Flue gas waste heat utilization system

Abstract

The invention relates to the technical field of waste heat utilization, in particular to a flue gas waste heat utilization system. Comprising a tank body, the two ends of the tank body are fixedly connected with a first shell and a second shell respectively, and the first shell and the second shell are each provided with a liquid guide pipe; the first gas guide pipe is fixedly connected and communicated with the tank body; the second gas guide pipe is fixedly connected and communicated with the tank body; the two rotating shells are rotationally arranged in the first shell and the second shell in a sealed mode respectively, and a plurality of pipelines are fixedly connected and communicated between the two rotating shells; and the driving unit is arranged on the second shell, and the driving unit is used for controlling the rotating shell and the pipeline to rotate. The flue gas is guided to rotate in the tank body through pre-filtration of the filter unit on the first gas guide pipe and rotation of the pipeline, so that impurities in the flue gas are gathered near the inner wall of the tank body, the impurities attached to the pipeline are reduced, and the stability of the heat exchange efficiency is ensured.

Description

Technical Field

[0001] The 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 the existing thermal power units, exhaust heat loss accounts for 60% to 70% of the total heat loss of the boiler, which is the largest proportion of all heat losses. Therefore, it is particularly important to improve the thermal economy of the unit by reducing the boiler exhaust temperature and effectively utilizing the waste heat of the flue gas.

[0003] In order to improve energy efficiency and reduce carbon emissions, the flue gas waste heat utilization system has become one of the key equipment. Existing flue gas waste heat utilization systems often use heat exchangers to recycle the waste heat in the exhaust flue gas. Traditional heat exchangers recover the waste heat in the flue gas by gas-liquid heat exchange. However, since 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. 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, respectively, 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; a rotating shell, having two, 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, 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 of the gas and the 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, having multiple first rotating plates, each of which is fixedly connected to all the pipes; the first fixed shell is rotatably provided with multiple first rotating plates, the first rotating plates are located between two adjacent pipes, and the pipes limit the swing amplitude of the adjacent first rotating plates.

[0008] Furthermore, all of the pipelines are commonly fixed with 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 the second fixed shells and the plurality of the 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 jointly rotatably provided with a rotating frame, the pipeline limits the rotation range of the rotating frame, the rotating frame is provided with a plurality of through holes one, the first fixed shell is provided with a plurality of through holes two, the second fixed shell is provided with a plurality of through holes three, and the rotation of the rotating frame is used to change the connection state between the through holes two and the through holes three and the adjacent through holes one 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 through hole one.

[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 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 column and the adjacent second fixed shell, the rotating frame is provided with a plurality of blind holes, and the sliding column is 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 guides the smoke to rotate in the tank body through the pre-filtration of the filter unit on the first air duct, and then cooperates with the rotation of the rotating shell and the pipeline. Impurities in the smoke gather near the inner wall of the tank body under the action of rotating centrifugation, reducing the attachment of impurities to the pipeline, thereby ensuring the stability of heat exchange efficiency; through the staggered layout of the first fixed shell and the second fixed shell, the flowing smoke in the tank body is guided, and the retention time of the smoke in the tank body is prolonged, thereby improving the heat transfer efficiency; the detection unit detects the smoke temperature, controls the rotation angle of the rotating frame, and changes the flow path of the smoke in the tank body, so that the device can retain the smoke 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 smoke to flow to the middle of the tank body, so that the device can still maintain the smoke flow rate in the tank body under emergency conditions, reducing the occurrence of damage caused by pressure increase in the smoke 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; Figure 2 It is a cross-sectional view of the tank body and the first shell of the present invention; Figure 3 It is a cross-sectional view of the tank and the pipeline of the present invention; Figure 4 An exploded view of the first fixed shell and the second fixed shell of the present invention; Figure 5 It is a cross-sectional view of the second fixed shell and the rotating frame of the present invention.

[0017] The names and serial numbers of the parts in the figure are: 1. tank body, 2. first shell body, 3. second shell body, 4. first air duct, 5. second air duct, 6. rotating shell, 7. pipeline, 8. driving 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

[0018] 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.

[0019] 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 body 2 and a second shell body 3 fixedly connected at both ends of the tank body 1, and the first shell body 2 and the second shell body 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 a filter unit is provided on the first air guide tube 4; 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 body 2 and the second shell body 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 body 3, and the driving unit is used to control the rotating shell 6 and the pipe 7 to rotate.

[0020] 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 pipeline 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 waste heat of the flue gas. The filter unit is an existing structure, which is used to pre-filter impurities in the flue gas. The pipeline 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 whole 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 the flue gas pipeline, and the pipe opening on the lower side of the first air duct 4 is used to connect the impurity collection tank, and the pipe opening on the lower side of the first air duct 4 is connected to the filter unit thereon, and the impurity collection tank is used to collect impurities intercepted by the filter unit.

[0021] 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 a control terminal.

[0022] 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 makes the output power of the driving motor 8 different through the control terminal, which is used to change the rotation of the two rotating shells 6 and the pipeline 7 at different speeds.

[0023] The specific working principle is as follows: the smoke duct is installed with the first air duct 4, an impurity collection tank is installed at the lower pipe opening of the first air duct 4, and then the second air duct 5 is connected to the smoke exhaust pipeline, and a liquid circulation system is connected 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.

[0024] 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 the impurities in the flue gas, and then the flue gas enters the tank body 1 and flows downward, and then the flue gas is discharged from the second air duct 5. In 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.

[0025] During the above heat transfer process, the drive motor 8 works at the same time, 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, wherein the rotation of the pipe 7 stirs the flue gas flowing in the tank body 1, so that the flue gas forms a vortex in the tank body 1, and the flue gas in the rotating process is centrifuged, so that 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, and at the same time, the detection unit 10 detects the temperature of the flue gas entering the first air duct 4. As the temperature of the flue gas increases, the speed of the output shaft on the control drive motor 8 is controlled to increase accordingly, thereby 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.

[0026] 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.

[0027] 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 section and a truncated cone section, wherein the diameter of the truncated cone section of the first fixed shell 11 gradually increases from top to bottom, and there are six first rotating plates 12.

[0028] 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, 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, 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.

[0029] 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, and the cylindrical section of the first fixed shell 11 is located in the adjacent second fixed shell 13 .

[0030] Specific working principle: During the operation of the 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 acted upon by inertia, and the lower part of the first rotating plate 12 swings and fits the adjacent pipe 7, so that the pipe 7 is 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 action, 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 at this time, 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 realizing 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, and finally the flue gas is discharged from the second air guide pipe 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.

[0031] 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, 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 2 151, and the second fixed shell 13 is provided with a plurality of through holes 3 152. The rotation of the rotating frame 14 is used to change the connection state between the through holes 2 151 and the through holes 3 152 and the adjacent through holes 1 15 respectively; the through holes 2 151 on the first fixed shell 11 and the through holes 3 152 on the second fixed shell 13 are respectively opposite to the adjacent pipeline 7.

[0032] 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, the connecting rod on the rotating frame 14 is located between the two adjacent pipes 7, and the two sleeves of the rotating frame 14 are each provided with a through hole 15, 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, and 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.

[0033] 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 respectively fixedly connected to the two 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.

[0034] 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 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 larger. 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 there is a gap between the first elastic block 17 and the adjacent rotating frame 14.

[0035] Reference Figure 4 and Figure 5 As shown, 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, and 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.

[0036] In the above scheme, there are four sliding columns 19, and there are four groups of blind holes 20, each group of blind holes 20 has two blind holes 20, the blind holes 20 are hemispherical, 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.

[0037] Specific working principle: In the process of utilizing flue gas waste heat, 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. In 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, the second fixed shell 13 rotates clockwise due to 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 sliding column 19 drives 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 side. During the flow of smoke in the tank body 1, the smoke repeats the above clockwise rotation, wherein the impurities in the smoke are centrifugally driven to the vicinity of the inner wall of the tank body 1, and at the same time, part of the smoke 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 directly opposite to the adjacent through hole 15. The second rotating plate 16 is used to block impurities in the smoke from passing through the through hole 15, thereby further reducing the impurities in the smoke from adhering to the pipe 7, thereby ensuring the heat exchange efficiency of the device.

[0038] When the detection unit 10 detects that the temperature of the smoke entering the tank body 1 increases, the output power of the drive motor 8 is increased, so that the rotation speed of the second fixed shell 13 is accelerated. At this time, the relative shear force between the second fixed shell 13 and the rotating frame 14 becomes larger. When the 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, so that the through hole 2 151 and the through hole 3 152 are respectively staggered with the adjacent through hole 1 15 and are in a blocking rotation. In the subsequent flow of smoke in the tank body 1, the smoke only moves up a short distance in the annular channel between the first fixed shell 11 and the second fixed shell 13.

[0039] 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 (at this time, the filter unit in the first air duct 4 may be blocked), 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 make the first rotating plate 12 connected to it swing in the opposite direction, wherein the rotation of the first rotating plate 12 after the swing 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, so that 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 resume the connection state with the adjacent through hole 1 15. If the temperature is restored, 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. The inner side of the second rotating plate 16 will drive the smoke into the through hole 15. The second rotating plate 16 in this rotation process exhibits a gas suction effect, which accelerates the smoke to pass through the filter unit on the first air duct 4. Emergency treatment is performed within a period of time to keep the smoke flow speed in the tank body 1 relatively stable, reduce the occurrence of damage caused by pressure increase in the smoke 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 resumes normal operation and rotation, and the pipeline 7 resumes clockwise rotation.

[0040] It should be pointed out that the above preferred embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope 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 body (2) and a second shell body (3), and both the first shell body (2) and the second shell body (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), wherein a filter unit is 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 is arranged on the second shell (3), and is used to control the rotation of the rotating shell (6) and the pipeline (7).

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

3. The flue gas waste heat utilization system according to claim 1 is characterized in that: Also included are: The first fixed shell (11) has a plurality of first fixed shells (11) which are fixedly connected 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).

4. The flue gas waste heat utilization system according to claim 3 is characterized in that: All of the pipes (7) are commonly fixedly connected to 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 adjacent first fixed shells (11).

5. The flue gas waste heat utilization system according to claim 4 is characterized in that: There is a first gap between the first fixing shell (11) and the adjacent second fixing shell (13), there is a second gap between the first fixing shell (11) and the tank body (1), and the first gap is the same as the second gap.

6. The flue gas waste heat utilization system according to claim 4 is characterized in that: The second fixed shell (13) and the adjacent first fixed shell (11) are provided with a rotating frame (14) for rotating together, the pipeline (7) limits the rotation range of the rotating frame (14), the rotating frame (14) is provided with a plurality of through holes one (15), the first fixed shell (11) is provided with a plurality of through holes two (151), the second fixed shell (13) is provided with a plurality of through holes three (152), and the rotating frame (14) is rotated to change the connection state between the through holes two (151) and the through holes three (152) and the adjacent through holes one (15), respectively.

7. The flue gas waste heat utilization system according to claim 6 is 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).

8. The flue gas waste heat utilization system according to claim 6 is characterized in that: The rotating frame (14) is rotatably provided with a plurality of second rotating plates (16), wherein the second rotating plates (16) are directly opposite to the adjacent through hole one (15).

9. The flue gas waste heat utilization system according to claim 8, characterized in that: A first elastic block (17) and a second elastic block (18) are respectively fixedly connected to two sides of the second rotating plate (16); 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.

10. The flue gas waste heat utilization system according to claim 9, characterized in that: The second fixed shell (13) is slidably provided with a plurality of sliding columns (19), a spring being installed between the sliding columns (19) and the adjacent second fixed shell (13), the rotating frame (14) being provided with a plurality of blind holes (20), the sliding columns (19) being used to be inserted into corresponding blind holes (20), so that the second fixed shell (13) and the adjacent rotating frame (14) are in a state of relative static rotation.

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