Heat exchange device for flue gas waste heat recovery

Abstract

The embodiment of the invention discloses a heat exchange device for flue gas waste heat recovery, the heat exchange device comprises a shell, a flue gas filtering assembly, a flue gas inlet pipe and a tubular heat exchanger, the flue gas filtering assembly comprises a box body and a filtering part, the filtering part is arranged in the box body, and the tubular heat exchanger is arranged in the box body. The box body is arranged in the shell and is provided with an opening; the flue gas inlet pipe can be arranged in the shell in a penetrating manner and can extend into the box body so as to introduce flue gas into the box body, the filtering part is used for filtering the flue gas, and the filtered flue gas can be introduced into the shell through the opening; the tubular heat exchanger is arranged on the outer side of the shell and communicates with the shell so that smoke can be led into an inner cavity of the tubular heat exchanger from the interior of the shell to achieve heat exchange, and a smoke outlet pipe is arranged on the tubular heat exchanger. According to the whole system of the heat exchange device for flue gas waste heat recovery, efficient and stable recovery of flue gas waste heat is achieved, and meanwhile the flue gas filtering performance is ensured.

Description

Technical Field

[0001] This invention relates to the field of heat exchange device technology, and specifically to a heat exchange device for recovering waste heat from flue gas. Background Technology

[0002] The waste heat recovery heat exchange device for flue gas in power plants is the core equipment for the resource utilization of waste heat from the flue gas at the tail end of the boiler in thermal power generation systems. In the relevant technologies, in the traditional coal-fired, gas-fired or biomass power generation process, the flue gas temperature of the boiler is usually maintained in the range of 120-250℃. The direct emission of these high-temperature flue gases not only causes energy waste, but also aggravates environmental thermal pollution.

[0003] However, when the flue gas contains fly ash particles, ash will gradually accumulate in certain areas of the heat exchanger, such as the low-speed zone or dead corners. The heat transfer efficiency of these ash-accumulated areas decreases, resulting in a significant difference in metal wall temperature between the metal and non-ash-accumulated areas. The uneven local thermal expansion caused by this temperature difference will generate continuous tensile and compressive stress between adjacent metal structures. Under long-term action, this may lead to micro-cracks at the weld or sealing failure at the flange connection. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a heat exchange device for flue gas waste heat recovery. The entire system of the heat exchange device forms a closed-loop operation of filtration and heat exchange, realizing efficient and stable recovery of flue gas waste heat, while ensuring flue gas filtration performance and avoiding the problem of impurities in the flue gas gradually accumulating ash and scale in the tubular heat exchanger, which leads to a decrease in heat transfer efficiency and the generation of temperature differences.

[0006] The waste heat recovery heat exchange device for flue gas according to an embodiment of the present invention includes: a shell; a flue gas filter assembly, the flue gas filter assembly including a housing and a filter element, the filter element being disposed in the housing, the housing being disposed inside the shell and having an opening; a flue gas inlet pipe, the flue gas inlet pipe being able to pass through the shell and extend into the housing to allow flue gas to enter the housing, the filter element being used to filter the flue gas, the filtered flue gas being able to enter the shell through the opening; and a tubular heat exchanger, the tubular heat exchanger being disposed outside the shell and communicating with the shell, so that flue gas is allowed to enter the inner cavity of the tubular heat exchanger from inside the shell to achieve heat exchange, the tubular heat exchanger having a flue gas outlet pipe.

[0007] In the heat exchange device of this invention, when exchanging heat with flue gas, the high-temperature flue gas first enters the housing and filter components through the flue gas inlet pipe. The particulate matter is intercepted and purified by the filter components inside the housing. The purified flue gas then enters the tubular heat exchanger, where it undergoes sufficient heat exchange with the heat exchange tube bundle before being discharged through the flue gas outlet pipe.

[0008] Compared with related technologies, the heat exchange device for flue gas waste heat recovery in this embodiment of the invention forms a closed-loop operation of filtration and heat exchange, achieving efficient and stable recovery of flue gas waste heat. At the same time, it ensures the flue gas filtration performance and avoids the problem of impurities in the flue gas gradually accumulating ash and scale in the tubular heat exchanger, which leads to a decrease in heat transfer efficiency and the generation of temperature differences. This solves the technical problem that "when the flue gas contains fly ash particles, ash and scale will gradually accumulate in certain areas of the heat exchanger, such as the low-speed zone or dead corners. The heat transfer efficiency of these ash-accumulated areas decreases, resulting in a significant difference in metal wall temperature between the metal wall and the non-ash-accumulated areas. The uneven local thermal expansion caused by this temperature difference will generate continuous tensile and compressive stress between adjacent metal structures, which may lead to micro-cracks at the weld or sealing failure at the flange connection under long-term action."

[0009] In some embodiments, the flue gas filter assembly of the flue gas waste heat recovery heat exchange device of the present invention further includes a support partition, the support partition being disposed within the housing of the filter component, and the filter component being disposed on the support partition.

[0010] In some embodiments, the flue gas filter assembly of the flue gas waste heat recovery heat exchange device of the present invention further includes: a positioning platform, which is disposed in the housing and located on the upper side of the filter component; and a buckle, which passes through the positioning platform and is connected to the filter component.

[0011] In some embodiments, the heat exchange device for flue gas waste heat recovery of the present invention further includes a dust removal assembly for cleaning the outer periphery of the filter element. The dust removal assembly includes: a dust removal roller brush, wherein the dust removal roller is disposed in the housing and abuts against the filter element, and the dust removal roller brush is rotatable relative to the housing to clean the filter element; and a driving component, wherein the driving component is disposed at the bottom of the housing and connected to the dust removal roller brush to enable the dust removal roller to clean the filter element.

[0012] In some embodiments, the lower end face of the housing of the heat exchange device for flue gas waste heat recovery of the present invention is spaced apart from the inner bottom surface of the outer shell to form a dust collection chamber, the dust collection chamber being used to collect dust cleaned by the dust sweeping roller brush; and / or, the driving component includes: a driving motor, the driving motor being disposed at the bottom of the housing; a driving gear, the driving gear being disposed at the output end of the driving motor and rotating coaxially with it; a rotating rack, the rotating gear being disposed through the bottom of the housing and connected to the dust sweeping roller brush, the rotating rack being rotatable relative to the housing; and a driven gear, the driven gear being disposed at the bottom of the housing and rotatable relative to the housing, the driven gear, the rotating rack, and the driving gear being connected by a toothed transmission belt.

[0013] In some embodiments, the heat exchange device for flue gas waste heat recovery according to the present invention further includes a cleaning component, which is disposed on the tubular heat exchanger and communicates with the inner cavity of the tubular heat exchanger. The cleaning component is connected to the outer shell through a connecting pipe and is used to clean the inner cavity of the tubular heat exchanger.

[0014] In some embodiments, the ash removal component of the heat exchange device for flue gas waste heat recovery according to the present invention includes: a fan, the fan being disposed at one end of the tubular heat exchanger and communicating with the inner cavity of the tubular heat exchanger, and the fan being connected to the outer shell through the connecting pipe.

[0015] In some embodiments, the cleaning assembly of the heat exchange device for flue gas waste heat recovery according to the present invention further includes: a rapping component, the rapping component being disposed at one end of the tubular heat exchanger and communicating with the inner cavity of the tubular heat exchanger, the fan being disposed at the end of the rapping component away from the tubular heat exchanger and communicating with the fan; and a support ring sleeve, the support ring sleeve being sleeved on the outer periphery of the rapping component, the outer side of the support ring sleeve having a through hole.

[0016] In some embodiments, the rapping component of the heat exchange device for flue gas waste heat recovery according to the present invention includes: an inner filter sleeve disposed in the inner cavity of the support ring; a rotating impeller disposed in the inner cavity of the inner filter sleeve and rotatable relative to the inner filter sleeve, the rotating impeller having a vent; a vibrating element disposed on the rotating impeller to vibrate under the drive of the rotating impeller; a flow divider plate fixedly disposed on the vibrating element; and a filter grid fixedly disposed on the flow divider plate.

[0017] In some embodiments, the vibrating element of the heat exchange device for flue gas waste heat recovery according to the present invention includes: a tube body disposed on the rotating impeller, the tube body having a limiting groove; a spring installed in the inner cavity of the tube body; a fixing plate installed at the end of the spring; a limiting piece installed on the fixing plate; and a buffer connecting block disposed on the fixing plate and fixedly connected to the diverter plate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal structure of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention. Figure 4This is a schematic diagram of the drive motor of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the fan in the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the rotating impeller of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the spring structure of the heat exchange device for flue gas waste heat recovery according to an embodiment of the present invention. Figure label: 1. Outer shell; 2. Flue gas filter assembly; 201. Housing; 2011. Opening; 202. Filter component; 2021. Adsorption filter element; 203. Support partition; 204. Positioning platform; 205. Buckle; 3. Flue gas inlet pipe; 4. Tubular heat exchanger; 5. Flue gas outlet pipe; 6. Ash removal assembly; 601. Ash removal roller brush; 602. Drive component; 6021. Drive motor; 6022. Drive gear; 6023. Rotating rack; 6024. Driven gear; 6025. Gear 7. Grooved drive belt; 8. Ash collection chamber; 9. Ash cleaning assembly; 10. Connecting pipe; 11. Fan; 12. Vibrating component; 13. Inner filter sleeve; 14. Rotating impeller; 15. Ventilation outlet; 26. Vibrating component; 27. Pipe body; 28. Limiting channel; 39. Spring; 40. Fixing plate; 51. Limiting piece; 62. Buffer connecting block; 73. Diverter plate; 844. Filter screen; 85. Support ring sleeve; 86. Through hole; 77. Pipe. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] Reference Figures 1-7As shown, the heat exchange device for flue gas waste heat recovery in this embodiment of the invention includes a shell 1, a flue gas filter assembly 2, a flue gas inlet pipe 3, and a tubular heat exchanger 4. The flue gas filter assembly 2 includes a housing 201 and a filter element 202. The filter element 202 is disposed inside the housing 201, which is located inside the shell 1 and has an opening 2011. The flue gas inlet pipe 3 can pass through the shell 1 and extend into the housing 201 to allow flue gas to enter the housing 201. The filter element 202 is used to filter the flue gas, and the filtered flue gas can enter the shell 1 through the opening 2011. The tubular heat exchanger 4 is located outside the shell 1 and communicates with it, allowing flue gas to enter the inner cavity of the tubular heat exchanger 4 from inside the shell 1 for heat exchange. The tubular heat exchanger 4 has a flue gas outlet pipe 5. The tubular heat exchanger 4 includes a heat exchanger body and a heat exchange tube bundle. The heat exchanger body has a chamber, and the heat exchange tube bundle is located in the chamber. The purified flue gas enters the chamber and exchanges heat with the metal outer wall of the heat exchange tube bundle.

[0021] In the heat exchange device of this embodiment of the invention, when exchanging heat with flue gas, the high-temperature flue gas first enters the housing 201 and the filter component 202 through the flue gas inlet pipe 3. The particulate matter is intercepted and purified by the filter component in the housing 201. The purified flue gas enters the tubular heat exchanger 4, and after sufficient heat exchange with the heat exchange tube bundle in the tubular heat exchanger 4, it is discharged from the flue gas outlet pipe 5.

[0022] Compared with related technologies, the heat exchange device for flue gas waste heat recovery in this embodiment of the invention forms a closed-loop operation of filtration and heat exchange, achieving efficient and stable recovery of flue gas waste heat. At the same time, it ensures the flue gas filtration performance and avoids the problem of impurities in the flue gas gradually accumulating ash and scale in the tubular heat exchanger 4, which leads to a decrease in heat transfer efficiency and the generation of temperature differences. This solves the technical problem that "when the flue gas contains fly ash particles, ash and scale will gradually accumulate in certain areas of the heat exchanger, such as the low-speed zone or dead corners. The heat transfer efficiency of these ash-accumulated areas decreases, resulting in a significant difference in metal wall temperature between the metal wall and the non-ash-accumulated areas. The uneven local thermal expansion caused by this temperature difference will generate continuous tensile and compressive stress between adjacent metal structures, which may lead to micro-cracks at the weld or sealing failure at the flange connection under long-term action."

[0023] In some embodiments, such as Figure 2 and Figure 3 As shown, the flue gas filter assembly 2 of the flue gas waste heat recovery heat exchange device in this embodiment of the invention further includes a supporting partition 203. The supporting partition 203 is disposed within the housing 201, and the filter component 202 is disposed on the supporting partition 203. The supporting partition 203 and the housing 201 form a stable supporting frame, providing a reliable installation reference for the filter component 202.

[0024] Optionally, the filter element 202 is an adsorption filter element 2021, which is used to filter impurities in the flue gas.

[0025] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the flue gas filter assembly 2 of the flue gas waste heat recovery heat exchange device in this embodiment of the invention further includes a positioning platform 204 and a buckle 205. The positioning platform 204 is disposed inside the housing 201 and located on the upper side of the filter element 202. The buckle 205 passes through the positioning platform 204 and is connected to the filter element 202. The clamping mechanism formed by the positioning platform 204 and the buckle 205, through its guiding and positioning design, ensures the installation accuracy and reliability of the adsorption filter element 2021.

[0026] In some embodiments, such as Figure 3 and Figure 4 As shown, the heat exchange device for flue gas waste heat recovery in this embodiment of the invention further includes a dust removal assembly 6 for cleaning the outer periphery of the filter element 202. The dust removal assembly 6 includes a dust removal roller brush 601 and a drive component 602. The dust removal roller is disposed inside the housing 201 and abuts against the filter element 202. The dust removal roller brush 601 is rotatable relative to the housing 201 to clean the filter element 202. The drive component 602 is disposed at the bottom of the housing 201 and connected to the dust removal roller brush 601 to clean the filter element 202. This combination ensures the filtration efficiency of the filter element 202 and effectively prevents the surface scaling problem common in traditional filtration devices through mechanical cleaning, significantly extending the service life of the filter element.

[0027] Optionally, the outer circumferential surface of the dust-sweeping roller brush 601 maintains a tight contact with the outer filter surface of the adsorption filter element 2021, and the rotation axis of the dust-sweeping roller brush 601 is parallel to the central axis of the adsorption filter element 2021. The dust-sweeping roller brush 601 and the adsorption filter element 2021 form a dynamic sealed contact. The dust-sweeping roller brush 601 adopts a parallel arrangement with equal diameters to ensure that it applies a uniform force to the surface of the filter element during rotation. This design avoids damage to the filter media caused by local overload and ensures the continuity and thoroughness of the cleaning operation. The contact surface structure can adapt to the wear and deformation of the filter media and maintain a constant contact pressure.

[0028] In some embodiments, such as Figure 2 and Figure 3 As shown, in this embodiment of the invention, the lower end face of the heat exchange device for flue gas waste heat recovery is arranged at an interval between the inner bottom surface of the housing 1 and the outer shell 1 to form a dust collection chamber 7, which is used to collect the dust cleaned by the dust sweeping roller brush 601.

[0029] In some embodiments, such as Figure 2 and Figure 3As shown, the drive component 602 includes a drive motor 6021, a drive gear 6022, a rotating rack 6023, and a driven gear 6024. The drive motor 6021 is located at the bottom of the housing 201, and the drive gear 6022 is located at the output end of the drive motor 6021 and rotates coaxially with it. The rotating gear passes through the bottom of the housing 201 and is connected to the dust-sweeping roller brush. The rotating rack 6023 is rotatable relative to the housing 201. The driven gear 6024 is located at the bottom of the housing 201 and is rotatable relative to the housing 201. The driven gear 6024, the rotating rack 6023, and the drive gear 6022 are connected by a toothed transmission belt 6025.

[0030] When the drive unit 602 is started to drive the dust sweeping roller brush 601, the drive motor 6021 is started. The drive motor 6021 drives the drive gear 6022, the toothed transmission belt 6025, the driven gear 6024, and the rotating rack 6023 to rotate. Then the rotating rack 6023 drives the dust sweeping roller brush 601 to rotate.

[0031] The dust collection chamber 7 achieves efficient collection and storage of dust and dirt. The dust sweeping assembly 6 adopts a power transmission system design with a drive component 602. The bottom of the housing 201 serves as the basic support component, and its rigid structure ensures the stability of the system operation. The optimized cooperation between the toothed drive belt 6025 and the drive component 602 achieves smooth power conversion. The rigid connection design between the rotating rack 6023 and the dust sweeping roller brush 601 ensures the precise execution of the sweeping action. This transmission system features high transmission efficiency.

[0032] Optionally, the outer wall of the drive motor 6021 is fixedly connected to the housing 201 through a plate, and the output end of the drive motor 6021 is located at the top of the drive motor 6021 body. The drive motor 6021 is located at the corner of the drive component 602, so as not to delay the operation of the toothed transmission belt 6025.

[0033] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the heat exchange device for flue gas waste heat recovery in this embodiment of the invention further includes a cleaning component 8. The cleaning component 8 is disposed on the tubular heat exchanger 4 and communicates with the inner cavity of the tubular heat exchanger 4. The cleaning component 8 is connected to the outer shell 1 through a connecting pipe 81 and is used to clean the inner cavity of the tubular heat exchanger 4. By setting the cleaning component 8, flue gas enters the cleaning component 8 through the connecting pipe 81. The cleaning component 8 can clean the inner cavity of the tubular heat exchanger 4, providing another cleaning mechanism. Combined with the flue gas filtration method of the adsorption filter element 2021, two cleaning methods are realized, and the continuous operating efficiency of the tubular heat exchanger 4 is improved through composite cleaning.

[0034] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the cleaning assembly 8 of the flue gas waste heat recovery heat exchanger in this embodiment of the invention includes a fan 83. The fan 83 is located at one end of the tubular heat exchanger 4 and communicates with the inner cavity of the tubular heat exchanger 4. The fan 83 is connected to the outer casing 1 through a connecting pipe 81. The installation of the fan 83 ensures sufficient air pressure and air volume, enabling the flue gas entering the connecting pipe 81 to be forcefully drawn into the inner cavity of the tubular heat exchanger 4.

[0035] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the cleaning assembly 8 of the flue gas waste heat recovery heat exchanger in this embodiment of the invention further includes a rapping component 84 and a support ring 85. The rapping component 84 is located at one end of the tubular heat exchanger 4 and communicates with the inner cavity of the tubular heat exchanger 4. The fan 83 is located at the end of the rapping component 84 away from the tubular heat exchanger 4 and communicates with the fan 83. The support ring 85 is sleeved on the outer periphery of the rapping component 84 and located inside the heat exchange tube bundle. A through hole 851 is opened on the outer side of the support ring 85. The design of the rapping component 84 combines the dual advantages of airflow scavenging by the fan 83 and mechanical rapping. The support ring 85 not only provides structural support, but the special arrangement of its through hole 851 also optimizes the airflow distribution.

[0036] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the rapping component 84 of the flue gas waste heat recovery heat exchange device of this embodiment includes an inner filter sleeve 841, a rotating impeller 842, a vibrating element 845, a flow divider 846, and a filter grid 847. The inner filter sleeve 841 is disposed in the inner cavity of the supporting ring sleeve 85. The rotating impeller 842 is disposed in the inner cavity of the inner filter sleeve 841 and is rotatable relative to the inner filter sleeve 841, and has a vent 8421 on it. The vibrating element 845 is disposed on the rotating impeller 842 to vibrate under the drive of the rotating impeller 842. The flow divider 846 is fixedly disposed on the vibrating element 845. The filter grid 847 is fixedly disposed on the flow divider 846.

[0037] The inner filter sleeve 841 ensures the filtration effect, the blade shape of the rotating impeller 842 achieves efficient airflow guidance, the arrangement of the vent 8421 ensures the reasonable distribution of airflow, the innovative structure of the vibrating element 845 achieves stable vibration output, and the combined design of the flow divider 846 and the filter grid 847 optimizes the airflow distribution and filtration effect.

[0038] During use, the dust removal component 8 starts according to a preset cycle. The high-pressure airflow generated by the fan 83 is distributed to each heat exchange tube of the tubular heat exchanger 4 through the connecting pipe 81. The attached ash and scale are dislodged by the high-frequency mechanical vibration of the airflow and vibration generated by the rotating impeller 842 of the rapping component 84 driving the vibrating component 845. Finally, it is collected and discharged by the filter screen 847. This process does not require shutdown, which reduces maintenance costs and extends the service life of the equipment.

[0039] In summary, the dual-mode cleaning of the tubular heat exchanger 4 is achieved through the synergistic effect of the high-pressure airflow driven by the fan 83 and the mechanical vibration of the rapping component 84, which solves the problem of low efficiency of the traditional single cleaning method. Its modular design facilitates maintenance, and the cooperation between the through hole 851 and the flow divider plate 846 enables the device to maintain stable heat exchange efficiency during long-term operation.

[0040] In some embodiments, such as Figure 5 , Figure 6 and Figure 7 As shown, the vibrating component 845 of the flue gas waste heat recovery heat exchanger according to an embodiment of the present invention includes a tube body 8451, a spring 8452, a fixing plate 8453, a limiting plate 8454, and a buffer connecting block 8455. The tube body 8451 is disposed on the rotating impeller 842, and a limiting groove 84511 is formed on the tube body 8451. The spring 8452 is installed in the inner cavity of the tube body 8451. The fixing plate 8453 is installed at the end of the spring 8452. The limiting plate 8454 is installed on the fixing plate 8453. The buffer connecting block 8455 is disposed on the fixing plate 8453 and is fixedly connected to the diverter plate 846. The buffering and limiting design significantly improves the reliability and service life of the vibrating component 84.

[0041] Among them, the design of spring 8452 achieves a buffering effect, the fixing plate 8453 ensures the effective transmission of vibration force, and the cooperative design of limit plate 8454 and limit channel 84511 prevents overtravel. In use, the rotating impeller 842 drives the vibrating component 845 to rotate at a set speed. First, under the action of centrifugal force, it generates periodic compression and rebound motion. The vibration force is transmitted to the flow divider plate 846 through the fixed plate 8453. At the same time, the limiting plate 8454 slides axially along the limiting groove 84511 to ensure that the vibration energy is accurately applied to the heat exchange tube wall. The buffer connecting block 8455 absorbs the excess energy in the high-frequency vibration in real time, reducing the impact force transmitted to the flow divider plate 846. This enables continuous and efficient removal of dirt and scale from the surface of the heat exchange tube bundle.

[0042] In summary, the spring 8452 achieves optimal buffering of vibration energy, the matching design of the limiting plate 8454 and the limiting channel 84511 effectively controls the vibration amplitude and prevents overload damage, while the buffer connecting block 8455 made of special rubber material significantly reduces vibration transmission loss. This design effectively extends the service life of the rapping component 84, improves the dust removal efficiency, and reduces equipment operating noise, achieving a dual optimization of efficient dust removal and equipment protection.

[0043] In some embodiments, such as Figure 4 As shown, in this embodiment of the invention, the heat exchange device for flue gas waste heat recovery has multiple ash-sweeping roller brushes 601 and multiple rotating toothed rods 6023, with each multiple ash-sweeping roller brush 601 and multiple rotating toothed rods 6023 corresponding one-to-one. The multiple ash-sweeping roller brushes 601 enable more comprehensive cleaning of the adsorption filter element 2021.

[0044] In operation, high-temperature flue gas first enters the flue gas filter assembly 2 through the flue gas inlet pipe 3, and is purified by the adsorption filter element 2021 inside the housing 201. The ash-sweeping roller brush 601 continuously cleans the adsorption filter element 2021 under the drive of the ash-sweeping assembly 6. The collected ash falls into the ash collection chamber 7. The purified flue gas enters the tubular heat exchanger 4 through the pipe 86. After sufficient heat exchange with the heat exchange tube bundle in the tubular heat exchanger 4, it is discharged from the flue gas outlet pipe 5. At the same time, the ash-cleaning assembly 8 cleans the inner cavity of the tubular heat exchanger 4 through periodic vibration and airflow backflushing. The whole system forms a closed loop of filtration, heat exchange and cleaning to achieve efficient and stable recovery of flue gas waste heat.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A heat exchange device for flue gas waste heat recovery, characterized in that, The heat exchange device comprises: a shell (1); a flue gas filtering assembly (2) comprising a box (201) and a filtering part (202), the filtering part (202) being arranged in the box (201), the box (201) being arranged in the shell (1) and the box (201) being provided with an opening (2011); a flue gas inlet pipe (3) which can be arranged in the shell (1) and can extend into the box (201) to introduce flue gas into the box (201), the filtering part (202) being used for filtering flue gas, and the filtered flue gas being introduced into the shell (1) through the opening (2011); a tubular heat exchanger (4) which is arranged outside the shell (1) and communicates with the shell (1) so that flue gas is introduced into the inner cavity of the tubular heat exchanger (4) from the shell (1) to achieve heat exchange, and the tubular heat exchanger (4) is provided with a flue gas outlet pipe (5).

2. The heat exchanging device for flue gas waste heat recovery according to claim 1, characterized in that, The flue gas filtering assembly (2) further comprises: a support partition (203) arranged in the box (201), and the filtering part (202) is arranged on the support partition (203) (224).

3. The heat exchanging device for flue gas waste heat recovery according to claim 2, characterized in that, The flue gas filtering assembly (2) further comprises: a positioning table (204) arranged in the box (201) and located on the upper side of the filtering part (202); a buckle (205) arranged in the positioning table (204) and connected with the filtering part (202).

4. The heat exchanging device for flue gas waste heat recovery according to claim 1, characterized in that, The heat exchange device further comprises a dust cleaning assembly (6) for cleaning the periphery of the filtering part (202), and the dust cleaning assembly (6) comprises: a dust cleaning roller brush (601) arranged in the box (201) and abutting against the filtering part (202), the dust cleaning roller brush (601) being rotatable relative to the box (201) to clean the filtering part (202); a driving part (602) arranged at the bottom of the box (201) and connected with the dust cleaning roller brush (601) to make the dust cleaning roller clean the filtering part (202).

5. The heat exchanging device for flue gas waste heat recovery according to claim 4, characterized in that, The lower end surface of the box (201) and the inner bottom surface of the shell (1) are arranged at intervals to form a dust collecting chamber (7) for collecting dust cleaned by the dust cleaning roller brush (601); and / or, The driving part (602) comprises: a driving motor (6021) arranged at the bottom of the box (201); a driving gear (6022) arranged at the output end of the driving motor (6021) and coaxially rotatable therewith; a rotating gear rod (6023) arranged at the bottom of the box (201) and connected with the dust cleaning roller brush, the rotating gear rod (6023) being rotatable relative to the box (201). A driven gear (6024) is arranged at the bottom of the box (201) and rotatable relative to the box (201), and the driven gear (6024), the rotating gear rod (6023) and the driving gear (6022) are drivingly connected through a gear slot transmission belt (6025).

6. The heat exchanging device of flue gas waste heat recovery according to claim 1, characterized in that, Further comprising an ash cleaning assembly (8) arranged on the tubular heat exchanger (4) and communicating with the inner cavity of the tubular heat exchanger (4), the ash cleaning assembly (8) communicates with the shell (1) through a communication pipe (81) and is used for cleaning the inner cavity of the tubular heat exchanger (4).

7. The heat exchange device for flue gas waste heat recovery according to claim 6, characterized in that, The ash cleaning assembly (8) comprises: A fan (83) arranged at one end of the tubular heat exchanger (4) and communicating with the inner cavity of the tubular heat exchanger (4), the fan (83) communicates with the shell (1) through the communication pipe (81).

8. The heat exchange device for flue gas waste heat recovery according to claim 7, characterized in that, The ash cleaning assembly (8) further comprises: A rapping component (84) arranged at one end of the tubular heat exchanger (4) and communicating with the inner cavity of the tubular heat exchanger (4), the fan (83) is arranged at the end of the rapping component (84) away from the tubular heat exchanger (4) and communicates with the fan (83); A support ring (85) sleeved on the outer circumferential side of the rapping component (84), a through hole (851) is formed on the outer side of the support ring (85).

9. The heat exchange device for flue gas waste heat recovery according to claim 8, characterized in that, The rapping component (84) comprises: An inner layer filter sleeve (841) arranged in the inner cavity of the support ring (85); A rotating impeller (842) arranged in the inner cavity of the inner layer filter sleeve (841) and rotatable relative to the inner layer filter sleeve (841), the rotating impeller (842) has a ventilation port (8421) thereon; A vibrating element (845) arranged on the rotating impeller (842) to vibrate under the driving of the rotating impeller (842); A flow distribution plate (846) fixedly arranged on the vibrating element (845); A filter grille (847) fixedly arranged on the flow distribution plate (846).

10. The heat exchange device for flue gas waste heat recovery according to claim 9, characterized in that, The vibrating element (845) comprises: A tube body (8451) arranged on the rotating impeller (842), a limiting groove (84511) is formed on the tube body (8451); A spring (8452) mounted in the inner cavity of the tube body (8451); A fixed plate (8453) mounted on the end of the spring (8452); A limiting sheet (8454) mounted on the fixed plate (8453); A buffer connecting block (8455) arranged on the fixed plate (8453), the buffer connecting block (8455) is fixedly connected with the flow distribution plate (846).

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