A uranium enrichment plant multi-parallel product container decontamination apparatus and method

Abstract

The present application belongs to the technical field of uranium enrichment process, and particularly relates to a kind of purification device and method of multiple parallel product container of uranium enrichment plant, the device includes: receiving unit, buffer container, purification container, HF adsorption tower, gas storage tank and vacuum pump, receiving unit, buffer container, purification container, HF adsorption tower, gas storage tank and vacuum pump are sequentially connected;Receiving unit includes at least four 30B containers, 30B container is installed in the cold air box, and purification container is installed in the refrigerator cabinet.The device and method of the present application can quickly and efficiently remove light impurity gas in 30B container, maintain the condensation production capacity of the receiving unit, and continuously receive materials.

Description

Technical Field

[0001] This invention belongs to the field of uranium enrichment process technology, specifically relating to a purification device and method for multi-parallel product containers in a uranium enrichment plant. Background Technology

[0002] In domestic uranium enrichment plants, cascaded commercial enriched uranium hexafluoride concentrate can be directly collected using Container 30B. However, due to the continuous operation of the cascaded centrifuges, light impurity gases (HF, air, etc.) are transferred to the concentrate end and eventually accumulate in Container 30B, reducing its condensation capacity and increasing the load on the pressurization equipment. To mitigate the impact of light impurities on continuous concentrate collection and maintain the condensation capacity of the container, Container 30B needs to be purified to reduce the accumulated light impurity content. Container 30B has only one valve and cannot be purified simultaneously with concentrate collection. When the inlet pressure of Container 30B, i.e., the outlet pressure of the pressurization equipment, reaches the specified limit, Container 30B must be withdrawn from concentrate collection, purified, and then returned to continue collection.

[0003] The current purification process is as follows: two 30B containers are used as a receiving unit for parallel material collection. When the 30B containers need purification, they are switched to 3m... 3 The auxiliary receiving container (C) receives materials, and the two exiting 30B containers are simultaneously purified. After purification, the original receiving state is restored. The 3m container is periodically cleaned. 3 C-type auxiliary receiving container is used for purification. This purification method requires a 3m... 3 The C-type auxiliary receiving container increases the number of receiving points, and the container is frequently turned over. The separation capacity is over 500tSWU / a. When two 30B containers are connected in parallel for receiving, the pressure inside the container increases rapidly, requiring frequent purification. Summary of the Invention

[0004] The purpose of this invention is to provide a purification device and method for multiple parallel product containers in a uranium enrichment plant. This device and method can quickly and efficiently remove light impurity gases from the 30B container, thereby maintaining the condensation production capacity of the receiving unit and enabling continuous material collection.

[0005] Technical solution to achieve the purpose of this invention:

[0006] A purification device for multiple parallel product containers in a uranium enrichment plant, the device comprising: a receiving unit, a buffer container, a purification container, an HF adsorption tower, a gas storage tank, and a vacuum pump, wherein the receiving unit, buffer container, purification container, HF adsorption tower, gas storage tank, and vacuum pump are connected in sequence; the receiving unit includes at least four 30B containers, the 30B containers are installed inside a cold air box, and the purification containers are installed inside a refrigeration cabinet.

[0007] The 30B container is equipped with a receiving solenoid valve at the inlet and a purification solenoid valve at the outlet. The 30B container is connected to the buffer container via the purification solenoid valve. The buffer container is connected to the purification container via an electric regulating valve. The purification container is connected to the HF adsorption tower via its own inlet valve.

[0008] A pressure gauge is installed at the inlet of the 30B container, which is located downstream of the receiving valve of the 30B container; a pressure gauge is installed at the inlet of the purification container; and a pressure gauge is installed on the gas storage tank.

[0009] An electronic scale for the HF adsorption tower is installed at the bottom of the HF adsorption tower.

[0010] The purification containers include a primary purification container and a secondary purification container. The primary purification container is installed inside the primary refrigeration cabinet, and an inlet pressure gauge is installed at the inlet of the primary purification container, located downstream of the electric regulating valve. The secondary purification container is installed inside the secondary refrigeration cabinet, and an inlet pressure gauge and an inlet valve are installed at the inlet of the secondary purification container, located downstream of the inlet pressure gauge. The primary purification container is connected to the secondary purification container via the inlet pressure gauge and the inlet valve, and the secondary purification container is connected to the HF adsorption tower via the inlet valve.

[0011] The receiving unit includes multiple sets of 30B containers connected in parallel, and each set of 30B containers includes multiple 30B containers.

[0012] The receiving unit includes a first group of 30B containers, a second group of 30B containers, and a third group of 30B containers connected in parallel, with each group of 30B containers including two 30B containers.

[0013] The first group of 30B containers is installed inside the first group of cold air boxes. The inlet of the first group of 30B containers is equipped with a receiving solenoid valve and an inlet pressure gauge. The outlet of the first group of 30B containers is equipped with a purification solenoid valve. The inlet and outlet of the first group of 30B containers are connected by a pipeline to form a first connecting pipeline. The first connecting pipeline and the inlet pressure gauge of the first group of 30B containers are located downstream of the receiving solenoid valve and upstream of the purification solenoid valve. The first group of 30B containers is connected to the buffer container through the purification solenoid valve.

[0014] The second set of 30B containers is installed inside the second set of cold air boxes. The inlet of the second set of 30B containers is equipped with a receiving solenoid valve and an inlet pressure gauge. The outlet of the second set of 30B containers is equipped with a purification solenoid valve. The inlet and outlet of the second set of 30B containers are connected to form a second connecting pipeline. The second connecting pipeline and the inlet pressure gauge of the second set of 30B containers are located downstream of the receiving solenoid valve and upstream of the purification solenoid valve. The second set of 30B containers is connected to the buffer container through the purification solenoid valve.

[0015] The third set of 30B containers is installed inside the third set of cold air boxes. The inlet of the third set of 30B containers is equipped with a receiving solenoid valve and an inlet pressure gauge. The outlet of the third set of 30B containers is equipped with a purification solenoid valve. The inlet and outlet of the third set of 30B containers are connected to form a third connecting pipeline. The third connecting pipeline and the inlet pressure gauge of the third set of 30B containers are located downstream of the receiving solenoid valve and upstream of the purification solenoid valve. The third set of 30B containers is connected to the buffer container through the purification solenoid valve.

[0016] A method for purifying containers of multiple parallel products in a uranium enrichment plant, the method comprising:

[0017] Step 1: Transfer the light impurity gas in the first set of 30B containers to the buffer container;

[0018] Step 2: Purify the light impurity gas transferred to the buffer container;

[0019] Step 3: Calculate the amount of HF collected in the HF adsorption tower and the air mass in the storage tank;

[0020] Step 4: Transfer the light impurity gas in the second set of 30B containers to the buffer container, and repeat steps 2 and 3.

[0021] Step 5: Transfer the light impurity gas in the third group 30B container to the buffer container. Repeat steps 2 and 3 until the light impurity gas in all groups of 30B containers is transferred to the buffer container. Repeat steps 2 and 3 to complete the purification.

[0022] Step 6: Summarize and calculate the total amount of light impurities removed from the air during this purification process;

[0023] Step 7: Summarize and calculate the total amount of light impurities purified in the air on that day, and enter the data into the system.

[0024] Step 1 includes:

[0025] Step 1.1: Close the receiving valve of the first group of 30B containers and remove the first group of 30B containers from the receiving area;

[0026] Step 1.2: Freeze the first set of 30B containers;

[0027] Step 1.3: Open the purification valve of the first group 30B container to connect the first group 30B container with the buffer container until the pressure of the first group 30B container and the buffer container reach equilibrium, then close the purification valve of the first group 30B container.

[0028] Step 1.4: Open the receiving valve of the first group of 30B containers to incorporate the first group of 30B containers into the receiving process.

[0029] Step 2 includes:

[0030] Step 2.1: Connect the buffer container, primary purification container, secondary purification container, HF adsorption tower, and gas storage tank;

[0031] Step 2.2: Adjust the set value of the electric regulating valve to control the pressure of the inlet pressure gauge of the primary purification container to not exceed 6 Torr, and collect the UF6 condensed into solid in the primary purification container;

[0032] Step 2.3: Adjust the opening of the valve at the inlet of the secondary purification container. The pressure of the pressure gauge at the inlet of the secondary purification container should not exceed 2 Torr. The secondary purification container collects UF6 condensed into solid form.

[0033] Step 2.4: Control the opening degree of the valve at the inlet of the HF adsorption tower itself, so that the HF adsorption tower adsorbs HF gas;

[0034] Step 2.5: Observe the pressure gauge of the gas storage tank. After the pressure rise in the gas storage tank stabilizes, the gas storage tank has finished collecting non-condensable gases. Start the vacuum pump, evacuate the gas storage tank, and then stop the vacuum pump. The purification is complete.

[0035] Step 3 includes:

[0036] Step 3.1: Calculate the amount of HF collected by measuring the weight change of the electronic scale of the HF adsorption tower;

[0037] Step 3.2: Calculate the air mass based on the ideal gas law PV=nRT and the pressure of the gas tank pressure gauge.

[0038] The beneficial technical effects of this invention are as follows:

[0039] 1. The present invention provides a purification device and method for multiple parallel product containers in a uranium enrichment plant, which simplifies the process flow and eliminates the need for a 3m... 3The C auxiliary receiving container, along with multiple 30B containers, sequentially exits the purification process during the receiving process, thus solving the problem of rapid pressure increase in the remaining receiving containers and high load on the pressurization equipment during the purification process of the 30B container.

[0040] 2. The present invention provides a purification device and method for multiple parallel product containers in a uranium enrichment plant, which can ensure the purification of 30B containers and 3m 3 The purification frequency of container C is equivalent to or less than 3 minutes. 3 C. Container purification frequency.

[0041] 3. The purification method for multi-parallel product containers in a uranium enrichment plant provided by the present invention adopts a method of first fully freezing and then purifying, which improves the purification effect of the 30B container and makes the purification of light impurities in the 30B container more thorough.

[0042] 4. The present invention provides a method for purifying multiple parallel product containers in a uranium enrichment plant. During purification, light impurities are first released into a buffer container, and then the buffer container is purified. This method shortens the purification time per cycle and improves the purification efficiency. Attached Figure Description

[0043] Figure 1 A purification process flow diagram of a purification device for a multi-parallel product container in a uranium enrichment plant provided by the present invention;

[0044] In the diagram: 1- First group 30B container receiving valve; 2- First group 30B container inlet pressure gauge; 3- First group 30B container; 4- First group cold air box; 5- First group 30B container purification valve; 6- Second group 30B container receiving valve; 7- Second group 30B container inlet pressure gauge; 8- Second group 30B container; 9- Second group cold air box; 10- Second group 30B container purification valve; 11- Third group 30B container receiving valve; 12- Third group 30B container inlet pressure gauge; 13- Third group 30B container; 14 - Third group of cold air boxes; 15-Third group 30B container purification electric valve; 16-Buffer container; 17-Electric regulating valve; 18-Inlet pressure gauge of primary purification container; 19-Primary purification container; 20-Primary refrigeration cabinet; 21-Inlet pressure gauge of secondary purification container; 22-Inlet valve of secondary purification container; 23-Secondary purification container; 24-Secondary refrigeration cabinet; 25-Inlet valve of HF adsorption tower; 26-HF adsorption tower; 27-Electronic scale of HF adsorption tower; 28-Gas storage tank; 29-Gas storage tank pressure gauge; 30-Vacuum pump. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0046] like Figure 1As shown, the present invention provides a multi-parallel product container purification device for a uranium enrichment plant, comprising: a receiving unit, a buffer container 16, a purification container, an HF adsorption tower 26, a gas storage tank 28, a vacuum pump 30, a cold air box, a refrigeration cabinet, and an electronic scale 27. The receiving unit, buffer container 16, purification container, HF adsorption tower 26, gas storage tank 28, and vacuum pump 30 are connected sequentially. The receiving unit includes multiple sets of 30B containers connected in parallel, and each set of 30B containers includes multiple 30B containers. Each set of 30B containers is installed inside the cold air box, and the purification container is installed inside the refrigeration cabinet. An electronic scale 27 for the HF adsorption tower is installed at the bottom of the HF adsorption tower 26.

[0047] Each 30B container is equipped with a 30B container receiving valve at the inlet and a 30B container purification valve at the outlet. The 30B container is connected to the buffer container 16 via the 30B container purification valve. The buffer container 16 is connected to the purification container via the electric regulating valve 17. The purification container is connected to the HF adsorption tower 26 via the HF adsorption tower inlet valve 25.

[0048] Each group of 30B containers is equipped with a 30B container inlet pressure gauge at the inlet, which is located downstream of the 30B container receiving solenoid valve; a purification container inlet pressure gauge is installed at the inlet of the purification container; and a gas storage tank pressure gauge 29 is installed on the gas storage tank 28.

[0049] The purification containers include a primary purification container 19 and a secondary purification container 23. The primary purification container 19 is installed inside the primary refrigeration cabinet 20. A primary purification container inlet pressure gauge 18 is installed at the inlet of the primary purification container 19, and the primary purification container inlet pressure gauge 18 is located downstream of the electric regulating valve 17. The secondary purification container 23 is installed inside the secondary refrigeration cabinet 24. A secondary purification container inlet pressure gauge 21 and a secondary purification container inlet valve 22 are installed at the inlet of the secondary purification container 23, and the secondary purification container inlet valve 22 is located downstream of the secondary purification container inlet pressure gauge 21. The primary purification container 19 is connected to the secondary purification container 23 via the secondary purification container inlet pressure gauge 21 and the secondary purification container inlet valve 22. The secondary purification container 23 is connected to the HF adsorption tower 26 via the HF adsorption tower inlet valve 25.

[0050] Taking a six-parallel product container with six 30B containers (two in a group) as an example, the receiving unit includes a first group of 30B containers 3, a second group of 30B containers 8 and a third group of 30B containers 13 connected in parallel. Each group of 30B containers includes two 30B containers.

[0051] The first set of 30B containers 3 is installed inside the first set of cold air boxes 4. The inlet of the first set of 30B containers 3 is equipped with the first set of 30B container receiving solenoid valve 1 and the first set of 30B container inlet pressure gauge 2. The outlet of the first set of 30B containers 3 is equipped with the first set of 30B container purification solenoid valve 5. The inlet and outlet of the first set of 30B containers 3 are connected to form the first connecting pipeline. The first connecting pipeline and the first set of 30B container inlet pressure gauge 2 are located downstream of the first set of 30B container receiving solenoid valve 1 and upstream of the first set of 30B container purification solenoid valve 5. The first set of 30B containers 3 is connected to the buffer container 16 through the first set of 30B container purification solenoid valve 5.

[0052] The second set of 30B containers 8 is installed inside the second set of cold air boxes 9. The inlet of the second set of 30B containers 8 is equipped with a second set of 30B container receiving solenoid valve 6 and a second set of 30B container inlet pressure gauge 7. The outlet of the second set of 30B containers 8 is equipped with a second set of 30B container purification solenoid valve 10. The inlet and outlet of the second set of 30B containers 8 are connected to form a second connecting pipeline. The second connecting pipeline and the second set of 30B container inlet pressure gauge 7 are located downstream of the second set of 30B container receiving solenoid valve 6 and upstream of the second set of 30B container purification solenoid valve 10. The second set of 30B containers 8 is connected to the buffer container 16 through the second set of 30B container purification solenoid valve 10.

[0053] The third set of 30B containers 13 is installed inside the third set of cold air boxes 14. The inlet of the third set of 30B containers 13 is equipped with a receiving solenoid valve 11 and an inlet pressure gauge 12. The outlet of the third set of 30B containers 13 is equipped with a purification solenoid valve 15. The inlet and outlet of the third set of 30B containers 13 are connected to form a third connecting pipeline. The third connecting pipeline and the inlet pressure gauge 12 are located downstream of the receiving solenoid valve 11 and upstream of the purification solenoid valve 15. The third set of 30B containers 13 is connected to the buffer container 16 via the purification solenoid valve 15.

[0054] The working principle of the purification device for multiple parallel product containers in a uranium enrichment plant provided by this invention is as follows:

[0055] Taking a six-parallel product container system consisting of six 30B containers (two in a group) as an example, the six 30B containers are respectively placed into three cold air boxes. The two 30B containers in each cold air box form a group, and the three groups, totaling six 30B containers, form a receiving unit to collect cascaded refined products in parallel. During the parallel collection of cascaded refined products by the six 30B containers, when the collection reaches the specified time or the inlet pressure reaches the specified value, the receiving valve of the first group of 30B containers is closed, and the first group of 30B containers is removed from the collection process. After being fully frozen, the light impurity gases (HF and air, etc.) accumulated in the container are transferred to the buffer container using pressure difference. After the pressure is balanced, the first group of 30B containers is rejoined for collection. The buffer container is then purified: a small amount of uranium hexafluoride gas and HF gas in the buffer container are collected by staged condensation, and non-condensable gases are discharged through a vacuum pump. After purification, the second set of 30B containers is removed from the receiving unit. After thorough freezing, the accumulated light impurity gases (HF and air, etc.) in the containers are transferred to the buffer container using pressure differential. Once the pressure is balanced, the second set of 30B containers is rejoined for receiving, and the buffer container is purified. After purification, the third set of 30B containers is removed from the receiving unit. After thorough freezing, the accumulated light impurity gases (HF and air, etc.) in the containers are transferred to the buffer container using pressure differential. Once the pressure is balanced, the third set of 30B containers is rejoined for receiving, and the buffer container is purified. After purification, this purification operation is complete. During the parallel receiving of six 30B containers, the above purification operation is performed according to the receiving time or pressure until the rated loading capacity of the 30B containers is reached, at which point they are removed from the receiving unit.

[0056] During purification, the mixed gas containing UF6 and light impurities enters the primary purification container, secondary purification container, HF adsorption tower, and storage tank sequentially from the buffer container. UF6 condenses in the two-stage purification containers, HF is collected in the HF adsorption tower, and non-condensable gases are temporarily stored in the storage tank and then discharged by vacuum pump.

[0057] Table 1 shows the 3m³ capacity at a scale of 1000tSWU / a. 3 The daily number of purification operations during the early, middle, and late stages of material receiving when using container C, two 30B containers, and four 30B containers in parallel, and under this operating condition, the number of purification operations per day during the early, middle, and late stages of material receiving. 3 The number of purification cycles for C-container receiving materials is comparable.

[0058] Table 1. Daily cleaning frequency of different receiving containers at a scale of 1000 tSWU / a

[0059]

[0060] The purification device for multiple parallel product containers in a uranium enrichment plant provided by this invention can also be used for purification of multiple parallel product containers such as four-parallel product containers, eight-parallel product containers, and nine-parallel product containers.

[0061] Taking six parallel product containers (two in a group) of six 30B containers as an example, the purification device for multiple parallel product containers in a uranium enrichment plant provided by this invention is used to perform periodic purification in sequence. The specific purification method is as follows:

[0062] Step 1: Transfer the light impurity gas in container 3 of the first group 30B to buffer container 16.

[0063] Step 1.1: Close the receiving valve 1 of the first group of 30B containers, and withdraw the first group of 30B containers 3 from receiving. The second group of 30B containers 8 and the third group of 30B containers 13 will continue to receive materials in parallel.

[0064] Step 1.2: Freeze the first group of 30B containers for 30 minutes to allow UF6 to fully solidify.

[0065] Step 1.3: Open the purification valve 5 of the first group 30B container to connect the first group 30B container 3 to the buffer container 16 which is under vacuum. Transfer the light impurity gas HF and air accumulated in the first group 30B container 3 to the buffer container 16 using the pressure difference. Monitor the pressure drop in the first group 30B container 3 through the pressure gauge 2 at the inlet of the first group 30B container until the pressure of the first group 30B container 3 and the buffer container 16 reach equilibrium, then close the purification valve 5 of the first group 30B container.

[0066] Step 1.4: Open the receiving valve 1 of the first group of 30B containers 3 and connect it to the receiving system.

[0067] Step 2: Purify the light impurity gas transferred to buffer container 16.

[0068] Step 2.1: Connect buffer container 16, primary purification container 19, secondary purification container 23, HF adsorption tower 26, and gas storage tank 28.

[0069] Step 2.2: Adjust the setting value of the electric regulating valve 17, and control the inlet pressure of the primary purification container 19 to not exceed 6 Torr through the inlet pressure gauge 18 of the primary purification container, so that the UF6 that overflows with light impurities during purification will condense into a solid in the primary purification container 19.

[0070] Step 2.3: Adjust the opening of the valve 22 at the inlet of the secondary purification container 23, and control the inlet pressure of the secondary purification container 23 to not exceed 2 Torr using the pressure gauge 21 at the inlet of the secondary purification container, so that the trace amount of UF6 condenses into a solid in the secondary purification container 23.

[0071] Step 2.4: Control the opening of the HF adsorption tower inlet valve 25 of the HF adsorption tower 26 to allow uncondensed HF gas and non-condensable gas to enter the HF adsorption tower 26, where the HF gas is adsorbed and retained.

[0072] Step 2.5: The remaining non-condensable gas enters the gas storage tank 28. After the pressure rise in the gas storage tank 28 stabilizes by observing the pressure gauge 29, the gas storage tank 28 has finished collecting the non-condensable gas. Start the vacuum pump 30, evacuate the gas storage tank 28, and then stop the vacuum pump 30. The purification of the first group of containers 30B is completed.

[0073] Step 3: Calculate the amount of HF collected in HF adsorption tower 26 and the air mass in gas storage tank 28.

[0074] Step 3.1: During the purification process, the amount of HF collected is confirmed by the weight change of the electronic scale 27 of the HF adsorption tower 26.

[0075] Step 3.2: According to the ideal gas law PV=nRT, calculate the air mass by measuring the pressure of the air tank pressure gauge 29 through the air tank 28, and record it as: m1.

[0076] Step 4: Transfer the light impurity gas in container 8 of the second group 30B to buffer container 16, and repeat steps 2 and 3.

[0077] Step 4.1: Close the receiving valve 6 of the second group of 30B containers, and withdraw the second group of 30B containers 8 from receiving. The first group of 30B containers 3 and the third group of 30B containers 13 will continue to receive materials in parallel.

[0078] Step 4.2: Freeze the second set of 30B containers for 30 minutes to allow UF6 to fully solidify.

[0079] Step 4.3: Open the purification valve 10 of the second group 30B container to connect the second group 30B container 8 with the buffer container 16. Transfer the light impurity gas HF and air accumulated in the second group 30B container 8 to the buffer container 16 using the pressure difference. Monitor the pressure drop in the second group 30B container 8 through the inlet pressure gauge 7 of the second group 30B container until the pressure of the second group 30B container 8 and the buffer container 16 reach equilibrium, then close the purification valve 10 of the second group 30B container.

[0080] Step 4.4: Open the second group 30B container receiving valve 6 and connect it to the receiving process.

[0081] Repeat steps 2 and 3 to calculate the purified air mass in container 8 of the second group 30B, denoted as m2.

[0082] Step 5: Transfer the light impurity gas from container 13 (30B) in the third group to buffer container 16. Repeat steps 2 and 3 until the light impurity gas from all groups' containers (30B) has been transferred to buffer container 16. Repeat steps 2 and 3 until purification is complete.

[0083] Step 5.1: Close the receiving valve 11 of the third group 30B container, and withdraw the third group 30B container 13 from receiving. The first group 30B container 3 and the second group 30B container 8 will continue to receive materials in parallel.

[0084] Step 5.2: Freeze container 30B of group 3 for 30 minutes to allow UF6 to fully condense into a solid state.

[0085] Step 5.3: Open the purification valve 15 of the third group 30B container to connect the third group 30B container 13 with the buffer container 16. Transfer the light impurity gas HF and air accumulated in the third group 30B container 13 to the buffer container 16 using the pressure difference. Monitor the pressure drop in the third group 30B container 13 through the pressure gauge 12 at the inlet of the third group 30B container until the pressure of the third group 30B container 13 and the buffer container 16 reach equilibrium, then close the purification valve 15 of the third group 30B container.

[0086] Step 5.4: Open the receiving valve 11 of the third group 30B container and connect it to the receiving process.

[0087] Repeat steps 2 and 3 to calculate the purified air mass in container 13 of the third group 30B, denoted as m3. The purification process is then complete.

[0088] Step 6: Summarize and calculate the total amount of light impurities removed in this purification process.

[0089] The total amount of light impurities removed in this purification process is: m1 + m2 + m3 = M1.

[0090] Step 7: Summarize and calculate the total amount of light impurity air purified on that day.

[0091] The total amount of light impurities purified that day is: M1 + M2 + M3... = M, which is entered into the data system.

[0092] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A method for purifying containers of multiple parallel products in a uranium enrichment plant, characterized in that, A uranium enrichment plant multi-parallel product container purification device is adopted. The device includes: a receiving unit, a buffer container (16), a purification container, an HF adsorption tower (26), a gas storage tank (28), and a vacuum pump (30). The receiving unit, buffer container (16), purification container, HF adsorption tower (26), gas storage tank (28), and vacuum pump (30) are connected in sequence. The receiving unit includes multiple sets of 30B containers connected in parallel. Each set of 30B containers includes multiple 30B containers. The 30B containers are installed inside the cold air box, and the purification container is installed inside the refrigeration cabinet. The receiving unit includes a first set of 30B containers (3), a second set of 30B containers (8), and a third set of 30B containers (13) connected in parallel. A receiving valve (1) for the first set of 30B containers (3) is installed at the inlet of the first set of 30B containers (3), and a purification valve (5) for the first set of 30B containers (3) is installed at the outlet of the first set of 30B containers (3). The method includes: Step 1: Transfer the light impurity gas in the first group 30B container (3) to the buffer container (16); Step 2: Purify the light impurity gas transferred to the buffer container (16); Step 3: Calculate the amount of HF collected in the HF adsorption tower (26) and the air mass in the gas storage tank (28); Step 4: Transfer the light impurity gas in the second group 30B container (8) to the buffer container (16), and repeat steps 2 and 3; Step 5: Transfer the light impurity gas in the third group 30B container (13) to the buffer container (16), repeat steps 2 and 3 until the light impurity gas in all groups of 30B containers is transferred to the buffer container (16), repeat steps 2 and 3, and the purification ends. Step 6: Summarize and calculate the total amount of light impurities removed from the air during this purification process; Step 7: Summarize and calculate the total amount of light impurities purified in the air that day, and enter the data into the system; Step 1 includes: Step 1.1: Close the receiving valve (1) of the first group of 30B containers and remove the first group of 30B containers (3) from the receiving area; Step 1.2: Freeze the first group of 30B containers (3); Step 1.3: Open the first group 30B container purification valve (5) to connect the first group 30B container (3) with the buffer container (16) until the pressure of the first group 30B container (3) and the buffer container (16) reaches equilibrium, then close the first group 30B container purification valve (5). Step 1.4: Open the first group of 30B container receiving valve (1) and incorporate the first group of 30B containers (3) into the receiving process.

2. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 1, characterized in that, The 30B container is equipped with a receiving valve at the inlet and a purification valve at the outlet. The 30B container is connected to the buffer container (16) via the purification valve. The buffer container (16) is connected to the purification container via an electric regulating valve (17). The purification container is connected to the HF adsorption tower (26) via the inlet valve (25) of the HF adsorption tower itself.

3. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 2, characterized in that, A pressure gauge is installed at the inlet of the 30B container, which is located downstream of the receiving valve of the 30B container; a pressure gauge is installed at the inlet of the purification container; and a pressure gauge (29) is installed on the gas storage tank (28).

4. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 3, characterized in that, An electronic scale (27) for the HF adsorption tower is installed at the bottom of the HF adsorption tower (26).

5. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 1, characterized in that, The purification containers include a primary purification container (19) and a secondary purification container (23). The primary purification container (19) is installed inside the primary refrigeration cabinet (20). A primary purification container inlet pressure gauge (18) is installed at the inlet of the primary purification container (19). The primary purification container inlet pressure gauge (18) is located downstream of the electric regulating valve (17). The secondary purification container (23) is installed inside the secondary refrigeration cabinet (24). A secondary purification container inlet pressure gauge (21) and a secondary purification container inlet valve (22) are installed at the inlet of the secondary purification container (23). The secondary purification container inlet valve (22) is located downstream of the secondary purification container inlet pressure gauge (21). The primary purification container (19) is connected to the secondary purification container (23) via the secondary purification container inlet pressure gauge (21) and the secondary purification container inlet valve (22). The secondary purification container (23) is connected to the HF adsorption tower (26) via the HF adsorption tower inlet valve (25).

6. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 5, characterized in that, Each of the three groups of 30B containers (3), (8) and (13) consists of two 30B containers.

7. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 6, characterized in that, The first group of 30B containers (3) is installed inside the first group of cold air boxes (4). The inlet pressure gauge (2) of the first group of 30B containers (3) is installed at the inlet of the first group of 30B containers (3). The inlet and outlet of the first group of 30B containers (3) are connected to form a first connecting pipeline. The first connecting pipeline and the inlet pressure gauge (2) of the first group of 30B containers are located downstream of the receiving solenoid valve (1) of the first group of 30B containers and upstream of the purification solenoid valve (5) of the first group of 30B containers. The first group of 30B containers (3) is connected to the buffer container (16) through the purification solenoid valve (5) of the first group of 30B containers. The second group of 30B containers (8) is installed inside the second group of cold air boxes (9). The inlet of the second group of 30B containers (8) is equipped with the second group of 30B container receiving solenoid valve (6) and the second group of 30B container inlet pressure gauge (7). The outlet of the second group of 30B containers (8) is equipped with the second group of 30B container purification solenoid valve (10). The inlet and outlet of the second group of 30B containers (8) are connected to form a second connecting pipeline. The second connecting pipeline and the second group of 30B container inlet pressure gauge (7) are located downstream of the second group of 30B container receiving solenoid valve (6) and upstream of the second group of 30B container purification solenoid valve (10). The second group of 30B containers (8) is connected to the buffer container (16) through the second group of 30B container purification solenoid valve (10). The third group of 30B containers (13) is installed inside the third group of cold air boxes (14). The third group of 30B containers (13) is equipped with a receiving solenoid valve (11) and a pressure gauge (12) at the inlet of the third group of 30B containers (13). The third group of 30B containers (13) is equipped with a purification solenoid valve (15) at the outlet of the third group of 30B containers (13). The inlet and outlet of the third group of 30B containers (13) are connected to form a third connecting pipeline. The third connecting pipeline and the pressure gauge (12) at the inlet of the third group of 30B containers are located downstream of the receiving solenoid valve (11) and upstream of the purification solenoid valve (15). The third group of 30B containers (13) is connected to the buffer container (16) through the purification solenoid valve (15).

8. The purification method for multi-parallel product containers in a uranium enrichment plant according to claim 1, characterized in that, Step 2 includes: Step 2.1: Connect the buffer container (16), the primary purification container (19), the secondary purification container (23), the HF adsorption tower (26), and the gas storage tank (28). Step 2.2: Adjust the set value of the electric regulating valve (17) to control the pressure of the inlet pressure gauge (18) of the primary purification container to not exceed 6 Torr, and the primary purification container (19) collects UF6 condensed into solid. Step 2.3: Adjust the opening of the valve (22) at the inlet of the secondary purification container. The pressure of the pressure gauge (21) at the inlet of the secondary purification container shall not exceed 2 Torr. The secondary purification container (23) collects the condensed UF6 in solid form. Step 2.4: Control the opening of the valve (25) at the inlet of the HF adsorption tower itself, and the HF adsorption tower (26) adsorbs HF gas; Step 2.5: Observe the pressure gauge (29) of the gas storage tank. After the pressure rise in the gas storage tank (28) stabilizes, the gas storage tank (28) has finished collecting non-condensable gases. Start the vacuum pump (30), evacuate the gas storage tank (28), and then stop the vacuum pump (30) to finish the purification process.

9. A method for purifying multi-parallel product containers in a uranium enrichment plant according to claim 8, characterized in that, Step 3 includes: Step 3.1: Calculate the amount of HF collected by measuring the weight change of the electronic scale (27) of the HF adsorption tower (26); Step 3.2: Calculate the air mass based on the ideal gas law PV=nRT, using the pressure gauge (29) of the gas storage tank (28).

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