Uranium concentration factory regulating valve online debugging system and method

Abstract

The invention belongs to the technical field of uranium concentration, and particularly relates to an online debugging system and method for a regulating valve of a uranium concentration factory. The system comprises at least two raw material containers, at least three block valves and at least one purification material receiving container, the at least two raw material containers are mutually connected in parallel and are respectively connected to the feeding main pipe loop line through independent branch pipelines; the feeding main pipe loop line is connected with the centrifugal cascade; each branch pipeline is connected in series with a regulating valve; uranium hexafluoride gas is stored in the at least two raw material containers; at least three block valves are connected in series on the feeding main pipe loop line and are respectively positioned between two adjacent raw material containers and between the raw material containers and the centrifugal cascade; and the purifying and collecting container is respectively connected with an outlet of each raw material container through a feeding and purifying pipeline. The regulating valve can be debugged and verified online by using a uranium hexafluoride medium, so that the problem that real working conditions cannot be simulated due to great difference from actual working conditions when static and dynamic debugging and verification are performed offline by using an air medium is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of uranium enrichment, and in particular relates to an online debugging system and method for a regulating valve in a uranium enrichment plant. Background Art

[0002] The function of the feed and take-out plant of a uranium enrichment plant is to continuously supply purified gaseous uranium hexafluoride raw materials with stable flow and pressure to the centrifugal cascade through the material flow pipeline. The refined and lean materials separated from the centrifugal cascade are then transported to the feed and take-out plant through the material flow pipeline, and collected by the refined and lean material containers respectively. In the feed system of the feed and take-out plant, the function of its regulating valve is to maintain a constant feed pressure or flow by adjusting the valve opening to ensure the safe and stable operation of the cascade system. With the continuous advancement of regulating valve technology, various regulating valves using new technologies have also been promoted and applied in domestic uranium enrichment plants, and some problems that need to be solved have also been revealed during the application process.

[0003] The regulating valve has been debugged in accordance with national standards before leaving the factory. The inherent flow characteristics and various technical indicators of the valve meet the functional requirements. Due to the special nuclear material control of uranium hexafluoride gas, its static characteristics, dynamic characteristics and other regulating characteristics before being put into use are debugged and verified under the air medium. The molecular weight of uranium hexafluoride gas and air is quite different, and the air medium cannot simulate the uranium hexafluoride gas flow. Therefore, static and dynamic debugging under air conditions cannot accurately verify whether the static and dynamic characteristics of the regulating valve meet the regulation characteristics requirements of uranium hexafluoride medium in uranium enrichment plants. Summary of the invention

[0004] The purpose of the present application is to provide an online debugging system and method for a regulating valve in a uranium enrichment plant, so as to solve the problem that static and dynamic debugging in air state in the prior art cannot accurately verify whether the static and dynamic characteristics of the regulating valve meet the requirements of the regulating characteristics of the uranium hexafluoride medium in the uranium enrichment plant.

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

[0006] The first invention of the embodiment of the present application provides an online debugging system for regulating valves in a uranium enrichment plant, the system comprising: at least two raw material containers, and at least three cut-off valves;

[0007] The at least two raw material containers are connected in parallel to each other and are connected to the feed main pipe loop through separate branch pipelines; the feed main pipe loop is connected to the centrifugal cascade; each branch pipeline is connected in series with a regulating valve; the at least two raw material containers contain uranium hexafluoride gas;

[0008] The at least three cut-off valves are connected in series on the feed main loop, and are respectively located between two adjacent raw material containers and between the raw material container and the centrifugal cascade;

[0009] The system further comprises: at least one purification material receiving container;

[0010] The purification material receiving container is connected to the outlet of each raw material container through a material supply purification pipeline.

[0011] Optionally, the system further includes: a heating box mounted on the outside of each raw material container.

[0012] Optionally, the system includes at least three raw material containers and at least four shut-off valves.

[0013] Optionally, the at least four shut-off valves include: a first shut-off valve, a second shut-off valve, a third shut-off valve and a fourth shut-off valve; the at least three raw material containers include: a first raw material container, a second raw material container and a third raw material container;

[0014] The first cut-off valve, the second cut-off valve, the third cut-off valve and the fourth cut-off valve are connected in series one by one on the supply main pipe loop line;

[0015] The outlet of the first raw material container is connected in series with the first regulating valve and then connected to the supply main pipe loop between the first cut-off valve and the second cut-off valve; the outlet of the second raw material container is connected in series with the second regulating valve and then connected to the supply main pipe loop between the second cut-off valve and the third cut-off valve; the outlet of the third raw material container is connected in series with the third regulating valve and then connected to the supply main pipe loop between the third cut-off valve and the fourth cut-off valve;

[0016] The outlet of the first raw material container is also connected in series with the first purification solenoid valve and then connected to the purification receiving container through a supply purification pipeline; the outlet of the second raw material container is also connected in series with the second purification solenoid valve and then connected to the purification receiving container through a supply purification pipeline; the outlet of the third raw material container is also connected in series with the third purification solenoid valve and then connected to the purification receiving container through a supply purification pipeline.

[0017] Optionally, the system comprises at least two of the purification receiving containers: a first purification receiving container and a second purification receiving container;

[0018] The inlet of the first purification material receiving container is connected in series with the first inlet electric valve and then connected to the material supply purification pipeline;

[0019] The inlet of the second purification material receiving container is connected in series with the second inlet electric valve and then connected to the material supply purification pipeline.

[0020] Optionally, electronic scales are provided at the lower parts of the raw material container and the purification material receiving container.

[0021] Optionally, pressure gauges are connected in series at both the front and rear ends of each regulating valve.

[0022] Optionally, the outlet of each raw material container is provided with a raw material container valve; and the inlet of each purification material receiving container is provided with a purification material receiving container valve.

[0023] Optionally, each of the purification material receiving containers is provided with a purification cold air box outside.

[0024] The second invention of the embodiment of the present application provides an online debugging method for a regulating valve in a uranium enrichment plant, which is applied to any one of the online debugging systems for regulating valves in a uranium enrichment plant provided by the first invention of the embodiment of the present application; the method comprises:

[0025] Keep the shutoff valve between two adjacent raw material containers open, and close the shutoff valve between the raw material container and the centrifugal cascade;

[0026] The uranium hexafluoride gas in one of the raw material containers is controlled to pass through the regulating valve on the corresponding branch pipeline, the feed main pipe loop line and the regulating valve on the corresponding branch of another raw material container, and then enter the purification receiving container through the feed purification pipeline.

[0027] The beneficial technical effects of this application are:

[0028] The embodiment of the present application provides an online debugging system and method for regulating valves in a uranium enrichment plant. The system comprises: at least two raw material containers, and at least three shut-off valves; the at least two raw material containers are connected in parallel to each other and are respectively connected to a feed main pipe loop through separate branch pipelines; the feed main pipe loop is connected to a centrifugal cascade; a regulating valve is connected in series to each branch pipeline; uranium hexafluoride gas is stored in the at least two raw material containers; the at least three shut-off valves are connected in series to the feed main pipe loop, and are respectively located between two adjacent raw material containers and between the raw material containers and the centrifugal cascade; the system further comprises: at least one purification receiving container; the purification receiving container is respectively connected to the outlet of each raw material container through a feed purification pipeline. In the embodiment of the present application, the regulating valve can be debugged and verified online using uranium hexafluoride medium, which solves the problem that when air medium is used for static and dynamic debugging and verification offline, the air density and flow rate are greatly different from the actual working conditions of uranium hexafluoride in the factory and the real working conditions cannot be simulated. The safety and accuracy of the static and dynamic debugging and verification of the regulating valve are improved, the working conditions of the feeding system are ensured to be stable, and the application and debugging requirements of the subsequent regulating valve in the uranium enrichment modular factory are met, which provides a certain technical solution and research basis for the standardized construction of large-scale uranium enrichment plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of an online debugging system for a regulating valve in a uranium enrichment plant provided in an embodiment of the present application;

[0030] Figure 2A schematic structural diagram of another uranium enrichment plant regulating valve online debugging system provided in an embodiment of the present application.

[0031] In the figure:

[0032] 1- centrifugal cascade; 2- feed main loop; 3- first shut-off valve; 4- second shut-off valve; 5- third shut-off valve; 6- fourth shut-off valve; 7- first purification electric valve; 8- second purification electric valve; 9- third purification electric valve; 10- feed purification pipeline; 11- first pressure gauge; 12- second pressure gauge; 13- third pressure gauge; 14- fourth pressure gauge; 15- fifth pressure gauge; 16- sixth pressure gauge; 17- first inlet electric valve; 18- second inlet electric valve; 19- first regulating valve; 20- second regulating valve; 21 -the third regulating valve; 22-the first heating box; 23-the second heating box; 24-the third heating box; 25-the first purification cold air box; 26-the second purification cold air box; 27-the first raw material container valve; 28-the second raw material container valve; 29-the third raw material container valve; 30-the first purification receiving container valve; 31-the second purification receiving container valve; 32-the first raw material container; 33-the second raw material container; 34-the third raw material container; 38-the first purification receiving container; 39-the second purification receiving container. DETAILED DESCRIPTION

[0033] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0034] See also Figure 1 , which is a structural schematic diagram of an online debugging system for a regulating valve in a uranium enrichment plant provided in an embodiment of the present application.

[0035] An online debugging system for regulating valves in a uranium enrichment plant provided in an embodiment of the present application includes: at least two raw material containers, and at least three cut-off valves;

[0036] The at least two raw material containers are connected in parallel to each other and are connected to the feed main pipe loop line 2 through separate branch pipelines; the feed main pipe loop line 2 is connected to the centrifugal cascade 1; each branch pipeline is connected in series with a regulating valve; the at least two raw material containers contain uranium hexafluoride gas;

[0037] The at least three shut-off valves are connected in series on the feed main loop 2, and are respectively located between two adjacent raw material containers and between the raw material container and the centrifugal cascade 1;

[0038] It can be understood that in order to ensure that the raw material meets the light impurity qualification requirements of the centrifugal cascade, the raw material container needs to be purified to be qualified before feeding to the centrifugal cascade 1, that is, the light impurities in the raw material container are released into the purification receiving container. The system also includes: at least one purification receiving container;

[0039] The purification material receiving container is connected to the outlet of each raw material container through a material supply purification pipeline 10.

[0040] It should be noted that in the uranium enrichment supply and withdrawal plant, since the feed pressure and flow rate of the centrifugal cascade need extremely high stability, if the static and dynamic debugging verification of the regulating valve is carried out under stable operating conditions, it will cause large fluctuations in the feed pressure and flow rate, thereby causing process accidents. For this reason, the embodiment of the present application closes and isolates part of the pipeline and device in the feed main pipe loop 2, uses the raw material container to supply the uranium hexafluoride raw material through the regulating valve, and then returns to another raw material container feeding point through the closed feed main pipe loop 2 in an isolated state, and then recovers the uranium hexafluoride used for debugging to the purification receiving container through the feed purification pipeline 10 at its point, so as to realize the online static and dynamic debugging verification of the regulating valve in the closed isolation pipeline, and at the same time, the reverse circulation of the raw material can also be carried out to perform static and dynamic debugging verification on the regulating valve of the original system, so as to obtain the trend comparison curve of the regulating valve to be verified and the original regulating valve.

[0041] In some possible implementations of the present application, the system further includes: a heating box mounted outside each of the raw material containers. Figure 1 The first heating box 22, the second heating box 23 and the third heating box 24 are shown.

[0042] It is understandable that, during the preparation of the static and dynamic characteristic parameter curves, if it is necessary to increase or decrease the uranium hexafluoride flow rate, this can be achieved by changing the temperature of the heating box.

[0043] In one example, the system includes at least two of the purification receiving containers: a first purification receiving container 38 and a second purification receiving container 39;

[0044] The inlet of the first purification material receiving container 38 is connected in series with the first inlet electric valve 17 and then connected to the supply purification pipeline 10;

[0045] The inlet of the second purification material receiving container 39 is connected in series with the second inlet electric valve 18 and then connected to the supply purification pipeline 10.

[0046] It is understandable that during the static and dynamic characteristic parameter curves, if the flow rate of uranium hexafluoride needs to be increased or decreased, the first purification receiving container 38 and the second purification receiving container 39 can be connected in parallel to receive the material, so as to achieve the purpose of increasing or decreasing the flow rate of uranium hexafluoride required for debugging. If it is necessary to generate a pressure or flow disturbance after the regulating valve to test the anti-disturbance performance, the pressure or flow after the regulating valve can be disturbed by operating to open or close the opening of the first inlet electric valve 17 or the second inlet electric valve 18 of the purification receiving container.

[0047] In some possible implementations of the embodiments of the present application, the system includes at least three raw material containers and at least four shut-off valves.

[0048] It should be noted that when testing a certain regulating valve, the remaining raw material containers can be used to feed the centrifugal cascade 1 normally without affecting the normal feeding operation conditions. During normal feeding, one raw material container or multiple raw material containers are used to feed in parallel. During feeding, the shut-off valves on the feeding main loop 2 are all in an open state, and the raw materials flow from the raw material container through the regulating valve to the feeding main loop 2 to the centrifugal cascade 1. When it is necessary to overhaul individual equipment or valves, the shut-off valve on the corresponding feeding main is closed to isolate it from the normally operating feeding main, so as to achieve continuous feeding to the centrifugal cascade 1 without interruption when overhauling the point.

[0049] In a specific example, Figure 1 and 2 As shown, the at least four shut-off valves include: a first shut-off valve 3, a second shut-off valve 4, a third shut-off valve 5 and a fourth shut-off valve 6; the at least three raw material containers include: a first raw material container 32, a second raw material container 33 and a third raw material container 34;

[0050] The first shut-off valve 3, the second shut-off valve 4, the third shut-off valve 5 and the fourth shut-off valve 6 are connected in series one by one on the feed main loop line 2;

[0051] The outlet of the first raw material container 32 is connected in series with the first regulating valve 19 and then connected to the supply main pipe loop line 2 between the first shut-off valve 3 and the second shut-off valve 4; the outlet of the second raw material container 33 is connected in series with the second regulating valve 20 and then connected to the supply main pipe loop line 2 between the second shut-off valve 4 and the third shut-off valve 5; the outlet of the third raw material container 34 is connected in series with the third regulating valve 21 and then connected to the supply main pipe loop line 2 between the third shut-off valve 5 and the fourth shut-off valve 6;

[0052] The outlet of the first raw material container 32 is also connected in series with the first purification solenoid valve 7 and then connected to the purification receiving container through the supply purification pipeline 10; the outlet of the second raw material container 33 is also connected in series with the second purification solenoid valve 8 and then connected to the purification receiving container through the supply purification pipeline 10; the outlet of the third raw material container 34 is also connected in series with the third purification solenoid valve 9 and then connected to the purification receiving container through the supply purification pipeline 10.

[0053] As an example, when the first regulating valve 19 is a regulating valve to be verified, before online debugging, it is necessary to close the first shut-off valve 3 and the third shut-off valve 5 on the feed main loop 2, and the second shut-off valve 4 remains in an open state. At this time, the closed and isolated pipe sections are the first raw material container 32 and the second raw material container 33 between the first shut-off valve 3 and the third shut-off valve 5, and the raw material container 34 is in a normal feeding state. Its feed is not affected by the closed pipe section and continues to feed the centrifugal cascade 1 through the loop, thereby achieving the purpose of exiting any feeding point for maintenance without affecting the normal feeding of the system.

[0054] Similarly, if it is necessary to obtain the characteristic parameters of the first regulating valve 20 for comparison, the uranium hexafluoride gas can be circulated in reverse, that is, the uranium hexafluoride gas comes out of the second raw material container 33, passes through the second regulating valve 20, the pipe section between the first shut-off valve 3 on the feeding main line and the third shut-off valve 5 on the feeding main line, and then passes through the first regulating valve 19 and the first purification electric valve 7 in reverse to enter the purification pipeline 10, and then passes through the first inlet electric valve 17 to recover the uranium hexafluoride to the first purification receiving container 38, so that the uranium hexafluoride raw material used for debugging can be recovered and fed again.

[0055] In the embodiment of the present application, the raw material container to be purified does not affect the normal feeding of raw material containers at other points during purification. For example, when the second raw material container 33 and the third raw material container 34 are respectively fed to the centrifugal cascade 1 in parallel through the feed regulating valves 20 and 21 to the feed main loop line 2, if the first raw material container 32 needs to be purified at this time, check that the first regulating valve 19 is in the closed state, open the first purification electric valve 7, and release the light impurity gas in the first raw material container 32 to the first purification receiving container 38 or the second purification receiving container 39 through the purification pipeline 10, the first inlet electric valve 17 or the second inlet electric valve 18, and the purification of the first raw material container 32 can be completed. In the specific implementation, it can be arranged according to the flow rate of the raw material purification amount to use a single purification receiving container to collect materials or multiple purification receiving containers in parallel to collect materials.

[0056] In one example, electronic scales are provided at the bottom of the raw material container and the purification material receiving container for monitoring the weight loss of the raw material container and the material receiving amount of the purification material receiving container.

[0057] In another example, each of the regulating valves is connected in series with a pressure gauge at both ends. Figure 21 , a first pressure gauge 11 , a second pressure gauge 12 , a third pressure gauge 13 , a fourth pressure gauge 14 , a fifth pressure gauge 15 and a sixth pressure gauge 16 are shown in FIG.

[0058] In some possible implementations of the present application, the outlet of each raw material container is provided with a raw material container valve; the inlet of each purification material receiving container is provided with a purification material receiving container valve. Figure 2 As shown, the first raw material container has its own valve 27, the second raw material container has its own valve 28 and the third raw material container has its own valve 29, as well as the first purification receiving container has its own valve 30 and the second purification receiving container has its own valve 31.

[0059] It is understandable that if it is necessary to generate a pressure or flow disturbance before the regulating valve to test the anti-disturbance performance, the pressure or flow disturbance before the regulating valve can be generated by operating the opening and closing of the valve of the raw material container itself.

[0060] When the debugging of the first regulating valve 19 is to be verified, the uranium hexafluoride gas comes out of the first raw material container 32, passes through the first raw material container valve 27, the first pressure gauge 11, the first regulating valve 19, the fourth pressure gauge 14, the pipe section between the first shut-off valve 3 and the second shut-off valve 4 on the feed main loop, and then reversely passes through the fifth pressure gauge 15, the second regulating valve 20, the second purification electric valve 8 to enter the feed purification pipeline 10, and then passes through the first inlet electric valve 17 or the second inlet electric valve 18, the first purification receiving container valve 30 or the second purification receiving container valve 31, and the uranium hexafluoride is recovered to the first purification receiving container 38 or the second purification receiving container 39.

[0061] In one example, each of the purification material receiving containers is provided with a purification cold air box. Figure 1 The first clean cold air box 25 and the second clean cold air box 26 are shown in FIG.

[0062] The online debugging system of a regulating valve in a uranium enrichment plant provided by the embodiment of the present application has at least the following technical effects:

[0063] (1) The regulating valve can be debugged and verified online using uranium hexafluoride as a medium, which solves the problem that when using air as a medium for static and dynamic debugging and verification offline, the air density and flow rate are very different from the actual working conditions of uranium hexafluoride in the factory and cannot simulate the actual working conditions;

[0064] (2) During the online simulation of actual working conditions, the system is reliably and safely isolated from the normal feeding operation line, without interfering with the normal feeding pressure or flow, thus ensuring the safety and stability of the system.

[0065] (3) The existing equipment resources of the domestic uranium enrichment plant's material supply and retrieval plant were utilized without adding additional equipment and facilities, which effectively improved the utilization efficiency of the material supply and retrieval plant's resources and equipment, saved the hardware cost investment of the test site and commissioning and operation facilities, as well as the maintenance and labor costs of the test site, generated certain potential economic benefits, and had certain promotion and application value.

[0066] Based on the online debugging system for a uranium enrichment plant regulating valve provided in the above embodiment, the embodiment of the present application further provides an online debugging method for a uranium enrichment plant regulating valve, which is applied to any one of the online debugging systems for a uranium enrichment plant regulating valve provided in the above embodiment.

[0067] An online debugging method for a regulating valve in a uranium enrichment plant provided in an embodiment of the present application includes:

[0068] Step S101: keeping the shutoff valve between two adjacent raw material containers open, and closing the shutoff valve between the raw material container and the centrifugal cascade 1;

[0069] Step S102: Control the uranium hexafluoride gas in one of the raw material containers to pass through the regulating valve on the corresponding branch pipeline, the feed main pipe loop line 2 and the regulating valve on the corresponding branch of another raw material container, and then enter the purification receiving container through the feed purification pipeline 10.

[0070] The following describes in detail a method for online debugging of a regulating valve in a uranium enrichment plant provided by an embodiment of the present application with reference to a specific example.

[0071] An online debugging method for a regulating valve in a uranium enrichment plant provided in an embodiment of the present application includes:

[0072] Step 1: Installation and sealing test of the regulating valve to be debugged (i.e., the first regulating valve 19); wherein step 1 includes:

[0073] Step (1.1), reliably close the cut-off valves 3 and 5 of the feed main loop line, and reliably disconnect and isolate the pipe section between the first cut-off valve 3 and the second cut-off valve 5 of the feed main loop line 2 and the first raw material container 32 and the second raw material container 33 from the normal feed pipeline;

[0074] Step (1.2), recovering the uranium hexafluoride material in the pipe section between the first shut-off valve 3 and the second shut-off valve 5 and between the first raw material container 32 and the second raw material container 33;

[0075] Step (1.3), evacuate and purge the pipe sections before and after the first regulating valve 19 to ensure that they are qualified.

[0076] Step (1.4), remove the 4-20mA analog communication and power cables between the first regulating valve 19 and the DCS remote control system.

[0077] Step (1.5), loosen the fastening flange bolts of the first regulating valve 19, remove the first regulating valve 19, and install the regulating valve to be debugged as the first regulating valve 19 at the original position.

[0078] Step (1.6), connect the 4-20mA analog communication cable and power cable of the replaced first regulating valve 19 to the remote DCS control system.

[0079] Step (1.7), perform vacuum leak detection and vacuum measurement on the valve body and flange seal of the first regulating valve 19 until they are qualified.

[0080] Step (1.8), check that the cable connection of the first regulating valve 19 should be firm and reliable; all screws, bolts and connectors should be firm and not loose, and the cable markings should be complete and correct; the connection of the electrical device grounding wire should be correct and firm; the external connection plug of the regulating valve should be clean.

[0081] Step (1.9), the sealing performance of the valve core channel of the first regulating valve 19 is judged to be qualified.

[0082] Step 2: Static test of the control valve (such as zero point and full point, valve opening consistency and full stroke switch time debugging); Step 2 includes:

[0083] Step (2.1), check that the power supply voltage of the first regulating valve 19 should be within the range of AC (220±22)V, (50±1)Hz, and turn on the power supply of the controller of the first regulating valve 19;

[0084] Step (2.2), check that the first regulating valve 19 controller is powered on and starts self-testing without abnormality;

[0085] Step (2.3), open and close the regulating valve on the first regulating valve 19 controller operation panel to verify that the forward and reverse rotation switch functions of the driving motor are normal;

[0086] Step (2.4), operate the first regulating valve 19 controller to fully close the regulating valve, manually calibrate the valve position feedback sensor, so that the local valve position feedback display is 0%, and the corresponding valve position feedback output current value is 4mA, which is the valve position zero point.

[0087] Step (2.5), operate the regulating valve to fully open in the first regulating valve 19 controller, calibrate the valve position feedback value, make the local valve position feedback display 100%, at this time the corresponding valve position feedback output current value is 20mA, which is the full valve position point.

[0088] In step (2.6), the opening degrees of the first regulating valve 19 operated locally are 0%, 25%, 50%, 75%, 100%, 75%, 50%, 25%, and 0% respectively.

[0089] Step (2.7), observe and record that the local displayed opening of the first regulating valve 19 is consistent with the remote DCS system feedback opening, and the valve position deviation between the local and remote DCS systems is not greater than 0.1%.

[0090] Step (2.8), remotely operate the opening of the first regulating valve 19 in the DCS system to be 0%, 25%, 50%, 75%, 100%, 75%, 50%, 25%, 0%, respectively, and the corresponding opening control currents are 4mA, 8mA, 12mA, 16mA, 20mA, 16mA, 12mA, 8mA, 4mA, and record the test parameters.

[0091] Step (2.9), observe and record that the output % opening of the first regulating valve 19 on the DCS system is consistent with the locally displayed % opening, and the valve position deviation between the local and remote DCS systems is not greater than 0.1%.

[0092] Step (2.10), open the first regulating valve 19 from 0% to 100% fully open, and then from 100% fully open to 0% fully closed, use a stopwatch to record the time (s) required from open→close→open, and test the full stroke time of the first regulating valve 19.

[0093] Step (2.11), repeat step (2.10) 5 times, record the average full stroke time of 5 times, which should meet the design requirements. If there is a deviation, connect the debugging computer and use the matching special software to adjust the motor speed to match its full stroke time to meet the process design requirements.

[0094] Step 3: Dynamic debugging line connection; wherein step 3 includes:

[0095] Step (3.1), check that the valve 27 of the first raw material container itself is in an open state, and the first heating box 22 is in a constant temperature heating state of 50° C., so that the pressure and flow rate of the uranium hexafluoride gas in the first raw material container 32 meet the test requirements.

[0096] Step (3.2), check that the first purification cold air box 25 is in a low temperature refrigeration state of -25°C, so that the uranium hexafluoride condensation and collection capacity meets the test requirements.

[0097] Step (3.3), check and close the first shut-off valve 3 and the third shut-off valve 5 on the feed main loop line, and keep the second shut-off valve 4 on the feed main loop line 2 open;

[0098] Step (3.4), check and close the first purification electric valve 7 and the second raw material container valve 28;

[0099] Step (3.5), open the second purification electric valve 8, open the first purification material receiving container valve 30 and the first inlet electric valve 17;

[0100] Step (3.6), remotely open the second regulating valve from 20% to 100% fully open in the DCS system and use it as a channel;

[0101] Step (3.7), at this time, the debugging circuit is connected, and the first regulating valve 19 can be operated to open by adjusting the target pressure setting value behind the regulating valve to be verified, and the uranium hexafluoride gas in the first raw material container 32 passes through the first raw material container valve 27, the first pressure gauge 11, the first regulating valve 19, the fourth pressure gauge 14, the feed main pipe loop line 2, the second cut-off valve 4, the fifth pressure gauge 15, the second regulating valve 20, the second purification electric valve 8, the purification pipeline 10, the first inlet electric valve 17, and the first purification receiving container valve 30, so that the uranium hexafluoride gas used for testing is recovered to the first purification receiving container 38, thereby forming a uranium hexafluoride material circulation channel for continuous adjustment test.

[0102] In step (3.8), the flow rate can be continuously monitored by the weight changes of the electronic scale at the bottom of the first raw material container 32 and the electronic scale at the bottom of the first purification receiving container 38.

[0103] In step (3.9), if the flow rate does not meet the flow rate required for debugging, the second purification receiving container 39 or more purification receiving containers can be incorporated into the receiving container, or the temperature of the first heating box 22 can be continued to be increased to meet the needs of increasing or decreasing the debugging flow rate, thereby achieving a true simulation of the operating conditions of the system.

[0104] Step 4, dynamic debugging (step test); this step mainly tests the follow-up adjustment capability of the first regulating valve 19 controller when the target pressure setting value after the regulating valve is changed step by step, and observes whether the pressure regulation has overshoot and the time for the regulation oscillation to stabilize. Step 4 includes:

[0105] Step (4.1), on the DCS system, check that the uranium hexafluoride gas pressure in the first raw material container 32 in the first heating box 22 meets the saturation pressure at the heating temperature.

[0106] Step (4.2), on the operation interface of the DCS system, operate the set value (e.g., 10 mmHg) of the fourth pressure gauge 14 after the first regulating valve 19 with a step of 5 mmHg, observe the trend curve change of the fourth pressure gauge 14, and observe from the DCS system that the pressure stabilization time should meet *.5 seconds, and the curve should be smooth without overshoot, and record the PID parameter value of the first regulating valve 19;

[0107] Step (4.3), after the pressure of the fourth pressure gauge 14 is stable for 5 minutes, the target setting value of the fourth pressure gauge 14 is again increased by 5 mmHg as a step to 15 mmHg, and the trend curve change of the fourth pressure gauge 14 is observed. From the DCS system, it is observed that the pressure stabilization time should meet *.5 seconds, and the pressure trend curve is smooth without overshoot, which should be consistent with the original control valve reaction trend line;

[0108] Step (4.4), repeat 4.2 to 4.3, adjust the target pressure value of the fourth pressure gauge 14 to 70 mmHg in steps of 20 mmHg, 25 mmHg, 30 mmHg, 35 mmHg, 40 mmHg, 45 mmHg, 50 mmHg, 55 mmHg, 60 mmHg, 65 mmHg, and 70 mmHg, observe and record the weight change value of the electronic scale at the bottom of the first purification receiving container 38, observe and record the command opening output, opening feedback and pressure step upward trend curve of the first regulating valve 19, and truly simulate the regulation and control performance of the first regulating valve 19 in the uranium hexafluoride medium.

[0109] Step (4.5), then lower the target pressure value of the fourth pressure gauge 14 to 10 mmHg in steps of 70 mmHg, 65 mmHg, 60 mmHg, 55 mmHg, 50 mmHg, 45 mmHg, 40 mmHg, 35 mmHg, 30 mHg, 25 mmHg, 20 mmHg, 15 mmHg, and 10 mmHg, observe and record the weight change value of the electronic scale at the bottom of the first purification receiving container 38, observe and record the command opening output, opening feedback, and pressure step downward trend curve of the first regulating valve 19.

[0110] After step (4.6) and steps 4.2 to 4.5 are completed, the pressure before the valve, the pressure after the valve, and the opening trend curve of the first regulating valve 19 are retrieved and archived to a document on the DCS system, the test data is saved and printed through a printer, the test time is recorded, and the upward and downward step test items are completed.

[0111] Step 5, dynamic debugging (such as pre-valve pressure disturbance); this experiment mainly tests the follow-up adjustment ability of the first regulating valve 19 when the pre-valve pressure of the first regulating valve 19 fluctuates, and observes whether there is overshoot in the pressure adjustment and the oscillation stabilization time. Step 5 includes

[0112] Step (5.1), according to step 4.2, establish a steady-state pressure (i.e., constant pressure and constant flow) working condition of the first regulating valve 19, for example: set the target pressure value of the fourth pressure gauge 14 of the first regulating valve 19 to 60 mmHg, at which time uranium hexafluoride gas continuously flows from the first raw material container 32, through the first raw material container valve 27, the first regulating valve 19 to adjust the target pressure value to 60 mmHg, and then through the feed main loop 2, the second regulating valve 20, the second purification electric valve 8, the purification pipeline 10, the first purification receiving container inlet electric valve 17, the first purification receiving container valve 30, and the first purification receiving container 38, to reach a steady-state working condition;

[0113] Step (5.2), quickly close the first raw material container valve 27 of the first raw material container 32, and then quickly open the first raw material container valve 27 after 2 seconds. At this time, the pressure in front of the first regulating valve 19 will be disturbed, and the opening of the first regulating valve 19 will change, causing the target pressure value of the fourth pressure gauge 14 after the first regulating valve 19 to oscillate; observe the pressure oscillation trend curve and time of the fourth pressure gauge 14, the curve should be smooth and without overshoot, and the pressure stabilization time should be consistent with the pressure stabilization time of the original working regulating valve of the system or better than the pressure stabilization time of the disturbance in front of the original regulating valve; if the oscillation stabilization time of the disturbance in front of the regulating valve 19 does not meet the technical requirements, the PID setting value of the first regulating valve 19 is optimized and adjusted until it meets the requirements.

[0114] Step (5.3) retrieves the pressure and opening trend curves of the first pressure gauge 11 and the fourth pressure gauge 14 on the DCS system and files them in a document, saves and prints the test data through a printer, records the test time, and completes the pre-valve pressure disturbance test item.

[0115] Step 6, dynamic debugging (valve rear pressure disturbance); This experiment mainly tests the follow-up adjustment ability of the regulating valve 19 when the valve rear pressure fluctuates, and observes whether the pressure regulation has overshoot and the oscillation stabilization time. Step 6 includes:

[0116] Step (6.1), establish a steady-state condition according to step (5.1);

[0117] Step (6.2), close the first inlet electric valve 17, and then open the first inlet electric valve 17 after 2 seconds. At this time, the pressure of the fourth pressure gauge 14 after the first regulating valve 19 will be disturbed, and the opening of the first regulating valve 19 will change, causing the target pressure value of the fourth pressure gauge 14 to oscillate;

[0118] Step (6.3), observe the pressure oscillation trend curve and time of the fourth pressure gauge 14. The curve should be smooth and without overshoot. The stabilization time should be consistent with the stabilization time of the original working control valve of the system or better than the stabilization time of the disturbance before the original control valve. If the oscillation stabilization time of the disturbance after the first control valve 19 does not meet the technical requirements, the PID setting value of the first control valve 19 is optimized and adjusted until it meets the requirements.

[0119] Step (6.4) retrieves the pressure and opening trend curves of the first pressure gauge 11 and the fourth gauge 14 on the DCS system and files them in a document, saves and prints the test data through a printer, records the test time, and completes the post-valve pressure disturbance test item.

[0120] Step 7, obtaining the static and dynamic test trend curves of the original control valve; this step is mainly to obtain the static and dynamic test trend curves of the original control valve 20 on the system, so as to compare them with the performance parameters of the control valve to be debugged. Step 7 includes

[0121] Step (7.1), fully open the first regulating valve 19 100% as a channel, and perform static and dynamic tests on the second regulating valve 20 with reference to steps 2, 3, 4, 5, and 6, so as to obtain the performance parameters of the original second regulating valve 20 on the system for comparison with the parameters of the first regulating valve 19.

[0122] Step 8: After the static and dynamic tests are completed, the line is restored and the regulating valve 19 to be debugged enters the next stage of assessment.

[0123] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. An online debugging system for regulating valves in a uranium enrichment plant, characterized in that: The system comprises: at least two raw material containers, and at least three shut-off valves; The at least two raw material containers are connected in parallel to each other and are connected to the feed main pipe loop (2) through separate branch pipelines; the feed main pipe loop (2) is connected to the centrifugal cascade (1); a regulating valve is connected in series to each of the branch pipelines; uranium hexafluoride gas is contained in the at least two raw material containers; The at least three shut-off valves are connected in series on the feed main loop (2), and are respectively located between two adjacent raw material containers and between the raw material container and the centrifugal cascade (1); The system further comprises: at least one purification material receiving container; The purification material receiving container is connected to the outlet of each raw material container through a material supply purification pipeline (10).

2. The uranium enrichment plant regulating valve online debugging system according to claim 1 is characterized in that: The system also includes: a heating box mounted on the outside of each raw material container.

3. The uranium enrichment plant regulating valve online debugging system according to claim 1 is characterized in that: The system comprises at least three raw material containers and at least four shut-off valves.

4. The uranium enrichment plant regulating valve online debugging system according to claim 3 is characterized in that: The at least four cut-off valves include: a first cut-off valve (3), a second cut-off valve (4), a third cut-off valve (5) and a fourth cut-off valve (6); the at least three raw material containers include: a first raw material container (32), a second raw material container (33) and a third raw material container (34); The first cut-off valve (3), the second cut-off valve (4), the third cut-off valve (5) and the fourth cut-off valve (6) are connected in series one by one on the material supply main pipe loop (2); The outlet of the first raw material container (32) is connected in series with the first regulating valve (19) and then connected to the supply main pipe loop (2) between the first shut-off valve (3) and the second shut-off valve (4); the outlet of the second raw material container (33) is connected in series with the second regulating valve (20) and then connected to the supply main pipe loop (2) between the second shut-off valve (4) and the third shut-off valve (5); the outlet of the third raw material container (34) is connected in series with the third regulating valve (21) and then connected to the supply main pipe loop (2) between the third shut-off valve (5) and the fourth shut-off valve (6); The outlet of the first raw material container (32) is also connected in series with the first purification solenoid valve (7) and then connected to the purification receiving container through a supply purification pipeline (10); the outlet of the second raw material container (33) is also connected in series with the second purification solenoid valve (8) and then connected to the purification receiving container through a supply purification pipeline (10); the outlet of the third raw material container (34) is also connected in series with the third purification solenoid valve (9) and then connected to the purification receiving container through a supply purification pipeline (10).

5. The uranium enrichment plant regulating valve online debugging system according to claim 1 is characterized in that: The system comprises at least two purification receiving containers: a first purification receiving container (38) and a second purification receiving container (39); The inlet of the first purification material receiving container (38) is connected in series with the first inlet electric valve (17) and then connected to the material supply purification pipeline (10); The inlet of the second purification material receiving container (39) is connected in series with the second inlet electric valve (18) and then connected to the supply purification pipeline (10).

6. The online debugging system for regulating valves in a uranium enrichment plant according to any one of claims 1 to 5, characterized in that: The lower parts of the raw material container and the purification material receiving container are both provided with electronic scales.

7. The online debugging system for regulating valves in a uranium enrichment plant according to any one of claims 1 to 5, characterized in that: The front and rear ends of each regulating valve are connected in series with a pressure gauge.

8. The online debugging system for regulating valves in a uranium enrichment plant according to any one of claims 1 to 5, characterized in that: The outlet of each raw material container is provided with a raw material container valve; the inlet of each purification material receiving container is provided with a purification material receiving container valve.

9. The online debugging system for regulating valves in a uranium enrichment plant according to any one of claims 1 to 5, characterized in that: Each of the purification material receiving containers is provided with a purification cold air box.

10. A method for online debugging of a regulating valve in a uranium enrichment plant, characterized in that: The method is applied to the online debugging system of the regulating valve of a uranium enrichment plant according to any one of claims 1 to 9; the method comprises: Keeping the shutoff valve between two adjacent raw material containers open, and closing the shutoff valve between the raw material container and the centrifugal cascade (1); The uranium hexafluoride gas in one of the raw material containers is controlled to pass through the regulating valve on the corresponding branch pipeline, the feed main pipe loop (2) and the regulating valve on the corresponding branch of another raw material container, and then enter the purification receiving container through the feed purification pipeline (10).

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