Online monitoring system and method for energy consumption of induced draft fan unit

Abstract

The invention provides an induced draft fan unit energy consumption online monitoring system and method, and belongs to the technical field of fan energy consumption monitoring. The online energy consumption monitoring system for the induced draft fan unit comprises a negative pressure sensor, a temperature sensor, a three-axis acceleration sensor and an industrial personal computer, and the temperature sensor and the negative pressure sensor are installed at an inlet of a fan. The negative pressure sensor and the temperature sensor are installed at the inlet of the fan to monitor temperature data and air pressure data at the inlet of the fan in real time, the industrial personal computer can collect the temperature data and the air pressure data generated by the negative pressure sensor and the temperature sensor, and then the data can be stored; therefore, the energy consumption condition of the motor can be detected according to the temperature data, the air pressure data and the data generated by the vibration signal, the actual energy consumption data is compared with the standard energy consumption data, the corresponding part of the fan can be maintained according to the difference value, and the energy consumption of the fan can be reduced.

Description

Technical Field

[0001] The present application relates to the field of fan energy consumption monitoring, and more specifically, to an online monitoring system and method for energy consumption of an induced draft fan unit. Background Art

[0002] Fans, motors, pumps, and compressors are collectively referred to as "industrial motor systems" by the International Energy Agency (IEA). The National Development and Reform Commission's "Eleventh Five-Year" Energy Conservation Plan points out that industrial motor systems are the main electricity users in China, accounting for more than 50% of the total electricity consumption, of which fans account for 10.4% of the national electricity consumption. Therefore, improving fan efficiency is of great significance to saving electricity. Fan systems are large in quantity and wide in scope, and have great potential for saving electricity. The introduction of the national standard "Energy Efficiency Limit Values ​​and Energy Efficiency Grades for Ventilators" stipulates the energy efficiency grades, energy efficiency limit values, energy-saving evaluation values, and test methods for ventilators, providing a basis for the research and development of energy efficiency work for high-efficiency fans in my country. It also marks the beginning of energy efficiency labeling work for high-efficiency fans in my country. On November 1, 2010, fans will be officially included in the catalog of products that implement energy efficiency labeling in the People's Republic of China (the sixth batch), and implementation has begun. Fans are very important equipment in metallurgical production processes. They are widely used, in large quantities, and have high energy consumption. They are used in various areas such as ironmaking, coking, steelmaking, rolling, chemical industry and power plants. Their power consumption accounts for about 40% of the total power consumption of Baoshan Branch. Since the motor power of dust removal fans, induced draft fans, blowers and other motors in the metallurgical industry is generally large, the energy saving is very considerable, and the fan energy-saving transformation project has also become an important business segment of various energy-saving and environmental protection companies. Energy-saving transformation refers to replacing the original fan with a new high-efficiency fan as a whole or replacing a more efficient impeller on the basis of the original fan, and the original fan pipe network system can be left unchanged. After the fan is energy-saving transformed, the system operating point is within the optimal working range of the fan, which is a very effective way to save energy, with an energy saving rate of between 20% and 30%. However, after long-term continuous operation, the fan efficiency decreases year by year due to wear, corrosion, impeller deformation, increased pipe resistance and changes in production process. That is, the energy-saving effect of the fan will also decrease year by year. How to grasp the energy-saving status of the fan in real time and take measures in advance to keep the fan in a better energy-saving state is difficult to achieve by conventional equipment maintenance methods.

[0003] The induced draft fan is one of the important auxiliary equipment in thermal power plants. It removes the high-temperature flue gas generated by furnace combustion, maintains furnace pressure, and forms flue gas flow. Due to the long-term operation of the boiler, the boiler resistance increases, resulting in an increase in the unit's power consumption rate. The power consumption of the boiler induced draft fan accounts for about 60% of the total power consumption of the wind and smoke system. Therefore, improving the operating efficiency of the fan plays an important role in energy saving and consumption reduction. Summary of the invention

[0004] In order to make up for the above deficiencies, the present application provides an online monitoring system and method for energy consumption of an induced draft fan unit, aiming to improve the problem of high energy consumption of the induced draft fan.

[0005] In the first aspect, an embodiment of the present application provides an online monitoring system for energy consumption of an induced draft fan unit, including a negative pressure sensor, a temperature sensor, a three-axis acceleration sensor, and an industrial computer. The temperature sensor and the negative pressure sensor are installed at the inlet of the fan to monitor the temperature at the inlet of the fan and produce temperature data, as well as to monitor the air pressure at the inlet of the fan and produce air pressure data at the same time. The three-axis acceleration sensor, the negative pressure sensor, the temperature sensor, and the three-axis acceleration sensor are all electrically connected to the industrial computer.

[0006] In a specific embodiment, a flue monitoring device is further included, wherein the flue monitoring device is electrically connected to the industrial control machine and is installed in the flue to monitor internal blockage conditions.

[0007] In a specific implementation, it also includes an electric power meter, which is connected to the electrical switch of the fan electric control cabinet and is also connected to the industrial computer to monitor the motor power of the fan.

[0008] In a specific implementation, the three-axis acceleration sensor is respectively installed on the housing of the fan, the housing of the motor and the bearing housing to obtain vibration signals of three test points.

[0009] In a specific implementation manner, a data collector is further provided in the monitoring system, and the data collector receives data generated by the negative pressure sensor, the temperature sensor and the three-axis acceleration sensor.

[0010] In a specific embodiment, the monitoring system also includes a first A / D converter, a second A / D converter and a third A / D converter, the first A / D converter is connected to the output end of the negative pressure sensor, the second A / D converter is connected to the output end of the temperature sensor, and the third A / D converter is connected to the output end of the three-axis acceleration sensor.

[0011] In a second aspect, an online monitoring method for energy consumption of an induced draft fan unit is provided, comprising:

[0012] The above-mentioned induced draft fan unit energy consumption online monitoring system; and the following steps:

[0013] S1. Build an energy consumption monitoring and management platform, set up a database server, and connect the industrial computer to the database server so that the industrial computer stores the collected data in the database server;

[0014] S2, data acquisition, the negative pressure sensor detects the pressure data at the fan inlet, the temperature sensor detects the temperature data at the fan inlet, the three-axis acceleration sensor detects the fan vibration data, and the industrial computer collects and generates pressure data, temperature data and vibration data;

[0015] S3, data storage, the industrial computer collects pressure data, temperature data and vibration data, and stores them in the database server, and calculates the energy consumption status of the fan according to the collected data and the real-time active power of the fan detected by the power meter;

[0016] S4, data collation, the industrial computer transmits the fan energy consumption status data to the display for display.

[0017] In a specific implementation manner, in the step S1, the industrial computer detects the internal condition of the flue through the flue monitoring device to detect the blockage condition of the flue in real time.

[0018] In a specific implementation manner, in step S3, the actual energy consumption status of the fan is compared with the energy consumption status under the standard state to obtain the actual energy consumption increase status of the fan.

[0019] In a specific implementation manner, in the step S4, the corresponding parts of the fan are maintained and repaired according to the information displayed on the display to reduce the energy consumption of the fan.

[0020] The beneficial effects of the present application are as follows: by installing a negative pressure sensor and a temperature sensor at the inlet of the fan, the temperature data and air pressure data at the inlet of the fan can be monitored in real time, and the industrial computer can collect the temperature data and air pressure data generated by the negative pressure sensor and the temperature sensor, and then store the data. In addition, a three-axis acceleration sensor is provided, and the three-axis acceleration sensor is installed on the casing of the fan, the casing of the motor and the bearing seat to detect the three-point vibration signal of the fan, and then the energy consumption status of the motor can be detected according to the temperature data, air pressure data and the data generated by the vibration signal, and the actual energy consumption data can be compared with the standard energy consumption data, and then the corresponding parts of the fan can be maintained according to the difference, which helps to reduce the energy consumption of the fan. In addition, a flue monitoring device is installed in the flue, which can monitor the blockage status in the flue in real time, so as to clean the inside of the flue in time and ensure air circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural block diagram of an online monitoring system and method for energy consumption of an induced draft fan unit provided in an embodiment of the present application;

[0023] Figure 2 A flow chart of an online monitoring system and method for energy consumption of an induced draft fan unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0025] See also Figure 1-2 The present application provides an online monitoring system for energy consumption of an induced draft fan unit, including a negative pressure sensor, a temperature sensor, a three-axis acceleration sensor, and an industrial computer. The industrial computer is connected to an existing display, so that data information can be transmitted to the display through the industrial computer, so as to obtain the detection data. The temperature sensor and the negative pressure sensor are installed at the inlet of the fan to monitor the temperature at the inlet of the fan and produce temperature data. By detecting the temperature at the inlet of the fan, the influence of the temperature on the energy consumption of the fan can be detected, and the air pressure at the inlet of the fan can be monitored and air pressure data can be produced at the same time. By detecting the air pressure data at the fan outlet, the influence of the air pressure on the energy consumption of the fan can be detected. The three-axis acceleration sensor, the negative pressure sensor, the temperature sensor and the three-axis acceleration sensor are all electrically connected to the industrial computer.

[0026] It also includes a flue monitoring device, which is electrically connected to the industrial computer and installed in the flue to monitor the internal blockage condition. Specifically, the flue monitoring device includes a camera device and a display device. The industrial computer receives the monitoring image transmitted by the camera device, so that the industrial computer transmits the acquired monitoring image to the display device, so as to monitor the internal condition of the flue in real time and clean the inside of the flue in time.

[0027] It also includes an electric meter, which is connected to the electrical switch of the fan electric control cabinet and is connected to the industrial computer to monitor the motor power of the fan. The electric meter can monitor the power of the fan in real time, so as to obtain the energy consumption status of the fan, compare the actual energy consumption status with the standard energy consumption status, so as to obtain the energy consumption increase information of the fan, and then facilitate the maintenance of the fan according to the energy consumption increase information.

[0028] The three-axis acceleration sensors are respectively installed on the fan casing, the motor casing and the bearing housing to obtain the vibration signals of the three test points. By obtaining the vibration signals of the three test points and passing through the signal processing and feature extraction modules, the influence of the vibration state on the fan can be obtained, thereby obtaining the energy consumption status.

[0029] The monitoring system is also provided with a data collector, which receives data generated by the negative pressure sensor, the temperature sensor and the three-axis acceleration sensor. There are several data collectors, which collect temperature data, air pressure data and vibration data respectively.

[0030] The monitoring system also includes a first A / D converter, a second A / D converter and a third A / D converter. The first A / D converter is connected to the output end of the negative pressure sensor, and the first A / D converter converts the acquired air negative pressure data into a digital signal for transmission. The second A / D converter is connected to the output end of the temperature sensor, and the second A / D converter converts the acquired temperature data into digital information for transmission. The third A / D converter is connected to the output end of the three-axis acceleration sensor, and the third A / D converter converts the acquired vibration signal data into a digital signal for transmission.

[0031] A method for online monitoring of energy consumption of an induced draft fan unit, comprising:

[0032] The above-mentioned induced draft fan unit energy consumption online monitoring system; and the following steps:

[0033] S1. Build an energy consumption monitoring management platform, set up a database server, connect the industrial computer to the database server, so that the industrial computer stores the collected data in the database server, and set up multiple stack tables in the database server database to store temperature data, air negative pressure data and vibration signal data separately;

[0034] S2, data collection, the negative pressure sensor detects the pressure data at the fan inlet, the temperature sensor detects the temperature data at the fan inlet, the three-axis acceleration sensor detects the fan vibration data, the industrial computer collects the generated pressure data, temperature data and vibration data, and the collected data is stored in the database server;

[0035] S3, data storage, the industrial computer collects pressure data, temperature data and vibration data, and stores them in the database server, calculates the energy consumption of the fan based on the collected data and the real-time active power of the fan detected by the power meter, and compares it with the energy consumption of the fan under standard conditions to obtain the actual energy consumption increase data of the fan, and performs maintenance on the corresponding parts of the fan based on the data;

[0036] S4. Data collation: the industrial computer transmits the fan energy consumption status data to the display for display.

[0037] In step S1, the industrial computer detects the internal condition of the flue through the flue monitoring device, which is used to detect the blockage condition inside the flue in real time, so as to clean the inside of the flue in time and ensure the normal circulation of air.

[0038] In step S3, the actual energy consumption status of the fan is compared with the energy consumption status under the standard state to obtain the actual energy consumption increase status of the fan, and corresponding maintenance processing is performed according to the energy consumption increase data of the fan.

[0039] In step S4, maintenance and repair are performed on corresponding parts of the fan according to the information displayed on the display to reduce the energy consumption of the fan.

[0040] It should be noted that the specific model and specifications of the industrial computer need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0041] The power supply and principle of the industrial computer are clear to those skilled in the art and will not be described in detail here.

[0042] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. An online monitoring system for energy consumption of an induced draft fan unit, characterized in that: It includes a negative pressure sensor, a temperature sensor, a three-axis acceleration sensor, and an industrial computer. The temperature sensor and the negative pressure sensor are installed at the inlet of the fan to monitor the temperature at the inlet of the fan and produce temperature data, and monitor the air pressure at the inlet of the fan and produce air pressure data at the same time. The three-axis acceleration sensor, the negative pressure sensor, the temperature sensor, and the three-axis acceleration sensor are all electrically connected to the industrial computer.

2. The online monitoring system for energy consumption of an induced draft fan unit according to claim 1 is characterized in that: It also includes a flue monitoring device, which is electrically connected to the industrial control machine and is installed in the flue to monitor the internal blockage condition.

3. The online monitoring system for energy consumption of an induced draft fan unit according to claim 2 is characterized in that: It also includes an electric power meter, which is connected to the electrical switch of the fan electric control cabinet and is also connected to the industrial computer to monitor the motor power of the fan.

4. The online monitoring system for energy consumption of an induced draft fan unit according to claim 1 is characterized in that: The three-axis acceleration sensor is respectively installed on the housing of the fan, the housing of the motor and the bearing seat shell to obtain vibration signals of three test points.

5. The on-line monitoring system for energy consumption of induced draft fan unit according to claim 4 is characterized in that: The monitoring system is also provided with a data collector, which receives data generated by the negative pressure sensor, the temperature sensor and the three-axis acceleration sensor.

6. The on-line monitoring system and method for energy consumption of an induced draft fan unit according to claim 4, characterized in that: The monitoring system also includes a first A / D converter, a second A / D converter and a third A / D converter. The first A / D converter is connected to the output end of the negative pressure sensor, the second A / D converter is connected to the output end of the temperature sensor, and the third A / D converter is connected to the output end of the three-axis acceleration sensor.

7. A method for online monitoring of energy consumption of an induced draft fan unit, characterized in that: include The online monitoring system for energy consumption of an induced draft fan unit according to any one of claims 1 to 6; and the following steps: S1. Build an energy consumption monitoring and management platform, set up a database server, and connect the industrial computer to the database server so that the industrial computer stores the collected data in the database server; S2, data acquisition, the negative pressure sensor detects the pressure data at the fan inlet, the temperature sensor detects the temperature data at the fan inlet, the three-axis acceleration sensor detects the fan vibration data, and the industrial computer collects and generates pressure data, temperature data and vibration data; S3, data storage, the industrial computer collects pressure data, temperature data and vibration data, and stores them in the database server, and calculates the energy consumption status of the fan according to the collected data and the real-time active power of the fan detected by the power meter; S4, data sorting, the industrial computer transmits the fan energy consumption status data to the display for display.

8. The method for online monitoring of energy consumption of an induced draft fan unit according to claim 7, characterized in that: In the step S1, the industrial computer detects the internal condition of the flue through the flue monitoring device, so as to detect the blockage condition of the flue in real time.

9. The method for online monitoring of energy consumption of an induced draft fan unit according to claim 7, characterized in that: In step S3, the actual energy consumption status of the fan is compared with the energy consumption status under the standard state to obtain the actual energy consumption increase status of the fan.

10. The method for online monitoring of energy consumption of an induced draft fan unit according to claim 7, characterized in that: In the step S4, the corresponding parts of the fan are maintained and repaired according to the information displayed on the display to reduce the energy consumption of the fan.

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