Air preheater and gap measuring device therefor

Abstract

The utility model discloses an air preheater and gap measuring device thereof relates to air preheater technical field, wherein, the gap measuring device of this air preheater includes sleeve and measurement component, sleeve is used for installing on the sector plate, and the sleeve is provided with installation cavity in, and the both ends of sleeve along its extension direction are detection end and mounting end respectively, and the detection end forms and has the detection port, and the side of sleeve is provided with the air inlet for the cooling wind to enter, and the air inlet and detection port all are linked with installation cavity, measurement component includes mounting structure and distance sensor, and mounting structure sets up at mounting end place, and distance sensor is movably installed at mounting end, and the inductive end of distance sensor stretches into installation cavity and sets up towards detection end, and detection end is used for measuring the distance between detection end and preheater body, to measure the size of gap. The gap measuring device of air preheater provided by the utility model can adapt to the working environment of high temperature, and has higher measuring accuracy.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, and in particular to an air preheater and its gap measuring device. Background Technology

[0002] The air preheater is a crucial component of a boiler. It utilizes the temperature of the flue gas at the boiler's tail end to heat the combustion air, effectively reducing the exhaust gas temperature and improving the boiler's thermal efficiency. Since most grid-connected generator sets currently use rotary air preheaters, a gap exists between the preheater's fan-shaped plates and the preheater body to allow air and flue gas to flow. Currently, the size of this gap is typically adjusted by changing the distance between the fan-shaped plates and the preheater body to improve the efficiency of heat exchange between air and flue gas. Therefore, to achieve optimal heat exchange efficiency, precise control of the gap size is necessary, requiring a gap measuring device to measure the distance between the fan-shaped plates and the preheater body. However, current gap measuring devices are ill-suited for high-temperature operating environments and suffer from poor measurement accuracy. Utility Model Content

[0003] The main purpose of this invention is to propose an air preheater and its gap measuring device, which aims to solve the technical problems that gap measuring devices are difficult to adapt to high-temperature working environments and have poor measurement accuracy.

[0004] To achieve the above objectives, this utility model proposes a gap measuring device for an air preheater. The air preheater includes a sector plate and a preheater body, with a gap formed between the preheater body and the sector plate. The gap measuring device includes: The sleeve is used to install on the sector plate. The sleeve has an installation cavity. The two ends of the sleeve along its extension direction are the detection end and the installation end, respectively. The detection end forms a detection port. An air inlet for cooling air is opened on one side of the sleeve. Both the air inlet and the detection port are connected to the installation cavity. The measuring component includes a mounting structure and a distance sensor. The mounting structure is located at the mounting end, and the distance sensor is movably mounted at the mounting end. The sensing end of the distance sensor extends into the mounting cavity and faces the detection end. The distance sensor can move relative to the mounting structure along the extension direction of the sleeve to move the sensing end closer to or away from the detection end. The detection end is used to measure the gap size.

[0005] In one embodiment, an installation port communicating with the installation cavity is formed at the installation end of the sleeve. The installation structure includes a mounting base, which is installed at the installation port and seals the installation port. The distance sensor is aligned with the extension direction of the sleeve, and the two ends of the distance sensor along its extension direction are an assembly end and a sensing end, respectively. The assembly end is movably inserted through the mounting base and partially extends out of the installation port, and the distance sensor can move relative to the mounting base along the extension direction of the sleeve.

[0006] In one embodiment, the mounting base has a threaded hole communicating with the mounting cavity, and the outer periphery of the assembly end has a first threaded section. The first threaded section is threadedly engaged with the threaded hole so that by screwing the assembly end, the distance sensor can be moved relative to the mounting base along the extension direction of the sleeve.

[0007] In one embodiment, a nut is fitted onto the portion of the assembly end located outside the threaded hole. The nut is threadedly engaged with the first threaded segment and abuts against the side of the mounting base away from the detection port.

[0008] In one embodiment, the mounting base is detachably sealed to the mounting opening.

[0009] In one embodiment, a second threaded segment is formed on the outside of the mounting base, and a third threaded segment is formed at the position where the mounting opening is formed on the cavity wall of the mounting cavity, and the second threaded segment and the third threaded segment are threadedly engaged.

[0010] In one embodiment, the mounting base includes an abutment portion and an insertion portion. The insertion portion is connected to the end of the abutment portion facing the sleeve and forms a mounting step between the insertion portion and the abutment portion. A second threaded section is formed on the outer periphery of the insertion portion. The insertion portion passes through the mounting opening and is inserted into the mounting cavity. The abutment portion is located outside the mounting cavity, and the mounting step abuts against the mounting end.

[0011] In one embodiment, the distance sensor is an eddy current sensor.

[0012] This utility model also proposes an air preheater, which includes a preheater body and a sector plate. A gap is formed between the sector plate and the preheater body. The sector plate can move towards or away from the preheater body to adjust the size of the gap. A gap measuring device as described above is installed on the sector plate. The detection end of the gap measuring device is set close to the preheater body and is used to measure the size of the gap.

[0013] In one embodiment, the air preheater includes a plurality of sector plates, with a gap between each sector plate and the preheater body, and a plurality of gap measuring devices are spaced apart on each sector plate.

[0014] The technical solution of this utility model involves setting a sleeve on a fan-shaped plate. The sleeve has a detection end and an installation end along its extension direction, forming an installation cavity inside. A detection port is opened at the detection end, and an air inlet is opened on the side wall of the sleeve. Cooling air enters the installation cavity through the air inlet and flows out from the detection port, thus forming a continuous positive pressure air curtain in front of the detection port. This prevents high-temperature flue gas from backflowing and reduces the temperature inside the cavity, thereby controlling the ambient temperature of the distance sensor within an allowable range. This allows the distance sensor to adapt to high-temperature working environments, effectively improving the accuracy of the distance sensor in measuring gaps and significantly extending its service life. Furthermore, the continuous positive pressure air curtain formed in front of the detection port also has a self-cleaning function, effectively preventing dust from entering the installation cavity and affecting the measurement accuracy of the distance sensor. This also prevents dust accumulation at the detection port, ensuring the reliability of gap measurement.

[0015] Furthermore, the gap measuring device of this invention mounts the distance sensor onto the sleeve via an installation structure, such that the sensing end of the distance sensor extends into the mounting cavity and faces the detection end, and can move along the extension direction of the mounting cavity. By moving the distance sensor along the extension direction of the sleeve, the relative position between the sensing end and the detection end can be changed, enabling zero-point adjustment under different references, thereby further improving the accuracy of the distance sensor in measuring the gap. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A cross-sectional schematic diagram of an embodiment of the air preheater provided by this utility model; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is a top view schematic diagram of an embodiment of the air preheater provided by this utility model.

[0018] Explanation of icon numbers: 100. Gap measuring device; 10. Sleeve; 11. Mounting cavity; 111. Third threaded section; 12. Detection end; 13. Mounting end; 131. Mounting port; 14. Air inlet; 20. Measuring component; 21. Mounting structure; 211. Mounting base; 2111. Threaded hole; 2112. Second threaded section; 2113. Abutment part; 2114. Insertion part; 2115. Mounting step; 22. Distance sensor; 221. Assembly end; 2211. First threaded section; 2212. Nut; 222. Sensing end; 200. Air preheater; 201. Sector plate; 202. Preheater body; 203. Gap.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] The air preheater is a crucial component of a boiler. It utilizes the temperature of the flue gas at the boiler's tail end to heat the combustion air, effectively reducing the exhaust gas temperature and improving the boiler's thermal efficiency. Since most grid-connected generator sets currently use rotary air preheaters, a gap is formed between the preheater's fan-shaped plate and the preheater body to allow air and flue gas to flow. Currently, the size of this gap is typically adjusted by changing the distance between the fan-shaped plate and the preheater body to improve the efficiency of heat exchange between air and flue gas. Therefore, to achieve optimal heat exchange efficiency, precise control of the gap size is necessary, requiring a gap measuring device to measure the distance between the fan-shaped plate and the preheater body. However, current gap measuring devices are ill-suited for high-temperature operating environments and have poor measurement accuracy. This invention proposes a gap measuring device for air preheaters.

[0024] Please see Figures 1 to 3 In one embodiment of the present invention, the air preheater 200 includes a sector plate 201 and a preheater body 202, with a gap 203 formed between the preheater body 202 and the sector plate 201. The gap measuring device 100 of the air preheater 200 includes a sleeve 10 and a measuring component 20. The sleeve 10 is used to be installed on the sector plate 201, and an installation cavity 11 is provided inside the sleeve 10. The two ends of the sleeve 10 along its extension direction are a detection end 12 and an installation end 13, respectively. The detection end 12 forms a detection port, and a cooling air supply is provided on one side of the sleeve 10. The air inlet 14 and the detection port are both connected to the mounting cavity 11. The measuring component 20 includes a mounting structure 21 and a distance sensor 22. The mounting structure 21 is located at the mounting end 13. The distance sensor 22 is movably mounted at the mounting end 13. The sensing end 222 of the distance sensor 22 extends into the mounting cavity 11 and is positioned towards the detection end 12. The distance sensor 22 can move relative to the mounting structure 21 along the extension direction of the sleeve 10 to drive the sensing end 222 closer to or further away from the detection end 12. The detection end 12 is used to measure the size of the gap 203.

[0025] The technical solution of this utility model involves setting a sleeve 10 on a fan-shaped plate 201. The sleeve 10 has a detection end 12 and an installation end 13 along its extension direction, forming an installation cavity 11 inside. The detection end 12 has a detection port, and the side wall of the sleeve 10 has an air inlet 14. Cooling air enters the installation cavity 11 through the air inlet 14 and flows out from the detection port, thereby forming a continuous positive pressure air curtain in front of the detection port. This prevents high-temperature flue gas from backflowing and reduces the temperature inside the cavity, thus controlling the ambient temperature of the distance sensor 22 within the allowable range. This allows the distance sensor 22 to adapt to high-temperature working environments, effectively improving the accuracy of the distance sensor 22 in measuring the gap 203 and significantly extending its service life. Furthermore, the continuous positive pressure air curtain formed in front of the detection port also has a self-cleaning function, effectively preventing dust from entering the installation cavity 11 and affecting the measurement accuracy of the distance sensor 22. This also prevents dust accumulation in the detection port, ensuring the reliability of the gap 203 measurement.

[0026] Furthermore, the gap measuring device 100 of this invention mounts the distance sensor 22 to the sleeve 10 via the mounting structure 21, such that the sensing end 222 of the distance sensor 22 extends into the mounting cavity 11 and faces the detection end 12, and can move along the extending direction of the mounting cavity 11. By moving the distance sensor 22 along the extending direction of the sleeve 10, the relative position between the sensing end 222 and the detection end 12 can be changed, enabling zero-point adjustment under different references, thereby further improving the accuracy of the distance sensor 22 in measuring the gap 203.

[0027] In one embodiment of the present invention, an installation port 131 communicating with the installation cavity 11 is formed at the installation end 13 of the sleeve 10. The installation structure 21 includes a mounting base 211, which is installed at the installation port 131 and seals the installation port 131. The distance sensor 22 extends in the same direction as the sleeve 10, and the two ends of the distance sensor 22 along its extension direction are an assembly end 221 and a sensing end 222, respectively. The assembly end 221 is movably inserted through the mounting base 211 and partially extends out of the installation port 131. The distance sensor 22 can move relative to the mounting base 211 along the extension direction of the sleeve 10.

[0028] Specifically, the mounting end 13 of the sleeve 10 has a mounting port 131, which is positioned directly opposite the detection port. The mounting base 211 is placed in the mounting port 131. By opening the mounting port 131 at the mounting end 13 of the sleeve 10, the mounting base 211 can be installed, allowing the distance sensor 22 mounted on the mounting base 211 to extend into the mounting cavity 11. Furthermore, after the mounting base 211 is installed in the mounting port 131, the mounting port 131 can be sealed, maintaining positive pressure inside the mounting cavity 11. The structural design is ingenious.

[0029] In one embodiment of the present invention, the mounting base 211 has a threaded hole 2111 that communicates with the mounting cavity 11, and the outer periphery of the assembly end 221 has a first threaded section 2211. The first threaded section 2211 is threadedly engaged with the threaded hole 2111 so that by screwing the assembly end 221, the distance sensor 22 can be moved relative to the mounting base 211 along the extension direction of the sleeve 10.

[0030] Specifically, the mounting base 211 has a threaded hole 2111 coaxial with the mounting cavity 11, and the mounting end 221 of the distance sensor 22 has a first threaded section 2211 on its outer periphery, which engages with the threaded hole 2111. When calibration is required, simply screwing on the mounting end 221 will allow the distance sensor 22 to move precisely forward or backward along the extension direction of the sleeve 10. Furthermore, the engagement between the first threaded end and the threaded hole 2111 enables self-locking between the distance sensor 22 and the mounting base 211, ensuring that the distance sensor 22 remains in its position for a long time without additional tightening after adjustment. Fine-tuning via screwing allows for millimeter-level or even smaller step adjustments to the zero point, ensuring calibration accuracy. Moreover, the entire process requires no disassembly of any parts and can be completed manually or with a regular wrench, making it simple and convenient.

[0031] In one embodiment of the present invention, a nut 2212 is fitted on the part of the assembly end 221 located outside the threaded hole 2111. The nut 2212 is threadedly engaged with the first threaded section 2211 and abuts against the side of the mounting base 211 away from the detection port.

[0032] Specifically, the portion of the assembly end 221 extending out of the mounting port 131 is provided with a first threaded section 2211, and a nut 2212 is screwed onto the first threaded end. After calibration, the nut 2212 is tightened until it abuts against the end face of the mounting base 211 away from the detection port, thereby locking the mounting base 211 and the distance sensor 22 a second time, so that the distance sensor 22 can be more firmly installed on the mounting base 211, preventing the sensor from axially loosening due to operating vibration.

[0033] In one embodiment of the present invention, the mounting base 211 is detachably sealed to the mounting opening 131.

[0034] Specifically, the mounting base 211 is detachably sealed at the mounting port 131 of the sleeve 10. When it is necessary to replace or repair the distance sensor 22, the mounting base 211 can be removed as a whole, and the distance sensor 22 can be taken out together with the mounting base 211, which is simple and convenient.

[0035] In one embodiment of the present invention, a second threaded segment 2112 is formed on the outside of the mounting base 211, and a third threaded segment 111 is formed at the position where the mounting opening 131 is formed on the cavity wall of the mounting cavity 11. The second threaded segment 2112 and the third threaded segment 111 are threadedly engaged.

[0036] Furthermore, a second threaded section 2112 is formed on the outer periphery of the mounting base 211, and a corresponding third threaded section 111 is formed on the cavity wall of the mounting cavity 11 at the mounting opening 131. Through the threaded engagement of the second threaded section 2112 and the third threaded section 111, the mounting base 211 can be securely sealed in the mounting opening 131, making installation simple. When maintenance is required, the mounting base 211 can be easily removed by simply unscrewing it in the reverse direction, making disassembly simple.

[0037] In one embodiment of the present invention, the mounting base 211 includes an abutment portion 2113 and an insertion portion 2114. The insertion portion 2114 is connected to the end of the abutment portion 2113 facing the sleeve 10, and an installation step 2115 is formed between the insertion portion 2113 and the abutment portion 2114. A second threaded section 2112 is formed on the outer periphery of the insertion portion 2114. The insertion portion 2114 passes through the mounting opening 131 and is inserted into the mounting cavity 11. The abutment portion 2113 is located outside the mounting cavity 11, and the installation step 2115 abuts against the mounting end 13.

[0038] Specifically, the mounting base 211 is coaxially composed of an abutment portion 2113 and an insertion portion 2114. The insertion portion 2114 has a second threaded section 2112 on its outer periphery. During assembly, the insertion portion 2114 passes through the mounting port 131 and is screwed into the mounting cavity 11 until the abutment portion 2113 is in contact with the end face of the mounting end 13. The mounting step 2115 abuts against the end face of the mounting end 13 of the sleeve 10, which further improves the reliability of the sealing of the mounting base 211 to the mounting port 131, allowing the mounting cavity 11 to stably form a positive pressure. Furthermore, because the abutment portion 2113 and the end face of the mounting end 13 abut against each other, the abutment portion 2113 is always located outside the mounting groove, thus allowing personnel to always turn the knob on the abutment portion 2113, ensuring that the mounting base 211 can be installed and removed relatively easily.

[0039] In one embodiment of this utility model, the distance sensor 22 is an eddy current sensor. The eddy current sensor works on the principle of electromagnetic induction, and can obtain the gap 203 signal without contacting the preheater body 202, completely eliminating mechanical wear and extending its service life; moreover, it is not sensitive to dust and oil mist, and when used with a cooling air curtain, it can maintain stable measurement accuracy and linearity in high-temperature and high-dust flue gas environments, further improving the reliability of gap 203 measurement.

[0040] This utility model also proposes an air preheater 200, which includes a preheater body 202 and a sector plate 201. A gap 203 is formed between the sector plate 201 and the preheater body 202. The sector plate 201 can move towards or away from the preheater body 202 to adjust the size of the gap 203. A gap measuring device 100 of the air preheater 200 is installed on the sector plate 201. The detection end 12 of the gap measuring device 100 is located close to the preheater body 202 and is used to measure the size of the gap 203. The specific structure of the gap measuring device 100 of the air preheater 200 is as described in the above embodiments. Since this air preheater 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0041] In one embodiment of the present invention, the air preheater 200 includes a plurality of sector plates 201, and a plurality of gap measuring devices 100 are provided at intervals on each sector plate 201.

[0042] Specifically, the air preheater 200 includes multiple sector plates 201, and multiple gap measuring devices 100 are spaced apart on each sector plate 201. The detection end 12 of each gap measuring device 100 is close to the preheater body 202. Each gap measuring device 100 can detect the size of the gap 203 at the corresponding position on its sector plate 201. By weighted averaging the gap 203 sizes measured by multiple gap measuring devices 100, a more accurate gap 203 size can be obtained, further improving the accuracy of measuring the gap 203 size.

[0043] Furthermore, multiple sector plates 201 are provided above and below the preheater body 202.

[0044] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present utility model.

Claims

1. A gap measuring device for an air preheater, characterized in that, The air preheater includes a sector-shaped plate and a preheater body, with a gap formed between the preheater body and the sector-shaped plate. The gap measuring device includes: A sleeve is used to install on the sector plate. The sleeve has an installation cavity. The two ends of the sleeve along its extension direction are a detection end and an installation end, respectively. The detection end forms a detection port. An air inlet for cooling air is opened on one side of the sleeve. The air inlet and the detection port are both connected to the installation cavity. A measuring component includes a mounting structure and a distance sensor. The mounting structure is disposed at the mounting end, and the distance sensor is movably mounted at the mounting end. The sensing end of the distance sensor extends into the mounting cavity and is positioned towards the detection end. The distance sensor can move relative to the mounting structure along the extension direction of the sleeve to move the sensing end closer to or away from the detection end. The detection end is used to measure the size of the gap.

2. The gap measuring device for an air preheater as described in claim 1, characterized in that, The sleeve has an installation port at its mounting end that communicates with the mounting cavity. The mounting structure includes a mounting base, which is mounted on the installation port and seals it. The distance sensor extends in the same direction as the sleeve, and the two ends of the distance sensor along its extension direction are an assembly end and a sensing end, respectively. The assembly end is movably inserted through the mounting base and partially extends out of the installation port. The distance sensor can move relative to the mounting base along the extension direction of the sleeve.

3. The gap measuring device for an air preheater as described in claim 2, characterized in that, The mounting base has a threaded hole communicating with the mounting cavity, and the outer periphery of the assembly end has a first threaded section. The first threaded section is threadedly engaged with the threaded hole so that by screwing the assembly end, the distance sensor can be moved relative to the mounting base along the extension direction of the sleeve.

4. The gap measuring device for an air preheater as described in claim 3, characterized in that, The portion of the assembly end located outside the threaded hole is fitted with a nut, which engages with the first threaded segment and abuts against the side of the mounting base away from the detection port.

5. The gap measuring device for an air preheater as described in claim 2, characterized in that, The mounting base is detachably sealed to the mounting port.

6. The gap measuring device for an air preheater as described in claim 5, characterized in that, The mounting base has a second threaded section on its outer side, and the cavity wall of the mounting cavity has a third threaded section at the position where the mounting opening is formed. The second threaded section and the third threaded section are threadedly engaged.

7. The gap measuring device for an air preheater as described in claim 6, characterized in that, The mounting base includes an abutment portion and an insertion portion. The insertion portion is connected to the end of the abutment portion facing the sleeve and forms a mounting step between the insertion portion and the abutment portion. The outer periphery of the insertion portion has a second threaded section. The insertion portion passes through the mounting opening and is inserted into the mounting cavity. The abutment portion is located outside the mounting cavity, and the mounting step abuts against the mounting end.

8. The gap measuring device for an air preheater as described in any one of claims 1 to 7, characterized in that, The distance sensor is an eddy current sensor.

9. An air preheater, characterized in that, The air preheater includes a preheater body and a sector plate, with a gap formed between the sector plate and the preheater body. The sector plate is movable toward or away from the preheater body to adjust the size of the gap. A gap measuring device for the air preheater as described in any one of claims 1 to 8 is mounted on the sector plate. The detection end of the gap measuring device is located close to the preheater body and is used to measure the size of the gap.

10. The air preheater as claimed in claim 9, characterized in that, The air preheater includes a plurality of sector plates, with a gap formed between each sector plate and the preheater body, and a plurality of gap measuring devices are spaced apart on each sector plate.

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