Hearth flame temperature measuring method and device based on radiation heat exchange

Abstract

The invention discloses a hearth flame temperature measuring method and device based on radiation heat transfer, and the method comprises the steps: enabling a measuring device to extend into a boiler hearth, and enabling the area of a measuring probe of the measuring device to be known; measuring the temperature of inlet fluid, the temperature of outlet fluid, the specific heat capacity of cooling fluid and the mass flow rate of the fluid in the probe through fluid cooling; the measuring probe receives radiation heat of flame of the boiler furnace at the position, heat released by radiation heat exchange of high-temperature flue gas of the boiler furnace is taken away by cooling fluid in the measuring probe, and it is guaranteed that the temperature of the cooling fluid entering the measuring probe is not changed; the boiler furnace blackness, the Stefan-Boltzmann constant, the pollution coefficient and the total effective heating area of the boiler furnace are determined, the area of the measuring probe is combined, and the flame temperature of the boiler furnace at the position is obtained through the parameters of the measuring device. The problem that the measurement precision is affected by interference of media in the furnace is solved.

Description

Technical Field

[0001] The invention relates to the technical field of furnace flame temperature measurement, and in particular to a furnace flame temperature measurement method and device based on radiation heat exchange. Background Art

[0002] The safety and economic operation of power plant boilers have always been the focus of research in the power industry. However, due to the shortcomings of boiler temperature detection technology, boiler combustion safety hazards still exist. Advanced and effective flame temperature field measurement technology has important scientific significance and practical value for studying the safety of power plant boiler operation and combustion optimization control. The environment in the furnace is very harsh, and the combustion conditions of coal powder are also very complicated. The flame temperature burning in the furnace is not only related to the type, concentration, and fineness of coal powder, but also to factors such as boiler load, air volume, and excess air coefficient. The combustion temperature in the furnace exceeds 1000℃. In such a harsh and complex combustion environment in the furnace, traditional thermocouples represented by contact temperature measurement methods can no longer achieve accurate monitoring of boiler combustion temperature during production. Non-contact temperature measurement methods represented by infrared radiation temperature measurement methods, acoustic temperature measurement methods, and image temperature measurement methods will encounter fly ash and dust coking, which will cause blockage of non-contact temperature measurement devices, resulting in inaccurate temperature measurement, as well as blocking effects such as fly ash and unburned particles in the furnace, resulting in reduced measurement accuracy of infrared and acoustic waves.

[0003] Furnace temperature measurement technology is mainly divided into contact and non-contact types. Although contact temperature measurement methods such as thermocouples are simple in device, easy to maintain, and have high measurement accuracy, they have certain hysteresis and are easily damaged in harsh working environments such as high temperature and high corrosion. The measurement accuracy is significantly reduced. Thermocouples themselves do not have a cooling system and cannot be used in furnace areas with higher temperatures. The acoustic temperature measurement method is prone to large errors in calculations because the sound waves do not propagate in a straight line in the harsh environment of the furnace, and there are problems such as bending. The image method is very easy to cause the camera to produce light saturation and burn out due to the extremely high brightness of the flame in the furnace. The camera is difficult to maintain and maintain in the complex and changeable environment of the boiler, and the installation and fixing process of the lens is difficult. The infrared temperature measurement method has the advantages of high sensitivity, fast response, and good real-time performance. However, in actual applications, there are problems such as inappropriate selection of temperature measurement frequency bands, inaccurate emissivity, resulting in large measurement errors, and coking and clogging of the temperature measurement system measurement holes, resulting in failure of the temperature measurement system, and complex gas composition in the furnace affecting infrared spectrum absorption.

[0004] In the prior art, the invention patent with patent publication number CN118424496A discloses a method for detecting the furnace temperature of an incineration boiler based on a waste incineration power plant. The furnace temperature of the incineration boiler is obtained by ultrasonic temperature measurement technology, and compared with the temperature detected by thermocouples and historical data, the credibility of the temperature data collected by the ultrasonic temperature measurement is evaluated, and the collected temperature data is pre-processed. By comparing different measurement methods, it is possible to promptly detect abnormalities or errors in the temperature measurement method, thereby avoiding analysis of erroneous temperature data, thereby improving the accuracy of the incineration boiler furnace temperature detection. The patent uses thermocouples and ultrasonic methods for temperature measurement. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem of inaccurate furnace temperature measurement.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A furnace flame temperature measurement method based on radiation heat exchange, comprising: extending a measuring device into a boiler furnace, wherein the area A of a measuring probe of the measuring device is known; the inside of the measuring probe is cooled by a fluid, and the inlet fluid temperature T1, the outlet fluid temperature T2, the cooling fluid specific heat capacity c and the fluid mass flow rate q are measured. m The measuring probe receives the radiation heat of the boiler furnace flame at that location. The heat released by the radiation heat exchange of the high-temperature flue gas in the boiler furnace is taken away by the cooling fluid passing through the measuring probe, ensuring that the temperature T0 of the cooling fluid entering the measuring probe remains unchanged. After the radiation heating surface of the measuring probe forms a steady-state heat exchange with the boiler furnace flame at that location, the boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ of the boiler furnace are determined. A The total effective heating area F of the furnace is combined with the area A of the measuring probe, and the parameters T1, T2, c, q of the measuring device itself are measured. m , obtain the boiler furnace flame temperature at that location.

[0008] Advantages: The present invention measures the furnace flame temperature based on the principle of radiation heat transfer. The measuring probe receives the radiation heat from the furnace and is not affected by fly ash, dust, etc. in the furnace. The residence time in the furnace is short and there is no serious coking problem on the surface. Even if coking occurs, it only needs to be taken out and cleaned quickly manually, and the measurement accuracy is not affected. It is portable and convenient, does not require fixed installation, has high sensitivity, fast response, and good real-time performance.

[0009] In one embodiment of the present invention, the measuring device includes a PLC controller, which presets and calibrates the corresponding boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ under different boiler furnace sizes, different combustion modes, different pollution coefficients and operating data, and different measurement probe areas A. A, the total effective heating area of ​​the furnace F, and store it in the PLC controller; when measuring, according to the needs, select different calibration conditions, only need to measure the heat brought out by the cooling fluid, the PLC controller according to the boiler furnace flame temperature T G The calculation formula directly outputs the boiler furnace flame temperature T G .

[0010] In one embodiment of the present invention, a measuring probe 11, a liquid inlet pipe 12, a liquid return pipe 13, an inlet temperature measuring meter 14, an outlet temperature measuring meter 15, a PLC controller 16, a data input terminal device 17 and a flow meter 31;

[0011] The thrust generated by the power device 23 causes the cooling fluid to enter the measuring probe 11 through the liquid inlet pipe 12. The inlet temperature measuring meter 14 is arranged beside the liquid inlet of the measuring probe 11 to measure the temperature of the cooling fluid when it flows into the measuring probe 11.

[0012] Under the disturbance of the cooling fluid spoiler 111 inside the measuring probe 11, stable convection heat exchange occurs through the radiation heating surface 112 of the measuring probe 11, and the cooling fluid after heat exchange flows out of the measuring probe 11 through the return pipe 13, and the temperature T0 of the cooling fluid entering the measuring probe 11 is guaranteed to be constant; the outlet temperature measuring meter 15 is arranged beside the liquid outlet of the measuring probe 11 to measure the temperature of the cooling fluid when it flows out of the measuring probe 11;

[0013] The cooling fluid flows through the flow meter 31 via the return pipe 13, and the PLC controller 16 is connected with the inlet temperature measuring meter 14, the outlet temperature measuring meter 15, the data input terminal device 17, and the flow meter 31 via a data transmission line.

[0014] In one embodiment of the present invention, the measuring device includes a cooling device 21, a heating device 22 and a power device 23;

[0015] The cooling fluid passes through the return pipe 13, flows through the flow meter 31, and then passes through the cooling device 21 to complete a cycle; wherein the heating device 22 is arranged between the cooling device 21 and the power device 23, indirectly connecting the liquid inlet pipe 12 and the return pipe 13;

[0016] The PLC controller 16 is connected to the cooling device 21 , the heating device 22 , and the power device 23 via control lines.

[0017] In one embodiment of the present invention, in order to ensure that the temperature of the cooling fluid in the measuring probe 11 is maintained unchanged at T0, a temperature threshold N is preset. If the inlet fluid temperature T1 satisfies T1-T0>N, the PLC controller 16 controls the cooling device 21 to start the cooling fluid. If the inlet fluid temperature T1 satisfies T0-T1>N, the PLC controller 16 controls the heating device 22 to start the heating fluid.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention measures the furnace flame temperature based on the principle of radiation heat exchange, the surface of the measuring probe is a radiation heating surface, the interior of the measuring probe is a convection heat exchange, and the heat transfer principle is used to link the relevant parameters in the steady-state radiation heat exchange and convection heat exchange processes with the heat transfer amount, and the furnace flame temperature is deduced based on the heat transfer amount.

[0019] (1) Not affected by the medium in the furnace, there is no problem of fly ash, dust, furnace brightness, etc. that affects the measurement accuracy;

[0020] (2) The measuring equipment is portable and has a short residence time in the furnace. There is no serious coking problem on the surface. Even if coking occurs, it only needs to be taken out and cleaned quickly manually, and the measurement accuracy will not be affected.

[0021] (3) The device of the present invention is portable and convenient, does not require fixed installation, has high sensitivity, fast response, and good real-time performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The invention discloses a furnace flame temperature measuring device based on radiation heat exchange according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] The present invention discloses a furnace flame temperature measurement method based on radiation heat exchange, and the present invention measures the furnace flame temperature based on the radiation heat exchange principle. The radiation heat exchange principle is as follows:

[0026] The way objects transfer energy through electromagnetic waves without contact is called radiation. The heat exchange through radiation is called radiation heat transfer. Radiation heat transfer is also one of the three heat transfer methods in nature. The heat transfer of radiation heat transfer is calculated using the Stefan-Boltzmann law. For a heated surface with a heat transfer area of ​​A0, the heat transfer is Where T G0 is the temperature of the heat source, T A0 is the temperature of the heated surface, and σ is the Stefan-Boltzmann constant. In engineering calculations, whether the heated surface is cooled or heated, the heat transfer is always positive.

[0027] Applying the radiation heat transfer principle to measure the furnace flame temperature leads to the following conclusions:

[0028] For the furnace of a pulverized coal boiler, when the fuel burns in the furnace, a large amount of heat is released, and the temperature in the center of the flame is as high as 1500-1600℃. When conducting heat transfer analysis in engineering, the heat transfer process in the furnace is industrially simplified. The heat transfer in the furnace only considers the heat exchange of radiation heat transfer, and ignores the convection heat transfer that accounts for about 5% of the total heat transfer. If the average effective temperature of the furnace flame is T G , then the heat Φ transferred to the radiation heating surface A per hour is:

[0029]

[0030] In the formula, a1 represents the furnace blackness of the boiler, ∑x i A i It is expressed as the total radiation heating area of ​​the heating surface A in the furnace, x i Expressed as the heating surface angle coefficient, it refers to the radiation energy emitted by the furnace flame, T A Expressed as the surface temperature of the radiation heating surface (taking dust pollution into account), It is expressed as the degree to which the heat absorption of the heated surface is reduced due to pollution, and is expressed as the pollution coefficient ζ A The pollution coefficient value is related to factors such as fuel properties, combustion conditions, and heating surface structure. You can refer to books such as "Boiler Principles" and "Boiler Unit Thermal Calculation-Standard Methods" to obtain empirical values. Obviously, the more serious the pollution of the heating surface, the higher the T A The larger the value, the larger the value. i =ζ i x i , called the thermal effectiveness coefficient of the heating surface, then for a heating surface with an area of ​​A:

[0031] Where F is the total effective heating area of ​​the furnace. The formula can be rewritten as:

[0032]

[0033] The furnace blackness is an imaginary blackness corresponding to the effective radiation of the flame introduced for furnace thermal calculation. It is used to reflect the relationship between the heat radiation exchange between the flame and the heating surface of the water-cooled wall. Calculations show that the furnace blackness of coal-fired boilers is related to the flame blackness. h It is related to the thermal effectiveness coefficient. That is:

[0034]

[0035] In the formula, k y is the radiation attenuation coefficient of the triatomic gas, calculated according to the empirical formula or obtained from the line graph in the relevant standard, (1 / (m·MPa));

[0036] r is the total volume fraction of triatomic gas, which can be calculated based on the elemental analysis of the coal quality input to the furnace, (%);

[0037] k h is the radiation attenuation coefficient of the ash particles, which can be calculated using the empirical formula or found in the line graph in the relevant standards.

[0038] (1 / (m·MPa));

[0039] μ h is the ash concentration in the flue gas, which can be calculated based on the elemental analysis of the coal quality input to the furnace and the operating oxygen content, (μm);

[0040] C1 and C2 are dimensionless quantities that take into account the influence of coke particle concentration. C1 depends on the type of fuel, and C2 depends on the combustion method. Both are fixed values.

[0041] p is the pressure of the medium in the furnace, and for normal pressure boiler p = 0.1MPa, (MPa);

[0042] S is the effective thickness of the radiation layer of the medium in the furnace, which is related to the furnace size (m).

[0043] From the above formula, it can be seen that for a fixed coal-fired boiler, when the input fuel and operation mode are known, the radiation heat transfer Φ received by the heating surface with a heating area of ​​A at a certain point in the furnace is equal to the radiation average effective temperature T of the furnace flame at that point. G One-to-one correspondence, the specific value of the radiation heat transfer Φ can be obtained to calculate the average effective temperature T of the furnace flame radiation at that location G , that is, the furnace flame temperature at that location.

[0044] Based on the above working principle, the furnace flame temperature measurement method based on radiation heat exchange provided by the present invention includes: extending the measuring device into the furnace of the boiler, and the area A of the measuring probe of the measuring device is known. The inside of the measuring probe is cooled by fluid, and its inlet fluid temperature T1, outlet fluid temperature T2, cooling fluid specific heat c and fluid mass flow q m The measuring probe receives the radiation heat from the flame in the boiler furnace. The heat released by the radiation heat exchange of the high-temperature flue gas in the boiler furnace is taken away by the cooling fluid passing through the measuring probe, ensuring that the temperature T0 of the cooling fluid entering the measuring probe remains unchanged, that is, maintaining the inlet fluid temperature T1 and the radiation heating surface temperature T of the measuring probe. w That is, after the heat transfer is stable, the radiation heat transfer Φ received by the radiation heating surface of the measuring probe and the heat Q taken away by the cooling fluid of the measuring probe are A equal.

[0045] After conversion, the formula is:

[0046]

[0047] That is, after the radiation heating surface of the probe to be measured forms a steady-state heat exchange with the boiler furnace flame at that location, the boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ of the boiler furnace are determined. A The total effective heating area F of the furnace is combined with the area A of the measuring probe, and the parameters T1, T2, c, q of the measuring device itself are measured. m , obtain the boiler furnace flame temperature at that location.

[0048] In another embodiment of the present invention, the measuring device includes a PLC controller, which presets and calibrates the corresponding boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ under different boiler furnace sizes, different combustion modes, different pollution coefficients and operating data, and different measurement probe areas A. A , the total effective heating area of ​​the furnace F, and store it in the PLC controller. When measuring, according to the needs, select different calibration conditions, only need to measure the heat brought out by the cooling fluid, the PLC controller according to the boiler furnace flame temperature T G The calculation formula directly outputs the boiler furnace flame temperature T G . Only pre-calibration is required, no PLC controller is required to calculate Q according to the heat transfer formula A and furnace flame temperature T G Correspondence relationship.

[0049] See also Figure 1 As shown, the present invention also provides a furnace flame temperature measuring device based on radiation heat exchange, including a measuring probe 11, a liquid inlet pipe 12, a liquid return pipe 13, an inlet temperature measuring meter 14, an outlet temperature measuring meter 15, a PLC controller 16, a data input terminal device 17 and a flow meter 31.

[0050] The thrust of the cooling fluid generated by the power device 23 enters the measuring probe 11 through the liquid inlet pipe 12. The inlet temperature measuring meter 14 is arranged beside the liquid inlet of the measuring probe 11 to measure the temperature of the cooling fluid when it flows into the measuring probe 11.

[0051] Under the disturbance of the cooling fluid spoiler 111 inside the measuring probe 11, stable convection heat exchange occurs through the radiation heating surface 112 of the measuring probe 11, and the cooling fluid after heat exchange flows out of the measuring probe 11 through the return pipe 13, and the temperature T0 of the cooling fluid entering the measuring probe 11 is guaranteed to remain unchanged; the outlet temperature measuring meter 15 is set next to the liquid outlet of the measuring probe 11 to measure the temperature of the cooling fluid when it flows out of the measuring probe 11.

[0052] The cooling fluid flows through the flow meter 31 via the return pipe 13, and the PLC controller 16 is connected with the inlet temperature measuring meter 14, the outlet temperature measuring meter 15, the data input terminal device 17, and the flow meter 31 via a data transmission line.

[0053] In this embodiment, the measuring probe 11 penetrates into the furnace from the furnace fire hole or the special temperature side hole, and the high temperature flue gas in the furnace exchanges heat with the radiation heating surface 112 of the measuring probe 11 with a surface area A through the furnace radiation 18. The heat Φ released by the radiation heat exchange of the high temperature flue gas in the furnace is taken away by the cooling fluid passing through the inside of the measuring probe 11. The cooling fluid entering the measuring probe 11 maintains a constant temperature T0, that is, the surface temperature T of the radiation heating surface 112 of the measuring probe 11 is ensured to be constant. w The heat carried away by the cooling fluid is Q A = equal to the radiation heat transfer Φ. For a fixed radiation heating surface 112, the boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ A After the data of the total effective heating area F of the furnace is determined, the relevant operating parameters are input through the data input terminal device 17 and enter the PLC controller 16 through the operating data transmission line. G and heat transfer surface temperature T w When a certain value is given, the radiation heat transfer Φ and the convection heat transfer Q A The only corresponding value. By measuring the heat taken away by the cooling fluid, the boiler furnace flame temperature T at the measuring probe position can be inferred. G .

[0054] In this embodiment, the measuring device includes a cooling device 21, a heating device 22 and a power device 23. The cooling fluid flows through the return pipe 13, passes through the flowmeter 31, and then passes through the cooling device 21 to complete a cycle. The heating device 22 is arranged between the cooling device 21 and the power device 23, and indirectly connects the inlet pipe 12 and the return pipe 13. The PLC controller 16 is connected to the cooling device 21, the heating device 22, and the power device 23 through a control line. In order to ensure that the temperature of the cooling fluid in the measuring probe 11 is maintained at T0, a temperature threshold N is preset. If the inlet fluid temperature T1 satisfies T1-T0>N, the PLC controller 16 controls the cooling device 21 to start cooling the fluid. If the inlet fluid temperature T1 satisfies T0-T1>N, the PLC controller 16 controls the heating device 22 to start heating the fluid. Among them, the temperature threshold N is a positive number.

[0055] In this embodiment, the cooling fluid entering the measuring probe 11 maintains T0 unchanged, the outlet fluid temperature T2 is measured by the outlet temperature measuring meter 15, and the flow meter 31 measures the fluid mass flow rate q mThe PLC controller 16 calculates the heat Q taken away by the cooling fluid within a period of time A t is the time, and according to the operating parameters input by the data input terminal device 17, the PLC controller 16 directly calculates the furnace flame temperature T at the position of the measuring probe 11 G . Where T0 is a set value.

[0056] In this embodiment, the shape of the measuring probe 11 is not limited to a cylinder, and the shape of the measuring probe 11 can be a sphere, a cuboid, or a polygonal prism. The cooling device 21 can be air-cooled, water-cooled, oil-cooled, etc. The heating device 22 is not limited to electric heating, and can be water bath heating, oil bath heating, etc. And the power device 23 is a motor. Because the radiation heating surface area of ​​the measuring probe 11 is limited, the radiation heat exchange amount is strictly controlled, and the flow rate of the cooling fluid can be adjusted, the cooling fluid convection heat exchange process does not involve phase change heat transfer.

[0057] In this embodiment, the present invention measures the furnace flame temperature based on the principle of radiation heat transfer. The measuring probe receives the radiation heat from the furnace and is not affected by fly ash, dust, etc. in the furnace. The residence time in the furnace is short and there is no serious coking problem on the surface. Even if coking occurs, it only needs to be taken out and cleaned quickly manually, and the measurement accuracy is not affected.

[0058] In this embodiment, the radiation heat transfer is proportional to the fourth power of the temperature. Therefore, when the temperature is lower than 800°C, the radiation heat transfer drops sharply, which will also affect the accuracy of the measurement data. The present invention is mainly used in the furnace of a pulverized coal boiler with a temperature higher than 800°C, and is not suitable for measurement in low temperature areas.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0060] The above-described embodiments merely represent implementation methods of the invention. The protection scope of the present invention is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for measuring furnace flame temperature based on radiation heat exchange, characterized in that: include: The measuring device is inserted into the boiler furnace. The area A of the measuring probe of the measuring device is known. The inside of the measuring probe is cooled by fluid. Its inlet fluid temperature T1, outlet fluid temperature T2, cooling fluid specific heat c and fluid mass flow q m The measuring probe receives the radiation heat of the boiler furnace flame at that location. The heat released by the radiation heat exchange of the high-temperature flue gas in the boiler furnace is taken away by the cooling fluid passing through the measuring probe, ensuring that the temperature T0 of the cooling fluid entering the measuring probe remains unchanged. After the radiation heating surface of the measuring probe forms a steady-state heat exchange with the boiler furnace flame at that location, the boiler furnace blackness a1, Stefan-Boltzmann constant σ, and pollution coefficient ζ of the boiler furnace are determined. A The total effective heating area F of the furnace is combined with the area A of the measuring probe, and the parameters T1, T2, c, q of the measuring device itself are measured. m , obtain the boiler furnace flame temperature at that location.

2. The furnace flame temperature measurement method according to claim 1, characterized in that: Boiler furnace flame temperature T G , obtained by the following formula:

3. The method for measuring furnace flame temperature based on radiation heat exchange according to claim 2, characterized in that: The measuring device includes a PLC controller, which is preset to calibrate the corresponding boiler furnace blackness a1, Stefan-Boltzmann constant σ, pollution coefficient ζ under different boiler furnace sizes, different combustion modes, different pollution coefficients and operating data, and different measurement probe areas A. A , the total effective heating area of ​​the furnace F, and store it in the PLC controller; when measuring, according to the needs, select different calibration conditions, only need to measure the heat brought out by the cooling fluid, the PLC controller according to the boiler furnace flame temperature T G The calculation formula directly outputs the boiler furnace flame temperature T G .

4. A furnace flame temperature measurement device based on radiation heat exchange, characterized in that: include: A measuring probe (11), a liquid inlet pipe (12), a liquid return pipe (13), an inlet temperature measuring meter (14), an outlet temperature measuring meter (15), a PLC controller (16), a data input terminal device (17) and a flow meter (31); The thrust of the cooling fluid generated by the power device (23) enters the measuring probe (11) through the liquid inlet pipe (12), and the inlet temperature measuring meter (14) is arranged next to the liquid inlet of the measuring probe (11) to measure the temperature of the cooling fluid when it flows into the measuring probe (11); Under the disturbance of the cooling fluid spoiler (111) inside the measuring probe (11), stable convection heat exchange occurs through the radiation heating surface (112) of the measuring probe (11), and the cooling fluid after heat exchange flows out of the measuring probe (11) through the return pipe (13), and the temperature T0 of the cooling fluid entering the measuring probe (11) is ensured to be constant; an outlet temperature measuring meter (15) is arranged next to the liquid outlet of the measuring probe (11) to measure the temperature of the cooling fluid when it flows out of the measuring probe (11); The cooling fluid flows through the flow meter (31) via the return pipe (13), and the PLC controller (16) is connected with the inlet temperature measuring meter (14), the outlet temperature measuring meter (15), the data input terminal device (17), and the flow meter (31) via a data transmission line.

5. The furnace flame temperature measuring device based on radiation heat exchange according to claim 4 is characterized in that: The measuring device comprises a cooling device (21), a heating device (22) and a power device (23); The cooling fluid passes through the liquid return pipe (13), flows through the flow meter (31), and then passes through the cooling device (21), completing a cycle; wherein the heating device (22) is arranged between the cooling device (21) and the power device (23), and indirectly connects the liquid inlet pipe (12) and the liquid return pipe (13); The PLC controller (16) is connected to the cooling device (21), the heating device (22) and the power device (23) via control lines.

6. The furnace flame temperature measuring device based on radiation heat exchange according to claim 5 is characterized in that: In order to ensure that the temperature of the cooling fluid in the measuring probe (11) is maintained at T0, a temperature threshold N is preset. If the inlet fluid temperature T1 satisfies T1-T0>N, the PLC controller (16) controls the cooling device (21) to start cooling the fluid. If the inlet fluid temperature T1 satisfies T0-T1>N, the PLC controller (16) controls the heating device (22) to start heating the fluid.

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