Iron ore sintering bin dust control system

Abstract

The utility model discloses a kind of iron ore bin dust removal control systems, including air pressure air volume sensor, detection analyzer, valve controller, fan frequency converter and control device, air pressure air volume sensor is installed on the dust hood above each dust removal point's pipeline, air pressure air volume sensor is connected with detection analyzer, detection analyzer, valve controller, fan frequency converter are electrically connected with control device respectively;Detection analyzer analyzes the dust hood mouth wind pressure and air volume detection data collected, and determines the most suitable pressure, cover mouth wind speed parameter of each dust removal point;Valve controller is electrically connected with the control valve arranged at each dust removal point position pipeline;Fan frequency converter dynamically adjusts the operating frequency of ore bin dust removal fan motor according to the actual opening and closing quantity of control valve.The utility model under the premise of meeting ultra-low emission index, reduces fan energy consumption, makes dust removal system air volume utilization maximization.

Description

Technical Field

[0001] This utility model relates to the field of flue gas pipeline or powder transportation technology in metallurgy, non-ferrous metals, mining, etc., and specifically to a dust removal control system for iron ore troughs, which is applied in scenarios where there is flowing smoke or materials in the pipeline. Background Technology

[0002] Currently, the dust removal systems used in iron ore troughs all operate on the power frequency of the motors, and the air volume is adjusted by manually adjusting the opening of the fan inlet damper. However, adjusting the fan inlet damper opening to regulate and control the fan flow has the technical problem of being energy-inefficient.

[0003] The existing dust source control methods of the mine dust removal system are as follows: except for the dust removal pipeline of the sintering ore vibrating screen which has no valve control, the main belt feeding and return, as well as the coke and pellet (lump ore, miscellaneous ore) vibrating screens, all adopt manual valve control. The pipeline network is adjusted to the ideal state by manual valves, and all valves are in a fixed opening state. This control method results in too much ineffective dust removal, serious waste of dust removal air volume, and also causes some system resistance imbalance, excessive negative pressure and wind speed near the fan, and increased wear on branch pipeline valves and pipelines.

[0004] In summary, this has resulted in persistently high power consumption for the dust removal fans in the mine.

[0005] The steel industry is facing a severe downturn, with steel product prices remaining low and upstream raw material and energy prices high. Therefore, reducing energy waste, improving energy efficiency, lowering energy costs, and achieving maximum energy efficiency have become the priority for energy conservation and emission reduction in the steel industry. This is an urgent task that steel companies must complete to survive. Three major factors determine the need for energy conservation.

[0006] Energy conservation is a long-term, high-return investment, and it is more secure and less risky than other investment methods. Energy conservation helps reduce energy costs and improve a company's competitiveness and economic efficiency. Therefore, we should strengthen energy management and adopt technically feasible, economically reasonable, and environmentally and socially acceptable measures to reduce consumption, losses, and pollutant emissions, curb waste, and utilize energy effectively and rationally at every stage from energy production to consumption. Utility Model Content

[0007] In response to the current operating status of dust removal systems, and to make full use of existing organized dust removal systems in iron ore troughs, this utility model provides a dust removal control system for iron ore troughs. Through measures such as micro-negative pressure control, small-chamber dust suppression, dust removal valve control, and variable frequency speed regulation of fans, the aerodynamic matching between fans and pipelines is improved, system power consumption is reduced, and the dust removal system achieves its effectiveness in the most economical way. Under the premise of meeting ultra-low emission standards, fan energy consumption is reduced, and the air volume utilization of the dust removal system is maximized.

[0008] The technical solution adopted is as follows:

[0009] A dust removal control system for iron ore troughs includes air pressure and air volume sensors, a detection and analysis instrument, a valve controller, a fan frequency converter, and a control device. The air pressure and air volume sensors are installed on the pipes above the dust collection hoods at each dust collection point. The air pressure and air volume sensors are connected to the detection and analysis instrument. The detection and analysis instrument, valve controller, and fan frequency converter are electrically connected to the control device. The detection and analysis instrument determines the most suitable pressure and hood opening air velocity parameters for each dust collection point based on the air pressure and air volume at the dust collection hood opening. The valve controller is electrically connected to the control valves installed at each dust collection point's pipe, controlling the opening and closing of the corresponding control valves. The fan frequency converter adjusts the operating frequency of the dust collection fan motor in the ore trough according to the actual number of times the control valves are opened and closed.

[0010] Preferably, the system further includes several pressure sensors and dust removal backflushing devices. The dust removal backflushing devices and pressure sensors are respectively installed in each compartment of the dust collector and electrically connected to the control device. The pressure sensors are used to detect the real-time pressure and differential pressure of each compartment of the dust collector. The control device controls the corresponding dust removal backflushing device to perform backflushing action according to the differential pressure data of each compartment.

[0011] Preferably, the control device controls the dust removal backflushing device to perform backflushing action in a constant pressure backflushing mode.

[0012] More preferably, each of the control valves is connected to the valve controller via a cable, and the valve controller and the fan frequency converter are connected to a switch via optical fiber or network cable, and communicate with each other via the switch to obtain the control valve data and the frequency data of the dust removal fan motor in the mine. The control device adjusts the frequency of the dust removal fan motor in the mine through the fan frequency converter according to the number of valves opened and closed.

[0013] Preferably, the detection and analysis instrument analyzes the wind pressure and air volume detection data of the dust collection hood openings at each dust collection point, rebalances and adjusts the air volume and air pressure of each branch pipeline network, and when the control device controls the control valve to open, the corresponding dust collection point is in a slightly negative pressure state.

[0014] Preferably, the air pressure and air volume sensor is installed on the dust collection hood pipe corresponding to the material drop point of the vibrating screen, the material drop point of the ore conveyor belt, the material drop point of the coke conveyor belt, and the material drop point of the return ore and coke conveyor belt.

[0015] Furthermore, the system is also equipped with an intelligent power monitoring and metering device, which is connected to the dust removal fan motor in the mine trough, for collecting the current and voltage data of the dust removal fan motor in the mine trough, and is connected to the control device through a single-mode optical fiber and a switch.

[0016] The technical solution of this utility model has the following advantages:

[0017] A. This utility model automatically controls the opening and closing of each control valve according to the operating requirements of the dust removal process equipment in the mine trough by installing control valves on the pipelines at each dust removal point. This ensures that the dust collection hood at the dust removal point corresponding to the open control valve is at a suitable pressure and hood opening velocity, which only needs to meet the dust suction requirements. At the same time, the operating frequency of the dust removal fan motor in the mine trough is dynamically adjusted by the fan frequency converter according to the number of control valves that are activated, so as to achieve aerodynamic matching between the fan and the pipeline network, improve the utilization rate of the dust removal air volume of the fan, maximize the fan efficiency, reduce system power consumption, avoid wear and tear on valves and pipelines caused by large particles of material, and extend the service life of the control valves.

[0018] B. This utility model incorporates a pressure sensor and a dust removal back-flushing device in the dust collector of the mine dust removal system. It performs real-time pressure and differential pressure detection on each compartment of the dust collector and adopts a compartment constant pressure back-flushing method to accurately control the differential pressure in each compartment, thereby reducing the resistance loss of the dust collector, reducing the amount of compressed air used, extending the service life of the filter bags, and playing a role in diagnosing abnormalities in compartment pressure and differential pressure and preventing accidents, thus reducing the workload of on-site inspection and maintenance.

[0019] C. This utility model system can achieve a power saving rate of 35% and reduce carbon dioxide emissions, resulting in a reduction of electricity consumption of approximately 2.43 yuan per ton of iron. According to calculations, its application in the dust removal systems of the four blast furnaces of Benxi Steel is expected to save more than 21 million yuan per year in electricity and reduce carbon dioxide emissions by approximately 37,600 tons, demonstrating significant economic and social benefits. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model, the drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the installation position of the wind pressure and air volume sensor provided by this utility model;

[0022] Figure 2 This is a control structure diagram of the control system provided by this utility model;

[0023] Figure 3This utility model provides a schematic diagram of the frequency control principle for the dust collector motor in a mine trough.

[0024] Figure 4 This is a schematic diagram of the dust removal control valve and fan control principle provided by this utility model.

[0025] The symbols provided in the diagram are explained as follows:

[0026] 1-Pipeline; 2-Dust hood; 3-Air pressure and air volume sensor; 4-Control valve; 5-Valve controller; 6-Switchboard switch; 7-Fan frequency converter; 8-Mine trough dust removal fan motor; 9-Operator station. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] like Figure 1 and Figure 2 As shown, this utility model provides a dust removal control system for iron ore troughs. The system includes a wind pressure and air volume sensor 3, a detection and analysis instrument, a valve controller, a fan frequency converter, and a control device. The wind pressure and air volume sensor 3 is installed on the pipe 1 above the dust collection hood 2 at each dust removal point. The wind pressure and air volume sensor 3 is connected to the detection and analysis instrument. The detection and analysis instrument, valve controller, and fan frequency converter are electrically connected to the control device. The detection and analysis instrument analyzes the collected wind pressure and air volume detection data at the dust collection hood 2 opening and determines the most suitable pressure and hood opening wind speed parameters for each dust removal point. The valve controller is electrically connected to the control valves installed at each dust removal point pipe 1. The control valves are preferably pneumatic control valves, and the number of opening and closing of the corresponding control valves is controlled according to the operating requirements of the ore trough dust removal process equipment. The fan frequency converter dynamically adjusts the operating frequency of the ore trough dust removal fan motor according to the actual number of opening and closing of the control valves. The air pressure and air volume sensor 3 is installed on the dust collection hood 2 pipe 1 corresponding to the material drop point of the vibrating screen, the material drop point of the ore conveyor belt, the material drop point of the coke conveyor belt, and the material drop point of the return ore and coke conveyor belt.

[0029] In the design of dust removal system pipelines, the initial air volume data of each dust source point is often considered, while the changes in air volume and pressure caused by dynamic changes in system operating conditions are ignored. Therefore, the actual air volume and pressure at each point in use differ from the initial design. To meet the actual air volume requirements of each dust source point, the air volume and pressure of each branch pipeline are first diagnosed and tested using a detection and analysis instrument. The test data is analyzed to determine the most suitable operating parameters such as pressure and hood velocity at each dust removal point. Following the principle of micro-negative pressure control, this invention achieves secondary distribution of air volume and pressure in each branch pipeline through small-chamber dust suppression, multi-point dust collection, and existing manual valve devices. This achieves system pipeline resistance balance and reasonable air volume distribution, keeping the dust removal points in a micro-negative pressure state. This allows for the removal of dust below the dust hood while retaining large particles of hard sintered mineral material, thereby improving the overall dust removal effect of the system, reducing wear on the pipeline and valves, and extending the service life of the equipment.

[0030] The control valve control measures adopted in this utility model are as follows:

[0031] For example, this utility model adds pneumatic control valves to all dust removal points such as several return ore dropping points, several return coke dropping points, several ore dropping points, several coke dropping points, several vibrating screens (vibrating feeders), intermediate weighing hoppers, and belt conveyor head and tail.

[0032] The control method of this utility model has strict requirements on the frequency of use of the control valve. In order to extend the service life of the control valve and reduce the failure rate and maintenance, the following technical measures are adopted:

[0033] In terms of technology: Since the system uses micro-negative pressure control at the source, it ensures that the dust hood sucks up dust, rather than large particles of hard sintered mineral materials, which can reduce the wear of control valves and pipes and extend the service life of control valves.

[0034] Equipment body: The valve body and valve plate of the control valve adopt a wear-resistant structure design, while the cylinder piston rod is equipped with dust protection to avoid direct contact with dust; the cylinder piston sealing ring is made of wear-resistant, oil-resistant, pressure-resistant, and aging-resistant rubber; high-quality triple unit is used to ensure high air supply, filtration accuracy, and good cylinder lubrication; the cylinder adopts dual air supply, using purified compressed air in summer and nitrogen in winter.

[0035] The control valves in this invention are interlocked and opened / closed based on the operating status of the on-site process equipment. When the main process equipment is running, dust is generated at the dust source, and the dust removal control valves immediately open to collect the dust, ensuring a clean environment with no dust escaping or spreading. When the main process equipment stops running, the dust gradually disappears as the equipment stops, and the dust removal control valves automatically close after a delay. This avoids all control valves being constantly open, reducing ineffective airflow and achieving energy and air savings.

[0036] This invention dynamically adjusts the frequency of the dust collector fan motor in the ore bin according to the operating status of the process equipment and the actual number of valves opened. By adjusting the frequency of the dust collector fan motor through a frequency converter, the fan speed is changed. It has been verified that the frequency conversion method of adjusting the fan flow is far more energy-efficient than the damper adjustment method.

[0037] as follows Figure 3 As shown, each control valve 4 is connected to the valve controller 5 via cables. The valve controller 5 and the fan frequency converter 7 are connected to the switch 6 via fiber optic cable or network cable, and communicate with each other through the switch 6 to control the data of the valve 4 and the frequency data of the dust collector fan motor 8 in the mine. The control device adjusts the frequency of the dust collector fan motor 8 in real time through the fan frequency converter 7 according to the number of valve openings and closings. Operators can observe the fan frequency values ​​and trend curves on the operator station 9, and view real-time and historical data.

[0038] Figure 4 In this system, a corresponding number of control valves are activated according to the dust removal requirements of the production process. The valve control signals are transmitted to the PLC system via cables. After data analysis and logical judgment, the valve opening degree is determined. The operating speed of the fan motor is generated based on the actual number of valves opened. The frequency converter is used to automatically adjust the operating frequency of the dust removal fan motor in the mine trough, thereby achieving the purpose of air volume regulation. This ensures that the dust removal air volume of the mine trough dust removal fan matches the dynamic adjustment requirements of the valve load, improves the utilization efficiency of the dust removal air volume of the mine trough dust removal fan, and maximizes the efficiency of the fan.

[0039] As a further preferred embodiment of this utility model, the system also includes several pressure sensors and dust removal backflushing devices. The dust removal backflushing devices and pressure sensors are correspondingly installed in each compartment of the dust collector and electrically connected to the control device. The pressure sensors are used to detect the real-time pressure and differential pressure of each compartment of the dust collector. The control device controls the corresponding dust removal backflushing device to perform backflushing actions based on the differential pressure data of each compartment. This utility model further enhances the detection of differential pressure in each compartment of the dust collector, enabling real-time pressure and differential pressure detection in each compartment. By adopting a compartment-based constant pressure backflushing method, the differential pressure in each compartment is precisely controlled, reducing the resistance loss of the dust collector, reducing compressed air consumption, extending the service life of the filter bags, and playing a role in diagnosing abnormalities in compartment pressure and differential pressure and preventing accidents, thus reducing the workload of on-site inspection and maintenance.

[0040] The pressure sensor is connected to the operator station via a cable, allowing the operator to view the pressure values ​​and trend curves, as well as real-time and historical data.

[0041] This invention further incorporates an intelligent energy monitoring and metering device within the system. This device is connected to the motor of the dust collector fan in the mine trough, and is used to collect the current and voltage data of the fan motor. The data is then connected to the control device via a single-mode fiber optic cable and a switch. The intelligent energy monitoring and metering device integrates metering, display, communication, and monitoring functions. It can accurately measure three-phase forward and reverse active energy, four-quadrant reactive energy, and demand in a time-series manner; precisely measure three-phase voltage, current, active power, reactive power, and power factor in real time; monitor and record events such as voltage loss, current loss, and phase loss; and enable remote and local meter reading and programming functions.

[0042] The system of this utility model can achieve a power saving rate of 35% and reduce carbon dioxide emissions, resulting in a reduction of electricity consumption of approximately 2.43 yuan per ton of iron. According to calculations, its application in the dust removal system of the four blast furnaces of Benxi Steel is expected to save more than 21 million yuan per year in electricity and reduce carbon dioxide emissions by approximately 37,600 tons, demonstrating significant economic and social benefits.

[0043] The wind pressure and air volume sensors, detection and analysis instruments, valve controllers, and fan frequency converters used above are all commercially available products. The PLC control used in the control device is also a conventional control. Those skilled in the art can achieve the purpose of this utility model by simply editing the control program based on the logical relationship between the various devices provided by this utility model, which will not be elaborated here.

[0044] Any aspects not covered in this utility model are applicable to the prior art.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A dust removal control system for iron ore troughs, characterized in that, The system includes air pressure and air volume sensors, a detection and analysis instrument, a valve controller, a fan frequency converter, and a control device. The air pressure and air volume sensors are installed on the pipes above the dust collection hoods at each dust collection point. The air pressure and air volume sensors are connected to the detection and analysis instrument. The detection and analysis instrument, valve controller, and fan frequency converter are electrically connected to the control device. The detection and analysis instrument determines the most suitable pressure and hood opening air velocity parameters for each dust collection point based on the air pressure and air volume at the dust collection hood opening. The valve controller is electrically connected to the control valves installed at each dust collection point's pipe, controlling the opening and closing of the corresponding control valves. The fan frequency converter adjusts the operating frequency of the dust collection fan motor in the mine trough according to the actual number of times the control valves are opened and closed.

2. The dust removal control system for iron ore troughs according to claim 1, characterized in that, The system also includes several pressure sensors and dust removal backflushing devices. The dust removal backflushing devices and pressure sensors are respectively installed in each compartment of the dust collector and are electrically connected to the control device. The pressure sensors are used to detect the real-time pressure and pressure difference of each compartment of the dust collector. The control device controls the corresponding dust removal backflushing device to perform backflushing action according to the pressure difference data of each compartment.

3. The dust removal control system for iron ore troughs according to claim 2, characterized in that, The control device controls the dust removal backflushing device to perform backflushing action in a constant pressure backflushing mode.

4. The dust removal control system for iron ore troughs according to claim 1, characterized in that, Each of the control valves is connected to the valve controller via a cable. The valve controller and the fan frequency converter are connected to a switch via optical fiber or network cable, and communicate with each other via the switch to obtain the control valve data and the frequency data of the dust removal fan motor in the mine. The control device adjusts the frequency of the dust removal fan motor in the mine through the fan frequency converter according to the number of valves opened and closed.

5. The dust removal control system for iron ore troughs according to claim 1, characterized in that, The detection and analysis instrument analyzes the air pressure and air volume detection data of the dust collection hood openings at each dust collection point, and rebalances and adjusts the air volume and air pressure of each branch pipeline network. When the control device controls the control valve to open, the corresponding dust collection point is in a slightly negative pressure state.

6. The dust removal control system for iron ore troughs according to claim 5, characterized in that, The air pressure and air volume sensors are installed on the dust collection hood pipes corresponding to the material drop points of the vibrating screen, ore conveyor belt, coke conveyor belt, and return ore / coke conveyor belt.

7. The dust removal control system for iron ore troughs according to any one of claims 1-6, characterized in that, The system is also equipped with an intelligent power monitoring and metering device, which is connected to the dust removal fan motor in the mine trough. It is used to collect the current and voltage data of the dust removal fan motor in the mine trough and connects to the control device through a single-mode optical fiber and a switch.

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