Two-stage recovery uranium hexafluoride recovery system

Abstract

The invention relates to the technical field of uranium hexafluoride recovery, in particular to a two-stage recovery uranium hexafluoride recovery system. The uranium hexafluoride recovery system comprises a carbon reactor, an inlet of which is connected with a feeding pipeline through an electromagnetic valve and an outlet of which is connected with a condensing device; the condensing device comprises a first outlet, a second outlet and at least one condenser, and the condenser is used for condensing uranium hexafluoride into a solid state or a liquid state; the first outlet is connected with a recovery pipeline, and the second outlet is connected with a tail gas treatment system; the recovery pipeline is provided with heating medium heat tracing and is used for heating the solid uranium hexafluoride in the recovery pipeline to be in a gas state or a liquid state; and the recovery container is arranged in the cooling container filled with the cooling medium and is used for cooling the uranium hexafluoride entering the recovery container into a solid state for storage. According to the uranium hexafluoride recovery system with the two-stage recovery function, uranium hexafluoride can be safely and efficiently recovered.

Description

Technical Field

[0001] The present application relates to the technical field of uranium hexafluoride recovery, and in particular to a two-stage recovery uranium hexafluoride recovery 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. After the experiment, a mixed gas including uranium hexafluoride and hydrogen fluoride will be produced. The existing technology mostly treats the mixed gas through a leaching tower and then filters it out. This method treats the mixed gas and avoids the harm caused by direct discharge of the mixed gas, but does not recover the uranium hexafluoride in the mixed gas, resulting in a waste of resources. 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 two-stage recovery uranium hexafluoride recovery system that can safely and efficiently recover UF6.

[0005] To achieve the above objectives, the present application provides a two-stage recovery uranium hexafluoride recovery system, comprising:

[0006] A carbon reactor, the inlet of which is connected to the feed pipeline via a solenoid valve, and the outlet of which is connected to the condensing device, wherein the carbon reactor is filled with uranium hexafluoride recovery reactants;

[0007] A condensation device, comprising a first outlet, a second outlet and at least one condenser, wherein the condenser is used to condense uranium hexafluoride into a solid or liquid state; the first outlet is connected to a recovery pipeline, the second outlet is connected to a tail gas treatment system, the first outlet is a uranium hexafluoride outlet, and the second outlet is a waste gas outlet;

[0008] The recovery pipeline is equipped with a heat medium to heat the solid uranium hexafluoride in the recovery pipeline to a gaseous or liquid state;

[0009] The recovery container is arranged in a cooling container filled with a cooling medium and is used to cool the uranium hexafluoride entering the recovery container into solid state storage.

[0010] Furthermore, the condensing device is connected to a condensing control system for monitoring the maximum temperature and pressure of the condensing device and adjusting the condensing temperature of the condensing device.

[0011] Furthermore, it also includes a heat medium control unit for monitoring the temperature and pressure of the recovery pipeline and adjusting the heating temperature of the heat medium heating.

[0012] Furthermore, there are two condensers in cascade.

[0013] Furthermore, the condensation temperature range of the condensation device is 20°C to 54°C.

[0014] Furthermore, the temperature range of the heat medium heating is 70°C to 90°C.

[0015] Furthermore, the cooling medium is liquid nitrogen.

[0016] Furthermore, the condensing device is a condensing device whose cooling medium is ethylene glycol aqueous solution and whose cooling method is jacket cooling.

[0017] Furthermore, the uranium hexafluoride chemical recovery reactant is sodium fluoride.

[0018] The two-stage recovery uranium hexafluoride recovery system provided in the present application realizes two-stage recovery of uranium hexafluoride through a carbon reactor and a condensation device, has a good recovery effect, and avoids waste of resources.

[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 structural diagram of the two-stage recovery uranium hexafluoride recovery system of the present application. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0027] Example 1

[0028] One embodiment of the present application provides a two-stage recovery system for uranium hexafluoride. Figure 1 This is a schematic diagram of the structure of the two-stage recovery uranium hexafluoride recovery system of the present application, which will be referred to below Figure 1 The two-stage recovery uranium hexafluoride recovery system of the present application is described in detail, including:

[0029] The carbon reactor 20 has an inlet connected to the feed pipe 10 via a solenoid valve 90 and an outlet connected to the first condensing device 30. The carbon reactor 20 is filled with uranium hexafluoride recovery reactants;

[0030] In this embodiment, the uranium hexafluoride recovery reactant is sodium fluoride.

[0031] The condensation device 30 comprises a first outlet, a second outlet and two cascaded condensers 31 and 32, wherein the condensers 31 and 32 are used to condense uranium hexafluoride into a solid or liquid state; the first outlet is connected to the recovery pipeline 50, and the second outlet is connected to the tail gas treatment system 300, the first outlet is a uranium hexafluoride outlet, and the second outlet is a waste gas outlet.

[0032] In this embodiment, two condensers 31 and 32 are configured in the condensing device 30 to improve the efficiency of condensation recovery.

[0033] In other embodiments, only one condenser or multiple condensers may be provided.

[0034] In this embodiment, the condensing device is a condensing device in which the cooling medium is ethylene glycol aqueous solution and the cooling method is jacket cooling.

[0035] It is understandable that the condensing device mainly includes evaporators, compressors, ethylene glycol recovery devices and other equipment in addition to the condenser. Among them, the evaporator allows ethylene glycol to contact with an external heat source (i.e., uranium hexafluoride mixed gas), absorbs heat and evaporates into gas, thereby achieving a refrigeration effect. The compressor is the power source in the ethylene glycol refrigerator, and its function is to compress the ethylene glycol gas in the evaporator into a high-temperature and high-pressure gas to increase its temperature and pressure. The function of the ethylene glycol recovery device is to recover the ethylene glycol in the condenser to ensure the recycling of ethylene glycol.

[0036] In this embodiment, the condensing device 30 is connected to a condensing control system 70 for monitoring the temperature and pressure of the condensing device and adjusting the condensing temperature of the condensing device.

[0037] In this embodiment, the condensation temperature range of the condensation device 30 is controlled to be 20° C. to 54° C., so that the hydrogen fluoride in the uranium hexafluoride mixed gas remains in a gaseous state and the uranium hexafluoride is in a liquid or solid state.

[0038] It should be noted that the exhaust gas treatment system 300 generally includes: a leaching tower, which is used to react with the exhaust gas entering the leaching tower from the bottom of the leaching tower by spraying sodium carbonate solution; a circulation tank, which is used to circulate and replenish the leaching solution; a heater, which is used to heat and dehumidify the leached exhaust gas; and a filter, which is used to filter and discharge the heated and dehumidified exhaust gas after testing and passing the test.

[0039] The recovery pipeline 50 is provided with a heat medium for heating the solid uranium hexafluoride in the recovery pipeline 50 to a gaseous or liquid state;

[0040] In this embodiment, the heat medium tracing is controlled by a heat medium control unit 80, and the heat medium control unit is used to monitor the temperature and pressure of the recovery pipeline and adjust the tracing temperature of the heat medium tracing.

[0041] In this embodiment, the temperature of the heat medium heating is controlled to be 70°C to 90°C.

[0042] The recovery container 60 is disposed in a cooling container 200 filled with a cooling medium, and is used to cool the uranium hexafluoride entering the recovery container 60 into solid state storage.

[0043] In this embodiment, the cooling medium in the cooling container 200 is liquid nitrogen.

[0044] In this embodiment, an electric valve 100 is further provided on the recovery pipe 50 .

[0045] A working process of an embodiment of the present application is as follows:

[0046] The condensation and electric heating are turned on through the condensation control system 70 and the heat medium control unit 80, and the condensation temperature and the electric heating temperature are adjusted; the inlet and outlet valves of the carbon reactor 20 and the condensation device 30 are opened to start recovery; after the collection is completed, the outlet valves of the carbon reactor 20 and the condensation device 30 are closed in turn.

[0047] 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.

[0048] 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.

[0049] 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 two-stage recovery system for uranium hexafluoride, characterized in that: include: A carbon reactor, the inlet of which is connected to the feed pipeline via a solenoid valve, and the outlet of which is connected to the condensing device, wherein the carbon reactor is filled with uranium hexafluoride recovery reactants; A condensation device, comprising a first outlet, a second outlet and at least one condenser, wherein the condenser is used to condense uranium hexafluoride into a solid or liquid state; the first outlet is connected to a recovery pipeline, the second outlet is connected to a tail gas treatment system, the first outlet is a uranium hexafluoride outlet, and the second outlet is a waste gas outlet; The recovery pipeline is equipped with a heat medium to heat the solid uranium hexafluoride in the recovery pipeline to a gaseous or liquid state; The recovery container is arranged in a cooling container filled with a cooling medium and is used to cool the uranium hexafluoride entering the recovery container into solid state storage.

2. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The condensing device is connected to a condensing control system for monitoring the maximum temperature and pressure of the condensing device and adjusting the condensing temperature of the condensing device.

3. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: It also includes a heat medium control unit, which is used to monitor the temperature and pressure of the recovery pipeline and adjust the heating temperature of the heat medium.

4. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: Also includes: There are two condensers in cascade.

5. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The condensation temperature range of the condensation device is 20°C to 54°C.

6. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The temperature range of the heat medium heating is 70°C to 90°C.

7. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The cooling medium is liquid nitrogen.

8. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The condensation device is a condensation device in which the cooling medium is ethylene glycol aqueous solution and the cooling method is jacket cooling.

9. The two-stage recovery uranium hexafluoride recovery system according to claim 1, characterized in that: The uranium hexafluoride chemical recovery reactant is sodium fluoride.

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