Anti-corrosion flow guide device for chimney of thermal power plant

Abstract

A flow guide main pipe is arranged in the side wall of the chimney, spiral flow guide pieces are arranged on the inner wall of the flow guide main pipe, flow guide branch pipes are communicated with the flow guide main pipe, the flow guide main pipe penetrates out of the outer wall of the lower portion of the chimney, and the penetrating-out end of the flow guide main pipe is connected with a collecting box. The device can solve the problems that in the prior art, a flow guide channel is prone to being blocked, installation is troublesome, and a collecting box is inconvenient to clean, and through the optimal design of the spiral flow guide pieces and the collecting box, the acid liquor flow guide efficiency is improved, the installation process is simplified, and later maintenance is facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of chimney corrosion prevention, and relates to a chimney corrosion prevention and flow guide device for a thermal power plant. BACKGROUND

[0002] During the operation of a thermal power plant, the chimney, as a key passage for discharging flue gas, is often severely corroded by acid liquid entrained in the flue gas, which greatly shortens the service life of the chimney. In the prior art, although there are schemes for discharging acid liquid by setting a flow guide structure on the inner wall of the chimney, these schemes generally have problems such as that the flow guide channel is easily blocked by impurities and that the cleaning of the collection device is inconvenient, which affects the normal operation and corrosion prevention effect of the chimney.

[0003] Publication No. CN219797251U discloses a chimney inner wall corrosion prevention and flow guide structure, which comprises a plurality of flow guide units connected to the inner wall of the chimney and arranged above and below. The flow guide unit comprises an arc-shaped flow guide plate and a mounting plate fixed to the lower end of the flow guide plate. The mounting plate is connected to the inner wall of the chimney by stainless steel screws. The flow guide plate extends from the inner wall of the chimney to the center and upward. The bottom surface of the inner wall of the chimney on the inner side of the flow guide plate is provided with a liquid discharge port. A flow guide branch pipe is arranged at each liquid discharge port. The flow guide branch pipe is pre-set in the chimney wall. A flow guide main pipe is also pre-set in the chimney wall. The flow guide branch pipe is in communication with the flow guide main pipe. The flow guide main pipe penetrates out of the outer wall of the lower part of the chimney, and the penetrating end is connected to a collection box. The material of the flow guide plate and the mounting plate is ceramic with a smooth surface. Screw holes are formed in the mounting plate. During the discharge of flue gas, acid liquid flows downward along the flow guide plate. The acid liquid falls into the flow guide plate of the lower layer along the outer surface of the upper flow guide plate and is discharged into the collection box through the liquid discharge port, the flow guide branch pipe and the flow guide main pipe, thereby preventing the acid liquid from adhering to the inner wall of the chimney for a long time and reducing the corrosion of the inner wall of the chimney. Since the flow guide plate is made of ceramic, it has good corrosion resistance. In addition, the surface of the flow guide plate is smooth, so the acid liquid easily slides down along the surface of the flow guide plate and is discharged through the liquid discharge port. The flow guide main pipe and the flow guide branch pipe are made of epoxy resin corrosion-resistant steel pipes, which play a corrosion prevention role and prevent the acid liquid from damaging the flow guide main pipe and the flow guide branch pipe. A ring of sealing pads is embedded at the contact position of the mounting plate and the inner wall of the chimney to prevent the acid liquid from flowing into the chimney through the gap between the mounting plate and the chimney wall. The material of the sealing pad is polytetrafluoroethylene, which prevents the acid liquid from corroding the sealing pad. During the discharge of flue gas, acid liquid flows downward along the flow guide unit. The acid liquid falls into the flow guide plate of the lower layer along the outer surface of the upper flow guide plate and is discharged into the collection box through the liquid discharge port, the flow guide branch pipe and the flow guide main pipe, thereby preventing the acid liquid from adhering to the inner wall of the chimney for a long time and reducing the corrosion of the inner wall of the chimney.

[0004] Specifically, the flow guide channel of the partial flow guide structure lacks effective anti-clogging design, and the dust and other impurities in the flue gas are easy to deposit in the channel, causing poor acid liquid flow guide, reducing the corrosion prevention effect, and possibly affecting flue gas emission; meanwhile, the connection mode of the collection device for collecting acid liquid and the flow guide channel is complex, and when the acid liquid and impurities in the collection device accumulate to a certain extent, it is very cumbersome to disassemble and clean, increasing the maintenance cost and workload. Therefore, there is an urgent need for a power plant chimney corrosion prevention flow guide device that can effectively solve the above problems. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art and provide a power plant chimney corrosion prevention flow guide device that can solve the problems of easy clogging of the flow guide channel, difficult installation, and inconvenience of cleaning the collection box. The device improves acid liquid flow guide efficiency, simplifies the installation process, and facilitates later maintenance through the optimization design of the spiral flow guide sheet and the collection box.

[0006] To achieve the above purpose, the present application discloses a power plant chimney corrosion prevention flow guide device, comprising a plurality of flow guide units connected to the inner wall of the chimney and arranged above and below, the flow guide unit comprising an arc-shaped flow guide plate and a mounting plate fixed to the lower end of the flow guide plate, the mounting plate being connected to the inner wall of the chimney, the flow guide plate extending from the inner wall of the chimney to the center and upward, the bottom surface of the inner wall of the chimney on the inner side of the flow guide plate being provided with a drainage port, the drainage port being provided with a flow guide branch pipe, the flow guide branch pipe being arranged in the side wall of the chimney, the side wall of the chimney being provided with a flow guide main pipe, the inner wall of the flow guide main pipe being provided with a spiral flow guide sheet, the flow guide branch pipe being in communication with the flow guide main pipe, the flow guide main pipe being penetrated out of the outer wall of the lower part of the chimney, and the penetrated end being connected with a collection box.

[0007] The power plant chimney corrosion prevention flow guide device of the present application is further improved in that:

[0008] Further, the mounting plate is connected to the inner wall of the chimney by stainless steel screws.

[0009] Further, the spiral flow guide sheet extends spirally along the length direction of the flow guide main pipe, and the upper end and the lower end of the spiral flow guide sheet are fixedly connected to the inner wall of the flow guide main pipe.

[0010] Further, the penetrated end of the flow guide main pipe is provided with a flange, and the top of the collection box is provided with a connecting flange matched with the flange.

[0011] Further, the flange and the connecting flange are connected by bolts.

[0012] Further, the material of the flow guide plate and the mounting plate is smooth-surfaced ceramic.

[0013] Further, the flow guide main pipe and the flow guide branch pipe are epoxy resin corrosion-resistant steel pipes.

[0014] Further, a sealing gasket is embedded at the contact between the mounting plate and the inner wall of the chimney.

[0015] Further, the sealing gasket is made of polytetrafluoroethylene.

[0016] The application discloses a kind of power plant chimney anticorrosion flow guide device, including a plurality of connection in chimney inner wall and upper, lower flow guide unit, the flow guide unit includes arc flow guide plate and the mounting plate fixed in the lower end of flow guide plate, the mounting plate is connected with chimney inner wall, the flow guide plate is extended to chimney center and upwards from chimney inner wall, the bottom surface of chimney inner wall is provided with drain in the inside of flow guide plate, drain is provided with flow guide branch pipe, the flow guide branch pipe is arranged in the side wall of chimney, the side wall of chimney is provided with flow guide main pipe, the inner wall of flow guide main pipe is provided with helical flow guide piece, the flow guide branch pipe is communicated with flow guide main pipe, the flow guide main pipe is worn out from the outer wall of chimney lower part, and collecting box is connected to the worn end;

[0017] The material of the flow guide plate and the mounting plate is ceramic with smooth surface.

[0018] The flow guide main pipe and the flow guide branch pipe are epoxy resin anticorrosion steel pipes.

[0019] A sealing gasket is embedded at the contact between the mounting plate and the inner wall of the chimney.

[0020] The material of the sealing gasket is polytetrafluoroethylene.

[0021] The application has the following beneficial effects:

[0022] In the operation of the power plant chimney anticorrosion flow guide device, the bottom surface of the chimney inner wall inside the flow guide plate is provided with a drain, the drain is provided with a flow guide branch pipe, the flow guide branch pipe is arranged in the side wall of the chimney, the side wall of the chimney is provided with a flow guide main pipe, the inner wall of the flow guide main pipe is provided with a helical flow guide piece, the flow guide branch pipe is communicated with the flow guide main pipe, the flow guide main pipe is worn out from the outer wall of the lower part of the chimney, and a collecting box is connected to the worn end, the acid liquid is drained into the flow guide main pipe through the flow guide branch pipe, and then enters the collecting box under the guidance of the helical flow guide piece, to solve the problems of easy blockage of the flow guide channel, troublesome installation and inconvenient cleaning of the collecting box in the prior art, improve the acid liquid flow guide efficiency, simplify the installation process and facilitate the later maintenance.

[0023] Further, the flow guide plate, the mounting plate, the flow guide pipeline and other components are made of corrosion-resistant materials, which can effectively resist acid liquid erosion, prolong the service life of the device and improve the corrosion protection effect of the chimney.

[0024] Further, the guide plate is arc-shaped and extends from the inner wall of the chimney to the center and upward, using the kinetic energy of the rising flue gas and the gravity of the condensed liquid to form a "wall-adhesion flow guide-center throwing" dual effect: wall-adhesion flow guide: the condensed liquid flows downward along the surface of the guide plate to avoid direct scouring of the inner wall of the chimney; center throwing: the particulate matter carried by the flue gas is guided to the center of the chimney by the guide plate, reducing deposition on the inner wall. Precise positioning of the liquid outlet: the liquid outlet is arranged on the inner side of the bottom surface of the guide plate, forming a "flow guide-collection" integrated structure with the guide plate, ensuring that 100% of the condensed liquid enters the flow guide branch pipe and avoiding the formation of corrosive liquid accumulation on the inner wall of the chimney.

[0025] Further, the inner wall of the flow manifold is provided with spiral flow guide pieces to produce a cyclone effect in the condensed liquid during flow: accelerated liquid discharge: cyclone reduces fluid resistance, and the liquid discharge speed is increased by 30%-50%, reducing the risk of liquid accumulation in the pipe; self-cleaning function: the centrifugal force generated by the cyclone can strip off the particles attached to the pipe wall, preventing the flow guide manifold from being blocked. Epoxy resin corrosion-resistant steel pipe: the flow guide manifold and branch pipe are made of epoxy resin corrosion-resistant steel pipe, which is more than 5 times more resistant to acid and alkali corrosion than ordinary steel pipe, and is suitable for long-term corrosion by corrosive media such as SO2 and NOx in flue gas. Each guide plate + mounting plate forms an independent module, which is fixed to the inner wall of the chimney by bolts, and the installation time of a single module is <30 minutes. When repairing, only the faulty module needs to be replaced, without the need for overall shutdown. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. The use of these drawings in explaining the application does not constitute an inappropriate limitation on the scope of the application. In the drawings:

[0027] Figure 1 is a schematic diagram of the overall structure of the chimney corrosion-resistant flow guide device for a thermal power plant according to the present application;

[0028] Figure 2 is a specific enlarged view of the chimney corrosion-resistant flow guide device for a thermal power plant according to the present application; Figure 1

[0029] Figure 3 is a spiral flow guide piece and a flow guide manifold in the chimney corrosion-resistant flow guide device for a thermal power plant according to the present application;

[0030] Figure 4 is a schematic diagram of the three-dimensional structure of the collection box in the chimney corrosion-resistant flow guide device for a thermal power plant according to the present application.

[0031] wherein 1 is a chimney, 2 is a guide plate, 3 is a mounting plate, 4 is a liquid outlet, 5 is a flow guide branch pipe, 6 is a flow guide manifold, 7 is a spiral flow guide piece, 8 is a collection box, 9 is a flange, 10 is a connecting flange, 11 is a sealing gasket, and 12 is a stainless steel screw. DETAILED DESCRIPTION ​

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0033] In the description of the present application, it should be understood that the terms "comprising" and "including" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0034] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0036] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range without departing from the scope of the embodiments of the present application.

[0037] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted to mean "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0040] Embodiment one

[0041] With reference to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the chimney anticorrosion flow guide device of the present application for thermal power plants comprises a plurality of flow guide units connected to the inner wall of the chimney 1 and arranged upward and downward, the flow guide unit comprises an arc-shaped flow guide plate 2 and a mounting plate 3 fixed to the lower end of the flow guide plate 2, the mounting plate 3 is connected to the inner wall of the chimney 1, the flow guide plate 2 extends from the inner wall of the chimney 1 to the center and upward of the chimney, the bottom surface of the inner wall of the chimney 1 located inside the flow guide plate 2 is provided with a drainage port 4, a flow guide branch pipe 5 is arranged at the drainage port 4, the flow guide branch pipe 5 is arranged in the side wall of the chimney 1, a flow guide main pipe 6 is arranged in the side wall of the chimney 1, a helical flow guide fin 7 is arranged on the inner wall of the flow guide main pipe 6, the flow guide branch pipe 5 communicates with the flow guide main pipe 6, the flow guide main pipe 6 penetrates out of the outer wall of the lower part of the chimney 1, and a collecting box 8 is connected to the penetrating end; the materials of the flow guide plate 2 and the mounting plate 3 are ceramic with smooth surface; the flow guide main pipe 6 and the flow guide branch pipe 5 are epoxy anticorrosion steel pipes; a ring of sealing pads 11 is embedded at the contact position of the mounting plate 3 and the inner wall of the chimney 1; the material of the sealing pad 11 is polytetrafluoroethylene.

[0042] Embodiment two

[0043] In order to further improve the present application, with reference to Figure 1 , Figure 2、 Figure 3 and Figure 4 The chimney anticorrosion flow guide device for thermal power plant of the present application comprises a plurality of flow guide units connected to the inner wall of the chimney 1 and arranged upward and downward, the flow guide unit comprises an arc-shaped flow guide plate 2 and a mounting plate 3 fixed to the lower end of the flow guide plate 2, the mounting plate 3 is connected to the inner wall of the chimney 1 by stainless steel screws 12, the flow guide plate 2 extends from the inner wall of the chimney 1 to the center and upward of the chimney, the bottom surface of the inner wall of the chimney 1 located inside the flow guide plate 2 is provided with a liquid discharge port 4, a flow guide branch pipe 5 is arranged at each liquid discharge port 4, the flow guide branch pipe 5 is pre-installed in the wall of the chimney 1, a flow guide main pipe 6 is also pre-installed in the wall of the chimney 1, the inner wall of the flow guide main pipe 6 is provided with a spiral flow guide fin 7, the flow guide branch pipe 5 is in communication with the flow guide main pipe 6, the flow guide main pipe 6 penetrates out of the outer wall of the lower part of the chimney 1, and a collecting box 8 is connected to the penetrating end.

[0044] In this embodiment, the spiral flow guide fin 7 spirally extends along the length direction of the flow guide main pipe 6, and the upper end and the lower end of the spiral flow guide fin 7 are fixedly connected to the inner wall of the flow guide main pipe 6. The spiral flow guide fin with this structure can guide the acid liquid and impurities in the flow guide main pipe to flow along the spiral path, and generate centrifugal force in the flowing process, so that the impurities are more easily moved together with the acid liquid, reducing the deposition on the inner wall of the main pipe, thereby effectively reducing the probability of the flow guide main pipe being blocked, ensuring the smoothness of the acid liquid flow guide, and improving the continuous working capacity of the device.

[0045] In this embodiment, the penetrating end of the flow guide main pipe 6 is provided with a flange plate 9, the top of the collecting box 8 is provided with a connecting flange 10 matched with the flange plate 9, and the flange plate 9 and the connecting flange 10 are connected by bolts. The flange connection mode makes the disassembly between the collecting box and the flow guide main pipe simple and fast, when the acid liquid and impurities in the collecting box accumulate to a certain amount, the staff can quickly disassemble the collecting box for cleaning, greatly simplifying the maintenance process and reducing the maintenance difficulty.

[0046] In this embodiment, the materials of the flow guide plate 2 and the mounting plate 3 are ceramic with smooth surface. The ceramic material has good corrosion resistance and smooth surface characteristics, is not easy to attach acid liquid and impurities, can reduce the corrosion of the acid liquid to the flow guide plate and the mounting plate, and is convenient for the acid liquid to flow along the surface to the liquid discharge port, improving the flow guide effect.

[0047] In this embodiment, the flow guide main pipe 6 and the flow guide branch pipe 5 are epoxy resin anticorrosion steel pipes. The epoxy resin anticorrosion steel pipe has excellent acid corrosion resistance and can withstand the long-term erosion of acid liquid in the flue gas, ensuring the structural stability and service life of the flow guide branch pipe and the flow guide main pipe.

[0048] In the embodiment, a sealing gasket 11 made of polytetrafluoroethylene is embedded on the mounting plate 3 at the contact with the inner wall of the chimney 1. The sealing gasket can enhance the sealing between the mounting plate and the inner wall of the chimney, preventing the acid liquid from seeping into the chimney wall and causing corrosion; the polytetrafluoroethylene material has good corrosion resistance and sealing performance, and can ensure long-term stability of the sealing effect.

[0049] In use, the spiral flow guide 7 is first fixed to the inner wall of the flow guide main pipe 6, and then the flow guide main pipe 6 and the flow guide branch pipe 5 are pre-installed in the chimney 1 wall and connected; the sealing gasket 11 is embedded on the mounting plate 3, and the mounting plate 3 is attached to the inner wall of the chimney 1, so that the flow guide plate 2 extends in the preset direction, and the mounting plate 3 is fixed to the inner wall of the chimney 1 by the stainless steel screws 12; finally, the connecting flange 10 of the collection box 8 is aligned with the flange plate 9 of the flow guide main pipe 6, and the installation is completed by fastening with bolts.

[0050] In use, the acid liquid in the flue gas adheres to the surface of the flow guide plate 2, flows along the flow guide plate 2 to the liquid discharge port 4, and enters the flow guide main pipe 6 through the flow guide branch pipe 5. In the flow guide main pipe 6, the spiral flow guide 7 guides the acid liquid and impurities to flow along the spiral path, reducing the deposition of impurities. Finally, the acid liquid and impurities flow into the collection box 8 through the flow guide main pipe 6. When the collection box 8 needs to be cleaned, the bolts connected by the flanges are only needed to be disassembled, and then the collection box 8 can be removed for cleaning. After cleaning, the collection box 8 is connected and fixed with the flow guide main pipe 6 by the bolts.

[0051] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0052] It will be understood that the application is not limited to the precise structures hereinbefore described and as shown in the accompanying drawings, and that changes can be made therein without departing from the scope of the application. The scope of the application is defined only by the appended claims.

[0053] The above description is only the preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A corrosion-resistant flow guiding device for a thermal power plant chimney, characterized in that, The device includes several flow guiding units connected to the inner wall of the chimney (1) and arranged above and below. Each flow guiding unit includes an arc-shaped flow guiding plate (2) and an installation plate (3) fixed to the lower end of the flow guiding plate (2). The installation plate (3) is connected to the inner wall of the chimney (1). The flow guiding plate (2) extends from the inner wall of the chimney (1) toward the center of the chimney and upward. The bottom surface of the inner wall of the chimney (1) located inside the flow guiding plate (2) is provided with a drain outlet (4). A flow guiding branch pipe (5) is provided at the drain outlet (4). The flow guiding branch pipe (5) is located inside the side wall of the chimney (1). A flow guiding main pipe (6) is provided inside the side wall of the chimney (1). A spiral flow guiding plate (7) is provided on the inner wall of the flow guiding main pipe (6). The flow guiding branch pipe (5) is connected to the flow guiding main pipe (6). The flow guiding main pipe (6) extends out from the outer wall of the lower part of the chimney (1), and a collection box (8) is connected to the end of the extension pipe.

2. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The mounting plate (3) is connected to the inner wall of the chimney (1) by stainless steel screws (12).

3. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The spiral guide vane (7) extends spirally along the length of the main guide pipe (6), and the upper and lower ends of the spiral guide vane (7) are fixedly connected to the inner wall of the main guide pipe (6).

4. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The outlet end of the main guide pipe (6) is provided with a flange (9), and the top of the collection box (8) is provided with a connecting flange (10) that is compatible with the flange (9).

5. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The flange (9) is connected to the connecting flange (10) by bolts.

6. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The guide plate (2) and the mounting plate (3) are made of smooth ceramic.

7. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, The main guide pipe (6) and the branch guide pipe (5) are epoxy resin anti-corrosion steel pipes.

8. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 1, characterized in that, A sealing gasket (11) is embedded at the contact point between the mounting plate (3) and the inner wall of the chimney (1).

9. The anti-corrosion and flow guiding device for thermal power plant chimneys according to claim 8, characterized in that, The sealing gasket (11) is made of polytetrafluoroethylene.

10. A corrosion-resistant flow guiding device for a thermal power plant chimney, characterized in that, The device includes several flow guiding units connected to the inner wall of the chimney (1) and arranged above and below. Each flow guiding unit includes an arc-shaped flow guiding plate (2) and an mounting plate (3) fixed to the lower end of the flow guiding plate (2). The mounting plate (3) is connected to the inner wall of the chimney (1). The flow guiding plate (2) extends from the inner wall of the chimney (1) toward the center of the chimney and upwards. The bottom surface of the inner wall of the chimney (1) located inside the flow guiding plate (2) is provided with a drain outlet (4). A flow guide branch pipe (5) is provided at the drain outlet (4). The flow guide branch pipe (5) is located inside the side wall of the chimney (1). A flow guide main pipe (6) is provided inside the side wall of the chimney (1). A spiral flow guide plate (7) is provided on the inner wall of the flow guide main pipe (6). The flow guide branch pipe (5) is connected to the flow guide main pipe (6). The flow guide main pipe (6) extends out from the outer wall of the lower part of the chimney (1), and a collection box (8) is connected to the end of the extension pipe. The guide plate (2) and the mounting plate (3) are made of smooth ceramic. The main guide pipe (6) and the branch guide pipe (5) are epoxy resin anti-corrosion steel pipes; A sealing gasket (11) is embedded at the contact point between the mounting plate (3) and the inner wall of the chimney (1); The sealing gasket (11) is made of polytetrafluoroethylene.

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