An infrared imaging device suitable for air preheater cold end wall temperature monitoring and mounting structure thereof

Abstract

This utility model discloses an infrared imaging device and its installation structure suitable for monitoring the cold end wall temperature of an air preheater. The imaging device includes a protective housing, an infrared imaging module, an isolation lens flange, a mounting flange, a dustproof air curtain, and a compressed gas delivery pipe. The protective housing is cylindrical. The infrared imaging module is installed inside the head end of the protective housing, the isolation lens flange is installed at the head end of the protective housing, and the mounting flange is connected to the tail end of the protective housing. The isolation lens flange has a through hole. The dustproof air curtain is installed on the isolation lens flange and has an annular cavity structure. The dustproof air curtain has an air inlet on its side wall and an annular air outlet on its inner ring side wall. The mounting flange has a compressed air interface. One end of the compressed gas delivery pipe is connected to the air inlet on the dustproof air curtain, and the other end is connected to the compressed air interface on the mounting flange. The above device can monitor the cold end wall temperature of the air preheater in real time, and is sensitive, accurate, stable, and has a long service life.

Description

Technical Field

[0001] This utility model relates to an infrared imaging device and its installation structure suitable for monitoring the cold end wall temperature of an air preheater, belonging to the technical field of cold end wall temperature monitoring for rotary air preheaters. Background Technology

[0002] A rotary air preheater (referred to as a "preheater") is a heat exchange device used in large power plant boilers. It utilizes the heat from boiler flue gas to heat the air needed for combustion, thereby improving boiler efficiency. Key issues concerning preheaters include ash blockage, high air leakage rate, low heat transfer efficiency, and severe low-temperature corrosion. These problems have long affected the safe and economical operation of the equipment. These issues are long-standing and mutually reinforcing. In recent years, with the widespread operation of denitrification systems, the operating environment of preheaters has changed, making the aforementioned ash blockage problem particularly prominent, difficult, and complex to manage.

[0003] Currently, the flue gas denitrification facilities added to coal-fired power plants mainly use selective catalytic reduction (SCR) technology. After adopting the SCR denitrification process, some of the SO2 in the flue gas will be oxidized to SO3 by the denitrification catalyst, increasing the volume concentration of SO3 in the flue gas. In addition, there is an unavoidable ammonia escape phenomenon, which leads to the large-scale generation of by-products such as ammonium bisulfate (NH4HSO4), and also increases the acid dew point temperature of the flue gas, resulting in intensified low-temperature corrosion.

[0004] The aforementioned byproduct, ammonium bisulfate (NH4HSO4), is molten in the temperature range of 146~207 ℃ and adheres firmly to the surface of the heat storage elements in the air preheater, causing corrosion and ash accumulation. This can easily lead to ash blockage, posing a significant threat to the safe operation of the unit. Therefore, real-time monitoring of the ash blockage on the surface of the air preheater's heat storage elements, and dynamic adjustment of the overall cold-end temperature of the air preheater, is crucial for the safe and efficient operation of rotary air preheaters. Summary of the Invention

[0005] This invention provides an infrared imaging device and its installation structure suitable for monitoring the cold end wall temperature of an air preheater. It can monitor the cold end wall temperature of the air preheater in real time and use the monitoring results as a basis for dynamically adjusting the overall temperature of the cold end of the air preheater. This is of great significance for the safe and efficient operation of rotary air preheaters.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An infrared imaging device suitable for monitoring the cold end wall temperature of an air preheater includes a protective housing, an infrared imaging module, an isolation lens flange, a mounting flange, a dustproof air curtain, and a compressed gas delivery pipe. The protective housing is a cylindrical structure (one end is the head end and the other end is the tail end); the infrared imaging module is installed inside the head end of the protective housing, the isolation lens flange is installed at the head end of the protective housing, and the mounting flange is connected to the tail end of the protective housing. The isolation lens flange has through holes to facilitate imaging by the infrared imaging module; the dustproof air curtain is installed on the isolation lens flange. The dustproof air curtain has an annular cavity structure. The side wall of the dustproof air curtain has an air inlet, and the inner ring side wall of the dustproof air curtain has an annular air outlet opened along the perimeter. The mounting flange is equipped with a compressed air interface. One end of the compressed gas delivery pipe is connected to the air inlet on the dustproof air curtain, and the other end is connected to the compressed air interface on the mounting flange.

[0007] The infrared imaging device described above, which is suitable for monitoring the cold end wall temperature of air preheaters, adopts a detachable structure, making it easy to disassemble, install, and maintain.

[0008] The infrared imaging device described above, suitable for monitoring the cold end wall temperature of the air preheater, can monitor the cold end wall temperature of the air preheater in real time through the infrared imaging module. The protective shell, the isolation lens flange, and the dustproof air curtain work together to effectively protect the infrared imaging module, ensuring the sensitivity, accuracy, and stability of temperature monitoring.

[0009] During operation, compressed air is connected to the compressed air interface on the flange, passes through the compressed gas delivery pipe, enters the dustproof air curtain, and is then sprayed out from the annular air outlet, forming a uniform annular airflow that effectively protects the infrared imaging module.

[0010] The aforementioned infrared imaging modules can be directly purchased from existing commercially available products.

[0011] The through-hole on the isolation lens flange and the annular dust curtain (with a through-hole in the center) are designed to avoid affecting the imaging of the infrared imaging module. In other words, the isolation lens flange and dust curtain effectively protect the infrared imaging module without affecting its imaging optical path.

[0012] As is common knowledge, a ring consists of an inner ring and an outer ring.

[0013] To reduce size and facilitate installation and use, the air inlet on the dustproof air curtain is located on the side facing the mounting flange and is positioned opposite the compressed air interface on the mounting flange.

[0014] In one preferred embodiment, the dust curtain has two air inlets, two compressed air interfaces on the mounting flange, and two compressed gas delivery pipes, all in a one-to-one correspondence. The two ends of each compressed gas delivery pipe are connected to the corresponding air inlet on the dust curtain and the compressed air interface on the mounting flange, respectively. The two compressed gas delivery pipes are symmetrically arranged on both sides of the protective housing. This improves the uniformity of the annular airflow from the annular outlet and ensures the balance of forces on the device, thus enhancing its operational stability.

[0015] For ease of assembly and disassembly, both the head and tail ends of the protective housing are equipped with connecting flanges. The isolation lens flange is installed on the connecting flange at the head end of the protective housing, and the mounting flange is connected to the connecting flange at the tail end of the protective housing. The outer diameter of the connecting flange is smaller than the outer diameter of the mounting flange. The mounting flange on the periphery of the connecting flange is equipped with mounting holes for the overall installation of the device.

[0016] To facilitate the installation and positioning of compressed gas delivery pipes, symmetrically arranged C-shaped notches are provided on the connecting flanges at both ends of the isolation lens flange and the protective housing. This allows two compressed gas delivery pipes to be fitted into the C-shaped notches on both sides, facilitating the quick installation and positioning of the two compressed gas delivery pipes.

[0017] To facilitate electrical connections, an electrical interface is also provided on the mounting flange for electrical connections to the infrared imaging module. The electrical connections of the infrared imaging module in this application utilize existing mature technologies or can be found in product specifications; this application does not offer any significant improvements in this regard, and therefore will not elaborate further.

[0018] The aforementioned infrared imaging module integrates optical components, an infrared detector, and a signal processing module. It should be noted that this application does not make any special improvements to the individual components of the infrared imaging module or the connection methods between them; therefore, these will not be elaborated upon further. Existing commercially available products can be directly used, and operation should be performed according to the instruction manual. The preferred infrared imaging module model in this application is M384F, brand: Gewu Youxin. This module integrates optical components, an infrared detector, and a signal processing module.

[0019] To further improve the sealing performance of the device, there are sealing rings between the protective housing and the isolation lens flange and the mounting flange, which can isolate dust and moisture.

[0020] To further ensure protection for the infrared imaging module, embedded infrared optical lenses are integrated into the through-holes of the isolation lens flange. This ensures both effective infrared detection and imaging, while also providing better protection for the infrared imaging module.

[0021] As one preferred implementation, the infrared optical lens is made of silicon.

[0022] The above-mentioned installation structure for the infrared imaging device suitable for monitoring the cold end wall temperature of the air preheater involves welding a fixed anti-flange onto the cold end duct wall of the air preheater. The infrared imaging device suitable for monitoring the cold end wall temperature of the air preheater is installed on the fixed anti-flange via an installation flange.

[0023] Existing data transmission communication technologies can be used to transmit the infrared imaging data of the above-mentioned device to a remote host computer.

[0024] Any technologies not mentioned in this utility model are based on existing technologies.

[0025] This invention relates to an infrared imaging device for monitoring the cold end wall temperature of an air preheater. It enables real-time monitoring of the cold end wall temperature and provides the monitoring results as a basis for dynamically adjusting the overall cold end temperature of the air preheater. This is of great significance for the safe and efficient operation of rotary air preheaters. Furthermore, it features a simple structure, is easy to disassemble and maintain, and allows for partial replacement in case of damage. Through the coordinated use of a protective shell, isolation lens flange, and dustproof air curtain, the infrared imaging module is effectively protected, ensuring its monitoring sensitivity, accuracy, and stability, and extending the device's service life. Attached Figure Description

[0026] Figure 1 This is a front view structural diagram of an infrared imaging device for monitoring the cold end wall temperature of an air preheater according to the present invention.

[0027] Figure 2 This is an exploded axial view of an infrared imaging device for monitoring the cold end wall temperature of an air preheater according to this utility model.

[0028] Figure 3 This is a left-side structural view of an infrared imaging device for monitoring the cold end wall temperature of an air preheater according to this utility model.

[0029] Figure 4 This is a perspective view of an infrared imaging device for monitoring the cold end wall temperature of an air preheater according to the present invention.

[0030] In the diagram, 1 is the infrared imaging module, 2 is the protective housing, 3 is the isolation lens flange, 31 is the C-shaped notch, 4 is the mounting flange, 41 is the compressed air interface, 42 is the electrical interface, 5 is the dustproof air curtain, 51 is the air inlet, 52 is the annular air outlet, and 6 is the compressed gas delivery pipe. Detailed Implementation

[0031] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0032] The directional terms used in this application, such as "center," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are based on the orientation or positional relationship shown in the accompanying drawings or in the usage state, and are only for the convenience of describing this application. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Example 1

[0033] like Figure 1-4 As shown, an infrared imaging device suitable for monitoring the cold end wall temperature of an air preheater includes a protective housing, an infrared imaging module, an isolation lens flange, a mounting flange, a dustproof air curtain, and a compressed gas delivery pipe. The protective housing is a cylindrical structure (one end is the head end and the other end is the tail end); the infrared imaging module is installed inside the head end of the protective housing, the isolation lens flange is installed at the head end of the protective housing, and the mounting flange is connected to the tail end of the protective housing. The isolation lens flange has through holes to facilitate imaging by the infrared imaging module; the dustproof air curtain is installed on the isolation lens flange. The dustproof air curtain has an annular cavity structure. The side wall of the dustproof air curtain has an air inlet, and the inner ring side wall of the dustproof air curtain has an annular air outlet opened along the perimeter. The mounting flange is equipped with a compressed air interface. One end of the compressed gas delivery pipe is connected to the air inlet on the dustproof air curtain, and the other end is connected to the compressed air interface on the mounting flange.

[0034] The aforementioned infrared imaging device, suitable for monitoring the cold-end wall temperature of an air preheater, allows for real-time monitoring of the cold-end wall temperature. The protective housing, isolation lens flange, and dustproof air curtain effectively protect the infrared imaging module, ensuring the sensitivity, accuracy, and stability of temperature monitoring. During operation, compressed air is introduced through the compressed air interface on the flange, passes through the compressed gas delivery pipe, enters the dustproof air curtain, and is then ejected from the annular outlet, forming a uniform annular airflow that effectively protects the infrared imaging module. Example 2

[0035] Based on Example 1, the following improvements were made: In order to reduce the size and facilitate installation and use, the air inlet on the dustproof air curtain is located on the side facing the mounting flange and is positioned opposite to the compressed air interface on the mounting flange. Example 3

[0036] Based on Example 2, the following improvements were made: Figure 1As shown, the dust curtain has two air inlets, two compressed air interfaces on the mounting flange, and two compressed gas delivery pipes, all of which correspond one-to-one. The two ends of each compressed gas delivery pipe are connected to the corresponding air inlet on the dust curtain and the compressed air interface on the mounting flange, respectively. The two compressed gas delivery pipes are symmetrically arranged on both sides of the protective housing. This design improves the uniformity of the annular airflow from the annular outlet and ensures the balance of forces on the device, thus enhancing its operational stability. Example 4

[0037] Based on Example 3, the following improvements were further made: Figure 1 As shown, for easy disassembly and assembly, both the head end and the tail end of the protective housing are provided with connecting flanges. The isolation lens flange is installed on the connecting flange at the head end of the protective housing, and the mounting flange is connected to the connecting flange at the tail end of the protective housing. The outer diameter of the connecting flange is smaller than the outer diameter of the mounting flange. The mounting flange on the periphery of the connecting flange is provided with mounting holes for the overall installation of the device. Example 5

[0038] Based on Example 4, the following improvements were made: Figure 2 As shown, in order to facilitate the installation and positioning of the compressed gas delivery pipes, symmetrically arranged C-shaped notches are provided on the connecting flanges at both ends of the isolation lens flange and the protective housing. This allows the two compressed gas delivery pipes to be fitted into the C-shaped notches on both sides, facilitating the quick installation and positioning of the two compressed gas delivery pipes. Example 6

[0039] Based on Example 5, the following improvements were further made: Figure 1 As shown, an electrical interface is also provided on the mounting flange for easy electrical connection. This interface is used for the electrical connection of the infrared imaging module. In this example, an infrared imaging module of model M384F (brand: Gewu Youxin) is used, which integrates optical components, an infrared detector, and a signal processing module. Example 7

[0040] Based on Example 6, the following improvements were made: In order to further improve the sealing performance of the device, there are sealing rings between the protective housing and the isolation lens flange and the mounting flange, which can isolate dust and moisture. Example 8

[0041] Based on Example 7, the following improvements were further made: Figure 1 As shown, to further ensure protection for the infrared imaging module, an embedded infrared optical lens is integrated into the through-hole of the isolation lens flange. This ensures both infrared detection and imaging performance while providing better protection for the infrared imaging module. In this example, the infrared optical lens is made of silicon.

[0042] The aforementioned installation structure for the infrared imaging device suitable for monitoring the cold end wall temperature of an air preheater involves welding a fixed anti-flange to the cold end duct wall of the air preheater. The infrared imaging device is then mounted on the fixed anti-flange via the mounting flange. Existing data transmission communication technology can be used to transmit the infrared imaging data from the device to a remote host computer.

[0043] The infrared imaging devices described above, suitable for monitoring the cold-end wall temperature of air preheaters, can monitor the cold-end wall temperature of air preheaters in real time. The monitoring results can be used as a basis for dynamically adjusting the overall cold-end temperature of the air preheater, which is of great significance for the safe and efficient operation of rotary air preheaters. Furthermore, they have a simple structure, are easy to disassemble and maintain, and can be replaced locally if damaged. Through the coordinated use of the protective shell, isolation lens flange, and dustproof air curtain, the infrared imaging module can be effectively protected, ensuring its monitoring sensitivity, accuracy, and stability, and extending the service life of the device.

Claims

1. An infrared imaging device suitable for air preheater cold end wall temperature monitoring, characterized in that: Includes a protective housing, an infrared imaging module, an isolation lens flange, a mounting flange, a dustproof air curtain, and a compressed gas delivery pipe; The protective housing is a cylindrical structure; the infrared imaging module is installed inside the head end of the protective housing, the isolation lens flange is installed at the head end of the protective housing, and the mounting flange is connected to the tail end of the protective housing. The isolation lens flange has through holes; the dustproof air curtain is installed on the isolation lens flange. The dustproof air curtain has an annular cavity structure. The side wall of the dustproof air curtain has an air inlet, and the inner ring side wall of the dustproof air curtain has an annular air outlet opened along the perimeter. The mounting flange is equipped with a compressed air interface. One end of the compressed gas delivery pipe is connected to the air inlet on the dustproof air curtain, and the other end is connected to the compressed air interface on the mounting flange.

2. The infrared imaging device suitable for cold end wall temperature monitoring of an air preheater according to claim 1, characterized in that: The air inlet on the dustproof air curtain is located on the side facing the mounting flange and is positioned opposite the compressed air interface on the mounting flange.

3. The infrared imaging device for cold end wall temperature monitoring of an air preheater according to claim 1 or 2, characterized in that: The dustproof air curtain has two air inlets, two compressed air interfaces on the mounting flange, and two compressed gas delivery pipes, and each of the three corresponds to the other. The two ends of the compressed gas delivery pipe are connected to the corresponding air inlets on the dustproof air curtain and the compressed air interfaces on the mounting flange, respectively. The two compressed gas delivery pipes are symmetrically arranged on both sides of the protective shell.

4. The infrared imaging device for cold end wall temperature monitoring of an air preheater according to claim 1 or 2, characterized in that: Both the head and tail ends of the protective housing are equipped with connecting flanges. The isolation lens flange is installed on the connecting flange at the head end of the protective housing, and the mounting flange is connected to the connecting flange at the tail end of the protective housing. The outer diameter of the connecting flange is smaller than the outer diameter of the mounting flange, and the mounting flange on the periphery of the connecting flange is equipped with mounting holes.

5. The infrared imaging device suitable for cold end wall temperature monitoring of an air preheater as claimed in claim 3, wherein: The connecting flanges at both ends of the isolation lens flange and the protective housing are provided with symmetrically arranged C-shaped notches, and the compressed gas delivery pipe is fitted into the C-shaped notch on its respective side.

6. The infrared imaging device for cold end wall temperature monitoring of an air preheater according to claim 1 or 2, characterized in that: The mounting flange is also equipped with an electrical interface, which is used for the electrical connection of the infrared imaging module.

7. The infrared imaging device for cold end wall temperature monitoring of an air preheater according to claim 1 or 2, characterized in that: The infrared imaging module integrates optical components, an infrared detector, and a signal processing module; there are sealing rings between the protective housing and the isolation lens flange and the mounting flange.

8. The infrared imaging device suitable for cold end wall temperature monitoring of an air preheater according to claim 1 or 2, characterized in that: An embedded infrared optical lens is integrated into the through hole of the isolation lens flange.

9. The infrared imaging device suitable for cold end wall temperature monitoring of an air preheater according to claim 8, characterized in that: The infrared optical lens is made of silicon.

10. The mounting structure for the infrared imaging device for monitoring the cold end wall temperature of the air preheater according to any one of claims 1 to 9, characterized in that: A fixed anti-flange is welded onto the wall of the cold end air duct of the air preheater. An infrared imaging device suitable for monitoring the wall temperature of the cold end of the air preheater is installed on the fixed anti-flange via a mounting flange.

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