Gas flow simulation method and device for dissolver chute

Abstract

The invention provides a gas flow simulation method and device for a dissolver chute. The method comprises the steps that structural parameters of the dissolver chute and a connecting device of a target spent fuel aftertreatment system are obtained; determining operation parameters of a dissolver chute and a connecting device of the target spent fuel post-processing system during operation; according to the structure parameters and the operation parameters, simulating the gas flow at the chute of the dissolver chute and the connecting device in the operation state to obtain a gas flow simulation result; determining an error of a gas flow simulation result; when the error is within a preset range, obtaining a simulation model; and according to the simulation model, performing simulation analysis on gas flow of the dissolver chute and the connecting device to obtain a gas flow simulation result. According to the scheme provided by the invention, the gas flow condition at the dissolver chute of the spent fuel post-processing system can be simulated, so that the structural parameters and operating parameters of the chute are optimized, and the operating stability and economical efficiency of the spent fuel post-processing head end are improved.

Description

Technical Field

[0001] The invention relates to the technical field of spent fuel post-processing, and in particular to a gas flow simulation method and device for a dissolver chute. Background Art

[0002] Spent fuel reprocessing is a very important part of achieving a closed cycle of nuclear fuel and ensuring the sustainable development of nuclear energy. At present, spent fuel reprocessing mainly includes: cooling process, first-end processing process, chemical separation process, tail-end processing process and radioactive waste treatment and disposal process.

[0003] Among them, the first-end treatment process is a very critical process. Its task is to mechanically disassemble the fuel elements and separate the fuel cores from the cladding materials through leaching. Its purpose is to remove as much as possible the parts other than the fuel core, that is, the cladding materials and other non-fuel components, so that they do not enter the chemical separation process to avoid affecting the chemical reaction, and try not to enter the high-level waste liquid to reduce the amount of waste treatment. The fuel solution obtained by leaching is adjusted to a liquid with a specific physical and chemical state for use in subsequent separation processes.

[0004] In the first-end processing, the dissolver is a device that ensures that the fuel core blocks are dissolved to generate fuel solution. It is connected to the shearing device through a chute, and the short sheared section enters the dissolver through the chute. The size structure and operating parameters of the dissolver are different for different spent fuel processing volumes in the shearing process. At the dissolver chute, there is compressed air pressed into the system and nitrogen oxide gas produced by the dissolver. The airflow is complex. If there is an exhaust peak of nitrogen oxide gas, it may cause abnormal airflow, so that the airflow carries the liquid upward, causing abnormal operation of the first-end processing process. In severe cases, it may cause blockage at the chute.

[0005] In order to ensure the safe and stable operation of the head-end treatment system, the structural parameters and operating parameters of the dissolver chute with different spent fuel treatment amounts need to be optimized to ensure the smooth flow of gas. However, due to the presence of a large amount of radioactive materials in the head-end treatment system during operation, the flow test research and phenomenon observation are very difficult, and will consume a lot of manpower and material resources, increasing economic and time costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a gas flow simulation method and device for a dissolver chute, which can simulate the gas flow conditions at the dissolver chute of a spent fuel reprocessing system, thereby optimizing the structural parameters and operating parameters of the chute and improving the stability and economy of the operation of the head end of the spent fuel reprocessing.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A gas flow simulation method for a dissolver chute, comprising:

[0009] Acquire structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute;

[0010] Determining operating parameters of a dissolver chute and a connecting device of the target spent fuel reprocessing system during operation;

[0011] According to the structural parameters and the operating parameters, simulating the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state to obtain a gas flow simulation result;

[0012] determining an error in the gas flow simulation result;

[0013] When the error is within a preset range, a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters is obtained;

[0014] According to the simulation model, a simulation analysis is performed on the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system to obtain a gas flow simulation result.

[0015] Optionally, obtain the structural parameters of the dissolver chute and connecting device of the target spent fuel reprocessing system, including:

[0016] Obtain the inner diameters of the upper chute of the dissolver and the lower chute of the dissolver, the length of the upper chute of the dissolver, the length of the lower chute of the dissolver, the horizontal angle of the lower chute of the dissolver, the inner wall radius of the shear exhaust outlet, and the inner wall radius of the dissolver exhaust outlet.

[0017] Optionally, determining the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system during operation includes:

[0018] Determine the air intake volume of the compressed air flowing into the shear short section and the compressed air inlet, the shear exhaust volume flow rate flowing out of the shear exhaust outlet, the outlet pressure of the shear exhaust outlet, the liquid level of the slurry in the dissolver connected to the lower chute of the dissolver, the slurry temperature of the chute and the connecting device, the amount of nitrogen oxide gas generated in the dissolver, the dissolved exhaust volume flow rate flowing out of the dissolved exhaust outlet, the outlet pressure of the dissolved exhaust outlet, the exhaust density of the dissolved exhaust outlet and the pressure in the dissolver when the dissolver chute and the connecting device are in operation.

[0019] Optionally, according to the structural parameters and the operating parameters, simulating the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state to obtain the gas flow simulation result includes:

[0020] Establishing a three-dimensional geometric model of the dissolver chute and the connecting device according to the structural parameters;

[0021] Determine the air flow, temperature change and single-phase and phase change heat transfer simulation conditions of the dissolver chute and connecting devices;

[0022] The operating state of the three-dimensional geometric model under the simulation conditions and operating parameters is simulated to obtain a simulation result of the gas flow in the dissolver chute.

[0023] Optionally, determining an error of the gas flow simulation result includes:

[0024] Obtaining an actual shear exhaust volume flow rate flowing out of a shear exhaust outlet and an actual dissolved exhaust volume flow rate flowing out of a dissolved exhaust outlet when a dissolver chute and a connecting device of the target spent fuel reprocessing system are actually operated under the operating parameters;

[0025] The actual shear exhaust volume flow rate and the actual dissolved exhaust volume flow rate are compared with the simulated shear exhaust volume flow rate and the simulated dissolved exhaust volume flow rate in the gas flow simulation result to obtain an error in the gas flow simulation result.

[0026] Optionally, when the error is within a preset range, obtaining a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters includes:

[0027] When the error is within a preset range, the air flow, temperature change, and single-phase and phase-change heat transfer simulation conditions are determined as a simulation model under the structural parameters and operating parameters.

[0028] Optionally, the gas flow simulation method of the dissolver chute further includes:

[0029] When the error exceeds a preset range, adjusting the air flow, temperature change, and single-phase and phase change heat transfer simulation conditions;

[0030] According to the adjusted simulation conditions, the operating state of the target dissolver chute and the connecting device under the operating parameters and structural parameters is simulated to obtain a new gas flow simulation result;

[0031] The simulation model is obtained until the error of the new gas flow simulation result is within the preset range.

[0032] Optionally, the gas flow simulation method of the dissolver chute further includes:

[0033] Taking structural parameters of a dissolver chute and a connecting device of the target spent fuel reprocessing system as values ​​with a certain difference within a certain range, and obtaining structural parameters of the difference value;

[0034] The gas flow at the dissolver chute and the connecting device in the running state is simulated according to the structural parameters of the difference value, and the simulation model and gas flow simulation results under the structural parameters of the difference value are obtained.

[0035] The present invention also provides a gas flow simulation device for a dissolver chute, comprising:

[0036] An acquisition module, used to acquire structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute;

[0037] A processing module is used to determine the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation; simulate the gas flow at the chute of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation according to the structural parameters and the operating parameters to obtain a gas flow simulation result; determine the error of the gas flow simulation result; when the error is within a preset range, obtain a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and the operating parameters;

[0038] The simulation module is used to simulate and analyze the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system according to the simulation model to obtain the gas flow simulation result.

[0039] The present invention also provides a computing device, comprising: a processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method described above is executed.

[0040] The above solution of the present invention includes at least the following beneficial effects:

[0041] The above scheme of the present invention obtains the structural parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system, wherein the dissolver chute includes the dissolver upper chute and the dissolver lower chute; determines the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system when in operation; simulates the gas flow at the chute of the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state according to the structural parameters and the operating parameters, and obtains the gas flow simulation result; determines the error of the gas flow simulation result; when the error is within a preset range, obtains the simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and the operating parameters; according to the simulation model, simulates and analyzes the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system, and obtains the gas flow simulation result. The gas flow at the dissolver chute of the spent fuel reprocessing system can be simulated, thereby optimizing the structural parameters and the operating parameters of the chute, and improving the stability and economy of the operation of the head end of the spent fuel reprocessing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of a gas flow simulation method for a dissolver chute according to an embodiment of the present invention;

[0043] Figure 2 is an elevation view of a dissolver chute according to an embodiment of the present invention;

[0044] Figure 3 is a three-dimensional schematic diagram of a dissolver chute according to an embodiment of the present invention;

[0045] Figure 4 is a structural diagram of a gas flow simulation device for a dissolver chute according to an embodiment of the present invention;

[0046] Description of reference numerals:

[0047] 1. Shear short section and compressed air inlet; 2. End receiving device; 3. Square and round bucket; 4. Material distributor; 5. Dissolver upper chute; 6. Dissolver lower chute; 7. Leaching tower; 8. Dissolver exhaust outlet; 9. Shear exhaust outlet; 10. Leaching liquid inlet; 11. Liquid sealing device. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0049] like Figure 1As shown, an embodiment of the present invention provides a gas flow simulation method for a dissolver chute, comprising:

[0050] Step 11, obtaining structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute;

[0051] Here, the schematic diagram of the dissolver chute is as follows Figure 2 and Figure 3 As shown, the structural parameters include: the inner diameter D of the upper chute of the dissolver and the lower chute of the dissolver, the length l1 of the upper chute of the dissolver, the length l2 of the lower chute of the dissolver, the horizontal angle θ of the lower chute of the dissolver, the inner wall radius r1 of the shear exhaust outlet and the inner wall radius r2 of the dissolver exhaust outlet.

[0052] Step 12, determining the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system during operation;

[0053] Here, the operating parameters include: the air volume V of the compressed air flowing into the shear short section and the compressed air inlet 1; in , the shear exhaust volume flow rate V1 flowing out of the shear exhaust outlet 9, the outlet pressure p1 of the shear exhaust outlet 9, the liquid level L of the dissolver connected to the lower chute 6 of the dissolver, the liquid temperature T of the chute and the connecting device, the nitrogen oxide gas generation V in the dissolver NOX , the dissolved exhaust volume flow rate V2 flowing out of the dissolved exhaust outlet 8, the outlet pressure p2 of the dissolved exhaust outlet 8, the exhaust density ρ of the dissolved exhaust outlet 8 and the pressure p0 in the dissolver.

[0054] When the dissolver chute and connecting device of the target spent fuel reprocessing system are in actual operation, a certain flow of compressed air flows in from the shear short section and the compressed air inlet 1, and the air inlet volume V in . The compressed air flows through the end receiving device 2, and a part of the gas flows out of the system from the shear exhaust outlet 9. The outflow rate of the shear exhaust outlet 9 is the shear exhaust volume flow rate V1, and the outlet pressure of the shear exhaust outlet 9 is the shear exhaust pressure p1; the other part of the gas continues to flow through the square bucket 3, the distributor 4, the dissolver upper chute 5, the dissolver lower chute 6, and the leaching tower 7, and then flows out from the dissolver exhaust outlet 8 and enters the dissolver system. Below the dissolver lower chute 6 is the dissolver, and the dissolver is filled with liquid, and the liquid level is the dissolver liquid level height L. The temperature of the liquid in the dissolver chute and the connecting device at the head end of the spent fuel reprocessing is T; the liquid in the dissolver produces nitrogen oxide gas, and the amount of nitrogen oxide gas produced is V NOXAfter passing through the dissolver lower chute 6 and the leaching tower 7, the nitrogen oxide gas flows out from the dissolver exhaust outlet 8 together with a portion of the compressed air. The outflow rate of the dissolver exhaust outlet 8 is the dissolver exhaust volume flow rate V2, the outlet pressure of the dissolver exhaust outlet 8 is the dissolver exhaust pressure p2, the pressure in the dissolver is p0, and the exhaust density of the dissolver exhaust outlet 8 is ρ.

[0055] Step 13, simulating the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state according to the structural parameters and the operating parameters, and obtaining a gas flow simulation result;

[0056] Here, the operating states of the dissolver chute and the connecting device under the structural parameters and operating parameters are simulated in the simulation system to obtain the simulation results of the gas flow in the dissolver chute.

[0057] Step 14, determining an error of the gas flow simulation result;

[0058] Step 15, when the error is within a preset range, obtaining a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters;

[0059] Step 16: According to the simulation model, a simulation analysis is performed on the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system to obtain a gas flow simulation result.

[0060] In this embodiment, the gas flow in the dissolver chute and the connecting device of the target spent fuel reprocessing system is simulated and analyzed by establishing a simulation model, and the simulation results of the gas flow in the chute are obtained. The problem in the prior art that when the spent fuel reprocessing head-end processing system is in operation, there are a large amount of radioactive materials, and the airflow test research and phenomenon observation are very difficult, and it will consume a lot of manpower and material resources, increase economic costs and time costs. Through the simulation analysis method of the present invention, the simulation results of the gas flow in the dissolver chute can be accurately analyzed. Therefore, according to the gas flow simulation results, the structural parameters and operating parameters of the dissolver chute can be optimized to ensure the smooth flow of gas. And the risk problems existing in the current design and operation can be found in the actual production process, thereby improving the stability and economy of the spent fuel reprocessing head-end processing process.

[0061] In an optional embodiment of the present invention, step 13 may include:

[0062] Step 131, establishing a three-dimensional geometric model of the dissolver chute and the connecting device according to the structural parameters;

[0063] Step 132, determining the airflow, temperature change, and single-phase and phase change heat transfer simulation conditions of the dissolver chute and the connecting device;

[0064] Step 133, simulating the operating state of the three-dimensional geometric model under the simulation conditions and operating parameters to obtain a simulation result of the gas flow in the dissolver chute.

[0065] In this embodiment, the air flow, temperature change, and single-phase and phase change heat transfer simulation conditions in the simulation model are set; and a three-dimensional geometric model is established according to the structural parameters;

[0066] The simulation model operation parameters are set. When determining the dissolving exhaust pressure p2 in the operation parameters, the dissolver system pressure p0 and the dissolving exhaust volume flow rate V2 can be used to calculate the dissolver system pressure p0 and the dissolving exhaust volume flow rate V2. The calculation formula is:

[0067]

[0068] Based on the above-mentioned structural parameters, operating parameters and set simulation conditions, the flow of airflow at the chute under operating conditions is coupled with fluid mechanics and thermodynamics to obtain gas flow simulation results, which include: chute airflow velocity distribution, temperature distribution, pressure distribution and gas phase distribution results. The volume flow rate of the shear exhaust outlet 9 in the gas flow simulation results is recorded as V1', and the volume flow rate of the dissolved exhaust outlet 8 is recorded as V2'.

[0069] In an optional embodiment of the present invention, step 14 may include:

[0070] Step 141, obtaining an actual shear exhaust volume flow rate flowing out of a shear exhaust outlet and an actual dissolved exhaust volume flow rate flowing out of a dissolved exhaust outlet of a dissolver chute and a connecting device of the target spent fuel reprocessing system when the dissolver chute and the connecting device are actually operating under the operating parameters;

[0071] Step 142: compare the actual shear exhaust volume flow rate and the actual dissolved exhaust volume flow rate with the simulated shear exhaust volume flow rate and the simulated dissolved exhaust volume flow rate in the gas flow simulation result to obtain an error of the gas flow simulation result.

[0072] In this embodiment, the shear exhaust volume flow rate V1 and the dissolved exhaust volume flow rate V2 of the dissolver chute and the connecting device of the target spent fuel reprocessing system are obtained when the dissolver chute and the connecting device are actually operated under the operating parameters. V1 and V2 are compared with V1' and V2' to determine the maximum error between the two. The error ε is calculated as follows:

[0073]

[0074] In an optional embodiment of the present invention, step 15 may include:

[0075] Step 151, when the error is within a preset range, the air flow, temperature change and single-phase and phase change heat transfer simulation conditions are determined as a simulation model under the structural parameters and operating parameters.

[0076] In this embodiment, when the error ε is within a preset range, preferably, ε is less than or equal to 10%, then the model set in step 13 is the simulation model used for calculation within the operating condition range. The obtained simulation results of the chute gas flow velocity distribution, temperature distribution, pressure distribution and gas phase distribution are the simulation results of the gas flow in the chute of the head end dissolver of the spent fuel reprocessing under the working conditions.

[0077] In an optional embodiment of the present invention, the gas flow simulation method of the dissolver chute further includes:

[0078] Step 152, when the error exceeds a preset range, adjusting the air flow, temperature change, and single-phase and phase change heat transfer simulation conditions;

[0079] Step 153, simulating the operating state of the target dissolver chute and the connecting device under the operating parameters and structural parameters according to the adjusted simulation conditions to obtain a new gas flow simulation result;

[0080] Step 154 ​​, until the error of the new gas flow simulation result is within the preset range, a simulation model is obtained.

[0081] In this embodiment, when the error exceeds the preset range, preferably, the maximum error value ε is greater than 10%, the calculation model and simulation conditions of the airflow flow, temperature change, and single-phase and phase change heat transfer of the simulation model need to be adjusted, and the simulation and error calculation should be repeated until the maximum error value is within the preset range, so as to obtain the simulation model used for calculation under the operating conditions and the final result of the airflow analysis under the operating conditions.

[0082] In an optional embodiment of the present invention, the gas flow simulation method of the dissolver chute further includes:

[0083] Step 17, taking values ​​of structural parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system with a certain difference within a certain range to obtain structural parameters of the difference value;

[0084] Step 18, simulating the gas flow at the dissolver chute and the connecting device in the running state according to the structural parameters of the difference value, and obtaining the simulation model and gas flow simulation results under the structural parameters of the difference value.

[0085] In this embodiment, the structural parameters are taken with a certain difference within a certain range, and a finite element simulation model is established to perform simulation calculations to obtain the analysis results of the chute airflow velocity distribution, temperature distribution, pressure distribution and gas phase distribution within different structural parameter ranges.

[0086] The above method of the present invention simulates and analyzes the airflow condition of the dissolver chute at the head end of spent fuel reprocessing, and can find the airflow upward and nitrogen oxide flow abnormalities that exist in the current dissolver chute design and operation, optimize and improve the dissolver chute and connecting equipment, determine the equipment structure parameters and operating parameter ranges that can reduce or avoid airflow upward and nitrogen oxide flow abnormalities in the actual production process, and improve the safety and reliability of the head end processing system. Reduce the number of tests and commissioning in the actual operation production process, reduce economic costs and labor costs, and reduce the risk of personnel exposure. The present invention uses the finite element analysis method to carry out the gas flow state analysis of the dissolver chute at the head end of spent fuel reprocessing under a high radioactive environment, solves the problem of difficulty in conducting chute airflow flow tests and analysis in a high radioactive environment, provides a new analysis scheme for the safety analysis of chute airflow flow in a high radioactive environment, and provides technical support for the safe, stable and continuous operation of spent fuel reprocessing.

[0087] The dissolver chute device of the present invention comprises:

[0088] An upper dissolver chute 5 and a lower dissolver chute 6 connected to the upper dissolver chute 5;

[0089] A shearing device connected to the upper chute 5 of the dissolver via a liquid sealing device 11;

[0090] A dissolver connected to the dissolver lower chute 6;

[0091] A leaching tower 7 is also provided on the lower chute 6 of the dissolver, and a dissolving exhaust outlet 8 and a leaching liquid inlet 10 are vertically provided on the side wall of the leaching tower 7; wherein, the inner diameters of the upper chute 5 and the lower chute 6 of the dissolver are D, the length of the upper chute 5 of the dissolver is l1, the length of the lower chute 6 of the dissolver is l2, the horizontal angle of the lower chute 6 of the dissolver is θ, and the inner wall radius of the dissolving exhaust outlet 8 is r2.

[0092] Wherein, the shearing device comprises:

[0093] A distributor 4 connected to the liquid sealing device 11;

[0094] An end receiving device 2 connected to the distributor 4 via a square bucket 3;

[0095] The top opening of the end receiving device 2 is fixedly connected to the shear short section and the compressed air inlet 1, and a shear exhaust outlet 9 is provided on the side wall of the end receiving device 2, wherein the inner wall radius of the shear exhaust outlet 9 is r1.

[0096] like Figure 4 As shown, the present invention also provides a gas flow simulation device 40 for a dissolver chute, comprising:

[0097] An acquisition module 41 is used to acquire structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute;

[0098] The processing module 42 is used to determine the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation; simulate the gas flow at the chute of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation according to the structural parameters and the operating parameters to obtain a gas flow simulation result; determine the error of the gas flow simulation result; when the error is within a preset range, obtain a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and the operating parameters;

[0099] The simulation module 43 is used to perform simulation analysis on the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system according to the simulation model to obtain a gas flow simulation result.

[0100] Optionally, obtain the structural parameters of the dissolver chute and connecting device of the target spent fuel reprocessing system, including:

[0101] Obtain the inner diameters of the upper chute of the dissolver and the lower chute of the dissolver, the length of the upper chute of the dissolver, the length of the lower chute of the dissolver, the horizontal angle of the lower chute of the dissolver, the inner wall radius of the shear exhaust outlet, and the inner wall radius of the dissolver exhaust outlet.

[0102] Optionally, determining the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system during operation includes:

[0103] Determine the air intake volume of the compressed air flowing into the shear short section and the compressed air inlet, the shear exhaust volume flow rate flowing out of the shear exhaust outlet, the outlet pressure of the shear exhaust outlet, the liquid level of the slurry in the dissolver connected to the lower chute of the dissolver, the slurry temperature of the chute and the connecting device, the amount of nitrogen oxide gas generated in the dissolver, the dissolved exhaust volume flow rate flowing out of the dissolved exhaust outlet, the outlet pressure of the dissolved exhaust outlet, the exhaust density of the dissolved exhaust outlet and the pressure in the dissolver when the dissolver chute and the connecting device are in operation.

[0104] Optionally, according to the structural parameters and the operating parameters, simulating the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state to obtain the gas flow simulation result includes:

[0105] Establishing a three-dimensional geometric model of the dissolver chute and the connecting device according to the structural parameters;

[0106] Determine the air flow, temperature change and single-phase and phase change heat transfer simulation conditions of the dissolver chute and connecting devices;

[0107] The operating state of the three-dimensional geometric model under the simulation conditions and operating parameters is simulated to obtain a simulation result of the gas flow in the dissolver chute.

[0108] Optionally, determining an error of the gas flow simulation result includes:

[0109] Obtaining an actual shear exhaust volume flow rate flowing out of a shear exhaust outlet and an actual dissolved exhaust volume flow rate flowing out of a dissolved exhaust outlet when a dissolver chute and a connecting device of the target spent fuel reprocessing system are actually operated under the operating parameters;

[0110] The actual shear exhaust volume flow rate and the actual dissolved exhaust volume flow rate are compared with the simulated shear exhaust volume flow rate and the simulated dissolved exhaust volume flow rate in the gas flow simulation result to obtain an error in the gas flow simulation result.

[0111] Optionally, when the error is within a preset range, obtaining a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters includes:

[0112] When the error is within a preset range, the air flow, temperature change, and single-phase and phase-change heat transfer simulation conditions are determined as a simulation model under the structural parameters and operating parameters.

[0113] Optionally, the gas flow simulation method of the dissolver chute further includes:

[0114] When the error exceeds a preset range, adjusting the air flow, temperature change, and single-phase and phase change heat transfer simulation conditions;

[0115] According to the adjusted simulation conditions, the operating state of the target dissolver chute and the connecting device under the operating parameters and structural parameters is simulated to obtain a new gas flow simulation result;

[0116] The simulation model is obtained until the error of the new gas flow simulation result is within the preset range.

[0117] Optionally, the gas flow simulation method of the dissolver chute further includes:

[0118] Taking structural parameters of a dissolver chute and a connecting device of the target spent fuel reprocessing system as values ​​with a certain difference within a certain range, and obtaining structural parameters of the difference value;

[0119] The gas flow at the dissolver chute and the connecting device in the running state is simulated according to the structural parameters of the difference value, and the simulation model and gas flow simulation results under the structural parameters of the difference value are obtained.

[0120] It should be noted that the device is a device corresponding to the above method, and all implementation methods in the above method embodiments are applicable to the embodiments of the device and can achieve the same technical effects.

[0121] The present invention also provides a computing device, comprising: a processor, a memory storing a computer program, wherein when the computer program is executed by the processor, the method described above is executed. All implementations in the above method embodiment are applicable to this embodiment and can achieve the same technical effect.

[0122] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0124] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0127] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical disks.

[0128] In addition, it should be noted that in the apparatus and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. Moreover, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but it is not necessary to perform them in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it is understood that all or any steps or components of the method and apparatus of the present invention can be implemented in any computing device (including processors, storage media, etc.) or a network of computing devices in hardware, firmware, software or a combination thereof, which can be achieved by those of ordinary skill in the art using their basic programming skills after reading the description of the present invention.

[0129] Therefore, the purpose of the present invention can also be achieved by running a program or a group of programs on any computing device. The computing device can be a well-known general device. Therefore, the purpose of the present invention can also be achieved by simply providing a program product containing a program code that implements the method or device. That is to say, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future. It should also be pointed out that in the device and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. In addition, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but it is not necessary to perform them in chronological order. Some steps can be performed in parallel or independently of each other.

[0130] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for simulating gas flow in a dissolver chute, characterized in that: include: Acquire structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute; Determining operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system during operation; According to the structural parameters and the operating parameters, simulating the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state to obtain a gas flow simulation result; determining an error in the gas flow simulation result; When the error is within a preset range, a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters is obtained; According to the simulation model, a simulation analysis is performed on the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system to obtain a gas flow simulation result.

2. The gas flow simulation method of a dissolver chute according to claim 1, characterized in that: Obtain the structural parameters of the dissolver chute and connecting device of the target spent fuel reprocessing system, including: Obtain the inner diameters of the upper chute of the dissolver and the lower chute of the dissolver, the length of the upper chute of the dissolver, the length of the lower chute of the dissolver, the horizontal angle of the lower chute of the dissolver, the inner wall radius of the shear exhaust outlet, and the inner wall radius of the dissolver exhaust outlet.

3. The gas flow simulation method of a dissolver chute according to claim 1, characterized in that: Determining the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system during operation, including: Determine the air intake volume of the compressed air flowing into the shear short section and the compressed air inlet, the shear exhaust volume flow rate flowing out of the shear exhaust outlet, the outlet pressure of the shear exhaust outlet, the liquid level of the slurry in the dissolver connected to the lower chute of the dissolver, the slurry temperature of the chute and the connecting device, the amount of nitrogen oxide gas generated in the dissolver, the dissolved exhaust volume flow rate flowing out of the dissolved exhaust outlet, the outlet pressure of the dissolved exhaust outlet, the exhaust density of the dissolved exhaust outlet and the pressure in the dissolver when the dissolver chute and the connecting device are in operation.

4. The gas flow simulation method of a dissolver chute according to claim 1, characterized in that: According to the structural parameters and the operating parameters, the gas flow at the dissolver chute and the connecting device of the target spent fuel reprocessing system in the operating state is simulated to obtain the gas flow simulation results, including: Establishing a three-dimensional geometric model of the dissolver chute and the connecting device according to the structural parameters; Determine the air flow, temperature change and single-phase and phase change heat transfer simulation conditions of the dissolver chute and connecting devices; The operating state of the three-dimensional geometric model under the simulation conditions and operating parameters is simulated to obtain a simulation result of the gas flow in the dissolver chute.

5. The gas flow simulation method of a dissolver chute according to claim 1, characterized in that: Determining an error of the gas flow simulation result includes: Obtaining an actual shear exhaust volume flow rate flowing out of a shear exhaust outlet and an actual dissolved exhaust volume flow rate flowing out of a dissolved exhaust outlet when a dissolver chute and a connecting device of the target spent fuel reprocessing system are actually operated under the operating parameters; The actual shear exhaust volume flow rate and the actual dissolved exhaust volume flow rate are compared with the simulated shear exhaust volume flow rate and the simulated dissolved exhaust volume flow rate in the gas flow simulation result to obtain an error in the gas flow simulation result.

6. The gas flow simulation method of a dissolver chute according to claim 4, characterized in that: When the error is within a preset range, a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and operating parameters is obtained, including: When the error is within a preset range, the air flow, temperature change, and single-phase and phase-change heat transfer simulation conditions are determined as a simulation model under the structural parameters and operating parameters.

7. The gas flow simulation method of a dissolver chute according to claim 6, characterized in that: Also includes: When the error exceeds a preset range, adjusting the air flow, temperature change, and single-phase and phase change heat transfer simulation conditions; According to the adjusted simulation conditions, the operating state of the target dissolver chute and the connecting device under the operating parameters and structural parameters is simulated to obtain a new gas flow simulation result; The simulation model is obtained until the error of the new gas flow simulation result is within the preset range.

8. The gas flow simulation method of a dissolver chute according to claim 1, characterized in that: Also includes: Taking structural parameters of a dissolver chute and a connecting device of the target spent fuel reprocessing system as values ​​with a certain difference within a certain range, and obtaining structural parameters of the difference value; The gas flow at the dissolver chute and the connecting device in the running state is simulated according to the structural parameters of the difference value, and the simulation model and gas flow simulation results under the structural parameters of the difference value are obtained.

9. A gas flow simulation device for a dissolver chute, characterized in that: include: An acquisition module, used to acquire structural parameters of a dissolver chute and a connecting device of a target spent fuel reprocessing system, wherein the dissolver chute includes an upper dissolver chute and a lower dissolver chute; A processing module is used to determine the operating parameters of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation; simulate the gas flow at the chute of the dissolver chute and the connecting device of the target spent fuel reprocessing system when they are in operation according to the structural parameters and the operating parameters to obtain a gas flow simulation result; determine the error of the gas flow simulation result; when the error is within a preset range, obtain a simulation model of the dissolver chute and the connecting device of the target spent fuel reprocessing system under the structural parameters and the operating parameters; The simulation module is used to simulate and analyze the gas flow of the dissolver chute and the connecting device of the target spent fuel reprocessing system according to the simulation model to obtain the gas flow simulation result.

10. A computing device, characterized in that include: A processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method according to any one of claims 1 to 8 is performed.

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