Cyclone separator, method and device for determining fatigue limit of cyclone separator and storage medium

Abstract

The invention discloses a method and device for determining the fatigue limit of a cyclone separator, the cyclone separator and a storage medium. The method comprises the following steps: determining the maximum stress value of a plurality of cyclones under the action of preset static internal pressure; after the maximum stress value meets a preset safety condition, flow field distribution in the cyclones, stress borne by the cyclones and deformation results of the cyclones are determined when the constant-pressure gas, the fluctuating gas and the gas-solid two-phase fluid are input into the cyclones; respectively determining a first stress and a second stress at the inlet of the shell when the constant-pressure gas and the fluctuating gas are input into the cyclone separator; performing a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell material; and the fatigue limit value of the cyclone separator is determined based on the flow field distribution, the stress borne by the cyclones, the deformation result of the cyclones and the fatigue strength. The safety and stability of the cyclone separator can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas transportation, and in particular to a method and device for determining the fatigue limit of a cyclone separator, a cyclone separator, and a storage medium. Background Art

[0002] As an important and indispensable equipment in natural gas transmission stations, cyclone separators play a key role in the safe operation of natural gas pipelines. The inlet of the natural gas cyclone separator is subject to the pulsating impact force of the fluid and the working pressure is high. Therefore, cracks are very likely to occur at the welding points of the cyclone separator. In the case of severe cracks, it will also affect the operation of the separator. As the cracks gradually increase, the entire separator equipment may fail. During the high-pressure natural gas processing and long-distance pipeline transportation process, once the separator fails, the unseparated solid dust and droplets and other impurities will cause major accidents such as damage to large compressor units, failure of metering instruments, and station suspension, which will seriously affect the gas supply safety and normal operation of the pipeline. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method, device, cyclone separator and storage medium for determining the fatigue limit of a cyclone separator, so as to fill the lack of a method for clearly calculating the fatigue limit value of a crack at the inlet of a cyclone separator in the prior art.

[0004] In order to achieve the above-mentioned object, the first aspect of the present application provides a method for determining the fatigue limit of a cyclone separator, which is applied to a cyclone separator, wherein the cyclone separator comprises a plurality of cyclones and a housing, and a flow field generated by the plurality of cyclones when running acts on the housing, and the method comprises:

[0005] Determine the maximum stress value of multiple cyclones under the action of a preset static internal pressure;

[0006] After the maximum stress value meets the preset safety condition, the flow field distribution in the multiple cyclones, the stresses received by the multiple cyclones and the deformation results of the multiple cyclones are determined respectively when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones;

[0007] determining a first stress at the housing inlet when constant pressure gas is input to the cyclone separator, and a second stress at the housing inlet when fluctuating pressure gas is input to the cyclone separator;

[0008] Performing a low-cycle uniaxial fatigue test on the cyclone separator based on a first stress and a second stress to determine the fatigue strength of the shell material;

[0009] The fatigue limit value of the cyclone separator is determined based on the flow field distribution, the stress exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones.

[0010] In the embodiment of the present application, respectively determining the flow field distribution in the multiple cyclones, the stresses on the multiple cyclones, and the deformation results of the multiple cyclones when constant pressure gas, fluctuating gas, and gas-solid two-phase fluid are input into the multiple cyclones includes:

[0011] The Reynolds stress model is used to determine the flow conditions of the fluids in multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones.

[0012] Fluid-structure interaction analysis was performed on multiple cyclones to confirm the analysis results;

[0013] Determine the flow field distribution according to the flow conditions and analysis results;

[0014] Determine the flow field pressure in multiple cyclones based on the standard wall function;

[0015] The flow field pressure is set to the pressure on the solid walls of the multiple cyclones;

[0016] The pressures at the air outlets, sewage outlets and inlets of the multiple cyclones are set as the pressures on the solid walls of the multiple cyclones to determine the stresses on the multiple cyclones and the deformation results of the multiple cyclones.

[0017] In the embodiment of the present application, determining the flow field distribution according to the flow conditions and analysis results includes:

[0018] The flow field distribution is determined according to the flow conditions and analysis results by combining the semi-implicit pressure coupling equation method, the finite element method, the spatial discretization format and the first-order upwind format.

[0019] In the embodiment of the present application, a low-cycle uniaxial fatigue test is performed on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell, including:

[0020] The first stress and the second stress are used as loading loads;

[0021] Based on the loading load, low cycle uniaxial fatigue test was carried out on the cyclone separator to determine the fatigue strength.

[0022] In the embodiment of the present application, determining the maximum stress value of a plurality of cyclones under the action of a preset static internal pressure includes:

[0023] A preset static internal pressure is applied to the air outlets, sewage outlets and inlets of the multiple cyclones to determine the maximum stress values ​​of the multiple cyclones.

[0024] In the embodiment of the present application, determining the fatigue limit value of the cyclone separator based on the maximum stress value, flow field distribution and fatigue strength includes:

[0025] Through the fatigue tool in the preset simulation integrated platform, fatigue numerical simulation tests are carried out on the maximum stress value, flow field distribution, stress of multiple cyclones, deformation results of multiple cyclones and fatigue strength, and the fatigue limit value is determined in combination with the mean stress correction theory.

[0026] In the embodiment of the present application, the fatigue limit value is determined to satisfy formula (1):

[0027]

[0028] Where m is the effective number of fatigue numerical simulation tests, n is the value of the stress level in the fatigue numerical simulation test, and σ i is the stress level of the cyclone separator when the value of the stress level is i, V i is the number of fatigue numerical simulation tests when the stress level is i, σ R is the fatigue limit value.

[0029] A second aspect of the present application provides a device for determining the fatigue limit of a cyclone separator, the device comprising:

[0030] a memory configured to store instructions; and

[0031] The processor is configured to call instructions from the memory and implement the above method for determining the fatigue limit of a cyclone separator when executing the instructions.

[0032] A third aspect of the present application provides a cyclone separator, comprising:

[0033] Multiple cyclones;

[0034] shell;

[0035] The above-mentioned device is used to determine the fatigue limit of a cyclone separator.

[0036] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the above-mentioned method for determining the fatigue limit of a cyclone separator.

[0037] Through the above technical scheme, the maximum stress value of multiple cyclones of the cyclone separator under the preset static internal pressure is determined. After the maximum stress value meets the preset safety conditions, the flow field distribution in the multiple cyclones, the stresses exerted on the multiple cyclones and the deformation results of the multiple cyclones are determined respectively when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones; the first stress at the inlet of the outer shell when constant pressure gas is input into the cyclone separator, and the second stress at the inlet of the outer shell when fluctuating gas is input into the cyclone separator are determined; based on the first stress and the second stress, a low-cycle uniaxial fatigue test is performed on the cyclone separator to determine the fatigue strength of the outer shell material; the fatigue limit value of the cyclone separator is determined based on the flow field distribution, the pressure exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones, so that the fatigue limit of the cyclone separator can be judged according to the fatigue limit value, thereby improving the safety and stability of the cyclone separator during operation.

[0038] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0040] Figure 1 A flow chart of a method for determining a fatigue limit of a cyclone separator according to an embodiment of the present application is schematically shown;

[0041] Figure 2 Schematically shows a fluctuation pressure input curve diagram according to an embodiment of the present application;

[0042] Figure 3 A diagram schematically shows a curve relationship between stress and life according to an embodiment of the present application;

[0043] Figure 4 A structural block diagram of a device for determining the fatigue limit of a cyclone separator according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Figure 1 A flow chart of a method for determining the fatigue limit of a cyclone separator according to an embodiment of the present application is schematically shown. Figure 1 As shown, an embodiment of the present application provides a method for determining the fatigue limit of a cyclone separator, the method is applied to a cyclone separator, the cyclone separator includes a plurality of cyclones and a housing, and the flow field generated by the plurality of cyclones when in operation acts on the housing. The method may include the following steps.

[0048] Step 101: determining the maximum stress value of a plurality of cyclones under a preset static internal pressure;

[0049] In the embodiment of the present application, a 3D solid model of a finite element analysis of multiple cyclones inside a cyclone separator can be established, the model can be imported into ANSYS-WORKBENCH software, and the Static structure module can be used to simulate and calculate the maximum stress values ​​of multiple cyclones in the cyclone separator under the action of a preset static internal pressure. Specifically, in one embodiment, displacement constraints can be set for three positions, namely, the air outlet, the sewage outlet, and the inlet of the cyclone, respectively. The specific displacement constraints can be determined according to the actual situation, and then the preset static internal pressure is applied to the inner wall of the cyclone to calculate the maximum stress value of the cyclone.

[0050] Step 102: after the maximum stress value meets the preset safety condition, respectively determining the flow field distribution in the multiple cyclones, the stresses on the multiple cyclones, and the deformation results of the multiple cyclones when constant pressure gas, fluctuating gas, and gas-solid two-phase fluid are input into the multiple cyclones;

[0051] Specifically, in one embodiment, the fluid in the cyclone separator can be a gas, and the RSM model (Reynolds Stress Model) can be used to couple pressure and velocity using the SIMPLE algorithm (Semi-Implicit Method for Pressure-Linked Equations), discretize pressure terms using the Standard method (a standard discrete pressure term processing method in the industry), discretize momentum equations using the QUICK difference format (Quadratic Upstream Interpolation for Convective Kinematics, a numerical difference format), and discretize turbulent kinetic energy, dissipation rate, and Reynolds stress using the FUS first-order upwind scheme (a numerical format) to simulate the flow field distribution of the entire cyclone separator and the cyclone. Specifically, in one embodiment, the flow field distribution can be analyzed, the flow field pressure in the cyclone can be transferred to the solid wall of the cyclone through the fluid-solid coupling surface, constraints can be set on the cyclone at three positions: the air outlet, the sewage outlet, and the inlet, and the stress and deformation results of the cyclone can be calculated.

[0052] Step 103: determining a first stress at the inlet of the housing when constant pressure gas is input into the cyclone separator, and a second stress at the inlet of the housing when fluctuating pressure gas is input into the cyclone separator;

[0053] In one embodiment, the first stress and the second stress at the inlet of the shell when constant-pressure gas and fluctuating gas are input into the cyclone separator can be calculated by simulation. The constant-pressure gas means that the pressure of the gas input into the cyclone separator is constant, while the fluctuating gas means that the pressure of the gas input into the cyclone separator is fluctuating.

[0054] Step 104: performing a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell material;

[0055] In one embodiment, the fatigue strength of the cyclone separator shell material can be determined. By comparing the expected yield strength of the steel, it can be determined whether the steel meets the requirements, so that the steel can be used to make the cyclone separator, thereby improving the safety and stability of the cyclone separator from the material perspective.

[0056] Step 105: Determine the fatigue limit value of the cyclone separator based on the flow field distribution, the stresses exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones.

[0057] Through the above technical scheme, the maximum stress value of multiple cyclones of the cyclone separator under the preset static internal pressure is determined. After the maximum stress value meets the preset safety conditions, the flow field distribution in the multiple cyclones, the stresses exerted on the multiple cyclones and the deformation results of the multiple cyclones are determined respectively when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones; the first stress at the inlet of the outer shell when constant pressure gas is input into the cyclone separator, and the second stress at the inlet of the outer shell when fluctuating gas is input into the cyclone separator are determined; based on the first stress and the second stress, a low-cycle uniaxial fatigue test is performed on the cyclone separator to determine the fatigue strength of the outer shell material; the fatigue limit value of the cyclone separator is determined based on the flow field distribution, the pressure exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones, so that the fatigue limit of the cyclone separator can be judged according to the fatigue limit value, thereby improving the safety and stability of the cyclone separator during operation.

[0058] In an embodiment of the present application, respectively determining the flow field distribution within multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into multiple cyclones, the stresses exerted on multiple cyclones and the deformation results of multiple cyclones may include: respectively determining the flow conditions of the fluids within multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into multiple cyclones through a Reynolds stress model; performing fluid-solid coupling analysis on multiple cyclones to determine the analysis results; determining the flow field distribution based on the flow conditions and the analysis results; determining the flow field pressure within the multiple cyclones based on a standard wall function; setting the flow field pressure to the pressure exerted on the solid walls of the multiple cyclones; setting the pressures of the air outlets, sewage outlets and inlets of the multiple cyclones to the pressure exerted on the solid walls of the multiple cyclones, so as to determine the stress exerted on the multiple cyclones and the deformation results of the multiple cyclones.

[0059] In the embodiments of the present application, the Reynolds Stress Model (RSM) is used to describe the Reynolds stress components in all directions in turbulence. Fluid-solid coupling analysis refers to a numerical simulation method that simultaneously considers the interaction between fluid dynamics (fluid flow) and solid mechanics (solid structure). In fluid-solid coupling analysis, there is an interaction between the fluid and the solid, that is, the fluid exerts pressure or force on the solid, and the deformation of the solid affects the pattern and characteristics of the fluid flow. Standard Wall Function (SWF) is a numerical technique used to simulate boundary layer flow in computational fluid dynamics (CFD). The boundary layer refers to the area close to the solid surface where the fluid velocity gradually increases from static to the free stream velocity away from the wall.

[0060] In an embodiment of the present application, determining the flow field distribution according to the flow conditions and analysis results may include: determining the flow field distribution according to the flow conditions and analysis results in combination with a semi-implicit pressure coupling equation method, a finite element method, a spatial discrete format, and a first-order upwind format.

[0061] In the embodiment of the present application, the semi-implicit pressure coupling equation method is a numerical method for solving the Navier-Stokes equations (including continuity equations and momentum equations) in fluid dynamics. In this method, the coupling of pressure and velocity fields is achieved through a series of iterations, in which the pressure field is usually implicitly processed, while the velocity field is explicitly updated. This method is generally used to deal with the flow problem of incompressible fluids. The finite element method is a numerical method for solving partial differential equations (such as the Navier-Stokes equations in fluid dynamics). It establishes a mathematical model of numerical solutions by dividing the solution region into a finite number of discrete elements (such as triangles, quadrilaterals or voxels) and approximating the solution on each element. The finite element method is widely used in fluid mechanics to solve complex flow and heat transfer problems. The spatial discrete format refers to a numerical method for discretizing the spatial part of partial differential equations. In CFD, these formats generally describe how to convert continuous spatial variables into numerical solutions on discrete grid points or elements. The choice of these formats directly affects the accuracy and stability of the numerical solution. The first-order upwind format is a format used in numerical methods to discretize convection terms (i.e., transport phenomena in a fluid). It uses local flow field information, especially the gradient of the flow variable in the direction of fluid flow, to approximate the discrete form of the convection term. The choice of the upwind format affects the numerical dissipation and numerical diffusion effects in the numerical simulation, and is crucial for a stable and accurate numerical solution.

[0062] In an embodiment of the present application, performing a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell may include: taking the first stress and the second stress as loading loads; and based on the loading loads, performing a low-cycle uniaxial fatigue test on the cyclone separator to determine the fatigue strength.

[0063] In the embodiments of the present application, a low-cycle uniaxial fatigue test is a fatigue test method, which is usually carried out under high load and low cycle conditions. Relative to high-cycle fatigue (high cycle number, low stress) test, a low-cycle fatigue test simulates the fatigue performance of a material or structure under high stress level and low cycle number. Fatigue strength refers to the maximum stress level that a material or structure can withstand under fatigue loading, usually described by the number of cyclic loads or cycles. Fatigue strength is a key parameter determined based on the results of fatigue tests and is used to evaluate the fatigue life of a material or structure. In a fatigue test, the loading load refers to the force or stress applied to the specimen. It can be a dynamic load, applying a periodically changing load to the specimen to simulate stress changes under actual working conditions. Therefore, a low-cycle uniaxial fatigue test is performed on a cyclone separator to determine the fatigue strength it can withstand in actual use. By applying a simulated working load, the fatigue performance of the cyclone separator during its design life can be evaluated, thereby optimizing the design or determining the replacement cycle.

[0064] In an embodiment of the present application, determining the maximum stress value of multiple cyclones under a preset static internal pressure may include: applying a preset static internal pressure to the air outlets, sewage outlets and inlets of the multiple cyclones to determine the maximum stress value of the multiple cyclones.

[0065] In an embodiment of the present application, determining the fatigue limit value of a cyclone separator based on the maximum stress value, flow field distribution and fatigue strength may include: performing fatigue numerical simulation tests on the maximum stress value, flow field distribution, stress exerted on multiple cyclones, deformation results of multiple cyclones and fatigue strength through a fatigue tool in a preset simulation integrated platform, and determining the fatigue limit value in combination with the average stress correction theory.

[0066] In the embodiments of the present application, the mean stress correction theory is a method used to correct stress amplitude in fatigue analysis. This theory takes into account the effect of mean stress on fatigue life. The stress amplitude in fatigue analysis usually refers to the fluctuation range of cyclic stress, while the mean stress refers to the average value of cyclic stress. Different mean stress levels will affect the fatigue life of the material.

[0067] In the embodiment of the present application, the fatigue limit value can be determined by satisfying formula (1):

[0068]

[0069] Where m is the effective number of fatigue numerical simulation tests, n is the value of the stress level in the fatigue numerical simulation test, and σ i is the stress level of the cyclone separator when the value of the stress level is i, V i is the number of fatigue numerical simulation tests when the stress level is i, σ Ris the fatigue limit value.

[0070] The following is a specific embodiment:

[0071] 1. Establish a 3D solid model of the cyclone inside the cyclone separator by finite element analysis, import the model into ANSYS-WORKBENCH software, and use the Static structure module to simulate and calculate the stress and deformation law of the cyclone inside the cyclone separator under the action of static internal pressure to verify its static strength. Among them, the shell material of the cyclone separator is Q345R, and the material properties are shown in Table 1:

[0072] Table 1

[0073] Type of material Elastic modulus E Poisson's ratio μ Ultimate Strength Yield Strength density Q345 203.8Ma 0.3 530MPa 330MPa <![CDATA[7850kg·m -3 ]]>

[0074] Displacement constraints are set for the cyclone at the outlet, sewage outlet and inlet, and the load boundary applied to the cyclone is to apply a static internal pressure of 10MPa to the inner wall of the cyclone. The maximum stress value of the cyclone is calculated to verify its static strength.

[0075] 2. Through the Reynolds stress model, the flow conditions of the fluid in the cyclone under three boundary conditions: constant pressure gas, fluctuating gas, and gas-solid two-phase fluid. The fluid-solid coupling analysis of the cyclone is carried out to reveal the flow field distribution in the cyclone and the stress and deformation results of the cyclone when different fluids are input.

[0076] The fluid in the cyclone separator is gas. The viscosity of pure natural gas is Pa·s and the density is 0.7174kg / m3. The near-wall surface is processed using the standard wall function and set to no slip. The natural gas enters the cyclone at a vertical angle of 90 degrees and the pressure is 6.0MPa. The outlet pressure of the natural gas is -0.1MPa. The pressure of the natural gas outlet is 0MPa. By analyzing the flow field, the flow field pressure in the cyclone is transferred to the solid wall of the cyclone through the fluid-solid coupling surface. Constraints are set for the cyclone at the outlet, outlet and inlet, and the stress and deformation results of the cyclone are calculated.

[0077] 3. Simulate the flow field inside the cyclone separator shell under constant pressure gas and fluctuating gas input, and carry out fluid-solid coupling analysis of the separator shell. Drawing on the micro-crack phenomenon at the interface of a certain type of cyclone separator, this paper focuses on the stress and deformation change characteristics at the interface of the separator shell, and obtains the stress and deformation distribution law in this area. Among them, the fluctuating pressure input curve is as follows Figure 2As shown. It is calculated that under fluctuating pressure, the maximum stress value of the solid structure of the cyclone increases by nearly 0.5 times. Fluctuating pressure has a great influence on the deformation and stress of the cyclone. The maximum deformation of the cyclone under the fluctuating pressure gas phase flow field is 2.6 times that of the constant pressure gas phase flow field, and the maximum stress is about 30MPa higher than that of the constant pressure gas phase flow field. In addition, the stress and deformation of the cyclone under fluctuating pressure show obvious asymmetric distribution.

[0078] 4. Mechanical calculations were performed on the cyclone separator shell to obtain the stress and deformation distribution of the separator shell under stable and unstable pressure input conditions (i.e., constant pressure gas and fluctuating gas). Under fluctuating pressure input, the maximum pressure in the separator shell inlet area can reach 285MPa, and the maximum deformation value is 0.716mm. It can be seen that fluctuating pressure greatly increases the maximum stress and maximum deformation value of the separator shell.

[0079] 5. A standard specimen was made of a certain type of cyclone separator shell material, and the stress value at the separator inlet was used as the loading load to carry out a low-cycle uniaxial fatigue test to evaluate the fatigue strength of the cyclone separator material. In the fatigue test, the external excitation force used was 20Hz frequency, 160MPa stress level, and 12MPa stress increment, and the specimen was subjected to a low-cycle fatigue test. The stress-life curve obtained from the fatigue test is shown in Figure 2. Figure 3 shown.

[0080] The fatigue limit is calculated based on the fatigue test results. The calculation formula of the conditional fatigue limit is:

[0081]

[0082] Where m is the effective number of fatigue numerical simulation tests, n is the value of the stress level in the fatigue numerical simulation test, and σ i is the stress level of the cyclone separator when the value of the stress level is i, V i is the number of fatigue numerical simulation tests when the stress level is i, σ R is the fatigue limit value.

[0083] 6. The fatigue tool (Fatigue Tool) in ANSYS Workbench is used for fatigue numerical simulation. This analysis belongs to linear static analysis. The average stress correction theory SN-Gerber is selected. The fatigue limit obtained by simulation calculation is 135MPa, which is close to the fatigue limit of the specimen obtained by fatigue test 145MPa, which verifies the reliability of the simulation calculation. The cyclone separator is prone to fatigue damage in the inlet area, which coincides with the location of the separator cracking in the actual station. The airflow in the separator forms a large reverse thrust on the wall surface in the inlet area, resulting in large deformation and stress on the wall surface in the inlet area of ​​the cyclone separator. In addition, the deformation and stress of the cyclone under fluctuating pressure are greater than the deformation and stress of the separator under constant pressure. The simulation results combined with the fatigue test show that the alternating stress caused by fluctuating pressure is the cause of cracks in the inlet area.

[0084] Figure 2 The following schematically shows a fluctuation pressure input curve diagram according to an embodiment of the present application. Figure 2 As shown, the abscissa represents the time, and the ordinate represents the pressure of the fluctuating gas input to the cyclone separator.

[0085] Figure 3 The stress and life curve diagram according to the embodiment of the present application is schematically shown. Figure 3 As shown, the horizontal axis represents the life of the steel at the inlet of the cyclone separator, and the vertical axis represents the maximum stress value borne by the inlet of the cyclone separator.

[0086] Figure 4 The structure block diagram of a device for determining the fatigue limit of a cyclone separator according to an embodiment of the present application is schematically shown. Figure 4 As shown, an embodiment of the present application provides a device for determining the fatigue limit of a cyclone separator, which may include:

[0087] Memory 410, configured to store instructions; and

[0088] The processor 420 is configured to call instructions from the memory 410 and implement the above-mentioned method for determining the fatigue limit of a cyclone separator when executing the instructions.

[0089] Specifically, in the embodiment of the present application, the processor 420 may be configured to:

[0090] Determine the maximum stress value of multiple cyclones under the action of a preset static internal pressure;

[0091] After the maximum stress value meets the preset safety condition, the flow field distribution in the multiple cyclones, the stresses received by the multiple cyclones and the deformation results of the multiple cyclones are determined respectively when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones;

[0092] determining a first stress at the housing inlet when constant pressure gas is input to the cyclone separator, and a second stress at the housing inlet when fluctuating pressure gas is input to the cyclone separator;

[0093] Performing a low-cycle uniaxial fatigue test on the cyclone separator based on a first stress and a second stress to determine the fatigue strength of the shell material;

[0094] The fatigue limit value of the cyclone separator is determined based on the flow field distribution, the stress exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones.

[0095] Furthermore, the processor 420 may be configured to:

[0096] The method of respectively determining the flow field distribution in the multiple cyclones, the stresses on the multiple cyclones and the deformation results of the multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones includes: determining the flow conditions of the fluids in the multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones through the Reynolds stress model; performing fluid-solid coupling analysis on the multiple cyclones to determine the analysis results; determining the flow field distribution according to the flow conditions and the analysis results; determining the flow field pressure in the multiple cyclones according to the standard wall function; setting the flow field pressure as the pressure on the solid wall of the multiple cyclones; setting the pressure of the air outlet, sewage outlet and inlet of the multiple cyclones as the pressure on the solid wall of the multiple cyclones, so as to determine the stresses on the multiple cyclones and the deformation results of the multiple cyclones.

[0097] Furthermore, the processor 420 can also be configured to: determine the flow field distribution according to the flow conditions and analysis results, including: determine the flow field distribution according to the flow conditions and analysis results in combination with a semi-implicit pressure coupling equation method, a finite element method, a spatial discrete format, and a first-order upwind format.

[0098] Further, the processor 420 can also be configured to: perform a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell, including: taking the first stress and the second stress as loading loads; based on the loading load, perform a low-cycle uniaxial fatigue test on the cyclone separator to determine the fatigue strength.

[0099] Furthermore, the processor 420 can also be configured to: determine the maximum stress value of multiple cyclones under the preset static internal pressure, including: applying the preset static internal pressure to the air outlet, sewage outlet and inlet of the multiple cyclones to determine the maximum stress value of the multiple cyclones.

[0100] Furthermore, the processor 420 can also be configured to: determine the fatigue limit value of the cyclone separator based on the maximum stress value, flow field distribution and fatigue strength, including: performing fatigue numerical simulation tests on the maximum stress value, flow field distribution, stress on multiple cyclones, deformation results and fatigue strength of multiple cyclones through the fatigue tool in the preset simulation integrated platform, and determining the fatigue limit value in combination with the average stress correction theory.

[0101] Further, the processor 420 may also be configured to: determine that the fatigue limit value satisfies formula (1):

[0102]

[0103] Where m is the effective number of fatigue numerical simulation tests, n is the value of the stress level in the fatigue numerical simulation test, and σ i is the stress level of the cyclone separator when the value of the stress level is i, V i is the number of fatigue numerical simulation tests when the stress level is i, σ R is the fatigue limit value.

[0104] Through the above technical solution, the processor 420 determines the maximum stress value of multiple cyclones of the cyclone separator under the action of a preset static internal pressure. After the maximum stress value meets the preset safety conditions, the processor 420 respectively determines the flow field distribution in the multiple cyclones, the stresses exerted on the multiple cyclones and the deformation results of the multiple cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the multiple cyclones; the processor 420 determines the first stress at the inlet of the outer shell when constant pressure gas is input into the cyclone separator, and the second stress at the inlet of the outer shell when fluctuating gas is input into the cyclone separator; the processor 420 performs a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the outer shell material; the processor 420 determines the fatigue limit value of the cyclone separator based on the flow field distribution, the pressure exerted on the multiple cyclones, the deformation results and the fatigue strength of the multiple cyclones, so that the fatigue limit of the cyclone separator can be judged according to the fatigue limit value, thereby improving the safety and stability of the cyclone separator during operation.

[0105] The present application also provides a cyclone separator, comprising:

[0106] Multiple cyclones;

[0107] shell;

[0108] A device for determining the fatigue limit of a cyclone separator as described above.

[0109] An embodiment of the present application further provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the above-mentioned method for determining the fatigue limit of a cyclone separator.

[0110] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0111] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0112] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0113] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0114] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0115] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0116] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0117] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0118] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining the fatigue limit of a cyclone separator, applied to a cyclone separator, wherein the cyclone separator comprises a plurality of cyclones and a housing, wherein the flow field generated by the plurality of cyclones during operation acts on the housing, and wherein: The method comprises: Determining maximum stress values ​​of the plurality of cyclones under a preset static internal pressure; After the maximum stress value satisfies a preset safety condition, respectively determining the flow field distribution inside the plurality of cyclones, the stresses experienced by the plurality of cyclones, and the deformation results of the plurality of cyclones when constant pressure gas, fluctuating gas, and gas-solid two-phase fluid are input into the plurality of cyclones; determining a first stress at the inlet of the housing when the constant pressure gas is input to the cyclone separator, and a second stress at the inlet of the housing when the fluctuating pressure gas is input to the cyclone separator; Performing a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell material; The fatigue limit value of the cyclone separator is determined based on the flow field distribution, the stresses exerted on the plurality of cyclones, the deformation results of the plurality of cyclones, and the fatigue strength.

2. The method according to claim 1, characterized in that The determining of the flow field distribution in the plurality of cyclones, the stresses on the plurality of cyclones and the deformation results of the plurality of cyclones when constant pressure gas, fluctuating gas and gas-solid two-phase fluid are input into the plurality of cyclones respectively comprises: Determining the flow conditions of the fluids in the plurality of cyclones respectively when the constant pressure gas, the fluctuating gas and the gas-solid two-phase fluid are input into the plurality of cyclones by using a Reynolds stress model; Performing fluid-structure coupling analysis on the plurality of cyclones to determine analysis results; Determining the flow field distribution according to the flow condition and the analysis result; determining the flow field pressure within the plurality of cyclones according to a standard wall function; Setting the flow field pressure to the pressure exerted on the solid wall surfaces of the plurality of cyclones; The pressures of the air outlets, sewage outlets and inlets of the multiple cyclones are set as the pressures exerted on the solid walls of the multiple cyclones, so as to determine the stresses exerted on the multiple cyclones and the deformation results of the multiple cyclones.

3. The method according to claim 2, characterized in that Determining the flow field distribution according to the flow condition and the analysis result includes: The flow field distribution is determined according to the flow conditions and the analysis results in combination with a semi-implicit pressure coupling equation method, a finite element method, a spatial discrete format and a first-order upwind format.

4. The method according to claim 1, characterized in that: The performing a low-cycle uniaxial fatigue test on the cyclone separator based on the first stress and the second stress to determine the fatigue strength of the shell comprises: using the first stress and the second stress as loading loads; Based on the loading load, a low cycle uniaxial fatigue test is performed on the cyclone separator to determine the fatigue strength.

5. The method according to claim 1, characterized in that Determining the maximum stress values ​​of the plurality of cyclones under the action of a preset static internal pressure comprises: The preset static internal pressure is applied to the air outlets, sewage outlets and inlets of the plurality of cyclones to determine the maximum stress values ​​of the plurality of cyclones.

6. The method according to claim 1, characterized in that Determining the fatigue limit value of the cyclone separator based on the maximum stress value, the flow field distribution and the fatigue strength comprises: The fatigue tool in the preset simulation integrated platform is used to perform fatigue numerical simulation tests on the maximum stress value, the flow field distribution, the stress exerted on the multiple cyclones, the deformation results of the multiple cyclones and the fatigue strength, and the fatigue limit value is determined in combination with the mean stress correction theory.

7. The method according to claim 6, characterized in that Determine that the fatigue limit value satisfies formula (1): Wherein, m is the effective test number of the fatigue numerical simulation test, n is the value of the stress level in the fatigue numerical simulation test, σ i is the stress level of the cyclone separator when the value of the stress level is i, V i is the number of fatigue numerical simulation tests when the value of the stress level is i, σ R is the fatigue limit value.

8. A device for determining the fatigue limit of a cyclone separator, characterized in that include: a memory configured to store instructions; as well as A processor is configured to call the instructions from the memory and implement the method for determining the fatigue limit of a cyclone separator according to any one of claims 1 to 7 when executing the instructions.

9. A cyclone separator, characterized in that: include: Multiple cyclones; shell; An apparatus for determining the fatigue limit of a cyclone separator according to claim 8.

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions for causing a machine to execute the method for determining the fatigue limit of a cyclone separator according to any one of claims 1 to 7.

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