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Stepped flow distribution device and stepped flow distribution structure for lower cavity of nuclear reactor

A flow distribution device and a technology for a nuclear reactor, which are applied in the field of a stepped flow distribution device and a distribution structure in a lower chamber of a nuclear reactor, can solve problems such as uneven distribution of coolant flow at a core inlet, achieve stable flow state, and eliminate eddy currents. Trend, effect of increasing eddy elimination and equalizing area

Active Publication Date: 2021-01-05
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the existing flow distribution structure and the secondary flow distribution structure formed by the lower support plate of the core can improve the uniformity of the flow distribution of the coolant flow at the core inlet to a certain extent, it still leads to uneven distribution of the coolant flow at the core inlet sex

Method used

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  • Stepped flow distribution device and stepped flow distribution structure for lower cavity of nuclear reactor
  • Stepped flow distribution device and stepped flow distribution structure for lower cavity of nuclear reactor
  • Stepped flow distribution device and stepped flow distribution structure for lower cavity of nuclear reactor

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Embodiment 1

[0044] Such as Figure 1-Figure 4 As shown, a stepped flow distribution device for the lower chamber of a nuclear reactor includes a pressure vessel 1, a hanging basket 2 and a support plate 4 under the core, and the hanging basket 2 and the lower support plate 4 are placed in the pressure vessel 1, The hanging basket 2 is installed on the lower support plate 4 of the core, and an annular descending chamber 5 is formed between the hanging basket 2 and the pressure vessel 1, and a lower chamber is formed in the pressure vessel 1 under the lower support plate 4 of the core 6. The lower core support plate 4 is provided with a number of flow distribution holes, and also includes a flow distribution structure 3 arranged in the lower chamber 6, and the flow distribution structure 3 includes N transverse shrouds 304 and N longitudinal shrouds Plate 303, N horizontal shrouds 304 and N longitudinal shrouds 303 are mutually orthogonal to form a stepped structure, said transverse shrouds...

Embodiment 2

[0051] Such as Figure 1-Figure 4 As shown, this embodiment is based on Embodiment 1. The lower end of the flow distribution structure 3 is recessed upwards to form a cavity 7. Its main function is to increase the space in the central area of ​​the bottom of the lower chamber 6 and avoid the The cooling liquid forms a large pressure difference in the central area of ​​the lower chamber 6; the depth of the inner concave cavity 7 is 1-2 times the height of a single longitudinal enclosure 303.

[0052] In this embodiment, the top of the concave cavity 7 is a circular plate, and the side wall is an annular plate. The side wall of the concave cavity 7 is arranged on the inner side of the bottommost longitudinal wall 303 of the flow distribution structure 3 and is parallel to the longitudinal wall 303. The top of the cavity 7 is arranged in parallel with the transverse enclosure 304, and the transverse enclosure 304 at the bottom of the stepped structure is an annular plate whose wi...

Embodiment 3

[0054] Such as Figure 1-Figure 4 As shown, this embodiment is based on Embodiment 1, and the inner diameters of several transverse through holes 305 opened on the transverse shroud 304 gradually increase from the center of the flow distribution structure 3 to the edge, so that the middle of the lower chamber 6 The cooling liquid in the area is diffused to the edge, avoiding the problem that the flow rate in the central area of ​​the core inlet is too large, while the flow rate of the cooling liquid in the edge part is too small; , compared with the traditional flow distribution device, the effective area of ​​the vertical through hole 306 is increased, the drag coefficient is reduced, and the pressure loss along the cooling liquid is reduced after passing through the flow distribution structure 3 .

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Abstract

The invention discloses a stepped flow distribution device and a stepped flow distribution structure for lower cavity of a nuclear reactor, the stepped flow distribution device comprises a pressure vessel, a hanging basket and a reactor core lower support plate, the hanging basket and the reactor core lower support plate are arranged in the pressure vessel, the hanging basket is arranged on the reactor core lower support plate, and an annular descending cavity is formed between the hanging basket and the pressure vessel; wherein a lower cavity is formed below the reactor core lower support plate in the pressure vessel, a plurality of shunt through holes are formed in the reactor core lower support plate, the flow distribution structure is arranged in the lower cavity, the flow distributionstructure comprises N transverse coamings and N longitudinal coamings, the N transverse coamings and the N longitudinal coamings are mutually orthogonal to form a stepped structure, a plurality of transverse through holes are formed in the transverse coaming, a plurality of vertical through holes are formed in the longitudinal coaming, and N is larger than or equal to 2. The flow distribution device is good in flow distribution effect, small in resistance coefficient and compact in structure, and is used for vortex elimination and uniform flow distribution of cooling liquid entering the lowercavity of the pressure container.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a stepped flow distribution device and a distribution structure for a lower chamber of a nuclear reactor. Background technique [0002] The nuclear fuel in the pressurized water reactor maintains a controllable chain fission reaction in the reactor to generate energy, and the coolant entering the core absorbs the energy generated by the fission to cool down the fuel assembly. The temperature of the cooling liquid rises after absorbing energy. Under the forced circulation of the main pump of the system, it flows through the steam generator through the main pipeline and exchanges heat with the secondary circuit. The cooled cooling liquid then recirculates into the core. The uniformity of the coolant in the core directly affects the temperature distribution of the core, which is related to whether the core temperature can be derived in a timely and effective manner, and is als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/04G21C15/12
CPCG21C19/04G21C15/12Y02E30/30
Inventor 钟元章曹锐胡雪飞王庆田陈仕龙王仲辉李燕赵伟罗英李浩何培峰邓朝俊李娜杨平饶琦琦王尚武吴冰洁舒翔陆祺
Owner NUCLEAR POWER INSTITUTE OF CHINA