An integral spiral fin tube for thermal power generation

Abstract

The present invention discloses an integral spiral fin tube for thermal power generation, which relates to the technical field of spiral fin tubes, and comprises an outer tube that can be installed between economizer fixing plates, wherein the inner wall of the outer tube is integrally formed with an inner tube, and the outer wall of the outer tube is integrally formed with spiral fins, and the outer wall of the spiral fin is provided with multiple groups of concave holes, and further comprises a sliding block installed in the concave hole, and the sliding block has two states, state one, the sliding block extends out of the concave hole, and state two, the sliding block retracts into the concave hole. The present invention switches the sliding block back and forth between the two states through a driving component, so that the sliding block can increase the surface area of ​​the spiral fin when the concave hole is retracted, thereby improving the heat exchange efficiency, and when ash is accumulated in the concave hole, the ash accumulated in the concave hole is cleaned by extending the sliding block, thereby preventing the ash layer from reducing the heat exchange rate between the high-temperature flue gas and the inner wall of the concave hole, and retracting the sliding block after cleaning to continue to increase the surface area of ​​the spiral fin.

Description

Technical Field

[0001] The invention relates to the technical field of spiral finned tubes, in particular to an integral spiral finned tube for thermal power generation. Background Art

[0002] Spiral fin tubes are a type of high-efficiency heat transfer element with spiral fins that can significantly increase the heat transfer area and improve the heat transfer effect. Spiral fin tubes are widely used in boiler economizers, air preheaters, heat recovery of waste heat boilers, and heat exchange equipment in various fields such as chemical industry and pressure vessels. Their advantages include large heat transfer area, small structure volume, and strong earthquake resistance.

[0003] For example, Chinese patent No. CN117588986A discloses an integral spiral fin tube with a concave surface, including a base tube and fins, wherein the fins are spirally shaped and continuously arranged on the outer wall of the base tube along the axial direction of the tube, and the fins are perpendicular to the outer wall of the base tube; the fin cross-section is trapezoidal, and the fin top thickness is less than the fin root thickness, wherein the fin top thickness is the fin thickness at the end of the fin away from the base tube surface, and the fin root thickness is the fin thickness at the connection between the fin and the base tube; concave holes are machined on the fin surface, the concave holes do not penetrate the fins, and the depth of the concave holes is 0.1 to 0.8 times the thickness of the fin at the center of the concave holes; the distribution of the concave holes along the spiral fin surface is circumferentially uniform or circumferentially non-uniform. The invention improves the heat transfer performance and anti-dust accumulation performance of the spiral fin tube by machining concave holes on the fin surface.

[0004] However, when the above-mentioned spiral fins are in use, the flue gas in the flue will form a low-speed vortex in the recess after flowing through the recess, so that the small solid particles carried by the vortex are easily accumulated in the recess, covering the inner wall of the recess, thereby reducing the heat transfer efficiency between the high-temperature flue gas and the inner wall of the recess. In addition, due to the large number of recesses, it is extremely difficult to clean the dust accumulated in the recesses. After long-term use, not only will the heat transfer efficiency of the spiral fins be lower than that of ordinary spiral fins, but the excessive dust accumulation will also affect the subsequent harmless treatment of the high-temperature flue gas. Summary of the invention

[0005] The object of the present invention is to provide an integral spiral fin tube for thermal power generation to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: an integral spiral fin tube for thermal power generation, comprising an outer tube that can be installed between economizer fixing plates, the inner wall of the outer tube is integrally formed with an inner tube, the outer wall of the outer tube is integrally formed with spiral fins, and the outer wall of the spiral fin is provided with multiple groups of concave holes;

[0007] Also included is a sliding block installed in the concave hole, the sliding block has two states, in state one, the sliding block extends out of the concave hole, and the end surface of the sliding block is higher than the curved surface of the spiral fin, and in state two, the sliding block is retracted into the concave hole, and the end surface of the sliding block is lower than the curved surface of the spiral fin;

[0008] It also includes a driving component, which is used to drive the sliding block to switch back and forth between state one and state two.

[0009] Preferably, the driving assembly comprises a spiral pipe opened in the spiral fin, an expansion pipe is arranged in the spiral pipe, the outer wall of the expansion pipe is fixedly connected to the outer wall of the sliding block, a piston box is fixedly installed on the side wall of the fixed plate, the part of the expansion pipe passing through the spiral fin is connected to the piston box through the fixed pipe, and the expansion pipe and the piston box are filled with heat-conducting medium, a piston plate is slidably installed in the piston box, and a connecting rod is fixed on the side wall of the piston plate;

[0010] Also included is a driving mechanism, which is used to drive the connecting rod to move reciprocally.

[0011] Preferably, the driving mechanism includes two groups of fixed frames fixed on the side walls of the fixed plate, an electromagnet is provided in the fixed frame, a fixed shaft is fixedly installed between the two groups of fixed frames, a slider is slidably installed on the outer wall of the fixed shaft, and magnets are provided on both sides of the slider, and the end of the connecting rod is fixed on the slider.

[0012] Preferably, a metal sheet is provided on the top surface of the sliding block, metal wires are fixedly connected to both sides of the metal sheet, the metal wires are connected to an external circuit and a current detection device, and the current detection device is electrically connected to the electromagnet.

[0013] Preferably, the electromagnet is electrically connected to the external control unit.

[0014] Preferably, the parts of the two groups of inner tubes passing through the fixed plate are fixedly connected with a connecting tube, one section of the connecting tube is set as a fixed sleeve, a rotating core is rotatably installed in the fixed sleeve 7, and a through hole is opened in the rotating core to enable the connecting tube to communicate;

[0015] The utility model also comprises a rotating assembly, wherein the rotating assembly is used for driving the rotating core to reciprocate in the fixed sleeve.

[0016] Preferably, the rotating assembly includes a rotating shaft fixed to the side wall of the rotating core, a rotating plate is fixedly installed on the outer wall of the rotating shaft, one end of the rotating plate away from the rotating shaft is fixedly connected to a tension spring, one end of the tension spring is fixedly connected to the outer wall of the slider, and the connection point between the tension spring and the rotating plate is located below the rotating core.

[0017] Preferably, the end surface of the sliding block is set as a windward inclined surface.

[0018] Preferably, the expansion tube has a rectangular cross-section, and the narrow sides on both sides are made of hard materials, while the long sides are made of soft materials.

[0019] Preferably, the outer wall of the spiral fin is configured as a curved surface which is thick at both ends and thin in the middle.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention switches the sliding block back and forth between two states through a driving component, so that the sliding block can increase the surface area of ​​the spiral fin when retracting the concave hole, thereby improving the heat exchange efficiency. When ash is accumulated in the concave hole, the ash in the concave hole can be cleaned by extending the sliding block to prevent the ash layer from reducing the heat exchange rate between the high-temperature flue gas and the inner wall of the concave hole. After cleaning, the sliding block is retracted to continue to increase the surface area of ​​the spiral fin.

[0022] 2. The present invention can quickly reduce the aperture in the fixed sleeve so that the suddenly stopped water flow can impact the inner wall of the upper group of inner tubes, shake off the water stains on the inner wall of the inner tube, and avoid the water stains reducing the heat transfer efficiency between the circulating water flow in the inner tubes. The vibration generated by the water hammer effect can shake off the small solid particles on the spiral fins and the outer wall of the outer tube, clean the spiral fins and the outer wall of the outer tube, and further improve the heat conduction efficiency between the high-temperature flue gas and the circulating water.

[0023] 3. In the present invention, the movement of the slider drives the piston plate to move in the piston box, squeezing the heat-conducting medium into the expansion tube to achieve the purpose of extending the sliding block. Due to the delay effect produced by the tension spring, the sliding block is extended earlier than the rotation of the rotating core. In this way, the vibration generated by the water hammer effect in the inner tube can be used to improve the cleaning effect of the ash layer in the concave hole, thereby improving the heat exchange rate between the spiral fins and the high-temperature air. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A top view of the present invention;

[0025] Figure 2 It is a top view cross-sectional view of the present invention;

[0026] Figure 3 is a cross-sectional view of the spiral fin of the present invention;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the spiral fin of the present invention;

[0028] Figure 5 It is a three-dimensional structural schematic diagram of the driving assembly of the present invention;

[0029] Figure 6 is a cross section of the drive assembly of the present invention;

[0030] Figure 7 is a cross-sectional view of the connecting pipe of the present invention;

[0031] Figure 8 It is a three-dimensional schematic diagram of the metal sheet and its related structures of the present invention;

[0032] Fig. 9 A simplified block diagram of the second control method for starting the electromagnet of the present invention;

[0033] Fig.10 It is a cross-sectional view of the spiral fin of the present invention in the second state.

[0034] In the figure: 1. fixed plate; 2. outer tube; 3. spiral fin; 4. concave hole; 5. inner tube; 6. connecting tube; 7. fixed sleeve; 8. sliding block; 9. expansion tube; 10. piston box; 11. fixed tube; 12. fixed frame; 13. slider; 14. connecting rod; 15. tension spring; 16. fixed shaft; 17. electromagnet; 18. piston plate; 19. metal wire; 20. metal sheet; 21. control unit; 22. rotating plate; 23. rotating shaft; 24. rotating core. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 10 The present invention provides a technical solution: an integral spiral fin tube for thermal power generation, comprising an outer tube 2 that can be installed between economizer fixing plates 1, an inner tube 5 is integrally formed on the inner wall of the outer tube 2, a spiral fin 3 is integrally formed on the outer wall of the outer tube 2, and a plurality of groups of concave holes 4 are provided on the outer wall of the spiral fin 3;

[0037] It also includes a sliding block 8 installed in the concave hole 4, and the sliding block 8 has two states. In state one, the sliding block 8 extends out of the concave hole 4, and the end surface of the sliding block 8 is higher than the curved surface of the spiral fin 3. In state two, the sliding block 8 is retracted into the concave hole 4, and the end surface of the sliding block 8 is lower than the curved surface of the spiral fin 3.

[0038] It also includes a driving component, which is used to drive the sliding block 8 to switch back and forth between state one and state two.

[0039] Economizer is a device installed at the lower part of the flue at the rear of the boiler to recover the waste heat of the exhaust gas. The economizer is generally fixed by a supporting structure to the heating tubes in the economizer. The pipes are connected to the external water circulation equipment, so that the circulating water in the heating tubes absorbs and utilizes the heat in the high-temperature flue gas, and then the heat exchange area is increased through the fins on the outer wall of the heating tubes to improve the heat exchange efficiency.

[0040] Among them, the spiral fin is a high-efficiency heat transfer element. The spiral fin has a higher surface area, which can significantly increase the heat exchange area and improve the heat transfer effect. In Chinese patent CN117588986A, the heat exchange area of ​​the spiral fin is further increased by opening a cavity on the surface of the spiral fin, so as to achieve the purpose of increasing the heat exchange rate between the high-temperature flue gas and the circulating water. However, after the high-temperature flue gas in the flue passes through the cavity, a low-speed vortex is formed in the cavity, so that the small solid particles carried by the vortex are easily accumulated in the cavity and cover the inner wall of the cavity, thereby reducing the heat transfer efficiency between the high-temperature flue gas and the inner wall of the cavity. After long-term use, the heat transfer efficiency of the spiral fin will be lower than that of the ordinary spiral fin. Therefore, the present invention provides an integral spiral fin tube for thermal power generation, which is used to clean the dust accumulation in the cavity. The specific implementation method is as follows:

[0041] When the device is in use, multiple groups of outer tubes 2 are first fixed in the smoke exhaust duct by means of the fixing plate 1, and the spiral fins 3 integrally formed on the outer wall of the outer tube 2 are used to recover heat from the high-temperature flue gas flowing through the outer tube 2 and the spiral fins 3, and the heat is taken away and utilized by the circulating water circulating in the inner tube 5. At this time, the concave holes 4 opened on the outer walls of the spiral fins 3 can increase the heat exchange area between the spiral fins 3 and the high-temperature flue gas, thereby improving the heat exchange rate, and the sliding block 8 is in state one at this time. When ash is accumulated in the concave hole 4 under the action of the flue gas, the ash layer formed between the inner wall of the concave hole 4 and the high-temperature flue gas hinders the heat exchange rate between the two. At this time, the driving component drives the sliding block 8 to switch to state two, so that the sliding block 8 scrapes off the ash on the side wall of the concave hole 4 when extending, and pushes it out of the concave hole 4. Under the influence of the high-speed airflow, the ash on the end of the sliding block 8 and the side wall of the concave hole 4 is blown away together, completing the cleaning of the concave hole 4, and then the sliding block 8 is switched to state one again to continue to increase the heat exchange area of ​​the spiral fin 3.

[0042] In this way, the sliding block 8 is switched back and forth between the two states through the driving component, so that the sliding block 8 can increase the surface area of ​​the spiral fin 3 when retracting the recessed hole 4, thereby improving the heat exchange efficiency, and when ash is accumulated in the recessed hole 4, the ash accumulated in the recessed hole 4 can be cleaned by extending the sliding block 8 to prevent the ash layer from reducing the heat exchange rate between the high-temperature flue gas and the inner wall of the recessed hole 4, and after cleaning, the sliding block 8 is retracted to continue to increase the surface area of ​​the spiral fin 3.

[0043] Further, the driving assembly includes a spiral pipe opened in the spiral fin 3, an expansion pipe 9 is arranged in the spiral pipe, the outer wall of the expansion pipe 9 is fixedly connected to the outer wall of the sliding block 8, a piston box 10 is fixedly installed on the side wall of the fixed plate 1, the part of the expansion pipe 9 passing through the spiral fin 3 is connected to the piston box 10 through the fixed pipe 11, and the expansion pipe 9 and the piston box 10 are filled with a heat-conducting medium, a piston plate 18 is slidably installed in the piston box 10, and a connecting rod 14 is fixed on the side wall of the piston plate 18;

[0044] It also includes a driving mechanism for driving the connecting rod 14 to move back and forth.

[0045] In the above further embodiment, a driving method for driving the sliding block 8 to extend or retract is provided. When dust is accumulated in the concave hole 4, the driving mechanism drives the connecting rod 14 to move, driving the piston plate 18 to slide in the piston box 10, pressing the heat transfer medium in the piston box 10 into the expansion tube 9, so that the expansion tube 9 expands in the spiral pipe until the end of the sliding block 8 is pushed out of the concave hole 4, completing the cleaning of the dust accumulated in the concave hole 4. Figure 3 As described above, since the diameter of the connecting end of the sliding block 8 and the expansion tube 9 is larger than the diameter of the recessed hole 4, and a groove is provided on the inner wall of the spiral pipe, the connecting end of the sliding block 8 and the expansion tube 9 can be in the same plane as the inner wall of the spiral pipe, so that the expansion tube 9 can fill the spiral pipe after expansion, avoiding leaving gaps so that the air in the gaps reduces the heat transfer efficiency of the spiral fins 3.

[0046] When the accumulated dust in the recessed hole 4 is blown away by the high-temperature airflow, the connecting rod 14 is driven to move in the opposite direction, pulling the piston plate 18 to slide in the opposite direction, so that the air pressure in the piston box 10 is increased, thereby extracting the heat transfer medium, and causing the expansion tube 9 to drive the sliding block 8 to shrink into the recessed hole 4 during the retraction process, and the recessed hole 4 is used to continue to increase the surface area of ​​the spiral fin 3, thereby increasing the heat exchange area.

[0047] In this way, the expansion and contraction of the expansion tube 9 can be completed by driving the connecting rod 14 to move back and forth through the driving mechanism, thereby driving the sliding block 8 to extend or retract, and cleaning the dust accumulated in the recessed hole 4. The connecting end of the sliding block 8 and the expansion tube 9 can be in the same plane with the inner wall of the spiral pipe through the card slot, which is conducive to filling the spiral pipe of the expansion tube 9 after expansion, and avoiding the presence of heat-conducting medium with low heat-conducting efficiency in the spiral pipe, thereby reducing the heat-conducting efficiency.

[0048] It is worth mentioning that recessed holes 4 can be opened on the curved surfaces on both sides of the expansion pipe, and the sliding blocks 8 on both sides can be driven to extend or retract the recessed holes 4 at the same time through the expansion pipe 9, so as to further increase the surface area of ​​the spiral fins 3, further increase the heat exchange area, and improve the heat exchange efficiency.

[0049] Furthermore, the driving mechanism includes two groups of fixed frames 12 fixed on the side walls of the fixed plate 1, an electromagnet 17 is provided in the fixed frame 12, a fixed shaft 16 is fixedly installed between the two groups of fixed frames 12, a slider 13 is slidably installed on the outer wall of the fixed shaft 16, and magnets are provided on both sides of the slider 13, and the end of the connecting rod 14 is fixed on the slider 13.

[0050] According to the above embodiment, it can be known that by making the electromagnets 17 in the two fixed frames 12 and the magnets on both sides of the slider 13 repel each other with the same poles, the repulsive force can be used to drive the slider 13 to slide and adjust on the outer wall of the fixed shaft 16 by energizing one of the electromagnets 17, thereby providing feasibility for driving the connecting rod 14 to move back and forth as mentioned above.

[0051] Embodiment 1 provides a specific implementation method for controlling the electromagnet 17 to be powered on and started;

[0052] A metal sheet 20 is provided on the top surface of the sliding block 8 , and metal wires 19 are fixedly connected to both sides of the metal sheet 20 . The metal wires 19 are connected to an external circuit and a current detection device, and the current detection device is electrically connected to the electromagnet 17 .

[0053] When the top surface of the sliding block 8 in the recessed hole 4 is covered with a layer of dust, the resistance of the metal sheet 20 will increase. At this time, the current flowing in the metal wire 19 buried in the spiral fin 3 will decrease, and the current will be detected in conjunction with the current detection equipment until the current decreases to exceed the preset range. The electromagnet 17 will be energized through the electrical connection. After the electromagnet 17 is energized, it drives the connecting rod 14 and the piston plate 18 to move together, pressing the heat-conducting medium in the piston box 10 to enter the expansion tube 9, driving the sliding blocks 8 on both sides of the expansion tube 9 to extend from the recessed hole 4, and cleaning the dust accumulated in the recessed hole 4. When the dust layer on the surface of the metal sheet 20 is blown away by the high-temperature airflow, the resistance of the metal sheet 20 decreases and returns to the preset range. At this time, another electromagnet 17 is energized and started, driving the slider 13 and the connecting rod 14 and the piston plate 18 to move in the opposite direction and reset, sucking the heat-conducting medium into the piston box 10, causing the expansion tube 9 to shrink and driving the sliding blocks 8 on both sides to retract into the recessed hole 4, and continuing to keep the outer surface of the spiral fin 3 enlarged.

[0054] In this way, by detecting the current flowing through the metal sheet 20, it is possible to determine in real time whether there is dust accumulation in the recessed hole 4, thereby being able to immediately control the extension of the sliding block 8 by controlling the power-on state of the electromagnet 17, so that the smoke and dust particles in the recessed hole 4 can be cleaned in time to avoid the formation of a stubborn hardened layer after long-term attachment.

[0055] Embodiment 2 provides a second specific implementation method for controlling the electromagnet 17 to be powered on. Fig. 9 ;

[0056] The electromagnet 17 is electrically connected to the external control unit 21 .

[0057] When the ash layer in the concave hole 4 accumulates too much, the electromagnet 17 can be started by external manual control of the control unit 21, so as to achieve the effect of controlling whether the sliding block 8 on the same spiral fin 3 extends or not.

[0058] Furthermore, the two groups of inner tubes 5 passing through the fixed plate 1 are fixedly connected with a connecting tube 6, one section of the connecting tube 6 is set as a fixed sleeve 7, a rotating core 24 is rotatably installed in the fixed sleeve 7, and a through hole is opened in the rotating core 24 to enable the connecting tube 6 to communicate;

[0059] It also includes a rotating assembly, which is used to drive the rotating core 24 to reciprocate in the fixed sleeve 7.

[0060] According to the above embodiment, it can be known that after the circulating water flows out from the upper group of inner tubes 5, it will flow into the next group of inner tubes 5 through the connecting tube 6. At this time, the rotating assembly quickly rotates the rotating core 24 to quickly reduce the aperture in the fixed sleeve 7, so that the circulating water in the connecting tube 6 stops suddenly, resulting in a water hammer effect. The water flow impacts the inner wall of the upper group of inner tubes 5, and while shaking off the water stains on the inner wall of the inner tube 5, the spiral fins 3 integrally formed on the outer wall of the inner tube 5 are also vibrated, shaking off the small solid particles on the outer wall of the spiral fins 3 and the outer wall of the outer tube 2, cleaning the spiral fins 3 and the outer wall of the outer tube 2, avoiding the accumulation of ash layers on the outer wall of the spiral fins 3 and the outer wall of the outer tube 2, which reduces the heat exchange efficiency between the high-temperature airflow and the spiral fins 3, and then restores the aperture in the fixed sleeve 7 to restore the flow rate of the circulating water.

[0061] In this way, by quickly reducing the aperture in the fixed sleeve 7, the suddenly stopped water flow can impact the inner wall of the upper group of inner tubes 5, shake off the water stains on the inner wall of the inner tube 5, and avoid the water stains reducing the heat transfer efficiency between the circulating water flow in the inner tube 5. The vibration generated by the water hammer effect can shake off the small solid particles on the spiral fins 3 and the outer wall of the outer tube 2, clean the spiral fins 3 and the outer wall of the outer tube 2, and further improve the heat conduction efficiency between the high-temperature flue gas and the circulating water.

[0062] It is worth mentioning that when the rotating core 24 rotates rapidly, the sliding block 8 extends out of the recessed hole 4, scrapes off the ash layer on the inner wall of the recessed hole 4 and pushes it to the outside of the recessed hole 4. When the high-temperature airflow blows away the ash layer on the inner wall of the recessed hole 4 and the ash layer on the top layer of the sliding block 8, the water hammer effect triggered by the rapid change of the inner diameter of the fixed sleeve 7 causes the sliding block 8 to vibrate together, further improving the ash cleaning effect on the end face of the sliding block 8.

[0063] When the control unit 21 is manually controlled externally, the electromagnets 17 can be controlled to start in sequence, so that the rotating cores 24 rotate in sequence without affecting each other, so that each group of inner tubes 5 can vibrate in sequence by utilizing the water hammer effect, so as to achieve the effect of cleaning each spiral fin 3. Compared with the first embodiment in which the electromagnet 17 is controlled to start in real time by current detection, the rotating cores 24 in two or more connecting tubes 6 can be prevented from rotating at the same time, so that the water hammer effect generated in the inner tubes 5 in the rear row is weakened, thereby ensuring the cleaning effect between each spiral fin 3.

[0064] Furthermore, the rotating assembly includes a rotating shaft 23 fixed on the side wall of the rotating core 24, a rotating plate 22 is fixedly installed on the outer wall of the rotating shaft 23, one end of the rotating plate 22 away from the rotating shaft 23 is fixedly connected to a tension spring 15, one end of the tension spring 15 is fixedly connected to the outer wall of the slider 13, and the connection point between the tension spring 15 and the rotating plate 22 is located below the rotating core 24.

[0065] According to the above embodiment, when the electromagnet 17 drives the slider 13 to slide on the outer wall of the fixed shaft 16, the Figure 6 , at this time, the slider 13 moves toward the piston box 10. When the slider 13 moves to the dotted line position, the tension of the tension spring 15 and the stress between the rotating plate 22 are in the same straight line, and the tension of the tension spring 15 is at the maximum value. When the slider 13 continues to move, the tension of the tension spring 15 on the end of the rotating plate 22 is inclined, generating a horizontal component of force, so that the tension spring 15 pulls the rotating plate 22 to rotate counterclockwise. Due to the rapid contraction of the tension spring 15, the rotating plate 22 is driven to rotate rapidly, and at the same time, the rotating core 24 is driven to rotate rapidly through the rotating shaft 23, so as to achieve the purpose of quickly changing the inner diameter of the fixed sleeve 7 as mentioned above. Since the rotation of the rotating core 24 is limited by a rotation limiter (such as a slider or a pin shaft, etc.) in the fixed sleeve, the rotating plate 22 can only rotate within a certain range below the rotating core 24, so as to avoid excessive rotation causing the end of the rotating plate 22 to move upward due to the tension of the tension spring 15, and the rotating core 24 cannot be accelerated.

[0066] It is worth mentioning that, from the above content, it can be seen that the movement of the slider 13 will drive the piston plate 18 to move in the piston box 10, squeezing the heat-conducting medium into the expansion tube 9, so as to achieve the purpose of extending the sliding block 8. Due to the delay effect produced by the tension spring 15, the sliding block 8 will be extended earlier than the rotation of the rotating core 24. In this way, the vibration generated by the water hammer effect in the inner tube 5 can be used to improve the cleaning effect of the ash layer in the recessed hole 4, thereby improving the heat exchange rate between the spiral fin 3 and the high-temperature air.

[0067] Furthermore, the end surface of the sliding block 8 is configured as a windward inclined surface.

[0068] According to the above embodiment, it can be seen that by setting the end surface of the sliding block 8 as a windward inclined surface, see Figure 8 When the end face of the sliding block 8 extends out from the recessed hole 4, the accumulated ash in the recessed hole 4 is pushed out of the recessed hole 4. At this time, the high-temperature flue gas flows through the inclined surface, making it easier to blow away the accumulated ash on the inclined surface. Combined with the vibration effect caused by the water hammer effect, the ash removal effect on the inclined surface is improved.

[0069] Furthermore, the cross section of the expansion tube 9 is rectangular, and the narrow sides on both sides are made of hard materials, while the long sides are made of soft materials.

[0070] According to the above embodiment, the cross-section of the expansion tube 9 is set to be a rectangle, so that the expansion tube 9 can be completely fitted with the spiral pipe after expansion, and the hard material on the narrow sides on both sides can make the expansion tube 9 quickly take shape after expansion, fit with the inner wall of the spiral pipe, and transfer the heat in the spiral fin 3 through the heat-conducting medium in the expansion tube 9, avoiding the heat from being transferred through the air between the expansion tube 9 and the spiral pipe, thereby reducing the heat transfer rate of the spiral fin 3 to the high-temperature flue gas.

[0071] Furthermore, the outer wall of the spiral fin 3 is configured as a curved surface which is thick at both ends and thin in the middle.

[0072] According to the above embodiment, a specific embodiment of the spiral fin 3 is provided, such as Fig.10 As shown, the outer wall of the spiral fin 3 is set to be a curved surface that is thick at both ends and thin in the middle, so that the heat exchange area of ​​the spiral fin 3 is increased compared with the ordinary spiral curved surface, thereby improving the heat exchange rate of the spiral fin 3 to the high-temperature flue gas, thereby improving the working efficiency of the economizer.

[0073] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integral spiral fin tube for thermal power generation, comprising an outer tube (2) that can be installed between economizer fixing plates (1), characterized in that: The inner wall of the outer tube (2) is integrally formed with an inner tube (5), the outer wall of the outer tube (2) is integrally formed with a spiral fin (3), and the outer wall of the spiral fin (3) is provided with a plurality of groups of concave holes (4); It also includes a sliding block (8) installed in the concave hole (4), and the sliding block (8) has two states: in state one, the sliding block (8) extends out of the concave hole (4), and the end surface of the sliding block (8) is higher than the curved surface of the spiral fin (3); in state two, the sliding block (8) is retracted into the concave hole (4), and the end surface of the sliding block (8) is lower than the curved surface of the spiral fin (3); It also comprises a driving component, which is used to drive the sliding block (8) to switch back and forth between state one and state two.

2. The integral spiral fin tube for thermal power generation according to claim 1, characterized in that: The driving assembly comprises a spiral pipe opened in the spiral fin (3), an expansion pipe (9) is arranged in the spiral pipe, the outer wall of the expansion pipe (9) is fixedly connected to the outer wall of the sliding block (8), a piston box (10) is fixedly installed on the side wall of the fixed plate (1), the part of the expansion pipe (9) passing through the spiral fin (3) is connected to the piston box (10) through the fixed pipe (11), and the expansion pipe (9) and the piston box (10) are filled with heat-conducting medium, a piston plate (18) is slidably installed in the piston box (10), and a connecting rod (14) is fixed on the side wall of the piston plate (18); It also comprises a driving mechanism, which is used for driving the connecting rod (14) to move back and forth.

3. The integral spiral fin tube for thermal power generation according to claim 2, characterized in that: The driving mechanism comprises two groups of fixing frames (12) fixed on the side wall of the fixing plate (1), an electromagnet (17) is arranged inside the fixing frames (12), a fixing shaft (16) is fixedly installed between the two groups of fixing frames (12), a slider (13) is slidably installed on the outer wall of the fixing shaft (16), and magnets are arranged on both sides of the slider (13), and the end of the connecting rod (14) is fixed on the slider (13).

4. The integral spiral fin tube for thermal power generation according to claim 3, characterized in that: A metal sheet (20) is provided on the top surface of the sliding block (8), and metal wires (19) are fixedly connected to both sides of the metal sheet (20). The metal wires (19) are connected to an external circuit and a current detection device, and the current detection device is electrically connected to the electromagnet (17).

5. The integral spiral fin tube for thermal power generation according to claim 3, characterized in that: The electromagnet (17) is electrically connected to the external control unit (21).

6. The integral spiral fin tube for thermal power generation according to claim 3, characterized in that: The portions of the two groups of inner tubes (5) passing through the fixed plate (1) are fixedly connected to a connecting tube (6), one section of the connecting tube (6) is set as a fixed sleeve (7), a rotating core (24) is rotatably installed in the fixed sleeve (7), and a through hole is opened in the rotating core (24) to enable the connecting tube (6) to communicate; It also comprises a rotating assembly, which is used to drive the rotating core (24) to reciprocate in the fixed sleeve (7).

7. The integral spiral fin tube for thermal power generation according to claim 6, characterized in that: The rotating assembly comprises a rotating shaft (23) fixed to the side wall of a rotating core (24); a rotating plate (22) is fixedly mounted on the outer wall of the rotating shaft (23); one end of the rotating plate (22) away from the rotating shaft (23) is fixedly connected to a tension spring (15); one end of the tension spring (15) is fixedly connected to the outer wall of the slider (13); and the connection point between the tension spring (15) and the rotating plate (22) is located below the rotating core (24).

8. The integral spiral fin tube for thermal power generation according to any one of claims 1 to 7, characterized in that: The end surface of the sliding block (8) is configured as a windward inclined surface.

9. The integral spiral fin tube for thermal power generation according to claim 2, characterized in that: The expansion tube (9) has a rectangular cross section, and the narrow side portions on both sides are made of hard materials, while the long side portions are made of soft materials.

10. The integral spiral fin tube for thermal power generation according to any one of claims 1 to 7, characterized in that: The outer wall of the spiral fin (3) is designed to be a curved surface that is thick at both ends and thin in the middle.

Images