A device assisting in flue gas measurement

Abstract

The present invention belongs to the technical field of flue gas collection, and specifically relates to a device that assists in flue gas measurement, including a front light guide, an air bleed elbow, a rear light guide, an air outlet elbow, and an air bleed pipe rod; a scale is provided on the outer wall of the air bleed pipe rod, which is used to judge the depth of the air bleed pipe rod extending horizontally from the sampling port of the annular flue; the front light guide is provided at the front end of the optical path tube, and the rear light guide is provided at the rear end of the optical path tube; a laser rangefinder can measure the front, left, and right sides of the sampling point through two reflectors and the front lens on the front side of the front light guide from three rear lenses. The structure in this solution can cooperate to realize the measurement of the front distance, left distance, and right distance of the sampling point, and then realize the measurement of the inner diameter of the flue; at the same time, because the scale is provided on the outer wall of the air bleed pipe rod, the scale can be used to judge the layout depth of the sampling point, thereby realizing the accurate layout of the sampling point.

Description

Technical Field

[0001] The invention belongs to the technical field of smoke collection, and in particular relates to a device assisting in smoke measurement. Background Art

[0002] With the development of human production and the prosperity of life, especially the development of modern industry, agriculture, and energy, the harm caused to the environment by pollutants emitted by stationary atmospheric pollution sources has become increasingly apparent. Stationary atmospheric pollution sources generally refer to fixed sources of atmospheric pollutants. The main types of pollutants include: smoke, carbon dioxide, sulfur dioxide, carbon monoxide, nitrogen oxides, fluoride, hydrogen sulfide, chlorine, hydrogen chloride, sulfuric acid and aerosols, phosphorus oxides, phenol, benzene, gasoline, mercury, lead and its compounds, arsine, cadmium, chromium and its compounds, etc.

[0003] Factories, enterprises, institutions, and the catering service industry often emit flue gases during their daily lives. With the establishment of an emissions trading system and the achievement of the "dual carbon" goals, the demand for measurement system accuracy is becoming increasingly stringent. When calculating carbon emissions from boilers in thermal power plants, steel mills, and metallurgical plants, it is often necessary to determine the location of sampling points based on the flue's inner diameter, thereby facilitating the calculation of airflow and flue gas parameters at different cross-sectional locations.

[0004] In the actual flue gas measurement process, the inner diameter of the flue is often difficult to measure. It is often obtained by consulting with on-site enterprise personnel, or by determining the length of the smoke gun crossing the flue to assist in measurement. The flue inner diameter values ​​obtained by the above two methods often have large human errors. Incorrect flue inner diameter values ​​will not guarantee the accuracy of the sampling point layout, and will also have an adverse effect on the subsequent calculation of flue gas parameters. Therefore, it is necessary to design a device that can measure the flue inner diameter during the process of arranging the sampling points. Summary of the Invention

[0005] In order to solve the problem of measurement errors and subsequent calculation errors caused by the difficulty in accurately arranging sampling points in the flue, this solution provides a device to assist in flue gas measurement.

[0006] The technical solution adopted in the present invention is:

[0007] A device assisting in flue gas measurement, comprising an air bleed assembly; the air bleed assembly comprises a front light guide, an air bleed elbow, a rear light guide, an air outlet elbow, and an air bleed pipe rod; a scale is provided on the outer wall of the air bleed pipe rod for judging the depth to which the air bleed pipe rod extends horizontally from a sampling port of an annular flue; the air bleed pipe rod comprises an optical path tube and an air path tube arranged in parallel, one above the other.

[0008] The air bleed elbow is provided at the front end of the gas pipe, and the front end of the air bleed elbow is bent toward and used to introduce the flue gas at the sampling point into the gas pipe; the air outlet elbow is provided at the rear end of the gas pipe and is used to lead the flue gas in the gas pipe out to the flue gas analyzer;

[0009] The front light guide is arranged at the front end of the optical path tube, and front lenses are respectively arranged on the front side, left side and right side of the front light guide, and reflectors are also arranged on the left and right sides of the front light guide; the rear light guide is arranged at the rear end of the optical path tube and has three rear lenses arranged side by side; the laser rangefinder can measure the front side, left side and right side of the sampling point from the three rear lenses through two reflectors and the front lens on the front side of the front light guide.

[0010] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: it also includes a groove rail assembly, which includes a fan-shaped seat and a groove rail body; the groove rail body is in the shape of a U-shaped groove, and the air bleed pipe rod can be placed in the groove rail body and slide along the length direction of the groove rail body; the fan-shaped seat is fixedly connected to the lower front part of the groove rail body, and a number of long strip holes are provided on the fan-shaped seat for fixed connection with the flange at the sampling port.

[0011] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: a C-shaped curtain is also provided at the sampling port, a notch is provided at the lower part of the C-shaped curtain, and a number of magnets are provided around the notch. The C-shaped curtain is made of soft material and is fixed to the flange at the sampling port by magnetic attraction, and cooperates with the fan-shaped seat to close the sampling port of the annular flue.

[0012] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: a supporting wheel is provided at the bottom of the groove of the groove rail body, and the supporting wheel can support the air bleed pipe rod upward; a clamping wheel assembly is detachably connected to the groove rail body, and the clamping wheel assembly can press the air bleed pipe rod downward into the groove rail body, and make the air bleed pipe rod parallel to the groove rail body during horizontal sliding.

[0013] As an alternative structure or supplementary design of the above-mentioned device assisting in smoke gas measurement: the pressing wheel assembly includes a mounting seat body, a rear arm rod, a front arm rod, a rear pressure wheel and a front pressure wheel and a telescopic support mechanism; the mounting seat body can be detachably connected to the side of the groove rail body, the rear arm rod and the front arm rod are detachably connected to the mounting seat body respectively, the rear pressure wheel is rotatably connected to the upper end of the rear arm rod and presses it downward from above the air duct rod, and the front pressure wheel is rotatably connected to the upper end of the front arm rod and presses it downward from above the air duct rod; the telescopic support mechanism is arranged between the rear arm rod and the front arm rod and is used to adjust the height of the rear pressure wheel and the front pressure wheel.

[0014] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: the telescopic support mechanism includes a rear sleeve, a double-threaded screw and a front sleeve; the front sleeve is rotatably connected to the upper end of the front arm rod, and the rear sleeve is rotatably connected to the upper end of the rear arm rod; the front and rear ends of the double-threaded screw are provided with opposite threads and are threadedly connected to the front sleeve and the rear sleeve respectively.

[0015] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: the rear pressure wheel is coaxially connected to a driven pulley, and the driven pulley can rotate synchronously with the rear pressure wheel; the driven pulley is connected to a driving pulley through a belt; the driving pulley is connected to the rotating shaft of a drive motor, and the drive motor is fixed through a motor seat under the groove rail body.

[0016] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: a tensioning wheel assembly is provided on the motor base, and the tensioning wheel assembly includes a tensioning wheel body, a slider, and a threaded adjustment rod; the slider is slidably provided on the motor base and can move away from or approach the belt; the tensioning wheel body is rotatably provided on the slider and abuts against the side of the belt; a folding ear is provided on the motor base, the middle part of the threaded adjustment rod is threadedly connected to the folding ear, and the end part of the threaded adjustment rod is rotatably connected to the slider; the position of the slider and the tensioning wheel body is controlled when the threaded adjustment rod is rotated.

[0017] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: the mounting seat body is T-shaped, and a Z-shaped buckle portion is provided at the lower part of the mounting seat body, and the Z-shaped buckle portion can be plugged into and matched with the buckle seat provided at the lower part of the groove rail body; a magnet is provided on the mounting seat body to be magnetically attracted to the outer wall of the groove rail body, so as to facilitate fixing by screws passing through the mounting seat body and the side wall of the groove rail body.

[0018] As an alternative structure or supplementary design of the above-mentioned device assisting in flue gas measurement: the annular flue is provided with sampling ports in two directions perpendicular to each other, and each sampling port is provided with a flange; the annular flue has multiple sampling points arranged in the radial direction.

[0019] The beneficial effects of the present invention are:

[0020] In this solution, the air bleed pipe rod adopts a square tube structure, so that when it is extended into the flue, it is convenient to judge the direction of the air bleed elbow, effectively ensure the accuracy of the flue gas sampling data at the sampling point, and reduce the influence of the deflection of the air bleed elbow on the flue gas sampling results; in this solution, the air bleed pipe rod includes an optical path tube, which can cooperate with the structure of the rear light guide and the front light guide to realize the transmission of laser. When the laser rangefinder is aligned with different rear lens positions of the rear light guide, it can measure the front distance, left distance and right distance of the sampling point respectively, so that the staff can realize the measurement of the inner diameter of the flue according to the measured distance value; at the same time, because the outer wall surface of the air bleed pipe rod is provided with a scale, the scale can be used to judge the layout depth of the sampling point, thereby realizing the accurate layout of the sampling point; the groove rail provided in this solution The assembly can be installed on the flange at the sampling port, and at the same time, it can effectively seal the sampling port in conjunction with the C-shaped curtain, thereby reducing the impact of air leakage at the sampling port on the accuracy of flue gas sampling; in addition, since the groove rail assembly is combined with the clamping wheel assembly, it can also assist in the radial sliding of the air bleed pipe rod, reducing the resistance during the radial sliding of the air bleed pipe rod, thereby saving manpower and reducing the difficulty of operation for personnel; when the groove rail assembly is arranged in a horizontal state, it can ensure the horizontal movement of the air bleed pipe rod, thereby reducing the impact of the vertical deflection of the air bleed pipe rod on the accuracy of flue gas measurement; the driving assembly in this scheme can drive the rear pressure wheel through a belt, so that the rear pressure wheel pushes or retracts the smoke rod through friction, and there is no need for personnel to control the radial extension and contraction position of the air bleed pipe rod, which further reduces the difficulty in the flue gas sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of this solution or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0022] Figure 1 This is a schematic diagram of the structure of the device assisting in flue gas measurement in this solution;

[0023] Figure 2 This is a diagram showing the distribution of bleed air components on the annular flue;

[0024] Figure 3 This is a diagram showing the arrangement of the front light guide and the rear light guide on the optical path tube;

[0025] Figure 4 This is a cross-sectional structural diagram of the air bleed pipe rod;

[0026] Figure 5 It is a structural diagram of the holding wheel assembly;

[0027] Figure 6 This is the structural diagram of the fan-shaped seat and the C-shaped curtain;

[0028] Figure 7This is a diagram of the matching structure of the drive assembly and the tensioner assembly.

[0029] In the figure: 1-annular flue; 11-sampling port; 2-bleed air assembly; 21-front light guide; 211-reflector; 212-front lens; 22-bleed air elbow; 23-rear light guide; 231-rear lens; 24-exhaust elbow; 25-bleed air pipe rod; 251-light path tube; 252-gas path tube; 3-groove rail assembly; 31-sector seat; 311-long strip hole; 32-buckle seat; 33-motor seat; 34-supporting wheel; 35-groove rail Main body; 4-driving assembly; 41-driving pulley; 42-tensioning pulley body; 43-slider; 44-threaded adjustment rod; 45-folding ear; 5-C-shaped curtain; 51-notch; 52-magnet; 6-tensioning pulley assembly; 61-mounting seat body; 611-Z-shaped buckle; 612-fixing hole; 62-rear arm rod; 63-driven pulley; 64-rear pressure wheel; 65-rear sleeve; 66-double-threaded screw; 67-front pressure wheel; 68-front arm rod. DETAILED DESCRIPTION

[0030] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this solution.

[0031] Example 1

[0032] like Figures 1 to 7 As shown, during the detection of flue gas parameters in the flue, the detection personnel are often required to determine the location and number of sampling points based on the inner diameter of the flue to ensure the accuracy of sampling. However, in actual detection operations, the flue inner diameter parameters are often obtained based on questions and answers with factory personnel or by using a straight rod measurement method. The flue inner diameter parameters obtained by these two methods are often different from the actual parameters, which affects the location and number of sampling points.

[0033] The annular flue is provided with sampling ports 11 in two directions perpendicular to each other, and each sampling port 11 is provided with a flange. The annular flue has multiple sampling points arranged in a radial direction.

[0034] To this end, this embodiment designs a device to assist in flue gas measurement, including an air bleed assembly 2 .

[0035] The air intake assembly 2 includes components such as a leading light guide 21, an air intake elbow 22, a trailing light guide 23, an outlet elbow 24, and an air intake pipe rod 25. The air intake pipe rod 25 is in the shape of a square pipe with a cross-section in the shape of a Chinese character 'ri', and the air intake pipe rod 25 can be formed by welding two square pipes arranged side by side, one on top of the other, and specifically includes two parts: an optical path pipe 251 and an air path pipe 252.

[0036] The air path pipe 252 is located below the optical path pipe 251. The air intake elbow 22 is welded and connected to the front end of the air path pipe 252 and is in communication with the air path pipe 252. The front end of the air intake elbow 22 is bent towards and is used to introduce the flue gas at the sampling point in the flue into the air path pipe 252. The outlet elbow 24 is arranged at the rear end of the air path pipe 252 and is also in communication with the air path pipe 252. At the outlet elbow 24, it can be connected to a flue gas analyzer such as a dust sampling gun through a hose, so as to lead the flue gas in the air path pipe 2 into the flue gas analyzer. During use, the air intake elbow 22 extends into the flue from the sampling port, and the outlet elbow 24 is placed outside the flue.

[0037] The optical tube 251 is a straight tube, the front light guide 21 is arranged at the front end of the optical tube 251, and front lenses 212 are respectively arranged on the front side, left side and right side of the front light guide 21, and reflectors 211 are also arranged on the left and right sides of the front light guide 21; the rear light guide 23 is arranged at the rear end of the optical tube 251 and has three side-by-side rear lenses 231; the laser rangefinder can measure the front side, left side and right side of the sampling point from the three rear lenses 231 through two reflectors 211 and the front lens 212 on the front side of the front light guide 21. When measuring the distance to the right side of the sampling point, when the laser rangefinder is facing the rear lens 231 on the right side of the rear light guide 23, the laser can pass through the rear lens 231 on the right side, the reflector 211 on the right side, and the front lens 212 on the right side in sequence, and be emitted in a direction perpendicular to the optical path tube 251. After diffuse reflection from the inner wall of the flue, it is reflected back to the laser rangefinder, thereby realizing distance measurement. The laser rangefinder can be a commercially available product. In actual calculation, the detection value of the laser rangefinder is used to subtract the length of the optical path tube 251. When measuring the distance to the left of the sampling point, when the laser rangefinder is facing the rear lens 231 on the left side of the rear light guide 23, the laser light can sequentially pass through the left rear lens 231, the left reflector 211, and the left front lens 212, and be emitted in a direction perpendicular to the optical tube 251. After diffuse reflection from the inner wall of the flue, it is reflected back to the laser rangefinder, thereby achieving distance measurement. In actual calculation, the length of the optical tube 251 is subtracted from the measured value of the laser rangefinder. When measuring the distance to the front of the sampling point, when the laser rangefinder is facing the rear lens 231 in the middle of the rear light guide 23, the laser light can sequentially pass through the middle rear lens 231 and the front lens 212, and be emitted in a direction parallel to the optical tube 251. After diffuse reflection from the inner wall of the flue, it is reflected back to the laser rangefinder, thereby achieving distance measurement. In actual calculation, the length of the optical tube 251 is subtracted from the measured value of the laser rangefinder.

[0038] By measuring the distance in the front, left, and right directions of the sampling point, the inner diameter of the flue can be obtained through geometric calculation, which is convenient for correcting the location and number of sampling points.

[0039] In addition, a scale is provided on the outer wall of the air bleed pipe rod 25 for judging the depth of the air bleed pipe rod 25 extending horizontally from the sampling port 11 of the annular flue 1 , thereby facilitating adjustment of the position of the front end of the air bleed pipe rod 25 .

[0040] Example 2

[0041] Based on the structure of the embodiment, a grooved rail assembly 3 is designed to facilitate the controlled radial movement of the air bleed rod 25 along the flue. The grooved rail assembly 3 includes a sector-shaped seat 31 and a grooved rail body 35. The grooved rail body 35 is in the form of a U-shaped groove, into which the air bleed rod 25 can be placed and slide along its length. When the grooved rail body 35 is fixed horizontally, the movement direction of the air bleed rod 25 can also be horizontal.

[0042] The fan-shaped seat 31 is fixedly connected to the lower front portion of the groove rail body 35. A plurality of elongated holes 311 are provided on the fan-shaped seat 31 for fixed connection with the flange at the sampling port 11. When in use, the elongated holes 311 on the fan-shaped seat 31 enable it to be compatible with flanges of various sizes, thereby facilitating the installation of the fan-shaped seat 31. A C-shaped curtain 5 is also provided at the sampling port 11. The lower portion of the C-shaped curtain 5 is provided with a notch 51, and a plurality of magnets 52 are provided around the notch 51. The C-shaped curtain 5 is made of a soft material and is magnetically fixed to the flange at the sampling port 11 by the magnets 52. The C-shaped curtain 5 cooperates with the fan-shaped seat 31 to seal the sampling port 11 of the annular flue 1, thereby reducing the impact of the open sampling port 11 on parameters such as the flue gas flow rate.

[0043] A supporting wheel 34 is provided at the bottom of the groove of the groove rail body 35, and the supporting wheel 34 can support the air bleed pipe rod 25 upward; a clamping wheel assembly 6 is detachably connected to the groove rail body 35, and the clamping wheel assembly 6 can press the air bleed pipe rod 25 downward into the groove rail body 35, and make the air bleed pipe rod 25 parallel to the groove rail body 35 during horizontal sliding. The pressing wheel assembly 6 includes a mounting body 61, a rear arm rod 62, a front arm rod 68, a rear pressure wheel 64 and a front pressure wheel and a telescopic support mechanism; the mounting body 61 can be detachably connected to the side of the groove rail body 35, and the rear arm rod 62 and the front arm rod 68 are detachably connected to the mounting body 61 respectively, the rear pressure wheel 64 is rotatably connected to the upper end of the rear arm rod 62 and presses it downward from above the air bleed pipe rod 25, and the front pressure wheel is rotatably connected to the upper end of the front arm rod 68 and presses it downward from above the air bleed pipe rod 25; the telescopic support mechanism is arranged between the rear arm rod 62 and the front arm rod 68 and is used to adjust the height of the rear pressure wheel 64 and the front pressure wheel. When in use, the rear pressure wheel 64 and the front pressure wheel are against the upper surface of the air bleed pipe rod 25.

[0044] The mounting seat body 61 is T-shaped, and a Z-shaped buckle 611 is provided at the lower part of the mounting seat body 61. The Z-shaped buckle 611 can be plugged into the buckle seat 32 provided at the lower part of the groove rail body 35. The buckle seat 32 is in a mouth shape. When in use, the Z-shaped buckle 611 is inserted into the buckle seat 32; a magnet 52 is provided on the mounting seat body 61 to be magnetically attracted to the outer wall of the groove rail body 35, so that it can be fixed by screws passing through the mounting seat body 61 and the side wall of the groove rail body 35.

[0045] The telescopic support mechanism includes a rear sleeve 65, a double-threaded screw 66, and a front sleeve. The front sleeve is rotatably connected to the upper end of the front arm 68, while the rear sleeve 65 is rotatably connected to the upper end of the rear arm 62. The front and rear ends of the double-threaded screw 66 are provided with opposite threads and are respectively threadedly connected to the front and rear sleeves 65. During use, manually rotating the double-threaded screw 66 controls the rear sleeve 65 and the front sleeve to move away from each other, thereby driving the rear arm 62 and the front arm 68 to rotate, allowing the rear pressure wheel 64 and the front pressure wheel to press against the upper surface of the air duct rod 25, ensuring that the air duct rod 25 is constrained within the groove rail body 35.

[0046] The rear pressure wheel 64 is coaxially connected to a driven pulley 63, which can rotate synchronously with the rear pressure wheel 64. The driven pulley 63 can be driven by a drive assembly 4, which includes a driving pulley 41, a drive motor, and a belt. The driven pulley 63 is connected to the driving pulley 41 via a belt. The driving pulley 41 is connected to the rotating shaft of a drive motor, and the drive motor is fixed via a motor base 33 below the groove rail body 35. When the drive motor rotates, it can drive the driven pulley 63 to rotate via the belt. The rear pressure wheel 64 rotates synchronously with the driven pulley 63 and, under the action of friction, pushes the air bleed pipe rod 25 to move horizontally. In other words, technicians only need to control the drive motor to rotate it forward or reverse to control the movement of the air bleed pipe rod 25 between different sampling points.

[0047] A tensioning pulley assembly is mounted on the motor base 33 and includes a tensioning pulley body 42, a slider 43, and a threaded adjustment rod 44. The slider 43 is slidably mounted on the motor base 33 and can be moved away from or closer to the belt. The tensioning pulley body 42 is rotatably mounted on the slider 43 and abuts against the side of the belt. A folding lug 45 is provided on the motor base 33. The middle portion of the threaded adjustment rod 44 is threadedly connected to the folding lug 45, and the end of the threaded adjustment rod 44 is rotatably connected to the slider 43. Rotating the threaded adjustment rod 44 controls the position of the slider 43 and the tensioning pulley body 42. The tensioning pulley body 42 can tension the belt, thereby ensuring the belt's force transmission and driving the driven pulley 63.

[0048] The above embodiments are merely examples for the purpose of illustrating the present invention clearly and are not intended to limit the embodiments. It is not necessary and impossible to enumerate all embodiments here. Obvious changes or modifications derived therefrom are still within the scope of protection of this technology.

Claims

1. A device for assisting in flue gas measurement, characterized in that: The invention comprises an air bleed assembly (2); the air bleed assembly (2) comprises a front light guide (21), an air bleed elbow (22), a rear light guide (23), an air outlet elbow (24) and an air bleed pipe rod (25); a scale is provided on the outer wall of the air bleed pipe rod (25) for judging the depth of the air bleed pipe rod (25) extending horizontally from the sampling port (11) of the annular flue (1); the air bleed pipe rod (25) comprises an optical path tube (251) and an air path tube (252) arranged in parallel one above the other; An air bleed elbow (22) is provided at the front end of the gas line pipe (252), the front end of the air bleed elbow (22) being bent toward and used to introduce the flue gas at the sampling point into the gas line pipe (252); the air outlet elbow (24) is provided at the rear end of the gas line pipe (252) and is used to lead the flue gas in the gas line pipe (252) out to the flue gas analyzer; The front light guide (21) is arranged at the front end of the optical path tube (251), and front lenses (212) are respectively arranged on the front side, left side and right side of the front light guide (21), and reflectors (211) are also arranged on the left side and right side of the front light guide (21); the rear light guide (23) is arranged at the rear end of the optical path tube (251), and has three rear lenses (231) arranged side by side; the laser rangefinder can measure the distance from the front side, left side and right side of the sampling point to the inner wall of the annular flue through the front lens (212) on the front side of the front light guide (21), the reflector (211) on the left side of the front light guide (21) and the reflector (211) on the right side of the front light guide (21).

2. The device for assisting in flue gas measurement according to claim 1, characterized in that: The invention also includes a groove rail assembly (3), wherein the groove rail assembly (3) includes a fan-shaped seat (31) and a groove rail body (35); the groove rail body (35) is in a U-shaped groove shape, and the air bleed pipe rod (25) can be placed in the groove rail body (35) and slide along the length direction of the groove rail body (35); the fan-shaped seat (31) is fixedly connected to the front lower part of the groove rail body (35), and a plurality of long strip holes (311) are provided on the fan-shaped seat (31) for fixed connection with the flange at the sampling port (11).

3. The device for assisting in flue gas measurement according to claim 2, characterized in that: A C-shaped curtain (5) is also provided at the sampling port (11), a notch (51) is provided at the lower portion of the C-shaped curtain (5), and a plurality of magnets (52) are provided around the notch (51). The C-shaped curtain (5) is made of a soft material and is fixed to the flange at the sampling port (11) by magnetic attraction through the magnets (52), and cooperates with the fan-shaped seat (31) to seal the sampling port (11) of the annular flue (1).

4. The device for assisting in flue gas measurement according to claim 2, characterized in that: A supporting wheel (34) is provided at the bottom of the groove of the groove rail body (35), and the supporting wheel (34) is capable of supporting the air bleed pipe rod (25) upward; a pressing wheel assembly (6) is detachably connected to the groove rail body (35), and the pressing wheel assembly (6) is capable of pressing the air bleed pipe rod (25) downward into the groove rail body (35), and making the air bleed pipe rod (25) parallel to the groove rail body (35) during horizontal sliding.

5. The device for assisting in flue gas measurement according to claim 4, characterized in that: The pressing wheel assembly (6) includes a mounting seat body (61), a rear arm rod (62), a front arm rod (68), a rear pressure wheel (64), a front pressure wheel and a telescopic support mechanism; the mounting seat body (61) can be detachably connected to the side of the groove rail body (35), the rear arm rod (62) and the front arm rod (68) are detachably connected to the mounting seat body (61), the rear pressure wheel (64) is rotatably connected to the upper end of the rear arm rod (62) and presses the air duct rod (25) downward from above, and the front pressure wheel is rotatably connected to the upper end of the front arm rod (68) and presses the air duct rod (25) downward from above; the telescopic support mechanism is arranged between the rear arm rod (62) and the front arm rod (68) and is used to adjust the height of the rear pressure wheel (64) and the front pressure wheel.

6. The device for assisting in flue gas measurement according to claim 5, characterized in that: The telescopic support mechanism comprises a rear sleeve (65), a double-threaded screw (66) and a front sleeve; the front sleeve is rotatably connected to the upper end of the front arm rod (68), and the rear sleeve (65) is rotatably connected to the upper end of the rear arm rod (62); the front and rear ends of the double-threaded screw (66) are provided with opposite threads and are respectively threadedly connected to the front sleeve and the rear sleeve (65).

7. The device for assisting in flue gas measurement according to claim 5, characterized in that: The rear pressure wheel (64) is coaxially connected to a driven pulley (63), and the driven pulley (63) can rotate synchronously with the rear pressure wheel (64); the driven pulley (63) is connected to a driving pulley (41) via a belt; the driving pulley (41) is connected to the rotating shaft of a driving motor, and the driving motor is fixed via a motor seat (33) below the groove rail body (35).

8. The device for assisting in flue gas measurement according to claim 7, characterized in that: A tension wheel assembly is provided on the motor base (33), and the tension wheel assembly includes a tension wheel body (42), a slider (43), and a threaded adjustment rod (44); the slider (43) is slidably provided on the motor base (33) and can move away from or close to the belt; the tension wheel body (42) is rotatably provided on the slider (43) and abuts against the side of the belt; a folding ear (45) is provided on the motor base (33), the middle part of the threaded adjustment rod (44) is threadedly connected to the folding ear (45), and the end of the threaded adjustment rod (44) is rotatably connected to the slider (43); when the threaded adjustment rod (44) is rotated, the positions of the slider (43) and the tension wheel body (42) are controlled.

9. The device for assisting in flue gas measurement according to claim 5, characterized in that: The mounting seat body (61) is T-shaped, and a Z-shaped buckle portion (611) is provided at the lower portion of the mounting seat body (61), and the Z-shaped buckle portion (611) can be plugged into and matched with a buckle seat (32) provided at the lower portion of the groove rail body (35); a magnet (52) is provided on the mounting seat body (61) to be magnetically attracted to the outer wall of the groove rail body (35) so as to facilitate fixing by screws passing through the mounting seat body (61) and the side wall of the groove rail body (35).

10. The device for assisting in flue gas measurement according to claim 1, characterized in that: The annular flue is provided with sampling ports (11) in two directions perpendicular to each other, and each sampling port (11) is provided with a flange. The annular flue has a plurality of sampling points arranged in a radial direction.

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