Energy-saving boiler economizer

Abstract

The invention relates to the technical field of boiler waste heat recovery equipment, in particular to an energy-saving boiler economizer which comprises an economizer body, the economizer body comprises a snakelike heat exchange pipe, a shell, a conical cover and a square pipe, and a beating plate is arranged on the bottom side of the snakelike heat exchange pipe. A flue gas circulation structure which extends into the shell and is used for flue gas circulation and reheating is arranged in the square pipe, and a self-cleaning linkage assembly and a collecting structure which are in linkage with the flue gas circulation structure are arranged outside the beating plate. The flue gas circulation structure comprises a rotating shaft rotationally connected to the interior of the square pipe, a fixing plate fixedly connected to the exterior of the square pipe and a rotating piece arranged in the shell. The energy-saving boiler economizer has the advantages of flue gas circulation reheating, self-cleaning linkage, accurate soot collection, working condition follow-up adjustment and the like, and the effects of improving the heat exchange efficiency, reducing the energy consumption, guaranteeing long-term stable operation of equipment and meeting the environmental protection requirement are achieved.

Description

Technical Field

[0001] This invention relates to the field of boiler waste heat recovery equipment technology, and in particular to an energy-saving boiler economizer. Background Technology

[0002] An economizer is a device installed at the bottom of the boiler flue to recover the waste heat of the exhaust gas. It heats the boiler feedwater to saturated water at the pressure of the steam drum. Because it absorbs the heat of the high-temperature flue gas, it reduces the exhaust temperature of the flue gas, saves energy, and improves efficiency, hence the name economizer.

[0003] In existing boiler economizer applications, flue gas typically flows through the economizer only once. The flue gas generated by boiler combustion carries a large amount of heat. When it passes through the economizer only once, the limited contact time and area between the flue gas and the heat exchange elements inside the economizer prevent the full absorption and utilization of the heat. Furthermore, as the flue gas flows through the outside of the serpentine tube, the uneven distribution of impurities in the flue gas, due to its flow characteristics, results in varying impurity adhesion at different points on the tube. This uneven impurity adhesion leads to inconsistent heat exchange efficiency across different parts of the serpentine tube, resulting in a decrease in overall heat exchange performance. Therefore, an energy-saving boiler economizer is proposed to address the aforementioned problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies and reduce problems such as low flue gas heat utilization rate, uneven ash accumulation in serpentine tubes leading to decreased heat exchange performance, and ash pollution, this invention provides an energy-saving boiler economizer. It features flue gas recirculation and reheating, self-cleaning linkage, precise ash collection, and dynamic adjustment of operating conditions, thereby improving heat exchange efficiency, reducing energy consumption, ensuring long-term stable operation of the equipment, and meeting environmental protection requirements.

[0005] This invention provides an energy-saving boiler economizer, which adopts the following technical solution: An energy-saving boiler economizer includes an economizer body, which comprises a serpentine heat exchange tube, a shell, a conical shroud, and a square tube. A beater plate is provided on the bottom side of the serpentine heat exchange tube. A flue gas circulation structure extending into the shell for flue gas recirculation and reheating is provided inside the square tube. A self-cleaning linkage component and a collection structure that are respectively linked to the flue gas circulation structure are provided outside the beater plate. The flue gas recirculation structure includes a rotating shaft rotatably connected inside the square tube, a fixed plate fixedly connected to the outside of the square tube, and a rotating component disposed inside the housing. The rotating component includes a limiting seat fixedly connected to the inner side wall of the housing and a bearing seat rotatably connected inside the limiting seat. A rotating tube extending into the housing is rotatably connected inside the bearing seat. A cam is fixedly connected to the outside of the rotating tube. A nozzle is fixedly connected to one end of the rotating tube. The self-cleaning linkage component includes a C-shaped seat fixedly connected to the outside of the limiting seat, a transmission rod and a moving rod slidably connected to the inside of the C-shaped seat, and a top block fixedly connected to one end of the transmission rod.

[0006] Optionally, a throat is fixedly connected inside the fixed plate, and tapered tubes are fixedly connected to both the upper and lower ends of the throat. An impeller is rotatably connected inside the top tapered tube. A check valve is fixedly connected to one side of the throat. A suction tube extending into the housing is fixedly connected to the outside of the check valve. A synchronous belt assembly is driven between the top end of the rotating shaft and the impeller. A wheel is fixedly connected to the outside of the rotating shaft. The wheel is rotatably connected inside the square tube and located at the connection between the square tube and the tapered cover.

[0007] The advantages of adopting the above-mentioned optional solutions are as follows: the rotating shaft is driven by the kinetic energy of the flue gas through the impeller, and the impeller is linked by the synchronous belt assembly to realize the autonomous circulation of flue gas; the cooperation between the throat pipe and the conical pipe improves the flue gas delivery efficiency; the check valve prevents the flue gas from flowing back; the suction pipe accurately recovers the flue gas in the shell, greatly improves the waste heat utilization rate, and has a significant energy-saving effect.

[0008] Optionally, a connecting seat is fixedly connected to the outside of the housing, the rotating tube is rotatably connected to the inside of the connecting seat, and a conveying pipe is fixedly connected between the tapered tube on the bottom side and the connecting seat.

[0009] The advantages of adopting the above-mentioned optional solutions are: the connecting seat plays an auxiliary positioning role for the rotating tube, and together with the limiting seat and bearing seat, it improves the rotational stability of the rotating tube, ensures that the flue gas is evenly sprayed through the nozzle, and further optimizes the reheating effect.

[0010] Optionally, a hinge seat is fixedly connected to the other end of the transmission rod, and a roller that abuts against the cam is rotatably connected inside the hinge seat. A return spring is fixedly connected between the hinge seat and the C-shaped seat, and the return spring is connected to the outside of the transmission rod.

[0011] The advantages of adopting the above-mentioned optional scheme are: the reciprocating motion of the transmission rod is realized through the contact between the cam and the roller and the action of the return spring, which provides power transmission for the self-cleaning function, and can effectively and timely clean the serpentine heat exchange tube by tapping, thus ensuring its heat exchange performance.

[0012] Optionally, a ball bearing that abuts against the upper surface of the top block is fixedly connected to the bottom end of the movable rod. A buffer spring is fixedly connected between the top of the ball bearing and the inner top wall of the C-shaped seat. A slide block is fixedly connected to the top of the C-shaped seat. A first inclined block is fixedly connected to the top end of the movable rod. A second inclined block is provided on the surface of the first inclined block. Both the first and second inclined blocks are slidably connected to the inside of the slide block. A horizontally arranged sliding groove is opened in the middle of the slide block. A pulley is slidably installed inside the sliding groove. The pulley is driven between the first and second inclined blocks.

[0013] The advantages of adopting the above-mentioned optional solutions are: by setting the ball bearings to reduce the friction between the top block and the moving rod, the buffer spring absorbs the transmission impact, realizes the vertical and horizontal power conversion, and enables the power of the moving rod to be stably transmitted to the subsequent components, providing support for efficient tapping and dust removal.

[0014] Optionally, a linkage block extending to the outside of the slide block is fixedly connected to one side of the first and second inclined blocks. The slide block has a limiting groove adapted to the linkage block inside. The linkage block is slidably connected inside the limiting groove. A connecting handle is fixedly connected between the bottom linkage block and the tapping plate. The tapping plate is located on the bottom side of the serpentine heat exchange tube.

[0015] The advantages of adopting the above-mentioned optional solution are: the design of the linkage block and connecting handle realizes the effective connection between the self-cleaning linkage component and the beater plate, and can accurately transmit the movement of the rotating part to the beater plate.

[0016] Optionally, a horizontal plate is fixedly connected to the top of the slide, and an abutment spring is fixedly connected between the horizontal plate and the second inclined block.

[0017] The advantages of adopting the above-mentioned optional solution are: by setting a retaining spring to provide a stable restoring force for the second inclined block, the second inclined block is ensured to reciprocate synchronously with the first inclined block, thereby improving the transmission continuity.

[0018] Optionally, the collection structure includes a mounting plate fixedly connected to the outside of the C-shaped base, a piston cylinder fixedly connected to the inside of the mounting plate, and a piston rod slidably connected to the inside of the piston cylinder. An L-shaped plate is fixedly connected to the top of the piston rod, and the L-shaped plate is fixedly connected to the top linkage block to realize the force-enhancing linkage between the self-cleaning linkage component and the collection structure.

[0019] The beneficial effects of adopting the above-mentioned optional scheme are: through the connection between the piston rod and the linkage block, the collection structure can collect soot with the help of the power of the self-cleaning linkage component, realizing the integration and collaborative work of functions.

[0020] Optionally, a suction pipe is fixedly connected to one side of the piston cylinder, and a discharge pipe is fixedly connected to the other side of the piston cylinder. A one-way valve is fixedly connected inside both the suction pipe and the discharge pipe. One end of the suction pipe extends into the interior of the beater plate, and a material-holding hole is provided inside the beater plate to realize the adsorption, conveying and collection of ash.

[0021] The advantages of adopting the above-mentioned optional scheme are: by opening the material collection hole inside the beater plate, the soot can be collected nearby, reducing the transfer path and avoiding secondary pollution.

[0022] Optionally, the economizer body also includes a cover plate detachably connected to the top of the shell, and an inlet pipe and an outlet pipe respectively fixedly connected to both ends of the serpentine heat exchange tube. The inlet pipe and the outlet pipe both extend to the upper surface of the shell, and the spray direction of the nozzle is towards the serpentine heat exchange tube to improve the uniformity of flue gas circulation and reheating.

[0023] The beneficial effects of adopting the above-mentioned optional scheme are: the flue gas is evenly covered by the nozzles, which greatly improves the uniformity and efficiency of reheating.

[0024] In summary, the present invention has at least one of the following beneficial technical effects: 1. This invention utilizes flue gas to drive the rotation of a wheel outside the rotating shaft. The impeller, driven by a synchronous belt assembly, rotates within the throat tube, generating negative pressure that draws the flue gas through the suction pipe, then through the conveying pipe to the rotating tube, and finally out through nozzles facing the serpentine heat exchange tube. This allows the flue gas to circulate and reheat within the economizer body. The serpentine heat exchange tube can fully absorb the heat from the flue gas, greatly improving heat exchange efficiency, effectively reducing boiler energy consumption, and achieving efficient energy utilization.

[0025] 2. In this invention, when the flue gas circulation structure is running, the cam on the rotating tube rotates and abuts against the roller on the transmission rod in the self-cleaning linkage component, pushing the transmission rod to move. This, in turn, drives the top block, rolling ball, etc., to drive the tapping plate to tap the serpentine heat exchange tube, realizing the automatic triggering of the cleaning action during the flue gas circulation process. This promptly removes the dust on the surface of the serpentine heat exchange tube, ensuring its heat exchange performance, reducing equipment failures caused by dust accumulation, and extending the service life of the equipment.

[0026] 3. In this invention, when the self-cleaning linkage component moves, the top linkage block drives the L-shaped plate and piston rod to slide inside the piston cylinder of the collection structure. Under the action of the one-way valve, the ash suction pipe draws the soot from the material holding hole of the beater plate into the piston cylinder, and then discharges it through the ash discharge pipe. This allows the soot generated during the self-cleaning process to be collected and treated accurately and in a timely manner, avoiding secondary pollution of the serpentine heat exchange tube by soot, reducing dust emissions, meeting environmental protection requirements, and contributing to the long-term stable operation of the equipment.

[0027] 4. In this invention, when the flue gas intake increases, the flue gas circulation structure operates faster, the rotation speed of the rotating tube increases, the cam rotation speed increases, and the frequency of the transmission rod of the self-cleaning linkage component increases. This, in turn, increases the frequency of the tapping plate tapping the serpentine heat exchange tube, thus promptly cleaning up dust that may accumulate rapidly due to the increased flue gas volume. At the same time, the increased frequency of the self-cleaning linkage component also drives the sliding frequency of the piston rod in the collection structure to increase, accelerating the adsorption and discharge speed of soot. The adaptive adjustment capability allows the economizer to better adapt to different working conditions and always maintain a highly efficient and stable operating state. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a three-dimensional view of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4 This is a cross-sectional view of the flue gas recirculation structure of the present invention; Figure 5 This is a schematic diagram of the rotating component, the tapping plate, and the self-cleaning linkage assembly of the present invention; Figure 6 This is a schematic diagram of the self-cleaning linkage component of the present invention; Figure 7 This is a schematic diagram of the self-cleaning linkage component and collection structure of the present invention; Figure 8 This is a schematic diagram of the self-cleaning linkage component of the present invention; Figure 9 This is a cross-sectional view of the structure collected by the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Economizer body; 11. Serpentine heat exchange tube; 12. Shell; 13. Cover plate; 14. Conical shroud; 15. Square tube; 16. Inlet pipe; 17. Outlet pipe; 2. Beating plate; 3. Flue gas circulation structure; 31. Rotating shaft; 32. Rotating wheel; 33. Fixing plate; 34. Throat; 35. Conical tube; 36. Impeller; 37. Check valve; 38. Suction pipe; 39. Synchronous belt assembly; 310. Rotating component; 301. Conveying pipe; 302. Limiting seat; 303. Bearing seat; 304. Rotating tube; 305. Connecting seat; 306. Cam; 307. Nozzle 4. Self-cleaning linkage assembly; 41. C-shaped seat; 42. Transmission rod; 43. Top block; 44. Hinge seat; 45. Roller; 46. Return spring; 47. Moving rod; 48. Ball; 49. Buffer spring; 410. First inclined block; 411. Pulley; 412. Second inclined block; 413. Linkage block; 414. Connecting handle; 415. Slide seat; 416. Abutment spring; 5. Collection structure; 51. Mounting plate; 52. Piston cylinder; 53. Piston rod; 54. L-shaped plate; 55. One-way valve; 56. Dust suction pipe; 57. Dust discharge pipe; 58. Material collection hole. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 9 The present invention will be further described in detail below.

[0031] This invention discloses an energy-saving boiler economizer. Please refer to [link / reference]. Figures 1 to 4 An energy-saving boiler economizer includes an economizer body 1, which comprises a serpentine heat exchange tube 11, a shell 12, a conical shroud 14, and a square tube 15. A beater plate 2 is provided on the bottom side of the serpentine heat exchange tube 11. A flue gas circulation structure 3, extending into the shell 12 for flue gas recirculation and reheating, is provided inside the square tube 15. A self-cleaning linkage component 4 and a collection structure 5, respectively linked to the flue gas circulation structure 3, are provided outside the beater plate 2. The flue gas circulation structure 3 includes a rotating shaft 31 rotatably connected inside the square tube 15, a fixing plate 33 fixedly connected to the outside of the square tube 15, and a rotating component 310 disposed inside the shell 12. The serpentine heat exchange tube 11 is fixedly connected to the inside of the shell 12, and heat exchange plates are fixedly connected to the outside of the serpentine heat exchange tube 11. The conical shroud 14 is fixedly connected to the outside of the shell 12, and the square tube 15 is fixedly connected to the end of the conical shroud 14 away from the shell 12. The square tube 15 can be connected to the boiler exhaust pipe via a flange.

[0032] Specifically, in order to achieve the effect of self-circulation and reheating of flue gas and improve the utilization rate of waste heat, a throat pipe 34 is fixedly connected inside the fixed plate 33. Both the upper and lower ends of the throat pipe 34 are fixedly connected to a conical pipe 35. An impeller 36 is rotatably connected inside the top conical pipe 35. A check valve 37 is fixedly connected to one side of the throat pipe 34. A suction pipe 38 extending into the housing 12 is fixedly connected to the outside of the check valve 37. A synchronous belt assembly 39 is driven between the top of the rotating shaft 31 and the impeller 36. A wheel 32 is fixedly connected to the outside of the rotating shaft 31. The wheel 32 is rotatably connected inside the square tube 15 and is located at the connection between the square tube 15 and the conical cover 14. By using the kinetic energy of the flue gas itself to drive the rotor 32 to rotate, the impeller 36 is linked by the rotating shaft 31 and the synchronous belt assembly 39 to form a circulating power; the check valve 37 can prevent the flue gas from flowing back, the suction pipe 38 accurately recovers the low-temperature flue gas in the shell 12, and the throat pipe 34 and the conical pipe 35 optimize the flue gas flow path, greatly improving the waste heat recovery efficiency and reducing energy waste.

[0033] It should be noted that, in order to ensure the uniformity of flue gas circulation and injection, the rotating component 310 includes a limiting seat 302 fixedly connected to the inner wall of the housing 12 and a bearing seat 303 rotatably connected inside the limiting seat 302. A rotating tube 304 extending into the housing 12 is rotatably connected inside the bearing seat 303. A cam 306 is fixedly connected to the outside of the rotating tube 304, and a nozzle 307 is fixedly connected to one end of the rotating tube 304. The limiting seat 302 and the bearing seat 303 cooperate to provide dual positioning for the rotating tube 304, reducing the offset during rotation and improving operational stability. The nozzle 307 at one end of the rotating tube 304 can directionally inject circulating flue gas into the serpentine heat exchange tube 11. Simultaneously, the cam 306 provides power to the subsequent self-cleaning linkage component 4, realizing the sharing of flue gas circulation and self-cleaning power, and improving energy utilization.

[0034] It is worth mentioning that, in order to achieve a closed-loop flue gas circulation channel and improve circulation efficiency, a connecting seat 305 is fixedly connected to the outside of the shell 12, and a rotating tube 304 is rotatably connected to the inside of the connecting seat 305. A conveying pipe 301 is fixedly connected between the bottom tapered tube 35 and the connecting seat 305. The conveying pipe 301 connects the bottom tapered tube 35 and the connecting seat 305, forming a complete closed-loop flue gas circulation, so that the flue gas after heat exchange through the serpentine heat exchange tube 11 can flow smoothly back to the throat tube 34 for recirculation. The connecting seat 305 further strengthens the support stability of the rotating tube 304, preventing it from shaking due to flue gas pressure, ensuring the sealing and continuity of the circulation channel, and improving the overall flue gas circulation efficiency.

[0035] Please see Figures 5 to 9In order to achieve stable transmission of self-cleaning power and realize the linkage effect between structures, in this embodiment, the self-cleaning linkage component 4 includes a C-shaped seat 41 fixedly connected to the outside of the limiting seat 302, a transmission rod 42 and a moving rod 47 respectively slidably connected to the inside of the C-shaped seat 41, and a top block 43 fixedly connected to one end of the transmission rod 42.

[0036] Specifically, to ensure the stable reciprocating motion of the transmission rod 42, a hinge seat 44 is fixedly connected to the other end of the transmission rod 42. A roller 45, which abuts against the cam 306, is rotatably connected inside the hinge seat 44. A return spring 46 is fixedly connected between the hinge seat 44 and the U-shaped seat 41, and the return spring 46 is wrapped around the outside of the transmission rod 42. By using a rolling contact method between the roller 45 and the cam 306, friction loss between them is significantly reduced, improving power transmission efficiency. The return spring 46 can automatically reset the transmission rod 42 as the cam 306 rotates, ensuring the continuous and stable reciprocating motion of the transmission rod 42, adapting to the requirements of long-term high-frequency operation, and improving the durability of the self-cleaning structure.

[0037] It should be noted that, in order to achieve the effects of power direction conversion and buffering transmission impact, a ball 48 is fixedly connected to the bottom end of the moving rod 47 and abuts against the upper surface of the top block 43. A buffer spring 49 is fixedly connected between the top of the ball 48 and the inner top wall of the C-shaped seat 41. A slide block 415 is fixedly connected to the top of the C-shaped seat 41. A first inclined block 410 is fixedly connected to the top end of the moving rod 47. A second inclined block 412 is provided on the surface of the first inclined block 410. The first inclined block 410 and the second inclined block 412 are both slidably connected to the inside of the slide block 415. A horizontally arranged slide groove is opened in the middle of the slide block 415. A pulley 411 is slidably installed inside the slide groove. The pulley 411 is driven between the first inclined block 410 and the second inclined block 412. By setting the ball 48, the contact friction between the top block 43 and the moving rod 47 is reduced, thus reducing power loss; the buffer spring 49 can absorb the impact load during the transmission process and prevent the components from being damaged by rigid collisions; through the cooperation of the first inclined block 410, the second inclined block 412 and the pulley 411, the vertical power is smoothly converted to the horizontal power; the slide block 415 and the slide groove ensure the accuracy of sliding and improve the stability and reliability of power transmission.

[0038] It is worth mentioning that, in order to ensure the self-cleaning effect, a linkage block 413 extending to the outside of the slide block 415 is fixedly connected to one side of the first inclined block 410 and the second inclined block 412. The slide block 415 has a limiting groove that matches the linkage block 413. The linkage block 413 is slidably connected inside the limiting groove. A connecting handle 414 is fixedly connected between the bottom linkage block 413 and the tapping plate 2. The tapping plate 2 is located on the bottom side of the serpentine heat exchange tube 11. The movement trajectory can be restricted by the cooperation between the linkage block 413 and the limiting groove to avoid transmission deviation. The connecting handle 414 stably transmits the power of the linkage block 413 to the tapping plate 2, so that the tapping plate 2 can accurately act on the bottom side of the serpentine heat exchange tube 11, shake off the surface dust, and ensure the heat exchange efficiency of the serpentine heat exchange tube 11. At the same time, the tapping plate 2 and the serpentine heat exchange tube 11 are precisely aligned to avoid damage to the serpentine heat exchange tube 11.

[0039] In addition, to ensure the continuous effect of self-cleaning linkage, a horizontal plate is fixedly connected to the top of the slide 415, and an abutment spring 416 is fixedly connected between the horizontal plate and the second inclined block 412.

[0040] Please see Figures 6 to 9 To achieve the effect of linking self-cleaning and ash collection and improving ash handling efficiency, in this embodiment, the collection structure 5 includes a mounting plate 51 fixedly connected to the outside of the U-shaped base 41, a piston cylinder 52 fixedly connected to the inside of the mounting plate 51, and a piston rod 53 slidably connected to the inside of the piston cylinder 52. An L-shaped plate 54 is fixedly connected to the top of the piston rod 53, and the L-shaped plate 54 is fixedly connected to the top linkage block 413, realizing the force-enhancing linkage between the self-cleaning linkage component 4 and the collection structure 5. The power of the self-cleaning linkage component 4 is transmitted to the collection structure 5 through the L-shaped plate 54, so that the cleaning and collection actions are performed synchronously. The transmission cooperation of the pulley 411, the second inclined block 412 and the L-shaped plate 54 plays a force-enhancing role, increasing the driving force of the piston rod 53, ensuring the structural stability during the linkage process and improving the overall working efficiency.

[0041] Specifically, to achieve the effects of directional adsorption, conveying, and centralized collection of flue ash, a suction pipe 56 is fixedly connected to one side of the piston cylinder 52, and a discharge pipe 57 is fixedly connected to the other side of the piston cylinder 52. Both the suction pipe 56 and the discharge pipe 57 are fixedly connected to a one-way valve 55. One end of the suction pipe 56 extends into the interior of the beater plate 2, which has a material-collecting hole 58 to achieve the adsorption, conveying, and collection of flue ash. The discharge pipe 57 can be connected to an external collection box or filter box, facilitating subsequent centralized processing or filtration and purification of the collected flue ash. Connecting the discharge pipe 57 to an external collection box or filter box further improves the flue ash treatment process, avoids flue ash accumulation or secondary pollution, and reduces the difficulty of subsequent cleaning.

[0042] It should be noted that the economizer body 1 also includes a cover plate 13 detachably connected to the top of the shell 12, and an inlet pipe 16 and an outlet pipe 17 respectively fixedly connected to both ends of the serpentine heat exchange tube 11. Both the inlet pipe 16 and the outlet pipe 17 extend to the upper surface of the shell 12, and the nozzle 307 sprays towards the serpentine heat exchange tube 11 to improve the uniformity of flue gas circulation and reheating. The detachable cover plate 13 facilitates the inspection and maintenance of components such as the flue gas circulation structure 3 and the self-cleaning linkage component 4 inside the shell 12; the inlet pipe 16 and the outlet pipe 17 extend to the upper surface of the shell 12 to facilitate pipeline connection and maintenance; the nozzle 307 is oriented towards the serpentine heat exchange tube 11 to ensure that the flue gas evenly covers the surface of the heat exchange tube, improves the uniformity of reheating and heat exchange efficiency, and further enhances the energy-saving effect.

[0043] Combined with appendix Figures 1 to 9 The working principle of the above embodiments is as follows: First, the economizer is connected to the boiler exhaust pipe through the flange at the end of the square tube 15. The high-temperature flue gas discharged from the boiler is introduced into the square tube 15 through the conical shroud 14. When the flue gas flows through the connection between the square tube 15 and the conical shroud 14, the self-energizing energy of the flue gas directly acts on the impeller 32, driving the impeller 32 to drive the coaxial rotating shaft 31 to rotate inside the square tube 15. The rotating shaft 31 transmits power to the impeller 36 inside the conical tube 35 at the top of the throat 34 on the fixed plate 33 through the synchronous belt assembly 39. The impeller 36 rotates at high speed and works with the throat 34 to form a negative pressure adsorption effect. Driven by this effect, the low-temperature flue gas that has completed the initial heat exchange with the serpentine heat exchange tube 11 inside the shell 12 is precisely drawn into the throat 34 through the suction tube 38. Then, the low-temperature flue gas flows downward along the throat 34, is transported to the connecting seat 305 through the bottom conical tube 35 and the conveying tube 301, and finally enters the interior of the rotating tube 304, forming a preliminary circulation link of high-temperature flue gas introduction, low-temperature flue gas recovery, and circulating flue gas conveying. The rotating tube 304 rotates smoothly under the propulsion of the circulating flue gas and the dual positioning support of the limiting seat 302 and the bearing seat 303. On the one hand, the circulating flue gas is directionally sprayed onto the surface of the serpentine heat exchange tube 11 through the nozzle 307 at one end, realizing the secondary or even multiple circulation and reheating of the flue gas waste heat and improving the heat exchange efficiency. On the other hand, the cam 306 fixed outside the rotating tube 304 rotates synchronously. With the abutting cooperation between the cam 306 and the self-cleaning linkage component 4, the cam 306 protrusion makes rolling contact with the roller 45 in the hinge seat 44, pushing the transmission rod 42 to slide along the C-shaped seat 41 towards the moving rod 47. At this time, the return spring 46 surrounding the transmission rod 42 is compressed and stored energy. When the cam 306 protrusion disengages from the roller 45, the return spring 46 releases the stored energy and pulls the transmission rod 42 to return to its original position, forming the continuous reciprocating motion of the transmission rod 42. When the transmission rod 42 reciprocates, the top block 43 at one end moves back and forth synchronously. The top block 43 abuts against the ball 48 at the bottom of the moving rod 47, converting the horizontal reciprocating power into the vertical reciprocating power of the moving rod 47. The first inclined block 410 at the top of the moving rod 47 moves vertically synchronously with the moving rod 47. Through the pulley 411 in the slide groove of the slide block 415, it is driven to cooperate with the second inclined block 412, further converting the vertical power into the up-down horizontal reciprocating power of the second inclined block 412. The linkage block 413 outside the first inclined block 410 and the second inclined block 412 slides horizontally synchronously with the inclined blocks. The bottom linkage block 413 drives the tapping plate 2 to reciprocate towards or away from the serpentine heat exchange tube 11 through the connecting handle 414, accurately tapping the bottom side of the serpentine heat exchange tube 11, shaking off the surface dust, and completing the self-cleaning action. While the second inclined block 412 slides horizontally back and forth, the top linkage block 413 drives the piston rod 53 of the collection structure 5 to reciprocate synchronously in the piston cylinder 52 through the L-shaped plate 54, realizing the linkage of cleaning collection; when the piston rod 53 extends outward, a negative pressure is formed inside the piston cylinder 52, and the ash shaken off by the ash suction pipe 56 extending into the inside of the slapping plate 2 is sucked into the piston cylinder 52; when the piston rod 53 retracts inward, the pressure inside the piston cylinder 52 increases, and the ash is discharged through the ash discharge pipe 57. The discharged ash can be connected to an external collection box or filter box for centralized treatment through the ash discharge pipe 57, completing the closed loop of ash collection; Throughout the entire process, the inlet pipe 16 continuously supplies cold water to the serpentine heat exchange tube 11. After the cold water and circulating flue gas complete sufficient heat exchange through the serpentine heat exchange tube 11 and heat exchange plates, the water is discharged through the outlet pipe 17, thus realizing the core function of energy-saving heating.

[0044] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An energy-saving boiler economizer, comprising an economizer body (1), characterized in that: The main body (1) of the economizer consists of a serpentine heat exchange tube (11), a shell (12), a conical shroud (14) and a square tube (15). A tapping plate (2) is provided on the bottom side of the serpentine heat exchange tube (11). A flue gas circulation structure (3) extending into the shell (12) for flue gas circulation and reheating is provided inside the square tube (15). A self-cleaning linkage component (4) and a collection structure (5) are provided on the outside of the tapping plate (2) respectively linked with the flue gas circulation structure (3). The flue gas recirculation structure (3) includes a rotating shaft (31) rotatably connected inside the square tube (15), a fixed plate (33) fixedly connected outside the square tube (15), and a rotating component (310) disposed inside the housing (12). The rotating component (310) includes a limiting seat (302) fixedly connected to the inner wall of the housing (12) and a bearing seat (303) rotatably connected inside the limiting seat (302). A rotating tube (304) extending into the housing (12) is rotatably connected inside the bearing seat (303). A cam (306) is fixedly connected to the outside of the rotating tube (304). A nozzle (307) is fixedly connected to one end of the rotating tube (304). The self-cleaning linkage component (4) includes a C-shaped seat (41) fixedly connected to the outside of the limiting seat (302), a transmission rod (42) slidably connected to the inside of the C-shaped seat (41), and a moving rod (47). One end of the transmission rod (42) is fixedly connected to a top block (43).

2. The energy-saving boiler economizer according to claim 1, characterized in that: The fixed plate (33) is fixedly connected to the inside of the throat tube (34), and the upper and lower ends of the throat tube (34) are fixedly connected to the tapered tube (35). The top tapered tube (35) is rotatably connected to the inside of the top tapered tube (35). The outside of the throat tube (34) is fixedly connected to the check valve (37). The outside of the check valve (37) is fixedly connected to the suction tube (38) extending into the inside of the housing (12). The top of the rotating shaft (31) and the impeller (36) are connected by a synchronous belt assembly (39). The outside of the rotating shaft (31) is fixedly connected to the wheel (32). The wheel (32) is rotatably connected to the inside of the square tube (15) and is located at the connection between the square tube (15) and the tapered cover (14).

3. The energy-saving boiler economizer according to claim 2, characterized in that: The outer side of the housing (12) is fixedly connected to a connecting seat (305), the rotating tube (304) is rotatably connected to the inside of the connecting seat (305), and a conveying tube (301) is fixedly connected between the tapered tube (35) on the bottom side and the connecting seat (305).

4. The energy-saving boiler economizer according to claim 1, characterized in that: The other end of the transmission rod (42) is fixedly connected to a hinge seat (44). The hinge seat (44) is rotatably connected to a roller (45) that abuts against the cam (306). A return spring (46) is fixedly connected between the hinge seat (44) and the C-shaped seat (41). The return spring (46) is connected around the outside of the transmission rod (42).

5. The energy-saving boiler economizer according to claim 1, characterized in that: The bottom end of the moving rod (47) is fixedly connected to a ball (48) that abuts against the upper surface of the top block (43). A buffer spring (49) is fixedly connected between the top of the ball (48) and the inner top wall of the C-shaped seat (41). A slide block (415) is fixedly connected to the top of the C-shaped seat (41). A first inclined block (410) is fixedly connected to the top of the moving rod (47). A second inclined block (412) is provided on the surface of the first inclined block (410). The first inclined block (410) and the second inclined block (412) are slidably connected to the inside of the slide block (415). A horizontally arranged sliding groove is opened in the middle of the slide block (415). A pulley (411) is slidably installed inside the sliding groove. The pulley (411) is driven between the first inclined block (410) and the second inclined block (412).

6. The energy-saving boiler economizer according to claim 5, characterized in that: The first inclined block (410) and the second inclined block (412) are both fixedly connected to a linkage block (413) extending to the outside of the slide block (415). The slide block (415) has a limiting groove adapted to the linkage block (413) inside. The linkage block (413) is slidably connected inside the limiting groove. A connecting handle (414) is fixedly connected between the bottom linkage block (413) and the tapping plate (2). The tapping plate (2) is located on the bottom side of the serpentine heat exchange tube (11).

7. An energy-saving boiler economizer according to claim 6, characterized in that: A horizontal plate is fixedly connected to the top of the slide (415), and an abutment spring (416) is fixedly connected between the horizontal plate and the second inclined block (412).

8. An energy-saving boiler economizer according to claim 6, characterized in that: The collecting structure (5) includes a mounting plate (51) fixedly connected to the outside of the C-shaped seat (41), a piston cylinder (52) fixedly connected to the inside of the mounting plate (51), and a piston rod (53) slidably connected to the inside of the piston cylinder (52). An L-shaped plate (54) is fixedly connected to the top of the piston rod (53). The L-shaped plate (54) is fixedly connected to the top linkage block (413) to realize the force-enhancing linkage between the self-cleaning linkage component (4) and the collecting structure (5).

9. An energy-saving boiler economizer according to claim 8, characterized in that: One side of the piston cylinder (52) is fixedly connected to a suction pipe (56), and the other side of the piston cylinder (52) is fixedly connected to a discharge pipe (57). Both the suction pipe (56) and the discharge pipe (57) are fixedly connected to a one-way valve (55). One end of the suction pipe (56) extends into the interior of the beater plate (2). The beater plate (2) has a material holding hole (58) inside, so as to realize the adsorption, conveying and collection of smoke ash.

10. An energy-saving boiler economizer according to claim 1, characterized in that: The economizer body (1) also includes a cover plate (13) detachably connected to the top of the shell (12), and an inlet pipe (16) and an outlet pipe (17) respectively fixedly connected to both ends of the serpentine heat exchange tube (11). The inlet pipe (16) and the outlet pipe (17) both extend to the upper surface of the shell (12). The nozzle (307) sprays towards the serpentine heat exchange tube (11) to improve the uniformity of flue gas circulation and reheating.

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