A detection and calibration device for a smoke aerosol photometer

Abstract

The present invention discloses a detection and calibration device for a flue gas aerosol photometer, which comprises: a flue gas aerosol generating mechanism for generating aerosol; a mixing cylinder extending in a vertical direction, wherein a flue gas inlet of the mixing cylinder is connected to the flue gas aerosol generating mechanism; a bent pipe, wherein an inlet of the bent pipe is connected to a flue gas outlet of the mixing cylinder; and a discharge pipe extending in a horizontal direction, wherein an inlet of the discharge pipe is connected to an outlet of the bent pipe; at least two sampling ports are provided on the mixing cylinder, and the at least two sampling ports are arranged at the same horizontal height; and based on the relationship between the Reynolds number and the inner diameter of the mixing cylinder and the movement law of the aerosol in the mixing cylinder, the vertical distance between the sampling ports and the flue gas inlet is measured and calculated; practice shows that the detection and calibration device of the present invention has the advantages of high detection efficiency, good detection accuracy and good detection stability.

Description

Technical Field

[0001] The invention relates to the technical field of smoke aerosol concentration detection, and in particular to a detection and calibration device for a smoke aerosol photometer. Background Art

[0002] PAO-4 aerosol is a challenging aerosol specifically designed for leak testing of HEPA filters. Its CAS (US Chemical Substance Registration Number) is 68649-12-7, and its chemical composition is 1-Decene tetramer mixed with 1-decene. (The Chinese equivalent is hydrogenated 1-decene tetramer.) The stock solution concentration is 100%. PAO is non-toxic, odorless, insoluble in water, and non-volatile. The US FDA recommends PAO as an alternative to DOP for HEPA filter testing.

[0003] Currently, PAO-4 aerosol concentrations are typically measured using a photometer. However, these instruments require calibration after leaving the factory or after a period of use, which can lead to inaccurate results. Calibration requires a stable, high-quality flue gas source, and the standard instrument and the device under test must be protected from drying by external factors to avoid inaccurate calibration results. However, there is currently no commercially available device that can rapidly calibrate the device under test, particularly a photometer for PAO-4 aerosols. Summary of the Invention

[0004] The object of the present invention is to overcome one or more deficiencies of the prior art and to provide a detection and calibration device for a flue gas aerosol photometer having high detection efficiency, good detection accuracy and good detection stability.

[0005] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a detection and calibration device for a flue gas aerosol photometer, the detection and calibration device comprising:

[0006] A smoke aerosol generating mechanism, used for generating aerosol;

[0007] a mixing cylinder extending in a vertical direction, wherein a smoke inlet of the mixing cylinder is connected to the smoke aerosol generating mechanism;

[0008] an elbow, the inlet of which is connected to the smoke outlet of the mixing cylinder;

[0009] a discharge pipe extending in a horizontal direction, wherein an inlet of the discharge pipe is connected to an outlet of the elbow;

[0010] Wherein, at least two sampling ports are provided on the mixing cylinder, and the at least two sampling ports are arranged at the same horizontal height;

[0011] The vertical distance between the sampling port and the flue gas inlet is obtained by the following method:

[0012] (1) For a specific aerosol, make the aerosol flow state in the mixing cylinder laminar state, and use formula (I) to calculate the required inner diameter of the mixing cylinder;

[0013] d = (Re × η) / (ρ × v) (I), v, ρ, and η are the flow rate, density, and dynamic viscosity coefficient of the aerosol fluid, respectively; d is the inner diameter of the mixing cylinder; and Re is the Reynolds number, which is controlled to be less than 2000.

[0014] (2) The middle position of the smoke inlet of the mixing cylinder is used as the starting point of the aerosol moving into the mixing cylinder. Through simulation, the angle between the line connecting the aerosol from the starting point to the intersection with the inner wall of the mixing cylinder and the vertical direction is obtained as θ. h represents the vertical distance between the sampling port and the smoke inlet. Formula (II) is used to calculate h, h = d / (2tanθ) (II);

[0015] Combine formula (I) and formula (II) to obtain h.

[0016] According to some preferred and specific aspects of the present invention, Re is 1500-1800.

[0017] According to a specific aspect of the present invention, the aerosol is PAO-4 aerosol.

[0018] According to a specific and preferred aspect of the present invention, when the aerosol is PAO-4 aerosol, θ is 5°-6°.

[0019] According to some preferred aspects of the present invention, the detection and calibration device further includes a first filter provided on the mixing cylinder and an exhaust fan connected to the outlet of the exhaust pipe.

[0020] According to some preferred aspects of the present invention, the distance between the bottom of the first filter and the sampling port is 100-200 mm.

[0021] According to some preferred aspects of the present invention, the detection and calibration device further includes a second filter, and the outlet of the exhaust pipe is connected to the exhaust fan through the second filter.

[0022] According to some preferred aspects of the present invention, the detection and calibration device also includes a shell, and the smoke aerosol generating mechanism, the mixing cylinder, the bent pipe, the exhaust pipe, the exhaust fan, and the second filter are respectively arranged in the shell, and the upper end of the mixing cylinder extends upward from the shell, and the first filter is located outside the shell.

[0023] According to some preferred aspects of the present invention, the smoke aerosol generating mechanism is arranged above the exhaust fan.

[0024] According to some preferred aspects of the present invention, the detection and calibration device further comprises an oil collecting tank for collecting aerosol condensed liquid, and the oil collecting tank is arranged in the shell and below the exhaust pipe.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] The present invention provides a device for rapid testing by directly generating aerosols using a smoke aerosol generator, and then simultaneously sampling a standard device and a device to be tested from the aerosols. However, in practice, it has been found that when using the aerosol generator to generate aerosols, if the initial concentration is too low, losses will occur during the transmission process, which may make it difficult for a photometer to detect the aerosols, or even result in inaccurate detection. Therefore, when using the aerosol generator to prepare aerosols, the initial aerosol concentration is set to a high level. However, when the high aerosol is in the transmission pipeline, direct sampling, on the one hand, requires a high range of the photometer, and most photometers may not be able to reach the high range, reducing universality. On the other hand, direct sampling, because the aerosol is already in the pipeline, requires simultaneous sampling of the photometer to be tested and calibrated and the standard photometer to ensure accuracy. However, simultaneous sampling means that sampling cannot be performed at the same sampling port. Different sampling ports are prone to inconsistent concentrations of high-concentration aerosols initially dispersed in the transmission pipeline, which further causes detection and calibration failure.

[0027] Based on the above problems, the inventors of the present invention have conducted further research and innovatively proposed that by setting a vertical mixing cylinder, the high-concentration aerosol produced by the aerosol generating mechanism can travel a certain distance in the mixing cylinder, and in the process, it can be mixed with the naturally existing or actively input dilution gas (such as air), which can actively reduce the concentration and facilitate the detection and calibration of the photometer. In addition, due to the space requirements, the overall structure of the device needs to be compact, so the aerosol needs to be reversed in the pipeline, and the reversal requires the use of an elbow. This operation will inevitably cause turbulence when the aerosol runs in the pipeline, causing mixing. In order to prevent the aerosol from getting worse in the mixing process, the inventors further proposed that in order to keep the aerosol running stably during the mixing process, that is, to keep the laminar flow state as much as possible when running in the mixing cylinder, the size of the mixing cylinder and the position of the sampling port need to be specially designed. The inventors innovatively based on the relationship between the Reynolds number and the inner diameter of the mixing cylinder and the movement law of the aerosol in the mixing cylinder, so that the sampling port can be located where the high-concentration aerosol is fully dispersed, diluted and mixed, and can avoid being affected by the turbulence at the bend, thereby ensuring the accuracy of the test results. Moreover, the method can be applied to photometers of all ranges, has strong universality, fast detection speed and high detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention 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. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the structure of a detection and calibration device for a flue gas aerosol photometer according to an embodiment of the present invention;

[0030] Figure 2 This is a second structural diagram of the detection and calibration device of the flue gas aerosol photometer according to an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of a method for calculating the vertical distance between the sampling port and the smoke inlet in a detection and calibration device for a smoke aerosol photometer according to an embodiment of the present invention;

[0032] In the accompanying drawings: 1. Smoke aerosol generating mechanism; 2. Mixing cylinder; 21. Smoke inlet; 22. Standard table sampling port; 23. Sampling port of the device to be tested; 3. Bend pipe; 4. Discharge pipe; 5. First filter; 6. Exhaust fan; 7. Second filter; 8. Housing; 81. Standard table adapter; 82. Device to be tested adapter; 9. Oil collecting tank; 10. Control system; 11. Universal wheel. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar modifications without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0038] There is no rapid detection and calibration device for photometers in the prior art, especially no device that directly generates aerosols (especially PAO-4 aerosols) using a smoke aerosol generating mechanism to trace the aerosol concentration value, making it difficult to quickly detect and calibrate the photometer. The present invention provides a device that directly generates aerosols using a smoke aerosol generating mechanism, and then simultaneously samples the aerosols from the standard table and the device to be tested for rapid detection. However, it has been found in practice that when using an aerosol generating mechanism to generate aerosols, if the initial concentration is too low, loss will occur during the transmission process, which may make it difficult for the photometer to detect the aerosol or even result in inaccurate detection. Therefore, When an aerosol generator is used to prepare aerosols, the initial aerosol concentration is relatively high. However, when a relatively high aerosol is in the transmission pipeline, if direct sampling is performed, on the one hand, a relatively high range is required for the photometer, and most photometers may not be able to reach the high range, reducing universality. On the other hand, direct sampling requires that the aerosol is already in the pipeline, and the photometer to be tested and calibrated and the standard photometer must be sampled simultaneously to ensure accuracy. However, simultaneous sampling means that sampling cannot be performed at the same sampling port. Different sampling ports are prone to inconsistent concentrations for high-concentration aerosols initially dispersed in the transmission pipeline, which will further cause failure of detection and calibration.

[0039] Based on the above problems, the inventors of the present invention have conducted further research and innovatively proposed that by setting a vertical mixing cylinder, the high-concentration aerosol produced by the aerosol generating mechanism can travel a certain distance in the mixing cylinder, and in the process, it can be mixed with the naturally existing or actively input dilution gas (such as air), which can actively reduce the concentration and facilitate the detection and calibration of the photometer. In addition, due to the space requirements, the overall structure of the device needs to be compact, so the aerosol needs to be reversed in the pipeline, and the reversal requires the use of an elbow. This operation will inevitably cause turbulence when the aerosol runs in the pipeline, causing mixing. In order to prevent the aerosol from getting worse in the mixing process, the inventors further proposed that in order to keep the aerosol running stably during the mixing process, that is, to keep the laminar flow state as much as possible when running in the mixing cylinder, the size of the mixing cylinder and the position of the sampling port need to be specially designed. The inventors innovatively based on the relationship between the Reynolds number and the inner diameter of the mixing cylinder and the movement law of the aerosol in the mixing cylinder, so that the sampling port can be located where the high-concentration aerosol is fully dispersed, diluted and mixed, and can avoid being affected by the turbulence at the bend, thereby ensuring the accuracy of the test results. Moreover, the method can be applied to photometers of all ranges, has strong universality, fast detection speed and high detection efficiency.

[0040] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] like Figures 1 to 3As shown, this example provides a detection and calibration device for a flue gas aerosol photometer, which includes a flue gas aerosol generating mechanism 1 for generating aerosol, a mixing cylinder 2, a bent pipe 3, an exhaust pipe 4, a first filter 5, an exhaust fan 6, a second filter 7, and a shell 8.

[0042] Specifically, the mixing cylinder 2 extends in the vertical direction, and the smoke inlet 21 of the mixing cylinder 2 is connected to the smoke aerosol generating mechanism 1, so that the aerosol can be directly introduced;

[0043] The inlet of the bent pipe 3 is connected to the smoke outlet of the mixing cylinder 2;

[0044] The discharge pipe 4 extends horizontally, and an inlet of the discharge pipe 4 is connected to an outlet of the elbow 3 .

[0045] Furthermore, if Figure 1 As shown, the mixing cylinder 2, the curved pipe 3, and the exhaust pipe 4 form a roughly "L-shape". This arrangement is mainly to reduce the space occupied and facilitate the integrated arrangement of various components in a smaller space; the mixing cylinder 2, the curved pipe 3, the exhaust pipe 4, the second filter 7, and the exhaust fan 6 are connected in sequence, and the smoke aerosol generating mechanism 1 can be arranged above the exhaust fan 6.

[0046] In this example, some connecting pipes are omitted. These connecting pipes can be connecting hoses. For example, the direct connecting pipe between the smoke aerosol generating mechanism 1 and the smoke inlet 21 is omitted, but it does not affect the connection between the various components of the device. It only needs to be connected when needed.

[0047] Generally speaking, in order to improve the accuracy of detection calibration, it is necessary to have a standard device, that is, a device whose measurement accuracy is accurate, which in this case can be an aerosol photometer for measuring aerosol concentration, and a device to be detected, that is, an aerosol photometer to be detected; the standard aerosol photometer and the aerosol photometer to be detected need to be connected to a sampling port respectively to achieve simultaneous sampling. Only in this way can the errors of sampling at different time periods be avoided as much as possible. However, based on the above analysis, it can be seen that since the initial aerosol concentration entering the mixing cylinder is relatively high, if sampling is performed directly, the range requirements for the aerosol photometer are extremely high and the universality is not strong, and the aerosol needs to be dispersed and diluted. However, how to ensure that the aerosol is fully and evenly dispersed when sampling is not solved by the existing technology. The following will describe in detail the arrangement of the sampling ports, which are key to this device. Specifically, at least two sampling ports are provided on the mixing cylinder 2, and the at least two sampling ports are provided at the same level. In this example, a standard table sampling port 22 and a device-to-be-tested sampling port 23 are provided.

[0048] The vertical distance between the sampling port and the flue gas inlet 21 is obtained by the following method:

[0049] (1) For a specific aerosol, the flow state of the aerosol in the mixing cylinder 2 is made laminar, and the required inner diameter of the mixing cylinder 2 is calculated using formula (I);

[0050] d = (Re × η) / (ρ × v) (I), v, ρ, and η are the flow rate, density, and dynamic viscosity coefficient of the aerosol fluid, respectively; d is the inner diameter of the mixing cylinder 2; and Re is the Reynolds number, which is controlled to be less than 2000.

[0051] Formula (I) can be used to directly calculate the appropriate inner diameter of the mixing cylinder 2 after the aerosol type is determined, and the Reynolds number can be adjusted as needed to obtain the most appropriate inner diameter size. For example, when the aerosol is PAO-4, the Reynolds number Re can be 1500-1800. The flow rate, density, and dynamic viscosity coefficient of other aerosol fluids can be set, calculated, or found in reference books.

[0052] (2) The middle position of the smoke inlet 21 of the mixing cylinder 2 is used as the starting point for the aerosol to move into the mixing cylinder 2. Through simulation, it is obtained that the angle between the line connecting the aerosol from the starting point to the intersection with the inner wall of the mixing cylinder 2 and the vertical direction is θ, and h represents the vertical distance between the sampling port and the smoke inlet 21 (a rough schematic diagram can be shown as follows Figure 3 As shown), h is calculated using formula (Ⅱ), h=d / (2tanθ)(Ⅱ);

[0053] Combine formula (I) and formula (II) to obtain h;

[0054] In this step, the inventor uses simulation to obtain the angle between the line connecting the aerosol when it freely falls from the starting point to the intersection with the inner wall of the mixing cylinder 2 and the vertical direction. The reason for choosing the intersection of the aerosol particles with the inner wall of the mixing cylinder 2 after free fall as the sampling port is that, on the one hand, it indicates that the aerosol sent from the middle position has been fully diffused to all parts of the mixing cylinder 2, and the mixing cylinder 2 itself passively contains dilution gas such as air. Of course, other inert gases such as nitrogen can also be actively selected. In the process of diffusion, they must have been diluted and dispersed. After dilution, it can be convenient for detection by a small-scale aerosol photometer. Measurement calibration can also help to evenly disperse the aerosol; on the other hand, if the sampling port continues to be selected downward, since it continues downward and gets closer to the elbow 3, there will inevitably be turbulence at the elbow 3, which will affect the uniformity of internal dispersion, so it is not the best choice, and if it is infinitely far away, it will inevitably cause an increase in the space occupied, which is not conducive to reducing the volume of the device. Then, the intersection of the simulated free fall and the inner wall of the mixing cylinder is an ideal position, which indicates that the aerosol has been fully diffused and dispersed, and at this time, it is only necessary to maintain a certain distance from the elbow 3 to reduce or even avoid the influence of the turbulence of the elbow 3 on the dispersion of the aerosol;

[0055] According to simulation, when the aerosol is PAO-4 aerosol, θ is 5°-6°, the average of multiple operations is about 5.5°, d is about 100mm, and h is calculated to be about 520mm.

[0056] Of course, in other embodiments, other media may be used to emit aerosols of different concentrations and particle sizes for calibration testing.

[0057] Furthermore, in this example, the first filter 5 is arranged at the air inlet at the upper end of the mixing cylinder 2, which is used to filter the dilution gas entering the mixing cylinder 2, reduce the interference of impurities in the air on the detection results, and also reduce the impact of the flow of external dilution gas entering on the internal air flow of the mixing cylinder 2. The exhaust fan 6 is connected to the outlet of the exhaust pipe 4, which can provide the intake power of the dilution gas and also help the movement of the aerosol in the pipeline.

[0058] Specifically, the distance between the bottom of the first filter 5 and the sampling port is 100-200 mm. Such an arrangement can help the first filter 5 to fully exert its filtering and cleaning function.

[0059] Furthermore, if Figure 1As shown, the outlet of the discharge pipe 4 is connected to the exhaust fan 6 through the second filter 7. This arrangement allows the mixing cylinder 2 to be sandwiched between the two filters, ensuring a clean inlet and outlet state, reducing external airflow interference, reducing external pollution, and making the internal airflow stable and uniform, making the test results more accurate and repeatable, and also increasing the service life of the fan.

[0060] Specifically, see again Figure 1 The smoke aerosol generating mechanism 1, the mixing cylinder 2, the bent pipe 3, the exhaust pipe 4, the exhaust fan 6, and the second filter 7 are respectively arranged in the shell 8, and the upper end of the mixing cylinder 2 extends upward from the shell 8. The first filter 5 is located outside the shell 8. The detection and calibration device also includes an oil collecting tank 9 for collecting aerosol condensed liquid. The oil collecting tank 9 is arranged in the shell 8 and below the exhaust pipe 4 to prevent the oil mist from condensing and contaminating the bottom of the device.

[0061] In this example, the detection and calibration device also includes a universal wheel 11 set at the bottom of the shell 8, which allows the entire device to move freely and is easy to push and transfer; at the same time, in this example, a control system 10, a standard table conversion interface 81, and a device to be tested conversion interface 82 are also set on the shell 8. The control system 10 is used to communicate with the smoke aerosol generating mechanism 1, the exhaust fan 6, etc. to realize automatic control and remote control, and the standard table conversion interface 81 is connected to the standard table sampling port 22 on the mixing cylinder 2, and is used to transfer the sampled aerosol to the set standard table aerosol photometer for detection, and the device to be tested conversion interface 82 is connected to the sampling port 23 of the device to be tested on the mixing cylinder 2, and is used to transfer the sampled aerosol to the set aerosol photometer to be tested for detection, so that simultaneous detection is achieved and the detection results on the photometer can be observed intuitively.

[0062] In summary, the detection and calibration device of the present invention is applicable to photometers of almost all measuring ranges, has strong universality, and has fast detection speed and high detection efficiency.

[0063] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A detection and calibration device for a flue gas aerosol photometer, characterized in that: The detection and calibration device includes: A smoke aerosol generating mechanism, used for generating aerosol; a mixing cylinder extending in a vertical direction, wherein a smoke inlet of the mixing cylinder is connected to the smoke aerosol generating mechanism; an elbow, the inlet of which is connected to the smoke outlet of the mixing cylinder; a discharge pipe extending in a horizontal direction, wherein an inlet of the discharge pipe is connected to an outlet of the elbow; Wherein, at least two sampling ports are provided on the mixing cylinder, and the at least two sampling ports are arranged at the same horizontal height; The vertical distance between the sampling port and the flue gas inlet is obtained by the following method: (1) For a specific aerosol, make the aerosol flow state in the mixing cylinder laminar state, and use formula (I) to calculate the required inner diameter of the mixing cylinder; d = (Re × η) / (ρ × v) (I), v, ρ, and η are the flow rate, density, and dynamic viscosity coefficient of the aerosol fluid, respectively; d is the inner diameter of the mixing cylinder; and Re is the Reynolds number, which is controlled to be less than 2000. (2) The middle position of the smoke inlet of the mixing cylinder is used as the starting point of the aerosol moving into the mixing cylinder. Through simulation, the angle between the line connecting the aerosol from the starting point to the intersection with the inner wall of the mixing cylinder and the vertical direction is obtained as θ. h represents the vertical distance between the sampling port and the smoke inlet. Formula (II) is used to calculate h, h = d / (2tanθ) (II); Combine formula (I) and formula (II) to obtain h.

2. The detection and calibration device for a flue gas aerosol photometer according to claim 1, characterized in that: Re is 1500-1800.

3. The detection and calibration device for a flue gas aerosol photometer according to claim 1, characterized in that: The aerosol is PAO-4 aerosol.

4. The detection and calibration device for a flue gas aerosol photometer according to claim 3, characterized in that: When the aerosol is PAO-4 aerosol, θ is 5°-6°.

5. The detection and calibration device for a flue gas aerosol photometer according to claim 1, characterized in that: The detection and calibration device also includes a first filter arranged on the mixing cylinder and an exhaust fan connected to the outlet of the exhaust pipe.

6. The detection and calibration device for a flue gas aerosol photometer according to claim 5, characterized in that: The distance between the bottom of the first filter and the sampling port is 100-200 mm.

7. The detection and calibration device for a flue gas aerosol photometer according to claim 5, characterized in that: The detection and calibration device also includes a second filter, and the outlet of the exhaust pipe is connected to the exhaust fan through the second filter.

8. The detection and calibration device for a flue gas aerosol photometer according to claim 7, characterized in that: The detection and calibration device also includes a shell, and the smoke aerosol generating mechanism, the mixing cylinder, the bent pipe, the exhaust pipe, the exhaust fan, and the second filter are respectively arranged in the shell, and the upper end of the mixing cylinder extends upward from the shell, and the first filter is located outside the shell.

9. The detection and calibration device for a flue gas aerosol photometer according to claim 8, characterized in that: The smoke aerosol generating mechanism is arranged above the exhaust fan.

10. The detection and calibration device for a flue gas aerosol photometer according to claim 8, characterized in that: The detection and calibration device also includes an oil collecting tank for collecting aerosol condensed liquid. The oil collecting tank is arranged in the shell and is located below the discharge pipe.

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