraulic jump behind the weir. They fail to rise to the water surface in time, and then enter the downstream drainage pipes, causing the air bubbles to fail to float up and break.

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