Intelligent control system for tertiary air of rotary kiln based on multi-parameter fusion

Abstract

The utility model discloses a kind of rotary kiln tertiary air intelligent regulation and control system based on multi-parameter fusion, including fan and PLC controller, the fan is connected air supply pipe, flow regulator is installed in the air supply pipe, the PLC controller is electrically connected with frequency converter, the frequency converter is electrically connected with fan, the PLC controller is electrically connected with temperature sensor, pressure sensor, oxygen content sensor;Power of fan can be changed based on the parameter of rotary kiln by PLC controller and frequency converter, realize the accurate control to air volume, adjustment is more delicate and flexible, reduce the burning loss rate of rotary kiln. Significantly improve combustion efficiency, while reducing energy consumption and pollutant emission, through oxygen content sensor, pressure sensor, temperature sensor, material level meter acquisition oxygen content, pressure, temperature, material level data, realize the overall regulation and control to kiln environment, and then improve the accuracy and reliability of fan adjustment.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a rotary kiln tertiary air intelligent control system based on multi-parameter fusion. Background Technology

[0002] Current RKEF rotary kilns are typically equipped with primary, secondary, and tertiary air systems. The tertiary air fan delivers tertiary air through a ventilation duct extending near the centerline of the kiln shell. The tertiary air velocity needs to be adjusted appropriately based on parameters such as temperature, oxygen content, and the condition of the material inside the kiln. However, currently, the control of the tertiary air mainly relies on the operator's experience, lacking precision. If the tertiary air fan's output is too large, it will lead to increased energy consumption, excessive flame elongation, and reduced flame temperature. Conversely, if the output is too small, combustible gases may not burn completely or the combustion initiation time may be delayed, requiring large amounts of coal or metallurgical coke and electricity. Simultaneously, it will increase smelting temperature, exacerbate gas and dust pollution, and cause localized overheating and kiln caking. Utility Model Content

[0003] The purpose of this invention is to provide a rotary kiln tertiary air intelligent control system based on multi-parameter fusion to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rotary kiln tertiary air intelligent control system based on multi-parameter fusion, including a blower connected to an air supply pipe, a flow regulator installed inside the air supply pipe to adjust the air speed, two clamping frames installed on the blower, a filter plate slidably connected inside the clamping frames, two brush strips rotatably connected to the clamping frames, and a rotating handle rotatably connected to the brush strips. The filter plate can filter some large particles of impurities, and rotating the brush strips can clean the filter plate.

[0005] A PLC controller is electrically connected to a frequency converter, which is electrically connected to a fan.

[0006] The PLC controller is electrically connected to a temperature sensor, a pressure sensor, and an oxygen content sensor. Based on the temperature, pressure, and oxygen content data, the PLC controller adjusts the fan speed, significantly improving combustion efficiency.

[0007] Furthermore, the air supply duct is connected to a rotary kiln, and the temperature sensor, pressure sensor, and oxygen content sensor are installed on the rotary kiln. A data acquisition device is connected between the PLC controller and the temperature sensor, pressure sensor, and oxygen content sensor. A level gauge is installed on the rotary kiln, and the level gauge is electrically connected to the data acquisition device. It can detect temperature, pressure, oxygen content, and level data for easy viewing.

[0008] Furthermore, the flow regulator includes an electric cylinder and a baffle rotatably connected to the electric cylinder. The baffle is rotatably connected to the air duct. The electric cylinder and the baffle are respectively rotatably connected to a fixed seat and a fixed shaft. The fixed seat and the fixed shaft are connected to the air duct. The air duct is provided with an inspection port. An inspection cover is installed on the air duct to block the inspection port, so as to facilitate maintenance of the electric cylinder and the baffle.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] (1) By using a PLC controller and frequency converter, the fan power can be changed based on the parameters of the rotary kiln, thereby achieving precise control of the air volume, making the adjustment more refined and flexible, and reducing the burn-off rate of the rotary kiln. This significantly improves combustion efficiency while reducing energy consumption and pollutant emissions.

[0011] (2) By collecting oxygen content, pressure, temperature and material level data through oxygen content sensor, pressure sensor, temperature sensor and material level gauge, the kiln environment can be fully controlled, thereby improving the accuracy and reliability of blower regulation.

[0012] (3) By controlling the rotation of the baffle by pushing and pulling the electric cylinder, the wind speed can be adjusted without increasing the power of the fan, which can save energy and realize secondary control of wind speed and air volume to meet flexible adjustment needs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the control system of this utility model;

[0014] Figure 2 This is a schematic diagram of the interior of the air supply duct of this utility model;

[0015] Figure 3 This is a schematic diagram of the baffle rotating according to the present invention;

[0016] Figure 4 This is a schematic diagram of the connection between the fan and the filter plate of this utility model.

[0017] In the diagram: 1. Rotary kiln; 2. Air duct; 3. Inspection cover; 4. Fan; 5. Frequency converter; 6. PLC controller; 7. Data acquisition unit; 8. Oxygen content sensor; 9. Pressure sensor; 10. Temperature sensor; 11. Level gauge; 12. Inspection port; 13. Mounting base; 14. Electric cylinder; 15. Baffle; 16. Mounting shaft; 17. Frame; 18. Filter plate; 19. Brush strip; 20. Rotary handle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example:

[0020] Please see Figure 1-3 This utility model provides a technical solution: a rotary kiln tertiary air intelligent control system based on multi-parameter fusion, including a blower 4, the blower 4 being connected to an air supply pipe 2, the air supply pipe 2 having a flow regulator installed inside, the blower 4 supplying air to the rotary kiln 1 through the air supply pipe 2, the flow regulator being able to change the wind speed and flow rate, two clamping frames 17 being installed on the blower 4, a filter plate 18 being slidably connected inside the clamping frame 17, two brush strips 19 being rotatably connected to the clamping frame 17, and a rotating handle 20 being rotatably connected to the brush strips 19, the filter plate 18 being able to slide between the two clamping frames 17, when the filter plate 18 is partially blocked by dust, the filter plate 18 can be pulled to align the dust-free part with the air inlet of the blower 4 without removing the filter plate 18, the brush strips 19 can be rotated by holding the rotating handle 20, the bristles on the brush strips 19 can clean the filter plate 18, achieving rapid dust removal;

[0021] PLC controller 6, which is electrically connected to frequency converter 5, and frequency converter 5 is electrically connected to fan 4. The PLC controller sends a speed control signal corresponding to the calculated optimal air volume to frequency converter 5. After receiving the signal, frequency converter 5 adjusts the speed of fan 4 in real time, thereby accurately changing the air volume of fan 4, realizing precise and continuous control of air force, and ensuring the efficient, environmentally friendly and stable operation of rotary kiln 1.

[0022] The PLC controller 6 is electrically connected to a temperature sensor 10, a pressure sensor 9, and an oxygen content sensor 8, enabling the detection of temperature, pressure, and oxygen content in the rotary kiln 1, and providing data support for the control of the blower 4. The temperature sensor 10 is a thermocouple. When the two thermoelectrodes of the thermocouple are made of different materials and the temperatures at both ends are different, a thermoelectric potential will be generated in the circuit. The thermocouple is an S-type (platinum-rhodium 10-platinum) thermocouple with a measurement range of approximately 0℃ to 1600℃ and an accuracy of ±1.5℃.

[0023] The pressure sensor 9 is a piezoresistive pressure sensor: utilizing the piezoresistive effect of single-crystal silicon, it converts pressure changes into changes in resistance, and then into an electrical signal output. It has advantages such as high measurement accuracy, good stability, high frequency response, simple structure, and small size.

[0024] The oxygen content sensor 8 employs an optical oxygen sensor: it measures the partial pressure of oxygen using the principle of light quenching. When oxygen molecules interact with a fluorescent substance on the sensor surface, the luminescence intensity or lifetime of the fluorescent substance changes, and the oxygen content is determined by detecting these changes. This sensor features low power consumption, long lifespan, and requires no signal conditioning circuitry.

[0025] In this embodiment, the air supply pipe 2 is connected to the rotary kiln 1, the temperature sensor 10, the pressure sensor 9, and the oxygen content sensor 8 are installed on the rotary kiln 1 to detect the internal data of the rotary kiln 1, the PLC controller 6 is connected to the temperature sensor 10, the pressure sensor 9, and the oxygen content sensor 8 by a data acquisition device 7, and a level gauge 11 is installed on the rotary kiln 1, and the level gauge 11 is electrically connected to the data acquisition device 7;

[0026] The level gauge 11 adopts a radar level gauge 11: it realizes level measurement by emitting high-frequency electromagnetic waves and calculating their reflection time difference, and converts the distance signal into a 4-20mA current signal or other standardized output;

[0027] The data acquisition unit 7 acquires signals from the oxygen content sensor 8, pressure sensor 9, temperature sensor 10, and level gauge 11 through the sensor interface, then performs signal conditioning, and then performs analog-to-digital conversion (A / D conversion). Finally, the acquired data is transmitted to the host PLC controller 6 for further processing and analysis.

[0028] In this embodiment, as Figure 2 As shown, the flow regulator includes an electric cylinder 14 and a baffle 15 rotatably connected to the electric cylinder 14. The baffle 15 is rotatably connected to the air duct. The electric cylinder 14 and the baffle 15 are respectively rotatably connected to a fixed seat 13 and a fixed shaft 16. The fixed seat 13 and the fixed shaft 16 are connected to the air duct. The electric cylinder 14 pushes and pulls the baffle 15 to rotate, changing the degree of obstruction of the baffle 15 on the air supply duct 2, thereby adjusting the air volume and air speed.

[0029] In this embodiment, as Figure 2 As shown, the air supply pipe 2 is provided with an inspection port 12, and an inspection cover 3 is installed on the air supply pipe 2 to block the inspection port 12. The inspection cover 3 is connected to the air supply pipe 2 by screws. The electric cylinder 14 and the baffle 15 can be adjusted by removing the inspection cover 3.

[0030] Specifically, during use, the temperature sensor 10 is placed at key locations in the rotary kiln 1, such as the kiln head, kiln tail, and different areas inside the kiln (near the air inlet, etc.), to monitor the temperature distribution inside the kiln in real time. The pressure sensor 9 measures the pressure inside the kiln and the pressure changes during the air conveying process. The oxygen content sensor 8 is placed inside the rotary kiln 1 to detect the oxygen concentration inside the kiln in real time, so as to understand the oxygen supply during the combustion process. The level gauge 11 is connected to the rotary kiln 1 to detect the material level.

[0031] The output terminals of temperature sensor 10, pressure sensor 9, and oxygen content sensor 8 are connected to the input terminal of data acquisition device 7. Data acquisition device 7 is connected to the input interface of PLC controller 6 via a communication network to realize the real-time acquisition and transmission of key parameters in rotary kiln 1.

[0032] The output interface of PLC controller 6 is connected to the control port of inverter 5 through a communication network. PLC controller 6 sends speed regulation commands to inverter 5 according to the preset control algorithm and the received parameter signals.

[0033] The output of the frequency converter 5 is connected to the input of the fan 4 to control the speed of the fan 4 and thus adjust the air volume.

[0034] The PLC controller 6, as the core control unit of the system, is responsible for receiving signals from the oxygen content sensor 8, pressure sensor 9, and temperature sensor 10, running the control algorithm, and outputting control commands. The frequency converter 5 is connected to the fan 4, and adjusts the speed of the fan 4 according to the signals from the PLC controller 6 to achieve precise airflow control. Common types include vector frequency converters or direct torque control frequency converters, which can meet the speed adjustment requirements of the fan 4.

[0035] Temperature sensors 10 are arranged at different positions in rotary kiln 1 to acquire temperature data of each area in the kiln in real time. PLC controller 6 receives these temperature signals and compares them with the set temperature range. If the temperature in a certain area of ​​the kiln is too high, PLC controller 6 determines that the air volume is too large, resulting in an excessively long flame and uneven temperature distribution. At this time, it controls frequency converter 5 to reduce the speed of fan 4 and reduce the air volume. Conversely, if the temperature is too low and the upward trend is slow, the combustion is incomplete. It is necessary to appropriately increase the air volume to raise the temperature in the kiln and make the material in a suitable temperature environment for heating and melting.

[0036] Pressure sensor 9 monitors the pressure inside the kiln. When abnormal fluctuations occur in the pressure inside the kiln, such as excessively high pressure which may affect gas flow and combustion process, PLC controller 6 analyzes and judges the pressure data in real time and adjusts the air volume appropriately.

[0037] The oxygen content sensor 8 monitors the oxygen concentration inside the kiln in real time. If the oxygen content is too high, it indicates that there may be excess air in the combustion process, and the combustion efficiency is not optimal. The PLC controller 6 instructs the frequency converter 5 to reduce the air volume, so that the oxygen and fuel can achieve a better mixing ratio. If the oxygen content is too low, the combustion is incomplete, and a large amount of combustibles are not completely burned. The PLC controller 6 then increases the tertiary air volume to supplement oxygen, promote the complete combustion of fuel, maintain a good combustion atmosphere inside the kiln, and reduce the emission of harmful gases.

[0038] The PLC controller 6 sends a speed control signal corresponding to the calculated optimal air volume to the frequency converter 5. After receiving the signal, the frequency converter 5 adjusts the speed of the fan 4 in real time, thereby accurately changing the air volume of the fan 4, realizing precise and continuous control of the air, and ensuring the efficient, environmentally friendly and stable operation of the rotary kiln 1.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln tertiary air intelligent control system based on multi-parameter fusion, characterized in that, include: A fan (4) is connected to an air supply pipe (2). A flow regulator is installed inside the air supply pipe (2). Two clamping frames (17) are installed on the fan (4). A filter plate (18) is slidably connected inside the clamping frame (17). Two brush strips (19) are rotatably connected to the clamping frame (17). A handle (20) is rotatably connected to the brush strips (19). PLC controller (6), the PLC controller (6) is electrically connected to frequency converter (5), the frequency converter (5) is electrically connected to fan (4); The PLC controller (6) is electrically connected to a temperature sensor (10), a pressure sensor (9), and an oxygen content sensor (8).

2. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 1, characterized in that: The air supply pipe (2) is connected to the rotary kiln (1), and the temperature sensor (10), pressure sensor (9), and oxygen content sensor (8) are installed on the rotary kiln (1).

3. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 2, characterized in that: The PLC controller (6) is connected to the temperature sensor (10), pressure sensor (9), and oxygen content sensor (8) by a data acquisition device (7).

4. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 3, characterized in that: A level gauge (11) is installed on the rotary kiln (1), and the level gauge (11) is electrically connected to the collector (7).

5. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 1, characterized in that: The flow regulator includes an electric cylinder (14) and a baffle (15) rotatably connected to the electric cylinder (14), and the baffle (15) is rotatably connected to the air duct.

6. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 5, characterized in that: The electric cylinder (14) and the baffle (15) are respectively rotatably connected to a fixed seat (13) and a fixed shaft (16), and the fixed seat (13) and the fixed shaft (16) are connected to the air duct.

7. The intelligent control system for tertiary air of a rotary kiln based on multi-parameter fusion according to claim 5, characterized in that: The air supply pipe (2) is provided with an inspection port (12), and an inspection cover (3) is installed on the air supply pipe (2) to block the inspection port (12).

Images