Time-sharing sampling uranium hexafluoride mixed gas sampling system

Abstract

The invention relates to the technical field of sampling, in particular to a time-sharing sampling uranium hexafluoride mixed gas sampling system. The system comprises a first sampling device and a second sampling device which are respectively connected with a sampling pipeline through an electromagnetic valve, a sampling outlet is connected with a first vacuum tank, the first vacuum tank is connected with a vacuum pump, and a solid particle sampling film is arranged between a sampling inlet and the sampling outlet; a sampling outlet of the second sampling device is connected with a second vacuum tank, the second vacuum tank is connected with a vacuum pump, and a perfluorohexane solution is arranged between a sampling inlet and the sampling outlet; a sampling outlet of the third sampling device is connected with a third vacuum tank, the third vacuum tank is connected with a vacuum pump, and hydrogen fluoride sampling powder is arranged between a sampling inlet and the sampling outlet; and the control unit is used for controlling the electromagnetic valves and the vacuum pump in the sampling process. According to the uranium hexafluoride mixed gas sampling system, different substances in uranium hexafluoride mixed gas can be sampled in a time-sharing and fixed-point manner.

Description

Technical Field

[0001] The present application relates to the technical field of uranium hexafluoride detection, and in particular to a time-sharing sampling uranium hexafluoride mixed gas sampling system. Background Art

[0002] Uranium hexafluoride (UF6) is a key compound in the production process of nuclear fuel cycle facilities, and its handling and safe management are of vital importance. At room temperature and pressure, UF6 is in the form of a white solid powder, but it can sublime into gas at 56.4°C. Due to its active chemical properties, strong oxidizing, toxic and easy to spread, the leakage of UF6 may cause serious harm to operators and the environment.

[0003] In order to study the properties of UF6 leakage, experimenters often conduct simulated leakage experiments of UF6. During the experiment, it is necessary to sample the components and particulate matter of the simulated leakage products. The sampling devices in the prior art can only continuously sample a certain type of substance, and cannot sample different substances at fixed points in time. The sampling results are not comprehensive enough. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the purpose of the present application is to provide a time-sharing sampling uranium hexafluoride mixed gas sampling system, which can sample different substances in the uranium hexafluoride mixed gas at fixed points in time.

[0005] To achieve the above-mentioned purpose, the present application provides a time-sharing sampling system for uranium hexafluoride mixed gas, comprising:

[0006] A first sampling device, wherein the sampling inlet is connected to the sampling pipeline, the sampling outlet is connected to the first vacuum tank, the first vacuum tank is connected to a vacuum pump, and a solid particle sampling membrane is provided between the sampling inlet and the sampling outlet of the first sampling device;

[0007] A second sampling device, wherein the sampling inlet is connected to the sampling pipeline, the sampling outlet is connected to the second vacuum tank, the second vacuum tank is connected to a vacuum pump, and a perfluorohexane solution is arranged between the sampling inlet and the sampling outlet of the second sampling device;

[0008] A third sampling device, wherein the sampling inlet is connected to the sampling pipeline, the sampling outlet is connected to a third vacuum tank, the third vacuum tank is connected to a vacuum pump, and hydrogen fluoride sampling powder is arranged between the sampling inlet and the sampling outlet of the third sampling device;

[0009] The control unit is used to control the solenoid valves and the vacuum pump during the sampling process, so as to use the first sampling device / the second sampling device / the third sampling device to perform sampling respectively at different sampling times.

[0010] Furthermore, the sampling inlet of the second sampling device is an S-shaped elbow, and the S-shaped elbow extends to the perfluorohexane solution inside the second sampling device.

[0011] Furthermore, the sampling inlets of the first sampling device, the second sampling device and the third sampling device are all connected to the sampling channel through a quick connector.

[0012] Furthermore, the hydrogen fluoride sampling powder is alumina monohydrate powder.

[0013] Furthermore, the hydrogen fluoride sampling powder is zeolite.

[0014] Furthermore, solenoid valves are provided between the first vacuum tank, the second vacuum tank and the third vacuum tank and the vacuum pump respectively.

[0015] Furthermore, the first vacuum tank, the second vacuum tank and the third vacuum tank have the same volume.

[0016] Furthermore, the total number of the first sampling device, the second sampling device and the third sampling device corresponds to the number of sampling times.

[0017] Furthermore, the solid particle sampling membrane is detachably arranged relative to the first sampling device.

[0018] The time-sharing sampling uranium hexafluoride mixed gas sampling system provided in the present application can detect different substances in the uranium hexafluoride mixed gas at a fixed point and at a time-sharing basis, and use different sampling devices to sample the uranium hexafluoride mixed gas in different time periods. The sampling process is more flexible and the sampling dimensions are more comprehensive.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the uranium hexafluoride mixed gas sampling system for time-sharing sampling of the present application;

[0022] Figure 2 This is a schematic diagram of the structure of the first sampling device of the present application;

[0023] Figure 3 This is a schematic diagram of the structure of the second sampling device of the present application;

[0024] Figure 4 This is a schematic structural diagram of the third sampling device of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0026] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0027] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0028] It should be noted that the modifications of "one" and "plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0029] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0030] Example 1

[0031] One embodiment of the present application provides a time-sharing sampling system for uranium hexafluoride mixed gas. Figure 1 This is a schematic diagram of the structure of the uranium hexafluoride mixed gas sampling system for time-sharing sampling of the present application, which will be referred to below Figure 1 The uranium hexafluoride mixed gas sampling system for time-sharing sampling of the present application is described in detail, including:

[0032] A first sampling device 200, wherein the sampling inlet is connected to the sampling pipeline 100, and the sampling outlet is connected to the first vacuum tank 500, wherein the first vacuum tank 500 is connected to a vacuum pump 800, and a solid particle sampling membrane is provided in the first sampling device 200;

[0033] A second sampling device 300, wherein the sampling inlet is connected to the sampling pipeline 100, and the sampling outlet is connected to a second vacuum tank 600, wherein the second vacuum tank 600 is connected to a vacuum pump 800, and a perfluorohexane solution is provided in the second sampling device 300;

[0034] The third sampling device 400 has a sampling inlet connected to the sampling pipeline 100 and a sampling outlet connected to a third vacuum tank 700. The third vacuum tank 700 is connected to a vacuum pump 800. The third sampling device is provided with hydrogen fluoride sampling powder.

[0035] A control unit is used to control the solenoid valves and vacuum pumps during the sampling process, so as to use the first sampling device / the second sampling device / the third sampling device for sampling at different times. The control process is as follows: when the first sampling device / the second sampling device / the third sampling device needs to be used, the solenoid valve connected thereto is opened, and then the vacuum pump is turned on for exhaust, until the pressure of the corresponding vacuum tank drops to the set value (generally atmospheric pressure), the sampling is completed, and the solenoid valve and the vacuum pump are closed.

[0036] In this embodiment, the first sampling device 200 is made of acrylic material, and the solid particle sampling membrane is detachably arranged in the first sampling device 200. The solid particle sampling membrane will retain the aerosol particles in the mixed gas by uranium hexafluoride on the solid particle sampling membrane. The uranium concentration can be calculated according to the sampling volume and the mass of the solid particle sampling membrane before and after sampling.

[0037] In this embodiment, in order to prevent solid particles in the uranium hexafluoride mixed gas from entering the perfluorohexane when the second sampling device 300 is used for sampling, the sampling inlet of the second sampling device 300 is an S-shaped elbow, and the S-shaped elbow extends to the perfluorohexane solution inside the second sampling device 300.

[0038] It is understandable that when the second sampling device 300 is used for sampling, the uranium hexafluoride in the mixed gas will dissolve into the perfluorohexane (C6F14) solution, while the hydrogen fluoride in the mixed gas is difficult to dissolve in the perfluorohexane solution. The concentrations of uranium fluoride and uranyl fluoride in the mixed gas can be calculated by elemental analysis and sampling volume.

[0039] In this embodiment, the sampling inlets of the first sampling device 200 , the second sampling device 300 and the third sampling device 400 are all connected to the sampling channel 100 through quick connectors, and the quick connectors can ensure that the sampling pipeline 100 is sealed and connected to each sampling device.

[0040] In this embodiment, the hydrogen fluoride sampling powder is alumina monohydrate powder.

[0041] The sampling principle is as follows:

[0042] 3UF 6 +6Al 2 O 3 ﹒ H 2 O(solid) → 3UO 2 F 2 +4AlF 3 +4Al 2 O 3 +6H 2 O;

[0043] 6HF+3Al 2 O 3 ﹒ H 2 O(solid)→2AlF 3 +2Al 2 O 3 +6H 2 O.

[0044] In some other embodiments, the hydrogen fluoride sampling powder may also be zeolite.

[0045] In this embodiment, solenoid valves are disposed between the first sampling device 200 , the second sampling device 300 , and the third sampling device 400 and the sampling pipeline 100 .

[0046] In this embodiment, the volumes of the first vacuum tank, the second vacuum tank and the third vacuum tank are the same, so as to implement sampling by different sampling methods with a fixed volume.

[0047] Exemplarily, a working process of an embodiment of the present application is as follows:

[0048] Before sampling, the first sampling device 200, the second sampling device 300 and the third sampling device 400 are all filled with nitrogen. When the first sampling time comes, the sampling channel is connected to the first sampling device by opening the corresponding solenoid valve, and then the corresponding first vacuum tank and vacuum pump are used to evacuate the gas, so that the uranium hexafluoride mixed gas in the sampling channel enters the first vacuum tank after passing through the first sampling device. When the pressure of the fixed volume first vacuum tank drops to the set value (generally atmospheric pressure), the solenoid valve is closed; when the second sampling time comes, the sampling channel 100 is connected to the first sampling device by opening the corresponding solenoid valve. The second sampling device is connected, and then the corresponding second vacuum tank and vacuum pump are used to evacuate air, so that the uranium hexafluoride mixed gas in the sampling channel passes through the second sampling device and enters the second vacuum tank. When the pressure of the second vacuum tank with a fixed volume is reduced to a set value, the solenoid valve is closed; when the third sampling time comes, the sampling channel is connected to the third sampling device by opening the corresponding solenoid valve, and then the corresponding third vacuum tank and vacuum pump are used to evacuate air, so that the uranium hexafluoride mixed gas in the sampling channel passes through the third sampling device and enters the third vacuum tank. When the third sampling time ends, the solenoid valve is closed.

[0049] In this embodiment, one first sampling device 200, one second sampling device 300 and one third sampling device 400 are respectively provided to achieve time-sharing sampling in three sampling time periods.

[0050] In some other implementations, the first sampling device 200 , the second sampling device 300 , and the third sampling device 400 may also adaptively adjust the number of the sampling devices according to actual sampling time requirements.

[0051] In this embodiment, the first sampling device 200, the second sampling device 300 and the third sampling device 400 are connected to the same sampling channel 100 to achieve fixed-point time-sharing sampling.

[0052] In some other embodiments, the first sampling device 200, the second sampling device 300 and the third sampling device may also be connected to different sampling channels 100 respectively to achieve time-sharing and non-fixed-point sampling.

[0053] The above description is only a partial embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

[0054] In addition, although each operation is described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0055] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A time-sharing sampling system for uranium hexafluoride mixed gas, characterized in that: It includes: a first sampling device, wherein a sampling inlet is connected to the sampling pipeline, a sampling outlet is connected to a first vacuum tank, the first vacuum tank is connected to a vacuum pump, and a solid particle sampling membrane is provided between the sampling inlet and the sampling outlet of the first sampling device; A second sampling device, wherein a sampling inlet is connected to the sampling pipeline, a sampling outlet is connected to a second vacuum tank, the second vacuum tank is connected to a vacuum pump, and a perfluorohexane solution is provided between the sampling inlet and the sampling outlet of the second sampling device; A third sampling device, wherein the sampling inlet is connected to the sampling pipeline, the sampling outlet is connected to a third vacuum tank, the third vacuum tank is connected to a vacuum pump, and hydrogen fluoride sampling powder is arranged between the sampling inlet and the sampling outlet of the third sampling device; The control unit is used to control the solenoid valves and the vacuum pump during the sampling process, so as to use the first sampling device / the second sampling device / the third sampling device to perform sampling respectively at different sampling times.

2. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The sampling inlet of the second sampling device is an S-shaped elbow, and the S-shaped elbow extends to the perfluorohexane solution inside the second sampling device.

3. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The sampling inlets of the first sampling device, the second sampling device and the third sampling device are all connected to the sampling channel through a quick connector.

4. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The hydrogen fluoride sampling powder is alumina monohydrate powder.

5. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The hydrogen fluoride sampling powder is zeolite.

6. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: Solenoid valves are provided between the first vacuum tank, the second vacuum tank and the third vacuum tank and the vacuum pump respectively.

7. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The first vacuum tank, the second vacuum tank and the third vacuum tank have the same volume.

8. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1 is characterized in that: The total number of the first sampling device, the second sampling device and the third sampling device corresponds to the number of sampling times.

9. The time-sharing sampling uranium hexafluoride mixed gas sampling system according to claim 1, characterized in that: The solid particle sampling membrane is detachably arranged relative to the first sampling device.

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