Detection mechanism for flue gas measurement

Abstract

The utility model relates to a detection mechanism for flue gas measurement, which comprises a flow cell, two ends of the flow cell are respectively provided with a support plate, and the two support plates are respectively provided with a laser irradiator and a photoelectric converter. Optical lenses are arranged on the two supporting plates and located between the laser irradiator and the flow cell and between the photoelectric converter and the flow cell respectively, annular first mounting parts are integrally formed at the two ends of the flow cell respectively, and a first pressing ring and a second pressing ring are arranged in the first mounting parts respectively; a lens is arranged between the first pressing ring and the second pressing ring which are located on the same side, the first pressing ring and the second pressing ring increase the distance between the two sides of the lens and the inside and the outside of the flow cell, the heat conduction efficiency of heat tracing on the lens through the first pressing ring and the second pressing ring is improved, and meanwhile the heat exchange efficiency of the lens heated in a heat tracing pipeline and outside air is reduced. Therefore, the generation of condensate water and ammonium hydrogen sulfate crystals is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas detection, and more specifically, to a detection mechanism for flue gas measurement. Background Art

[0002] During the power generation process of coal-fired power plants, a certain amount of flue gas is generated during the combustion of traditional energy sources. These flue gases often contain substances such as sulfides and ammonia, which requires power plant staff to use professional detection equipment to conduct irregular detections on the concentration of flue gas. Considering the easy adsorption of ammonia, for such flue gases, power plant staff often avoid using the detection method of leading the gas to the detection equipment through a metal pipe, and instead choose the detection method of laser spectroscopy for close-range detection of flue gas.

[0003] The existing laser spectroscopy method extracts a part of the flue gas into a flow cell as the sample gas, then irradiates the extracted sample gas with a laser, and finally receives the irradiated laser through a photoelectric converter and converts it into an electrical signal. The concentration information of the measured sample gas is obtained through the analysis of the electrical signal.

[0004] In the above process, in order to ensure that the laser can transmit to the position where the photoelectric converter is located, an optical lens and a lens are respectively added at both ends of the flow cell. Among them, the lens needs to be arranged at both ends inside the flow cell. However, due to the high water content in the flue gas, and the distances between both sides of the lens and the outside air of the flow cell and the sampled gas inside the flow cell are relatively close. Over time, a large amount of condensed water and pasty ammonium bisulfate crystals will be generated on the surface of the lens, resulting in a decrease in the light transmittance of the lens, and then the electrical signal of the photoelectric converter gradually decreases. When the staff analyzes the decreased electrical signal, they need to perform a product calculation based on the electrical signal value converted by the photoelectric converter when there is no ammonium bisulfate crystal and condensed water on the lens, which directly leads to a large error between the calculated data and the actual data. At the same time, the pasty ammonium bisulfate crystals are also likely to cause blockage of the flow cell, thus having a great impact on the long-term stability and reliability of the measurement process.

[0005] Therefore, a detection mechanism that can effectively reduce the generation of condensed water and ammonium bisulfate crystals on the lens surface is needed to avoid the problem of decreased light transmittance of the lens caused by the rapid generation of ammonium bisulfate crystals on the lens surface, and at the same time reduce the cleaning frequency of the lens surface by the staff, so as to improve the detection efficiency of the sampled gas and the accuracy of the detected value and the actual value. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a detection mechanism for flue gas measurement to solve the problems existing in the background art.

[0007] To achieve the above object, the present utility model provides a detection mechanism for flue gas measurement, which includes a photoelectric converter, a flow cell, and a laser irradiator arranged in sequence from left to right. An optical lens is respectively arranged between the photoelectric converter and the flow cell, and between the flow cell and the laser irradiator; the two ends of the flow cell are respectively open towards the photoelectric converter and the laser irradiator.

[0008] Further, a circular first mounting portion is integrally formed at each end of the flow cell, and both first mounting portions are communicated with the flow cell; a support plate in an L shape is respectively arranged at both ends of the flow cell, and the short arms of the two support plates are fixedly connected to the first mounting portion on the same side. Mounting grooves coaxial with the first mounting portion on the same side are respectively opened on the short arms of the two support plates;

[0009] The photoelectric converter and the optical lens on the same side, and the laser irradiator and the optical lens on the same side are respectively mounted on the long arms of the two support plates.

[0010] Further, a circular second mounting portion is respectively arranged in the two first mounting portions, and a first pressing ring and a second pressing ring are respectively arranged in each second mounting portion. A lens is arranged between the first pressing ring and the second pressing ring on the same side.

[0011] Further, the two second pressing rings are respectively arranged on the side of the second mounting portion away from the flow cell, and the two first pressing rings are respectively arranged on the side of the second mounting portion close to the flow cell;

[0012] A pressing ring is respectively arranged in each second mounting portion and on the side of the second pressing ring away from the flow cell. Threads adapted to each other are respectively opened on the surfaces of the two pressing rings and the inner circumferential surface of the corresponding second mounting portion, and the pressing ring is threadedly connected to the second mounting portion.

[0013] Further, a first sealing ring is respectively arranged on both sides of each lens;

[0014] The two first sealing rings are in contact with the surface of the lens, and the first pressing ring and the second pressing ring are respectively in contact with the first sealing rings on both sides of the lens.

[0015] Further, the opposite surfaces of the first pressing ring and the second pressing ring on the same side are inclined surfaces adapted to each other, and the lens is inclined and installed at the position between the first pressing ring and the second pressing ring on the same side.

[0016] Further, through grooves located on the same horizontal plane are respectively opened on the first pressing ring and the second pressing ring, and each mounting groove and each through groove are arranged on the same central axis;

[0017] The light outlet of the laser irradiator and the receiving end of the photoelectric converter are flush with the central axis of the through groove.

[0018] Further, the detection mechanism further includes a first housing and a second housing. On the opposite side surfaces of the first housing and the second housing, first grooves adapted to the flow cell and the first mounting portion are concavely provided;

[0019] On the opposite sides of the first housing and the second housing, a second groove is provided inside each. A heat tracing pipeline is provided in each second groove; A baffle is detachably installed at the opening of each second groove.

[0020] Further, an annular limiting plate is additionally provided on the inner surface of the inner ring of each second mounting portion near the flow cell; An annular placement groove is provided on the outer surface of each first pressing ring near the flow cell. A second sealing ring is provided in each limiting plate and each placement groove;

[0021] A protrusion is integrally formed at one end of each second mounting portion away from the flow cell. A groove adapted to the protrusion is provided at a position corresponding to the protrusion on the inner ring of each first mounting portion.

[0022] Compared with the prior art, the remarkable advantages of the present utility model are:

[0023] 1. Through the second pressing ring, the outside of the lens is covered with material except for the part where the laser passes through, increasing the distance between the lens and the outside space, thereby effectively reducing the heat exchange efficiency between the lens and the outside air after the heat tracing pipeline is heated, so as to ensure that the lens reaches the temperature to avoid crystallization on its surface, thereby effectively avoiding the generation of condensed water; Through the first pressing ring, the sampled gas drawn into the flow cell forms a relatively non-flowing state in front of the lens, greatly reducing the replacement speed of the sampled gas on the inner surface of the lens, and thus effectively reducing the replacement of crystallizable substances; At the same time, in this state, even if the temperature of the lens fails to reach the required temperature to avoid crystallization, there will not be enough raw materials in front of the lens to quickly generate crystals, further reducing the generation of crystals, and thus improving the working efficiency of the detection mechanism.

[0024] 2. By using the support plate to limit the second mounting portion, the disassembly and assembly efficiency of the detection mechanism is improved, and thus the maintenance efficiency of each component of the detection mechanism is effectively improved; The detachable baffle enables the staff to quickly maintain and replace the heat tracing pipeline, thereby improving the working efficiency of the detection mechanism. Description of the Drawings

[0025] Figure 1 is the main view of the present utility model;

[0026] Figure 2 is a cross-sectional view of the present utility model near the end of the photoelectric converter;

[0027] Figure 3 is a plan cross-sectional view of the present utility model near the end of the laser irradiator.

[0028] In the figure: 1. Flow cell; 11. First mounting part; 111. Groove; 12. First pressing ring; 121. Placing groove; 13. Second pressing ring; 14. Lens; 15. First sealing ring; 2. Support plate; 21. Laser irradiator; 22. Photoelectric converter; 23. Optical lens; 3. Second mounting part; 31. Limiting plate; 32. Protrusion; 4. Through groove; 5. First housing; 6. Second housing; 7. Pressing ring; 8. Baffle; 9. Second sealing ring. Specific embodiments

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model fall within the scope of protection of the present utility model.

[0030] As Figures 1-3 shown, the present utility model provides a detection mechanism for flue gas measurement, including a photoelectric converter 22, a flow cell 1, and a laser irradiator 21 arranged in sequence from left to right. An optical lens 23 is respectively arranged between the photoelectric converter 22 and the flow cell 1, and between the flow cell 1 and the laser irradiator 21; the two open ends of the flow cell 1 face the photoelectric converter 22 and the laser irradiator 21 respectively.

[0031] In one embodiment, a ring-shaped first mounting part 11 is integrally formed at each end of the flow cell 1, and both first mounting parts 11 communicate with the flow cell 1; a support plate 2 in an L shape is provided at each end of the flow cell 1, and the short arms of the two support plates 2 are fixedly connected to the first mounting part 11 on the same side. The photoelectric converter 22 and the optical lens 23 on the same side, and the laser irradiator 21 and the optical lens 23 on the same side are respectively mounted on the long arms of the two support plates 2.

[0032] In one embodiment, a ring-shaped first mounting part 11 is integrally formed at each end of the flow cell 1, and both first mounting parts 11 communicate with the flow cell 1. A ring-shaped second mounting part 3 is respectively arranged in the two first mounting parts 11.

[0033] In one embodiment, a first pressing ring 12 and a second pressing ring 13 are respectively arranged in each second mounting part 3, and a lens 14 is arranged between the first pressing ring 12 and the second pressing ring 13 on the same side.

[0034] In one embodiment, the surfaces of the first pressing ring 12 and the second pressing ring 13 on the same side that face each other are both bevel surfaces that are adapted to each other, and the lens 14 is inclined and installed at the position between the first pressing ring 12 and the second pressing ring 13 on the same side.

[0035] During use, first connect the air inlet and the air outlet on the flow cell 1, so as to facilitate the smooth entry of the sample gas into the flow cell 1. Subsequently, turn on the laser irradiator 21 and the photoelectric converter 22. The optical signal emitted by the laser irradiator 21 sequentially passes through the optical lens 23 on the support plate 2 where the laser irradiator 21 is located, the lens 14 on the side close to the laser irradiator 21, the flow cell 1, the lens 14 on the side close to the photoelectric converter 22, and the optical lens 23. Finally, the photoelectric converter 22 receives the optical signal and converts it into an electrical signal, and finally analyzes the concentration information of the measured sample gas through the electrical signal.

[0036] Considering that the sample gas contains sulfides, ammonia, etc., and at the same time the water content in the sample gas is relatively high. During the detection of the sample gas, over time, it is very easy to form ammonium bisulfate crystals and condensed water on the surface of the lens 14, which affects the detection efficiency. Therefore, in this application, the first pressing ring 12 and the second pressing ring 13 are added. At the same time, through grooves 4 are provided on both the first pressing ring 12 and the second pressing ring 13 on the same horizontal plane. Installation grooves coaxial with the first installation part 11 on the same side are provided on the short arms of the two support plates 2. Each installation groove and each through groove 4 are arranged on the same central axis; the light outlet of the laser irradiator 21 and the receiving end of the photoelectric converter 22 are both flush with the central axis of the through groove 4, and the laser can irradiate into the flow cell 1 through the through groove 4 without being blocked. The first pressing ring 12 can reduce the contact area between the sample gas and the surface of the lens 14, and the through groove 4 on the first pressing ring 12 can increase the distance between the inner side of the lens 14 and the internal space of the flow cell 1. While not affecting the transmission of the optical signal, it also increases the temperature retention on the surface of the lens 14, and at the same time reduces the contact area between the sample gas and the inner side of the lens 14, so that the sample gas in contact with the lens 14 on the side of the flow cell 1 forms a relatively non-flowing state in front of the lens 14, thereby effectively reducing the replacement of crystallizable substances.

[0037] The through groove 4 on the second pressing ring 13 and the second pressing ring 13 can increase the distance between the outer side of the lens 14 and the external space, as well as the contact area with the external air. While not affecting the transmission of the optical signal, it cooperates with the first pressing ring 12 to effectively reduce the formation of cold energy water on the surface of the lens 14.

[0038] It should be noted that the above solutions for detecting the sample gas by the laser irradiator 21, the photoelectric converter 22, and the optical lens 23 are all well-known technical solutions in the art, so the working principle and the specific internal structure thereof will not be elaborated in detail in this article.

[0039] In one embodiment, after the second mounting portion 3 is mounted within the first mounting portion 11, the outer circumferential surface of the second mounting portion 3 is in contact with the inner circumferential surface of the first mounting portion 11. Both the first pressing ring 12 and the second pressing ring 13 are cylindrical and adapted to the inner circumference of the second mounting portion 3. After the first pressing ring 12 and the second pressing ring 13 are mounted within the second mounting portion 3, the side walls of the first pressing ring 12 and the second pressing ring 13 are in contact with the inner circumferential surface of the second mounting portion 3.

[0040] In one embodiment, the inner diameter of the inner circumference of the first mounting portion 11 is greater than the inner diameter of the flow cell 1; the inner diameter of the inner circumference of the second mounting portion 3 is greater than the inner diameter of the flow cell 1.

[0041] In one embodiment, on one side of each inner circumferential surface of the second mounting portion 3 close to the flow cell 1, an annular limiting plate 31 is additionally provided. The cross-section of the limiting plate 31 is L-shaped, and the surface of the long arm of the limiting plate 31 is flush with the inner circumference of the flow cell 1.

[0042] In one embodiment, a pressing ring 7 is provided on each side of the second mounting portion 3 and on the side of the second pressing ring 13 away from the flow cell 1. Threads adapted to each other are respectively provided on the surfaces of the two pressing rings 7 and the inner circumferential surface of the corresponding second mounting portion 3, and the pressing ring 7 is threadedly connected to the second mounting portion 3.

[0043] After the first pressing ring 12, the lens 14, and the second pressing ring 13 are mounted within the second mounting portion 3 in this way, by screwing in the pressing ring 7, the components within the second mounting portion 3 are fixed and limited, thereby preventing the components within the second mounting portion 3 from falling off.

[0044] In one embodiment, a first sealing ring 15 is provided on each side of each lens 14; the two first sealing rings 15 are in contact with the surface of the lens 14, and the first pressing ring 12 and the second pressing ring 13 are respectively in contact with the first sealing rings 15 located on both sides of the lens 14.

[0045] During the process of screwing in the extrusion ring, under the action of the limiting plate 31, the first pressing ring 12, the second pressing ring 13, and the first sealing rings on both sides of the lens 14 are in contact with and pressed against each other within a certain space in the second mounting portion 3, thereby achieving the limiting effect on the components within the second mounting portion 3. At the same time, the sealing performance of the detection mechanism during use is improved, effectively preventing the sample gas from overflowing, and thus improving the measurement efficiency of the sample gas.

[0046] In one embodiment, an annular placement groove 121 is provided on the outer surface of each first pressing ring 12 close to the flow cell 1, and a second sealing ring 9 is provided within each limiting plate 31 and each placement groove 121.

[0047] In one embodiment, both of the two support plates 2 are L-shaped, and the short arms of the two support plates 2 are fixedly connected to the first mounting portions 11 on the same side respectively.

[0048] Through the mutual cooperation between the short arms of the support plate 2 and the first mounting portion 11, the second mounting portion 3 is fixed and limited; at the same time, the second sealing ring 9 can further seal the sample gas in the flow cell 1 to prevent it from overflowing.

[0049] In one embodiment, the support plate 2 and the first mounting portion 11 are fixedly connected by a detachable mounting method, such as by fixing methods such as bolts or screws.

[0050] Through the detachable support plate 2 and the pressing ring 7 described above, the second mounting portion 3 and the various parts inside the second mounting portion 3 can be quickly disassembled and assembled, which effectively improves the maintenance efficiency of the staff for the detection mechanism and the replacement efficiency of damaged parts.

[0051] In one embodiment, a protrusion 32 is integrally formed at one end of each second mounting portion 3 away from the flow cell 1. The protrusion 32 can be arranged in a ring around the outer circle of the second mounting portion 3. A groove 111 adapted to the protrusion 32 is provided at a position corresponding to the inner circle of the first mounting portion 11. The cooperation between the protrusion 32 and the groove 111 plays an installation positioning effect when the second mounting portion 3 enters the inner circle of the first mounting portion 11.

[0052] As an optional implementation manner in the present utility model, the protrusion 32 can be a cuboid protrusion 32 with an arc surface at the top, and a plurality of such protrusions 32 are installed on the outer surface of the mounting portion, which can further improve the pre-installation work of the second mounting portion 3 and further improve the limiting effect on the second mounting portion 3.

[0053] As an optional implementation manner in the present utility model, the diameter of the installation groove provided on the short arm of the support rod is smaller than the diameter of the outer circle of the second mounting portion 3, so as to limit the second mounting portion 3 and the various components inside it after installation.

[0054] As an optional implementation manner in the present utility model, the diameter of the installation groove provided on the short arm of the support rod is adapted to the outermost surface of the protrusion 32 on the second mounting portion 3. At the same time, a plurality of threaded holes are horizontally provided in both the protrusion 32 and the groove 111, and the protrusion 32 and the groove 111 are fixedly installed through the threaded holes. This method makes it unnecessary to remove the support plate 2 during the disassembly process of the second mounting portion 3, improving the replacement efficiency of the second mounting portion 3 and the parts inside it.

[0055] In one embodiment, annular placement grooves 121 are formed on the surfaces where the protrusions 32 and the grooves 111 are in contact with each other, and a third sealing ring adapted thereto is provided in each anti-placement groove 121.

[0056] In one embodiment, the first sealing ring 15, the second sealing ring 9, and the third sealing ring are all made of polytetrafluoroethylene material; the first pressing ring 12 and the second pressing ring 13 are both made of polyether ether ketone material.

[0057] In one embodiment, the detection mechanism further includes a first housing 5 and a second housing 6. First grooves 111 adapted to the flow cell 1 and the first mounting portion 11 are recessed on the opposite surfaces of the first housing 5 and the second housing 6.

[0058] In one embodiment, a second groove 111 is formed inside each of the opposite sides of the first housing 5 and the second housing 6, and a heat tracing pipeline is provided in each second groove 111; a baffle 8 is detachably installed at the opening of each second groove 111.

[0059] Considering that the sample gas contains relatively high moisture, as well as sulfides, ammonia, etc., during the entire detection process, with the decrease in temperature, condensed water and ammonium bisulfate crystals will be generated in the flow cell, and at this time, it is extremely easy to cause blockage of the flow cell 1. In the long run, not only will the detection efficiency be affected, but also some parts will be damaged. By adding a heat tracing pipeline inside the first housing 5 and the second housing 6 and wrapping the flow cell 1 with the first housing 5 and the second housing 6, the temperature inside the detection mechanism is effectively increased, so that the temperatures of the flow cell 1 and the lens 14 reach the temperature to avoid crystallization (greater than 120 degrees), and at the same time, the generation of condensed water is also avoided.

[0060] In one embodiment, the baffle 8 is provided with a first opening and a second opening, and both ends of the heat tracing pipeline pass through the first opening and the second opening respectively and are connected to components such as a heat tracing controller. It should be noted that the heat tracing pipeline and the corresponding used components are technical solutions well-known to those skilled in the art, so the specific structure and working principle thereof will not be elaborated in detail herein.

[0061] In one embodiment, a plurality of first mounting holes are formed on the first housing 5, and second mounting holes corresponding to each first mounting hole are formed on the second housing 6. The first mounting hole and the second mounting hole can be fixedly connected by screws.

[0062] As an optional implementation manner in the present utility model, through holes adapted to the air inlet and the air outlet of the flow cell 1 are formed on the first housing 5 or the second housing 6 to ensure the normal use of the detection mechanism.

[0063] As an optional implementation mode in the present utility model, both the air inlet and the air outlet are annular structures protruding outwards.

[0064] In one embodiment, fixing grooves adapted to the air inlet and the air outlet are respectively recessed in the side walls where the first housing 5 and the second housing 6 are in contact. When the first housing 5 and the second housing 6 are installed, the cooperation between the fixing grooves and the air inlet and the air outlet can also play a pre-positioning effect on the first housing 5 and the second housing 6.

[0065] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A detection mechanism for flue gas measurement, characterized in that: The invention comprises a photoelectric converter (22), a circulation pool (1) and a laser irradiator (21) which are arranged in sequence from left to right. An optical lens (23) is arranged between the photoelectric converter (22) and the circulation pool (1), and between the circulation pool (1) and the laser irradiator (21). The openings at both ends of the circulation pool (1) face the photoelectric converter (22) and the laser irradiator (21), respectively.

2. A detection mechanism for flue gas measurement according to claim 1, characterized in that: An annular first mounting portion (11) is integrally formed at each of the two ends of the circulation pool (1), and the two first mounting portions (11) are both connected to the circulation pool (1); an L-shaped support plate (2) is provided at each of the two ends of the circulation pool (1), and the short arms of the two support plates (2) are respectively fixedly connected to the first mounting portion (11) on the same side, and the short arms of the two support plates (2) are each provided with a mounting groove coaxial with the first mounting portion (11) on the same side; The photoelectric converter (22) and the optical lens (23) on the same side, and the laser irradiator (21) and the optical lens (23) on the same side are respectively mounted on the long arms of the two support plates (2).

3. A detection mechanism for flue gas measurement according to claim 2, characterized in that: An annular second mounting portion (3) is respectively provided in each of the two first mounting portions (11), a first pressing ring (12) and a second pressing ring (13) are respectively provided in each of the second mounting portions (3), and a lens (14) is provided between the first pressing ring (12) and the second pressing ring (13) located on the same side.

4. A detection mechanism for flue gas measurement according to claim 3, characterized in that: The two second pressure rings (13) are respectively arranged on a side of the second mounting portion (3) away from the circulation pool (1), and the two first pressure rings (12) are respectively arranged on a side of the second mounting portion (3) close to the circulation pool (1); A clamping ring (7) is provided in each of the second mounting parts (3) and on the side of the second pressure ring (13) away from the circulation pool (1). The surfaces of the two clamping rings (7) and the inner ring surfaces of the corresponding second mounting parts (3) are respectively provided with matching threads, and the clamping ring (7) and the second mounting part (3) are threadedly connected.

5. A detection mechanism for flue gas measurement according to claim 4, characterized in that: A first sealing ring (15) is respectively provided on both sides of each lens (14); The two first sealing rings (15) are in contact with the surface of the lens (14), and the first pressure ring (12) and the second pressure ring (13) are in contact with the first sealing rings (15) located on both sides of the lens (14) respectively.

6. A detection mechanism for flue gas measurement according to claim 5, characterized in that: The surfaces opposite to the first pressing ring (12) and the second pressing ring (13) on the same side are both matching inclined surfaces, and the lens (14) is installed obliquely at a position between the first pressing ring (12) and the second pressing ring (13) on the same side.

7. A detection mechanism for flue gas measurement according to claim 2, characterized in that: The first pressure ring (12) and the second pressure ring (13) are both provided with through grooves (4) located on the same horizontal plane, and each of the mounting grooves and each of the through grooves (4) are arranged coaxially; The light outlet of the laser irradiator (21) and the receiving end of the photoelectric converter (22) are both flush with the central axis of the through slot (4).

8. A detection mechanism for flue gas measurement according to claim 2, characterized in that: The detection mechanism further comprises a first shell (5) and a second shell (6), wherein the surfaces of the first shell (5) and the second shell (6) on opposite sides are both concave with a first groove (111) adapted to the circulation pool (1) and the first mounting portion (11); A second groove (111) is provided in each of the first shell (5) and the second shell (6) on the opposite sides thereof, and a heat tracing pipeline is provided in each of the second grooves (111); a baffle (8) is detachably mounted at the opening of each of the second grooves (111).

9. A detection mechanism for flue gas measurement according to claim 5, characterized in that: An annular limiting plate (31) is additionally provided on the inner surface of each second mounting portion (3) close to the circulation pool (1); an annular placement groove (121) is provided on the outer surface of each first pressure ring (12) close to the circulation pool (1), and a second sealing ring (9) is provided in each limiting plate (31) and each placement groove (121); A protrusion (32) is integrally formed on one end of each second mounting portion (3) away from the circulation pool (1), and a groove (111) matching the protrusion (32) is provided at a position corresponding to the protrusion (32) on the inner circle of each first mounting portion (11).

Images