A heat transfer pipe heat exchanger and flow resistance performance integrated testing device

Abstract

The utility model discloses a kind of heat pipe heat exchange and flow resistance performance integration test device of strengthening heat transfer, comprising: atmospheric device, hot air inlet collection section, test section, hot air outlet collection section, hot air inlet pressure P1 detection port, hot air inlet temperature T1 detection port, water temperature T0 detection port blow-off port, hot air outlet pressure P2 detection port, hot air temperature T2 detection port, blow-off port and water level gauge.Temperature field is more uniform, higher testing accuracy, while reducing safety risk;Adopt multi-point temperature pressure monitoring, heat exchange and flow resistance performance can be measured simultaneously;The measured element and test section are connected using thread, different test elements can be conveniently replaced, test cost is reduced and test time is reduced;Adopting atmospheric volumetric test system water temperature keeps boiling state, keeps temperature constant, different operating conditions can be simulated by adjusting air intake parameter, and performance test result is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of thermal testing technology, and is particularly applicable to an integrated testing device for enhancing the heat transfer performance and flow resistance performance of heat transfer flue pipes. Background Technology

[0002] Flue tubes are the main heat transfer elements of shell-type steam or hot water boilers. Because the longitudinal scouring heat transfer coefficient of the gas inside the tube is much lower than that of the water outside, the heat transfer coefficient of traditional flue tubes is relatively low. To enhance heat transfer in flue tubes, various turbulence-enhancing heat transfer elements have been developed, such as internally inserted turbulence generators, springs, flat steel strips, and threaded flue tubes. In recent years, composite flue tubes with internal aluminum fins have emerged. The emergence of these enhanced heat transfer elements necessitates an integrated testing device to perform heat transfer and flow resistance performance tests on these various enhanced heat transfer flue tubes. Currently, performance testing of enhanced heat transfer elements mostly uses separate equipment. Heat transfer and flow resistance tests require different platforms, resulting in poor data coordination; insufficient flexibility in adjusting to varying operating conditions; and low temperature control accuracy. Furthermore, the test section is a welded, fixed structure, making it impossible to replace different test elements. Utility Model Content

[0003] The purpose of this invention is to provide an integrated testing device for enhancing the heat transfer and flow resistance performance of heat transfer flues. This device features a test section with replaceable heat transfer elements, can simultaneously measure the heat transfer coefficient and resistance coefficient, and can achieve variable operating condition adjustment, providing high-precision measurement capabilities.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] An integrated testing device for enhancing the heat transfer and flow resistance performance of a heat transfer flue includes a hot air inlet / outlet collection section and a testing section. The device is arranged vertically. Hot air enters the enhanced heat transfer flue in the testing section from the gas inlet section and exchanges heat with water in the testing section until it reaches a stable boiling state. In order to maintain constant pressure and prevent the testing section from being pressurized, an atmospheric venting device is installed in the testing section. The hot air after heat exchange is discharged from the device through the gas outlet section. Pressure detection ports P1 (P2) and temperature detection ports T1 (T2) are installed in the gas inlet / outlet section, respectively. Temperature measuring point (T3) is installed in the testing section. The heat exchange medium water is injected into the heat exchange chamber from the expansion chamber of the atmospheric venting device. After the test is completed, the water in the heat exchange chamber is drained from the drain port 6.

[0006] The hot air inlet (outlet) collection section includes a collection chamber cylinder, a test section connecting flange, and a hot air inlet (outlet) flange. Temperature detection ports (T1, T2) and pressure detection ports (P1, P2) are arranged on the collection chamber cylinder. The test section connecting flange is connected to the test section inlet (outlet) flange. The hot air inlet flange is connected to the hot air heat source machine, and the hot air outlet flange is connected to the outlet flue.

[0007] The test section includes a test section cylinder, with both ends of the test section cylinder fixedly connected to the upper tube sheet and the lower tube sheet, respectively. A cold water heat exchange chamber is formed between the test section cylinder, the upper tube sheet, and the lower tube sheet. The test section cylinder is connected to an atmospheric venting device, and the upper and lower connecting flanges are connected to the upper and lower hot air collection sections, respectively. The test section cylinder is equipped with a temperature detection port and a drain port.

[0008] The test section includes a test element smoke tube. The smoke tube has tapered external pipe threads machined at both ends. The round tube is inserted into the test section cylinder and the two ends are screwed and fixed to the smoke tube fixing flange with tapered internal pipe threads. The upper and lower smoke tube fixing flanges are respectively fixed to the upper and lower pipe seat flanges with bolts.

[0009] The atmospheric ventilation device includes an expansion chamber and a bend. One end of the atmospheric ventilation device is connected to the test section cylinder, and the other end is open to the atmosphere. A perforated plate is provided in the upper middle part of the expansion chamber.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] This invention relates to an integrated testing device for enhancing the heat transfer and flow resistance performance of flue gas pipes. Its vertical, atmospheric-ventilated design avoids pressure on the test section, allowing for natural water circulation within the test section, resulting in a more uniform temperature field, higher testing accuracy, and reduced safety risks. Multi-point temperature and pressure monitoring enables simultaneous measurement of heat transfer and flow resistance performance. The threaded connection between the tested element and the test section facilitates easy replacement of different test elements, reducing testing costs and time. The atmospheric pressure volumetric testing system maintains a boiling water temperature, ensuring constant temperature. Adjusting the air intake parameters simulates different operating conditions, leading to more accurate performance test results. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 Cross-sectional view of the testing device.

[0014] Figure 2 Cross-sectional view of the test section and enlarged view of the smoke pipe and flange threaded connection.

[0015] Figure 3 Schematic diagram of an atmospheric ventilation device.

[0016] In the diagram: 1-Atmospheric venting device; 101-Expansion chamber; 102-Perforated plate; 103-Bend; 2-Hot air outlet section; 3-Test section; 301-Upper connecting flange; 302-Upper tube sheet; 303-Smoke tube; 304-Upper smoke tube fixing flange; 305-Upper tube seat; 306-Test section cylinder; 307-Lower tube seat; 308-Lower smoke tube fixing flange; 309-Lower tube sheet; 310-Lower connecting flange; 4-Hot air outlet section; 501-Pressure detection port P1; 502-Temperature detection port T1; 503-Water temperature detection port T0; 504-Pressure detection port P2; 505-Temperature detection port T2; 6-Drain outlet; 7-Water level gauge. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] like Figure 1-3 As shown, this utility model provides an integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas tube. This integrated testing device mainly consists of an atmospheric venting device 1, a hot air inlet collecting section 2, a testing section 3, a hot air outlet collecting section 4, and various sensors including a hot air inlet pressure P1 sensor 501, a hot air inlet temperature T1 sensor 502, a water temperature T0 sensor and a drain outlet 503, a hot air outlet pressure P2 sensor 504, a hot air temperature T2 sensor 505, a drain outlet 6, and a water level gauge 7. The testing section 3 is located at the core of the entire device, connected to the hot air inlet collecting section 1 and the hot air outlet collecting section 4 above and below, respectively. The atmospheric venting device 1 is connected to the testing section cylinder 306, and its key function is to ensure that the testing section 3 is always under normal pressure. This is crucial for simulating the normal pressure environment in actual operation and ensuring the accuracy and safety of the test. The water level gauge 7 is connected to both the test section cylinder 306 and the bend 202. This connection method allows for direct and accurate observation of the water level within the test section, ensuring that the water level never falls below the lower edge of the upper connecting flange 301 to maintain optimal heat exchange conditions within the test section. The drain outlet is located at the bottom of the test section cylinder 306. This design ensures that accumulated water in test section 3 can be completely drained after testing or when maintenance is required, preventing water accumulation from adversely affecting subsequent tests or equipment.

[0023] Internal structure of the test section: The upper end of the test section cylinder 306 is fixedly connected to the upper tube sheet 302 by welding or other reliable fixing methods, and the lower end is also fixedly connected to the lower tube sheet 309 to ensure the stability of the test section cylinder 306 structure. The upper tube sheet 302 is fixedly connected to the upper tube seat 305, and the lower tube sheet 309 is fixedly connected to the lower tube seat 307. A closed heat exchange chamber is formed between the upper tube seat 305, the test section cylinder 306, and the lower tube seat 307. The test section cylinder 306 is fixedly connected to the atmospheric venting device 1. When the water in the heat exchange chamber is heated to boiling, the atmospheric venting device 1 connects to the atmosphere, thereby ensuring that the heat exchange chamber is under normal pressure. The water level gauge 7 is connected to both the test section cylinder 306 and the bend 103. This design allows operators to easily observe the liquid level in the heat exchange chamber at any time, ensuring that the liquid level is within a suitable range and maintaining a stable heat exchange effect.

[0024] Installation structure of the tested component: The upper and lower ends of the tested component's flue tube 303 are fixed to the upper flue tube fixing flange 304 and the upper flue tube fixing flange 308 respectively using a sealing threaded connection. This fixing method ensures the sealing of the connection, preventing hot air leakage, and facilitates operation when the tested component's flue tube 303 needs to be replaced. The upper flue tube fixing flange 304 and the upper flue tube fixing flange 308 are fixedly connected to the upper tube seat 305 and the lower tube seat 307 respectively. When replacing the tested component's flue tube 303, the operator only needs to unscrew the threaded connections to the upper tube seat 305 and the lower tube seat 307 to easily and quickly remove the old tested component's flue tube 303 and replace it with the new tested component's flue tube 303, which greatly improves the efficiency of test component replacement and reduces testing costs and time.

[0025] Atmospheric Ventilation Device Structure: The atmospheric ventilation device 1 includes an expansion chamber 101, a perforated plate 102, and a bent pipe 103. The function of the bent pipe 103 is to connect with the atmosphere to ensure that the test section 3 is not pressurized. Its inner diameter Dn is determined according to the formula... The formula is as follows: Dn - inner diameter of the bend (mm); Q - heat exchange power (MW). Accurate calculation of the bend's inner diameter ensures the atmospheric venting device operates effectively under different heat exchange powers, guaranteeing the test section remains at atmospheric pressure. The perforated plate 102 has openings with diameters of 8-12mm. The number of openings is calculated based on a steam flow velocity of no more than 2m / s in the small holes. The perforated plate prevents steam from splashing out, ensuring operator safety and the stability of the test environment.

[0026] Working principle of the testing device: During use, 300℃ hot air generated by the hot air generator enters the 303 flue pipe through the hot air inlet collection section 1. As the hot air flows within the flue pipe, it transfers heat to the water in the testing section 3. With continuous heat transfer, the water is heated until it boils. An atmospheric venting device 1, connected to the testing section cylinder 306, ensures the testing section is at atmospheric pressure, at which point the external heat exchange conditions tend to stabilize. The temperature and pressure of the inlet and outlet sections are measured through the hot air inlet pressure detection port P1 501, the hot air inlet temperature detection port T1 502, the hot air outlet pressure detection port P2 504, and the hot air temperature detection port T2 505. Using relevant thermal calculation formulas, the heat exchange and flow resistance performance of the tested component can be accurately measured. This testing device adopts a vertical, atmospheric venting design. This design avoids pressure on the testing section, and the vertical arrangement allows for natural circulation of the water within the testing section, which is beneficial for a more uniform temperature field, thereby improving testing accuracy and reducing safety risks. Multi-point temperature and pressure monitoring allows for simultaneous measurement of heat transfer and flow resistance performance, yielding more comprehensive data. The tested component and test section utilize threaded connections, facilitating the replacement of different test components, reducing testing costs, and shortening testing time. Employing an atmospheric pressure volumetric testing system, the water temperature is maintained at a boiling state, ensuring constant temperature. Adjusting the intake parameters allows for the simulation of different operating conditions, resulting in more accurate performance test results that better reflect real-world application scenarios.

[0027] Accuracy of detection elements: The pressure sensors used at the hot air inlet pressure detection port P1 (501) and the hot air outlet pressure detection port P2 (504) have an accuracy of ±0.1% FS (full scale), enabling precise measurement of pressure changes at the inlet and outlet of hot air, providing reliable data for accurate calculation of flow resistance performance. The temperature sensors used at the hot air inlet temperature detection ports T1 (502) and T2 (505) have an accuracy of ±0.5℃, accurately measuring the temperature of hot air and ensuring the accuracy of temperature data when calculating heat transfer performance. The temperature sensor equipped at the water temperature detection port T0 also has an accuracy of ±0.5℃, accurately monitoring the water temperature within the test section.

[0028] Test section dimensions: The inner diameter of the test section cylinder 306 is customizable according to different testing requirements. Common specifications include 200mm, 300mm, and 400mm, with lengths generally between 1000mm and 3000mm. Specific dimensions can be adjusted based on the actual length of the flue pipe being tested and the required heat exchange space. The thickness of the upper tube sheet 302 and lower tube sheet 309 is calculated and determined based on the inner diameter of the test section cylinder 306 and the design pressure, generally between 5mm and 10mm, to ensure the tube sheets can withstand the pressure of hot air and water, while also ensuring the stability of the connection with the test section cylinder 306 and the tube seat.

[0029] Smoke tube parameters: Common outer diameter specifications for the smoke tube 303 of the tested component include 38mm, 51mm, and 60mm, with wall thickness generally between 2mm and 5mm. The length is adapted according to the length of the test section, typically between 800mm and 2800mm. The dimensions of the upper smoke tube fixing flange 304 and 308 match the outer diameter of the smoke tube 303, and their thickness is generally between 15mm and 20mm. The number and distribution of bolt holes are designed according to standard flanges to ensure a firm connection and a tight seal.

[0030] Parameters for the atmospheric venting device: The volume of the expansion chamber 101 is designed based on the maximum steam generation of the test section, generally 1 / 10 to 1 / 5 of the volume of the test section cylinder 306, to ensure a buffering effect and prevent sudden pressure changes when large amounts of steam are generated. The perforated plate 102 is made of stainless steel, with a thickness of 3mm to 5mm, to ensure corrosion resistance and structural strength in high-temperature steam environments. The elbow 103 is also made of stainless steel, and its length is rationally arranged according to the on-site installation space, but should ensure smooth communication with the atmosphere as much as possible to reduce unnecessary resistance.

[0031] Water level gauge parameters: Water level gauge 7 adopts a glass tube type water level gauge, and its tube diameter is generally 15mm to 25mm to facilitate clear observation of the water level. The length of water level gauge 7 should be sufficient to cover the normal range of water level changes within the test section cylinder 306, and shut-off valves should be installed at both ends of the water level gauge to facilitate shutting down the water level gauge during maintenance or repair to prevent water leakage.

[0032] Drainage port parameters: The diameter of drainage port 6 is generally 50mm to 80mm to ensure that the water accumulated in test section 3 can be drained quickly. Drainage port 6 should be equipped with a well-sealed drainage valve. The valve material should be water corrosion resistant, such as stainless steel or copper alloy, and the valve should be easy and quick to operate so that drainage can be carried out in a timely manner after the test.

[0033] Device Setup and Preparation: First, according to design requirements, precisely install the test section cylinder 306 with the upper tube sheet 302 and lower tube sheet 309, ensuring a firm connection and good sealing. Then, fix the upper tube seat 305 to the upper tube sheet 302, and the lower tube seat 307 to the lower tube sheet 309, forming a stable heat exchange chamber structure. Next, connect the tested element's flue tube 303 to the upper flue tube fixing flange 304 and upper flue tube fixing flange 308 via sealing threaded connections. Install the upper flue tube fixing flange 304 and upper flue tube fixing flange 308 onto the upper tube seat 305 and lower tube seat 307 respectively, ensuring the flue tube's verticality and sealing during installation. Afterward, install the atmospheric venting device 1, connecting and installing the expansion chamber 101, perforated plate 102, and elbow 103 according to design requirements, ensuring smooth communication between the elbow 103 and the atmosphere, and that the perforated plate 102 is firmly installed with openings meeting design requirements. Simultaneously, water level gauge 7 is installed, ensuring proper connection between it and the test section cylinder 306 and bend 202, enabling accurate water level display. Finally, the hot air inlet collection section 2 and hot air outlet collection section 4 are connected to the test section 3, and the following detection components are installed: hot air inlet pressure P1 detection port 501, hot air inlet temperature T1 detection port 502, water temperature T0 detection port and drain port 503, hot air outlet pressure P2 detection port 504, hot air temperature T2 detection port 505, and drain port 6. The installation positions of each detection component are ensured to be accurate and the connections reliable. After the device is assembled, a comprehensive inspection and debugging of the entire device is conducted to ensure correct connections of all components and the absence of leaks or other problems.

[0034] Test steps:

[0035] Initial status check: Before turning on the hot air generator, check again whether all connections of the test device are secure and whether all valves and measuring instruments are in normal working condition. In particular, confirm that the water level displayed by the water level gauge 7 is within the normal range, not lower than the lower edge of the upper connecting flange 301, and that the elbow 103 of the atmospheric vent device 1 is unobstructed and connected to the atmosphere.

[0036] Hot air introduction: Turn on the hot air generator and set its temperature to 300℃. Hot air gradually enters the flue pipe 303 of the component under test through the hot air inlet collection section 1. During the hot air introduction process, closely monitor the changes in the values ​​of the hot air inlet pressure detection port P1 501 and the hot air inlet temperature detection port T1 502 to ensure that the pressure and temperature of the hot air remain stable near the set values. At the same time, observe the changes in the state of the water in the test section 3 through the water level gauge 7 to ensure that there are no abnormal fluctuations or leaks in the water.

[0037] Heating and Stabilization Phase: As hot air continues to enter the flue pipe 303, heat is gradually transferred to the water in test section 3, and the water begins to heat up. During this process, the temperature change of the water temperature detection port T0 and the drain port 503 needs to be continuously monitored until the water is heated to boiling. After the water boils, it is maintained for a period of time to allow the heat exchange conditions outside the pipe to stabilize. Generally, the stabilization time should be no less than 15 minutes to ensure the accuracy and reliability of the test data. During the stabilization process, the operation of the atmospheric venting device 1 should be closely monitored to ensure that test section 3 is always under normal pressure. This can be determined by observing the flow of steam in the expansion chamber 101 of the atmospheric venting device 1 and whether the perforated plate 102 is working properly.

[0038] Data Acquisition: Once the external heat exchange conditions stabilize, simultaneously measure the temperature and pressure data at the inlet and outlet sections using the hot air inlet pressure sensor P1 (501), hot air inlet temperature sensor T1 (502), hot air outlet pressure sensor P2 (504), and hot air temperature sensor T2 (505). To improve data accuracy, the data acquisition frequency should be no less than once per second, with a continuous acquisition time of no less than 5 minutes, and each acquisition should be recorded. If abnormal fluctuations are detected during data acquisition, acquisition should be immediately paused, and the testing device should be checked for malfunctions or interference factors. After troubleshooting, data acquisition should be resumed.

[0039] Different operating conditions testing (optional step): If it is necessary to simulate different operating conditions to test the heat transfer and flow resistance performance of the tested component, the inlet parameters of the hot air generator, such as changing the flow rate and temperature of the hot air, can be adjusted, and the above-mentioned hot air introduction, heating and stabilization stages and data acquisition steps can be repeated. For tests under different operating conditions, data acquisition under each condition should be carried out independently, and the acquired data should be clearly marked for subsequent comparative analysis.

[0040] Replacement of the component under test (optional step): If it is necessary to replace the flue pipe 303 of the component under test for performance testing of different components, first turn off the hot air generator and stop the hot air supply. After the temperature and pressure in test section 3 have dropped to a safe range, unscrew the threads of the upper flue pipe fixing flange 304, the upper flue pipe fixing flange 308, the upper pipe seat 305, and the lower pipe seat 307, and carefully remove the old flue pipe 303. Then, install the new flue pipe 303 of the component under test according to the above installation steps, ensuring that the installation is firm and the seal is good. After installation, conduct a new round of testing according to the initial state check, hot air introduction, and other steps.

[0041] Post-test processing: After the test, first shut down the hot air generator to stop the supply of hot air. Then, drain the accumulated water in test section 3 through drain port 6. After draining, clean and inspect the inside of the test section to check for scaling, damage, etc. Organize and analyze the collected temperature and pressure data, calculate the heat transfer and flow resistance performance parameters of the tested components using relevant formulas from thermal engineering principles, and compare and evaluate the test results of different tested components according to the test objectives and requirements, providing strong data support for optimizing the design and performance improvement of the heat transfer flue. Simultaneously, perform comprehensive maintenance and upkeep on the entire testing device, checking for loose connections and proper sealing of all components, and promptly replacing any worn or damaged parts to ensure the device can operate normally and stably during the next test.

[0042] The vertical, open-atmosphere design avoids pressure on the test section, allowing for natural water circulation, resulting in a more uniform temperature field, higher testing accuracy, and reduced safety risks. Multi-point temperature and pressure monitoring enables simultaneous measurement of heat transfer and flow resistance performance. The threaded connection between the tested element and the test section facilitates easy replacement of different elements, reducing testing costs and time. The atmospheric pressure volumetric testing system maintains a constant water temperature at boiling point, allowing for the simulation of different operating conditions by adjusting the air intake parameters, leading to more accurate performance test results.

[0043] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated testing device for enhancing the heat transfer and flow resistance performance of flue gas pipes, characterized in that, include: The device includes an atmospheric venting device (1), a hot air inlet collection section (2), a test section (3), a hot air outlet collection section (4), a hot air inlet pressure P1 detection port (501), a hot air inlet temperature T1 detection port (502), a water temperature T0 detection port, a drain outlet (503), a hot air outlet pressure P2 detection port (504), a hot air temperature T2 detection port (505), a drain outlet (6), and a water level gauge (7). The upper and lower ends of the flue pipe (303) are fixed to the upper flue pipe fixing flange (304) and the upper flue pipe fixing flange (308) respectively by a sealing threaded connection. The upper and middle parts of the expansion chamber (101) of the atmospheric venting device (1) are provided with a perforated plate (102).

2. The integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas pipe according to claim 1, characterized in that, The test device is arranged vertically, and from top to bottom are the atmospheric ventilation device (1), the hot air inlet collection section (2), the test section (3), and the hot air outlet collection section (4). The heat exchange medium water in the vertically arranged test section (3) can achieve natural circulation.

3. The integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas pipe according to claim 1, characterized in that, The testing device is equipped with, from bottom to top, a hot air inlet temperature T1 detection port (502), a water temperature T0 detection port and a drain port (503), a hot air outlet pressure P2 detection port (504), and a hot air temperature T2 detection port (505).

4. The integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas pipe according to claim 1, characterized in that, The upper and lower ends of the flue (303) are fixed to the upper flue fixing flange (304) and the upper flue fixing flange (308) respectively by sealing threaded connection. The upper flue fixing flange (304) and the upper flue fixing flange (308) are fixedly connected to the upper pipe seat (305) and the lower pipe seat (307) respectively.

5. The integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas pipe according to claim 1, characterized in that, The atmospheric ventilation device (1) is equipped with an expansion chamber (101) to absorb the expansion of water in the test section (3) caused by heating; a perforated plate (102) is provided in the upper middle part of the expansion chamber (101).

6. The integrated testing device for enhancing the heat transfer and flow resistance performance of a flue gas pipe according to claim 1, characterized in that, The water level gauge (6) is set between the bend (103) and the expansion chamber (101). The lower edge of the water level gauge (6) is higher than the upper connecting flange (301) of the test section (3), and the upper edge of the water level gauge is lower than the perforated plate (102).

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