A helium circulation loop airflow isolation device

Abstract

The present invention discloses a helium circulation loop airflow isolation device, which relates to the technical field of airflow circulation loops, and includes a cold pipe assembly, a heat pipe assembly and an insulation shell. The cold pipe assembly includes a cold pipe shell with a semicircular cross-section, and a cold pipe valve is connected to the cold pipe shell through an adapter; the heat pipe assembly includes a heat pipe shell with a semicircular cross-section, and a heat pipe valve is connected to the heat pipe shell through an adapter; the plane side of the heat pipe shell can be fitted and connected with the corresponding plane side of the cold pipe shell; the insulation shell is arranged on the outside of the heat pipe shell and the cold pipe shell. The purpose of the present invention is to provide a helium circulation loop airflow isolation device to solve the problems existing in the above-mentioned prior art, and the cold pipe valve and the heat pipe valve can be opened or closed without disassembling the cold pipe. The helium circulation loop airflow isolation device of the present invention can open or close the cold pipe valve and the heat pipe valve without disassembling the cold pipe.

Description

Technical Field

[0001] The invention relates to the technical field of airflow circulation loops, and in particular to an airflow isolation device for a helium circulation loop. Background Art

[0002] A heating device, such as a nuclear reactor, produces 750°C high-temperature helium, which flows into a steam generator through a heat pipe to heat liquid water. The liquid water produces 571°C high-temperature, high-pressure superheated steam to drive a steam turbine to generate electricity. After the heat exchange is completed, the temperature of the 750°C high-temperature helium is reduced to 250°C, and then it is sent back to the reactor core through a main helium fan and a cooling pipe for heating, thus forming a closed helium circulation loop.

[0003] The helium closed circulation loop is provided with main nuclear blowers, steam generators and other working parts, which need to be regularly inspected or replaced. When inspecting or replacing these working parts, the airflow needs to be cut off, that is, the valves on the heat pipe and the cold pipe are closed to achieve physical isolation of the helium circulation loop between the nuclear reactor and the steam generator. In the helium circulation loop known to the inventor, the heat pipe and the cold pipe are coaxially sleeved, with the heat pipe inside and the cold pipe outside the heat pipe; the valve in the inner pipe of this coaxial sleeve arrangement of the heat pipe and the cold pipe is difficult to install, and when closing or opening the valve, the external cold pipe must be disassembled, making maintenance difficult. Summary of the invention

[0004] The object of the present invention is to provide a helium circulation loop airflow isolation device to solve the problems existing in the above-mentioned prior art, and to open or close the cold pipe valve and the hot pipe valve without disassembling the cold pipe.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a helium circulation loop airflow isolation device, comprising:

[0007] A cold pipe assembly, the cold pipe assembly comprising a cold pipe shell with a semicircular cross section, the cold pipe shell being connected to a cold pipe valve via an adapter;

[0008] A heat pipe assembly, the heat pipe assembly comprising a heat pipe shell with a semicircular cross section, the heat pipe shell being connected to a heat pipe valve via an adapter; the plane side of the heat pipe shell being able to be fitted and connected with the plane side of the corresponding cold pipe shell;

[0009] The heat-insulating shell is arranged outside the heat pipe shell and the cold pipe shell.

[0010] Preferably, the cold pipe shell comprises a first steel plate with a semicircular cross-section and a second steel plate with a rectangular structure, and the arc-shaped opening side of the first steel plate is fixedly and sealedly connected to the second steel plate; the heat pipe shell and the cold pipe shell have the same structure.

[0011] Preferably, one end of the adapter is fixedly connected to the cold pipe shell or the heat pipe shell, and the other end is connected to the cold pipe valve or the heat pipe valve via a connecting flange.

[0012] Preferably, the adapter is a special-shaped cylindrical structure, the cross-section of the end connected to the connecting flange is a circular structure, and the cross-section of the end connected to the cold pipe shell or the heat pipe shell is a semicircular structure.

[0013] Preferably, the adapter transitions axially from a circular interface structure close to one end of the connecting flange to a semicircular interface structure close to one end of the cold pipe shell or the heat pipe shell.

[0014] Preferably, the plane side of the heat pipe shell and the plane side of the cold pipe shell are respectively provided with extended flanges, and threaded holes are opened on the extended flanges. When the heat pipe shell and the cold pipe shell are fitted and connected, the threaded holes of the cold pipe shell are fixedly connected with the corresponding threaded holes of the heat pipe shell by bolts.

[0015] Preferably, one end of the heat pipe shell is connected to the helium outlet of the heating device, and the other end is connected to the helium inlet of the steam generator; one end of the cold pipe shell is connected to the helium inlet of the nuclear reactor, and the other end is connected to the helium outlet of the steam generator; both ends of the heat pipe valve are arranged in the middle of the heat pipe shell through an adapter, and both ends of the cold pipe valve are arranged in the middle of the cold pipe shell through an adapter.

[0016] Preferably, the hot pipe valves and cold pipe valves are arranged alternately.

[0017] Preferably, both the hot pipe valve and the cold pipe valve are provided with a valve driving actuator, and the valve driving actuator is a pneumatic actuator, an electric actuator or a manual actuator.

[0018] Preferably, the heat-insulating shell is a cylindrical structure, and the heat-insulating shell is sleeved on the outside of the heat pipe shell and the cold pipe shell that are closely connected.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The present invention adopts a scheme in which a cold pipe shell and a heat pipe shell are arranged side by side. The cross-sections of the cold pipe shell and the heat pipe shell are semicircles of the same diameter. The two are combined into one to form a structure with a cross-section of a whole circle. The cold pipe shell and the heat pipe shell form a complete cylinder, which reduces the space occupied by the pipeline. The valves of the cold pipe shell and the heat pipe shell are both arranged on the outside, and the valves can be closed or opened without disassembling the pipeline. A complete insulation shell is sleeved on the outer cylindrical surface formed by the cold pipe shell and the heat pipe shell being connected, so that the cold pipe shell and the heat pipe shell can be insulated synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the helium circulation loop airflow isolation device of the present invention;

[0023] Figure 2 It is a schematic diagram of the connection between the helium circulation loop airflow isolation device of the present invention and the nuclear reactor and the steam generator;

[0024] Figure 3 It is a cross-sectional schematic diagram of the cold pipe assembly of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the connecting flange and the transition section of the present invention;

[0026] Figure 5 for Figure 4 Schematic diagram from another angle;

[0027] Figure 6 for Figure 4 A second angle diagram of

[0028] Figure 7 for Figure 3 An enlarged schematic diagram of point A.

[0029] In the figure: 1-heating device, 2-steam generator, 3-heat pipe assembly, 301-heat pipe shell, 302-heat pipe valve, 4-cold pipe assembly, 401-cold pipe shell, 4011-first steel plate, 4012-second steel plate, 402-cold pipe valve, 5-insulation shell, 6-connecting flange, 7-adapter. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The object of the present invention is to provide a helium circulation loop airflow isolation device to solve the problems existing in the above-mentioned prior art, and to open or close the cold pipe valve and the hot pipe valve without disassembling the cold pipe.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the present invention provides a helium circulation loop airflow isolation device, comprising a cold pipe assembly 4, a heat pipe assembly 3 and an insulation shell 5, the cold pipe assembly 4 comprises a cold pipe shell 401 with a semicircular cross section, and a cold pipe valve 402 is connected to the cold pipe shell 401 through an adapter 7; the heat pipe assembly 3 comprises a heat pipe shell 301 with a semicircular cross section, and a heat pipe valve 302 is connected to the heat pipe shell 301 through an adapter 7; the plane side of the heat pipe shell 301 can be fitted and connected with the corresponding plane side of the cold pipe shell 401; the insulation shell 5 is a cylindrical structure, and the insulation shell 5 is sleeved on the outside of the heat pipe shell 301 and the cold pipe shell 401 that are fitted and connected.

[0034] In this embodiment, the plane side of the heat pipe shell 301 and the plane side of the cold pipe shell 401 are respectively provided with extended flanges, and threaded holes are opened on the extended flanges. When the heat pipe shell 301 and the cold pipe shell 401 are fitted and connected, the threaded holes of the cold pipe shell 401 are fixedly connected with the threaded holes corresponding to the heat pipe shell 301 by bolts. Since the cold pipe shell 401 and the plane sides of the heat pipe shell 301 are closely attached together, the heat of the high-temperature helium in the heat pipe shell 301 is transferred to the low-temperature helium in the cold pipe shell 401 through the plane side, preventing the heat loss in the heat pipe shell 301; the outer circle of the cold pipe shell 401 and the heat pipe shell 301 is wrapped with an insulation shell 5 made of insulation material, which reduces the heat loss of helium in the closed circulation loop of helium.

[0035] In a specific embodiment, one end of the heat pipe shell 301 is connected to the helium outlet of the heating device 1, which can be a nuclear reactor, and the other end is connected to the helium inlet of the steam generator 2. One end of the cold pipe shell 401 is connected to the helium inlet of the nuclear reactor, and the other end is connected to the helium outlet of the steam generator 2. Both ends of the heat pipe valve 302 are arranged in the middle of the heat pipe shell 301 through the adapter 7, and both ends of the cold pipe valve 402 are arranged in the middle of the cold pipe shell 401 through the adapter 7. The heat pipe valves 302 and the cold pipe valves 402 are staggered to avoid interference with each other. During operation, the 750°C high-temperature gas generated by the nuclear reactor flows into the steam generator 2 through the heat pipe shell 301 to heat the liquid water. The water generates 571°C high-temperature, high-pressure superheated steam to drive the steam turbine to generate electricity. After the heat exchange, the temperature of the hot helium is reduced to 250°C, and then it is sent back to the core of the nuclear reactor through the main helium fan of the steam generator 2 through the cold pipe shell 401. The cold pipe shell 401 and the heat pipe shell 301 together constitute a helium circulation loop. When maintenance is required, the cold pipe valve 402 of the cold pipe shell 401 and the heat pipe valve 302 of the heat pipe shell 301 can be closed at any time, so that the helium circulation loop between the nuclear reactor and the steam generator 2 can achieve airflow isolation. The steam generator 2, the main helium fan, the steam turbine and the nuclear reactor are all mature and known structures, so they are not described in detail.

[0036] In order to facilitate the control of the opening and closing of the valve, a valve driving actuator is provided on the hot pipe valve 302 and the cold pipe valve 402. The valve driving actuator is at least one of a pneumatic actuator, an electric actuator or a manual actuator, so that the opening or closing of the valve can be pneumatic or electric. In the event of pneumatic or electric failure, the valve can be controlled by a handwheel provided with the valve.

[0037] In a preferred embodiment, the cold pipe housing 401 includes a first steel plate 4011 with a semicircular cross section and a second steel plate 4012 with a rectangular structure, and the arc-shaped opening side of the first steel plate 4011 is fixedly sealed and connected to the second steel plate 4012; the heat pipe housing 301 and the cold pipe housing 401 have the same structure. One end of the adapter 7 is fixedly connected to the cold pipe housing 401 or the heat pipe housing 301, and the other end is welded and fixed to the connecting flange 6, and the connecting flange 6 is fixedly connected to the flange edge of the cold pipe valve 402 or the heat pipe valve 302. The adapter 7 of this embodiment is a special-shaped cylindrical structure, and the cross-section of the connection end with the connecting flange 6 is a circular structure, and the cross-section of the connection end with the cold pipe shell 401 or the heat pipe shell 301 is a semicircular structure. The adapter 7 transitions axially from a circular interface structure close to one end of the connecting flange 6 to a semicircular interface structure close to one end of the cold pipe shell 401 or the heat pipe shell 301, so that one end of the adapter 7 is adapted to the connecting flange 6, and the other end is adapted to the cold pipe shell 401 or the heat pipe shell 301 structure.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A helium circulation loop airflow isolation device, characterized in that: include: A cold pipe assembly, the cold pipe assembly comprising a cold pipe shell with a semicircular cross section, the cold pipe shell being connected to a cold pipe valve via an adapter; A heat pipe assembly, the heat pipe assembly comprising a heat pipe shell with a semicircular cross section, the heat pipe shell being connected to a heat pipe valve via an adapter; the plane side of the heat pipe shell being able to be fitted and connected with the plane side of the corresponding cold pipe shell; The heat-insulating shell is arranged outside the heat pipe shell and the cold pipe shell.

2. The helium circulation loop airflow isolation device according to claim 1, characterized in that: The cold pipe shell comprises a first steel plate with a semicircular cross section and a second steel plate with a rectangular structure, and the arc-shaped opening side of the first steel plate is fixedly and sealedly connected to the second steel plate; the heat pipe shell and the cold pipe shell have the same structure.

3. The helium circulation loop airflow isolation device according to claim 1, characterized in that: One end of the adapter is fixedly connected to the cold pipe shell or the heat pipe shell, and the other end is connected to the cold pipe valve or the heat pipe valve through a connecting flange.

4. The helium circulation loop airflow isolation device according to claim 3, characterized in that: The adapter is a special-shaped cylindrical structure, the cross section of the end connected to the connecting flange is a circular structure, and the cross section of the end connected to the cold pipe shell or the heat pipe shell is a semicircular structure.

5. The helium circulation loop airflow isolation device according to claim 1, characterized in that: The adapter transitions axially from a circular interface structure close to one end of the connecting flange to a semicircular interface structure close to one end of the cold pipe shell or the heat pipe shell.

6. The helium circulation loop airflow isolation device according to claim 1, characterized in that: The plane side of the heat pipe shell and the plane side of the cold pipe shell are respectively provided with extended flanges, and threaded holes are opened on the extended flanges. When the heat pipe shell and the cold pipe shell are fitted and connected, the threaded holes of the cold pipe shell are fixedly connected with the corresponding threaded holes of the heat pipe shell by bolts.

7. The helium circulation loop airflow isolation device according to claim 1, characterized in that: One end of the heat pipe shell is connected to the helium outlet of the heating device, and the other end is connected to the helium inlet of the steam generator; one end of the cold pipe shell is connected to the helium inlet of the nuclear reactor, and the other end is connected to the helium outlet of the steam generator; both ends of the heat pipe valve are arranged in the middle of the heat pipe shell through an adapter, and both ends of the cold pipe valve are arranged in the middle of the cold pipe shell through an adapter.

8. The helium circulation loop airflow isolation device according to claim 7, characterized in that: The hot pipe valves and the cold pipe valves are arranged alternately.

9. The helium circulation loop airflow isolation device according to claim 1, characterized in that: The hot pipe valve and the cold pipe valve are both provided with a valve driving actuator, and the valve driving actuator is a pneumatic actuator, an electric actuator or a manual actuator.

10. The helium circulation loop airflow isolation device according to claim 1, characterized in that: The heat-insulating shell is a cylindrical structure, and is sleeved on the outside of the heat pipe shell and the cold pipe shell that are closely connected.

Images