Multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device
Through the multi-dimensional and multi-point water-cooled wall high-temperature heat flux meter measurement device, using axial and radial movement mechanisms and cooling systems, the problems of inaccurate single-point measurement and easy detachment of thermocouples are solved, the accuracy of multi-dimensional measurement and the long life of thermocouples are achieved, and the operation complexity and maintenance costs are reduced.
Patent Information
- Application Number
- CN202510840591.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-23
- Publication Date
- 2025-09-26
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing boiler water wall heat flow measurement method can only measure at a single point, and the thermocouple is easily detached due to uneven contact caused by boiler expansion and vibration, affecting the measurement accuracy. The operation is cumbersome and the maintenance cost is high.
A multi-dimensional and multi-point water-cooled wall high-temperature heat flux meter measuring device is used, including axial and radial moving mechanisms, combined with temperature detection and cooling mechanisms. Multi-dimensional measurement of the temperature detection mechanism is achieved through guide rails and fixings, and a high thermal conductivity metal heat conducting head and a clamping mechanism are used to maintain close contact, and a cooling mechanism is equipped to prevent overheating.
It realizes multi-dimensional and multi-point measurement, ensures measurement accuracy, reduces layout complexity, extends thermocouple life, and reduces maintenance costs.
Smart Images
Figure CN120702631A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of high-temperature heat flux meter measurement, and in particular relates to a multi-dimensional and multi-point water-cooled wall high-temperature heat flux meter measurement device. Background Art
[0002] In high-temperature industrial processes, boilers, as essential energy conversion equipment, play a key role in industries such as power, steel, and chemicals. However, during variable load operation, poor combustion and inefficient steam-water circulation can easily lead to widespread overheating of the water-walls. In severe cases, this can cause tube bursts, severely impacting the safe operation and efficiency of the boiler. To address this issue, monitoring the heat flux density of the water-walls becomes crucial. This is a key parameter for ensuring safe and stable equipment operation and is crucial for controlling and optimizing process flows.
[0003] Currently, the main method for measuring heat flux in boiler water walls is to use a heat flux meter. This involves drilling holes in heat-conducting components and pre-embedding or welding thermocouples to directly measure heat flux changes in the water wall tubes. Alternatively, a base, thermocouple, and connecting components are used. The base is welded to the water wall fins, and the thermocouple is connected to the base via the connecting components. The temperature difference between the far end of the water wall's backfire side and the far end of the finned tube on the backfire side is measured, and the temperature difference is further converted into a relationship with the heat flux density to obtain the water wall heat flux density at that measurement point.
[0004] However, existing heat flux density tests typically involve directly welding thermocouples or fixing their bases to water-wall fins. This means a single heat flow meter can only measure a single point, limiting the measurement range. Furthermore, boiler expansion and vibration can lead to uneven contact between the heat flow meter probe and the water-wall surface, making it prone to falling off and damaging the probe. The uncertainty of the thermocouple's preload force can also affect measurement accuracy. Finally, deploying multiple heat flow meters in practice results in cumbersome operation, complex layout, and high maintenance costs. Summary of the Invention
[0005] The object of the present invention is to provide a multi-dimensional and multi-point water-cooled wall high-temperature heat flow meter measuring device to solve the above-mentioned technical problems.
[0006] In order to solve the above technical problems, the specific technical solution of the multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device of the present invention is as follows: A multi-dimensional and multi-point water-cooled wall high-temperature heat flux meter measuring device includes: an axial moving mechanism, a radial moving mechanism, a temperature detection mechanism and a cooling mechanism. The temperature detection mechanism and the cooling mechanism are installed on the radial moving mechanism, the radial moving mechanism is installed on the axial moving mechanism, and the axial moving mechanism is installed on the water-cooled wall. The axial moving mechanism is used to realize axial movement of the temperature detection mechanism, and the radial moving mechanism is used to realize radial movement of the temperature detection mechanism, thereby realizing multi-dimensional and multi-point measurement in the axial and radial directions. The cooling mechanism is used to cool the temperature detection mechanism.
[0007] Furthermore, the axial movement mechanism includes a guide rail, a fixing part and a screw. The guide rail is arranged along the axial direction of the water-cooled wall tube and is fixed to the water-cooled wall fin by spot welding to provide guidance and support for the fixing part. The fixing part can move freely along the axial direction of the water-cooled wall tube on the guide rail, and the screw is used to axially position the fixing part.
[0008] Furthermore, the radial movement mechanism includes a second guide rail, a second fixing part and a second screw. The second guide rail is arranged along the radial direction of the water-cooled wall tube and is fixed to the first fixing part by spot welding to provide guidance and support for the second fixing part. The second fixing part can move freely along the radial direction of the water-cooled wall tube on the second guide rail, and the second screw is used to radially position the second fixing part.
[0009] Furthermore, the fixing part 1 and the fixing part 2 are provided with elliptical grooves, and the temperature detection mechanism has two groups, which are used to detect the back-fire side temperature of the water-cooled wall tube and the water-cooled wall fin respectively. The two groups of temperature detection mechanisms move in the elliptical grooves and adjust the relative measurement positions.
[0010] Furthermore, each set of temperature detection mechanisms includes an outer sleeve of a support body, a compression spring, a thermocouple, a metal thermal conductive head, a signal converter and a computer; the outer sleeve of the support body is installed on fixing piece one and fixing piece two, the metal thermal conductive head is fixedly connected to the lower end of the outer sleeve of the support body, the thermocouple is inserted into the outer sleeve of the support body, one end is fixedly connected to the metal thermal conductive head, and the other end is electrically connected to the signal converter, the signal converter is electrically connected to the computer, and the metal thermal conductive head is pressed against the back-fire side of the water-cooled wall tube and the water-cooled wall fin by the compression spring.
[0011] Furthermore, the outer wall of the metal heat conductive head is provided with an external thread, and the inner wall of the outer sleeve of the support body is provided with an internal thread, so that the metal heat conductive head is threadedly connected to the outer sleeve of the support body; the metal heat conductive head is selected from a soft metal material with a high thermal conductivity of an introduction coefficient λ>200W / (m℃) and a Brinell hardness HB<.
[0012] Furthermore, the outer sleeve of the support body has a lower hardness than the metal heat conducting head.
[0013] Furthermore, the temperature detection mechanism also includes an upper limit block and a lower limit block. The upper limit block, lower limit block and compression spring are coaxially arranged at the lower part of the outer sleeve of the support body, and together constitute a compression mechanism, providing a pre-tightening force to press the metal heat conductive head against the part to be tested on the water-cooled wall.
[0014] Furthermore, the upper limit block is fixed below the fixing part, and can move freely on the outer periphery of the outer sleeve of the support body and is limited to the maximum range by the fixing part. The lower limit block is directly screwed on the outer periphery of the outer sleeve of the support body through threaded cooperation. The compression spring is arranged between the upper limit block and the lower limit block. By adjusting the relative distance between the upper limit block and the lower limit block, the length of the compression spring in the axial direction is adjusted to provide different sizes of preload forces.
[0015] Furthermore, the cooling mechanism includes an air inlet duct, an air outlet duct, an electric control valve and an air compressor; the air inlet duct and the air outlet duct are coaxially arranged inside the outer sleeve of the support body, the thermocouple is coaxially arranged inside the air inlet duct, the air outlet duct is used in conjunction with the air inlet duct, and the air outlet duct guides the gas after heat exchange from the thermocouple. A closed gas circuit is formed between the air inlet duct, the air outlet duct and the outer sleeve of the support body, the air inlet duct and the air outlet duct are connected to the electric control valve, the electric control valve is connected to the signal converter and the air compressor, the cooling compressed air generated by the air compressor is delivered to the outer sleeve of the support body for cooling the outer sleeve of the support body and the metal heat conductive head, the signal converter converts the temperature signal detected by the thermocouple into an electrical signal for computer processing, and at the same time transmits the computer's control signal to the electric control valve for valve opening adjustment to control the cooling effect of the measuring device.
[0016] The multi-dimensional and multi-point water-cooled wall high-temperature heat flow meter measuring device of the present invention has the following advantages: (1) The present invention can adjust the spring preload by adjusting the distance between the upper limit stopper and the lower limit stopper, so that the metal heat conductive head always maintains close contact with the water-cooled wall and does not become detached due to vibration or expansion of the water-cooled wall, thereby ensuring measurement accuracy.
[0017] (2) Adding a high thermal conductivity metal heat conducting head increases the heat transfer area, ensuring heat transfer while avoiding wear of the thermocouple and extending its service life.
[0018] (3) The temperature detection mechanism can realize multi-dimensional and multi-point measurement in the axial and radial directions on the guide rail, which reduces the layout complexity and improves the measurement convenience.
[0019] (4) Compressed air is introduced into the outer sleeve of the support body for cooling protection to avoid overheating of the measuring device and extend the service life of the thermocouple. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic side structural diagram of the multi-dimensional and multi-point water-cooled wall high-temperature heat flow meter measuring device of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device of the present invention; Explanation of the marks in the figure: 1. Water-cooled wall; 2. Guide rail 1; 3. Fixing part 1; 4. Guide rail 2; 5. Fixing part 2; 6. Outer sleeve of support body; 7. Air inlet duct; 8. Signal converter; 9. Computer; 10. Electric regulating valve; 11. Air compressor; 12. Air outlet duct; 13. Compression spring; 14. Thermocouple; 15. Metal thermal conductor; 16. Upper limit block; 17. Lower limit block; 18. Screw 1; 19. Screw 2. DETAILED DESCRIPTION
[0021] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a multi-dimensional and multi-point water-cooled wall high-temperature heat flow meter measuring device of the present invention in conjunction with the accompanying drawings.
[0022] like Figure 1 Figure 2 As shown, the water-cooled wall 1 is the main area for heat transfer with the furnace. The water-cooled wall 1 is arranged around the boiler furnace to absorb the radiation heat of the high-temperature combustion products in the furnace. It mainly includes water-cooled wall tubes 20 and connected water-cooled wall fins 21.
[0023] The present invention provides a multi-dimensional and multi-point water-cooled wall high-temperature heat flux meter measuring device, which can be used for testing the heat flux density of the heated surface of the boiler water-cooled wall. The device includes: an axial moving mechanism, a radial moving mechanism, a temperature detection mechanism and a cooling mechanism. The temperature detection mechanism and the cooling mechanism are installed on the radial moving mechanism, the radial moving mechanism is installed on the axial moving mechanism, and the axial moving mechanism is installed on the water-cooled wall 1. The axial moving mechanism is used to realize the axial movement of the temperature detection mechanism, and the radial moving mechanism is used to realize the radial movement of the temperature detection mechanism, thereby realizing multi-dimensional and multi-point measurement in the axial and radial directions. The cooling mechanism is used to realize cooling of the temperature detection mechanism.
[0024] The axial movement mechanism includes a guide rail 2, a fixing part 3 and a screw 18. The guide rail 2 is arranged along the axial direction of the water-cooled wall tube 20 and is fixed to the water-cooled wall fin 21 by spot welding to provide guidance and support for the fixing part 3. The welding contact point is less than 2mm. 2 The fixing member 3 can move freely along the axial direction of the water-cooled wall tube on the guide rail 2, and is axially positioned by the screw 18 after moving to a suitable position.
[0025] The radial movement mechanism includes a guide rail 24, a fixing part 25 and a screw 219. The guide rail 24 is arranged along the radial direction of the water-cooled wall tube 20 and is fixed to the fixing part 13 by spot welding to provide guidance and support for the fixing part 25. The welding contact point is less than 2mm. 2 The second fixing member 5 can move freely along the radial direction of the water-cooled wall tube on the second guide rail 4, and is radially positioned by the second screw 19 after moving to a suitable position.
[0026] Guide rail 1 2 and guide rail 2 4 together constitute the guiding and supporting function of the temperature detection mechanism.
[0027] Fixing element 1 (3) and fixing element 2 (5) are provided with oval grooves. Two sets of temperature detection mechanisms are used to detect the back-fire side temperatures of the water-wall tubes 20 and fins 21, respectively. The two sets of temperature detection mechanisms can be moved within the grooves to adjust their relative measurement positions. Once the positions of fixing element 1 (3) and fixing element 2 (5) are adjusted, they are securely fastened with screws.
[0028] Each temperature detection mechanism includes a support outer sleeve 6, a compression spring 13, a thermocouple 14, a metal thermal head 15, an upper limit block 16, a lower limit block 17, a signal converter 8, and a computer 9. The support outer sleeve 6 is mounted on fixing member 1 3 and fixing member 2 5. The metal thermal head 15 is fixedly connected to the lower end of the support outer sleeve 6. The thermocouple 14 penetrates into the support outer sleeve 6, with one end fixedly connected to the metal thermal head 15 and the other end electrically connected to the signal converter 8. The signal converter 8 is electrically connected to the computer 9. The metal thermal head 15 is compressed against the back-fire side of the water-cooled wall tube 20 and water-cooled wall fin 21 by the compression spring 13.
[0029] The metal heat-conducting head 15 is made of a metal material with a high thermal conductivity, which increases the heated area of the thermocouple 14 and improves heat conduction. It can effectively and promptly transmit temperature changes of the water-cooled wall. While ensuring heat transfer, it also prevents wear of the thermocouple 14 and extends the service life of the thermocouple. The outer wall of the metal heat-conducting head 15 is provided with an external thread, and the inner wall of the support outer sleeve 6 is provided with an internal thread, so that the metal heat-conducting head 15 and the support outer sleeve 6 are threadedly connected. The metal heat-conducting head 15 is made of a soft metal material with a high thermal conductivity coefficient λ greater than 200W / (m°C) and a Brinell hardness HB less than 50.
[0030] The outer sleeve 6 of the support body is made of soft metal material with high thermal conductivity, which has good cooling effect and effectively reduces measurement error. The material can be made of copper, silver and other thermal conductive materials with lower hardness, which is lower than the metal thermal conductive head 15.
[0031] The upper limit block 16, the lower limit block 17 and the compression spring 13 are coaxially arranged at the lower part of the outer sleeve 6 of the support body, and together constitute a compression mechanism, which provides a pre-tightening force to press the metal thermal conductive head 15 against the part to be measured on the water-cooled wall 1, thereby avoiding the probe falling off or poor contact due to vibration or expansion of the boiler.
[0032] The upper limit block 16 is fixed below the fixing part 3 and can move freely on the periphery of the outer sleeve 6 of the support body and is limited to the maximum range by the fixing part 3. The lower limit block 17 is directly screwed on the outer peripheral surface of the outer sleeve 6 of the support body through threaded cooperation. The compression spring 13 is arranged between the upper limit block 16 and the lower limit block 17. By adjusting the relative distance between the upper limit block 16 and the lower limit block 17, the length of the compression spring 13 in the axial direction is adjusted to provide different sizes of preload forces.
[0033] The cooling mechanism includes an inlet duct 7, an outlet duct 12, an electric control valve 10, and an air compressor 11. The inlet duct 7 and outlet duct 12 are coaxially arranged within the support outer sleeve 6. A thermocouple 14 is coaxially arranged within the inlet duct 7, and the outlet duct 12 works in conjunction with the inlet duct 7. The outlet duct 12 directs the heat-exchanged gas from the thermocouple 14, forming a closed gas circuit between the inlet duct 7, the outlet duct 12, and the support outer sleeve 6. The inlet duct 7 and outlet duct 12 are connected to the electric control valve 10, which is connected to a signal converter 8 and an air compressor 11. The cooling compressed air generated by the air compressor 11 is delivered to the support outer sleeve 6, cooling the support outer sleeve 6 and the metal heat conducting head 15, preventing overheating and extending its service life. The signal converter 8 converts the temperature signal detected by the thermocouple 14 into an electrical signal for processing by the computer 9. It also transmits control signals from the computer 9 to the electric control valve 10 for adjusting the valve opening to control the cooling effect of the measuring device.
[0034] Heat flux meter detection method: The temperature measured by the metal heat conductive head 15 on the back-fire side of the water-cooled wall fin is used as the first measurement temperature, and the temperature measured by the metal heat conductive head 15 on the back-fire side of the water-cooled wall tube is used as the second measurement temperature. The heat flux density of the boiler is obtained based on the difference between the first measurement temperature and the second measurement temperature.
[0035] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.
Claims
1. A multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device, characterized in that: include: An axial moving mechanism, a radial moving mechanism, a temperature detection mechanism and a cooling mechanism, wherein the temperature detection mechanism and the cooling mechanism are mounted on the radial moving mechanism, the radial moving mechanism is mounted on the axial moving mechanism, and the axial moving mechanism is mounted on the water-cooled wall (1). The axial moving mechanism is used to realize the axial movement of the temperature detection mechanism, and the radial moving mechanism is used to realize the radial movement of the temperature detection mechanism, thereby realizing multi-dimensional and multi-point measurement in the axial and radial directions, and the cooling mechanism is used to realize the cooling of the temperature detection mechanism.
2. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 1, characterized in that: The axial movement mechanism includes a guide rail (2), a fixing member (3) and a screw (18). The guide rail (2) is arranged along the axial direction of the water-cooled wall (1) tube and is fixed to the fin of the water-cooled wall (1) by spot welding, providing guidance and support for the fixing member (3). The fixing member (3) can move freely along the axial direction of the water-cooled wall (1) tube on the guide rail (2). The screw (18) is used to axially position the fixing member (3).
3. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 1, characterized in that: The radial movement mechanism includes a guide rail 2 (4), a fixing member 2 (5) and a screw 2 (19). The guide rail 2 (4) is arranged along the radial direction of the water-cooled wall (1) tube and is fixed to the fixing member 1 (3) by spot welding, providing guidance and support for the fixing member 2 (5). The fixing member 2 (5) can move freely along the radial direction of the water-cooled wall (1) tube on the guide rail 2 (4). The screw 2 (19) is used to radially position the fixing member 2 (5).
4. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 3, characterized in that: The fixing member 1 (3) and the fixing member 2 (5) are provided with elliptical grooves. The temperature detection mechanism has two groups, which are used to detect the back-fire side temperature of the water-cooled wall (1) tube and the water-cooled wall (1) fin respectively. The two groups of temperature detection mechanisms move in the elliptical grooves and adjust the relative measurement positions.
5. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 4, characterized in that: Each temperature detection mechanism comprises a support outer sleeve (6), a compression spring (13), a thermocouple (14), a metal heat conducting head (15), a signal converter (8) and a computer (9); the support outer sleeve (6) is mounted on a fixing member 1 (3) and a fixing member 2 (5); the metal heat conducting head (15) is fixedly connected to the lower end of the support outer sleeve (6); the thermocouple (14) is inserted into the support outer sleeve (6), one end of which is fixedly connected to the metal heat conducting head (15) and the other end of which is electrically connected to the signal converter (8); the signal converter (8) is electrically connected to the computer (9); the metal heat conducting head (15) is compressed on the back-fire side of the water-cooled wall (1) tube and the water-cooled wall (1) fin by the compression spring (13).
6. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 5, characterized in that: The outer wall of the metal heat conducting head (15) is provided with an external thread, and the inner wall of the outer sleeve of the support body (6) is provided with an internal thread, so that the metal heat conducting head (15) and the outer sleeve of the support body (6) are threadedly connected; the metal heat conducting head (15) is selected from a soft metal material with a high thermal conductivity coefficient λ>200W / (m°C) and a Brinell hardness HB<.
7. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 5, characterized in that: The support body outer sleeve (6) has a lower hardness than the metal heat conducting head (15).
8. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 5, characterized in that: The temperature detection mechanism also includes an upper limit block (16) and a lower limit block (17). The upper limit block (16), the lower limit block (17) and the compression spring (13) are coaxially arranged at the lower part of the outer sleeve (6) of the support body, and together constitute a compression mechanism, providing a pre-tightening force to press the metal heat conducting head (15) against the part to be measured of the water-cooled wall (1).
9. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 8, characterized in that: The upper limit block (16) is fixed below the fixing member (3) and can move freely on the periphery of the outer sleeve (6) of the support body and is limited to a maximum range by the fixing member (3). The lower limit block is directly screwed on the outer peripheral surface of the outer sleeve (6) of the support body through threaded engagement. The compression spring (13) is arranged between the upper limit block (16) and the lower limit block (17). By adjusting the relative distance between the upper limit block (16) and the lower limit block (17), the length of the compression spring (13) in the axial direction is adjusted to provide different sizes of preload forces.
10. The multi-dimensional multi-point water-cooled wall high-temperature heat flow meter measuring device according to claim 8, characterized in that: The cooling mechanism comprises an air inlet duct (7), an air outlet duct (12), an electric regulating valve (10) and an air compressor (11); the air inlet duct (7) and the air outlet duct (12) are coaxially arranged inside the outer sleeve (6) of the support body, the thermocouple (14) is coaxially arranged inside the air inlet duct (7), the air outlet duct (12) is used in conjunction with the air inlet duct (7), the air outlet duct (12) guides the heat-exchanged gas from the thermocouple (14), and a closed gas circuit is formed between the air inlet duct (7), the air outlet duct (12) and the outer sleeve (6) of the support body, and the air inlet duct (7) The air outlet conduit (12) is connected to the electric regulating valve (10), and the electric regulating valve (10) is connected to the signal converter (8) and the air compressor (11). The cooling compressed air generated by the air compressor (11) is delivered to the outer sleeve of the support body (6) for cooling the outer sleeve of the support body (6) and the metal heat conducting head (15). The signal converter (8) converts the temperature signal detected by the thermocouple (14) into an electrical signal for processing by the computer (9), and at the same time transmits the control signal of the computer (9) to the electric regulating valve (10) for valve opening adjustment to control the cooling effect of the measuring device.