A device for measuring temperature and humidity of condensing flue gas with heat tracing

Abstract

A heat-traced condensate flue gas temperature and humidity measuring device relates to the field of flue gas temperature and humidity measurement technology. This invention solves the problems of inaccurate measurements in existing flue gas temperature measuring devices due to the influence of supercooled droplets, especially when using direct contact temperature measurement. Furthermore, the high flow velocity of the flue gas passing through the temperature and humidity sensors leads to measurement deviations. This invention employs a double-layered tube reverse extraction sampling method to separate the wet flue gas from the condensate droplets. The temperature of the wet flue gas is accurately measured at the in-situ flue gas inlet of the sampling inner tube. A rapid heating unit heats the extracted wet flue gas to a higher temperature, preventing secondary condensation of water vapor in the flue gas. Because the rapid heating unit heats the flue gas with constant humidity, the moisture content of the flue gas remains constant throughout the heating process. The temperature and humidity of the heated flue gas are then measured using temperature and humidity sensors. This invention improves the accuracy of flue gas temperature and humidity measurement.

Description

Technical Field

[0001] This invention relates to the field of flue gas temperature and humidity measurement technology, and specifically to a heat-traced condensate flue gas temperature and humidity measurement device. Background Technology

[0002] Due to the supercooling of the droplets, a non-uniform temperature and humidity field will be formed in the gas-liquid two-phase flow field carrying condensed droplets within the flue. According to the principle of heat balance, the existence of a supercooled temperature point on the same cross-section corresponds to the existence of an unsaturated humidity point and a non-condensing flue gas temperature point.

[0003] Currently, existing flue gas temperature measurement devices use a direct contact temperature measurement method, where the flue gas temperature sensor directly contacts the flue gas being measured. However, the condensate droplets generated after flue gas condensation and heat exchange exhibit supercooling (i.e., the droplets are cooler than the flue gas temperature), typically 3–5°C, and sometimes as high as 8–10°C. This supercooled droplet effect leads to inaccurate measurements when using the direct contact temperature measurement method to measure flue gas containing supercooled droplets.

[0004] In addition, the sampling inner tube of the existing flue gas temperature measurement device has the same diameter as the gas chamber orifice, which results in a high flow velocity of flue gas when it flows through the temperature and humidity sensor installed on the gas chamber. Since the dynamic temperature cannot be completely stopped at the sensor measuring point, the effective temperature is measured instead of the total temperature, which leads to the measurement deviation of the temperature and humidity sensor. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of inaccurate measurement of flue gas containing supercooled droplets in existing flue gas temperature measurement devices due to the influence of supercooled droplets, and the problem of measurement deviation of temperature and humidity sensors due to the high flow velocity of flue gas passing through temperature and humidity sensors. Therefore, this invention provides a heat-traced condensate flue gas temperature and humidity measurement device.

[0006] The technical solution of this invention is:

[0007] A heat-traced condensate flue gas temperature and humidity measuring device includes a double-layered tube reverse sampling unit 1, a heat-insulating flow guiding unit 2, a rapid heat tracing unit 3, a temperature and humidity sensor measuring unit 4, and a refrigeration and dehumidification unit 5. The double-layered tube reverse sampling unit 1, heat-insulating flow guiding unit 2, rapid heat tracing unit 3, and refrigeration and dehumidification unit 5 are connected sequentially from front to back. The temperature and humidity sensor measuring unit 4 is installed at the end of the rapid heat tracing unit 3 closest to the refrigeration and dehumidification unit 5. The heat-insulating flow guiding unit 2 has a cylindrical structure and a through flue gas flow guiding channel I. The double-layered reverse sampling unit 1 includes a double-layered sampling inlet 11, an outer sampling tube 12, an inner sampling tube 13, a front end fixing plate 19, a rear end fixing plate 10, and a smoke temperature sensor 15. The front end fixing plate 19 and the rear end fixing plate 10 are respectively installed at the front and rear ends of the outer sampling tube 12. The inner sampling tube 13 is inserted into the inner hole of the outer sampling tube 12. The front and rear ends of the inner sampling tube 13 are respectively fixedly connected to the front end fixing plate 19 and the rear end fixing plate 10 of the sleeve. The smoke temperature sensor 15 is inserted into the inner hole at the front end of the inner sampling tube 13. The rear end of the inner sampling tube 13 is inserted into the smoke flow channel I of the heat insulation guiding unit 2. At the front end of sampling outer tube 12 and sampling inner tube 13, near the smoke temperature sensor 15, a double-layered tube sampling inlet 11 is installed. The rapid heat tracing unit 3 includes a heat tracing pipe 31, an inner tube flue gas outlet pipe 32, and an outer tube flue gas outlet pipe 33. The inner tube flue gas outlet pipe 32 and the outer tube flue gas outlet pipe 33 are inserted in parallel in the inner hole of the heat tracing pipe 31. The front end of the inner tube flue gas outlet pipe 32 is inserted into the rear end of the flue gas guiding channel I21 of the heat insulation guiding unit 2 and is connected to the inner hole of the sampling inner tube 13. The inner tube flue gas outlet pipe 32 is connected to the air inlet of the refrigeration and dehumidification unit 5. A temperature and humidity sensor measurement unit 4 is installed on the inner tube flue gas outlet pipe 32. An outer tube flue gas exhaust port 328 is installed on the temperature and humidity sensor measurement unit 4. The front end of the outer tube flue gas outlet pipe 33 is inserted into the rear end of the flue gas guide channel II22 of the heat insulation guide unit 2 and is connected to the annular gap between the sampling outer tube 12 and the sampling inner tube 13. The rear end of the outer tube flue gas outlet pipe 33 is connected to the outer tube flue gas exhaust port 328.

[0008] Furthermore, the double-walled sampling inlet 11 includes an inner inlet tube 111 and an outer inlet tube 112. The inner inlet tube 111 is coaxially inserted into the inner hole of the outer inlet tube 112. The front sidewalls of the outer sampling tube 12 and the inner sampling tube 13 are respectively provided with coaxially arranged external and internal sampling inlet insertion holes. The outer inlet tube 112 is coaxially inserted into the external sampling inlet insertion hole. The outer inlet tube 112 is sealed to the outer sampling tube 12. The outer side of the outer inlet tube 112 is machined with an external thread that matches the external sampling nozzle. The inner inlet tube 111 coaxially passes through the wall of the outer sampling tube 12 and is inserted into the internal sampling inlet insertion hole of the inner sampling tube 13. The inner inlet tube 111 is sealed to the inner sampling tube 13.

[0009] Furthermore, the annular gap between the inner inlet tube 111 and the outer inlet tube 112 is connected to the annular gap between the outer sampling tube 12 and the inner sampling tube 13. The inner hole of the inner inlet tube 111 of the double-layer tube sampling inlet 11 is connected to the inner hole of the inner sampling tube 13. The inner wall of the inner inlet tube 111 is uniformly provided with multiple air inlets 113 of the same diameter along the circumferential direction, and the centers of the multiple air inlets 113 are located on the same plane.

[0010] Furthermore, an external sampling nozzle is coaxially inserted into the upper part of the annular gap between the inner inlet tube 111 and the outer inlet tube 112. The annular gap between the insert tube 114 and the inner inlet tube 111 is equal to the annular gap between the insert tube 114 and the outer inlet tube 112. Multiple air inlets 113 are located in the middle of the insert tube 114. The lower surface of the short plate at the top of the insert tube 114 is in contact with the upper surface of the sampling inner tube 13.

[0011] Furthermore, the double-layered tube reverse sampling unit 1 also includes a smoke temperature sensor sleeve 16, a smoke temperature sensor protective cover 17, a sampling unit fixing plate 18, and an S-shaped Pitot tube 14. The probe of the smoke temperature sensor 15 is inserted into the inner hole of the sampling inner tube 13 from the front end. The temperature measuring point of the probe of the smoke temperature sensor 15 is set at the connection between the double-layered tube sampling inlet 11 and the sampling inner tube 13. The tail end of the smoke temperature sensor 15 is mounted on the front fixing plate 19 of the sleeve through the smoke temperature sensor sleeve 16. The smoke temperature sensor sleeve 16 is covered with a smoke temperature sensor protective cover 17. The smoke temperature sensor protective cover 17 is detachably connected to the front fixing plate 19 of the sleeve. The sampling unit fixing plate 18 is coaxially fitted on the rear wall of the sampling outer tube 12. The sampling unit fixing plate 18 is detachably connected to the front end of the heat insulation and flow guiding unit 2 by fastening screws. The S-shaped Pitot tube 14 is arranged outside the sampling outer tube 12 along the length direction of the sampling outer tube 12. The front and rear ends of the S-shaped Pitot tube 14 are fixedly connected to the outer wall of the sampling outer tube 12 by two tube supports.

[0012] Furthermore, the inner flue gas outlet pipe 32 includes a front section 321, a rear section 322, a front expansion structure 323, a gas chamber 324, and a rear expansion structure 325. The gas chamber 324 is a circular tubular structure. Both the front expansion structure 323 and the rear expansion structure 325 are hollow frustum-shaped structures with openings at both ends. The front expansion structure 323 and the rear expansion structure 325 are respectively arranged opposite to each other on the front and rear sides of the gas chamber 324. The front expansion structure 323 has a large straight diameter. The large diameter end of the front expansion structure 323 is connected to the front end of the gas chamber 324, the small diameter end of the front expansion structure 323 is connected to the rear end of the front section 321 of the outlet pipe, the rear end of the front section 321 of the outlet pipe is inserted into the flue gas guiding channel I21 of the heat insulation guiding unit 2, the large diameter end of the rear expansion structure 325 is connected to the rear end of the gas chamber 324, the small diameter end of the rear expansion structure 325 is connected to the front end of the rear section 322 of the outlet pipe, and the rear end of the rear section 322 of the outlet pipe is connected to the flue gas inlet of the refrigeration and dehumidification unit 5.

[0013] Furthermore, the inner flue gas outlet pipe 32 also includes a temperature equalization baffle I 326 and a temperature equalization baffle II 327. The temperature equalization baffle I 326 and the temperature equalization baffle II 327 are installed sequentially from front to back at the air inlet of the air chamber 324. Multiple small holes are evenly distributed on the temperature equalization baffle I 326 and the temperature equalization baffle II 327.

[0014] Furthermore, the temperature and humidity sensor measurement unit 4 includes a capacitive temperature and humidity sensor 41, a temperature and humidity sensor sleeve 42, a gas sensor 43, and a gas sensor sleeve 44. Sensor socket I and sensor socket II are respectively opened on the upper and lower side walls of the gas chamber 324. The probes of the capacitive temperature and humidity sensor 41 and the gas sensor 43 pass through the sensor socket I and the sensor socket II respectively and are inserted into the gas chamber 324. The tail parts of the capacitive temperature and humidity sensor 41 and the gas sensor 43 are respectively inserted into the inner holes of the temperature and humidity sensor sleeve 42 and the gas sensor sleeve 44. The temperature and humidity sensor sleeve 42 and the gas sensor sleeve 44 are respectively sealed and installed in the sensor socket I and the sensor socket II.

[0015] Furthermore, the temperature and humidity sensor measurement unit 4 also includes a sensor mounting housing 45. Sensor mounting clearance holes I and II are respectively provided on the upper and lower side walls of the heat tracing pipe 31. Sensor mounting clearance holes I and II correspond one-to-one with sensor socket I and sensor socket II, respectively. The sensor mounting housing 45 is fitted onto the sensor mounting clearance holes I and II of the heat tracing pipe 31, and the sensor mounting housing 45 is sealed to the outer wall of the heat tracing pipe 31.

[0016] Furthermore, the refrigeration and dehumidification unit 5 includes a semiconductor cooling chip 51, a spiral cooling tube 52, a condensate collector 53, a dry flue gas outlet 54, a T-shaped connecting rod 55, a refrigeration and dehumidification backflow block 56, a lead-out pipe fixing plate 57, and a heat tracing pipeline connection 58. The refrigeration and dehumidification backflow block 56 has a circular cylindrical structure and is vertically arranged behind the heat tracing pipeline 31. One side of the outer wall of the refrigeration and dehumidification backflow block 56 is provided with an integrally formed annular flange. The rear end of the heat tracing pipeline 31 is inserted into the inner hole of the annular flange. One side of the outer wall of the refrigeration and dehumidification backflow block 56 is provided with a lead-out pipe fixing hole. The rear end of the lead-out pipe 322 is inserted into the inner hole of the lead-out pipe fixing plate 57. The lead-out pipe fixing plate 57 is inserted into the lead-out pipe fixing hole. The top center of the refrigeration and dehumidification backflow block 56 is... A stepped circular hole is provided, and a T-shaped connecting rod 55 is inserted into the stepped circular hole of the refrigeration and dehumidification backflow block 56. The bottom end of the T-shaped connecting rod 55 has a circular countersunk hole along the axial direction that communicates with the rear section 322 of the outlet pipe. The inner wall of the lower part of the circular countersunk hole is machined with internal threads. The top end of the spiral cooling pipe 52 is spirally installed at the bottom of the circular countersunk hole of the T-shaped connecting rod 55. A condensate collector 53 is provided on the outside of the spiral cooling pipe 52. The top end of the condensate collector 53 is connected to the bottom end of the refrigeration and dehumidification backflow block 56. A semiconductor cooling chip 51 is installed on the top end of the refrigeration and dehumidification backflow block 56. An L-shaped dry flue gas backflow hole is provided on the outer wall of the other side of the refrigeration and dehumidification backflow block 56. One end of the L-shaped dry flue gas backflow hole is connected to the condensate collector 53, and the other end of the L-shaped dry flue gas backflow hole is connected to a dry flue gas outlet 54.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The difference between this device and other equipment in measuring flue gas temperature is that the flue gas temperature sensor 15 does not directly contact the flue gas being measured. Because the condensate droplets generated after flue gas condensation and heat exchange have supercooling (i.e., the droplets are lower than the flue gas temperature), typically 3–5°C, and sometimes as high as 8–10°C, direct contact temperature measurement of flue gas containing supercooled droplets would lead to inaccurate measurements. This device inserts the flue gas temperature sensor 15 into the sampling inner tube 13, directly measuring the wet flue gas after the condensate droplets have been separated, thus obtaining a more accurate flue gas temperature.

[0019] Since flue gas temperature is crucial for calculating parameters such as flue gas moisture content and saturated vapor pressure, it needs to be calibrated periodically. In this device, the flue gas temperature sensor 15 is inserted from the front end of the double-sleeved reverse sampling unit 1, rather than from the rear end. This design has at least three advantages:

[0020] 1. Since the smoke temperature sensor 15 has its smoke temperature probe installed inside the sampling inner tube 13, the diameter of the sampling inner tube 13 is reduced, and the flow velocity of the smoke sample in the sampling inner tube 13 increases significantly, which leads to a significant reduction in the residence time of the smoke sample in the sampling inner tube 13 and a weakening of the heating effect. However, since the smoke temperature sensor 15 has its smoke temperature probe inserted directly from the front end, it will not affect the flow path of the smoke sample.

[0021] 2. The temperature measuring point of the flue gas temperature sensor 15 is set at the connection between the sampling inlet 11 of the double-layer sleeve and the sampling inner tube 13. Since the self-heating effect will weaken with the increase of distance, the further away from the temperature measuring point, the greater the error of flue gas temperature measurement may be. The flue gas temperature sensor 15 can be accurately inserted into the temperature measuring point by probing from the front end.

[0022] 3. When the user needs to calibrate the sensor, simply unscrew the smoke temperature sensor protective cover 17 and pull out the smoke temperature sensor 15 for calibration. At the same time, when the user needs to replace the double-layer sleeve reverse sampling unit 1 with a different length, simply take out the smoke temperature sensor 15 along the smoke temperature sensor sleeve 16, replace the double-layer sleeve reverse sampling unit 1, and then install the smoke temperature sensor 15 along the smoke temperature sensor sleeve 16. The user does not need to replace the smoke temperature sensor 15 and avoid recalibrating it. Only a certain length of wire needs to be reserved in the smoke gun. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the heat-traced condensate flue gas temperature and humidity measuring device of the present invention;

[0024] Figure 2 This is an internal structural diagram of the heat-traced condensate flue gas temperature and humidity measuring device of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the double-layer sleeve reverse sampling unit 1 of the present invention;

[0026] Figure 4 This is an internal structural diagram of the double-layer sleeve reverse sampling unit 1 of the present invention;

[0027] Figure 5 This is an internal structural diagram of the temperature and humidity sensor measuring unit 4 and the inner tube flue gas outlet pipe 32 after assembly according to the present invention.

[0028] Figure 6 This is an internal structural diagram of the refrigeration and dehumidification unit 5 of the present invention;

[0029] Figure 7 This is a diagram showing the internal structure of the double-layered sleeve sampling inlet 11 of the present invention.

[0030] In the diagram: 1-Double-layer sleeve reverse sampling unit; 10-Sleeve rear end fixing plate; 11-Double-layer sleeve sampling inlet; 111-Inlet inner tube; 112-Inlet outer tube; 113-Air inlet; 114-Insertion tube; 12-Sampling outer tube; 13-Sampling inner tube; 14-S-type Pitot tube; 15-Smoke temperature sensor; 16-Smoke temperature sensor sleeve; 17-Smoke temperature sensor protective cover; 18-Sampling unit fixing plate; 19-Sleeve front end fixing plate; 2-Heat insulation and flow guiding unit; 21-Flue gas flow guiding channel I; 22-Flue gas flow guiding channel II; 3-Rapid heat tracing unit; 31-Heat tracing pipeline; 32-Inner tube flue gas outlet pipe; 321-Outlet pipe front section; 322-Outlet pipe rear section ; 323-Front expansion structure; 324-Gas chamber; 325-Rear expansion structure; 326-Temperature equalization baffle I; 327-Temperature equalization baffle II; 328-External pipe flue gas exhaust port; 33-External pipe flue gas outlet pipe; 4-Temperature and humidity sensor measurement unit; 41-Capacitive temperature and humidity sensor; 42-Temperature and humidity sensor sleeve; 43-Gas sensor; 44-Gas sensor sleeve; 45-Sensor mounting housing; 5-Refrigeration and dehumidification unit; 51-Semiconductor cooling chip; 52-Spiral cooling pipe; 53-Condensate collector; 54-Dry flue gas outlet; 55-T-type connecting rod; 56-Refrigeration and dehumidification backflow block; 57-Outlet pipe fixing plate; 58-Heat tracing pipeline connection. Detailed Implementation

[0031] Specific implementation method one: Combining Figures 1 to 7This embodiment describes a heat-traced condensate flue gas temperature and humidity measuring device, which includes a double-layered tube reverse sampling unit 1, a heat-insulating flow guiding unit 2, a rapid heat tracing unit 3, a temperature and humidity sensor measuring unit 4, and a refrigeration and dehumidification unit 5. The double-layered tube reverse sampling unit 1, the heat-insulating flow guiding unit 2, the rapid heat tracing unit 3, and the refrigeration and dehumidification unit 5 are connected sequentially from front to back. The temperature and humidity sensor measuring unit 4 is installed at the end of the rapid heat tracing unit 3 closest to the refrigeration and dehumidification unit 5. The heat-insulating flow guiding unit 2 has a cylindrical structure and a through flue gas flow guiding channel I. The double-layered reverse sampling unit 1 includes a double-layered sampling inlet 11, an outer sampling tube 12, an inner sampling tube 13, a front end fixing plate 19, a rear end fixing plate 10, and a smoke temperature sensor 15. The front end fixing plate 19 and the rear end fixing plate 10 are respectively installed at the front and rear ends of the outer sampling tube 12. The inner sampling tube 13 is inserted into the inner hole of the outer sampling tube 12. The front and rear ends of the inner sampling tube 13 are respectively fixedly connected to the front end fixing plate 19 and the rear end fixing plate 10 of the sleeve. The smoke temperature sensor 15 is inserted into the inner hole at the front end of the inner sampling tube 13. The rear end of the inner sampling tube 13 is inserted into the smoke flow channel I of the heat insulation guiding unit 2. At the front end of sampling pipe 12 and sampling pipe 13, near the flue gas temperature sensor 15, a double-layered sampling inlet 11 is installed. The rapid heat tracing unit 3 includes a heat tracing pipe 31, an inner flue gas outlet pipe 32, and an outer flue gas outlet pipe 33. The inner flue gas outlet pipe 32 and the outer flue gas outlet pipe 33 are inserted in parallel in the inner hole of the heat tracing pipe 31. The front end of the inner flue gas outlet pipe 32 is inserted into the flue gas guiding channel I of the heat insulation guiding unit 2. The rear end of the sampling tube 12 is connected to the inner hole of the sampling inner tube 13. The rear end of the inner tube flue gas outlet pipe 32 is connected to the air inlet of the refrigeration and dehumidification unit 5. A temperature and humidity sensor measurement unit 4 is installed on the inner tube flue gas outlet pipe 32. An outer tube flue gas exhaust port 328 is installed on the temperature and humidity sensor measurement unit 4. The front end of the outer tube flue gas outlet pipe 33 is inserted into the rear end of the flue gas guide channel II22 of the heat insulation guide unit 2 and is connected to the annular gap between the sampling outer tube 12 and the sampling inner tube 13. The rear end of the outer tube flue gas outlet pipe 33 is connected to the outer tube flue gas exhaust port 328.

[0032] In this embodiment, the function of the heat insulation and diversion unit 2 is to prevent the smoke temperature sensor 15 from measuring too high due to heat conduction during the heating process of the rapid heat tracing unit 3. The double-layer sleeve reverse sampling unit 1 is connected to the smoke gun using this heat insulation and diversion unit 2. Instead of using a heat-conducting material at the connection, a PEEK material with slow heat conduction, corrosion resistance, and wear resistance is used. At the same time, the heat insulation and diversion unit 2 converts the double-layer sleeve exhaust structure into a parallel configuration of the inner pipe smoke outlet pipe 32 and the outer pipe smoke outlet pipe 33. This allows for faster heat tracing and temperature control of the entire pipeline system, thereby shortening the length of the heat tracing pipeline 31.

[0033] In this embodiment, the rapid heat tracing unit 3 also includes a heater and a high-speed PID temperature controller. The heater is wound around the outer wall of the inner flue gas outlet pipe 32, and the high-speed PID temperature controller is externally mounted and connected to the heater via wires. The function of the rapid heat tracing unit 3 is to quickly heat and maintain the temperature of the entire pipeline system, preventing secondary condensation of the flue gas sample, while heating the flue gas sample and the temperature and humidity sensor measurement unit 4 to the set value. Since the flue gas temperature changes constantly, in order to ensure that the fluctuation of the heat tracing temperature is less than ±0.1℃, the heater has a power of up to 200 watts, which significantly reduces the heating time. At the same time, to obtain better temperature control accuracy, a high-speed PID temperature controller is used, with a sampling period of only 50 milliseconds.

[0034] Specific Implementation Method Two: Combining Figure 3 , Figure 4 and Figure 7 This embodiment describes a double-walled sampling inlet 11 comprising an inner inlet tube 111 and an outer inlet tube 112. The inner inlet tube 111 is coaxially inserted into the inner hole of the outer inlet tube 112. The front sidewalls of the outer sampling tube 12 and the inner sampling tube 13 are respectively provided with coaxially arranged external and internal sampling inlet insertion holes. The outer inlet tube 112 is coaxially inserted into the external sampling inlet insertion hole and is sealed to the outer sampling tube 12. The outer inlet tube 112 has an external thread that matches the external sampling nozzle. The inner inlet tube 111 coaxially passes through the wall of the outer sampling tube 12 and is inserted into the internal sampling inlet insertion hole of the inner sampling tube 13 and is sealed to the inner sampling tube 13. With this configuration, the double-layered tube sampling inlet 11 effectively separates wet flue gas from condensate droplets. The outer inlet tube 112 has external threads, allowing for the selection of different sampling nozzles based on the on-site flow velocity to achieve isokinetic sampling. Under isokinetic sampling, the in-situ flue gas enters the double-layered tube sampling inlet 11 without damage. The annular gap area between the inner inlet tube 111 and the outer inlet tube 112 is very small, which can instantly increase the flue gas velocity by 3 to 5 times. Other components and connections are the same as in Specific Implementation Method 1.

[0035] Specific implementation method three: Combining Figure 4In this embodiment, the annular gap between the inlet inner tube 111 and the inlet outer tube 112 is connected to the annular gap between the sampling outer tube 12 and the sampling inner tube 13. The inner hole of the inlet inner tube 111 of the double-layered tube sampling inlet 11 is connected to the inner hole of the sampling inner tube 13. Multiple air inlets 113 with the same diameter are evenly opened along the circumferential direction on the wall of the inlet inner tube 111, and the centers of the multiple air inlets 113 are located on the same plane. With this configuration, multiple air inlets 113 are evenly distributed around the wall of the inlet inner tube 111, and the diameter of each air inlet 113 is the same. The constant flow range of the sampling inlet inner tube 111 is generally between (3~5) L / min. The flow velocity of the flue gas sample flowing into each air inlet 113 around the inlet inner tube 111 is only one-tenth of the flow velocity in the annular gap between the inlet inner tube 111 and the inlet outer tube 112. Based on the principle of inertia and the Bassat-Boussinesq-Qseen (BBO) equation, which states that the droplet's following ability to the fluid medium decreases with changes in fluid velocity (here, velocity change refers to direction change), wet flue gas and condensed droplets can be separated efficiently. The separated flue gas samples enter the inner sampling tube 13 and the outer sampling tube 12, respectively. Both the inner and outer sides of the inner sampling tube 13 contain in-situ flue gas, achieving a self-heating effect through heat conduction during sampling. The gas then flows through the heat-insulating and guiding unit 2 and towards the rear of the flue gas gun. Other components and connections are the same as in specific implementation methods one or two.

[0036] Specific implementation method four: Combination Figure 7 In this embodiment, an external sampling nozzle is coaxially inserted into the upper part of the annular gap between the inner inlet tube 111 and the outer inlet tube 112. The annular gap between the insert tube 114 and the inner inlet tube 111 is equal to the annular gap between the insert tube 114 and the outer inlet tube 112. Multiple air inlets 113 are located in the middle of the insert tube 114, and the lower surface of the short plate at the top of the insert tube 114 contacts the upper surface of the sampling inner tube 13. With this configuration, the sample flue gas from the external sampling nozzle enters the annular gap between the inner inlet tube 111 and the outer inlet tube 112 through the annular gap between the insert tube 114 and the outer inlet tube 112. A portion of the sample flue gas flows directly into the annular gap between the outer sampling tube 12 and the inner sampling tube 13; another portion of the sample flue gas enters the annular gap between the insert tube 114 and the inner inlet tube 111 after one turn, and after a second turn, enters the inner hole of the inner inlet tube 111 through the multiple air inlets 113, and finally flows into the inner hole of the sampling inner tube 13. Other components and connections are the same as in specific implementation methods one, two, or three.

[0037] Specific Implementation Method Five: Combining Figure 3 and Figure 4This embodiment describes a double-walled reverse sampling unit 1 that further includes a smoke temperature sensor sleeve 16, a smoke temperature sensor protective cover 17, a sampling unit fixing plate 18, and an S-shaped Pitot tube 14. The probe of the smoke temperature sensor 15 is inserted into the inner hole of the sampling inner tube 13 from its front end. The temperature measurement point of the probe of the smoke temperature sensor 15 is located at the connection between the double-walled sampling inlet 11 and the sampling inner tube 13. The tail end of the smoke temperature sensor 15 is mounted on the front fixing plate 19 of the sleeve via the smoke temperature sensor sleeve 16. The outer cover of the sensor sleeve 16 is equipped with a smoke temperature sensor protective cover 17, which is detachably connected to the front end fixing plate 19 of the sleeve. A sampling unit fixing plate 18 is coaxially fitted onto the rear wall of the sampling outer tube 12. The sampling unit fixing plate 18 is detachably connected to the front end of the heat insulation and flow guiding unit 2 via fastening screws. An S-shaped Pitot tube 14 is arranged along the length of the sampling outer tube 12 on its exterior. The front and rear ends of the S-shaped Pitot tube 14 are fixedly connected to the outer wall of the sampling outer tube 12 via two tube supports. With this configuration, the double-layer sleeve reverse sampling unit 1 can be easily disassembled as a separate component; simply remove the fastening screws at the sampling unit fixing plate 18. Then, different lengths of the double-layer sleeve reverse sampling unit 1 can be selected according to the diameter of the flue to be measured. During carrying and transportation, the double-layer sleeve reverse sampling unit 1 can be disassembled, significantly reducing the length of the smoke gun and making it very convenient for users to carry, while also ensuring the adaptability of the device. Other components and connections are the same as in specific embodiments one, two, three, or four.

[0038] Specific Implementation Method Six: Combination Figure 2 and Figure 5This embodiment describes the inner flue gas outlet pipe 32, which includes a front section 321, a rear section 322, a front expansion structure 323, a gas chamber 324, and a rear expansion structure 325. The gas chamber 324 is a circular tubular structure. Both the front expansion structure 323 and the rear expansion structure 325 are hollow frustum-shaped structures with openings at both ends. The front expansion structure 323 and the rear expansion structure 325 are respectively arranged opposite to each other on the front and rear sides of the gas chamber 324. The large-diameter end of the front expansion structure 323 is connected to the front end of the gas chamber 324, and the small-diameter end of the front expansion structure 323 is connected to the rear end of the front section 321. The rear end of the front section 321 is inserted into the flue gas guiding channel I of the heat insulation guiding unit 2. Inside section 21, the large-diameter end of the rear-expanded hole structure 325 is connected to the rear end of the air chamber 324, and the small-diameter end of the rear-expanded hole structure 325 is connected to the front end of the rear section 322 of the outlet pipe. The rear end of the rear section 322 of the outlet pipe is connected to the flue gas inlet of the refrigeration and dehumidification unit 5. With this configuration, to improve the accuracy and stability of temperature and humidity measurement, the temperature of the air chamber 324 must first be heated to the set value by the rapid heating unit 3, and the fluctuation of the constant temperature must be less than ±0.1℃ to ensure the stability of humidity measurement. Since the response speed of the temperature and humidity sensor is much slower than that of the resistance temperature detector (PT100), a resistance temperature detector (PT100) is added inside the air chamber 324 for rapid heating control to achieve this target. To ensure accurate temperature and humidity measurements, the flow velocity of the flue gas passing through the sensor cannot be too high. Otherwise, the dynamic temperature at the sensor measurement point will not be completely stopped, resulting in the measurement of the effective temperature instead of the total temperature, leading to measurement errors. Therefore, a flared structure is used between the inner flue gas outlet pipe 32 and the gas chamber 324 to reduce the flue gas velocity entering the gas chamber 324. This ensures measurement accuracy while further improving the uniformity of the temperature and humidity field. To improve the sensitivity of the temperature and humidity sensor, the volume of the gas chamber 324 is also strictly limited to minimize its volume, ensuring that changes in the sample temperature and humidity within the gas chamber 324 do not cause lag. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0039] Specific implementation method seven: Combination Figure 2 and Figure 5In this embodiment, the inner flue gas outlet pipe 32 further includes a temperature equalization baffle I 326 and a temperature equalization baffle II 327. Temperature equalization baffles I 326 and II 327 are installed sequentially from front to back at the air inlet of the gas chamber 324. Multiple small holes are evenly distributed on both temperature equalization baffles I 326 and II 327. This arrangement, to obtain more accurate temperature and humidity measurement results, involves two very thin stainless steel temperature equalization baffles (i.e., temperature equalization baffles I 326 and II 327) installed at the air inlet of the entire gas chamber 324. Each temperature equalization baffle has many evenly distributed small holes. When flue gas passes through the temperature equalization baffles, it is evenly filled into the entire gas chamber 324, making the temperature and humidity field within the entire gas chamber 324 more uniform, ensuring that the measurement results of the temperature and humidity sensor can accurately reflect the actual state of the flue gas. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0040] Specific implementation method eight: Combination Figure 5 This embodiment describes a temperature and humidity sensor measurement unit 4 comprising a capacitive temperature and humidity sensor 41, a temperature and humidity sensor sleeve 42, a gas sensor 43, and a gas sensor sleeve 44. Sensor insertion holes I and II are respectively provided on the upper and lower side walls of the gas chamber 324. The probes of the capacitive temperature and humidity sensor 41 and the gas sensor 43 pass through sensor insertion holes I and II respectively and are inserted into the gas chamber 324. The tail portions of the capacitive temperature and humidity sensor 41 and the gas sensor 43 are respectively inserted into the inner holes of the temperature and humidity sensor sleeve 42 and the gas sensor sleeve 44. The temperature and humidity sensor sleeve 42 and the gas sensor sleeve 44 are respectively sealed and installed in sensor insertion holes I and II. With this configuration, the measurement accuracy of ordinary temperature and humidity sensors is only ±3.0%FS or lower. This device, through the temperature and humidity sensor measurement unit 4 and the inner tube flue gas outlet pipe 32, significantly improves both the measurement accuracy and stability of the sensors. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0041] Specific Implementation Method Nine: Combining Figure 1 , Figure 2 and Figure 5In this embodiment, the temperature and humidity sensor measuring unit 4 further includes a sensor mounting housing 45. Sensor mounting clearance holes I and II are respectively provided on the upper and lower side walls of the heat tracing pipe 31. Sensor mounting clearance holes I and II correspond one-to-one with sensor insertion holes I and II, respectively. The sensor mounting housing 45 is fitted onto the sensor mounting clearance holes I and II of the heat tracing pipe 31, and the sensor mounting housing 45 is sealed to the outer wall of the heat tracing pipe 31. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, seven, or eight.

[0042] Specific Implementation Method Ten: Combining Figure 1 , Figure 2 and Figure 6This embodiment describes a refrigeration and dehumidification unit 5, which includes a semiconductor cooling chip 51, a spiral cooling tube 52, a condensate collector 53, a dry flue gas outlet 54, a T-shaped connecting rod 55, a refrigeration and dehumidification backflow block 56, a lead-out pipe fixing plate 57, and a heat tracing pipe connection 58. The refrigeration and dehumidification backflow block 56 is a circular cylindrical structure, vertically arranged behind the heat tracing pipe 31. An integrally formed annular flange is provided on one outer wall of the refrigeration and dehumidification backflow block 56, and the rear end of the heat tracing pipe 31 is inserted into the inner hole of the annular flange. A lead-out pipe fixing hole is provided on one outer wall of the refrigeration and dehumidification backflow block 56, and the rear end of the lead-out pipe 322 is inserted into the inner hole of the lead-out pipe fixing plate 57. The lead-out pipe fixing plate 57 is inserted into the lead-out pipe fixing hole. A stepped circular hole is opened at the center of the top, and a T-shaped connecting rod 55 is inserted into the stepped circular hole of the refrigeration and dehumidification backflow block 56. A circular countersunk hole communicating with the rear section 322 of the outlet pipe is opened along the axial direction at the bottom end of the T-shaped connecting rod 55. The inner wall of the lower part of the circular countersunk hole is machined with internal threads. The top end of the spiral cooling pipe 52 is spirally installed at the bottom of the circular countersunk hole of the T-shaped connecting rod 55. A condensate collector 53 is provided on the outside of the spiral cooling pipe 52. The top end of the condensate collector 53 is connected to the bottom end of the refrigeration and dehumidification backflow block 56. A semiconductor cooling chip 51 is installed on the top end of the refrigeration and dehumidification backflow block 56. An L-shaped dry flue gas backflow hole is opened on the outer wall of the other side of the refrigeration and dehumidification backflow block 56. One end of the L-shaped dry flue gas backflow hole is connected to the condensate collector 53, and the other end of the L-shaped dry flue gas backflow hole is connected to a dry flue gas outlet 54. In this configuration, the cooling and dehumidifying unit 5 removes moisture from the flue gas sample while simultaneously lowering its temperature, ensuring the analytical equipment can directly and accurately measure the components within the sample. To achieve rapid cooling, a high-power semiconductor cooling chip 51 is used to cool the rapid cooling module. This module, designed for lower specific heat capacity and higher heat exchange efficiency, utilizes aerospace aluminum with lower density and is coated with Teflon to prevent corrosion. A spiral cooling pipe 52 further cools the flue gas, increasing the contact area and enhancing the cooling effect. Condensate is collected in the condensate collector 53, while dry flue gas is discharged through the dry flue gas outlet 54 into the analytical equipment. Other components and connections are the same as in embodiments one, two, three, four, five, six, seven, eight, or nine.

[0043] Working principle

[0044] Combination Figures 1 to 7The working principle of the heat-traced condensate flue gas temperature and humidity measuring device of the present invention is as follows: This device adopts a double-layer sleeve reverse air extraction sampling method to separate the wet flue gas from the condensate droplets. The temperature of the wet flue gas is accurately measured at the flue gas inlet in the sampling inner tube 13. Then, the rapid heat tracing unit 3 heats the extracted wet flue gas to a higher temperature to avoid secondary condensation of water vapor in the flue gas. At the same time, since the rapid heat tracing unit 3 heats the flue gas with equal humidity, the moisture content of the flue gas remains unchanged throughout the heating process. The temperature and humidity of the heated flue gas are measured by the capacitive temperature and humidity sensor 41, and finally the parameters such as the moisture content and saturated vapor pressure of the flue gas are calculated.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat-traced condensate flue gas temperature and humidity measuring device, characterized in that: It includes a double-walled reverse sampling unit (1), a heat insulation and flow guiding unit (2), a rapid heat tracing unit (3), a temperature and humidity sensor measurement unit (4), and a cooling and dehumidifying unit (5). The double-walled reverse sampling unit (1), the heat insulation and flow guiding unit (2), the rapid heat tracing unit (3), and the cooling and dehumidifying unit (5) are connected sequentially from front to back. The temperature and humidity sensor measurement unit (4) is installed at the end of the rapid heat tracing unit (3) near the cooling and dehumidifying unit (5). The heat insulation and flow guiding unit (2) has a cylindrical structure and has a through flue gas flow guiding channel I (21) and a flue gas flow guiding channel II (22). The double-walled reverse sampling unit (1) includes a double-walled sampling inlet (11). The outer sampling tube (12), the inner sampling tube (13), the front end fixing plate (19), the rear end fixing plate (10), and the smoke temperature sensor (15) are arranged in a sampling outer tube (12). The front end fixing plate (19) and the rear end fixing plate (10) are respectively installed at the front and rear ends of the outer sampling tube (12). The inner sampling tube (13) is inserted into the inner hole of the outer sampling tube (12). The front and rear ends of the inner sampling tube (13) are respectively fixedly connected to the front end fixing plate (19) and the rear end fixing plate (10) of the sleeve. The smoke temperature sensor (15) is inserted into the inner hole at the front end of the inner sampling tube (13). The rear end of the inner sampling tube (13) is inserted into the front end of the flue gas guiding channel I (21) of the heat insulation guiding unit (2). The outer sampling tube (12) and the inner sampling tube (13) are arranged in a sampling inner tube (14). 3) A double-layered tube sampling inlet (11) is installed on the front side near the flue gas temperature sensor (15). The rapid heat tracing unit (3) includes a heat tracing pipe (31), an inner tube flue gas outlet pipe (32), and an outer tube flue gas outlet pipe (33). The inner tube flue gas outlet pipe (32) and the outer tube flue gas outlet pipe (33) are inserted in parallel in the inner hole of the heat tracing pipe (31). The front end of the inner tube flue gas outlet pipe (32) is inserted into the rear end of the flue gas guiding channel I (21) of the heat insulation guiding unit (2) and communicates with the inner hole of the sampling inner tube (13). The rear end of the inner tube flue gas outlet pipe (32) is connected to the air inlet of the refrigeration and dehumidification unit (5). A temperature and humidity sensor measurement unit (4) is installed on the inner tube flue gas outlet pipe (32). The sensor measurement unit (4) is equipped with an outer tube flue gas exhaust port (328). The front end of the outer tube flue gas outlet pipe (33) is inserted into the rear end of the flue gas guiding channel II (22) of the heat insulation guiding unit (2) and communicates with the annular gap between the sampling outer tube (12) and the sampling inner tube (13). The rear end of the outer tube flue gas outlet pipe (33) is connected to the outer tube flue gas exhaust port (328). The double-layer sleeve sampling inlet (11) includes an inlet inner tube (111) and an inlet outer tube (112). The inlet inner tube (111) is coaxially inserted into the inner hole of the inlet outer tube (112). The inlet inner tube (111) has multiple air inlets (113) with the same diameter evenly opened along the circumferential direction. The centers of the multiple air inlets (113) are located on the same plane. The inner flue gas outlet pipe (32) includes a front section (321), a rear section (322), a front expansion structure (323), a gas chamber (324), and a rear expansion structure (325); the inner flue gas outlet pipe (32) also includes a temperature equalization baffle I (326) and a temperature equalization baffle II (327), and the temperature equalization baffle I (326) and the temperature equalization baffle II (327) are installed sequentially from front to back at the air inlet of the gas chamber (324); the heat insulation and flow guiding unit (2) is made of PEEK material; the rapid heat tracing unit 3 also includes a heater and a high-speed PID temperature controller, the heater is wound around the outer wall of the inner flue gas outlet pipe 32, the high-speed PID temperature controller is externally installed, the high-speed PID temperature controller is connected to the heater through a wire, and the high-speed PID temperature controller controls the fluctuation of the heat tracing temperature within ±0.1℃.

2. The heat-traced condensate flue gas temperature and humidity measuring device according to claim 1, characterized in that: The front sidewalls of the sampling outer tube (12) and the sampling inner tube (13) are respectively provided with a sampling inlet external insertion hole and a sampling inlet internal insertion hole arranged coaxially. The inlet outer tube (112) is coaxially inserted into the sampling inlet external insertion hole. The inlet outer tube (112) is sealed to the sampling outer tube (12). The outer side of the inlet outer tube (112) is machined with an external thread that matches the external sampling nozzle. The inlet inner tube (111) coaxially passes through the tube wall of the sampling outer tube (12) and is inserted into the sampling inlet internal insertion hole of the sampling inner tube (13). The inlet inner tube (111) is sealed to the sampling inner tube (13).

3. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 1 or 2, characterized in that: The annular gap between the inner inlet tube (111) and the outer inlet tube (112) is connected to the annular gap between the outer sampling tube (12) and the inner sampling tube (13). The inner hole of the inner inlet tube (111) of the double-layer tube sampling inlet (11) is connected to the inner hole of the inner sampling tube (13).

4. The heat-traced condensate flue gas temperature and humidity measuring device according to claim 3, characterized in that: An external sampling nozzle is coaxially inserted into the upper part of the annular gap between the inner inlet tube (111) and the outer inlet tube (112). The annular gap between the tube (114) and the inner inlet tube (111) is equal to the annular gap between the tube (114) and the outer inlet tube (112). Multiple air inlets (113) are located in the middle of the tube (114). The lower surface of the short plate at the top of the tube (114) is in contact with the upper surface of the sampling inner tube (13).

5. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 1 or 4, characterized in that: The double-walled reverse sampling unit (1) also includes a smoke temperature sensor sleeve (16), a smoke temperature sensor protective cover (17), a sampling unit fixing plate (18), and an S-shaped Pitot tube (14). The probe of the smoke temperature sensor (15) is inserted into the inner hole of the sampling inner tube (13) from the front end. The temperature measuring point of the probe of the smoke temperature sensor (15) is set at the connection between the double-walled sampling inlet (11) and the sampling inner tube (13). The tail end of the smoke temperature sensor (15) is mounted on the front fixing plate (19) of the sleeve through the smoke temperature sensor sleeve (16). The outer cover is equipped with a smoke temperature sensor protective cover (17), which is detachably connected to the front end fixing plate (19) of the sleeve. The rear wall of the sampling outer tube (12) is coaxially fitted with a sampling unit fixing plate (18), which is detachably connected to the front end of the heat insulation and flow guiding unit (2) by fastening screws. The S-shaped Pitot tube (14) is arranged outside the sampling outer tube (12) along the length direction of the sampling outer tube (12). The front and rear ends of the S-shaped Pitot tube (14) are fixedly connected to the outer wall of the sampling outer tube (12) by two tube supports.

6. The heat-traced condensate flue gas temperature and humidity measuring device according to claim 5, characterized in that: The air chamber (324) is a circular tubular structure. The front expansion structure (323) and the rear expansion structure (325) are both hollow frustum structures with open ends. The front expansion structure (323) and the rear expansion structure (325) are respectively arranged opposite to each other on the front and rear sides of the air chamber (324). The large diameter end of the front expansion structure (323) is connected to the front end of the air chamber (324), and the small diameter end of the front expansion structure (323) is connected to the rear end of the front section (321) of the outlet pipe. The rear end of the front section (321) of the outlet pipe is inserted into the flue gas guide channel I (21) of the heat insulation guide unit (2). The large diameter end of the rear expansion structure (325) is connected to the rear end of the air chamber (324), and the small diameter end of the rear expansion structure (325) is connected to the front end of the rear section (322) of the outlet pipe. The rear end of the rear section (322) of the outlet pipe is connected to the flue gas inlet of the refrigeration and dehumidification unit (5).

7. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 6, characterized in that: Multiple small holes are evenly distributed on temperature equalization plate I (326) and temperature equalization plate II (327).

8. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 7, characterized in that: The temperature and humidity sensor measurement unit (4) includes a capacitive temperature and humidity sensor (41), a temperature and humidity sensor sleeve (42), a gas sensor (43), and a gas sensor sleeve (44). Sensor socket I and sensor socket II are respectively opened on the upper and lower side walls of the gas chamber (324). The probes of the capacitive temperature and humidity sensor (41) and the gas sensor (43) pass through the sensor socket I and the sensor socket II respectively and are inserted into the gas chamber (324). The tail parts of the capacitive temperature and humidity sensor (41) and the gas sensor (43) are respectively inserted into the inner holes of the temperature and humidity sensor sleeve (42) and the gas sensor sleeve (44). The temperature and humidity sensor sleeve (42) and the gas sensor sleeve (44) are respectively sealed and installed in the sensor socket I and the sensor socket II.

9. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 8, characterized in that: The temperature and humidity sensor measurement unit (4) also includes a sensor mounting housing (45). Sensor mounting clearance holes I and II are respectively opened on the upper and lower side walls of the heat tracing pipe (31). Sensor mounting clearance holes I and II correspond one-to-one with sensor socket I and sensor socket II respectively. The sensor mounting housing (45) is fitted onto the sensor mounting clearance holes I and II of the heat tracing pipe (31). The sensor mounting housing (45) is sealed to the outer wall of the heat tracing pipe (31).

10. A heat-traced condensate flue gas temperature and humidity measuring device according to claim 9, characterized in that: The refrigeration and dehumidification unit (5) includes a semiconductor cooling chip (51), a spiral cooling tube (52), a condensate collector (53), a dry flue gas outlet (54), a T-shaped connecting rod (55), a refrigeration and dehumidification backflow block (56), a lead-out pipe fixing plate (57), and a heat tracing pipeline connection (58). The refrigeration and dehumidification backflow block (56) is a circular cylindrical structure. The refrigeration and dehumidification backflow block (56) is vertically arranged behind the heat tracing pipeline (31). An integrally formed annular flange is provided on one side of the outer wall of the refrigeration and dehumidification backflow block (56). The rear end of the heat tracing pipeline (31) is inserted into the inner hole of the annular flange. A lead-out pipe fixing hole is opened on one side of the outer wall of the refrigeration and dehumidification backflow block (56). The rear end of the lead-out pipe (322) is inserted into the inner hole of the lead-out pipe fixing plate (57). The lead-out pipe fixing plate (57) is inserted into the lead-out pipe fixing hole. The top of the refrigeration and dehumidification backflow block (56) is in the center of the center. The core has a stepped circular hole, and the T-shaped connecting rod (55) is inserted into the stepped circular hole of the refrigeration and dehumidification backflow block (56). The bottom end of the T-shaped connecting rod (55) has a circular countersunk hole that communicates with the rear section (322) of the outlet pipe along the axial direction. The inner wall of the lower part of the circular countersunk hole is machined with internal threads. The top end of the spiral cooling pipe (52) is spirally installed at the bottom of the circular countersunk hole of the T-shaped connecting rod (55). The spiral cooling pipe (52) is covered with a condensate collector (53). The top end of the condensate collector (53) is connected to the bottom end of the refrigeration and dehumidification backflow block (56). The top end of the refrigeration and dehumidification backflow block (56) is equipped with a semiconductor cooling chip (51). The outer wall of the other side of the refrigeration and dehumidification backflow block (56) has an L-shaped dry flue gas backflow hole. One end of the L-shaped dry flue gas backflow hole is connected to the condensate collector (53), and the other end of the L-shaped dry flue gas backflow hole is connected to a dry flue gas outlet (54) inserted therein.

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