Pressure equalizing density lock

Abstract

The invention provides a pressure equalizing density lock, which comprises a constant temperature section casing which is provided with a cooling water inlet and a cooling water outlet, a constant temperature section which is positioned in the constant temperature section casing and is formed by a constant temperature section tube bundle, and a density layering section which is formed by a densitylayering section casing and a density layering section tube bundle positioned in the density layering section casing, wherein, the density layering section is connected above the constant temperaturesection; a turbulent pressure equalizing section is arranged above the density layering section; the turbulent pressure equalizing section comprises a turbulent pressure equalizing section casing anda punching taper structure arranged therein; a round hole is arranged on the punching taper structure; and a burbling wing is arranged outside the round hole. The invention adopts a stable three-stage layering structure, effectively solves the problem of uneven pressure among passages caused by uneven velocity distribution at the upper part, eliminates the interfacial oscillation and interfacialwave transfer among the passages, enhances the stability of density layering in the density lock and realizes the active isolation of a primary coolant loop and an inactive residual heat removal loopduring the stable operation of a reactor.

Description

(1) Technical field [0001] The invention relates to reactor passive safety system equipment, in particular to a pressure-equalizing density lock structure installed on a pipeline loop between a reactor passive waste heat discharge system and a main loop system. (2) Background technology [0002] In the 1980s, research institutions represented by Westinghouse Corporation of the United States adopted passive safety technology in the design of reactors for the first time. So far, many nuclear power plants have adopted passive safety systems to ensure the safe operation of reactors. An important approach in these passive security systems is density lock technology. The concept of "density lock" was first proposed by Babala et al. They believed that a boundary surface could be formed between two fluids with a difference in density. Under certain conditions, this boundary could effectively prevent the interaction between the two fluids. Stirring, use this principle to make an app...

AI Technical Summary

Problems solved by technology

The existing density lock structure has the following defects: the first, the existing density lock structure is composed of many small channels with openings at both ends, and there is no device above it for uniform fluid flow velocity field or consuming fluid turbulent kinetic energy

When there is fluid flow above the density lock, the change of velocity will lead to uneven pressure distribution among the channels in the density lock, which will lead to the formation of a large circulation between the sub-channels, thereby destroying the stability of fluid stratification; second, Due to the existence of uneven velocity distribution, changes in the velocity field will cause changes in the pressure distribution between the channels of the density-locked structure. Therefore, in the existing density-locked structure, the layered interface in each small channel of the density layered section will oscillate up and down. , which leads to uneven temperature distribution in the radial direction of the density lock, and the radial temperature difference will lead to radial heat transfer of the fluid in the small channel, thereby destroying the interface stability of the small channel

In summary, when the fluid flows above the density lock, the existing density lock structure cannot solve the problem of pressure unevenness caused by the change of the flow field, resulting in natural circulation between the density lock channels, interface oscillation and radial temperature uneven distribution problem

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