CN116072314A - Nuclear power station double-layer containment structure for passive air cooling and nuclear power station with same - Google Patents

Abstract

The invention provides the technical field of passive air cooling, a nuclear power plant double containment shell structure for passive air cooling and the nuclear power plant, including a containment shell, a tuyere and a bracket. The containment vessel includes an outer containment vessel, the tuyere includes an air inlet, an air duct is provided on the outer side of the outer containment vessel, the air inlet is provided on the air duct, and the outer side of the outer containment vessel is provided the bracket. In the present invention, the air duct is arranged on the outer containment, and the method of opening holes at the bottom of the outer containment is used to transport the air flow instead of setting the deflector coaming in the ring cavity between the inner and outer containment, so the maintenance is simple and convenient, and the space is avoided. Inconvenience to installation and maintenance. By adopting the rigid support for fixing and supporting the external air duct of the outer containment, it can undertake the load-bearing and supporting functions of part of the outer containment, effectively solving the structural strength problem of the containment body after opening holes at the bottom of the outer containment, and It is conducive to the transformation of the existing double-layer containment.

Description

Nuclear power plant double-layer containment structure for passive air cooling and its nuclear power plant

technical field

The invention relates to the technical field of passive air cooling, in particular to a nuclear power plant double containment structure for passive air cooling and the nuclear power plant.

Background technique

At present, in the safety technology of nuclear power plants, there is a double-layer containment design that accommodates the primary circuit of the nuclear power plant (including the reactor core), wherein the inner containment is an airtight metal cover, and the outer containment is a vent hole. building. When a coolant loss accident or a main steam pipe rupture accident occurs in a pressurized water reactor nuclear power plant, the water vapor content in the inner containment vessel increases rapidly, which leads to a substantial increase in internal pressure and temperature, and further causes the metal body of the inner containment vessel to The temperature also rises. At this time, an effective natural circulation loop of air can be formed through the air inlet of the outer containment building, the annular air duct between the inner and outer containment, and the air outlet on the top of the outer containment. And through the higher temperature of the inner containment wall to provide natural circulation driving force, to provide a certain cooling capacity, to ensure that the temperature and pressure in the containment are lower than the safety limit, to ensure the safety of the nuclear power plant and the environment.

There are currently two main technical solutions for the air inlet of the outer containment. One is to use the bottom air intake, as shown in Figure 3. The other is shown in Figure 4, which is to enter the wind from the high side of the outer containment vessel, and set a deflector coaming in the inner and outer containment ring cavity to separate the ring cavity into two inner and outer ring cavities. The wind flowing in from the inlet first flows downward in the outer ring cavity, then turns back at the bottom of the ring cavity and flows upward, and flows out through the upper outlet.

The existing technical scheme 1 has a simple structure, but the air inlet is placed at the lower part, and the inlet wind is easily blocked by nearby buildings, and because the air inlet is opened close to the base, there are certain requirements for the structural strength of the outer containment; while the existing technical scheme 2. The outside of the air inlet is open and unobstructed, which is conducive to the use of the air flow near the ground, but the structure inside the ring cavity is narrow, which brings inconvenience to the maintenance and inspection of the system.

Contents of the invention

Aiming at the defects in the prior art, the object of the present invention is to provide a nuclear power plant double containment structure for passive air cooling and a nuclear power plant thereof.

A nuclear power plant double-layer containment structure for passive air cooling provided according to the present invention, including containment, tuyeres and brackets;

The containment vessel includes an outer containment vessel, the tuyere includes an air inlet, an air duct is provided on the outer side of the outer containment vessel, the air inlet is provided on the air duct, and the outer side of the outer containment vessel is provided the bracket.

In some embodiments, the containment vessel further includes an inner containment vessel, the inner containment vessel is arranged inside the outer containment vessel, and a ring cavity.

In some embodiments, an air duct is provided outside the outer containment vessel, one end of the air duct is connected to the outside of the outer containment vessel, and the other end of the air duct is an air inlet.

In some embodiments, an opening at one end of the air duct communicates with the annular cavity and is arranged at the outer bottom of the outer containment vessel, and the air inlet is arranged at the outer upper part of the outer containment vessel.

In some embodiments, the plurality of air inlets are arranged symmetrically outside the outer containment vessel.

In some implementations, the plurality of brackets are arranged symmetrically outside the outer containment vessel.

In some embodiments, the tuyere further includes an air outlet, and the air outlet is arranged on the top of the outer containment vessel.

In some embodiments, the air in the air inlet flows out from the air outlet through the annular cavity from bottom to top.

A nuclear power plant adopts the nuclear power plant double containment structure for passive air cooling.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, air ducts are arranged on the outer containment, and airflow is transported by opening holes at the bottom of the outer containment instead of setting guide coamings in the ring cavity between the inner and outer containment. The maintenance is simple and convenient, and avoids the The narrow space brings inconvenience to installation and maintenance;

2. In the present invention, the air inlet is provided on the upper part of the outer containment, and the air inlet is open and unobstructed, which is beneficial to the use of the air flow near the high place;

3. The present invention adopts a rigid support for fixing and supporting the external air duct of the outer containment, and the support can also undertake the load-bearing and supporting functions of part of the outer containment, which effectively solves the problem of opening a hole in the bottom of the outer containment. The structural strength of the main body, and is conducive to the transformation of the existing double-layer containment.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is the front view of the nuclear power plant double-layer containment structure that is used for passive air cooling according to the present invention;

Fig. 2 is the top view of the nuclear power plant double containment structure used for passive air cooling according to the present invention;

Fig. 3 is the front view of prior art scheme 1 in the background technology;

Fig. 4 is a front view of the prior art solution 2 in the background art.

Reference signs:

Inner containment 1 diversion shroud 5

Outer containment 2 bracket 6

Air inlet 3 Air duct 7

Air outlet 4 Ring cavity 8

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in FIGS. 1-2 , the present invention includes a containment vessel, a tuyere and a bracket 6 . The containment vessel includes an outer containment vessel 2, the tuyere includes an air inlet 3, an air duct 7 is provided on the outer opening of the outer containment vessel 2, and the air inlet 3 is arranged on the air duct 7, and the The support 6 is arranged outside the outer containment vessel 2 .

The containment vessel also includes an inner containment vessel 1 , the inner containment vessel 1 is arranged inside the outer containment vessel 2 , and an annular cavity 8 is provided between the inner containment vessel 1 and the interior of the outer containment vessel 2 . An air duct 7 is arranged outside the outer containment vessel 2 , one end of the air duct 7 is connected to the outer side of the outer containment vessel 2 , and the other end of the air duct 7 is an air inlet 3 . One end of the air duct 7 is connected to the annular cavity 8 by opening at the bottom of the outer containment vessel 2 , and the air inlet 3 is arranged at the upper part of the outer containment vessel 2 . A plurality of air inlets 3 are arranged symmetrically outside the outer containment vessel 2 . A plurality of brackets 6 are arranged symmetrically outside the outer containment vessel 2 . The tuyere also includes an air outlet 4 , and the air outlet 4 is arranged on the top of the outer containment vessel 2 . The wind in the air inlet 3 flows out from the air outlet 4 from bottom to top through the annular cavity 8 . A nuclear power plant adopts the above-mentioned nuclear power plant double containment structure for passive air cooling.

The air inlet 3 of the present invention is arranged above the side of the outer containment 2, and the wind from the air inlet 3 to the air outlet 4 still flows downward from the air inlet 3 to the bottom of the annular cavity 8 and then reversely flows from bottom to top until The process of the air outlet 4 flowing out, but different from the design of the upper air inlet 3 in Fig. 4, the present invention does not set a deflector shroud 5 between the outer containment 2 and the inner containment 1, but from top to bottom The lower air duct 7 is moved to the outside of the outer containment vessel 2, so that the flow mode in the prior art solution 2 is realized, but the narrowing of the inner space of the annular cavity 8 caused by the deflector shroud 5 is avoided. Inconvenience to system maintenance and inspection.

The air duct 7 outside the outer containment vessel 2 can be directly implemented under the design of the existing technical scheme 1 or technical scheme 2 after simple modification, or implemented independently under the new double-layer containment design:

The air duct 7 is arranged symmetrically on the outer side of the outer containment vessel 2 , one end of the air duct 7 , that is, the air inlet 3 is located at the upper part of the side, and the other end of the air duct 7 penetrates into the annular cavity 8 at the bottom of the outer containment vessel 2 . The air duct 7 itself is supported by a steel bracket, and the bracket 6 is connected to the outside of the outer containment vessel 2 to improve the mechanical performance of the containment body after one end of the air duct 7 penetrates the outer containment vessel. After the wind in the air duct 7 enters the lower part of the annular cavity 8, a large number of air outlets 4 can be evenly distributed on the outer containment shell 2. According to the principle of thermal expansion and contraction, cold air flows downward and hot air flows upward, and the annular cavity After absorbing the heat on the inner wall of the containment vessel, the airflow at the lower part of 8 quickly flows out from the air outlet 4 along the axial direction of the annular cavity 8, so as to improve the heat dissipation efficiency of the containment vessel body.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (9)

1. A nuclear power plant double-layer containment structure for passive air cooling, characterized in that it comprises a containment, tuyere and support (6); The containment vessel includes an outer containment vessel (2), the tuyere includes an air inlet (3), and an air duct (7) is arranged on an outer opening of the outer containment vessel (2), and the air duct (7) The air inlet (3) is arranged on the top, and the support (6) is arranged outside the outer containment (2). 2. The nuclear power plant double-layer containment structure for passive air cooling according to claim 1, characterized in that the containment further comprises an inner containment (1), and the inner containment (1) It is arranged inside the outer containment vessel (2), and an annular cavity (8) is arranged between the inner containment vessel (1) and the interior of the outer containment vessel (2). 3. The nuclear power plant double-layer containment structure for passive air cooling according to claim 1, characterized in that the air duct (7) is arranged outside the outer containment (2), and the air duct (7) One end is connected to the outer side of the outer containment (2), and the other end of the air duct (7) is the air inlet (3). 4. The nuclear power plant double-layer containment structure for passive air cooling according to claim 3, characterized in that one end of the air duct (7) has a hole connected to the annular cavity (8) and is arranged in the The outer bottom of the outer containment shell (2), and the air inlet (3) is arranged on the outer upper part of the outer containment shell (2). 5. The nuclear power plant double-layer containment structure for passive air cooling according to claim 1, characterized in that the plurality of air inlets (3) are arranged symmetrically outside the outer containment (2). 6. The nuclear power plant double-layer containment structure for passive air cooling according to claim 1, characterized in that the plurality of supports (6) are arranged symmetrically outside the outer containment (2). 7. The nuclear power plant double-layer containment structure for passive air cooling according to claim 1, characterized in that, the tuyere also includes an air outlet (4), and the air outlet (4) is arranged on the outer layer containment (2) top. 8. The nuclear power plant double containment structure for passive air cooling according to claim 2, characterized in that the wind in the air inlet (3) passes through the annular cavity (8) from bottom to top The air outlet (4) flows out. 9. A nuclear power plant, characterized in that it adopts the nuclear power plant double containment structure for passive air cooling according to any one of claims 1-8.

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