Device and method for automatically measuring dynamic pressure of powder feeding pipeline based on uniform-section ring dividing method

Abstract

The invention discloses a device and a method for automatically measuring the dynamic pressure of a powder feeding pipeline based on a uniform-section ring dividing method. The device comprises a pulverized coal pipeline, a standard backrest pipe, an electromagnetic valve, a hose, a compressed air source, a data collector and a controller, the standard backrest pipe is arranged at a to-be-detected position of the pulverized coal pipeline and is connected with a steering driving mechanism and a translation driving mechanism; interfaces I of the first electromagnetic three-way valve and the second electromagnetic three-way valve are connected with a pressure measuring opening of the standard backrest pipe; interfaces II and interfaces III are connected with a compressed air source and a pressure sensor; the first pressure sensor and the second pressure sensor are connected with the input end of the data collector, the controller is connected with the first electromagnetic three-way valve, the second electromagnetic three-way valve, the electromagnetic valve, the control end of the steering driving mechanism, the control end of the translation driving mechanism and the data collector, and automatic measurement of uniform-section dynamic pressure is achieved. The problem of low manual measurement efficiency is solved; the telescopic backrest pipe is adopted, the pipeline is withdrawn when measurement is not carried out, and abrasion is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of combustion measurement and control of coal-fired boilers, and specifically relates to an automatic measurement device and method for the dynamic pressure of a powder delivery pipeline based on the equal-section ring division method, which is suitable for the automatic and precise measurement of the dynamic pressure and static pressure of coal powder in the primary air powder pipe of a coal-fired boiler pulverizing system. Background Art

[0002] While the scale of installed renewable energy capacity continues to expand and its share continues to rise, its inherent output volatility and intermittency, coupled with bottlenecks in energy consumption and the lack of maturity in energy storage technology, have yet to yield breakthroughs. Therefore, thermal power will continue to play a vital role in ensuring power supply for a considerable period of time. The rapid development of the new energy industry has not only not diminished the strategic value of thermal power, but has also accelerated the evolution of the thermal power technology system towards efficient and flexible operation, deep peak-shaving response, and clean, low-carbon emissions. Furthermore, during the transitional phase of energy structure transformation, thermal power will gradually shift from being the primary power source to providing system regulation and support.

[0003] In the coal-fired boiler system of a thermal power plant, the primary air pulverized coal pipe serves as a key channel for conveying pulverized coal and primary air. The gas-solid two-phase flow characteristics within it directly affect the boiler's combustion efficiency, operational safety, and pollutant emission levels. Dynamic pressure and static pressure, as important parameters characterizing the flow state of pulverized coal, not only determine the conveying concentration and flow velocity distribution of pulverized coal, but also serve as the basis for combustion optimization and control. Accurate measurement of dynamic and static pressures plays a decisive role in achieving precise adjustment of the air-coal ratio, preventing pipeline blockage due to pulverized coal accumulation, and avoiding abnormal operating conditions such as burner extinguishing. Therefore, in the coal-fired boiler system of a thermal power plant, accurate measurement of dynamic and static pressures in the primary air pulverized coal pipe is crucial for combustion optimization and operational safety.

[0004] However, traditional measurement methods have two significant shortcomings: First, the existing method of measuring the dynamic pressure of pulverized coal gas flow in pulverized coal pipelines using the equal-section ring method relies primarily on manual operation, which is not only inefficient but also difficult to achieve real-time monitoring, failing to meet the data timeliness requirements of smart power plants. Second, currently common automated measurement devices or methods for pulverized coal gas flow pressure, such as the permanent installation of a standard back-up pipe pressure gauge port in the center of the pulverized coal pipeline to measure dynamic pressure, lack the measurement accuracy and reliability of the equal-section ring method. Furthermore, when the standard back-up pipe in the pulverized coal pipeline is continuously subjected to the erosion of high-speed pulverized coal gas flow, it will cause rapid wear of the measuring element, seriously affecting measurement accuracy and equipment life. Summary of the Invention

[0005] The present application aims to provide a kind of based on equal cross section sub-ring method's powder feeding pipeline dynamic pressure automatic measuring device and its operating method, for the dynamic pressure and static pressure of coal powder gas flow in conveying pipeline are measured accurately and automatically.

[0006] In order to achieve the above-mentioned purpose, one aspect of the present application provides a kind of based on equal cross section sub-ring method's powder feeding pipeline dynamic pressure automatic measuring device, including first pressure sensor, second pressure sensor, first electromagnetic three-way valve, second electromagnetic three-way valve, coal powder pipeline, standard backrest pipe, solenoid valve, hose, compressed air source, data acquisition device and controller;Standard backrest pipe is arranged at the measuring place of coal powder pipeline, standard backrest pipe is connected with steering drive mechanism and translation drive mechanism, steering drive mechanism is used to drive standard backrest pipe to rotate around its axis, and translation drive mechanism is used to drive standard backrest pipe to translate along its axis;The interface one of first electromagnetic three-way valve and second electromagnetic three-way valve is connected with the pressure measuring port of standard backrest pipe, and the interface two and interface three of first electromagnetic three-way valve and second electromagnetic three-way valve are connected with compressed air source and pressure sensor;First pressure sensor and second pressure sensor are connected with the input end of data acquisition device, and the controller is connected with the control end of first electromagnetic three-way valve, second electromagnetic three-way valve, solenoid valve, steering drive mechanism, translation drive mechanism and data acquisition device.

[0007] Further, the standard backrest pipe is cylindrical outer surface, the outer side of standard backrest pipe is provided with steering gear teeth and translation gear teeth, steering drive mechanism includes steering gear and steering motor, the output end of steering motor is connected with steering gear, and steering gear is engaged with steering gear teeth;Translation drive mechanism includes translation gear and translation motor, the output end of translation motor is connected with translation gear, and translation gear is engaged with translation gear teeth.

[0008] Further, the outer side of steering gear and translation gear is provided with gear protection box.

[0009] Further, the outer diameter of standard backrest pipe is same with the inner diameter of solenoid valve connection port.

[0010] Further, the pressure measuring port of one side of standard backrest pipe is opposite to the incoming direction of coal powder gas flow, and the moving distance of standard backrest pipe is not less than the inner diameter of coal powder pipeline.

[0011] Further, the cross section of coal powder pipeline is divided into several equal-area concentric rings, and the measuring points are arranged on the center lines of each equal-area circular ring.

[0012] Further, translation distance sensor and rotation angle sensor are arranged on standard backrest pipe, and translation distance sensor and rotation angle sensor are connected with the input end of controller through data acquisition device.

[0013] In another aspect, the present application provides a method for automatically measuring the dynamic pressure of a powder feeding pipeline based on the equal cross-section split ring method, which uses the device for automatically measuring the dynamic pressure of a powder feeding pipeline based on the equal cross-section split ring method, and comprises the following steps: The electromagnetic valve is switched to the open state, and the controller controls the translation driving mechanism to drive the standard backrest pipe to move into the circular coal powder pipeline and to translate the pressure measuring port of the standard backrest pipe to the center of the coal powder pipeline; The controller controls the rotation driving mechanism to drive the standard backrest pipe to rotate clockwise or counterclockwise until the deviation of the measurement values of the first pressure sensor and the second pressure sensor is within the set value, and the average of the measurement values of the first pressure sensor and the second pressure sensor at this moment is taken as the static pressure at the center of the circular coal powder conveying pipeline; After the static pressure at the center of the coal powder conveying pipeline is measured, the controller controls the rotation driving mechanism to drive the standard backrest pipe to rotate counterclockwise or clockwise by a set angle to return to the initial position; The controller controls the translation driving mechanism to drive the standard backrest pipe to translate the pressure measuring port thereof to the first measuring point closest to the inlet of the side wall of the coal powder pipeline, and then drives the pressure measuring port of the standard backrest pipe to translate into the pipeline; During the movement into the circular coal powder pipeline, the pressure measuring port of the standard backrest pipe moves to different measuring points in the coal powder pipeline in turn, and stays for a set time, and the absolute value of the difference between the measurement values of the first pressure sensor and the second pressure sensor is the dynamic pressure value at the measuring point; When the standard backrest pipe is inserted to the deepest part of the coal powder pipeline, the controller controls the translation driving mechanism to drive the standard backrest pipe to move to the outside of the coal powder pipeline; During the movement to the outside of the coal powder pipeline, the pressure measuring port of the standard backrest pipe moves to the same measuring points as in the entering process, and stays for a set time, and the measurement is performed twice for insertion and extraction, and the dynamic pressures measured twice are arithmetically averaged to be taken as the dynamic pressure at the measuring point; After the dynamic pressure measurement is completed twice for insertion and extraction, the controller controls the translation driving mechanism to move the pressure measuring port of the standard backrest pipe out of the coal powder pipeline, and switches the electromagnetic valve to the closed state.

[0014] Further, before each measurement, the first electromagnetic three-way valve and the second electromagnetic three-way valve are switched to be in communication with the pressure measuring port of the standard backrest pipe and the compressed air source under the control of the controller, so as to clean the standard backrest pipe, and after the cleaning is completed, the first electromagnetic three-way valve and the second electromagnetic three-way valve are switched to be connected with the pressure measuring port of the standard backrest pipe and the pressure sensor.

[0015] Further, when the measurement is performed twice for insertion and extraction, the fluctuation of the dynamic pressure measured twice at the same measuring point does not exceed ±2%, otherwise the measurement at the point should be performed again.

[0016] Compared with the prior art, the device has at least the following beneficial technical effects: the device can realize automatic measurement of equal-section dynamic pressure, solves the problem of low efficiency of manual measurement, and greatly reduces wear by retracting the pipeline when not measuring; the device improves data accuracy by multi-point measurement, and provides reliable basis for combustion optimization; the device realizes automatic calibration of the position of the standard backrest pipe by the steering drive mechanism, ensures that the total pressure hole is strictly perpendicular to the flow direction to improve the reliability and accuracy of the measured dynamic pressure; and the system can be connected with DCS to meet the needs of intelligent power plant construction.

[0017] Further, the outer surface of the standard backrest pipe is a cylindrical surface for machining the steering gear teeth and the translation gear teeth, only the structure of the outer surface of the standard backrest pipe is designed and adjusted, and the measurement accuracy of the standard backrest pipe is not affected.

[0018] Further, the diameter of the cylindrical outer surface of the standard backrest pipe is the same as the inner diameter of the electromagnetic valve to better ensure the sealing of the device.

[0019] Further, when installing the standard backrest pipe, the pressure measuring port on one side of the standard backrest pipe is ensured to be perpendicular to the flow direction of the pulverized coal gas flow, the measurement deviation is reduced, and the posture of the standard backrest pipe is automatically adjusted by the steering system to ensure that the total pressure hole is strictly perpendicular to the flow direction to improve the reliability and accuracy of the measured dynamic pressure.

[0020] Further, the distance from the pressure measuring port of the standard backrest pipe to the edge of the steering gear teeth L is long enough to ensure that the pressure measuring port of the standard backrest pipe can contact the inner surface of the circular pulverized coal pipeline far away.

[0021] Further, the inlet of the electromagnetic three-way valve is connected to the pressure measuring port of the standard backrest pipe through a hose, the two outlets of the electromagnetic three-way valve are connected to the compressed air source and the pressure sensor through hoses respectively, and the connection of the pressure measuring port of the standard backrest pipe and the compressed air source or the pressure sensor is switched by the electromagnetic three-way valve, which is helpful to realize remote automatic switching.

[0022] Further, when measuring the dynamic pressure of each measuring point, two measurements of insertion and extraction should be performed, the dynamic pressure fluctuation of two measurements at the same measuring point should not exceed ±2%, otherwise the point should be re-measured, and the dynamic pressure of two measurements is taken as the arithmetic mean of the point dynamic pressure to ensure the reliability of the measurement result.

[0023] Further, under the control of the controller, the pulverized coal in the backrest pipe is cleaned at a certain frequency by using the compressed air source of the power plant to reduce the blocking phenomenon in the backrest pipe. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1The axial view and the local enlarged view of the main part of the powder feeding pipeline dynamic pressure automatic measuring device based on the equal cross-section split ring method are provided.

[0025] Figure 2 The front view of the powder feeding pipeline dynamic pressure automatic measuring device based on the equal cross-section split ring method is provided.

[0026] Figure 3 The top view of the main part of the powder feeding pipeline dynamic pressure automatic measuring device based on the equal cross-section split ring method is provided.

[0027] Figure 4 The side view and the sectional view of the front view of the main part of the powder feeding pipeline dynamic pressure automatic measuring device based on the equal cross-section split ring method are provided.

[0028] Figure 5 The structure schematic diagram of a standard backrest tube is provided. Only the structure of the outer surface of the standard backrest tube is designed and adjusted, and the measurement accuracy of the standard backrest tube is not affected.

[0029] In the drawings, 1 is a first pressure sensor, 2 is a second pressure sensor, 3 is a first electromagnetic three-way valve, 4 is a second electromagnetic three-way valve, 5 is a pulverized coal pipeline, 6 is a standard backrest tube, 7 is an electromagnetic valve, 8 is a steering gear, 9 is a steering gear tooth, 10 is a steering motor, 11 is a translation gear, 12 is a translation gear tooth, 13 is a translation motor, 14 is a gear protection box, 15 is a pipe base, 16 is a hose, 17 is a compressed air source, 18 is a data collector, and 19 is a controller. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0031] In view of the technical problems described in the background art, the present patent proposes an innovative solution: first, a fully automatic equal cross-section dynamic pressure measuring system is developed, which realizes automatic collection and processing of multi-point data through intelligent control, significantly improving the measurement efficiency and accuracy; second, a telescopic structure design is adopted, so that the backrest tube only extends into the pipeline during measurement and is completely withdrawn during non-measurement period, which fundamentally avoids the continuous erosion of the pulverized coal gas flow. These two technologies complement each other, not only realizing the precise automatic monitoring of dynamic pressure, but also greatly prolonging the service life of the equipment, providing reliable technical support for the intelligent upgrading of the combustion system of the thermal power plant.

[0032] The equal cross-section split ring method can be used to measure the average dynamic pressure on the circular cross-section of the pulverized coal pipeline, that is, the circular cross-section of the pulverized coal pipeline is divided into a plurality of equal-area concentric rings, and the measuring points are arranged on the center lines of the equal-area circular rings. The existing dynamic pressure measurement of the pulverized coal gas flow in the pulverized coal pipeline using the equal cross-section split ring method mainly relies on manual operation, which is not only low in efficiency, but also difficult to realize real-time monitoring, and cannot meet the requirements of intelligent power plants on data timeliness. Therefore, the purpose of the present application is to provide a pulverized coal pipeline dynamic pressure automatic measurement device and operation method based on the equal cross-section split ring method, which is used for automatically and accurately measuring the dynamic pressure and static pressure of the pulverized coal gas flow in the conveying pipeline. Considering that the use of a Pitot tube to measure the dynamic pressure and static pressure of the pulverized coal gas flow is prone to blockage, a standard backrest pipe is selected to measure the dynamic pressure and static pressure of the pulverized coal gas flow.

[0033] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , a pulverized coal pipeline dynamic pressure automatic measurement device based on the equal cross-section split ring method, comprising a first pressure sensor 1, a second pressure sensor 2, a first electromagnetic three-way valve 3, a second electromagnetic three-way valve 4, a pulverized coal pipeline 5, a standard backrest pipe 6, an electromagnetic valve 7, a steering gear 8, a steering gear tooth 9, a steering motor 10, a translation gear 11, a translation gear tooth 12, a translation motor 13, a gear protection box 14, a pipe base 15, a hose 16, a compressed air source 17, a data acquisition device 18 and a controller 19. The steering gear 8, the steering gear tooth 9, the translation gear 11 and the translation gear tooth 12 are installed in the gear protection box 14. The first pressure sensor 1 and the second pressure sensor 2 are connected to the input end of the data acquisition device 18, and the output end of the controller 19 is connected to the first electromagnetic three-way valve 3, the second electromagnetic three-way valve 4, the electromagnetic valve 7, the steering motor 10, the translation motor 13 and the data acquisition device 18.

[0034] The standard backrest pipe 6 is cylindrical in shape, and the steering gear 8, the steering gear tooth 9, the translation gear 11 and the translation gear tooth 12 are machined on the outer side of the standard backrest pipe 6. It should be noted that only the structure of the outer surface of the standard backrest pipe is designed and adjusted, which does not affect the measurement accuracy of the standard backrest pipe. The diameter of the cylindrical outer surface of the standard backrest pipe 6 and the communication inner diameter of the electromagnetic valve 7 are the same, so as to better ensure the sealing property of the device, and the standard backrest pipe 6 is sleeved on the outside of the electromagnetic valve 7 connecting pipe. When installing the standard backrest pipe 6, it is ensured that the pressure measuring port on one side of the standard backrest pipe 6 is opposite to the incoming direction of the pulverized coal gas flow. The distance from the pressure measuring port of the standard backrest pipe 6 to the edge of the steering gear tooth should be long enough to ensure that the pressure measuring port of the standard backrest pipe 6 can contact the inner surface of the circular pulverized coal pipeline far away, and the distance is preferably L . Figure 5

[0035] ​When the average dynamic pressure on the cross section of the circular coal pipe is measured by the equal cross section ring method, the measuring points are arranged on the center line of each equal area ring.

[0036] The translation gear 11, the translation gear tooth 12, the translation motor 13 and the controller 19 constitute the translation system of the standard backrest tube. The steering gear 8, the steering gear tooth 9, the steering motor 10 and the controller 19 constitute the steering system of the standard backrest tube. The key to measure the dynamic pressure by the standard backrest tube 6 is that the total pressure hole of the backrest tube is strictly perpendicular to the flow direction, so the posture of the standard backrest tube 6 is automatically adjusted by the design of the steering system to ensure that the total pressure hole is strictly perpendicular to the flow direction, and the pressure measuring hole is perpendicular to the flow direction to improve the reliability and accuracy of the dynamic pressure measurement.

[0037] Under the control of the controller 19, the coal powder in the standard backrest tube 6 is cleaned at a set frequency by using the power plant compressed air source to reduce the plugging phenomenon in the standard backrest tube 6. Specifically, the inlet of the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 is connected to the pressure measuring hole from the standard backrest tube 6 through the hose 16, and the interface two and the interface three of the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 are connected to the compressed air source 17 and the pressure sensor through the hose respectively. The connection between the pressure measuring hole of the standard backrest tube 6 and the compressed air source 17 or the pressure sensor is switched by the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4.

[0038] When measuring the dynamic pressure of each measuring point, the standard backrest tube 6 is inserted into and extracted from the coal pipe twice, and the fluctuation of the dynamic pressure measured twice at the same measuring point should not exceed ±2%, otherwise the point should be measured again. The dynamic pressure measured twice is arithmetically averaged as the dynamic pressure of the point.

[0039] Alternatively, the device described in the application can be modularly assembled, the steering drive mechanism and the translation drive mechanism are arranged on a frame, the first pressure sensor 1, the second pressure sensor 2, the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 are connected to the coal pipe 5 through the frame rack, and the corresponding steering gear tooth 9 and translation gear tooth 12 can be arranged on the standard backrest tube 6. A mechanical hand standard backrest tube 6 can also be arranged to connect and realize the rotation and translation of the standard backrest tube 6.

[0040] Embodiment 2 simultaneously provides a running method of the dynamic pressure automatic measuring device of the powder feeding pipe based on the equal cross section ring method as described above, which comprises the following steps: Under the control of the controller 19, the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 are switched to connect the pressure measuring hole and the compressed air source 17 to clean the coal powder in the standard backrest tube 6. After cleaning, the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 are switched to connect the pressure measuring hole to the first pressure sensor 1 and the second pressure sensor 2 respectively; The electromagnetic valve 7 is switched to the open state, and the controller 19 controls the translation motor 13 to drive the translation gear 11 to move, and then drive the translation gear teeth 9 on the standard backrest tube 6 to move into the circular coal pipe, and move the pressure measuring port of the standard backrest tube 6 to the center of the coal pipe 5; The controller 19 controls the steering motor 10 to drive the steering gear 8 to rotate, and then drive the steering gear teeth 9 on the standard backrest tube to rotate clockwise (or counterclockwise), until the deviation between the measured values of the first pressure sensor 1 and the second pressure sensor 2 is within 10 Pa, and the average value of the measured values of the first pressure sensor 1 and the second pressure sensor 2 at this time is taken as the static pressure at the center of the coal pipe 5; After the static pressure at the center of the coal pipe 5 is measured, the controller 19 controls the steering gear 8 to drive the standard backrest tube 6 to rotate counterclockwise (or clockwise) by 90 degrees to return to the original position; The controller 19 controls the translation motor 13 to drive the translation gear 11 to move, and then drive the translation gear teeth 12 on the standard backrest tube 6 to move the pressure measuring port to the first measuring point closest to the side hole inlet, and then drive the pressure measuring port of the standard backrest tube 6 to move into the pipe; During the movement into the coal pipe 5, the pressure measuring port of the standard backrest tube 6 moves to different measuring points in the coal pipe in turn, and stays for enough measuring time. The absolute value of the difference between the measured values of the first pressure sensor 1 and the second pressure sensor 2 is the dynamic pressure value at the measuring point, and the position of each measuring point satisfies the rule of measuring the dynamic pressure at the circular cross section by the equal cross section division ring method; When the standard backrest tube 6 is inserted to the deepest part of the coal pipe 5, the controller 19 controls the translation motor 13 to drive the translation gear 11 to move, and then drive the translation gear teeth 12 on the standard backrest tube 6 to move out of the coal pipe 5. During the movement out of the coal pipe 5, the pressure measuring port of the standard backrest tube 6 moves to the same measuring points as in the entering process, and stays for enough measuring time. The dynamic pressure fluctuation of two measurements at the same measuring point does not exceed ±2%, otherwise the point should be re-measured. The arithmetic average of the dynamic pressures of the two measurements is taken as the dynamic pressure at the measuring point.

[0041] When the dynamic pressure measurements of the insertion and extraction are both completed, the controller 19 controls the translation motor 13 to drive the translation gear 11 to move the pressure measuring port of the standard backrest tube 6 out of the coal pipe 5, and switches the electromagnetic valve 7 to the closed state.

[0042] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application (such as replacing two pressure sensors with a differential pressure sensor), which should be covered within the protection scope of the claims of the present application.

Claims

1. An automatic measuring device for dynamic pressure of powder feeding pipeline based on equal cross-section ring method, characterized in that: The invention comprises a first pressure sensor (1), a second pressure sensor (2), a first electromagnetic three-way valve (3), a second electromagnetic three-way valve (4), a pulverized coal pipeline (5), a standard backrest pipe (6), an electromagnetic valve (7), a hose (16), a compressed air source (17), a data collector (18) and a controller (19); the standard backrest pipe (6) is arranged at a position to be measured on the pulverized coal pipeline (5); the standard backrest pipe (6) is connected to a steering drive mechanism and a translation drive mechanism, the steering drive mechanism is used to drive the standard backrest pipe (6) to rotate around its own axis, and the translation drive mechanism is used to drive the standard backrest pipe (6) to rotate around its own axis. ) translates along its own axis; the interface 1 of the first electromagnetic three-way valve (3) and the second electromagnetic three-way valve (4) is connected to the pressure measuring port of the standard backrest tube (6), and the interface 2 and the interface 3 of the first electromagnetic three-way valve (3) and the second electromagnetic three-way valve (4) are connected to the compressed air source (17) and the pressure sensor; the first pressure sensor (1) and the second pressure sensor (2) are connected to the input end of the data collector, and the controller (19) is connected to the first electromagnetic three-way valve (3), the second electromagnetic three-way valve (4), the electromagnetic valve, the control end of the steering drive mechanism, the control end of the translation drive mechanism and the data collector (18).

2. The automatic measuring device for dynamic pressure of powder feeding pipeline based on equal cross-section ring division method according to claim 1 is characterized in that: The standard backrest tube (6) has a cylindrical outer surface. A steering gear (9) and a translation gear (12) are provided on the outer side of the standard backrest tube (6). The steering drive mechanism comprises a steering gear (8) and a steering motor (10). The output end of the steering motor (10) is connected to the steering gear (8), and the steering gear (8) is meshed with the steering gear (9). The translation drive mechanism comprises a translation gear (11) and a translation motor (13). The output end of the translation motor (13) is connected to the translation gear (11), and the translation gear (11) is meshed with the translation gear (12).

3. The automatic dynamic pressure measuring device for powder feeding pipeline based on the equal cross-section ring division method according to claim 2 is characterized in that: A gear protection box (14) is provided outside the steering gear (8) and the translation gear (11).

4. The automatic measuring device for dynamic pressure of powder feeding pipeline based on equal cross-section ring division method according to claim 1 is characterized in that: The outer diameter of the standard backrest tube (6) is the same as the inner diameter of the solenoid valve connection port.

5. The automatic measuring device for dynamic pressure of powder feeding pipeline based on equal cross-section ring division method according to claim 1 is characterized in that: The pressure measuring port on one side of the standard backrest pipe (6) faces the incoming direction of the coal powder airflow, and the moving distance of the standard backrest pipe (6) is not less than the inner diameter of the coal powder pipeline.

6. The automatic dynamic pressure measuring device for a powder feeding pipeline based on the equal cross-section ring division method according to claim 1 is characterized in that: The cross section of the pulverized coal pipeline (5) is divided into a number of concentric rings of equal area, and the measuring points are arranged on the center lines of the equal area rings.

7. The automatic measuring device for dynamic pressure of powder feeding pipeline based on equal cross-section ring method according to claim 1 is characterized in that: A translation distance sensor and a rotation angle sensor are provided on the standard backrest tube (6), and the translation distance sensor and the rotation angle sensor are connected to the input end of the controller (19) through a data collector (18).

8. The automatic measurement method of dynamic pressure of powder delivery pipeline based on equal cross-section ring method is characterized by: The automatic measuring device for dynamic pressure of a powder feeding pipeline based on the equal cross-section ring division method according to any one of claims 1 to 7 comprises the following steps: The electromagnetic valve (7) is switched to an open state, and the controller controls the translation drive mechanism to drive the standard backrest tube (6) to move into the circular pulverized coal pipeline, and to translate the pressure measuring port of the standard backrest tube (6) to the center of the pulverized coal pipeline (5); The controller (19) controls the steering drive mechanism to drive the standard backrest tube (6) to rotate clockwise or counterclockwise until the deviation of the measured values ​​of the first pressure sensor (1) and the second pressure sensor (2) is within a set value, and the average value of the measured values ​​of the first pressure sensor (1) and the second pressure sensor (2) at this moment is used as the static pressure at the center of the circular coal powder conveying pipeline; After the static pressure measurement at the center of the pulverized coal conveying pipeline is completed, the controller (19) controls the steering drive structure to drive the standard backrest tube (6) to rotate counterclockwise or clockwise at a set angle and return to the initial position; The controller (19) controls the translation drive mechanism to drive the standard backrest tube (6) to translate its pressure measuring port to the first measuring point closest to the side wall inlet of the pulverized coal pipeline (5), and then drives the pressure measuring port of the standard backrest tube (6) to translate into the tube; During the process of moving into the circular pulverized coal pipeline, the pressure measuring port of the standard backrest pipe (6) moves to different measuring points in the pulverized coal pipeline (5) in sequence and stays there for a set time. The absolute value of the difference between the measured values ​​of the first pressure sensor (1) and the second pressure sensor (2) is the dynamic pressure value at the measuring point. When the standard backrest tube (6) is inserted into the deepest part of the pulverized coal pipeline (5), the controller (19) controls the translation drive structure to drive the standard backrest tube (6) to move toward the outside of the pulverized coal pipeline (5); During the movement toward the outside of the pulverized coal pipeline (5), the pressure measuring port of the standard backrest pipe (6) is moved to the same measuring point as during the entry process and stays there for a set time, and two measurements of insertion and withdrawal are performed. The dynamic pressures of the two measurements are arithmetic averaged as the dynamic pressure of the measuring point; After the dynamic pressure measurements of both insertion and extraction are completed, the controller (9) controls the translation drive mechanism to move the pressure measuring port of the standard backrest tube (6) out of the pulverized coal pipeline (5) and switches the solenoid valve (7) to a closed state.

9. The method for automatically measuring dynamic pressure of a powder feeding pipeline using the equal cross-section ring method according to claim 8, characterized in that: Before each measurement, under the control of the controller (19), the first electromagnetic three-way valve (3) and the second electromagnetic three-way valve (4) are switched to connect the pressure measuring port of the standard backrest tube (6) and the compressed air source (17), and the standard backrest tube (6) is cleaned. After the cleaning is completed, the first electromagnetic three-way valve (3) and the second electromagnetic three-way valve (4) are switched to connect the pressure measuring port of the standard backrest tube (6) and the pressure sensor.

10. The method for automatically measuring dynamic pressure of a powder feeding pipeline using the equal cross-section ring method according to claim 8, characterized in that: When performing two measurements of insertion and extraction, the dynamic pressure fluctuation of the two measurements at the same measuring point shall not exceed ±2%, otherwise the point should be measured again.

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