Test assembly for optimizing flow field of primary air pipeline

Abstract

The invention discloses a test assembly for flow field optimization of a primary air pipeline, the test assembly is used for detecting the flow field pressure of the primary air pipeline and comprises a test pipe, a plurality of pressure drawing copper pipes and a pressure scanning valve, the peripheral wall of the test pipe is provided with a plurality of pressure drawing holes, and the plurality of pressure drawing holes are arranged at intervals along the circumferential direction of the test pipe; the two axial ends of the test pipe are a first end and a second end respectively, and the pressure guide hole is formed in at least one part, extending into the primary air pipeline, of the test pipe; one ends of the plurality of pressure drawing copper pipes in the axial direction extend into the accommodating space and are respectively communicated with the plurality of pressure drawing holes, and the other ends of the plurality of pressure drawing copper pipes extend out of the test pipe from the second end along the axial direction of the test pipe; the pressure scanning valve is connected with one end of the pressure drawing copper pipe extending out of the test pipe. According to the test assembly, the pressure scanning valve can conveniently and comprehensively calculate the flow field pressure of the primary air pipeline, and the test reliability of the test assembly is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of flow field optimization, and in particular to a test assembly for optimizing the flow field of a primary air duct. Background Art

[0002] In the primary air duct system of a coal-fired power plant, the uniformity of the flow field distribution is directly related to the pulverizing efficiency and combustion stability. In the existing technology, the analysis of the flow field characteristics of the primary air duct mainly relies on the following two methods:

[0003] Traditional single-point pressure measurement methods, which utilize fixed pressure measuring points (such as Pitot tubes or static pressure holes on the wall), can only obtain localized, discrete data and cannot reflect the circumferential pressure gradient distribution of the tube bundle. Especially under conditions of fluctuating pulverized coal concentration, single-point measurement can easily lead to distorted flow field assessment, making it difficult to identify flow field deflection and vortex shedding.

[0004] External vibration monitoring devices: Acceleration sensors are installed on the outer wall of the pipeline to indirectly infer the internal flow state. However, this method is significantly affected by the vibration of the pipeline support structure and cannot distinguish between fluid excitation forces and mechanical vibration components, resulting in spectrum analysis errors as high as 30%-40%.

[0005] The existing technology has the following key defects: the pressure and vibration signal acquisition devices are arranged separately (the pressure measurement point is located on the pipe wall, and the accelerometer is installed on the external bracket). The problem of spatiotemporal asynchrony leads to deviations in the flow-induced vibration correlation analysis, making it difficult to establish an accurate flow field-structure coupling model. Summary of the Invention

[0006] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a test assembly for optimizing the flow field in a primary air duct. The test assembly facilitates a pressure scanning valve to comprehensively calculate the flow field pressure in the primary air duct, thereby increasing the test reliability of the test assembly.

[0007] According to an embodiment of the present invention, a test assembly for optimizing the flow field of a primary air duct is used to detect the flow field pressure of the primary air duct and includes: a test tube, the test tube defines a accommodating space, a plurality of pressure-inducing holes are provided on the outer peripheral wall of the test tube, the plurality of pressure-inducing holes are arranged at intervals along the circumferential direction of the test tube, the axial ends of the test tube are respectively a first end and a second end, at least a portion of the test tube close to the first end is arranged in the primary air duct and extends in the radial direction of the primary air duct, the pressure-inducing holes are provided on at least a portion of the test tube extending into the primary air duct; a plurality of pressure-inducing copper tubes, one end of the plurality of pressure-inducing copper tubes in the axial direction of each of the plurality of pressure-inducing copper tubes extends into the accommodating space and is respectively connected one-to-one with the plurality of pressure-inducing holes, and the other end extends out of the test tube from the second end along the axial direction of the test tube; a pressure scanning valve, the pressure scanning valve is connected to one end of the pressure-inducing copper tube extending out of the test tube.

[0008] According to an embodiment of the present invention, a test assembly for optimizing the flow field of a primary air duct is provided with a plurality of pressure-inducing holes on at least the portion of the test tube extending into the primary air duct. One end of the plurality of pressure-inducing copper tubes in the axial direction extends into the test tube and is respectively connected to the plurality of pressure-inducing holes, and the other end extends from the second end along the axial direction of the test tube to be connected to the pressure scanning valve. The pressure copper tube can transmit the flow field pressure in a primary air duct to the pressure scanning valve via the pressure-inducing copper tube, so that the pressure scanning valve can comprehensively calculate the flow field pressure of the primary air duct, thereby increasing the test reliability of the test assembly.

[0009] In some embodiments of the present invention, the test tube includes: a shell body, the shell body is a stainless steel part, and the inner wall and the outer wall of the shell body are both provided with a ceramic coating.

[0010] In some embodiments of the present invention, the shell body is a 316L stainless steel piece; and / or the ceramic coating is an Al2O3-ZrO2 ceramic layer.

[0011] In some embodiments of the present invention, the ceramic coating satisfies a temperature resistance grade of T≥600°C; and / or, the ceramic coating satisfies a fly ash erosion rate tolerance of A≤0.1 mm / year.

[0012] In some embodiments of the present invention, the test assembly further includes: an acceleration sensor, wherein the acceleration sensor is provided on an end surface of the first end facing away from the second end.

[0013] In some embodiments of the present invention, the number of the pressure-inducing holes is no less than 8, and the multiple pressure-inducing holes are evenly spaced along the circumferential direction of the test tube. The number of the pressure-inducing copper tubes is the same as the number of the pressure-inducing holes.

[0014] In some embodiments of the present invention, the length of the pressure-drawing copper tube extending from the second end is S and satisfies: S≥300 mm.

[0015] In some embodiments of the present invention, the test assembly further comprises: a connecting tube, one end of which is connected to an end of the pressure-inducing copper tube away from the pressure-inducing hole, and the other end of which is connected to the pressure scanning valve.

[0016] In some embodiments of the present invention, the test assembly further includes: a connecting flange, and the connecting flange is used to connect the test tube and the primary air duct.

[0017] In some embodiments of the present invention, the connecting flange is a quick-release clamp.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a test assembly and a primary air duct according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a test tube and a pressure-inducing copper tube of a test assembly according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram from another perspective of a test tube and a pressure-inducing copper tube of a test assembly according to an embodiment of the present invention;

[0023] Figure 4 4 is a cross-sectional view of a test tube and a pressure-inducing copper tube of a test assembly according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] 100. Test components;

[0026] 1. Test tube; 11. Accommodation space; 12. Pressure inlet; 13. Erosion-resistant section; 14. Connecting section;

[0027] 2. Pressure-inducing copper tube; 3. Pressure scanning valve; 4. Acceleration sensor; 5. Connecting pipe;

[0028] 200. Primary air duct. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] Reference below Figure 1-Figure 4 A test assembly 100 for optimizing the flow field of a primary air duct 200 according to an embodiment of the present invention is described.

[0033] like Figure 1 and Figure 2 As shown, the test assembly 100 for optimizing the flow field of a primary air duct 200 according to an embodiment of the present invention includes a test tube 1 , a plurality of pressure-inducing copper tubes 2 and a pressure scanning valve 3 .

[0034] Specifically, the test assembly 100 is used to detect the flow field pressure in the primary air duct 200, facilitating confirmation of the flow field pressure within the primary air duct 200 and timely monitoring of the flow field conditions within the primary air duct 200. The primary air duct 200 serves as both the burner's air duct and the pulverized coal transport channel, thereby increasing the reliability of pulverized coal transport.

[0035] The test tube 1 defines a receiving space 11. A plurality of pressure-inducing holes 12 are provided on the outer peripheral wall of the test tube 1. The plurality of pressure-inducing holes 12 are arranged at intervals along the circumferential direction of the test tube 1. The axial ends of the test tube 1 are respectively a first end and a second end. At least a portion of the test tube 1 close to the first end is provided in the primary air duct 200 and extends in the radial direction of the primary air duct 200. The pressure-inducing holes 12 are provided on at least a portion of the test tube 1 extending into the primary air duct 200, so that the pressure-inducing holes 12 can be connected to the internal flow field of the primary air duct 200. The axial direction of the plurality of pressure-inducing copper tubes 2 (such as Figure 2 One end of each of the pressure-inducing copper tubes 2 (in the first direction shown) extends into the accommodation space 11 and communicates with each of the multiple pressure-inducing holes 12. The other end extends out of the test tube 1 from the second end along the axial direction of the test tube 1. The pressure scanning valve 3 is connected to the end of the pressure-inducing copper tube 2 that extends out of the test tube 1. The pressure-inducing copper tube 2 transmits the flow field pressure within the primary air duct to the pressure scanning valve 3 via the pressure-inducing copper tube 2, facilitating the pressure scanning valve 3 to comprehensively calculate the flow field pressure in the primary air duct 200, thereby increasing the testing reliability of the test assembly 100.

[0036] According to an embodiment of the present invention, a test assembly 100 for optimizing the flow field of a primary air duct 200 is provided with a plurality of pressure-inducing holes 12 on at least the portion of the test tube 1 extending into the primary air duct 200. One end of the plurality of pressure-inducing copper tubes 2 in the axial direction extends into the test tube 1 and is respectively connected to the plurality of pressure-inducing holes 12, and the other end extends from the second end along the axial direction of the test tube 1 to be connected to the pressure scanning valve 3. The pressure copper tube can transmit the flow field pressure in a primary air duct to the pressure scanning valve 3 via the pressure-inducing copper tube 2, so that the pressure scanning valve 3 can comprehensively calculate the flow field pressure of the primary air duct 200, thereby increasing the test reliability of the test assembly 100.

[0037] In some embodiments of the present invention, the test tube 1 includes a shell body, which is made of stainless steel, and the inner and outer walls of the shell body are both provided with a ceramic coating. Stainless steel has good corrosion resistance and good rigidity, which can prevent the stainless steel from being worn when impacted by the flow field in the primary air duct 200, and prevent the particles generated by wear from clogging the pressure-inducing hole 12; the inner and outer walls of the shell body are both provided with a ceramic coating. In the high-temperature and high-dust environment of the primary air duct 200, the double-layer ceramic coating structure improves the erosion resistance by more than 5 times, extending the service life to 2 years, further preventing the stainless steel from being worn when impacted by the flow field in the primary air duct 200, and preventing the particles generated by wear from clogging the pressure-inducing hole 12.

[0038] In some embodiments of the present invention, the shell body is made of 316L stainless steel. In this case, the shell body has better corrosion resistance, higher hardness and strength, and effectively avoids wear of the shell body.

[0039] In some embodiments of the present invention, the ceramic coating is an Al2O3-ZrO2 ceramic layer, which exhibits excellent mechanical, thermal, and chemical stability. Alumina provides high hardness and wear resistance, while zirconium oxide provides good toughness and thermal shock resistance. The ceramic coating has high density, low porosity, and fine grain size, thereby improving the overall performance of the test tube 1.

[0040] In some embodiments of the present invention, the ceramic coating meets the temperature resistance level T≥600°C, so that the test component 100 coated with the ceramic coating can operate in a high-temperature primary air duct 200, ensuring the working reliability of the test component 100.

[0041] In some embodiments of the present invention, the ceramic coating meets the requirement of withstanding fly ash erosion rate A≤0.1 mm / year, so that the test assembly 100 coated with the ceramic coating can operate in the primary air duct 200 transporting pulverized coal, ensuring the working reliability of the test assembly 100.

[0042] In some embodiments of the present invention, Figure 1 As shown, the test assembly 100 also includes an acceleration sensor 4, which is arranged on the end face of the first end facing away from the second end. The acceleration sensor 4 is arranged at a position of the test block close to the center of the primary air duct 200, and can monitor the flow field velocity in the primary air duct 200, so as to facilitate confirmation of the flow field working status of the primary air duct 200.

[0043] In some embodiments of the present invention, the number of pressure-inducing holes 12 is no less than 8, and the multiple pressure-inducing holes 12 are evenly spaced along the circumferential direction of the test tube 1. The number of pressure-inducing copper tubes 2 is the same as the number of pressure-inducing holes 12, that is, the pressure-inducing copper tubes 2 are arranged at no less than 8 locations along the circumference, and after being connected to the pressure scanning valve 3, the flow field pressure is collected in real time. A flow field pulsating pressure-tube wall vibration response correlation model (such as PSD cross-spectrum analysis) can be established to accurately distinguish between fluid excitation and mechanical vibration components, and the error is reduced to within 8%.

[0044] In this embodiment, the number of pressure-inducing holes 12 is 16. The high-density layout of the pressure-inducing holes 12 combined with the circumferentially arranged pressure-inducing copper tubes 2 increases the accuracy of circumferential pressure field reconstruction to 92% (the traditional 8-hole solution is only 75%), which is particularly suitable for diagnosing strong vortex conditions caused by coal powder concentration segregation.

[0045] In some embodiments of the present invention, Figure 3 As shown, the length of the pressure-leading copper tube 2 extending from the second end is S and satisfies: S≥300mm, that is, the distance between the end of the pressure-leading copper tube 2 connected to the pressure scanning valve 3 and the test tube 1 is not less than 300mm, which can avoid the high temperature and high erosion conditions in the primary air duct 200 affecting the operation of the pressure scanning valve 3 and increase the working reliability of the pressure scanning valve 3.

[0046] In some embodiments of the present invention, Figure 1 As shown, the test assembly 100 further includes a connecting tube 5, one end of which is connected to the end of the pressure-inducing copper tube 2 away from the pressure-inducing hole 12, and the other end of which is connected to the pressure scanning valve 3, thereby facilitating the connection between the pressure-inducing copper tube 2 and the pressure scanning valve 3. In this embodiment, the connecting tube 5 is a flexible tube that can be sleeved around the outer wall of the end of the pressure-inducing copper tube 2 away from the pressure-inducing hole 12, thereby increasing the reliability of the connection between the pressure-inducing copper tube 2 and the pressure scanning valve 3.

[0047] In some embodiments of the present invention, the test assembly 100 further includes a connecting flange, which is used to connect the test tube 1 and the primary air duct 200, making the connection between the test tube 1 and the primary air duct 200 simpler and more reliable.

[0048] Furthermore, the connecting flange is a quick-release clamp, which can be installed by ordinary workers using a wrench, thereby reducing the time cost of connecting the test tube 1 and the primary air duct 200.

[0049] In this embodiment, the test assembly 100 is 2100 mm long and consists of an erosion-resistant section 13 (600 mm long, Ø400 mm outer diameter) and a connecting section 14 (1500 mm long, Ø400 mm outer diameter). The erosion-resistant section 13 is constructed of a double-layer, ceramic-coated stainless steel tube, with a 4 mm thick inner layer of 316L stainless steel and a 0.8 mm thick outer Al2O3-ZrO2 ceramic layer. The pressure-drawing copper tubes 2 are evenly spaced around the circumference, with spacing of approximately 50 mm. The pressure-drawing copper tubes 2 have an inner diameter of 1.2 mm and an outer diameter of 2.5 mm, extending 300 mm beyond the connecting section 14.

[0050] The shell body is machined integrally using a five-axis CNC machine to avoid welding deformation. The ceramic coating is applied via a plasma spraying process with a spray power of 45kW and an argon flow rate of 80L / min. The coating has a bond strength of ≥60MPa and a porosity of <2%.

[0051] 16 Φ4mm pressure-inducing holes 12 are evenly distributed along the circumference (angle interval is 22.5 degrees), and the opening of the pressure-inducing hole 12 is chamfered by 0.2mm to reduce air resistance. The pressure-inducing copper tube 2 and the pressure-inducing hole 12 are connected by laser micro-welding, and the air tightness of the weld reaches 10 in an argon protection environment. -7 Pa·m 3 The end of the pressure-inducing copper tube 2 is connected to the PSI 9016 electronic pressure scanning valve through a connecting pipe (Φ6mm high-temperature resistant PTFE hose). The connecting pipe 5 has a temperature resistance of 250°C, and the response time of the pressure hysteresis compensation algorithm is less than 5ms.

[0052] Insert the test assembly 100 vertically into the primary air duct 200 through the connecting flange, ensuring that the parallelism error between the axis of the primary air duct 200 and the airflow direction is less than 0.5°. Perform the following operations before installation:

[0053] Natural frequency calibration: The test assembly 100 was excited using a force hammer method, and the spectrum analyzer measured the first-order bending frequency to be 78.2 Hz, which meets the requirement of avoiding the fan fundamental frequency (25-35 Hz) connected to the primary air duct 100;

[0054] Backflush system test: Start 0.8MPa compressed air pulse backflush (cycle 20s), and visually check that there is no dust accumulation on each pressure inlet;

[0055] High temperature cycle verification: Pass 450°C hot air for 8 hours to confirm that the data drift of the pressure scanning valve 3 is less than 0.1% FS.

[0056] Execute before formal operation:

[0057] Cold flow field calibration: Adjust the air volume in the primary air duct 200 to the design value (15m / s), collect 30 minutes of baseline pressure-vibration data, and establish a threshold for determining boiler biased burning;

[0058] Thermal monitoring start: After the coal mill is put into operation, the following is executed every 5 minutes:

[0059] Synchronously collect the pressure data of 16 pressure-inducing copper tubes 2 (sampling rate 1kHz) and the orthogonal vibration signal of the acceleration sensor 4 (frequency band 0-500Hz);

[0060] Maintenance cycle setting: Replace the backflush filter element every 2000 hours of operation and use an endoscope to check the status of the pressure-inducing hole.

[0061] After system shutdown:

[0062] Maintain compressed air backflushing for 30 minutes to remove residual coal powder from the test assembly 100 and the primary air duct 200;

[0063] Before disconnecting the power supply of the pressure scanning valve 3, perform -10kPa negative pressure suction to prevent condensate from being retained in the pressure scanning valve 3;

[0064] The acceleration sensor 4 is coated with high-temperature anti-oxidation paste to extend its service life.

[0065] Data processing:

[0066] The pressure of the pressure-drawing copper tube 2, as detected by the pressure scanning valve 3, is a time-domain signal of the pressure around the test assembly 100. This is a discrete digital force signal, directly oriented towards force analysis. The pressure time-domain data within the turbulent buffeting range is selected for analysis. The discrete digital pressure time-domain signal is imported into Matlab software, and the pressure data is integrated to obtain the lift and drag forces of the multiple pressure-drawing copper tubes 2. This is then converted to fluid forces using trigonometric functions, and the autocorrelation power spectral density of the fluid forces is calculated using window functions and Pwelch functions.

[0067] Functional spectrum estimation can generally be divided into parametric and nonparametric methods. The data processing method used here is the Welch method, a commonly used nonparametric method and an improved direct spectrum estimation method. This is implemented using the pwelch function in the MATLAB Signal Processing Toolbox.

[0068] For the Welch method, when the number of data segments increases and the length of each segment is shorter, the spectral resolution decreases significantly, while the spectral estimation curve is smoother and the variance is smaller; conversely, when the number of data segments decreases and the length of each segment is longer, the spectral resolution increases significantly, the spectral estimation curve fluctuates more, and the variance is larger.

[0069] The concept of equivalent power spectral density, first proposed by Axisa et al., is used. The correlation length is a parameter used to define the equivalent power spectral density. Assuming that the fluid excitation force is random and ergodic, and that there are sufficient broadband processes near the natural frequency of the pipe, the vibration response can be calculated using classical random vibration theory. In the case of weak structural damping, the modal displacement root mean square response is considered to be a uniform transverse flow, and can be expressed as a function of the power spectral density:

[0070]

[0071] Where: L—the length of the tube excited by the fluid; —Mode shape; M n —modal mass; f n —natural frequency; n —modal damping; a n —modal correlation coefficient; Φ E —Equivalent power spectral density of the exciting force per unit tube length introduced by Asixa et al.

[0072] The relationship between the equivalent power spectral density and the autocorrelation power spectral density Φ is:

[0073]

[0074] Where: c —Correlation length that characterizes spatial correlation.

[0075] To define a dimensionless form of the reference equivalent power spectral density, two normalization factors, f0 and p0, are used. f0 is used to scale the frequency, and p0 is used to scale the pressure. Proper selection of the scaling factor can improve the concentration of the experimental data, thereby obtaining a better fluid force spectrum. After comparison and analysis, a dimensionless normalization factor for the two-phase flow excitation force based on the interface flow velocity was selected. The dimensionless formula is:

[0076]

[0077] Based on the normalization factors f0 and p0 of the interface flow velocity, the expression is as follows:

[0078] f0=v i / D w

[0079] p0=ρ l gD w

[0080]

[0081] Substituting the calculated normalization factors f0 and p0 and the reference equivalent power spectral density Φ0E(fn) into the formula can obtain the dimensionless reference equivalent power spectral density.

[0082] Other structures and operations of the test assembly 100 for optimizing the flow field of the primary air duct 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0083] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A test assembly for optimizing the flow field of a primary air duct, characterized in that: Used to detect the flow field pressure of the primary air duct and includes: a test tube, wherein the test tube defines a receiving space, a plurality of pressure-inducing holes are provided on an outer peripheral wall of the test tube, the plurality of pressure-inducing holes being spaced apart along the circumferential direction of the test tube, the axial ends of the test tube being respectively a first end and a second end, at least a portion of the test tube proximate the first end being disposed within the primary air duct and extending in a radial direction of the primary air duct, and the pressure-inducing holes being provided on at least the portion of the test tube extending into the primary air duct; a plurality of pressure-inducing copper tubes, wherein one end of each of the plurality of pressure-inducing copper tubes extends into the accommodation space and is respectively connected to the plurality of pressure-inducing holes, and the other end extends out of the test tube from the second end along the axial direction of the test tube; A pressure scanning valve is connected to the end of the pressure-inducing copper tube extending out of the test tube.

2. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: The test tube comprises: The shell body is made of stainless steel, and both the inner wall and the outer wall of the shell body are provided with ceramic coatings.

3. The test assembly for optimizing the flow field of a primary air duct according to claim 2, characterized in that: The shell body is made of 316L stainless steel; And / or, the ceramic coating is an Al2O3-ZrO2 ceramic layer.

4. The test assembly for optimizing the flow field of a primary air duct according to claim 2, characterized in that: The ceramic coating meets the temperature resistance level T≥600°C; And / or, the ceramic coating meets the requirement of withstanding fly ash erosion rate A≤0.1 mm / year.

5. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: Also includes: An acceleration sensor is provided on an end surface of the first end facing away from the second end.

6. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: The number of the pressure-inducing holes is no less than 8, and the plurality of pressure-inducing holes are evenly spaced along the circumferential direction of the test tube. The number of the pressure-inducing copper tubes is the same as the number of the pressure-inducing holes.

7. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: The length of the pressure-drawing copper tube extending from the second end is S and satisfies: S≥300mm.

8. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: Also includes: A connecting pipe, one end of which is connected to one end of the pressure-inducing copper pipe away from the pressure-inducing hole, and the other end of which is connected to the pressure scanning valve.

9. The test assembly for optimizing the flow field of a primary air duct according to claim 1, characterized in that: Also includes: A connecting flange is used to connect the test tube and the primary air duct.

10. The test assembly for optimizing the flow field of a primary air duct according to claim 9, characterized in that: The connecting flange is a quick-release clamp.

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