A time-sharing sampling system for sampling uranium hexafluoride mixed gas

Abstract

The application 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, a second sampling device and a third sampling device which are connected with a sampling pipeline through electromagnetic valves respectively, the sampling outlet of the first sampling device is connected with a first vacuum tank, the first vacuum tank is connected with a vacuum pump, a solid particle sampling membrane is arranged between the sampling inlet and the sampling outlet, the sampling outlet of the second sampling device is connected with a second vacuum tank, the second vacuum tank is connected with a vacuum pump, perfluorohexane solution is arranged between the sampling inlet and the sampling outlet, the sampling outlet of the third sampling device is connected with a third vacuum tank, the third vacuum tank is connected with a vacuum pump, hydrogen fluoride sampling powder is arranged between the sampling inlet and the sampling outlet, and a control unit is used for controlling the electromagnetic valves and the vacuum pumps in the sampling process. The uranium hexafluoride mixed gas sampling system can sample different substances in the uranium hexafluoride mixed gas in a time-sharing and fixed-point mode.

Description

Technical Field

[0001] This application relates to the field of uranium hexafluoride detection technology, and in particular to a time-sampling uranium hexafluoride mixed gas sampling system. Background Technology

[0002] In the production process of nuclear fuel cycle facilities, uranium hexafluoride (UF6) is a critical compound, and its handling and safe management are of paramount importance. At room temperature and pressure, UF6 exists as a white solid powder, but it sublimates into a gas at 56.4°C. Due to its highly reactive chemical properties, including strong oxidizing power, toxicity, and easy dispersibility, a leak of UF6 can cause serious harm to operators and the environment.

[0003] To study the properties of UF6 during leakage, researchers often conduct simulated leakage experiments of UF6. During the experiment, it is necessary to sample the components and particulate matter generated by the simulated leakage. The sampling devices in the existing technology can only continuously and singly sample a certain type of substance, and cannot sample different substances at different times and locations, so the sampling results are not comprehensive enough. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide a time-sampling uranium hexafluoride mixed gas sampling system that can sample different substances in the uranium hexafluoride mixed gas at fixed points and at different times.

[0005] To achieve the above objectives, this application provides a time-sampling uranium hexafluoride mixed gas sampling system, comprising a sampling pipeline connected to a solenoid valve respectively:

[0006] The first sampling device has a sampling inlet connected to a sampling pipe and a sampling outlet connected to a first vacuum tank. The first vacuum tank is connected to a vacuum pump. A solid particle sampling membrane is provided between the sampling inlet and the sampling outlet of the first sampling device.

[0007] The second sampling device has a sampling inlet connected to a sampling pipeline and a sampling outlet connected to a second vacuum tank. The second vacuum tank is connected to a vacuum pump. A perfluorohexane solution is placed between the sampling inlet and the sampling outlet of the second sampling device.

[0008] The third sampling device has a sampling inlet connected to a sampling pipeline and a sampling outlet connected to a third vacuum tank. The third vacuum tank is connected to a vacuum pump, and hydrogen fluoride sampling powder is placed 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 vacuum pumps during the sampling process, so that the first sampling device / second sampling device / third sampling device are used for sampling at different sampling times.

[0010] Furthermore, the sampling inlet of the second sampling device is an S-shaped bend that extends into 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 via quick connectors.

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

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

[0014] Furthermore, each of the first, second, and third vacuum tanks is equipped with a solenoid valve between itself and the vacuum pump.

[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 mounted relative to the first sampling device.

[0018] The time-sampling uranium hexafluoride mixed gas sampling system provided in this application can detect different substances in uranium hexafluoride mixed gas at fixed points and at different times. Different sampling devices are used to sample uranium hexafluoride mixed gas at different time periods, making the sampling process more flexible and the sampling dimensions more comprehensive.

[0019] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present application and form part of the specification. Together with the embodiments of the present application, they serve to explain the present application but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the time-division sampling system for uranium hexafluoride mixed gas in this application.

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

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

[0024] Figure 4 This is a schematic diagram of the third sampling device of this application. Detailed Implementation

[0025] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

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

[0027] The term "comprising" and its variations as used herein are open-ended inclusion, meaning "including but not limited to". The term "based on" means "at least partially based 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". Definitions of other terms will be given in the description below.

[0028] It should be noted that the terms "one" and "multiple" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Multiple" should be understood as two or more.

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] Example 1

[0031] One embodiment of this application provides a time-division sampling system for a uranium hexafluoride mixed gas mixture. Figure 1 This is a schematic diagram of the time-division sampling system for uranium hexafluoride mixed gas of this application. The following will refer to... Figure 1 The present application provides a detailed description of the time-sampling uranium hexafluoride mixed gas sampling system, including:

[0032] The first sampling device 200 has a sampling inlet connected to the sampling pipe 100 and a sampling outlet connected to the first vacuum tank 500. The first vacuum tank 500 is connected to a vacuum pump 800. A solid particle sampling membrane is provided in the first sampling device 200.

[0033] The second sampling device 300 has a sampling inlet connected to the sampling pipe 100 and a sampling outlet connected to the second vacuum tank 600. The second vacuum tank 600 is connected to a vacuum pump 800. The second sampling device 300 contains a perfluorohexane solution.

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

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

[0036] In this embodiment, the first sampling device 200 is made of acrylic material, and the solid particle sampling membrane is detachably installed in the first sampling device 200. The solid particle sampling membrane will retain aerosol particles in the mixed gas of uranium hexafluoride on the solid particle sampling membrane. The uranium concentration can be calculated based on 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 sampling using the second sampling device 300, the sampling inlet of the second sampling device 300 is an S-shaped bend that extends into the perfluorohexane solution inside the second sampling device 300.

[0038] It is understandable that when sampling is performed using the second sampling device 300, uranium hexafluoride in the mixed gas will dissolve in perfluorohexane (C6F14) solution, while hydrogen fluoride in the mixed gas is difficult to dissolve in 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. The quick connectors can ensure that the sampling channel 100 is sealed to each sampling device.

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

[0041] The sampling principle is as follows:

[0042] 3UF6 + 6Al2O3·H2O (solid) → 3UO2F2 + 4AlF3 + 4Al2O3 + 6H2O;

[0043] 6HF + 3Al₂O₃·H₂O (solid) → 2AlF₃ + 2Al₂O₃ + 6H₂O.

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

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

[0046] In this embodiment, the first vacuum tank, the second vacuum tank, and the third vacuum tank have the same volume to achieve sampling using different sampling methods with a fixed capacity.

[0047] For example, one working process of an embodiment of this 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 arrives, the corresponding solenoid valve is opened to connect the sampling channel with the first sampling device. 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 passes through the first sampling device and enters the first vacuum tank. 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 arrives, the corresponding solenoid valve is opened again to connect the sampling channel 100 with the first sampling device. The second sampling device is connected, and then the corresponding second vacuum tank and vacuum pump are used to evacuate the gas, so that the uranium hexafluoride mixed gas in the sampling channel enters the second vacuum tank after passing through the second sampling device. When the pressure of the fixed-volume second vacuum tank drops to the set value, the solenoid valve is closed. When the third sampling time arrives, the corresponding solenoid valve is opened to connect the sampling channel with the third sampling device, and then the corresponding third vacuum tank and vacuum pump are used to evacuate the gas, so that the uranium hexafluoride mixed gas in the sampling channel enters the third vacuum tank after passing through the third sampling device. 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-division sampling in three sampling time segments.

[0050] In other embodiments, the number of sampling devices 200, 300 and 400 can be adaptively adjusted according to the 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-division sampling.

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

[0053] The above description is merely a partial embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0054] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0055] Although the subject matter has been described using language specific to structural features and / or methodological logic, 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. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A time-division sampling system for a uranium hexafluoride mixed gas, characterized in that, This includes connections to the sampling pipeline via a solenoid valve: A first sampling device has a sampling inlet connected to the sampling pipe and a sampling outlet connected to a first vacuum tank. The first vacuum tank is connected to a vacuum pump. A solid particle sampling membrane is provided between the sampling inlet and the sampling outlet of the first sampling device. The second sampling device has a sampling inlet connected to the sampling pipeline and a sampling outlet connected to the second vacuum tank. The second vacuum tank is connected to a vacuum pump. A perfluorohexane solution is placed between the sampling inlet and the sampling outlet of the second sampling device. The third sampling device has a sampling inlet connected to the sampling pipeline and a sampling outlet connected to the third vacuum tank. The third vacuum tank is connected to a vacuum pump, and hydrogen fluoride sampling powder is placed between the sampling inlet and the sampling outlet of the third sampling device. The control unit is used to control the solenoid valves and vacuum pumps during the sampling process, so that the first sampling device / second sampling device / third sampling device are used for sampling at different sampling times.

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

3. The time-division sampling system for uranium hexafluoride mixed gas according to claim 1, characterized in that, The sampling inlets of the first, second, and third sampling devices are all connected to the sampling pipeline via quick connectors.

4. The time-division sampling system for uranium hexafluoride mixed gas according to claim 1, characterized in that, The hydrogen fluoride sampling powder is hydrated alumina powder.

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

6. The time-division sampling system for uranium hexafluoride mixed gas according to claim 1, characterized in that, The first vacuum tank, the second vacuum tank, and the third vacuum tank are each connected to a vacuum pump via a solenoid valve.

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

8. The time-division sampling system for uranium hexafluoride mixed gas according to claim 1, 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-division sampling system for uranium hexafluoride mixed gas according to claim 1, characterized in that, The solid particle sampling membrane is detachable from the first sampling device.

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