Flue gas measuring device for on-line metering calibration

Abstract

The embodiment of the utility model provides a flue gas measuring device for on-line metering calibration, and belongs to the field of flue gas testing. A flue gas measuring device for on-line metering calibration is used for measuring flue gas in a flue to be detected, the flue gas measuring device comprises an MCU chip, a metering platform and an ultrasonic transducer measuring unit, the ultrasonic transducer measuring unit is arranged in the flue to be detected and connected with the MCU chip, the MCU chip is connected with the metering platform, and the metering platform is connected with the ultrasonic transducer measuring unit. The MCU chip is in communication connection with the metering platform; wherein the ultrasonic transducer measuring unit can flow in the flue to be detected. The flue gas measuring device completes online metering calibration of flue gas flow and flow velocity of the flue to be detected. And as the flue gas measuring device detects the flue gas flow velocity of a plurality of measuring points in the to-be-detected flue, the flue gas flow and flow velocity can be accurately sampled and measured for non-uniform flow field flues, high-flow flues and large-section flues.

Description

Technical Field

[0001] The utility model relates to the field of smoke testing, in particular to an online metrologically calibrated smoke measuring device. Background Art

[0002] Responding to climate change is a hot topic and focus of ecological civilization construction. Monitoring and measuring carbon emissions are the basis and key to carbon emissions trading and control, achieving carbon neutrality and carbon peak tasks, and responding to climate change. In 2021, China launched a carbon emissions trading market, and "carbon assets" were officially given market value and liquidity. At present, the thermal power industry as a whole has entered the carbon market; large fixed sources of carbon emissions such as steel, electrolytic aluminum, and cement will enter the carbon market one after another. Among them, flue gas flow is one of the key factors affecting the accuracy of carbon monitoring, and accurate measurement of carbon emissions is a prerequisite for achieving fair trading of "carbon assets". Therefore, the realization of online measurement and calibration of large-flow flue gas measurement devices is of great significance to improving the quality of carbon emission data.

[0003] At present, for large-section flues, such as the tail wind flues of thermal power plants, the flow field distribution of the wind flues is uneven due to space limitations and changes in the lining structure after the ultra-low emission transformation. Especially for tests with higher flow measurement requirements, there are common problems such as uneven flow field velocity, short straight pipe sections of the wind flues, and insufficient representativeness of test points. Therefore, in wind flues with uneven flow fields, the flue gas data measured by single-point sampling has large errors and cannot represent the actual parameters of the flue gas, and cannot be used as a reference for carbon measurement. Therefore, how to develop a device that can be calibrated online and meets large-flow flue gas testing for flues with uneven flow fields, so as to accurately sample and measure the flue gas in flues with uneven flow fields is a problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide an online metrologically calibrated flue gas measuring device to solve the problem in the prior art of how to accurately sample and measure the flue gas in a flue with an uneven flow field.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides an online metrological and calibrated flue gas measuring device for measuring the flue gas to be detected, the flue gas measuring device comprises an MCU chip, a metering platform and an ultrasonic transducer measuring unit, the ultrasonic transducer measuring unit is arranged in the flue to be detected, the ultrasonic transducer measuring unit is connected to the MCU chip, and the MCU chip is communicatively connected to the metering platform; wherein the ultrasonic transducer measuring unit can circulate in the flue to be detected.

[0006] Optionally, an I2C communication interface is provided between the ultrasonic transducer measuring unit and the MCU chip.

[0007] Optionally, a NBIoT communication module is provided between the MCU chip and the metering platform.

[0008] Optionally, the ultrasonic transducer measuring unit is connected to a device supporting structure.

[0009] Optionally, a sampling hole is provided on the inner wall of the flue to be inspected, and one end of the equipment supporting structure passes through the sampling hole.

[0010] Optionally, a fixing flange is sleeved on the equipment supporting structure, and the fixing flange can pass through the sampling hole and be threadedly connected to the sampling hole.

[0011] Optionally, the size of the ultrasonic transducer measuring unit is not larger than the size of the sampling hole.

[0012] Optionally, the ultrasonic transducer measurement unit performs single-point detection and / or matrix multi-point detection during the flow process.

[0013] Optionally, a connecting cable is provided between the ultrasonic transducer measuring unit and the MCU chip.

[0014] Optionally, the above-mentioned online measurement and calibration flue gas measurement device also includes a standard flow measurement unit, and the above-mentioned standard flow measurement unit is connected to the above-mentioned MCU chip.

[0015] Optionally, the above-mentioned online measurement and calibration flue gas measurement device also includes a display terminal, and the above-mentioned display terminal is connected to the above-mentioned ultrasonic transducer measurement unit and the above-mentioned MCU chip at the same time.

[0016] Through the above technical scheme, an online metrologically calibrated flue gas measuring device is provided, which is used to measure the flue gas of the flue to be detected. The flue gas measuring device includes an MCU chip, a metering platform and an ultrasonic transducer measuring unit. The ultrasonic transducer measuring unit is arranged in the flue to be detected, and the ultrasonic transducer measuring unit is connected to the MCU chip, and the MCU chip is connected to the metering platform for communication; and the ultrasonic transducer measuring unit can flow in the flue to be detected. The online metrologically calibrated flue gas measuring device performs flow detection in the flue to be detected through the ultrasonic transducer measuring unit to detect the flue gas flow rate at multiple measuring points in the flue to be detected, and transmits the flue gas flow rate value of each measuring point to the MCU chip, and obtains the average flow rate and the flue gas flow rate value of the representative measuring point through the MCU chip, and then obtains the flue gas emission flow value of the entire cross-sectional area of ​​the flue to be detected. The flue gas emission flow value, the average flow rate and the flue gas flow rate value of the representative measuring point of the entire cross-sectional area of ​​the flue to be detected are uploaded to the metering platform through the MCU chip, completing the online metrological calibration of the flue gas flow rate and flow rate of the flue to be detected. Since the flue gas measuring device detects the flue gas flow rate at multiple measuring points in the flue to be detected, accurate sampling and measurement of the flue gas flow rate and flow rate can be achieved for flues with uneven flow fields, flues with large flow rates, and flues with large cross-sections.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of a flue gas measuring device for online measurement and calibration provided by one embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of another on-line measurement and calibration flue gas measuring device provided by one embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of another on-line measurement and calibration flue gas measuring device provided by an embodiment of the utility model.

[0022] Description of Reference Numerals

[0023] 1- flue to be inspected, 2- ultrasonic transducer measurement unit, 3- MCU chip, 4- metering platform, 5- I2C communication interface, 6- NBIoT communication module, 7- equipment support structure, 8- sampling hole, 9- fixing flange, 10- connecting cable, 11- display terminal. DETAILED DESCRIPTION

[0024] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0025] In the embodiments of the present invention, unless otherwise stated, the directional words such as "upper, lower, left, right" generally refer to the directional or positional relationship shown in the drawings, or the directional or positional relationship in which the product of the utility model is usually placed when in use. The terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0026] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0027] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] Please refer to Figure 1 , Figure 1 It is a schematic diagram of an online metrologically calibrated flue gas measuring device provided by an embodiment of the utility model. This embodiment provides an online metrologically calibrated flue gas measuring device, which is used to measure the flue gas of the flue 1 to be detected. The flue gas measuring device includes an MCU chip 3, a metering platform 4 and an ultrasonic transducer measuring unit 2. The ultrasonic transducer measuring unit 2 is arranged in the flue 1 to be detected, and the ultrasonic transducer measuring unit 2 is connected to the MCU chip 3, and the MCU chip 3 is communicatively connected to the metering platform 4; wherein the ultrasonic transducer measuring unit 2 can circulate in the flue 1 to be detected.

[0032] Specifically, the flue gas measurement device for online metrology calibration performs flow detection in the flue 1 to be detected through the ultrasonic transducer measurement unit 2 to detect the flue gas flow rate at multiple measurement points (such as point A, point B, point C and point D) in the flue 1 to be detected, and transmits the flue gas flow rate value of each measurement point to the MCU chip 3, and obtains the average flow rate and the flue gas flow rate value of the representative measurement point through the MCU chip 3, and then obtains the flue gas emission flow rate value of the cross-sectional area of ​​the entire flue 1 to be detected. The flue gas emission flow rate value, the average flow rate and the flue gas flow rate value of the representative measurement point of the cross-sectional area of ​​the entire flue 1 to be detected are uploaded to the metering platform 4 through the MCU chip 3, completing the online metrology calibration of the flue gas flow rate and flow rate of the flue 1 to be detected. Since the flue gas measurement device detects the flue gas flow rate at multiple measurement points in the flue 1 to be detected, accurate sampling and measurement of the flue gas flow rate and flow rate can be achieved for flues with uneven flow fields, flues with large flow rates and flues with large cross-sections.

[0033] In the above implementation process, the online measurement and calibration flue gas measurement device can accurately measure the flue gas flow rate in the flue gas with a flow velocity of 1m / s~30m / s and a moisture content of up to 10%~20%. At the same time, online measurement and calibration can be performed, which provides technical support for accurate testing of flue gas flow and provides technical support for flow measurement to reach the measurement level.

[0034] Among them, the ultrasonic transducer uses the fact that the propagation speed of sound waves in the fluid varies depending on the flow direction, and measures the upstream propagation time and downstream propagation time of sound waves in the fluid, thereby calculating the speed and flow rate of the fluid flow. The measuring unit of the ultrasonic transducer (i.e., the ultrasonic transducer measuring unit 2) independently having a transmitting end and a receiving end is extended into the measured point (i.e., the measuring point) of the flue 1 to be detected through the sampling hole 8 of the flue 1 to be detected, and different depths and positions are selected for single-point or matrix layout according to the distribution of the flue flow field. The accurate flow velocity value of the representative measuring point is obtained through the ultrasonic velocity measurement principle, and the flue gas emission flow value of the entire cross-sectional area of ​​the flue 1 to be detected is obtained by calculation.

[0035] It should be noted that the principle of ultrasonic velocity measurement is mainly based on the propagation characteristics of ultrasonic waves in the medium and the Doppler effect. Ultrasonic waves are a kind of wave with a frequency exceeding 2×10 4 The propagation speed of a sound wave of Hz in an elastic medium is related to the characteristics and state factors of the medium. By measuring the propagation speed of ultrasonic waves in a medium, we can understand the characteristics or state changes of the medium. The ultrasonic velocimeter uses this principle to measure the speed of an object through a combination of a transmitter and a receiver.

[0036] Exemplarily, the measurement range of the flue gas measuring device is: upper limit of the measurement range ≥ 30 m / s, zero flow reading ≤ 0.012 m / s, and minimum resolution is 0.05 m / s.

[0037] Please refer to Figure 2 , Figure 2 It is a schematic diagram of another on-line measurement and calibration smoke measuring device provided by an embodiment of the utility model. In some implementations of this embodiment, an I2C communication interface 5 is provided between the ultrasonic transducer measurement unit 2 and the MCU chip 3 .

[0038] In some implementations of this embodiment, a NBIoT communication module 6 is provided between the MCU chip 3 and the metering platform 4 .

[0039] Among them, the above-mentioned metering platform 4 can be a OneNet cloud platform.

[0040] Specifically, the ultrasonic transducer measurement unit 2 uploads environmental parameters (including flue gas flow velocity values ​​at each measurement point) to the STM32 MCU (i.e., MCU chip 3) through the I2C communication interface 5, and the MCU chip 3 uploads the result parameters (including the flue gas emission flow value, the average flow velocity, and the flue gas flow velocity value at representative measurement points of the entire cross-sectional area of ​​the flue 1 to be detected) to the OneNet cloud platform through the NBIoT communication module 6. Thus, the uploading of the flow signal is realized through the I2C communication interface 5, and the result parameters are uploaded to the metering platform 4 through the NBIoT communication module 6, realizing the uploading of the flow signal of the ultrasonic transducer measurement unit 2 for large-flow flue gas measurement and the online metering of the large-flow flue gas measurement results.

[0041] Among them, the above environmental parameters also include on-site smoke exhaust temperature, humidity and pressure data.

[0042] In some implementations of this embodiment, the ultrasonic transducer measuring unit 2 is connected to a device supporting structure 7. Specifically, the probe position of the ultrasonic transducer measuring unit 2 is adjusted by the device supporting structure 7, so that the ultrasonic transducer measuring unit 2 is moved to the sampling point to be measured (ie, the measuring point).

[0043] In detail, the specific implementation process of adjusting the probe position of the ultrasonic transducer measuring unit 2 through the equipment support structure 7 is as follows:

[0044] 1) Check the instrument (i.e. ultrasonic transducer measuring unit 2) to ensure that the portable ultrasonic flowmeter (i.e. ultrasonic transducer measuring unit 2) is in good condition, and calibrate the instrument to zero point to ensure that it meets the accuracy requirements of national metrological standards;

[0045] 2) Connect the instrument and extend the ultrasonic transducer sampling tube section (i.e., the equipment support structure 7) into the sampling hole 8, and adjust the angle by the direction indicator to ensure that the sampling tube section and the measured airflow direction remain horizontal;

[0046] 3) Adjust the probe position of the ultrasonic transducer measuring unit 2 through the equipment support structure 7 so that it is fixed at the sampling point to be measured, stabilize the instrument and lock the angle and direction, and read and record the flow velocity value of the measuring point through the display terminal 11;

[0047] 4) Use the same method as steps 1) to 3) to measure the flow rate value of each measuring point, record them one by one and combine them with the on-site smoke exhaust temperature, humidity and pressure data to obtain the single-point flow rate value and the flow rate average value through the data processing unit (i.e., MCU chip 3).

[0048] In some implementations of this embodiment, a sampling hole 8 is opened on the inner wall of the flue 1 to be detected, and one end of the equipment supporting structure 7 passes through the sampling hole 8 .

[0049] In some implementations of this embodiment, a fixing flange 9 is sleeved on the device support structure 7, and the fixing flange 9 can pass through the sampling hole 8 and be threadedly connected to the sampling hole 8. Specifically, when the ultrasonic transducer measurement unit 2 moves to the measurement point, the device support structure 7 is fixed by the fixing flange 9, so that the ultrasonic transducer measurement unit 2 is fixed to the measurement point, so that when the ultrasonic transducer measurement unit 2 performs smoke measurement, the user does not need to hold the device support structure 7 for a long time, thereby freeing the user's hands.

[0050] It should be noted that soft glue is coated on the outer surface thread of the fixing flange 9, so that on the basis of the soft glue, the fixing flange 9 and the sampling hole 8 thread cooperate, thereby fixing the equipment support structure 7 while also being able to fix the equipment support structure 7 when the equipment support structure 7 is in an inclined direction.

[0051] In some implementations of this embodiment, the size of the ultrasonic transducer measuring unit 2 is not greater than the size of the sampling hole 8 .

[0052] Specifically, the overall size of a single ultrasonic transducer measuring unit 2 is no larger than the sampling hole 8 reserved on the flue 1 to be detected, so that the sampling hole 8 of the existing flue 1 to be detected can be used to extend into the flue 1 to be detected at different depths to measure the flow rate, without the need to remodel the sampling hole 8 of the flue 1 to be detected.

[0053] In some implementations of this embodiment, the ultrasonic transducer measuring unit 2 performs single-point detection and / or matrix multi-point detection during the circulation process.

[0054] The single-point detection refers to the measurement of the flue gas velocity at one measurement point in the cross section of the flue 1 to be detected. The matrix multi-point detection refers to the measurement of the flue gas velocity at multiple measurement points in the cross section of the flue 1 to be detected.

[0055] Specifically, the flue gas measurement device for online metrology calibration proposes a matrix multi-point detection method suitable for flues with uneven flow fields, providing an accurate measurement solution for wind and flue gas sampling and analysis in thermal power plants. The matrix multi-point detection method is to divide the cross section of the wind and flue into several rectangular blocks of equal area, and the center of each rectangular block is the sampling point (i.e., the measurement point). Through the reasonable arrangement of multiple sampling points, the full-section wind and flue gas mixed sampling of the large-section wind and flue can be realized. The specific operation is: full-section matrix multi-point measurement is adopted on the cross section of the large wind and flue, and the number of matrix points (i.e., measurement points) is determined according to factors such as the size of the cross-section size and the length of the straight pipe section; the ultrasonic transducer measurement unit 2 is arranged on the corresponding matrix point according to the design plan; and the position of the ultrasonic transducer measurement unit 2 is adjusted by means of the equipment support structure 7 to move the ultrasonic transducer measurement unit 2 to different measurement points, so that the flue gas flow rate at different measurement points is organically assembled together, so that the average flue gas velocity of the cross section is measured during the actual measurement, and then the wind and smoke volume is calculated. The online flue gas measurement device can be used reliably for a long time, and avoids the defects of the existing technology (such as multi-point pitot tube) with more pressure sensors and bulky transmission pipelines. The online flue gas measurement device can perform combined measurement of large-flow flue gas at chimneys or flue sections of fixed pollution sources through matrix combination.

[0056] In some implementations of this embodiment, a connection cable 10 is provided between the ultrasonic transducer measuring unit 2 and the MCU chip 3 .

[0057] In some implementations of this embodiment, the above-mentioned connecting cable 10 can be wound around the equipment supporting structure 7, so as to effectively prevent the connecting cable 10 from being scattered everywhere while ensuring the transmission of the flow signal between the ultrasonic transducer measuring unit 2 and the MCU chip 3.

[0058] In some implementations of this embodiment, the above-mentioned online measurement and calibration flue gas measurement device further includes a standard flow measurement unit, and the above-mentioned standard flow measurement unit is connected to the above-mentioned MCU chip 3.

[0059] Specifically, during online metrological calibration, a standard flow measurement device with metrological certification (i.e., a standard flow measurement unit) is used to calibrate the flue gas measurement device at the same time, in the same area, and under the same operating conditions.

[0060] It should be noted that the use of standard flow measurement equipment with metrological proof (i.e., standard flow measurement unit) to calibrate the flue gas measuring device at the same time, in the same area and under the same working conditions is a metrological calibration behavior. This metrological calibration behavior is the transfer of measurement value. After a type of instrument is verified or calibrated (this application specifically refers to those "standard flow measurement equipment with metrological proof"), the standard value of this type of instrument is transferred to the measuring instrument through different levels of metrological standards. This is to allow the measurement value standards of the upper layer to be transferred to the lower layer (this application specifically refers to "flue gas measuring devices"). Simply put, it is a top-to-bottom transfer process. In the metrology industry, most of the verification work has the attribute of measurement value transfer. Any flue gas measuring device, in order to ensure its accuracy and traceability, must regularly use "standard flow measurement equipment with metrological proof to measure the flue gas and transfer the measurement value. This process is metrological calibration". Metrological calibration is a safeguard measure, it cannot replace daily measurement.

[0061] Exemplarily, the error of the flow velocity indication at each single point of the online measurement calibration does not exceed 1%, and the average error of the average flow velocity field of the entire cross section does not exceed 1.5%.

[0062] Please refer to Figure 3 , Figure 3 Schematic diagram of another online measurement and calibration smoke measuring device provided by an embodiment of the utility model. In some embodiments of this embodiment, the online measurement and calibration smoke measuring device further includes a display terminal 11, and the display terminal 11 is connected to the ultrasonic transducer measurement unit 2 and the MCU chip 3 at the same time.

[0063] The display terminal 11 mainly displays the instantaneous measurement values ​​of three parameters, namely, flow rate, temperature and pressure.

[0064] Example 2

[0065] This embodiment provides a flue gas measurement device for online metrology and calibration and an S-type pitot tube, which are respectively applied to a comparative experiment of power plant A for field testing and method verification.

[0066] The unit capacity of the A power plant is 300MW. The boiler is a ∏-type drum boiler with subcritical parameters, controlled cycle, four-corner tangential combustion, one intermediate reheat, single furnace balanced ventilation, solid slag discharge, open-air layout, and all-steel frame. The ash removal system is pneumatic ash removal. The test was carried out at the chimney inlet, where the flue gas temperature was 52°C and the flue gas dew point temperature was 110°C. The test results of equipment 1 and equipment 2 are shown in Table 1, where equipment 1 is an online metrologically calibrated flue gas measurement device provided by this application, and equipment 2 is a standard flow measurement device with metrological certification, namely, an S-type pitot tube:

[0067] Table 1 Test results of device 1 and device 2

[0068]

[0069] It can be seen from Table 1 that the online metrologically calibrated flue gas measuring device provided by the present application has good test repeatability, and the estimated standard deviation based on 6 samples under the same working conditions on site is 0.089 m / s; at the same time, a standard flow measurement device with metrological proof is used to compare the CMS data of the online metrologically calibrated flue gas measuring device provided by the present application under the same time area and working conditions, and the flow rate accuracy error is -0.36%.

[0070] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0072] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A flue gas measuring device for online metrology and calibration, characterized in that: Used to measure the flue gas of the flue to be detected, the flue gas measuring device includes an MCU chip, a metering platform and an ultrasonic transducer measuring unit, the ultrasonic transducer measuring unit is arranged in the flue to be detected, the ultrasonic transducer measuring unit is connected to the MCU chip, and the MCU chip is communicatively connected to the metering platform; wherein the ultrasonic transducer measuring unit can circulate in the flue to be detected.

2. The flue gas measuring device for online metrology and calibration according to claim 1, characterized in that: An I2C communication interface is provided between the ultrasonic transducer measuring unit and the MCU chip.

3. The flue gas measuring device for online metrology and calibration according to claim 1, characterized in that: A NBIoT communication module is provided between the MCU chip and the metering platform.

4. The on-line metrologically calibrated flue gas measuring device according to claim 1, characterized in that: The ultrasonic transducer measuring unit is connected to an equipment supporting structure.

5. The on-line metrologically calibrated flue gas measuring device according to claim 4, characterized in that: A sampling hole is provided on the inner wall of the flue to be detected, and one end of the equipment supporting structure passes through the sampling hole.

6. The flue gas measuring device for online metrology and calibration according to claim 5, characterized in that: A fixing flange is sleeved on the equipment supporting structure, and the fixing flange can pass through the sampling hole and be threadedly connected with the sampling hole.

7. The on-line metrologically calibrated flue gas measuring device according to claim 5, characterized in that: The size of the ultrasonic transducer measuring unit is not greater than the size of the sampling hole.

8. The flue gas measuring device for online metrology and calibration according to claim 1, characterized in that: The ultrasonic transducer measuring unit performs single-point detection and / or matrix multi-point detection during the circulation process.

9. The flue gas measuring device for online metrology and calibration according to claim 1, characterized in that: A connecting cable is provided between the ultrasonic transducer measuring unit and the MCU chip.

10. The on-line metrologically calibrated flue gas measuring device according to claim 1, characterized in that: It also includes a standard flow measurement unit, which is connected to the MCU chip.

11. The on-line metrologically calibrated flue gas measuring device according to claim 1, characterized in that: It also includes a display terminal, which is connected to the ultrasonic transducer measuring unit and the MCU chip at the same time.

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