A pipeline for preventing oxidation skin accumulation in a supercritical reheater boiler

Abstract

The present invention discloses an anti-oxidation skin accumulation pipeline for a supercritical reheat boiler, including a pipeline unit, which includes a lower elbow pipeline, an ash discharge pipeline arranged at the bottom end of the lower elbow pipeline, a sealed box arranged at the top end of the lower elbow pipeline, and an ash discharge assembly arranged in the ash discharge pipeline; and a dust sweeping unit, which includes a driving assembly arranged in the sealed box and connected to the ash discharge assembly, and a dust sweeping assembly arranged on the driving assembly and located in the lower elbow pipeline. The beneficial effect of the present invention is that by arranging a dust sweeping unit and an ash discharge assembly in the lower elbow pipeline, the dust deposited at the bottom of the lower elbow of the vertical pipeline can be swept onto the ash discharge assembly, and the dust on the ash discharge assembly can be sent out of the pipeline through the ash discharge pipeline, so as to discharge the dust deposited inside the lower elbow pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of reheating boilers, and particularly to a pipeline for preventing oxidation scale accumulation in a supercritical reheating boiler. Background Art

[0002] At present, due to the relatively high operating parameters of high-temperature reheating boilers in thermal power plants above supercritical pressure, it is inevitable to generate high-temperature oxidation scale inside the pipe walls due to factors such as the high-temperature oxidation resistance of the material, high-temperature flue gas in the furnace, arrangement of heating surfaces, and flow distribution. Moreover, the oxidation scale is prone to peeling off. The peeled oxidation scale flows with the steam, and most of it is carried into the steam turbine. In some cases, it will deposit at the bottom of the lower elbow of the vertical pipeline, hindering the steam flow. If not cleaned in time, it will cause a reduction in the flow rate inside the furnace tube during the boiler startup process, resulting in overheating and bursting of the tubes, seriously affecting the safe and stable operation of the power plant equipment.

[0003] The existing method for cleaning the oxidation scale during boiler shutdown requires cutting open the lower elbow of each tube of the heating surface, sucking out the oxidation scale with a vacuum cleaner or a magnetic rod, and then welding and restoring. There are still great safety risks of falling from a height during the construction process. Moreover, adding an additional weld joint for the tube will also reduce the service life of the pipeline. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the above-mentioned problem of oxidation scale accumulation in the pipeline of the existing supercritical reheating boiler, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a pipeline for preventing oxidation scale accumulation in a supercritical reheating boiler.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A pipeline for preventing oxidation scale accumulation in a supercritical reheating boiler, comprising a pipeline unit, including a lower elbow pipeline, an ash discharge pipeline provided at the bottom end of the lower elbow pipeline, a sealed box provided at the top end of the lower elbow pipeline, and an ash discharge assembly provided in the ash discharge pipeline; and a dust sweeping unit, including a driving assembly provided in the sealed box and connected to the ash discharge assembly, and a dust sweeping assembly provided on the driving assembly and located in the lower elbow pipeline.

[0008] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the sealed box includes an L-shaped box body arranged on the lower elbow pipeline, two partition plates arranged in the box body, and a power chamber, a dust sweeping chamber and an ash discharging chamber separated by the partition plates, and the dust sweeping chamber communicates with the top end of the elbow pipeline.

[0009] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the driving assembly includes a servo motor arranged in the power chamber, a first lead screw arranged in the dust sweeping chamber and having one end penetrating into the power chamber and connected to the servo motor, and a first slide rod arranged in the dust sweeping chamber.

[0010] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the dust sweeping assembly includes a first slider arranged on the first lead screw and connected to the first slide rod, an extension plate arranged on the first slider, a rotating gear arranged at the end of the extension plate, a scraping plate arranged on the rotating gear, and a rack arranged in the dust sweeping chamber and meshing with the rotating gear through the first slider.

[0011] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the scraping plate includes a connecting frame arranged on the rotating gear, a hollow plate body arranged at the end of the connecting frame, a sector-shaped scraping plate arranged at the bottom end of the plate body, and a scraping hair arranged at the bottom end of the scraping plate.

[0012] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the rack includes a tooth body arranged in the dust sweeping chamber and made of magnetic metal as a whole, and a driving tooth meshing with the rotating gear. A limiting member is arranged on the scraping plate. The limiting member includes a magnetic attraction stone arranged on the scraping plate and magnetically attracted to the tooth body, and a roller arranged between the magnetic attraction stone and the tooth body.

[0013] As a preferred embodiment of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention, wherein: the driving assembly further includes a first bevel gear arranged on the first lead screw penetrating into the ash discharging chamber, a second lead screw arranged in the ash discharging chamber, a second bevel gear arranged on the second lead screw and meshing with the first bevel gear, and a second slide rod arranged in the ash discharging chamber.

[0014] As a preferred embodiment of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention, the following is provided: The ash discharging assembly includes a second slider disposed on the second sliding rod and connected to the second sliding rod, a connecting rod disposed on the second slider, a lower supporting plate disposed at the bottom end of the connecting rod and located in the ash discharging pipeline, and an upper sealing plate disposed at the middle end of the connecting rod and slidably inserted into the ash discharging pipeline.

[0015] As a preferred embodiment of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention, the following is provided: The lower supporting plate and the upper sealing plate are configured as oval plates with a concave middle and upturned sides, and the lower supporting plate and the upper sealing plate are arranged with their concave sides facing each other.

[0016] As a preferred embodiment of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention, the following is provided: The driving assembly further includes a mounting member, and the mounting member includes two elastic members disposed on both sides of the first slider.

[0017] The beneficial effects of the present invention are as follows: By arranging a dust sweeping unit and an ash discharging assembly in the lower elbow pipeline, the dust deposited at the bottom of the lower elbow of the vertical pipeline can be swept onto the ash discharging assembly, and then the dust on the ash discharging assembly can be sent out of the pipeline through the ash discharging pipeline, thereby achieving the discharge of the deposited dust inside the lower elbow pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0019] Figure 1 It is a schematic diagram of the overall structure of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention.

[0020] Figure 2 It is a schematic diagram of the sectional structure of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention.

[0021] Figure 3 For Figure 2 The partial structure schematic diagram in

[0022] Figure 4 It is a schematic diagram of the structure of the dust sweeping assembly of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the ash discharging assembly of the anti-oxidation skin accumulation pipeline of the supercritical reheat boiler of the present invention.

[0024] Figure 6 This is a schematic diagram of the ash discharge form of the pipeline for preventing oxide skin accumulation in the supercritical reheating boiler of the present invention. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0026] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0028] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally not in accordance with the general ratio, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0029] Embodiment 1

[0030] Referring to Figure 1-2 , a schematic diagram of the overall structure of a pipeline for preventing oxide skin accumulation in a supercritical reheating boiler is provided. As Figure 1 , a pipeline for preventing oxide skin accumulation in a supercritical reheating boiler includes a pipeline unit 100 and a dust sweeping unit 200. The dust sweeping unit 200 is used to clean the dust inside the pipeline unit 100 to achieve the purpose of preventing oxide skin accumulation.

[0031] Specifically, the pipeline unit 100 includes a lower elbow pipeline 101, an ash discharge pipeline 102 provided at the bottom end of the lower elbow pipeline 101, a sealed box 103 provided at the top end of the lower elbow pipeline 101. The sealed box 103 is communicated with the lower elbow pipeline 101, and an ash discharge assembly 104 provided in the ash discharge pipeline 102. The ash discharge assembly 104 can adopt a cylinder that passes through the lower elbow pipeline 101 and enters the ash discharge pipeline 102, and a plug block connected to the cylinder.

[0032] Further, the ash-sweeping unit 200 includes a driving component 201 disposed in the sealed box 103 and connected to the ash-discharging component 104, and an ash-sweeping component 202 disposed on the driving component 201 and located in the lower elbow pipe 101. The ash-sweeping component 202 can use a cylinder to control the brush.

[0033] Operation process: Scale will accumulate at the bottom of the lower elbow of the vertical pipe. The ash-sweeping component 202 sweeps the scale accumulated at the bottom end of the lower elbow pipe 101 into the ash-discharging component 104, and the ash-discharging component 104 sends the scale out of the ash-discharging pipe 102, so as to achieve the purpose of preventing scale accumulation.

[0034] Embodiment 2

[0035] Referring to Figure 1-4 , the difference between this embodiment and the first embodiment is that the sealed box 103 includes an L-shaped box body 103a disposed on the lower elbow pipe 101, two partition plates 103b disposed in the box body 103a, and a power chamber 103c, an ash-sweeping chamber 103d, and an ash-discharging chamber 103e separated by the partition plates 103b. The ash-sweeping chamber 103d communicates with the top end of the elbow pipe.

[0036] Specifically, the driving component 201 includes a servo motor 201a disposed in the power chamber 103c. The servo motor 201a is fixed to the box body 103a, a first lead screw 201b disposed in the ash-sweeping chamber 103d and having one end passing through the power chamber 103c and connected to the servo motor 201a, the first lead screw 201b is rotatably connected to the box body 103a, and a first sliding rod 201c disposed in the ash-sweeping chamber 103d. The first sliding rod 201c is fixed to the box body 103a.

[0037] The ash-sweeping component 202 includes a first slider 202a disposed on the first lead screw 201b and connected to the first sliding rod 201c, an extension plate 202b disposed on the first slider 202a, a rotating gear 202c disposed at the end of the extension plate 202b, a scraping plate 202d disposed on the rotating gear 202c, and a rack 202e disposed in the ash-sweeping chamber 103d and passing through the first slider 202a and meshing with the rotating gear 202c. The rack 202e is fixed to the box body 103a. The rotating gear 202c can drive the scraping plate 202d to rotate and abut against the lower elbow pipe 101 to clean the scale. When the scraping plate 202d is not working, it is in a horizontal state and fits against the top end of the lower elbow pipe 101.

[0038] The scraping plate 202d includes a connecting frame 202d-1 arranged on the rotating gear 202c, a hollow plate body 202d-2 arranged at the end of the connecting frame 202d-1. The hollow of the plate body 202d-2 can reduce the blockage of the pipeline steam. A sector-shaped scraping plate 202d-3 is arranged at the bottom end of the plate body 202d-2, and a scraping hair 202d-4 is arranged at the bottom end of the scraping plate 202d-3.

[0039] The rack 202e includes a tooth body 202e-1 arranged in the ash-sweeping cavity 103d and made of magnetic metal as a whole, and a driving tooth 202e-2 meshing with the rotating gear 202c. A limiting member 202d-5 is arranged on the scraping plate 202d. The limiting member 202d-5 includes a magnetic attraction stone 202d-51 arranged on the scraping plate 202d and magnetically attracted to the tooth body 202e-1, and a roller 202d-52 arranged between the magnetic attraction stone 202d-51 and the tooth body 202e-1. The magnetic attraction between the magnetic attraction stone 202d-51 and the tooth body 202e-1 can fix the scraping plate 202d and push the accumulated scale when the scraping plate 202d moves. The roller 202d-52 facilitates the sliding of the magnetic attraction stone 202d-51 along the tooth body 202e-1.

[0040] The rest of the structure is the same as that of Embodiment 1.

[0041] Operation process: When cleaning the accumulated scale in the lower elbow pipe 101, the servo motor 201a drives the first lead screw 201b to rotate, driving the first slider 202a to slide along the first slide rod 201c. At the same time, the rotating gear 202c moves relative to the driving tooth 202e-2. The rotating gear 202c drives the horizontally placed scraping plate 202d to rotate. After the rotating gear 202c disengages from the driving tooth 202e-2, the scraping plate 202d is in a vertical state, and the scraping hair 202d-4 abuts against the lower elbow pipe 101. The magnetic attraction stone 202d-51 adsorbs to the tooth body 202e-1. When the first slider 202a moves, the scraping plate 202d-3 and the scraping hair 202d-4 clean the accumulated scale in the lower elbow pipe 101, sweeping it onto the ash-discharging assembly 104, and being sent out from the ash-discharging pipe 102 by the ash-discharging assembly 104, achieving the purpose of preventing the accumulation of scale.

[0042] Embodiment 3

[0043] Refer to Figure 1-6, what is different from the above embodiments in this embodiment is that the driving assembly 201 further includes a first bevel gear 201d arranged on a first lead screw 201b penetrating into the ash discharge chamber 103e, a second lead screw 201e arranged in the ash discharge chamber 103e, the second lead screw 201e is rotatably connected to the box body 103a, a second bevel gear 201f fixedly arranged on the second lead screw 201e and meshing with the first bevel gear 201d, and a second slide rod 201g arranged in the ash discharge chamber 103e, and the second slide rod 201g is fixed to the box body 103a.

[0044] Specifically, the ash discharge assembly 104 includes a second slider 104a arranged on the second slide rod 201g and connected to the second slide rod 201g, a connecting rod 104b arranged on the second slider 104a, a lower support plate 104c arranged at the bottom end of the connecting rod 104b and located in the ash discharge pipe 102, the lower support plate 104c and the ash discharge pipe 102 are sealed by a sealing ring, the sealing ring is embedded in the lower support plate 104c, and an upper sealing plate 104d arranged at the middle end of the connecting rod 104b and slidably inserted into the ash discharge pipe 102, the upper sealing plate 104d descends and is inserted into the ash discharge pipe 102, and is sealed with the ash discharge pipe 102 by a sealing ring, and the sealing ring is embedded in the upper sealing plate 104d.

[0045] Further, the lower support plate 104c and the upper sealing plate 104d are arranged as oval plates with a concave middle and upturned sides, and the lower support plate 104c and the upper sealing plate 104d are arranged with opposite concavities. The shape of the connection between the ash discharge pipe 102 and the lower elbow pipe 101 is the same as that of the lower support plate 104c. There is an installation groove above the lower elbow pipe 101 that is the same as the upper sealing plate 104d. The upper sealing plate 104d can fit into the installation groove without occupying the internal space of the lower elbow pipe 101 and reducing the contact area with the steam in the pipe;

[0046] Among them, the scale will accumulate on the lower support plate 104c as the steam flows, and a small amount of scale will also accumulate in the steam flow direction.

[0047] The driving assembly 201 further includes a mounting member 201h. The mounting member 201h includes two elastic members 201h-1 arranged on both sides of the first slider 202a. The elastic members 201h-1 can be springs and metal shrapnel, preferably springs. The springs are sleeved outside the first lead screw 201b. When the first slider 202a reaches the end of the first lead screw 201b, it will squeeze the elastic members 201h-1 and disengage from the first lead screw 201b;

[0048] The remaining structures are the same as those in Embodiment 2.

[0049] Operation process: When cleaning the scale accumulated in the lower elbow pipe 101, the servo motor 201a drives the first lead screw 201b to rotate. The elastic member 201h-1 squeezes the first slider 202a to cooperate with the first lead screw 201b, and slides along the first slide rod 201c as the first lead screw 201b rotates. At the same time, the rotating gear 202c moves relative to the driving tooth 202e-2, and the rotating gear 202c drives the horizontally placed scraping plate 202d to rotate. After the rotating gear 202c disengages from the driving tooth 202e-2, the scraping plate 202d is in a vertical state, and the scraping hair 202d-4 abuts against the lower elbow pipe 101, and the magnetic attraction stone 202d-51 adsorbs to the tooth body 202e-1. When the first slider 202a moves, the scraping plate 202d-3 and the scraping hair 202d-4 clean the scale accumulated in the lower elbow pipe 101. When the first lead screw 201b rotates, it drives the first bevel gear 201d to rotate, thereby driving the second bevel gear 201f and the second lead screw 201e to rotate, driving the second slider 104a to slide along the second slide rod 201g, driving the connecting rod 104b, the upper sealing plate 104d and the lower supporting plate 104c to descend. When the scraping plate 202d moves to the side of the lower supporting plate 104c along with the first slider 202a, the scale is swept onto the lower supporting plate 104c. At the same time, before the first slider 202a moves to the side of the lower supporting plate 104c, one of the elastic members 201h-1 on the first slider 202a abuts against the partition plate 103b, and when moving to the side of the lower supporting plate 104c, it squeezes the elastic member 201h-1 and disengages from the first lead screw 201b. After the first slider 202a disengages from the first lead screw 201b, the upper sealing plate 104d does not enter the ash discharge pipe 102, ensuring that all the scale is swept onto the lower supporting plate 104c. At the same time, the first lead screw 201b continues to rotate to drive the second lead screw 201e to rotate until the upper sealing plate 104d falls into the ash discharge pipe 102 and is completely sealed with the ash discharge pipe 102. When the upper sealing plate 104d is completely sealed with the ash discharge pipe 102, the lower supporting plate 104c leaves the ash discharge pipe 102, facilitating the cleaning of the scale in the lower supporting plate 104c. After that, the servo motor 201a reverses, driving the squeezed elastic member 201h-1 to push the first slider 202a to cooperate with the first lead screw 201b and move as the first lead screw 201b rotates. At the same time, the second lead screw 201e reverses to drive the second slider 104a, the connecting rod 104b, the upper sealing plate 104d and the lower supporting plate 104c to rise. When the first slider 202a first moves to the end of the first lead screw 201b away from the lower supporting plate 104c, the rotating gear 202c meshes with the driving tooth 202e-2, making the scraping plate 202d rotate to a horizontal state, reducing the contact area with the steam in the pipe. At the same time, the first slider 202a squeezes the elastic member 201h-1 and disengages from the first lead screw 201b. The servo motor 201a continues to rotate until the upper sealing plate 104d moves into the installation groove.At this time, the lower support plate 104c is connected and overlapped with the ash discharge pipe 102 and the lower elbow pipe 101, waiting for the next ash cleaning.

[0050] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various elements, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0051] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present invention, or those features that are not relevant to implementing the present invention).

[0052] It should be understood that in the development of any actual implementation, as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A supercritical reheat boiler anti-scale accumulation pipe, characterized by: including, a pipeline unit (100) including a lower elbow pipeline (101), an ash discharge pipeline (102) disposed at the bottom end of the lower elbow pipeline (101), a sealed box (103) disposed at the top end of the lower elbow pipeline (101), and an ash discharge assembly (104) disposed in the ash discharge pipeline (102); and, a dust sweeping unit (200) including a driving assembly (201) disposed in the sealed box (103) and connected to the ash discharge assembly (104), and a dust sweeping assembly (202) disposed on the driving assembly (201) and located in the lower elbow pipeline (101); the sealed box (103) includes an L-shaped box body (103a) disposed on the lower elbow pipeline (101), two partition plates (103b) disposed in the box body (103a), and a power cavity (103c), a dust sweeping cavity (103d) and an ash discharge cavity (103e) separated by the partition plates (103b), and the dust sweeping cavity (103d) communicates with the top end of the elbow pipeline; the driving assembly (201) includes a servo motor (201a) disposed in the power cavity (103c), a first lead screw (201b) disposed in the dust sweeping cavity (103d) and having one end passing through the power cavity (103c) and connected to the servo motor (201a), and a first slide rod (201c) disposed in the dust sweeping cavity (103d); the dust sweeping assembly (202) includes a first slider (202a) disposed on the first lead screw (201b) and connected to the first slide rod (201c), an extension plate (202b) disposed on the first slider (202a), a rotating gear (202c) disposed at the end of the extension plate (202b), a scraping plate (202d) disposed on the rotating gear (202c), and a rack (202e) disposed in the dust sweeping cavity (103d) and passing through the first slider (202a) and meshing with the rotating gear (202c); the scraping plate (202d) includes a connecting frame (202d-1) disposed on the rotating gear (202c), a hollow plate body (202d-2) disposed at the end of the connecting frame (202d-1), a sector-shaped scraping blade (202d-3) disposed at the bottom end of the plate body (202d-2), and a scraping hair (202d-4) disposed at the bottom end of the scraping blade (202d-3); The rack (202e) includes a tooth body (202e-1) disposed in the dust-sweeping cavity (103d) and entirely made of magnetic metal, and a driving tooth (202e-2) meshing with the rotating gear (202c). A limiting member (202d-5) is provided on the scraping plate (202d). The limiting member (202d-5) includes a magnetic stone (202d-51) disposed on the scraping plate (202d) and magnetically connected to the tooth body (202e-1), and a roller (202d-52) disposed between the magnetic stone (202d-51) and the tooth body (202e-1). The driving assembly (201) further includes a first bevel gear (201d) provided on the first lead screw (201b) penetrating into the ash discharge cavity (103e), a second lead screw (201e) disposed in the ash discharge cavity (103e), a second bevel gear (201f) provided on the second lead screw (201e) and meshing with the first bevel gear (201d), and a second sliding rod (201g) disposed in the ash discharge cavity (103e).

2. The anti-oxidation skin accumulation pipeline of the supercritical reheat boiler according to claim 1, wherein: The ash discharge assembly (104) includes a second slider (104a) disposed on the second sliding rod (201g) and connected to the second sliding rod (201g), a connecting rod (104b) disposed on the second slider (104a), a lower supporting plate (104c) disposed at the bottom end of the connecting rod (104b) and located in the ash discharge pipe (102), and an upper sealing plate (104d) disposed at the middle end of the connecting rod (104b) and slidably inserted into the ash discharge pipe (102).

3. The anti-oxidation skin accumulation prevention pipeline of the supercritical reheat boiler according to claim 2, characterized in that: The lower supporting plate (104c) and the upper sealing plate (104d) are arranged as oval plates with a concave middle and upturned sides, and the lower supporting plate (104c) and the upper sealing plate (104d) are arranged with their concave sides facing each other.

4. The anti-oxidation skin accumulation prevention pipeline of the supercritical reheat boiler according to claim 3, wherein: The driving assembly (201) further includes a mounting member (201h), and the mounting member (201h) includes two elastic members (201h-1) disposed on both sides of the first slider (202a).

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