Calibration device and calibration method for ultra-short thermocouple

Abstract

The present invention discloses a calibration device and calibration method for an ultra-short thermocouple, which comprises a combustion chamber, a clamping mechanism, an adjusting mechanism and a data acquisition device. A flame supply mechanism is arranged in the combustion chamber, the flame supply mechanism is used to provide flame, a thermocouple to be tested and a standard thermocouple are fixed on the clamping mechanism, and the clamping mechanism is connected to the adjusting mechanism. The present invention obtains an infrared image of a flame and its temperature distribution through an infrared thermal imaging mechanism, adjusts the positions of the thermocouple to be tested and the standard thermocouple, and thereby makes the thermocouple to be tested and the standard thermocouple at a suitable temperature of the outer flame of a stably burning flame; cooperates with the data acquisition device to collect the temperature data of the thermocouple to be tested and the standard thermocouple, and realizes the calibration operation of the thermocouple to be tested, which is simple to operate and has a low detection and calibration cost, solves the problem that the existing thermocouple calibration and verification device cannot calibrate the ultra-short thermocouple, can quickly and accurately calibrate the ultra-short thermocouple, and effectively improves the measurement efficiency and accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of thermocouple calibration, and in particular to a calibration device and a calibration method for an ultra-short thermocouple. Background Art

[0002] The measurement and control of temperature in the steelmaking process is a very important element in the entire smelting process. At present, the temperature measurement of the converter steelmaking process is mainly the temperature measurement of the furnace in front of the furnace, and the temperature measuring element used for the temperature measurement of the furnace is mainly a fast thermocouple. Since the temperature measuring probes in front of the furnace are disposable consumables, the wire used for the fast thermocouple for temperature measurement is designed to be very short, generally around 30mm. In recent years, the steel industry has an increasingly high demand for temperature measurement and control, so the calibration and detection of temperature measuring elements is urgently needed. At present, the calibration and verification methods and procedures of thermocouples are basically based on long thermocouples. For example, the scope of application of the current effective verification procedure JJF1637-2017 is the verification of thermocouples with a length of not less than 500mm and a temperature range of less than 1200℃. For short thermocouples, the current effective procedures are only applicable to 200-700mm. The calibration and verification methods for ultra-short thermocouples (length of 30mm) are currently in urgent need of resolution.

[0003] Temperature is crucial to the quality of molten steel, so the accuracy of temperature measurement has a great impact on the steelmaking process. It is urgent to develop a technical method to solve the problem of fast, economical and effective calibration of ultra-short couplers in the steel industry. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a calibration device and calibration method for ultra-short thermocouples, which can effectively detect and calibrate ultra-short thermocouples and solve the problem of calibration and verification of ultra-short fast couples for converter temperature measurement.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a calibration device for an ultra-short thermocouple, which includes a combustion chamber, a clamping mechanism, an adjusting mechanism and a data acquisition device. A flame supply mechanism is arranged in the combustion chamber, and the flame supply mechanism is used to provide a flame for gas combustion. The thermocouple to be measured and a standard couple are fixed on the clamping mechanism. The clamping mechanism is connected to the adjusting mechanism. The data acquisition device is connected to the thermocouple to be measured and the standard couple. An infrared thermal imaging mechanism is arranged on one side of the combustion chamber.

[0006] In one embodiment, the flame supply mechanism includes a combustion tube, one end of which is placed in a combustion chamber, and the other end of which is connected to a gas mixing chamber, and the gas mixing chamber is used to provide fuel gas and oxygen.

[0007] In one embodiment, the gas mixing chamber is provided with an air inlet, the air inlet is connected to a gas inlet pipe and an oxygen inlet pipe, both the gas inlet pipe and the oxygen inlet pipe are connected to regulating valves, and the two regulating valves are used to adjust the gas flow in the gas inlet pipe and the oxygen inlet pipe, respectively.

[0008] In one of the embodiments, a concentration detector is further included, and the concentration detector is used to monitor the gas concentration value in the gas mixing chamber, and the regulating valve is controlled according to the monitoring result of the concentration detector.

[0009] In one embodiment, the flame supply mechanism further includes a flame control device, which is connected to the combustion tube and is used to control the size of the flame.

[0010] In one embodiment, it includes an exhaust mechanism, which is connected to the combustion chamber. The exhaust mechanism is also provided with an exhaust valve, which is used to control the exhaust flow rate of the exhaust gas generated by the combustion of the gas.

[0011] In one embodiment, exhaust holes are arranged at intervals on the combustion chamber, and the exhaust gas generated by the combustion of the gas is discharged through the exhaust holes.

[0012] In one embodiment, the thermocouple to be measured is arranged flush with the end of the standard thermocouple, and the thermocouple to be measured is arranged in parallel with the standard thermocouple.

[0013] A method for calibrating an ultra-short thermocouple comprises the following steps:

[0014] Adjust the volumetric mixing ratio of oxygen and fuel gas to the preset value;

[0015] Obtain infrared images of flames and their temperature distribution;

[0016] Adjust the positions of the thermocouple to be tested and the standard thermocouple until the flame burns stably;

[0017] Collect the temperature readings of the thermocouple to be tested, the temperature readings of the standard thermocouple, and the temperature data at the point where the flame is stable, and process the data to obtain the average value of the display error.

[0018] Get the corrected temperature reading of the thermocouple to be tested x refers to the temperature reading of the thermocouple to be measured, represents the average value of display error, a represents the flame fluctuation error, and k represents the flame fluctuation influence factor.

[0019] In one embodiment, the step collects the temperature reading value of the thermocouple to be tested, the temperature reading value of the standard thermocouple and the temperature data at the stable flame combustion point, and performs data processing to obtain the display error average value. Previously, it also included:

[0020] Fine-tune the flame combustion so that the flame combustion temperature remains within a stable value range.

[0021] In summary, the ultra-short thermocouple calibration device and calibration method of the present invention obtains the infrared image of the flame and its temperature distribution through an infrared thermal imaging mechanism, adjusts the positions of the thermocouple to be tested and the standard couple, and thus makes the thermocouple to be tested and the standard couple at a suitable temperature of the outer flame of the stably burning flame; cooperates with the use of a data acquisition device to collect the temperature data of the thermocouple to be tested and the standard couple, and realizes the calibration operation of the thermocouple to be tested. The operation is simple and the detection and calibration cost is low, which solves the problem that the existing thermocouple calibration and verification device cannot calibrate the ultra-short couple, and can quickly and accurately calibrate the ultra-short couple, effectively improving the measurement efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a calibration device for an ultra-short thermocouple of the present invention;

[0023] Figure 2 A schematic flow chart of a calibration method for an ultra-short thermocouple according to the present invention;

[0024] Figure 3 The figure is a flow chart of another embodiment of a calibration method for an ultra-short thermocouple according to the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 The present invention provides an ultra-short thermocouple calibration device, comprising a combustion chamber 10, a clamping mechanism 20, an adjusting mechanism 30 and a data acquisition device 40. A flame supply mechanism 50 is provided in the combustion chamber 10, and the flame supply mechanism 50 is used to provide a flame for gas combustion. A thermocouple to be measured 61 and a standard thermocouple 62 are fixed on the clamping mechanism 20. The length of the thermocouple to be measured 61 is less than 44 mm. Preferably, the length of the thermocouple to be measured 61 is not more than 30 mm. The ends of the thermocouple to be measured 61 and the standard thermocouple 62 are arranged flush, the thermocouple to be measured 61 and the standard thermocouple 62 are arranged in parallel, and the spacing between the thermocouple to be measured 61 and the standard thermocouple 62 is less than 2 mm, so that the temperature contact points of the thermocouple to be measured 61 and the standard thermocouple 62 are arranged as close as possible, thereby improving the accuracy of the temperature measurement calibration of the thermocouple to be measured 61.

[0029] In one embodiment, the thermocouple to be tested 61 and the standard thermocouple 62 are externally covered with a ceramic protection tube (not shown) so that the thermocouple to be tested 61 and the standard thermocouple 62 are heated evenly during the calibration measurement process to improve the calibration accuracy of the thermocouple to be tested 61.

[0030] In this embodiment, the thermocouple to be tested 61 and the standard couple 62 are arranged horizontally, and the clamping mechanism 20 is connected to the adjusting mechanism 30. The adjusting mechanism 30 is used to adjust the horizontal or vertical position of the clamping mechanism 20, and then adjust the thermocouple to be tested 61 and the standard couple 62 to move into the flame, so that the thermocouple to be tested 61 and the standard couple 62 are placed in the same place where the temperature of the outer flame of the flame is stable; the thermocouple to be tested 61 and the standard couple 62 can also be set at a preset position as needed, and the adjusting mechanism 30 only needs to adjust the horizontal position of the clamping mechanism 20 to move the thermocouple to be tested 61 and the standard couple 62 into the flame; specifically, the adjusting mechanism 30 is provided with an X-axis adjustment module, a Y-axis adjustment module and a Z-axis adjustment module. This structure is a common means used by technicians in this field and does not need to be elaborated here.

[0031] The data acquisition device 40 is connected to the thermocouple to be measured 61 and the standard thermocouple 62, and is used to collect temperature data detected after the thermocouple to be measured 61 and the standard thermocouple 62 enter the flame, so as to facilitate the determination of the temperature measurement difference between the thermocouple to be measured 61 and the standard thermocouple 62, and further realize the temperature measurement calibration of the thermocouple to be measured 61.

[0032] In one embodiment, the flame supply mechanism 50 includes a combustion tube 51, one end of which is placed in the combustion chamber 10, and the other end of the combustion tube 51 is connected to a gas mixing chamber 52, and the gas mixing chamber 52 is used to provide fuel gas and oxygen; the flame supply mechanism 50 also includes a flame control device 53, which is connected to the combustion tube 51, and the flame control device 53 is used to control the size of the flame.

[0033] In other embodiments, alternatively, the flame control device 53 can be eliminated, and the gas delivered to the combustion tube 51 can be ignited by an external fire source, which needs no further explanation.

[0034] In one embodiment, the gas mixing chamber 52 is provided with an air inlet, and the air inlet is connected to a gas inlet pipe 54 and an oxygen inlet pipe 55. The gas inlet pipe 54 and the oxygen inlet pipe 55 are both connected to regulating valves 56. The two regulating valves 56 are respectively used to adjust the gas flow in the gas inlet pipe 54 and the oxygen inlet pipe 55, so that the gas and oxygen entering the gas mixing chamber 52 can be well mixed, so that the combustion effect of the flame is more stable.

[0035] In one embodiment, the calibration device of the ultra-short thermocouple also includes a concentration detector 70, which is used to monitor the gas concentration value in the gas mixing chamber 52. The regulating valve 56 is controlled by the monitoring result of the concentration detector 70, so that the volume mixing ratio of oxygen and gas in the gas mixing chamber 52 reaches a preset value, thereby ensuring the stability of the flame combustion effect provided by the flame supply mechanism 50.

[0036] In one embodiment, the calibration device of the ultra-short thermocouple also includes an exhaust mechanism 80, which is connected to the combustion chamber 10. The exhaust mechanism 80 is also provided with an exhaust valve 81. The exhaust valve 81 is used to control the exhaust flow rate of the exhaust gas generated by the combustion of the gas, and at the same time cooperate with the regulating valve 56 to fine-tune the gas concentration in the gas mixing chamber 52, so that the flame always achieves the expected stable combustion effect and the flame reaches a stable combustion state.

[0037] In one embodiment, exhaust holes 11 are arranged at intervals at the upper end of the combustion chamber 10. The exhaust gas generated by the combustion of the gas will be discharged through the exhaust holes 11 and enter the exhaust mechanism 80, and then guided into the external exhaust gas collection device through the exhaust mechanism 80 to avoid affecting the environment.

[0038] In one embodiment, an infrared thermal imaging mechanism 90 is provided on one side of the combustion chamber 10 for monitoring the contour of the flame and its temperature distribution. The infrared thermal imaging mechanism 90 is an infrared thermal imaging camera. The infrared thermal imaging mechanism 90 monitors the flame to obtain its infrared image and its temperature distribution. The positions of the thermocouple to be tested 61 and the standard thermocouple can be adjusted according to the infrared image results, so that the thermocouple to be tested 61 and the standard thermocouple 62 are at a suitable temperature of the outer flame of the stably burning flame (i.e., the temperature point that needs to be calibrated).

[0039] When the ultra-short thermocouple calibration device of the present invention is working, the regulating valve 56 is opened, and the concentration detector 70 is cooperated to monitor the gas concentration in the gas mixing chamber 52, so that the volume mixing ratio of oxygen and gas in the gas mixing chamber 52 reaches a preset value; the flame control device 53 is opened, the flame is ignited, and the flame combustion condition and flame temperature are monitored in real time through the infrared thermal imaging mechanism 90, and the gas concentration is fine-tuned in conjunction with the regulating valve 56, so that the flame achieves the expected stable combustion effect and stable combustion state; then the positions of the thermocouple to be tested 61 and the standard thermocouple 62 are adjusted according to the infrared image and temperature distribution of the flame, so that the thermocouple to be tested 61 and the standard thermocouple 62 are in a stable state. 62 is at a suitable temperature of the outer flame of the stably burning flame; finally, the data acquisition device 40 is used to collect the temperature data of the thermocouple to be tested 61 and the standard couple 62, and the infrared thermal imaging mechanism 90 is used to monitor the real-time temperature of the flame. The temperature reading value of the thermocouple to be tested 61 is used to realize the calibration operation of the thermocouple to be tested 61. The operation is simple and the detection and calibration cost is low. The device is easy to implement, which solves the problem that the existing thermocouple calibration and verification device cannot calibrate the ultra-short couple, and can quickly and accurately calibrate the ultra-short couple. Compared with the existing device, it is more suitable for the application of rapid ultra-short couple calibration in the steel field, and can effectively improve the measurement efficiency and accuracy.

[0040] See also Figure 2According to the above-mentioned ultra-short thermocouple calibration device of the present invention, the present invention provides a calibration method for ultra-short thermocouples. The combustion chamber 10, the clamping mechanism 20, the adjustment mechanism 30, the data acquisition device 40, the flame supply mechanism 50 and the infrared thermal imaging mechanism 90 involved in the method can be the same as the technical features described in the above-mentioned ultra-short thermocouple calibration device embodiment, and can produce the same technical effects. The ultra-short thermocouple calibration method of the present invention, by placing the thermocouple 61 to be tested and the standard thermocouple at the appropriate temperature of the flame, using the data acquisition device 40 in conjunction with the infrared thermal imaging mechanism 90 to obtain the temperature reading value of the thermocouple 61 to be tested, realizes the calibration operation of the thermocouple 61 to be tested, is easy to operate and has low detection and calibration costs. The present invention solves the shortcomings of existing thermocouple calibration. The method can quickly and accurately calibrate the ultra-short thermocouple. Compared with the existing method, it is more suitable for the application of rapid ultra-short thermocouple calibration in the steel field, and can effectively improve the measurement efficiency and accuracy.

[0041] A method for calibrating an ultra-short thermocouple comprises the following steps:

[0042] S1. Adjust the volume mixing ratio of oxygen and fuel gas to a preset value; the concentration detector 70 monitors the fuel gas concentration in the gas mixing chamber 52, and controls the regulating valve 56 to control the gas flow rates of the fuel gas inlet pipe 54 and the oxygen inlet pipe 55 respectively, so as to ensure that the volume mixing ratio of oxygen and fuel gas in the gas mixing chamber 52 reaches the preset value.

[0043] In this embodiment, the fuel gas can be selected from at least one of acetylene, propane, propylene, methane, hydrogen, etc. as needed, wherein the preset value of the volume ratio of oxygen to acetylene is 1.1-1.2. At this time, acetylene is in a fully burned state, the flame is a neutral flame, and the volume ratio parameter values ​​of oxygen to other fuel gases are shown in the following table:

[0044]

[0045] S2, obtaining an infrared image of the flame and its temperature distribution; obtaining an infrared image of the flame and its temperature distribution in real time through the infrared thermal imaging mechanism 90.

[0046] Furthermore, the specific parameters of the volume ratio of oxygen to fuel gas in step S1 can be dynamically fine-tuned according to the real-time monitoring data of the infrared thermal imaging mechanism 90, so as to ensure the stability of the flame generated by the combustion of the fuel gas.

[0047] S3. Adjust the positions of the thermocouple to be tested 61 and the standard thermocouple 62 to where the flame burns stably; drive the clamping mechanism 20 to move by the adjusting mechanism 30, so that the thermocouple to be tested 61 and the standard thermocouple 62 protected by the ceramic protection tube can be moved to where the flame burns stably, ensuring that the thermocouple to be tested 61 and the standard thermocouple 62 are in a suitable flame temperature area, thereby facilitating temperature measurement and calibration of the thermocouple to be tested 61.

[0048] In this embodiment, the temperature at the point where the flame burns stably is maintained at about 1600° C. to facilitate the temperature measurement and calibration operation of the thermocouple 61 to be measured.

[0049] S4, collect the temperature reading value of the thermocouple 61 to be tested, the temperature reading value of the standard thermocouple 62 and the temperature data at the stable flame combustion point, and perform data processing to obtain the average value of the display error The temperature reading value of the thermocouple to be tested 61 and the temperature reading value of the standard thermocouple 62 are monitored in real time by the data acquisition device 40, and the temperature data value at the stable flame combustion is monitored in real time by the infrared thermal imaging mechanism 90. In this embodiment, data is automatically collected every one minute, and a total of 20 minutes of collected data is recorded, and data processing is performed, wherein the test data and data processing results are shown in the following table:

[0050]

[0051] It can be seen from the example data in the above table that the average value of the display value error of the thermocouple 61 to be tested is 2.9°C, the fluctuation of the display value error is 3.4-2.4=1.0, and the flame temperature fluctuation range is -4.1°C to 6.0°C.

[0052] S5. Obtain the corrected temperature reading value of the thermocouple 61 to be tested x refers to the temperature reading value of the thermocouple 61 to be measured, refers to the average value of the display error, a refers to the flame fluctuation error, and k refers to the flame fluctuation influence factor. a can be calculated by the middle value of the flame temperature fluctuation value C in the collected temperature data, that is, In this embodiment, the maximum value max(C) of the flame fluctuation value C is 6.0°C, and the minimum value min(C) of the flame fluctuation value C is -4.1°C, so a=0.95; k can be calculated by the average value of the flame temperature in the collected temperature data and the average value of the standard even temperature reading, that is, In this embodiment, the average flame temperature is 1627.9° C., the average standard couple temperature reading is 1624° C., and k=-0.435.

[0053] See also Figure 3 In one embodiment, before step S4, the step further includes

[0054] S6. Fine-tune the flame combustion so that the flame combustion temperature remains within a stable value range. In this embodiment, the stable value is selected as 1600°C, and the stable value range is 1550-1650°C to meet the temperature measurement conditions in the steelmaking process. Specifically, the infrared image temperature distribution of the flame is monitored in real time by the infrared thermal imaging mechanism 90, and the gas concentration value and the exhaust flow rate are controlled respectively in conjunction with the regulating valve 56 and the exhaust valve 81, so that the temperature of the outer flame of the flame remains within the stable value range.

[0055] In this embodiment, the temperature of the thermocouple 61 to be tested at the flame is monitored to be stable at around 1600°C based on the infrared image temperature distribution, and the gas concentration and exhaust flow rate can be automatically adjusted according to the test temperature set by the data acquisition device and the monitoring temperature of the infrared thermal imaging mechanism 90, so that the outer flame temperature of the flame is basically stable at around 1600°C.

[0056] In summary, the calibration device and calibration method of an ultra-short thermocouple of the present invention obtains the infrared image of the flame and its temperature distribution through the infrared thermal imaging mechanism 90, adjusts the positions of the thermocouple to be tested 61 and the standard couple 62, and thus makes the thermocouple to be tested 61 and the standard couple 62 at a suitable temperature of the outer flame of the stably burning flame; cooperates with the data acquisition device 40 to collect the temperature data of the thermocouple to be tested 61 and the standard couple 62, and realizes the calibration operation of the thermocouple to be tested 61, which is simple to operate and has low detection and calibration costs, solves the problem that the existing thermocouple calibration and verification device cannot calibrate the ultra-short couple, can quickly and accurately calibrate the ultra-short couple, and effectively improves the measurement efficiency and accuracy.

[0057] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A calibration device for an ultra-short thermocouple, characterized in that: It includes a combustion chamber, a clamping mechanism, an adjusting mechanism and a data acquisition device. The combustion chamber is provided with a flame supply mechanism, which is used to provide gas combustion to generate flames. The clamping mechanism is fixed with a thermocouple to be tested and a standard couple. The clamping mechanism is connected to the adjusting mechanism. The data acquisition device is connected to the thermocouple to be tested and the standard couple. An infrared thermal imaging mechanism is provided on one side of the combustion chamber. The adjusting mechanism is connected to the clamping mechanism, and is used to adjust the positions of the thermocouple to be tested and the standard thermocouple to a position where the flame burns stably according to the infrared image captured by the infrared thermal imaging mechanism and its temperature distribution.

2. The ultra-short thermocouple calibration device according to claim 1, characterized in that: The flame supply mechanism comprises a combustion tube, one end of which is placed in a combustion chamber, and the other end of which is connected to a gas mixing chamber, and the gas mixing chamber is used to provide fuel gas and oxygen.

3. The ultra-short thermocouple calibration device according to claim 2, characterized in that: The gas mixing chamber is provided with an air inlet, which is connected to a gas inlet pipe and an oxygen inlet pipe, and both the gas inlet pipe and the oxygen inlet pipe are connected to regulating valves, which are used to regulate the gas flow in the gas inlet pipe and the oxygen inlet pipe respectively.

4. The ultra-short thermocouple calibration device according to claim 3, characterized in that: It also includes a concentration detector, which is used to monitor the gas concentration value in the gas mixing chamber, and the regulating valve is controlled according to the monitoring result of the concentration detector.

5. The ultra-short thermocouple calibration device according to claim 2, characterized in that: The flame supply mechanism also includes a flame control device, which is connected to the combustion tube and is used to control the size of the flame.

6. A calibration device for ultra-short thermocouple according to claim 1 or 2, characterized in that: The exhaust mechanism comprises an exhaust mechanism which is connected to the combustion chamber and is also provided with an exhaust valve which is used to control the exhaust flow of the exhaust gas generated by the combustion of the gas.

7. A calibration device for ultra-short thermocouple according to claim 1 or 2, characterized in that: Exhaust holes are arranged at intervals on the combustion chamber, and the waste gas generated by the combustion of the gas is discharged through the exhaust holes.

8. A calibration device for ultra-short thermocouple according to claim 1 or 2, characterized in that: The ends of the thermocouple to be tested and the standard thermocouple are arranged flush with each other, and the thermocouple to be tested and the standard thermocouple are arranged in parallel.

9. A method for calibrating an ultra-short thermocouple, characterized in that: The steps include: Adjust the volumetric mixing ratio of oxygen and fuel gas to the preset value; Obtain infrared images of flames and their temperature distribution; Adjust the positions of the thermocouple to be tested and the standard thermocouple until the flame burns stably; Collect the temperature readings of the thermocouple to be tested, the temperature readings of the standard thermocouple, and the temperature data at the point where the flame is stable, and process the data to obtain the average value of the display error. Get the corrected temperature reading of the thermocouple to be tested x refers to the temperature reading of the thermocouple to be measured, represents the average value of display error, a represents the flame fluctuation error value, and k represents the flame fluctuation influence factor.

10. The method for calibrating an ultra-short thermocouple according to claim 9, characterized in that: The step collects the temperature reading value of the thermocouple to be tested, the temperature reading value of the standard thermocouple and the temperature data at the stable flame combustion point, and performs data processing to obtain the display error average value. Previously, it also included: Fine-tune the flame combustion so that the flame combustion temperature remains within a stable value range.

Images