Boiler low-temperature economizer

Abstract

The invention belongs to the technical field of low-temperature economizers, and discloses a low-temperature economizer of a boiler. Comprising a heat exchange structure, a transmission structure is installed on the heat exchange structure, outer cleaning structures which slide in the heat exchange structure and are symmetrically distributed and inner cleaning structures which are distributed in an array mode are installed on the transmission structure, and transmission connecting plates are installed between the corresponding outer cleaning structures and between the corresponding inner cleaning structures; through cooperation of structures such as the vertical transmission motor and the horizontal transmission motor, the outer fixed scraper blade and the inner fixed scraper blade are driven to scrape accumulated dust on the shell baffle and the grading membrane, and by taking the outer fixed scraper blade as an example, due to the fact that the accumulated dust attached to smoke has viscosity, the dust can be scraped off by the inner fixed scraper blade; the outer fixed brush is used for cleaning, so that dust is adhered to the outer fixed brush, the dust cleaning effect is weakened, the accumulated dust cannot be completely scraped by only scraping the accumulated dust through the outer fixed scraper, and the outer fixed scraper is matched with the outer fixed brush.

Description

Technical Field

[0001] This invention belongs to the field of low-temperature economizer technology, specifically a low-temperature economizer for boilers. Background Technology

[0002] Low-temperature economizers are devices that effectively save coal and improve boiler efficiency in the low-temperature range. They are mainly used in the medium-low temperature range of the air preheater outlet of large boilers in power plants, combined heat and power plants, etc. By recovering the waste heat of flue gas to heat the boiler feedwater, they effectively reduce the exhaust heat efficiency. Low-temperature economizers are usually installed on the tail flue of the boiler air preheater outlet. They can not only improve the efficiency of electrostatic precipitators and meet the requirements for low emissions, but also reduce power consumption and the size of downstream equipment. At the same time, they can remove most of the acidic gases.

[0003] Existing low-temperature economizers accumulate a large amount of dust on their inner walls during operation due to the introduction of high-temperature flue gas. The dust is sticky due to the combustion materials, making it difficult to clean. Most low-temperature economizers are cleaned by using a high-pressure water gun after shutdown, which leads to downtime, reduced efficiency, and losses. Summary of the Invention

[0004] To address the problem mentioned in the background art that washing away accumulated ash after shutdown leads to reduced efficiency, this invention provides a low-temperature economizer for boilers.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a boiler low-temperature economizer, comprising a heat exchange structure, a transmission structure installed on the heat exchange structure, and symmetrically distributed outer cleaning structures and arrayed inner cleaning structures sliding within the heat exchange structure respectively installed on the transmission structure, with transmission connecting plates installed between the corresponding outer cleaning structures and between the corresponding inner cleaning structures.

[0006] The external cleaning structure includes an external mounting bracket that slides at the inner edge of the heat exchange structure, an external fixing bracket installed on the lower side of the external mounting bracket, an external fixing scraper installed on the lower side of the external fixing bracket, and an external fixing brush installed on the external fixing bracket. The widths of the external mounting bracket, the external fixing bracket, and the external fixing scraper are the same.

[0007] The internal cleaning structure includes an internal mounting frame that slides in the middle of the heat exchange structure, an internal fixing frame installed on the lower side of the internal mounting frame, an internal fixing scraper installed on the lower side of the internal fixing frame, and an internal fixing brush installed inside the internal fixing frame. The widths of the internal mounting frame, the internal fixing frame, and the internal fixing scraper are the same.

[0008] Preferably, the heat exchange structure includes an outer shell frame, on which symmetrically distributed outer shell baffles are installed. An air inlet and an air outlet are respectively installed on the outer side of the outer shell baffles away from the outer shell frame, and the air inlet, air outlet and outer shell frame are connected.

[0009] Preferably, a liquid flow pipe is installed inside the outer shell frame and extends through the outer shell baffle. The liquid flow pipe is equipped with segmented diaphragms that are arrayed inside the outer shell frame, and the height of the segmented diaphragms is lower than that of the outer shell baffle.

[0010] Preferably, the transmission structure includes an array of sealing covers mounted on the outer shell frame, a sliding sealing plate slidably connected inside the sealing cover, an outer transmission rod slidably connected through the sliding sealing plate at the edge position, and an inner transmission rod slidably connected through the sliding sealing plate at the middle position, the outer transmission rod or the inner transmission rod being rotatably connected to the transmission connecting plate respectively.

[0011] Preferably, a horizontal drive motor is installed outside the sealing cover, and a horizontal drive rod is internally threaded to the horizontal drive motor. A vertical drive motor is slidably connected inside the sealing cover. A limiting ring is installed on the side of the vertical drive motor near the horizontal drive motor. The horizontal drive rod rotates within the limiting ring. The vertical drive motor is internally threaded to either the outer drive rod or the inner drive rod.

[0012] Preferably, an outer limiting slide rod is installed on the outer mounting frame, an outer sliding plate is slidably connected through the outer limiting slide rod, an outer pressure spring is provided around the outer limiting slide rod between the outer sliding plate and the outer mounting frame, an outer sliding scraper is installed on the side of the outer sliding plate away from the outer mounting frame, an outer rotating frame is installed on the outer sliding scraper, and an outer sliding brush is installed between the outer rotating frame and the outer sliding plate.

[0013] Preferably, the inner mounting frame is equipped with symmetrically distributed inner limiting slide rods, and an inner sliding plate is slidably connected through the inner limiting slide rods. An inner pressure spring is provided around the inner limiting slide rods between the inner sliding plate and the inner mounting frame. An inner sliding scraper is installed on the side of the inner sliding plate away from the inner mounting frame. An inner rotating frame is installed on the inner sliding scraper. An inner sliding brush is installed between the inner rotating frame and the inner sliding plate.

[0014] Preferably, the width of the outer sliding scraper is smaller than the width of the outer mounting bracket, and the width of the inner sliding scraper is smaller than the width of the inner mounting bracket.

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

[0016] This invention utilizes a combination of vertical and horizontal drive motors to drive external and internal fixed scrapers to remove accumulated ash from the outer casing baffle and dividing diaphragm. Taking the external fixed scraper as an example, since the ash adhering to the flue gas is sticky, cleaning it with the external fixed brush would result in dust sticking to the brush, weakening the cleaning effect. Simply scraping the ash with the external fixed scraper alone cannot completely remove it. Therefore, by using the external fixed scraper and external fixed brush together, the sticky ash is first scraped off, and then the external fixed brush cleans up any remaining ash, ensuring that the device cleans the ash thoroughly during use. On the other hand, the external sliding plate sliding on the outer mounting frame and the internal sliding plate sliding on the inner mounting frame ensure that areas obstructed by the liquid flow pipe during the downward movement of the external and internal sliding scrapers are also cleaned by the external and internal sliding scrapers and simultaneously by the external and internal sliding brushes, increasing the area cleaned of accumulated ash. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure connection of the present invention;

[0019] Figure 3 This is a schematic diagram of the heat exchange structure connection of the present invention;

[0020] Figure 4 This is a schematic diagram of the transmission structure connection of the present invention;

[0021] Figure 5 This is an exploded view of the internal structure of the transmission mechanism of the present invention;

[0022] Figure 6 This is a schematic diagram of the connection between the internal and external cleaning structures of the present invention;

[0023] Figure 7 This is a schematic diagram of the external cleaning structure connection of the present invention;

[0024] Figure 8 This is a schematic diagram of the internal cleaning structure connection of the present invention.

[0025] In the diagram: 1. Heat exchange structure; 11. Outer shell frame; 12. Outer shell baffle; 13. Air inlet; 14. Air outlet; 15. Liquid flow pipe; 16. Dividing diaphragm;

[0026] 2. Transmission structure; 21. Sealing cover; 22. Sliding sealing plate; 23. Outer transmission rod; 24. Inner transmission rod; 25. Vertical transmission motor; 26. Limiting rotating ring; 27. Horizontal transmission motor; 28. Horizontal transmission rod;

[0027] 3. External cleaning structure; 31. External mounting bracket; 32. External fixing bracket; 33. External fixing scraper; 34. External fixing brush; 35. External limiting slide bar; 36. External sliding plate; 37. External pressure spring; 38. External sliding scraper; 39. External rotating bracket; 310. External sliding brush;

[0028] 4. Internal cleaning structure; 41. Internal mounting bracket; 42. Internal fixing bracket; 43. Internal fixing scraper; 44. Internal fixing brush; 45. Internal limiting slide bar; 46. Internal sliding plate; 47. Internal pressure spring; 48. Internal sliding scraper; 49. Internal sliding brush; 410. Internal rotating bracket;

[0029] 5. Transmission connecting plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 8 As shown, the present invention provides a low-temperature economizer for boilers, including a heat exchange structure 1, a transmission structure 2 mounted on the heat exchange structure 1, and symmetrically distributed outer cleaning structures 3 and arrayed inner cleaning structures 4 sliding within the heat exchange structure 1, respectively mounted on the transmission structure 2. Transmission connecting plates 5 are respectively installed between the corresponding outer cleaning structures 3 and inner cleaning structures 4.

[0032] The external cleaning structure 3 includes an external mounting frame 31 that slides at the inner edge of the heat exchange structure 1, an external fixing frame 32 that is installed on the lower side of the external mounting frame 31, an external fixing scraper 33 that is installed on the lower side of the external fixing frame 32, and an external fixing brush 34 that is installed on the external fixing frame 32. The widths of the external mounting frame 31, the external fixing frame 32 and the external fixing scraper 33 are the same.

[0033] The internal cleaning structure 4 includes an internal mounting frame 41 that slides in the middle of the heat exchange structure 1. An internal fixing frame 42 is installed on the lower side of the internal mounting frame 41. An internal fixing scraper 43 is installed on the lower side of the internal fixing frame 42. An internal fixing brush 44 is installed inside the internal fixing frame 42. The widths of the internal mounting frame 41, the internal fixing frame 42 and the internal fixing scraper 43 are the same.

[0034] Using the above method: High-temperature flue gas is introduced into the heat exchange structure 1. The dust contained in the flue gas will accumulate inside the heat exchange structure 1. During the flow of the high-temperature flue gas inside the heat exchange structure 1, the transmission structure 2 drives the symmetrically distributed outer mounting bracket 31, outer fixing bracket 32 ​​and outer fixing scraper 33 to slide downward, cleaning the dust adhering inside the heat exchange structure 1. The outer fixing scraper 33 scrapes off the sticky residue adhering to the inner wall of the heat exchange structure 1. Then, the outer fixing brush 34 cleans the remaining dust, and then cleans the dust at the edge of the heat exchange structure 1. At the same time, the transmission structure 2 drives the arrayed inner mounting bracket 41, inner fixing bracket 42 and inner fixing scraper 43 to slide downward, and then the inner fixing scraper 43 scrapes off the dust accumulated in the middle position inside the heat exchange structure 1. Similarly, the inner fixing scraper 43 cleans the sticky residue in the middle position inside the heat exchange structure 1. Then, the inner fixing brush 44 cleans the remaining dust.

[0035] After the transmission structure 2 drives the inner fixed scraper 43 and the outer fixed scraper 33 to slide to the bottom of the heat exchange structure 1, the transmission structure 2 then drives the outer fixed scraper 33 and the inner fixed scraper 43 to slide back to their original positions in the opposite direction. After sliding horizontally for a certain distance, the outer fixed scraper 33 and the inner fixed scraper 43 slide downwards again to clean the accumulated dust in the heat exchange structure 1. Repeat the above steps to clean all the accumulated dust in the heat exchange structure 1.

[0036] like Figure 3 As shown, the heat exchange structure 1 includes an outer shell frame 11, on which symmetrically distributed outer shell baffles 12 are installed. An air inlet 13 and an air outlet 14 are respectively installed on the outer shell baffles 12 away from the outer shell frame 11. The air inlet 13, the air outlet 14 and the outer shell frame 11 are connected.

[0037] A liquid flow pipe 15 is installed inside the outer shell frame 11 and passes through the outer shell baffle 12. A segmented diaphragm 16 distributed in an array inside the outer shell frame 11 is installed on the liquid flow pipe 15. The height of the segmented diaphragm 16 is lower than that of the outer shell baffle 12.

[0038] By using the above method: by installing an air inlet 13 and an air outlet 14 on the outer casing baffle 12, high-temperature flue gas enters the outer casing frame 11 through the air inlet 13 and is discharged through the air outlet 14. The flue gas flows through the baffle 16, and heat exchange occurs between the high-temperature flue gas and the baffle 16, causing the water inside the baffle 16 to heat up, thereby enhancing the utilization rate of flue gas temperature.

[0039] like Figure 4 and Figure 5As shown, the transmission structure 2 includes a sealing cover 21 arrayed on the outer shell frame 11. A sliding sealing plate 22 is slidably connected inside the sealing cover 21. An outer transmission rod 23 is slidably connected through the sliding sealing plate 22 at the edge position. An inner transmission rod 24 is slidably connected through the sliding sealing plate 22 at the middle position. The outer transmission rod 23 or the inner transmission rod 24 are respectively rotatably connected to the transmission connecting plate 5.

[0040] A horizontal drive motor 27 is installed outside the sealing cover 21. A horizontal drive rod 28 is internally threaded to the horizontal drive motor 27. A vertical drive motor 25 is slidably connected inside the sealing cover 21. A limiting ring 26 is installed on the side of the vertical drive motor 25 near the horizontal drive motor 27. The horizontal drive rod 28 rotates within the limiting ring 26. The vertical drive motor 25 is threadedly connected to either the outer drive rod 23 or the inner drive rod 24.

[0041] Using the above method: the vertical drive motor 25 and the horizontal drive motor 27 respectively control the movement of the outer cleaning structure 3 and the inner cleaning structure 4 in the horizontal or vertical direction, thereby cleaning the accumulated dust in the outer shell frame 11. The sliding sealing plate 22, which is slidably connected to the outer drive rod 23 or the inner drive rod 24 respectively, is slidably connected to the sealing cover 21, thereby making the sealing cover 21 and the sliding sealing plate 22 form a sealed structure to prevent the high-temperature flue gas in the outer shell frame 11 from flowing out.

[0042] like Figure 7 As shown, an outer limiting slide bar 35 is installed on the outer mounting bracket 31, and an outer sliding plate 36 is slidably connected through the outer limiting slide bar 35. An outer pressure spring 37 is provided around the outer limiting slide bar 35 between the outer sliding plate 36 and the outer mounting bracket 31. An outer sliding scraper 38 is installed on the side of the outer sliding plate 36 away from the outer mounting bracket 31. An outer rotating frame 39 is installed on the outer sliding scraper 38. An outer sliding brush 310 is installed between the outer rotating frame 39 and the outer sliding plate 36.

[0043] Using the above method: the external fixed scraper 33 and the external fixed brush 34 are at different heights, so that the external fixed scraper 33 first scrapes off the accumulated dust, and then the external fixed brush 34 cleans the remaining accumulated dust. The accumulated dust on the outer shell baffle 12 or the dividing diaphragm 16 between the liquid flow pipes 15 at the position corresponding to the width of the external fixed scraper 33 is cleaned. The dividing diaphragm 16 or the outer shell baffle 12 at the upper and lower positions of the liquid flow pipes 15 are cleaned by the external sliding scraper 38 and the external sliding brush 310, and the external sliding plate 310 is used for cleaning. 6 drives the outer sliding scraper 38 to slide up and down synchronously with the outer fixed scraper 33, thereby cleaning the dust accumulated on the outer shell baffle 12 or the dividing diaphragm 16. When the outer sliding scraper 38 is squeezed against the liquid flow pipe 15, the outer sliding scraper 38 slides into the outer mounting bracket 31, thereby cleaning the dust accumulated on the outer shell baffle 12 or the dividing diaphragm 16 outside the outer contour of the liquid flow pipe 15. By sliding the outer sliding scraper 38, it adapts to the curved surface environment of the outer contour of the liquid flow pipe 15, thereby increasing the area for cleaning the dust.

[0044] like Figure 8 As shown, symmetrically distributed inner limiting slide rods 45 are installed on the inner mounting frame 41. An inner sliding plate 46 is slidably connected through the inner limiting slide rods 45. An inner pressure spring 47 is provided around the inner limiting slide rods 45 between the inner sliding plate 46 and the inner mounting frame 41. An inner sliding scraper 48 is installed on the side of the inner sliding plate 46 away from the inner mounting frame 41. An inner rotating frame 410 is installed on the inner sliding scraper 48. An inner sliding brush 49 is installed between the inner rotating frame 410 and the inner sliding plate 46.

[0045] Using the above method: Since the dust is sticky and not suitable for cleaning with the inner fixed brush 44, the inner fixed scraper 43 and the inner fixed brush 44 are at different heights, so that the inner fixed scraper 43 comes into contact with the dust first, and then scrapes off the dust first. Then the inner fixed brush 44 cleans the remaining dust again to achieve a better cleaning effect and prevent the dust carried in the high-temperature flue gas from adhering to the outer shell baffle 12 and the dividing diaphragm 16.

[0046] On the other hand, the symmetrically distributed inner sliding scrapers 48 sliding on the inner limit slide bar 45 scrape off the dust attached to the outer shell baffle 12 or the dividing diaphragm 16 above and below the liquid flow pipe 15. Since the liquid flow pipe 15 passes through the outer shell baffle 12 and the dividing diaphragm 16, the inner sliding scraper 48 is intermittently squeezed by the liquid flow pipe 15 as it slides downward, causing the inner sliding scraper 48 to slide into the inner mounting bracket 41. At the same time, the edge of the inner sliding scraper 48 continues to slide downward along the outer contour of the liquid flow pipe 15, scraping off the dust on the outer shell baffle 12 and the dividing diaphragm 16, thus achieving the effect of cleaning the dust in the middle of the outer shell baffle 12 and the dividing diaphragm 16.

[0047] like Figure 7 and Figure 8 As shown, the width of the outer sliding scraper 38 is smaller than the width of the outer mounting bracket 31, and the width of the inner sliding scraper 48 is smaller than the width of the inner mounting bracket 41.

[0048] By adopting the above method: since the width of the outer sliding scraper 38 is smaller than the width of the outer mounting bracket 31 and the width of the inner sliding scraper 48 is smaller than the width of the inner mounting bracket 41, after the outer sliding scraper 38 or the inner sliding scraper 48 is squeezed by the liquid flow pipe 15, it slides towards the inner mounting bracket 41 and the outer mounting bracket 31 respectively, so that both the inner sliding scraper 48 and the outer sliding scraper 38 can slide downward between the liquid flow pipe 15, thereby increasing the cleaning area.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A boiler low-temperature economizer, comprising a heat exchange structure (1), a transmission structure (2) is installed on the heat exchange structure (1), and symmetrically distributed outer cleaning structures (3) and arrayed inner cleaning structures (4) are respectively installed on the transmission structure (2) and slide in the heat exchange structure (1), and transmission connecting plates (5) are respectively installed between the corresponding outer cleaning structures (3) and the inner cleaning structures (4), characterized in that: wherein the outer cleaning structure (3) comprises an outer mounting frame (31) that slides at an edge position in the heat exchange structure (1), an outer fixed frame (32) is installed on the lower side of the outer mounting frame (31), an outer fixed scraper (33) is installed on the lower side of the outer fixed frame (32), and an outer fixed brush (34) is installed on the outer fixed frame (32), and the widths of the outer mounting frame (31), the outer fixed frame (32) and the outer fixed scraper (33) are consistent; the inner cleaning structure (4) comprises an inner mounting frame (41) that slides in the middle of the heat exchange structure (1), an inner fixed frame (42) is installed on the lower side of the inner mounting frame (41), an inner fixed scraper (43) is installed on the lower side of the inner fixed frame (42), and an inner fixed brush (44) is installed in the inner fixed frame (42), and the widths of the inner mounting frame (41), the inner fixed frame (42) and the inner fixed scraper (43) are consistent.

2. The boiler low-temperature economizer according to claim 1, characterized in that: the heat exchange structure (1) comprises an outer shell frame (11), symmetrically distributed outer shell baffles (12) are installed on the outer shell frame (11), air inlets (13) and air outlets (14) are respectively installed on the outer sides of the outer shell baffles (12) away from the outer shell frame (11), and the air inlets (13), the air outlets (14) and the outer shell frame (11) are in communication.

3. The boiler low-temperature economizer according to claim 2, characterized in that: a liquid flow pipe (15) is installed in the outer shell frame (11) and penetrates the outer shell baffles (12), arrayed grading diaphragms (16) are installed on the liquid flow pipe (15) inside the outer shell frame (11), and the heights of the grading diaphragms (16) are lower than those of the outer shell baffles (12).

4. The boiler low-temperature economizer according to claim 2, characterized in that: the transmission structure (2) comprises a sealing cover (21) that is arrayed installed on the outer shell frame (11), a sliding sealing plate (22) is slidingly connected in the sealing cover (21), an outer transmission rod (23) is slidingly connected in the sliding sealing plate (22) at an edge position, and an inner transmission rod (24) is slidingly connected in the sliding sealing plate (22) at a middle position, and the outer transmission rod (23) or the inner transmission rod (24) is respectively rotationally connected with the transmission connecting plate (5).

5. The boiler low-temperature economizer according to claim 4, characterized in that: a horizontal transmission motor (27) is installed outside the sealing cover (21), a horizontal transmission rod (28) is threadedly connected in the horizontal transmission motor (27), a vertical transmission motor (25) is slidingly connected in the sealing cover (21), a limiting rotating ring (26) is installed on the side of the vertical transmission motor (25) close to the horizontal transmission motor (27), the horizontal transmission rod (28) rotates in the limiting rotating ring (26), and the vertical transmission motor (25) is respectively threadedly connected with the outer transmission rod (23) or the inner transmission rod (24).

6. The boiler low-temperature economizer of claim 1, wherein: The outer mounting frame (31) is provided with an outer limiting slide rod (35), the outer limiting slide rod (35) is provided with an outer sliding plate (36) connected through sliding, the outer sliding plate (36) and the outer mounting frame (31) are provided with an outer pressure spring (37) around the outer limiting slide rod (35), the side, away from the outer mounting frame (31), of the outer sliding plate (36) is provided with an outer sliding scraper (38), the outer sliding scraper (38) is provided with an outer rotating frame (39), and the outer rotating frame (39) and the outer sliding plate (36) are jointly provided with an outer sliding brush (310).

7. The boiler low-temperature economizer according to claim 6, characterized in that: The inner mounting frame (41) is provided with symmetrically distributed inner limiting slide rods (45), the inner limiting slide rods (45) are provided with inner sliding plates (46) connected through sliding, the inner sliding plates (46) and the inner mounting frame (41) are provided with inner pressure springs (47) around the inner limiting slide rods (45), the side, away from the inner mounting frame (41), of the inner sliding plate (46) is provided with an inner sliding scraper (48), the inner sliding scraper (48) is provided with an inner rotating frame (410), and the inner rotating frame (410) and the inner sliding plate (46) are both provided with an inner sliding brush (49).

8. The boiler low-temperature economizer according to claim 7, characterized in that: The width of the outer sliding scraper (38) is less than the width of the outer mounting frame (31), and the width of the inner sliding scraper (48) is less than the width of the inner mounting frame (41).

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