Boiler tail flue structure and construction method thereof

Abstract

The invention belongs to the technical field of boiler flues, and discloses a boiler tail flue structure and a construction method thereof.The boiler tail flue structure comprises annular linings and a flue body, the annular linings cover the surface of the inner wall of the flue body, and the annular linings are sequentially spliced in the axial direction of the flue body; the annular lining comprises a plurality of arc-shaped anti-abrasion lining plates, and the multiple anti-abrasion lining plates are sequentially spliced to form an annular structure; wherein a dovetail column is arranged on the back face of the anti-abrasion lining plate, a dovetail groove is formed in the surface of the inner wall of the flue body, and the dovetail column is arranged in the dovetail groove in a matched mode. According to the anti-abrasion flue, the multiple anti-abrasion lining plates are sequentially spliced to form the annular structure, and the annular lining covers the surface of the inner wall of the flue body, so that the anti-abrasion performance of the flue body is effectively improved, long-term scouring and abrasion of solid particles in flue gas are resisted, and the service life of the flue body is greatly prolonged.

Description

Technical Field

[0001] This invention belongs to the field of boiler flue technology, and specifically relates to a boiler tail flue structure and its construction method. Background Technology

[0002] In actual boiler operation, high-speed flue gas continuously flows through its tail flue, which contains a large number of solid particles with high hardness and high kinetic energy. Under the high-speed entrainment of the flue gas, these solid particles violently scour the inner wall of the flue at extremely high speeds. Over time, this leads to severe wear on the inner wall of the flue, which in turn affects the normal operation and service life of the boiler. However, traditional flue wear prevention measures, such as using simple metal patches for protection, have problems such as poor protective effect, easy detachment, and short service life, which cannot meet the requirements of long-term stable operation of modern boilers. Summary of the Invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a boiler tail flue structure and its construction method to solve the technical problems of poor protective effect, easy detachment and short service life of traditional flue anti-wear measures.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention provides a boiler tail flue structure, including a circular inner liner and a flue body, wherein the circular inner liner covers the inner wall surface of the flue body and is sequentially spliced ​​along the axial direction of the flue body. The annular liner includes several arc-shaped wear-resistant liner plates, which are sequentially spliced ​​together to form an annular structure. The wear-resistant liner has a dovetail column on its back and a dovetail groove on the inner wall surface of the flue body. The dovetail column is fitted into the dovetail groove.

[0005] Furthermore, one end of the wear-resistant liner is provided with a front groove, and the other end of the wear-resistant liner is provided with a rear groove; when two adjacent wear-resistant liners are spliced, the front groove of one wear-resistant liner is connected to the rear groove of the other wear-resistant liner, and is fixedly connected to the inner wall of the flue body by a preset fastener.

[0006] Furthermore, both the front groove and the rear groove of the liner are provided with a number of fixing holes, and the preset fixing members are fixed in the inner wall of the flue body after passing through the fixing holes on the rear groove and the front groove of the liner in sequence.

[0007] Furthermore, a plurality of the fixing holes are spaced apart along the axial direction of the front groove of the liner or the rear groove of the liner, and are staggered on both sides of the central axis of the front groove of the liner or the rear groove of the liner.

[0008] Furthermore, the wear-resistant liner includes a front plate and a rear plate, both of which are arc-shaped plate structures; the back of the front plate is in contact with the front of the rear plate, and the back of the rear plate is in contact with the inner wall surface of the flue body. Wherein, the first end of the front plate extends to the outer side of the first end of the rear plate to form the liner front groove on the back side of the first end extension of the front plate; the second end of the rear plate extends to the outer side of the second end of the front plate to form the liner rear groove on the back side of the second end extension of the rear plate.

[0009] Furthermore, both the front panel and the rear panel include a hollow panel, a heat insulation layer, and a wear-resistant coating; wherein the heat insulation layer fills the interior of the hollow panel, and the wear-resistant coating is applied to the outer surface of the hollow panel.

[0010] Furthermore, the heat insulation layer is made of ceramic fiber cotton or aluminum silicate fiber felt, and the wear-resistant coating is a tungsten carbide coating or an aluminum oxide coating.

[0011] Furthermore, a buffer layer is provided between the front panel and the rear panel; wherein the buffer layer is a rubber pad or a silicone pad.

[0012] Furthermore, a radial expansion gap is reserved between the dovetail groove and the dovetail column.

[0013] The present invention also provides a construction method for a boiler tail flue structure, comprising: First, the flue body is manufactured according to the design requirements; then, several wear-resistant liners are sequentially spliced ​​to form a circular inner liner, and the circular inner liner is placed over the inner wall surface of the flue body; wherein, the dovetail columns on the wear-resistant liners are connected to the dovetail grooves on the inner wall of the flue body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The boiler tail flue structure provided by this invention utilizes several wear-resistant liners sequentially spliced ​​to form a circular structure, with the inner ring liner covering the inner wall surface of the flue body. This effectively improves the wear resistance of the flue body, resisting long-term erosion and wear from solid particles in the flue gas, and significantly extending the service life of the flue body. Specifically, the dovetail columns on the wear-resistant liner are connected to the dovetail grooves on the inner wall surface of the flue body, effectively ensuring a reliable connection between the circular liner and the flue body to withstand significant impact and vibration. Simultaneously, the dovetail column and dovetail groove connection enables rapid positioning of the wear-resistant liner on the inner wall of the flue body, greatly improving installation efficiency. Furthermore, the dovetail column and dovetail groove connection structure has excellent shear resistance, preventing horizontal displacement of the wear-resistant liner and ensuring installation stability.

[0015] Furthermore, when two adjacent wear-resistant liners are spliced, the front groove of one wear-resistant liner is connected to the rear groove of the other wear-resistant liner, and fixedly connected to the inner wall of the flue body through a pre-set fastener. This makes the wear-resistant liner firmly connected to the inner wall of the flue body, and significantly improves the integrity and structural strength of the annular liner, enabling it to better withstand the impact of particles in the flue gas.

[0016] Furthermore, the fixing holes are staggered on both sides of the central axis of the front groove or the rear groove of the liner, so that the pre-installed fasteners installed through the fixing holes can apply restraining forces in multiple directions to the wear-resistant liner, thereby making the connection between the wear-resistant liner and the inner wall of the flue body more secure. When subjected to the impact of flue gas particles, the staggered fixing holes combined with the pre-installed fasteners can better disperse stress, improve the impact resistance of the wear-resistant liner, and reduce loosening or damage caused by excessive local stress.

[0017] Furthermore, by setting a heat insulation layer inside the front and rear plates, heat in the boiler tail flue can be effectively prevented from being transferred outward, reducing the temperature of the outer wall of the flue body. This not only helps to improve the boiler's thermal efficiency and reduce energy waste, but also improves the working environment around the boiler and reduces the impact of high temperatures on equipment and personnel. Secondly, coating the surfaces of the front and rear plates with a wear-resistant coating can effectively resist the scouring and abrasion of solid particles in the flue gas, significantly extending the service life of the lining plates.

[0018] Furthermore, by setting a buffer layer between the front and rear plates, the buffer layer plays a role in buffering and shock absorption, thereby absorbing and dispersing some of the vibration energy and reducing the impact of vibration on the wear-resistant lining plate and the inner wall of the flue body.

[0019] Furthermore, by reserving a radial expansion gap between the dovetail groove and the dovetail column, space is provided for the thermal expansion of the wear-resistant liner and the flue body, avoiding excessive stress caused by mutual compression due to thermal expansion, thereby preventing deformation or damage to the wear-resistant liner and ensuring that the wear-resistant liner can work normally under different working conditions.

[0020] The construction method for the boiler tail flue structure provided by this invention possesses all the advantages of the aforementioned boiler tail flue structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1A cross-sectional view of the boiler tail flue structure provided in the embodiment; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic front view of the wear-resistant liner in the embodiment; Figure 4 This is a schematic diagram of the overall back side of the wear-resistant liner in the embodiment.

[0023] The components include: 1. anti-wear liner; 2. flue body; 3. fixing hole; 4. dovetail column; 5. dovetail groove; 6. radial expansion gap; 7. heat insulation layer; 8. wear-resistant coating; 9. buffer layer; 11. front plate; 12. rear plate. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] This invention provides a boiler tail flue structure, including a circular inner liner and a flue body 2. The circular inner liner covers the inner wall surface of the flue body 2 and is sequentially spliced ​​along the axial direction of the flue body 2. The circular inner liner includes several arc-shaped wear-resistant liner plates 1, which are sequentially spliced ​​to form a circular structure. The back of each wear-resistant liner plate 1 is provided with a dovetail column 4, and the inner wall surface of the flue body 2 is provided with a dovetail groove 5, in which the dovetail column 4 is fitted.

[0026] In the above embodiments, several wear-resistant liners are sequentially spliced ​​to form a ring-shaped structure, and the inner wall surface of the flue body is covered by the ring lining, which effectively improves the wear resistance of the flue body, thereby resisting the long-term scouring and wear of solid particles in the flue gas, and greatly extending the service life of the flue body.

[0027] The following detailed explanation illustrates the boiler tail flue structure provided by the present invention through several specific embodiments: Example As attached Figure 1-4 As shown, this embodiment provides a boiler tail flue structure, including a circular inner liner and a flue body 2; the circular inner liner covers the inner wall surface of the flue body 2 and is sequentially spliced ​​along the axial direction of the flue body 2; the circular inner liner includes a plurality of arc-shaped wear-resistant liners 1, and the plurality of wear-resistant liners 1 are sequentially spliced ​​to form a circular structure.

[0028] One end of the wear-resistant liner 1 is provided with a front groove, which is arranged along the axial direction of the wear-resistant liner 1 and communicates with the front surface of the wear-resistant liner 1; the other end of the wear-resistant liner 1 is provided with a rear groove, which is arranged along the axial direction of the wear-resistant liner 1 and communicates with the back surface of the wear-resistant liner 1; specifically, a predetermined area on the front surface of the first end of the wear-resistant liner 1 is recessed toward the back surface of the first end of the wear-resistant liner 1 to form the front groove; a predetermined area on the back surface of the second end of the wear-resistant liner 1 is recessed toward the front surface of the second end of the wear-resistant liner 1 to form the rear groove.

[0029] It should be noted that when two adjacent wear-resistant liners 1 are spliced, the front groove of one wear-resistant liner is connected to the rear groove of the other wear-resistant liner, and is fixedly connected to the inner wall of the flue body 2 by a preset fastener; specifically, the bottom surface of the rear groove of the liner is connected and tightly fitted to the groove of the front groove of the liner to achieve the splicing of two adjacent wear-resistant liners 1.

[0030] Both the front groove and the rear groove of the liner plate are provided with a plurality of fixing holes 3. A pre-set fixing member passes through the fixing holes on the rear groove and the front groove of the liner plate in sequence and is fixed in the inner wall of the flue body 2. The plurality of fixing holes 3 are spaced apart along the axial direction of the front groove or the rear groove of the liner plate and are staggered on both sides of the central axis of the front groove or the rear groove of the liner plate. Preferably, the pre-set fixing member is, for example, a bolt.

[0031] In this embodiment, the plurality of fixing holes 3 are staggered on both sides of the central axis of the front groove or the rear groove of the liner plate. The fixing holes 3 are arranged obliquely in the front groove or the rear groove of the liner plate, so that the preset fastener installed through the fixing holes 3 can apply constraint forces in multiple directions to the wear-resistant liner plate 1, thereby making the connection between the wear-resistant liner plate 1 and the inner wall of the flue body 2 more secure. When subjected to the impact of flue gas particles, the obliquely arranged fixing method can better disperse stress, improve the impact resistance of the wear-resistant liner plate 1, and reduce loosening or damage caused by excessive local stress.

[0032] The wear-resistant liner 1 includes a front plate 11 and a rear plate 12, both of which are arc-shaped plate structures. The front plate 11 and the rear plate 12 are fixed in an alternating manner. The back side of the front plate 11 is in contact with the front side of the rear plate 12, and the back side of the rear plate 12 is in contact with the inner wall surface of the flue body 2. Furthermore, the first end of the front plate 11 extends to the outer side of the first end of the rear plate 12 to form the liner front groove on the back side of the extended section of the first end of the front plate 11. The second end of the rear plate 12 extends to the outer side of the second end of the front plate 11 to form the liner rear groove on the back side of the extended section of the second end of the rear plate 12.

[0033] The back of the wear-resistant liner 1 is provided with a dovetail column 4, and the inner wall surface of the flue body 2 is provided with a dovetail groove 5. The dovetail column 4 is fitted into the dovetail groove 5. Specifically, the dovetail column 4 is provided on the back of the rear plate 12 and is arranged along the axial direction of the rear plate 12. The dovetail groove 5 is opened on the surface of the flue body 2, and the dovetail groove 5 and the dovetail column 4 are arranged in a one-to-one correspondence. A radial expansion gap 6 is reserved between the dovetail groove 5 and the dovetail column 4.

[0034] In this embodiment, a radial expansion gap 6 is reserved between the dovetail groove 5 and the dovetail column 4, which serves as the thermal expansion space for the wear-resistant liner 1 or the flue body 2. Specifically, during boiler operation, the wear-resistant liner 1 and the flue body 2 will undergo thermal expansion due to temperature changes. The reserved radial expansion gap 6 provides space for the thermal expansion of the wear-resistant liner 1 and the flue body 2, avoiding excessive stress caused by mutual compression due to thermal expansion, thereby preventing deformation or damage to the wear-resistant liner 1 and ensuring that the wear-resistant liner 1 can work normally under various operating conditions.

[0035] The front panel 11 and the rear panel 12 have the same structure, both including a hollow panel, a heat insulation layer 7 and a wear-resistant coating 8; the heat insulation layer 7 is filled inside the hollow panel, and the wear-resistant coating 8 is coated on the outer surface of the hollow panel; preferably, the heat insulation layer 7 is made of ceramic fiber cotton or aluminum silicate fiber felt, and the wear-resistant coating 8 is a tungsten carbide coating or an aluminum oxide coating.

[0036] In this embodiment, a heat insulation layer 7 is provided inside the front plate 11 and the rear plate 12. The heat insulation layer 7 is made of ceramic fiber cotton or aluminum silicate fiber felt. Ceramic fiber cotton and aluminum silicate fiber felt have excellent heat insulation performance, which can effectively prevent heat in the boiler tail flue 1 from being transferred outward and reduce the temperature of the outer wall of the flue 1. This not only helps to improve the thermal efficiency of the boiler and reduce energy waste, but also improves the working environment around the boiler and reduces the impact of high temperature on equipment and personnel.

[0037] In this embodiment, the surfaces of the front plate 11 and the rear plate 12 are coated with a wear-resistant coating 8, which is a tungsten carbide coating or an alumina coating. Tungsten carbide and alumina have extremely high hardness and good wear resistance. When coated on the surfaces of the front plate 11 and the rear plate 12, they can form a hard protective layer, effectively resisting the scouring and wear of solid particles in the flue gas, and significantly extending the service life of the liner.

[0038] It is worth noting that in this embodiment, the front plate 11 and the rear plate 12 are an integral structure; that is, the front plate 11 and the rear plate 12 in the wear-resistant liner 1 are integrally formed. The integrally formed front plate 11 and rear plate 12 eliminate the connection gap between the two, reduce stress concentration points, and further improve the overall strength and reliability of the wear-resistant liner 1. The structure can better withstand the impact of flue gas particles and the vibration generated by boiler operation, and enhance the wear resistance and impact resistance of the wear-resistant liner 1.

[0039] Another implementation of this embodiment is as follows: the front plate 11 and the rear plate 12 are designed separately, and a buffer layer 9 is provided between the front plate 11 and the rear plate 12; wherein, the buffer layer 9 is a rubber pad or a silicone pad; preferably, the thickness of the buffer layer 9 is 1-3mm; the buffer layer 9 plays a role in buffering and shock absorption, and when the boiler vibrates during operation, it can absorb and disperse some of the vibration energy, reducing the impact of vibration on the wear-resistant liner 1 and the inner wall of the flue body 2; at the same time, the buffer layer 9 can also fill the tiny gap between the inner wall of the flue body and the wear-resistant liner 1, making the connection between the two tighter and further improving the protective effect.

[0040] Construction method: In the boiler tail flue structure described in this embodiment, during construction, firstly, the flue body 2 is manufactured according to the design requirements; then, several wear-resistant liners 1 are sequentially spliced ​​to form a circular inner lining, and the circular inner lining is covered on the inner wall surface of the flue body 2; wherein, the dovetail columns 4 on the wear-resistant lining 1 are connected to the dovetail grooves 5 on the inner wall of the flue body 2.

[0041] Specifically, the construction method is as follows: First, the inner wall of the flue body 2 is cleaned to ensure that the surface is flat, clean, and free of debris and protrusions. Next, dovetail grooves 5 are installed at predetermined positions on the inner wall of the flue body 2. These dovetail grooves 5 can be integrally formed with the flue body 2 during manufacturing or construction. Then, a buffer layer 9 is laid on the inner wall of the flue body 2 at the contact point with the wear-resistant liner 1. Next, the dovetail posts 4 of the wear-resistant liner 1 are aligned with the dovetail grooves 5. Using the matching structure of the dovetail posts 4 and the dovetail grooves 5, the wear-resistant liner 1 is quickly positioned, ensuring that the dovetail posts 4 are fully embedded in the dovetail grooves 5, thus installing the wear-resistant liner 1 onto the inner wall of the flue body 2. Finally, the wear-resistant liner 1 is fixed to the inner wall of the flue body 2 using predetermined fasteners through the fixing holes 3 on the wear-resistant liner 1, ensuring a secure fixation between the wear-resistant liner 1 and the flue body 2. Finally, install all the wear-resistant liners 1 in sequence according to the above steps, ensuring that the wear-resistant liners 1 are tightly connected and flat.

[0042] When the boiler is running, high-temperature flue gas carrying fly ash flows through the tail flue, and the wear-resistant liner 1 comes into contact with the flue gas and fly ash. The wear-resistant coating 8 on the surface of the wear-resistant liner directly resists the scouring and abrasion of the fly ash, protecting the hollow plates of the front plate 11 and the rear plate 12. The heat insulation layer 7 inside the hollow plate blocks the transfer of high-temperature heat and reduces the wall temperature of the flue body 2. The staggered front plate 11 and the rear plate 12 and the strong connection structure ensure the stability of the wear-resistant liner 1 under scouring and vibration. In addition, the radial expansion gap 6 adapts to the thermal expansion of the wear-resistant liner 1 and the flue body 2, preventing them from deforming and being damaged. The buffer layer 9 can reduce the impact of vibration and impact, thereby achieving effective protection of the boiler tail flue.

[0043] The boiler tail flue structure described in this embodiment includes a wear-resistant liner 1 comprising a front plate 11 and a rear plate 12. Both the front plate 11 and the rear plate 12 are arc-shaped plate structures. The shape design of the arc-shaped plate structure can better fit the internal curved surface of the flue, reduce the gap between the liner and the inner wall of the flue body during installation, and improve the comprehensiveness and tightness of the protection.

[0044] In this embodiment, when the wear-resistant liner 1 is spliced, the front plate 11 and the rear plate 12 are fixed in an alternating manner, which increases the connection strength between the front plate and the rear plate, making the overall structure of the wear-resistant liner 1 more stable and able to better withstand the impact force of particles in the flue gas; wherein, a number of fixing holes 3 are opened on the non-overlapping parts of the front plate 11 and the rear plate 12, and the fixing holes 3 provide an installation position for fixing the wear-resistant liner 1 to the inner wall of the flue gas through preset fasteners.

[0045] In this embodiment, a dovetail column 4 is provided on the back of the rear plate 12, and a dovetail groove 5 matching the dovetail column 4 is provided on the inner wall of the flue body 2. When installing the wear-resistant liner 1, the design of the dovetail column 4 and the dovetail groove 5 plays a key positioning and guiding role. The operator can quickly and accurately insert the dovetail column 4 into the dovetail groove 5 to achieve rapid positioning of the wear-resistant liner 1 on the inner wall of the flue body 2, which greatly improves the installation efficiency. At the same time, the mating structure of the dovetail column 4 and the dovetail groove 5 has good shear resistance, which can prevent the wear-resistant liner 1 from shifting in the horizontal direction and ensure the stability of the installation.

[0046] The boiler tail flue structure described in this invention effectively improves the wear resistance of the wear-resistant liner by setting a wear-resistant coating and adopting a reasonable structural design and fixing method. It can resist the long-term scouring and wear of solid particles in the flue gas, greatly extending the service life of the flue. In particular, the internal heat insulation layer reduces heat transfer, improves the boiler's thermal efficiency, reduces energy consumption, and improves the working environment. The cooperation between the dovetail columns and dovetail grooves, and the staggered fixing of the front and rear plates or the obliquely cross-arranged fixing holes, make the connection between the wear-resistant liner and the inner wall of the flue body stable, with high overall structural strength, and able to withstand greater impact and vibration.

[0047] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A boiler tail flue structure, characterized in that, It includes a circular inner liner and a flue body (2), the circular inner liner covering the inner wall surface of the flue body (2) and being spliced ​​sequentially along the axial direction of the flue body (2); The annular liner includes several arc-shaped anti-wear plates (1), and the several anti-wear plates (1) are sequentially spliced ​​to form an annular structure. The wear-resistant liner (1) has a dovetail column (4) on its back side, and the inner wall surface of the flue body (2) has a dovetail groove (5). The dovetail column (4) is fitted into the dovetail groove (5).

2. The boiler tail flue structure according to claim 1, characterized in that, One end of the wear-resistant liner (1) is provided with a front groove, and the other end of the wear-resistant liner (1) is provided with a rear groove. When two adjacent wear-resistant liners (1) are spliced ​​together, the front groove of one wear-resistant liner is connected to the rear groove of the other wear-resistant liner, and is fixedly connected to the inner wall of the flue body (2) by a preset fastener.

3. The boiler tail flue structure according to claim 2, characterized in that, Several fixing holes (3) are provided on both the front groove and the rear groove of the liner. The pre-set fixing member passes through the fixing holes on the rear groove and the front groove of the liner in sequence and is fixed in the inner wall of the flue body (2).

4. The boiler tail flue structure according to claim 3, characterized in that, A number of the fixing holes (3) are spaced apart along the axial direction of the front groove of the liner or the rear groove of the liner, and are staggered on both sides of the central axis of the front groove of the liner or the rear groove of the liner.

5. A boiler tail flue structure according to claim 2, characterized in that, The wear-resistant liner (1) includes a front plate (11) and a rear plate (12), both of which are arc-shaped plate structures; the back of the front plate (11) is in contact with the front of the rear plate (12), and the back of the rear plate (12) is in contact with the inner wall surface of the flue body (2). Wherein, the first end of the front plate (11) extends to the outside of the first end of the rear plate (12) to form the front groove of the liner on the back side of the first end extension of the front plate (11); the second end of the rear plate (12) extends to the outside of the second end of the front plate (11) to form the rear groove of the liner on the back side of the second end extension of the rear plate (12).

6. The boiler tail flue structure according to claim 5, characterized in that, Both the front panel (11) and the rear panel (12) include a hollow panel, a heat insulation layer (7) and a wear-resistant coating (8); wherein the heat insulation layer (7) is filled inside the hollow panel, and the wear-resistant coating (8) is coated on the outer surface of the hollow panel.

7. A boiler tail flue structure according to claim 6, characterized in that, The heat insulation layer (7) is made of ceramic fiber cotton or aluminum silicate fiber felt, and the wear-resistant coating (8) is a tungsten carbide coating or an aluminum oxide coating.

8. A boiler tail flue structure according to claim 5, characterized in that, A buffer layer (9) is provided between the front plate (11) and the rear plate (12); wherein the buffer layer (9) is a rubber pad or a silicone pad.

9. The structure of the boiler tail flue according to claim 1, characterized in that, A radial expansion gap (6) is reserved between the dovetail groove (5) and the dovetail column (4).

10. A construction method for a boiler tail flue structure as described in any one of claims 1-9, characterized in that, include: First, the flue body (2) is manufactured according to the design requirements; then, several anti-wear lining plates (1) are spliced ​​together in sequence to form a circular inner lining, and the circular inner lining is covered on the inner wall surface of the flue body (2); wherein, the dovetail column (4) on the anti-wear lining plate (1) is connected to the dovetail groove (5) on the inner wall of the flue body (2).

Images