A leakage position monitoring mechanism for a low-temperature economizer

Abstract

The utility model provides a leakage position monitoring mechanism for a low-temperature economizer, belonging to the technical field of economizers. It solves the problem that leakage of existing pipe rows is not easy to be discovered and it is difficult to accurately determine the leakage position. The leakage position monitoring mechanism of the low-temperature economizer includes an economizer body, the economizer body includes a first pipe row near the flue gas inlet, the first pipe row includes a plurality of heat exchange tubes arranged side by side, a group of humidity sensor components is arranged between two adjacent heat exchange tubes, each group of humidity sensor components includes a plurality of humidity sensor components, all humidity sensor components are arranged at intervals along the length direction of the heat exchange tube, and the humidity sensor components in two adjacent groups of humidity sensor components are staggered front and back. This structure makes it convenient for maintenance personnel to quickly lock the accurate leakage position, facilitates subsequent pipe row maintenance and provides greater convenience for pipe plugging work.

Description

Technical Field

[0001] The utility model belongs to the technical field of economizers, in particular to a leakage position monitoring mechanism for a low-temperature economizer. Background Art

[0002] Low-temperature economizer is a device that can effectively save coal and improve boiler efficiency in the low-temperature section. It is mainly used in the medium and low-temperature sections of the air preheater outlet of large boilers in power plants, thermal power plants, etc. It can effectively reduce the exhaust gas thermal efficiency by recovering the flue gas waste heat to heat the boiler feed water. Low-temperature economizer is usually installed in the tail flue at the outlet of the boiler air preheater. It can not only improve the efficiency of electrostatic precipitator and meet low emission requirements, but also reduce power consumption and reduce the specifications of downstream equipment. At the same time, it can remove most of the acid gases.

[0003] At present, most low-temperature economizers are installed in the flue before the dust collector. The high ash environment before the dust collector determines that the low-temperature economizer is bound to have the risk of wear and leakage, especially the first row of heat exchange tubes in the tube row directly corresponds to the flue gas inlet. This row of heat exchange tubes first contacts the flue gas. The dust in the flue gas directly impacts on this row of heat exchange tubes, making this row of heat exchange tubes easy to wear and cause local leakage. When the heat exchange tube leaks, the leaking part is not easy to be found because the aperture of the leaking part is generally small. Even if the heat exchange tube is found to have a leak, it is difficult to find the exact leaking location, making the maintenance of the heat exchange tube extremely inconvenient. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and propose a leakage position monitoring mechanism for a low-temperature economizer. The technical problem to be solved by the utility model is: how to solve the problem that pipe row leakage is difficult to be found and the leakage position is difficult to be accurately determined.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A leakage position monitoring mechanism for a low-temperature economizer comprises an economizer body, wherein the economizer body comprises a first tube row near a flue gas inlet, wherein the first tube row comprises a plurality of heat exchange tubes arranged side by side, and wherein a group of humidity sensor assemblies is arranged between two adjacent heat exchange tubes, wherein each group of humidity sensor assemblies comprises a plurality of humidity sensor assemblies, and all humidity sensor assemblies are arranged at intervals along the length direction of the heat exchange tube, and the humidity sensor assemblies in two adjacent groups of humidity sensor assemblies are staggered front to back.

[0007] In the present structure, humidity sensor assemblies are arranged between two adjacent heat exchange tubes along the axial intervals of the heat exchange tubes. Each humidity sensor assembly can monitor the humidity changes in a certain area around it. Since the humidity sensor assemblies in the two adjacent groups of humidity sensor groups are staggered front and back, each monitoring area is triangular. During operation, the humidity value fluctuations of each humidity sensor are monitored through the background. When the humidity difference of the three humidity sensors in a triangular area fluctuates significantly, it means that there is a leakage problem in the triangular area, which is convenient for maintenance personnel to quickly lock the accurate leakage location, facilitate subsequent pipe row maintenance and provide greater convenience for pipe plugging work.

[0008] In the above-mentioned leakage position monitoring mechanism of a low-temperature economizer, the heat exchange tube is provided with a plurality of heat dissipation fins, and all the heat dissipation fins are arranged at intervals along the length direction of the heat exchange tube. The humidity sensor assembly includes a mounting seat and a humidity sensor arranged on the mounting seat. The mounting seat is arranged between two adjacent heat exchange tubes. The front and rear sides of the mounting seat are provided with clamping plates, and the two clamping plates are clamped at the ends of four heat dissipation fins. This structure uses heat dissipation fins to position the mounting seat between the two heat exchange tubes. The thickness of the heat dissipation fins is relatively thin, and the ends are easily deformed. This structure is designed so that the distance between the two clamping plates is slightly smaller than the spacing between two adjacent heat dissipation fins. After the two clamping plates are clamped on the ends of the four heat dissipation fins, the ends of the heat dissipation fins are slightly deformed, ensuring that the heat dissipation fins and the two clamping plate brackets form a tight fit, realizing the positioning of the mounting seat, and then facilitating the humidity sensor to be arranged between the two heat exchange tubes.

[0009] In the above-mentioned leakage position monitoring mechanism of a low-temperature economizer, the inner edge of the lower end of the clamping plate has a straight chamfer. The straight chamfer enables the mounting seat to play a guiding role during the installation on the heat dissipation fins, ensuring that the mounting seat can smoothly clamp the ends of the four heat dissipation fins.

[0010] In the above-mentioned leakage position monitoring mechanism for a low-temperature economizer, the middle part of the mounting seat has a mounting sleeve formed by a downward protrusion, the inner wall of the mounting sleeve is provided with an internal thread, and the humidity sensor is threadedly connected to the mounting sleeve. The provision of the mounting sleeve facilitates the threaded connection between the humidity sensor and the mounting sleeve, and facilitates the installation of the humidity sensor on the mounting seat.

[0011] In the above-mentioned leakage position monitoring mechanism of a low-temperature economizer, a through hole is provided in the middle of the clamping plate, and a connecting portion is provided at the positions corresponding to the two through holes on the outer circumference of the mounting sleeve, and a threaded hole is provided on the connecting portion, and the threaded hole is coaxially arranged with the through hole, and a hexagon socket bolt is passed through the through hole, and the hexagon socket bolt is connected to the threaded hole, and the head of the hexagon socket bolt can be pressed against the outer wall of the clamping plate. When the mounting seat clamps the ends of the four heat dissipating fins, the mounting seat is pre-positioned, and then the hexagon socket bolt is rotated, so that the hexagon socket bolt gradually presses the clamping plate, thereby causing the clamping plate to be slightly deformed, so that the clamping plate further clamps the ends of the four heat dissipating fins, and the installation stability of the mounting seat is improved.

[0012] Compared with the prior art, the leakage position monitoring mechanism of the low-temperature economizer of the utility model has the following advantages: in this structure, a humidity sensor assembly is arranged between two adjacent heat exchange tubes along the axial interval of the heat exchange tube, and each humidity sensor assembly can monitor the humidity change in a certain area around it. Since the humidity sensor assemblies in the two adjacent groups of humidity sensor groups are staggered front and back, each monitoring area is triangular, and the humidity value fluctuation of each humidity sensor is monitored through the background during operation. When the humidity difference of the three humidity sensors in a triangular area fluctuates significantly, it means that there is a leakage problem in the triangular area, which is convenient for maintenance personnel to quickly lock the accurate leakage position, facilitate subsequent pipe row maintenance and provide greater convenience for pipe plugging work. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0014] Figure 2 It is a top view of the utility model.

[0015] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the humidity sensor assembly of the utility model.

[0017] Figure 5 It is a schematic diagram of the cross-sectional structure of the humidity sensor assembly of the utility model.

[0018] In the figure, 1. economizer body; 2. first tube row; 20. heat exchange tube; 21. heat dissipation fin; 3. humidity sensor assembly group; 4. humidity sensor assembly; 40. mounting seat; 41. humidity sensor; 42. straight chamfer; 43. mounting sleeve; 44. clamping plate; 45. through hole; 46. connecting part; 47. threaded hole; 48. hexagon socket bolt. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1 and Figure 2 As shown, the leakage position monitoring mechanism of the low-temperature economizer includes an economizer body 1, the economizer body 1 includes a first tube row 2 near the flue gas inlet, the first tube row 2 includes a plurality of heat exchange tubes 20 arranged side by side, a group of humidity sensor components 3 is arranged between two adjacent heat exchange tubes 20, each group of humidity sensor components 3 includes a plurality of humidity sensor components 4, all humidity sensor components 4 are arranged at intervals along the length direction of the heat exchange tube 20, and the humidity sensor components 4 in two adjacent groups of humidity sensor components 3 are arranged staggered front and back. Humidity sensor components 4 are arranged at intervals along the axial direction of the heat exchange tube 20 between two adjacent heat exchange tubes 20, and each humidity sensor component 4 can monitor the humidity changes in a certain area around it, such as Figure 2 As shown, since the humidity sensor assemblies 4 in the two adjacent humidity sensor groups 3 are staggered front and back, each monitoring area is triangular, and several triangular areas can basically cover all parts of the heat exchange tube 20. During operation, the humidity value fluctuation of each humidity sensor is monitored by the background. When the humidity difference of the three humidity sensors in a triangular area fluctuates significantly, it means that there is a leakage problem in the triangular area, which is convenient for maintenance personnel to quickly lock the accurate leakage position, facilitate subsequent pipe row maintenance and provide greater convenience for pipe plugging work.

[0021] like Figure 3 , Figure 4 and Figure 5 As shown, the heat exchange tube 20 is provided with a plurality of heat dissipating fins 21, and all the heat dissipating fins 21 are arranged at intervals along the length direction of the heat exchange tube 20. The humidity sensor assembly 4 includes a mounting seat 40 and a humidity sensor 41 arranged on the mounting seat 40. The mounting seat 40 is arranged between two adjacent heat exchange tubes 20. The front and rear sides of the mounting seat 40 are provided with clamping plates 44. The two clamping plates 44 are clamped on the ends of the four heat dissipating fins 21, and the inner edge of the lower end of the clamping plate 44 has a straight chamfer 42. This structure uses the heat dissipation fins 21 to position the mounting base between the two heat exchange tubes 20. The heat dissipation fins 21 are relatively thin and the ends are easily deformed. This structure is designed so that the distance between the two clamps 44 is slightly smaller than the spacing between two adjacent heat dissipation fins 21. After the two clamps 44 are clamped on the ends of the four heat dissipation fins 21, the ends of the heat dissipation fins 21 are slightly deformed, ensuring that the heat dissipation fins 21 form a tight fit with the two clamps 44 brackets, thereby achieving the positioning of the mounting base 40, and making it convenient to set the humidity sensor 41 between the two heat exchange tubes 20.

[0022] like Figure 4 and Figure 5 As shown, the middle part of the mounting seat 40 has a mounting sleeve 43 formed by a downward protrusion, and the inner wall of the mounting sleeve 43 is provided with an internal thread, and the humidity sensor 41 is threadedly connected to the mounting sleeve 43. A through hole 45 is provided in the middle part of the clamping plate 44, and the outer circumference of the mounting sleeve 43 is provided with a connecting portion 46 at the position corresponding to the two through holes 45, and a threaded hole 47 is provided on the connecting portion 46, and the threaded hole 47 is coaxially arranged with the through hole 45. A hexagon socket bolt 48 is passed through the through hole 45, and the hexagon socket bolt 48 is connected with the threaded hole 47, and the head of the hexagon socket bolt 48 can be pressed against the outer wall of the clamping plate 44. When the mounting seat 40 clamps the ends of the four heat dissipation fins 21, the pre-positioning of the mounting seat 40 is realized, and then the hexagon socket bolt 48 is rotated, so that the hexagon socket bolt 48 gradually presses the clamping plate 44, thereby causing the clamping plate 44 to be slightly deformed, so that the clamping plate 44 further clamps the ends of the four heat dissipation fins 21, and improves the installation stability of the mounting seat 40.

[0023] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A leakage position monitoring mechanism for a low-temperature economizer, comprising an economizer body (1), wherein the economizer body (1) comprises a first tube row (2) near a flue gas inlet, wherein the first tube row (2) comprises a plurality of heat exchange tubes (20) arranged side by side, characterized in that: A group of humidity sensor components (3) is arranged between two adjacent heat exchange tubes (20), each group of humidity sensor components (3) comprises a plurality of humidity sensor components (4), all humidity sensor components (4) are arranged at intervals along the length direction of the heat exchange tube (20), and the humidity sensor components (4) in two adjacent groups of humidity sensor components (3) are arranged in a staggered manner in front and back.

2. A leakage position monitoring mechanism for a low-temperature economizer according to claim 1, characterized in that: The heat exchange tube (20) is provided with a plurality of heat dissipation fins (21), and all the heat dissipation fins (21) are arranged at intervals along the length direction of the heat exchange tube (20). The humidity sensor assembly (4) comprises a mounting seat (40) and a humidity sensor (41) arranged on the mounting seat (40). The mounting seat (40) is arranged between two adjacent heat exchange tubes (20). The front and rear sides of the mounting seat (40) are provided with clamping plates (44), and the two clamping plates (44) are clamped on the ends of the four heat dissipation fins (21).

3. A leakage position monitoring mechanism for a low-temperature economizer according to claim 2, characterized in that: The inner edge of the lower end of the clamping plate (44) has a straight chamfer (42).

4. A leakage position monitoring mechanism for a low-temperature economizer according to claim 2, characterized in that: The middle part of the mounting seat (40) is provided with a mounting sleeve (43) which is protruded downwards, and the inner wall of the mounting sleeve (43) is provided with an internal thread, and the humidity sensor (41) is threadedly connected to the mounting sleeve (43).

5. A low-temperature economizer leakage position monitoring mechanism according to claim 4, characterized in that: A through hole (45) is provided in the middle of the clamping plate (44), and connecting parts (46) are provided on the outer circumference of the mounting sleeve (43) at positions corresponding to the two through holes (45). A threaded hole (47) is provided on the connecting part (46), and the threaded hole (47) is coaxially arranged with the through hole (45). A hexagon socket bolt (48) is passed through the through hole (45), and the hexagon socket bolt (48) is connected to the threaded hole (47). The head of the hexagon socket bolt (48) can be pressed against the outer wall of the clamping plate (44).

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