Denitration outlet flue gas sampling device for coal-fired power plant

Abstract

The invention discloses a coal-fired power plant denitration outlet flue gas sampling device, and relates to the technical field of flue gas sampling detection device design, the coal-fired power plant denitration outlet flue gas sampling device comprises an installation detection frame, a grid sampling unit, an ash removal anti-clogging unit and a collection detection unit, the installation detection frame is provided with the collection detection unit, the collection detection unit is provided with the grid sampling unit, and the grid sampling unit is provided with the ash removal anti-clogging unit. A sampling pipeline on the grid sampling unit is connected with a flue, the ash removing and blocking preventing unit comprises a power motor, a sealing ring, a sealing circular plate and an extending pipeline, a collecting pipe in the grid sampling unit is provided with a circular hole, the interior of the circular hole is rotationally connected with a rotating cylinder through a bearing, sampling can be carried out at multiple points, and the sampling efficiency is improved. Detection data is more accurate, in the flue gas circulation process, pipeline blockage is prevented, flue gas circulation is not affected, dust in flue gas can be treated, and detection sampling use is not affected.

Description

Technical Field

[0001] This invention relates to the field of flue gas sampling and detection device design technology, specifically a flue gas sampling device for the denitrification outlet of a coal-fired power plant. Background Technology

[0002] Coal combustion is one of the world's main energy sources. Coal-fired power plants consume large amounts of coal, and the combustion of coal produces a large amount of flue gas. This flue gas contains a large amount of carbon dioxide, carbon monoxide, nitrogen oxides, sulfur dioxide, and other components, which inevitably disrupts the atmospheric balance and causes air and environmental pollution. Although different coal-fired power plants may use different equipment and coal types, and therefore the amount of flue gas emitted may vary, the rated evaporation capacity of coal-fired power plants is large. Therefore, compared with other industrial production, the amount of flue gas emitted is significantly higher. When emitting flue gas, a large amount of heat is released, resulting in very high temperatures in the surrounding environment. To avoid the harm caused by high temperatures, coal-fired power plants must use tall chimneys to vent the flue gas. The rising of the flue gas further increases its diffusion range and transmission distance, exacerbating the harmful effects of the flue gas.

[0003] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials (such as coal) as fuel to produce electricity. Its basic production process is as follows: when fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then, the turbine drives the generator to rotate, converting the mechanical energy into electrical energy. During the power generation process, a large amount of flue gas is generated. In order to protect the environment, it is necessary to detect and analyze the generated flue gas.

[0004] Existing flue gas sampling devices at the denitrification outlet of coal-fired power plants can only sample a single type of gas, which can easily lead to inaccurate detection. During the flue gas flow process, the pipes are easily blocked, affecting the flow of flue gas and making it impossible to treat the dust in the flue gas, thus affecting the detection and sampling. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a sampling device for flue gas at the denitrification outlet of a coal-fired power plant. This device can sample at multiple points, resulting in more accurate detection data. During the flue gas flow process, it prevents pipe blockage and does not affect the flow of flue gas. It can also treat the dust in the flue gas without affecting the detection and sampling. This device can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sampling device for flue gas from the denitrification outlet of a coal-fired power plant, comprising a mounting and testing frame, a grid sampling unit, a dust removal and anti-clogging unit, and a collection and testing unit;

[0007] The installation and testing frame is equipped with a collection and testing unit, which is equipped with a grid sampling unit. The sampling pipe on the grid sampling unit is connected to the flue.

[0008] The dust removal and anti-clogging unit includes a power motor, a sealing ring, a sealing disc, and an extension pipe. A circular hole is formed in the manifold of the grid sampling unit. A rotating cylinder is rotatably connected to the manifold through a bearing. One end of the rotating cylinder is located inside the manifold. The outer end of the rotating cylinder is fixedly connected to the output shaft of the power motor. The power motor is fixedly connected to the manifold through a motor support frame. A sealing disc is fixedly fitted onto the rotating cylinder inside the manifold. The sealing disc is movably connected within the manifold. A sealing ring is fixedly fitted onto the left and right sides of the sealing disc on the inner surface of the manifold. The end of the manifold closest to the sealing disc is fixedly engaged with one end of the extension pipe. The input end of the power motor is electrically connected to the output end of an external power supply through an external control switch group.

[0009] The mounting frame is used to fix the testing device; the collection and testing unit is used for testing; the grid sampling unit is used for multi-point sampling; the power motor is used to provide power to move the sealing disc; the sealing disc seals the inside of the manifold; when the sealing disc is opened, high-pressure gas flows through to clean the inner wall and remove dust; the extension pipe is used to extend the service life and facilitate cleaning; and the sealing ring is used to seal and make the sealing disc seal more stable, thus achieving the sealing function.

[0010] Furthermore, the dust removal and anti-clogging unit also includes an air compressor housing and an air compressor. The other end of the extension pipe is fixedly connected to the air compressor housing. The air compressor housing is fixedly connected to the air compressor through a support frame. The air blowing hole on the air compressor corresponds to the sealing circular plate. The air inlet on the air compressor is connected to the outside through a pipe passing through the air compressor housing. The input end of the air compressor is electrically connected to the output end of an external power supply through an external control switch group.

[0011] The air compressor mounting housing is used to fix the air compressor, which is used to blow air to clean the dust on the inner wall of the pipes and prevent pipe blockage.

[0012] Furthermore, the dust removal and anti-clogging unit also includes a dust collection box, a circular slide rail, a sealing arc plate, and fastening bolts. A dust collection hole is provided at the end of the manifold in the grid sampling unit away from the sealing circular plate. A circular slide rail is fixedly sleeved on the outside of the manifold at the left and right sides of the dust collection hole, and a sealing arc plate is slidably sleeved between the two circular slide rails. The sealing arc plate is sealed and snapped into the dust collection hole. The sealing arc plate is fixedly snapped into the manifold by fastening bolts. A dust collection box is provided on the outside of the two circular slide rails. A rectangular hole is provided on the dust collection box at the front and rear sides of the manifold.

[0013] The dust collection box is used to collect dust for centralized processing. The circular slide rail is used to make the movement of the sealing arc plate more stable. The sealing arc plate is used to fix the dust collection hole for fixation when not collecting dust. The fastening bolts are used to fix the sealing arc plate to the manifold for easy fixation and dust collection.

[0014] Furthermore, the dust removal and anti-clogging unit also includes auxiliary sliding columns, with an auxiliary sliding column rotatably connected to each of the two rectangular holes on the dust collection box, and the two auxiliary sliding columns contacting the sealing arc plate.

[0015] The auxiliary sliding column is used to make the movement of the sealing arc plate more stable, and to facilitate the auxiliary opening of the sealing arc plate for dust collection.

[0016] Furthermore, the grid sampling unit also includes a sampling probe support frame, a sampling pipe, a sampling probe, and a control valve. Multiple probe support frames are installed inside the flue, and a sampling pipe is fixedly attached to each probe support frame. The upper end of each sampling pipe passes through the upper side of the corresponding flue, and a sampling probe is fixedly attached to the lower end of each sampling pipe at a position inside the flue. Each sampling probe samples a mesh structure, and a control valve is installed on each sampling pipe at a position outside the flue.

[0017] The probe support frame is used to fix the sampling pipe, the sampling pipe is used to fix the sampling probe, the sampling probe is used to collect flue gas for sampling, the sampling probe is used to filter larger impurities to prevent pipe blockage, and the control valve is used to control the flow of flue gas in a single sampling pipe for easy adjustment and control for sampling and collection.

[0018] Furthermore, the grid sampling unit also includes a return pipe support frame, a manifold, and a probe connector. Two equally spaced return pipe support frames are provided on the flue. A manifold is provided on each of the two return pipe support frames. Multiple probe connectors are provided on the manifold. Each probe connector is connected to the upper end of a corresponding sampling pipe. All sampling pipes extend into the manifold.

[0019] The return pipe support frame is used to fix the manifold. The return pipe support frame is of different heights to allow the manifold to tilt at a certain angle, preventing dust blockage and facilitating flue gas flow. The probe connector is used to connect to the sampling pipe for convenient sampling.

[0020] Furthermore, the grid sampling unit also includes a second control valve, which is located on the manifold away from the sealing disc.

[0021] Control valve 2 is used to control the flow of flue gas in the manifold, making it convenient for control.

[0022] Furthermore, the collection and detection unit includes a collection and detection box, a rectangular fixed cover, an exhaust pipe, a denitrification outlet flue gas analyzer, and a filter plate. A collection and detection box is fixedly connected to the upper surface of the mounting and detection frame. A rectangular fixed cover is provided on the collection and detection box, and a flue gas outlet is provided on the rectangular fixed cover. An exhaust pipe is provided inside the flue gas outlet. A denitrification outlet flue gas analyzer is provided on the rear side of the collection and detection box. The detection probe of the denitrification outlet flue gas analyzer extends into the collection and detection box. A flue gas inlet is provided on the right side of the collection and detection box, and a filter plate is provided inside the flue gas inlet. The input terminal of the denitrification outlet flue gas analyzer is electrically connected to the output terminal of an external power supply through an external control switch group.

[0023] The collection and testing box is used for collection and testing, the rectangular fixing cover is used for fixing and sealing, the exhaust pipe is used to discharge the flue gas after testing, the denitrification outlet flue gas analyzer is used for analysis and testing, and the filter screen is used for filtration to prevent dust from affecting the test results.

[0024] Furthermore, the collection and detection unit also includes an electrostatic precipitator, a connecting pipe, and a flow detection sensor. An electrostatic precipitator is installed on the upper surface of the mounting frame, located on the right side of the collection and detection box. The smoke inlet of the electrostatic precipitator is fixedly connected to one end of the connecting pipe. The other end of the connecting pipe is connected to a manifold via an expansion joint. A flow detection sensor is installed on the connecting pipe, and the detection head of the flow detection sensor extends into the connecting pipe. The smoke outlet of the electrostatic precipitator is connected to one end of a circular pipe, and the other end of the circular pipe is connected to the edge of the smoke inlet on the left side of the collection and detection box. The input end of the electrostatic precipitator is electrically connected to the output end of an external power supply via an external control switch group.

[0025] The electrostatic precipitator is a miniature electrostatic precipitator used for dust removal, achieving dust separation and facilitating testing. Connecting pipes allow flue gas to circulate, facilitating filtration testing. A flow sensor is used to detect the flow rate of the flue gas, making testing convenient.

[0026] Furthermore, the collection and detection unit also includes a display panel mounting bracket and a control display panel. A display panel mounting bracket is provided on the front side of the collection and detection box on the detection rack, and a control display panel is provided on the display panel mounting bracket.

[0027] The display panel mounting bracket is used to fix the control display panel, which is used to control and display data for operation.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The flue gas sampling device at the denitrification outlet of this coal-fired power plant has the following advantages: It is equipped with a dust removal and anti-clogging unit, powered by a motor to move a sealing disc. The sealing disc seals the inside of the manifold. When the sealing disc is opened, high-pressure gas flows through to clean the inner wall and remove dust. An extension pipe extends the service life and facilitates cleaning. A sealing ring ensures a more stable seal. An air compressor mounting housing secures the air compressor, which blows air to clean the dust from the inner wall of the pipe. A dust collection box collects dust for centralized processing. A circular slide rail stabilizes the movement of the sealing arc plate. The sealing arc plate is used to fix the dust collection hole for secure installation when not collecting dust. Fastening bolts secure the sealing arc plate to the manifold. An auxiliary sliding column stabilizes the movement of the sealing arc plate and facilitates opening the sealing arc plate for dust removal.

[0030] 2. The flue gas sampling device at the denitrification outlet of this coal-fired power plant has the following advantages: It is equipped with a grid sampling unit. A probe support frame is used to fix the sampling pipe, which is used to fix the sampling probe. The sampling probe is used to collect flue gas for sampling. The sampling probe is used to filter larger impurities to prevent pipe blockage. Control valve one is used to control the flue gas flow in a single sampling pipe. A return pipe support frame is used to fix the manifold. The return pipe support frame is at different heights to tilt the manifold at a certain angle to prevent dust blockage and facilitate flue gas flow. A probe connector is used to connect the sampling pipe. Control valve two is used to control the flue gas flow in the manifold for grid sampling.

[0031] 3. The flue gas sampling device at the denitrification outlet of this coal-fired power plant has the following advantages: it allows for sampling at multiple points, resulting in more accurate detection data; it prevents pipe blockage during flue gas flow and does not affect flue gas flow; and it can treat dust in the flue gas without affecting the detection and sampling. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0034] Figure 3 This is a schematic diagram of a partial structure of the sampling pipeline of the present invention;

[0035] Figure 4 This is a schematic diagram of the front cross-sectional structure of the manifold of the present invention;

[0036] Figure 5 This is a partial cross-sectional view of the dust removal and anti-clogging unit of the present invention;

[0037] Figure 6 This is a schematic diagram of the circular slide rail installation structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the dust collection mechanism of the present invention;

[0039] Figure 8 This is a cross-sectional view of the detection box of the present invention.

[0040] In the diagram: 1. Installation and testing frame; 2. Flue; 3. Grid sampling unit; 31. Sampling probe support frame; 32. Sampling pipe; 33. Sampling probe; 34. Control valve one; 35. Return pipe support frame; 36. Manifold; 37. Control valve two; 38. Probe connector; 4. Dust removal and anti-clogging unit; 41. Power motor; 42. Sealing ring; 43. Sealing circular plate; 44. Extension pipe; 45. Air compressor mounting shell; 46. Air compressor; 47. Dust collection box; 48. Circular slide rail; 49. Sealing arc plate; 410. Auxiliary slide column; 411. Fastening bolt; 5. Collection and detection unit; 51. Collection and detection box; 52. Rectangular fixing cover; 53. Exhaust pipe; 54. Denitrification outlet flue gas analyzer; 55. Filter screen; 56. Electrostatic precipitator; 57. Connecting pipe; 58. Flow detection sensor; 59. Display panel mounting frame; 510. Control display panel. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figure 1-8 This embodiment provides a technical solution: a sampling device for flue gas from the denitrification outlet of a coal-fired power plant, including a mounting and testing frame 1, a grid sampling unit 3, a dust removal and anti-clogging unit 4, and a collection and testing unit 5;

[0043] The installation of the testing frame 1 is equipped with a collection and testing unit 5, and a grid sampling unit 3 is installed on the collection and testing unit 5. The sampling pipe 32 on the grid sampling unit 3 is connected to the flue 2.

[0044] The dust removal and anti-clogging unit 4 includes a power motor 41, a sealing ring 42, a sealing disc 43, and an extension pipe 44. A circular hole is opened on the manifold 36 in the grid sampling unit 3. A rotating cylinder is rotatably connected to the manifold 36 via a bearing. One end of the rotating cylinder is located inside the manifold 36. The position on the rotating cylinder at the outer end of the manifold 36 is fixedly connected to the output shaft of the power motor 41. The power motor 41 is fixedly connected to the manifold 36 via a motor support frame. A sealing disc 43 is fixedly sleeved on the rotating cylinder at the position inside the manifold 36. The sealing disc 43 is movably connected within the manifold 36. A sealing ring 42 is fixedly sleeved on the inner surface of the manifold 36 at the left and right sides of the sealing disc 43. One end of the manifold 36 near the sealing disc 43 is fixedly snapped into one end of the extension pipe 44. The input end of the power motor 41 is electrically connected to the output end of an external power supply via an external control switch group.

[0045] The mounting frame 1 is used to fix the testing device, the collection and testing unit 5 is used for testing, the grid sampling unit 3 is used for multi-point sampling, the power motor 41 is used to provide power to move the sealing disc 43, the sealing disc 43 seals the inside of the manifold 36, and when the sealing disc 43 is opened, high-pressure gas flows through to clean the inner wall and remove dust. The extension pipe 44 is used to extend the use and facilitate cleaning. The sealing ring 42 is used to seal and make the sealing disc 43 seal more stable, thus achieving the sealing function.

[0046] The dust removal and anti-clogging unit 4 also includes an air compressor housing 45 and an air compressor 46. The other end of the extension pipe 44 is fixedly connected to the air compressor housing 45. The air compressor housing is fixedly connected to the air compressor 46 through a support frame. The air blowing hole on the air compressor 46 corresponds to the sealing circular plate 43. The air inlet on the air compressor 46 is connected to the outside through a pipe passing through the air compressor housing 45. The input end of the air compressor 46 is electrically connected to the output end of the external power supply through an external control switch group.

[0047] The air compressor mounting housing 45 is used to fix the air compressor 46. The air compressor 46 is used to blow air to clean the dust on the inner wall of the pipe and prevent the pipe from becoming blocked.

[0048] The dust removal and anti-clogging unit 4 also includes a dust collection box 47, a circular slide rail 48, a sealing arc plate 49, and fastening bolts 411. A dust collection hole is provided at the end of the manifold 36 in the grid sampling unit 3 away from the sealing circular plate 43. A circular slide rail 48 is fixedly sleeved on the outside of the manifold 36 on the left and right sides of the dust collection hole, respectively. A sealing arc plate 49 is slidably sleeved between the two circular slide rails 48. The sealing arc plate 49 is sealed and snapped into the dust collection hole. The sealing arc plate 49 is fixedly snapped into the manifold 36 by fastening bolts 411. A dust collection box 47 is provided on the outside of the two circular slide rails 48. A rectangular hole is provided on the dust collection box 47 on the front and rear sides of the manifold 36.

[0049] The dust collection box 47 is used to collect dust for centralized processing. The circular slide rail 48 is used to make the movement of the sealing arc plate 49 more stable. The sealing arc plate 49 is used to fix the dust collection hole for fixing when not collecting dust. The fastening bolt 411 is used to fix the sealing arc plate 49 to the manifold 36 for easy fixing and dust collection.

[0050] The dust removal and anti-clogging unit 4 also includes auxiliary sliding columns 410. One auxiliary sliding column 410 is rotatably connected to each of the two rectangular holes on the dust collection box 47, and the two auxiliary sliding columns 410 are in contact with the sealing arc plate 49.

[0051] The auxiliary slide 410 is used to make the movement of the sealing arc plate 49 more stable, and to facilitate the auxiliary opening of the sealing arc plate 49 for dust collection.

[0052] The grid sampling unit 3 also includes a sampling probe support frame 31, a sampling pipe 32, a sampling probe 33, and a control valve 34. Multiple probe support frames 31 are installed inside the flue 2. A sampling pipe 32 is fixedly attached to each probe support frame 31. The upper end of each sampling pipe 32 passes through the upper side of the corresponding flue 2. A sampling probe 33 is fixedly attached to the lower end of each sampling pipe 32 at a position inside the flue 2. Each sampling probe 33 samples the mesh structure. A control valve 34 is installed on each sampling pipe 32 at a position outside the flue 2.

[0053] The probe support frame 31 is used to fix the sampling pipe 32, the sampling pipe 32 is used to fix the sampling probe 33, the sampling probe 33 is used to collect flue gas for sampling, the sampling probe 33 is used to filter larger impurities to prevent pipe blockage, and the control valve 34 is used to control the flow of flue gas in a single sampling pipe 32 for easy adjustment and control for sampling and collection.

[0054] The grid sampling unit 3 also includes a return pipe support frame 35, a manifold 36, and a probe connector 38. Two equally spaced return pipe support frames 35 are provided on the flue 2. A manifold 36 is provided on the two return pipe support frames 35. Multiple probe connectors 38 are provided on the manifold 36. Each probe connector 38 is connected to the upper end of the corresponding sampling pipe 32. All sampling pipes 32 extend into the manifold 36.

[0055] The return pipe support bracket 35 is used to fix the manifold 36. The return pipe support bracket 35 is at different heights to tilt the manifold 36 at a certain angle to prevent dust blockage and facilitate flue gas flow. The probe connector 38 is used to connect to the sampling pipe for convenient sampling.

[0056] The grid sampling unit 3 also includes a control valve 37, which is located on the manifold 36 at a position away from the sealing disc 43.

[0057] Control valve 2 37 is used to control the flow of flue gas in the manifold 36, making it convenient for control.

[0058] The collection and detection unit 5 includes a collection and detection box 51, a rectangular fixing cover 52, an exhaust pipe 53, a denitrification outlet flue gas analyzer 54, and a filter screen 55. A collection and detection box 51 is fixedly connected to the upper surface of the mounting frame 1. A rectangular fixing cover 52 is provided on the collection and detection box 51, and a flue gas outlet is provided on the rectangular fixing cover 52. An exhaust pipe 53 is provided inside the flue gas outlet. A denitrification outlet flue gas analyzer 54 is provided on the rear side of the collection and detection box 51. The detection probe on the denitrification outlet flue gas analyzer 54 extends into the collection and detection box 51. A flue gas inlet is provided on the right side of the collection and detection box 51, and a filter screen 55 is provided inside the flue gas inlet. The input terminal of the denitrification outlet flue gas analyzer 54 is electrically connected to the output terminal of an external power supply through an external control switch group.

[0059] The collection and testing box 51 is used for collection and testing, the rectangular fixing cover 52 is used for fixing and sealing, the exhaust pipe 53 is used to discharge the flue gas after testing, the denitrification outlet flue gas analyzer 54 is used for analysis and testing, and the filter screen 55 is used for filtration to prevent dust from affecting the test results.

[0060] The collection and detection unit 5 also includes an electrostatic precipitator 56, a connecting pipe 57, and a flow detection sensor 58. An electrostatic precipitator 56 is installed on the upper surface of the mounting frame 1 at the right side of the collection and detection box 51. The smoke inlet of the electrostatic precipitator 56 is fixedly connected to one end of the connecting pipe 57. The other end of the connecting pipe 57 is connected to the manifold 36 via an expansion joint. A flow detection sensor 58 is installed on the connecting pipe 57. The detection head of the flow detection sensor 58 extends into the connecting pipe 57. The smoke outlet of the electrostatic precipitator 56 is connected to one end of a round pipe. The other end of the round pipe is connected to the edge of the smoke inlet on the left side of the collection and detection box 51. The input end of the electrostatic precipitator 56 is electrically connected to the output end of an external power supply via an external control switch group.

[0061] The electrostatic precipitator 56 is a miniature electrostatic precipitator used for dust removal to separate smoke and dust for easy detection. The connecting pipe 57 is used to allow the flue gas to circulate for easy filtration and detection. The flow sensor 58 is used to detect the flow rate of the flue gas for easy detection.

[0062] The collection and detection unit 5 also includes a display panel mounting bracket 59 and a control display panel 510. A display panel mounting bracket 59 is provided on the front side of the collection and detection box 51 on the detection rack 1, and a control display panel 510 is provided on the display panel mounting bracket 59.

[0063] The display panel mounting bracket 59 is used to fix the control display panel 510, which is used to control and display data for operation.

[0064] The working principle of the flue gas sampling device at the denitrification outlet of a coal-fired power plant provided by this invention is as follows: First, a probe support frame 31 is used to fix the sampling pipe 32, the sampling pipe 32 is used to fix the sampling probe 33, the sampling probe 33 is used to collect flue gas for sampling, the sampling probe 33 is used to filter larger impurities to prevent pipe blockage, a control valve 34 is used to control the flue gas flow in a single sampling pipe 32, a return pipe support frame 35 is used to fix the manifold 36, the return pipe support frame 35 is at different heights to tilt the manifold 36 at a certain angle to prevent dust blockage and facilitate flue gas flow, the probe... Connector 38 is used to connect the sampling pipeline; control valve 37 is used to control the flow of flue gas in the manifold 36; then, it is collected and used through the collection and detection box 51 for convenient testing; rectangular fixing cover 52 is used for fixing and sealing; exhaust pipe 53 is used to discharge the tested flue gas; denitrification outlet flue gas analyzer 54 is used for analysis and detection; filter screen 55 is used for filtration; electrostatic precipitator 56 is a miniature electrostatic precipitator for dust removal to achieve flue gas separation for convenient testing; connecting pipe 57 is used to allow flue gas to flow for convenient filtration and testing. The flow detection sensor 58 is used to detect the flow rate of flue gas. The display panel bracket 59 is used to fix the control display panel 510. The control display panel 510 is used to control and display data for detection purposes. When not in use, the power motor 41 provides power to move the sealing disc 43. The sealing disc 43 seals the inside of the manifold 36. When the sealing disc 43 is opened, high-pressure gas flows through to clean the inner wall and remove dust. The extension pipe 44 is used to extend the service life and facilitate cleaning. The sealing ring 42 is used for sealing, allowing the sealing disc 43 to... The sealing is more stable. The air compressor mounting housing 45 is used to fix the air compressor 46. The air compressor 46 is used to blow air for purging to clean the dust on the inner wall of the pipeline. The dust collection box 47 is used to collect dust for centralized treatment. The circular slide rail 48 is used to make the movement of the sealing arc plate 49 more stable. The sealing arc plate 49 is used to fix the dust collection hole for fixation when not collecting dust. The fastening bolt 411 is used to fix the sealing arc plate 49 to the manifold 36. The auxiliary slide column 410 is used to make the movement of the sealing arc plate 49 more stable for removing dust and facilitating pipeline blockage.

[0065] It is worth noting that the core chip of the external control switch group disclosed in the above embodiments is a PLC microcontroller, the power motor 41 is a stepper motor, and the external control switch group controls the power motor 41, air compressor 46, denitrification outlet flue gas analyzer 54, electrostatic precipitator 56 and control display board 510 using methods commonly used in the prior art.

[0066] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A sampling device for flue gas at the denitrification outlet of a coal-fired power plant, characterized in that: It includes a testing frame (1), a grid sampling unit (3), a dust removal and anti-clogging unit (4), and a collection and testing unit (5); The installation of the testing rack (1) is provided with a collection and testing unit (5), and the collection and testing unit (5) is provided with a grid sampling unit (3), and the sampling pipe (32) on the grid sampling unit (3) is connected to the flue (2); Dust removal and anti-clogging unit (4): includes a power motor (41), a sealing ring (42), a sealing disc (43), and an extension pipe (44). A circular hole is provided on the manifold (36) in the grid sampling unit (3). The circular hole is rotatably connected to a rotating cylinder through a bearing. One end of the rotating cylinder is set inside the manifold (36). The position on the rotating cylinder at the outer end of the manifold (36) is fixedly connected to the output shaft of the power motor (41). The power motor (41) is fixed to the manifold (36) through a motor support frame. A sealing disc (43) is fixedly fitted onto the rotating cylinder at a position inside the manifold (36). The sealing disc (43) is movably connected inside the manifold (36). A sealing ring (42) is fixedly fitted onto the inner surface of the manifold (36) at the left and right sides of the sealing disc (43). One end of the manifold (36) near the sealing disc (43) is fixedly snapped into one end of the extension pipe (44). The input end of the power motor (41) is electrically connected to the output end of the external power supply through an external control switch group.

2. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 1, characterized in that: The dust removal and anti-clogging unit (4) also includes an air compressor housing (45) and an air compressor (46). The other end of the extension pipe (44) is fixedly connected to the air compressor housing (45). The air compressor housing is fixedly connected to the air compressor (46) through a support frame. The air blowing hole on the air compressor (46) corresponds to the sealing disc (43). The air inlet on the air compressor (46) is connected to the outside through a pipe passing through the air compressor housing (45). The input end of the air compressor (46) is electrically connected to the output end of the external power supply through an external control switch group.

3. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 1, characterized in that: The dust removal and anti-clogging unit (4) also includes a dust collection box (47), a circular slide rail (48), a sealing arc plate (49), and fastening bolts (411). A dust collection hole is provided at one end of the manifold (36) in the grid sampling unit (3) away from the sealing circular plate (43). A circular slide rail (48) is fixedly sleeved on the outside of the manifold (36) on the left and right sides of the dust collection hole. A sealing arc plate (49) is slidably sleeved between the two circular slide rails (48). The sealing arc plate (49) is sealed and snapped with the dust collection hole. The sealing arc plate (49) is fixedly snapped with the manifold (36) by fastening bolts (411). A dust collection box (47) is provided on the outside of the two circular slide rails (48). A rectangular hole is provided on the dust collection box (47) on the front and rear sides of the manifold (36).

4. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 3, characterized in that: The dust removal and anti-clogging unit (4) also includes auxiliary sliding columns (410). Two rectangular holes on the dust collection box (47) are respectively connected to an auxiliary sliding column (410), and the two auxiliary sliding columns (410) are in contact with the sealing arc plate (49).

5. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 1, characterized in that: The grid sampling unit (3) also includes a sampling probe support frame (31), a sampling pipe (32), a sampling probe (33), and a control valve (34). Multiple probe support frames (31) are provided in the flue (2). A sampling pipe (32) is fixedly attached to each probe support frame (31). The upper end of each sampling pipe (32) passes through the upper side of the corresponding flue (2). A sampling probe (33) is fixedly attached to the lower end of each sampling pipe (32) at the position inside the flue (2). Each sampling probe (33) samples the mesh structure. A control valve (34) is provided on each sampling pipe (32) at the position outside the flue (2).

6. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 5, characterized in that: The grid sampling unit (3) also includes a return pipe support frame (35), a manifold (36) and a probe connector (38). Two equally spaced return pipe support frames (35) are provided on the flue (2). A manifold (36) is provided on the two return pipe support frames (35). Multiple probe connectors (38) are provided on the manifold (36). Each probe connector (38) is connected to the upper end of the corresponding sampling pipe (32). All sampling pipes (32) extend into the manifold (36).

7. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 6, characterized in that: The grid sampling unit (3) also includes a second control valve (37), which is located on the manifold (36) away from the sealing disc (43).

8. The sampling device for denitrification outlet flue gas of a coal-fired power plant according to claim 1, characterized in that: The collection and detection unit (5) includes a collection and detection box (51), a rectangular fixed cover (52), an exhaust pipe (53), a denitrification outlet flue gas analyzer (54), and a filter plate (55). A collection and detection box (51) is fixedly connected to the upper surface of the mounting and detection frame (1). A rectangular fixed cover (52) is provided on the collection and detection box (51). A smoke exhaust port is provided on the rectangular fixed cover (52). An exhaust pipe (53) is provided inside the smoke exhaust port. A denitrification outlet flue gas analyzer (54) is provided on the rear side of the collection and detection box (51). The detection probe on the denitrification outlet flue gas analyzer (54) extends into the collection and detection box (51). A smoke inlet is opened on the right side of the collection and detection box (51). A filter plate (55) is provided inside the smoke inlet. The input end of the denitrification outlet flue gas analyzer (54) is electrically connected to the output end of an external power supply through an external control switch group.

9. A sampling device for denitrification outlet flue gas in a coal-fired power plant according to claim 8, characterized in that: The collection and detection unit (5) also includes an electrostatic precipitator (56), a connecting pipe (57), and a flow detection sensor (58). An electrostatic precipitator (56) is installed on the upper surface of the mounting frame (1) at the right side of the collection and detection box (51). The smoke inlet of the electrostatic precipitator (56) is fixedly connected to one end of the connecting pipe (57). The other end of the connecting pipe (57) is connected to the manifold (36) through an expansion joint. A flow detection sensor (58) is installed on the connecting pipe (57). The detection head of the flow detection sensor (58) extends into the connecting pipe (57). The smoke outlet of the electrostatic precipitator (56) is connected to one end of a round pipe. The other end of the round pipe is connected to the edge of the smoke inlet on the left side of the collection and detection box (51). The input end of the electrostatic precipitator (56) is electrically connected to the output end of an external power supply through an external control switch group.

10. A sampling device for denitrification outlet flue gas in a coal-fired power plant according to claim 8, characterized in that: The collection and detection unit (5) also includes a display panel holder (59) and a control display panel (510). The display panel holder (59) is located on the front side of the collection and detection box (51) on the detection rack (1), and the control display panel (510) is provided on the display panel holder (59).

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