Anti-blocking device for flue gas sampling and method of use

Abstract

The present application relates to the technical field of flue gas sampling equipment, and discloses a kind of anti-blocking device for flue gas sampling and use method, anti-blocking device includes being arranged in the flue gas outlet of boiler chimney and flue gas sampling component;The side of the boiler chimney is provided with flue gas outlet, and the flue gas outlet is provided with flue gas sampling component;The end of the flue gas communication pipe extends into the boiler chimney, the bottom side of one end of the flue gas communication pipe is provided with smoke inlet, another end of the flue gas communication pipe is communicated with sampling connecting pipe, the end of the sampling connecting pipe away from the flue gas communication pipe is provided with closed connecting cover, and the end of the transmission connecting rod away from the closed connecting cover is provided with flue gas filter screen.The present application filters flue gas before sampling by flue gas connecting pipe combined with flue gas filter screen, and sets up cleaning scraper, by detachable end cover and external motor, the flue gas filter screen can be cleaned on line or quickly replaced after long-term use.

Description

Technical Field

[0001] This invention relates to the field of flue gas sampling equipment technology, specifically to an anti-clogging device and its usage method for flue gas sampling. Background Technology

[0002] In the operation of thermal equipment such as industrial boilers, waste incinerators, and industrial kilns, flue gas sampling and analysis is a core means of monitoring combustion efficiency, pollutant emission concentrations, and equipment operational stability. The accuracy of the sampling data directly determines the reliability of environmental compliance determination, combustion condition adjustment, and equipment fault diagnosis. However, flue gas contains a large amount of fly ash dust and acidic components (such as SO2 and NO). X Impurities such as viscous particles and water vapor can easily cause blockages in sampling pipelines, probes, and filter components, becoming a key bottleneck restricting the long-term stable operation of flue gas sampling systems.

[0003] Chinese patent CN219784133U discloses an anti-clogging device for flue gas sampling. This device separates the sampling and backflushing channels through a backflushing interface designed on the surface of the sampling sleeve. The backflushing interface laterally blows the surface of the filter element, thus preventing dust emissions from being obstructed by the filter element during backflushing dust removal. However, the flue gas sampling device in the aforementioned patent still has certain shortcomings: although existing flue gas sampling devices have filters in the sampling tube to prevent large particles in the flue gas from entering the sampling instrument and causing blockage, the filter surface can still experience poor flue gas permeability due to the accumulation of dust particles over a long period of filtration, affecting the user's actual sampling effect. Summary of the Invention

[0004] To address existing problems, this invention provides an anti-clogging device and method for flue gas sampling. The device filters flue gas before sampling via a flue gas connecting pipe and a flue gas filter. A cleaning scraper is installed on the filter. Through a detachable end cap and an external motor, the filter, which accumulates dust and grime over long-term use, can be cleaned online or quickly replaced. This solves the problems of poor flue gas permeability and severe measurement distortion in existing flue gas sampling technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] The present invention provides an anti-clogging device for flue gas sampling, including a flue gas outlet and a flue gas sampling component disposed on a boiler chimney; the flue gas outlet is disposed on the side of the boiler chimney, and the flue gas sampling component is disposed on the flue gas outlet; The flue gas sampling assembly includes a flue gas connecting pipe, a sampling connecting pipe, a closed connecting cover, connecting bolts, a transmission connecting rod, and a flue gas filter screen; The flue gas sampling assembly includes a flue gas connecting pipe inserted into the flue gas outlet, with one end of the flue gas connecting pipe extending into the boiler chimney. A flue gas inlet is provided on the bottom side of one end of the flue gas connecting pipe, and a sampling connecting pipe is connected to the other end of the flue gas connecting pipe. A closed connecting cover is provided at the end of the sampling connecting pipe away from the flue gas connecting pipe. The closed connecting cover is connected to the sampling connecting pipe by a plurality of evenly arranged connecting bolts. A transmission connecting rod is rotatably provided in the middle of the closed connecting cover via a bearing, and a flue gas filter screen is provided at the end of the transmission connecting rod away from the closed connecting cover.

[0007] As a further improvement of the present invention, it also includes a connecting bearing, an end connecting block, a cleaning scraper, and a drive motor; the middle part of the flue gas filter is connected to the end of the transmission connecting rod through the connecting bearing, the end of the transmission connecting rod is fixed with an end connecting block, two cleaning scrapers are symmetrically arranged on both sides of the end connecting block, a drive motor is arranged on the outer side of the closed connecting cover, and the drive shaft of the drive motor is fixedly connected to the end of the transmission connecting rod.

[0008] As a further improvement of the present invention, the sidewall of the cleaning scraper is inclined and the sidewall of the cleaning scraper is in contact with the surface of the flue gas filter.

[0009] As a further improvement of the present invention, a bottom exhaust pipe is also included; a bottom exhaust pipe is provided on the bottom side of the end of the sampling connection pipe.

[0010] As a further improvement of the present invention, it also includes an impurity discharge tube; the bottom side of the sampling connection tube is connected to the impurity discharge tube.

[0011] As a further improvement of the present invention, a number of protrusions are evenly arranged around the inner wall of the sampling connection tube.

[0012] As a further improvement of the present invention, the connection between the impurity discharge pipe and the sampling connection pipe is located at the bottom of one side of the flue gas filter.

[0013] As a further improvement of the present invention, a valve is also included; the impurity discharge pipe is provided with a valve.

[0014] As a further improvement of the present invention, a flue gas sampler is provided on the top side of the sampling connection pipe, and the flue gas sampler is connected to the sampling connection pipe through a flue gas inlet connection pipe.

[0015] The present invention also provides a method of using an anti-clogging device for flue gas sampling, comprising the following steps: Insert the flue gas connecting pipe into the flue gas outlet on the side of the boiler chimney, so that the end of the flue gas connecting pipe extends into the boiler chimney. As the flue gas flows through the sampling connection pipe, impurities in the flue gas are filtered by the flue gas filter screen. During the sampling process, the drive motor is started, which drives the transmission connecting rod to rotate. The transmission connecting rod drives the end connecting block to rotate, which in turn drives the cleaning scraper to rotate. Since the side wall of the cleaning scraper is inclined and fits against the surface of the flue gas filter, the cleaning scraper cleans the surface of the flue gas filter to prevent the flue gas filter from clogging. If an impurity discharge pipe and valve are installed, when impurities accumulate in the sampling connection pipe, the valve on the impurity discharge pipe is opened, and the impurities are discharged through the impurity discharge pipe; if a bottom exhaust pipe is installed, when the flue gas pressure in the boiler chimney is high, the flue gas can be discharged through the bottom exhaust pipe at the bottom side of the end of the sampling connection pipe to relieve pressure.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This device constructs a complete flue gas sampling path by setting up structures such as flue gas connecting pipes and sampling connecting pipes, which can draw out the flue gas in the boiler chimney for sampling; at the same time, the flue gas filter screen can preliminarily filter impurities in the flue gas during the sampling process, reducing the number of impurities entering the subsequent sampling stage, playing a certain role in preventing blockage, and ensuring a relatively smooth sampling process.

[0017] Preferably, the design incorporates components such as a connecting bearing, an end connecting block, a cleaning scraper, and a drive motor. The drive motor rotates the transmission connecting rod, causing the cleaning scraper to rotate on the surface of the flue gas filter. This effectively removes accumulated impurities from the filter, preventing clogging and ensuring continuous and smooth passage of flue gas for sampling. This improves the reliability and stability of the anti-clogging device. This design addresses the problem in existing flue gas sampling devices where, although filters prevent large particles from entering the sampling instrument and causing clogging, prolonged use can lead to poor flue gas permeability due to particle accumulation, affecting the user's sampling results.

[0018] Preferably, the sidewall of the cleaning scraper is inclined and fits in close contact with the surface of the flue gas filter. This design allows the cleaning scraper to make better contact with the surface of the flue gas filter under the drive of the transmission connecting rod, more effectively scraping off large flue gas particles from the surface of the flue gas filter, further enhancing the cleaning effect and improving the anti-clogging ability.

[0019] Preferably, the bottom exhaust pipe provides an exhaust channel for any excess flue gas or gas that may be present in the sampling connection pipe, preventing abnormal pressure inside the pipe due to gas accumulation, which could affect the normal operation of the flue gas sampling and anti-blocking device, and ensuring smooth gas flow inside the device.

[0020] Preferably, the impurity discharge pipe is designed so that impurities filtered by the flue gas filter can be smoothly discharged from the sampling connection pipe, preventing impurities from accumulating inside the pipe and causing blockage.

[0021] Preferably, several protrusions are evenly arranged around the inner wall of the sampling connecting pipe. The protrusions can limit the position of the flue gas filter screen along the pipe wall direction. During use, the protrusions prevent the flue gas filter screen from falling into the flue gas connecting pipe. When replacing, simply remove the closed connecting cover and take out the flue gas filter screen to replace it with a new one.

[0022] Preferably, the connection between the impurity discharge pipe and the sampling connection pipe is located at the bottom of the flue gas filter screen. This design allows particles adhering to the flue gas filter screen to fall into the top opening of the impurity discharge pipe through the scraping of the cleaning scraper, facilitating the smooth discharge of impurities and preventing impurities from accumulating in other locations inside the sampling connection pipe, thus effectively preventing blockage.

[0023] Preferably, the valve is installed on the impurity discharge pipe, which can control the discharge time and flow rate of impurities. The valve is opened when impurities need to be cleaned, allowing them to be discharged; the valve is closed when cleaning is not required or during normal sampling, preventing flue gas from leaking from the impurity discharge pipe, ensuring the accuracy of the sampling process and the sealing of the device, and also facilitating flexible management of the impurity discharge process.

[0024] Preferably, a flue gas sampler is installed on the top side of the sampling connection pipe and is connected to the sampling connection pipe through the flue gas inlet connection pipe, which facilitates the acquisition of filtered flue gas samples from the sampling connection pipe, making the flue gas sampling operation more convenient and standardized, and ensuring the smooth progress of the sampling work.

[0025] This method clarifies the installation location and method of the flue gas connecting pipe, ensuring that the flue gas inside the boiler chimney can be drawn out. It also points out that impurities should be filtered using a flue gas filter screen during the flue gas flow process. This is a key step for the entire anti-clogging device to achieve its anti-clogging function. This method can effectively utilize the anti-clogging device to sample flue gas and prevent blockage, ensuring the normal operation of the sampling work. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a three-dimensional schematic diagram of an anti-clogging device for flue gas sampling in Example 1; Figure 2 This is a schematic diagram of the flue gas sampling assembly in Example 1; Figure 3 This is a cross-sectional view of the flue gas sampling assembly in Example 1; Figure 4 This is an enlarged view of the protrusion structure in Example 3.

[0027] The components are as follows: 1. Boiler chimney; 2. Exhaust outlet; 3. Flue gas sampling assembly; 301. Flue gas connecting pipe; 302. Smoke inlet opening; 303. Sampling connecting pipe; 304. Closing connecting cover; 305. Connecting bolt; 306. Transmission connecting rod; 307. Flue gas filter screen; 308. Connecting bearing; 309. End connecting block; 310. Cleaning scraper; 311. Drive motor; 312. Bottom exhaust pipe; 313. Flue gas sampler; 314. Smoke inlet connecting pipe; 315. Impurity discharge pipe; 316. Valve; 317. Fixed connecting rod; 318. Protrusion. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1 like Figure 1 As shown, this embodiment provides an anti-clogging device for flue gas sampling, including a flue gas outlet 2 and a flue gas sampling component 3 disposed on a boiler chimney 1; the flue gas outlet 2 is disposed on the side of the boiler chimney 1, and the flue gas sampling component 3 is disposed on the flue gas outlet 2.

[0032] like Figure 2 and 3As shown, the flue gas sampling assembly 3 includes a flue gas connecting pipe 301, a sampling connecting pipe 303, a closing connecting cover 304, a connecting bolt 305, a transmission connecting rod 306, a flue gas filter screen 307, a connecting bearing 308, an end connecting block 309, a cleaning scraper 310, and a drive motor 311.

[0033] The flue gas sampling assembly 3 includes a flue gas connecting pipe 301 inserted into the flue gas outlet 2. The end of the flue gas connecting pipe 301 extends into the boiler chimney 1. A flue gas inlet opening 302 is provided on the bottom side of one end of the flue gas connecting pipe 301. The other end of the flue gas connecting pipe 301 is connected to a sampling connecting pipe 303. A closed connecting cover 304 is provided at the end of the sampling connecting pipe 303 away from the flue gas connecting pipe 301. The closed connecting cover 304 and the sampling connecting pipe 303 are connected by a plurality of evenly arranged connecting bolts 305. A transmission connecting rod 306 is rotatably provided in the middle of the closed connecting cover 304 through a bearing. A flue gas filter screen 307 is provided at the end of the transmission connecting rod 306 away from the closed connecting cover 304.

[0034] The middle part of the flue gas filter screen 307 is connected to the end of the transmission connecting rod 306 through the connecting bearing 308. The end of the transmission connecting rod 306 is fixed with an end connecting block 309. Two cleaning scrapers 310 are symmetrically arranged on both sides of the end connecting block 309. A drive motor 311 is arranged on the outside of the closed connecting cover 304. The drive shaft of the drive motor 311 is fixedly connected to the end of the transmission connecting rod 306.

[0035] A bottom exhaust pipe 312 is provided on the bottom side of the end of the sampling connection pipe 303.

[0036] like Figure 2 and 3 As shown, the bottom side of the sampling connection tube 303 is connected to the impurity discharge tube 315.

[0037] The side of the flue gas filter 307 is fixedly connected to the closed connecting cover 304 via two symmetrically arranged fixed connecting rods 317. The fixed connecting rods fix the flue gas filter to the closed connecting cover, which enhances the stability of the flue gas filter and ensures that it will not shake or shift due to airflow impact or other factors during operation, thus affecting the filtration and anti-clogging effect.

[0038] The connection point between the impurity discharge pipe 315 and the sampling connection pipe 303 is located at the bottom of one side of the flue gas filter screen 307.

[0039] like Figure 2 and 3 As shown, a valve 316 is installed on the impurity discharge pipe 315.

[0040] A flue gas sampler 313 is provided on the top side of the sampling connection pipe 303, and the flue gas sampler 313 is connected to the sampling connection pipe 303 through a flue gas inlet connection pipe 314.

[0041] Compared with the prior art, this embodiment provides an anti-clogging device for flue gas sampling, which has the following beneficial effects: This embodiment provides a flue gas sampling assembly on the side of the boiler chimney, wherein the flue gas connecting pipe in the flue gas sampling assembly is inserted into the exhaust port and extends into the boiler chimney, so that the flue gas in the boiler chimney can enter the flue gas connecting pipe and the sampling connecting pipe through the flue gas inlet. The flue gas flowing through the sampling connecting pipe is filtered by the flue gas filter screen, which removes large particles of impurities that do not meet the sampling standards. The flue gas passing through the flue gas filter screen enters the flue gas sampler through the flue gas inlet connecting pipe for sampling and collection. The impurities on the surface of the flue gas filter screen can be cleaned by the drive motor driving the cleaning scraper, thereby ensuring the long-term safe use of the sampling device, avoiding the clogging of the filter screen holes and making sampling difficult, and facilitating the user's sampling operation.

[0042] This embodiment also provides a method for using an anti-clogging device for flue gas sampling, including the following steps: Insert the flue gas connecting pipe 301 into the flue gas outlet 2 on the side of the boiler chimney 1, so that the end of the flue gas connecting pipe 301 extends into the boiler chimney 1. As the flue gas flows through the sampling connection pipe 303, impurities in the flue gas are filtered by the flue gas filter screen 307. During the sampling process, the drive motor 311 is started, which drives the transmission connecting rod 306 to rotate. The transmission connecting rod 306 drives the end connecting block 309 to rotate, which in turn drives the cleaning scraper 310 to rotate. Since the side wall of the cleaning scraper 310 is inclined and fits against the surface of the flue gas filter 307, the cleaning scraper 310 cleans the surface of the flue gas filter 307 to prevent the flue gas filter 307 from becoming clogged. When impurities accumulate in the sampling connection pipe 303, the valve 316 on the impurity discharge pipe 315 is opened, and the impurities are discharged through the impurity discharge pipe 315. When the flue gas pressure in the boiler chimney 1 is high, the flue gas can be discharged through the bottom exhaust pipe 312 at the bottom side of the end of the sampling connection pipe 303 to relieve pressure.

[0043] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The side wall of the cleaning scraper 310 is inclined and the side wall of the cleaning scraper 310 is in contact with the surface of the flue gas filter 307.

[0044] The cleaning scraper has an inclined sidewall that fits snugly against the surface of the flue gas filter. This design allows the cleaning scraper to make better contact with the surface of the flue gas filter under the drive of the transmission connecting rod, more effectively scraping away large flue gas particles from the surface of the flue gas filter, further enhancing the cleaning effect and improving the anti-clogging ability.

[0045] In practice, when a user needs to sample the flue gas flowing in the boiler chimney 1, the user first inserts the flue gas connecting pipe 301 in the flue gas sampling assembly 3 into the flue gas outlet 2, extending it into the boiler chimney 1, with the bottom side of the flue gas inlet 302 facing downwards, so that part of the flue gas in the boiler chimney 1 enters the flue gas connecting pipe 301 and then enters the sampling connecting pipe 303 through the flue gas connecting pipe 301.

[0046] During sampling, to prevent impurities from clogging the bottom of the flue gas sampler 313, and since the flue gas sampler 313 is an existing product, such as the testo 3008 Pro dust sampler, a flue gas filter 307 is installed in the sampling connection pipe 303. This allows large particulate impurities in the flue gas to be partially filtered through the flue gas filter 307, so that the flue gas that meets the sampling requirements can enter the flue gas sampler 313 through the smoke inlet connection pipe 314 and be collected and sampled, while the excess flue gas is discharged through the bottom exhaust pipe 312.

[0047] During long-term filtration, the surface of the flue gas filter 307 will inevitably accumulate certain impurities. By starting the drive motor 311, the drive motor 311 drives the cleaning scraper 310 on the surface of the flue gas filter 307 to rotate via the transmission connecting rod 306. The cleaning scraper 310 scrapes and removes the impurities from the surface of the flue gas filter 307. The removed particulate impurities are then discharged through the impurity discharge pipe 315, thus effectively ensuring the filtration performance of the flue gas filter 307 and preventing clogging. This also makes it more convenient for users to continuously sample.

[0048] Example 3 The difference between this embodiment and Embodiment 1 is that: 1) Several protrusions 318 are evenly arranged around the inner wall of the sampling connection tube 303.

[0049] like Figure 4 As shown, four protrusions 318 are evenly arranged around the inner wall of the sampling connection pipe 303. The function of the protrusions 318 is to limit the flue gas filter 307 along the pipe wall direction. During use, the protrusions 318 prevent the flue gas filter 307 from falling into the flue gas connecting pipe 301. When replacing, simply remove the closed connection cover 304 and take out the flue gas filter 307 to replace it with a new one.

[0050] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A device for preventing blockage in flue gas sampling, characterized in that, It includes a flue gas outlet (2) and a flue gas sampling assembly (3) installed on the boiler chimney (1); the side of the boiler chimney (1) is provided with a flue gas outlet (2), and the flue gas sampling assembly (3) is installed on the flue gas outlet (2). The flue gas sampling assembly (3) includes a flue gas connecting pipe (301), a sampling connecting pipe (303), a closing connecting cover (304), a connecting bolt (305), a transmission connecting rod (306), and a flue gas filter (307). The flue gas sampling assembly (3) includes a flue gas connecting pipe (301) inserted into the flue gas outlet (2). The end of the flue gas connecting pipe (301) extends into the boiler chimney (1). A flue gas inlet opening (302) is provided on the bottom side of one end of the flue gas connecting pipe (301). A sampling connecting pipe (303) is connected to the other end of the flue gas connecting pipe (301). A closed connecting cover (304) is provided at the end of the sampling connecting pipe (303) away from the flue gas connecting pipe (301). The closed connecting cover (304) and the sampling connecting pipe (303) are connected by a plurality of evenly arranged connecting bolts (305). A transmission connecting rod (306) is rotatably provided in the middle of the closed connecting cover (304) through a bearing. A flue gas filter screen (307) is provided at the end of the transmission connecting rod (306) away from the closed connecting cover (304).

2. The anti-clogging device for flue gas sampling according to claim 1, characterized in that, It also includes a connecting bearing (308), an end connecting block (309), a cleaning scraper (310), and a drive motor (311); the middle part of the flue gas filter (307) is connected to the end of the transmission connecting rod (306) through the connecting bearing (308), the end of the transmission connecting rod (306) is fixed with an end connecting block (309), two cleaning scrapers (310) are symmetrically arranged on both sides of the end connecting block (309), and a drive motor (311) is arranged on the outside of the closed connecting cover (304), and the drive shaft of the drive motor (311) is fixedly connected to the end of the transmission connecting rod (306).

3. The anti-clogging device for flue gas sampling according to claim 2, characterized in that, The sidewall of the cleaning scraper (310) is inclined and is in contact with the surface of the flue gas filter (307).

4. The anti-clogging device for flue gas sampling according to claim 1, characterized in that, It also includes a bottom exhaust pipe (312); the bottom side of the sampling connection pipe (303) is provided with a bottom exhaust pipe (312).

5. The anti-clogging device for flue gas sampling according to claim 1, characterized in that, It also includes an impurity discharge pipe (315); the bottom side of the sampling connection pipe (303) is connected to the impurity discharge pipe (315).

6. The anti-clogging device for flue gas sampling according to claim 5, characterized in that, The sampling connection tube (303) has several protrusions (318) evenly arranged around its inner wall.

7. The anti-clogging device for flue gas sampling according to claim 5, characterized in that, The connection between the impurity discharge pipe (315) and the sampling connection pipe (303) is located at the bottom of one side of the flue gas filter (307).

8. The anti-clogging device for flue gas sampling according to claim 5, characterized in that, It also includes a valve (316); the impurity discharge pipe (315) is provided with a valve (316).

9. The anti-clogging device for flue gas sampling according to claim 1, characterized in that, A flue gas sampler (313) is provided on the top side of the sampling connection pipe (303), and the flue gas sampler (313) and the sampling connection pipe (303) are connected by a flue gas inlet connection pipe (314).

10. The method of using the anti-clogging device for flue gas sampling as described in any one of claims 2 to 9, characterized in that, Includes the following steps: Insert the flue gas connecting pipe (301) into the flue gas outlet (2) on the side of the boiler chimney (1), so that the end of the flue gas connecting pipe (301) extends into the boiler chimney (1); During the flow of flue gas in the sampling connection pipe (303), impurities in the flue gas are filtered by the flue gas filter screen (307); During the sampling process, the drive motor (311) is started, and the drive motor (311) drives the transmission connecting rod (306) to rotate. The transmission connecting rod (306) drives the end connecting block (309) to rotate, which in turn drives the cleaning scraper (310) to rotate. Since the side wall of the cleaning scraper (310) is inclined and is in contact with the surface of the flue gas filter (307), the cleaning scraper (310) cleans the surface of the flue gas filter (307) to prevent the flue gas filter (307) from clogging. If an impurity discharge pipe (315) and a valve (316) are installed, when impurities accumulate in the sampling connection pipe (303), the valve (316) on the impurity discharge pipe (315) is opened, and the impurities are discharged through the impurity discharge pipe (315); if a bottom exhaust pipe (312) is installed, when the flue gas pressure in the boiler chimney (1) is high, the flue gas can be discharged through the bottom exhaust pipe (312) at the bottom side of the end of the sampling connection pipe (303) to relieve pressure.

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