Method for determining structure of pipeline connecting device and pipeline connecting device
By acquiring the operating parameters and three-dimensional model of the pipeline connection device for numerical simulation, particle size and velocity distribution cloud maps are generated, the pipeline structure is optimized, and the problem of solid particulate matter affecting equipment operation in uranium enrichment plants is solved, thereby reducing deposition and improving stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT NUCLEAR URANIUM ENRICHMENT
- Filing Date
- 2025-12-31
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, during the low-temperature and low-pressure feeding process in uranium enrichment plants, solid particles enter pipelines and equipment, leading to a decline in equipment performance, reduced heat exchange efficiency, and even malfunctions and safety hazards, as well as causing economic losses.
By acquiring the operating parameters and 3D model of the pipeline connection device, numerical simulation is performed to generate particle size and velocity distribution cloud maps, determine whether the device meets the design requirements, and optimize the pipeline structure to reduce solid particle deposition.
It effectively reduces the deposition of solid particles in pipelines and equipment, slows down the decline in the separation capacity of cascade systems, reduces maintenance costs, and improves operational stability.
Smart Images
Figure CN121997809A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of uranium enrichment technology, specifically relating to a method for determining the structure of a pipeline connection device and the pipeline connection device itself. Background Technology
[0002] Currently, uranium enrichment plants employ a low-temperature, low-pressure feeding method. By heating the feeding container, the solid UF6 within it continuously sublimates. During this process, non-volatile solid particles accompany the UF6 gas flow into the cascade system. Although feed filters are installed after the feeding container to prevent the entry of solid particles from the feedstock, a small number of tiny particles still remain. These particles are continuously carried by the gas flow into the next stage of process pipelines and equipment, reducing equipment performance, affecting heat exchange efficiency, and even causing malfunctions and safety hazards. Furthermore, the friction and impact of these particles cause erosion effects on the inner walls of equipment, resulting in economic losses for the company. In the aforementioned pneumatic conveying system, collisions occur between solid particles and the inner walls of pipelines and equipment, as well as collisions between particles themselves. Under the influence of gravity, particle aggregation or deposition inevitably occurs within the pipelines, which can severely affect gas transport within the pipelines or equipment. Summary of the Invention
[0003] The purpose of this application is to provide a method for determining the structure of a pipeline connection device and a pipeline connection device, thereby solving the problem in the prior art where solid particles in raw materials affect gas transport in pipelines or equipment.
[0004] The technical solution to achieve the purpose of this application is as follows:
[0005] The first aspect of this application provides a method for determining the structure of a pipe connection device, the method comprising:
[0006] Obtain the operating parameters and three-dimensional model of the target pipeline connection device; the operating parameters include: pipeline internal pressure and flow velocity;
[0007] Numerical simulation was performed using the operating parameters and the three-dimensional model to obtain a particle size and velocity distribution cloud map of the target pipe connection device.
[0008] Based on the particle size and velocity distribution cloud map, determine whether the target pipe connection device meets the pipe design requirements.
[0009] Optionally, the numerical simulation using the operating parameters and the three-dimensional model specifically includes:
[0010] Based on the Euler-Lagrange method, the motion of the continuous phase fluid is described using the Euler method, while the motion of the discrete phase particles is described using the Lagrange method.
[0011] Optionally, when establishing the three-dimensional model, the length of the inlet pipe is increased to ensure that the conditions for full development of the gas-solid two phases are met, and the boundary layer region between the gas-solid phase and the wall is densified by increasing the length of the inlet pipe to ensure that the conditions for full development of the gas-solid two phases are met.
[0012] Optionally, the length of both the inlet and outlet pipes of the material phase can be set to 1000 mm.
[0013] Optionally, the target pipe connection device is a pipe diameter enlargement section, a 90-degree arc bend, or a T-shaped pipe.
[0014] Optionally, when the target pipe connection device is a T-shaped pipe, it meets the pipe design requirements.
[0015] The second aspect of this application provides a pipe connection device, the structure of which is determined according to any one of the methods for determining the structure of the pipe connection device provided in the first aspect of this application.
[0016] Optionally, the pipe connection device is a T-shaped pipe.
[0017] Optionally, the inlet pipe of the T-shaped pipe has a length of 1000mm, an outlet pipe length of 1065mm, a residual pipe length of 200mm, and a pipe diameter of 65mm.
[0018] Optionally, the T-tube is installed after the feed filter of the feeding system.
[0019] The beneficial technical effects of this application are as follows:
[0020] This application provides a method for determining the structure of a pipeline connection device and a pipeline connection device. The method includes: acquiring the operating parameters and a three-dimensional model of the target pipeline connection device; the operating parameters include: pipeline internal pressure and flow velocity; performing numerical simulation using the operating parameters and the three-dimensional model to obtain a particle size and velocity distribution cloud map of the target pipeline connection device; and determining whether the target pipeline connection device meets the pipeline design requirements based on the particle size and velocity distribution cloud map. This application, by constructing a three-dimensional pipeline model and using the model for numerical simulation, analyzes the influence of different gas phase velocities and pipeline clearance lengths on particle deposition, and proposes an optimal pipeline design scheme by considering factors such as pipeline laying costs and plant space utilization. This application can deposit solid impurities during operation, reduce the content of solid deposits within the cascade, and slow down the decline in the separation capacity of the cascade system. Attached Figure Description
[0021] Figure 1 A flowchart illustrating a method for determining the structure of a pipe connection device, provided in an embodiment of this application;
[0022] Figure 2 This is a schematic diagram of a pipe connection device provided in an embodiment of this application;
[0023] Figure 3 This application provides a cloud map showing the particle size and velocity distribution of a pipe connection device under different residual lengths, as part of a specific embodiment. Detailed Implementation
[0024] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0025] See Figure 1 The figure is a flowchart illustrating a method for determining the structure of a pipe connection device according to an embodiment of this application.
[0026] This application provides a method for determining the structure of a pipe connection device, characterized in that the method includes:
[0027] Step S101: Obtain the operating parameters and three-dimensional model of the target pipeline connection device; the operating parameters include: pipeline internal pressure and flow velocity;
[0028] Step S102: Perform numerical simulation using the working parameters and the three-dimensional model to obtain the particle size and velocity distribution cloud map of the target pipe connection device;
[0029] Step S103: Based on the particle size and velocity distribution cloud map, determine whether the target pipe connection device meets the pipe design requirements.
[0030] In this embodiment, a three-dimensional pipeline model can be established using Solidworks software based on parameters such as pressure and flow velocity of the feed flow pipeline. A preliminary design scheme for the pipeline connection section can be generated, and numerical simulation using a CFD-DPM model can be performed to obtain theoretical results, namely, the particle size and velocity distribution cloud map of the scheme. After optimization, the optimal design scheme is obtained, thereby reducing the content of solid particle deposits in the uranium enrichment cascade feed flow and slowing down the decline in the separation capacity of the cascade system. During the design process, parameters such as particle diameter and density of solid impurities can be determined based on parameters such as pressure and flow velocity of the feed flow pipeline.
[0031] In one example, the piping design requirements could be:
[0032] ①The solid impurity deposition rate of a single pipe connection section is >15%;
[0033] ② Service life > 5 years, or pressure difference increase ≤ 300Pa within the short-term assessment period;
[0034] ③ The vacuum sealing degree meets the requirements.
[0035] By simulating the flow state of gas and particles in the expansion section, the structural parameters that result in "reduced flow velocity and highest particle settling efficiency" can be found, thus avoiding blind design.
[0036] In practical applications, the model can be meshed using ICEM software with a structured mesh, employing hexahedral meshing to ensure that the mesh quality is greater than 0.6.
[0037] In specific implementation, the numerical simulation using the working parameters and the three-dimensional model may include:
[0038] Based on the Eulerian-Lagrange method, the motion of the continuous phase fluid was described using the Eulerian method, while the motion of the discrete phase particles was described using the Lagrange method. The deposition process of solid phase particles was numerically simulated.
[0039] In one example, due to the intense interaction between the gas and solid phases in the central region of the pipeline, and the significant velocity variations of the gas and solid phases, the length of the inlet pipeline can be increased during the creation of the 3D model to ensure sufficient development of the gas and solid phases. The pipeline is increased in size from the pipe wall to the central region by a scaling factor of 1.2. To accurately simulate the boundary layer effect within the pipeline, the boundary layer region between the gas and solid phases and the pipe wall is densified.
[0040] As an example, the length of both the inlet and outlet pipes can be set to 1000mm.
[0041] In some possible implementations of the embodiments of this application, the target pipe connection device may be a pipe diameter enlargement section, a 90-degree arc bend, or a T-shaped pipe.
[0042] In practical implementation, the same boundary conditions can be used, with a gas inlet velocity of 10 m / s, to calculate models with different grid numbers. Based on the calculation results, comparing the particle size distribution cloud maps of the three models at the same gas velocity, the particle distribution within the 90-degree curved bend is relatively dispersed, without particle aggregation or deposition. When solid particles pass through the T-tube, considering factors such as plant space, a residual length of 200 mm is chosen. When the gas velocity is low, small-diameter particles have less inertial force and flow out of the pipe with the gas, while large-diameter particles, due to greater inertial force and a more significant gravitational effect, remain in the pipe residual length. Analysis shows that the deposited particles at the pipe residual length are mainly large particles. Solid particles significantly deposit at the small-diameter section of the pipe after passing through the pipe diameter expansion section, exhibiting a certain radial distribution.
[0043] Therefore, in one example, when the target pipe connection device is a T-shaped pipe, it meets the pipe design requirements, significantly reduces the deposition of impurities in the orifice plate, pipe and other locations in the production line, reduces maintenance operations such as replacing orifice plates by operators, reduces maintenance costs, and improves operational stability.
[0044] Based on the method for determining the structure of a pipe connection device provided in the above embodiments, this application also provides a pipe connection device.
[0045] See Figure 2 The figure is a schematic diagram of a pipe connection device provided in an embodiment of this application.
[0046] The present application provides a pipe connection device whose structure is determined according to any one of the methods for determining the structure of the pipe connection device provided in the above embodiments.
[0047] In some possible implementations of the embodiments of this application, the pipe connection device can be a T-shaped pipe.
[0048] In one example, the inlet pipe of the T-shaped pipe is 1000mm long, the outlet pipe is 1065mm long, the remaining pipe is 200mm long, and the pipe diameter is 65mm.
[0049] Figure 3 Examples are shown in the particle size and velocity distribution cloud maps for different residual lengths of the T-shaped tube.
[0050] In another example, the T-tube can be installed after the feed filter of the feeding system.
[0051] The embodiments provided in this application will be explained in detail below with reference to a specific example.
[0052] The embodiments provided in this application
[0053] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.
Claims
1. A method for determining the structure of a pipe connection device, characterized in that, The method includes: Obtain the operating parameters and three-dimensional model of the target pipeline connection device; the operating parameters include: pipeline internal pressure and flow velocity; Numerical simulation was performed using the operating parameters and the three-dimensional model to obtain a particle size and velocity distribution cloud map of the target pipe connection device. Based on the particle size and velocity distribution cloud map, determine whether the target pipe connection device meets the pipe design requirements.
2. The method for determining the structure of a pipe connection device according to claim 1, characterized in that, The numerical simulation using the operating parameters and the three-dimensional model specifically includes: Based on the Euler-Lagrange method, the motion of the continuous phase fluid is described using the Euler method, while the motion of the discrete phase particles is described using the Lagrange method.
3. The method for determining the structure of a pipe connection device according to claim 1, characterized in that, When the three-dimensional model is established, the length of the inlet pipe is increased to ensure that the conditions for full development of the gas-solid two phases are met. The pipe wall is increased by a scaling factor of 1.2 from the central region to the central region, and the boundary layer region between the gas-solid phase and the wall is densified.
4. The method for determining the structure of a pipe connection device according to claim 3, characterized in that, The inlet and outlet pipes for the material phase are both 1000mm in length.
5. The method for determining the structure of a pipe connection device according to any one of claims 1-4, characterized in that, The target pipe connection device is an enlarged pipe section, a 90-degree arc bend, or a T-shaped pipe.
6. The method for determining the structure of a pipe connection device according to claim 5, characterized in that, When the target pipe connection device is a T-shaped pipe, it meets the pipe design requirements.
7. A pipe connection device, characterized in that, Its structure is determined by the method for determining the structure of the pipe connection device according to any one of claims 1-6.
8. The pipe connection device according to claim 7, characterized in that, The pipe connection device is a T-shaped pipe.
9. The pipe connection device according to claim 8, characterized in that, The T-shaped pipe has an inlet pipe length of 1000mm, an outlet pipe length of 1065mm, a remaining pipe length of 200mm, and a pipe diameter of 65mm.
10. The pipe connection device according to claim 8, characterized in that, The T-tube is installed after the feed filter of the feeding system.