Anti-abrasion economizer tube stack structure

Abstract

The invention relates to an anti-wear economizer tube stack structure, which belongs to the technical field of economizer tube stacks, and comprises a tube stack frame body and a fixed cylinder fixed on the surface of the tube stack frame body, and a guide groove block for guiding is fixedly mounted on the inner wall of the fixed cylinder below the tube stack frame body. A plurality of guide groove blocks are arranged on the upper side of the inner wall of each guide groove block, a plurality of filtering holes used for filtering are formed in the upper side of the inner wall of each guide groove block, and a conveying assembly used for conveying impurities is arranged in the center of the upper portion of the inner wall of each guide groove block. And a further anti-abrasion structure is additionally arranged on the surface of the economizer pipe set, the effect that an inclined drainage structure is matched with an elastic structure to convert concentrated pressure into elastic potential energy and reduce instantaneous impact force is achieved, the anti-abrasion effect of the economizer pipe set can be better guaranteed, and then the overall use safety of the device is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of economizer tube assembly technology, specifically to a wear-resistant economizer tube assembly structure. Background Technology

[0002] Economizer tube assemblies are heat exchange components in the boiler tail flue. They consist of multiple sets of parallel serpentine steel or cast iron tubes. They utilize the waste heat of flue gas to preheat the boiler feedwater, reduce the exhaust gas temperature, and improve boiler efficiency. Economizer tube assemblies are arranged in the section of the boiler tail shaft where the flue gas temperature is relatively low. They can absorb the heat of the flue gas in the tail shaft, reduce the boiler exhaust gas temperature, thereby improving boiler thermal efficiency and saving fuel.

[0003] However, economizer tube assemblies may be subject to wear from particulate matter or fly ash in the flue gas during use, especially in coal-fired boilers, biomass boilers, or waste incinerators, where the wear is more severe. This is because the fly ash particles carried by the flue gas impact the tube walls of the economizer tube assembly, causing the metal surface to gradually peel off. This can lead to tube rupture accidents in the economizer tube assembly. Furthermore, wear on the economizer tube assembly can also reduce the heat exchange area, resulting in increased flue gas temperature and coal consumption in the boiler.

[0004] To solve the above problems, a wear-resistant economizer tube assembly structure is needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a wear-resistant economizer tube assembly structure, solving the problem that traditional devices cannot effectively prevent surface wear. It avoids the problem of fly ash particles carried by flue gas impacting the tube wall of the economizer tube assembly, leading to gradual peeling of the metal surface and causing tube rupture accidents. It also avoids the problem of reduced heat exchange area due to wear of the economizer tube assembly, thus preventing increased boiler flue gas temperature and coal consumption.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wear-resistant economizer tube assembly structure, comprising a tube assembly frame and a fixed cylinder fixed to the surface of the tube assembly frame. The inner wall of the fixed cylinder is fixedly installed with a guide groove block for guiding below the tube assembly frame, and the upper side of the inner wall of the guide groove block is provided with a plurality of filter holes for filtering. A conveying component for conveying impurities is provided at the center above the inner wall of the guide groove block. The tube assembly frame includes a plurality of S-shaped bends and a connecting main pipe fixed at both ends of the S-shaped bends. The walls of the S-shaped bends are all fixedly installed with a plurality of guide components for inclined guiding inside the fixed cylinder.

[0007] Furthermore, the conveying assembly includes a spiral feeding rod fixedly installed on the upper side of the inner wall of the guide trough, and a connecting cylinder is rotatably installed on the upper side of the inner wall of the guide trough around the spiral feeding rod. A discharge bend for centralized discharge is rotatably installed on the bottom surface of the connecting cylinder. Several turbulence fan blades for turbulence are fixedly installed on the surface of the connecting cylinder. The opposite sides of the upper part of the connecting cylinder wall are in contact with the upper side of the inner wall of the guide trough through fixed cleaning parts. A discharge slant for material discharge is opened between the two cleaning parts and the connecting cylinder.

[0008] Furthermore, the guide assembly includes an inclined baffle ring fixedly installed on the wall of the S-shaped bend, and a connecting arc block is fixedly installed on the lower side of the inclined baffle ring surface. A connecting shaft for connection is fixedly installed on the inclined baffle ring surface above the connecting arc block. A semi-circular deflector plate for impact resistance is rotatably installed on the surface of the connecting shaft, and a rotary spring for rotation is sleeved on the rod wall of the connecting shaft. The semi-circular deflector plate rotates around the connecting shaft under the impact of flue gas. The rotary spring stores and releases elastic potential energy, disperses the concentrated impact force, and reduces the instantaneous pressure peak. The stiffness of the rotary spring in this device can be selected from 50-100 N / mm to match flue gas pulses with different flow rates, avoid component fatigue caused by rigid collisions, and ensure the applicability of the internal structure of the device.

[0009] Furthermore, the cleaning component includes a collection trough block fixedly installed on one side of the surface of the connecting cylinder, and a through groove is provided on one side of the inner wall of the collection trough block, while a brush for brushing dust is fixedly installed on the side of the inner wall of the collection trough block away from the through groove.

[0010] Furthermore, the fixing cylinder has a square cylindrical structure, and fixing rings for fixing other equipment are fixedly installed on opposite sides of the surface of the fixing cylinder, and threaded holes for fixing are equally spaced on the circumference of the two fixing rings.

[0011] Furthermore, the inner wall of the guide groove is composed of a cylindrical section and a frustum section, and the filter holes are all hexagonal hole structures. The brush actuator includes a fixed groove block and a brush plate that is slidably installed on the inner wall of the fixed groove block, and the brush plate and the fixed groove block are directly fixedly connected by a number of damping springs.

[0012] Furthermore, the fixed cylinder, pipe assembly frame, guide groove block, and some turbulent flow fan blades are all made of CrMo heat-resistant steel, and the fixed cylinder, pipe assembly frame, guide groove block, and some turbulent flow fan blades are all provided with a thermally sprayed ceramic layer on their surface, and the thickness of the thermally sprayed ceramic layer is three millimeters. The internal structure of the device is made of CrMo heat-resistant steel, which has the following advantages: strong high-temperature performance, with a temperature resistance of 580-650℃, significantly better oxidation and creep resistance than carbon steel, wear and corrosion resistance, Cr2O3 oxide film resists flue gas corrosion, high hardness, fly ash erosion wear reduced by 30%-50%, high mechanical strength, tensile strength at high temperature is 2-3 times that of carbon steel, extending service life, and excellent economy, although the cost is 20%-30% higher than that of carbon steel.

[0013] Furthermore, the wall of the discharge bend is embedded and fixed to the bottom surface of the guide groove block, and the lower end of the discharge bend extends through the inner wall of the fixed cylinder to the surface of the fixed cylinder. Several of the turbulence fan blades are equidistantly arranged on the surface of the connecting cylinder, and the fixed position of the turbulence fan blades is located on the lower side of the surface of the connecting cylinder.

[0014] Furthermore, both collection troughs are trapezoidal trough structures, and the lower part of the inner wall of the collection trough is inclined. The inclination direction of the lower part of the inner wall of the collection trough is that the position closer to the connecting cylinder is lower than the position farther away from the connecting cylinder. The two collection troughs are symmetrically arranged with respect to the center of the spiral feeding rod. The two discharge inlets are inclined at the same angle to the inner wall of the collection trough, and the lower side of the inner wall of the discharge inlet is in contact with the lower part of the inner wall of the collection trough.

[0015] Furthermore, the included angle between the inclined stop rings and the S-shaped bend is set to θ, and 15°≤θ≤30°. The two ends of the rotary springs are respectively fixedly connected to the surface of the inclined stop rings and the surface of the semi-circular plate.

[0016] Compared with the prior art, the present invention provides a wear-resistant economizer tube assembly structure, which has the following beneficial effects: 1. This device utilizes a rotating fan-shaped structure to disperse concentrated high-speed flue gas flow into multiple turbulent streams, reducing wear on the economizer tube assembly. Furthermore, the device adds an additional wear-resistant structure to the surface of the economizer tube assembly. Through an inclined flow-guiding structure combined with an elastic structure, concentrated pressure is converted into elastic potential energy, reducing the instantaneous impact force and better ensuring the wear-resistant effect of the economizer tube assembly, thereby ensuring the overall safety of the device.

[0017] 2. The device is designed with a fixing ring and threaded holes, which facilitates connection with other equipment and enhances the ease of connection. The inner wall structure of the guide trough block ensures better flue gas inflow and facilitates flue gas entry, thereby ensuring the smooth rotation of the turbulence fan blades in the conveying assembly.

[0018] 3. The device utilizes a damping spring installed under the brush plate to ensure the brush plate fits snugly against the filter holes, thereby ensuring the removal of impurities and preventing impurities from clogging the filter holes, thus ensuring smooth flow of flue gas. The wear-resistant materials and coatings in the internal structure of the device improve its wear resistance, thereby ensuring overall wear resistance.

[0019] 4. The device ensures that the collection troughs are symmetrically arranged at the center of the collection troughs, so that the passage grooves on the collection troughs will not cause impurities to fall off prematurely during the rotation of the connecting cylinder. It ensures that all impurities cleaned from the parts pass through the inside of the collection troughs and are finally discharged by the screw feeder. Attached Figure Description

[0020] Figure 1 This is a frontal perspective view of the entire invention; Figure 2 This is a perspective view of the entire invention from below; Figure 3 This is a three-dimensional view of the entire invention. Figure 4 This is a perspective view of the guide component of the present invention; Figure 5 This is a perspective view of the semicircular dial of the present invention; Figure 6 This is a top perspective view of the guide groove block of the present invention; Figure 7 This is a vertical sectional perspective view of the guide groove block of the present invention; Figure 8 This is a perspective view of the connecting cylinder of the present invention. Figure 9 This is a vertical sectional perspective view of the connecting cylinder of the present invention; Figure 10 This is a top perspective view of the connecting cylinder of the present invention; Figure 11 This is a perspective view of the cleaning component of the present invention; Figure 12 This is a vertical sectional perspective view of the brush actuator of the present invention.

[0021] In the diagram: 1. Pipe assembly frame; 101. S-shaped bend; 102. Connecting main pipe; 2. Fixed cylinder; 201. Fixed ring; 202. Threaded hole; 3. Guide groove block; 301. Cylindrical section; 302. Frustum section; 4. Filter hole; 5. Conveying assembly; 501. Spiral feed rod; 502. Connecting cylinder; 503. Discharge bend; 504. Baffle fan; 505. Drop angle; 6. Guide assembly; 601. Inclined stop ring; 602. Connecting arc stop block; 603. Connecting shaft; 604. Semi-circular baffle plate; 605. Rotary spring; 7. Cleaning component; 701. Collection groove block; 702. Through groove; 703. Brushing component; 7031. Fixed groove block; 7032. Brush plate; 7033. Damping spring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 4 This embodiment describes a wear-resistant economizer tube assembly structure, including a tube assembly frame 1 and a fixed cylinder 2 fixed to the surface of the tube assembly frame 1. The fixed cylinder 2 is a square cylindrical structure, which facilitates fly ash settling and collection during use. Fixed rings 201 for fixing other equipment are fixedly installed on opposite sides of the surface of the fixed cylinder 2, and threaded holes 202 for fixing are equidistantly opened on the circumference of the two fixed rings 201. A guide groove block 3 for guiding is fixedly installed on the inner wall of the fixed cylinder 2 below the tube assembly frame 1. The inner wall of the guide groove block 3 is composed of a cylindrical section 301 and a frustum section 302. The combination of the cylindrical section 301 and the frustum section 302 in the inner wall of the guide groove block 3 facilitates better entry of flue gas. The guide trough 3 is located on the inner wall to ensure the flow of flue gas. The upper side of the inner wall of the guide trough 3 is provided with several filter holes 4 for filtration. The honeycomb hexagonal hole structure of the filter holes 4 makes the flue gas diffusion more uniform. The filter holes 4 are all hexagonal hole structures. The center of the upper part of the inner wall of the guide trough 3 is provided with a conveying component 5 for conveying impurities. The pipe frame 1 includes several S-shaped bends 101 and a connecting main pipe 102 fixed at both ends of the S-shaped bends 101. The connecting main pipe 102 can convey liquid into the S-shaped bends 101, thereby ensuring the basic function of the pipe frame 1. The pipe walls of the S-shaped bends 101 are located inside the fixed cylinder 2 and several guide components 6 for inclined guidance are fixedly installed.

[0024] The conveying assembly 5 includes a spiral feed rod 501 fixedly installed on the upper side of the inner wall of the guide trough block 3. A connecting cylinder 502 is rotatably installed on the upper side of the inner wall of the guide trough block 3 around the spiral feed rod 501. A discharge bend 503 for centralized discharge is rotatably installed on the bottom surface of the connecting cylinder 502. The wall of the discharge bend 503 is embedded and fixed to the bottom surface of the guide trough block 3, and the lower end of the discharge bend 503 extends through the inner wall of the fixed cylinder 2 to the surface of the fixed cylinder 2. Several turbulence vanes 504 for turbulence are fixedly installed on the surface of the connecting cylinder 502. The turbulence vanes 504 rotate autonomously under the impact of flue gas, decomposing the concentrated airflow into multiple turbulent flows, reducing the local flow velocity. The rotation speed is positively correlated with the flue gas velocity, achieving adaptive adjustment, thereby increasing the performance of the internal structure of the device. The fixed cylinder 2, the pipe assembly frame 1, the guide groove block 3, and the minor interference flow fan blades 504 are all made of 15CrMo heat-resistant steel. The fixed cylinder 2, the pipe assembly frame 1, the guide groove block 3, and the minor interference flow fan blades 504 are all provided with a thermally sprayed ceramic layer on their surface, and the thickness of the thermally sprayed ceramic layer is three millimeters. By using the above-mentioned material settings, the wear resistance of the structural surface can be better guaranteed, and the service life of the internal structure of the device can be increased. The opposite sides of the upper part of the connecting cylinder 502 are in contact with the upper side of the inner wall of the guide groove block 3 through fixed cleaning parts 7. The two cleaning parts 7 and the connecting cylinder 502 are both provided with a material discharge oblique opening 505 for material discharge. The minor interference flow fan blades 504 are equidistantly arranged on the surface of the connecting cylinder 502, and the fixed position of the minor interference flow fan blades 504 is located on the lower side of the surface of the connecting cylinder 502.

[0025] The guide assembly 6 includes a slanted retaining ring 601 fixedly installed on the wall of the S-shaped bend 101. A connecting arc stop 602 is fixedly installed on the lower side of the surface of the slanted retaining ring 601. The connecting arc stop 602 protects the slanted retaining ring 601 in its rotatable connection position, thereby ensuring the normal operation of the internal structure of the device. A connecting shaft 603 for connection is fixedly installed on the surface of the slanted retaining ring 601 above the connecting arc stop 602. A semi-circular deflector 604 for impact resistance is rotatably installed on the surface of the connecting shaft 603. The rod wall of the connecting shaft 603 is sleeved with a rotation mechanism. The included angle between the rotary spring 605, several inclined baffles 601 and the S-shaped bend 101 is set to θ, and 15°≤θ≤30°. The included angle of the inclined baffles 601, which is set between 15° and 30°, can balance the smoothness of airflow turning and the compactness of the structure. When the inclined angle is too small, that is, less than 15°, the length of the inclined baffles 601 needs to be extended to increase the frictional resistance. When the angle is too large, that is, greater than 30°, it will cause airflow separation and generate vortices. The two ends of the rotary springs 605 are fixedly connected to the surface of the inclined baffles 601 and the surface of the semi-circular baffle 604, respectively.

[0026] The cleaning component 7 includes a collection trough block 701 fixedly installed on one side of the surface of the connecting cylinder 502. A passage groove 702 is formed on one side of the inner wall of the collection trough block 701. Both collection trough blocks 701 are trapezoidal trough structures, and the lower part of the inner wall of the collection trough block 701 is inclined. The inclination direction of the lower part of the inner wall of the collection trough block 701 is such that the position closer to the connecting cylinder 502 is lower than the position farther from the connecting cylinder 502. The two collection trough blocks 701 are symmetrically arranged relative to the spiral feed rod 501. Two discharge inlets 505 have the same inclination angle as the inner wall of the collection trough block 701, and the lower side of the inner wall of the discharge inlets 505 is in contact with the lower part of the inner wall of the collection trough block 701. The side of the inner wall of the collection trough block 701 away from the passage groove 702... A brush actuator 703 for brushing is fixedly installed. The brush actuator 703 includes a fixed groove block 7031 and a brush plate 7032 that is slidably installed on the inner wall of the fixed groove block 7031. The brush plate 7032 and the fixed groove block 7031 are directly fixedly connected by several damping springs 7033. The damping springs 7033 installed in the brush actuator 703 can push the brush plate 7032 to better contact the upper side of the inner wall of the guide groove block 3. This can ensure that the brush actuator 703 can better achieve the effect of cleaning dust and removing impurities. The brush plate 7032 of this device is made of wear-resistant silicon carbide bristles. The scraped impurities are collected by the inclined collection groove block 701 and enter the spiral feed rod 501 through the discharge inclined port 505, thereby achieving the effect of self-cleaning and dust discharge in the device.

[0027] The working principle of the above embodiments is as follows: Before use, the device needs to be fixed to other equipment via the fixing ring 201 on the fixed cylinder 2. The specific fixing method can be bolt fastening. The device must be installed in the correct order, and the conveying component 5 must be placed at the bottom to ensure the wear resistance of the entire device. When the flue gas passes through the conveying component 5 inside the fixed cylinder 2, the flue gas will drive the turbulence fan 504 to rotate. The impacting flue gas will be dispersed by the rotation of the turbulence fan 504. The rotating turbulence fan 504 will disperse the concentrated high-speed flue gas flow into multiple streams, reducing the single-point concentrated impact on the tube frame 1, thereby reducing local wear. After being dispersed by the turbulence fan 504, the flue gas will pass through several hexagonal filter holes 4. The structure of the filter holes 4 has the effect of honeycomb gas transmission. The honeycomb structure can make the flue gas diffuse evenly before entering the economizer area, avoiding the local airflow from directly scouring the tube wall. By reducing the speed, the wear problem of the economizer tube group can be greatly reduced. Furthermore, the filter holes 4 can also filter out large particles of impurities, preventing them from entering the fixed cylinder 2 and causing wear on the surface of the economizer tube assembly. Impurities filtered onto one side of the filter holes 4 can be collected and removed from the device during the rotation of the turbulence fan 504. The rotation of the turbulence fan 504 drives the connecting cylinder 502 to rotate. Because the screw feed rod 501 is fixed, the screw feed rod 501 and the connecting cylinder 502 are in relative motion. The rotation of the connecting cylinder 502 drives the cleaning component 7 to clean the bottom surface of the filter holes 4. The cleaning component 7 scrapes away impurities from the filter hole 4 through the brush component 703. The scraped impurities fall into the collection trough 701. Utilizing the inclined effect of the lower inner wall of the collection trough 701, the impurities enter the connecting cylinder 502 through the discharge inlet 505. Under the spiral conveying of the relatively moving spiral feeder 501, they fall into the discharge bend 503, thus achieving the effect of uniformly discharging impurities and dust outside the device. During the operation of the device, the outlet end of the discharge bend 503 is in a sealed state, which will not affect the normal flue gas conveying effect. After the flue gas passes through the filter hole 4, it enters several guide components 6 and then exits through the device. At this point, the flue gas no longer has the ability to cause wear on the surface of the tube frame 1. Furthermore, the guide components 6 of the device can further disperse the impact force of the flue gas through the inclined baffle ring 601. The inclined baffle ring 601 can reduce resistance loss and guide the airflow diversion. In conjunction with the semi-circular deflector 604 on the elastically connected baffle ring 601, the impact force of the flue gas can be elastically buffered again, converting the concentrated pressure into elastic potential energy and reducing the instantaneous impact force. Moreover, the elastic semi-circular deflector 604 can adaptively adjust the buffering force according to the flue gas flow rate fluctuation, which is suitable for pulsed flue gas impact. Therefore, when the flue gas comes into contact with the tube frame 1 again, there is no problem of wear on the tube assembly, which increases the overall wear resistance of the device. The device highlights the innovative structure and will not elaborate too much on existing mature technologies.

[0028] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A wear-resistant economizer tube assembly structure, comprising a tube assembly frame (1) and a fixing cylinder (2) fixed to the surface of the tube assembly frame (1), characterized in that: The inner wall of the fixed cylinder (2) is fixedly installed with a guide groove block (3) for guiding below the pipe assembly frame (1), and a number of filter holes (4) for filtering are opened on the upper side of the inner wall of the guide groove block (3). A conveying component (5) for conveying impurities is provided at the center above the inner wall of the guide groove block (3). The pipe assembly frame (1) includes a number of S-shaped bends (101) and a connecting main pipe (102) fixed at both ends of the S-shaped bends (101). A number of guide components (6) for tilting guidance are fixedly installed inside the fixed cylinder (2) on the walls of the S-shaped bends (101).

2. The wear-resistant economizer tube assembly structure according to claim 1, characterized in that: The conveying assembly (5) includes a spiral feeding rod (501) fixedly installed on the upper side of the inner wall of the guide trough (3), and a connecting cylinder (502) is rotatably installed on the upper side of the inner wall of the guide trough (3) around the spiral feeding rod (501). A discharge bend (503) for centralized discharge is rotatably installed on the bottom surface of the connecting cylinder (502). Several turbulence fan blades (504) for turbulence are fixedly installed on the surface of the connecting cylinder (502). The opposite sides of the upper wall of the connecting cylinder (502) are in contact with the upper side of the inner wall of the guide trough (3) through fixed cleaning parts (7). A discharge oblique opening (505) for discharge is opened between the two cleaning parts (7) and the connecting cylinder (502).

3. The wear-resistant economizer tube assembly structure according to claim 2, characterized in that: The guide assembly (6) includes a slanted retaining ring (601) fixedly installed on the wall of the S-shaped bend (101), and a connecting arc stop block (602) is fixedly installed on the lower side of the surface of the slanted retaining ring (601). A connecting shaft (603) for connection is fixedly installed on the surface of the slanted retaining ring (601) above the connecting arc stop block (602). A semi-circular baffle (604) for impact resistance is rotatably installed on the surface of the connecting shaft (603), and a rotation spring (605) for rotation is sleeved on the rod wall of the connecting shaft (603).

4. The wear-resistant economizer tube assembly structure according to claim 3, characterized in that: The cleaning component (7) includes a collection trough block (701) fixedly installed on one side of the surface of the connecting cylinder (502), and a through groove (702) is provided on one side of the inner wall of the collection trough block (701), while a brushing component (703) for brushing is fixedly installed on the side of the inner wall of the collection trough block (701) away from the through groove (702).

5. The wear-resistant economizer tube assembly structure according to claim 1, characterized in that: The fixed cylinder (2) is a square cylindrical structure, and fixed rings (201) for fixing other equipment are fixedly installed on opposite sides of the surface of the fixed cylinder (2), and threaded holes (202) for fixing are equally spaced on the periphery of the two fixed rings (201).

6. The wear-resistant economizer tube assembly structure according to claim 4, characterized in that: The inner wall of the guide groove block (3) is composed of a cylindrical section (301) and a frustum section (302). The filter holes (4) are all hexagonal hole structures. The brush actuator (703) includes a fixed groove block (7031) and a brush plate (7032) that is slidably installed on the inner wall of the fixed groove block (7031). The brush plate (7032) and the fixed groove block (7031) are directly fixedly connected by a number of damping springs (7033).

7. The wear-resistant economizer tube assembly structure according to claim 3, characterized in that: The fixed cylinder (2), the pipe assembly frame (1), the guide groove block (3), and the minor interference flow fan blade (504) are all made of (15)CrMo heat-resistant steel. The fixed cylinder (2), the pipe assembly frame (1), the guide groove block (3), and the minor interference flow fan blade (504) are all provided with a thermally sprayed ceramic layer on their surface, and the thickness of the thermally sprayed ceramic layer is three millimeters.

8. The wear-resistant economizer tube assembly structure according to claim 2, characterized in that: The wall of the discharge bend (503) is embedded and fixed to the bottom surface of the guide groove block (3), and the lower end of the discharge bend (503) extends through the inner wall of the fixed cylinder (2) to the surface of the fixed cylinder (2). A number of the turbulence fan blades (504) are equidistantly arranged on the surface of the connecting cylinder (502), and the fixed position of the turbulence fan blades (504) is located on the lower side of the surface of the connecting cylinder (502).

9. The wear-resistant economizer tube assembly structure according to claim 4, characterized in that: Both collection troughs (701) are trapezoidal trough structures, and the lower part of the inner wall of the collection trough (701) is inclined. The inclination direction of the lower part of the inner wall of the collection trough (701) is that the position near the connecting cylinder (502) is lower than the position away from the connecting cylinder (502). The two collection troughs (701) are symmetrically arranged with respect to the spiral feeding rod (501). The two discharge inlets (505) are inclined at the same angle as the inner wall of the collection trough (701), and the lower side of the inner wall of the discharge inlet (505) is in contact with the lower part of the inner wall of the collection trough (701).

10. The wear-resistant economizer tube assembly structure according to claim 3, characterized in that: The included angle between several of the inclined stop rings (601) and the S-shaped bend (101) is set to θ, and 15°≤θ≤30°. The two ends of several of the rotary springs (605) are fixedly connected to the surface of the inclined stop ring (601) and the surface of the semi-circular lever plate (604), respectively.

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