A flue gas purification device for a steam generator

Abstract

The present application relates to the technical field of flue gas purification, in particular to a flue gas purification device for steam generator, comprising a purification pipe which is butt-jointed with the flue gas pipeline of the steam generator, and two annular structure down-flow gas hoods are fixedly installed in the purification pipe in vertical direction. The flue gas purification device for steam generator relies on the change of flue gas resistance to realize full-automatic circulating reversing filtration of filter cloth bags in down-flow and up-flow modes, so that the two sides of the filter cloth bags alternately participate in the flue gas dust removal work, the drawbacks of traditional one-way filtration and one-side dust accumulation and blockage are changed, the effective utilization rate of the filter cloth bags is greatly improved, the service life of the filter cloth bags is prolonged, the replacement frequency of equipment consumables and the downtime maintenance time are effectively reduced, and through the flexible convex pressure trigger linkage baffle structure, the air outlet channel is automatically isolated and the independent dust removal channel is opened during each filtration mode switching and the self-cleaning operation of the filter cloth bags, so that the problems of dust retention and secondary mixing into clean flue gas during the dust removal process are accurately avoided.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, specifically to a flue gas purification device for a steam generator. Background Technology

[0002] Currently, steam generators are widely used in various fields such as industrial production, food processing, and heating. Most industrial steam generators use solid materials such as biomass pellets and coal as fuel, which produces a large amount of dusty flue gas during combustion. This flue gas not only has a high content of suspended particulate matter and complex dust particle sizes, but also has the characteristics of high temperature, humidity, and strong adhesion. If directly emitted, it will seriously pollute the atmospheric environment. Therefore, it is necessary to use professional flue gas dust removal and purification equipment to complete the exhaust gas treatment and meet the environmental protection emission standards for industrial waste gas.

[0003] Currently, most dust removal equipment used in the industry to power steam generators is fixed baghouse dust collectors. These have a simple overall design and can only perform unidirectional, fixed-path flue gas filtration. Traditional equipment's filter bags only participate in dust filtration on one side of the working surface. Long-term dust accumulation and concentrated pressure on the working surface of the bags easily lead to problems such as localized blockage, wear, and bag clogging. This not only results in extremely low overall utilization of the filter bags, but also a continuous decrease in filtration accuracy as the amount of dust accumulates, short equipment lifespan, and high frequency of consumable replacement.

[0004] Meanwhile, traditional stationary dust collection equipment lacks autonomous reversing filtration and automatic dust removal functions. When filter bags become clogged and equipment resistance increases, the machine must be shut down, the equipment casing and filter components disassembled, and dust accumulated on the surface of the filter bags must be cleaned manually or the filter bags replaced directly. Frequent shutdowns for maintenance directly interrupt the continuous operation of the steam generator, significantly reducing industrial production efficiency and resulting in high manual maintenance costs. In addition, manual dust removal is difficult to completely remove residual dust inside the equipment. After the equipment restarts, the dust retained inside the equipment cavity can easily mix back into the clean flue gas, causing secondary dust backflow pollution. This leads to unstable flue gas emission indicators, making it difficult to continuously meet high environmental emission standards.

[0005] In addition, traditional dust removal equipment has an interconnected structure between the cleaning channel and the exhaust channel, without a linkage isolation structure design. During the cleaning operation, the detached dust can easily enter the exhaust channel with the airflow, further aggravating the problem of secondary pollution. Moreover, the few devices on the market with electronically controlled cleaning and electronically controlled reversing functions require a large number of precision electronic components such as solenoid valves, sensors, and controllers. In high-temperature, dusty flue gas environments, these precision electronic components are prone to aging and failure, resulting in high equipment failure rates and difficult maintenance. They cannot adapt to the long-term, continuous, complex, and harsh working conditions of steam generators, and their industry applicability is greatly limited.

[0006] In view of this, we propose a flue gas purification device for steam generators. Summary of the Invention

[0007] The purpose of this invention is to provide a flue gas purification device for steam generators, addressing the problems mentioned in the background art, such as low bag utilization, easy dust backflow during cleaning, and inability to adaptively switch filtration directions in existing steam generator flue gas bag filters. To achieve the above objective, this invention provides the following technical solution: a flue gas purification device for steam generators, comprising a purification pipe connected to a steam generator flue gas duct, wherein two annular co-current air hoods are fixedly installed vertically at intervals inside the purification pipe, and a counter-current air hood is correspondingly and fixed to the bottom side of the corresponding co-current air hood.

[0008] The internal vertical sealing and sliding assembly of the co-current air hood is a hollow cylindrical shell. The upper and lower end faces of the cylindrical shell are sealing end faces, which can seal and fit the end of the air hood to achieve air hood sealing and isolation. The upper and lower side walls of the cylindrical shell are respectively provided with air ports connecting the inside and outside of the cylindrical shell. A filter bag is fixedly installed inside the cylindrical shell.

[0009] The inner wall of the purification tube is vertically and symmetrically fixed with two inner discs, and the outer wall of the cylindrical shell is fixedly fitted with an outer disc, which is located between the two inner discs.

[0010] The inner wall of the purification tube is fixedly provided with elastic flexible protrusions at the positions corresponding to the two inner discs. The two flexible protrusions can respectively hold and limit the outer discs at the upper and lower positions, so that the cylindrical shell can form a dual working position that can automatically switch back and forth.

[0011] A front connecting pipe is fixedly connected between the lower counter-current air hood and the upper co-current air hood, and a rear connecting pipe is fixedly connected between the upper counter-current air hood and the lower co-current air hood.

[0012] The purification pipe has a dust removal port on its side wall, and a sealing baffle is rotatably installed inside the dust removal port. The sealing baffle is driven to rotate by a micro drive motor.

[0013] The flexible protrusion is internally fitted with a pressure trigger switch, which is electrically linked to a micro drive motor.

[0014] Preferably, the top of the upper side of the downstream hood is provided with a flue gas inlet for receiving flue gas, and the flue gas inlet is connected to the flue gas output pipe of the steam generator.

[0015] The side of the downstream air hood located on the lower side is fixedly connected to an air outlet pipe for discharging purified flue gas.

[0016] Preferably, the flexible protrusion has elastic deformation capability, the upper flexible protrusion is used to hold the outer disk to limit the upper working state of the cylindrical shell, and the lower flexible protrusion is used to hold the outer disk to limit the lower working state of the cylindrical shell.

[0017] Preferably, when the cylindrical shell is in the upper working state, the air port on the side wall of the cylindrical shell is aligned and connected with the co-current air hood, and the end face of the cylindrical shell seals and blocks the end of the co-current air hood to form a co-current filtration channel.

[0018] When the cylindrical shell is in the lower working state, the air port on the side wall of the cylindrical shell is aligned and connected with the counterflow air hood, and the end face of the cylindrical shell seals and blocks the end of the counterflow air hood to form a counterflow filtration channel.

[0019] Preferably, the dust removal port and the air outlet pipe are arranged adjacent to each other, and the sealing baffle rotates to cover the cross-section of the dust removal port and the air outlet pipe, so that the air outlet pipe and the dust removal port can be opened and closed mutually exclusively by rotating and switching.

[0020] Preferably, the micro drive motor integrates a time-delay reset module. After the pressure trigger switch senses the squeezing signal, it can start the micro drive motor, drive the sealing baffle to flip, and automatically reset after a preset delay.

[0021] Preferably, both the inner and outer discs are made of wear-resistant metal. The inner disc is fixedly welded to the inner wall of the purification pipe, and the outer disc is integrally formed with the outer wall of the cylindrical shell.

[0022] Preferably, the outer wall of the cylindrical shell and the contact surfaces of the co-current and counter-current air hoods are all covered with high-temperature resistant sealing gaskets to improve the overall airtightness after the workstation is switched.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this invention, an adaptive structure is adopted, which relies on the change of flue gas resistance to realize the fully automatic circulation and reversal filtration of filter bags in both forward and reverse flow. This allows the inner and outer working surfaces of the filter bags to alternately participate in the flue gas dust removal work, which changes the drawbacks of traditional filter bags that have unidirectional filtration and unilateral dust accumulation and blockage. This significantly improves the effective utilization rate of filter bags, extends the service life of filter bags, and effectively reduces the frequency of equipment consumable replacement and downtime maintenance.

[0025] In this invention, a flexible, raised pressure-triggered linkage baffle structure is used to automatically isolate the exhaust channel and open an independent cleaning channel during each filtration mode switch and bag self-cleaning operation. This precisely avoids the problems of dust retention and secondary mixing of clean flue gas during the cleaning process, continuously ensuring that the flue gas emissions of the steam generator meet the standards, and improving the stability of equipment operation and dust removal accuracy.

[0026] In this invention, the system operates by adaptive circulation based on flue gas pressure, eliminating the need for electromagnetic valves, complex sensors, and other electronic control components. It features a simple structure, high integration, and low failure rate, making it suitable for the complex flue gas conditions of high temperature and high dust content in biomass and coal-fired steam generators. It has strong environmental adaptability and significantly reduces the later maintenance costs of the equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the assembly of the co-current air hood and the counter-current air hood along the purification pipe of the present invention;

[0029] Figure 3 A three-dimensional structural cross-section of the present invention. Figure 1 ;

[0030] Figure 4 A three-dimensional structural cross-section of the present invention. Figure 2 ;

[0031] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 This is a front sectional view of the cylindrical shell of the present invention in its working state.

[0033] Figure 7 This is a front sectional view of the lower cylindrical shell of the present invention in its working state;

[0034] Figure 8 This is a three-dimensional structural cross-sectional view of the co-current air hood, the counter-current air hood, the front connecting pipe, and the rear connecting pipe of the present invention.

[0035] In the diagram: 1. Purification pipe; 2. Co-current hood; 3. Counter-current hood; 4. Cylindrical shell; 5. Air inlet; 6. Filter bag; 7. Inner disc; 8. Outer disc; 9. Flexible protrusion; 10. Pre-connecting pipe; 11. Rear-connecting pipe; 12. Ash removal port; 13. Sealing baffle; 14. Miniature drive motor; 15. Flue gas inlet; 16. Exhaust pipe. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1 to 8This invention provides a technical solution: a flue gas purification device for a steam generator, comprising a purification pipe 1 for connecting to the flue gas pipeline of the steam generator. The purification pipe 1 serves as the main supporting structure of the device, receiving the high-temperature, dust-laden flue gas discharged from the steam generator and providing an installation carrier for the internal gas path structure, filtration structure, and switching components. Two annular co-current air hoods 2 are fixedly installed vertically at intervals inside the purification pipe 1. Each co-current air hood 2 is paired with a counter-current air hood 3, which is fixed to the bottom side of the corresponding co-current air hood 2. The co-current air hoods 2 are used to construct the conventional flue gas flow path, while the counter-current air hoods 3 are used to construct the reverse flue gas flow path after the direction is reversed.

[0038] The internal vertically sealed sliding assembly of the co-current gas hood 2 contains a hollow cylindrical shell 4, which is the core reversing filter component. The upper and lower end faces of the cylindrical shell 4 are sealing end faces, which can seal and fit the end of the gas hood to achieve gas hood sealing and isolation, thereby ensuring that the flue gas will not crossflow when the gas path is switched.

[0039] The upper and lower sidewalls of the cylindrical shell 4 are respectively provided with air vents 5 connecting the inside and outside of the cylindrical shell 4. Unlike the traditional end-face ventilation structure, this structure sets the air vents 5 on the sidewalls, so that the end face of the cylindrical shell 4 is dedicated to sealing and the sidewalls are dedicated to ventilation, with a clear division of labor. A filter bag 6 is fixedly installed inside the cylindrical shell 4 to intercept and purify the dust in the flue gas flowing through the cylindrical shell 4.

[0040] Two inner discs 7 are vertically symmetrically fixed to the inner wall of the purification pipe 1. An outer disc 8 is fixedly fitted onto the outer wall of the cylindrical shell 4. The outer disc 8 is positioned between the two inner discs 7. The inner discs 7 and the outer disc 8 cooperate with each other to limit the maximum vertical sliding stroke of the cylindrical shell 4, preventing the cylindrical shell 4 from sliding off course or falling out of the working area. Flexible protrusions 9 are fixedly installed on the inner wall of the purification pipe 1 at positions corresponding to the two inner discs 7. The two flexible protrusions 9 can respectively hold and limit the outer disc 8 at the upper and lower positions, allowing the cylindrical shell 4 to form a dual working position that can automatically reciprocate and switch. It achieves purely mechanical autonomous reversal by relying on dynamic changes in flue gas resistance, without the need for electrically controlled valves or manual adjustment.

[0041] A front connecting pipe 10 is fixedly connected between the lower counter-current hood 3 and the upper co-current hood 2, and a rear connecting pipe 11 is fixedly connected between the upper counter-current hood 3 and the lower co-current hood 2. The two connecting pipes serve as backup air paths for reversal, and when the cylindrical shell 4 switches to the lower working position, they guide the reverse flue gas path to achieve counter-current flue gas filtration. A dust removal port 12 is opened on the side wall of the purification pipe 1, and a sealing baffle 13 is rotatably installed inside the dust removal port 12. The sealing baffle 13 is driven to rotate by a micro drive motor 14.

[0042] The flexible protrusion 9 is equipped with a pressure trigger switch, which is electrically linked to the micro drive motor 14. When the flexible protrusion 9 is switched at the station of the cylindrical shell 4, the channel switching is automatically triggered to achieve the effect of reversing dust removal.

[0043] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the top of the upper-side flow hood 2 is provided with a flue gas inlet 15 for receiving flue gas. The flue gas inlet 15 is connected to the flue gas output pipe of the steam generator and serves as the only flue gas input end of the equipment.

[0044] The side of the lower side of the co-current air hood 2 is fixedly connected to an air outlet pipe 16 for discharging purified flue gas, which serves as the output end of the equipment for regular purified flue gas.

[0045] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the flexible protrusion 9 has elastic deformation capability and is made of high-temperature resistant elastic rubber material, suitable for high-temperature flue gas conditions. The upper flexible protrusion 9 is used to hold the outer disk 8 to limit the upper working state of the cylindrical shell 4, ensuring stable normal flow filtration.

[0046] The lower flexible protrusion 9 is used to hold the outer disk 8 to limit the lower working state of the cylindrical shell 4, ensuring the stability of the countercurrent self-cleaning and countercurrent filtration conditions.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, when the cylindrical shell 4 is in the upper working state, the air port 5 on the side wall of the cylindrical shell 4 is aligned and connected with the co-current air hood 2, and the end face of the cylindrical shell 4 seals and blocks the end of the co-current air hood 2 to form a co-current filtration channel.

[0048] When the cylindrical shell 4 is in the lower working state, the air port 5 on the side wall of the cylindrical shell 4 is aligned and connected with the counterflow air hood 3, and the end face of the cylindrical shell 4 seals and blocks the end of the counterflow air hood 3 to form a counterflow filtration channel, thereby realizing alternating filtration on both the inside and outside of the same filter bag 6.

[0049] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8As shown, the dust removal port 12 and the air outlet pipe 16 are arranged adjacent to each other. The sealing baffle 13 rotates to cover the cross section of the channel between the dust removal port 12 and the air outlet pipe 16. By rotating and switching, the air outlet pipe 16 and the dust removal port 12 are mutually exclusive to open and close, ensuring that the air outlet channel is absolutely sealed during dust removal and preventing the falling dust from being mixed into the clean flue gas again.

[0050] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the micro drive motor 14 integrates a time-delay reset module. After the pressure trigger switch senses the squeezing signal, it can start the micro drive motor 14, drive the sealing baffle 13 to flip, and automatically reset after a preset time delay, ensuring that the normal filtration and exhaust state is automatically restored after the dust removal operation is completed.

[0051] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, both the inner plate 7 and the outer plate 8 are made of wear-resistant metal material, which is resistant to high temperature and deformation, and is suitable for long-term reciprocating mechanical impact.

[0052] The inner plate 7 is fixedly welded to the inner wall of the purification pipe 1, and the connection is firm.

[0053] The outer disk 8 and the outer wall of the cylindrical shell 4 are integrally formed, resulting in strong structural integrity and high sliding stability.

[0054] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, the outer wall of the cylindrical shell 4 and the contact surfaces of the co-current air hood 2 and the counter-current air hood 3 are all covered with high-temperature resistant sealing gaskets to improve the overall airtightness after the workstation is switched, prevent cross-flow of air and smoke, and ensure filtration accuracy.

[0055] A method of using a flue gas purification device for a steam generator includes the following steps:

[0056] S1. In the initial state, the outer disk 8 of the cylindrical shell 4 is held and limited by the upper flexible protrusion 9, so that the cylindrical shell 4 is stably kept in the upper working state. At this time, the end face of the cylindrical shell 4 is sealed and blocked at the end of the corresponding flow hood 2. The air port 5 on the side wall of the cylindrical shell 4 is aligned and connected with the flow hood 2 to form a flow filtration channel. The flue gas generated by the steam generator enters the equipment from the flue gas inlet 15 at the top of the upper flow hood 2, enters the interior of the cylindrical shell 4 through the air port 5 on the upper side wall of the cylindrical shell 4, and completes dust filtration through the inner surface of the filter bag 6. The dust is trapped on the inner wall of the filter bag 6. The purified flue gas flows out from the air port 5 on the lower side wall of the cylindrical shell 4, enters the interior of the lower flow hood 2, and is finally discharged outward through the exhaust pipe 16, completing the conventional flue gas purification operation.

[0057] S2. After long-term operation, dust continuously accumulates inside the filter bag 6, increasing the resistance to flue gas flow. When the flue gas pressure exceeds the clamping force of the upper flexible protrusion 9, the airflow pushes the cylindrical shell 4 downward, squeezing out the upper flexible protrusion 9 and falling to the lower position, where it is held and fixed by the lower flexible protrusion 9. At this time, the end face of the cylindrical shell 4 seals and blocks the end of the counter-current hood 3, and the air port 5 on the side wall of the cylindrical shell 4 is aligned and connected with the counter-current hood 3, forming a counter-current filtration channel. During the downward movement of the cylindrical shell 4, the flexible protrusion 9 is squeezed, triggering the pressure trigger switch inside the flexible protrusion 9, which starts the micro drive motor 14 to drive the sealing baffle 13 to flip, closing the outlet pipe 16 and opening the dust removal port 12, realizing the mutual exclusion switching of the channels. The flue gas enters the lower side wall air inlet 5 of the cylindrical shell 4 through the upper side flow hood 2 and the front connecting pipe 10. It then penetrates the filter bag 6 from bottom to top, and completes secondary filtration using the outside of the filter bag. At the same time, the reverse airflow washes away the dust accumulated on the inner wall of the filter bag, and the detached dust is discharged directly from the dust removal port 12.

[0058] S3. The reverse airflow continuously washes the filter bag 6, causing dust to fall off the surface of the bag and reducing the resistance to flue gas flow. When the pressure of the flue gas at the top exceeds the clamping limit force of the lower flexible protrusion 9, the cylindrical shell 4 automatically slides upward and resets to the upper co-current filtration state. At the same time, the micro drive motor 14 finishes its delayed operation, the sealing baffle 13 automatically resets, closes the cleaning port 12, opens the air outlet 16, and the equipment re-enters the normal co-current filtration mode. Repeating the above steps achieves fully automatic, reciprocating flue gas filtration and self-cleaning operation. The cylindrical shell 4 always seals the corresponding air hood through its own end face, ensuring that flue gas can only flow through the side wall air port 5, preventing cross-contamination and smoke leakage.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue gas purification device for a steam generator, comprising a purification pipe (1) connected to the flue gas duct of the steam generator, characterized in that: The purification pipe (1) has two annular co-current air hoods (2) fixedly installed at vertical intervals inside. Each of the two co-current air hoods (2) is matched with a counter-current air hood (3). The counter-current air hood (3) is fixed to the bottom side of the corresponding co-current air hood (2). The internal vertical sealing of the air hood (2) is fitted with a hollow cylindrical shell (4). The upper and lower ends of the cylindrical shell (4) are sealing ends, which can seal and fit the end of the air hood to achieve air hood sealing and isolation. The upper and lower side walls of the cylindrical shell (4) are respectively provided with air ports (5) that connect the inside and outside of the cylindrical shell (4). A filter bag (6) is fixedly installed inside the cylindrical shell (4). The inner wall of the purification tube (1) is vertically symmetrically fixed with two inner discs (7), and the outer wall of the cylindrical shell (4) is fixedly fitted with an outer disc (8), which is located between the two inner discs (7). The inner wall of the purification tube (1) is fixedly provided with elastic flexible protrusions (9) at the positions corresponding to the two inner discs (7). The two flexible protrusions (9) can respectively hold and limit the outer disc (8) at the upper and lower positions, so that the cylindrical shell (4) can form a dual working position that can be automatically switched back and forth. A front connecting pipe (10) is fixedly connected between the lower counterflow hood (3) and the upper co-flow hood (2), and a rear connecting pipe (11) is fixedly connected between the upper counterflow hood (3) and the lower co-flow hood (2). The purification pipe (1) has a dust removal port (12) on its side wall. A sealing baffle (13) is rotatably installed inside the dust removal port (12). The sealing baffle (13) is driven to rotate by a micro drive motor (14). The flexible protrusion (9) is internally fitted with a pressure trigger switch, which is electrically linked to the micro drive motor (14).

2. The flue gas purification device for a steam generator according to claim 1, characterized in that: The top of the upper-side flow hood (2) is provided with a flue gas inlet (15) for receiving flue gas, and the flue gas inlet (15) is connected to the flue gas output pipe of the steam generator. The side of the downstream air hood (2) located on the lower side is fixedly connected to an air outlet pipe (16) for discharging purified flue gas.

3. The flue gas purification device for a steam generator according to claim 1, characterized in that: The flexible protrusion (9) has elastic deformation capability. The upper flexible protrusion (9) is used to hold the outer disk (8) to limit the upper working state of the cylindrical shell (4), and the lower flexible protrusion (9) is used to hold the outer disk (8) to limit the lower working state of the cylindrical shell (4).

4. The flue gas purification device for a steam generator according to claim 1, characterized in that: When the cylindrical shell (4) is in the upper working state, the air port (5) on the side wall of the cylindrical shell (4) is aligned and connected with the co-current air hood (2), and the end face of the cylindrical shell (4) seals and blocks the end of the co-current air hood (2) to form a co-current filtration channel. When the cylindrical shell (4) is in the lower working state, the air port (5) on the side wall of the cylindrical shell (4) is aligned and connected with the counterflow air hood (3), and the end face of the cylindrical shell (4) seals and blocks the end of the counterflow air hood (3) to form a counterflow filtration channel.

5. The flue gas purification device for a steam generator according to claim 2, characterized in that: The cleaning port (12) and the air outlet (16) are arranged adjacent to each other. The sealing baffle (13) rotates to cover the channel cross section of the cleaning port (12) and the air outlet (16). The mutual exclusion opening and closing of the air outlet (16) and the cleaning port (12) are realized by rotating and switching.

6. The flue gas purification device for a steam generator according to claim 1, characterized in that: The micro drive motor (14) has an integrated delay reset module. After the pressure trigger switch senses the squeezing signal, it can start the micro drive motor (14), drive the sealing baffle (13) to flip, and automatically reset after a preset delay.

7. The flue gas purification device for a steam generator according to claim 1, characterized in that: Both the inner disk (7) and the outer disk (8) are made of wear-resistant metal. The inner disk (7) is fixedly welded to the inner wall of the purification pipe (1), and the outer disk (8) is integrally formed with the outer wall of the cylindrical shell (4).

8. The flue gas purification device for a steam generator according to claim 4, characterized in that: The outer wall of the cylindrical shell (4) and the contact surfaces of the co-current air hood (2) and the counter-current air hood (3) are all covered with high-temperature resistant sealing gaskets.

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