Self-calibration double-probe compensation type heat transfer coefficient measuring device and method

Abstract

The invention discloses a self-calibration double-probe compensation type heat transfer coefficient measuring device and method, relates to the technical field of thermotechnical detection, and realizes accurate measurement of the change of a heat transfer coefficient along with a load. The device comprises a box body; the controller and the power regulator are located in the box body; the cooling system, the electric heating equipment, the man-machine interaction device and the double probes are located outside the box body; the double probes are a first heat flow meter probe and a second heat flow meter probe which are the same in structure; the output end of the power regulator is electrically connected with the input end of the electric heating equipment; the controller is electrically connected with the control end of the power regulator, the input and output end of the man-machine interaction device and the output end of the double probe.

Description

Technical Field

[0001] This application relates to the technical field of thermal engineering detection, and particularly to a self-calibrating dual-probe compensated heat transfer coefficient measuring device and method. Background Art

[0002] CFB (Circulating Fluidized Bed) occupies an important position in the field of thermal power generation as a clean combustion technology. This technology uses the heat transfer between high-temperature materials in the furnace and the water-cooled wall to achieve heat energy conversion. With the continuous increase in the grid connection ratio of intermittent energy sources, the power grid has put forward higher requirements for the peak shaving ability of thermal power generation. CFB boilers have become the first choice for the power grid to flexibly respond to power demand fluctuations and achieve stable peak shaving due to their wide load regulation range.

[0003] When the CFB boiler operates at variable loads, the concentration of materials in the furnace will change dynamically, affecting the heat transfer coefficient of the CFB boiler, and thus having an important impact on the output characteristics of the CFB boiler. In order to accurately grasp the operating characteristics of the CFB boiler at different loads and optimize its control strategy, it is necessary to accurately measure the change of the heat transfer coefficient with the load. Summary of the Invention

[0004] In view of the above problems, this application provides a self-calibrating dual-probe compensated heat transfer coefficient measuring device and method to accurately measure the change of the heat transfer coefficient with the load. The specific solutions are as follows:

[0005] The first aspect of this application provides a self-calibrating dual-probe compensated heat transfer coefficient measuring device, including:

[0006] A box body;

[0007] A controller and a power regulator located inside the box body;

[0008] A cooling system, an electric heating device, a human-machine interaction device, and dual probes located outside the box body; the dual probes are respectively a first heat flux meter probe and a second heat flux meter probe with the same structure;

[0009] The output end of the power regulator is electrically connected to the input end of the electric heating device;

[0010] The controller is respectively electrically connected to the control end of the power regulator, the input-output end of the human-machine interaction device, and the output end of the dual probes;

[0011] The controller is configured to, during the test phase, when the second end of the first heat flux meter probe is inserted into the material to be measured and the temperature of the end face of the second end reaches a preset temperature, obtain the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe according to the pre-established correspondence curve between the temperature gradient of the first heat flux meter probe and the heat flux value of the first heat flux meter probe, calculate the heat transfer coefficient based on the obtained heat flux value, and output it through the human-machine interaction device; the curve is generated during the calibration phase by making the first ends of the dual probes in the same cold environment through the cooling system, and making the second ends of the dual probes in a synchronously dynamically changing thermal field through the power regulator and the electric heating device, when the similarity of the temperature gradient change curves of the dual probes exceeds a preset value.

[0012] In a possible implementation, the electric heating device includes: an annular heat insulation cover, electrodes, an electric heating plate, and two end plates; the annular heat insulation cover and the two end plates enclose a closed chamber, and the electric heating plate is placed in the closed chamber; the electric heating plate is electrically connected to the electrodes; the electrodes are the input ends of the electric heating device.

[0013] In a possible implementation, the annular heat insulation cover and one of the end plates enclose a first groove for the second end of the first heat flux meter probe to be inserted; the annular heat insulation cover and the other end plate enclose a second groove for the second end of the second heat flux meter probe to be inserted.

[0014] In a possible implementation, both of the dual probes are water-cooled heat flux meter probes;

[0015] The cooling system includes: the water-cooling system of the dual probes themselves, and a cooling water outlet pipe and a cooling water inlet pipe located on the outer wall of the box; the cooling water outlet pipe is connected to the probe cooling water outlet of the water-cooling system of the dual probes through a pipeline; the cooling water inlet pipe is connected to the probe cooling water inlet of the water-cooling system of the dual probes through a pipeline; regulating valves are installed at the probe cooling water inlets of the dual probes.

[0016] In a possible implementation, the water-cooled heat flux meter probe includes: a heat conduction rod, a cooling housing, and a heat insulation sleeve;

[0017] Fins are provided at the first end of the heat conduction rod, the fins are placed inside the cooling housing, and a probe cooling water outlet and a probe cooling water inlet are provided on the housing of the cooling housing;

[0018] The heat conduction rod is placed inside the heat insulation sleeve, and a test end face thermocouple is arranged on the end face of the second end of the heat conduction rod;

[0019] A thermocouple array is arranged axially on the outer surface of the heat conduction rod, and the thermocouple array includes a plurality of thermocouples arranged along the axis of the heat conduction rod;

[0020] The output end of the water-cooled heat flux meter probe includes the output end of the test end face thermocouple and the output end of the thermocouple array;

[0021] The first end and the second end of the heat conduction rod are respectively the first end and the second end of the water-cooled heat flux meter probe.

[0022] In a possible implementation, the water-cooled heat flux meter probe further includes: a heat shield made of a poor heat conductor material and arranged outside the fins;

[0023] A heat shield pull rod is arranged on the heat shield; the heat shield pull rod passes through a sliding hole at the end of the heat shield, and the position movement of the heat shield pull rod can drive the heat shield to slide along the fins to adjust the area of the fins exposed to heat.

[0024] In a possible implementation, the water-cooled heat flux meter probe further includes: a cooling end thermocouple arranged on the end face of the first end of the heat conduction rod; the output end of the water-cooled heat flux meter probe further includes the output end of the cooling end thermocouple.

[0025] In a possible implementation, a handle is installed on the top of the box body, and / or rollers are installed on the bottom surface of the box body.

[0026] The second aspect of the present application provides a self-calibrating dual-probe compensated heat transfer coefficient measurement method, which is applied to a controller in the self-calibrating dual-probe compensated heat transfer coefficient measurement device as described in the first aspect or any implementation manner of the first aspect. The method includes:

[0027] In the test stage, when the second end of the first heat flux meter probe is inserted into the material to be measured and the temperature of the second end face reaches a preset temperature, according to the pre-established corresponding relationship curve between the temperature gradient of the first heat flux meter probe and the heat flux value of the first heat flux meter probe, the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe is obtained, and the heat transfer coefficient is calculated based on the obtained heat flux value and output through the human-computer interaction device; the curve is generated in the calibration stage by making the first ends of the dual probes in the same cold environment through the cooling system, and making the second ends of the dual probes in a synchronously dynamically changing heat field through the power regulator and the electric heating device, and when the similarity of the temperature gradient change curves of the dual probes exceeds a preset value.

[0028] In a possible implementation, the method further includes: when it is detected that the similarity of the temperature gradient change curves of the dual probes exceeds a preset value, an indication signal of passing the verification is output through the human-computer interaction device;

[0029] When the similarity of the temperature gradient change curves of the dual probes is detected to be no more than the preset value, an indication signal of failed calibration is output through the human-computer interaction device.

[0030] With the above technical solution, the test work of this application is started on the premise that the second end of the first heat flux meter probe is inserted into the material to be measured, and the temperature of the end face of the second end of the first heat flux meter probe is adjusted to be close to the temperature of the working medium in the heating surface of the CFB boiler to highly simulate the actual working conditions. During the test, the controller obtains the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe according to the pre-established temperature gradient-heat flux value correspondence curve of the first heat flux meter probe, and then calculates the heat transfer coefficient. This test system adopts a self-calibration mechanism: two heat flux meter probes with the same structure and in the same environmental conditions perform temperature gradient measurements synchronously. If there is almost no difference in the temperature gradient change curves of the two, the controller can determine that the two heat flux meter probes are fault-free, and the foregoing correspondence curve is drawn after confirming that the heat flux meter probes are fault-free, so the accuracy of the final test result is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In combination with the accompanying drawings and with reference to the following specific embodiments, the above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and the original parts and elements are not necessarily drawn to scale.

[0032] Figure 1 Schematic structural diagram of a self-calibrating dual-probe compensated heat transfer coefficient measuring device provided by this application;

[0033] Figure 2 Graph of the temperature gradient-heat flux value correspondence of a first heat flux meter probe provided by this application;

[0034] Figure 3 Longitudinal sectional view of an electric heating device when the annular heat insulation cover is placed horizontally, provided by this application;

[0035] Figure 4 Top view of an electric heating device when the annular heat insulation cover is placed vertically, provided by this application;

[0036] Figure 5 Schematic structural diagram of a water-cooled heat flux meter probe provided by this application;

[0037] Figure 6 Schematic connection diagram of heat flux meter probes during the calibration stage of a self-calibrating dual-probe compensated heat transfer coefficient measuring device provided by this application;

[0038] Figure 7A schematic diagram of the connection of a heat flow meter probe during the test phase of a self-calibrated dual-probe compensation heat transfer coefficient measurement device provided by the present application;

[0039] Figure 8 A flow chart of a self-calibrated dual-probe compensation heat transfer coefficient measurement method provided in this application.

[0040] Reference numerals:

[0041] 1-handle; 2-box; 3-controller; 4-touch screen; 5-cooling water outlet pipe; 6-cooling water inlet pipe; 7-roller; 81-first regulating valve; 82-second regulating valve; 91-first heat flux meter probe; 92-second heat flux meter probe; 10-power regulator; 11-electric heating equipment; 12-button; 21-test end thermocouple; 22-test end; 23-insulating sleeve; 24-thermal conductive rod; 25-probe cooling water outlet; 26-fin; 27-cooling cover; 28-cooling end thermocouple; 29-probe cooling water inlet; 30-thermocouple array; 31-heat shield; 32-heat shield pull rod; 33-slide hole; 41-annular heat shield; 42-electrode; 43-end plate; 44-electric heating plate; 45-first groove; 46-second groove; 100-material to be tested; 101-material temperature measuring instrument. DETAILED DESCRIPTION

[0042] As a clean combustion technology, CFB (Circulating Fluidized Bed) occupies an important position in the field of thermal power generation due to its advantages of high combustion efficiency, low pollutant emissions, strong variable load capacity and wide fuel adaptability. During the operation of the CFB boiler, the high-temperature material in the furnace contacts the water-cooled wall, transferring the heat generated by the fuel combustion to the working fluid in the water-cooled wall, thereby realizing heat energy conversion.

[0043] With the large-scale grid connection of intermittent renewable energy sources such as solar energy and wind energy, grid regulation faces severe challenges. In order to balance the power fluctuations of renewable energy, the grid needs to increase the load regulation range of thermal power generation to reduce peak loads and fill valleys, creating conditions for the stable grid connection of renewable energy. CFB boilers are the main units of thermal power generation. With their wide load regulation range, they naturally become the first choice for realizing flexible peak regulation of the grid.

[0044] However, when the CFB boiler is operated under variable load, the material concentration in the furnace will be adjusted dynamically, which will cause the heat transfer coefficient to change. The heat transfer coefficient is an important indicator to measure the efficiency of heat transfer. Understanding and mastering its dynamic change law is crucial to understanding the dynamic characteristics of CFB boiler output.

[0045] For example, the heat reserve near-zero output technology of CFB thermal power units means that when there is an abundance of renewable energy power, the CFB boiler temporarily stops operating. At this time, the primary and secondary fans, induced draft fans, and high-pressure fluidization fans are shut down or maintained at an extremely low operating condition, all fuel feeding stops, and only the heat storage of the CFB boiler is used to heat the feed water and supply the steam turbine. During the process of the CFB boiler gradually reducing the load until it stops operating (banking the fire), and gradually increasing from near-zero load to the rated load (lighting the fire), the heat transfer coefficient experiences a significant change from large to small and then from small to large. This change greatly affects the dynamic characteristics of the CFB boiler output. Understanding and mastering the dynamic change law of the heat transfer coefficient is of great significance for optimizing the operation of the CFB boiler and improving energy utilization efficiency.

[0046] In order to deeply explore the heat transfer characteristics of the CFB boiler, it is necessary to consider the three basic heat transfer methods of conduction, convection, and radiation. At the same time, factors such as fluidization velocity, material concentration, and material particle size distribution also have an important impact on the heat transfer characteristics of the boiler heating surface. The complex relationship between these factors makes it difficult to accurately characterize the change of the heat transfer coefficient with a single mathematical model. Therefore, it is necessary to develop a self-calibrating dual-probe compensated heat transfer coefficient measuring device to accurately measure the change of the CFB boiler heat transfer coefficient with the load, so as to provide guidance at the data level for the operation during variable load operation.

[0047] Next, in combination with the accompanying drawings, a self-calibrating dual-probe compensated heat transfer coefficient measuring device provided by an embodiment of the present application will be described. Those of ordinary skill in the art can know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0048] The terms "first", "second", etc. in the description and claims of the present application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing the embodiments of the present application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product, or device including a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products, or devices.

[0049] See Figure 1 , a self-calibrating dual-probe compensated heat transfer coefficient measuring device provided by an embodiment of the present application, includes: a box body 2, a controller 3 and a power regulator 10 located inside the box body 2, and a cooling system, an electric heating device 11, a human-computer interaction device, and a dual probe located outside the box body 2;

[0050] The two probes are respectively a first heat flux meter probe 91 and a second heat flux meter probe 92; the first heat flux meter probe 91 and the second heat flux meter probe 92 have the same structure;

[0051] A heat flux meter probe is a sensor specifically designed to measure temperature gradients; specifically, the first end of the sensor is cooled by a cooling system to maintain a relatively stable low temperature state; the second end of the sensor is used to penetrate into the heat field environment; since the two ends of the sensor are in different temperature states, a temperature gradient is formed inside the sensor, and the temperature measuring elements (such as thermocouples, etc.) distributed on the sensor are used to measure and output an electrical signal related to the temperature gradient, thereby realizing the measurement of the temperature gradient; the first end and the second end of the sensor can be respectively called the cooling end and the test end;

[0052] The power regulator 10, also known as a power conditioner or voltage regulator, is a power adjustment unit that adjusts the load power according to the received control signal; in the embodiment of the present application, the input end of the power regulator 10 is connected to a power source (such as a 220V AC power source) through a power cable, the output end of the power regulator 10 is electrically connected to the input end of the electric heating device 11, and the control end of the power regulator 10 is connected to the controller 3; the power regulator 10 adjusts its own output power according to the control signal issued by the controller 3, thereby controlling the heating power of the electric heating device 11;

[0053] The controller 3 is also electrically connected to the output end of the first heat flux meter probe 91, the output end of the second heat flux meter probe 92, and the input and output ends of the human-computer interaction device;

[0054] The human-computer interaction device is used for the user to input instructions, view measurement data, trigger corresponding operations, etc.; the human-computer interaction device can be set on the front wall of the box body 2 (i.e., the front side of the outer wall of the box body 2) for the convenience of user operation and observation;

[0055] The controller 3 is used in the test stage. When the second end of the first heat flux meter probe 91 is inserted into the material to be tested and the temperature of the end face of the second end reaches the preset temperature, according to the pre-established corresponding relationship curve between the temperature gradient of the first heat flux meter probe 91 and the heat flux value of the first heat flux meter probe 91, the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe 91 is obtained, and the heat transfer coefficient is calculated according to the obtained heat flux value and output through the human-computer interaction device; the curve is generated in the calibration stage. By making the first ends of the two probes in the same cold environment through the cooling system, and making the second ends of the two probes in a synchronously dynamically changing heat field through the power regulator 10 and the electric heating device 11, when the similarity of the temperature gradient change curves of the two probes exceeds the preset value.

[0056] More specifically, the controller 3 is configured to, in a preset test environment, in response to a test instruction issued by the human-machine interaction device, obtain the current temperature gradient of the first heat flux meter probe 91, and according to a pre-generated corresponding relationship curve between the temperature gradient of the first heat flux meter probe 91 and the heat flux value of the first heat flux meter probe 91, obtain the heat flux value corresponding to the current temperature gradient, calculate the heat transfer coefficient of the CFB boiler based on the obtained heat flux value, and output the heat transfer coefficient through the human-machine interaction device;

[0057] Among them, the test environment is preset as follows: the second end of the first heat flux meter probe 91 is inserted into the material to be tested (the material to be tested is a flowing high-temperature material), and the temperature of the end face of the second end of the first heat flux meter probe 91 reaches a preset temperature;

[0058] The corresponding relationship curve is a curve generated by the controller 3 in a preset calibration environment, controlling the power regulator 10 to adjust the heating power of the electric heating device 11 according to a preset power gradient, obtaining the temperature gradient of the double probes during the current power adjustment process, and generating the curve when the similarity of the temperature gradient change curves of the double probes exceeds a preset value;

[0059] The calibration environment is preset as follows: the first ends of the double probes are placed under the same cooling conditions through the cooling system, and the second ends of the double probes are placed in two regions with the same heat release conditions of the electric heating device 11, so as to ensure that the double probes are in the same environmental conditions and are used as references for each other.

[0060] The user can accurately measure the heat transfer coefficient only by operating in three stages by using the above self-calibrating double-probe compensation type heat transfer coefficient measuring device. The specific description is as follows:

[0061] Stage 1: Preparation stage

[0062] The user provides the same cooling conditions for the first end of the first heat flux meter probe 91 and the first end of the second heat flux meter probe 92 through the cooling system, so that the first ends of the two probes reach substantially the same cooled temperature.

[0063] In a possible implementation, still referring to Figure 1, both the first heat flux probe 91 and the second heat flux probe 92 are water-cooled heat flux probes. Correspondingly, the cooling system includes: the water-cooling systems of the first heat flux probe 91 and the second heat flux probe 92 themselves, and the cooling water outlet pipe 5 and the cooling water inlet pipe 6 located on the outer wall of the box body 2; the cooling water outlet pipe 5 is connected to the probe cooling water outlet 25 of the water-cooling systems of the first heat flux probe 91 and the second heat flux probe 92 through pipelines; the cooling water inlet pipe 6 is connected to the probe cooling water inlet 29 of the water-cooling systems of the first heat flux probe 91 and the second heat flux probe 92 through pipelines; a first regulating valve 81 is installed at the probe cooling water inlet 29 of the first heat flux probe 91, and a second regulating valve 82 is installed at the probe cooling water inlet 29 of the second heat flux probe 92. At this time, this preparation stage is specifically as follows: the user connects the cooling water inlet pipe 6 to the cooling water and connects the cooling water outlet pipe 5 to the drainage facility; then, the user adjusts the opening degrees of the first regulating valve 81 and the second regulating valve 82 to ensure that the cooling water can smoothly flow into the water-cooling systems of the first heat flux probe 91 and the second heat flux probe 92 at a preset flow rate, continuously cool the first ends of the first heat flux probe 91 and the second heat flux probe 92, and thus reach basically the same post-cooling temperature.

[0064] Phase 2: Calibration Phase

[0065] After the preparation stage is completed, the user simultaneously exposes the second ends of the first heat flux probe 91 and the second heat flux probe 92 to two areas with the same heat release conditions of the electric heating device 11, thereby completing the establishment of the calibration environment.

[0066] In a calibration environment, the user powers on the self-calibrating dual-probe compensated heat transfer coefficient measuring device to supply power to the power regulator 10. The controller 3 adjusts the output power of the power regulator 10, thereby adjusting the heating power of the electric heating device 11 to achieve the purpose of releasing different heat fluxes by the electric heating device 11. The second ends of the first heat flux meter probe 91 and the second heat flux meter probe 92 start to receive heat fluxes. The controller 3 obtains the temperature gradient of the first heat flux meter probe 91. After the temperature gradient is stable, the temperature gradient of the first heat flux meter probe 91 and the corresponding heat flux value are recorded (there is a fixed positive correlation between the heat flux value of the first heat flux meter probe 91 and the heat flux released by the electric heating device 11. Therefore, there is a fixed positive correlation between the heat flux value of the first heat flux meter probe 91 and the output power of the power regulator 10. The controller 3 can calculate the heat flux value of the first heat flux meter probe 91 based on the output power of the first heat flux meter probe 91). At the same time, the controller 3 obtains the temperature gradient of the second heat flux meter probe 92. After the temperature gradient is stable, the temperature gradient of the second heat flux meter probe 92 is recorded. Then, the controller 3 changes (usually at least 3 times) the output power of the power regulator 10 multiple times. After each change, the temperature gradient of the first heat flux meter probe 91 and the corresponding heat flux value and the temperature gradient of the second heat flux meter probe 92 are recorded again.

[0067] Since the structures of the two heat flux meter probes are the same, and the first ends of the two heat flux meter probes have the same cooling conditions, and the second ends of the two heat flux meter probes are simultaneously exposed to two regions with the same heat release conditions of the electric heating device 11. Therefore, in the calibration stage, if both heat flux meter probes are in a fault-free state, theoretically the heat fluxes received by both should be approximately equal, and the temperature gradients of both should always be basically the same. Based on this premise, the controller 3 can verify whether there is a measurement deviation in the first heat flux meter probe 91 by comparing whether the temperature gradient of the second heat flux meter probe 92 is always close to or equal to the temperature gradient of the first heat flux meter probe 91 (that is, the controller 3 detects whether the similarity of the temperature gradient change curves of the second heat flux meter probe 92 and the first heat flux meter probe 91 exceeds a preset value).

[0068] If it is verified that the temperature gradient of the second heat flux meter probe 92 is always close to or equal to the temperature gradient of the first heat flux meter probe 91, the controller 3 can determine that the calibration is passed and there is no measurement deviation in the first heat flux meter probe 91 (of course, there must be no measurement deviation in the second heat flux meter probe 92 at this time). Then, based on the pre-recorded data, the controller 3 draws a curve graph of the temperature gradient - heat flux value correspondence relationship of the first heat flux meter probe 91, such as Figure 2 shown.

[0069] If, upon inspection, the temperature gradient of the second heat flux meter probe 92 differs significantly from that of the first heat flux meter probe 91, the controller 3 can determine that there is a measurement deviation in at least one heat flux meter probe. This deviation may be caused by damage, contamination, or other factors of the heat flux meter probe. Subsequently, the user can debug and calibrate the heat flux meter probe with deviation, and after the calibration is completed, perform the above verification work again until the verification passes.

[0070] Phase 3: Testing Phase

[0071] After the verification passes, the user inserts the second end of the first heat flux meter probe 91 into the material to be measured. Then, the user adjusts the cooling system (for example, by adjusting the opening degree of the first regulating valve 81) to make the temperature of the second end face of the first heat flux meter probe 91 (hereinafter referred to as the test end face) basically reach the temperature of the working medium in the heating surface of the CFB boiler, so as to ensure that the heat flux test conditions can truly reflect the actual working scenario of the heating surface of the CFB boiler, thereby completing the establishment of the test environment. In a possible implementation, the first heat flux meter probe 91 can directly feedback the temperature of the test end face to the controller 3, and the controller 3 controls the human-machine interaction device to output this temperature for the user to observe.

[0072] Under the test environment, the controller 3 queries the corresponding relationship curve graph drawn in Phase 2 according to the temperature gradient measured by the first heat flux meter probe 91, and thus obtains the heat flux currently flowing through the first heat flux meter probe 91. And the controller 3 obtains the temperature of the material to be measured measured by the material temperature measuring instrument. Finally, the controller 3 calculates the heat transfer coefficient according to the formula h = Q / A / (Tw - Tb); where, h is the heat transfer coefficient, W / (m 2 ℃); Q is the heat flux, W; A is the surface area of the test end face, m 2 ; Tw is the temperature of the test end face, ℃; Tb is the temperature of the material to be measured, ℃.

[0073] In summary, the test work of the embodiment of the present application is started on the premise that the second end of the first heat flux meter probe 91 is inserted into the material to be measured, and the end face temperature of the second end of the first heat flux meter probe 91 is adjusted to be close to the working medium temperature in the heating surface of the CFB boiler to highly simulate the actual working conditions. During the test, the controller 3 obtains the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe 91 according to the pre-established temperature gradient-heat flux value corresponding relationship curve of the first heat flux meter probe 91, and then calculates the heat transfer coefficient. This test system adopts a self-checking mechanism: two heat flux meter probes with the same structure and in the same environmental conditions measure the temperature gradient synchronously. If there is almost no difference in the temperature gradient change curves recorded by the two, the controller 3 can determine that there is no fault in the two heat flux meter probes. And the aforementioned corresponding relationship curve is drawn after confirming that the heat flux meter probe has no fault, so the accuracy of the final test result is ensured. The embodiment of the present application integrates the double probe with the controller 3 and the electric heating device 11 to realize the calibration of the temperature gradient-heat flux value corresponding relationship curve of the heat flux meter probe, which is convenient to use and has reliable performance.

[0074] It should be noted that the temperature gradient-heat flux value corresponding relationship curve of the first heat flux meter probe 91 can be pre-drawn by the manufacturer before the product leaves the factory and stored in the memory of the product for subsequent direct use by users. However, considering that hardware parameter changes (such as changes in the heat transfer performance of the first heat flux meter probe 91) are inevitable during the long-term use of the product, resulting in the deviation of the stored corresponding relationship curve from the actual situation, users can, as appropriate, re-draw the corresponding relationship curve under the required calibration environment before the test to ensure that the final test result is always accurate. During the calibration stage, when the controller 3 detects that the temperature gradient change curves of the double probe are highly similar, it can output an indication signal of passing the calibration through the man-machine interaction device to indicate that the user's calibration has passed. At this time, the user can start to establish the test environment and carry out the test work. When the similarity of the temperature gradient change curves of the double probe detected does not exceed the preset value, an indication signal of failing the calibration can be output through the man-machine interaction device, and at this time, the user can carry out the calibration work.

[0075] The embodiment of the present application can be used to study the heat transfer characteristics of the CFB boiler at near-zero output, the heat transfer characteristics during rapid load increase and decrease, and the relationship between heat transfer and load during steady-state operation, directly obtain the heat transfer coefficient, and be used to measure the change law of the heat transfer coefficient with the load on the CFB boiler, and directly provide guidance at the data level for the operation control during variable load operation.

[0076] In a possible implementation, still referring to Figure 1, the human - machine interaction device in any of the self - calibrating dual - probe compensated heat transfer coefficient testing devices provided above includes: a touch screen 4 and buttons 12. Users can input instructions, view measurement data, etc. through the touch screen 4. Using the touch screen as the human - machine interface, the interface is user - friendly and easy to operate; the buttons 12 can be used to trigger testing or calibration operations.

[0077] In a possible implementation, still referring to Figure 1 , the controller 3 in any of the self - calibrating dual - probe compensated heat transfer coefficient testing devices provided above is a PLC (Programmable Logic Controller). The PLC has many advantages such as high reliability and stability, powerful control capabilities, easy programming and maintenance, comprehensive communication protocol support, a wide range of application fields, and high cost - effectiveness. These advantages make the PLC an indispensable part of the industrial automation field.

[0078] In a possible implementation, still referring to Figure 1 , a handle 1 is installed on the top of the box body 2 in any of the self - calibrating dual - probe compensated heat transfer coefficient testing devices provided above. The handle is designed such that users can easily lift and move the box body 2 without additional handling tools; when it is necessary to move the box body 2 short distances or adjust its position, the handle 1 provides a convenient grasping point, reducing the inconvenience during handling.

[0079] In a possible implementation, still referring to Figure 1 , rollers 7 are installed on the bottom surface of the box body 2 in any of the self - calibrating dual - probe compensated heat transfer coefficient testing devices provided above. The rollers 7 enable the box body 2 to slide easily on the ground, greatly improving the moving efficiency and significantly reducing the labor consumption.

[0080] In a possible implementation, referring to Figure 3 and Figure 4 , the electric heating device 11 in any of the self - calibrating dual - probe compensated heat transfer coefficient testing devices provided above includes: an annular heat insulation cover 41, electrodes 42, an electric heating plate 44, and two end plates 43; the annular heat insulation cover 41 and the two end plates 43 enclose a closed chamber, and the electric heating plate 44 is placed in the closed chamber; the electric heating plate 44 is electrically connected to the electrodes 42; the electrodes 42 are the input ends of the electric heating device 11. In this embodiment, the electrodes 42, as the electrical connection part, receive the electric energy output by the power regulator 10 and transfer it to the electric heating plate 44. The electric energy heats the electric heating plate 44, realizing overall electric - heat conversion and temperature control; at the same time, the electric heating device 11 maintains the heating efficiency and temperature stability through the closed chamber formed by the annular heat insulation cover 41 and the two end plates 43. Figure 3 is the longitudinal sectional view of the electric heating device 11 when the annular heat insulation cover 41 is placed horizontally; Figure 4It is a top view of the electric heating device 11 when the annular heat shield 41 is vertically placed.

[0081] In a possible implementation, still referring to Figure 3 and Figure 4 , the annular heat shield 41 and one of the end plates 43 enclose a first groove 45, and the annular heat shield 41 and the other end plate 43 enclose a second groove 46; the second end of the first heat flux meter probe 91 is designed with a shape and size adapted to the first groove 45 so as to be able to be tightly inserted into the first groove 45; the second end of the second heat flux meter probe 92 is designed with a shape and size adapted to the second groove 46 so as to be able to be tightly inserted into the second groove 46. In the calibration stage of this embodiment, the user inserts the second ends of the first heat flux meter probe 91 and the second heat flux meter probe 92 into the first groove 45 and the second groove 46 respectively. Due to the presence of the annular heat shield 41, almost all the heat released by the electric heating device 11 enters the two heat flux meter probes. The heat flux Q released by the electric heating plate 44 is evenly transmitted to the first heat flux meter probe 91 and the second heat flux meter probe 92 through the end plate 43, and the heat flux received by each heat flux meter probe is Q / 2.

[0082] In a possible implementation, referring to Figure 5 , the water-cooled heat flux meter probe in any of the self-calibrating dual-probe compensated heat transfer coefficient testing devices provided above includes: a heat conducting rod 24, a cooling housing 27 and heat insulation;

[0083] A fin 26 is provided at the first end of the heat conducting rod 24, and the fin 26 is placed inside the cooling housing 27. A probe cooling water outlet 25 and a probe cooling water inlet 29 are provided on the housing of the cooling housing 27;

[0084] The heat conducting rod 24 is placed inside the heat insulation sleeve 23. The second end of the heat conducting rod 24 is a test end face 22, and a test end face thermocouple 21 is arranged on the test end face 22; a thermocouple array 30 is arranged along the axial direction on the outer surface of the heat conducting rod 24, and the thermocouple array 30 includes a plurality of (usually at least 3) thermocouples arranged along the axis direction of the heat conducting rod 24;

[0085] The output ends of the test end face thermocouple 21 and the thermocouple array 30 together constitute the output end of the water-cooled heat flux meter probe; the controller 3 calculates the temperature gradient of the water-cooled heat flux meter probe according to the temperature measured by the thermocouple array 30;

[0086] The first end and the second end of the heat conducting rod 24 are respectively the first end and the second end of the water-cooled heat flux meter probe.

[0087] In a possible implementation, the heat insulation sleeve 23 can be made of a high-temperature resistant thermal insulation material, nanoporous silica adiabatic material, with a thermal conductivity of about 0.03 W / (m K). The heat insulation sleeve 23 is made of a material with low thermal conductivity to limit radial heat conduction, thereby approximately forming one-dimensional heat conduction on the heat conduction rod 24.

[0088] In a possible implementation, still referring to Figure 5 , the above-mentioned water-cooled heat flux meter probe further includes: a heat shield 31 made of a poor heat conductor material and disposed outside the fin 26; a heat shield pull rod 32 is provided on the heat shield 31; the heat shield pull rod 32 passes through a sliding hole 33 at the end of the heat shield 31, and the position movement of the heat shield pull rod 32 can drive the heat shield 31 to slide along the fin 26 to adjust the area of the fin 26 exposed to heat.

[0089] Among them, the heat shield 31, as a thermal insulator, is characterized by a small thermal conductivity and poor heat conduction performance, and can effectively isolate heat transfer. To enhance the flexibility of this design, a heat shield pull rod 32 is specially equipped on the heat shield 31. The heat shield pull rod 32 passes through the sliding hole 33 at the end of the heat shield 31, so that the position of the heat shield 31 can be adjusted by sliding according to requirements. This design mechanism allows users to adjust the area of the fin 26 exposed to heat according to needs, thereby realizing the adjustability of the coverage rate of the fin 26. Increasing the coverage rate can reduce the heat exchange between the fin 26 and the surrounding environment, thereby reducing the temperature drop rate of the test end face 22; conversely, reducing the coverage rate accelerates heat exchange and increases the temperature drop rate.

[0090] By adjusting the position of the heat shield 31, not only can the contact area between the fin 26 and heat be flexibly controlled, but also combined with the adjustment of the cooling water flow rate (by adjusting the flow rate of the cooling water, the cooling rate of the test end face 22 can be precisely controlled, and then its temperature can be adjusted), a more flexible cooling strategy can be formed. Compared with the single cooling method that only relies on the adjustment of the cooling water flow rate, this design that combines water cooling and enhanced heat dissipation of the fin 26 significantly improves the time dynamic response speed of the system to reach steady-state heat transfer, making the water-cooled heat flux meter probe show better performance in terms of response time and cooling efficiency. Therefore, the main function of the heat shield 31 is to provide an additional control dimension for the cooling effect by adjusting the area of the fin 26 participating in cooling, enhancing the flexibility and efficiency of the overall design.

[0091] A silicone gasket can be used for sealing between the heat shield pull rod 32 and the sliding hole 33. This material not only has good elasticity but also can maintain stable sealing performance at high temperatures, effectively preventing the leakage of cooling water. This sealing measure ensures the tight connection between the heat shield 31 and the cooling housing 27, avoids the accidental outflow of cooling water, and guarantees the accuracy and safety of the test.

[0092] The heat shield 31 needs to have good heat insulation and high temperature resistance properties, which can significantly reduce the heat transfer from the test end face 22 to the surrounding environment, thus more accurately simulating the actual working conditions of the heated surface. PTFE (polytetrafluoroethylene) becomes an ideal choice for the heat shield 31 due to its extremely low thermal conductivity (its thermal conductivity is about 0.22 W / (m·K)) and excellent high temperature resistance characteristics.

[0093] In a possible implementation, still referring to Figure 5 , the water-cooled heat flux meter probe further includes: a cooling end thermocouple 28 arranged on the end face of the first end of the heat conducting rod 24, and the output end of the water-cooled heat flux meter probe further includes the output end of the cooling end thermocouple 28. The main responsibility of the cooling end thermocouple 28 is to monitor the temperature of the first end of the heat conducting rod 24 in real time, ensuring that the temperature of the first end of the heat conducting rod 24 does not become too high, thereby preventing the cooling water from evaporating due to high temperature. Evaporation will not only lead to the deterioration of the local heat transfer effect, but also may bring potential safety hazards due to the sudden increase in pressure caused by the phase change. Therefore, the monitoring function of the cooling end thermocouple 28 is crucial for ensuring the safe operation of the entire water-cooled heat conducting device. In a possible implementation, the cooling end thermocouple 28 can directly feedback the measured temperature to the controller 3, and the controller 3 controls the human-computer interaction device to output this temperature for the user to observe.

[0094] The specific operation for the user to measure the heat transfer coefficient based on Figure 1 , Figures 3 - 5 can be carried out in the following three stages:

[0095] Stage 1: Preparation stage

[0096] The user connects the cooling water inlet pipe 6 to the cooling water, and the cooling water outlet pipe 5 to the drainage facility; then, adjusts the opening degrees of the first regulating valve 81 and the second regulating valve 82 to ensure that the cooling water can smoothly flow into the cooling housing 27 of the first heat flux meter probe 91 and the second heat flux meter probe 92 at a preset flow rate; and the user adjusts the position of the heat shield 31 so that a part of the fins 26 is exposed, enabling the cooling water to wash the exposed fins 26 and continuously cool one end of the heat conducting rod 24, thereby achieving basically the same cooled temperature.

[0097] Stage 2: Calibration stage

[0098] After the preparation stage is completed, the user inserts the second ends of the first heat flux meter probe 91 and the second heat flux meter probe 92 into the first groove 45 and the second groove 46 respectively (refer to Figure 6 ), thus completing the establishment of the calibration environment. The heat flux Q released by the electric heating plate 44 is evenly transmitted to the first heat flux meter probe 91 and the second heat flux meter probe 92 through the end plate 43, and the heat flux transmitted by each heat flux meter probe is Q / 2. Next, the user can carry out the corresponding work in the established calibration environment.

[0099] III. Testing Phase

[0100] After passing the calibration, the user inserts the first heat flux probe 91 into the material 100 to be measured (see Figure 7 ). Then, the user adjusts the opening degree of the first regulating valve 81 and the position of the heat shield 31 of the first heat flux probe 91 until the temperature indication of the thermocouple 21 at the test end face of the first heat flux probe 91 reaches the preset temperature, thus completing the establishment of the test environment. Next, the user carries out corresponding work in the established test environment to obtain the current heat flux value of the first heat flux probe 91 (i.e., the value of the heat flux flowing through the heat conducting rod 24 of the first heat flux probe 91), and then calculates the heat transfer coefficient based on the current heat flux value, the temperature gradient measured by the thermocouple array 30 of the first heat flux probe 91, the surface area of the test end face 22 of the first heat flux probe 91, the temperature of the thermocouple 21 at the test end face of the first heat flux probe 91, and the temperature of the material 100 to be measured measured by the material temperature measuring instrument 101.

[0101] In a specific test scenario, for a CFB boiler with an evaporation capacity of 1065 t / h and an operating pressure of 17.5 MPa, the temperature of the medium inside the evaporation heating surface corresponding to it is 355 °C. The heat transfer coefficient of the water-cooled wall in the dense phase region is measured. The heat conducting rod 24 is inserted into the dense phase region through the opening of the water-cooled wall and is in full contact with the material 100 to be measured. The temperature of the fluid to be measured is 900 °C. Aluminum is used as the material of the heat conducting rod 24. The diameter of the heat conducting rod 24 is 8 cm, the rib pitch is 5 mm, the rib height is 5 cm, and the total heat dissipation area of the fin 26 is about 0.8 m2. The cooling water flow rate is adjusted, and the heat transfer coefficient of the cooling water to the fin 26 is about 100 W / (m2 °C); the heat shield pull rod 32 is adjusted to change the effective heat dissipation area of the fin 26. Under the test heat flux condition, the temperature of the test end face 22 is 350 °C, which is close to the water temperature of 355 °C inside the water-cooled wall tube within the error range. After waiting for the temperature gradient of the heat conducting rod 24 to stabilize, the measured temperature gradient at this time is 346 °C / m. According to the temperature gradient at this time, query Figure 2 the corresponding relationship diagram shown, and the heat flux at this time is obtained as 420 W. According to the temperature difference and the area of the test end face 22, the calculated heat transfer coefficient is 153 W / (m2 °C).

[0102] Among them, the heat conducting rod 24 is used as the sensing element of the heat flux, and the magnitude of the heat flux is determined by its temperature gradient. In practical applications, the material of the heat conducting rod 24 needs to be selected according to the specific heat flux scenario: in a high heat flux scenario (i.e., a scenario with a high demand for heat conduction), in order to effectively conduct a large amount of heat, a material with a high thermal conductivity can be selected; in a low heat flux scenario (i.e., a scenario with a relatively low demand for heat conduction), a material with a relatively low thermal conductivity can be selected to reduce costs or meet other specific requirements.

[0103] In addition, in order to adapt to the heat transfer coefficients of different walls and the temperature conditions of different test end faces, the material selection of the heat conduction rod 24 should be flexible and diverse. Table 1 is a reference table for material selection, listing the working temperatures and thermal conductivities of several common materials, and the materials used for the heat conduction rod 24 can be selected from Table 1.

[0104] Table 1 - Reference Table for Material Selection

[0105]

[0106] Corresponding to the above device embodiments, an embodiment of the present application also provides a self-calibrating dual-probe compensated heat transfer coefficient measurement method, which is applied to the controller in any of the above self-calibrating dual-probe compensated heat transfer coefficient measurement devices. The method includes: in the test stage, when the second end of the first heat flux meter probe is inserted into the material to be measured and the temperature of the second end face reaches the preset temperature, according to the pre-established corresponding relationship curve between the temperature gradient of the first heat flux meter probe and the heat flux value of the first heat flux meter probe, obtain the heat flux value corresponding to the current temperature gradient of the first heat flux meter probe, calculate the heat transfer coefficient according to the obtained heat flux value, and output it through the human-computer interaction device; the curve is generated in the calibration stage by making the first ends of the dual probes in the same cold environment through the cooling system, and making the second ends of the dual probes in a synchronously dynamically changing thermal field through the power regulator and the electric heating device, and when the similarity of the temperature gradient change curves of the dual probes is detected to exceed the preset value.

[0107] More specifically, as Figure 8 shown, the method includes:

[0108] Step S01: In a preset test environment, in response to a test instruction issued by the human-computer interaction device, obtain the current temperature gradient of the first heat flux meter probe;

[0109] Step S02: According to the pre-generated corresponding relationship curve between the temperature gradient of the first heat flux meter probe and the heat flux value of the first heat flux meter probe, obtain the heat flux value corresponding to the current temperature gradient;

[0110] Step S03: Calculate the heat transfer coefficient of the circulating fluidized bed according to the obtained heat flux value, and output the heat transfer coefficient through the human-computer interaction device.

[0111] Among them, the test environment is preset as: the second end of the first heat flux meter probe is inserted into the material to be measured, and the temperature of the second end face of the first heat flux meter probe reaches the preset temperature;

[0112] The corresponding relationship curve is a curve generated by the controller when, in a preset calibration environment, controlling the power regulator to adjust the heating power of the electric heating device according to a preset power gradient, obtaining the temperature gradient of the double probe and the heat flux value of the first heat flux meter probe during the current power adjustment process, and when the similarity of the temperature gradient change curve of the double probe is detected to exceed a preset value;

[0113] The preset calibration environment is: the first ends of the double probes are placed under the same cooling conditions through a cooling system, and the second ends of the double probes are placed in two regions with the same heat release conditions of the electric heating device.

[0114] In a possible implementation, the method further includes: when the similarity of the temperature gradient change curve of the double probe is detected to exceed a preset value, outputting an indication signal of passing the verification through a human-machine interaction device;

[0115] When the similarity of the temperature gradient change curve of the double probe is detected not to exceed the preset value, outputting an indication signal of failing to pass the verification through a human-machine interaction device.

[0116] For the method disclosed in the embodiment, since it corresponds to the device disclosed in the embodiment, the description is relatively simple. For related parts, refer to the description of the device part, and details will not be repeated here.

[0117] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the embodiments of the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-calibrated dual-probe compensation heat transfer coefficient measuring device, characterized in that: include: Box (2); A controller (3) and a power regulator (10) located inside the housing (2); A cooling system, an electric heating device (11), a human-machine interaction device and dual probes located outside the box (2); the dual probes are a first heat flow meter probe (91) and a second heat flow meter probe (92) having the same structure; The output end of the power regulator (10) is electrically connected to the input end of the electric heating device (11); The controller (3) is electrically connected to the control end of the power regulator (10), the input and output ends of the human-machine interaction device, and the output end of the dual probe respectively; The controller (3) is used to obtain the heat flow value corresponding to the current temperature gradient of the first heat flow meter probe (91) according to a pre-established corresponding relationship curve between the temperature gradient of the first heat flow meter probe (91) and the heat flow value of the first heat flow meter probe (91) when the second end of the first heat flow meter probe (91) is inserted into the material to be tested and the temperature of the end surface of the second end reaches a preset temperature during the test phase, calculate the heat transfer coefficient according to the obtained heat flow value and output it through the human-computer interaction device; the curve is generated when it is detected that the similarity of the temperature gradient change curves of the dual probes exceeds a preset value during the calibration phase, when the first ends of the dual probes are placed in the same cold environment through the cooling system and the second ends of the dual probes are placed in a synchronously dynamically changing thermal field through the power regulator (10) and the electric heating device (11).

2. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 1, characterized in that: The electric heating device (11) comprises: an annular heat insulation cover (41), an electrode (42), an electric heating plate (44) and two end plates (43); the annular heat insulation cover (41) and the two end plates (43) form a closed chamber, and the electric heating plate (44) is placed in the closed chamber; the electric heating plate (44) is electrically connected to the electrode (42); and the electrode (42) is an input end of the electric heating device (11).

3. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 2, characterized in that: The annular heat shield (41) and one of the end plates (43) form a first groove (45) for inserting the second end of the first heat flow meter probe (91); the annular heat shield (41) and the other end plate (43) form a second groove (46) for inserting the second end of the second heat flow meter probe (92).

4. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 1, 2 or 3, characterized in that: The dual probes are both water-cooled heat flow meter probes; The cooling system comprises: a water cooling system of the dual probe itself, and a cooling water outlet pipe (5) and a cooling water inlet pipe (6) located on the outer wall of the housing (2); the cooling water outlet pipe (5) is connected to the probe cooling water outlet (25) of the dual probe water cooling system through a pipeline; the cooling water inlet pipe (6) is connected to the probe cooling water inlet (29) of the dual probe water cooling system through a pipeline; and regulating valves are installed at the probe cooling water inlets (29) of the dual probes.

5. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 4, characterized in that: The water-cooled heat flow meter probe comprises: a heat conducting rod (24), a cooling cover (27) and a heat insulating sleeve (23); The first end of the heat conducting rod (24) is provided with a fin (26), the fin (26) is placed in the cooling shell (27), and the shell of the cooling shell (27) is provided with the probe cooling water outlet (25) and the probe cooling water inlet (29); The heat conducting rod (24) is placed in the heat insulating sleeve (23), and a test end surface thermocouple (21) is arranged on the end surface of the second end of the heat conducting rod (24); A thermocouple array (30) is arranged along the axial direction on the outer surface of the heat-conducting rod (24), wherein the thermocouple array (30) comprises a plurality of thermocouples arranged along the axial direction of the heat-conducting rod (24); The output end of the water-cooled heat flow meter probe comprises the output end of the test end surface thermocouple (21) and the output end of the thermocouple array (30); The first end and the second end of the heat conducting rod (24) are respectively the first end and the second end of the water-cooled heat flow meter probe.

6. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 5, characterized in that: The water-cooled heat flow meter probe further comprises: a heat shield (31) arranged outside the fin (26) and made of a material that is a poor thermal conductor; A heat shield pull rod (32) is provided on the heat shield (31); the heat shield pull rod (32) passes through a sliding hole (33) at the end of the heat shield (31); movement of the heat shield pull rod (32) can drive the heat shield (31) to slide along the fin (26) to adjust the area of ​​the fin (26) exposed to heat.

7. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 5, characterized in that: The water-cooled heat flow meter probe further comprises: a cooling end thermocouple (28) arranged on the end surface of the first end of the heat conducting rod (24); the output end of the water-cooled heat flow meter probe further comprises the output end of the cooling end thermocouple (28).

8. The self-calibrated dual-probe compensation heat transfer coefficient measuring device according to claim 1, characterized in that: A handle (1) is installed on the top of the box body (2), and / or a roller (7) is installed on the bottom surface of the box body (2).

9. A self-calibrated dual-probe compensation heat transfer coefficient measurement method, characterized in that: A controller (3) used in a self-calibrated dual-probe compensation heat transfer coefficient measurement device according to any one of claims 1 to 8, the method comprising: In the test phase, when the second end of the first heat flow meter probe (91) is inserted into the material to be tested and the temperature of the end surface of the second end reaches a preset temperature, the heat flow value corresponding to the current temperature gradient of the first heat flow meter probe (91) is obtained based on a pre-established corresponding relationship curve between the temperature gradient of the first heat flow meter probe (91) and the heat flow value of the first heat flow meter probe (91), and the heat transfer coefficient is calculated based on the obtained heat flow value and output through a human-computer interaction device; the curve is generated when it is detected that the similarity of the temperature gradient change curves of the dual probes exceeds a preset value during the calibration phase, when the first ends of the dual probes are placed in the same cold environment through a cooling system and the second ends of the dual probes are placed in a synchronously dynamically changing thermal field through a power regulator (10) and an electric heating device (11).

10. The self-calibrated dual-probe compensation heat transfer coefficient measurement method according to claim 9, characterized in that: The method further comprises: when it is detected that the similarity of the temperature gradient change curves of the dual probes exceeds a preset value, outputting an indication signal indicating that the verification has passed through the human-computer interaction device; When it is detected that the similarity of the temperature gradient change curves of the dual probes does not exceed the preset value, an indication signal indicating that the verification has not passed is output through the human-computer interaction device.

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