Flue gas cooling and discharging device for boiler of thermal power plant

Abstract

The invention discloses a flue gas cooling and discharging device for a boiler of a thermal power plant, and belongs to the technical field of flue gas cooling treatment.The flue gas cooling and discharging device comprises a flue gas passing bin, heat exchange pipeline bodies are evenly installed on the two sides of the interior of the flue gas passing bin, and piston blocks are arranged in the heat exchange pipeline bodies; three-way pipes are evenly installed on the two sides of the smoke passing bin and communicate with the heat exchange pipeline body. The piston block is arranged in the heat exchange pipeline body, and the two conveying mechanisms can intermittently convey the cooling medium into the heat exchange pipeline body, so that in the using process, the cooling medium can intermittently enter from the two ends of the heat exchange pipeline body, and then the cooling task can be completed; and meanwhile, the piston block can intermittently move in the heat exchange pipeline body, so that scraping and brushing cleaning of the inner wall of the heat exchange pipeline body can be automatically completed, and the situation that the follow-up cooling effect is affected due to the fact that scale is easily attached to and accumulated on the inner wall of the heat exchange pipeline body is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas cooling treatment, and in particular relates to a flue gas cooling and emission device for boilers in thermal power plants. Background Art

[0002] Electricity is one of the main energy sources in modern society. With the continuous improvement of electricity-related supporting facilities and applications, more and more equipment uses electricity as the main energy source to drive, such as various factory production equipment, new energy vehicles, etc. There are many production methods for electricity, and thermal power generation is one of the more typical ones. In the process of thermal power generation, boilers are needed to burn fossil fuels. The high-temperature flue gas generated during the combustion process generally cannot be discharged directly, and it needs to be cooled and harmlessly treated. In this process, a thermal power plant boiler flue gas cooling and emission device is needed.

[0003] When the existing boiler flue gas cooling and emission device of a thermal power plant is in use, it generally cools the flue gas by continuously delivering cold water or other heat exchange media to the heat exchange pipe through a water pump. However, in actual application, scale and the like are easily generated inside the pipe due to the flow of cold water or other media. These scales are distributed inside the heat exchange pipe, so it is difficult to clean them in time. Once these scales and the like are attached too much, the heat exchange effect of the heat exchange pipe will be significantly reduced, thereby affecting the subsequent cooling effect. Summary of the invention

[0004] In order to overcome the above defects, the present invention provides a boiler flue gas cooling and discharge device for a thermal power plant, which solves the problem that the inside of the heat exchange pipe of the existing boiler flue gas cooling and discharge device for a thermal power plant is inconvenient to clean.

[0005] To achieve the above object, the present invention provides the following technical solution: a boiler flue gas cooling and discharge device for a thermal power plant, comprising a flue gas passing chamber, heat exchange pipe bodies are evenly installed on both sides of the flue gas passing chamber, and a piston block is arranged inside the heat exchange pipe body;

[0006] Both sides of the smoke passage bin are evenly installed with three-way pipes, and the three-way pipes are connected with the heat exchange pipe body, and a liquid inlet check valve is installed inside the three-way pipe. Both sides of one end of the smoke passage bin are provided with a first installation shaft, and the end of the first installation shaft away from the smoke passage bin is equipped with a first gear;

[0007] The ends of both sides of the smoke passage bin away from the first installation axis are both installed with installation plates, and the two sides of the smoke passage bin close to the first installation axis are both installed with fixing plates;

[0008] The mounting plate is provided with a conveying mechanism for conveying cooling medium into the heat exchange pipe body;

[0009] The mounting plate is provided with a valve mechanism for closing the three-way pipe;

[0010] Limiting grooves are evenly arranged on the outer side of the first installation shaft, and an elastic mechanism for limiting the rotation of the first installation shaft is provided on the fixing plate;

[0011] The smoke passage bin is provided with a driving mechanism for driving the first installation shaft to rotate.

[0012] As a further solution of the present invention: the heat exchange pipe body is wavy, and the heat exchange pipe body and the piston block are slidably connected.

[0013] As a further solution of the present invention: the conveying mechanism includes two groups of second mounting shafts, the second mounting shafts are arranged at one end of the mounting plate close to the three-way pipe, and the second mounting shafts pass through the three-way pipe, a second gear is installed at one end of the second mounting shaft away from the mounting plate, and infusion wheels are evenly installed on the outside of the second mounting shaft, and the infusion wheels are located inside the three-way pipe.

[0014] As a further solution of the present invention: the central axis of the second gear is parallel to the central axis of the first gear, and the second gear is meshingly connected with the first gear.

[0015] As a further solution of the present invention: the valve mechanism includes two groups of third mounting shafts, the third mounting shafts are arranged at one end of the mounting plate close to the three-way pipe, and the third mounting shafts pass through the three-way pipe, and the third gear is installed at the end of the third mounting shaft away from the mounting plate, and the outer side of the third mounting shaft is evenly installed with rotating ball valves, and the rotating ball valve is located inside the three-way pipe.

[0016] As a further solution of the present invention: the valve mechanism also includes two groups of rack bodies, the rack bodies are arranged above the third gear, a first extrusion rod is installed at one end of the rack body away from the third gear, and the first extrusion rod passes through the fixed plate, and a first spring is connected between the rack body and the fixed plate.

[0017] As a further solution of the present invention: the rack body and the first extrusion rod are made in one piece, and the rack body and the third gear are meshingly connected.

[0018] As a further solution of the present invention: the elastic mechanism includes two groups of second extrusion rods, the second extrusion rods penetrate one side of the fixed plate, and the second extrusion rods extend to the inside of the limiting groove, and a second spring is connected between the second extrusion rod and the fixed plate.

[0019] As a further solution of the present invention: the driving mechanism includes a motor, which is installed at the middle position of the smoke passing bin near one end of the first mounting shaft, the output end of the motor is connected to the output shaft, and the end of the output shaft away from the smoke passing bin is installed with a mounting disk, the top of the outer wall of the mounting disk is installed with an arc-shaped rack, the end of the mounting disk close to the smoke passing bin is installed with a first notch extrusion piece, and the end of the first notch extrusion piece close to the smoke passing bin is installed with a second notch extrusion piece.

[0020] As a further solution of the present invention: the arc center of the arc-shaped rack coincides with the center of the circle of the mounting plate, and the arc length of the arc-shaped rack is less than half of the circumference of the mounting plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. A piston block is arranged in the heat exchange pipe body, and two sets of conveying mechanisms can intermittently convey cooling medium into the heat exchange pipe body, so that during use, the cooling medium can intermittently enter from both ends of the heat exchange pipe body, thereby completing the cooling task. At the same time, the piston block can intermittently move in the heat exchange pipe body, so as to autonomously complete the scraping and cleaning of the inner wall of the heat exchange pipe body, thereby preventing the inner wall of the heat exchange pipe body from easily adhering to the accumulation of scale and affecting the subsequent cooling effect.

[0023] 2. The arc length of the arc-shaped rack is less than half of the circumference of the mounting plate, so that the cooling medium will stay inside the heat exchange pipe body for a period of time. Different from the existing similar equipment, this method can make the cooling medium more fully implement the heat exchange task, thereby reducing the waste of cooling medium, ensuring the heat absorption of the cooling medium, and thus ensuring the further use of the subsequent energy of the cooling medium.

[0024] 3. The heat exchange pipe body is in a wavy shape, so that the heat exchange pipe body can maintain a longer path in the flue gas passage chamber, thereby ensuring the heat exchange area of ​​the heat exchange pipe body, and further ensuring the heat exchange effect with the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0028] Figure 4 The present invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0029] Figure 5It is a schematic diagram of the main cross-sectional structure of the three-way pipe of the present invention;

[0030] Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure at B;

[0031] Figure 7 It is a schematic diagram of the rear structural view of the second notched extrusion component of the present invention.

[0032] In the figure: 1. Smoke passes through the bin; 2. Heat exchange pipe body; 3. Piston block; 4. Tee pipe; 5. Liquid inlet check valve; 6. First mounting shaft; 7. First gear; 8. Limiting groove; 9. Mounting plate; 10. Fixed plate; 11. Second mounting shaft; 12. Second gear; 13. Infusion wheel; 14. Third mounting shaft; 15. Third gear; 16. Rotating ball valve; 17. Rack body; 18. First extrusion rod; 19. First spring; 20. Second extrusion rod; 21. Second spring; 22. Motor; 23. Output shaft; 24. Mounting plate; 25. Arc rack; 26. First notch extrusion piece; 27. Second notch extrusion piece. DETAILED DESCRIPTION

[0033] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0034] like Figure 1-Figure 7 As shown, the present invention provides a technical solution:

[0035] Example 1

[0036] A thermal power plant boiler flue gas cooling and emission device comprises a flue gas passage chamber 1, heat exchange pipe bodies 2 are evenly installed on both sides of the flue gas passage chamber 1, and a piston block 3 is arranged inside the heat exchange pipe body 2. The flue gas passage chamber 1 can be installed in the middle of a thermal power generation flue gas emission pipe system to participate in the flue gas treatment process. The heat exchange pipe body 2 can be made of a metal material with a better heat exchange effect.

[0037] Tee pipes 4 are evenly installed on both sides of the smoke passage bin 1, and the three-way pipes 4 are connected to the heat exchange pipe body 2. A liquid inlet check valve 5 is installed inside the three-way pipe 4. First installation shafts 6 are arranged on both sides of one end of the smoke passage bin 1, and a first gear 7 is installed on the end of the first installation shaft 6 away from the smoke passage bin 1. The end of the three-way pipe 4 away from the heat exchange pipe body 2 is connected to the cooling medium supply device, and the opening at the bottom of the three-way pipe 4 is connected to the cooling medium recovery device. The cooling medium can be a common substance such as water, and it is convenient to reuse it after heat exchange recovery, such as participating in indoor heating, etc. The first installation shaft 6 is connected to the smoke passage bin 1 by a thrust bearing to ensure its stability during rotation;

[0038] Mounting plates 9 are installed on both ends of the flue gas passage chamber 1 away from the first mounting shaft 6, and fixing plates 10 are installed on both sides of the flue gas passage chamber 1 close to the first mounting shaft 6. A conveying mechanism for conveying cooling medium into the heat exchange pipe body 2 is arranged on the mounting plate 9. The conveying mechanism includes two sets of second mounting shafts 11. The second mounting shaft 11 is arranged at one end of the mounting plate 9 close to the three-way pipe 4, and the second mounting shaft 11 penetrates the three-way pipe 4. A second gear 12 is installed at one end of the second mounting shaft 11 away from the mounting plate 9. Infusion wheels 13 are evenly installed on the outer side of the second mounting shaft 11, and the infusion wheels 13 are located inside the three-way pipe 4, so that when the second mounting shaft 11 rotates, the corresponding multiple sets of infusion wheels 13 thereon can rotate accordingly, thereby pushing the cooling medium through the three-way pipe 4 to open the liquid inlet one-way valve 5 and enter the interior of the heat exchange pipe body 2. Similarly, the second mounting shaft 11 and the mounting plate 9 are connected and installed through a thrust bearing;

[0039] The central axis of the second gear 12 is parallel to the central axis of the first gear 7, and the second gear 12 is meshed with the first gear 7, so that when the corresponding first installation shaft 6 rotates, the corresponding second installation shaft 11 can complete the rotation task;

[0040] A valve mechanism for closing the three-way pipe 4 is provided on the mounting plate 9, and the valve mechanism includes two groups of third mounting shafts 14, the third mounting shaft 14 is provided at one end of the mounting plate 9 close to the three-way pipe 4, and the third mounting shaft 14 penetrates the three-way pipe 4, and a third gear 15 is provided at one end of the third mounting shaft 14 away from the mounting plate 9, and a rotating ball valve 16 is evenly installed on the outer side of the third mounting shaft 14, and the rotating ball valve 16 is located inside the three-way pipe 4, and the third mounting shaft 14 is connected and installed with the mounting plate 9 through a thrust bearing, and when the third mounting shaft 14 rotates, the corresponding multiple groups of rotating ball valves 16 thereon can be rotated, and the corresponding openings at the bottom of the three-way pipe 4 are opened, so that the cooling medium after heat exchange enters the recovery device through the opening at the bottom of the three-way pipe 4;

[0041] The valve mechanism also includes two groups of rack bodies 17, the rack bodies 17 are arranged above the third gear 15, a first extrusion rod 18 is installed at one end of the rack body 17 away from the third gear 15, and the first extrusion rod 18 penetrates the fixed plate 10, a first spring 19 is connected between the rack body 17 and the fixed plate 10, the rack body 17 and the first extrusion rod 18 are made as one piece, and the rack body 17 and the third gear 15 are meshingly connected, the first extrusion rod 18 and the corresponding fixed plate 10 are slidably connected, when the first extrusion rod 18 is not subjected to corresponding extrusion, the first spring 19 will drive the rack body 17 to slide, so that the third mounting shaft 14 rotates accordingly until the corresponding rotating ball valve 16 thereon is in an open state;

[0042] Limiting grooves 8 are evenly provided on the outer side of the first installation shaft 6, and an elastic mechanism for limiting the rotation of the first installation shaft 6 is arranged on the fixing plate 10. The elastic mechanism includes two groups of second extrusion rods 20. The second extrusion rod 20 runs through one side of the fixing plate 10, and the second extrusion rod 20 extends to the inside of the limiting groove 8. A second spring 21 is connected between the second extrusion rod 20 and the fixing plate 10. The second extrusion rod 20 is slidably connected to the corresponding fixing plate 10. When the second extrusion rod 20 is not subjected to corresponding extrusion, the second extrusion rod 20 will leave the corresponding limiting groove 8, thereby releasing the rotation restriction on the corresponding first installation shaft 6. When the second extrusion rod 20 is subjected to corresponding extrusion and enters the limiting groove 8, the rotation of the first installation shaft 6 will be restricted, thereby preventing the first installation shaft 6 from rotating autonomously when it is not rotating and affecting subsequent transmission.

[0043] The smoke passage bin 1 is provided with a driving mechanism for driving the first mounting shaft 6 to rotate, and the driving mechanism includes a motor 22, which is installed at the middle position of the smoke passage bin 1 near one end of the first mounting shaft 6, and the output end of the motor 22 is connected to the output shaft 23, and the end of the output shaft 23 away from the smoke passage bin 1 is installed with a mounting plate 24, and the top of the outer wall of the mounting plate 24 is installed with an arc-shaped rack 25, and the end of the mounting plate 24 close to the smoke passage bin 1 is installed with a first notch extrusion piece 26, and the end of the first notch extrusion piece 26 close to the smoke passage bin 1 is installed with a second notch extrusion piece 27, and the tooth block on the arc-shaped rack 25 corresponds to the tooth block on the first gear 7, so that when the arc-shaped rack 25 rotates to a specified position, it can mesh with the corresponding first gear 7, thereby driving the corresponding first gear 7 to rotate, and the first gear 7 further drives the second mounting shaft 11 to rotate, thereby completing the task of infusion in the heat exchange pipeline body 2;

[0044] It should be noted that the notch of the first notch extrusion piece 26 is oriented in the same direction as the arc-shaped rack 25, so that when the arc-shaped rack 25 is not meshed with the corresponding first gear 7, the first notch extrusion piece 26 always keeps squeezing the corresponding second extrusion rod 20, so that the second extrusion rod 20 is located in the corresponding limiting groove 8, so that the first mounting shaft 6 is in a state of restricted rotation. When the arc-shaped rack 25 is meshed with a group of first gears 7, the first notch extrusion piece 26 no longer squeezes the second extrusion rod 20 on the same side, so that the second extrusion rod 20 leaves the corresponding limiting groove 8, and the rotation restriction of the first mounting shaft 6 on this side is released, so that the arc-shaped rack 25 can drive the first gear 7 on this side to rotate. The notch of the second notch extrusion piece 27 is oriented opposite to the arc-shaped rack 25, so that when the arc-shaped rack 25 is meshed with a group of first gears 7 on one side, it drives the corresponding group of first gears 7 to rotate. When the second mounting shaft 11 rotates, the second notched extrusion piece 27 releases the extrusion of the first extrusion rod 18 on the other side, so that the first extrusion rod 18 drives the rack body 17 to move laterally and drives the third mounting shaft 14 on the other side to rotate, so that the lower openings of the multiple groups of three-way pipes 4 on the other side are opened, and then when the three-way pipe 4 on one side starts to transport the cooling medium into the heat exchange pipe body 2, the opening below the three-way pipe 4 on the other side is opened, and the coolant medium flows out from the three-way pipe 4 on this side for recovery. As the mounting plate 24 drives the arc-shaped rack 25 to rotate continuously, the three-way pipes 4 on both sides intermittently transport the cooling medium into the heat exchange pipe body 2, or intermittently discharge the cooling medium outward. In this process, the piston block 3 in the heat exchange pipe body 2 can move laterally driven by the cooling medium, thereby completing the scraping and cleaning task of the inner wall of the heat exchange pipe body 2.

[0045] Example 2

[0046] The arc center of the arc-shaped rack 25 coincides with the center of the circle of the mounting plate 24, and the arc length of the arc-shaped rack 25 is less than half of the circumference of the mounting plate 24, so that during use, there is a period of time when the arc-shaped rack 25 does not mesh with any of the two groups of first gears 7, and during this process, the two groups of three-way pipes 4 will not simultaneously transport cooling medium into the heat exchange pipe body 2, and the openings below the two groups of three-way pipes 4 are in a closed state, so that the cooling medium will stay inside the heat exchange pipe body 2 for a period of time, so as to more fully exchange heat with the passing flue gas, and at the same time ensure that the cooling medium itself is heated to a specified temperature, so as to facilitate its subsequent further use, such as participating in indoor heating and other tasks;

[0047] Example 3

[0048] The heat exchange pipe body 2 is wavy, and the heat exchange pipe body 2 and the piston block 3 are slidably connected, so that the heat exchange pipe body 2 can fully cover the internal space of the smoke passing through the bin 1 with the least amount possible, thereby ensuring the release area of ​​the smoke and the heat exchange pipe body 2 during the passing process, thereby ensuring its heat exchange effect.

[0049] Working principle of the present invention: the device is powered by an external power supply or a battery. When in use, the smoke passage chamber 1 is connected to the smoke treatment pipeline system to ensure that the smoke can pass through the smoke passage chamber 1, the opening of the three-way pipe 4 away from the side of the smoke passage chamber 1 is connected to the coolant supply device, and the bottom opening of the three-way pipe 4 is connected to the coolant recovery device, and the motor 22 is turned on. The motor 22 drives the output shaft 23 and the mounting plate 24, the arc-shaped rack 25, the first notch extrusion member 26 and the second notch extrusion member 27 thereon to rotate continuously. When the arc-shaped rack 25 is about to mesh with a group of first gears 7 on one side, as mentioned above, the first notch extrusion member 26 releases the extrusion of the second extrusion rod 20 on the same side, so that the rotation restriction of the group of first gears 7 is released, and at the same time, the second notch extrusion member 27 releases the extrusion of the first extrusion rod 18 on the other side, and the rack body 17 on the other side drives the The corresponding third installation shaft 14 rotates, so that the rotating ball valve 16 on the three-way pipe 4 on the other side rotates and opens, and then the first gear 7 on this side rotates to drive the second installation shaft 11 on the same side to rotate, so that the multiple groups of infusion wheels 13 in the three-way pipe 4 on this side rotate to transport coolant into the heat exchange pipe body 2. Under the push of the coolant, the piston block 3 in the heat exchange pipe body 2 moves from this side to the other side and scrapes the inner wall of the heat exchange pipe body 2. When the arc-shaped rack 25 starts to mesh with the first gear 7 on the other side, the two groups of three-way pipes 4 have opposite actions to the above, so that the coolant flows in from the other end of the heat exchange pipe body 2 and drives the piston block 3 in the heat exchange pipe body 2 to move another stroke, and the scraping and cleaning task is performed again. The above operation is continuously performed, so that the coolant can flow in and out continuously, the heat exchange task is completed, and the cleaning and scraping task in the heat exchange pipe body 2 is intermittently completed.

[0050] In the above process, there is a period of time when the arc-shaped rack 25 is not meshed with any of the two groups of first gears 7 at the same time. During this process, the coolant will stay in the heat exchange pipe body 2 for a period of time, thereby ensuring sufficient heat exchange of the coolant, thereby avoiding excessive waste of cooling, and at the same time ensuring that the coolant can be heat exchanged to the specified temperature, so as to facilitate the subsequent use of the heat therein.

[0051] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A boiler flue gas cooling and discharge device for a thermal power plant, comprising a flue gas passage chamber (1), characterized in that: The heat exchange pipe body (2) is evenly installed on both sides of the interior of the smoke passage bin (1), and a piston block (3) is arranged inside the heat exchange pipe body (2); Both sides of the smoke passage bin (1) are evenly installed with three-way pipes (4), and the three-way pipes (4) are connected with the heat exchange pipe body (2), and a liquid inlet non-return valve (5) is installed inside the three-way pipe (4), and both sides of one end of the smoke passage bin (1) are provided with a first installation shaft (6), and a first gear (7) is installed at the end of the first installation shaft (6) away from the smoke passage bin (1); Both ends of the smoke passage bin (1) away from the first mounting shaft (6) are equipped with mounting plates (9), and both ends of the smoke passage bin (1) close to the first mounting shaft (6) are equipped with fixing plates (10); The mounting plate (9) is provided with a conveying mechanism for conveying cooling medium into the heat exchange pipe body (2); The mounting plate (9) is provided with a valve mechanism for closing the three-way pipe (4); Limiting grooves (8) are evenly arranged on the outer side of the first installation shaft (6), and an elastic mechanism for limiting the rotation of the first installation shaft (6) is provided on the fixing plate (10); The smoke passage bin (1) is provided with a driving mechanism for driving the first mounting shaft (6) to rotate.

2. A thermal power plant boiler flue gas cooling and discharge device according to claim 1, characterized in that: The heat exchange pipe body (2) is wavy in shape, and the heat exchange pipe body (2) and the piston block (3) are slidably connected.

3. A thermal power plant boiler flue gas cooling and discharge device according to claim 1, characterized in that: The conveying mechanism comprises two groups of second mounting shafts (11), wherein the second mounting shafts (11) are arranged at one end of the mounting plate (9) close to the three-way pipe (4), and the second mounting shafts (11) penetrate the three-way pipe (4), and a second gear (12) is installed at one end of the second mounting shaft (11) away from the mounting plate (9), and infusion wheels (13) are evenly installed on the outer side of the second mounting shaft (11), and the infusion wheels (13) are located inside the three-way pipe (4).

4. A thermal power plant boiler flue gas cooling and discharge device according to claim 3, characterized in that: The central axis of the second gear (12) is parallel to the central axis of the first gear (7), and the second gear (12) and the first gear (7) are meshingly connected.

5. The device for cooling and discharging flue gas from a boiler in a thermal power plant according to claim 1, characterized in that: The valve mechanism comprises two groups of third mounting shafts (14), wherein the third mounting shafts (14) are arranged at one end of the mounting plate (9) close to the three-way pipe (4), and the third mounting shafts (14) penetrate the three-way pipe (4), and a third gear (15) is installed at one end of the third mounting shaft (14) away from the mounting plate (9), and a rotating ball valve (16) is evenly installed on the outer side of the third mounting shaft (14), and the rotating ball valve (16) is located inside the three-way pipe (4).

6. A thermal power plant boiler flue gas cooling and discharge device according to claim 5, characterized in that: The valve mechanism further comprises two groups of rack bodies (17), wherein the rack bodies (17) are arranged above the third gear (15), and a first extrusion rod (18) is installed at one end of the rack body (17) away from the third gear (15), and the first extrusion rod (18) passes through the fixed plate (10), and a first spring (19) is connected between the rack body (17) and the fixed plate (10).

7. A thermal power plant boiler flue gas cooling and discharge device according to claim 6, characterized in that: The rack body (17) and the first extrusion rod (18) are made in one piece, and the rack body (17) and the third gear (15) are meshingly connected.

8. The device for cooling and discharging flue gas from a boiler in a thermal power plant according to claim 1, characterized in that: The elastic mechanism comprises two groups of second extrusion rods (20), wherein the second extrusion rods (20) penetrate one side of the fixing plate (10), and the second extrusion rods (20) extend to the inside of the limiting groove (8), and a second spring (21) is connected between the second extrusion rods (20) and the fixing plate (10).

9. The device for cooling and discharging flue gas from a boiler in a thermal power plant according to claim 1, characterized in that: The driving mechanism comprises a motor (22), the motor (22) being mounted at a middle position of a smoke passage bin (1) close to one end of a first mounting shaft (6), the output end of the motor (22) being connected to an output shaft (23), and an mounting plate (24) being mounted at one end of the output shaft (23) away from the smoke passage bin (1), an arc-shaped rack (25) being mounted at the top of an outer wall of the mounting plate (24), a first notch extrusion piece (26) being mounted at one end of the mounting plate (24) close to the smoke passage bin (1), and a second notch extrusion piece (27) being mounted at one end of the first notch extrusion piece (26) close to the smoke passage bin (1).

10. A thermal power plant boiler flue gas cooling and discharge device according to claim 9, characterized in that: The arc center of the arc-shaped rack (25) coincides with the circle center of the mounting plate (24), and the arc length of the arc-shaped rack (25) is less than half the circumference of the mounting plate (24).

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