Hearth flue gas temperature measuring device and method

Abstract

The invention relates to the technical field of flue gas temperature measurement, and discloses a hearth flue gas temperature measuring device which comprises a temperature measuring shell installed at a hearth flue gas outlet, the top of the temperature measuring shell is fixedly connected with a fixing frame, a cooling shell is fixedly connected in the fixing frame, and a flue gas inlet funnel is fixedly connected in the temperature measuring shell; the invention further provides a hearth flue gas temperature measuring method which comprises the following steps: S1, mounting: mounting the temperature measuring shell at the flue gas outlet of the hearth through the fixing flange, and enabling the flue gas of the hearth to enter the temperature measuring shell. According to the invention, the flue gas temperature at different hearth positions can be measured, the accuracy of measuring the flue gas temperature by the measuring device is improved, the flue gas can be cooled, the environment temperature is prevented from rising, impurities in external air can be prevented from entering the cooling shell through the air inlet pipe and the air outlet pipe, and the cooling effect is improved. Therefore, dust is prevented from being accumulated in the cooling shell.

Description

Technical Field

[0001] This invention relates to the field of flue gas temperature measurement technology, and in particular to a furnace flue gas temperature measurement device and method. Background Technology

[0002] Furnace temperature is an important parameter reflecting the boiler combustion process. To ensure the proper operation of a power plant boiler, the distribution of the combustion flame in the furnace must be reasonable and stable. Problems such as boiler efficiency, furnace coking, furnace tube rupture, and NOx generation are all related to the temperature inside the furnace. Therefore, accurate measurement of the temperature inside the furnace is of great significance for diagnosing the boiler's operating condition.

[0003] Existing flue gas temperature measurement devices can only measure the flue gas temperature at a fixed location in the furnace. After the flue gas temperature is measured, they cannot cool the flue gas, which leads to an increase in ambient temperature after the flue gas is emitted. In order to better address the above problems, promote the development of industry technology, and improve core competitiveness, this application proposes a new composition structure that is different from the existing technology. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a furnace flue gas temperature measuring device and method. The main purpose is to solve the problem that existing flue gas temperature measuring devices can only measure the flue gas temperature at a fixed location in the furnace, and cannot cool the flue gas after the temperature measurement is completed, which leads to an increase in ambient temperature after the flue gas is emitted.

[0005] (II) Technical Solution To achieve the above objectives, the present invention adopts the following technical solution: A furnace flue gas temperature measuring device includes a temperature measuring shell installed at the furnace flue gas outlet. A fixing frame is fixedly connected to the top of the temperature measuring shell, and a cooling shell is fixedly connected inside the fixing frame. A flue gas inlet funnel is fixedly connected inside the temperature measuring shell and is fixed to the cooling shell. A curved flue gas outlet pipe is fixedly connected inside the cooling shell, and the bottom end of the flue gas outlet pipe passes through the cooling shell and communicates with the flue gas inlet funnel. The top end of the flue gas outlet pipe passes through the temperature measuring shell. A movable temperature measuring component for measuring the flue gas temperature is provided inside the temperature measuring shell below the flue gas inlet funnel. A blowing component for cooling the flue gas is provided on the cooling shell.

[0006] Furthermore, the movable temperature measuring component includes a thermocouple sensor and two fixed plates. Both fixed plates are fixedly connected to the inner wall of the temperature measuring shell and are symmetrically distributed. Two dovetail grooves are formed on opposite sides of each of the two fixed plates. Dovetail blocks are slidably connected within the dovetail grooves. A sliding rod is fixedly connected between two opposite dovetail blocks. A mounting bracket is slidably connected to the outer sides of the two sliding rods. The thermocouple sensor is fixedly connected within the mounting bracket. A threaded hole is formed on one side of the mounting bracket, and a lead screw is threaded into the threaded hole. Alternating grooves are formed on opposite sides of both fixed plates. The two ends of the lead screw extend into the two alternating grooves respectively. Gears are keyed to both ends of the lead screw. A rack meshing with the gears is fixedly connected to one side of each of the two alternating grooves. A drive assembly for driving the mounting bracket to move up and down is provided inside the temperature measuring shell.

[0007] Based on the aforementioned scheme, the drive assembly includes a support plate, which is fixedly connected to the inner wall of one side of the temperature measuring shell at the bottom position. A threaded rod is rotatably connected to the top of the support plate via a bearing. Fixed rods are fixedly connected to the outer sides of the two sliding rods near both ends. A connecting plate is fixedly connected to the top of the multiple fixed rods. The threaded rod passes through the connecting plate and is threadedly connected to the connecting plate. A fixed seat is fixedly connected to the bottom outer wall of the cooling shell. A drive motor is fixedly connected inside the fixed seat. One end of the output shaft of the drive motor passes through the fixed seat and is connected to a connecting shaft via a coupling. One end of the connecting shaft passes through the smoke inlet funnel and is fixed to the threaded rod via a coupling.

[0008] As a further embodiment of the present invention, the upper surface of the connecting plate is provided with a plurality of uniformly distributed smoke passage holes.

[0009] Furthermore, the blower assembly includes an air inlet pipe, which is fixedly connected to one side of the cooling shell and communicates with the interior of the cooling shell. An exhaust fan is fixedly connected inside the air inlet pipe, and an air outlet pipe is fixedly connected to the other side of the cooling shell and communicates with the interior of the cooling shell.

[0010] Based on the aforementioned scheme, filters are fixedly connected inside both the air inlet pipe and the air outlet pipe.

[0011] As a further embodiment of the present invention, a fixing flange for installing the temperature measuring shell is fixedly connected to the bottom of the outer side of the temperature measuring shell.

[0012] This invention also proposes a method for measuring furnace flue gas temperature, comprising the following steps: S1: Installation: Install the temperature measuring shell at the flue gas outlet of the furnace through the fixing flange, so that the flue gas in the furnace enters the temperature measuring shell and the temperature of the flue gas is measured by the thermocouple sensor. S2: Position adjustment. The drive motor drives the threaded rod to rotate, causing the connecting plate to move the slide rod downward along the dovetail groove through the dovetail block. At the same time, the slide rod drives the mounting bracket to move downward. The mounting bracket will drive the thermocouple sensor to move vertically downward. During the movement of the mounting bracket, the meshing of the gear and rack will cause the lead screw to rotate, thereby causing the mounting bracket to move horizontally along the slide rod to change the position of the thermocouple sensor. S3: The flue gas is collected. After the temperature is measured by the temperature measuring shell, the flue gas will enter the flue gas outlet pipe inside the cooling shell through the flue gas inlet funnel and flow along the flue gas outlet pipe. S4: Cooling. The exhaust fan draws in cold air from outside and directs it into the cooling housing through the intake pipe. This allows the cold air to come into contact with the exhaust pipe, resulting in heat exchange between the cold air and the flue gas inside the exhaust pipe, thus cooling the flue gas.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a furnace flue gas temperature measuring device and method, which has the following beneficial effects: 1. By setting up a movable temperature measuring component, the present invention can change the position of the furnace flue gas temperature measurement, thereby enabling the measurement of the furnace flue gas at different positions and improving the accuracy of the measuring device in measuring flue gas temperature.

[0014] 2. By setting up a blowing component, the present invention can blow air into the flue pipe when the flue gas is discharged through the flue pipe, thereby exchanging heat between the cold air and the flue gas inside the flue pipe. At the same time, since the flue pipe is curved, the flow time of the flue gas can be increased, thereby better exchanging heat with the flue gas, cooling the flue gas and avoiding the rise of the ambient temperature.

[0015] 3. By setting up a filter screen, the present invention can prevent impurities in the outside air from entering the cooling shell through the air inlet and outlet pipes when the exhaust pipe is cooled by blowing air, thereby preventing dust from accumulating inside the cooling shell. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a furnace flue gas temperature measuring device proposed in this invention; Figure 2 This is an enlarged structural diagram of part A of the furnace flue gas temperature measuring device proposed in this invention; Figure 3 This is a schematic cross-sectional view of the temperature measuring shell of a furnace flue gas temperature measuring device proposed in this invention.

[0017] Figure 4 This is an enlarged structural schematic diagram of the movable temperature measuring component of a furnace flue gas temperature measuring device proposed in this invention; Figure 5 This is a schematic cross-sectional view of the cooling shell structure of a furnace flue gas temperature measuring device proposed in this invention; Figure 6 This is a schematic diagram of the process structure of a furnace flue gas temperature measurement method proposed in this invention.

[0018] In the diagram: 1. Temperature measuring shell; 2. Smoke inlet funnel; 3. Fixing frame; 4. Air inlet pipe; 5. Cooling shell; 6. Air outlet pipe; 7. Fixing flange; 8. Drive motor; 9. Fixing base; 10. Connecting shaft; 11. Moving temperature measuring component; 12. Support plate; 13. Threaded rod; 14. Connecting plate; 15. Smoke passage hole; 16. Fixing rod; 17. Sliding rod; 18. Dovetail block; 19. Gear; 20. Lead screw; 21. Thermocouple sensor; 22. Mounting bracket; 23. Alignment groove; 24. Rack; 25. Dovetail groove; 26. Fixing plate; 27. Filter screen; 28. Smoke outlet pipe; 29. ​​Exhaust fan; 30. Threaded hole. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-6 A furnace flue gas temperature measuring device includes a temperature measuring shell 1 installed at the furnace flue gas outlet. A fixing flange 7 for installing the temperature measuring shell 1 is welded to the bottom of the outer side of the temperature measuring shell 1. A fixing frame 3 is welded to the top of the temperature measuring shell 1. A cooling shell 5 is fixed inside the fixing frame 3 by bolts. A flue gas inlet funnel 2 is welded inside the temperature measuring shell 1 and is fixed to the cooling shell 5. A curved flue gas outlet pipe 28 is welded inside the cooling shell 5. The bottom end of the flue gas outlet pipe 28 passes through the cooling shell 5 and is connected to the flue gas inlet funnel 2. The top end of the flue gas outlet pipe 28 passes through the temperature measuring shell 1. The temperature measuring shell 1 is installed at the furnace flue gas outlet through the fixing flange 7. When the flue gas from the furnace is discharged, it enters the temperature measuring shell 1, then enters the flue gas outlet pipe 28 inside the cooling shell 5 through the flue gas inlet funnel 2, and is discharged from the flue gas outlet pipe 28. In this invention, a movable temperature measuring component 11 for measuring flue gas temperature is provided inside the temperature measuring shell 1, located below the flue gas inlet funnel 2. The movable temperature measuring component 11 includes a thermocouple sensor 21 and two fixed plates 26. Both fixed plates 26 are fixed to the inner wall of the temperature measuring shell 1 by bolts, and the two fixed plates 26 are symmetrically distributed. Two dovetail grooves 25 are opened on the opposite side of each of the two fixed plates 26. Dovetail blocks 18 are slidably connected in the multiple dovetail grooves 25. A sliding rod 17 is welded between two opposite dovetail blocks 18. A mounting bracket 22 is slidably connected to the outer side of the two sliding rods 17. The thermocouple sensor 21 is connected to the inner wall of the temperature measuring shell 1 by bolts. The thermocouple sensor 21 is a WRPS-130 model, which is fixed in the mounting bracket 22 and has an applicable temperature range of 0-1600℃. A threaded hole 30 is opened on one side of the mounting bracket 22, and a lead screw 20 is threaded into the threaded hole 30. A clearance groove 23 is opened on the opposite side of the two fixing plates 26. The two ends of the lead screw 20 extend into the two clearance grooves 23 respectively. A gear 19 is keyed to both ends of the lead screw 20. A rack 24 that meshes with the gear 19 is fixed to one side of the two clearance grooves 23 by bolts. When the flue gas enters the temperature measuring shell 1, the thermocouple sensor 21 will measure the temperature of the flue gas. Specifically, the temperature measuring housing 1 is equipped with a drive assembly for the vertical movement of the drive mounting bracket 22. The drive assembly includes a support plate 12, which is welded to the bottom of one side inner wall of the temperature measuring housing 1. A threaded rod 13 is rotatably connected to the top of the support plate 12 via a bearing. Fixing rods 16 are welded to the outer sides of the two sliding rods 17 near both ends. A connecting plate 14 is welded to the top of the multiple fixing rods 16. The threaded rod 13 passes through the connecting plate 14 and is threadedly connected to the connecting plate 14. A fixing rod is welded to the bottom outer wall of the cooling housing 5. The drive motor 8, model DSZRF27-58, is bolted to the base 9. It has a reduction function. One end of the output shaft of the drive motor 8 passes through the base 9 and is connected to a connecting shaft 10 via a coupling. The other end of the connecting shaft 10 passes through the smoke inlet funnel 2 and is fixed to the threaded rod 13 via the coupling. When the position of the thermocouple sensor 21 needs to be changed, the drive motor 8 is started. The drive motor 8 drives the connecting shaft 10 to rotate, which in turn drives the threaded rod 13 to rotate. During the process, the connection plate 14 is engaged with the threaded connection of the connecting plate 14, which in turn causes the connecting plate 14 to move the sliding rod 17 downward via the fixed rod 16. The sliding rod 17 moves vertically downward along the dovetail groove 25 via the dovetail block 18. At the same time, the sliding rod 17 causes the mounting bracket 22 to move downward, which in turn causes the thermocouple sensor 21 to move downward. During the movement of the mounting bracket 22, the lead screw 20 moves, which in turn causes the gear 19 to move. During the movement of the gear 19, the engagement with the rack 24 causes the gear 19 to rotate, which in turn causes the lead screw 20 to rotate. The lead screw 20 engages with the threaded hole 30 on the mounting bracket 22, which causes the mounting bracket 22 to move horizontally along the sliding rod 17. This allows the thermocouple sensor 21 to move horizontally while moving vertically, thereby changing the position of the thermocouple sensor 21 to measure the flue gas in the furnace at different positions, improving the accuracy of the measuring device in measuring the flue gas temperature. When the thermocouple sensor 21 needs to be reset, it can be reversed by the drive motor 8. The upper surface of the connecting plate 14 is provided with a plurality of evenly distributed smoke passage holes 15, which can prevent the connecting plate 14 from obstructing the flow of smoke. In this invention, the cooling shell 5 is equipped with a blower assembly for cooling the flue gas. The blower assembly includes an air inlet pipe 4, which is welded to one side of the cooling shell 5 and connected to the interior of the cooling shell 5. An exhaust fan 29 is fixed inside the air inlet pipe 4 by bolts. An exhaust pipe 6 is welded to the other side of the cooling shell 5 and connected to the interior of the cooling shell 5. When the flue gas is discharged through the exhaust pipe 28, the exhaust fan 29 is activated. The exhaust fan 29 draws in external cold air and brings it into the cooling shell 5 through the air inlet pipe 4, thus cooling the flue gas. The air comes into contact with the flue gas outlet pipe 28, allowing the cold air to exchange heat with the flue gas inside the outlet pipe 28, thereby cooling the flue gas. The air that has absorbed heat will be discharged from the cooling shell 5 through the exhaust pipe 6. At the same time, since the exhaust pipe 28 is curved, it increases the flue gas flow time, thereby enabling better heat exchange and cooling of the flue gas, and preventing the ambient temperature from rising. Both the intake pipe 4 and the exhaust pipe 6 are equipped with filters 27 fixed with bolts. The filters 27 can prevent dust in the outside air from entering the cooling shell 5.

[0021] Working principle: During use, the temperature measuring shell 1 is installed at the flue gas outlet of the furnace through the fixed flange 7. At this time, the flue gas in the furnace will enter the temperature measuring shell 1. The thermocouple sensor 21 in the movable temperature measuring component 11 inside the temperature measuring shell 1 will measure the temperature of the flue gas. The flue gas after temperature measurement will enter the flue gas outlet pipe 28 in the cooling shell 5 through the flue gas inlet funnel 2 and be discharged from the flue gas outlet pipe 28. At the same time, the exhaust fan 29 is started. The exhaust fan 29 will draw in the cold air from the outside and bring the cold air into the cooling shell 5 through the air inlet pipe 4, so that the cold air comes into contact with the flue gas outlet pipe 28, thereby exchanging heat between the cold air and the flue gas inside the flue gas outlet pipe 28, thereby cooling the flue gas. The air that has absorbed heat will be discharged from the cooling shell 5 through the air outlet pipe 6. At the same time, since the flue gas outlet pipe 28 is curved, it will increase the flue gas flow time, thereby better exchanging heat with the flue gas and better cooling the flue gas, avoiding the rise of the ambient temperature. When the temperature measurement position needs to be changed, the drive motor 8 is started. The drive motor 8 drives the connecting shaft 10 to rotate, which in turn drives the threaded rod 13 to rotate. During the rotation of the threaded rod 13, the threaded rod 13 engages with the connecting plate 14, causing the connecting plate 14 to move the sliding rod 17 downward via the fixed rod 16. The sliding rod 17 moves vertically downward along the dovetail groove 25 via the dovetail block 18. At the same time, the sliding rod 17 drives the mounting bracket 22 to move downward, which in turn drives the thermocouple sensor 21 to move downward. During the movement of the mounting bracket 22, the lead screw 20 moves, which in turn drives the gear 19 to move. During the movement, gear 19 rotates by meshing with rack 24, which in turn drives lead screw 20 to rotate. Lead screw 20 then meshes with threaded hole 30 on mounting bracket 22, causing mounting bracket 22 to move horizontally along slide rod 17. This allows thermocouple sensor 21 to move horizontally while remaining vertical, thus changing the position of thermocouple sensor 21 to measure flue gas at different locations in the furnace, improving the accuracy of flue gas temperature measurement. When thermocouple sensor 21 needs to be reset, it can be reversed by driving motor 8.

[0022] This invention also proposes a method for measuring furnace flue gas temperature, comprising the following steps: S1: Installation: Install the temperature measuring shell 1 at the flue gas outlet of the furnace through the fixing flange 7, so that the flue gas in the furnace enters the temperature measuring shell 1 and the temperature of the flue gas is measured by the thermocouple sensor 21. S2: Position adjustment. The drive motor 8 drives the threaded rod 13 to rotate, causing the connecting plate 14 to drive the slide rod 17 to move downward along the dovetail groove 25 through the dovetail block 18. At the same time, the slide rod 17 drives the mounting bracket 22 to move downward. The mounting bracket 22 will drive the thermocouple sensor 21 to move vertically downward. During the movement of the mounting bracket 22, the meshing of the gear 19 and the rack 24 will cause the lead screw 20 to rotate, thereby causing the mounting bracket 22 to move horizontally along the slide rod 17 to change the position of the thermocouple sensor 21. S3: The flue gas is collected. After the temperature is measured by the temperature measuring shell 1, the flue gas will enter the flue gas outlet pipe 28 in the cooling shell 5 through the flue gas inlet funnel 2 and flow along the flue gas outlet pipe 28. S4: Cooling. External cold air is drawn in by the exhaust fan 29 and enters the cooling shell 5 through the air inlet pipe 4, so that the cold air comes into contact with the flue gas outlet pipe 28, thereby exchanging heat between the cold air and the flue gas inside the flue gas outlet pipe 28 to cool the flue gas.

[0023] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Furthermore, although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A furnace flue gas temperature measuring device, comprising a temperature measuring shell (1) installed at the furnace flue gas outlet, characterized in that, A fixed frame (3) is fixedly connected to the top of the temperature measuring shell (1), and a cooling shell (5) is fixedly connected inside the fixed frame (3). A smoke inlet funnel (2) is fixedly connected inside the temperature measuring shell (1), and the smoke inlet funnel (2) is fixed to the cooling shell (5). A curved smoke outlet pipe (28) is fixedly connected inside the cooling shell (5), and the bottom end of the smoke outlet pipe (28) passes through the cooling shell (5) and communicates with the smoke inlet funnel (2). The top end of the smoke outlet pipe (28) passes through the temperature measuring shell (1). A movable temperature measuring component (11) for measuring the temperature of flue gas is provided inside the temperature measuring shell (1) below the smoke inlet funnel (2). A blowing component for cooling the flue gas is provided on the cooling shell (5).

2. The furnace flue gas temperature measuring device according to claim 1, characterized in that, The movable temperature measuring component (11) includes a thermocouple sensor (21) and two fixed plates (26). The two fixed plates (26) are fixedly connected to the inner wall of the temperature measuring shell (1), and the two fixed plates (26) are symmetrically distributed. Two dovetail grooves (25) are opened on the opposite side of each of the two fixed plates (26). Dovetail blocks (18) are slidably connected in the multiple dovetail grooves (25). A sliding rod (17) is fixedly connected between the two opposite dovetail blocks (18). A mounting bracket (22) is slidably connected to the outer side of the two sliding rods (17). The thermocouple sensor (21) is fixedly connected to the inner wall of the temperature measuring shell (1). The mounting bracket (22) is fixedly connected to the mounting bracket (22). A threaded hole (30) is provided on one side of the mounting bracket (22). A lead screw (20) is threadedly connected in the threaded hole (30). A clearance groove (23) is provided on the opposite side of the two fixed plates (26). The two ends of the lead screw (20) extend into the two clearance grooves (23) respectively. A gear (19) is keyed to both ends of the lead screw (20). A rack (24) that meshes with the gear (19) is fixedly connected to one side of the two clearance grooves (23). A drive assembly for driving the mounting bracket (22) to move up and down is provided inside the temperature measuring shell (1).

3. The furnace flue gas temperature measuring device according to claim 2, characterized in that, The drive assembly includes a support plate (12), which is fixedly connected to the inner wall of the temperature measuring shell (1) at the bottom. The top of the support plate (12) is rotatably connected to a threaded rod (13) via a bearing. The outer sides of the two slide rods (17) are fixedly connected to fixed rods (16) near both ends. The top of the multiple fixed rods (16) is fixedly connected to a connecting plate (14). The threaded rod (13) passes through the connecting plate (14) and is threadedly connected to the connecting plate (14). The bottom outer wall of the cooling shell (5) is fixedly connected to a fixed seat (9). The fixed seat (9) is fixedly connected to a drive motor (8). One end of the output shaft of the drive motor (8) passes through the fixed seat (9) and is connected to a connecting shaft (10) via a coupling. One end of the connecting shaft (10) passes through the smoke inlet funnel (2) and is fixed to the threaded rod (13) via a coupling.

4. The furnace flue gas temperature measuring device according to claim 3, characterized in that, The upper surface of the connecting plate (14) is provided with a plurality of evenly distributed smoke passage holes (15).

5. The furnace flue gas temperature measuring device according to claim 1, characterized in that, The blower assembly includes an air inlet pipe (4), which is fixedly connected to one side of the cooling shell (5) and is connected to the interior of the cooling shell (5). An exhaust fan (29) is fixedly connected inside the air inlet pipe (4), and an air outlet pipe (6) is fixedly connected to the other side of the cooling shell (5) and is connected to the interior of the cooling shell (5).

6. The furnace flue gas temperature measuring device according to claim 5, characterized in that, Both the air inlet pipe (4) and the air outlet pipe (6) are fixedly connected with filter screens (27).

7. The furnace flue gas temperature measuring device according to claim 1, characterized in that, A fixing flange (7) for installing the temperature measuring shell (1) is fixedly connected to the bottom of the outer side of the temperature measuring shell (1).

8. A method for measuring the temperature of flue gas in a furnace, characterized in that, Includes the following steps: S1: Installation: Install the temperature measuring shell (1) at the flue gas outlet of the furnace through the fixed flange (7), so that the flue gas in the furnace enters the temperature measuring shell (1) and the temperature of the flue gas is measured by the thermocouple sensor (21). S2: Position adjustment. The drive motor (8) drives the threaded rod (13) to rotate, causing the connecting plate (14) to drive the slide rod (17) to move downward along the dovetail groove (25) through the dovetail block (18). At the same time, the slide rod (17) drives the mounting bracket (22) to move downward. The mounting bracket (22) will drive the thermocouple sensor (21) to move vertically downward. During the movement of the mounting bracket (22), the meshing of the gear (19) and rack (24) will cause the lead screw (20) to rotate, thereby causing the mounting bracket (22) to move horizontally along the slide rod (17) to change the position of the thermocouple sensor (21). S3: The flue gas is collected and after being measured by the temperature measuring shell (1), the flue gas will enter the flue gas outlet pipe (28) in the cooling shell (5) through the flue gas inlet funnel (2) and flow along the flue gas outlet pipe (28); S4: Cooling: The cold air outside is drawn in by the exhaust fan (29) and enters the cooling shell (5) through the air inlet pipe (4). The cold air comes into contact with the flue pipe (28) so that the cold air and the flue gas inside the flue pipe (28) can exchange heat to cool the flue gas.

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