Pipeline transportation straight pipe deceleration design method and system
By establishing a three-dimensional solid model of the pipeline and a discrete element simulation model of the waste slag, the deceleration structure parameters were optimized, and the problems of unclear speed distribution and high testing costs in the design of long and steep slope pipeline transportation were solved, achieving safe and efficient pipeline design and extending its service life.
Patent Information
- Application Number
- CN202510932078.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-07
- Publication Date
- 2025-10-17
AI Technical Summary
现有长大坡道管道运输设计方法无法准确获得不同坡度下弃渣的速度分布，试验次数多且花费巨大，导致管道系统存在"过设计"或"欠设计"风险，增加建设成本并可能导致运行期间频繁爆管。
A straight pipe deceleration design method for pipeline transportation is adopted. By establishing a three-dimensional pipeline solid model and a waste slag discrete element simulation model, the waste slag transportation situation is simulated in combination with the discrete element dynamics method, the deceleration structure parameters are optimized, the waste slag velocity distribution and wear conditions are obtained, and the optimal deceleration structure is determined.
It achieves accurate design of the deceleration structure of long and steep slope pipelines, reduces test costs, improves design accuracy and safety, extends pipeline service life, and reduces construction costs.
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Figure CN120805625A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pipeline transportation design, and in particular relates to a pipeline transportation straight pipe deceleration design method and system. BACKGROUND
[0002] In mountainous railway engineering construction, efficient transportation of spoil is a key link affecting project progress, cost and ecological environment. Spoil transportation mostly relies on traditional highway transportation, which faces a series of problems such as large land occupation, high energy consumption, long construction period, low transportation safety, large vegetation destruction and large river water pollution. The pipeline transportation method can better solve these problems.
[0003] As a replacement solution, pipeline transportation technology can effectively avoid the above problems, but there are still some bottlenecks in actual application, especially in the transportation scene of long and large slopes (slope > 15°, length > 500m). The spoil in the pipeline is accelerated by gravity and forms a high-speed motion state, which causes three major problems: first, the high-speed spoil (speed up to 8-15m / s) will produce a severe impact load, and the instantaneous impact force can reach 3-5 times the static load, which can easily cause local deformation of the pipe wall or cracking of the weld; second, the continuous friction between the spoil and the pipe wall will cause the wear rate to increase exponentially, and the annual wear of the pipe wall at the key bend position can exceed 10mm, greatly reducing the service life of the pipeline; third, the existing design method lacks precise control of the multiphase flow (solid-liquid-gas) motion state, making it difficult to balance the contradiction between transportation efficiency and equipment durability.
[0004] In order to reduce the speed of the spoil and reduce the wear of the pipeline, a deceleration structure is arranged in the pipeline. The current pipeline design method generally relies on field tests to determine the arrangement scheme of the deceleration structure. This method has three disadvantages: (1) it is not possible to accurately obtain the global velocity distribution data of the pipeline under different slopes, and only indirect inference can be made through limited measurement points, resulting in unclear spoil velocity field and pressure field distribution at key positions such as slope change sections and bend connections; (2) the test results are difficult to extrapolate, and different particle size ratios (such as d50=20mm and d50=50mm) and different slopes (25° and 30°) require repeated tests, which is time-consuming and lacks universal theoretical guidance; (3) the test cost is high, and a single full-size test can cost up to one million yuan. This directly causes the pipeline system to have the risk of "overdesign" or "underdesign", increasing the construction cost by more than 30%, and may also cause frequent pipe bursts during operation, increasing the accident rate. SUMMARY
[0005] The application aims to solve the problem that the existing long and large slope pipeline transportation design method cannot accurately obtain the speed distribution of the rejected slag under different slopes, and the problem of a large number of tests and huge cost, and provides a pipeline transportation straight pipe deceleration design method and system.
[0006] In the first aspect, the application provides a pipeline transportation straight pipe deceleration design method, which comprises the following steps: Step S1, establishing a pipeline three-dimensional entity model of pipeline transportation; based on the physical property parameters of the rejected slag, a pipeline transportation rejected slag discrete element simulation model is established in combination with the pipeline three-dimensional entity model; Step S2, determining the pipeline transportation capacity and the rejected slag feeding speed, and simulating the rejected slag transportation condition by using the pipeline transportation rejected slag discrete element simulation model; Step S3, optimizing and designing the deceleration structure parameters of the pipeline according to the simulation result to obtain the optimal deceleration structure parameters.
[0007] In the technical scheme of the application, the pipeline three-dimensional entity model is first established, the pipeline transportation rejected slag discrete element simulation model is established in combination with the physical property parameters of the rejected slag, the deceleration structure of the pipeline is simulated based on the discrete element dynamics method considering the field pipeline transportation capacity and the rejected slag feeding speed control requirement, the speed distribution of the pipeline in-pipe rejected slag and the abrasion condition of the rejected slag to the pipeline are obtained, and the deceleration structure parameters of the pipeline are optimized and designed according to the simulation result to determine the setting parameters of the deceleration structure under the speed control range and the abrasion.
[0008] In the above technical scheme, the application is aimed at the design of the long and large slope pipeline deceleration structure, especially the straight pipe, and the method can more accurately and comprehensively obtain the speed distribution of the rejected slag in the straight pipe, the force and the abrasion condition of the rejected slag to the pipeline compared with the field test method, is safer, and costs less.
[0009] As a preferred scheme of the application, the method for determining the physical property parameters of the rejected slag is as follows: The lithology, particle size, particle size composition, bulk density and physical and mechanical parameters of the rejected slag are obtained; The inter-particle friction coefficient of the rejected slag and the friction coefficient between the rejected slag and the pipeline are measured according to the lithology, particle size, particle size composition and bulk density of the rejected slag; The physical and mechanical parameters of the rejected slag are calibrated according to the measured inter-particle friction coefficient of the rejected slag and the friction coefficient between the rejected slag and the pipeline, and the physical property parameters of the rejected slag are updated. In the above technical scheme, the physical property parameters of the rejected slag of the pipeline transportation are determined, the inter-particle friction coefficient of the rejected slag and the friction coefficient between the rejected slag and the pipeline are determined through field experiments, and the physical property parameters of the rejected slag are calibrated.
[0010] As a preferred embodiment of the present invention, the friction coefficient between the waste slag particles is calculated by using the fixed funnel method, and the steps are as follows: The waste particles are selected according to the lithology, particle size and particle size composition, and bulk density of the waste; Slowly pouring the waste particles through a funnel onto a horizontal surface to form a cone; Measure the height and base radius of the cone; The angle of repose of the waste slag is calculated, and the friction coefficient between the waste slag particles is obtained based on the angle of repose.
[0011] As a preferred embodiment of the present invention, the friction coefficient between the waste slag and the pipeline is calculated by using the inclined pipeline sliding method, and the steps are as follows: The waste particles are selected according to the lithology, particle size and particle size composition, and bulk density of the waste; Cutting a section of an experimental pipeline identical to an actual conveying pipeline, fixing the experimental pipeline horizontally, and laying a layer of the waste slag particles flatly inside the experimental pipeline; Gradually increase the inclination of the experimental pipe and record it until the waste slag particles begin to slide as a whole. The inclination at this time is used as the pipe wall friction angle. Use an inclinometer to measure the pipe inclination. The friction coefficient between the waste slag and the pipeline is calculated based on the pipeline wall friction angle.
[0012] As a preferred embodiment of the present invention, the method for establishing the discrete element simulation model of pipeline transportation waste slag is: using discrete element simulation software EDEM, importing the pipeline three-dimensional solid model into EDEM as a template, setting parameters according to the physical property parameters of the waste slag, and establishing the discrete element simulation model of pipeline transportation waste slag.
[0013] As a preferred solution of the present invention, the deceleration structural parameters of the pipeline include quantity, installation position, and structural design parameters.
[0014] As a preferred embodiment of the present invention, the detailed steps of step S3 are as follows: according to the simulation results, the velocity distribution of the waste slag and the pipeline wear depth are obtained, and it is determined whether the waste slag velocity control range at the pipeline outlet and the designed pipeline wear depth are met; if not, the waste slag velocity control range at the pipeline outlet and the pipeline wear are used as optimization targets, and the pipeline deceleration structure parameters are changed to design pipelines with different deceleration working conditions, and simulation is performed according to steps S1 to S2 to obtain the optimal deceleration structure parameters of the pipeline while meeting the optimization targets.
[0015] As a preferred embodiment of the present invention, in the simulation, the calculation formula for the translational velocity of the waste slag is:
[0016] in: is the particle velocity vector at time t, in m / s; is the feeding speed, in m / s; is the resultant external force on the particle, including contact force, body force and damping force, in N; m is the mass of the particle, in kg.
[0017] As a preferred scheme of the present application, the pipeline wear depth is calculated by using the Archard wear model, and the calculation formula is:
[0018] In the formula, is the pipeline wear depth, is the wear factor, is the Vickers hardness, is the normal contact force, is the sliding distance of the refuse in the contact state, is the geometric unit area of the pipeline, wherein the wear factor and the Vickers hardness are determined by the actual materials used by the pipeline.
[0019] As a preferred scheme of the present application, after the optimal deceleration structure parameters are determined in step S3, the wear degrees of different regions of the pipeline provided with the optimal deceleration structure parameters are obtained, and the maximum wear rate is determined, which is used to provide a basis for estimating the service life of the pipeline.
[0020] As a preferred scheme of the present application, after the optimal deceleration structure parameters are determined in step S3, the stress distribution of different regions of the pipeline provided with the optimal deceleration structure parameters is obtained, and the overall stress of the pipeline is determined, which is used to provide a basis for determining the design load of the pipeline.
[0021] In a second aspect, the present application provides a pipeline transportation straight pipe deceleration design system, which comprises: A model establishing module is configured to establish a pipeline three-dimensional entity model of pipeline transportation, and establish a pipeline transportation refuse discrete element simulation model based on the physical property parameters of the refuse and the pipeline three-dimensional entity model; A simulation module is configured to determine the pipeline transportation capacity and the refuse feeding speed, and simulate the refuse transportation condition by using the pipeline transportation refuse discrete element simulation model; An analysis module is configured to optimize the design of the deceleration structure parameters of the pipeline according to the simulation result, and obtain the optimal deceleration structure parameters.
[0022] The present application further provides an electronic device comprising at least one processor and a memory connected with the at least one processor in communication; the memory stores instructions executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the above-mentioned pipeline transportation straight pipe deceleration design method.
[0023] Compared with the prior art, the present application has the beneficial effects of: 1. The present application provides a pipeline transportation straight pipe deceleration design method, which is based on the discrete element dynamics method, simulates the spoil transportation condition of the deceleration structure of the pipeline, obtains the speed distribution of the spoil in the pipeline and the wear condition of the spoil on the pipeline, optimizes the design of the deceleration structure parameters of the pipeline according to the simulation results, determines the optimal deceleration structure parameters under the speed control range and wear, is suitable for the design of the deceleration structure of the long and large slope pipeline, can realize the "digital twin" of the pipeline transportation system, and forms an intelligent design method considering the pipeline transportation efficiency and the service life of the pipeline.
[0024] 2. The deceleration design method provided by the present application clearly defines the setting parameters of the deceleration structure in the pipeline, clearly defines the stress distribution condition of the spoil on the pipeline, provides a basis for determining the design load, and clearly defines the wear degree and wear speed of the pipeline and the deceleration structure on the basis of reasonable speed control and deceleration structure setting, and provides a reference for the service life of the structure. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is a pipeline transportation straight pipe deceleration design method flowchart of the present application; Figure 2 It is a sectional view of the pipeline three-dimensional entity model in Example 1; Figure 3 It is a process diagram of testing the friction coefficient between spoil particles by using a fixed funnel method in Example 1; Figure 4 It is a rest angle measurement schematic diagram in Example 1; Figure 5 It is a speed extraction segmentation diagram of the spoil discrete element simulation model simulation in Example 1; Figure 6 It is a spoil speed distribution curve of working conditions 1-1 to 1-4 in Example 1; Figure 7 It is a different arrangement schematic diagram of the deceleration structure in the pipeline in Example 1; Figure 8 It is a structure schematic diagram of the deceleration structure in Example 1; Figure 9 It is a spoil speed distribution curve of working conditions 2-1 to 2-4 in Example 1; Figure 10 It is a wear depth curve of the pipe body in Example 1; Figure 11 It is a wear depth curve of the baffle in Example 1. DETAILED DESCRIPTION
[0026] The application will be described in further detail below with reference to the embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the application is limited to the following embodiments, and any technology achieved based on the content of the application falls within the scope of the application.
[0027] In the description of the embodiments of the application, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer" and the like are expressed based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product / device / apparatus of the application is usually placed. These terms of orientation or position relationship are only for the convenience of describing the application scheme or simplifying the description in the embodiments, and for the convenience of the technical personnel to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the application.
[0028] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel", "coaxial" and the like appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel or coaxial, but can be slightly inclined or have a deviation, as long as it does not affect the normal function of the related component. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined; "coaxial" means that two components are arranged as coaxial as possible, and are moved in a coaxial or approximately coaxial manner when the relative position changes. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the "horizontal", "vertical", "overhanging", "parallel", "coaxial" direction, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the application scheme.
[0029] In addition, the terms "first", "second", "third" and the like appearing in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.
[0030] In addition, in the description of the embodiments of the application, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, and even more than 9.
[0031] Furthermore, in the description of the technical solutions of the present application, unless otherwise explicitly specified / limited / limited, the terms "arrangement", "installation", "connection", "connection", "provided with", "laid", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, which can be welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication between two elements.
[0032] The present disclosure provides a pipeline transportation straight pipe deceleration design method, as shown in Figure 1 The method comprises the following steps: Step S1, establishing a three-dimensional entity model of the pipeline for pipeline transportation; based on the physical property parameters of the waste residue, a discrete element simulation model of the waste residue for pipeline transportation is established in combination with the three-dimensional entity model of the pipeline; Step S2, determining the pipeline transportation capacity and the waste residue feeding speed, and simulating the waste residue transportation condition by using the discrete element simulation model of the waste residue for pipeline transportation; Step S3, optimizing the deceleration structure parameters of the pipeline according to the simulation results to obtain the optimal deceleration structure parameters.
[0033] First, a three-dimensional entity model of the pipeline is established according to the pipeline structure and the deceleration structure inside the pipeline, and a waste residue entity model is established according to the material characteristics of the waste residue particles. The established three-dimensional entity model of the pipeline and the waste residue entity model are saved in the required format to prepare for data transmission.
[0034] In some embodiments, the method for determining the physical property parameters of the waste residue is: The lithology, particle size and particle size composition, bulk density, and physical and mechanical parameters of the waste residue are obtained; the physical and mechanical parameters include true density, static angle of repose, friction coefficient, moisture content, and hardness; The inter-particle friction coefficient of the waste residue and the friction coefficient between the waste residue and the pipeline are measured according to the lithology, particle size and particle size composition, and bulk density of the waste residue; The physical and mechanical parameters of the waste residue are calibrated according to the measured inter-particle friction coefficient of the waste residue and the friction coefficient between the waste residue and the pipeline, and the physical property parameters of the waste residue are updated.
[0035] The inter-particle friction coefficient of the waste residue is calculated after being tested by the fixed funnel method, and the steps are: The waste residue particles are selected according to the lithology, particle size and particle size composition, and bulk density of the waste residue; The waste residue particles are slowly poured through the funnel onto the horizontal surface to form a conical body; The height and bottom radius of the conical body are measured; The repose angle of the discarded slag is calculated, and the friction coefficient between the discarded slag particles is obtained according to the repose angle, and the calculation formula of the repose angle is
[0036] The calculation formula of the friction coefficient between the discarded slag particles is
[0037] In the formula, is the repose angle, h is the height of the cone, r is the radius of the bottom of the cone, is the friction coefficient between the discarded slag particles.
[0038] The friction coefficient between the discarded slag and the pipeline is calculated after being tested by the inclined pipeline sliding method, and the steps are as follows: The discarded slag particles are selected according to the lithology, particle size, particle size composition and bulk density of the discarded slag; A section of the experimental pipeline which is the same as the actual conveying pipeline is cut off, the experimental pipeline is fixed horizontally, and a layer of discarded slag particles is laid in the experimental pipeline; The inclination angle of the experimental pipeline is gradually increased and recorded until the discarded slag particles begin to slide as a whole, and the inclination angle at this time is taken as the pipeline wall friction angle; the inclination angle of the pipeline is measured by using an angle meter The friction coefficient between the discarded slag and the pipeline is calculated according to the pipeline wall friction angle, and the calculation formula of the friction coefficient between the discarded slag and the pipeline is as follows:
[0039] In the formula, is the friction coefficient between the discarded slag and the pipeline, is the pipeline wall friction angle.
[0040] In some embodiments, the discrete element dynamics method is realized based on EDEM (multi-purpose discrete element method modeling) software, and the establishment method of the discrete element simulation model of the pipeline transported discarded slag is as follows: the discrete element simulation software EDEM is used, the three-dimensional entity model of the pipeline is imported into EDEM as a template, the above-mentioned established waste slag entity model is combined, the parameters are set according to the physical property parameters of the discarded slag, and the discrete element simulation model of the pipeline transported discarded slag is established.
[0041] In some embodiments, the detailed steps of step S3 are as follows: according to the simulation results, the velocity distribution of the discarded slag and the pipeline wear depth are obtained, it is judged whether the discarded slag velocity control range at the pipeline outlet and the designed pipeline wear depth are satisfied, if not, the different deceleration working condition pipelines are designed by changing the pipeline deceleration structure parameters with the pipeline outlet discarded slag velocity control range and pipeline wear as the optimization targets, and the simulation is carried out according to steps S1-S2, and the optimal deceleration structure parameters of the pipeline are obtained under the satisfaction of the optimization targets.
[0042] In step S3, the deceleration structure parameters of the pipeline include quantity, installation position, and structural design parameters. The quantity of the deceleration structure refers to the total number of deceleration structures set under the simulated pipeline length, and the installation position refers to the installation position of different deceleration structures under the simulated pipeline length. The structural design parameters include the angle, width, and shape of the deceleration structure. In changing the pipeline deceleration structure parameters, the quantity and installation position of the deceleration structure are first determined in sequence. When the optimization target cannot be met under the optimized quantity and installation position, the structural design parameters are optimized to obtain the deceleration working condition pipeline under different deceleration structure parameters. According to steps S1 to S2, the speed distribution of the waste slag and the pipeline wear depth under different deceleration working condition pipelines are obtained. The deceleration working condition that meets the waste slag speed control range and the designed pipeline wear depth at the pipeline outlet is selected to determine the optimal deceleration structure parameters of the pipeline. In some embodiments, if the optimal deceleration structure parameters cannot be selected with the waste slag speed control range and pipeline wear at the pipeline outlet as the optimization targets, the optimization targets also include cost and material.
[0043] The control range of the slag velocity at the pipeline outlet and the designed pipeline wear depth are designed according to pipeline transportation. The designed pipeline wear depth is used as a threshold to determine whether the pipeline's deceleration structure meets the wear requirements under different deceleration conditions.
[0044] In the simulation, the calculation formula of the translational velocity of the waste slag is:
[0045] in: is the particle velocity vector at time t, in m / s; is the feeding speed, in m / s; is the total external force acting on the particles, including contact force, volume force and damping force, in N; m is the mass of the waste particles, in kg.
[0046] The calculation formula for the rotation speed of the waste slag is:
[0047] in, is the angular velocity vector at time t, in rad / s; is the initial angular velocity in rad / s; is the tangential component of the contact force, in N·m; is the moment of inertia of the waste particles, in kg·m 2 The rotation speed of the spoil is used to calculate the wear depth of the pipeline.
[0048] The pipeline wear depth is calculated using the Archard wear model, and the calculation formula is:
[0049]
[0050]
[0051] wherein is the Archard wear coefficient, is the wear factor, is the Vickers hardness (Pa), is the normal contact force, is the distance slid by the reject in the contact state, is the wear depth, is the geometric unit area of the pipeline, wherein the wear factor and the Vickers hardness are determined by the actual materials used.
[0052] In some embodiments, after determining the optimal deceleration structure parameter in step S3, the wear degree of different regions of the pipeline provided with the optimal deceleration structure parameter is obtained, and the maximum wear rate is determined, which is used as a basis for estimating the service life of the pipeline.
[0053] In some embodiments, after determining the optimal deceleration structure parameter in step S3, the stress distribution of different regions of the pipeline provided with the optimal deceleration structure parameter is obtained, and the overall stress of the pipeline is determined, which is used as a basis for determining the design load of the pipeline.
[0054] The present disclosure will be further described below through specific embodiments. However, the following embodiments are only used to illustrate the present disclosure, and the scope of the present disclosure is not limited thereto.
[0055] Embodiment 1 The pipeline transportation straight pipe deceleration design method described above is used in this embodiment, which includes the following steps: Step S1, a three-dimensional entity model of the pipeline for pipeline transportation is established; based on the physical property parameters of the reject, a discrete element simulation model of the pipeline transportation reject is established in combination with the three-dimensional entity model of the pipeline. In this embodiment, the reject transportation of a CZ reject site is taken as an example, and the reject is transported by a long and large slope pipeline, Figure 2 is a sectional view of the three-dimensional entity model structure of the pipeline, the pipeline in the simulation model is a straight pipe with a diameter of 1200 mm and a length of 50000 mm, Table 1 is the particle size and particle size composition of the reject, and Table 2 is the physical property parameters of the reject Table 1 Distribution percentage of reject particle size range
[0056] Table 2 Physical property parameters of the reject
[0057] Note: Among them, the Hercynian period, Yanshan period, Indosinian period is the formation age and tectonic background of rock. Common geological period labels in China include Caledonian period (Early Paleozoic, such as Silurian), Indosinian period (Triassic), Yanshan period (Jurassic-Cretaceous), Himalayan period (Cenozoic) Hercynian period is an important tectonic stage between Caledonian period and Indosinian period.
[0058] According to the lithology, particle size and particle size composition, the friction coefficient between the discarded slag particles and the friction coefficient between the discarded slag and the pipeline are measured, Figure 3 It is the process diagram for testing the friction coefficient between the discarded slag particles by using the fixed funnel method, Figure 4 It is a rest angle measurement schematic diagram. The friction coefficient between the discarded slag and the pipeline is calculated after being tested by using the inclined pipeline sliding method. According to the measured friction coefficient between the discarded slag particles and the friction coefficient between the discarded slag and the pipeline, the physical and mechanical parameters of the discarded slag are calibrated, and the physical property parameters of the discarded slag are updated.
[0059] Step S2, determine the pipeline transportation capacity and discarded slag feeding speed, and simulate the discarded slag transportation by using the pipeline transportation discarded slag discrete element simulation model. In this embodiment, when simulating for the first time, no deceleration structure is arranged in the pipeline. According to the transportation line condition, the straight pipe transportation is divided into four working conditions according to different slopes. The specific working condition parameters are shown in the following table 3.
[0060] Table 3 Pipeline transportation discarded slag discrete element simulation model working condition parameters
[0061] After simulation, the speed distribution of the discarded slag is analyzed in this embodiment, the speed distribution of the discarded slag is extracted as Figure 5 , and the speed distribution of the discarded slag in the pipeline is obtained as Figure 6 shown. It can be seen from the figure that under the slope of 30°~45°, with the increase of the slope, the particle speed increases linearly, and the discarded slag speed control range at the outlet is 8~10m / s. Among them, the outlet speed of working conditions 1-2, 1-3 and 1-4 all exceeds the discarded slag speed control range at the outlet.
[0062] Step S3, according to the simulation result, the deceleration structure parameters of the pipeline are optimized and designed, and the optimal deceleration structure parameters are obtained. Based on the above condition, the deceleration structure is arranged in the pipeline. The deceleration structure is a baffle, and the cross section of the baffle is a triangle, as shown in Figure 7 , the baffle is arranged along the length direction of the baffle pipeline, the length of the deceleration structure along the length direction of the baffle pipeline is 560mm, and the parameters of different arrangement modes of the deceleration structure in the pipeline are shown in table 4, and the schematic diagram is shown in Figure 8 . After simulation by using the above design method, the speed distribution of the discarded slag in the pipeline is obtained as Figure 9 shown.
[0063] Table 4 Position and number of different arrangements of deceleration structure
[0064] The Archard wear model can be used to obtain the pipe wear depth, which can reflect the morphological changes of the structure after wear. The wear of the structure is simulated for a physical time period of 120s, and the wear depth curves of the pipe and the baffle are shown in FIGS. 8 and 9. Figure 10 、 11
[0065] The deceleration working condition that meets the control range of the pipe outlet slag discharge speed and the design pipe wear depth is selected to determine the optimal deceleration structure parameters of the pipe.
[0066] Example 2 In this embodiment, based on example 1, the working conditions 2-1 to 2-4 are simulated and analyzed to obtain the stress distribution of different regions of the pipe under different working conditions, as shown in Table 5. According to the results, the overall stress of the pipe is determined to provide a basis for determining the pipe design load.
[0067] Table 5 Overall stress analysis of pipe structure under different working conditions
[0068] Note: The 95% guarantee rate design value usually refers to the estimated value of a certain parameter (such as strength, load, life, etc.). The true value has a 95% probability of falling within a certain confidence interval, or meets the specific reliability requirements. The 95% guarantee rate design value of the overall stress of the pipe structure is the upper limit value, and the calculation formula is: .
[0069] Example 3 The embodiment provides a pipe transportation straight pipe deceleration design system, which comprises: A model establishment module is used to establish a three-dimensional entity model of the pipe transportation pipe. Based on the physical property parameters of the slag, a pipe transportation slag discrete element simulation model is established in combination with the three-dimensional entity model of the pipe. A simulation module is used to determine the pipe transportation capacity and the slag feeding speed, and to simulate the slag transportation condition by using the pipe transportation slag discrete element simulation model. An analysis module is used to optimize the design of the deceleration structure parameters of the pipe according to the simulation results to obtain the optimal deceleration structure parameters.
[0070] The system or module and the like illustrated by the above embodiments can be specifically implemented by a computer chip or an entity, or by a product having certain functions. For the convenience of description, the above apparatus is described as various modules respectively described in functions. Of course, in the implementation of the present application, the functions of each module can be implemented in the same or more software and / or hardware, or the modules implementing the same function can be implemented by the combination of multiple sub-modules, etc.
[0071] The embodiment also provides an electronic device, including at least one processor, a memory connected with the at least one processor in communication, and at least one input / output interface connected with the at least one processor in communication; the memory stores instructions executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the foregoing pipeline transportation straight pipe deceleration design method. The input / output interface can include a display, a keyboard, a mouse, and a USB interface, for inputting and outputting data.
[0072] The above only describes the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A straight pipe speed reduction design method for pipeline transportation, characterized in that: The steps include: Step S1, establishing a three-dimensional solid model of a pipeline for pipeline transportation; establishing a discrete element simulation model of pipeline transportation waste slag based on the physical property parameters of the waste slag and the three-dimensional solid model of the pipeline; Step S2: determining the pipeline transportation volume and the waste slag feeding speed, and simulating the waste slag transportation situation using the pipeline transportation waste slag discrete element simulation model; Step S3: Optimize and design the deceleration structure parameters of the pipeline according to the simulation results to obtain the optimal deceleration structure parameters.
2. A straight pipe speed reduction design method for pipeline transportation according to claim 1, characterized in that: The method for determining the physical property parameters of the waste slag is: Obtain the lithology, particle size and particle size composition, bulk density, and physical and mechanical parameters of the waste; According to the lithology, particle size and particle size composition, and bulk density of the waste, the friction coefficient between waste particles and the friction coefficient between the waste and the pipeline are measured; The physical and mechanical parameters of the waste slag are calibrated according to the measured friction coefficient between the waste slag particles and the friction coefficient between the waste slag and the pipeline, and the physical property parameters of the waste slag are obtained after updating.
3. A straight pipe speed reduction design method for pipeline transportation according to claim 2, characterized in that: The friction coefficient between the waste particles is calculated by using the fixed funnel method, and the steps are as follows: The waste particles are selected according to the lithology, particle size and particle size composition, and bulk density of the waste; Slowly pouring the waste particles through a funnel onto a horizontal surface to form a cone; Measure the height and base radius of the cone; Calculate the angle of repose of the waste slag and obtain the friction coefficient between the waste slag particles based on the angle of repose; The friction coefficient between the waste slag and the pipeline is calculated by using the inclined pipeline sliding method, and the steps are as follows: The waste particles are selected according to the lithology, particle size and particle size composition, and bulk density of the waste; Cutting a section of an experimental pipeline identical to an actual conveying pipeline, fixing the experimental pipeline horizontally, and laying a layer of the waste slag particles flatly inside the experimental pipeline; Gradually increase the inclination of the experimental pipe and record it until the waste slag particles begin to slide as a whole. The inclination at this time is used as the pipe wall friction angle. Use an inclinometer to measure the pipe inclination. The friction coefficient between the waste slag and the pipeline is calculated based on the pipeline wall friction angle.
4. A straight pipe speed reduction design method for pipeline transportation according to claim 1, characterized in that: The method for establishing the discrete element simulation model of pipeline transportation waste slag is as follows: using discrete element simulation software EDEM, importing the pipeline three-dimensional solid model into EDEM as a template, setting parameters according to the physical property parameters of the waste slag, and establishing the discrete element simulation model of pipeline transportation waste slag.
5. A straight pipe speed reduction design method for pipeline transportation according to claim 1, characterized in that: The detailed steps of step S3 are as follows: according to the simulation results, the velocity distribution of the waste slag and the pipeline wear depth are obtained, and it is determined whether the waste slag velocity control range at the pipeline outlet and the designed pipeline wear depth are met. If not, the waste slag velocity control range at the pipeline outlet and the pipeline wear are used as the optimization targets, and the pipeline deceleration structure parameters are changed to design pipelines with different deceleration working conditions. Simulation is performed according to steps S1 to S2 to obtain the optimal deceleration structure parameters of the pipeline while meeting the optimization targets.
6. A straight pipe speed reduction design method for pipeline transportation according to claim 5, characterized in that: In the simulation, the calculation formula of the translational velocity of the waste slag is: in: is the particle velocity vector at time t; is the feeding speed; is the total external force acting on the particles, including contact force, volume force and damping force; m is the mass of the waste particles.
7. A straight pipe speed reduction design method for pipeline transportation according to claim 5, characterized in that: The pipeline wear depth is calculated using the Archard wear model, and the calculation formula is: In the formula is the pipe wear depth, is the wear factor, is the Vickers hardness, is the normal contact force, is the distance the slag slides in contact state, is the geometric unit area of the pipeline, where the wear factor and Vickers hardness are determined by the actual material used in the pipeline.
8. A straight pipe speed reduction design method for pipeline transportation according to any one of claims 1 to 7, characterized in that: After determining the optimal deceleration structure parameters in step S3, the wear degree of different areas of the pipeline with the optimal deceleration structure parameters is obtained, and the maximum wear rate is determined to provide a basis for estimating the service life of the pipeline.
9. A straight pipe speed reduction design method for pipeline transportation according to any one of claims 1 to 7, characterized in that: After determining the optimal deceleration structural parameters in step S3, the stress distribution of different areas of the pipeline with the optimal deceleration structural parameters is obtained to clarify the overall stress of the pipeline, which is used to provide a basis for determining the design load of the pipeline.
10. A straight pipe deceleration design system for pipeline transportation, characterized in that: The system comprises: A model building module is used to build a three-dimensional solid model of the pipeline for pipeline transportation; based on the physical property parameters of the waste slag, a discrete element simulation model of the pipeline transportation waste slag is built in combination with the three-dimensional solid model of the pipeline; A simulation module is used to determine the pipeline transportation volume and the waste slag feeding speed, and to simulate the waste slag transportation situation using the pipeline transportation waste slag discrete element simulation model; The analysis module is used to optimize the design of the deceleration structure parameters of the pipeline according to the simulation results to obtain the optimal deceleration structure parameters.