A boiler waste heat recovery device

Abstract

The present invention discloses a boiler waste heat recovery device, which relates to the technical field of boiler waste heat recovery equipment. It includes a cylinder body. Inside the cylinder body, an ash discharge channel is arranged vertically. At the top of the ash discharge channel, a central pipe is arranged vertically. The central pipe extends upward out of the cylinder body. A dust discharge port is arranged at the bottom of the cylinder body. A waste heat recovery component and a filtered air duct component are fixed inside the central pipe. A backwashing component is fixed on the outer wall of the cylinder body. In the limited space of the cylinder body of the present invention, a waste heat recovery component and a filtered air duct component are added, realizing secondary filtration of the flue gas, enabling the filtered gas to meet the emission requirements. Moreover, after the flue gas passes through the primary filtration, there are fewer large particulate dusts, the deposition speed of dust particles on the flexible filter cylinder bag is slower, reducing the maintenance frequency of backwashing the flexible filter cylinder bag, increasing the service life of the flexible filter cylinder bag, and reducing the maintenance time of the boiler waste heat recovery device.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler waste heat recovery equipment, and in particular to a boiler waste heat recovery device. Background Art

[0002] A boiler waste heat recovery unit absorbs the heat from the boiler flue gas and displaces the heat from the flue gas through a heat transfer medium flowing through the heat exchange tubes, which is then reused. During heat exchange, particulate matter contained in the flue gas gradually adheres to the surface of the heat exchange tubes, increasing the thickness of the particulate matter. This affects heat exchange and reduces waste heat recovery efficiency.

[0003] In the prior art, an invention patent application filed on March 21, 2019, with application number CN201920365664.6, discloses an automatic cleaning flue gas waste heat recovery device. This device absorbs waste heat from flue gas and performs automatic cleaning. However, because the heat pipe is in direct contact with the flue gas, particulate impurities in the flue gas during discharge easily adhere and accumulate. Frequent activation of the cleaning device affects the heat transfer of the flue gas, reducing the heat transfer efficiency of the flue gas and causing the heat exchange efficiency of the waste heat recovery device to fail to meet the set requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a boiler waste heat recovery device to solve the problem in the above background technology that the heat pipe is in direct contact with the flue gas, particulate impurities are always attached to the surface of the heat pipe, and the heat transfer efficiency is unstable.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A boiler waste heat recovery device includes a cylinder, an ash discharge channel is vertically arranged in the cylinder, an air inlet pipe connected to the ash discharge channel is arranged on the side wall of the cylinder, a central pipe is vertically arranged on the top of the ash discharge channel, the central pipe extends upward out of the cylinder, an ash discharge port is arranged at the bottom of the cylinder, a waste heat recovery component and a filter air duct component are fixed in the central pipe, the waste heat recovery component includes a plurality of heat conducting pipes extending downward, the heat conducting pipes are connected by pipe connection, the filter air duct component includes an elastic component, a flexible component The filter cartridge bag and the sealing end block, the elastic component is fixed to the inner wall of the central tube, the sealing end block is fixed to the lower end of the elastic component, the flexible filter cartridge bag is sleeved on the outer wall of the elastic component, the upper end of the flexible filter cartridge bag is fixed to the top of the central tube, the lower end of the flexible filter cartridge bag is fixed on the sealing end block, the heat conduction tube is located in the flexible filter cartridge bag and passes downward through the sealing end block, the sealing end block can slide along the outer wall of the heat conduction tube, a recoil assembly is fixed on the outer wall of the cylinder, and the recoil assembly is used to provide recoil gas for the filter air duct assembly.

[0007] Preferably, a heat conducting member is further provided in the central tube, and the heat conducting member is fixed to the lower end of the heat conducting tube. The sealing end block descends along the heat conducting tube to a certain height, hits the heat conducting member to generate vibration, and transmits it to the flexible filter bag.

[0008] Preferably, the sealing end block moves along the heat conducting tube to generate twisting, causing the flexible filter cartridge bag to generate twisting and compression.

[0009] Preferably, the elastic component includes a plurality of elastic connecting rods, the upper ends of the elastic connecting rods are fixed to the inner wall of the central tube by a rotational connection, and the lower ends of the elastic connecting rods are fixed to the upper end of the sealing end block by a rotational connection.

[0010] Preferably, a flow guide portion is provided at the bottom of the heat conducting member.

[0011] Preferably, the guide portion has a conical structure.

[0012] Preferably, a shock-absorbing block is fixedly mounted on the upper end of the heat-conducting member.

[0013] Preferably, an opening is provided at the top of the cylinder, a detachable ring body is fixedly mounted at the opening, and the central tube is fixed on the ring body. Beneficial Effects

[0014] In the limited space of the cylinder body of the present invention, a waste heat recovery component and a filtering air duct component are added, realizing secondary filtration of the flue gas, enabling the filtered gas to meet the emission requirements. Moreover, after the first filtration, the flue gas contains less large-particle dust, the deposition speed of dust particles on the flexible filter cylinder bag is slower, reducing the maintenance frequency of backwashing the flexible filter cylinder bag, increasing the service life of the flexible filter cylinder bag, reducing the maintenance time of the boiler waste heat recovery device, ensuring the heat exchange efficiency of the boiler waste heat recovery device. At the same time, by utilizing the expansion force during backwashing, the sealing end block impacts the heat conducting member to generate vibration, which is transmitted to the flexible filter cylinder bag, accelerating the dust removal speed of the dust particles from the flexible filter cylinder bag, improving the dust removal efficiency of the flexible filter cylinder bag, reducing the maintenance frequency of backwashing the flexible filter cylinder bag, and further reducing the shutdown maintenance time of the boiler waste heat recovery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the backwashing component of Embodiment 1 of the present invention;

[0017] Figure 3 It is a schematic diagram of the connection relationship of Embodiment 1 of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the filtering air duct component of Embodiment 1 of the present invention;

[0019] Figure 5 It is a schematic diagram of the connection relationship of the elastic component of Embodiment 1 of the present invention;

[0020] Figure 6 It is a structural schematic diagram of the filtering air duct component of Embodiment 1 of the present invention in a natural state;

[0021] Figure 7 It is a structural schematic diagram of the filtering air duct component of Embodiment 2 of the present invention;

[0022] Figure 8 It is a structural schematic diagram of the heat conducting tube of Embodiment 2 of the present invention;

[0023] Figure 9 It is a schematic diagram of the installation structure of the ring body of Embodiment 2 of the present invention.

[0024] In the figure: 1, cylinder body; 101, ash discharge channel; 102, air inlet pipe; 103, central pipe; 1031, connecting flange; 104, ash discharge port; 105, ring body; 2, smoke delivery device; 3, waste heat recovery component; 301, heat conduction pipe; 303, heat conduction member; 3031, diversion part; 304, shock absorber block; 4, filter air duct component; 401, elastic component; 4011, elastic sheet; 4012, elastic connecting rod; 402, flexible filter cartridge bag; 403, sealing end block; 4031, sliding hole; 5, backwashing component; 501, spray head; 502, gas storage tank; 503, pulse solenoid valve; 7, upper fixing block; 8, lower fixing block. Embodiment

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0026] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art within the field to which the present disclosure pertains. The terms "including" or "comprising" and the like used in the present disclosure mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections and may also include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly. Embodiment 1

[0027] Refer to Figures 1 to 6As shown in the figure, a boiler waste heat recovery device includes a cylinder body 1. A dust discharge channel 101 is vertically arranged inside the cylinder body 1. An air inlet pipe 102 connected to the dust discharge channel 101 is arranged on the side wall of the cylinder body 1. The air inlet pipe 102 is externally connected to a smoke supply device 2. A central pipe 103 is vertically arranged at the top of the dust discharge channel 101. The central pipe 103 extends upward out of the cylinder body 1. A dust discharge port 104 is arranged at the bottom of the cylinder body 1. A connecting flange 1031 is arranged on the inner wall of the central pipe 103. A waste heat recovery component 3 and a filter air channel component 4 are fixed inside the connecting flange 1031. The waste heat recovery component 3 includes a number of downward-extending heat conduction pipes 301. The heat conduction pipes 301 are connected to each other through pipelines. The filter air channel component 4 includes an elastic component 401, a flexible filter cylinder bag 402, and a sealing end block 403. The elastic component 401 is fixed to the inner wall of the central pipe 103. The sealing end block 403 is fixed to the lower end of the elastic component 401. The flexible filter cylinder bag 402 is sleeved on the outer wall of the elastic component 401. The upper end of the flexible filter cylinder bag 402 is fixed to the top of the central pipe 103. The lower end of the flexible filter cylinder bag 402 is fixed to the sealing end block 403. The heat conduction pipes 301 are located inside the flexible filter cylinder bag 402 and penetrate downward through the sealing end block 403. A sliding hole 4031 matching the heat conduction pipe 301 is arranged on the sealing end block 403. The heat conduction pipe 301 is slidably inserted into the sliding hole 4031. The sealing end block 403 can slide along the outer wall of the heat conduction pipe 301. A backwashing component 5 is fixed on the outer wall of the cylinder body 1. The backwashing component 5 is used to provide backwashing gas for the filter air channel component 4.

[0028] Specifically, a smoke delivery device 2 can be externally connected to the intake pipe 102 for delivering boiler flue gas to the air inlet; the ash discharge channel 101 is cylindrical, and the blowing direction of the air flow in the intake pipe 102 is tangent to the outer circle of the ash discharge channel 101, so that the blown air flow can rotate around the inner wall of the cylinder body 1 to form a cyclone, making it easy for solid particles with greater inertia to be thrown towards the inner wall of the cylinder body 1, facilitating the peeling off of particulate dust; the central pipe 103 can be fixed to the cylinder body 1 by welding or detachable connection; the central pipe 103 is located at the central position of the ash discharge channel 101, separating the space at the central position to prevent the flue gas from directly flushing into the area of the ash discharge channel 101 and mixing with the air after primary filtration, facilitating the peeling off of particulate dust; the lower part of the ash discharge channel 101 is provided with an inverted frustum-shaped structure, and the peeled-off particulate dust accumulates in the lower part of the ash discharge channel 101 and is discharged from the ash discharge port 104, realizing the primary filtration of the primary flue gas; the end of the heat conduction pipe 301 extends out of the cylinder body 1, can be externally connected to a heat conduction medium device, and can provide a heat conduction medium to replace the heat in the flue gas; there is a gap between the inner wall of the flexible filter cartridge bag 402 and the central pipe 103, ensuring that there is sufficient contact area between the flue gas and the flexible filter cartridge bag 402, ensuring the filtering effect of the flue gas; the flexible filter cartridge bag 402 can perform secondary filtration on the flue gas, and the secondary filtration can capture smaller solid particles in the flue gas and retain them on the outer surface of the flexible filter cartridge bag 402; the elastic component 401 is used to support the flexible filter cartridge bag 402, prevent the flexible filter cartridge bag 402 from collapsing, and at the same time can deform, abutting against or disengaging from the inner wall of the flexible filter cartridge bag 402.

[0029] As Figure 5 shown in Figure 6 In some alternative embodiments, as shown, the central pipe 103 is a straight pipe, the elastic component 401 includes several elastic sheets 4011, a connecting flange 1031 is arranged in the central pipe 103, the upper end of the elastic sheet 4011 is fixed to the lower end surface of the connecting flange 1031, and the lower end of the elastic sheet 4011 is fixed to the upper end surface of the sealing end block 403. When the elastic component 401 is in the initial position, the elastic sheet 4011 deforms to the natural set height according to its own weight, generally in a curved shape, to support the flexible filter cartridge bag 402. When impacted by the reverse flow of air, the sealing end block 403 is pushed to move downward, and the elastic sheet 4011 deforms and straightens. When the impact of the reverse flow of air stops, the elastic sheet 4011 restores its shape through its own elastic force.

[0030] As Figure 2As shown, in some alternative embodiments, the recoil assembly 5 includes a spray head 501, a gas storage tank 502, and a pulse solenoid valve 503. The spray head 501 extends to the upper part of the central tube 103. The gas storage tank 502 is fixed to the outer wall of the cylinder body 1. The gas storage tank 502 includes an air inlet end and an air outlet end. The air inlet end is connected to an external gas source. The pulse solenoid valve 503 is installed on the air outlet end of the gas storage tank 502. The pulse solenoid valve 503 is connected to the spray head 501 through a pipeline. Gas enters the gas storage tank 502 through the air inlet end, is pressurized and stored, and has a certain pressure. When the pulse solenoid valve 503 operates, the gas is released in a short time to generate a huge impact force.

[0031] As Figure 6 shown, in some alternative embodiments, fixing rings are sewn at both the upper and lower ends of the flexible filter cartridge bag 402. The lower end of the connecting flange 1031 is installed with two semi-symmetrical upper fixing blocks 7 by means of bolt connection. An arc-shaped positioning groove matching the fixing ring is provided in the upper fixing block 7. The upper fixing block 7 clamps and fixes the fixing ring at the upper end of the flexible filter cartridge bag 402. The upper end of the sealing end block 403 is installed with two semi-symmetrical lower fixing blocks 8 by means of bolt connection. The lower fixing block 8 has the same structure as the upper fixing block 7 and is used to clamp and fix the fixing ring at the lower end of the flexible filter cartridge bag 402.

[0032] During filtration, the recoil gas enters the flexible filter cartridge bag 402, and the flexible filter cartridge bag 402 will expand and deform. The particulate dust on the outer surface of the flexible filter cartridge bag 402 is stripped from the outer surface of the flexible filter cartridge bag 402 by the impact of the recoil gas. At the same time, during the process of the recoil gas flushing in and stopping, the elastic component 401 and the flexible filter cartridge bag 402 both generate deformations due to the change in pressure difference. However, due to the different structures of the elastic component 401 and the flexible filter cartridge bag 402, the deformation processes of the two are not synchronous, resulting in a collision between the flexible filter cartridge bag 402 and the elastic component 401 during the deformation process. The particulate dust on the outer surface of the flexible filter cartridge bag 402 is accelerated and stripped from the surface of the flexible filter cartridge bag 402 by the inertia generated by the collision, improving the stripping efficiency and effect of the particulate dust particles on the surface of the flexible filter cartridge bag 402, reducing the maintenance time of the boiler waste heat recovery device, and saving the maintenance cost.

[0033] Generally speaking, in the limited space of the cylinder body 1 of the present invention, the waste heat recovery component 3 and the filter air duct component 4 are added, realizing the secondary filtration of the flue gas, making the filtered gas meet the emission requirements. And after the flue gas passes through the primary filtration, there are fewer large particulate dusts, and the deposition speed of the dust particles on the flexible filter cartridge bag 402 is slower. Therefore, less maintenance time is required, the maintenance frequency of the boiler waste heat recovery device is reduced, and the heat exchange efficiency of the boiler waste heat recovery device is ensured. Embodiment 2

[0034] See also Figures 7 to 9 As shown, a boiler waste heat recovery device is also provided in this embodiment. The specific structure of the buried boiler waste heat recovery device in this embodiment is roughly the same as the specific structure of the boiler waste heat recovery device in Example 1. The difference between the two is that the waste heat recovery component 3 in this embodiment has the following differences compared with the waste heat recovery component 3 in Example 1.

[0035] As an example, see Figure 7 As shown, in order to further reduce the maintenance time of the boiler waste heat recovery device, a heat conductor 303 is further provided in the central tube 103. The heat conductor 303 is fixed to the lower end of the heat conducting pipe 301. The sealing end block 403 descends along the heat conducting pipe 301 to a certain height, hits the heat conductor 303, generates vibration, and transmits it to the flexible filter cartridge bag 402.

[0036] Specifically, the heat conducting member 303 is made of heat-conducting metal material, the lower end of the heat conducting tube 301 is inserted into the heat conducting member 303 and fixed by bolts, and the lower ends of the heat conducting tubes 301 are connected to each other by pipeline connection. The heat conducting member 303 can transfer heat to the heat conducting tube 301, which can not only increase the heat exchange area, but also serve as a blocking structure when the sealing end block 403 is impacted, so that the sealing end block 403 vibrates during the impact, thereby accelerating the dust removal speed of dust particles from the flexible filter bag 402, improving the dust removal efficiency and service life of the flexible filter bag 402, reducing the number of maintenance times for backwashing of the flexible filter bag 402, and further reducing the downtime for maintenance of the boiler waste heat recovery device.

[0037] As an example, see Figure 8 As shown, in order to reduce the maintenance time of the flexible filter cartridge bag 402, the sealing end block 403 moves along the heat pipe 301 to generate twisting, so that the flexible filter cartridge bag 402 is twisted and compressed.

[0038] Specifically, the installation angle of the heat pipe 301 forms an included angle with the vertical direction, and the sealing end block 403 is provided with a sliding hole 4031 that matches the heat pipe 301. When the sealing end block 403 slides along the heat pipe 301, it will be twisted at the same time due to the limitation of the heat pipe 301. The bottom of the flexible filter cartridge bag 402 is twisted and moved synchronously, causing the flexible filter cartridge bag 402 to be twisted and compressed, accelerating the shaking off of dust particles, improving the dust removal efficiency and service life of the flexible filter cartridge bag 402, reducing the number of maintenance times for backwashing of the flexible filter cartridge bag 402, and further reducing the maintenance time of the boiler waste heat recovery device.

[0039] As an example, see Figure 8As shown, in an alternative embodiment, the elastic component 401 includes a plurality of elastic connecting rods 4012. The upper ends of the elastic connecting rods 4012 are fixed to the inner wall of the central tube 103 by means of rotational connection, and the lower ends of the elastic connecting rods 4012 are fixed to the upper end of the sealing end block 403 by means of rotational connection.

[0040] Specifically, the elastic connecting rod 4012 can be made by bending an elastic steel wire, and its end is cylindrical. Connecting seats are rotatably inserted at both ends of the elastic connecting rod 4012. One connecting seat is fixed to the inner wall of the central tube 103, and one connecting seat is fixed to the upper end of the sealing end block 403.

[0041] Please refer to Figure 8 As shown, in order to prevent the flue gas from damaging the flue gas flow direction when flowing through the heat conducting member 303, a flow guiding portion 3031 is provided at the bottom of the heat conducting member 303. After the primary filtered flue gas is guided by the conical heat conducting member 303, it flows into the gap between the flexible filter cartridge 402 and the central tube 103, enabling the flue gas to contact the side wall of the flexible filter cartridge 402 and ensuring the filtering efficiency of the flexible filter cartridge 402.

[0042] In some embodiments, the heat conducting member 303 can adopt various flow guiding structures, such as spiral, conical, etc. Among them, the heat conducting member 303 with a conical structure is preferably adopted. The conical heat conducting member 303 can quickly guide the flue gas into the gap between the flexible filter cartridge 402 and the central tube 103, ensuring the stability of flue gas transmission.

[0043] As Figure 8 As shown, in order to prevent the elastic component 401 from generating a large impact force when moving downward to the limit, a shock absorbing block 304 is fixedly installed at the upper end of the heat conducting member 303. In some embodiments, the shock absorbing block 304 can adopt materials such as heat resistant rubber, which can absorb a certain amount of impact force, reduce the impact force on the sealing end block 403, and prevent the impact force of the heat conducting member 303 from being too large and damaging the overall structure of the filter airway assembly 4 and the backwashing assembly 5.

[0044] As Figure 9 As shown, in order to further improve the maintenance efficiency of the waste heat recovery assembly 3, an opening is provided at the top of the cylinder body 1, and a ring body 105 is fixedly installed at the opening by means of bolt connection. The central tube 103 is fixed to the ring body 105 by means of bolt connection. During maintenance, the central tube 103 and the waste heat recovery assembly 3 can be lifted and maintained together, improving the maintenance efficiency of the boiler waste heat recovery device.

[0045] Working principle: The dusty boiler flue gas enters the ash discharge channel 101 through the intake pipe 102 and forms a rotating motion. Larger-mass particles in the flue gas have a certain weight themselves, and centrifugal force is generated during the rotation process. These particles are separated and trapped in the ash discharge channel 101, and then slowly fall to the ash discharge port 104 due to their own weight, achieving primary filtration of the flue gas. The flue gas passing through the primary filtration port moves upward again until it enters the central pipe 103. After secondary filtration by the filter airway assembly 4, the heat is recovered by the waste heat recovery assembly 3 and then discharged, realizing waste heat recovery and filtration of the flue gas.

[0046] Generally speaking, within the limited space of the cylinder body 1 of the present invention, the waste heat recovery assembly 3 and the filter airway assembly 4 are added, realizing secondary filtration of the flue gas, making the filtered gas meet the emission requirements. Moreover, after primary filtration, the flue gas contains fewer large-particle dusts, the deposition speed of dust particles on the flexible filter cylinder bag 402 is slower, reducing the maintenance frequency of backwashing the flexible filter cylinder bag 402, increasing the service life of the flexible filter cylinder bag 402, reducing the maintenance time of the boiler waste heat recovery device, ensuring the heat exchange efficiency of the boiler waste heat recovery device. At the same time, using the expansion force during backwashing, the sealing end block 403 impacts the heat conducting member 303 to generate vibration, which is transmitted to the flexible filter cylinder bag 402, accelerating the dust removal speed of the dust particles from the flexible filter cylinder bag 402, improving the dust removal efficiency and service life of the flexible filter cylinder bag 402, reducing the maintenance frequency of backwashing the flexible filter cylinder bag 402, and further reducing the downtime maintenance time of the boiler waste heat recovery device.

[0047] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A boiler waste heat recovery device, comprising a cylinder body (1), characterized in that: A dust discharge channel (101) is vertically arranged inside the cylinder body (1). An air inlet pipe (102) communicating with the dust discharge channel (101) is arranged on the side wall of the cylinder body (1). A central pipe (103) is vertically arranged at the top of the dust discharge channel (101). The central pipe (103) extends upward out of the cylinder body (1). A dust discharge port (104) is arranged at the bottom of the cylinder body (1). A waste heat recovery component (3) and a filtered air duct component (4) are fixed inside the central pipe (103). The waste heat recovery component (3) includes a plurality of heat conduction pipes (301) extending downward. The heat conduction pipes (301) are communicated with each other by means of pipeline connection. The filtered air duct component (4) includes an elastic component (401), a flexible filter cylinder bag (402) and a sealing end block (403). The elastic component (401) is fixed on the inner wall of the central pipe (103). The sealing end block (403) is fixed at the lower end of the elastic component (401). The flexible filter cylinder bag (402) is sleeved on the outer wall of the elastic component (401). The upper end of the flexible filter cylinder bag (402) is fixed at the top of the central pipe (103). The lower end of the flexible filter cylinder bag (402) is fixed on the sealing end block (403). The heat conduction pipe (301) is located inside the flexible filter cylinder bag (402) and penetrates downward through the sealing end block (403). The sealing end block (403) can slide along the outer wall of the heat conduction pipe (301). A backwashing component (5) is fixed on the outer wall of the cylinder body (1). The backwashing component (5) is used to provide backwashing gas for the filtered air duct component (4).

2. The boiler waste heat recovery device according to claim 1, characterized in that: A heat conduction member (303) is further arranged inside the central pipe (103). The heat conduction member (303) is fixed at the lower end of the heat conduction pipe (301).

3. The boiler waste heat recovery device according to claim 2, characterized in that: The sealing end block (403) moves along the heat conduction pipe (301) to generate torsion, so that the flexible filter cylinder bag (402) generates torsion and compression.

4. The boiler waste heat recovery device according to claim 3, characterized in that: The elastic component (401) includes a plurality of elastic connecting rods (4012). The upper ends of the elastic connecting rods (4012) are fixed on the inner wall of the central pipe (103) by means of rotational connection. The lower ends of the elastic connecting rods (4012) are fixed on the upper end of the sealing end block (403) by means of rotational connection.

5. The boiler waste heat recovery device according to claim 2, characterized in that: A flow guiding part (3031) is arranged at the bottom of the heat conduction member (303).

6. The boiler waste heat recovery device according to claim 5, wherein: The flow guiding part (3031) has a conical structure.

7. The boiler waste heat recovery device according to claim 6, characterized in that: A shock absorbing block (304) is fixedly installed at the upper end of the heat conduction member (303).

8. The boiler waste heat recovery device according to claim 1, characterized in that: An opening is arranged at the top of the cylinder body (1). A detachable ring body (105) is fixedly installed at the opening. The central pipe (103) is fixed on the ring body (105).

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