Test device and method for influence of actual working condition of power station boiler on mechanical properties of material

Abstract

The application provides a test device and method for the influence of actual working conditions of a power station boiler on material mechanical properties, which is suitable for the mechanical property test of all metal components of the power station boiler and is also suitable for other high-temperature and high-pressure components of the power station; the method has high practicability because it collects actual operation parameters and has high conformity with actual working conditions; the test device is improved by adding a computer control system on the basis of an original creep machine, and the improvement can be completed through device modification and cost saving; the test method can roughly determine the influence of current generator set deep peak shaving on equipment; the designed chuck can hang multiple samples through a test machine, the temperature of the samples is the same, the tension can be controlled individually or simultaneously, the test error caused by the difference factors of the test machine is reduced, and the accuracy and comparability of the obtained test results are greatly improved.

Description

Technical Field

[0001] This invention relates to a test apparatus and method for the influence of actual operating conditions of power plant boilers on the mechanical properties of materials. Background Technology

[0002] The main body of a power plant boiler is composed of various metallic materials, especially the high-temperature and high-pressure components. The low-temperature section of a subcritical boiler primarily uses low-alloy steels, such as manganese steel, low-carbon steel, 15CrMo, and 12Cr1MoV, while the high-temperature section uses high-alloy steels, such as 91 and TP347. With the widespread use of large-capacity, high-parameter ultracritical units in China, high-grade metallic materials such as TP347HFG, Super304, and HR3C are also widely applied.

[0003] To reduce coal consumption in power plant boilers, the most direct and effective method is to use high-parameter units, which necessitates the use of high-temperature resistant metal materials. Ensuring the long-term safe and stable operation of these metal materials is a crucial issue, and the mechanical properties of the materials are directly influencing factors, with temperature and pressure being the two most important parameters.

[0004] Conventional research on the mechanical properties of materials mainly relies on mechanical property testing machines and creep machines to test the room temperature, high temperature, and long-term mechanical properties of metallic materials. However, during the operation of power plant boilers, the two important parameters that metallic materials are subjected to are not constant but fluctuate. In particular, with the influence of peak shaving and deep peak shaving of the unit, the temperature and pressure of the unit change even more significantly. Therefore, the values ​​obtained by conventional mechanical property tests will deviate significantly from the actual values.

[0005] Therefore, it is necessary to invent a test device and method for the influence of actual operating conditions of power plant boilers on the mechanical properties of materials, so as to test the mechanical property data of power plant boiler materials when operating with varying parameters, and to guide the selection and replacement of power plant boiler materials. Summary of the Invention

[0006] The technical problem this patent aims to solve is to provide a testing device and method for assessing the impact of actual operating conditions of power plant boilers on the mechanical properties of materials. This method is based on a creep testing machine. For a selected test component, actual operating condition parameters (primarily temperature and pressure) are collected. This data is used as experimental parameters. A computer precisely controls the temperature and tensile force of the creep testing machine to conduct variable-parameter creep performance tests. By conducting tests over multiple time periods, the test results are compared with conventional creep test parameters to obtain the yield strength ratio and tensile strength ratio. A comparison curve is established to evaluate the degree of influence of variable-parameter operation on the component, guiding the use and replacement of materials.

[0007] To solve the above-mentioned technical problems, the present invention provides a test device for the influence of actual operating conditions of power plant boilers on the mechanical properties of materials, including a testing machine. The testing machine includes a female clamp and multiple female clamps. The female clamps can be controlled individually. The computer control adopts multi-channel technology, and each channel can control one female clamp individually. Each test device can hang multiple samples for testing, reducing the influence of differences between different testing machines on the results.

[0008] It also includes a testing system, which has the functions of reading MIS temperature and pressure parameters, comparing pressure parameters with design pressure to calculate test tensile force, variable parameter temperature control, and variable parameter tensile force control.

[0009] The testing method for the impact of actual operating conditions of power plant boilers on the mechanical properties of materials includes the following steps:

[0010] S1. As needed, select specific units, such as those that participate in peak shaving for a long time, have large fluctuations in operating load, have many non-stop situations, and whose causes are not easy to find, and select specific components, such as components that are prone to leakage, severely aged components, and components that are damaged by blowing, for testing.

[0011] S2. Select the test samples and spare parts to be used in the operation, and process the test samples according to the standard requirements; according to the actual operation conditions and the length of the test;

[0012] S3. The test temperature for spare parts is the design temperature, and the test tensile force a is the endurance strength of the material at the design temperature.

[0013] S4. Test parameters for running the sample: The temperature parameters in the MIS system are directly read by the computer, and the test temperature is controlled by the temperature sensor;

[0014] S5. Test parameters can be retrieved according to the test time points, or individual time periods can be selected for cyclical adjustment;

[0015] S6. After the test, a high-temperature tensile test was performed on the specimens. The temperature was selected as the design temperature to obtain the yield strength and tensile strength of each specimen.

[0016] S7. Compare the results of the test samples at each time point with the results of the spare parts test samples, calculate the yield strength ratio and tensile strength ratio, and establish a comparison curve.

[0017] S8. The yield strength ratio and tensile strength ratio are used as factors affecting the mechanical properties of metallic materials under varying working conditions.

[0018] S9. Select experimental data that are of reference value, discard data with large dispersion, and take the arithmetic mean of the remaining data at the same time point.

[0019] Preferably, in step S1, a representative operating segment of the MIS system is selected, and temperature and pressure parameters are retrieved and downloaded.

[0020] Preferably, in step S2, 5 samples are processed at each time point; the time points are selected as 720h and 2160h, which correspond to 1 month and 3 months, respectively.

[0021] Preferably, in step S4, the pressure parameter is compared with the design pressure to obtain the comparison coefficient μ, and the test tensile force a1 is: a1=μa.

[0022] Compared with related technologies, the experimental apparatus and method for measuring the influence of actual operating conditions of power plant boilers on the mechanical properties of materials provided by this invention have the following beneficial effects:

[0023] This invention provides a testing apparatus and method for assessing the impact of actual operating conditions of power plant boilers on the mechanical properties of materials. This method is applicable to the mechanical property testing of all metal components in power plant boilers, and also to other components in power plants subjected to high temperatures and pressures. The method collects actual operating parameters, which are highly consistent with actual operating conditions, making it highly practical. The testing apparatus is based on the original creep tester with the addition of a computer control system, which can be completed through device modification, saving costs. This testing method can roughly determine the impact of current generator unit deep peak shaving on the equipment. The designed clamp allows multiple samples to be hung on a single testing machine, ensuring that these samples are subjected to the same temperature. The tensile force can be controlled individually or simultaneously, reducing testing errors caused by differences in the testing machine and greatly improving the accuracy and comparability of the obtained test results. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of a preferred embodiment of the experimental apparatus and method for investigating the influence of actual operating conditions of a power plant boiler on the mechanical properties of materials provided by the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please refer to the following: Figure 1 ,in, Figure 1 This is a schematic flowchart of a preferred embodiment of the experimental apparatus and method for investigating the influence of actual operating conditions of a power plant boiler on the mechanical properties of materials provided by the present invention.

[0027] Example 1

[0028] A testing apparatus for investigating the impact of actual operating conditions of power plant boilers on the mechanical properties of materials includes a testing machine. This machine comprises a main clamp and multiple sub-clamps, each of which can be individually controlled. The computer control employs multi-channel technology, with each channel capable of controlling one sub-clamp independently. Each testing apparatus can hold multiple samples for testing, reducing the influence of differences between different testing machines on the results.

[0029] It also includes a testing system that can read MIS temperature and pressure parameters, calculate the test tensile force by comparing the pressure parameters with the design pressure, and control the temperature and tensile force with variable parameters. This method does not require any additional hardware costs; only a small control software needs to be designed.

[0030] A method for testing the impact of actual operating conditions of power plant boilers on the mechanical properties of materials includes the following steps:

[0031] 1. As needed, select specific units, such as those that participate in peak shaving for a long time, have large fluctuations in operating load, have many non-stop situations, and whose causes are not easy to find. Select specific components, such as components that are prone to leakage, severely aged components, and components that are damaged by blow-through, for testing. Select representative operating periods in the MIS system and retrieve and download temperature and pressure parameters.

[0032] 2. Select the test samples and spare parts to be used in the operation, and process the test samples according to the standard requirements; based on the actual operation, process 5 test samples at each time point according to the test duration; the time points are selected as 720h and 2160h, corresponding to 1 month and 3 months respectively;

[0033] 3. The test temperature for spare parts is the design temperature, and the test tensile force 'a' is the endurance strength of the material at the design temperature;

[0034] 4. Test parameters for the test specimen: The temperature parameters in the MIS system are directly read by the computer, and the test temperature is controlled by a temperature sensor; the pressure parameters are compared with the design pressure to obtain the comparison coefficient μ, and the test tensile force a1 is:

[0035] a1=μa

[0036] 5. Test parameters can be retrieved according to the test time points, or individual time periods can be selected for cyclical adjustment;

[0037] 6. After the test, a high-temperature tensile test was performed on the specimens at the design temperature to obtain the yield strength and tensile strength of each specimen.

[0038] 7. Compare the results of the test samples at each time point with the results of the spare parts test samples, calculate the yield strength ratio and tensile strength ratio, and establish a comparison curve;

[0039] 8. The yield strength ratio and tensile strength ratio are used as factors influencing the mechanical properties of metallic materials under varying operating conditions;

[0040] 9. Select experimental data that are of reference value, discard data with large dispersion, and take the arithmetic mean of the remaining data at the same time point.

[0041] Example 2

[0042] A testing apparatus for investigating the impact of actual operating conditions of power plant boilers on the mechanical properties of materials includes a testing machine. This machine comprises a main clamp and multiple sub-clamps, each of which can be individually controlled. The computer control employs multi-channel technology, with each channel capable of controlling one sub-clamp independently. Each testing apparatus can hold multiple samples for testing, reducing the influence of differences between different testing machines on the results.

[0043] It also includes a testing system that can read MIS temperature and pressure parameters, calculate the test tensile force by comparing the pressure parameters with the design pressure, and control the temperature and tensile force with variable parameters. This method does not require any additional hardware costs; only a small control software needs to be designed.

[0044] A method for testing the impact of actual operating conditions of power plant boilers on the mechanical properties of materials includes the following steps:

[0045] 1. As needed, select specific units, such as those that participate in peak shaving for a long time, have large fluctuations in operating load, have many non-stop situations, and whose causes are not easy to find. Select specific components, such as components that are prone to leakage, severely aged components, and components that are damaged by blow-through, for testing. Select representative operating periods in the MIS system and retrieve and download temperature and pressure parameters.

[0046] 2. Select the test samples and spare parts to be used in the operation, and process the test samples according to the standard requirements; based on the actual operation, process 5 test samples at each time point according to the test duration; the time points are selected as 4320h and 8640h, corresponding to half a year and one year respectively;

[0047] 3. The test temperature for spare parts is the design temperature, and the test tensile force 'a' is the endurance strength of the material at the design temperature;

[0048] 4. Test parameters for the test specimen: The temperature parameters in the MIS system are directly read by the computer, and the test temperature is controlled by a temperature sensor; the pressure parameters are compared with the design pressure to obtain the comparison coefficient μ, and the test tensile force a1 is:

[0049] a1=μa

[0050] 5. Test parameters can be retrieved according to the test time points, or individual time periods can be selected for cyclical adjustment;

[0051] 6. After the test, a high-temperature tensile test was performed on the specimens at the design temperature to obtain the yield strength and tensile strength of each specimen.

[0052] 7. Compare the results of the test samples at each time point with the results of the spare parts test samples, calculate the yield strength ratio and tensile strength ratio, and establish a comparison curve;

[0053] 8. The yield strength ratio and tensile strength ratio are used as factors influencing the mechanical properties of metallic materials under varying operating conditions;

[0054] 9. Select experimental data that are of reference value, discard data with large dispersion, and take the arithmetic mean of the remaining data at the same time point.

[0055] The working principle of the experimental apparatus and method for the influence of actual operating conditions of power plant boilers on the mechanical properties of materials provided by this invention is as follows:

[0056] This method is applicable to the mechanical performance testing of all metal components in power plant boilers, and is also applicable to other components in power plants that are subjected to high temperature and high pressure.

[0057] This method collects actual operating parameters, which are highly consistent with actual working conditions, and has high practicality.

[0058] The experimental setup is based on the original creep machine with the addition of a computer control system, which can be completed through device modification, saving costs;

[0059] This test method can be used to roughly determine the impact of the current deep peak shaving of generator sets on the equipment;

[0060] The designed clamp allows multiple specimens to be hung on a single testing machine, ensuring that these specimens are subjected to the same temperature. The tensile force can be controlled individually or simultaneously, reducing testing errors caused by differences in the testing machine and greatly improving the accuracy and comparability of the test results.

[0061] 1. Select the unit, select the specific component, and choose the test time.

[0062] 2. Process the test specimens according to the test standards.

[0063] 3. Collect the operating conditions of the unit, import the temperature parameters into the computer of the testing device, compare the pressure parameters with the conventional test parameters, convert them into tensile parameters, and import them into the computer of the testing device.

[0064] 4. Load the prepared sample into the testing device.

[0065] 5. Begin the experiment.

[0066] 6. After the creep test, all specimens were subjected to a high-temperature tensile test to obtain the yield strength and tensile strength of each specimen.

[0067] 7. Compare the results of the test samples at each time point with the results of the spare parts test samples, calculate the yield strength ratio and tensile strength ratio, and establish a comparison curve.

[0068] 8. The yield strength ratio and tensile strength ratio are used as factors affecting the mechanical properties of metallic materials under varying operating conditions.

[0069] 9. The experiment is over.

[0070] Compared with related technologies, the experimental apparatus and method for measuring the influence of actual operating conditions of power plant boilers on the mechanical properties of materials provided by this invention have the following beneficial effects:

[0071] This method is applicable to the mechanical performance testing of all metal components in power plant boilers, and is also applicable to other components in power plants that are subjected to high temperature and high pressure.

[0072] This method collects actual operating parameters, which are highly consistent with actual working conditions, and has high practicality.

[0073] The experimental setup is based on the original creep machine with the addition of a computer control system, which can be completed through device modification, saving costs;

[0074] This test method can be used to roughly determine the impact of the current deep peak shaving of generator sets on the equipment;

[0075] The designed clamp allows multiple specimens to be hung on a single testing machine, ensuring that these specimens are subjected to the same temperature. The tensile force can be controlled individually or simultaneously, reducing testing errors caused by differences in the testing machine and greatly improving the accuracy and comparability of the test results.

[0076] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A test method for the influence of actual operating conditions of power plant boilers on the mechanical properties of materials, characterized in that: The test device includes an experimental apparatus for measuring the impact of actual operating conditions of power plant boilers on the mechanical properties of materials. The experimental apparatus includes a testing machine, which includes a female clamp and multiple female clamps. The female clamps can be controlled individually. The computer control adopts multi-channel technology, and each channel can control one female clamp individually. Each test device can hang multiple samples for testing, thereby reducing the impact of differences between different test machines on the results. It also includes a testing system, which has the functions of reading MIS temperature and pressure parameters, comparing pressure parameters with design pressure to calculate test tensile force, variable parameter temperature control, and variable parameter tensile force control. It also includes the following steps: S1. As needed, select specific generating units that participate in peak shaving for a long time, have large fluctuations in operating load, have many non-stop situations, and whose causes are difficult to find; select specific components, such as components prone to leakage, severely aged components, and components subject to blow damage, for testing; select representative operating periods in the MIS system and retrieve and download temperature and pressure parameters. S2. Select the test samples and spare parts to participate in the operation, and process the test samples according to the standard requirements; S3. The test temperature for spare parts is the design temperature, and the test tensile force a is the endurance strength of the material at the design temperature. S4. Test parameters for the test specimen: The temperature parameters in the MIS system are directly read by the computer, the test temperature is controlled by the temperature sensor, the pressure parameters are compared with the design pressure to obtain the comparison coefficient μ, and the test tensile force is μa; S5. The test parameters are retrieved according to the test time nodes, or individual time periods are selected for cyclical adjustment. The prepared sample is loaded into the test device and the test is started. S6. After the creep test, a high-temperature tensile test is performed on the specimens. The temperature is selected as the design temperature to obtain the yield strength and tensile strength of each specimen. S7. Compare the results of the test samples at each time point with the results of the spare parts test samples, calculate the yield strength ratio and tensile strength ratio, and establish a comparison curve. S8. The yield strength ratio and tensile strength ratio are used as factors affecting the mechanical properties of metallic materials under varying working conditions. S9. Select experimental data that are of reference value and discard data with large dispersion.

2. The test method for the influence of actual operating conditions of a power plant boiler on the mechanical properties of materials according to claim 1, characterized in that, In step S2, based on the actual operating conditions and the length of the test, 5 samples are processed at each time point; the time points are selected as 720h and 2160h, corresponding to 1 month and 3 months, respectively.

3. The test method for the influence of actual operating conditions of a power plant boiler on the mechanical properties of materials according to claim 1, characterized in that, In step S9, the remaining data at the same time point are taken as the arithmetic average.

Images