Measurement and calculation system for online analysis of performance of axial flow fan

Abstract

The invention discloses a measuring and calculating system and method for online analysis of the performance of an axial flow fan, and belongs to the technical field of environmental protection. According to the technical scheme, the measuring and calculating system for online analysis of the performance of the axial flow fan comprises a first annular pipe installed at an inlet flange of the axial flow fan, and a plurality of first measuring points are evenly distributed on the first annular pipe; the second ring pipe is mounted in front of the impeller casing, a plurality of second measuring points are uniformly distributed on the second ring pipe, and the pressure difference between the inlet of the fan and the front of the impeller casing is measured through the pressure guide pipes of the first ring pipe and the second ring pipe; through an innovative measurement and calculation mode, real-time precise monitoring of performance parameters of the axial flow fan is achieved, the air volume measurement precision is greatly improved, and the problems that traditional measurement lags behind, and devices are prone to being damaged are solved; by means of multi-component cooperation and data processing optimization, the system reliability is enhanced, visual data are provided for operators, fan operation parameters can be adjusted in time, and the fan operation efficiency is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection, and in particular relates to a measurement and calculation system for online analysis of axial flow fan performance. Background Art

[0002] Axial fans play a key role in industrial production and various engineering applications. For example, in coal-fired power plant boiler systems, axial fans are often used for forced draft fans, induced draft fans, and primary fans. They are responsible for pressurizing air into the furnace for combustion and exhausting the flue gases after combustion. The fan's operating efficiency is not only closely related to its design but also to the characteristics of the system in which it operates. Its actual operating efficiency is determined by the intersection of the fan's performance efficiency curve and the system's resistance characteristic curve.

[0003] Currently, axial flow fan performance monitoring faces numerous challenges. First, the large cross-section of the flue gas and air system ducts in thermal power plants, coupled with high dust content and the presence of components such as ammonium bisulfate, makes flow measurement devices (such as matrix flowmeters) susceptible to clogging and corrosion, severely impacting measurement accuracy and operational reliability. This makes it difficult to accurately and accurately measure the flue gas flow in real time. Second, axial flow fans are complex in structure and contain a high concentration of impurities in the operating environment. Frequent peak-shaving operations, which require frequent adjustments to the fan's operating conditions, can lead to blade wear, jamming, and damage to the blade angle adjustment components. This can cause the fan's actual performance to deviate from its designed performance, compromising operational safety and cost-effectiveness. Furthermore, traditional axial flow fan performance measurement often relies on manual operation, such as manually recording parameters such as inlet and outlet flue pressure and temperature, and then manually calculating performance indicators such as air volume and pressure. This method is inefficient, resulting in significant lags in measurement results and an inability to accurately reflect the fan's real-time operating status.

[0004] In summary, a reliable online analysis solution for axial flow fan performance is urgently needed to solve problems such as low flow measurement accuracy, easy damage of measurement devices, difficulty in monitoring fan performance deviation, and manual measurement lag, so as to achieve real-time and accurate monitoring of fan performance and ensure safe and efficient operation of the fan. Summary of the Invention

[0005] The present invention provides a measurement and calculation system for online analysis of axial flow fan performance to solve at least one of the above technical problems.

[0006] The technical solution adopted in the present invention is: A method for intelligent vehicle path recognition and target detection based on multi-threaded optimization, comprising: a first annular pipe installed at the inlet flange of the axial flow fan, wherein a plurality of first measuring points are evenly distributed on the first annular pipe and are used to measure the differential pressure at the inlet of the axial flow fan; a first annular pipe installed at the outlet flange of the axial flow fan, and a plurality of second measuring points evenly distributed on the second annular pipe for measuring the differential pressure at the outlet of the axial flow fan; an inlet pipe connected to the inlet flange of the axial flow fan; An outlet flue is connected to the outlet flange of the axial flow fan, and a temperature sensor and a pressure sensor are provided on the inlet pipe and the outlet flue; a data acquisition module, electrically connected to the first loop pipe, the second loop pipe, the temperature sensor, and the pressure sensor, for collecting data from each sensor, the first measuring point, and the second measuring point; The invention also includes a calculation module connected to the data acquisition module, and the calculation module is used to calculate the air volume of the axial flow fan according to the following formula based on the collected data: Q : ;in, K is the flow coefficient, ∆P is the differential pressure difference measured between the first and second ring pipes, ρ is the gas density calculated based on the temperature sensor and pressure sensor data.

[0007] Preferably, it also includes a Bitobar flowmeter installed on the chimney, which is used to measure the flue gas flow in the chimney to compare and correct the air volume calculated by the calculation module.

[0008] Preferably, the chimney is further provided with a performance test hole for manually measuring the flue gas parameters in the chimney, assisting in verifying the measurement data of the Bitobar flowmeter and calibrating the air volume calculation results.

[0009] Preferably, the calculation module is further configured to calculate the fan pressure according to the data of the axial flow inlet pipe and the outlet flue pressure sensor, and the calculation formula is: ,in is the fan outlet pressure, is the fan inlet pressure.

[0010] Preferably, the system further includes a current sensor connected to the motor, the current sensor being used to measure the operating current of the motor; the calculation module is further used to calculate the efficiency of the axial flow fan by combining the air volume, wind pressure and motor current, and the calculation formula is: ;in, η is the fan efficiency, U is the motor voltage, I is the motor current, is the motor power factor, is the motor efficiency.

[0011] Preferably, the first annular tube and the second annular tube are made of corrosion-resistant metal material, and their diameters are selected and adapted according to the fan model and measurement accuracy requirements.

[0012] Preferably, the data acquisition module further includes a data filtering unit for filtering the collected raw data to remove data noise interference.

[0013] Preferably, a display module is further included, which is connected to the calculation module and is used to display the performance parameters of the axial fan, such as air volume, air pressure, efficiency, etc., in real time.

[0014] A measurement and calculation method for online analysis of axial flow fan performance specifically comprises the following steps: S1, installing a first annular tube with multiple measuring points at the inlet flange of the axial flow fan, and installing a second annular tube with multiple measuring points in front of the impeller housing; S2. Install temperature sensors and pressure sensors on the inlet pipe and outlet flue; S3, collecting differential pressure data of the first loop pipe and the second loop pipe measuring points, as well as data of the temperature sensor and the pressure sensor through the data acquisition module; S4. Using the calculation module, according to the collected data, according to the formula Calculate the air volume of the axial fan. ∆P is the differential pressure measured between the first and second loop pipes, and ρ is the gas density calculated based on the data from the temperature and pressure sensors.

[0015] Preferably, the method specifically includes the following steps: Step 1: Install a Bitopa flowmeter on the chimney to measure the flue gas flow in the chimney and compare and correct the calculated air volume; Step 2: Based on the data of the inlet pipe and outlet flue pressure sensors, use the formula Calculate fan pressure; Step 3: Measure the motor working current through the current sensor connected to the motor, and combine the air volume, air pressure and motor current according to the formula Calculate the efficiency of an axial fan.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by the present invention are as follows: This technical solution addresses the technical challenges of traditional axial fan performance monitoring, including low flow measurement accuracy, fragile measurement devices, difficulty monitoring fan performance deviations, and manual measurement lag. By installing an annular tube at the axial fan's inlet flange and in front of the impeller housing, the system measures differential pressure and calculates air volume based on data from temperature and pressure sensors. A Bitobar flowmeter and performance test port are installed on the chimney to enable air volume comparison, correction, and calibration. Furthermore, the system calculates air pressure using data from inlet and outlet pressure sensors and combines this with motor current to calculate fan efficiency. The system also utilizes corrosion-resistant materials for the annular tube, incorporates a data filtering unit, and incorporates a display module to fully ensure data acquisition accuracy and system stability. This system enables real-time, precise online analysis of axial fan performance parameters, including air volume, air pressure, and efficiency. This significantly reduces air volume measurement errors, enables operators to promptly monitor fan operating status, optimize fan operation based on performance parameters, improve efficiency, reduce energy consumption, and enhance system reliability and maintainability, effectively ensuring the safe and efficient operation of axial fans in industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the instrument layout in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the inlet ring pipe structure of the fan body in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the front ring tube structure of the fan casing in a specific embodiment of the present invention; Figure 4 Schematic diagram of circular cross-section measuring points and monitoring holes in a specific embodiment of the present invention.

[0018] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] In the attached figure: 1. Inlet pipe; 2. Axial flow fan; 21. First ring pipe; 22. Second ring pipe; 23. Data acquisition module; 3. Motor; 4. Outlet flue; 5. Chimney; 51. Performance test hole; 52. Bitopa flowmeter; 6. Calculation module; 61. Display module. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "embodiment", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0024] Reference Figures 1 to 3 , a measurement and calculation system for online analysis of axial flow fan performance, comprising: A first annular pipe 21 is installed at the inlet flange of the axial flow fan 2, and a plurality of first measuring points are evenly distributed on the first annular pipe 21 for measuring the differential pressure at the inlet of the axial flow fan 2; A first annular pipe 21 is installed at the outlet flange of the axial flow fan 2, and multiple second measuring points are evenly distributed on the second annular pipe 22 for measuring the differential pressure at the outlet of the axial flow fan 2; The inlet pipe 1 is connected to the inlet flange of the axial flow fan 2; The outlet flue 4 is connected to the outlet flange of the axial flow fan 2. The inlet pipe 1 and the outlet flue 4 are both equipped with temperature sensors and pressure sensors. The data acquisition module 23 is electrically connected to the first loop pipe 21, the second loop pipe 22, the temperature sensor, and the pressure sensor, and is used to collect data from each sensor and the loop pipe measurement points; The calculation module 6 is connected to the data acquisition module 23 and is used to calculate the air volume of the axial flow fan 2 according to the following formula based on the collected data: Q : Wherein, K is the flow coefficient, ∆P is the differential pressure difference measured between the first annular tube 21 and the second annular tube 22, and ρ is the gas density calculated based on the data of the temperature sensor and the pressure sensor.

[0025] A first annular tube 21 is installed at the inlet flange of the axial flow fan 2, and multiple first measuring points are evenly distributed on this annular tube. According to the principles of fluid mechanics, when the airflow flows through the inlet flange, there are differences in flow velocity and pressure at different positions. The measuring points on the first annular tube 21 can accurately measure the pressure values ​​at these positions, and then obtain the differential pressure data at the inlet. A second annular tube 22 is installed in front of the impeller housing, and multiple second measuring points are also set up to measure the differential pressure at the outlet of the axial flow fan 2. The differential pressure data at these two locations are crucial for subsequent air volume calculations, and their difference can reflect the energy changes of the airflow in the interval from the fan inlet to the front of the impeller housing. The temperature sensor and pressure sensor installed on the inlet pipe 1 and the outlet flue 4 of the axial fan 2 can measure the temperature and pressure of the inlet pipe 1 and the outlet flue 4 in real time. The temperature sensor is based on the principle of thermal resistor or thermocouple to convert the temperature signal into an electrical signal output; the pressure sensor uses the principle of piezoresistive effect or capacitance change to accurately measure the pressure in the pipeline. The data acquisition module 23 is connected to the first ring pipe 21, the second ring pipe 22, the temperature sensor, and the pressure sensor, and is responsible for collecting data from each sensor and ring pipe measuring point. This module has a signal conditioning function, which can amplify, filter, and other processes the weak signal output by the sensor to make it meet the input requirements of the subsequent calculation module 6. The calculation module 6 is connected to the data acquisition module 23, and according to the collected data, according to the formula Calculate the air volume of axial flow fan 2. K is the flow coefficient, whose value depends on factors such as the fan structure and the location of the annular tube installation. It can be predetermined through experimental testing or theoretical calculation. ∆P is the differential pressure measured between the first annular tube 21 and the second annular tube 22. It reflects the pressure drop in a specific section of the fan and is closely related to the flow rate. ρ is the gas density, calculated using the ideal gas state equation and other formulas based on data from the temperature and pressure sensors. This formula integrates the collected differential pressure, temperature, and pressure data to achieve online calculation of the air volume of axial flow fan 2.

[0026] This application solves the problem of inaccurate air volume measurement and the inability to obtain it in real time in traditional fans. By installing a ring tube at a specific location to measure the differential pressure and combining temperature and pressure data to calculate the air volume, the measurement accuracy is significantly improved compared to traditional measurement methods. Taking a certain industrial axial flow fan 2 as an example, after adopting this solution, the air volume measurement error is reduced from the original ±10% to ±3%. At the same time, real-time online calculation of air volume is realized, and operators can obtain the air volume data of axial flow fan 2 at any time, and promptly understand the operating status of axial flow fan 2, which provides strong support for the stable operation and optimized control of axial flow fan 2.

[0027] As a preferred embodiment of the present application, it also includes a Bitobar flowmeter 52 installed on the chimney 5, which is used to measure the flue gas flow in the chimney 5 to compare and correct the air volume calculated by the calculation module 6.

[0028] The Bitopard flowmeter 52, based on the Pitot tube principle, measures the total pressure and static pressure of the fluid and calculates the fluid velocity using relevant formulas, thereby obtaining the flow rate. Installing the Bitopard flowmeter 52 on the chimney 5 measures the flue gas flow within the chimney 5. Because the flue gas flow within the chimney 5 is correlated with the air volume exhausted by the axial flow fan 2, the calculated air volume can be corrected by comparing the flue gas flow measured by the Bitopard flowmeter 52 with the air volume calculated by the calculation module 6 in the aforementioned embodiment.

[0029] If the deviation between the air volume calculated by calculation module 6 and the flue gas flow measured by Bitopard flowmeter 52 exceeds a preset threshold, it indicates that there may be an error in the air volume calculation by calculation module 6. In this case, a specific algorithm can be used to adjust the air volume calculation result of calculation module 6 based on the difference between the two. For example, if the calculated air volume is greater than the flue gas flow measured by Bitopard flowmeter 52, the flow coefficient K in calculation module 6 can be appropriately reduced and the air volume recalculated until the deviation between the two is within a reasonable range. This application further improves the accuracy of air volume measurement. In complex industrial environments, the introduction of the Bitobar flowmeter 52 provides an external reference for air volume calculations. Through comparison and correction, the impact of these factors on air volume measurement accuracy is effectively reduced. After applying this solution in the axial flow fan 2 system of a chemical company, the stability and accuracy of air volume measurement were greatly improved, providing more reliable data support for process control in chemical production.

[0030] As a preferred example of the above embodiment, a performance test hole 51 is further provided on the chimney 5 for manually measuring the flue gas parameters in the chimney 5, assisting in verifying the measurement data of the Bitopard flowmeter 52 and calibrating the air volume calculation results.

[0031] Performance test port 51 is used to manually measure flue gas parameters within chimney 5, such as temperature, pressure, and composition. Manual measurements can be performed using portable measuring instruments, such as a portable flue gas analyzer. If the Bitopard flowmeter 52 malfunctions or measures abnormal data, manual measurements can be performed through performance test port 51 to assist in verifying the accuracy of the Bitopard flowmeter's data. Manually measured data can also be used to calibrate air volume calculations. For example, manually measure the flue gas temperature and pressure at a certain location in the chimney 5 and compare them with the data measured by the Bitopard flowmeter 52. If a large deviation is found, check whether the Bitopard flowmeter 52 is loose or the sensor is damaged. If the Bitopard flowmeter 52 is normal, the manually measured data can be substituted into the air volume calculation model to optimize the parameters of the calculation module 6 to further improve the accuracy of the air volume calculation.

[0032] This technical solution enhances the reliability and maintainability of the air volume measurement system. In actual industrial applications, the measuring equipment may fail, and the setting of the performance test hole 51 provides the system with a backup measurement method. Through mutual verification between manual measurement and equipment measurement, problems in the measurement system can be discovered and solved in a timely manner, ensuring the continuous and stable operation of the axial flow fan 2 performance online analysis system. In the axial flow fan 2 monitoring system of a certain steel plant, the data of the Bitobar flowmeter 52 had abnormal fluctuations. Through manual measurement of the performance test hole 51, the cause of the flowmeter failure was quickly determined, and repairs were carried out in time, avoiding the impact of inaccurate air volume measurement on the steel production process.

[0033] As a preferred embodiment of the present application, the calculation module 6 is further used to calculate the fan pressure according to the pressure sensor data of the axial flow inlet pipe 1 and the outlet flue 4. The calculation formula is: ,in is the fan outlet pressure, is the fan inlet pressure.

[0034] Fan pressure is a key performance indicator for axial flow fans. It reflects the fan's ability to overcome pipe resistance and deliver gas. By calculating fan pressure in real time, operators can understand the fan's operating capacity under different operating conditions and determine whether the fan can meet actual production needs. For example, insufficient fan pressure in a ventilation system can lead to poor ventilation and affect the production environment; excessive fan pressure can waste energy and cause equipment wear. This technical solution enables real-time online calculation of axial fan 2's wind pressure, providing important data for axial fan 2 performance evaluation. Compared to traditional manual measurement and calculation methods, this solution can provide timely and accurate fan pressure data, enabling operators to adjust axial fan 2's operating parameters based on changes in wind pressure, ensuring efficient and stable fan operation. In the ventilation system of a large shopping mall, this solution is used to monitor axial fan 2's wind pressure in real time. The fan speed is then adjusted appropriately based on traffic flow and ventilation needs during different time periods, effectively reducing energy consumption while meeting ventilation requirements.

[0035] As a preferred embodiment of the present application, a current sensor connected to the motor 3 is further included, and the current sensor is used to measure the working current of the motor 3; the calculation module 6 is also used to calculate the efficiency of the axial flow fan 2 based on the air volume, wind pressure and the current of the motor 3. The calculation formula is: , where η is the fan efficiency, U is the voltage of motor 3, and I is the current of motor 3. is the power factor of motor 3, and ηmotor is the efficiency of motor 3.

[0036] Fan efficiency measures its ability to convert electrical energy into mechanical energy. This formula accurately calculates fan efficiency by comprehensively considering the product of the fan's output energy (air volume and air pressure) and the input energy (electrical energy consumed by Motor 3). Real-time monitoring of fan efficiency can determine whether the fan is operating in its high-efficiency range. If fan efficiency is too low, it can be improved by adjusting the fan blade angle, optimizing Motor 3 operating parameters, and other measures to achieve energy savings. This technical solution enables real-time online calculation of axial fan efficiency, providing a key basis for energy-efficient fan operation. Fans account for a significant portion of industrial energy consumption, and real-time monitoring and optimization of fan efficiency can significantly reduce energy consumption. A cement plant implemented this solution, achieving significant energy savings by reducing fan energy consumption by 15% through real-time monitoring and adjustment of fan efficiency.

[0037] Preferably, the first annular tube 21 and the second annular tube 22 are made of corrosion-resistant metal materials, and their diameters are selected and adapted according to the fan model and measurement accuracy requirements.

[0038] The first annular tube 21 and the second annular tube 22 are made of corrosion-resistant metal materials, such as stainless steel. The gas in the operating environment of the axial flow fan 2 may contain corrosive components. The use of corrosion-resistant metal materials can effectively extend the service life of the annular tube, ensuring that the annular tube will not be damaged by corrosion during long-term operation, affecting the accuracy of the differential pressure measurement. In addition, the diameter of the annular tube is adapted and selected according to the fan model and measurement accuracy requirements. For fans of different models, the parameters such as the inlet and outlet air flow rate and flow rate are different. It is necessary to select an annular tube with a suitable diameter to ensure that the annular tube measuring point can accurately measure the differential pressure. At the same time, the measurement accuracy requirements will also affect the selection of the diameter. If higher measurement accuracy is required, it may be necessary to select an annular tube with a smaller diameter and a denser distribution of measuring points.

[0039] This technical solution improves the stability and accuracy of the measurement system. By selecting suitable corrosion-resistant materials, measurement errors and equipment replacement frequency caused by corrosion in the annular pipe are reduced, thus lowering maintenance costs. The rational selection of pipe diameters enables the annular pipe measurement system to better adapt to the operating characteristics of different fans, further improving the accuracy of differential pressure measurements and laying the foundation for the subsequent accurate calculation of performance parameters such as air volume and pressure. In the axial flow fan 2 measurement system of a coastal chemical plant, corrosion-resistant stainless steel annular pipes were used. After optimizing the pipe diameter based on the fan model and measurement accuracy requirements, the system's operational stability was significantly improved, and the measurement accuracy met the stringent requirements of chemical production.

[0040] As a specific implementation of the data acquisition module 23, the data acquisition module 23 further includes a data filtering unit for filtering the collected raw data to remove data noise interference.

[0041] During actual measurement, sensor output data may be affected by factors such as electromagnetic interference and environmental noise, resulting in noise interference. The data filtering unit filters the collected raw data to remove this noise interference, making the data smoother and more accurate. For example, the mean filter algorithm averages multiple consecutive sampled data to eliminate random noise in the data; the median filter algorithm selects the middle value in the data sequence as the filtered output, effectively suppressing impulse noise. This technical solution improves the quality of data acquisition and provides more reliable data for subsequent calculation module 6. Data processed by the data filtering unit more accurately reflects fan operating parameters, reducing calculation errors caused by data noise. In a monitoring system for axial flow fans 2 in an electronic equipment production workshop, the application of the data filtering unit significantly reduced fluctuations in parameters such as air volume and air pressure obtained by calculation module 6, improving the accuracy and reliability of fan performance analysis.

[0042] Preferably, the system further includes a display module 61, which is connected to the calculation module 6 and is used to display performance parameters of the axial flow fan 2, such as air volume, air pressure, and efficiency, in real time. The display module 61 can be in the form of a liquid crystal display, an LED display, or the like. The calculation module 6 transmits the calculated performance parameters of the axial flow fan 2, such as air volume, air pressure, and efficiency, to the display module 61, which then displays these parameters in real time in the form of intuitive numbers, charts, or the like. For example, by displaying parameters such as air volume, air pressure, and efficiency in the form of a bar graph, a broken line graph, or the like, an operator can clearly understand the changing trends of various performance parameters of the fan. This technical solution allows operators to intuitively understand the fan's operating status, improving operational convenience. Operators can access the fan's key performance parameters in real time on display module 61 without having to perform complex calculations or query data records. This facilitates the timely detection of abnormalities in fan operation and the implementation of appropriate measures. In a building's ventilation system, after installing display module 61, property management personnel can quickly understand the fan's operating status, conduct timely maintenance and management of the fan, and ensure a good ventilation environment within the building.

[0043] A method for measuring and calculating the performance of an axial flow fan for online analysis comprises the following steps: S1. Install a first annular tube 21 with multiple measuring points at the inlet flange of the axial flow fan 2, and install a second annular tube 22 with multiple measuring points in front of the impeller housing; S2. Install temperature sensors and pressure sensors on the inlet pipe 1 and the outlet flue 4; S3, collecting differential pressure data of the first loop pipe 21 and the second loop pipe 22 measuring points, as well as data of the temperature sensor and the pressure sensor through the data acquisition module 23; S4, using calculation module 6, according to the collected data, according to the formula Calculate the air volume of the axial flow fan 2, where ∆P is the differential pressure difference measured between the first annular tube 21 and the second annular tube 22, and ρ is the gas density calculated based on the data from the temperature sensor and the pressure sensor.

[0044] This technical solution achieves online measurement and calculation of the air volume of axial flow fan 2 through a series of steps, resolving the issues of delayed and inaccurate manual air volume measurement. For example, in a mine ventilation system, this method enabled real-time monitoring of fan air volume changes, enabling timely adjustments to ventilation strategies and ensuring ventilation safety underground. Compared to traditional measurement methods, measurement time was reduced from 2-3 hours per measurement to real-time measurement, significantly improving measurement accuracy.

[0045] A method for measuring and calculating the performance of an axial flow fan for online analysis further comprises the following steps: Step 1: Install a Bitopard flowmeter 52 on the chimney 5 to measure the flue gas flow in the chimney 5 and compare and correct the calculated air volume; Step 2: Based on the pressure sensor data of inlet pipe 1 and outlet flue 4, use the formula Calculate fan pressure; Step 3: Measure the working current of motor 3 through the current sensor connected to motor 3, and calculate the working current of motor 3 according to the formula based on the wind volume, wind pressure and motor 3 current. Calculate the efficiency of axial fan 2.

[0046] This technical solution integrates multiple measurement and calculation steps to fully implement online measurement, calculation, and correction of axial fan 2 performance parameters such as air volume, air pressure, and efficiency, providing a complete solution for fan performance evaluation and energy-saving operation. After implementing this solution in a thermal power plant's axial fan 2 system, real-time monitoring and optimization of fan performance parameters increased fan operating efficiency by over 10%, effectively reducing energy consumption while ensuring stable operation of the thermal power plant.

[0047] Anything not described in the present invention can be achieved by adopting or drawing on existing technologies.

[0048] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0049] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A method for intelligent vehicle path recognition and target detection based on multi-threaded optimization, characterized in that: include: A first annular pipe is installed at the inlet flange of the axial flow fan, and a plurality of first measuring points are evenly distributed on the first annular pipe; A first annular pipe is installed at the outlet flange of the axial flow fan, and a plurality of second measuring points are evenly distributed on the second annular pipe; an inlet pipe connected to the inlet flange of the axial flow fan; An outlet flue is connected to the outlet flange of the axial flow fan, and a temperature sensor and a pressure sensor are provided on the inlet pipe and the outlet flue; a data acquisition module, electrically connected to the first loop pipe, the second loop pipe, the temperature sensor, and the pressure sensor, for collecting data from each sensor, the first measuring point, and the second measuring point; The system further includes a calculation module connected to the data acquisition module, and the calculation module is used to calculate the air volume Q of the axial flow fan according to the following formula based on the collected data: ;in, K is the flow coefficient, ∆P is the differential pressure difference measured between the first and second ring pipes, ρ is the gas density calculated based on the temperature sensor and pressure sensor data.

2. The measurement and calculation system for online analysis of axial flow fan performance according to claim 1, characterized in that: It also includes a Bitobar flowmeter installed on the chimney, which is used to measure the flue gas flow in the chimney to compare and correct the air volume calculated by the calculation module.

3. The measurement and calculation system for online analysis of axial flow fan performance according to claim 2, characterized in that: The chimney is also provided with a performance test hole for manually measuring the flue gas parameters in the chimney, assisting in verifying the measurement data of the Bitobar flowmeter and calibrating the air volume calculation results.

4. The measurement and calculation system for online analysis of axial flow fan performance according to claim 1, characterized in that: The calculation module is also used to calculate the fan pressure based on the data of the axial flow inlet pipe and outlet flue pressure sensor. The calculation formula is: ,in is the fan outlet pressure, is the fan inlet pressure.

5. The measurement and calculation system for online analysis of axial flow fan performance according to claim 4, characterized in that: It also includes a current sensor connected to the motor, the current sensor is used to measure the working current of the motor; the calculation module is also used to calculate the efficiency of the axial flow fan by combining the air volume, wind pressure and motor current, and the calculation formula is: ;in, η is the fan efficiency, U is the motor voltage, I is the motor current, is the motor power factor, is the motor efficiency.

6. The measurement and calculation system for online analysis of axial flow fan performance according to claim 1, characterized in that: The first annular tube and the second annular tube are made of corrosion-resistant metal materials, and their diameters are selected and adapted according to the fan model and measurement accuracy requirements.

7. The measurement and calculation system for online analysis of axial flow fan performance according to claim 2, characterized in that: The data acquisition module also includes a data filtering unit for filtering the collected raw data to remove data noise interference.

8. The measurement and calculation system for online analysis of axial flow fan performance according to claim 1, characterized in that: It also includes a display module, which is connected to the calculation module and is used to display the performance parameters of the axial flow fan, such as air volume, air pressure, efficiency, etc. in real time.

9. A measurement and calculation method for online analysis of axial flow fan performance, characterized in that: The specific steps include: S1. Install a first annular tube with multiple measuring points at the inlet flange of the axial flow fan, and install a second annular tube with multiple measuring points in front of the impeller housing; S2. Install temperature sensors and pressure sensors on the inlet pipe and outlet flue; S3, collecting differential pressure data of the first loop pipe and the second loop pipe measuring points, as well as data of the temperature sensor and the pressure sensor through the data acquisition module; S4. Using the calculation module, according to the collected data, according to the formula Calculate the air volume of the axial fan. ∆P is the differential pressure measured between the first and second loop pipes, and ρ is the gas density calculated based on the data from the temperature and pressure sensors.

10. The method for measuring and calculating the performance of an axial flow fan for online analysis according to claim 9, characterized in that: The specific steps include: Step 1: Install a Bitopa flowmeter on the chimney to measure the flue gas flow in the chimney and compare and correct the calculated air volume; Step 2: Based on the data of the inlet pipe and outlet flue pressure sensors, use the formula Calculate fan pressure; Step 3: Measure the motor working current through the current sensor connected to the motor, and combine the air volume, air pressure and motor current according to the formula Calculate the efficiency of an axial fan.

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