Thermal environment identification system for nuclear power equipment

Abstract

The utility model discloses a thermal environment identification system for nuclear power equipment. Comprising an identification test chamber, a heating device for heating the interior of the identification test chamber to a test temperature, a steam generating device for providing steam and / or saturated steam for the identification test chamber, a high-pressure air generating device for providing high-pressure air for the identification test chamber, and a spraying device for spraying a spraying liquid into the identification test chamber, the heating device is installed on the identification test chamber, the steam generation device and the high-pressure air generation device are respectively connected with the identification test chamber, and a spray head of the spray device is installed at the top in the identification test chamber. According to the nuclear power equipment thermal environment identification system, an accelerated thermal aging test, an accident high-temperature and high-pressure environment test and a spray test can be simultaneously carried out, the nuclear power equipment identification period is shortened, and the complexity and the cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power equipment testing, in particular to a nuclear power equipment thermal environment identification system. Background Art

[0002] In nuclear power plants, a large number of high-energy pipelines are arranged according to various system requirements, such as primary circuit pipelines, secondary circuit main steam pipelines, main feed water pipelines, etc. When a high-energy pipeline ruptures, high-temperature, high-pressure fluids are released from the rupture, and the strong mass-energy release causes the temperature and pressure of the plant environment around the rupture to rise rapidly. If equipment that needs to perform safety functions in an accident is arranged in the plant, the equipment needs to perform safety functions in a high-temperature, high-pressure environment. Such equipment needs to be identified in a high-temperature, high-pressure thermal environment to verify that the performance of the equipment meets the requirements.

[0003] At the same time, some buildings in nuclear power plants (such as reactor buildings) are also designed with a system for spraying after an accident. The relevant equipment also needs to be identified for spraying, and the chemical properties of the spraying liquid (such as pH value) should be considered. In addition, some equipment (especially electrical and instrumentation equipment) has a significant aging mechanism, and thermal aging identification is also required.

[0004] In combination with the above requirements, a typical nuclear power equipment thermal environment assessment process includes accelerated thermal aging test, accident high temperature and high pressure environment test, and spray test (spray test can also be performed during the accident environment test). There are currently two practices at home and abroad for the test of accident high temperature and high pressure environment: one is to conduct the test using dew point temperature (steam is in a saturated state during the test), and the other is to conduct the test using mixed temperature.

[0005] To perform the above tests, the current common practice in the industry is to use specific test devices, such as accelerated thermal aging test devices, accident identification test devices, and spray test devices, and different test devices are often required when performing dew point temperature accident environment tests and mixed temperature accident environment tests. The use of multiple test devices for testing prolongs the cycle of nuclear power equipment identification and increases complexity and cost. Therefore, it is necessary to design a nuclear power equipment thermal environment identification system that can perform the above three identification tests at the same time and is compatible with dew point temperature accident environment tests and mixed temperature accident environment tests. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a nuclear power equipment thermal environment identification system capable of carrying out accelerated thermal aging tests, accident high temperature and high pressure environment tests and spray tests.

[0007] The utility model solves the technical problem by adopting a technical solution: providing a nuclear power equipment thermal environment identification system, comprising a closed identification test cabin, a heating device for heating the identification test cabin to a test temperature, a steam generating device for providing steam and / or saturated steam to the identification test cabin, a high-pressure air generating device for providing high-pressure air to the identification test cabin to reach a test pressure in the cabin, and a spraying device for spraying a spray liquid into the identification test cabin;

[0008] The heating device is installed on the identification test cabin, the steam generating device and the high-pressure air generating device are respectively connected to the identification test cabin, and the spray head of the spray device is installed on the top of the identification test cabin.

[0009] Preferably, the steam generating device comprises a steam generator, a steam storage tank, a saturated steam tank, a first steam pipeline and a second steam pipeline;

[0010] The steam storage tank is connected to the steam generator to store the superheated steam generated by the steam generator; the first steam pipe and the second steam pipe are connected in parallel between the steam storage tank and the identification test chamber; the saturated steam tank is arranged on the second steam pipe to make the superheated steam become saturated steam and then enter the identification test chamber.

[0011] Preferably, the steam generating device further comprises a first steam isolation valve arranged on the first steam pipeline, a second steam isolation valve arranged on the second steam pipeline, and a saturated steam valve;

[0012] On the second steam pipeline, the second steam isolation valve is located between the saturated steam tank and the steam storage tank, and the saturated steam valve is located between the saturated steam tank and the identification test chamber.

[0013] Preferably, the high-pressure air generating device comprises an air compressor, a high-pressure air tank, a high-pressure air pipeline and an air valve for generating high-pressure air;

[0014] The high-pressure gas tank is connected to the air compressor and stores high-pressure air from the air compressor; the high-pressure air pipeline is connected between the high-pressure gas tank and the identification test cabin, and the air valve is arranged on the high-pressure air pipeline.

[0015] Preferably, the heating device comprises an electric heater.

[0016] Preferably, the spray device includes the spray head, and also includes a spray liquid tank, a spray pipeline and a spray valve;

[0017] The spray pipe is connected between the spray head and the spray liquid tank, and the spray valve is arranged on the spray pipe.

[0018] Preferably, the nuclear power equipment thermal environment identification system further comprises a pressure measuring device and a temperature measuring device which are arranged on the identification test chamber and are used to measure pressure and temperature respectively.

[0019] Preferably, the nuclear power equipment thermal environment identification system also includes a downflow pipeline connected to the identification test chamber.

[0020] Preferably, the discharge pipeline includes a discharge pipe connected to the bottom of the identification test chamber and a discharge valve arranged on the discharge pipe.

[0021] Preferably, the downstream pipeline also includes a downstream water pool; the downstream pipeline is connected between the identification test chamber and the downstream water pool.

[0022] The nuclear power equipment thermal environment evaluation system of the utility model can simultaneously carry out accelerated thermal aging test, accident high temperature and high pressure environment test and spray test, shortening the cycle of nuclear power equipment evaluation and reducing complexity and cost. When performing accident high temperature and high pressure environment test, it can be compatible with two test schemes: dew point temperature test and mixed temperature test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 The utility model is a schematic diagram of the connection structure of a nuclear power equipment thermal environment identification system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0026] like Figure 1 As shown, a nuclear power equipment thermal environment identification system according to an embodiment of the utility model may include an identification test chamber 10 , a heating device 20 , a steam generating device 30 , a high-pressure air generating device 40 and a spraying device 50 .

[0027] Among them, the heating device 20 is installed on the identification test cabin 10, and is used to heat the identification test cabin 10 to the test temperature, such as the accelerated thermal aging test temperature. The steam generating device 30 is connected to the identification test cabin 10, and is used to provide steam and / or saturated steam to the identification test cabin 10 to meet the high temperature and high pressure environment test environment of the accident. The high-pressure air generating device 40 is connected to the identification test cabin 10, and is used to provide high-pressure air to the identification test cabin 10 to meet the high pressure demand in the identification test cabin 10. The spraying device 50 is connected to the identification test cabin 10, and is used to spray the spray liquid into the identification test cabin 10 to meet the spraying test requirements, and can be used to simulate the impact of chemical spraying on the equipment after some accidents.

[0028] Specifically, the identification test chamber 10 is a closed chamber, the preparation of which and the environment inside the chamber can meet the following requirements: the maximum temperature rise rate inside the chamber is ≥150°C / s; the maximum test temperature inside the chamber reaches a mixed temperature of 230°C and a dew point temperature of 180°C; the maximum test pressure inside the chamber reaches 0.7MPa.abs.

[0029] The identification test chamber 10 can be provided with corresponding interfaces corresponding to the connection of each device.

[0030] The heating device 20 is preferably an electric heating device, and may further include at least one electric heater. The electric heater is installed on or inside the bulkhead of the identification test cabin 10, and heats the interior of the identification test cabin 10 by heating it with electricity, so that the temperature inside the cabin reaches the test temperature required for various tests.

[0031] The steam generating device 30 may further include a steam generator 31, a steam storage tank 32, a saturated steam tank 33, a first steam pipe 34 and a second steam pipe 35. The steam generator 31 is used to generate steam, and specifically, water can be converted into steam by heating. Generally, the steam generated is superheated steam. The steam storage tank 32 is connected to the steam generator 31 through a pipeline, and stores steam (i.e., superheated steam) from the steam generator 31. The first steam pipe 34 is connected between the steam storage tank 32 and the identification test cabin 10, and the steam in the steam storage tank 32 can be directly injected into the identification test cabin 10 through the first steam pipe 34; the first steam pipe 34 is provided with a first steam isolation valve 341, and the first steam isolation valve 341 is used to control the on-off of the first steam pipe 34.

[0032] The second steam pipeline 35 is connected between the steam storage tank 32 and the identification test chamber 10; the saturated steam tank 33 is arranged on the second steam pipeline 35. The saturated steam tank 33 is used to receive the superheated steam from the steam storage tank 32, prepare the superheated steam into saturated steam, and the saturated steam continues to flow along the second steam pipeline 35 into the identification test chamber 10, so as to be used for the dew point temperature identification test.

[0033] The second steam pipeline 35 is provided with a second steam isolation valve 351 and a saturated steam valve 352. The second steam isolation valve 351 is located between the saturated steam tank 33 and the steam storage tank 32 to control the on-off of the saturated steam tank 33 and the steam storage tank 32; the saturated steam valve 352 is located between the saturated steam tank 33 and the identification test cabin 10 to control the on-off of the saturated steam tank 33 and the identification test cabin 10.

[0034] Corresponding to the first steam pipe 34 and the second steam pipe 35, a first interface may be provided on the bulkhead of the identification test chamber 10 for connecting the first steam pipe 34, and a second interface may be provided on the bulkhead of the identification test chamber 10 for connecting the second steam pipe 35. The connection between the first interface and the first steam pipe 34 and the connection between the second interface and the second steam pipe 35 may also be detachably connected through joints.

[0035] The first steam pipe 34 and the second steam pipe 35 are connected in parallel between the steam storage tank 32 and the identification test chamber 10. In order to reduce the number of interfaces for connecting the steam pipes on the steam storage tank 32, the first steam pipe 34 and the second steam pipe 35 can be connected to a common pipe at one end facing the steam storage tank 32, and then connected to the steam storage tank 32 through the common pipe.

[0036] The high-pressure air generating device 40 may include an air compressor 41, a high-pressure gas tank 42, a high-pressure air pipeline 43 and an air valve 44. The air compressor 41 is used to generate high-pressure air, and the high-pressure gas tank 42 is connected to the air compressor 41 and is used to store the high-pressure air from the air compressor 41. The high-pressure air pipeline 43 is connected between the high-pressure gas tank 42 and the identification test cabin 10, and is used to transport the high-pressure air into the identification test cabin 10. The air valve 44 is arranged on the high-pressure air pipeline 43, and is used to control the on-off of the high-pressure air pipeline 43.

[0037] The spray device 50 may further include a spray head 51, which is installed at the top of the identification test chamber 10 and is used to spray the spray liquid downward from the top of the identification test chamber 10. According to actual settings, the spray device 50 may also include a spray liquid tank 52, a spray pipe 53 and a spray valve 54; the spray liquid tank 52 is arranged outside the identification test chamber 10 and is used to store the spray liquid, and the spray pipe 53 is connected between the spray head 51 and the spray liquid tank 52; the spray valve 54 is arranged on the spray pipe 53 and is used to control the on and off of the spray pipe 53.

[0038] Furthermore, the nuclear power equipment thermal environment identification system of the present invention may also include a pressure measuring device 60 for measuring the pressure in the identification test chamber 10 and a temperature measuring device 70 for measuring the temperature in the identification test chamber 10 according to the requirements of each test.

[0039] Alternatively, the pressure measuring device 60 may include a pressure measuring instrument connected to the identification test chamber 10, and the temperature measuring device 70 may include a temperature measuring instrument connected to the identification test chamber 10. The pressure measuring device 60 and the temperature measuring device 70 may further be connected to the control terminal for communication, and the measured pressure and temperature may be transmitted to the control terminal in real time, which is beneficial to the monitoring of the control terminal.

[0040] According to needs, the nuclear power equipment thermal environment identification system of the utility model may also include a downflow pipeline 80 connected to the identification test layer, which is used to depressurize or empty the identification test chamber 10 during or after the test.

[0041] The discharge pipeline 80 may specifically include a discharge pipe 81 connected to the bottom of the identification test chamber 10 and a discharge valve 82 disposed on the discharge pipe 81; the discharge valve 82 is used to control the on-off of the discharge pipe 81. The discharge pipe 81 is further connected to a discharge pool 83, and the fluid in the identification test chamber 10 is discharged to the discharge pool 83 through the discharge pipe 81 for collection, so as to prevent the high-temperature and high-pressure steam from damaging the surrounding environment or equipment.

[0042] The following describes the application of the nuclear power equipment thermal environment identification system of the present invention in various tests.

[0043] 1. Accelerated thermal aging test

[0044] The first steam isolation valve 341, the second steam isolation valve 351, the saturated steam valve 352, the air valve 44, the drain valve 82, and the spray valve 54 are all closed, and the identification test chamber 10 is heated by an electric heater to reach the required temperature for the accelerated thermal aging test and the test is performed.

[0045] 2. Accidental high temperature and high pressure environment test

[0046] When the dew point temperature test is used: close the first steam isolation valve 341, generate superheated steam through the steam generator 31, and store it in the steam storage tank 32. When the steam in the steam storage tank 32 reaches a certain amount, open the second steam isolation valve 351 to introduce the steam into the saturated steam tank 33. The steam is prepared as saturated steam and stored in the saturated steam tank 33. During the test, a large amount of saturated steam is injected into the identification test chamber 10 by opening the saturated steam valve 352 to achieve a high temperature and high pressure test environment. During the test, the real-time temperature and pressure in the identification test chamber 10 are monitored, and the saturated steam valve 352 is opened again as needed to maintain the temperature and pressure in the identification test chamber 10.

[0047] When the mixed temperature test is adopted: close the second steam isolation valve 351 and the saturated steam valve 352, generate superheated steam through the steam generator 31, and store it in the steam storage tank 32. When the amount of steam in the steam storage tank 32 reaches the requirement, open the first steam isolation valve 341 to inject a large amount of high-temperature and high-pressure steam into the identification test cabin 10, and open the air valve 44 as appropriate to further pressurize the identification test cabin 10. During the test, by monitoring the real-time temperature and pressure in the identification test cabin 10, open the first steam isolation valve 341 and / or the air valve 44 again as needed to maintain the temperature and pressure in the identification test cabin 10. When it is necessary to increase the temperature of the identification test cabin 10 or to increase the temperature and pressure in the identification test cabin 10 at the same time, open the first steam isolation valve 341 first to inject high-temperature and high-pressure steam into the identification test cabin 10. When it is only necessary to increase the pressure of the identification test cabin 10, open the air valve 44 to inject high-pressure air into the identification test cabin 10.

[0048] During the above test process or after the test is completed, the pressure of the identification test chamber 10 is released or the temperature is reduced by opening the discharge valve 82 .

[0049] 3. Spray test

[0050] A spray liquid with corresponding chemical composition is prepared in advance in the spray liquid tank 52, and the test is performed by opening the spray valve 54 during or after the accident high temperature and high pressure environment test.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A nuclear power equipment thermal environment identification system, It is characterized in that It comprises an identification test cabin, a heating device for heating the identification test cabin to a test temperature, a steam generating device for providing steam and / or saturated steam to the identification test cabin, a high-pressure air generating device for providing high-pressure air to the identification test cabin, and a spraying device for spraying a spray liquid into the identification test cabin; The heating device is installed on the identification test cabin, the steam generating device and the high-pressure air generating device are respectively connected to the identification test cabin, and the spray head of the spray device is installed on the top of the identification test cabin.

2. The nuclear power equipment thermal environment identification system according to claim 1, It is characterized in that The steam generating device comprises a steam generator, a steam storage tank, a saturated steam tank, a first steam pipeline and a second steam pipeline; The steam storage tank is connected to the steam generator to store the superheated steam generated by the steam generator; the first steam pipe and the second steam pipe are connected in parallel between the steam storage tank and the identification test chamber; the saturated steam tank is arranged on the second steam pipe to make the superheated steam become saturated steam and then enter the identification test chamber.

3. The nuclear power equipment thermal environment identification system according to claim 2, It is characterized in that The steam generating device further comprises a first steam isolation valve arranged on the first steam pipeline, a second steam isolation valve and a saturated steam valve arranged on the second steam pipeline; On the second steam pipeline, the second steam isolation valve is located between the saturated steam tank and the steam storage tank, and the saturated steam valve is located between the saturated steam tank and the identification test chamber.

4. The nuclear power equipment thermal environment identification system according to claim 1, It is characterized in that The high-pressure air generating device comprises an air compressor, a high-pressure air tank, a high-pressure air pipeline and an air valve for generating high-pressure air; The high-pressure gas tank is connected to the air compressor and stores high-pressure air from the air compressor; the high-pressure air pipeline is connected between the high-pressure gas tank and the identification test cabin, and the air valve is arranged on the high-pressure air pipeline.

5. The nuclear power equipment thermal environment identification system according to claim 1, It is characterized in that The heating device comprises an electric heater.

6. The nuclear power equipment thermal environment identification system according to claim 1, It is characterized in that The spray device includes the spray head, a spray liquid tank, a spray pipe and a spray valve; The spray pipe is connected between the spray head and the spray liquid tank, and the spray valve is arranged on the spray pipe.

7. The nuclear power equipment thermal environment evaluation system according to any one of claims 1 to 6, It is characterized in that The nuclear power equipment thermal environment identification system also includes a pressure measuring device and a temperature measuring device which are arranged on the identification test cabin and are used to measure pressure and temperature respectively.

8. The nuclear power equipment thermal environment identification system according to any one of claims 1 to 6, It is characterized in that The nuclear power equipment thermal environment identification system also includes a downflow pipeline connected to the identification test chamber.

9. The nuclear power equipment thermal environment evaluation system according to claim 8, It is characterized in that The downflow pipeline includes a downflow pipe connected to the bottom of the identification test chamber and a downflow valve arranged on the downflow pipe.

10. The nuclear power equipment thermal environment evaluation system according to claim 9, It is characterized in that The discharge pipeline also includes a discharge water pool; the discharge pipeline is connected between the identification test chamber and the discharge water pool.

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