Boiler flue gas simulation test platform

Abstract

The utility model relates to a boiler flue gas simulation test platform, which comprises a gas distribution unit and a power unit which are respectively communicated with an inner cavity of a gas flow pipeline, and a standard detector assembly and a detection port assembly which are arranged on the gas flow pipeline, the gas distribution unit introduces at least two standard gases with different components into the gas flow pipeline to form target flue gas, the power unit drives the target flue gas to flow in an inner cavity of the gas flow pipeline, and the standard detector assembly comprises at least two standard detectors and is used for correspondingly detecting the content of each standard gas introduced into the gas flow pipeline. The detection port assembly comprises at least one first detection port communicated with the inner cavity of the airflow pipeline, and a boiler flue gas detection instrument to be detected is inserted into the first detection port, so that the first detection port and the standard detector assembly can detect the content of each standard gas in the target flue gas at the same time. And the flue gas detector is calibrated under the working condition, so that the detection accuracy of the calibrated boiler flue gas detector is improved.

Description

Technical Field

[0001] This utility model relates to the field of boiler flue gas simulation technology, and in particular to a boiler flue gas simulation test platform. Background Technology

[0002] Boilers, as high-energy-consuming special equipment in the industrial sector, have always been a focus of attention due to their energy consumption and emissions. Accurately measuring boiler energy consumption and air pollutant emissions is crucial for further improving energy conservation and emission reduction efforts. Currently, the most commonly used instrument for testing boiler energy efficiency and air pollutant (including carbon dioxide) emissions is the flue gas analyzer. This analyzer has multiple sensors to detect the content of different gaseous components in the flue gas, including O2, CO2, SO2, CO, and NO. To ensure the accuracy of various indicators in boiler flue gas emissions, the flue gas analyzer needs to be calibrated regularly.

[0003] The standard gas method is the most commonly used method for calibrating flue gas analyzers. The testing method involves, for example, using the analyzer to test a standard 5% O2 concentration and checking if the detected O2 content is 5%; then using the analyzer to test a standard 10% CO2 concentration and checking if the detected CO2 content is 10%. If the test results are inconsistent with the standard values, the calculation coefficients of each sensor in the instrument are adjusted until the test results match the standard values.

[0004] However, the calibration effect of the above-mentioned calibration measures is often limited. In actual testing, it is common for the data obtained by the calibrated flue gas analyzer to deviate significantly from the actual data under the on-site testing conditions. Sometimes, even when multiple calibrated flue gas analyzers are placed together in the same location in the tail flue of the boiler for testing, there will be significant differences in the flue gas parameters measured separately. Utility Model Content

[0005] Based on this, the purpose of this utility model is to overcome the defects or deficiencies of the prior art and provide a boiler flue gas simulation test platform, which can simulate the actual situation of flue gas generated in the tail flue of a boiler, and calibrate the boiler flue gas detection instrument based on the test results under this working condition, thereby improving the detection accuracy of the calibrated boiler flue gas detection instrument.

[0006] A boiler flue gas simulation test platform includes a gas distribution unit and a power unit respectively connected to the inner cavity of a gas flow duct, as well as a standard detector assembly and a detection port assembly disposed on the gas flow duct. The gas distribution unit introduces at least two standard gases of different compositions into the gas flow duct to form target flue gas. The power unit drives the target flue gas to flow in the inner cavity of the gas flow duct. The standard detector assembly includes at least two standard detectors for correspondingly detecting the content of each standard gas introduced into the gas flow duct. The detection port assembly includes at least one first detection port connected to the inner cavity of the gas flow duct. The first detection port is for the insertion of a boiler flue gas detection instrument to be tested, so as to simultaneously detect the content of each standard gas in the target flue gas with the standard detector assembly.

[0007] Compared with existing technologies, the boiler flue gas simulation test platform of this utility model simulates the gas composition in actual testing conditions by forming a mixed flue gas composed of various different gas components in a closed pipe. Then, the test results of the standard detector assembly and the boiler flue gas detection instrument under test are compared simultaneously on the same mixed flue gas. Based on the comparison results, the detection device under test is calibrated, thereby improving the detection accuracy of the calibrated boiler flue gas detection instrument.

[0008] In one embodiment, the detection port assembly further includes a second detection port for insertion of a standard boiler flue gas detection instrument, the second detection port being located at the same cross-section as the first detection port in the airflow duct.

[0009] In one embodiment, the gas distribution unit includes at least two gas passages, each of which introduces a different standard gas into the inner cavity of the gas passage.

[0010] In one embodiment, the boiler flue gas simulation test platform further includes a temperature control unit, which is located upstream of the gas flow duct relative to the detection port assembly along the gas flow direction, and is used to heat the target flue gas.

[0011] In one embodiment, the temperature regulating unit includes a heating element that is wrapped around the outer wall of the airflow duct.

[0012] In one embodiment, the boiler flue gas simulation test platform further includes a humidity adjustment unit, which is located upstream of the detection port assembly along the airflow direction in the airflow duct and is connected to the airflow duct. The humidity adjustment unit is used to introduce water vapor into the inner cavity of the airflow duct to adjust the humidity of the target flue gas.

[0013] In one embodiment, the boiler flue gas simulation test platform further includes a gas pressure regulating unit, which includes a regulating valve disposed on the gas flow pipeline for regulating the gas pressure within the gas flow pipeline.

[0014] In one embodiment, the airflow duct is in the shape of a loop connected end to end, forming a circulating airflow channel.

[0015] In one embodiment, the airflow duct between the gas distribution unit and the detection port assembly includes at least one corner section, and a flow stabilizing structure is provided in the corner section. The flow stabilizing structure includes a guide plate, and the extension direction of the guide plate is the same as the extension direction of the corner section.

[0016] In one embodiment, the flow stabilization structure further includes a honeycomb unit disposed upstream and / or downstream of the guide plate along the airflow direction within the airflow duct, the cross-section of the honeycomb unit being perpendicular to the airflow direction.

[0017] In one embodiment, the flow stabilization structure further includes a damping mesh disposed upstream and / or downstream of the guide plate along the airflow direction within the airflow duct, and located between the guide plate and the cell, wherein the cross-section of the damping mesh is perpendicular to the airflow direction.

[0018] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the boiler flue gas simulation test platform of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the boiler flue gas simulation test platform of this utility model installed inside the cabinet;

[0021] Figure label:

[0022] 1. Boiler flue gas simulation test platform; 2. Cabinet;

[0023] 10. Airflow duct; 101. First horizontal section; 102. Second horizontal section; 121. First vertical section; 122. Second vertical section; 141. First corner section; 142. Second corner section; 143. Third corner section;

[0024] 20. Gas distribution unit;

[0025] 30. Power unit;

[0026] 40. Detection port assembly; 401. First detection port; 402. Second detection port;

[0027] 50. Flow stabilizing structure; 500. Flow guide plate; 502. Honeycomb structure; 504. Damping mesh;

[0028] 60. Temperature control unit;

[0029] 70. Humidity control unit;

[0030] 80. Air pressure regulating unit;

[0031] 90. Integrated control unit. Detailed Implementation

[0032] Before using a flue gas analyzer to test boiler flue gas, it is usually calibrated using a standard gas method to ensure accuracy. However, in actual testing, when a flue gas analyzer calibrated using the standard gas method is used to test the flue gas in the boiler's tail flue, the test results deviate significantly from the actual situation. Sometimes, even when multiple calibrated flue gas analyzers are used to test the same flue gas at the same location in the boiler's tail flue, the test results can vary considerably.

[0033] After research and analysis, the inventors discovered that in actual testing conditions, flue gas is a mixture of various emitted gases. The presence of different gas components can interfere with the detection of a single gas content by the flue gas analyzer. Traditional standard gas calibration involves testing each standard gas individually with the flue gas analyzer. In other words, the gas environment used in the standard gas method is different from the gas environment in the actual testing conditions. Therefore, under field testing conditions, flue gas analyzers calibrated using the standard gas method are easily interfered with by the presence of other gas components when detecting a single gas component in a complex mixed gas environment, resulting in a significant deviation between the obtained test results and the actual situation.

[0034] Based on this, the boiler flue gas simulation test platform of this utility model simulates the gas composition under actual testing conditions by forming a mixed flue gas composed of various different gases in a closed pipe. Then, the detection results of the standard detector assembly and the flue gas detection instrument of the boiler under test are compared simultaneously on the same flue gas. Based on the comparison results, the flue gas detection instrument of the boiler under test is calibrated, thereby improving the detection accuracy of the calibrated flue gas detection instrument. Furthermore, by adjusting the temperature, humidity, and gas pressure in the closed pipe, the high temperature and humidity environment and gas pressure conditions of the actual testing conditions are simulated, further restoring the actual testing conditions. This allows the instrument to more accurately reflect the actual differences between the flue gas detection instrument of the boiler under test and the standard flue gas detection instrument. Based on the comparison results, the flue gas detection instrument of the boiler under test is calibrated, thereby further improving the detection accuracy of the calibrated flue gas detection instrument.

[0035] The present invention will now be described in detail with reference to the accompanying drawings.

[0036] Figure 1 The specific structure of one embodiment of the boiler flue gas simulation test platform of this utility model is shown. For example... Figure 1 As shown, in this embodiment, the boiler flue gas simulation test platform 1 includes an airflow duct 10, a power unit 30 and a gas distribution unit 20 respectively connected to the airflow duct 10, and a standard detector assembly (not shown) and a detection port assembly 40 installed on the airflow duct 10.

[0037] Specifically, the airflow duct 10 is generally rectangular, with its internal cavity forming a continuous circulation channel. The airflow duct 10 includes a first horizontal section 101 and a second horizontal section 102, a first vertical section 121 and a second vertical section 122, and four corner sections respectively connected to the horizontal and vertical sections. The corner section connecting the first vertical section 121 and the first horizontal section 101 is the first corner section 141; the corner section connecting the first horizontal section 101 and the second vertical section 122 is the second corner section 142; and the corner section connecting the second horizontal section 102 and the first vertical section 121 is the third corner section 143. The gas distribution unit 20 is connected to the second horizontal section 102. The gas distribution unit 20 specifically includes six air inlets or channels extending into the internal cavity of the airflow duct 10, used to respectively introduce N2, O2, CO2, CO, SO2, and NO into the internal cavity of the airflow duct 10. By controlling the amount of each gas introduced, the proportions of the components in the target flue gas can be adjusted to form different target flue gases to meet different detection needs.

[0038] The power unit 30 is located on the third corner section 143. The power unit 30 is specifically a fan. The rotation of the fan provides power for the gas flow in the airflow duct 10. The flow rate of the gas in the airflow duct 10 is adjusted by controlling the output power of the fan.

[0039] The standard detector assembly (not shown) includes six detectors, specifically sensors, with known accuracy for measuring the levels of N2, O2, CO2, CO, SO2, and NO.

[0040] The detection port assembly 40 includes at least one first detection port 401 communicating with the inner cavity of the airflow duct 10, which can be used to insert a boiler flue gas detection instrument under test. In this embodiment, there are a total of five first detection ports 401, used to simultaneously calibrate five boiler flue gas detection instruments under test. The number of first detection ports 401 can also be adjusted according to actual needs. Preferably, the first detection ports 401 and each standard detector in the standard detector assembly are located on the same cross-section of the airflow duct 10 to ensure that the airflow flowing through the boiler flue gas detection instrument under test is exactly the same as the airflow flowing through the standard detector assembly.

[0041] In use, the gas distribution unit 20 introduces N2, O2, CO2, CO, SO2 and NO into the inner cavity of the gas flow duct 10, which mix to form the target flue gas. The power unit 30 drives the target flue gas to circulate in the gas flow duct 10 until the gas flow rate in the duct reaches the set value. Then, the target flue gas is connected to the boiler flue gas detection instrument with a certain accuracy through the first detection port 401. The target flue gas in the duct is detected simultaneously by the boiler flue gas detection instrument and the standard detector assembly. Then, the detection results of the boiler flue gas detection instrument are compared with the detection results of the standard detector assembly, and the sensors in the boiler flue gas detection instrument used to detect N2, O2, CO2, CO, SO2 and NO are calibrated according to the comparison results.

[0042] Before detecting the target gas, the flue gas detector for the boiler under test can be calibrated in an air environment. Air is a relatively stable gas, primarily composed of 79% N2 and 21% O2, making air calibration both easy and relatively reliable. The specific process is as follows: first, air is introduced into the inner cavity of the airflow duct 10 as a background gas. The power unit 30 is activated to bring the gas flow rate within the airflow duct 10 to the set value. Then, the flue gas detector is connected, and the values ​​detected by the standard detection component are compared with those detected by the flue gas detector. Based on the difference between the two results, the sensor in the flue gas detector used for air detection is adjusted. Alternatively, pure nitrogen can be introduced as a background gas for calibration.

[0043] Besides calibrating the boiler flue gas detector by comparing the detection results between the standard detector assembly built into the simulation test platform and the detector of the boiler flue gas under test, calibration can also be performed by comparing the boiler flue gas detector of the boiler under test with a standard boiler flue gas detector of known accuracy. Therefore, in some embodiments, the detection port assembly 40 of the boiler flue gas simulation test platform also includes a second detection port 402 communicating with the inner cavity of the airflow duct 10, which can be used to insert a standard boiler flue gas detector of known accuracy. Preferably, the first detection port 401 and the second detection port 402 are located on the same cross-section of the airflow duct 10 to ensure that the airflow through the first detection port 401 and the second detection port 402 is in exactly the same state.

[0044] The simulation test platform 1 in the above embodiment simulates the gas composition in actual testing conditions by forming a target flue gas composed of various different gas components in a closed environment. Then, the detection results of the flue gas detection instrument of the boiler under test and the standard boiler flue gas detection instrument are compared while detecting the same target flue gas. Based on the comparison results, the flue gas detection instrument of the boiler under test is calibrated. This ensures the accuracy of calibration and improves the detection accuracy of the calibrated flue gas detection instrument.

[0045] In the simulation test platform 1 of the above embodiment, the design of the annular airflow pipes 10 connected end to end allows the generated target flue gas or background gas to circulate within a closed space. This closed environment helps the airflow stabilize. Testing is then performed only after the airflow reaches a stable value, reducing interference, improving detection accuracy, and thus facilitating calibration. Simultaneously, the annular design allows the simulation test platform 1 to be installed vertically within a cabinet 2 (e.g., Figure 2 As shown in the figure, it saves space. Furthermore, in addition to rectangles, the airflow duct 10 can also be circular, triangular, or polygonal. Since the circular airflow duct 10 has no corner sections, the airflow inside the duct is more likely to reach a stable state, but the circular airflow duct 10 occupies a larger area and is relatively more difficult to manufacture; the triangular airflow duct has larger corner angles, which can easily cause airflow instability; the polygonal airflow duct has more corner sections, which can also cause airflow instability inside the duct. Therefore, rectangular or square airflow ducts 10 are more advantageous.

[0046] Of course, the airflow duct 10 can also be designed to be unconnected at both ends, but such a structure means that a longer duct and a larger footprint are required to make the airflow entering the duct reach a stable state. If the airflow cannot reach a stable state, the test results will differ significantly from the actual situation.

[0047] In the simulation test platform 1 of the above embodiment, the target flue gas needs to pass through the first corner section 141 and the second corner section 142 before reaching the detection port assembly 40. Due to the inertia of the airflow, the target flue gas will form vortices or eddies as it flows through the corner sections, resulting in uneven airflow distribution in the corner sections, which in turn affects the detection results of the boiler flue gas detection instruments at the first and second detection ports. In order to stabilize the airflow state through the first detection port 401 and the standard detector assembly (or the second detection port 402), the first corner section 141 and the second corner section 142 are respectively provided with flow stabilizing structures 50.

[0048] Specifically, the flow stabilizing structure 50 includes multiple parallel guide plates 500, the extension direction of which matches the bending direction of the pipe wall at the bend. For example... Figure 1As shown, the guide plate 500 in the first corner section 141 and the guide plate 500 in the second corner section 142 are both L-shaped and adapted to the inner wall of the pipe at their respective locations. The guide plate 500 guides the airflow direction, allowing the airflow through the corner section to pass more smoothly, controlling the gas velocity, and dispersing the airflow for a more uniform distribution. Alternatively, a flow stabilizing structure 50 can be installed in only one corner section. If only one flow stabilizing structure 50 is installed, it is preferable to install it in the second corner section 142. However, compared to installing only one flow stabilizing structure 50, installing flow stabilizing structures 50 in both corner sections is more effective in improving the uniformity of airflow distribution.

[0049] Furthermore, the flow stabilization structure 50 also includes a honeycomb unit 502, which is installed on the inner wall of the pipe at the inlet and outlet ends of each corner section. The honeycomb unit 502 at the inlet end is located upstream of the guide plate 500 along the airflow direction, and the honeycomb unit 502 at the outlet end is located downstream of the guide plate 500 along the airflow direction. The cross-section of each honeycomb unit 502 is perpendicular to the airflow direction. By setting the honeycomb unit 502, the turbulence formed at the inlet and outlet ends of the corner section can be cut off, reducing the degree of airflow turbulence, improving the stability and uniformity of the airflow, and further stabilizing the state of the target flue gas flowing through the first detection port 401 and the standard detector assembly (or the second detection port 402), thereby improving the accuracy of instrument detection.

[0050] In some embodiments, the flow stabilization structure 50 further includes a damping mesh 504, which is installed on the inner wall of the pipe at the inlet and outlet ends of each corner section, and located between the honeycomb unit 502 and the guide plate 500, with the cross-section of the damping mesh 504 perpendicular to the airflow direction. The damping mesh 504, in conjunction with the honeycomb unit 502, can reduce the degree of airflow turbulence and improve the non-uniformity of airflow.

[0051] Since the flue gas at the tail end of a boiler is typically in a high-temperature and high-humidity environment, to further simulate the temperature and humidity conditions of the boiler tail flue, in some embodiments, the boiler flue gas simulation test platform also includes a temperature regulation unit 60 and a humidity regulation unit 70. The temperature regulation unit 60 is specifically a heating coil, which is arranged around the outer wall of the first vertical section 121 of the airflow duct 10 to heat the gas inside the airflow duct 10. Of course, the temperature regulation unit 60 can also be arranged on the first horizontal section 101 in addition to the first vertical section 121. The humidity regulation unit 70 is a steam generator connected to the airflow duct 10, used to introduce steam into the inner cavity of the airflow duct 10 to regulate the humidity of the gas inside the duct. Of course, the humidity control unit 70 can also be set on the first horizontal section 101, but it is preferred to set it on the first vertical section 121. In this way, the water vapor and the target flue gas are mixed evenly by the flow stabilizing structure 50 in the first corner section 141 and the second corner section 142, so that the target flue gas that finally reaches the first detection port 401 and the standard detector assembly (or the second detection port 402) is closer to the flue gas actually generated in the boiler tail flue. In this way, the temperature and humidity of the gas in the pipeline are regulated by the temperature control unit 60 and the humidity control unit 70 to simulate the temperature and humidity conditions of the boiler tail flue, so as to further improve the accuracy of the instrument detection.

[0052] Furthermore, to simulate the gas pressure environment of the boiler tail flue, in some embodiments, the boiler flue gas simulation test platform also includes a gas pressure regulating unit 80 connected to the gas flow pipe 10. The gas pressure regulating unit 80 includes a regulating valve to regulate the gas pressure within the pipe. The gas pressure regulating unit 80 also includes a vacuum pump connected to the gas flow pipe 10 for evacuating the inner cavity of the pipe, thus creating a vacuum state within the pipe. In this way, by regulating the gas pressure within the pipe, the gas pressure conditions of the boiler tail flue are simulated, further improving the accuracy of instrument detection.

[0053] To achieve full automation of the calibration process, the aforementioned boiler flue gas simulation test platform 1 also includes a comprehensive control unit 90. The comprehensive control unit 90 includes gas composition sensors, temperature and humidity sensors, wind speed sensors, and air pressure sensors, control units electrically connected to these sensors, and display screens electrically connected to each sensor and control unit. The control unit is also electrically connected to the gas distribution unit 20, power unit 30, temperature regulation unit 60, humidity regulation unit 70, and air pressure regulation unit 80. The comprehensive control unit 90 is located on the second vertical section 122 of the airflow duct 10, upstream of the standard detector assembly and detection port assembly 40 along the airflow direction. It collects various data from the airflow duct 10 through the sensors and displays them on the display screen. After calculating and analyzing the collected data, the control unit adjusts the outputs of the gas distribution unit 20, power unit 30, temperature regulation unit 60, humidity regulation unit 70, and air pressure regulation unit 80, thereby achieving the display, calculation, and control regulation of various components in the target flue gas, as well as the temperature, humidity, flow rate, and air pressure within the duct.

[0054] Compared to existing technologies, this utility model's boiler flue gas simulation test platform simulates the gas composition under actual testing conditions by creating a mixed flue gas composed of various gases within a sealed pipeline. It then compares the detection results of a standard boiler flue gas analyzer and the analyzer under test simultaneously on the same flue gas. Based on the comparison results, the analyzer under test is calibrated, thereby improving the detection accuracy of the calibrated analyzer. Furthermore, by heating, humidifying, and adjusting the gas pressure within the sealed pipeline, the high-temperature and high-humidity environment and pressure conditions of actual testing conditions are simulated, further reproducing the actual testing conditions to more realistically reflect the actual differences between the analyzer under test and the standard analyzer. Based on this comparison result, the analyzer under test is calibrated, further improving the detection accuracy of the calibrated analyzer.

[0055] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” means two or more; the terms “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A boiler flue gas simulation test platform, characterized in that: It includes an air distribution unit (20) and a power unit (30) that are respectively connected to the inner cavity of the airflow duct (10), as well as a standard detector assembly and a detection port assembly (40) installed on the airflow duct (10); The gas distribution unit (20) introduces at least two standard gases of different compositions into the gas flow duct (10) to form target flue gas. The power unit (30) drives the target flue gas to flow in the inner cavity of the gas flow duct (10). The standard detector assembly includes at least two standard detectors for correspondingly detecting the content of each standard gas introduced into the gas flow duct (10). The detection port assembly includes at least one first detection port (401) communicating with the inner cavity of the gas flow duct (10). The first detection port (401) is for the boiler flue gas detection instrument to be tested to be inserted so as to simultaneously detect the content of each standard gas in the target flue gas with the standard detector assembly.

2. The boiler flue gas simulation test platform according to claim 1, characterized in that: The detection port assembly (40) further includes a second detection port (402) for inserting a standard boiler flue gas detection instrument. The second detection port and the first detection port (401) are located at the same cross-section of the airflow duct (10).

3. The boiler flue gas simulation test platform according to claim 1, characterized in that: The gas distribution unit (20) includes at least two ventilation pipes, which respectively introduce different standard gases into the inner cavity of the gas flow pipe (10).

4. The boiler flue gas simulation test platform according to claim 1, characterized in that: It also includes a temperature regulating unit (60), which is located upstream of the airflow duct (10) relative to the detection port assembly (40) in the airflow direction, for heating the target flue gas.

5. The boiler flue gas simulation test platform according to claim 1, characterized in that: It also includes a humidity adjustment unit (70), which is located upstream of the detection port assembly (40) in the airflow direction of the airflow duct (10) and is connected to the airflow duct (10) for introducing water vapor into the inner cavity of the airflow duct (10) to adjust the humidity of the target flue gas.

6. The boiler flue gas simulation test platform according to claim 1, characterized in that: It also includes a pressure regulating unit (80), which includes a regulating valve disposed on the airflow pipe (10) for regulating the gas pressure in the airflow pipe (10).

7. The boiler flue gas simulation test platform according to any one of claims 1 to 6, characterized in that: The airflow duct (10) is in the shape of a ring with the ends connected, forming a circulating airflow channel.

8. The boiler flue gas simulation test platform according to claim 7, characterized in that: The airflow duct (10) between the gas distribution unit (20) and the detection port assembly (40) includes at least one corner section, and a flow stabilizing structure (50) is provided in the corner section. The flow stabilizing structure includes a guide plate (500), and the extension direction of the guide plate (500) is the same as the extension direction of the corner section.

9. The boiler flue gas simulation test platform according to claim 8, characterized in that: The flow stabilization structure (50) further includes a honeycomb unit (502), which is disposed upstream and / or downstream of the flow guide plate (500) along the airflow direction in the airflow duct (10), and the cross-section of the honeycomb unit (502) is perpendicular to the airflow direction.

10. The boiler flue gas simulation test platform according to claim 9, characterized in that: The flow stabilization structure (50) further includes a damping mesh (504), which is disposed upstream and / or downstream of the guide plate (500) along the airflow direction in the airflow duct (10) and located between the guide plate (500) and the honeycomb unit (502). The cross-section of the damping mesh (504) is perpendicular to the airflow direction.

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