Vacuum degree detection device and method for heat pipe

Abstract

The application provides a kind of vacuum degree detection device and method of heat pipe, it is related to coal-fired boiler flue gas waste heat utilization field, including heat pipe heat exchanger, imaging scanner track, inductive magnetic coil is arranged in imaging scanner track;Heat pipe imaging scanning device, movable scanning heat pipe heat exchanger;Heat pipe heat exchanger monitoring power system is connected with heat pipe imaging scanning device, controls heat pipe imaging scanning device.The application utilizes electromagnetic induction principle to control the movement of heat pipe imaging device by adjusting the size of current to patrol heat pipe heat exchanger, by timing, regularly heat pipe heat exchanger is scanned by thermal imaging, to determine the internal vacuum degree of heat pipe heat exchanger, to ensure the heat exchange performance of heat pipe heat exchanger.Unmanned patrol to heat pipe heat exchanger is realized, and the human cost of equipment operation and maintenance is reduced.

Description

Technical Field

[0001] This invention relates to the field of energy conservation and environmental protection in the utilization of waste heat from flue gas at the outlet of coal-fired boilers, and particularly to a device and method for detecting the vacuum degree of heat pipes. Background Technology

[0002] Thermal power plants are energy-consuming enterprises whose main equipment is coal-fired boilers. In the past decade, low-temperature economizers after the air preheater have been widely adopted in the thermal power industry as an energy-saving device. By reducing the flue gas temperature after the air preheater to around 90℃, the low-temperature economizer can recover heat from the flue gas, efficiently and synergistically remove SO3 from the flue gas, reduce the resistivity of dust, and improve the dust removal efficiency of the electrostatic precipitator. Therefore, while recovering waste heat and saving energy, the low-temperature economizer also provides a beneficial supplement to the environmental protection retrofit of power plant boilers, reducing the cost of environmental protection retrofits and further optimizing the system.

[0003] However, in the past decade, it has been found that conventional shell-and-tube cryogenic economizers are difficult to withstand the scouring of particulate matter in the flue gas downstream of boilers. After a period of operation, the heat exchange tubes are easily worn down. Once the heat exchange tubes are worn through, cooling water leakage will occur, leading to blockage of the flue gas system and potentially jeopardizing the safe operation of the dust collector. Therefore, eliminating the impact of leakage from conventional cryogenic economizers on unit safety and addressing the concerns of power companies regarding the application of cryogenic electrostatic precipitator technology is one of the urgent environmental technology challenges that needs to be solved.

[0004] With the continuous upgrading of domestic technology, a low-temperature economizer using vacuum heat pipes as the main heat exchange element has emerged on the market. Although the low-temperature economizer using vacuum heat pipes as the main heat exchange element overcomes the wear and leakage problems of traditional shell-and-tube low-temperature economizers, the heat exchange performance of the vacuum heat pipe depends entirely on the vacuum level inside the vacuum heat pipe. The vacuum level determines the heat exchange performance of the vacuum heat pipe. Therefore, a method and equipment are needed to detect the vacuum level inside the vacuum heat pipe in real time, and to achieve real-time monitoring of the heat exchange performance of the vacuum heat pipe heat exchanger. Summary of the Invention

[0005] To address the above problems, this invention provides a vacuum degree detection device and method for heat pipes, enabling unmanned inspection of heat pipe heat exchangers and reducing the labor costs of equipment maintenance. The technical problem solved by this invention can be achieved using the following technical solutions:

[0006] A vacuum detection device for a heat pipe includes a heat pipe heat exchanger.

[0007] An imaging scanner track is mounted on top of the heat pipe heat exchanger, and an induction magnetic coil is installed inside the imaging scanner track.

[0008] A heat pipe imaging scanning device is mounted on the imaging scanner track and can move to scan the heat pipe heat exchanger;

[0009] The heat pipe heat exchanger monitoring power system is connected to the heat pipe imaging scanning device and controls the heat pipe imaging scanning device.

[0010] Preferably, the inductive magnetic coil is horizontally arranged at the top of the imaging scanner track; the bottom of the imaging scanner track is inclined at a certain angle, the angle being 10° to 15°; and high and low position buffer modules are respectively provided at the head and tail ends of the bottom of the imaging scanner track.

[0011] Preferably, the bottom of the imaging scanner track is provided with a groove-shaped channel, and the inner limiting surfaces of the track are symmetrically arranged on both sides of the groove-shaped channel.

[0012] Preferably, the heat pipe imaging scanning device includes a positioning module, a positioning module axle, an insulated magnetic coupling, and a remote imaging device; the positioning module axle is disposed below the positioning module, and the bottom of the positioning module is connected to the remote imaging scanner through a groove-shaped channel passing through the imaging scanner track by the insulated magnetic coupling.

[0013] Preferably, the positioning module is made of a magnetic material and has a built-in linear positioning device.

[0014] Preferably, the heat pipe heat exchanger monitoring power system includes a power system and a monitoring and control system.

[0015] Preferably, the power system includes an AC power supply, a current control device, a power switch, and a connecting cable; the AC power supply is connected to the current control device and the power switch via the connecting cable.

[0016] Preferably, the monitoring and control system includes a host computer, which is electrically connected to the current control device and connected to the heat pipe imaging scanning device.

[0017] Preferably, the heat pipe heat exchanger monitoring power system is connected to the heat pipe imaging scanning device by electrical connection or wireless connection.

[0018] A method for detecting the vacuum level of a heat pipe includes the following steps:

[0019] When the vacuum detection device is activated, the current of the induction magnetic coil in the imaging scanner track is turned on. The heat pipe heat exchanger monitors the power system and adjusts the current until the heat pipe imaging scanning device is turned on and enters the unattended inspection state. At this time, the current value is A1.

[0020] The heat pipe heat exchanger monitoring power system increases the current to move the heat pipe imaging scanning device to the termination position. At this time, the current value is A2. The heat pipe heat exchanger monitoring power system receives the vacuum degree of the heat pipe heat exchanger collected by the heat pipe imaging scanning device, judges and analyzes it.

[0021] The heat pipe heat exchanger is in good condition. The heat pipe heat exchanger monitoring power system adjusts the current A2 to A3. The heat pipe imaging scanning device returns to its initial position. The heat pipe heat exchanger monitoring power system is powered off. The heat pipe imaging scanning device re-enters sleep mode, completing the detection.

[0022] If the heat pipe heat exchanger is in an abnormal state, the coordinates of the abnormal location K are determined. The heat pipe heat exchanger monitoring power system issues a command and adjusts the current A2 to A3. When the heat pipe imaging scanning device is at the abnormal location coordinates K, the heat pipe heat exchanger monitoring power system issues a command and adjusts the current A3 to A4 to ensure that the position of the heat pipe imaging scanning device is fixed, and further imaging scans are performed on the faulty heat pipe heat exchanger to confirm the fault.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) It organically combines the imaging scanner track, heat pipe imaging scanning device and heat pipe heat exchanger monitoring power system; it realizes real-time monitoring of the vacuum degree of heat pipe heat exchanger and feeds it back to the host computer, realizing unmanned monitoring and saving manpower costs.

[0025] (2) The remote imaging scanner is connected to the positioning module and the positioning module axle through an insulated coupling rod, which reduces the magnetic field force generated by the induction magnetic coil inside the imaging scanner track from interfering with the signal of the remote imaging scanner, magnetization turbulence, temperature effect and magnetic hysteresis effect.

[0026] (3) An inner limiting surface is set in the imaging scanner track, which works in conjunction with the high-level buffer module and the low-level buffer module set at both ends of the imaging scanner track to ensure that the heat pipe imaging scanning device moves stably along the set track. The direction of the track can be flexibly adjusted according to the operation and use requirements, which improves the applicability of monitoring operation.

[0027] (4) By using the power switch, any induction magnetic coil can be energized, thereby activating any heat pipe imaging scanning device, thus improving the operating economy of the vacuum heat pipe heat exchange system.

[0028] (5) By utilizing the oblique and vertical forces generated by the coil energized in the track beam, and cooperating with the wheel axle of the positioning module, the remote imaging scanner is controlled to move within the track. The upward, downward, fixed, and suspended movement of the heat pipe imaging scanning device, as well as the moving speed of the remote imaging scanner, are flexibly controlled through the current control device, thereby completing the accurate imaging scanning of heat pipe heat exchangers in different areas, completing the real-time monitoring of the vacuum degree of each heat pipe, and achieving the purpose of intelligent inspection. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a vacuum detection device for a heat pipe according to the present invention.

[0030] Figure 2 This is a side view schematic diagram of the imaging scanner track of the present invention.

[0031] Figure 3 This is a schematic diagram of the heat pipe imaging scanning device of the present invention.

[0032] Figure 4 This is a schematic diagram of the power system for monitoring the heat pipe heat exchanger of the present invention.

[0033] Figure 5 This is a schematic diagram showing the connection between the imaging scanner track and the heat pipe imaging scanning device of the present invention.

[0034] Figure 6 This is a schematic diagram of the principle of a heat pipe vacuum degree detection method module according to the present invention.

[0035] In the diagram: 1. Heat pipe heat exchanger; 2. Imaging scanner track; 3. Heat pipe imaging scanning device; 4. Heat pipe heat exchanger monitoring power system; 5. Induction magnetic coil; 21. Track inner limiting surface; 22. High-level buffer module; 23. Low-level buffer module; 31. Positioning module; 32. Positioning module wheel axle; 33. Remote imaging scanner; 34. Insulating magnetic coupling; 41. AC power supply; 42. Current control device; 43. Power switch; 44. Connecting cable; 45. Host computer. Detailed Implementation

[0036] To illustrate the technical content, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. However, the embodiments of the present invention are not limited thereto.

[0037] The most crucial concept of this invention lies in providing a method and apparatus for detecting the vacuum level of heat pipes, enabling unmanned inspection of heat pipe heat exchangers and reducing the labor costs of equipment maintenance. It primarily utilizes a remote imaging device that can move freely along an imaging scanner track to periodically perform thermal imaging scans on the upper end of the heat pipe heat exchanger to determine the internal vacuum level, thereby ensuring the heat exchange performance of the heat pipe heat exchanger. Simultaneously, a monitoring and control system can adjust the magnetic force of the coil inside the track by regulating the current, flexibly adjusting the movement and positioning of the remote imaging scanner within the track to achieve accurate detection of each heat pipe.

[0038] like Figure 1-5 As shown, an embodiment of the present invention provides a vacuum degree detection device for a heat pipe, including a heat pipe heat exchanger 1.

[0039] The imaging scanner track 2 is mounted on top of the heat pipe heat exchanger 1, and an induction magnetic coil 5 is installed inside the imaging scanner track 2. The top of the imaging scanner track 2 is horizontal, and the bottom is inclined at an angle of 10° to 15° with the horizontal plane. The induction magnetic coil 5 is arranged horizontally along the top of the beam of the imaging scanner track 2. A groove-shaped channel is opened at the bottom of the imaging scanner track 2, and the inner limiting surface 21 is symmetrically arranged on both sides of the groove-shaped channel. A high-level buffer module 22 and a low-level buffer module 23 are respectively provided at the beginning and end of the bottom of the imaging scanner track 2, forming a closed space for the imaging scanner track 2, reducing the signal interference, magnetization turbulence, temperature effect and magnetic hysteresis effect of the magnetic field force generated by the induction magnetic coil 5 inside the imaging scanner on the remote imaging scanner 33.

[0040] A heat pipe imaging scanning device 3 is mounted on an imaging scanner track 2 and scans the heat pipe heat exchanger 1 by sliding within a grooved channel. The heat pipe imaging scanning device 3 includes a positioning module 31, a positioning module axle 32, an insulated magnetic coupling rod 34, and a remote imaging device. The positioning module 31 is made of a magnetic material and incorporates a linear positioning device. The positioning module axle 32 is located below the positioning module 31 to ensure linear movement of the positioning module 31 within the imaging scanner track 2 and to reduce resistance caused by sliding. The bottom of the positioning module 31 is connected to the remote imaging scanner 33 via the insulated magnetic coupling rod 34, which passes through the grooved channel of the imaging scanner track 2.

[0041] The heat pipe heat exchanger monitoring power system 4, connected to the heat pipe imaging scanning device 3, includes a power system and a monitoring and control system. The power system includes an AC power supply 41, a current control device 42, a power switch 43, and a connecting cable 44. The AC power supply 41 is connected to the current control device 42 and the power switch 43 via the connecting cable 44. The monitoring and control system includes a host computer system 45, which is connected to the current control device 42 via the connecting cable 44 and can be electrically or wirelessly connected to the heat pipe imaging scanning device 3. In operation, the power switch 43 can flexibly select which track area of ​​the heat pipe imaging scanning device 3 to activate, thus saving system power consumption. The AC power supply 41 is mainly used to power the induction magnetic coil 5 inside the imaging scanner track 2, thereby making the induction magnetic coil 5 magnetic; the current control device 42 is used to adjust the current flowing through the induction magnetic coil 5, thereby controlling the magnitude of the magnetic force generated by the induction magnetic coil 5, and realizing the movement of the heat pipe imaging scanning device 3; and all the monitoring process and structural data of the heat pipe heat exchanger 1 will be fed back and command output in the host computer 45.

[0042] The vacuum degree detection method for heat pipes provided in this embodiment of the invention is applied to, for example... Figure 1 The detection device shown, the method specifically includes the following steps 1)-2), which are described below in conjunction with... Figure 6 Detailed explanation:

[0043] 1) Start the vacuum degree detection device, the current of the induction magnetic coil 5 in the imaging scanner track 2 is turned on, the heat pipe heat exchanger monitoring power system 4 adjusts the current until the heat pipe imaging scanning device 3 is turned on in unattended inspection state, at which time the current value is A1.

[0044] In its initial position, the telephoto imaging scanner 33, which is in a dormant state, is positioned at the edge of the low-level buffer module 23 of the imaging scanner track 2. Figure 1 (As shown in state c). When the detection device is started, the AC power supply 41 begins to output electrical energy, and the power switch 43 is turned on. At this time, the remote imaging scanner 33 starts to work. The current control device 42 is adjusted to the unattended inspection state. At this time, the current flowing through the induction magnetic coil 5 is A1, so that the magnetic force generated by the induction magnetic coil 5 is equal to the weight and friction of the heat pipe imaging scanning device 3 (F=mg+f), thereby realizing that the heat pipe imaging scanning device 3 slides at a constant speed along the imaging scanner track 2.

[0045] 2) The heat pipe heat exchanger monitoring power system 4 increases the current to move the heat pipe imaging scanning device 3 to the termination position. At this time, the current value is A2. The heat pipe heat exchanger monitoring power system 4 receives the vacuum degree of the heat pipe heat exchanger 1 collected by the heat pipe imaging scanning device 3, judges and analyzes it.

[0046] The induction magnetic coil 5 is affected by electromagnetic induction, generating a magnetic field around it. The closer to the induction magnetic coil 5, the stronger the magnetic field force. Therefore, the positioning module 31 experiences different magnetic fields due to its different distance from the induction magnetic coil 5 inside the inclined imaging scanner track 2 at the bottom. The positioning module axle 32 at the bottom of the positioning module 31 carries the imaging scanner obliquely upward along the grooved channel at the bottom of the track. When the system detects that the heat pipe imaging scanning device 3 has reached the high-level buffer module 22... Figure 1 As shown in state a), this indicates that the heat pipe imaging scanning device 3 has reached the termination position for this operation and completed the scan. The current control device 42 will readjust the output current value to value A2, reducing the magnetic field force generated by the induction magnetic coil 5, so that the magnetic field force generated by the induction magnetic coil 5 tends to be equal to the weight and friction of the heat pipe imaging scanning device 3, allowing the heat pipe imaging scanning device 3 to stand by in the termination position. As the remote imaging scanner 33 moves obliquely upward along the imaging scanner track 2, it scans the operating status of all heat pipes along the way one by one and transmits the data back to the host computer 45 for judgment.

[0047] a) Heat pipe heat exchanger 1 is in good condition. Heat pipe heat exchanger monitoring power system 4 adjusts current A2 to A3. Heat pipe imaging scanning device 3 returns to its initial position. Heat pipe heat exchanger monitoring power system 4 is powered off. Heat pipe imaging scanning device 3 re-enters sleep state and completes the detection.

[0048] When the host computer 45 determines that the heat pipe heat exchanger 1 is operating well and the vacuum inside the heat pipe meets the operating requirements, the host computer 45 issues a command, and the current control device 42 readjusts the current value to A3, further reducing the magnetic field force generated by the induction magnetic coil 5, so that the magnetic field force generated by the induction magnetic coil 5 is slightly less than the weight and friction of the heat pipe imaging scanning device 3 (F≈mg+f). At this time, the heat pipe imaging scanning device 3 slowly slides to the low-level buffer module 23. When the system detects that the heat pipe imaging scanning device 3 has reached the low-level buffer module 23, the heat pipe heat exchanger monitoring power system 4 is powered off, and the remote imaging scanner 33 re-enters the sleep state.

[0049] b) When the heat pipe heat exchanger 1 is in an abnormal state, the coordinates of the abnormal location K are determined. The heat pipe heat exchanger monitoring power system 4 issues a command and adjusts the current A2 to A3. When the heat pipe imaging scanning device 3 is at the abnormal location coordinates K, the heat pipe heat exchanger monitoring power system 4 issues a command and adjusts the current A3 to A4 to ensure that the position of the heat pipe imaging scanning device 3 is fixed, and further imaging scans are performed on the faulty heat pipe heat exchanger 1 to confirm the fault.

[0050] When the host computer 45 determines that a certain heat pipe may be in a low vacuum state, it performs linear positioning on that heat pipe, assuming the position is linear coordinate K. The abnormal heat pipe heat exchanger 1 needs to be imaged and scanned again to prevent system misjudgment. At this time, the host computer 45 issues a command, and the current control device 42 adjusts the current value to A3, so that the magnetic force generated by the induction magnetic coil 5 tends to be close to the weight and friction of the heat pipe imaging scanning device 3 (F≈mg+f). When the heat pipe imaging scanning device 3 slowly slides to the linear coordinate K position, the host computer 45 issues a command, and the current control device 42 readjusts the current value to A4, so that the magnetic force generated by the induction magnetic coil 5 is much greater than the weight of the heat pipe imaging scanning device 3 (F much greater than mg+f). The heat pipe imaging scanning device 3 is attracted to the surface of the induction magnetic coil 5 and fixed by the magnetic force. Figure 1 (as shown in state b), thereby enabling further imaging scanning of the faulty heat pipe heat exchanger 1.

[0051] The working principle of this invention is to achieve the magnetic generation of the induction magnetic coil 5 after current is applied through it, and use the magnetic field force to control the movement of the remote imaging scanner 33 along the imaging scanner track 2; that is, the current control device 42 adjusts the current in the induction magnetic coil 5 to flexibly control the upward movement, downward movement, fixing, and suspension of the heat pipe imaging scanning device 3 on the imaging scanner track 2 beam, as well as the moving speed of the remote imaging scanner 33 in the track beam, thereby completing the accurate imaging scanning of the heat pipe heat exchanger 1 in different areas, completing the real-time monitoring of the vacuum degree of each heat pipe, and realizing unmanned inspection.

[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A vacuum degree detection device for a heat pipe, characterized in that: Includes a heat pipe heat exchanger (1), an imaging scanner track (2), mounted on top of the heat pipe heat exchanger (1), and an induction magnetic coil (5) is installed inside the imaging scanner track (2). A heat pipe imaging scanning device (3) is set on the imaging scanner track (2) and can move to scan the heat pipe heat exchanger (1). The heat pipe heat exchanger monitoring power system (4) is connected to the heat pipe imaging scanning device (3) and controls the heat pipe imaging scanning device (3). The imaging scanner track (2) has the induction magnetic coil (5) arranged horizontally at the top; the bottom of the imaging scanner track (2) is inclined at a certain angle, the angle being 10°~15°; the imaging scanner track (2) has high and low position buffer modules at both ends of the bottom. The bottom of the imaging scanner track (2) is provided with a groove-shaped channel, and the inner limiting surface (21) of the track is symmetrically arranged on both sides of the groove-shaped channel. The heat pipe imaging scanning device (3) includes a positioning module (31), a positioning module axle (32), an insulated magnetic coupling rod (34), and a remote imaging device; the positioning module axle (32) is arranged below the positioning module (31), and the positioning module (31) is connected to the remote imaging scanner (33) through the groove-shaped channel of the imaging scanner track (2) via the insulated magnetic coupling rod (34).

2. The vacuum degree detection device for a heat pipe as described in claim 1, characterized in that: The positioning module (31) is made of magnetic material and has a built-in linear positioning device.

3. The vacuum degree detection device for a heat pipe as described in claim 2, characterized in that: The heat pipe heat exchanger monitoring power system (4) includes a power system and a monitoring and control system.

4. The vacuum degree detection device for a heat pipe as described in claim 3, characterized in that: The power system includes an AC power supply (41), a current control device (42), a power switch (43), and a connecting cable (44); the AC power supply (41) is connected to the current control device (42) and the power switch (43) through the connecting cable (44).

5. The vacuum degree detection device for a heat pipe as described in claim 4, characterized in that: The monitoring and control system includes a host computer (45), which is electrically connected to the current control device (42) and connected to the heat pipe imaging scanning device (3).

6. The vacuum degree detection device for a heat pipe as described in claim 1, characterized in that: The heat pipe heat exchanger monitoring power system (4) is connected to the heat pipe imaging scanning device (3) by electrical connection or wireless connection.

7. A method for detecting the vacuum degree of a heat pipe based on the detection device according to any one of claims 1-6, characterized in that... Includes the following steps: 1) Start the vacuum degree detection device, the current of the induction magnetic coil (5) in the imaging scanner track (2) is turned on, the heat pipe heat exchanger monitoring power system (4) adjusts the current until the heat pipe imaging scanning device (3) is turned on in unattended inspection mode, at which time the current value is A1; 2) The heat pipe heat exchanger monitoring power system (4) increases the current to make the heat pipe imaging scanning device (3) move to the termination position. At this time, the current value is A2; the heat pipe heat exchanger monitoring power system (4) receives the vacuum degree of the heat pipe heat exchanger (1) collected by the heat pipe imaging scanning device (3), judges and analyzes it. a) The heat pipe heat exchanger (1) is in good condition. The heat pipe heat exchanger monitoring power system (4) adjusts the current A2 to A3. The heat pipe imaging scanning device (3) returns to the initial position. The heat pipe heat exchanger monitoring power system (4) is powered off. The heat pipe imaging scanning device (3) re-enters the sleep state and completes the detection. b) When the heat pipe heat exchanger (1) is in an abnormal state, the coordinates of the abnormal position K are determined. The heat pipe heat exchanger monitoring power system (4) issues an instruction and adjusts the current A2 to A3. When the heat pipe imaging scanning device (3) is at the abnormal position coordinates K, the heat pipe heat exchanger monitoring power system (4) issues an instruction and adjusts the current A3 to A4 to ensure that the position of the heat pipe imaging scanning device (3) is fixed, and further imaging scans are performed on the faulty heat pipe heat exchanger (1) to confirm the fault.

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