Boiler operation damage analysis method and system based on blackbody cavity radiation temperature measurement

Abstract

The invention discloses a boiler operation damage analysis method and system based on blackbody cavity radiation temperature measurement, and the method comprises the steps: receiving the heat radiation of a measured object in a boiler through a blackbody cavity of a blackbody cavity sensor to generate blackbody radiation, and obtaining the blackbody temperature through the blackbody radiation; calculating the reference response quantity of the blackbody cavity sensor; acquiring the actual response quantity of the blackbody cavity sensor; obtaining a relation coefficient between the emissivity and the wavelength of the measured object according to the actual response quantity and the reference response quantity, and calculating the actual temperature of the measured object according to the relation coefficient and the blackbody temperature; and based on the thermal elastic-plastic creep analysis mathematical model and the actual temperature of the measured object, analyzing and acquiring the damage condition of the measured object, and outputting the damage condition. According to the boiler operation damage analysis method provided by the invention, the accuracy of the obtained temperature of the measured object can be improved, so that the accuracy of the boiler internal damage condition output by the boiler operation damage analysis method can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of power station boiler temperature detection technology, and in particular to a boiler operation damage analysis method and system based on blackbody cavity radiation temperature measurement. Background Art

[0002] At present, my country's electricity supply is still dominated by coal-fired power generation. In order to reduce emission pollution, high efficiency and cleanliness are the inevitable development goals of coal-fired power generation technology. Therefore, improving operating parameters has become an inevitable trend for coal-fired power generation units, but complex operating conditions can easily cause unstable combustion in the furnace, resulting in metal damage problems such as over-temperature operation of the heating surface tubes, low-cycle fatigue damage, and accelerated generation and shedding of oxide scale, which poses a major safety hazard. In addition, due to the high temperature in the furnace, it is difficult to measure the temperature of the heating surface tubes directly in the furnace, and the accuracy of temperature measurement outside the furnace is not high, resulting in the inability to accurately obtain the actual temperature of the heating surface tubes, affecting the accuracy of the judgment of the damage status of the heating surface tubes. Summary of the invention

[0003] A first aspect of the present invention proposes a boiler operation damage analysis method based on blackbody cavity radiation temperature measurement. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement has the advantage of improving the accuracy of judging the internal damage of the boiler.

[0004] According to the first aspect of the present invention, the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement includes: receiving the thermal radiation of the object to be measured in the boiler through the blackbody cavity of the blackbody cavity sensor to generate blackbody radiation, and obtaining the blackbody temperature through the blackbody radiation; calculating the reference response of the blackbody cavity sensor, the reference response is the intensity of the electrical signal or light signal output by the blackbody cavity sensor after receiving the radiation energy of the object to be measured when the blackbody cavity is set to be an absolute blackbody; obtaining the actual response of the blackbody cavity sensor, the actual response is the intensity of the electrical signal or light signal output by the blackbody cavity sensor after receiving the radiation energy of the object to be measured; obtaining the relationship coefficient a between the emissivity and the wavelength of the object to be measured according to the actual response of the blackbody cavity sensor and the reference response, and calculating the actual temperature of the object to be measured according to the relationship coefficient a between the emissivity and the wavelength and the measured blackbody temperature; analyzing and obtaining the damage of the object to be measured based on the thermal elastic-plastic creep analysis mathematical model and the actual temperature of the object to be measured, and outputting the damage.

[0005] According to the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement in the first aspect of the embodiment of the present invention, the relationship coefficient between the emissivity and wavelength of the object to be measured is obtained by comparing the actual response of the blackbody cavity sensor with the reference response, and the actual temperature of the object to be measured is obtained by correcting the blackbody temperature through the above relationship coefficient. The accuracy of the obtained temperature of the object to be measured can be improved, thereby improving the accuracy of the internal damage of the boiler output by the boiler operation damage analysis method, so that the operating personnel can discover the damage problem in time, and provide a reliable basis for the operating personnel to accurately understand the usage of the boiler.

[0006] According to some embodiments of the present invention, the step of obtaining the relationship coefficient a between the emissivity and the wavelength of the object under test based on the actual response amount and the reference response amount of the blackbody cavity sensor includes: when the object under test is an absolute blackbody, based on formula 1 and formula 2, establishing the equation of each temperature measurement channel and solving them simultaneously to obtain the reference response amount, thereby obtaining formula 3; Formula 1: ; Formula 2: ; Formula 3: ; Wherein, V is the actual response of the blackbody cavity sensor, V' is the reference response of the blackbody cavity sensor, A is the temperature measurement coefficient of the blackbody cavity radiation optical fiber temperature measurement subsystem, λ is the wavelength of the object being measured, e is the natural logarithm, C2 is the relationship coefficient between the blackbody temperature and the brightness temperature, i is the index of the temperature measurement data sample of the object being measured, indicating the number of multiple data samples collected during the temperature measurement process, T is the blackbody temperature, is the emissivity of the object being measured, n is the total number of temperature measurement data samples of the object being measured, and a is the relationship coefficient between emissivity and wavelength.

[0007] According to some embodiments of the present invention, the actual temperature of the measured object is calculated based on the relationship coefficient a between the emissivity and the wavelength and the measured black body temperature, including: substituting the relationship coefficient a into the calculation formula: ; Get the actual temperature of the object under test, where Y is the actual temperature of the object under test, T is the blackbody temperature of each temperature measurement channel, i is the index of the temperature measurement data sample of the object under test, indicating the number of multiple data samples collected during the temperature measurement process, and n is the total number of temperature measurement data samples of the object under test.

[0008] According to some embodiments of the present invention, obtaining the blackbody temperature through blackbody radiation includes: collecting blackbody radiation and forming an optical signal, transmitting the optical signal to two narrowband source light sheets of different wavelengths through a transmission optical fiber, and converting it into a voltage signal through a photodetector; after amplifying the voltage signal through an amplification circuit, collecting it through a single-chip microcomputer to a terminal processor for data colorimetric processing to obtain the blackbody temperature.

[0009] According to some embodiments of the present invention, the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement also includes: setting a plurality of objects to be measured in the boiler, and obtaining the actual temperatures of the plurality of objects to be measured; and obtaining the distribution of damage states at different positions inside the furnace of the boiler based on the actual temperatures of the plurality of objects to be measured.

[0010] According to some embodiments of the present invention, after calculating the actual temperature of the measured object, the method further includes: displaying and recording the acquired actual temperature, and issuing a high temperature warning after the actual temperature exceeds a set threshold.

[0011] A second aspect of the present invention provides a boiler operation damage analysis system.

[0012] According to the boiler operation damage analysis system of the second aspect of the present invention, which is used to execute the above-mentioned boiler operation damage analysis method based on blackbody cavity radiation temperature measurement, it includes: a blackbody cavity radiation optical fiber temperature measurement subsystem, including a temperature acquisition module and a signal processing module, the temperature acquisition module includes a blackbody cavity sensor, a receiving unit and a transmission optical fiber, the blackbody cavity sensor is used to receive the thermal radiation of the object to be measured in the boiler to generate blackbody radiation and generate an optical signal, the receiving unit is used to receive the optical signal of the blackbody cavity sensor and transmit it to the transmission optical fiber, the transmission optical fiber is used to transmit the optical signal to the signal processing module, and the signal processing module is used to convert the optical signal into a blackbody temperature; the boiler operation damage analysis subsystem includes a temperature conversion module and an analysis output module, which are used to convert the blackbody temperature into the actual temperature of the object to be measured, and the analysis output module is used to analyze the damage condition of the object to be measured according to the actual temperature of the object to be measured and output the damage condition.

[0013] According to the boiler operation damage analysis system of the second aspect of the present invention, the relationship coefficient between the emissivity and wavelength of the object to be measured is obtained by comparing the actual response of the blackbody cavity sensor with the reference response, and the actual temperature of the object to be measured is obtained by correcting the blackbody temperature through the above relationship coefficient. The accuracy of the obtained temperature of the object to be measured can be improved, thereby improving the accuracy of the internal damage of the boiler output by the boiler operation damage analysis method, so that the operating personnel can discover the damage problem in time, and provide a reliable basis for the operating personnel to accurately understand the usage of the boiler.

[0014] According to some embodiments of the present invention, the boiler operation damage analysis subsystem further includes a wireless communication module, and the temperature conversion module is communicatively connected to the analysis output module via the wireless communication module to transmit the actual temperature of the measured object to the analysis output module.

[0015] According to some embodiments of the present invention, the analysis output module includes an analysis unit and an output unit, the analysis unit is used to analyze the damage condition of the object under test according to the actual temperature of the object under test, and the output unit includes a display component, and the display component is used to display the damage condition of the object under test.

[0016] According to some embodiments of the present invention, the boiler operation damage analysis subsystem further includes: a compressed air cooling module, wherein the compressed air cooling module is used to deliver compressed air toward the blackbody cavity sensor to cool the blackbody cavity sensor.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flowchart of a method for analyzing boiler operation damage based on blackbody cavity radiation temperature measurement according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0021] The following describes a boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to an embodiment of the first aspect of the present invention with reference to the accompanying drawings.

[0022] like Figure 1As shown, according to the first aspect of the present invention, the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement comprises: receiving the thermal radiation of the object to be measured in the boiler through the blackbody cavity of the blackbody cavity sensor to generate blackbody radiation, and obtaining the blackbody temperature through the blackbody radiation. It should be noted that the essence of the blackbody temperature is the equivalent temperature inverted by the blackbody cavity sensor through the radiation energy, rather than the actual temperature of the object to be measured. The blackbody temperature refers to the equivalent blackbody temperature calculated based on the blackbody radiation law after the thermal radiation of the object to be measured is received by the blackbody cavity sensor.

[0023] It is understandable that the combustion flame and high-temperature flue gas in the furnace of the boiler heat the flowing water vapor mixture in the heating surface tube by radiation, convection, etc. In general, the temperature of the high-temperature flue gas is about 1200 degrees, and the temperature in the heating surface tube is between 450 and 650 degrees, resulting in a high temperature at the location where the heating surface tube is arranged. Among them, the blackbody cavity sensor can be arranged in the furnace, such as fixed on the surface of the object to be measured and in direct contact with the object to be measured, so that the thermal radiation emitted by the object to be measured, such as the heating surface tube, can be received by the blackbody cavity of the blackbody cavity sensor, and the blackbody temperature of the blackbody cavity is obtained after conversion and calculation so as to obtain the temperature of the object to be measured according to the blackbody temperature.

[0024] Among them, the blackbody cavity radiation temperature measurement method is convenient for real-time and continuous monitoring of the blackbody temperature of the object being measured with high accuracy. At the same time, the blackbody cavity radiation fiber optic temperature measurement subsystem has strong adaptability to the use environment and can be used under special working conditions such as strong electromagnetic field interference, strong background light, strong chemical corrosion and severe dust pollution.

[0025] The reference response of the blackbody cavity sensor is calculated. The reference response is the intensity of the electrical signal or optical signal output by the blackbody cavity sensor after receiving the radiation energy of the object under test when the object under test is set to be an absolute blackbody. When the blackbody cavity is an absolute blackbody, it can completely absorb the thermal radiation emitted by the object under test, that is, the radiation energy of the object under test received by the blackbody cavity sensor containing the absolute blackbody is the same as the radiation energy emitted by the object under test. Based on the intensity of the electrical signal or optical signal output by the blackbody cavity sensor after receiving the radiation energy of the object under test, the temperature of the object under test can be obtained more accurately.

[0026] However, it is understandable that the black body cavity is not an absolute black body, therefore, further, the actual response of the black body cavity sensor is obtained, and the actual response is the intensity of the electrical signal or optical signal output by the black body cavity sensor after receiving the radiation energy of the measured object. That is, the intensity of the electrical signal or optical signal actually output by the black body cavity sensor after absorbing the thermal radiation of the measured object is obtained.

[0027] The relationship coefficient a between the emissivity and wavelength of the object under test is obtained according to the actual response amount and the reference response amount of the blackbody cavity sensor, and the actual temperature of the object under test is calculated according to the relationship coefficient a between the emissivity and wavelength and the measured blackbody temperature. Among them, since the actual response amount is measured when the blackbody cavity is not an absolute blackbody, there is a deviation between the temperature of the object under test obtained according to the actual response amount, that is, the blackbody temperature, and the actual temperature of the object under test. It is necessary to correct the blackbody temperature by the emissivity of the object under test to obtain a more accurate actual temperature of the object under test. By comparing the actual response amount and the reference response amount, the relationship coefficient a between the emissivity and wavelength of the object under test can be accurately obtained, so that the change law of the emissivity of the object under test relative to the wavelength can be obtained, that is, the emissivity of the object under test can be obtained more accurately, so that on the basis of the relationship coefficient a between the emissivity and wavelength of the object under test, combined with the obtained blackbody temperature, a more accurate actual temperature of the object under test can be obtained, so as to improve the accuracy of the temperature measurement data of the object under test.

[0028] Based on the thermoelastic-plastic creep analysis mathematical model and the actual temperature of the object under test, the damage condition of the object under test is analyzed and obtained, and the damage condition is output. Among them, the creep condition of the object under test under temperature can be analyzed by the thermoelastic-plastic creep analysis mathematical model. Since the actual temperature of the object under test can be obtained through the above steps, the analysis accuracy of the thermoelastic-plastic creep analysis mathematical model can be improved. Therefore, the accuracy of the internal damage condition of the boiler output by the boiler operation damage analysis method can be improved, so that the operating personnel can find the damage problem in time, and provide a reliable basis for the operating personnel to accurately understand the use of the boiler.

[0029] According to the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement in the first aspect of the embodiment of the present invention, the relationship coefficient between the emissivity and wavelength of the object to be measured is obtained by comparing the actual response of the blackbody cavity sensor with the reference response, and the actual temperature of the object to be measured is obtained by correcting the blackbody temperature through the above relationship coefficient. The accuracy of the obtained temperature of the object to be measured can be improved, thereby improving the accuracy of the internal damage of the boiler output by the boiler operation damage analysis method, so that the operating personnel can discover the damage problem in time, and provide a reliable basis for the operating personnel to accurately understand the usage of the boiler.

[0030] In a specific example, the object to be measured is the high-temperature heating surface tube in the furnace of a boiler. Through the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement, real-time monitoring and analysis of the temperature of the high-temperature heating surface tube on the flue gas side of the furnace can be achieved, thereby measuring the distribution of damage status of various parts inside the furnace, and providing the change trend of the equipment throughout its life cycle, which is beneficial to the safe monitoring of power plant boilers. Through real-time data analysis and prediction of the heating surface tubes inside the furnace, it helps power plants to achieve more reliable and efficient operation management, and contribute to the sustainable development of the entire energy industry.

[0031] According to some embodiments of the present invention, the relationship coefficient between the emissivity and the wavelength of the object under test is obtained according to the actual response amount and the reference response amount of the black body cavity sensor, including: when the object under test is an absolute black body, based on formula 1 and formula 2, the equation of each temperature measurement channel is established and solved simultaneously to obtain the reference response amount, thereby obtaining formula 3; Formula 1: ; Formula 2: ; Formula 3: ; Among them, V is the actual response of the blackbody cavity sensor, V' is the reference response of the blackbody cavity sensor, A is the temperature measurement coefficient of the blackbody cavity radiation fiber temperature measurement subsystem, λ is the wavelength of the object being measured, e is the natural logarithm, C2 is the relationship coefficient between the blackbody temperature and the brightness temperature of the object being measured, which can be obtained through multiple measurements and comparisons, i is the index of the temperature measurement data sample of the object being measured, which represents the number of multiple data samples collected during the temperature measurement process, which can be simply understood as the number of temperature measurements, T is the blackbody temperature, is the emissivity of the object being measured, n is the total number of temperature measurement data samples of the object being measured, and a is the relationship coefficient between emissivity and wavelength. is the actual response during the i-th temperature measurement, is the reference response of the i-th temperature measurement, is the wavelength of thermal radiation emitted by the object being measured during the i-th temperature measurement, is the relationship coefficient between emissivity and wavelength during the i-th temperature measurement.

[0032] Thus, the relationship coefficient between the emissivity and wavelength of the measured object can be accurately obtained, so that the black body temperature can be corrected according to the relationship coefficient between the emissivity and wavelength of the measured object to obtain the actual temperature of the measured object.

[0033] Specifically, at a certain wavelength, if the actual radiance of the object being measured is equal to the radiance of a black body at a certain temperature, the black body temperature under this condition is called the brightness temperature of the object.

[0034] However, for actual objects, due to their emissivity characteristics and high temperature background, radiation will be reflected on the surface of the object, that is, the black body cavity is not an absolute black body, and the emissivity is less than 1, resulting in the black body cavity not being able to completely absorb the thermal radiation of the object being measured, resulting in a certain deviation between the brightness temperature of the object being measured and the black body temperature.

[0035] Combined with Wien's formula, the relationship between blackbody temperature and brightness temperature is as follows: ; Where, T is the black body temperature, λ is the wavelength of the object being measured, e is the natural logarithm, C2 is the relationship coefficient between the black body temperature and the brightness temperature, is the emissivity of the object under test at wavelength λ, f is the frequency, is the brightness temperature obtained through the temperature measurement channel m, is the brightness temperature obtained through the temperature measurement channel r.

[0036] In colorimetric temperature measurement, there are two channels r and m, corresponding to different wavelengths and emissivities respectively. Combining the Wien approximation formula, the relationship between the blackbody temperature and the brightness temperature of the two channels is obtained: m channel: ; r channel: ; in, is the wavelength of the r channel, is the firing rate of channel r, is the wavelength of the m channel, is the emission rate of channel m, is the brightness temperature obtained through the temperature measurement channel m, is the brightness temperature obtained through the temperature measurement channel m, is the blackbody temperature obtained through the temperature measurement channel m, is the blackbody temperature obtained through the temperature measurement channel r, and C2 is the relationship coefficient between the blackbody temperature and the brightness temperature, which can be calculated through a large amount of temperature measurement data.

[0037] From the above relationship between the m channel and the n channel, it can be concluded that only after the brightness temperature of the object is measured by the single-wavelength radiation measurement method and the corresponding accurate emissivity value is added, can the actual temperature of the object be accurately obtained. However, there is no complete full-wavelength emissivity database for query to obtain the emissivity value of the object.

[0038] Therefore, the conversion of the bright body temperature of the object to the actual temperature and the incidence rate is calculated by deriving the above formulas 1 to 3. Specifically, the above formulas 1 and 2 are mathematical models based on the reference temperature when the blackbody cavity is an absolute blackbody, wherein formula 1 constructs the corresponding relationship between the blackbody cavity sensor and the wavelength and the blackbody temperature, and formula 2 constructs the relationship between the emissivity and the wavelength. Equations can be established for each temperature measurement channel such as the m channel and the r channel, respectively, and the reference response quantity V' of the blackbody cavity sensor can be obtained by combining formulas 1 and 2 to solve them, and formula 3 can be obtained by sorting them out. Formula 3 can obtain the relationship coefficient a by comparing the reference response quantity with the actual response quantity, so as to facilitate the subsequent calculation of the actual temperature based on the relationship coefficient a.

[0039] According to some embodiments of the present invention, the actual temperature of the measured object is calculated based on the relationship coefficient a between the emissivity and the wavelength and the measured black body temperature, including: substituting the relationship coefficient a into the calculation formula: ; Get the actual temperature of the object being measured, where Y is the actual temperature of the object being measured, T is the blackbody temperature of each temperature measurement channel, i is the index of the temperature measurement data sample of the object being measured, which indicates the number of multiple data samples collected during the temperature measurement process, which can be simply understood as the number of temperature measurements, and n is the total number of temperature measurement data samples of the object being measured. For example, if there are two temperature measurement channels and n is 2, is the actual temperature of the object under test at the time of the i-th temperature measurement. Specifically, the above formula shows that the actual temperature value is obtained by introducing the relationship coefficient a reflecting the emissivity and wavelength of the object under test to correct the blackbody temperature. By inputting the obtained relationship coefficient a and the blackbody temperature obtained by each temperature measurement channel into the formula, the actual temperature of the object under test can be accurately output to improve the accuracy of temperature measurement.

[0040] According to some embodiments of the present invention, the blackbody temperature of a blackbody cavity is obtained through blackbody radiation, including: collecting blackbody radiation to form a light signal. Specifically, the radiation energy in the blackbody cavity can be gathered according to a certain viewing angle through a detection probe such as a lens structure and sent into a transmission optical fiber. The light signal is transmitted to two narrowband source light sheets of different wavelengths through the transmission optical fiber, and the light signal can be converted into an electrical signal through a photodetector. The voltage signal converted by the photodetector is amplified by an amplifier circuit, and then collected by a single-chip microcomputer to a terminal processor for data colorimetric processing to obtain the blackbody temperature.

[0041] According to some embodiments of the present invention, the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement also includes: setting a plurality of measured objects in the boiler, and obtaining the actual temperatures of the plurality of measured objects; obtaining the distribution of damage states at different positions inside the furnace of the boiler according to the actual temperatures of the plurality of measured objects. Among them, by setting a plurality of measured objects in the boiler, the plurality of measured objects can be distributed at different positions in the boiler, so that the temperature distribution in the boiler can be more accurately obtained by obtaining the actual temperatures of the plurality of measured objects, so that the damage states of high-temperature components at different positions in the boiler can be calculated and analyzed based on the mathematical model of thermoelastic-plastic creep analysis. In other words, by increasing the temperature measurement positions in the boiler, the operating personnel can know the overall damage of the boiler more accurately and comprehensively, so that the operating personnel can perform relevant maintenance and adjustment operations according to the damage conditions to ensure the stable and reliable operation of the boiler.

[0042] According to some embodiments of the present invention, after calculating the actual temperature of the object under test, it also includes: displaying and recording the actual temperature obtained, and issuing a high temperature warning after the actual temperature exceeds the set threshold. Among them, by displaying the actual temperature of the object under test, the operating personnel can know the actual temperature of the object under test more intuitively, and by recording the actual temperature, a continuous measurement database of the temperature of the object under test can be formed, which is convenient for subsequent calls to determine the temperature rise trend of the object under test, etc., and when the actual temperature exceeds the set threshold, it indicates that there is a high risk of damage. By issuing a high temperature warning, the operating personnel can promptly discover potential accidents to reduce losses.

[0043] The second aspect of the present invention proposes a boiler operation damage analysis system based on blackbody cavity radiation temperature measurement.

[0044] According to the second aspect of the present invention, the boiler operation damage analysis system based on blackbody cavity radiation temperature measurement is used to execute the boiler operation damage analysis method based on blackbody cavity radiation temperature measurement in any of the above embodiments. The boiler operation damage analysis system based on blackbody cavity radiation temperature measurement includes: a blackbody cavity radiation optical fiber temperature measurement subsystem and a boiler operation damage analysis subsystem. The blackbody cavity radiation optical fiber temperature measurement subsystem includes a temperature acquisition module and a signal processing module. The temperature acquisition module includes a blackbody cavity sensor, a receiving unit and a transmission optical fiber. The blackbody cavity sensor is used to receive the thermal radiation of the object under test in the boiler to generate blackbody radiation and generate an optical signal. The receiving unit is used to receive the optical signal of the blackbody cavity sensor and transmit it to the transmission optical fiber. The transmission optical fiber is used to transmit the optical signal to the signal processing module. The signal processing module is used to convert the optical signal into the blackbody temperature. The boiler operation damage analysis subsystem includes a temperature conversion module and an analysis output module. The temperature conversion module is used to convert the blackbody temperature into the actual temperature of the object under test. The analysis output module is used to analyze the damage of the object under test according to the actual temperature of the object under test and output the damage.

[0045] According to the boiler operation damage analysis system based on blackbody cavity radiation temperature measurement in the second aspect of the embodiment of the present invention, the relationship coefficient between the emissivity and wavelength of the object to be measured is obtained by comparing the actual response of the blackbody cavity sensor with the reference response, and the actual temperature of the object to be measured is obtained by correcting the blackbody temperature through the above relationship coefficient. The accuracy of the obtained temperature of the object to be measured can be improved, thereby improving the accuracy of the internal damage of the boiler output by the boiler operation damage analysis method, so that the operating personnel can discover the damage problem in time, and provide a reliable basis for the operating personnel to accurately understand the usage of the boiler.

[0046] Among them, the boiler operation damage analysis system based on blackbody cavity radiation temperature measurement includes a power module, so as to supply power to the blackbody cavity radiation optical fiber temperature measurement subsystem and the boiler operation damage analysis subsystem through the power module.

[0047] According to some embodiments of the present invention, the boiler operation damage analysis subsystem further includes a wireless communication module, and the temperature conversion module is connected to the analysis output module through the wireless communication module to transmit the actual temperature of the object under test to the analysis output module. Thus, wireless transmission is not limited by space, and at the same time, space for arranging the transmission harness can be saved, reducing the difficulty of arranging the boiler operation damage analysis system.

[0048] According to some embodiments of the present invention, the analysis output module includes an analysis unit and an output unit, wherein the analysis unit is used to analyze the damage of the object under test according to the actual temperature of the object under test, and the output unit includes a display component, wherein the display component is used to display the damage of the object under test. Thus, by displaying the damage through the display component, it is convenient for the operating personnel to more intuitively and timely discover the hidden dangers of accidents, so that they can quickly respond and execute corresponding remedial measures to reduce losses.

[0049] According to some embodiments of the present invention, the boiler operation damage analysis subsystem further includes: a compressed air cooling module, which is used to deliver compressed air toward the blackbody cavity sensor and cool the blackbody cavity sensor. Therefore, during the operation of the blackbody cavity radiation fiber optic temperature measurement subsystem, when the temperature of the blackbody cavity sensor exceeds the threshold, the blackbody cavity sensor can be cooled by the compressed air cooling module to avoid overheating damage and ensure the measurement accuracy of the blackbody cavity radiation fiber optic temperature measurement subsystem. In addition, the dust and impurities on the blackbody cavity sensor can be removed by uniform airflow distribution, dynamic airflow adjustment, removal of thermal radiation interference, and cleaning function to prevent the accumulation of pollutants, and the temperature distribution can be balanced to reduce thermal radiation interference, ensuring the stable and reliable operation of the blackbody cavity radiation fiber optic temperature measurement subsystem.

[0050] Specifically, the blackbody cavity radiation fiber temperature measurement subsystem includes a temperature acquisition module, a transmission fiber, a temperature package circuit including a temperature sensor, and a signal processing module. The temperature acquisition module uses the refraction and convergence effect of the lens to transfer the radiation containing temperature information to the transmission fiber to realize the acquisition and transmission of temperature information. The signal processing module is used to connect multiple temperature acquisition modules through the temperature package circuit, including a photoelectric conversion unit and an electrical measurement display unit. The photoelectric conversion unit includes an interference narrowband filter, a FET (Field Effect Transistor: field effect tube)-PD (Photo-Diode: photodiode) photoelectric detector and an integrated analog signal processing circuit to eliminate background interference and long-distance transmission noise interference. The electrical measurement display unit includes an operation panel, a microprocessor, a weak current amplifier, a single-chip microcomputer A / D and a LabVIEW (Laboratory Virtual Instrument Engineering Workbench: graphical programming language) virtual instrument interface, which can complete the weak current amplifier control and A / D conversion start and stop under the control of the microprocessor, and complete the command input and temperature signal output through the operation panel keyboard. The operation includes reset, clear, amplifier range writing, etc.

[0051] The boiler operation damage analysis subsystem is connected with the signal processing module data, including a temperature conversion module, a power module, a wireless communication module, an analysis output module, and a compressed air cooling module.

[0052] When arranging a boiler operation damage analysis system based on blackbody cavity radiation temperature measurement, during the on-site installation of the temperature measurement points in the furnace, first install the blackbody cavity pipe clamp at the three installation points on the tube bank. The blackbody cavity pipe clamp can be installed on the pipeline by bolting, and ensure that the fixed position is parallel to the pipeline. During the installation process, adjust the position of the blackbody cavity pipe clamp so that the blackbody cavity is close to the pipe wall to ensure that the blackbody cavity is in full contact with the pipe wall of the heating surface pipe, so that the blackbody cavity can more accurately receive the thermal radiation emitted by the pipe wall of the heating surface pipe. Among them, it is necessary to wipe the surface of the blackbody cavity to ensure its cleanliness, and check the surface condition to ensure its integrity. Subsequently, the blackbody cavity sensor is passed through the orifice of the blackbody cavity and fixed in the blackbody cavity with a top screw or similar clamp to maintain a stable position and prevent the probe from loosening or shaking.

[0053] The blackbody cavity sensor has high temperature resistance and is composed of a lens, a clamping structure and a transmission optical fiber. The lens gathers the radiation energy of the object to be measured at a certain viewing angle during measurement and sends it into the transmission optical fiber for transmission. The lens has a diameter of 15mm and is made of ultraviolet fused quartz. The focal length D=35mm. The clamping structure is used to clamp and fix the lens, and the material is 304 stainless steel. At the same time, the blackbody cavity sensor connects the receiving unit and the transmission optical fiber. The receiving unit is composed of a lens group and a fiber collimator, which is used to collect and collimate the radiation light, and then transmit it to the transmission optical fiber, that is, to adjust the light into parallel light or a beam in a specific direction for coupling into the transmission optical fiber. The transmission optical fiber is a sapphire optical fiber, specifically a 100um multi-mode inhomogeneous optical fiber. The core refractive index decreases with the increase of radius, and a smaller mode dispersion can be obtained.

[0054] During the entire installation process, the angle and position of the blackbody cavity sensor probe need to be constantly adjusted to ensure that it is properly positioned and not easily affected by smoke blowing, which can lead to inaccurate data or lens contamination. Finally, a comprehensive safety check is performed to ensure that all equipment is installed firmly and stably without causing any impact or safety hazards to pipeline operation.

[0055] After installation, preheat for two minutes, aim the probe at the object to be measured, set the measuring distance, adjust the probe angle, and the current displayed value is its highest temperature value.

[0056] Start temperature measurement. The temperature measurement process is as follows: The high temperature resistant black body cavity sensor is directly contacted with the high temperature source to be measured. The black body radiation emitted by the heated black body cavity is transmitted through a closed space. The optical signal of the fiber grating enters the receiving unit. The receiving unit collects and collimates the radiation light and inputs it into the transmission optical fiber, that is, the light is adjusted to parallel light or a beam of a specific direction for coupling into the transmission optical fiber. The optical signal is transmitted from the measurement site to two interference narrow band source light sheets of different wavelengths through the transmission optical fiber, and is converted into a voltage signal after passing through the FET-PD photoelectric detector, amplified by a weak current amplifier, and then collected by the single chip A / D to the microprocessor for data colorimetric processing. Finally, the temperature can be displayed in the Labview virtual instrument interface, such as a three-dimensional temperature field. At the same time, the temperature conversion module is connected to the black body cavity radiation optical fiber temperature measurement subsystem, so that the temperature conversion module can receive the black body temperature obtained by the black body cavity radiation optical fiber temperature measurement subsystem, and calculate and obtain the actual temperature of the object to be measured, and transmit the actual temperature of the object to be measured to the analysis output module through the wireless communication module. The analysis output module analyzes the damage state of the object to be measured and displays the analysis structure.

[0057] At the same time, the power supply module is used to provide power for the blackbody cavity radiation fiber optic temperature measurement subsystem and the boiler operation damage analysis subsystem. The compressed air cooling module is used to cool down the components of the temperature measurement system when the system is running, when the temperature exceeds the threshold, when the ambient temperature is high, and during maintenance and cleaning, to protect the components from overheating damage to maintain measurement accuracy. At the same time, through uniform airflow distribution, dynamic airflow adjustment, removal of thermal radiation interference, and combined cleaning function, dust and impurities are removed, pollutant accumulation is prevented, and temperature distribution is balanced to reduce thermal radiation interference, thereby ensuring stable and reliable operation of the system.

[0058] The blackbody cavity radiation fiber temperature measurement subsystem should be able to monitor the temperature in different environments, detect potential accidents as early as possible, and minimize losses. At the same time, it provides a large amount of online monitoring data to provide a reliable basis for operators to fully understand the use of the equipment. The system detects the entire monitoring area in real time, monitors the real-time temperature of the area, covers the monitoring area 100%, and has no blind spots.

[0059] Real-time temperature information and alarm information can be automatically maintained. The system displays the current temperature in real time and can record the peak value. It has functions such as threshold setting. It is best used under special working conditions such as strong electromagnetic field interference, strong background light, strong chemical corrosion and severe dust pollution. It is an ideal tool for measuring flow injection, kiln furnace, high-frequency induction heating, hot-rolled forgings, point temperature and temperature field distribution.

[0060] In another embodiment, the blackbody cavity sensor uses quartz optical fiber as the transmission optical fiber; the core diameter of a single quartz optical fiber is 200 μm, and the measurement process using the quartz optical fiber is as follows: the blackbody cavity sensor is directly placed in the temperature environment to be measured, the blackbody cavity quickly senses heat and radiates infrared light signals, the light signal from the blackbody radiation cavity is transmitted along the optical fiber to the low-temperature optical fiber, the light output of the low-temperature optical fiber passes through a notch filter and is detected by a photodetector based on a photodiode, the photodiode uses the Planck relationship to convert light of a specific wavelength into current, the analog signal is adjusted by a weak current amplifier, and the microprocessor converts the analog signal into usable engineering temperature units for display.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A boiler operation damage analysis method based on blackbody cavity radiation temperature measurement, characterized in that: include: The blackbody cavity of the blackbody cavity sensor receives the thermal radiation of the object to be measured in the boiler to generate blackbody radiation, and the blackbody temperature is obtained through the blackbody radiation; Calculating a reference response of the blackbody cavity sensor, wherein the reference response is the intensity of an electrical signal or a light signal output by the blackbody cavity sensor after receiving radiation energy from the object being measured when the blackbody cavity is set as an absolute blackbody; Acquiring an actual response of the blackbody cavity sensor, where the actual response is the intensity of an electrical signal or optical signal output by the blackbody cavity sensor after receiving radiation energy from the object being measured; The relationship coefficient a between the emissivity and the wavelength of the object under test is obtained according to the actual response amount and the reference response amount of the black body cavity sensor, and the actual temperature of the object under test is calculated according to the relationship coefficient a between the emissivity and the wavelength and the measured black body temperature; Based on the thermoelastic-plastic creep analysis mathematical model and the actual temperature of the object being measured, the damage condition of the object being measured is analyzed and obtained, and the damage condition is output.

2. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to claim 1 is characterized in that: The method of obtaining the relationship coefficient a between the emissivity and the wavelength of the object under test according to the actual response and the reference response of the blackbody cavity sensor comprises: when the object under test is an absolute blackbody, based on formula 1 and formula 2, establishing the equation of each temperature measurement channel and solving them simultaneously to obtain the reference response, thereby obtaining formula 3; Formula 1: ; Formula 2: ; Formula 3: ; Wherein, V is the actual response of the blackbody cavity sensor, V' is the reference response of the blackbody cavity sensor, A is the temperature measurement coefficient of the blackbody cavity radiation optical fiber temperature measurement subsystem, λ is the wavelength of the object being measured, e is the natural logarithm, C2 is the relationship coefficient between the blackbody temperature and the brightness temperature, i is the index of the temperature measurement data sample of the object being measured, indicating the number of multiple data samples collected during the temperature measurement process, T is the blackbody temperature, is the emissivity of the object being measured, n is the total number of temperature measurement data samples of the object being measured, and a is the relationship coefficient between emissivity and wavelength.

3. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to claim 2 is characterized in that: The actual temperature of the object to be measured is calculated according to the relationship coefficient a between the emissivity and the wavelength and the measured black body temperature, including: substituting the relationship coefficient a into the calculation formula: ； Get the actual temperature of the object under test, where Y is the actual temperature of the object under test, T is the blackbody temperature of each temperature measurement channel, i is the index of the temperature measurement data sample of the object under test, indicating the number of multiple data samples collected during the temperature measurement process, and n is the total number of temperature measurement data samples of the object under test.

4. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to claim 1 is characterized in that: The method of obtaining the blackbody temperature of the blackbody cavity by blackbody radiation includes: Collect blackbody radiation and form optical signals, transmit the optical signals to two narrowband source light sheets with different wavelengths through transmission optical fibers, and convert them into voltage signals through photodetectors; After the voltage signal is amplified by the amplifier circuit, it is collected by the single-chip microcomputer and sent to the terminal processor for data colorimetric processing to obtain the black body temperature.

5. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to claim 1 is characterized in that: Also includes: A plurality of objects to be measured are arranged in the boiler, and actual temperatures of the plurality of objects to be measured are obtained; According to the actual temperatures of the plurality of measured objects, the distribution of damage states at different positions inside the furnace of the boiler is obtained.

6. The boiler operation damage analysis method based on blackbody cavity radiation temperature measurement according to claim 1 is characterized in that: After calculating the actual temperature of the object being measured, it also includes: Display and record the actual temperature obtained, and issue a high temperature warning when the actual temperature exceeds the set threshold.

7. A boiler operation damage analysis system based on blackbody cavity radiation temperature measurement, characterized in that: The method for analyzing boiler operation damage based on blackbody cavity radiation temperature measurement according to any one of claims 1 to 6 comprises: A blackbody cavity radiation optical fiber temperature measurement subsystem includes a temperature acquisition module and a signal processing module. The temperature acquisition module includes a blackbody cavity sensor, a receiving unit and a transmission optical fiber. The blackbody cavity sensor is used to receive the thermal radiation of the object to be measured in the boiler to generate blackbody radiation and generate an optical signal. The receiving unit is used to receive the optical signal of the blackbody cavity sensor and transmit it to the transmission optical fiber. The transmission optical fiber is used to transmit the optical signal to the signal processing module. The signal processing module is used to convert the optical signal into a blackbody temperature. The boiler operation damage analysis subsystem includes a temperature conversion module and an analysis output module, which are used to convert the black body temperature into the actual temperature of the object under test. The analysis output module is used to analyze the damage condition of the object under test according to the actual temperature of the object under test and output the damage condition.

8. The boiler operation damage analysis system based on blackbody cavity radiation temperature measurement according to claim 7 is characterized in that: The boiler operation damage analysis subsystem further includes a wireless communication module, and the temperature conversion module is communicatively connected with the analysis output module via the wireless communication module to transmit the actual temperature of the measured object to the analysis output module.

9. The boiler operation damage analysis system based on blackbody cavity radiation temperature measurement according to claim 7 is characterized in that: The analysis and output module includes an analysis unit and an output unit. The analysis unit is used to analyze the damage of the object under test according to the actual temperature of the object under test. The output unit includes a display component, and the display component is used to display the damage of the object under test.

10. The boiler operation damage analysis system based on blackbody cavity radiation temperature measurement according to claim 7 is characterized in that: The boiler operation damage analysis subsystem further includes: a compressed air cooling module, wherein the compressed air cooling module is used to transport compressed air toward the blackbody cavity sensor to cool the blackbody cavity sensor.

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