CN104810066A

CN104810066A - Pressure container with fins on outer wall surface

Info

Publication number: CN104810066A
Application number: CN201410036185.1A
Authority: CN
Inventors: 曹克美; 王佳赟; 张琨; 芦苇; 方立凯
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2014-01-26
Filing date: 2014-01-26
Publication date: 2015-07-29

Abstract

The invention relates to the technical field of safety of large passive pressurized water reactor nuclear power plants, and particularly discloses a pressure container with fins on the outer wall surface. The pressure container comprises a pressure container body, and fins fixed on the outer wall, wherein the pressure container body comprises a pressure container barrel with a cylindrical structure and a lower end socket with a cover structure at the lower end; M rows of fins are distributed on the outer wall of the lower end socket of the pressure container body along the longitudinal direction; N fins are arranged on each row in the circumferential direction; the fins do not contact with each other. According to the pressure container disclosed by the invention, triangular or quadrilateral fins are arranged on the outer wall, formation of longitudinal vortexes is facilitated, perturbation of fluid is enhanced, the cooperativity of a temperature field and a speed field is enhanced, and heat exchange is intensified, thereby improving the critical heat flux density of the fluid at the corresponding position on the outer wall surface of the pressure container. Thus, implementation of retention measures on in-pile melt in the nuclear power plant is facilitated, and the safety of the nuclear power plant in an accident condition is improved.

Description

Outside wall surface is with the pressure vessel of fin

Technical field

The invention belongs to large-scale passive PWR nuclear power plant security technology area, be specifically related to the pressure vessel of a kind of outside wall surface with fin.

Background technology

In the design of existing passive PWR nuclear power plant, have employed a lot of severe accident relieving strategy.Such as in AP1000 nuclear power plant, have employed the technology of being detained (IVR, In-vessel retention) in fused mass heap and guarantee that reactor pressure vessel low head did not lose efficacy, make reactor core melt retention in pressure vessel.IVR technology be under the condition had an accident in nuclear power plant by water piii reactor heap chamber, make reactor pressure vessel be dipped in water, rely on the boiling cooling pressure container wall of water and keep the integrality of pressure vessel.Such as, but the condition that the successful demand fulfillment of IVR measure is certain, the heat flow density of pressure vessel wall must be less than local critical heat flux density.The ratio of pressure vessel wall heat flow density and local critical heat flux density is one of key index evaluating IVR validity, and its ratio less explanation IVR measure allowance is larger.

Summary of the invention

The object of the present invention is to provide a kind of outside wall surface with the pressure vessel of fin, it can improve the critical heat flux density of pressure vessel outside wall surface, the validity of delay measure in fused mass heap under intensified response heap severe accident conditions.

Technical scheme of the present invention is as follows: a kind of outer wall is with the pressure vessel of fin, comprise the fin that pressure vessel and outer wall thereof are fixing, wherein, pressure vessel comprises the pressure vessel stack shell of cylindrical structure and the low head of lower end lid-like thereof, M that lower head of pressure vessel outer wall longitudinally distributes arranges, often arrange and circumferentially have N number of fin, and each fin does not contact with each other each other.

Fork row arrangement or order arrangement between each row's fin on described lower head of pressure vessel outer wall, and the arranged direction of fin is different.

Described fin and the direct forging molding of pressure vessel or fin are directly soldered in pressure vessel outside wall surface.

Described lower head of pressure vessel outer wall longitudinally distributes 2 rows, 3 rows or 4 rows, often arranges and circumferentially has 4,6 or 8 fins.

It is described that to be positioned at first row fin bottom low head with the angle β carrying out flow path direction be 10 ° ~ 60 °.

Described fin be fixed on base length L on low head outer wall and perpendicular to low head outside wall surface height H between ratio be 1 ~ 10.

All fins on described pressure vessel outer wall are triangular structure or quadrilateral structure.

Remarkable result of the present invention is: a kind of outside wall surface of the present invention is with the pressure vessel of fin, the fin of triangle or quadrilateral is furnished with at its outer wall, be conducive to the formation of longitudinal Vortex, fluid is through triangle or quadrilateral fin, before and after it, pressure reduction impels the formation of Secondary Flow, thus defines the longitudinal Vortex vertical with main flow direction in the downstream of fin, enhances the disturbance of fluid, enhance the concertedness of temperature field and velocity field, enhance heat exchange.In addition, fin of the present invention can have many rows, and the arranged direction between each row's fin is different, thus further enhancing the formation in whirlpool, strengthen fluid and stir and make muddy effect, thus improve the critical heat flux density of fluid in pressure vessel outside wall surface corresponding position, thus be conducive to fused mass delay measure in nuclear power plant's heap of implementing, improve the security of nuclear power plant under accident conditions.

Accompanying drawing explanation

Fig. 1 is the construction of pressure vessel schematic diagram of a kind of outside wall surface of the present invention with fin;

Fig. 2 is the backplan of Fig. 1;

Fig. 3 is the structural representation of fin in Fig. 1;

Fig. 4 is the side view of fin in Fig. 1;

Fig. 5 is the construction of pressure vessel schematic diagram of another kind of outside wall surface of the present invention with fin;

Fig. 6 is the backplan of Fig. 5;

Fig. 7 is the structural representation of fin in Fig. 5;

Fig. 8 is the side view of fin in Fig. 5;

In figure: 1, pressure vessel; 2, fin.

Embodiment

Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.

As shown in Fig. 1 ~ 8, a kind of outside wall surface is with the pressure vessel of fin, comprise fin 2 fixing on pressure vessel 1 and outer wall thereof, wherein, pressure vessel 1 comprises the pressure vessel stack shell of cylindrical structure and the low head of lower end lid-like thereof, M that pressure vessel 1 low head outer wall longitudinally distributes arranges, often arrange and circumferentially have N number of fin 2, fin 2 and pressure vessel 1 directly forging molding or fin 2 are directly soldered in pressure vessel 1 outside wall surface, and each fin 2 does not contact with each other each other, such as, pressure vessel 1 low head outer wall longitudinally distributes 2 rows, 3 rows or 4 rows, often arrange and circumferentially have 4, 6 or 8 fins 2, fork row arrangement or order arrangement between each row's fin 2 on pressure vessel 1 low head outer wall, and the arranged direction of fin 2 is different, being positioned at first row fin bottom low head 2 with the angle β carrying out flow path direction is 10 ° ~ 60 °, all fins 2 on pressure vessel 1 outer wall are triangular structure or quadrilateral structure, and each fin 2 be fixed on base length L on low head outer wall and perpendicular to low head outside wall surface height H between ratio be 1 ~ 10.

A kind of outside wall surface of the present invention is with the pressure vessel of fin, and when there is major accident when nuclear power plant, core meltdown and caving in, fused mass is gathered in pressure vessel 1 low head gradually.In above process, power plant will implement heap chamber by automatic or manual mode and flood, and be immersed in water, the water of pressure vessel heat external, water is seethed with excitement, thus take away pressure vessel heat, maintain pressure vessel not damaged by pressure vessel 1.The present invention forms fin in pressure vessel outside wall surface, fin is triangle or quadrilateral, with carry out flow path direction and form certain angle, fluid is made to define the longitudinal Vortex vertical with main flow direction in fin downstream, enhance the disturbance of fluid, enhance the concertedness of temperature field and velocity field, enhance heat exchange.In addition, fin of the present invention can have many rows, and the arranged direction between each row's fin is different, thus further enhancing the formation in whirlpool, strengthen fluid and stir and make muddy effect, thus the critical heat flux density of pressure vessel 1 outside wall surface corresponding position is improved, be conducive to implementing fused mass in nuclear power plant's heap and be detained measure, improve the security of nuclear power plant under accident conditions.

Claims

1. an outer wall is with the pressure vessel of fin, it is characterized in that: comprise the fin (2) that pressure vessel (1) and outer wall thereof are fixing, wherein, pressure vessel (1) comprises the pressure vessel stack shell of cylindrical structure and the low head of lower end lid-like thereof, M that pressure vessel (1) low head outer wall longitudinally distributes arranges, often arrange and circumferentially have N number of fin (2), and each fin (2) does not contact with each other each other.

2. a kind of outer wall according to claim 1 is with the pressure vessel of fin, it is characterized in that: fork row arrangement or order arrangement between each row's fin (2) on described pressure vessel (1) low head outer wall, and the arranged direction of fin (2) is different.

3. a kind of outer wall according to claim 1 is with the pressure vessel of fin, it is characterized in that: described fin (2) and pressure vessel (1) directly forging molding or fin (2) are directly soldered in pressure vessel (1) outside wall surface.

4. a kind of outer wall according to claim 1 is with the pressure vessel of fin, it is characterized in that: 2 rows that described pressure vessel (1) low head outer wall longitudinally distributes, 3 rows or 4 rows, often arranges and circumferentially has 4,6 or 8 fins (2).

5. any one outer wall according to claims 1 to 4, with the pressure vessel of fin, is characterized in that: described to be positioned at first row fin (2) bottom low head with the angle β carrying out flow path direction be 10 ° ~ 60 °.

6. any one outer wall according to claims 1 to 4, with the pressure vessel of fin, is characterized in that: described fin (2) be fixed on base length L on low head outer wall and perpendicular to low head outside wall surface height H between ratio be 1 ~ 10.

7. any one outer wall according to claims 1 to 4, with the pressure vessel of fin, is characterized in that: all fins (2) on described pressure vessel (1) outer wall are triangular structure or quadrilateral structure.