Probe pre-filtering device and flue gas analysis monitoring system

Abstract

The embodiment of the present application discloses a probe pre-filtering device and a flue gas analysis monitoring system with the same. The pre-filtering device comprises a main gas path, a side gas path and a filtering assembly. The main gas path has a gas inlet and a gas outlet arranged oppositely along the axial direction of the main gas path. The gas inlet is used for communicating with a flue, and the gas outlet is used for communicating with a monitoring and analyzing device. The side gas path is communicated between the gas inlet and the gas outlet of the main gas path, so as to guide the flue gas in the flue to flow through the side gas path. The filtering assembly is arranged in the side gas path. Therefore, the pre-filtering device according to the embodiment of the present application has the advantages of long service life, high flue gas analysis accuracy and less possibility of blocking the probe.

Description

Technical Field

[0001] This invention relates to the field of gas monitoring technology, specifically to a pre-filter device for a probe and a flue gas analysis and monitoring system having the pre-filter device. Background Technology

[0002] In the production processes of mines, thermal power plants, steel mills, cement plants, and chemical plants, various gases that are extremely harmful to human health and the environment are generated. To ensure people's safety and improve their quality of life, gas monitoring has become an indispensable means. Sampling probes are mainly used in online flue gas monitoring. Water vapor and coal tar gas in the sample gas can turn into liquids and tar due to temperature changes, which can clog sampling pipelines and reduce the accuracy and lifespan of monitoring instruments.

[0003] In related technologies, the sampling probe's gas path channel is a pipe structure and is a straight main gas path. It has no filtering effect on particulate matter in the dust-laden airflow. Sulfides will enter the micropores in gaseous or misty form and crystallize into solid particles inside the filter, causing frequent blockage due to crystal precipitation. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a pre-filter device for a probe. This pre-filter device has the advantages of long service life, resistance to probe clogging, and high accuracy in flue gas analysis.

[0005] Embodiments of the present invention also propose a flue gas analysis and monitoring system.

[0006] The pre-filter device of the probe in this embodiment of the invention includes a main air path, a bypass air path, and a filter assembly.

[0007] The main air passage has an air inlet and an exhaust outlet arranged opposite to each other along its axial direction. The air inlet is used to communicate with the flue, and the exhaust outlet is used to communicate with the monitoring and analysis device. The bypass air passage is connected between the air inlet and the exhaust outlet of the main air passage to guide the flue gas flow through the bypass air passage. The filter assembly is disposed in the bypass air passage.

[0008] The pre-filter device of the probe in this embodiment of the invention adds a bypass gas path to the original main gas path, so that the flue gas flows through the bypass gas path before entering the monitoring and analysis device. This increases the length of the gas flow channel, allowing water vapor and coal tar gas in the flue gas to condense as much as possible in the bypass gas path, thus preventing the problem of dust- and tar-containing flue gas flowing through and clogging the main gas path.

[0009] Furthermore, the filter components installed in the bypass gas path filter out fine dust and crystals in the flue gas. This further reduces the content of solid particles in the flue gas and the dust adhering to the probe, thus improving the accuracy of flue gas analysis and extending the service life of the monitoring and analysis device.

[0010] Therefore, the pre-filter of the probe in this embodiment of the invention has the advantages of long service life, high flue gas analysis accuracy, and less clogging of the probe.

[0011] In some embodiments, the main air passage includes a main cylinder and a clearing rod disposed within the main cylinder, the clearing rod being movably disposed within the main cylinder to clear any blockages in the air inlet.

[0012] In some embodiments, a backflushing device is also included, which is connected between the exhaust port and the smoke outlet of the bypass air passage.

[0013] In some embodiments, the main cylinder is provided with a first air port and a second air port, the first air port and the second air port being located on the peripheral wall of the main cylinder at a position between the air inlet and the exhaust port, the smoke inlet of the bypass air passage being connected to the first air port, and the smoke outlet of the bypass air passage being connected to the second air port to form a bypass air passage.

[0014] In some embodiments, the air inlet of the main cylinder has a constricted assembly portion that passes through the flue, and the unclogging rod is movably disposed at the unclogging rod protrusion along the axial direction of the main cylinder.

[0015] In some embodiments, the pre-filter of the probe further includes an opening and closing gate, which has a convertible open state and a closed state. In the closed state, the flue gas of the filter flows sequentially through the air inlet, the bypass air passage, and the exhaust port.

[0016] In some embodiments, the opening / closing door panel includes a movable plate and a fixed plate. The fixed plate is connected to the inner wall of the main cylinder, and the movable plate is connected to the unblocking rod so that the opening / closing door panel can switch between the open state and the closed state as the unblocking rod moves.

[0017] In some embodiments, the bypass air path includes a zigzag-shaped cylinder, the filter assembly includes a fixing plate and a filter media layer, the fixing plate is disposed inside the zigzag-shaped cylinder, and the filter media layer is disposed inside the fixing plate.

[0018] In some embodiments, there are multiple filter media layers and fixing plates, with multiple filter media layers disposed on the fixing plate, and the fixing plate being staggered along the extension direction of the zigzag cylindrical body.

[0019] In some embodiments, the filter assembly includes a first filter assembly and a second filter assembly, wherein the first filter assembly is disposed near the air inlet and the second filter assembly is disposed near the exhaust outlet.

[0020] In some embodiments, the filter media layer is in the shape of a juniper leaf.

[0021] In some embodiments, the filter media layer is a fluorosilicone filter media layer.

[0022] In some embodiments, the filter media layer is formed by a plurality of soft and inclined needle-like protrusions, the angle between the needle-like protrusions and the extending direction of the zigzag cylindrical body is 30°-50°, and the spacing between adjacent needle-like protrusions is 5mm-8mm.

[0023] In some embodiments, the filter assembly further includes a flexible filter layer disposed between the exhaust port of the bypass gas path and the exhaust port of the main gas path to filter particulate matter in the flue gas.

[0024] In some embodiments, the filtration assembly further includes a ceramic filter element disposed between the exhaust port and the monitoring and analysis device.

[0025] In some embodiments, the flexible filter layer is a fluorosilicone filter media layer.

[0026] In some embodiments, the filtration assembly further includes an adsorption coating disposed on the surface of the flexible filter layer.

[0027] The flue gas analysis and monitoring system of this invention includes a monitoring and analysis device and a pre-filter according to any one of the above-mentioned methods, wherein the exhaust port of the main gas path is connected to the monitoring and analysis device to monitor the components in the flue gas. Attached Figure Description

[0028] Figure 1 This is a perspective view of a pre-filter device according to an embodiment of the present invention.

[0029] Figure 2 This is a front view of the pre-filter device according to an embodiment of the present invention.

[0030] Figure 3 This is a top view of the pre-filter device according to an embodiment of the present invention.

[0031] Figure 4 yes Figure 3 Along the cross-sectional view of AA, the pre-filter is in a non-coking state.

[0032] Figure 5 yes Figure 3Along the cross-sectional view of AA, the pre-filter is in the coking state.

[0033] Figure 6 This is a perspective view of the filtering component according to an embodiment of the present invention.

[0034] Figure 7 This is a perspective view of the first filtering component according to an embodiment of the present invention.

[0035] Figure 8 This is a perspective view of the second filtering component according to an embodiment of the present invention.

[0036] Figure 9 This is a perspective view of the unblocking rod and the opening / closing door panel according to an embodiment of the present invention.

[0037] Figure label:

[0038] Pre-filter 100;

[0039] Main air passage 1; main cylinder 11; air inlet 111; exhaust port 112; first air inlet 113; second air inlet 114; assembly part 115; unblocking rod 12;

[0040] Bypass gas passage 2; zigzag-shaped cylinder 21;

[0041] Filter assembly 3; First filter assembly 31; Second filter assembly 32; Fixing plate 311; Filter media layer 312; Ceramic filter element 33; Flexible filter layer 34;

[0042] 4. Opening / closing door panel; 41. Moving panel; 42. Fixed panel. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] The following is for reference. Figures 1-9 The pre-filter device 100 of the probe and the flue gas analysis and monitoring system of the present invention are described in an embodiment of the present invention.

[0045] The pre-filter device 100 of the probe in this embodiment of the invention includes a main air path 1, a bypass air path 2, and a filter assembly 3.

[0046] The main air passage 1 has an air inlet 111 and an exhaust outlet 112 arranged opposite to each other along its axial direction. The air inlet 111 is used to communicate with the flue, and the exhaust outlet 112 is used to communicate with the monitoring and analysis device. The bypass air passage 2 is connected between the air inlet 111 and the exhaust outlet 112 of the main air passage 1 so as to guide the flue gas flow through the bypass air passage 2. The filter assembly 3 is arranged in the bypass air passage 2.

[0047] The pre-filter device 100 of the probe in this embodiment of the invention adds a bypass gas path 2 to the original main gas path 1. The flue gas flowing in from the flue passes through the bypass gas path 2 before entering the monitoring and analysis device for detection and analysis. The bypass gas path 2 increases the length of the gas flow channel, thereby allowing water vapor and coal tar gas in the flue gas to condense as much as possible within the bypass gas path 2, preventing the dust- and tar-containing flue gas from clogging the main gas path 1. Furthermore, it eliminates the need to dismantle the original main gas path 1. Therefore, it has the advantage of low construction cost.

[0048] Furthermore, the filter assembly 3 installed in the bypass gas path 2 can filter out fine dust and crystals in the flue gas. This further reduces the content of solid particles in the flue gas and the dust adhering to the probe. Consequently, it has the advantages of improving the accuracy of flue gas analysis and extending the service life of the monitoring and analysis device.

[0049] Therefore, the pre-filter device 100 of the probe in this embodiment of the invention has the advantages of long service life, high flue gas analysis accuracy and less clogging of the probe.

[0050] Specifically, the probe of the monitoring and analysis device extends from the exhaust port 112 into the main air passage 1.

[0051] like Figure 4 , Figure 5 and Figure 9 As shown, the main air passage 1 includes a main cylinder 11 and a clearing rod 12 disposed inside the main cylinder 11. The clearing rod 12 is movably disposed inside the main cylinder 11 to clear the blocked air inlet 111.

[0052] The pre-filter device 100 of the probe in this embodiment of the invention prevents the accuracy of the monitoring and analysis device from being affected by the accumulation of particles and tar in the flue gas at the air inlet 111. This is achieved by including a main cylinder 11 and a clearing rod 12 disposed within the main cylinder 11 in the main gas path 1, and by movably disposing the clearing rod 12 within the main cylinder 11 to clear any blockages. For example, Figure 5 As shown, the dredging rod 12 is used for slag removal.

[0053] The pre-filter 100 of the probe also includes a backflushing device (not shown), which is connected between the exhaust port 112 and the smoke outlet of the bypass air passage 2.

[0054] The pre-filter 100 of the probe in this embodiment of the invention can reverse the gas flow through a backflushing device, thereby blowing out some of the gas dust condensed in the main gas path 1 and the bypass gas path 2. This has the advantage of extending the service life of the filter assembly 3. Furthermore, it can also, to some extent, prevent blockage at the air inlet 111 from affecting the flue gas intake rate and analysis accuracy.

[0055] like Figure 4 and Figure 5 As shown, the main cylinder 11 has a first air port 113 and a second air port 114 on its peripheral wall located between the air inlet 111 and the exhaust port 112. The smoke inlet of the bypass air passage 2 is connected to the first air port 113, and the smoke outlet of the bypass air passage 2 is connected to the second air port 114 to form the bypass air passage 2 passage.

[0056] The pre-filter device 100 of the probe in this embodiment of the invention connects the bypass air passage 2 to the peripheral wall of the main cylinder 11 located between the air inlet 111 and the exhaust port 112. This provides the advantage of a simple structure.

[0057] Furthermore, the cylinder body and the bypass air passage 2 are assembled via a flange. This provides the advantage of high assembly convenience.

[0058] like Figure 4 and Figure 5 As shown, the air inlet 111 of the main cylinder 11 has a constricted assembly part 115, which is inserted through the flue. The unblocking rod 12 is movably arranged along the axial direction of the main cylinder 11.

[0059] The pre-filter device 100 of the probe in this embodiment of the invention has a constricted assembly part 115 provided in the main cylinder 11. This provides the advantage of facilitating the connection and sealing of the main cylinder 11 with the flue.

[0060] Specifically, the assembly part 115 is radially inserted into the flue.

[0061] like Figure 4 , Figure 5 and Figure 9 As shown, the pre-filter 100 also includes an opening and closing door plate 4, which has a convertible open state and a closed state. In the closed state, the flue gas of the filter device flows sequentially through the air inlet 111, the bypass air passage 2 and the exhaust port 112.

[0062] The pre-filter device 100 of the probe in this embodiment of the invention can control the flow direction of flue gas through the provided opening and closing gate 4. When the opening and closing gate 4 is in the closed state, the flue gas of the filter device flows sequentially through the air inlet 111, the bypass air passage 2, and the exhaust port 112. Therefore, all the flue gas can pass through the filter assembly 3. This has the advantage of further improving the filtration effect of the flue gas.

[0063] like Figure 4 and Figure 9 As shown, the opening and closing door panel 4 includes a movable plate 41 and a fixed plate 42. The fixed plate 42 is connected to the inner wall of the main cylinder 11, and the movable plate 41 is connected to the unblocking rod 12 so that the opening and closing door panel 4 can switch between the open state and the closed state as the unblocking rod 12 moves.

[0064] The pre-filter device 100 of the probe in this embodiment of the invention divides the opening and closing door plate 4 into a movable plate 41 and a fixed plate 42. The movable plate 41 is connected to the unblocking rod 12 so that the opening and closing door plate 4 can switch between the open and closed states as the unblocking rod 12 moves. Therefore, it has the advantages of simple structure and high ease of operation.

[0065] Specifically, the main cylinder 11 is cylindrical, and both the movable plate 41 and the fixed plate 42 are semi-circular plates.

[0066] like Figures 1 to 5 As shown, the bypass air passage 2 includes a zigzag-shaped cylinder 21, and the filter assembly 3 includes a fixing plate 311 and a filter medium layer 312. The fixing plate 311 is disposed inside the zigzag-shaped cylinder 21, and the filter medium layer 312 is disposed inside the fixing plate 311.

[0067] The pre-filter 100 of the probe in this embodiment of the invention, through the bypass air passage 2 including a zigzag-shaped cylindrical body 21, can further increase the length of the gas flow channel. This further prevents particulate matter in the dust-laden airflow from clogging the main air passage 1.

[0068] Optionally, the bypass air passage 2 can be S-shaped, U-shaped, or serpentine in structure.

[0069] like Figure 1 and Figure 6 As shown, there are multiple filter media layers 312 and fixing plates 311, and the multiple filter media layers are staggered along the extension direction of the zigzag cylindrical body 21.

[0070] The pre-filter device 100 of the probe in this embodiment of the invention can further improve the efficiency of flue gas filtration by providing multiple filter media layers 312 and fixing plates 311. This further prevents particulate matter in the dust-laden airflow from clogging the main air passage 1.

[0071] Furthermore, by staggering the filter media layer along the extension direction of the zigzag cylinder 21, the flue gas travel distance can be increased while maintaining smooth flue gas flow, thereby improving the filtration effect of the filter media layer 312. For specific flue gas flow direction, please refer to... Figure 6 and Figure 7 The direction the arrow points.

[0072] like Figure 4 and Figure 5 As shown, the filter assembly 3 includes a first filter assembly 31 and a second filter assembly 32. The first filter assembly 31 is close to the air inlet 111, and the second filter assembly 32 is close to the exhaust outlet 112.

[0073] The pre-filter device 100 of the probe in this embodiment of the invention, through the provision of a first filter component 31 and a second filter component 32, has a secondary filtration effect. The secondary filtration can effectively reduce particulate matter in the sample gas, extend the service life of the secondary filter element, and further improve the filtration effect of the filter component 3 on the flue gas.

[0074] like Figure 1 and Figure 6 As shown, the filter media layer 312 is in the shape of a juniper leaf. Specifically, the juniper leaf includes a matrix and needle-like layers disposed on both sides of the matrix in the thickness direction.

[0075] Optionally, the spacing between the filter media layers of the first filter assembly 31 is 30mm-35mm, and the spacing between the filter media layers of the second filter assembly 32 is 15mm-55mm. Thus, large dust particles can be filtered out by the first filter assembly 31, and then further filtered by the second filter assembly 32. This further improves the filtration effect of the filter assembly 3 on the flue gas.

[0076] The pre-filter device 100 of the probe in this embodiment of the invention, by arranging the filter media layer 312 in the shape of juniper leaves, allows the filter media volume to increase under the action of back-blowing air pressure during reverse blowing cleaning. This automatically widens the filter gap, causing the filter media layer 312 to vibrate under the action of the back-blowing air force, thereby shaking off the particles on the filter media layer 312 and blowing them out with the back-blowing air. This has the advantage of extending the service life of the filter assembly 3.

[0077] Optionally, the filter media layer 312 is formed of a plurality of soft, angled needle-like protrusions. This can further improve the filtration effect of the filter assembly 3.

[0078] Optionally, the spacing between adjacent needle-like protrusions is 5mm-8mm.

[0079] like Figure 4 As shown, the filter assembly 3 also includes a flexible filter layer 34, which is positioned between the exhaust port of the bypass gas path and the exhaust port of the main gas path when air is introduced through the bypass gas path. Therefore, during backflushing, the volume of the flexible filter layer 34 increases, and the filtration gap automatically widens. This further enhances the filtration effect on the flue gas.

[0080] The flexible filter layer 34 is a fluorosilicone filter media layer. Therefore, it has the advantages of good corrosion resistance and long service life.

[0081] The filter assembly 3 also includes an adsorption coating, which is disposed on the surface of the flexible filter layer 34. This enhances the adsorption capacity of the flexible filter layer 34 for particles in the flue gas, thereby further improving the filtration efficiency of the flexible filter layer 34.

[0082] like Figure 4 , Figure 5 and Figure 7 As shown, the filter assembly 3 also includes a ceramic filter element 33, which is disposed between the exhaust port 112 and the monitoring and analysis device. This allows for further filtration of the smoke and dust.

[0083] According to an embodiment of the present invention, the flue gas analysis and monitoring system is characterized in that it includes a monitoring and analysis device and a pre-filter 100 as described above, wherein the exhaust port 112 of the main gas path 1 is connected to the monitoring and analysis device to monitor the components in the flue gas.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pre-filtering device for a probe, characterized in that, include: The main gas path has an air inlet and an exhaust outlet arranged opposite to each other along its axial direction. The air inlet is used to communicate with the flue, and the exhaust outlet is used to communicate with the monitoring and analysis device. A bypass gas path, which connects the air inlet and the exhaust port of the main gas path to guide the flue gas flow through the bypass gas path; and A filter assembly, wherein the filter assembly is disposed within the bypass air passage; The bypass air path includes a zigzag-shaped cylindrical body, and the filter assembly includes a fixed plate and a filter media layer. The fixed plate is disposed inside the zigzag-shaped cylindrical body, and the filter media layer is disposed inside the fixed plate. The filter media layer and the fixing plate are multiple, and the multiple filter media layers are disposed on the fixing plate. The fixing plate is staggered along the extension direction of the zigzag cylindrical body. The filter media layer is shaped like a juniper leaf and is formed by multiple soft and inclined needle-like protrusions. The angle between the needle-like protrusions and the extension direction of the zigzag cylinder is 30°-50°, and the distance between adjacent needle-like protrusions is 5mm-8mm. During reverse air cleaning, the volume of the filter media layer increases under the pressure of the reverse air, the filter gap automatically increases, and the filter media layer will shake under the action of the reverse air force, thereby causing the particles on the filter media layer to fall off and be blown out with the reverse air.

2. The pre-filter device for the probe according to claim 1, characterized in that, The main air passage includes a main cylinder and a clearing rod disposed within the main cylinder. The clearing rod is movably disposed within the main cylinder to clear any blockages in the air inlet. And / or, it also includes a backflushing device connected between the exhaust port and the smoke outlet of the bypass air passage.

3. The pre-filter device for the probe according to claim 2, characterized in that, The main cylinder is provided with a first air port and a second air port. The first air port and the second air port are located on the peripheral wall of the main cylinder at a position between the air inlet and the exhaust port. The smoke inlet of the bypass air passage is connected to the first air port, and the smoke outlet of the bypass air passage is connected to the second air port to form a bypass air passage.

4. The pre-filter device for the probe according to claim 2, characterized in that, The air inlet of the main cylinder has a constricted assembly part, which passes through the flue, and the unblocking rod is movably disposed at the unblocking rod protrusion along the axial direction of the main cylinder; And / or, it also includes an opening and closing door panel having a convertible open state and a closed state, wherein in the closed state, the flue gas from the filter device flows sequentially through the air inlet, the bypass air passage, and the exhaust port.

5. The pre-filter device for the probe according to claim 4, characterized in that, The opening and closing door panel includes a movable plate and a fixed plate. The fixed plate is connected to the inner wall of the main cylinder, and the movable plate is connected to the unblocking rod so that the opening and closing door panel can switch between the open state and the closed state as the unblocking rod moves.

6. The pre-filter device for the probe according to claim 1, characterized in that, The filter assembly includes a first filter assembly and a second filter assembly, wherein the first filter assembly is disposed near the air inlet and the second filter assembly is disposed near the exhaust outlet.

7. The pre-filter device for the probe according to claim 6, characterized in that, The filter assembly further includes a flexible filter layer disposed between the exhaust port of the bypass gas path and the exhaust port of the main gas path in order to filter particulate matter in the flue gas. And / or, the filtration assembly further includes a ceramic filter element disposed between the exhaust port and the monitoring and analysis device.

8. The pre-filter device for the probe according to claim 7, characterized in that, The flexible filter layer is a fluorosilicone filter medium layer; And / or, the filter assembly further includes an adsorption coating disposed on the surface of the flexible filter layer.

9. A flue gas analysis and monitoring system, characterized in that, It includes a monitoring and analysis device and a pre-filter device according to any one of claims 1-8, wherein the exhaust port of the main gas path is connected to the monitoring and analysis device to monitor the components in the flue gas.

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