Boiler fly ash sampling and capturing device

Abstract

The invention relates to the technical field of fly ash sampling, in particular to a boiler fly ash sampling and capturing device which comprises an ash discharging pipe, a sampling pipe is arranged in the ash discharging pipe, and the sampling pipe is used for collecting samples from fly ash flowing through the ash discharging pipe; the collecting assembly comprises a first pipe body arranged in the sampling pipe, and a second pipe body is further arranged in the first pipe body to form a multi-stage structure; independent collecting cavities are respectively reserved among the sampling pipe, the first pipe body and the second pipe body and are used for separating and collecting fly ash particles with different particle sizes; a plurality of holes are horizontally formed in the sampling pipe, and filtering pieces are fixed to the positions, corresponding to the holes, of the first pipe body and the second pipe body and used for screening fly ash particles within the specific particle size range. And the driving assembly is arranged on the outer side of the ash discharge pipe. Through the design of the sampling pipe and the sleeve, the sampling pipe is allowed to rotate relative to the ash discharge pipe and is adjusted to be in a sealed state. Unscreened fly ash is prevented from entering collection, so that the purity and representativeness of a sample are ensured.

Description

Technical Field

[0001] The invention relates to the field of fly ash sampling, in particular to a boiler fly ash sampling and capturing device. Background Art

[0002] Boiler fly ash sampling technology involves the collection of suspended particulate matter (i.e. fly ash) in the exhaust gas produced after the combustion of coal-fired boilers for subsequent analysis. By analyzing these samples, the proportion of incompletely burned combustible components in the fly ash can be determined. This data is important for evaluating the efficiency of pulverized coal combustion and optimizing boiler operating parameters.

[0003] However, most fly ash sampling equipment on the market currently relies on semi-automatic or manual operation modes. This means that when performing sampling tasks, technicians must personally place the sampling equipment into the flue for on-site sampling. This method not only consumes a lot of time and human resources, but also significantly increases the difficulty of sampling when encountering complex layouts or non-standard shaped pipes, making the operation extremely inconvenient. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that when performing a sampling task, the technician must personally place the sampling equipment into the flue to perform on-site sampling work.

[0005] The above technical problems are solved by the following technical solutions: The present invention proposes a boiler fly ash sampling and capturing device, which includes an ash discharge pipe, a sampling pipe is arranged inside, and the sampling pipe is used to collect samples from the fly ash flowing through the ash discharge pipe; a collection component includes a first tube body arranged inside the sampling pipe, and a second tube body is further arranged inside the first tube body to form a multi-level structure; an independent collection cavity is retained between the sampling tube, the first tube body and the second tube body, respectively, for separating and collecting fly ash particles of different particle sizes; a plurality of holes are horizontally opened on the sampling tube, and at the positions corresponding to these holes, the first tube body and the second tube body are fixed with filters for screening fly ash particles within a specific particle size range. A drive component is arranged outside the ash discharge pipe; the sampling tube is driven by the drive component, and when the sampling tube is rotated to a preset angle, it can ensure that the inside of the sampling tube maintains a sealed state; an air pump component is connected to the drive component, and is used to absorb the fly ash in the collection component.

[0006] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: the filter element comprises a first filter element having a first filter hole, the first filter hole having a predetermined first average diameter; and a second filter element having a second filter hole, the second filter hole having a predetermined second average diameter. The first average diameter of the first filter hole is greater than the second average diameter of the second filter hole, so as to ensure that larger particulate matter is intercepted by the first filter element, while smaller particulate matter is further filtered by the second filter element.

[0007] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: the first filter element is located before the second filter element, so that the fluid first passes through the first filter element and then passes through the second filter element.

[0008] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: the first filter element and the second filter element are made of metal mesh, ceramic membrane or polymer fiber.

[0009] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: a sleeve is arranged at one end of the sampling tube; one end of the sleeve is connected to one end of the sampling tube, and the other end is fixed to the ash discharge pipe by bolt connection.

[0010] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: the collection component also includes a cleaning tube, which is respectively fixed to the inner wall of the sampling tube and the first tube body, and is arranged corresponding to the hole, wherein when the sampling tube rotates, it can scrape off the fly ash on the filter element; a groove portion is arranged on the surface of the first tube body and the second tube body, and when the cleaning tube is in contact with the groove portion, a gap will be left, and the gap is used to discharge and collect the scraped fly ash.

[0011] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: the driving assembly includes a shell, which is fixedly connected to the sleeve; a motor, which is installed on the outer surface of the shell; a gear, which is fixed to the output end of the motor; a tooth groove is provided on the outer side of the sampling tube, and the tooth groove and the gear form a meshing structure to realize driving the sampling tube to move by rotating the motor.

[0012] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: a plurality of driving blocks are fixed to the inner wall of the sampling tube, which are used to provide a driving force when the sampling tube is rotated to a preset angle; a first supporting slide bar is provided between the first tube body and the sampling tube, one end of the first supporting slide bar is fixedly connected to the first tube body, and the other end is pushed by the driving block so that the first tube body rotates to a preset angle.

[0013] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: a torsion spring is arranged between the first tube body and the sampling tube to provide a restoring torque for the first tube body, and a second supporting slide rod is arranged between the first tube body and the second tube body.

[0014] In a preferred embodiment of the boiler fly ash sampling and capturing device of the present invention: a sealing assembly is arranged inside the sampling tube, and the sealing assembly includes an annular sealing block that can be rotatably installed in the sampling tube and selectively covers or exposes the hole according to the rotation angle of the sampling tube; a counterweight block is connected to the bottom of the annular sealing block.

[0015] The beneficial effect of the present invention is that the design of the sampling tube and the sleeve allows the sampling tube to rotate relative to the ash discharge pipe to adjust to a sealed state, thereby preventing unscreened fly ash from entering the collection process, thereby ensuring the purity and representativeness of the sample.

[0016] By adopting a multi-stage filtering device consisting of a first filter element and a second filter element, fly ash particles of different particle sizes can be effectively separated. This graded filtering method not only improves the sampling accuracy, but also prolongs the service life of the filter element.

[0017] The plugging assembly allows the hole to be opened or closed automatically according to the angle change of the sampling tube. For application scenarios that require flexible control of sampling timing, it can adapt to different sampling needs, such as short-term rapid sampling or long-term continuous sampling.

[0018] The cleaning tube and groove can scrape off the fly ash adhering to the filter element during sampling and guide it to the collection chamber. This function helps maintain the performance of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] Figure 1 A three-dimensional view of a sampling tube of a boiler fly ash sampling and capturing device is shown; Figure 2 A schematic diagram of fly ash flow from a sampling tube of a boiler fly ash sampling and capturing device viewed from above is shown; Figure 3 A stereoscopic view of the tooth groove of a boiler fly ash sampling and capturing device is shown; Figure 4 A schematic diagram of a collection chamber of a boiler fly ash sampling and capturing device is shown; Figure 5 A schematic plan view showing the rotation of the sampling tube of the boiler fly ash sampling and capturing device is shown.

[0021] Figure 6 A schematic three-dimensional diagram showing the rotation of the sampling tube of the boiler fly ash sampling and capturing device is shown.

[0022] Figure 7 A stereoscopic view of an annular blocking block of a boiler fly ash sampling and capturing device is shown. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0024] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present invention.

[0025] Reference Figure 1-Figure 3 The present embodiment provides a boiler fly ash sampling and capturing device, including an ash discharge pipe 1, a sampling pipe 11 is provided inside the sampling pipe 1, and the sampling pipe 11 is used to collect samples from the fly ash flowing through the ash discharge pipe 1; a collection component 2, including a first tube body 21 arranged inside the sampling pipe 11, and a second tube body 22 is further provided inside the first tube body 21 to form a multi-level structure; an independent collection chamber 3 is retained between the sampling pipe 11, the first tube body 21 and the second tube body 22, respectively, for separating and collecting fly ash particles of different particle sizes; a plurality of holes 111 are horizontally opened on the sampling pipe 11, and at the positions corresponding to these holes 111, the first tube body 21 and the second tube body 22 are fixed with a filter 23 to screen fly ash particles within a specific particle size range. A driving component 4 is arranged outside the ash discharge pipe 1; the sampling pipe 11 is driven by the driving component 4, and when the sampling pipe 11 is rotated to a preset angle, it can ensure that the inside of the sampling pipe 11 is kept in a sealed state; an air pump component 5 is connected to the driving component 4, and is used to absorb the fly ash in the collection component 2.

[0026] In this embodiment, in modern industrial production, especially in industries involving combustion processes, such as thermal power generation, metallurgy and chemical industry, boilers are vital equipment. In order to ensure the safe operation of the boiler and environmental protection requirements, it is necessary to monitor and control the particulate matter in the exhaust gas discharged by the boiler. Among them, the characteristic analysis of fly ash (i.e., fine solid particles separated from boiler flue gas) is crucial for evaluating boiler performance, pollutant emissions and taking corresponding control measures.

[0027] This device can not only collect fly ash particles of different particle sizes, but also ensure the integrity of the samples during the sampling process, thereby providing a reliable data basis for subsequent laboratory analysis.

[0028] The ash discharge pipe 1 is a passage connecting the boiler with the external environment or the treatment system, and a sampling pipe 11 is arranged inside the ash discharge pipe, which serves as the main working area for fly ash sampling.

[0029] The sampling pipe 11 is located inside the ash discharge pipe 1 and is specifically used to extract samples from the flowing fly ash flow. A plurality of holes 111 are horizontally opened on the sampling pipe 11, and these holes 111 are the entrances for the fly ash to enter the sampling pipe 11.

[0030] The first tube body 21 is installed inside the sampling tube 11, and further embedded with the second tube body 22 to form a multi-level structure. Such a design allows fly ash particles of different sizes to be separated.

[0031] The second tube body 22 is disposed in the first tube body 21 and cooperates with the first tube body 21 to achieve multi-stage filtration.

[0032] An independent collecting chamber 3 is respectively reserved between the sampling tube 11 , the first tube body 21 and the second tube body 22 , for classifying and collecting fly ash particles of different particle sizes screened by the filter element 23 .

[0033] Filters 23 are fixed to the first tube body 21 and the second tube body 22 at positions corresponding to the holes 111 on the sampling tube 11. These filters 23 select fly ash particles within a specific particle size range according to set parameters to ensure that each collection chamber 3 contains only particles that meet the standards.

[0034] The driving assembly 4 is arranged outside the ash discharge pipe 1 and is responsible for driving the sampling pipe 11 to rotate. When the sampling pipe 11 rotates to a preset angle, it will automatically adjust to a sealed state to prevent subsequent fly ash that is not within the preset collection standard from mixing into the collected sample, thereby maintaining the purity of the sampling process.

[0035] The air pump assembly 5 is connected to the driving assembly 4 and is mainly responsible for creating a negative pressure environment, so as to effectively absorb the fly ash samples that have been collected in the collection assembly 2. Specifically, when the sampling tube 11 is in a sealed state, the air pump will reduce the air pressure in the sampling tube 11 after it is started, forming a negative pressure difference relative to the external atmospheric pressure. This negative pressure difference allows the fly ash samples in the collection assembly 2 to be smoothly extracted and moved along a pre-set path to a designated location, such as a temporary storage container or directly into a transport container, for subsequent processing.

[0036] In order to ensure the efficiency and accuracy of sample transmission, the air pump assembly 5 is also equipped with multiple air pipes. These air pipes are fixedly mounted on the housing 41, and each air pipe is directly connected to the corresponding collection chamber 3. This layout of multiple air pipes also helps to prevent cross contamination between fly ash samples from different sources, thereby ensuring the purity of the samples.

[0037] The collection effect can be further improved by adding a so-called "air blowing tube" to the sampling tube 11. The function of the "air blowing tube" is to inject a slight airflow into the sampling tube 11 during the suction process of the air pump. This airflow can help loosen the fine fly ash particles attached to the tube wall, making them easier to be carried away by the airflow, thereby improving the collection efficiency. At the same time, the use of the "air blowing tube" can also reduce the risk of blockage caused by fly ash deposition.

[0038] Working principle: when fly ash passes through the ash discharge pipe 1 with the air flow, part of the fly ash will enter the sampling tube 11 through the hole 111 on the sampling tube 11, and will be filtered by the first tube body 21 and the second tube body 22 in turn. In this process, fly ash particles of different particle sizes will be deposited in different collection chambers 3 due to the influence of inertia, gravity and other factors. At the same time, the drive component 4 operates according to a predetermined program, so that the sampling tube 11 can maintain a sealed state within an appropriate period of time to avoid cross contamination. Finally, the air pump component 5 is started to extract the fly ash samples in each collection chamber 3 one by one, completing the entire sampling process.

[0039] The boiler fly ash sampling and capturing device has the following advantages: the multi-stage filter element 23 ensures the effective separation of fly ash of different particle sizes and improves the accuracy of sampling. The sealing design and the air pump assembly 5 reduce the influence of external factors on the sample and ensure the reliability of the sample. The high degree of automation simplifies the sampling process, reduces the need for manual intervention, and improves work efficiency.

[0040] In addition, the device allows the operator to easily switch the working mode according to different needs (such as short-term rapid sampling or long-term continuous sampling). For long-term continuous sampling, a timed opening / closing controller can be added inside the sampling component to control the operation of the driving component 4, automatically opening or closing the hole 111 according to a preset time interval, to ensure that the fly ash samples obtained in each preset time period will not mix with each other.

[0041] refer to Figure 6 In one embodiment provided in the present application, the filter element 23 includes a first filter element having a first filter hole, the first filter hole having a predetermined first average diameter; and a second filter element having a second filter hole, the second filter hole having a predetermined second average diameter. The first average diameter of the first filter hole is greater than the second average diameter of the second filter hole to ensure that larger particulate matter is intercepted by the first filter element, while smaller particulate matter is further filtered by the second filter element. The first filter element is located before the second filter element, so that the fluid first passes through the first filter element and then passes through the second filter element. The first filter element and the second filter element are made of metal mesh, ceramic membrane or polymer fiber.

[0042] In this embodiment, the filter element 23 described is a multi-stage filtering device composed of two different filter elements. That is, impurities in the fluid are removed in sequence by setting filter layers with different pore sizes. Specifically, the first filter element has a first filter hole with a larger average diameter, which is used to intercept larger-sized particulate matter; while the second filter element has a second filter hole with a smaller average diameter, which is intended to capture small particulate matter that has passed through the first filter element. Such a double-layer filtering structure ensures that the fluid can be effectively purified, while reducing the burden of a single filter element and extending the service life of the entire filter element 23.

[0043] When a fluid containing particulate matter enters this filter element 23, it will first contact the first filter element. Since the pores of the first filter element are relatively large, it can effectively block all particles larger than its average diameter, allowing smaller particles to continue to move forward with the fluid. Next, the fluid after preliminary filtration will flow to the second filter element. At this time, because the pores of the second filter element are smaller, it can further remove the remaining small particulate matter to ensure that the final outflowing fluid is as pure as possible. This step-by-step filtration method not only improves the filtration efficiency, but also allows each filter element to focus on processing particles within a specific particle size range, thereby optimizing the entire filtration process.

[0044] refer to Figure 3-Figure 5 In one embodiment provided in the present application, a sleeve 1111 is provided at one end of the sampling tube 11; the sleeve 1111 is connected to one end of the sampling tube 11 at one end, and the other end is fixed to the ash discharge pipe 1 by bolt connection. A sealed bearing is located in the sampling tube 11 and connected to the sleeve 1111, allowing the sampling tube 11 to rotate relative to the sleeve 1111; the driving assembly 4 includes a housing 41, which is fixedly connected to the sleeve 1111; a motor 42, which is mounted on the outer surface of the housing 41; a gear, which is fixed to the output end of the motor 42; a tooth groove 43 is provided on the outer side of the sampling tube 11, and the tooth groove 43 forms a meshing structure with the gear to achieve the movement of the sampling tube 11 by the rotation of the motor 42.

[0045] In this embodiment, the sleeve 1111 serves as a bridge as a component connecting the sampling tube 11 and the ash discharge tube 1. One end of the sleeve 1111 is fixedly connected to the sampling tube 11, and the other end is fixed to the ash discharge tube 1 by bolt connection. The bolt connection ensures the reliability of the connection and is also convenient for disassembly and maintenance.

[0046] The sealing bearing is located inside the sampling tube 11 and connected to the sleeve 1111 . Its main function is to allow the sampling tube 11 to rotate relative to the sleeve 1111 while ensuring airtightness.

[0047] The driving assembly 4 is responsible for providing the power for the rotation of the sampling tube 11, and mainly includes three parts: a housing 41, a motor 42, and a gear. The housing 41 is used as a carrier of the motor 42 and other related components, and is fixedly connected to the sleeve 1111; the motor 42 is installed on the outer surface of the housing 41, and transmits the power to the tooth groove 43 on the sampling tube 11 through gear transmission, thereby realizing the rotation of the sampling tube 11.

[0048] When the motor 42 is started, the gear on the output shaft starts to rotate, and through meshing with the tooth groove 43 on the outer side of the sampling tube 11, drives the sampling tube 11 to rotate together.

[0049] refer to Figure 5 and Figure 6In some embodiments, a plurality of driving blocks 44 are fixed to the inner wall of the sampling tube 11 to provide a driving force when the sampling tube 11 rotates to a preset angle; a first supporting slide bar 6 is provided between the first tube body 21 and the sampling tube 11, one end of the first supporting slide bar 6 is fixedly connected to the first tube body 21, and the other end is pushed by the driving block 44 to rotate the first tube body 21 to a preset angle. A torsion spring is provided between the first tube body 21 and the sampling tube 11 to provide a restoring torque for the first tube body 21, and a second supporting slide bar 7 is provided between the first tube body 21 and the second tube body 22.

[0050] In this embodiment, a plurality of driving blocks 44 are installed on the inner wall of the sampling tube 11. The positions and number of the driving blocks 44 are determined according to specific application requirements, and their main function is to provide additional driving force when the sampling tube 11 rotates to a preset angle.

[0051] The first tube body 21 is connected to the sampling tube 11, but the movements of the two are not completely synchronized. Under normal circumstances, the first tube body 21 remains stationary. In order to achieve independent rotation of the sampling tube 11, there must be a certain connection mechanism between the two, that is, the first support slide bar 6.

[0052] One end of the first support slide bar 6 is fixedly connected to the first tube body 21, and the other end is directly affected by the driving block 44 in the sampling tube 11. When the driving block 44 in the sampling tube 11 is triggered by the sampling tube 11 rotating to a preset angle, it pushes the first support slide bar 6, thereby driving the first tube body 21 to rotate to a predetermined position.

[0053] In order to enable the first tube body 21 to smoothly return to the initial position, a torsion spring is added between the first tube body 21 and the sampling tube 11. When the first tube body 21 rotates due to the action of the driving block 44, the torsion spring will be stretched or compressed to store energy. Once the external force disappears, for example, after the sampling is completed, the torsion spring releases the stored energy and applies a reverse torsion force to the first tube body 21, causing it to return to its original state.

[0054] The first supporting sliding bar 6 and the second supporting sliding bar 7 are used to maintain the relative position between the two tubes.

[0055] Working principle: as the sampling tube 11 gradually rotates, when it reaches a preset angle, such as 90°, the driving block 44 on the inner wall of the sampling tube 11 will touch the first supporting slide bar 6. At this time, due to the contact force between the driving block 44 and the supporting slide bar, the supporting slide bar begins to receive the driving force from the driving block 44. This force is sufficient to overcome the existing friction and other resistances, so that the first supporting slide bar 6 can smoothly push the first tube body 21 to rotate together, automatically adjust to a sealed state, prevent the subsequent fly ash that is not within the preset collection standard from mixing into the collected sample, and maintain the purity of the sampling process.

[0056] refer to Figure 5 and Figure 6 In one embodiment provided in the present application, the collection component 2 also includes a cleaning tube 24, which is respectively fixed on the inner wall of the sampling tube 11 and the first tube body 21, and is arranged corresponding to the hole 111, wherein when the sampling tube 11 rotates, it can scrape off the fly ash on the filter element 23; a groove portion 25 is arranged on the surface of the first tube body 21 and the second tube body 22, and when the cleaning tube 24 is in contact with the groove portion 25, a gap will be left, and the gap is used to discharge and collect the scraped fly ash.

[0057] In this embodiment, the cleaning tube 24 is installed on the inner wall of the sampling tube 11 and the first tube body 21, corresponding to the position of the hole 111. When the sampling tube 11 rotates, the cleaning tube 24 rotates accordingly, and its edge can contact the surface of the filter element 23, thereby achieving the scraping effect on the fly ash.

[0058] The groove 25 is arranged on the outer surface of the first tube body 21 and the second tube body 22, and its main function is to form a gap when the cleaning tube 24 is attached thereto, so as to ensure that the collected fly ash is discharged smoothly through the gap and enters the pre-prepared collection chamber 3.

[0059] Working principle: when the entire collection assembly 2 starts to operate, the sampling tube 11 will rotate at a predetermined speed and direction. As the sampling tube 11 rotates, the cleaning tube 24 fixed inside it also starts to move and slides along the surface of the filter 23. At this time, the edge of the cleaning tube 24 acts like a brush to gradually remove the fly ash adhering to the filter 23. Since there is a gap between the cleaning tube 24 and the groove 25, the scraped fly ash can flow smoothly into the gap and finally be guided to the collection chamber 3 below.

[0060] It should be noted that a plurality of sealing layers are fixed on the surfaces of the first tube body 21 and the second tube body 22 . When the cleaning tube 24 is at the initial position or rotated to a preset position, it will abut against the sealing layers to improve the sealing performance.

[0061] refer to Figure 7 As an optional embodiment, the sealing assembly 8 is arranged inside the sampling tube 11. The sealing assembly 8 includes an annular sealing block 81, which is rotatably installed in the sampling tube 11 and selectively covers or exposes the hole 111 according to the rotation angle of the sampling tube 11; a counterweight block 82 is connected to the bottom of the annular sealing block 81.

[0062] In this embodiment, the annular blocking block 81 is installed inside the sampling tube 11 and can rotate around a certain axis. The annular blocking block 81 is to selectively cover or expose the hole 111 on the sampling tube 11 according to the angle change of the sampling tube 11. This means that when the sampling tube 11 is in a preset position, the hole 111 is open for sampling; and when the sampling tube 11 is tilted to a certain angle, the annular blocking block 81 will automatically close the hole 111 to prevent sample contamination.

[0063] The counterweight block 82 is connected to one end of the annular blocking block 81. The main function of the counterweight block 82 is to maintain the balance of the annular blocking block 81 under the action of gravity when the sampling tube 11 is tilted, so that the sampling tube 11 can automatically correspond to the blocking area or sampling area on the annular blocking block 81 when it rotates. This allows the blocking assembly 8 to automatically respond to the posture change of the sampling tube 11 without an external power source.

[0064] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. Boiler fly ash sampling and capturing device, characterized by: include, An ash discharge pipe (1) having a sampling pipe (11) disposed therein; A collection assembly (2) comprises a first tube body (21) arranged inside a sampling tube (11), wherein a second tube body (22) is arranged inside the first tube body (21); An independent collection chamber (3) is provided between the sampling tube (11), the first tube body (21) and the second tube body (22); A plurality of holes (111) are horizontally opened on the sampling tube (11), and filter elements (23) are fixed to the first tube body (21) and the second tube body (22) at positions corresponding to the holes (111); A driving assembly (4) is arranged outside the ash discharge pipe (1); The sampling tube (11) is driven by a driving assembly (4); when the sampling tube (11) is rotated to a preset angle, the hole (111) is closed, so that the interior of the sampling tube (11) is maintained in a sealed state; An air pump component (5) is connected to the driving component (4) and is used to absorb the fly ash in the collecting component (2).

2. The boiler fly ash sampling and capturing device according to claim 1, characterized in that: The filter element (23) comprises: A first filter element, mounted on the first tube body (21), having a first filter hole, the first filter hole having a predetermined first average diameter; A second filter element, mounted on the second tube body (22), having a second filter hole, the second filter hole having a predetermined second average diameter; The first average diameter of the first filter pores is greater than the second average diameter of the second filter pores to ensure that particulate matter is intercepted by the first filter element, while particulate matter is further filtered by the second filter element.

3. The boiler fly ash sampling and capturing device according to claim 2, characterized in that: The first filter element is located before the second filter element, so that the fluid first passes through the first filter element and then passes through the second filter element.

4. The boiler fly ash sampling and capturing device according to claim 3 is characterized in that: The first filter element and the second filter element are made of metal mesh, ceramic membrane or polymer fiber.

5. The boiler fly ash sampling and capturing device according to claim 4, characterized in that: A sleeve (1111) is disposed at one end of the sampling tube (11); one end of the sleeve (1111) is connected to one end of the sampling tube (11), and the other end is fixed to the ash discharge pipe (1) by means of bolt connection.

6. The boiler fly ash sampling and capturing device according to claim 1, characterized in that: The collection assembly (2) further comprises: a cleaning tube (24) fixed to the inner walls of the sampling tube (11) and the first tube body (21), respectively, and arranged corresponding to the hole (111), wherein when the sampling tube (11) rotates, it is capable of scraping off fly ash on the filter element (23); and a groove portion (25) provided on the surfaces of the first tube body (21) and the second tube body (22), wherein when the cleaning tube (24) and the groove portion (25) are in contact with each other, a gap is left, and the gap is used to discharge and collect the scraped fly ash.

7. The boiler fly ash sampling and capturing device according to claim 1, characterized in that: The driving assembly (4) comprises a housing (41), the housing (41) being fixedly connected to the sleeve (1111); a motor (42) mounted on the outer surface of the housing (41); and a gear fixed to the output end of the motor (42); and a tooth groove (43) being provided on the outer side of the sampling tube (11), the tooth groove (43) and the gear forming a meshing structure, so as to achieve driving the sampling tube (11) to move by rotating the motor (42).

8. The boiler fly ash sampling and capturing device according to claim 7, characterized in that: A plurality of driving blocks (44) are fixed to the inner wall of the sampling tube (11) for providing a driving force when the sampling tube (11) is rotated to a preset angle; a first supporting slide bar (6) is provided between the first tube body (21) and the sampling tube (11); one end of the first supporting slide bar (6) is fixedly connected to the first tube body (21), and the other end is pushed by the driving block (44) so ​​that the first tube body (21) is rotated to the preset angle.

9. The boiler fly ash sampling and capturing device according to claim 8, characterized in that: A torsion spring is provided between the first tube body (21) and the sampling tube (11) to provide a restoring torque for the first tube body (21), and a second supporting sliding rod (7) is provided between the first tube body (21) and the second tube body (22).

10. The boiler fly ash sampling and capturing device according to claim 9, characterized in that: A plugging assembly (8) is arranged inside the sampling tube (11), the plugging assembly (8) comprising an annular plugging block (81) rotatably mounted inside the sampling tube (11) and selectively covering or exposing the hole (111) according to the rotation angle of the sampling tube (11); and a counterweight block (82) connected to the bottom of the annular plugging block (81).

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