Finite element-based high-temperature superheater crack analysis method

Abstract

The invention provides a finite element-based high-temperature superheater crack analysis method, which relates to the technical field of superheater crack analysis and comprises the following steps of: constructing a three-dimensional geometric model of a high-temperature superheater on the basis of standard parameters of the high-temperature superheater; obtaining corresponding first finite element distribution based on the three-dimensional geometric model; obtaining a preset stress parameter of each finite element unit based on a load condition of a first boiler of the generator set and the finite element solving model; real-time stress parameters of each finite element unit of the high-temperature superheater are obtained, the finite element units with abnormal stress are subdivided again, abnormal paths are obtained, and development parameters of cracks are predicted; and based on the development parameters and the corresponding actual development parameters, the high-temperature superheater is optimized. The precision and efficiency of crack analysis of the high-temperature superheater are improved, the production safety is ensured, and the service life of the high-temperature superheater is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of superheater crack analysis, and in particular to a high-temperature superheater crack analysis method based on finite elements. Background Art

[0002] At present, with the continuous development of science and technology, science and technology have penetrated into all aspects of production and life. Electricity, as the energy supporting science and technology, has become an indispensable part of people's production and life. In the process of coal-fired power generation, the high-temperature superheater of the boiler may crack. Once the crack expands and enters the instability stage, it will quickly expand and cause the pipe to break, which is a major safety hazard.

[0003] Therefore, the present invention proposes a high temperature superheater crack analysis method based on finite element. Summary of the invention

[0004] The present invention provides a high-temperature superheater crack analysis method based on finite elements, which is used to construct a three-dimensional geometric model of the high-temperature superheater, divide the finite element units for analysis, and further subdivide the abnormal finite element units for detailed analysis, predict the development of cracks, optimize the high-temperature superheater, improve the accuracy and efficiency of the high-temperature superheater crack analysis, ensure production safety, and extend the service life of the high-temperature superheater.

[0005] In one aspect, the present invention provides a high temperature superheater crack analysis method based on finite element method, comprising:

[0006] Step 1: constructing a three-dimensional geometric model of the high-temperature superheater based on standard parameters of the high-temperature superheater;

[0007] Step 2: Based on the three-dimensional geometric model, obtain a corresponding first finite element distribution;

[0008] Step 3: Based on the load condition of the first boiler of the generator set and the finite element solution model, obtain the preset stress parameters of each finite element unit;

[0009] Step 4: Obtain the real-time stress parameters of each finite element unit of the high-temperature superheater, subdivide the finite element units with abnormal stress, obtain the abnormal path and predict the development parameters of the crack;

[0010] Step 5: Optimize the high temperature superheater based on the development parameters and the corresponding actual development parameters.

[0011] On the other hand, based on the standard parameters of the high temperature superheater, a three-dimensional geometric model of the high temperature superheater is constructed, including:

[0012] Based on the standard parameters of the high-temperature superheater, the corresponding structural parameters and material parameters of each superheating area are obtained;

[0013] Constructing a model training set based on the set parameters of each overheating area and the material parameters;

[0014] Based on the model training set and the structural parameters, a three-dimensional geometric model of the high-temperature superheater is obtained.

[0015] On the other hand, based on the three-dimensional geometric model, a corresponding first finite element distribution is obtained, including:

[0016] Based on the three-dimensional geometric model, dividing according to curvature to obtain a geometric area corresponding to each curvature;

[0017] Based on each geometric region and curvature-optimal element size comparison table, the corresponding optimal element size is obtained;

[0018] Based on the optimal unit size corresponding to each geometric region, the corresponding first finite element distribution is obtained.

[0019] On the other hand, based on the load condition of the first boiler of the generator set and the finite element solution model, the preset stress parameters of each finite element unit are obtained, including:

[0020] Based on the load condition of the first boiler of the generator set, obtaining a first load parameter of the high temperature superheater;

[0021] Based on the load parameter and the three-dimensional geometric model, obtain a second load parameter corresponding to each geometric area;

[0022] Input each second load parameter into the finite element solution model in turn to obtain the regional stress parameter corresponding to each geometric region;

[0023] Based on the regional stress parameters and all finite element units in each geometric region, a preset stress parameter corresponding to each finite element unit is obtained.

[0024] On the other hand, the real-time stress parameters of each finite element unit of the high-temperature superheater are obtained, and the finite element units with abnormal stress are subdivided again to obtain the abnormal path and predict the development parameters of the crack, including:

[0025] Acquire the real-time stress parameter and the preset stress parameter of each finite element unit of the high-temperature superheater, and obtain the first difference value corresponding to each finite element unit;

[0026] Based on the first difference and the corresponding reasonable difference, obtaining a second difference greater than the reasonable difference;

[0027] Obtaining first units corresponding to all second difference values, and sequentially inputting them into a mesh refinement model to obtain mesh sizes of corresponding refined first units;

[0028] Perform a second finite element distribution on the corresponding first unit according to each grid size to obtain a corresponding second unit with stress anomaly;

[0029] Based on the second coordinates of all the second units, a set of third units with continuous coordinates and a set of fourth units with discontinuous coordinates are obtained;

[0030] Based on each third unit set, a corresponding first abnormal path is obtained;

[0031] Based on the first coordinate distance between every two fourth units in the fourth unit set, a fifth unit set having a first coordinate distance less than a preset continuity distance is obtained;

[0032] Based on each fifth unit set, a corresponding second abnormal path is obtained;

[0033] Obtaining the abnormal stress of the minimum unit of each first abnormal path and each second abnormal path from the current moment to each moment of a previous monitoring cycle;

[0034] Based on all the abnormal stresses corresponding to each minimum unit, a corresponding abnormal stress curve diagram is constructed;

[0035] Obtain all peak points of each waveform in the abnormal stress curve diagram to obtain a first slope of each peak point;

[0036] Based on all first slopes corresponding to the abnormal stress curve graph, construct a corresponding first slope change graph;

[0037] If the first trends of all first slope change graphs corresponding to the abnormal path are the same, the abnormal path is retained;

[0038] All abnormal stress curves corresponding to the retained abnormal paths are input into the crack propagation model to obtain the corresponding crack development parameters.

[0039] On the other hand, based on the development parameters and the corresponding actual development parameters, the high temperature superheater is optimized, including:

[0040] Obtain the actual development parameters of each abnormal path in a monitoring cycle after the current moment;

[0041] Based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated;

[0042] If the development deviation index is greater than or equal to a preset deviation index, obtaining a corresponding overheating area;

[0043] The three-dimensional geometric model of the overheated area and the corresponding material parameters are sent to an artificial backend to optimize the three-dimensional geometric model.

[0044] On the other hand, based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated, including:

[0045] Where P represents the development deviation index of the abnormal path; n represents the number of finite element units that the abnormal path passes through; x i represents the stress intensity factor in the development parameters of the i-th finite element of the abnormal path; y i represents the stress intensity factor in the actual development parameters of the ith finite element of the abnormal path; γ i The type coefficient representing the stress in the development parameters of the i-th finite element of the abnormal path; ε i The type coefficient representing the stress in the actual development parameters of the i-th finite element of the abnormal path; a i represents the area of ​​the i-th finite element unit of the abnormal path; A represents the sum of the areas of the finite element units through which the abnormal path passes; m represents the material constant of the overheating area where the abnormal path is located; k max k represents the maximum stress intensity factor in the finite element unit through which the abnormal path passes; min Indicates the minimum stress intensity factor in the finite element unit through which the abnormal path passes.

[0046] On the other hand, after obtaining the real-time stress parameters of each finite element unit of the high-temperature superheater, subdividing the finite element units with abnormal stress, obtaining the abnormal path and predicting the development parameters of the crack, it also includes:

[0047] Input the stress cycle data corresponding to each finite element unit of the high-temperature superheater into the life prediction model to obtain the service life of each finite element unit;

[0048] The shortest service life among all finite element units is the service life of the high temperature superheater.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention provides a high-temperature superheater crack analysis method based on finite elements, which is used to construct a three-dimensional geometric model of the high-temperature superheater, divide the finite element units for analysis, and further subdivide the abnormal finite element units for detailed analysis, predict the development of cracks, optimize the high-temperature superheater, improve the accuracy and efficiency of the high-temperature superheater crack analysis, ensure production safety, and extend the service life of the high-temperature superheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 It is a flow chart of a high-temperature superheater crack analysis method based on finite element provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] like Figure 1 As shown, a high temperature superheater crack analysis method based on finite element method is provided in an embodiment of the present invention, comprising:

[0056] Step 1: constructing a three-dimensional geometric model of the high-temperature superheater based on standard parameters of the high-temperature superheater;

[0057] Step 2: Based on the three-dimensional geometric model, obtain a corresponding first finite element distribution;

[0058] Step 3: Based on the load condition of the first boiler of the generator set and the finite element solution model, obtain the preset stress parameters of each finite element unit;

[0059] Step 4: Obtain the real-time stress parameters of each finite element unit of the high-temperature superheater, subdivide the finite element units with abnormal stress, obtain the abnormal path and predict the development parameters of the crack;

[0060] Step 5: Optimize the high temperature superheater based on the development parameters and the corresponding actual development parameters.

[0061] In this embodiment, the standard parameters refer to the structural parameters and material parameters of each superheating area of ​​the high-temperature superheater, wherein the superheating area refers to the area where each superheater in the high-temperature superheater is located, including: screen superheater, ceiling superheater and wall-wrapped superheater, the structural parameters refer to the actual size and structure of the superheater, and the material parameters refer to the physical and mechanical properties of the superheater, such as elastic modulus, Poisson's ratio, thermal expansion coefficient, yield strength, etc.

[0062] In this embodiment, the three-dimensional geometric model refers to a three-dimensional geometric model of the structure of the high-temperature superheater that is obtained by training with standard parameters of the high-temperature superheater.

[0063] In this embodiment, the first finite element distribution refers to the distribution of sizes of units in the three-dimensional geometric model obtained by analyzing the three-dimensional geometric model and performing finite element division on the three-dimensional geometric model.

[0064] In this embodiment, the first boiler refers to a boiler of the power generating set equipped with a high temperature superheater.

[0065] In this embodiment, the load condition refers to the thermal load, mechanical load, etc. when the first boiler operates normally.

[0066] In this embodiment, the finite element solution model refers to a model obtained by training the stress parameters and load parameters of the finite element unit, and is a model that can convert the load parameters into the stress parameters of each finite element unit. The stress parameters refer to stress intensity and stress type.

[0067] In this embodiment, the preset stress parameter refers to the stress parameter of each finite element unit under normal operation of the high-temperature superheater, and the stress parameter refers to the stress intensity and stress type.

[0068] In this embodiment, the real-time stress parameter refers to the stress parameter corresponding to each finite element unit obtained in real time, and the stress parameter refers to the stress intensity and the stress type.

[0069] In this embodiment, the abnormal path refers to a path consisting of finite element units with abnormal stress parameters obtained by analyzing the real-time stress parameters and preset stress parameters of each finite element unit of the high-temperature superheater, which represents a crack.

[0070] In this embodiment, the development parameter refers to a stress parameter of the stress development of each finite element unit of the abnormal path in a monitoring cycle after the current moment, wherein the monitoring cycle refers to a preset cycle for analyzing cracks.

[0071] In this embodiment, the actual development parameter refers to the stress parameter of the stress development of each finite element unit of the abnormal path in a monitoring cycle after the current moment.

[0072] The working principle and beneficial effects of the above technical solution are: by constructing a three-dimensional geometric model of the high-temperature superheater, dividing the finite element units for analysis, and further subdividing the abnormal finite element units for detailed analysis, the development of cracks is predicted, the high-temperature superheater is optimized, and the accuracy and efficiency of the high-temperature superheater crack analysis are improved, production safety is ensured, and the service life of the high-temperature superheater is extended.

[0073] Embodiment 2:

[0074] On the basis of the above-mentioned embodiment 1, based on the standard parameters of the high temperature superheater, a three-dimensional geometric model of the high temperature superheater is constructed, including:

[0075] Based on the standard parameters of the high-temperature superheater, the corresponding structural parameters and material parameters of each superheating area are obtained;

[0076] Constructing a model training set based on the set parameters of each overheating area and the material parameters;

[0077] Based on the model training set and the structural parameters, a three-dimensional geometric model of the high-temperature superheater is obtained.

[0078] In this embodiment, the area where each superheater in the high-temperature superheater in the superheating area is located includes: a screen superheater, a ceiling superheater and a wall-wrapped superheater.

[0079] In this embodiment, the structural parameters refer to the actual size and structure of the superheater.

[0080] In this embodiment, the material parameters refer to the physical and mechanical properties of the superheater, such as elastic modulus, Poisson's ratio, thermal expansion coefficient, yield strength, etc.

[0081] The set parameters refer to the pre-set maximum and minimum values ​​of the temperature distribution for normal operation of each overheating area, the maximum and minimum values ​​of the pressure, constraint conditions, etc.

[0082] In this embodiment, the model training set refers to a data set for training the model that is constructed by setting parameters of each superheating zone of the high-temperature superheater and the material parameters.

[0083] The working principle and beneficial effect of the above technical solution are: by analyzing the standard parameters of the high-temperature superheater, a three-dimensional geometric model of the high-temperature superheater is constructed, which is conducive to accurate analysis of the high-temperature superheater.

[0084] Embodiment 3:

[0085] On the basis of the above-mentioned embodiment 1, based on the three-dimensional geometric model, a corresponding first finite element distribution is obtained, including:

[0086] Based on the three-dimensional geometric model, dividing according to curvature to obtain a geometric area corresponding to each curvature;

[0087] Based on each geometric region and curvature-optimal element size comparison table, the corresponding optimal element size is obtained;

[0088] Based on the optimal unit size corresponding to each geometric region, the corresponding first finite element distribution is obtained.

[0089] In this embodiment, the geometric region refers to dividing the three-dimensional geometric model according to the curvature to obtain the region corresponding to each curvature.

[0090] In this embodiment, the curvature-optimal unit size comparison table refers to a comparison table of each curvature and the size of the corresponding optimal divided finite element unit.

[0091] In this embodiment, the optimal unit size refers to the size of the optimal divided finite element unit corresponding to each curvature in the curvature-optimal unit size comparison table.

[0092] The working principle and beneficial effects of the above technical solution are: by analyzing the three-dimensional geometric model, the corresponding first finite element distribution is obtained, and the three-dimensional collective model is accurately divided into finite element units, which is conducive to accurate analysis of cracks.

[0093] Embodiment 4:

[0094] On the basis of the above-mentioned embodiment 3, based on the load condition of the first boiler of the generator set and the finite element solution model, the preset stress parameters of each finite element unit are obtained, including:

[0095] Based on the load condition of the first boiler of the generator set, obtaining a first load parameter of the high temperature superheater;

[0096] Based on the load parameter and the three-dimensional geometric model, obtain a second load parameter corresponding to each geometric area;

[0097] Input each second load parameter into the finite element solution model in turn to obtain the regional stress parameter corresponding to each geometric region;

[0098] Based on the regional stress parameters and all finite element units in each geometric region, a preset stress parameter corresponding to each finite element unit is obtained.

[0099] In this embodiment, the first load parameter refers to the overall load parameter of the high temperature superheater obtained by analyzing the load parameter.

[0100] In this embodiment, the second load parameter refers to a load parameter of each geometric region obtained by inputting the load parameter into the three-dimensional geometric model for simulation.

[0101] In this embodiment, the finite element solution model refers to a model obtained by training the stress parameters and load parameters of the finite element unit, and is a model that can convert the load parameters into the stress parameters of each finite element unit. The stress parameters refer to stress intensity and stress type.

[0102] In this embodiment, the regional stress parameter refers to inputting each second load parameter into the finite element solution model to obtain the stress parameter corresponding to each geometric region, and the stress parameter refers to the stress intensity and stress type.

[0103] The working principle and beneficial effect of the above technical solution are: by analyzing the load conditions of the first boiler of the generator set and the finite element solution model, the preset stress parameters of each finite element unit are obtained, which is conducive to accurately analyzing the real-time stress parameters.

[0104] Embodiment 5:

[0105] On the basis of the above-mentioned embodiment 1, the real-time stress parameters of each finite element unit of the high-temperature superheater are obtained, and the finite element units with stress abnormalities are further subdivided to obtain abnormal paths and predict crack development parameters, including:

[0106] Acquire the real-time stress parameter and the preset stress parameter of each finite element unit of the high-temperature superheater, and obtain the first difference value corresponding to each finite element unit;

[0107] Based on the first difference and the corresponding reasonable difference, obtaining a second difference greater than the reasonable difference;

[0108] Obtaining first units corresponding to all second difference values, and sequentially inputting them into a mesh refinement model to obtain mesh sizes of corresponding refined first units;

[0109] Perform a second finite element distribution on the corresponding first unit according to each grid size to obtain a corresponding second unit with stress anomaly;

[0110] Based on the second coordinates of all the second units, a set of third units with continuous coordinates and a set of fourth units with discontinuous coordinates are obtained;

[0111] Based on each third unit set, a corresponding first abnormal path is obtained;

[0112] Based on the first coordinate distance between every two fourth units in the fourth unit set, a fifth unit set having a first coordinate distance less than a preset continuity distance is obtained;

[0113] Based on each fifth unit set, a corresponding second abnormal path is obtained;

[0114] Obtaining the abnormal stress of the minimum unit of each first abnormal path and each second abnormal path from the current moment to each moment of a previous monitoring cycle;

[0115] Based on all the abnormal stresses corresponding to each minimum unit, a corresponding abnormal stress curve diagram is constructed;

[0116] Obtain all peak points of each waveform in the abnormal stress curve diagram to obtain a first slope of each peak point;

[0117] Based on all first slopes corresponding to the abnormal stress curve graph, construct a corresponding first slope change graph;

[0118] If the first trends of all first slope change graphs corresponding to the abnormal path are the same, the abnormal path is retained;

[0119] All abnormal stress curves corresponding to the retained abnormal paths are input into the crack propagation model to obtain the corresponding crack development parameters.

[0120] In this embodiment, the first difference refers to the difference between the real-time stress parameter of each finite element unit and the numerical value of the stress intensity in the preset stress parameter.

[0121] In this embodiment, the reasonable difference refers to a preset range of the first difference with a reasonable error.

[0122] In this embodiment, the second difference refers to the first difference within a reasonable difference range.

[0123] In this embodiment, the first unit refers to the finite element unit corresponding to the second difference.

[0124] In this embodiment, the grid refinement model refers to a model obtained by training the grid size and the size of the unit to be divided, and can simulate the most accurate unit division size for the unit to be divided.

[0125] In this embodiment, the grid size refers to the size of the grid divided by the first unit obtained by inputting the first unit into the grid refinement model to obtain the corresponding refinement of the first unit.

[0126] In this embodiment, the second finite element distribution refers to dividing the corresponding first unit into finite element units again according to each grid size.

[0127] In this embodiment, the second unit refers to a finite element unit with stress anomaly and accurate positioning after the first unit is divided.

[0128] In this embodiment, the second coordinate refers to the coordinate of the second unit.

[0129] In this embodiment, the third unit set refers to a set of second units whose coordinates can be continuous.

[0130] In this embodiment, the fourth unit set refers to a set of second units whose coordinates are not continuous.

[0131] In this embodiment, the first abnormal path refers to a path connecting the finite element units in each third unit set.

[0132] In this embodiment, the fourth unit refers to a finite element unit in the fourth unit set.

[0133] In this embodiment, the first coordinate distance refers to the distance between the coordinates of every two fourth units.

[0134] In this embodiment, the preset connection distance refers to a preset distance of coordinates that are not connected but can be counted as connected.

[0135] In this embodiment, the fifth unit set refers to a set of fourth units whose first coordinate distance is less than the preset continuity distance.

[0136] In this embodiment, the second abnormal path refers to a path connecting the finite element units in each fifth unit set.

[0137] In this embodiment, the monitoring period refers to a preset period for analyzing cracks.

[0138] In this embodiment, the abnormal stress refers to the stress parameter of the smallest finite element unit of each first abnormal path and each second abnormal path from the current moment to each moment of the previous monitoring cycle.

[0139] In this embodiment, the abnormal stress curve graph refers to a curve graph in which the numerical values ​​of the stress intensity corresponding to the smallest finite element unit are constructed in time sequence.

[0140] In this embodiment, the peak point refers to the point of the peak value of each waveform in the abnormal stress curve graph.

[0141] In this embodiment, the first slope refers to the slope of a tangent line of the curve at each peak point.

[0142] In this embodiment, the first slope change graph refers to a graph constructed by all first slopes corresponding to the abnormal stress curve graph.

[0143] In this embodiment, the first trend refers to the trend in the first slope change graph, including rising, falling and unchanged.

[0144] In this embodiment, the crack extension model refers to a model trained by the current crack path and future crack extension path.

[0145] The working principle and beneficial effects of the above technical solution are: by analyzing the real-time stress parameters of each finite element unit of the high-temperature superheater, the finite element units with stress abnormalities are further subdivided to obtain the abnormal path and predict the development parameters of the crack, thereby improving the accuracy and efficiency of the high-temperature superheater crack analysis and ensuring production safety.

[0146] Embodiment 6:

[0147] On the basis of the above-mentioned embodiment 2, based on the development parameters and the corresponding actual development parameters, the high temperature superheater is optimized, including:

[0148] Obtain the actual development parameters of each abnormal path in a monitoring cycle after the current moment;

[0149] Based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated;

[0150] If the development deviation index is greater than or equal to a preset deviation index, obtaining a corresponding overheating area;

[0151] The three-dimensional geometric model of the overheated area and the corresponding material parameters are sent to an artificial backend to optimize the three-dimensional geometric model.

[0152] In this embodiment, the development deviation index refers to a numerical value indicating the degree of crack analysis deviation of the high temperature superheater obtained by analyzing the development parameters and actual development parameters of the same abnormal path.

[0153] In this embodiment, the preset deviation index refers to a development deviation index that is preset to have a serious deviation and needs to be manually optimized.

[0154] In this embodiment, the manual backend refers to a backend that is manually controlled.

[0155] The working principle and beneficial effect of the above technical solution are: by analyzing the development parameters and the corresponding actual development parameters, the high-temperature superheater is optimized, the accuracy and efficiency of the high-temperature superheater crack analysis are improved, and the service life of the high-temperature superheater is extended.

[0156] Embodiment 7:

[0157] On the basis of the above-mentioned embodiment 6, based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated, including:

[0158] Where P represents the development deviation index of the abnormal path; n represents the number of finite element units that the abnormal path passes through; x irepresents the stress intensity factor in the development parameters of the i-th finite element of the abnormal path; y i represents the stress intensity factor in the actual development parameters of the ith finite element of the abnormal path; γ i The type coefficient representing the stress in the development parameters of the i-th finite element of the abnormal path; ε i The type coefficient representing the stress in the actual development parameters of the i-th finite element of the abnormal path; a i represents the area of ​​the i-th finite element unit of the abnormal path; A represents the sum of the areas of the finite element units through which the abnormal path passes; m represents the material constant of the overheating area where the abnormal path is located; k max k represents the maximum stress intensity factor in the finite element unit through which the abnormal path passes; min Indicates the minimum stress intensity factor in the finite element unit through which the abnormal path passes.

[0159] In this embodiment, the stress intensity factor refers to a numerical value indicating stress intensity.

[0160] In this embodiment, the type coefficient refers to a coefficient corresponding to a preset type of stress, wherein the type of stress includes: normal stress, shear stress, tensile stress, compressive tension, bending stress, and torsional stress.

[0161] In this embodiment, the material constant refers to the material constant preset based on the superheater.

[0162] The working principle and beneficial effects of the above technical solution are: by analyzing the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated, the effectiveness of the crack analysis is accurately verified, the accuracy and efficiency of the high-temperature superheater crack analysis are improved, and the service life of the high-temperature superheater is extended.

[0163] Embodiment 8:

[0164] On the basis of the above-mentioned embodiment 1, after obtaining the real-time stress parameters of each finite element unit of the high-temperature superheater, subdividing the finite element units with stress abnormalities, obtaining the abnormal paths and predicting the development parameters of the cracks, the method further includes:

[0165] Input the stress cycle data corresponding to each finite element unit of the high-temperature superheater into the life prediction model to obtain the service life of each finite element unit;

[0166] The shortest service life among all finite element units is the service life of the high temperature superheater.

[0167] In this embodiment, the stress cycle data refers to data including the number of times stress abnormalities occur and stress parameters of each abnormality.

[0168] In this embodiment, the life prediction model refers to a model trained by stress cycle data, which can predict the service life of the high-temperature superheater.

[0169] The working principle and beneficial effects of the above technical solution are: by analyzing the stress cycle data of each finite element unit, the service life of the high-temperature superheater is predicted, the accuracy and efficiency of the high-temperature superheater crack analysis are improved, production safety is ensured, and the service life of the high-temperature superheater is extended.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high temperature superheater crack analysis method based on finite element, characterized in that: include: Step 1: constructing a three-dimensional geometric model of the high-temperature superheater based on standard parameters of the high-temperature superheater; Step 2: Based on the three-dimensional geometric model, obtain a corresponding first finite element distribution; Step 3: Based on the load condition of the first boiler of the generator set and the finite element solution model, obtain the preset stress parameters of each finite element unit; Step 4: Obtain the real-time stress parameters of each finite element unit of the high-temperature superheater, subdivide the finite element units with abnormal stress, obtain the abnormal path and predict the development parameters of the crack; Step 5: Optimize the high temperature superheater based on the development parameters and the corresponding actual development parameters.

2. A high temperature superheater crack analysis method based on finite element according to claim 1, characterized in that: Based on the standard parameters of the high temperature superheater, a three-dimensional geometric model of the high temperature superheater is constructed, including: Based on the standard parameters of the high-temperature superheater, the corresponding structural parameters and material parameters of each superheating area are obtained; Constructing a model training set based on the set parameters of each overheating area and the material parameters; Based on the model training set and the structural parameters, a three-dimensional geometric model of the high-temperature superheater is obtained.

3. The high temperature superheater crack analysis method based on finite element according to claim 1 is characterized in that: Based on the three-dimensional geometric model, a corresponding first finite element distribution is obtained, including: Based on the three-dimensional geometric model, dividing according to curvature to obtain a geometric area corresponding to each curvature; Based on each geometric region and curvature-optimal element size comparison table, the corresponding optimal element size is obtained; Based on the optimal unit size corresponding to each geometric region, the corresponding first finite element distribution is obtained.

4. The high temperature superheater crack analysis method based on finite element according to claim 3 is characterized in that: Based on the load condition of the first boiler of the generator set and the finite element solution model, the preset stress parameters of each finite element unit are obtained, including: Based on the load condition of the first boiler of the generator set, obtaining a first load parameter of the high temperature superheater; Based on the load parameter and the three-dimensional geometric model, obtain a second load parameter corresponding to each geometric area; Input each second load parameter into the finite element solution model in turn to obtain the regional stress parameter corresponding to each geometric region; Based on the regional stress parameters and all finite element units in each geometric region, a preset stress parameter corresponding to each finite element unit is obtained.

5. The high temperature superheater crack analysis method based on finite element according to claim 1, characterized in that: Obtain the real-time stress parameters of each finite element unit of the high-temperature superheater, subdivide the finite element units with abnormal stress, obtain the abnormal path and predict the development parameters of the crack, including: Acquire the real-time stress parameter and the preset stress parameter of each finite element unit of the high-temperature superheater, and obtain the first difference value corresponding to each finite element unit; Based on the first difference and the corresponding reasonable difference, obtaining a second difference greater than the reasonable difference; Obtaining first units corresponding to all second difference values, and sequentially inputting them into a mesh refinement model to obtain mesh sizes of corresponding refined first units; Perform a second finite element distribution on the corresponding first unit according to each grid size to obtain a corresponding second unit with stress anomaly; Based on the second coordinates of all the second units, a set of third units with continuous coordinates and a set of fourth units with discontinuous coordinates are obtained; Based on each third unit set, a corresponding first abnormal path is obtained; Based on the first coordinate distance between every two fourth units in the fourth unit set, a fifth unit set having a first coordinate distance less than a preset continuity distance is obtained; Based on each fifth unit set, a corresponding second abnormal path is obtained; Obtaining the abnormal stress of the minimum unit of each first abnormal path and each second abnormal path from the current moment to each moment of a previous monitoring cycle; Based on all the abnormal stresses corresponding to each minimum unit, a corresponding abnormal stress curve diagram is constructed; Obtain all peak points of each waveform in the abnormal stress curve diagram to obtain a first slope of each peak point; Based on all first slopes corresponding to the abnormal stress curve graph, construct a corresponding first slope change graph; If the first trends of all first slope change graphs corresponding to the abnormal path are the same, the abnormal path is retained; All abnormal stress curves corresponding to the retained abnormal paths are input into the crack propagation model to obtain the corresponding crack development parameters.

6. The high temperature superheater crack analysis method based on finite element according to claim 2 is characterized in that: Based on the development parameters and the corresponding actual development parameters, the high temperature superheater is optimized, including: Obtain the actual development parameters of each abnormal path in a monitoring cycle after the current moment; Based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated; If the development deviation index is greater than or equal to a preset deviation index, obtaining a corresponding overheating area; The three-dimensional geometric model of the overheated area and the corresponding material parameters are sent to an artificial backend to optimize the three-dimensional geometric model.

7. The high temperature superheater crack analysis method based on finite element according to claim 6 is characterized in that: Based on the development parameters of the same abnormal path and the actual development parameters, the corresponding development deviation index is calculated, including: Where P represents the development deviation index of the abnormal path; n represents the number of finite element units that the abnormal path passes through; x i represents the stress intensity factor in the development parameters of the i-th finite element of the abnormal path; y i represents the stress intensity factor in the actual development parameters of the ith finite element of the abnormal path; γ i The type coefficient representing the stress in the development parameters of the i-th finite element of the abnormal path; ε i The type coefficient representing the stress in the actual development parameters of the i-th finite element of the abnormal path; a i represents the area of ​​the i-th finite element unit of the abnormal path; A represents the sum of the areas of the finite element units through which the abnormal path passes; m represents the material constant of the overheating area where the abnormal path is located; k max k represents the maximum stress intensity factor in the finite element unit through which the abnormal path passes; min Indicates the minimum stress intensity factor in the finite element unit through which the abnormal path passes.

8. The high temperature superheater crack analysis method based on finite element according to claim 1, characterized in that: After obtaining the real-time stress parameters of each finite element unit of the high-temperature superheater, subdividing the finite element units with abnormal stress, obtaining the abnormal path and predicting the development parameters of the crack, it also includes: Input the stress cycle data corresponding to each finite element unit of the high-temperature superheater into the life prediction model to obtain the service life of each finite element unit; The shortest service life among all finite element units is the service life of the high temperature superheater.

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