A method, device and electronic device for detecting life loss of heat exchange equipment

Abstract

The present application provides a method, device and electronic device for detecting the life loss of heat exchange equipment. The method includes: defining multiple test nodes in the heat exchange equipment to be detected, obtaining the geometric structure parameters and material characteristic parameters of each test node; for any test node, based on the conservation principle of the heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, constructing a hybrid simulation model of the test node; based on the hybrid simulation model of each test node, according to the current working condition indicators of each test node, real-time monitoring of the life loss evaluation index of each test node; according to the life loss evaluation index of each test node, determining the life loss detection result of the heat exchange equipment. By real-time monitoring of the life loss evaluation index of different test nodes of the heat exchange equipment based on the hybrid simulation model, the transient operation characteristics of each test node of the heat exchange equipment are obtained, ensuring the accuracy of the life loss detection result of the heat exchange equipment finally determined.

Description

Technical Field

[0001] The present application relates to the technical field of equipment monitoring of thermal power generating sets, and in particular to a method, device and electronic equipment for detecting life loss of heat exchange equipment. Background Art

[0002] At present, most power plants use renewable energy for large-scale grid-connected power generation. However, due to the significant anti-peaking characteristics and unpredictability of renewable energy, it is necessary to provide peaking services based on coal-fired units for renewable energy consumption. However, the deep peaking operation of coal-fired units will accelerate the life loss of the unit's heat exchange equipment, so how to detect the life loss of the unit's heat exchange equipment has become a hot issue.

[0003] In the prior art, the life loss of the heat exchange equipment is usually determined based on elastic mechanics according to some steady-state parameters of the heat exchange equipment, such as the average wall temperature of the whole machine, but the accuracy of the life loss determination result cannot be guaranteed. Summary of the invention

[0004] The present application provides a method, device and electronic equipment for detecting the life loss of heat exchange equipment to solve the defects of the prior art that the accuracy of the life loss determination result cannot be guaranteed.

[0005] The first aspect of the present application provides a method for detecting life loss of heat exchange equipment, comprising:

[0006] Define multiple test nodes in the heat exchange device to be tested, and obtain geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters represent the morphological structure information of the test node, and the material characteristic parameters represent the property information of the constituent materials of the test node;

[0007] For any of the test nodes, based on the conservation principle of the heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each of the test nodes, a hybrid simulation model of the test node is constructed;

[0008] Based on the hybrid simulation model of each of the test nodes, and according to the current working condition indicators of each of the test nodes, the life loss evaluation indicators of each of the test nodes are monitored in real time;

[0009] The life loss detection result of the heat exchange equipment is determined according to the life loss evaluation index of each test node.

[0010] Optionally, based on the conservation principle of the heat exchange device and according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed, including:

[0011] Based on the conservation principle of the heat exchange equipment, and according to the geometric structure parameters and material characteristic parameters of each test node, a mechanism model of the test node is constructed;

[0012] Inputting the measured value of the working condition index of the test node into the mechanism model to obtain the simulated value of the life loss index output by the mechanism model;

[0013] Constructing a mathematical model of the test node according to a deviation between the simulated value of the life loss index and the actual measured value of the life loss index of the test node;

[0014] The mechanism model and the mathematical model of the test node are coupled to obtain a hybrid simulation model of the test node.

[0015] Optionally, the hybrid simulation model based on each of the test nodes monitors the life loss evaluation index of each of the test nodes in real time according to the current working condition index of each of the test nodes, including:

[0016] For any of the test nodes, the current operating condition index of the test node is input into the mechanism model to obtain a corresponding life loss index simulation value;

[0017] Inputting the current working condition index of the test node into the mathematical model to obtain the current simulation deviation of the mechanism model;

[0018] According to the life loss indicator simulation value and the current simulation deviation, the current monitoring result of the life loss evaluation indicator of the test node is determined.

[0019] Optionally, determining the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node includes:

[0020] Determining a life loss evaluation result of each of the test nodes according to the life loss evaluation index of each of the test nodes;

[0021] The life loss detection result of the heat exchange equipment is determined according to the life loss evaluation result of each of the test nodes.

[0022] Optionally, determining the life loss evaluation result of each test node according to the life loss evaluation index of each test node includes:

[0023] For any of the test nodes, determine the creep life loss and fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node;

[0024] The life loss evaluation result of the test node is determined according to the accumulated results of the creep life loss and the fatigue life loss of the test node.

[0025] Optionally, determining the creep life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node includes:

[0026] Determine the current pipe wall creep stress of the test node according to the current steam pressure, pipe inner diameter and pipe wall thickness of the test node;

[0027] Determine the current creep rupture time of the test node according to the current temperature of the test node, the current pipe wall creep stress and the material characteristic parameter;

[0028] Determining the creep life loss of the test node according to the creep rupture time data of the test node during the entire operation cycle of the heat exchange device;

[0029] The life loss index includes the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

[0030] Optionally, determining the fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node includes:

[0031] Determine the current fatigue mechanical stress of the test node according to the current steam pressure, the inner diameter of the pipe and the wall thickness of the pipe at the test node;

[0032] Determine the thermal stress of the test node according to the linear expansion coefficient, elastic modulus, Poisson coefficient, inner and outer wall temperature difference and geometric structure parameters of the test node;

[0033] Determining the current fatigue composite stress of the test node according to the current fatigue mechanical stress and thermal stress;

[0034] Determine the maximum full-cycle and half-cycle cycle times of the test node according to the fatigue composite stress data of the test node during the entire operation cycle of the heat exchange device;

[0035] Determine the fatigue life loss of the test node according to the maximum full cycle number and the maximum half cycle number of the test node;

[0036] The life loss index includes the current steam pressure and the temperature difference between the inner and outer walls, the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall, and the material characteristic parameters include the linear expansion coefficient, elastic modulus and Poisson's coefficient.

[0037] A second aspect of the present application provides a device for detecting the life loss of a heat exchange device, comprising:

[0038] An acquisition module, used to define a plurality of test nodes in the heat exchange device to be tested, and acquire geometric structure parameters and material characteristic parameters of each of the test nodes; wherein the geometric structure parameters represent the morphological structure information of the test node, and the material characteristic parameters represent the property information of the constituent materials of the test node;

[0039] A model building module, for building a hybrid simulation model of any of the test nodes based on the conservation principle of the heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each of the test nodes;

[0040] A monitoring module, for monitoring the life loss evaluation index of each test node in real time based on the hybrid simulation model of each test node and according to the current working condition index of each test node;

[0041] The determination module is used to determine the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node.

[0042] Optionally, the model building module is specifically used to:

[0043] Based on the conservation principle of the heat exchange equipment, and according to the geometric structure parameters and material characteristic parameters of each test node, a mechanism model of the test node is constructed;

[0044] Inputting the measured value of the working condition index of the test node into the mechanism model to obtain the simulated value of the life loss index output by the mechanism model;

[0045] Constructing a mathematical model of the test node according to a deviation between the simulated value of the life loss index and the actual measured value of the life loss index of the test node;

[0046] The mechanism model and the mathematical model of the test node are coupled to obtain a hybrid simulation model of the test node.

[0047] Optionally, the monitoring module is specifically used to:

[0048] For any of the test nodes, the current operating condition index of the test node is input into the mechanism model to obtain a corresponding life loss index simulation value;

[0049] Inputting the current working condition index of the test node into the mathematical model to obtain the current simulation deviation of the mechanism model;

[0050] According to the life loss indicator simulation value and the current simulation deviation, the current monitoring result of the life loss evaluation indicator of the test node is determined.

[0051] Optionally, the determining module is specifically used to:

[0052] Determining a life loss evaluation result of each of the test nodes according to the life loss evaluation index of each of the test nodes;

[0053] The life loss detection result of the heat exchange equipment is determined according to the life loss evaluation result of each of the test nodes.

[0054] Optionally, the determining module is specifically used to:

[0055] For any of the test nodes, determine the creep life loss and fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node;

[0056] The life loss evaluation result of the test node is determined according to the accumulated results of the creep life loss and the fatigue life loss of the test node.

[0057] Optionally, the determining module is specifically used to:

[0058] Determine the current pipe wall creep stress of the test node according to the current steam pressure, pipe inner diameter and pipe wall thickness of the test node;

[0059] Determine the current creep rupture time of the test node according to the current temperature of the test node, the current pipe wall creep stress and the material characteristic parameter;

[0060] Determining the creep life loss of the test node according to the creep rupture time data of the test node during the entire operation cycle of the heat exchange device;

[0061] The life loss index includes the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

[0062] Optionally, the determining module is specifically used to:

[0063] Determine the current fatigue mechanical stress of the test node according to the current steam pressure, the inner diameter of the pipe and the wall thickness of the pipe at the test node;

[0064] Determine the thermal stress of the test node according to the linear expansion coefficient, elastic modulus, Poisson coefficient, inner and outer wall temperature difference and geometric structure parameters of the test node;

[0065] Determining the current fatigue composite stress of the test node according to the current fatigue mechanical stress and thermal stress;

[0066] Determine the maximum full-cycle and half-cycle cycle times of the test node according to the fatigue composite stress data of the test node during the entire operation cycle of the heat exchange device;

[0067] Determine the fatigue life loss of the test node according to the maximum full cycle number and the maximum half cycle number of the test node;

[0068] The life loss index includes the current steam pressure and the temperature difference between the inner and outer walls, the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall, and the material characteristic parameters include the linear expansion coefficient, elastic modulus and Poisson's coefficient.

[0069] A third aspect of the present application provides an electronic device, comprising: at least one processor and a memory;

[0070] The memory stores computer-executable instructions;

[0071] The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method described in the first aspect and various possible designs of the first aspect.

[0072] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When a processor executes the computer-executable instructions, the method described in the first aspect and various possible designs of the first aspect are implemented.

[0073] The technical solution of this application has the following advantages:

[0074] The present application provides a method, device and electronic device for detecting the life loss of heat exchange equipment, the method comprising: defining multiple test nodes in the heat exchange equipment to be detected, obtaining the geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters characterize the morphological structure information of the test node, and the material characteristic parameters characterize the property information of the material constituting the test node; for any test node, based on the conservation principle of the heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, construct a hybrid simulation model of the test node; based on the hybrid simulation model of each test node, according to the current working condition index of each test node, monitor the life loss evaluation index of each test node in real time; according to the life loss evaluation index of each test node, determine the life loss detection result of the heat exchange equipment. The method provided by the above scheme obtains the transient operation characteristics of each test node of the heat exchange equipment by real-time monitoring the life loss evaluation index of different test nodes of the heat exchange equipment based on the hybrid simulation model, thereby ensuring the accuracy of the life loss detection result of the heat exchange equipment finally determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0076] Figure 1 This is a schematic diagram of the structure of the heat exchange equipment life loss detection system based on the embodiment of the present application;

[0077] Figure 2 A schematic diagram of a process for detecting the life loss of heat exchange equipment provided in an embodiment of the present application;

[0078] Figure 3 A schematic diagram of the structure of a hybrid simulation model provided in an embodiment of the present application;

[0079] Figure 4 A schematic diagram of the overall process of the heat exchange equipment life loss detection method provided in an embodiment of the present application;

[0080] Figure 5 A schematic diagram of the structure of a heat exchange equipment life loss detection device provided in an embodiment of the present application;

[0081] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0082] The above drawings have shown clear embodiments of the present application, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the following embodiments, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0085] In the prior art, the life loss of the heat exchange equipment is usually determined based on elastic mechanics according to some steady-state parameters of the heat exchange equipment, such as the average wall temperature of the whole machine, but the accuracy of the life loss determination result cannot be guaranteed.

[0086] In response to the above problems, the heat exchange equipment life loss detection method, device and electronic device provided in the embodiments of the present application, by defining multiple test nodes in the heat exchange equipment to be detected, obtain the geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters characterize the morphological structure information of the test node, and the material characteristic parameters characterize the property information of the constituent materials of the test node; for any test node, based on the conservation principle of the heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed; based on the hybrid simulation model of each test node, according to the current working condition indicators of each test node, the life loss evaluation index of each test node is monitored in real time; according to the life loss evaluation index of each test node, the life loss detection result of the heat exchange equipment is determined. The method provided by the above scheme obtains the transient operation characteristics of each test node of the heat exchange equipment by real-time monitoring the life loss evaluation index of different test nodes of the heat exchange equipment based on the hybrid simulation model, thereby ensuring the accuracy of the life loss detection result of the heat exchange equipment finally determined.

[0087] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0088] First, the structure of the heat exchange equipment life loss detection system based on this application is described:

[0089] The heat exchange equipment life loss detection method, device and electronic equipment provided in the embodiments of the present application are suitable for detecting the life loss of heat exchange equipment such as boiler superheaters and steam turbine regenerative heaters. Figure 1 The figure shows a schematic diagram of the structure of the heat exchange equipment life loss detection system based on the embodiment of the present application, which mainly includes the heat exchange equipment to be detected, the data acquisition device and the heat exchange equipment life loss detection device. Specifically, the current operating condition index of the heat exchange equipment can be collected based on the data acquisition device, and the collected current operating condition index is sent to the heat exchange equipment life loss detection device. The heat exchange equipment life loss detection device determines the life loss detection result of the heat exchange equipment based on the hybrid simulation model constructed in advance and the current operating condition index of the heat exchange equipment.

[0090] The embodiment of the present application provides a method for detecting the life loss of heat exchange equipment, which is used to detect the life loss of heat exchange equipment of a coal-fired power generation unit in real time. The execution subject of the embodiment of the present application is an electronic device, such as a server, a desktop computer, a laptop computer, a tablet computer, and other electronic devices that can be used to perform data analysis on the working condition indicators of the heat exchange equipment.

[0091] like Figure 2 FIG. 1 is a flow chart of a method for detecting life loss of a heat exchange device provided in an embodiment of the present application, the method comprising:

[0092] Step 201: define multiple test nodes in the heat exchange equipment to be tested, and obtain geometric structure parameters and material characteristic parameters of each test node.

[0093] Among them, the geometric structure parameters represent the morphological structure information of the test node, and the material property parameters represent the property information of the constituent materials of the test node.

[0094] Specifically, the heat exchange equipment can be divided into several test nodes according to the flow direction of the working medium. Specifically, multiple test nodes can be defined on the heat exchange pipe of the heat exchange equipment, that is, the heat exchange pipe is divided into multiple test nodes.

[0095] Step 202: for any test node, based on the conservation principle of heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed.

[0096] Specifically, a corresponding hybrid simulation model can be constructed for each test node. Specifically, based on the digital twin technology, a hybrid simulation model of each test node can be constructed to output simulation indicators of the corresponding test node based on the hybrid simulation model.

[0097] Step 203 , based on the hybrid simulation model of each test node and according to the current working condition indicator of each test node, the life loss evaluation indicator of each test node is monitored in real time.

[0098] Among them, the current operating condition indicators may include operating condition indicators such as unit load and peak load depth, and the current operating condition indicators of each test node may be unified as the current operating condition indicators of the heat exchange equipment.

[0099] Specifically, for any test node, the current operating condition index of the test node can be input into the corresponding hybrid simulation model, so as to perform corresponding simulation calculation based on the hybrid simulation model to obtain the corresponding life loss evaluation index, wherein the life loss evaluation index may include the current steam pressure and the current temperature, etc.

[0100] Step 204: Determine the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node.

[0101] Specifically, the life loss evaluation index of each test node can be used as a boundary condition for calculating the life loss of the heat exchange equipment, thereby determining the life loss detection result of the heat exchange equipment.

[0102] Based on the above embodiment, as an implementable manner, based on the above embodiment, in one embodiment, based on the conservation principle of heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed, including:

[0103] Step 2021, based on the conservation principle of heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, construct a mechanism model of the test node;

[0104] Step 2022, inputting the measured value of the working condition index of the test node into the mechanism model to obtain the simulated value of the life loss index output by the mechanism model;

[0105] Step 2023, constructing a mathematical model of the test node according to the deviation between the simulated value of the life loss index and the measured value of the life loss index of the test node;

[0106] Step 2024, coupling the mechanism model and the mathematical model of the test node to obtain a hybrid simulation model of the test node.

[0107] It should be noted that the conservation principles of heat exchange equipment include the principle of conservation of mass, the principle of conservation of energy and the principle of conservation of momentum.

[0108] Among them, the principle of conservation of mass is as follows:

[0109]

[0110] Among them, V i Indicates the control volume of test node i, unit: m 3 ρ i Indicates the working fluid density in test node i, unit: kg / m 3 ; t represents the time scale of data collection, unit: s; Indicates the inlet flow of test node i, unit: kg / s; Indicates the test node outlet flow, unit: kg / s.

[0111] The principle of conservation of energy is as follows:

[0112]

[0113] Among them, h i-1 Indicates the specific enthalpy of the working fluid at the test node inlet, unit: kJ / kg; h iis the specific enthalpy of the working fluid at the test node outlet, unit: kJ / kg; Z i-1 is the test node entrance height, unit: m; Z i is the test node exit height, unit: m; g is the gravitational acceleration, unit: N / kg; q i It is the heat transfer between the test node and the metal, unit: kW.

[0114] The principle of conservation of momentum is as follows:

[0115]

[0116] Among them, p i-1 represents the steam pressure at test node i-1, p i Indicates the steam pressure of test node i, unit: MPa; D i-1 Represents the admittance between test node i-1 and test node i.

[0117] The formula for calculating admittance is as follows:

[0118]

[0119] Where A represents the flow area, unit: m 2 , C tr Indicates the surface resistance factor, unit: MPa ms 2 / kg; K tr is the local resistance factor, unit: MPa ms 2 / kg; D h Indicates hydraulic diameter, unit: m; L n is the pipe length, unit: m.

[0120] It should be noted that the wall temperature of the metal tube is a very important indicator in the life loss assessment. Based on the mechanism model provided in the embodiment of the present application, an energy equation for calculating the wall temperature change can be obtained, which is specifically:

[0121]

[0122] q hot,i =h hot,i ·A hot,i ·(T hot,i -T m,i )

[0123] q cold,i =h cold,i ·A cold,i ·(T m,i -T cold,i )

[0124] Among them, M iIndicates the metal mass in the test node i, unit: kg; c m is the specific heat capacity of the metal in the test node, unit: kJ / (kg℃); T m,i Indicates the metal temperature in the test node, unit: °C; q hot,i ,q cold,i It is the heat exchange power between hot medium and metal, and between metal and cold medium, unit: kW; h hot,i 、h cold,i It is the heat transfer coefficient between hot medium, cold medium and metal, unit: kW / (m 2 ℃); A hot,i , A cold,i It is the heat exchange area between hot medium, cold medium and metal, unit: m 2 ; T hot,i , T cold,i It is the temperature of the hot working fluid and the cold working fluid, which can be obtained by looking up the physical property table according to the steam pressure and enthalpy value, unit: ℃.

[0125] Specifically, based on the above-mentioned conservation principle and the energy equation for calculating the wall temperature change, combined with the geometric structure parameters and material property parameters of each test node, a mechanism model that can be used for mechanism simulation of the test node can be constructed. Further, the relevant parameters of the actual operation of the corresponding test node, such as the measured values ​​of the operating conditions such as the unit load and the peak-shaving depth, are input into the mechanism model to obtain a set of simulated values ​​of the life loss index output by the mechanism model. Then, by comparing the simulated value of the life loss index with the measured value of the life loss index of the test node, the simulation deviation of the mechanism model is determined. Then, this deviation value is used as the output of the mathematical model, and the nonlinear autoregressive average model is used to determine the structural parameters of the mathematical model through the product moment matrix method, and the least squares support vector machine is used for regression analysis to identify the nonlinear function. After training and testing, the relationship function between the operating conditions such as the unit load and the peak-shaving depth and the simulation deviation of the mechanism model is obtained to construct the mathematical model of the test node. Finally, the mechanism model and the mathematical model are coupled to eliminate the simulation deviation of the mechanism model using the mathematical model.

[0126] It should be noted that the digital twin technology used in constructing the hybrid simulation model in the embodiment of the present application can make full use of the mathematical model and the mechanism model to complement each other, which not only utilizes the mechanism knowledge and process data, but also reduces the modeling error and improves the simulation accuracy. The comprehensive application of mechanism modeling and mathematical modeling enables the hybrid simulation model to have good generalization ability and can better reflect the life cycle process of the heat exchange equipment. This feature is well suited for the life loss calculation of coal-fired power generation heat exchange equipment. Therefore, from the perspective of data interaction and improving simulation accuracy, a hybrid simulation model of heat exchange equipment is established for the calculation and evaluation of life loss, providing guidance for the life evaluation of coal-fired unit equipment, so as to further improve the safety of peak-shaving operation of coal-fired units.

[0127] Furthermore, in one embodiment, for any test node, the current operating condition index of the test node can be input into the mechanism model to obtain the corresponding life loss index simulation value; the current operating condition index of the test node can be input into the mathematical model to obtain the current simulation deviation of the mechanism model; based on the life loss index simulation value and the current simulation deviation, the current monitoring result of the life loss assessment index of the test node is determined.

[0128] For example, Figure 3 As shown, it is a structural schematic diagram of the hybrid simulation model provided in an embodiment of the present application, in which the mathematical model and the mechanism model are connected in parallel, that is, the mathematical model is used to compensate for the simulation deviation of the mechanism model, realize simulation deviation estimation and correction, and finally the output of the hybrid simulation model is an effective superposition of the mechanism model output and the mathematical model output, that is, the life loss index simulation value of the mechanism model output plus the current simulation deviation calculated by the relationship function in the mathematical model is taken as the output of the hybrid simulation model, that is, the current monitoring result of the life loss evaluation index of the test node is determined.

[0129] Based on the above embodiment, as an implementable manner, based on the above embodiment, in one embodiment, according to the life loss evaluation index of each test node, the life loss detection result of the heat exchange equipment is determined, including:

[0130] Step 2041, determining a life loss evaluation result of each test node according to the life loss evaluation index of each test node;

[0131] Step 2042: Determine the life loss detection result of the heat exchange equipment according to the life loss evaluation result of each test node.

[0132] Specifically, according to the life loss evaluation results of each test node, the target test node with the most serious life loss can be located among many test nodes, and then the life loss detection result of the heat exchange equipment can be determined according to the life loss evaluation result of the target test node. Specifically, the life loss evaluation result of the target test node can be determined as the life loss detection result of the heat exchange equipment, and it can be determined whether to alarm according to the life loss detection result, so as to remind the operation and maintenance personnel to screen the early warning information and detect the equipment.

[0133] Specifically, in one embodiment, for any test node, the creep life loss and fatigue life loss of the test node can be determined based on the life loss index, geometric structure parameters and material characteristic parameters of the test node; and the life loss evaluation result of the test node can be determined based on the cumulative results of the creep life loss and fatigue life loss of the test node.

[0134] Specifically, in one embodiment, the current pipe wall creep stress of the test node can be determined based on the current steam pressure, inner pipe diameter and wall thickness of the test node; the current creep rupture time of the test node can be determined based on the current temperature, current pipe wall creep stress and material characteristic parameters of the test node; and the creep life loss of the test node can be determined based on the creep rupture time data of the test node during the entire operating cycle of the heat exchanger.

[0135] Among them, the life loss indicators include the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

[0136] Specifically, the current pipe wall creep stress of the test node can be calculated based on the following formula:

[0137]

[0138] Among them, σ r It represents the current creep stress of the pipe wall, P represents the current steam pressure of the test node, unit: MPa; D represents the inner diameter of the pipe, unit: mm; δ represents the thickness of the pipe wall, unit: mm.

[0139] According to the Lorsan-Miller formula, the current creep rupture time of the constituent metal of the test node under the current temperature and current pipe wall creep stress can be obtained:

[0140]

[0141] Among them, lgτ represents the current creep rupture time, T represents the current temperature, and C, C0, C1, C2, and C3 represent the influence coefficients of the material characteristic parameters of the test node on the calculation of the creep rupture time.

[0142] According to Robinson's law, the creep life loss of the metal tube is obtained by calculating the operating time and creep rupture time of the test node at various temperatures during the entire operating cycle of the heat exchange equipment, that is, the creep life loss of the test node. Taking into account various life loss factors during the unit's startup, shutdown, peak load regulation, and variable load operation, the calculation result can be multiplied by the correction coefficient K = 1.2:

[0143]

[0144] Among them, φ creep represents the creep life loss of the test node, τ i Indicates the operating time at the corresponding temperature.

[0145] Accordingly, in one embodiment, the current fatigue mechanical stress of the test node can be determined according to the current steam pressure, inner tube diameter and tube wall thickness of the test node; the thermal stress of the test node can be determined according to the linear expansion coefficient, elastic modulus, Poisson's coefficient, inner and outer wall temperature difference and geometric structure parameters of the test node; the current fatigue composite stress of the test node can be determined according to the current fatigue mechanical stress and thermal stress; the maximum full cycle times and half cycle times of the test node can be determined according to the fatigue composite stress data of the test node during the entire operating cycle of the heat exchanger; the fatigue life loss of the test node can be determined according to the maximum full cycle times and half cycle times of the test node.

[0146] Among them, the life loss indicators include the current steam pressure and the temperature difference between the inner and outer walls, the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall, and the material property parameters include the linear expansion coefficient, elastic modulus and Poisson's coefficient.

[0147] Specifically, the current fatigue mechanical stress of the test node can be calculated based on the following formula:

[0148]

[0149] Among them, σ p It represents the current fatigue mechanical stress, P represents the current steam pressure of the test node, unit: MPa; D represents the inner diameter of the pipe, unit: mm; δ represents the pipe wall thickness, unit: mm.

[0150] Furthermore, the thermal stress of the test node can be calculated based on the following formula:

[0151]

[0152] Among them, σ trepresents thermal stress, f(β) represents the influence coefficient of the geometric structure parameters of the test node on the thermal stress calculation, a represents the linear expansion coefficient, unit: 1 / ℃; E represents the elastic modulus, unit: MPa; v represents the Poisson coefficient; Δt is the temperature difference between the inner and outer walls, unit: ℃;

[0153] Furthermore, the current fatigue composite stress of the test node can be calculated based on the following formula:

[0154] σ s =K p σ p +K t σ t

[0155] Among them, σ s Indicates the current fatigue composite stress, K p Indicates the concentration factor of fatigue mechanical stress, K t Represents the concentration factor of thermal stress.

[0156] Furthermore, based on the rain flow method, the fatigue composite stress data corresponding to four adjacent time layers can be grouped together to determine the full cycle cumulative amount and half cycle cumulative amount of the test node in the entire operation cycle of the heat exchanger, as well as the full cycle cyclic stress amplitude corresponding to each full cycle and the half cycle cyclic stress amplitude corresponding to each half cycle. Among them, if the fatigue composite stress change trend in the four time layers is increase → decrease → increase → decrease or decrease → increase → decrease → increase, it indicates that the four time layers correspond to a full cycle, and other cases correspond to a half cycle. The full cycle cyclic stress amplitude / half cycle cyclic stress amplitude refers to the difference between the maximum fatigue composite stress and the minimum fatigue composite stress in a full cycle / half cycle.

[0157] Furthermore, based on a preset polynomial function, the maximum number of full-cycle cycles and the maximum number of half-cycle cycles can be determined according to the cyclic stress amplitudes of each full cycle and each half-cycle, and finally the fatigue life loss of the test node can be calculated based on the following formula:

[0158]

[0159] Among them, φ fatigue Indicates fatigue life loss, N iq Indicates the maximum number of cycles of the whole cycle, N jq Indicates the maximum number of half-cycle cycles, i ranges from 1 to the full cycle cumulative amount, and j ranges from 1 to the half-cycle cumulative amount.

[0160] Further, in one embodiment, the life loss evaluation result φ of the test node can be determined based on the following formula: total :

[0161] φ total =φfatigue +φ creep

[0162] Specifically, in one embodiment, in order to facilitate the construction of the above hybrid simulation model, the equipment in the coal-fired power generation unit can be classified in advance according to the KKS code of each equipment to distinguish which equipment is a heat exchange equipment, and the geometric structure parameters and material characteristic parameters of each heat exchange equipment are input to establish an equipment database. When it is necessary to build a hybrid simulation model of a heat exchange equipment, the geometric structure parameters and material characteristic parameters of the heat exchange equipment can be extracted by inputting the KKS code into the equipment database.

[0163] For example, Figure 4 As shown, it is a schematic diagram of the overall process of the heat exchange equipment life loss detection method provided in the embodiment of the present application, such as Figure 4 The method shown is as follows Figure 2 The method shown is an exemplary implementation, and the implementation principles of the two are the same and will not be described in detail.

[0164] The heat exchange equipment life loss detection method provided in the embodiment of the present application is to define multiple test nodes in the heat exchange equipment to be detected, and obtain the geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters characterize the morphological structure information of the test node, and the material characteristic parameters characterize the property information of the material constituting the test node; for any test node, based on the conservation principle of the heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed; based on the hybrid simulation model of each test node, according to the current working condition index of each test node, the life loss evaluation index of each test node is monitored in real time; according to the life loss evaluation index of each test node, the life loss detection result of the heat exchange equipment is determined. The method provided by the above scheme obtains the transient operation characteristics of each test node of the heat exchange equipment by real-time monitoring the life loss evaluation index of different test nodes of the heat exchange equipment based on the hybrid simulation model, thereby ensuring the accuracy of the life loss detection result of the heat exchange equipment finally determined. In addition, by coupling the mechanism model and the mathematical model to construct the hybrid simulation model, the simulation accuracy is further improved, which lays a foundation for further improving the accuracy of the life loss detection result.

[0165] An embodiment of the present application provides a device for detecting the life loss of a heat exchanger, which is used to execute the method for detecting the life loss of a heat exchanger provided in the above embodiment.

[0166] like Figure 5 , which is a schematic diagram of the structure of a heat exchange equipment life loss detection device provided in an embodiment of the present application. The heat exchange equipment life loss detection device 50 comprises: an acquisition module 501 , a model building module 502 , a monitoring module 503 and a determination module 504 .

[0167] Among them, the acquisition module is used to define multiple test nodes in the heat exchange equipment to be tested, and obtain the geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters represent the morphological structure information of the test node, and the material characteristic parameters represent the property information of the constituent materials of the test node; the model construction module is used to construct a hybrid simulation model of the test node for any test node based on the conservation principle of the heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each test node; the monitoring module is used to monitor the life loss evaluation index of each test node in real time based on the hybrid simulation model of each test node and according to the current working condition index of each test node; the determination module is used to determine the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node.

[0168] Specifically, in one embodiment, the model building module is specifically used to:

[0169] Based on the conservation principle of heat exchange equipment, the mechanism model of each test node is constructed according to the geometric structure parameters and material characteristic parameters of each test node;

[0170] Input the measured value of the working condition index of the test node into the mechanism model to obtain the simulated value of the life loss index output by the mechanism model;

[0171] Constructing a mathematical model of the test node according to a deviation between a simulated value of the life loss index and an actual measured value of the life loss index of the test node;

[0172] The mechanism model and the mathematical model of the test node are coupled to obtain a hybrid simulation model of the test node.

[0173] Specifically, in one embodiment, the monitoring module is specifically used to:

[0174] For any test node, the current working condition index of the test node is input into the mechanism model to obtain the corresponding life loss index simulation value;

[0175] Input the current working condition index of the test node into the mathematical model to obtain the current simulation deviation of the mechanism model;

[0176] According to the life loss indicator simulation value and the current simulation deviation, the current monitoring result of the life loss evaluation indicator of the test node is determined.

[0177] Specifically, in one embodiment, the determination module is specifically used to:

[0178] Determine the life loss evaluation result of each test node according to the life loss evaluation index of each test node;

[0179] The life loss test results of the heat exchange equipment are determined based on the life loss evaluation results of each test node.

[0180] Specifically, in one embodiment, the determination module is specifically used to:

[0181] For any test node, the creep life loss and fatigue life loss of the test node are determined according to the life loss index, geometric structure parameters and material characteristic parameters of the test node;

[0182] The life loss evaluation result of the test node is determined according to the accumulated results of the creep life loss and the fatigue life loss of the test node.

[0183] Specifically, in one embodiment, the determination module is specifically used to:

[0184] Determine the current pipe wall creep stress of the test node according to the current steam pressure, pipe inner diameter and pipe wall thickness of the test node;

[0185] Determine the current creep rupture time of the test node according to the current temperature of the test node, the current pipe wall creep stress and the material characteristic parameters;

[0186] Determine the creep life loss of the test node according to the creep rupture time data of the test node during the entire operation cycle of the heat exchange device;

[0187] Among them, the life loss indicators include the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

[0188] Specifically, in one embodiment, the determination module is specifically used to:

[0189] Determine the current fatigue mechanical stress of the test node according to the current steam pressure, the inner diameter of the pipe and the wall thickness of the pipe at the test node;

[0190] Determine the thermal stress of the test node according to the linear expansion coefficient, elastic modulus, Poisson coefficient, inner and outer wall temperature difference and geometric structure parameters of the test node;

[0191] Determine the current fatigue composite stress of the test node according to the current fatigue mechanical stress and thermal stress;

[0192] According to the fatigue synthetic stress data of the test node in the entire operation cycle of the heat exchange equipment, determine the maximum full cycle and half cycle of the test node;

[0193] Determine the fatigue life loss of the test node according to the maximum full cycle number and the maximum half cycle number of the test node;

[0194] Among them, the life loss indicators include the current steam pressure and the temperature difference between the inner and outer walls, the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall, and the material property parameters include the linear expansion coefficient, elastic modulus and Poisson's coefficient.

[0195] Regarding the heat exchange equipment life loss detection device in this embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0196] The heat exchange equipment life loss detection device provided in the embodiment of the present application is used to execute the heat exchange equipment life loss detection method provided in the above embodiment. Its implementation method and principle are the same and will not be repeated here.

[0197] An embodiment of the present application provides an electronic device for executing the heat exchange equipment life loss detection method provided in the above embodiment.

[0198] like Figure 6 FIG. 6 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 60 includes: at least one processor 61 and a memory 62 .

[0199] The memory stores computer-executable instructions; at least one processor executes the computer-executable instructions stored in the memory, so that at least one processor executes the heat exchange equipment life loss detection method provided in the above embodiment.

[0200] An electronic device provided in an embodiment of the present application is used to execute the heat exchange equipment life loss detection method provided in the above embodiment. Its implementation method and principle are the same and will not be repeated here.

[0201] An embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, a method for detecting life loss of heat exchange equipment provided in any of the above embodiments is implemented.

[0202] The storage medium containing computer executable instructions in the embodiment of the present application can be used to store computer executable instructions of the heat exchange equipment life loss detection method provided in the aforementioned embodiment. Its implementation method and principle are the same and will not be repeated here.

[0203] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0205] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0206] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0207] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting the life loss of heat exchange equipment, characterized in that: include: Define multiple test nodes in the heat exchange device to be tested, and obtain geometric structure parameters and material characteristic parameters of each test node; wherein the geometric structure parameters represent the morphological structure information of the test node, and the material characteristic parameters represent the property information of the constituent materials of the test node; For any of the test nodes, based on the conservation principle of the heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each of the test nodes, a hybrid simulation model of the test node is constructed; Based on the hybrid simulation model of each of the test nodes, and according to the current working condition indicators of each of the test nodes, the life loss evaluation indicators of each of the test nodes are monitored in real time; Determining the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node; Wherein, determining the life loss evaluation result of each test node according to the life loss evaluation index of each test node includes: For any of the test nodes, determine the creep life loss and fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node; Determine a life loss evaluation result of the test node according to the cumulative result of the creep life loss and the fatigue life loss of the test node; Determining the creep life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node includes: Determine the current pipe wall creep stress of the test node according to the current steam pressure, pipe inner diameter and pipe wall thickness of the test node; Determine the current creep rupture time of the test node according to the current temperature of the test node, the current pipe wall creep stress and the material characteristic parameter; Determining the creep life loss of the test node according to the creep rupture time data of the test node during the entire operation cycle of the heat exchange device; The life loss index includes the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

2. The method according to claim 1, characterized in that: Based on the conservation principle of the heat exchange equipment, according to the geometric structure parameters and material characteristic parameters of each test node, a hybrid simulation model of the test node is constructed, including: Based on the conservation principle of the heat exchange equipment, and according to the geometric structure parameters and material characteristic parameters of each test node, a mechanism model of the test node is constructed; Inputting the measured value of the working condition index of the test node into the mechanism model to obtain the simulated value of the life loss index output by the mechanism model; Constructing a mathematical model of the test node according to a deviation between the simulated value of the life loss index and the actual measured value of the life loss index of the test node; The mechanism model and the mathematical model of the test node are coupled to obtain a hybrid simulation model of the test node.

3. The method according to claim 2, characterized in that The hybrid simulation model based on each of the test nodes monitors the life loss evaluation index of each of the test nodes in real time according to the current working condition index of each of the test nodes, including: For any of the test nodes, the current operating condition index of the test node is input into the mechanism model to obtain a corresponding life loss index simulation value; Inputting the current working condition index of the test node into the mathematical model to obtain the current simulation deviation of the mechanism model; According to the life loss indicator simulation value and the current simulation deviation, the current monitoring result of the life loss evaluation indicator of the test node is determined.

4. The method according to claim 1, characterized in that Determining the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node includes: Determining a life loss evaluation result of each of the test nodes according to the life loss evaluation index of each of the test nodes; The life loss detection result of the heat exchange equipment is determined according to the life loss evaluation result of each of the test nodes.

5. The method according to claim 1, characterized in that Determining the fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node includes: Determine the current fatigue mechanical stress of the test node according to the current steam pressure, the inner diameter of the pipe and the wall thickness of the pipe at the test node; Determine the thermal stress of the test node according to the linear expansion coefficient, elastic modulus, Poisson coefficient, inner and outer wall temperature difference and geometric structure parameters of the test node; Determining the current fatigue composite stress of the test node according to the current fatigue mechanical stress and thermal stress; Determine the maximum full-cycle and half-cycle cycle times of the test node according to the fatigue composite stress data of the test node during the entire operation cycle of the heat exchange device; Determine the fatigue life loss of the test node according to the maximum full cycle number and the maximum half cycle number of the test node; The life loss index includes the current steam pressure and the temperature difference between the inner and outer walls, the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall, and the material characteristic parameters include the linear expansion coefficient, elastic modulus and Poisson's coefficient.

6. A device for detecting the life loss of heat exchange equipment, characterized in that: include: An acquisition module, used to define a plurality of test nodes in the heat exchange device to be tested, and acquire geometric structure parameters and material characteristic parameters of each of the test nodes; wherein the geometric structure parameters represent the morphological structure information of the test node, and the material characteristic parameters represent the property information of the constituent materials of the test node; A model building module, for building a hybrid simulation model of any of the test nodes based on the conservation principle of the heat exchange equipment and according to the geometric structure parameters and material characteristic parameters of each of the test nodes; A monitoring module, for monitoring the life loss evaluation index of each test node in real time based on the hybrid simulation model of each test node and according to the current working condition index of each test node; A determination module, used to determine the life loss detection result of the heat exchange equipment according to the life loss evaluation index of each test node; Wherein, the determination module is specifically used for: For any of the test nodes, determine the creep life loss and fatigue life loss of the test node according to the life loss index, geometric structure parameters and material characteristic parameters of the test node; Determine a life loss evaluation result of the test node according to the cumulative result of the creep life loss and the fatigue life loss of the test node; The determining module is specifically used for: Determine the current pipe wall creep stress of the test node according to the current steam pressure, pipe inner diameter and pipe wall thickness of the test node; Determine the current creep rupture time of the test node according to the current temperature of the test node, the current pipe wall creep stress and the material characteristic parameter; Determining the creep life loss of the test node according to the creep rupture time data of the test node during the entire operation cycle of the heat exchange device; The life loss index includes the current steam pressure and the current temperature, and the geometric structure parameters include the inner diameter of the tube and the thickness of the tube wall.

7. An electronic device, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the processor executes the computer-executable instructions, the method according to any one of claims 1 to 5 is implemented.

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