A smoke sampling device for coal-fired power plants

Abstract

The present application relates to the technical field of smoke sampling, and discloses a smoke sampling device for coal-fired power plants, which comprises a pipe group arranged between filter screens of a multi-stage filtering system, wherein the pipe group comprises an inclined smoke inlet pipe and an inclined smoke outlet pipe which are in communication with a waste gas filtering pipe, the inclined smoke inlet pipe and the inclined smoke outlet pipe are connected through a collecting pipe to form a detection flue gas branch, a collecting assembly for filtering and sampling smoke in the detection flue gas branch is detachably connected to the collecting pipe, and a collecting assembly for collecting sampled smoke dust for detection and storage is arranged at the bottom of the collecting assembly; the smoke dust is collected in the elastic filter screen, and the collecting assembly and the collecting assembly are cooperatively matched, so that when an operator has a detection requirement, the smoke dust collecting cup is directly connected to the collecting test bottle for sampling, a smoke dust sample is obtained, and the subsequent smoke dust research and smoke dust storage are facilitated, and the sampling device can realize collection, sampling, cleaning, active detection and re-inspection.

Description

Technical Field

[0001] This invention relates to the field of flue gas sampling technology, specifically a flue gas sampling device for coal-fired power plants. Background Technology

[0002] The exhaust gas produced during coal combustion needs to be filtered to meet emission regulations. A large amount of soot is mainly captured by the filter screen at the front end of the flue gas filtration system. Because the filter screen is easily saturated, the front-end filtration often adopts a progressive filtration method of primary, medium and high efficiency to block large, medium and small particles respectively and reduce the saturation rate. For coal-fired power generation, coal combustion is continuous. In order to ensure the high efficiency and stability of the front-end filtration, it is necessary to collect soot at each stage of the front-end filtration. By collecting and analyzing soot particles, it is possible to determine whether the fuel meets the specifications, whether the filtration is stable, whether there are other special substances, and at the same time, monitor the flue gas conditions.

[0003] Currently, the most commonly used flue gas samplers primarily use a detection probe and processor to process flue gas data and obtain information on impurities within the flue gas. This method involves setting up sampling ports on the filter assembly, inserting the probe, and capturing the passing flue gas. While primarily used for spot checks, this approach is insufficient for continuous monitoring of flue gas over a specific time period. Furthermore, it only acquires electronic data and cannot collect flue gas particles, resulting in insufficient traceability. The purpose of flue gas collection is to detect the morphology, composition, and quality of flue gas particles. Sealing the flue gas sample also facilitates subsequent traceability and management within the power plant. During collection, since flue gas filtration is divided into primary, intermediate, and high-efficiency filters, collecting the same amount of flue gas particles from the high-efficiency filter takes longer than from the primary filter. Therefore, a specialized flue gas sampling device is needed that is easy to use and allows for continuous flue gas collection to meet the power plant's monitoring requirements for clean gas equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a dust sampling device for coal-fired power plants to solve the problems mentioned in the background art.

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

[0006] A flue gas sampling device for a coal-fired power plant includes a pipe assembly disposed between the filter screens of a multi-stage filtration system.

[0007] The pipe assembly includes an inclined smoke inlet pipe and an inclined smoke outlet pipe connected to the exhaust gas filtration pipe. The inclined smoke inlet pipe and the inclined smoke outlet pipe are connected through a collection pipe to form a detection flue gas branch. A collection component for sampling the flue gas in the detection flue gas branch is detachably connected inside the collection pipe. The bottom of the collection component is provided with a collection component for collecting the sampled flue dust for detection and storage.

[0008] The collection component includes an outer ventilation connection pipe, an elastic inner filter screen, and a smoke and dust collection cup. The collection component is installed at the smoke and dust collection cup, and the elastic inner filter screen is attached to the supporting mesh cage.

[0009] The collection assembly includes a control sleeve slidably connected to the dust collection cup and several take-up ratchet groups. The take-up ratchet groups are distributed in a ring on the inner wall of the outer ventilation connection pipe. A vibrating traction rope is wound inside the take-up ratchet groups. The vibrating traction rope is fixedly connected to the elastic inner filter screen. A control rack is slidably connected inside the outer ventilation connection pipe. Several racks that cooperate with the take-up ratchet groups are fixedly connected at equal intervals on the control rack. The take-up ratchet groups are elastically connected to the outer ventilation connection pipe through a torsion spring. The control sleeve controls the sliding of the control rack through the control traction rope.

[0010] As a further embodiment of the present invention: a disassembly groove is provided at the bottom of the collecting pipe, and a mounting sealing plate is detachably connected in the disassembly groove; the inclined exhaust pipe is located on one side of the bottom end of the collecting pipe; the inclined inlet pipe is located directly above the collecting pipe; the bottom end of the inclined inlet pipe extends into the interior of the collecting pipe; the outer ventilation connecting pipe is detachably connected to the bottom end of the inclined inlet pipe; and the top of the outer ventilation connecting pipe is provided with a threaded fixing part that is screwed into the inclined inlet pipe.

[0011] As a further embodiment of the present invention: the upper and lower ends of the elastic inner filter are both open structures, the dust collection cup and the outer ventilation connection pipe are fixedly connected by multiple support rods, the bottom open end of the elastic inner filter is fixedly connected to the dust collection cup to form a closed end, the top open end of the elastic inner filter is fixedly connected to the lower part of the threaded fixing part, and the elastic inner filter and the inclined smoke inlet pipe form a gas passage.

[0012] As a further embodiment of the present invention: the diameters of the elastic inner filter and the supporting mesh cage are both smaller than the diameter of the outer ventilation connecting pipe, and the outer ventilation connecting pipe and the elastic inner filter form a stretching cavity of the elastic inner filter and a clean gas flow cavity.

[0013] As a further embodiment of the present invention: the control sleeve is slidably connected to the lower end of the dust collection cup, the dust collection cup has an inlet hole, the control traction rope is slidably connected to the inside of the inlet hole, the outer ventilation connection pipe has a control cavity, the control traction rope extends into the inside of the control cavity, the control gear is vertically slidably connected to the inside of the control cavity, and a guide rod is fixedly connected to the top surface of the inner wall of the control cavity. The guide rod is elastically slidably connected to the control gear through a tension spring.

[0014] As a further embodiment of the present invention: a clean air filter pipe is provided on the inclined smoke inlet pipe, and a flue gas inspection pipe is provided at the bottom of the inclined smoke exhaust pipe. The clean air filter pipe is connected to the inclined smoke inlet pipe, and the flue gas inspection pipe is connected to the inclined smoke exhaust pipe. Each of the inclined smoke inlet pipe, the inclined smoke exhaust pipe, the clean air filter pipe, the flue gas inspection pipe, and the dust collection cup is equipped with an independently controlled valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This device employs an internal dust collection method using an elastic filter screen. A flue gas detection and collection pipeline is installed on the side of the filter pipe to continuously collect dust. Utilizing the coordinated operation of the collection and acquisition components, the operator can open the flue gas detection and collection pipeline for a period of time and then close it when needed. This elastically shakes the inner filter screen, collecting the dust directly through a dust collection cup connected to a sample bottle. This provides convenience for subsequent dust research and storage. Furthermore, this sampling device can complete collection, acquisition, cleaning, active detection, and re-inspection, reducing the influence of sampling components during sampling. This equipment is more suitable for continuous waste gas treatment in coal-fired power plants. Dust collection reflects the operational status of the waste gas treatment process, allowing for on-demand collection and more convenient operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional cross-sectional schematic diagram of a flue gas sampling device for a coal-fired power plant;

[0019] Figure 2 This is a schematic diagram of flue gas sampling and sample collection using a flue gas sampling device for coal-fired power plants.

[0020] Figure 3 This is a schematic diagram of the filtered flue gas detection and cleaning process in a flue gas sampling device used in a coal-fired power plant.

[0021] Figure 4 A schematic diagram illustrating the replacement and disassembly of a flue gas sampling device used in a coal-fired power plant;

[0022] Figure 5 This is a schematic cross-sectional view of the sampling component in a dust sampling device for a coal-fired power plant.

[0023] In the diagram: 1. Pipe assembly; 11. Inclined smoke inlet pipe; 12. Inclined smoke exhaust pipe; 13. Collection pipe; 131. Disassembly slot; 132. Installation sealing plate; 14. Clean air filter pipe; 15. Flue gas test pipe; 16. Support cage; 2. Collection assembly; 21. External ventilation connection pipe; 211. Threaded fixing part; 212. Control chamber; 22. Elastic inner filter screen; 23. Smoke and dust collection cup; 231. Inlet hole; 3. Collection assembly; 31. Control sleeve rod; 32. Control traction rope; 33. Control rack; 34. Rack; 35. Retracting ratchet assembly; 351. Torsion spring; 36. Vibration traction rope; 37. Guide rod; 38. Tension spring. Detailed Implementation

[0024] Please see Figures 1-5 :

[0025] This includes pipe assembly 1, which is installed between the filter screens of the multi-stage filtration system;

[0026] Firstly, the front end of the exhaust gas treatment pipeline is the filter assembly, which is divided into pre-filter, medium-efficiency filter, and high-efficiency filter. Pipe group 1 is mainly located between the pre-filter and medium-efficiency filter, as well as between the medium-efficiency filter and the high-efficiency filter. If the filtration mechanism is more complex, the number of pipe groups 1 can be increased as needed.

[0027] The pipe assembly 1 includes an inclined smoke inlet pipe 11 and an inclined smoke outlet pipe 12 connected to the exhaust gas filtration pipe. The inclined smoke inlet pipe 11 and the inclined smoke outlet pipe 12 are connected through a collection pipe 13 to form a detection flue gas branch. A collection component 2 for sampling the flue gas in the detection flue gas branch is detachably connected inside the collection pipe 13. A collection component 3 is provided at the bottom of the collection component 2 to collect the sampled flue dust for detection and storage.

[0028] Please see Figure 1 , Figure 1The flue gas direction is from top to bottom. The filter pipeline can be fixed by disassembling and connecting the inclined inlet pipe 11 and the inclined exhaust pipe 12, or the pipeline can be replaced. The inclined inlet pipe 11 and the inclined exhaust pipe 12 are integrally formed, and the entire filter system is directly installed in the pipeline. It is used by disassembling and installing as a whole. At this time, the inclined inlet pipe 11 extends into the filter pipeline, and the opening of the inclined inlet pipe 11 faces the direction of the flue gas. The flue gas can be affected by the gas flow direction and directly enter the inclined inlet pipe 11. At this time, the flue gas flows back into the pipeline through the collection pipe 13 and the inclined exhaust pipe 12. To prevent flue gas from flowing back through the inclined exhaust pipe 12, a one-way valve can be installed at the inclined exhaust pipe 12, and a fan can be installed inside the inclined exhaust pipe 12. By increasing the air pressure inside the inclined exhaust pipe 12, the gas is forced into the filter pipe through the inclined exhaust pipe 12 in conjunction with the one-way valve. At this time, the gas will pass through the collection component 2, and the particles will be captured by the collection component 2 after passing through it. The collection component 3 will then collect the dust sample.

[0029] The collection component 2 includes an outer ventilation connection pipe 21, an elastic inner filter 22, and a dust collection cup 23. The collection component 3 is set at the dust collection cup 23, and the elastic inner filter 22 is attached to the support cage 16.

[0030] Firstly, a support cage 16 is installed inside the pipe assembly 1. The elastic inner filter 22 itself is elastic, and the outer ventilation connection pipe 21 is fixed to the elastic inner filter 22. During installation, the outer ventilation connection pipe 21 provides rigid support for the elastic inner filter 22, allowing the outer ventilation connection pipe 21 to be directly inserted into the collection pipe 13, so that the elastic inner filter 22 is wrapped around the outside of the support cage 16. At the same time, the outer ventilation connection pipe 21 also provides installation space for the subsequent collection assembly 3. At this time, the dust collection cup 23 is located below the outer ventilation connection pipe 21. The diameter of the dust collection cup 23 is smaller than that of the outer ventilation connection pipe 21. The outer ventilation connection pipe 21 and the dust collection cup 23 are fixed by multiple ring-shaped support rods, which ensures airflow in the cavity between the outer ventilation connection pipe 21 and the elastic inner filter 22.

[0031] The collection component 3 includes a control rod 31 slidably connected to the dust collection cup 23 and several take-up ratchet groups 35. The take-up ratchet groups 35 are distributed in a ring on the inner wall of the outer ventilation connection pipe 21. A vibrating traction rope 36 is wound inside the take-up ratchet groups 35. The vibrating traction rope 36 is fixedly connected to the elastic inner filter screen 22. A control rack 33 is slidably connected inside the outer ventilation connection pipe 21. Several racks 34 that cooperate with the take-up ratchet groups 35 are fixedly connected at equal intervals on the control rack 33. The take-up ratchet groups 35 are elastically connected to the outer ventilation connection pipe 21 through a torsion spring 351. The control rod 31 controls the sliding of the control rack 33 through the control traction rope 32.

[0032] Firstly, for ease of use, the inclined exhaust pipe 12 is positioned on the side of the collection pipe 13, leaving the bottom of the collection pipe 13 open. At this point, the bottom of the dust collection cup 23 extends to the outside of the bottom of the collection pipe 13. The control lever 31 can then be positioned outside the collection pipe 13, allowing the operator to control the extraction of dust using the external control lever 31. During control, the control lever 31 slides up and down, which in turn drives the control rack 33 to move up and down via the control traction rope 32. Because the racks 34 are evenly distributed, when the control rack 33 slides, the racks 34 will engage with the take-up ratchet assembly 35, causing the take-up ratchet assembly 35 to rotate. This drives the vibrating traction rope 36 to wind up, stretching the elastic inner filter screen 22 outward and causing elastic deformation until the racks 34 separate from the take-up ratchet assembly 35. This causes the take-up ratchet assembly 35 to disengage from its limit position, and the torsion spring 351 to release quickly. This causes the elastic inner filter screen 22 to deform rapidly and contact the support cage 16, shaking off the dust adhering to the inner wall of the elastic inner filter screen 22 into the dust collection cup 23 for collection. The entire device has a simpler structure, designed to make it easier for operators to use. The simple structure and stable mechanical structure make it suitable for factory applications and meet usage requirements.

[0033] The bottom of the collecting pipe 13 is provided with a disassembly groove 131, and a mounting sealing plate 132 is detachably connected in the disassembly groove 131. The inclined exhaust pipe 12 is located on one side of the bottom end of the collecting pipe 13, and the inclined smoke inlet pipe 11 is located directly above the collecting pipe 13. The bottom end of the inclined smoke inlet pipe 11 extends into the interior of the collecting pipe 13. The outer ventilation connection pipe 21 is detachably connected to the bottom end of the inclined smoke inlet pipe 11. The top of the outer ventilation connection pipe 21 is provided with a threaded fixing part 211 that is screwed into the inclined smoke inlet pipe 11.

[0034] Firstly, prolonged use can easily lead to filter failure of the elastic inner filter 22 and fatigue of the torsion spring 351, causing reset problems. In this case, the collection component 2 and the collecting component 3 need to be replaced. To facilitate replacement, a disassembly groove 131 and a mounting sealing plate 132 are provided at the bottom of the collecting pipe 13. Disassembly is performed by separating the mounting sealing plate 132 from the disassembly groove 131. If a valve is installed at the bottom of the dust collection cup 23, and if the valve is manual, the control rod extends to the outside, which can easily affect the fitting of the mounting sealing plate 132 and the dust collection cup 23. Therefore, the control rod of the valve at the dust collection cup 23 can be detachably connected to the valve plate. This only requires opening a hole in the extension rod of the mounting sealing plate 132. During use, the control rod is inserted through the control insertion valve plate connection port. For fixing, the outer ventilation connection pipe 21 is inserted through the disassembly groove 131 into the collecting pipe 13, and then screwed onto the inclined smoke inlet pipe 11 via the threaded fixing part 211, completing the fixation process conveniently.

[0035] The upper and lower ends of the elastic inner filter 22 are both open structures. The dust collection cup 23 and the outer ventilation connection pipe 21 are fixedly connected by multiple support rods. The bottom open end of the elastic inner filter 22 is fixed to the dust collection cup 23 to form a closed end. The top open end of the elastic inner filter 22 is fixedly connected to the lower part of the threaded fixing part 211. The elastic inner filter 22 and the inclined smoke inlet pipe 11 form a gas passage.

[0036] Firstly, the entire filtration system employs internal filtration, with the filter surface of the elastic inner filter 22 located inside. After the bottom of the elastic inner filter 22 is fixed to the dust collection cup 23, dust falls into the dust collection cup 23 when the elastic inner filter 22 is shaken down in conjunction with the supporting mesh cage 16. This is for subsequent dust collection. Meanwhile, the top of the elastic inner filter 22 is fixed below the threaded fixing part 211. The threaded fixing part 211, after being fixed to the inclined smoke inlet pipe 11, forms a sealed passage, allowing the flue gas to enter the interior of the elastic inner filter 22 only through the inclined smoke inlet pipe 11. The flue gas then enters the cavity between the elastic inner filter 22 and the outer ventilation connecting pipe 21 through the side of the elastic inner filter 22, and then flows back through the inclined exhaust pipe 12.

[0037] The diameters of the elastic inner filter 22 and the support cage 16 are both smaller than the diameter of the outer ventilation connection pipe 21. The outer ventilation connection pipe 21 and the elastic inner filter 22 form a stretching cavity of the elastic inner filter 22 and a clean gas flow cavity.

[0038] Firstly, the outer ventilation connecting pipe 21 serves a supporting function, while also providing space for the installation of the take-up ratchet assembly 35. The take-up ratchet assembly 35, in conjunction with the vibrating traction rope 36, stretches the elastic inner filter 22 outward, causing it to deform elastically. The purpose is to use the elasticity of the elastic inner filter 22 to shake off and collect dust. At the same time, the outer ventilation connecting pipe 21 also needs to serve a connecting purpose. Therefore, the diameters of the elastic inner filter 22 and the supporting cage 16 are both smaller than the diameter of the outer ventilation connecting pipe 21. This not only helps to stretch the elastic inner filter 22, but also allows air to circulate within the space between the elastic inner filter 22 and the outer ventilation connecting pipe 21, making it easier for air to flow into the inclined exhaust pipe 12.

[0039] The control sleeve 31 is slidably connected to the lower end of the dust collection cup 23. The dust collection cup 23 has an inlet hole 231. The control traction rope 32 is slidably connected inside the inlet hole 231. The outer ventilation connection pipe 21 has a control cavity 212. The control traction rope 32 extends into the control cavity 212. The control gear 33 is vertically slidably connected inside the control cavity 212. The top surface of the inner wall of the control cavity 212 is fixedly connected to the guide rod 37. The guide rod 37 is elastically slidably connected to the control gear 33 through a tension spring 38.

[0040] After the inlet hole 231 is opened in the dust collection cup 23, a rubber sealing layer can be set at the sliding point of the control sleeve 31 and the dust collection cup 23 to prevent subsequent gas escape. At this time, the control traction rope 32 can be slid within the inlet hole 231 by sliding the control sleeve 31. The control traction rope 32 extends into the control cavity 212 and is fixedly connected to the control gear 33. The top of the control gear 33 has a hole that slides with the guide rod 37. At this time, the bottom surface of the hole of the control gear 33 is fixed to the tension spring 38, and the other end of the tension spring 38 is fixed to the guide rod 37 to form an elastic connection. After the control sleeve 31 is released, the control gear 33 will elastically reset. Since a ratchet is set on the take-up ratchet assembly 35, the take-up ratchet assembly 35 will not be driven to rotate when the control gear 33 rises, so that the control gear 33 can be fully reset.

[0041] An air purification filter pipe 14 is installed on the inclined smoke inlet pipe 11, and a flue gas inspection pipe 15 is installed at the bottom of the inclined smoke exhaust pipe 12. The air purification filter pipe 14 is connected to the inclined smoke inlet pipe 11, and the flue gas inspection pipe 15 is connected to the inclined smoke exhaust pipe 12. The inclined smoke inlet pipe 11, the inclined smoke exhaust pipe 12, the air purification filter pipe 14, the flue gas inspection pipe 15, and the dust collection cup 23 are all equipped with independently controlled valves.

[0042] In summary, since dust sampling requires testing and storage, and continuous collection is necessary depending on sample quality, the main operational methods are as follows:

[0043] Collection phase

[0044] Open the valves at the inclined smoke inlet pipe 11 and the inclined smoke outlet pipe 12, and close the valves at the clean gas filter pipe 14, the flue gas test pipe 15, and the dust collection cup 23. At this time, the flue gas enters through the inclined smoke inlet pipe 11 and the clean gas after passing through the elastic inner filter screen 22 flows back to the flue gas filter pipe through the inclined smoke outlet pipe 12. After a period of time, the dust sample in the elastic inner filter screen 22 meets the collection requirements.

[0045] Collection phase

[0046] Based on the collection stage, the inclined smoke inlet pipe 11 and the inclined smoke outlet pipe 12 are closed. At this time, the dust collection component 2 is shaken by the collection component 3. The dust enters the interior of the dust collection cup 23. The valve at the dust collection cup 23 is opened, and a sample collection bottle is connected to the bottom of the dust collection cup 23 for sample collection.

[0047] Cleaning stage

[0048] To avoid cross-contamination of smoke and dust and improve the accuracy of smoke and dust collection, only the clean air filter tube 14 is turned on during the collection phase. At this time, the clean air filter tube 14 and the smoke and dust collection cup 23 form a passage. Clean gas is introduced through the clean air filter tube 14, and the operator shakes it off with the collection component 3 and the elastic inner filter 22. The dust is flushed out through the smoke and dust collection cup 23, and the dust on the inner wall material of the elastic inner filter 22 is removed to avoid residual smoke and dust from affecting subsequent smoke and dust collection.

[0049] Active detection phase

[0050] To improve the diversity of detection, on the basis of the cleaning stage, the dust collection cup 23 is closed, the inclined smoke inlet pipe 11 and the inclined smoke exhaust pipe 12 are opened, and the air sampler is inserted into the clean air filter pipe 14 so that the air condition before the smoke filtration during the dust collection process can be detected through the inclined smoke inlet pipe 11 and the inclined smoke exhaust pipe 12.

[0051] Re-inspection stage

[0052] Based on the active testing phase, the clean air filter tube 14 is closed, the flue gas test tube 15 is opened, and the flue gas test tube 15 is inserted into the air detector to detect the gas condition after the flue gas passes through the elastic inner filter 22, and to detect the filtration and collection effect of the elastic inner filter 22.

[0053] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dust sampling device for coal-fired power plants, characterized in that: Including pipe assemblies (1) installed between the filter screens of a multi-stage filtration system; The pipe assembly (1) includes an inclined smoke inlet pipe (11) and an inclined smoke outlet pipe (12) connected to the exhaust gas filtration pipe. The inclined smoke inlet pipe (11) and the inclined smoke outlet pipe (12) are connected through a collection pipe (13) to form a detection flue gas branch. A collection component (2) for sampling the flue gas filtration in the detection flue gas branch is detachably connected inside the collection pipe (13). A collection component (3) for collecting the sampled flue gas dust for detection and storage is provided at the bottom of the collection component (2). The collection component (2) includes an outer ventilation connection pipe (21), an elastic inner filter screen (22), and a dust collection cup (23). The collection component (3) is located at the dust collection cup (23), and the elastic inner filter screen (22) is attached to the support cage (16). The collection assembly (3) includes a control sleeve (31) slidably connected to the dust collection cup (23) and several take-up ratchet groups (35). The take-up ratchet groups (35) are distributed in a ring on the inner wall of the outer ventilation connection pipe (21). A vibration traction rope (36) is wound inside the take-up ratchet groups (35). The vibration traction rope (36) is fixedly connected to the elastic inner filter screen (22). A control rack (33) is slidably connected inside the outer ventilation connection pipe (21). Several racks (34) that cooperate with the take-up ratchet groups (35) are fixedly connected at equal intervals on the control rack (33). The take-up ratchet groups (35) are elastically connected to the outer ventilation connection pipe (21) through a torsion spring (351). The control sleeve (31) controls the sliding of the control rack (33) through the control traction rope (32). The control sleeve (31) is slidably connected to the lower end of the dust collection cup (23). The dust collection cup (23) has an inlet hole (231). The control traction rope (32) is slidably connected inside the inlet hole (231). The outer ventilation connection pipe (21) has a control cavity (212). The control traction rope (32) extends into the control cavity (212). The control gear (33) is vertically slidably connected inside the control cavity (212). A guide rod (37) is fixedly connected to the top surface of the inner wall of the control cavity (212). The guide rod (37) is elastically slidably connected to the control gear (33) through a tension spring (38).

2. The dust sampling device for coal-fired power plants according to claim 1, characterized in that: The bottom of the collecting pipe (13) is provided with a disassembly groove (131), and a mounting sealing plate (132) is detachably connected in the disassembly groove (131). The inclined exhaust pipe (12) is located on one side of the bottom end of the collecting pipe (13), and the inclined smoke inlet pipe (11) is located directly above the collecting pipe (13). The bottom end of the inclined smoke inlet pipe (11) extends into the interior of the collecting pipe (13). The outer ventilation connection pipe (21) is detachably connected to the bottom end of the inclined smoke inlet pipe (11), and the top of the outer ventilation connection pipe (21) is provided with a threaded fixing part (211) that is screwed into the inclined smoke inlet pipe (11).

3. The dust sampling device for coal-fired power plants according to claim 2, characterized in that: The upper and lower ends of the elastic inner filter (22) are open structures. The dust collection cup (23) and the outer ventilation connection pipe (21) are fixedly connected by multiple support rods. The bottom open end of the elastic inner filter (22) is fixedly connected to the dust collection cup (23) to form a closed end. The top open end of the elastic inner filter (22) is fixedly connected to the lower part of the threaded fixing part (211). The elastic inner filter (22) and the inclined smoke inlet pipe (11) form a gas passage.

4. The dust sampling device for coal-fired power plants according to claim 1, characterized in that: The diameters of the elastic inner filter (22) and the support cage (16) are both smaller than the diameter of the outer ventilation connection pipe (21). The outer ventilation connection pipe (21) and the elastic inner filter (22) form a stretching cavity of the elastic inner filter (22) and a clean gas flow cavity.

5. A dust sampling device for coal-fired power plants according to claim 1, characterized in that: The inclined smoke inlet pipe (11) is provided with a clean air filter pipe (14), and the bottom of the inclined smoke exhaust pipe (12) is provided with a flue gas inspection pipe (15). The clean air filter pipe (14) is connected to the inclined smoke inlet pipe (11), and the flue gas inspection pipe (15) is connected to the inclined smoke exhaust pipe (12). The inclined smoke inlet pipe (11), the inclined smoke exhaust pipe (12), the clean air filter pipe (14), the flue gas inspection pipe (15), and the dust collection cup (23) are all provided with independently controlled valves.

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