A device and method for recovering and reusing waste heat from flue gas in thermal power plants

Abstract

The present invention relates to the technical field of waste heat recovery and reuse of boiler flue gas, and discloses a waste heat recovery and reuse device and method for boiler flue gas in a thermal power plant, comprising two parallel side plates, a fixing rod slidably penetrated between the two side plates, the two ends of the fixing rod are set as nail heads and screws, and nuts are threadedly connected at the screws, the nail heads and screws are cross-distributed on both sides of the side plates, and multiple heat conducting plates are clamped between the two side plates, and sealing rings are provided between the heat conducting plates. The present invention compresses the elastic member until the nuts are fully utilized to rigidly clamp the heat conducting plates between the two side plates, and when the nuts are loosened, the elastic member continues to provide a clamping force to the two side plates to approach each other, so that the clamping of the remaining heat conducting plates can be maintained during the replacement of the heat conducting plates, and the heat conducting plates and the sealing rings can be prevented from being separated and then compressed, so that the sealing rings are torn, over-compressed or misplaced during reassembly or disassembly, affecting the sealing performance of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler flue gas waste heat recovery and reuse, and in particular to a waste heat recovery and reuse device and method for boiler flue gas in a thermal power plant. Background Art

[0002] The waste heat recovery and reuse devices of boiler flue gas in thermal power plants include economizers, tubular heat exchangers, plate heat exchangers, heat storage heat exchangers and other types of heat exchangers. Among them, the plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. The plate heat exchanger is an ideal equipment for liquid-liquid and liquid-gas heat exchange. It has the characteristics of high heat exchange efficiency, low heat loss, compact and light structure, small footprint, wide application and long service life. Under the same pressure loss, its heat transfer coefficient is 3 to 5 times higher than that of the tubular heat exchanger, and the footprint is one-third of that of the tubular heat exchanger. The heat recovery rate can be as high as 90% or more.

[0003] However, existing plate heat exchangers usually use sealing gaskets to prevent leakage between fluids. These gaskets may degrade due to temperature, pressure or chemical corrosion, resulting in poor sealing performance, and therefore require more frequent maintenance and cleaning, especially when dealing with scaling or viscous media. When replacing plates or sealing target gaskets in plate heat exchangers, it is usually necessary to separate the plate group, so that the sealing gaskets between the remaining plates may be misplaced. These misplaced sealing gaskets will be squeezed when the plate heat exchanger is reassembled, and may cover the wrong sealing surface or be partially squeezed out, causing damage to the sealing gasket and resulting in poor sealing. Summary of the invention

[0004] The object of the present invention is to provide a device and method for recovering and reusing waste heat from flue gas in a thermal power plant boiler, so as to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waste heat recovery and reuse device for flue gas from a boiler in a thermal power plant, comprising two parallel side plates, a fixing rod is slidably inserted between the two side plates, nail heads and screws are provided at both ends of the fixing rod, and nuts are threadedly connected at the screws, the nail heads and screws are cross-distributed on both sides of the side plates, a plurality of heat conducting plates are clamped between the two side plates, sealing rings are provided between the heat conducting plates, and flues and water channels are provided on the heat conducting plates and side walls of the side plates;

[0006] Also included is an opening and closing assembly, which is used to move two adjacent heat conducting plates away from or closer to each other;

[0007] It also includes an elastic member, which is used to apply an elastic clamping force toward the middle of the two side plates when two adjacent heat conducting plates move away from each other.

[0008] Preferably, the opening and closing assembly comprises two fixing bars, one end of each of the fixing bars is fixed to one of the side panels, and the other end is slidably inserted into a hole provided in the side panel of the other side panel, a plurality of sliding shaft seats are slidably installed on the side panels of the fixing bars, two bait blocks are fixedly installed on the top surface of the heat conducting plate, and a rotating rod is rotatably installed between each of the bait blocks and the two sliding shaft seats opposite thereto;

[0009] The invention also comprises a driving part, wherein the driving part is used to change the angle between two adjacent rotating rods.

[0010] Preferably, the driving part comprises a fixed shaft installed between the two side plates, and one end of the fixed shaft is fixed to the side wall of one of the side plates, and the other end is slidably inserted into a hole opened in the side wall of the other side plate, a plurality of sleeves corresponding to the heat conducting plates are installed on the outer wall of the fixed shaft, and the sleeves can slide and rotate on the fixed shaft, a driven gear is fixedly installed on the outer wall of the sleeve, two locking blocks are coaxially installed on both sides of the driven gear, an arc groove is opened on the side of the heat conducting plate for the locking blocks to rotate into, and two cams are coaxially installed on the sides of the two locking blocks;

[0011] The driving part also includes a moving frame, the moving frame is sleeved on the outer rings of the two locking blocks, and the fixed shaft passes through the empty slots on both sides of the moving frame, the two cams are respectively located in the empty slots on both sides of the moving frame, and are in contact with the inner walls of the empty slots, and a vertical rod for vertically sliding and limiting the moving frame is installed on the top of the heat conducting plate;

[0012] It also includes a connecting part, which is used to fix the rotating point between the two rotating rods and the moving frame.

[0013] Preferably, the connecting part includes two connecting rods fixedly connected to both sides of the moving frame, sliding blocks are vertically slidably installed on the internal slide rails of the bait blocks on both sides, and the downward ends of the two adjacent rotating rods are rotatably connected to the sliding blocks together, and one end of the two connecting rods is fixedly connected to the two sliding blocks respectively.

[0014] Preferably, the connecting part includes a connecting rod fixedly connected to both sides of the movable frame, a sliding groove is provided at the top of the connecting rod, a latch is slidably installed in the sliding groove, a slider is vertically slidably installed in the sliding shaft seat, the upward ends of two adjacent rotating rods are rotatably connected to the slider together, and the side wall of the slider is provided with a through hole for the latch to be inserted.

[0015] Preferably, a rotating shaft is installed between the two side panels, and one end of the rotating shaft is rotatably installed on the side wall of one of the side panels, and the other end is inserted into a hole opened in the side wall of the other side panel. A motor for driving the rotating shaft to rotate is fixedly installed on the side wall of the side panel, and two sliding gears that can slide and adjust on the outer wall of the rotating shaft are fixedly installed on the outer wall of the rotating shaft, and the sliding gears can mesh with the driven gear.

[0016] Preferably, the elastic member comprises a baffle fixedly mounted on the outer wall of the fixing rod, and a spring is provided between the side plate and the nail head at the end of the fixing rod.

[0017] Preferably, a limiting tube is fixedly installed in the slide groove, the latch is slidably installed in the limiting tube, and a threaded handle is fixedly installed on the outer wall of the latch.

[0018] Preferably, the locking block is composed of two semicircular plates with different diameters, and the distance between the axis of the fixed shaft and the top surface of the heat conducting plate is greater than the distance between the arc surface of the semicircular plate with a smaller radius and the axis of the fixed shaft.

[0019] A method for recovering and reusing waste heat from flue gas in a thermal power plant boiler comprises the following steps:

[0020] Step 1: First, tighten the nut to clamp the baffle and nut together, so that the side plate and the flue and water channels of the heat conduction plate are aggregated, and sealed with a sealing ring, so that the high-temperature flue gas and circulating water transfer heat through the heat conduction plate;

[0021] Step 2: When leakage occurs between the heat conducting plates, tighten the nuts to loosen the two side plates, and continue to apply clamping force to the side plates through the springs on both sides.

[0022] Step 3: Then, the heat conducting plates on both sides of the leaking heat conducting plate are moved away from each other through the opening and closing components. At the same time, the heat conducting plates moving away from each other will cooperate with the springs on both sides to apply pressure to the heat conducting plates arranged between the heat conducting plate and the side plates, and keep them in close contact during the movement;

[0023] Step 4: After that, replace the heat conducting plate and tighten the nut, continue to clamp the baffle and the nut together, and complete the reassembly of the device;

[0024] Step 5: Repeat steps 1 to 4 above when you need to replace the heat conducting plate again.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention compresses the elastic member until the nut is fully utilized to rigidly clamp the heat conducting plate between the two side plates, and when the nut is loosened, the elastic member continues to provide a clamping force to bring the two side plates closer to each other, and cooperates with the opening and closing assembly to drive the two heat conducting plates away from each other, leaving space for replacing the leaking heat conducting plate, so that the remaining heat conducting plates can be clamped during the replacement of the heat conducting plates, and the heat conducting plates and the sealing rings can be prevented from being separated and then compressed, so that the sealing rings are torn, over-compressed or misplaced during reassembly or disassembly, thereby affecting the sealing performance of the heat exchanger.

[0027] 2. The present invention drives the locking block to unlock the heat conducting plate by rotating the sleeve, and cooperates with the cam to drive the moving frame to slide up and down, so that the rotating rod rotates to push the two adjacent heat conducting plates away from each other, providing sufficient space for the replacement and removal of the heat conducting plates, while disconnecting the limit of the heat conducting plates, so as to facilitate the rapid removal and replacement of the heat conducting plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the heat conducting plate according to the first embodiment of the present invention;

[0030] Figure 3 It is a partial cross-sectional view of the heat conducting plate of the first embodiment of the present invention;

[0031] Figure 4 It is a partial cross-sectional stereoscopic view of a heat conducting plate according to the first embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a rotating rod and related structures according to Embodiment 1 of the present invention;

[0033] Figure 6 It is a schematic diagram of the rotating rod after rotating in the first embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the three-dimensional structure of a heat conducting plate according to the second embodiment of the present invention;

[0036] Fig. 9 It is a partial cross-sectional view of a heat conducting plate according to the second embodiment of the present invention;

[0037] Fig.10 It is a partial cross-sectional stereoscopic view of the heat conducting plate of Example 2 of the present invention;

[0038] Fig.11 It is a schematic diagram of a rotating rod and related structures according to a second embodiment of the present invention;

[0039] Fig.12 It is a schematic diagram of the rotating rod after rotating in the second embodiment of the present invention;

[0040] Fig.13 It is a cross-sectional view of the side panel of the present invention.

[0041] In the figure: 1. side panel; 2. rotating shaft; 3. fixed rod; 4. sliding gear; 5. motor; 6. flue; 7. water channel; 8. heat conduction plate; 9. sealing ring; 10. bait block; 11. locking block; 12. driven gear; 13. moving frame; 14. cam; 15. connecting rod; 16. rotating rod; 17. sliding shaft seat; 18. sliding block; 19. connecting rod; 20. sleeve; 21. fixing strip; 22. limiting tube; 23. latch; 24. threaded handle; 25. spring; 26. fixed shaft; 27. baffle; 28. vertical rod; 29. ​​slider. DETAILED DESCRIPTION

[0042] 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.

[0043] See also Figures 1 to 13 The present invention provides a technical solution: a waste heat recovery and reuse device for flue gas of a thermal power plant boiler, comprising two parallel side plates 1, a fixing rod 3 is slidably inserted between the two side plates 1, both ends of the fixing rod 3 are provided with nail heads and screws, and nuts are threadedly connected at the screws, the nail heads and the screws are cross-distributed on both sides of the side plates 1, a plurality of heat conducting plates 8 are clamped between the two side plates 1, sealing rings 9 are provided between the heat conducting plates 8, and flues 6 and water channels 7 are provided on the side walls of the heat conducting plates 8 and the side plates 1;

[0044] It also includes an opening and closing assembly, which is used to move two adjacent heat conducting plates 8 away from or closer to each other;

[0045] It also includes an elastic member, which is used to apply an elastic clamping force toward the middle of the two side plates 1 when two adjacent heat conducting plates 8 move away from each other.

[0046] When replacing the heat transfer plate or the sealing ring of a plate heat exchanger, the heat transfer plate and the sealing ring are loose and far away from each other, so the sealing ring may be torn, over-compressed or misplaced during reinstallation or disassembly, affecting the sealing performance. Therefore, the present device provides a waste heat recovery and reuse device for boiler flue gas in a thermal power plant, which is used to continue to provide clamping force to the remaining heat transfer plates when replacing a leaking heat transfer plate.

[0047] When the device is in use, firstly, the nut is screwed to clamp the side plate 1 and the heat conducting plate 8 together, the flue and water channels of the side plate 1 and the heat conducting plate 8 are aggregated, and sealed by the sealing ring 9, so that the high-temperature flue gas and circulating water transfer heat through the heat conducting plate 8; when leakage occurs between the heat conducting plates 8, the nut is screwed to loosen the two side plates 1, and the clamping force is continued to be applied to the side plates 1 through the elastic member, and then the heat conducting plates 8 on both sides of the leaking heat conducting plate 8 are moved away from each other through the opening and closing assembly, and at the same time, the elastic member applies pressure to move the side plates 1 on both sides away from each other while keeping the heat conducting plate 8 clamped, and then the heat conducting plate 8 is replaced and the nut is screwed, and the nut is continued to be used to clamp the side plate 1 and the heat conducting plate 8 together to complete the reinstallation of the device.

[0048] In this way, the elastic member is compressed until the nut is fully utilized to rigidly clamp the heat conducting plate 8 between the two side plates 1, and when the nut is loosened, the elastic member continues to provide a clamping force to the two side plates 1 to approach each other, so as to prevent the heat conducting plates 8 from directly spreading out, and then cooperate with the opening and closing component to drive the two heat conducting plates 8 away from each other, leaving space for replacing the leaking heat conducting plate 8, so that the target heat conducting plate 8 can still maintain the clamping of the remaining heat conducting plates 8 during the replacement process, so as to prevent the heat conducting plate 8 and the sealing ring 9 from being separated and then compressed, resulting in the sealing ring 9 being torn, over-compressed or misplaced during reassembly or disassembly, thereby affecting the sealing performance of the heat exchanger.

[0049] Furthermore, the opening and closing assembly includes two fixing strips 21, one end of the two fixing strips 21 is fixed to the side wall of one of the side plates 1, and the other end is slidably inserted into a hole opened in the side wall of the other side plate 1, and a plurality of sliding shaft seats 17 are slidably installed on the side wall of the fixing strip 21, and two bait blocks 10 are fixedly installed on the top surface of the heat conducting plate 8, and a rotating rod 16 is rotatably installed between each bait block 10 and the two sliding shaft seats 17 opposite to it;

[0050] The device also includes a driving unit, which is used to change the angle between two adjacent rotating rods 16 .

[0051] According to the above embodiment, when the driving unit drives two adjacent rotating rods 16 to rotate relative to each other at the same time, the two non-overlapping ends of the rotating rods 16 move away from each other, driving the two bait blocks 10 and the two sliding shaft seats 17 to slide toward the two side plates 1, so that the two heat conducting plates 8 move away from each other, providing operating space for replacing the heat conducting plates 8.

[0052] Further, the driving part includes a fixed shaft 26 installed between the two side plates 1, and one end of the fixed shaft 26 is fixed to the side wall of one of the side plates 1, and the other end is slidably inserted into a hole opened in the side wall of the other side plate 1, and a plurality of sleeves 20 corresponding to the heat conducting plates 8 are installed on the outer wall of the fixed shaft 26, and the sleeves 20 can slide and rotate on the fixed shaft 26, and a driven gear 12 is fixedly installed on the outer wall of the sleeve 20, and two locking blocks 11 are coaxially installed on both sides of the driven gear 12, and an arc groove for the locking blocks 11 to rotate into is opened on the side of the heat conducting plate 8, and two cams 14 are also coaxially installed on the sides of the two locking blocks 11;

[0053] The driving part also includes a moving frame 13, which is sleeved on the outer rings of the two locking blocks 11, and the fixed shaft 26 passes through the empty slots on both sides of the moving frame 13, and the two cams 14 are respectively located in the empty slots on both sides of the moving frame 13 and contact and abut against the inner walls of the empty slots. A vertical rod 28 for vertically sliding and limiting the moving frame 13 is installed on the top of the heat conducting plate 8;

[0054] It also includes a connecting portion, which is used to fix the rotating point between the two rotating rods 16 and the moving frame 13.

[0055] According to the above embodiment, when the external structure drives the sleeve 20 to rotate 180 degrees through the driven gear 12, the cam 14 will be driven to rotate 180 degrees together, and the moving frame 13 will be driven to move up and down under the action of the vertical rod 28. The moving frame 13 can cooperate with the connecting part to drive the rotating point between the two rotating rods 16 to move up and down together, so that the rotating rod 16 starts to rotate due to the movement of the rotating point, pushing the two adjacent heat conducting plates 8 away from each other, and the above-mentioned purpose of driving the two adjacent heat conducting plates 8 away from each other can be achieved.

[0056] At the same time, the sleeve 20 drives the locking block 11 to rotate 180 degrees, so that the locking block 11 rotates out of the arc groove provided on the side wall of the heat conducting plate 8, thereby completing the unlocking of the heat conducting plate 8.

[0057] In this way, the locking block 11 is driven to unlock the heat conducting plate 8 by rotating the sleeve 20, and the cam 14 is cooperated to drive the movable frame 13 to slide up and down, so that the rotating rod 16 is rotated to push the two adjacent heat conducting plates 8 away from each other, thereby providing sufficient space for the replacement and disassembly of the heat conducting plate 8, and disconnecting the limit of the heat conducting plate 8, so as to facilitate the rapid disassembly and replacement of the heat conducting plate 8.

[0058] It is worth noting that the heat conducting plate 8 is suspended between the two side plates 1 and is kept suspended only by the clamping force provided by the side plates 1. When the heat conducting plate 8 is installed and locked by the locking block 11, the fixed shaft 26 under the heat conducting plate 8 is used as a load-bearing shaft to provide support for the heat conducting plate 8, thereby preventing the heat conducting plates 8 from sliding relative to each other due to insufficient friction between the heat conducting plates 8, resulting in failure of the sealing.

[0059] Embodiment 1 provides a method for changing the angle between the two rotating rods 16:

[0060] Furthermore, the connecting part includes two connecting rods 15 fixedly connected to both sides of the moving frame 13, and sliding blocks 18 are vertically slidably installed on the internal slide rails of the bait blocks 10 on both sides, and the downward ends of the two adjacent rotating rods 16 are jointly rotatably connected to the sliding blocks 18, and one end of the two connecting rods 15 is fixedly connected to the two sliding blocks 18 respectively.

[0061] Specific reference Figures 2 to 6 When the moving frame 13 moves upward under the drive of the cam 14, the sliding block 18 and the rotating points of the two connecting rods 15 slide upward together in the bait block 10 through the connecting rod 15, so that the connecting rod 15 pushes the upper sliding shaft seat 17 to slide away from each other, and at the same time drives the heat conducting plates 8 on both sides of the bait block 10 away from each other, so that space is formed on both sides of the heat conducting plate 8 under the bait block 10, providing sufficient space for replacing the heat conducting plate 8, and when the moving frame 13 moves to the highest point, the sliding block 18 slides out of the bait block 10, completely releasing the limit on the heat conducting plate 8, which is convenient for disassembly and replacement of the heat conducting plate 8.

[0062] In this way, when it is detected that the sealing of the heat exchanger is destroyed due to damage to the heat conducting plate 8, the sliding block 18 can be driven upward by the movable frame 13 to drive the heat conducting plates 8 on both sides of the heat conducting plate 8 to be replaced to move away from each other, thereby freeing up space on both sides of the heat conducting plate 8 to facilitate the disassembly and replacement of the heat conducting plate 8.

[0063] Embodiment 2 is basically the same as Embodiment 1, except that a second method for changing the angle between the two rotating rods 16 is provided:

[0064] Furthermore, the connecting part includes a connecting rod 19 fixedly connected to both sides of the moving frame 13, a sliding groove is provided at the top of the connecting rod 19, a pin 23 is slidably installed in the sliding groove, a slider 29 is vertically slidably installed in the sliding shaft seat 17, and the upward ends of the two adjacent rotating rods 16 are rotatably connected to the slider 29 together, and the side wall of the slider 29 is provided with a through hole for the pin 23 to be inserted.

[0065] Specific reference Figures 8 to 12 When it is detected that the seal of the heat exchanger fails due to damage of the sealing ring 9, the pins 23 above the heat conducting plates 8 on both sides of the sealing ring 9 can be driven by external force (such as manual force) to insert into the slider 29 in the middle above the two heat conducting plates 8, and then the moving frame 13 is driven to move downward, driving the slider 29 to slide downward, so that the rotating rod 16 rotates with the sliding shaft seat 17 as the fulcrum, pushing the two heat conducting plates 8 away from each other, and forming a space between the two heat conducting plates 8.

[0066] In this way, since the rotating rod 16 has not separated from the sliding shaft seat 17, the heat conducting plate 8 is completely free of limit. The sealing ring 9 can be replaced while maintaining a certain limit on the heat conducting plate 8. In the event of damage to the sealing ring 9, there is no need to disassemble and install the heat conducting plate 8, and the replacement of the sealing ring 9 can be completed, thereby improving the replacement efficiency of the sealing ring 9.

[0067] Furthermore, a rotating shaft 2 is installed between the two side panels 1, and one end of the rotating shaft 2 is rotatably installed on the side wall of one of the side panels 1, and the other end is inserted into a hole opened in the side wall of the other side panel 1. A motor 5 for driving the rotating shaft 2 to rotate is fixedly installed on the side wall of the side panel 1, and two sliding gears 4 that can slide and adjust on the outer wall of the rotating shaft 2 are fixedly installed on the outer wall of the rotating shaft 2, and the sliding gear 4 can mesh with the driven gear 12.

[0068] According to the above embodiment, when the heat conducting plate 8 needs to be replaced, the sliding gear 4 is driven by external force to slide to the top of the heat conducting plate 8 that needs to be replaced and mesh with the driven gear 12 above it, and then the motor 5 is started to drive the sliding gear 4 to drive the driven gear 12 to rotate 180 degrees, so that the locking block 11 rotates out of the arc groove opened on the heat conducting plate 8, thereby unlocking the heat conducting plate 8, and at the same time drives the sleeve 20 to rotate 180 degrees, drives the cam 14 to rotate and drives the moving frame 13 to slide up and down, so as to achieve the purpose of driving the rotating rod 16 to rotate.

[0069] In this way, the heat conducting plate 8 to be replaced is selected through the sliding gear 4 to be unlocked and replaced, and the damaged heat conducting plate 8 can be replaced alone, thereby avoiding unnecessary disassembly process and improving the replacement rate.

[0070] It is worth noting that in the above different embodiments, the number of sliding gears 4 required is also different. In embodiment 1, one sliding gear 4 is required, and in embodiment 2, two sliding gears need to be engaged at the same time, and the thickness of the sliding gear in embodiment 2 needs to be increased to meet a certain relative sliding.

[0071] Furthermore, the elastic member includes a baffle 27 fixedly mounted on the outer wall of the fixing rod 3 , and a spring 25 is provided between the side plate 1 and the nail head at the end of the fixing rod 3 .

[0072] According to the above embodiment, it can be known that when the nut is turned, the two side plates 1 are moved closer to each other, compressing the spring 25 until the baffle 27 and the nut jointly rigidly clamp the two side plates 1 and the heat conducting plate 8, thereby preventing the heat exchanger from loosening during use and causing sealing failure. When the heat conducting plate 8 needs to be replaced, the nut is turned in the opposite direction so that the springs 25 on both sides elastically clamp the heat conducting plate 8, so that the clamping force on the heat conducting plate 8 can be maintained when the two adjacent heat conducting plates 8 are away from each other, thereby preventing the heat conducting plate 8 from being separated from the sealing ring 9.

[0073] Furthermore, a limit tube 22 is fixedly installed in the slide groove, a latch 23 is slidably installed in the limit tube 22 , and a threaded handle 24 is fixedly installed on the outer wall of the latch 23 .

[0074] According to the above embodiment, the stop tube 22 can reduce the friction force when the latch 23 slides, and cooperate with the threaded handle 24 to reduce the force requirement when the latch 23 slides, so as to avoid the failure of the latch 23 to slide due to the poor position of the manual force caused by the device. Figure 7 When the latch 23 is inserted into the slider 29 on one side until the threaded handle 24 is free from the rotation restriction of the connecting rod 19, the latch 23 can be limited by rotating the threaded handle 24 to prevent the latch 23 from falling out of the slider 29 due to factors such as vibration.

[0075] Furthermore, the locking block 11 is composed of two semicircular plates with different diameters, and the distance between the axis of the fixed shaft 26 and the top surface of the heat conducting plate 8 is greater than the distance between the arc surface of the semicircular plate with a smaller radius and the axis of the fixed shaft 26 .

[0076] According to the above embodiment, since the locking block 11 is composed of two semicircular plates with different diameters, see Figure 2 and Figure 3 When the semicircular plate with a smaller radius rotates downward, there is a gap between the bottom end of the locking block 11 and the top surface of the heat conducting plate 8, so that the heat conducting plate 8 has more space to move during the removal and installation process, avoiding the phenomenon of getting stuck and making it impossible to remove the heat conducting plate 8 smoothly.

[0077] A method for recovering and reusing waste heat from flue gas in a thermal power plant boiler comprises the following steps:

[0078] Step 1: First, tighten the nut to clamp the baffle 27 and the nut together, so that the flue and water channels of the side plate 1 and the heat conducting plate 8 are aggregated, and sealed by the sealing ring 9, so that the high-temperature flue gas and circulating water transfer heat through the heat conducting plate 8;

[0079] Step 2: When leakage occurs between the heat conducting plates 8 , the nuts are turned to loosen the two side plates 1 , and the springs 25 on both sides continue to apply clamping force to the side plates 1 .

[0080] Step 3: Then, the heat conducting plates 8 on both sides of the leaking heat conducting plate 8 are moved away from each other through the opening and closing assembly. At the same time, the heat conducting plates 8 moving away from each other will cooperate with the springs 25 on both sides to apply pressure to the heat conducting plates 8 arranged between the heat conducting plates 8 and the side plates 1, and keep them in a close contact state during the movement;

[0081] Step 4: After that, replace the heat conducting plate 8 and tighten the nut, continue to use the baffle 27 and the nut to clamp each other, and complete the reassembly of the device;

[0082] Step 5: When the heat conducting plate 8 needs to be replaced again, repeat the above steps 1 to 4.

[0083] 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.

[0084] 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. A waste heat recovery and reuse device for flue gas from a thermal power plant boiler, comprising two parallel side plates (1), characterized in that: A fixing rod (3) is slidably provided between the two side plates (1), the two ends of the fixing rod (3) are provided with a nail head and a screw rod, and a nut is threadedly connected to the screw rod, the nail head and the screw rod are cross-distributed on both sides of the side plate (1), a plurality of heat conducting plates (8) are clamped between the two side plates (1), a sealing ring (9) is provided between the heat conducting plates (8), and a flue (6) and a water channel (7) are provided on the side walls of the heat conducting plates (8) and the side plates (1); It also includes an opening and closing assembly, which is used to move two adjacent heat conducting plates (8) away from or closer to each other; It also includes an elastic member, which is used to apply an elastic clamping force toward the middle of the two side plates (1) when two adjacent heat conducting plates (8) move away from each other; The opening and closing assembly comprises two fixing strips (21), one end of the two fixing strips (21) is fixed to the side wall of one of the side plates (1), and the other end is slidably inserted into a hole provided in the side wall of the other side plate (1), a plurality of sliding shaft seats (17) are slidably installed on the side wall of the fixing strip (21), two bait blocks (10) are fixedly installed on the top surface of the heat conducting plate (8), and a rotating rod (16) is rotatably installed between each of the bait blocks (10) and the two sliding shaft seats (17) opposite thereto; It also includes a driving part, which is used to change the angle between two adjacent rotating rods (16); The driving part comprises a fixed shaft (26) installed between the two side plates (1), and one end of the fixed shaft (26) is fixed to the side wall of one of the side plates (1), and the other end is slidably inserted into a hole opened in the side wall of the other side plate (1); a plurality of sleeves (20) corresponding to the heat conducting plates (8) are installed on the outer wall of the fixed shaft (26), and the sleeves (20) can slide and rotate on the fixed shaft (26); a driven gear (12) is fixedly installed on the outer wall of the sleeve (20); two locking blocks (11) are coaxially installed on both sides of the driven gear (12); an arc groove is opened on the side of the heat conducting plate (8) for the locking blocks (11) to rotate into; and two cams (14) are coaxially installed on the sides of the two locking blocks (11); The driving part also includes a moving frame (13), the moving frame (13) is sleeved on the outer rings of the two locking blocks (11), and the fixed shaft (26) passes through the empty slots on both sides of the moving frame (13), the two cams (14) are respectively located in the empty slots on both sides of the moving frame (13), and are in contact with the inner walls of the empty slots, and a vertical rod (28) for vertically sliding and limiting the moving frame (13) is installed on the top of the heat conducting plate (8); It also comprises a connecting part, which is used to fix the rotating point between the two rotating rods (16) and the moving frame (13).

2. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to claim 1, characterized in that: The connecting part comprises two connecting rods (15) fixedly connected to the two sides of the moving frame (13); sliding blocks (18) are vertically slidably installed on the internal slide rails of the bait blocks (10) on both sides; and the downward ends of two adjacent rotating rods (16) are rotatably connected to the sliding blocks (18) together, and one end of the two connecting rods (15) is fixedly connected to the two sliding blocks (18) respectively.

3. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to claim 1, characterized in that: The connecting part comprises a connecting rod (19) fixedly connected to both sides of the moving frame (13), a sliding groove is provided at the top of the connecting rod (19), a latch (23) is slidably installed in the sliding groove, a slider (29) is vertically slidably installed in the sliding shaft seat (17), the upward ends of two adjacent rotating rods (16) are rotatably connected to the slider (29), and a through hole for inserting the latch (23) is opened on the side wall of the slider (29).

4. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to claim 2 or 3, characterized in that: A rotating shaft (2) is installed between the two side plates (1), and one end of the rotating shaft (2) is rotatably installed on the side wall of one of the side plates (1), and the other end is inserted into a hole opened on the side wall of the other side plate (1). A motor (5) for driving the rotating shaft (2) to rotate is fixedly installed on the side wall of the side plate (1), and two sliding gears (4) that can slide and adjust on the outer wall of the rotating shaft (2) are fixedly installed on the outer wall of the rotating shaft (2), and the sliding gears (4) can mesh with the driven gear (12).

5. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to any one of claims 1 to 3, characterized in that: The elastic member comprises a baffle (27) fixedly mounted on the outer wall of the fixing rod (3), and a spring (25) is provided between the side plate (1) and the nail head at the end of the fixing rod (3).

6. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to claim 3 is characterized in that: A limit tube (22) is fixedly installed in the slide groove, the latch (23) is slidably installed in the limit tube (22), and a threaded handle (24) is fixedly installed on the outer wall of the latch (23).

7. The waste heat recovery and reuse device for flue gas from a thermal power plant boiler according to claim 1, characterized in that: The locking block (11) is composed of two semicircular plates with different diameters, and the distance between the axis of the fixed shaft (26) and the top surface of the heat conducting plate (8) is greater than the distance between the arc surface of the semicircular plate with a smaller radius and the axis of the fixed shaft (26).

8. A method for recovering and reusing waste heat from flue gas in a thermal power plant, characterized in that: The waste heat recovery and reuse device for flue gas from a thermal power plant boiler as claimed in claim 5 is used for treatment, comprising the following steps: Step 1: First, by screwing the nut, the baffle (27) and the nut are clamped together, so that the flue and water channels of the side plate (1) and the heat conducting plate (8) are aggregated, and sealed by the sealing ring (9), so that the high-temperature flue gas and circulating water transfer heat through the heat conducting plate (8); Step 2: When leakage occurs between the heat conducting plates (8), the nuts are turned to loosen the two side plates (1), and the clamping force is continued to be applied to the side plates (1) through the springs (25) on both sides; Step 3: Then, the heat conducting plates (8) on both sides of the leaking heat conducting plate (8) are moved away from each other through the opening and closing assembly. At the same time, the heat conducting plates (8) moving away from each other cooperate with the springs (25) on both sides to apply pressure to the heat conducting plates (8) arranged between the heat conducting plates (8) and the side plates (1), and keep them in a close contact state during the movement; Step 4: After that, the heat conducting plate (8) is replaced and the nut is tightened, and the baffle (27) and the nut are clamped together to complete the reassembly of the device; Step 5: When the heat conducting plate (8) needs to be replaced again, repeat the above steps 1 to 4.

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