A heat exchange device in an air preheater

Abstract

The present invention discloses a heat exchange device in an air preheater, belonging to the technical field of air preheaters. The heat exchange device in the air preheater comprises a shell, the interior of the shell is a hollow structure, and the top and bottom of the shell are in an open state, a heat dissipation component is arranged inside the shell, a heat exchange optimization mechanism is rotatably connected inside the shell, and the heat dissipation component is rotatably connected to the heat exchange optimization mechanism; the heat dissipation component comprises a heat dissipation pipe, a plurality of arc plates are welded to the middle of the outer wall of the heat dissipation pipe, a plurality of the arc plates are arranged in a circumferentially symmetrical distribution, and the arc plates are arranged in an inclined manner, a knocking rod is fixedly connected to one side of the torsion spring member, and the knocking rod is located at the top of the heat dissipation pipe. The present invention can adapt to the heat transfer requirements under different working conditions by adopting a heat dissipation component and a heat exchange optimization mechanism, and at the same time, reduce the accumulation of particulate matter in the flue gas on the inner wall of the heat dissipation pipe, reduce maintenance costs, and improve heat transfer efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of air preheaters, and in particular relates to a heat exchange device in an air preheater. Background Art

[0002] An air preheater is a heating surface that preheats the flue gas in the flue at the tail end of the boiler to a certain temperature through the internal heat sink. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. Air preheaters are generally divided into three types: plate, rotary and tube types. They use heat exchange devices to exchange cold intake or exhaust gas with hot exhaust or waste gas, thereby improving combustion efficiency and energy utilization. By preheating the intake or exhaust gas, the heat exchange device can reduce fuel costs and operating costs. For industrial production processes that require high temperature or specific temperature requirements, the use of heat exchange devices in air preheaters can further heat while improving the overall efficiency and production capacity of industrial equipment, helping to reduce production costs and improve competitiveness.

[0003] The heat exchange device in the existing air preheater is often composed of multiple heat dissipation tubes and a shell, which are welded and fixed. The flue gas flows through the heat dissipation tube, and the cold air outside the tube flows through the shell. Heat exchange is achieved through heat transfer through the tube wall. However, due to long-term use, dust, dirt and other impurities in the flue gas will accumulate on the surface of the inner wall of the heat dissipation tube. These accumulations may hinder the surface of the heat dissipation tube, reduce heat transfer efficiency, increase energy consumption, and may cause system failure. In addition, after multiple heat dissipation tubes and the shell are welded and fixed, and the space between the multiple heat dissipation tubes is fixed, the optimal heat transfer effect under different working conditions cannot be met. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a heat exchange device in an air preheater which improves heat exchange efficiency, reduces maintenance costs and prolongs the service life of the equipment.

[0005] The technical solution adopted to solve the above technical problems is: a heat exchange device in an air preheater, comprising a shell, the interior of the shell is a hollow structure, and the top and bottom ends of the shell are open, a heat dissipation component is arranged inside the shell, a heat exchange optimization mechanism is rotatably connected inside the shell, and the heat dissipation component is rotatably connected to the heat exchange optimization mechanism;

[0006] The heat dissipation assembly includes a heat dissipation pipe, a plurality of arc-shaped plates are welded to the middle of the outer wall of the heat dissipation pipe, the plurality of arc-shaped plates are arranged in a circumferentially symmetrical distribution, and the arc-shaped plates are arranged in an inclined manner, a moving block is rotatably connected to both ends of the heat dissipation pipe, a fixed block is arranged on one side of the heat dissipation pipe, the fixed block is fixedly connected to the moving block, one end of the fixed block is rotatably connected to a torsion spring, one side of the torsion spring is fixedly connected to a knocking rod, and the knocking rod is located at the top of the heat dissipation pipe;

[0007] The heat exchange optimization mechanism includes a plurality of synchronous wheels, which are symmetrically arranged and rotatably connected to the shell. A second connecting rod is fixedly connected to the synchronous wheel away from the shell, and a first connecting rod is rotatably connected to one side of the second connecting rod and the synchronous wheel connection end.

[0008] Through the above technical solution, the arc plate welded on the heat pipe can increase the contact area between the cold air and the heat pipe, so that the cold air can more fully contact the heat pipe when entering through the bottom of the shell, effectively improving the heat transfer efficiency. Moreover, by improving the heat dissipation efficiency, the temperature distribution inside the shell is more uniform and stable, which helps to prevent thermal stress caused by excessive temperature gradient.

[0009] Furthermore, a main gear is fixedly connected to the connection between the heat dissipation tube and the moving block, the interior of the heat dissipation tube is communicated with the main gear and the interior of the moving block, one side of the main gear is transmission-connected with a sub-gear, the sub-gear is located at the bottom of the main gear, and a connecting column is fixedly connected to the side of the sub-gear away from the moving block, and the other end of the connecting column is fixedly connected to a ratchet.

[0010] Through the above technical solution, the flue gas enters the heat dissipation pipe from the flue gas inlet surface, passes through the main gear and the moving block, and is discharged from the flue gas outlet surface. In the process of the flue gas passing through the heat dissipation pipe, the heat energy in the flue gas is transferred to the heat dissipation pipe, so that the temperature of the exhausted flue gas is reduced, which can reduce the thermal pollution to the surrounding environment and avoid adverse effects on the surrounding ecosystem.

[0011] Furthermore, a swinging piece is arranged on the top of the ratchet, the swinging piece is engaged with the ratchet, one side of the swinging piece is fixedly connected to the torsion spring piece, the swinging piece is located at the bottom of the center of the torsion spring piece, and the knocking rod is arranged at an angle.

[0012] Furthermore, a plurality of limit grooves are formed through the inner side wall of the shell, and the limit grooves are linearly and equally divided. The movable block is slidably connected to the shell, one end of the movable block is located in the limit groove, and the shell limits the movable block. Connecting rods are fixedly connected between the plurality of movable blocks, and a through hole is formed through the end surface connecting the movable block and the shell.

[0013] Through the above technical scheme, after the cold air enters the shell from the cold air inlet surface, the arc plate drives the arc plate and the heat dissipation pipe to rotate toward the fixed block at the same time under the action of the arc plate. When the heat dissipation pipe rotates, the main gear rotates at the same time, driving the sub-gear on one side to rotate in the opposite direction. Under the action of the connecting column, the ratchet rotates synchronously with the sub-gear, prompting the ratchet to move the swinging part on the top. In the process of moving, due to the action of the torsion spring in the torsion spring part, the knocking rod on one side of the torsion spring part repeatedly knocks the heat dissipation pipe, which can effectively loosen the scale and sediment in the heat dissipation pipe, prevent it from clogging the heat dissipation pipe, and keep the heat dissipation pipe unobstructed.

[0014] Furthermore, the moving block is rotatably connected to a third connecting rod on the same surface as the synchronous wheel, the center of the third connecting rod is rotatably connected to the moving block, the other side of the third connecting rod is rotatably connected to a fourth connecting rod, one end of one of the fourth connecting rods is rotatably connected to the first connecting rod, one of the third connecting rods is rotatably connected to the second connecting rod, and the third connecting rod that is not connected to the second connecting rod and the fourth connecting rod are rotatably connected in a cross manner.

[0015] Through the above technical solution, by adjusting the spacing of the heat transfer tubes in one direction, the heat transfer area can be flexibly adjusted according to actual needs to adapt to different working conditions. This can improve the heat exchange efficiency of the preheater and ensure that the best heat transfer performance can be obtained under different working conditions. In addition, the density of the heat transfer tubes can be increased at positions where a larger heat transfer area is required, thereby reducing the resistance of the flue gas in the tube bundle, reducing the pressure drop on the flue gas side, and improving the performance of the entire preheater.

[0016] Furthermore, a shielding assembly is provided in the through hole, and the shielding assembly includes a plurality of connecting plates, the connecting plates are slidably connected to the shell, the through ends of the heat dissipation pipes are rotatably connected to the connecting plates, a first accordion cover is fixedly connected between the plurality of connecting plates, one end of one of the first accordion covers is fixedly connected to the shell, one end of one of the connecting plates is fixedly connected to the second accordion cover, the other end of the second accordion cover is fixedly connected to the shell, the first accordion cover and the second accordion cover are slidably connected to the shell, and the first accordion cover and the second accordion cover are made of high temperature resistant flexible material.

[0017] Through the above technical solution, the first accordion cover and the second accordion cover can effectively cover the space between the heat dissipation tubes. When the smoke enters from the smoke inlet surface, the smoke can be effectively blocked from entering the through hole from the space between the heat dissipation tubes, thereby forming an air leakage channel. In this case, the smoke may bypass part of the heat dissipation tubes, resulting in a decrease in heat exchange efficiency and may cause unexpected operational problems. By using the accordion cover to cover the gap, this type of smoke leakage can be reduced to ensure the normal operation of the heat exchange system. In addition, the first accordion cover and the second accordion cover cover the space between the heat dissipation tubes, which can effectively guide the smoke and make it evenly distributed between the heat dissipation tubes, thereby improving the heat exchange efficiency.

[0018] Furthermore, a plurality of mounting parts are fixedly connected to both sides of the outer wall of the shell, and the plurality of mounting parts are symmetrically arranged in pairs. One side of the shell is set as a smoke inlet surface, and a side of the shell away from the smoke inlet surface is set as a smoke outlet surface, and the top and bottom of the shell are respectively set as a hot air outlet surface and a cold air inlet surface.

[0019] Through the above technical solution, the heat in the flue gas is used to heat the air entering the shell, thereby reducing the additional energy required by the system, which not only saves energy but also reduces energy costs and carbon emissions.

[0020] Furthermore, a fixing plate is fixedly connected to the bottom of one side of the shell, and the end of the fixing plate away from the shell is rotatably connected to a driven wheel, a synchronous belt is transmission-connected between several of the synchronous wheels and the driven wheels, and a triangular structure is arranged between several of the synchronous wheels and the driven wheels, and a handle is rotatably connected to the side of the fixing plate away from the driven wheel, and the through end of the handle is fixedly connected to the driven wheel.

[0021] Through the above technical solution, the staff manually rotates the handle to rotate the driven wheel, which in turn drives the synchronous wheels on both sides to rotate, prompting the second connecting rod to follow and rotate simultaneously. Under the joint action of the first connecting rod, the third connecting rod and the fourth connecting rod, the moving block is pushed to move in the limit groove of the inner wall of the shell, and the moving distances between the moving blocks are the same, thereby realizing the distance control between the heat dissipation pipes, allowing the staff to adjust the spacing of the heat dissipation pipes according to actual needs to adapt to the heat transfer requirements under different working conditions. Compared with automatic adjustment control, manual adjustment control is usually lower in cost, and the installation and maintenance costs are also lower, which makes the overall investment cost of the air preheater more economical.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The present invention adopts a heat exchange optimization mechanism. The staff manually turns the handle to drive the driven wheel to follow the synchronous rotation. Under the action of the synchronous belt, the synchronous wheels on both sides of the shell rotate simultaneously, prompting the second connecting rod to follow the rotation. Since the second connecting rod and the third connecting rod are rotationally connected, a plurality of third connecting rods and the fourth connecting rods are rotationally connected, and one of the fourth connecting rods is rotationally connected to the first connecting rod, when the second connecting rod rotates, the first connecting rod, the third connecting rod and the fourth connecting rod rotate simultaneously, so that the moving block slides in the limit groove of the inner wall of the shell. At the same time, the first accordion cover and the second accordion cover located inside the through hole are telescopically deformed, so that the spacing of the heat dissipation pipes can be adjusted in time according to actual conditions, thereby reducing the energy consumption of the system and being able to adapt to the heat transfer requirements under different working conditions;

[0024] (2) The present invention adopts a heat dissipation component. When cold air passes through the heat dissipation pipe, under the action of the arc plate, the cold air pushes the heat dissipation pipe to rotate in the direction of the fixed block, and the main gear follows and rotates synchronously, so that the secondary gear rotates in the opposite direction. Under the action of the connecting column, the ratchet follows the secondary gear and rotates in the same direction at the same time. When the ratchet rotates, it repeatedly toggles the swinging part. Under the action of the torsion spring part, the swinging part makes a swinging motion, so that the knocking rod makes a knocking motion on the heat dissipation pipe. The subsequent flue gas continues to pass through the heat dissipation pipe, and then the dust and accumulation are blown out of the heat dissipation pipe, which can reduce the accumulation of particulate matter in the flue gas on the inner wall of the heat dissipation pipe, keep the inner wall surface of the heat dissipation pipe clean, improve the heat transfer efficiency, extend the service life of the equipment, and reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first perspective structural diagram of the present invention;

[0026] Figure 2 It is a second viewing angle structural diagram of the present invention;

[0027] Figure 3 It is a partial structural diagram of the present invention;

[0028] Figure 4 yes Figure 3 A magnified structural diagram;

[0029] Figure 5 This is a structural diagram of the heat dissipation assembly of the present invention from a first perspective;

[0030] Figure 6 is a structural diagram of the heat dissipation assembly of the present invention from a second viewing angle;

[0031] Figure 7 yes Figure 5 The enlarged structure diagram at B;

[0032] Figure 8 yes Figure 6 The enlarged structure diagram at C;

[0033] Fig. 9 This is a partial first-view structural diagram of the heat exchange optimization mechanism of the present invention;

[0034] Fig.10 This is a partial second-view structural diagram of the heat exchange optimization mechanism of the present invention;

[0035] Fig.11 This is a structural diagram of the shielding component of the present invention from a first viewing angle;

[0036] Fig.12 This is a structural diagram of the shielding component of the present invention from a second viewing angle.

[0037] 1. Shell; 2. Smoke inlet surface; 3. Cold air inlet surface; 4. Hot air outlet surface; 5. Smoke outlet surface; 6. Mounting member; 7. Shielding assembly; 8. Heat dissipation assembly; 9. Fixed plate; 10. Driven wheel; 11. Handle; 12. Synchronous wheel; 13. Limiting groove; 14. Moving block; 15. Connecting rod; 16. First connecting rod; 17. Second connecting rod; 18. Third connecting rod; 19. Fourth connecting rod; 20. Through hole; 21. Synchronous belt; 71. Connecting plate; 72. First accordion cover; 73. Second accordion cover; 81. Heat dissipation pipe; 82. Arc plate; 83. Main gear; 84. Sub-gear; 85. Connecting column; 86. Ratchet; 87. Swinging member; 88. Torsion spring member; 89. Fixed block; 810. Knocking rod. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] like Figures 1 to 4As shown, a heat exchange device in an air preheater of the present embodiment includes a shell 1. The interior of the shell 1 is a hollow structure, and the top and bottom ends of the shell 1 are open. A plurality of mounting members 6 are fixedly connected to both sides of the outer wall of the shell 1. The plurality of mounting members 6 are symmetrically arranged in pairs. One side of the shell 1 is arranged as a smoke inlet surface 2, and the side of the shell 1 away from the smoke inlet surface 2 is arranged as a smoke outlet surface 5. The top and bottom ends of the shell 1 are respectively arranged as a hot air outlet surface 4 and a cold air inlet surface 3. A fixing plate 9 is fixedly connected to the bottom of one side of the shell 1. The heat in the smoke is used to heat the air entering the shell 1, thereby reducing the additional energy required for the system, which not only saves energy but also reduces energy costs and carbon emissions. The end of the fixed plate 9 away from the housing 1 is rotatably connected to the driven wheel 10, and a plurality of synchronous wheels 12 are connected to the driven wheel 10 by a synchronous belt 21. The plurality of synchronous wheels 12 and the driven wheel 10 are arranged in a triangular structure. The side of the fixed plate 9 away from the driven wheel 10 is rotatably connected to a handle 11, allowing the staff to adjust the spacing of the heat pipe 81 according to actual needs to adapt to the heat transfer requirements under different working conditions. Compared with automatic adjustment control, manual adjustment control is usually less expensive, and the installation and maintenance costs are also lower, which makes the overall investment cost of the air preheater more economical. The penetration of the handle 11 The end is fixedly connected to the driven wheel 10, and the staff manually rotates the handle 11 to rotate the driven wheel 10, thereby driving the synchronous wheels 12 on both sides to rotate, prompting the second connecting rod 17 to follow and rotate simultaneously, and under the joint action of the first connecting rod 16, the third connecting rod 18 and the fourth connecting rod 19, the moving block 14 is pushed to move in the limiting groove 13 on the inner wall of the shell 1, and the moving distances between the moving blocks 14 are the same, thereby realizing the distance control between the heat dissipation pipes 81, and a heat dissipation component 8 is arranged inside the shell 1, and a heat exchange optimization mechanism is rotatably connected inside the shell 1, and the heat dissipation component 8 is rotatably connected to the heat exchange optimization mechanism;

[0040] like Figures 5 to 8As shown, the heat dissipation assembly 8 includes a heat dissipation pipe 81, and a main gear 83 is fixedly connected to the connection between the heat dissipation pipe 81 and the moving block 14. The interior of the heat dissipation pipe 81 is connected with the main gear 83 and the interior of the moving block 14. A sub-gear 84 is transmission-connected to one side of the main gear 83, and the sub-gear 84 is located at the bottom of the main gear 83. A connecting column 85 is fixedly connected to the side of the sub-gear 84 away from the moving block 14, and a ratchet 86 is fixedly connected to the other end of the connecting column 85. A swinging piece 87 is arranged on the top of the ratchet 86, and the swinging piece 87 is engaged with the ratchet 86. One side of the swinging piece 87 is fixedly connected to a torsion spring piece 88, and the swinging piece 87 is located at the bottom of the center of the torsion spring piece 88. The knocking rod 810 is arranged at an angle, and the cold air enters the shell from the cold air inlet surface 3. 1, under the action of the arc plate 82, the arc plate 82 and the heat dissipation tube 81 are driven to rotate toward the fixed block 89 at the same time. When the heat dissipation tube 81 rotates, the main gear 83 rotates at the same time, driving the sub-gear 84 on one side to rotate in the opposite direction. Under the action of the connecting column 85, the ratchet 86 rotates synchronously with the sub-gear 84, prompting the ratchet 86 to move the top swinging member 87. In the process of moving, due to the action of the torsion spring in the torsion spring member 88, the knocking rod 810 on one side of the torsion spring member 88 repeatedly knocks the heat dissipation tube 81, which can effectively loosen the scale and sediment in the heat dissipation tube 81 to prevent it from clogging the heat dissipation tube 81, keep the heat dissipation tube 81 unobstructed, and the middle of the outer wall of the heat dissipation tube 81 Several arc plates 82 are welded, and the arc plates 82 welded on the heat dissipation tube 81 can increase the contact area between the cold air and the heat dissipation tube 81, so that the cold air can more fully contact the heat dissipation tube 81 when entering through the bottom of the shell 1, effectively improving the heat transfer efficiency. In addition, by improving the heat dissipation efficiency, the temperature distribution inside the shell 1 is more uniform and stable, which helps to prevent thermal stress caused by excessive temperature gradient. Several arc plates 82 are arranged in a circumferentially symmetrical distribution, and the arc plates 82 are inclined. The bending direction of the arc plates 82 is arranged in the direction of the fixed block 89. The two ends of the heat dissipation tube 81 are rotatably connected with the moving block 14. After the smoke enters the heat dissipation tube 81 from the smoke inlet surface 2, it passes through the main gear 83 and the moving block After 14, the smoke is discharged from the smoke outlet surface 5. In the process of the smoke passing through the inside of the heat dissipation pipe 81, the heat energy in the smoke is transferred to the heat dissipation pipe 81, so that the temperature of the discharged smoke is reduced, which can reduce the thermal pollution to the surrounding environment and avoid adverse effects on the surrounding ecosystem. A fixed block 89 is arranged on one side of the heat dissipation pipe 81. The fixed block 89 is fixedly connected to the moving block 14. One end of the fixed block 89 is rotatably connected to a torsion spring 88. The torsion spring in the torsion spring 88 is fixedly connected to the fixed block 89. The main body of the torsion spring 88 is rotatably connected to the fixed block 89. A knocking rod 810 is fixedly connected to one side of the torsion spring 88. The torsion spring 88 and the knocking rod 810 are arranged obliquely. The knocking rod 810 is located at the top of the heat dissipation pipe 81.

[0041] like Figures 9 to 12The heat exchange optimization mechanism includes a plurality of synchronous wheels 12, a plurality of limit grooves 13 are formed through the inner side wall of the shell 1, and the plurality of limit grooves 13 are linearly and equally divided. The moving block 14 is slidably connected to the shell 1, and the moving block 14 is rotatably connected to a third connecting rod 18 on the same surface as the synchronous wheel 12. The center of the third connecting rod 18 is rotatably connected to the moving block 14, and the other side of the third connecting rod 18 is rotatably connected to a fourth connecting rod 19, one end of one of the fourth connecting rods 19 is rotatably connected to the first connecting rod 16, one of the third connecting rods 18 is rotatably connected to the second connecting rod 17, and the third connecting rod 18 and the fourth connecting rod 19 that are not connected to the second connecting rod 17 are rotatably connected in a cross manner. By adjusting the spacing of the heat dissipation pipes 81 in one direction, The heat transfer area can be flexibly adjusted according to actual needs to adapt to different working conditions, which can improve the heat exchange efficiency of the preheater and ensure that the best heat transfer performance can be obtained under different working conditions. In addition, the density of the heat dissipation pipe 81 can be increased at the position where a larger heat transfer area is required, thereby reducing the resistance of the flue gas in the tube bundle, reducing the pressure drop on the flue gas side, and improving the performance of the entire preheater. One end of the moving block 14 is located in the limiting groove 13, and the shell 1 limits the moving block 14. A connecting rod 15 is fixedly connected between the moving blocks 14. A through hole 20 is opened through the end surface connecting the moving block 14 and the shell 1. A shielding component 7 is arranged in the through hole 20. The shielding component 7 includes a plurality of connecting plates 71, and the connecting plate 71 slides with the shell 1. The through end of the heat dissipation pipe 81 is rotatably connected with the connecting plate 71, and a plurality of connecting plates 71 are fixedly connected with first accordion covers 72 between each other, one end of the first accordion covers 72 is fixedly connected to the shell 1, one end of one of the connecting plates 71 is fixedly connected to the second accordion cover 73, and the other end of the second accordion cover 73 is fixedly connected to the shell 1. The first accordion cover 72 and the second accordion cover 73 can effectively cover the space between the heat dissipation pipes 81. When the smoke enters from the smoke inlet surface 2, the smoke can be effectively blocked from entering the through hole 20 from the space between the heat dissipation pipes 81, thereby forming an air leakage channel. In this case, the smoke may bypass part of the heat dissipation pipe 81, resulting in a decrease in heat exchange efficiency and may cause Unexpected operation problems can be solved by using an accordion cover to cover the gap, which can reduce this type of smoke leakage and ensure the normal operation of the heat exchange system. In addition, the first accordion cover 72 and the second accordion cover 73 cover the space between the heat dissipation pipes 81, which can effectively guide the smoke and make it evenly distributed between the heat dissipation pipes 81, thereby improving the heat exchange efficiency. The first accordion cover 72 and the second accordion cover 73 are slidably connected to the shell 1. The first accordion cover 72 and the second accordion cover 73 are made of high-temperature resistant flexible material. Several synchronous wheels 12 are symmetrically arranged, and the synchronous wheels 12 are rotatably connected to the shell 1. The synchronous wheel 12 is fixedly connected to the second connecting rod 17 away from the shell 1, and the second connecting rod 17 is rotatably connected to the first connecting rod 16 on one side of the connection end of the synchronous wheel 12.The two first connecting rods 16 and the second connecting rod 17 are rotatably connected to one side of the moving block 14.

[0042] The working principle of this embodiment is as follows: the whole assembly of the shell 1 is connected and fixed to the tail flue of the boiler through the mounting member 6, and the flue gas inlet surface 2 faces the tail flue of the boiler, and the hot air outlet surface 4 is connected to the inside of the boiler. Then, when facing different working conditions, the staff can manually turn the handle 11 to drive the driven wheel 10 to follow the synchronous rotation. Under the action of the synchronous belt 21, the synchronous wheels 12 on both sides of the shell 1 rotate at the same time, prompting the second connecting rod 17 to follow the rotation. Because the second connecting rod 17 is rotatably connected to the third connecting rod 18, a plurality of third connecting rods 18 are rotatably connected to the fourth connecting rod 19, and one of the fourth connecting rods 1 9 is connected with the first connecting rod 16 in rotation. When the second connecting rod 17 rotates, the first connecting rod 16, the third connecting rod 18 and the fourth connecting rod 19 rotate simultaneously, so that the moving block 14 slides in the limiting groove 13 of the inner wall of the shell 1. At the same time, the first accordion cover 72 and the second accordion cover 73 located inside the through hole 20 are telescopically deformed, thereby achieving the purpose of changing the distance between the plurality of heat dissipation pipes 81. Then, the flue gas in the tail flue of the boiler enters the heat dissipation pipe 81 from the flue gas inlet surface 2, and then is discharged from the flue gas outlet surface 5. In the process of the flue gas passing through the heat dissipation pipe 81, the heat in the flue gas is left on the heat dissipation pipe 81.

[0043] When the boiler is working and needs air to promote combustion, the boiler draws cold air into the boiler from the cold air inlet surface 3 through the air suction machine. When the cold air passes through the heat pipe 81, the heat pipe 81 heats it, and the heated air enters the boiler to promote combustion. At the same time, under the action of the arc plate 82, the cold air pushes the heat pipe 81 to rotate in the direction of the fixed block 89, and the main gear 83 follows the synchronous rotation, so that the sub-gear 84 rotates in the opposite direction. Under the action of the connecting column 85, the ratchet 86 follows the sub-gear 84 and rotates in the same direction at the same time. When the ratchet 86 rotates, it repeatedly toggles the swing member 87. Under the action of the torsion spring member 88, the swing member 87 swings, so that the knocking rod 810 knocks the heat pipe 81, thereby vibrating the heat pipe 81 as a whole, so that the dust and accumulation on the inner wall surface of the heat pipe 81 fall off by themselves, and the subsequent flue gas continues to pass through the heat pipe 81, thereby blowing the dust and accumulation out of the heat pipe 81.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A heat exchange device in an air preheater, comprising a housing (1), characterized in that: The shell (1) has a hollow structure inside, and the top and bottom ends of the shell (1) are open. A heat dissipation component (8) is provided inside the shell (1). A heat exchange optimization mechanism is rotatably connected inside the shell (1), and the heat dissipation component (8) is rotatably connected to the heat exchange optimization mechanism. The heat dissipation assembly (8) comprises a heat dissipation pipe (81), a plurality of arc-shaped plates (82) are welded to the middle of the outer wall of the heat dissipation pipe (81), the plurality of arc-shaped plates (82) are arranged in a circumferentially symmetrical distribution, and the arc-shaped plates (82) are arranged in an inclined manner, both ends of the heat dissipation pipe (81) penetrate and are rotatably connected to a moving block (14), a fixed block (89) is arranged on one side of the heat dissipation pipe (81), the fixed block (89) is fixedly connected to the moving block (14), one end of the fixed block (89) is rotatably connected to a torsion spring member (88), one side of the torsion spring member (88) is fixedly connected to a knocking rod (810), and the knocking rod (810) is located at the top of the heat dissipation pipe (81); The heat exchange optimization mechanism comprises a plurality of synchronous wheels (12), the plurality of synchronous wheels (12) being symmetrically arranged, the synchronous wheels (12) being rotationally connected to the housing (1), the synchronous wheels (12) being fixedly connected to a second connecting rod (17) away from the housing (1), and the second connecting rod (17) being rotationally connected to a first connecting rod (16) at one side of an end connected to the synchronous wheel (12); A main gear (83) is fixedly connected to the connection between the heat dissipation pipe (81) and the moving block (14); the interior of the heat dissipation pipe (81) is connected to the main gear (83) and the interior of the moving block (14); one side of the main gear (83) is drivingly connected to a secondary gear (84); the secondary gear (84) is located at the bottom of the main gear (83); a connecting column (85) is fixedly connected to the side of the secondary gear (84) away from the moving block (14); and the other end of the connecting column (85) is fixedly connected to a ratchet (86); A swinging member (87) is disposed on the top of the ratchet (86), the swinging member (87) is engaged with the ratchet (86), one side of the swinging member (87) is fixedly connected to a torsion spring member (88), the swinging member (87) is located at the bottom of the center of the torsion spring member (88), and the knocking rod (810) is disposed in an inclined manner; The moving block (14) and the synchronous wheel (12) are rotatably connected to a third connecting rod (18) on the same surface; the center of the third connecting rod (18) is rotatably connected to the moving block (14); the other side of the third connecting rod (18) is rotatably connected to a fourth connecting rod (19); one end of one of the fourth connecting rods (19) is rotatably connected to the first connecting rod (16); one of the third connecting rods (18) is rotatably connected to the second connecting rod (17); and the third connecting rod (18) not connected to the second connecting rod (17) and the fourth connecting rod (19) are rotatably connected in a cross manner; A through hole (20) is formed through the end surface of the movable block (14) connected to the shell (1), and a shielding assembly (7) is arranged in the through hole (20). The shielding assembly (7) comprises a plurality of connecting plates (71), the connecting plates (71) are slidably connected to the shell (1), the through ends of the heat dissipation pipes (81) are rotatably connected to the connecting plates (71), and a first accordion cover (72) is fixedly connected between the plurality of connecting plates (71), one end of one of the first accordion covers (72) is fixedly connected to the shell (1), one end of one of the connecting plates (71) is fixedly connected to a second accordion cover (73), and the other end of the second accordion cover (73) is fixedly connected to the shell (1), the first accordion cover (72) and the second accordion cover (73) are slidably connected to the shell (1), and the first accordion cover (72) and the second accordion cover (73) are made of high temperature resistant flexible material.

2. The heat exchange device in an air preheater according to claim 1, characterized in that: The inner side wall of the shell (1) is provided with a plurality of limit grooves (13), the plurality of limit grooves (13) being linearly and equally spaced, the moving block (14) being slidably connected to the shell (1), one end of the moving block (14) being located in the limit groove (13), and the shell (1) limiting the moving block (14), and connecting rods (15) being fixedly connected between the plurality of moving blocks (14).

3. The heat exchange device in an air preheater according to claim 1, characterized in that: A plurality of mounting members (6) are fixedly connected to both sides of the outer wall of the shell (1), and the plurality of mounting members (6) are symmetrically arranged in pairs. One side of the shell (1) is arranged as a smoke inlet surface (2), and a side of the shell (1) away from the smoke inlet surface (2) is arranged as a smoke outlet surface (5). The top and bottom of the shell (1) are arranged as a hot air outlet surface (4) and a cold air inlet surface (3), respectively.

4. The heat exchange device in an air preheater according to claim 1, characterized in that: A fixing plate (9) is fixedly connected to the bottom of one side of the housing (1); an end of the fixing plate (9) away from the housing (1) is rotatably connected to a driven wheel (10); a plurality of the synchronous wheels (12) and the driven wheel (10) are transmission-connected via a synchronous belt (21); a plurality of the synchronous wheels (12) and the driven wheel (10) are arranged in a triangular structure; a handle (11) is rotatably connected to the side of the fixing plate (9) away from the driven wheel (10); and the through end of the handle (11) is fixedly connected to the driven wheel (10).

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