Coal-fired boiler high-dust and high-temperature flue gas sampling device and method

Abstract

The invention discloses a coal-fired boiler high-dust and high-temperature flue gas sampling device and method, and relates to the technical field of flue gas component detection, and the coal-fired boiler high-dust and high-temperature flue gas sampling device comprises a sampling pipeline system used for sampling flue gas and capable of reversing flow; the air supply pipeline system is used for feeding hot air and can flow in a reversing manner; two branches of the three-way pipes are respectively connected with the sampling pipeline system and the air supply pipeline system; the outer wall of one side of each sampling box is fixedly provided with an air inlet pipe communicated with the sampling box, the air inlet pipe is provided with an electromagnetic valve, the outer wall of the other side of each sampling box is provided with a fixing hole, and the rest branch of the three-way pipe is fixed in the fixing hole; a metal filter element is rotationally mounted on the outer wall of a branch, located in the sampling box, of the three-way pipe through a sealing bearing, a driving assembly is arranged in the sampling box, and the metal filter element is connected with the driving assembly. The metal filter element 5 can be automatically cleaned, and meanwhile the sampling work is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas component detection, and in particular relates to a high-dust and high-temperature flue gas sampling device and method for a coal-fired boiler. Background Art

[0002] During the combustion process, the pulverized coal in the thermal power plant boiler will produce a large amount of high-temperature flue gas, which contains a large amount of dust, NOx, SO2, Hg and other pollutants. Therefore, various countries in the world have stipulated emission limits for different pollutants in coal-fired flue gas. In order to meet different emission limits, a series of flue gas treatment facilities are installed at the tail of the coal-fired power plant boiler, and the generated flue gas needs to be sampled and tested.

[0003] In the prior art, for example, the Chinese invention with announcement number CN207396135U relates to the field of flue gas component detection, and in particular to a high-dust and high-temperature flue gas sampling device for coal-fired boilers, which is characterized by comprising a flue gas sampling head and a flue gas sampling tube. The number of flue gas sampling heads and flue gas sampling tubes is the same. The flue gas sampling head includes a housing, a gasket, a piston, a positioning ring, a filter screen, and a filter element. The various parts in the flue gas sampling head are coaxially arranged, and the flue gas enters through the bottom of the housing. The device extends into the vertical flue, can filter particulate matter in the flue gas, can rely on gravity to automatically close the flue gas inlet and automatically filter and remove dust; can be flexibly disassembled, cleaned, and replaced; can be withdrawn from the flue for easy maintenance and repair.

[0004] The above scheme cleans the inside of the filter element by scraping, but there are some oily substances in the flue gas that will adhere to the filter element. The scraping method cannot remove the oily substances well, so the filter element in the sampling head needs to be cleaned regularly, which requires removing the entire sampling tube, stopping the sampling work and affecting the sampling efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a high-dust and high-temperature flue gas sampling device and method for a coal-fired boiler, so as to solve the technical problem in the prior art that the filter element in the sampling tube needs to be cleaned regularly, which requires the entire sampling head to be removed, stopping the sampling work and affecting the sampling efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A high-dust and high-temperature flue gas sampling device for a coal-fired boiler, comprising: A sampling pipe system for sampling flue gas and capable of reversing flow; An air supply pipe system for supplying hot air and capable of reversing flow; Two tee pipes, two branches of which are respectively connected to the sampling pipeline system and the air supply pipeline system; Two parallel sampling boxes, one side of the sampling box is fixed with an air inlet pipe connected thereto, and a solenoid valve is installed on the air inlet pipe, the other side of the sampling box is provided with a fixing hole on the outer wall, and the remaining branch of the three-way pipe is fixed in the fixing hole, the outer wall of the branch of the three-way pipe located in the sampling box is rotatably mounted with a metal filter element through a sealing bearing, the interior of the sampling box is provided with a driving assembly, the metal filter element is connected to the driving assembly, and the driving assembly causes the metal filter element to rotate axially, a nylon brush in contact with the metal filter element is fixed inside the sampling box, a nozzle with a nozzle facing the metal filter element is installed inside the sampling box, and a collecting box connected thereto is fixed at the bottom of the sampling box; Two liquid delivery components deliver cleaning liquid to the two nozzles respectively.

[0007] Preferably, the sampling pipeline system comprises: A heat tracing pipe with a heating wire embedded inside; A sampling tube, one end of which is connected to one end of the heating tube; The sampling tube is connected to two tee pipes.

[0008] Preferably, the sampling pipeline system further includes: a second electromagnetic reversing valve, and the sampling tube is connected to the two three-way tubes via the second electromagnetic reversing valve.

[0009] Preferably, the air supply pipeline system comprises: Blower; An air heat exchanger, wherein the air supply end of the air blower is connected to the air inlet end of the air heat exchanger; The first electromagnetic reversing valve, the air supply end of the air heat exchanger is connected to the two three-way pipes through the first electromagnetic reversing valve.

[0010] Preferably, the drive assembly comprises: A servo motor, wherein the output shaft of the servo motor is located in the sampling box; Driven gear, the driven gear is coaxially fixed with the metal filter element; Transmission gear, the output shaft of the servo motor is coaxially fixed with the transmission gear, and the transmission gear is meshed with the driven gear.

[0011] Preferably, the entire servo motor is fixed in the sampling box.

[0012] Preferably, the bristles of the nylon brush are made of high temperature resistant nylon.

[0013] Preferably, the liquid delivery component comprises: A tank containing cleaning fluid.

[0014] Preferably, the liquid delivery component further comprises: A liquid pump, wherein the liquid inlet end of the liquid pump is connected to the liquid storage tank, and the liquid delivery end of the liquid pump is connected to the nozzle.

[0015] A method for sampling high-dust and high-temperature flue gas from a coal-fired boiler, comprising: The two air inlet pipes are connected to the same boiler exhaust pipe, one of the solenoid valves is opened, the flue gas enters the air sampling box through the air inlet pipe, the metal filter element is filtered, the filtered flue gas enters the three-way pipe, and the air supply pipeline system on the three-way pipe does not supply hot air. The sampling pipeline system samples the three-way pipe containing the filtered flue gas. After the set working time, the opened solenoid valve is closed, and the other solenoid valve is opened, the flue gas enters the other air inlet pipe, the sampling pipeline system samples in the other three-way pipe, and the air supply pipeline system is sent into the three-way pipe where the hot air has been worked. The hot air backflushes the metal filter element to wash away the dust particles. The liquid delivery component sends the cleaning liquid into the nozzle in the sampling box that has been worked, and the nozzle flushes the metal filter element. The driving component causes the metal filter element to rotate axially, and the metal filter element is washed by a nylon brush. The hot air is used to dry the metal filter element for the next work.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a high-dust and high-temperature flue gas sampling device and method for a coal-fired boiler, which connects two air intake pipes to the same boiler exhaust pipe, opens one of the solenoid valves, and the flue gas enters the air sampling box through the air intake pipe, is filtered by the metal filter element, and the filtered flue gas enters the three-way pipe, and the air supply pipeline system on the three-way pipe does not supply hot air, and the sampling pipeline system samples the three-way pipe containing the filtered flue gas. After the set working time, the opened solenoid valve is closed, and the other solenoid valve is opened, and the flue gas enters the other air intake pipe, and the sampling pipe The air supply system takes samples in another three-way pipe, and the air supply pipe system sends hot air into the three-way pipe where the work has been completed. The hot air backwashes the metal filter element to wash off the dust particles. The liquid delivery component sends a certain amount of cleaning liquid into the nozzle in the sampling box that has been completed. The nozzle flushes the metal filter element, and the driving component causes the metal filter element to rotate axially. The metal filter element is washed by a nylon brush, and the hot air is used to dry the metal filter element for the next work. It can be seen that the sampler can automatically clean the metal filter element without affecting the sampling work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of two sampling boxes of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of two sampling boxes of the present invention; Figure 3 yes Figure 2 A schematic diagram of the front view structure of Figure 4 is a schematic cross-sectional view of a sampling box of the present invention; Figure 5 It is a schematic diagram of the air supply pipeline system and the sampling pipeline system of the present invention; Figure 6 It is a schematic diagram of the liquid delivery component of the present invention.

[0018] Description of reference numerals: 1. Sampling box; 2. Servo motor; 3. T-tube; 4. Inlet pipe; 5. Metal filter element; 6. Nylon brush; 7. Driven gear; 8. Transmission gear; 9. Nozzle; 10. Collection box; 11. Blower; 12. Air heat exchanger; 13. First solenoid reversing valve; 14. Second solenoid reversing valve; 15. Heating pipe; 16. Sampling tube; 17. Liquid storage tank; 18. Liquid pump. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0027] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1 like Figures 1 to 6 As shown, this embodiment provides a high-dust and high-temperature flue gas sampling device for a coal-fired boiler, comprising: A sampling pipe system for sampling flue gas and capable of reversing flow; An air supply pipe system for supplying hot air and capable of reversing flow; Two three-way pipes 3, two branches of which are respectively connected to the sampling pipeline system and the air supply pipeline system; Two parallel sampling boxes 1, an air inlet pipe 4 connected to the sampling box 1 is fixed on the outer wall of one side, and a solenoid valve is installed on the air inlet pipe 4, a fixing hole is opened on the outer wall of the other side of the sampling box 1, and the remaining branch of the three-way pipe 3 is fixed in the fixing hole, a metal filter element 5 is rotatably installed on the outer wall of the branch of the three-way pipe 3 located in the sampling box 1 through a sealed bearing, a driving component is arranged inside the sampling box 1, the metal filter element 5 is connected to the driving component, and the driving component causes the metal filter element 5 to rotate axially, a nylon brush 6 in contact with the metal filter element 5 is fixed inside the sampling box 1, a nozzle 9 with a nozzle facing the metal filter element 5 is installed inside the sampling box 1, and a collecting box 10 connected to the bottom of the sampling box 1 is fixed; Two liquid delivery components for delivering cleaning liquid to the two nozzles 9 respectively; Through the above connection relationship, it can be known that the present scheme is to connect the two air intake pipes 4 with the same boiler exhaust pipe, open one of the solenoid valves, and the smoke enters the air sampling box 1 through the air intake pipe 4, and is filtered by the metal filter element 5. The filtered smoke enters the three-way pipe 3, and the air supply pipeline system on the three-way pipe 3 does not supply hot air. The sampling pipeline system samples the three-way pipe 3 containing the filtered smoke. After the set working time, the opened solenoid valve is closed, and the other solenoid valve is opened, and the smoke enters the other air intake pipe 4. The sampling pipeline system is in the other three Sampling is carried out in the through pipe 3, and the air supply pipeline system sends hot air into the three-way pipe 3 where the work has been completed. The hot air recoils the metal filter element 5 to wash off the dust particles. The liquid delivery component sends a certain amount of cleaning liquid into the nozzle 9 in the sampling box 1 that has been completed. The nozzle 9 flushes the metal filter element 5. The driving component causes the metal filter element 5 to rotate axially. The metal filter element 5 is washed by the nylon brush 6, and the hot air is used to dry the metal filter element 5 in preparation for the next work. It can be seen that the sampler can automatically clean the metal filter element 5 without affecting the sampling work.

[0030] Specifically, the sampling pipeline system includes: A heating pipe 15 with a heating wire embedded therein; A sampling tube 16, one end of which is connected to one end of the heating tube 15; A second electromagnetic reversing valve 14, wherein the sampling tube 16 is connected to the two three-way tubes 3 through the second electromagnetic reversing valve 14; From the above connection relationship, it can be known that in this solution, the heating pipe 15 is used to heat the filtered flue gas. The gas will expand under high temperature, thereby creating a high-pressure environment. The heating pipe 15 on the sampling tube 16 samples from one of the three-way pipes 3 through the second electromagnetic reversing valve 14.

[0031] Specifically, the air supply pipeline system includes: Blower 11; The air heat exchanger 12, the air supply end of the air blower 11 is connected to the air inlet end of the air heat exchanger 12; A first electromagnetic reversing valve 13, the air supply end of the air heat exchanger 12 is connected to the two three-way pipes 3 through the first electromagnetic reversing valve 13; From the above connection relationship, it can be known that in this solution, the blower 11 delivers airflow, and the airflow is heated by the air heat exchanger 12 to form hot air, and the hot air enters the three-way pipe 3 to be entered through the first electromagnetic reversing valve 13.

[0032] Specifically, the drive assembly includes: A servo motor 2, wherein the entire servo motor 2 is fixed in the sampling box 1, and an output shaft of the servo motor 2 is located in the sampling box 1; A driven gear 7, the driven gear 7 is coaxially fixed with the metal filter element 5; Transmission gear 8, the output shaft of the servo motor 2 is coaxially fixed with the transmission gear 8, and the transmission gear 8 is meshed with the driven gear 7; From the above connection relationship, it can be known that in this solution, the servo motor 2 causes the transmission gear 8 to axially rotate through the output shaft, and the transmission gear 8 causes the metal filter element 5 to axially rotate through the driven gear 7.

[0033] Specifically, the bristles of the nylon brush 6 are made of high temperature resistant nylon material. To supplement this, the high temperature resistant nylon material can be PAA plastic, which is not specifically limited here.

[0034] Specifically, the liquid delivery component includes: A liquid storage tank 17 containing cleaning liquid; A liquid pump 18, wherein the liquid inlet end of the liquid pump 18 is connected to the liquid storage tank 17, and the liquid delivery end of the liquid pump 18 is connected to the nozzle 9; From the above connection relationship, it can be known that in this solution, the liquid pump 18 delivers the cleaning liquid in the liquid storage tank 17 into the nozzle 9.

[0035] To supplement the above: a separate control console can be set up in the factory or the main control console in the factory can be used directly. The above-mentioned electrical components are electrically connected to the controller in the control console, but the heating wire of the heating pipe 15 is connected to the circuit system used for power supply in the factory. The control console and the circuit system are mature existing technologies and are not specifically explained in this scheme, so no detailed principle explanation will be given.

[0036] Example 2 like Figures 1 to 6 As shown, this embodiment provides a method for sampling high-dust and high-temperature flue gas from a coal-fired boiler, comprising: The two air inlet pipes 4 are connected to the same boiler exhaust pipe, one of the solenoid valves is opened, the flue gas enters the air sampling box 1 through the air inlet pipe 4, the metal filter element 5 is filtered, the filtered flue gas enters the three-way pipe 3, and the air supply pipeline system on the three-way pipe 3 does not send hot air, the sampling pipeline system samples the three-way pipe 3 containing the filtered flue gas, after the set working time, the opened solenoid valve is closed, the other solenoid valve is opened, the flue gas enters the other air inlet pipe 4, the sampling pipeline system samples in the other three-way pipe 3, the air supply pipeline system sends hot air into the three-way pipe 3 where the hot air has been worked, the hot air backwashes the metal filter element 5 to wash away the dust particles, the liquid delivery component sends the cleaning liquid into the nozzle 9 in the sampling box 1 that has been worked, the nozzle 9 flushes the metal filter element 5, the driving component causes the metal filter element 5 to rotate axially, the metal filter element 5 is washed by the nylon brush 6, and the hot air is used to dry the metal filter element 5 for the next work.

[0037] Example 3 like Figures 1 to 6 As shown, this embodiment provides a method for sampling high-dust and high-temperature flue gas from a coal-fired boiler, comprising: The two air inlet pipes 4 are connected to the same boiler exhaust pipe, one of the solenoid valves is opened, the smoke enters the air sampling box 1 through the air inlet pipe 4, and is filtered by the metal filter element 5. The filtered smoke enters the three-way pipe 3, and the air supply pipeline system on the three-way pipe 3 does not send hot air. The sampling pipeline system samples the three-way pipe 3 containing the filtered smoke (the heating pipe 15 on the sampling pipe 16 is connected with it through the second solenoid reversing valve 14). After the set working time, the opened solenoid valve is closed, and the other solenoid valve is opened, and the smoke enters the other air inlet pipe 4. The sampling pipeline system samples in the other three-way pipe 3, and the air supply pipeline system sends the hot air into the three-way pipe 3 where the work has been completed (the air blower 11 sends the air flow, and the air flow is heated by the air heat exchanger 12, Hot air is formed, and the hot air enters the three-way pipe 3 to be entered through the first electromagnetic reversing valve 13). The hot air backwashes the metal filter element 5 to wash off the dust particles. The liquid delivery component delivers a certain amount of cleaning liquid into the nozzle 9 in the sampling box 1 that has completed the work (the liquid pump 18 delivers the cleaning liquid in the liquid storage tank 17 into the nozzle 9). The nozzle 9 flushes the metal filter element 5. The driving component causes the metal filter element 5 to rotate axially (the servo motor 2 causes the transmission gear 8 to rotate axially through the output shaft, and the transmission gear 8 causes the metal filter element 5 to rotate axially through the driven gear 7). The metal filter element 5 is washed by the nylon brush 6, and the hot air is used to dry the metal filter element 5 in preparation for the next work. It can be seen that the sampler can automatically clean the metal filter element 5 without affecting the sampling work.

[0038] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler, characterized in that: include: A sampling pipe system for sampling flue gas and capable of reversing flow; An air supply pipe system for supplying hot air and capable of reversing flow; Two three-way pipes (3), two branches of the three-way pipe (3) are respectively connected to the sampling pipeline system and the air supply pipeline system; Two parallel sampling boxes (1), an air intake pipe (4) connected to the sampling box (1) is fixed on the outer wall of one side of the sampling box (1), and a solenoid valve is installed on the air intake pipe (4), a fixing hole is opened on the outer wall of the other side of the sampling box (1), and the remaining branch of the three-way pipe (3) is fixed in the fixing hole, and a metal filter element (5) is rotatably installed on the outer wall of the branch of the three-way pipe (3) located in the sampling box (1) through a sealing bearing, a driving component is provided inside the sampling box (1), the metal filter element (5) is connected to the driving component, and the driving component causes the metal filter element (5) to rotate axially, a nylon brush (6) in contact with the metal filter element (5) is fixed inside the sampling box (1), a nozzle (9) with a nozzle facing the metal filter element (5) is installed inside the sampling box (1), and a collecting box (10) connected to the sampling box (1) is fixed at the bottom; Two liquid delivery components respectively deliver cleaning liquid to the two spray heads (9).

2. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 1, characterized in that: The sampling pipeline system includes: A heating pipe (15) having a heating wire embedded therein; A sampling tube (16), one end of the sampling tube (16) being connected to one end of the heating tube (15); The sampling tube (16) is connected to the two three-way tubes (3).

3. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 2, characterized in that: The sampling pipeline system further comprises: a second electromagnetic reversing valve (14), and the sampling pipe (16) is connected to the two three-way pipes (3) via the second electromagnetic reversing valve (14).

4. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 1, characterized in that: The air supply piping system includes: Blower (11); An air heat exchanger (12), wherein an air supply end of the air blower (11) is connected to an air inlet end of the air heat exchanger (12); A first electromagnetic reversing valve (13), wherein the air supply end of the air heat exchanger (12) is connected to the two three-way pipes (3) via the first electromagnetic reversing valve (13).

5. The high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 1 is characterized in that: The drive components include; A servo motor (2), wherein an output shaft of the servo motor (2) is located in the sampling box (1); A driven gear (7), the driven gear (7) is coaxially fixed to the metal filter element (5); The transmission gear (8) is coaxially fixed with the output shaft of the servo motor (2), and the transmission gear (8) is meshed with the driven gear (7).

6. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 5, characterized in that: The entirety of the servo motor (2) is fixed in the sampling box (1).

7. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 1, characterized in that: The bristles of the nylon brush (6) are made of high temperature resistant nylon.

8. The high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 1, characterized in that: The liquid delivery components include: A reservoir (17) containing cleaning fluid is placed.

9. A high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to claim 8, characterized in that: The liquid delivery assembly also includes: A liquid pump (18), wherein a liquid inlet end of the liquid pump (18) is connected to the liquid storage tank (17), and a liquid delivery end of the liquid pump (18) is connected to the nozzle (9).

10. A method for sampling high-dust and high-temperature flue gas from a coal-fired boiler, characterized in that: The method is based on a high-dust and high-temperature flue gas sampling device for a coal-fired boiler according to any one of claims 1 to 9, comprising: The two air intake pipes (4) are connected to the same boiler exhaust pipe, one of the solenoid valves is opened, and the smoke enters the air sampling box (1) through the air intake pipe (4), and is filtered by the metal filter element (5). The filtered smoke enters the three-way pipe (3), and the air supply pipeline system on the three-way pipe (3) does not supply hot air. The sampling pipeline system samples the three-way pipe (3) containing the filtered smoke. After the set working time, the opened solenoid valve is closed, and the other solenoid valve is opened, and the smoke enters the other air intake pipe (4). The sampling pipe The air supply system takes samples in another three-way pipe (3), the air supply pipe system delivers hot air into the three-way pipe (3) where the hot air has been completed, the hot air backwashes the metal filter element (5) to wash away the dust particles, the liquid delivery component delivers the cleaning liquid into the nozzle (9) in the sampling box (1) where the work has been completed, the nozzle (9) flushes the metal filter element (5), the driving component causes the metal filter element 5 to rotate axially, the metal filter element (5) is washed by the nylon brush (6), and the hot air is used to dry the metal filter element (5) to wait for the next work.

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