A flue gas waste heat utilization system

Abstract

The present invention relates to the technical field of waste heat utilization, and in particular to a flue gas waste heat utilization system. It comprises: a tank body, wherein the two ends of the tank body are respectively fixedly connected with a first shell and a second shell, and the first shell and the second shell are both provided with a liquid guide tube; a first air guide tube, fixedly connected and connected to the tank body; a second air guide tube, fixedly connected and connected to the tank body; a rotating shell, having two, respectively sealed and rotatably arranged in the first shell and the second shell, and a plurality of pipes are fixedly connected and connected between the two rotating shells; a driving unit, arranged on the second shell, and the driving unit is used to control the rotation of the rotating shell and the pipe. The present invention uses the pre-filtration of the filter unit on the first air guide tube, and then cooperates with the rotation of the pipe to guide the flue gas to rotate in the tank body, so that impurities in the flue gas gather near the inner wall of the tank body, reduce impurities attached to the pipe, and thus ensure the stability of the heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and in particular to a flue gas waste heat utilization system. Background Art

[0002] In existing thermal power plants, exhaust heat loss accounts for 60% to 70% of the total boiler heat loss, making it the largest heat loss component. Therefore, improving the thermal economy of the unit by reducing boiler exhaust temperature and effectively utilizing waste heat from the flue gas is crucial.

[0003] To improve energy efficiency and reduce carbon emissions, flue gas waste heat utilization systems have become one of the key equipment. Existing flue gas waste heat utilization systems often use heat exchangers to recover and utilize waste heat in exhaust flue gas. Traditional heat exchangers recover waste heat in flue gas through gas-liquid heat exchange. However, because the flue gas contains impurities such as unburned particulate matter, sulfide crystals, and sticky tar, these substances will form ash deposits on the walls of the heat exchange tubes. When the ash thickness reaches 0.5 mm, the overall heat transfer coefficient of the heat exchanger will drop by 30%-40%, resulting in a loss of more than 25% of the heat recovery capacity. This not only reduces the energy efficiency of the system, but also increases the environmental burden. Summary of the Invention

[0004] In order to overcome the problems raised in the above background technology, the present invention provides a flue gas waste heat utilization system.

[0005] The technical solution of the present invention is: a flue gas waste heat utilization system, comprising: a tank body, with a first shell and a second shell fixedly connected at both ends of the tank body, and the first shell and the second shell are both provided with a liquid duct; a first air duct, fixedly connected and connected to the tank body, and a filter unit is provided on the first air duct; a second air duct, fixedly connected and connected to the tank body, and the second air duct is located below the first air duct; two rotating shells, which are respectively sealed and rotatably arranged in the first shell and the second shell, and a plurality of pipes are fixedly connected and connected between the two rotating shells; a driving unit, which is arranged on the second shell, and the driving unit is used to control the rotation of the rotating shell and the pipe.

[0006] Furthermore, a detection unit is installed in the first air duct, and the detection unit is used to detect the temperature and flow rate of the gas. The detection unit is electrically connected to the driving unit through a control terminal.

[0007] Furthermore, it also includes: a first fixed shell, which has multiple first rotating plates and is fixed to all the pipes. The first fixed shell is rotatably provided with multiple first rotating plates, and the first rotating plates are located between two adjacent pipes. The pipes limit the swing amplitude of the adjacent first rotating plates.

[0008] Furthermore, all the pipes are fixedly connected to a plurality of second fixed shells, the number of the second fixed shells is the same as the number of the first fixed shells, and the plurality of second fixed shells and the plurality of first fixed shells are staggered, and an annular channel is formed between the second fixed shells and adjacent first fixed shells.

[0009] Furthermore, there is a first gap between the first fixing shell and the adjacent second fixing shell, there is a second gap between the first fixing shell and the tank body, and the first gap is the same as the second gap.

[0010] Furthermore, the second fixed shell and the adjacent first fixed shell are provided with a rotating frame for rotating together, the pipeline limits the rotation range of the rotating frame, the rotating frame is provided with multiple through holes 1, the first fixed shell is provided with multiple through holes 2, and the second fixed shell is provided with multiple through holes 3. The rotation of the rotating frame is used to change the communication status of the through holes 2 and the through holes 3 with the adjacent through holes 1 respectively.

[0011] Furthermore, the second through hole on the first fixed shell and the third through hole on the second fixed shell are respectively opposite to the adjacent pipes.

[0012] Furthermore, the rotating frame is rotatably provided with a plurality of second rotating plates, and the second rotating plates are directly opposite to the adjacent first through holes.

[0013] Furthermore, a first elastic block and a second elastic block are fixedly connected to both sides of the second rotating plate, respectively. The first elastic block and the second elastic block are both used to contact the adjacent rotating frames so that the second rotating plate is at different angles.

[0014] Furthermore, the second fixed shell is slidably provided with a plurality of sliding columns, a spring is installed between the sliding columns and the adjacent second fixed shell, the rotating frame is provided with a plurality of blind holes, the sliding columns are used to be inserted into the corresponding blind holes, so that the second fixed shell and the adjacent rotating frame are in relative static rotation.

[0015] The beneficial effects are as follows: the present invention pre-filters the filter unit on the first air duct, and then cooperates with the rotation of the rotating shell and the pipe to guide the flue gas to rotate in the tank body. Impurities in the flue gas gather near the inner wall of the tank body under the centrifugal action of rotation, reducing the adhesion of impurities to the pipe, thereby ensuring the stability of heat exchange efficiency; through the staggered layout of the first fixed shell and the second fixed shell, the flue gas flowing in the tank body is guided, the retention time of the flue gas in the tank body is prolonged, thereby improving the heat transfer efficiency; through the detection unit to detect the flue gas temperature, the rotation angle of the rotating frame is controlled, and the flow path of the flue gas in the tank body is changed, which makes it convenient for the device to retain flue gas at different temperatures to different degrees, further improving the heat transfer efficiency of the device; the rotating frame drives the second rotating plate to drive the flue gas to flow to the middle of the tank body, so that the device can still maintain the flue gas flow rate in the tank body under emergency conditions, reducing the occurrence of damage caused by pressure increase in the flue gas waste heat utilization system, that is, extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 It is a cross-sectional view of the tank body and the first shell of the present invention;

[0018] Figure 3 It is a cross-sectional view of the tank and pipeline of the present invention;

[0019] Figure 4 This is an exploded view of the first fixed shell and the second fixed shell of the present invention;

[0020] Figure 5 It is a cross-sectional view of the second fixed shell and the rotating frame of the present invention.

[0021] Names and serial numbers of parts in the figure: 1. Tank body, 2. First shell, 3. Second shell, 4. First air duct, 5. Second air duct, 6. Rotating shell, 7. Pipe, 8. Drive motor, 9. Gear set, 10. Detection unit, 11. First fixed shell, 12. First rotating plate, 13. Second fixed shell, 14. Rotating frame, 15. Through hole one, 151. Through hole two, 152. Through hole three, 16. Second rotating plate, 17. First elastic block, 18. Second elastic block, 19. Sliding column, 20. Blind hole. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0023] Example 1: A flue gas waste heat utilization system, referring to Figure 1-Figure 3As shown, it includes: a tank body 1, with a first shell 2 and a second shell 3 fixedly connected at both ends of the tank body 1, and the first shell 2 and the second shell 3 are both provided with a liquid guide tube; a first air guide tube 4, fixedly connected and connected to the tank body 1, and the first air guide tube 4 is provided with a filter unit; a second air guide tube 5, fixedly connected and connected to the tank body 1, and the second air guide tube 5 is located below the first air guide tube 4; a rotating shell 6, having two, which are respectively sealed and rotatably arranged in the first shell 2 and the second shell 3, and a plurality of pipes 7 are fixedly connected and connected between the two rotating shells 6; a driving unit, which is arranged on the second shell 3, and the driving unit is used to control the rotation of the rotating shell 6 and the pipe 7.

[0024] In the above scheme, the liquid conduit on the first shell 2 is the liquid inlet, the liquid conduit on the second shell 3 is the liquid discharge port, the first air conduit 4 is the air inlet, and the second air conduit 5 is the exhaust port, which is used to make the flow path of the gas in the tank body 1 opposite to the flow path of the liquid in the pipe 7. The first shell 2 is located below the second shell 3. The tank body 1, the first shell 2 and the second shell 3 are all made of heat-insulating materials to reduce the heat loss of the flue gas, thereby improving the utilization rate of the flue gas waste heat. The filter unit is an existing structure, which is used to pre-filter impurities in the flue gas. The pipe 7 has nineteen equally spaced units (this number is the number shown in the figure, and the actual number can be set accordingly according to needs). The flow path of the gas in the tank body 1 is opposite to the flow path of the liquid in the pipeline 7. Under this countercurrent layout, the high-temperature flue gas inlet and the low-temperature liquid inlet are respectively located at both ends of the heat exchanger, forming a high-gradient temperature difference in the entire process. This feature effectively alleviates the problem of decreased heat transfer rate caused by the reduction of temperature difference along the process in the downstream design, thereby significantly improving the heat transfer coefficient and heat recovery rate. The first air duct 4 is provided with two pipe openings. The pipe opening on the left side of the first air duct 4 is used to connect to the flue gas pipeline, and the pipe opening on the lower side of the first air duct 4 is used to connect to the impurity collection tank, and the pipe opening on the lower side of the first air duct 4 is connected to the filter unit above it. The impurity collection tank is used to collect impurities intercepted by the filter unit.

[0025] Reference Figure 1 and Figure 2 As shown, a detection unit 10 is installed in the first air duct 4. The detection unit 10 is used to detect the temperature and flow rate of the gas. The detection unit 10 is electrically connected to the driving unit through the control terminal.

[0026] In the above scheme, the driving unit includes a driving motor 8, which is fixed to the second shell 3. The output shaft of the driving motor 8 and the adjacent rotating shell 6 are transmitted through a gear set 9. The detection unit 10 is composed of a flow rate sensor and a temperature sensor. The detection unit 10 is located on the right side of the filter unit in the first air duct 4. The detection unit 10 controls the terminal to make the output power of the driving motor 8 different, so as to change the rotation speeds of the two rotating shells 6 and the pipeline 7.

[0027] The specific working principle is: install the flue gas pipe with the first air duct 4, install the impurity collection tank at the lower side pipe mouth of the first air duct 4, then connect the second air duct 5 to the smoke exhaust pipeline, and connect the liquid circulation system between the liquid duct of the first shell 2 and the liquid duct of the second shell 3, wherein the liquid circulation system is used to drive cold water from the liquid duct of the first shell 2 into the lower rotating shell 6, and then the liquid flows back into the liquid circulation system through all the pipes 7, the upper rotating shell 6 and the liquid duct of the second shell 3.

[0028] During the liquid circulation process, the flue gas exhausted from the thermal power unit passes through the first air duct 4, wherein the filter unit in the first air duct 4 pre-filters impurities in the flue gas. The flue gas then enters the tank body 1 and flows downward, and then the flue gas is discharged from the second air duct 5. During this process, the heat of the flue gas is transferred to the liquid therein through the pipeline 7, completing the recovery and utilization of the waste heat of the flue gas. The liquid after subsequent heat absorption is transported to other links for waste heat recovery and reuse.

[0029] During the above-mentioned heat transfer process, the drive motor 8 works simultaneously, and the output shaft of the drive motor 8 drives the two rotating shells 6 and all the pipes 7 to rotate slowly together through the gear set 9. The rotation of the pipe 7 stirs the flue gas flowing in the tank body 1, causing the flue gas to form a vortex in the tank body 1. Under the centrifugal action of the flue gas during the rotation, the impurities in the flue gas gather near the inner wall of the tank body 1, further reducing the impurities attached to the pipe 7, ensuring the heat exchange efficiency between the flue gas and the liquid. At the same time, the detection unit 10 detects the temperature of the flue gas entering the first air duct 4. As the flue gas temperature increases, the speed of the output shaft on the control drive motor 8 increases accordingly, increasing the relative speed between the flue gas and the heat exchange surface, which helps to break the boundary layer and increase the heat transfer coefficient, thereby improving the overall heat transfer efficiency. After the work is completed, the operator stops the flue gas transportation and stops the operation of the drive motor 8 to restore the device to its initial state.

[0030] Example 2: Based on Example 1, refer to Figure 2-Figure 4 As shown, it also includes: a first fixed shell 11, which has multiple parts and is fixed to all the pipes 7. The first fixed shell 11 is rotatably provided with multiple first rotating plates 12. The first rotating plates 12 are located between two adjacent pipes 7. The pipes 7 limit the swing amplitude of the adjacent first rotating plates 12.

[0031] In the above scheme, there are two first fixed shells 11, both of which are located between the first air duct 4 and the second air duct 5. The first fixed shell 11 is composed of a cylindrical segment and a frustum-shaped segment, wherein the diameter of the frustum-shaped segment of the first fixed shell 11 gradually increases from top to bottom, and there are six first rotating plates 12.

[0032] Reference Figure 2-Figure 4As shown, all the pipes 7 are commonly fixed with a plurality of second fixed shells 13, the number of the second fixed shells 13 is the same as the number of the first fixed shells 11, and the plurality of second fixed shells 13 and the plurality of first fixed shells 11 are staggered, and an annular channel is formed between the second fixed shells 13 and the adjacent first fixed shells 11, a first gap exists between the first fixed shell 11 and the adjacent second fixed shells 13, and a second gap exists between the first fixed shell 11 and the tank body 1, and the first gap is the same as the second gap.

[0033] In the above solution, there are two second fixed shells 13 . The upper side of the second fixed shell 13 is a frustum. The diameter of the frustum gradually increases from top to bottom. The cylindrical section of the first fixed shell 11 is located inside the adjacent second fixed shell 13 .

[0034] Specific working principle: During the operation of this device, the two rotating shells 6 and all the pipes 7 drive the two first fixed shells 11, the two second fixed shells 13 and all the first rotating plates 12 to rotate together. During the rotation process, the first rotating plate 12 is affected by inertia, and the lower part of the first rotating plate 12 swings and fits against the adjacent pipe 7, causing the pipe 7 to be in an inclined state. At this time, the inclined first rotating plate 12 rotates to drive the gas in the first fixed shell 11 to flow downward. Under its guiding effect, the flue gas entering the tank body 1 passes through the first gap into the annular channel between the first fixed shell 11 and the second fixed shell 13 and flows upward. Then the flue gas enters the middle part of the first fixed shell 11. During this process, the flue gas flows upward for a short distance, and the flow path of the flue gas is the same as the flow path of the liquid, extending the contact time between the two and achieving efficient heat and mass transfer in a limited space. At the same time, part of the flue gas flows downward through the second gap between the first fixed shell 11 and the tank body 1. Finally, the flue gas is discharged from the second air duct 5. The flue gas will repeat the above operation, so that the device can efficiently recover and reuse the waste heat of the flue gas.

[0035] Example 3: Based on Example 2, refer to Figure 2-Figure 4 As shown, the second fixed shell 13 and the adjacent first fixed shell 11 are rotated together to form a rotating frame 14, and the pipeline 7 limits the rotation range of the rotating frame 14. The rotating frame 14 is provided with a plurality of through holes 15, the first fixed shell 11 is provided with a plurality of through holes 151, and the second fixed shell 13 is provided with a plurality of through holes 152. The rotation of the rotating frame 14 is used to change the communication state between the through holes 151 and the through holes 152 and the adjacent through holes 1 15 respectively; the through holes 151 on the first fixed shell 11 and the through holes 152 on the second fixed shell 13 are respectively opposite to the adjacent pipeline 7.

[0036] In the above scheme, the rotating frame 14 is composed of two sleeves and multiple connecting rods, wherein the two sleeves are respectively sleeved on the cylindrical section of the adjacent first fixed shell 11 and the outer side of the adjacent second fixed shell 13, and the connecting rod on the rotating frame 14 is located between the two adjacent pipes 7. The two sleeves of the rotating frame 14 are both provided with a through hole 15, and the through hole 2 151 on the first fixed shell 11 and the through hole 3 152 on the second fixed shell 13 are respectively facing the adjacent pipes 7, and are used for the flue gas to directly blow the side wall of the pipe 7, wherein the direct impact can concentrate the heat of the high-temperature flue gas to be transferred to the liquid in the pipe 7. In the initial state, the through hole 2 151 and the through hole 3 152 are respectively connected to the adjacent through hole 1 15.

[0037] Reference Figure 2-Figure 4 As shown, the rotating frame 14 is rotatably provided with a plurality of second rotating plates 16, and the second rotating plates 16 are directly opposite to the adjacent through hole 15; the first elastic block 17 and the second elastic block 18 are fixedly connected to both sides of the second rotating plate 16, respectively, and the first elastic block 17 and the second elastic block 18 are used to contact the adjacent rotating frame 14 so that the second rotating plate 16 is at different angles.

[0038] In the above scheme, when the rotating frame 14 rotates clockwise (with the Figure 4 Taking the middle direction as an example), the second elastic block 18 contacts the side wall of the adjacent rotating frame 14. At this time, the angle between the side of the second rotating plate 16 on which the second elastic block 18 is installed and the adjacent rotating frame 14 is relatively small. The rotating frame 14 drives the second rotating plate 16 to rotate clockwise, so that the outer side surface of the second rotating plate 16 drives the smoke to rotate clockwise, and when the rotating frame 14 rotates counterclockwise (with the adjacent Figure 4 Taking the middle direction as an example), the first elastic block 17 contacts the side wall of the adjacent rotating frame 14. At this time, the angle between the side of the second rotating plate 16 on which the second elastic block 18 is installed and the adjacent rotating frame 14 is relatively large. The rotating frame 14 drives the second rotating plate 16 to rotate counterclockwise, so that the inner side surface of the second rotating plate 16 drives the smoke into the through hole 15. At this time, the second rotating plate 16 exhibits the effect of sucking gas. In the initial state, the second elastic block 18 contacts the adjacent rotating frame 14, and a gap exists between the first elastic block 17 and the adjacent rotating frame 14.

[0039] Reference Figure 4 and Figure 5 As shown, the second fixed shell 13 is slidably provided with a plurality of sliding posts 19, a spring is installed between the sliding posts 19 and the adjacent second fixed shell 13, and the rotating frame 14 is provided with a plurality of blind holes 20, and the sliding posts 19 are used to be inserted into the corresponding blind holes 20, so that the second fixed shell 13 and the adjacent rotating frame 14 are in relative static rotation.

[0040] In the above solution, there are four sliding columns 19 and four groups of blind holes 20, with each group of blind holes 20 having two blind holes. The blind holes 20 are hemispherical, and the outer sides of the four sliding columns 19 are all hemispherical, and the springs connected to the sliding columns 19 are in a compressed state.

[0041] Specific working principle: In the process of utilizing waste heat from flue gas, in the initial state, the driving motor 8 works to drive the two rotating shells 6 and all the pipes 7 to rotate clockwise together. During this process, all the pipes 7 drive the first fixed shell 11 and the second fixed shell 13 to rotate clockwise together. At this time, under the elastic potential energy of the spring connected to the sliding column 19, and the sliding column 19 is located in the adjacent blind hole 20, the second fixed shell 13 rotates clockwise through the sliding column 19 to drive the rotating frame 14 to rotate clockwise together, and the rotating frame 14 drives all the second rotating plates 16 to rotate clockwise. The second rotating plate 16 rotates clockwise to drive the gas to rotate on its outer surface. During the flow of flue gas in the tank body 1, the flue gas repeats the above-mentioned clockwise rotation, wherein the impurities in the flue gas are centrifugally driven to the vicinity of the inner wall of the tank body 1. At the same time, part of the flue gas flows through the through hole 15, the through hole 2 151 and the through hole 3 152. During this process, the second rotating plate 16 is opposite to the adjacent through hole 15. The second rotating plate 16 is used to block impurities in the flue gas from passing through the through hole 15, thereby further reducing the impurities in the flue gas from adhering to the pipe 7, thereby ensuring the heat exchange efficiency of the device.

[0042] When the detection unit 10 detects that the temperature of the flue gas entering the tank body 1 has increased, the output power of the drive motor 8 is increased, causing the rotation speed of the second fixed shell 13 to accelerate. At this time, the relative shear force between the second fixed shell 13 and the rotating frame 14 becomes greater. When this force is greater than the limiting force generated by the four sliding columns 19, the second fixed shell 13 and the rotating frame 14 rotate relative to each other, causing the second through hole 151 and the third through hole 152 to intersect with the adjacent through hole 1 15 respectively and to rotate in a blocked manner. During the subsequent flow of the flue gas in the tank body 1, the flue gas only moves upward for a short distance in the annular channel between the first fixed shell 11 and the second fixed shell 13.

[0043] When the detection unit 10 detects that the temperature of the smoke entering the tank body 1 returns to normal or the detection unit 10 detects that the flow rate of the smoke entering the tank body 1 slows down (this may be due to the blockage of the filter unit in the first air duct 4), the detection unit 10 controls the output shaft of the rotation control drive motor 8 to rotate in the opposite direction. At this time, the rotating shell 6, the pipeline 7, the first fixed shell 11, the second fixed shell 13 and the rotating frame 14 rotate counterclockwise, wherein the first fixed shell 11 rotates counterclockwise to cause the first rotating plate 12 connected thereto to swing in the opposite direction. After the swing, the rotation of the first rotating plate 12 is still used to drive the gas to flow downward, and during the counterclockwise rotation of the rotating frame 14, the second rotating plate 16 is blocked by the air, and the second rotating plate 16 rotates so that the first elastic block 17 on the second rotating plate 16 contacts the side wall of the adjacent rotating frame 14. At this time, the inner side of the second rotating plate 16 drives the smoke, and at the same time, it is blocked by the air, and the relative shear force between the rotating frame 14 and the second fixed shell 13 becomes larger, which makes The rotating frame 14 rotates in the opposite direction relative to the second fixed shell 13 to reset, and the through hole 2 151 and the through hole 3 152 will restore the connection state with the adjacent through hole 1 15. If the temperature recovers, the output shaft of the subsequent drive motor 8 will resume clockwise rotation. If the filter unit in the first air duct 4 is blocked, the output shaft of the drive motor 8 will keep rotating counterclockwise, and all the second rotating plates 16 will keep rotating counterclockwise, and the inner side surface of the second rotating plate 16 will drive the flue gas into the through hole 1 15. During this rotation process, the second rotating plate 16 exhibits a gas suction effect, accelerating the flue gas to pass through the filter unit on the first air duct 4. Emergency treatment is performed within a period of time to keep the flue gas flow speed in the tank body 1 relatively stable, reducing the occurrence of damage caused by pressure increase in the flue gas waste heat utilization system, thereby extending the service life of the device. The subsequent operator will promptly repair the filter unit on the first air duct 4. After the repair is completed, the device will resume normal rotation, and the pipe 7 will resume clockwise rotation.

[0044] It should be noted that the above preferred embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and essence of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A flue gas waste heat utilization system, Its characteristics include: A tank body (1), wherein two ends of the tank body (1) are respectively fixedly connected to a first shell (2) and a second shell (3), and both the first shell (2) and the second shell (3) are provided with a liquid guide tube; a first air guide pipe (4) fixedly connected to and in communication with the tank body (1); a filter unit being provided on the first air guide pipe (4); a second air guide pipe (5) fixedly connected to and in communication with the tank body (1), the second air guide pipe (5) being located below the first air guide pipe (4); There are two rotating shells (6), which are respectively arranged in a sealed and rotatable manner in the first shell (2) and the second shell (3), and a plurality of pipes (7) are fixedly connected and communicated between the two rotating shells (6); a driving unit, arranged on the second shell (3), the driving unit being used to control the rotation of the rotating shell (6) and the pipe (7); Also included are: The first fixed shell (11) has a plurality of first fixed shells (11) which are fixed to all the pipes (7). The first fixed shell (11) is rotatably provided with a plurality of first rotating plates (12). The first rotating plates (12) are located between two adjacent pipes (7). The pipes (7) limit the swing amplitude of the adjacent first rotating plates (12). All of the pipes (7) are commonly fixed with a plurality of second fixed shells (13), the number of the second fixed shells (13) is the same as the number of the first fixed shells (11), and the plurality of the second fixed shells (13) and the plurality of the first fixed shells (11) are staggered, and an annular channel is formed between the second fixed shells (13) and the adjacent first fixed shells (11); The second fixed shell (13) and the adjacent first fixed shell (11) are rotated together to form a rotating frame (14), the pipe (7) limits the rotation range of the rotating frame (14), the rotating frame (14) is provided with a plurality of through holes (15), the first fixed shell (11) is provided with a plurality of through holes (151), and the second fixed shell (13) is provided with a plurality of through holes (152). The rotating frame (14) is rotated to change the communication state between the through holes (151) and the through holes (152) and the adjacent through holes (15). The rotating frame (14) is rotatably provided with a plurality of second rotating plates (16), and the second rotating plates (16) are directly opposite to the adjacent through hole 1 (15); A first elastic block (17) and a second elastic block (18) are fixedly connected to both sides of the second rotating plate (16), and the first elastic block (17) and the second elastic block (18) are both used to contact the adjacent rotating frame (14), so that the second rotating plate (16) is at different angles.

2. The flue gas waste heat utilization system according to claim 1, characterized in that: A detection unit (10) is installed in the first air guide tube (4), and the detection unit (10) is used to detect the temperature and flow rate of the gas. The detection unit (10) is electrically connected to the drive unit via a control terminal.

3. The flue gas waste heat utilization system according to claim 2, characterized in that: There is a first gap between the first fixed shell (11) and the adjacent second fixed shell (13), there is a second gap between the first fixed shell (11) and the tank body (1), and the first gap is the same as the second gap.

4. The flue gas waste heat utilization system according to claim 3, characterized in that: The second through hole (151) on the first fixed shell (11) and the third through hole (152) on the second fixed shell (13) are respectively opposite to the adjacent pipes (7).

5. The flue gas waste heat utilization system according to claim 4, characterized in that: The second fixed shell (13) is slidably provided with a plurality of sliding columns (19), a spring is installed between the sliding columns (19) and the adjacent second fixed shell (13), the rotating frame (14) is provided with a plurality of blind holes (20), the sliding columns (19) are used to be inserted into the corresponding blind holes (20), so that the second fixed shell (13) and the adjacent rotating frame (14) are in relative static rotation.

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