Air preheating element of boiler

Abstract

The utility model discloses an air preheating element of a boiler, which belongs to the field of air preheaters, solves the problems of ash blockage and blockage in the existing air preheaters, and comprises a main body machine, a top block, a land block and a driving shaft, the top block is fixedly mounted at the top end of the main body machine, and the land block is fixedly mounted at the bottom end of the main body machine. The air pre-heater comprises a main body machine, a driving shaft is rotatably installed in the main body machine, a heat exchange mechanism is fixedly installed outside the driving shaft, the heat exchange mechanism comprises a connecting frame, a hot end, a fixing frame and a cold end, and the connecting frame is fixedly installed at the top end of the outer portion of the driving shaft. The middle-temperature end heat storage element is removed, the ash blocking problem of the middle-temperature end heat exchange element is solved, the operation resistance of the air pre-heater is reduced, the effective utilization rate of the heat exchange area is improved, and the waveform replacement of the cold end and the hot end ensures that the smoke exhaust temperature is not lower than the original design temperature, the smoke resistance is reduced, and therefore the working quality of equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the field of air preheaters, and particularly relates to a boiler air preheating element. Background Technique

[0002] A preheater is a heating surface that uses the flue gas in the tail flue of a boiler to preheat the air before entering the boiler to a certain temperature through internal fins, which is used to improve the heat exchange performance of the boiler and reduce energy consumption. It is generally abbreviated as an air preheater and is mostly used in coal-fired boilers. Its application in boilers is generally of the three-compartment type.

[0003] Chinese Utility Model Patent CN218380653U discloses a boiler air preheater anti-blocking structure, which includes a boiler air preheater body and connecting plates fixedly installed on both sides inside the boiler air preheater. A rotating column is rotatably installed between the two connecting plates. An adjusting component is arranged inside the rotating column. Rotating frames are arranged at the top and bottom of the rotating column. A scraper body is slidably installed on the side of the rotating frame away from the adjusting component;

[0004] The above design can clean the impurities inside the air preheater through the cooperation of multiple components and scrapers to prevent the air preheater itself from being blocked. However, the current blockage of the air preheater is mainly due to the fact that the heat storage element of the air preheater is designed as a corrugated plate with high resistance and high heat exchange performance, but its resistance characteristics are poor. After long-term operation, the heat storage element is blocked by ash and damaged. Once serious ash blockage and damage occur, the heat exchange performance of the heat storage element will also be greatly affected, resulting in a decrease in the temperature of the primary and secondary hot air and an increase in the flue gas temperature, affecting the economic operation of the unit. Summary of the Utility Model

[0005] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] To solve the problems raised in the above background technique, the utility model adopts the following technical solutions.

[0007] A boiler air preheating element, comprising a main body machine, a top block, a bottom block and a drive shaft. A top block is fixedly installed at the top end of the main body machine, a bottom block is fixedly installed at the bottom end of the main body machine, and a drive shaft is rotatably installed inside the main body machine. A heat exchange mechanism is fixedly installed outside the drive shaft. The heat exchange mechanism includes a connecting frame, a hot end, a fixing frame and a cold end. A connecting frame is fixedly installed at the top end outside the drive shaft, the hot end is fixedly installed outside the connecting frame, a fixing frame is fixedly installed at the bottom end outside the drive shaft, and the cold end is fixedly installed outside the fixing frame. A connecting mechanism is fixedly installed at the top end of the top block, and a matching mechanism is arranged on the side surface of the main body machine.

[0008] As a preferred technical solution of the present invention, the hot end and the fixing frame elements are replaced with special waveforms more suitable for denitration units. The hot end adopts a high-efficiency and low-resistance DUN corrugated heat exchange element, and the cold end adopts a brand-new second-generation TF4 corrugated enamel heat exchange element dedicated to denitration.

[0009] As a preferred technical solution of the present invention, the heat exchange mechanism is changed from three layers inside to two layers, and the heat exchange elements in the middle end are removed.

[0010] As a preferred technical solution of the present invention, the connecting mechanism includes a connecting rod, a cross bar, a support rod and a strengthening rod. Connecting rods are symmetrically and fixedly installed on the surface of the top block, the cross bar is equidistantly fixedly installed between the connecting rods, the support rods are symmetrically and fixedly installed on both sides of the connecting rods, and the strengthening rod is fixedly installed on the side surface of the support rod.

[0011] As a preferred technical solution of the present invention, both the ends of the strengthening rod and the support rod are fixedly connected to the inner wall of the top block.

[0012] As a preferred technical solution of the present invention, the matching mechanism includes a second air outlet, a first air outlet, a second air inlet and a first air inlet. A second air outlet is opened at the top end of the top block, a first air outlet is fixedly installed on one side of the top end of the top block, a second air inlet is fixedly installed on the side surface of the main body machine, and a first air inlet is opened at the bottom end of the bottom block.

[0013] As a preferred technical solution of the present invention, smoke inlet slots are equidistantly opened inside the second air inlet.

[0014] As a preferred technical solution of the present invention, the sum of the heights of the main body machine, the top block and the bottom block is 2650 mm.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In the present utility model, by providing a heat exchange mechanism, the traditional three-layer structure of the air preheater can be changed, the heat storage elements at the middle and medium-temperature ends can be removed to solve the problem of ash blockage of the heat exchange elements at the medium-temperature end, the operating resistance of the air preheater can be reduced, the effective utilization rate of the heat exchange area can be improved, and the replacement of the waveforms of both the cold end and the hot end can ensure that the flue gas temperature is not lower than the original design temperature, while reducing the flue gas resistance, thereby improving the working quality of the equipment itself;

[0017] In the present utility model, by providing a connection mechanism and a cooperation mechanism, multiple groups of air inlets and outlets can be added to facilitate the flow of air inside the equipment, and the connection between components can be strengthened during use, improving the stability of the equipment during use, thereby improving the working quality of the equipment itself. Brief Description of the Drawings

[0018] Figure 1 is a perspective view of the overall structure of the present utility model;

[0019] Figure 2 is a cross-sectional view of the main body machine structure of the present utility model;

[0020] Figure 3 is a perspective view of the external structure of the present utility model plot;

[0021] Figure 4 is a schematic structural view of the heat exchange mechanism in the present utility model;

[0022] Figure 5 is a schematic structural view of the connection mechanism in the present utility model;

[0023] Figure 6 is a schematic structural view of the cooperation mechanism in the present utility model.

[0024] The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0025] 1, main body machine; 2, top block; 3, plot; 4, drive shaft; 5, heat exchange mechanism; 51, connecting frame; 52, hot end; 53, fixing frame; 54, cold end; 6, connection mechanism; 61, connecting rod; 62, cross bar; 63, support rod; 64, strengthening rod; 7, cooperation mechanism; 71, second air outlet; 72, first air outlet; 73, second air inlet; 74, first air inlet. Detailed Embodiment

[0026] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model is made in conjunction with the drawings in the specification.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0028] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present utility model. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments. The present utility model provides the following embodiments.

[0029] As shown by Figure 1 , Figure 2 and Figure 3 shown, a boiler air preheating element includes a main body 1, a top block 2, a bottom block 3, and a drive shaft 4. A top block 2 is fixedly installed at the top of the main body 1, a bottom block 3 is fixedly installed at the bottom of the main body 1, and a drive shaft 4 is rotatably installed inside the main body 1. A heat exchange mechanism 5 is fixedly installed outside the drive shaft 4. The heat exchange mechanism 5 includes a connecting frame 51, a hot end 52, a fixing frame 53, and a cold end 54. A connecting frame 51 is fixedly installed at the top end outside the drive shaft 4, the hot end 52 is fixedly installed outside the connecting frame 51, a fixing frame 53 is fixedly installed at the bottom end outside the drive shaft 4, and the cold end 54 is fixedly installed outside the fixing frame 53. A connecting mechanism 6 is fixedly installed at the top of the top block 2, and a matching mechanism 7 is arranged on the side of the main body 1.

[0030] During use, by installing the device at the target position and then using the heat exchange mechanism 5, a preheating function is provided for the entire device. By using the hot end 52 and the cold end 54, it is ensured that the ammonium bisulfate deposition zone falls on the cold end 54 element under various load conditions. Due to the adoption of the latest high-efficiency and uniform flow field waveform, while ensuring that the flue gas temperature is not lower than the original design temperature, the flue gas resistance is reduced, ensuring the long-term stability of the device. And because of the adjustment of the heights of the hot end 52 (1400 mm) and the cold end 54 (1200 mm), the operating resistance of the air preheater can be reduced, and the effective utilization rate of the heat exchange area can be improved, thereby improving the working quality of the device itself. And because of the use of the connecting mechanism 6, the stability of the device itself can be strengthened, while the use of the matching mechanism 7 can assist the entry and exit of the flue gas, adding matching notches, and strengthening the preheating effect of the device itself.

[0031] As shown in the attached Figure 4As shown, in this embodiment, the hot end 52 and the fixing frame 53 components are replaced with special waveforms more suitable for the denitration unit. The hot end 52 adopts a high-efficiency and low-resistance DUN corrugated heat exchange element, and the cold end 54 adopts a new second-generation TF4 corrugated enamel heat exchange element dedicated to denitration. During use, it is ensured that the ammonium bisulfate deposition zone falls on the cold end 54 element under various load conditions. By adopting the latest high-efficiency and uniform flow field waveform, the flue gas resistance is reduced while ensuring that the flue gas temperature is not lower than the original design temperature, ensuring the long-term stability of the equipment and improving the economic benefits of the transformation.

[0032] As shown in the attached Figure 4 As shown, in this embodiment, the heat exchange mechanism 5 is changed from three layers inside to two layers, removing the heat exchange elements in the middle section. During use, the size of the regenerative elements is modified, removing the regenerative elements in the medium-temperature section, and changing from the original three layers to two layers, solving the problem of ash blockage in the medium-temperature heat exchange elements, reducing the operating resistance of the air preheater, and improving the effective utilization rate of the heat exchange area.

[0033] As shown in the attached Figure 5 As shown, in this embodiment, the connecting mechanism 6 includes a connecting rod 61, a cross bar 62, a support rod 63, and a strengthening rod 64. The connecting rod 61 is symmetrically and fixedly installed on the surface of the top block 2, the cross bar 62 is equidistantly and fixedly installed between the connecting rods 61, the support rod 63 is symmetrically and fixedly installed on both sides of the connecting rod 61, and the strengthening rod 64 is fixedly installed on the side of the support rod 63.

[0034] During use, through the use of the connecting rod 61 and the cross bar 62, it is used to provide stable support for the user. Moreover, the installation and use of the support rods 63 and the strengthening rods 64 on both sides ensure the stability of the connection between the connecting rod 61 and the inner wall of the top block 2. Subsequently, a driving component can be installed in the middle part of the connecting rod 61, which provides convenience for the use of the equipment.

[0035] As shown in the attached Figure 5 As shown, in this embodiment, both the ends of the strengthening rod 64 and the support rod 63 are fixedly connected to the inner wall of the top block 2. During use, the connection between the connecting rod 61 and the top block 2 is strengthened, ensuring the stability of the equipment during operation.

[0036] As shown in the attached Figure 6 As shown, in this embodiment, the matching mechanism 7 includes a second air outlet 71, a first air outlet 72, a second air inlet 73, and a first air inlet 74. The second air outlet 71 is opened at the top of the top block 2, the first air outlet 72 is fixedly installed on one side of the top of the top block 2, the second air inlet 73 is fixedly installed on the side of the main body machine 1, and the first air inlet 74 is opened at the bottom of the plot 3.

[0037] In use, through the use of the second air inlet 73 and the first air inlet 74, auxiliary air enters the interior of the device, and the cooperation of the top second air outlet 71 and the first air outlet 72 can quickly discharge the air inside the device, assisting the device in preheating operations and enhancing the working quality of the device itself.

[0038] As shown by the appendix Figure 6 As shown, in this embodiment, smoke inlet slots are equidistantly arranged inside the second air inlet 73, facilitating the entry of air from the side into the interior of the device during use and expanding the air inlet of the device.

[0039] As shown by the appendix Figure 1 As shown, in this embodiment, the sum of the heights of the main body 1, the top block 2, and the base block 3 is 2650 mm, which limits the overall size of the device during use and facilitates the installation and use of the subsequent hot end 52 and cold end 54 with different specifications.

[0040] The above content further elaborates on the present utility model in combination with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as falling within the protection scope determined by the claims submitted for the present utility model.

Claims

1. A boiler air preheating element, comprising a main body (1), a top block (2), a ground block (3) and a drive shaft (4), wherein the top block (2) is fixedly mounted on the top of the main body (1), the ground block (3) is fixedly mounted on the bottom of the main body (1), and the drive shaft (4) is rotatably mounted inside the main body (1), characterized in that: A heat exchange mechanism (5) is fixedly mounted on the outside of the drive shaft (4), and the heat exchange mechanism (5) comprises a connecting frame (51), a hot end (52), a fixing frame (53) and a cold end (54). The connecting frame (51) is fixedly mounted on the top end of the outside of the drive shaft (4), the hot end (52) is fixedly mounted on the outside of the connecting frame (51), the fixing frame (53) is fixedly mounted on the bottom end of the outside of the drive shaft (4), and the cold end (54) is fixedly mounted on the outside of the fixing frame (53). A connecting mechanism (6) is fixedly mounted on the top end of the top block (2), and a matching mechanism (7) is arranged on the side of the main machine (1).

2. A boiler air preheating element according to claim 1, characterized in that: The hot end (52) and the fixing frame (53) elements are replaced with special waveforms more suitable for the denitrification unit. The hot end (52) adopts a high-efficiency, low-resistance DUN corrugated heat exchange element, and the cold end (54) adopts a brand-new second-generation TF4 corrugated enamel heat exchange element dedicated to denitrification.

3. A boiler air preheating element according to claim 1, characterized in that: The heat exchange mechanism (5) is changed from three layers inside to two layers, and the heat exchange element at the middle end is removed.

4. A boiler air preheating element according to claim 1, characterized in that: The connecting mechanism (6) comprises connecting rods (61), cross rods (62), support rods (63) and reinforcing rods (64); the connecting rods (61) are symmetrically fixedly mounted on the surface of the top block (2); the cross rods (62) are equidistantly fixedly mounted between the connecting rods (61); the support rods (63) are symmetrically fixedly mounted on both sides of the connecting rods (61); and the reinforcing rods (64) are fixedly mounted on the sides of the support rods (63).

5. A boiler air preheating element according to claim 4, characterized in that: The ends of the reinforcing rod (64) and the supporting rod (63) are both fixedly connected to the inner wall of the top block (2).

6. A boiler air preheating element according to claim 1, characterized in that: The matching mechanism (7) comprises a second air outlet (71), a first air outlet (72), a second air inlet (73) and a first air inlet (74); the second air outlet (71) is provided at the top of the top block (2); the first air outlet (72) is fixedly mounted on one side of the top of the top block (2); the second air inlet (73) is fixedly mounted on the side of the main machine (1); and the first air inlet (74) is provided at the bottom of the ground block (3).

7. A boiler air preheating element according to claim 6, characterized in that: Smoke inlet slots are equidistantly provided inside the second air inlet (73).

8. A boiler air preheating element according to claim 1, characterized in that: The sum of the heights of the main machine (1), the top block (2) and the ground block (3) is 2650 mm.

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