A blast furnace material on-line drying and feeding system and a control method thereof

Abstract

The application provides a blast furnace material online drying and feeding system and a control method thereof. The system comprises: a stock bin, the bottom of the stock bin is provided with a plurality of discharge ports; at least two vibrating screen feeding devices, the vibrating screen feeding device comprises a material outlet and a powder outlet; a plurality of drying pipes, the drying pipe corresponds to the discharge port one by one, one end of each drying pipe is connected with the corresponding discharge port, and the other end is connected with the vibrating screen feeding device, and each vibrating screen feeding device is connected with at least one drying pipe; a heating device, which is used for heating the internal space of the drying pipe; a material weighing device, the feeding port of the material weighing device is connected with the material outlet of the vibrating screen feeding device; and a material conveying device, which is used for conveying the material discharged from the material weighing device to the blast furnace. The system can realize online drying and screening of the material, reduce the water content and powder content of the material, ensure the stable blast furnace condition, has low system construction and operation cost, and can meet the requirements of energy saving and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of metallurgical production technology, and more specifically, to an online drying and feeding system for blast furnace materials and its control method. Background Technology

[0002] Blast furnace ironmaking is currently the main method for producing molten iron in a long-process system. A typical blast furnace is equipped with a coke bin containing more than twenty silos to store different feed materials, such as coke, sinter, pellets, lump ore, and other miscellaneous ores. The blast furnace coke bin is not only the raw material storage silo of the blast furnace ironmaking system but also the largest facility in the entire system in terms of floor space. Some feed materials with high moisture content (such as ore lumps and coke) will bring excessive powder into the blast furnace, affecting its permeability. Moreover, drying moisture requires energy and time, which correspondingly increases the coke ratio of the blast furnace. Therefore, in order to ensure stable furnace conditions and reduce production costs, feed materials with high moisture content need to be dried.

[0003] In existing technologies, offline drying devices are generally used to dry raw materials such as ore blocks and coke. For example, patent documents CN205119745U and CN216953817U disclose an offline drying device that can reduce the moisture content of furnace feed. However, the device and its supporting dust removal facilities occupy a large area and require significant investment. Moreover, the device consumes a lot of energy and causes significant secondary pollution during operation, requiring secondary pollution control. The temperature of the dried ore blocks will also cool down, resulting in serious energy waste. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to develop an online drying system for blast furnace materials, thereby reducing equipment investment and production costs, improving energy efficiency, and reducing environmental pollution.

[0005] To achieve the above objectives, the first aspect of the present invention provides an online drying and feeding system for blast furnace materials, comprising:

[0006] A hopper, the bottom of which is provided with multiple discharge ports;

[0007] At least two vibrating screen feeding devices, each vibrating screen feeding device including a material outlet and a powder outlet;

[0008] Multiple drying pipes are provided, each corresponding to a discharge port. One end of each drying pipe is connected to the corresponding discharge port, and the other end is connected to the vibrating screen feeding device. Each vibrating screen feeding device is connected to at least one drying pipe.

[0009] A heating device is used to heat the internal space of the drying tube;

[0010] A material weighing device, wherein the inlet of the material weighing device is connected to the material outlet of the vibrating screen feeding device;

[0011] A material conveying device for conveying material discharged from the material weighing device to a blast furnace;

[0012] A vacuum device is used to evacuate the silo, and the inlet end of the vacuum device is connected to the silo.

[0013] A vapor-water separation device, wherein the outlet end of the vacuum device is connected to the vapor-water separation device;

[0014] A powder weighing device, wherein the inlet of the powder weighing device is connected to the powder outlet of the vibrating screen feeding device;

[0015] A powder conveying device is used to convey the powder discharged from the powder weighing device to the powder briquetting device.

[0016] The powder briquetting device is used to press powder into briquettes;

[0017] A lifting device is used to transport the powder, which has been compressed into balls, to the hopper.

[0018] During the feeding process, high-moisture-content materials are discharged from the silo and enter the drying pipe, where they are heated and dried. The dried material then enters a vibrating screen feeding device to be screened out as powder. It is then weighed as needed and transported to the blast furnace according to process requirements. This system, by setting up drying pipes and vibrating screen feeding devices connected to the silo and feeding system, can achieve online drying and screening of materials, thereby reducing the moisture and powder content of the materials, ensuring stable blast furnace conditions, and achieving low construction and operating costs while meeting energy conservation and emission reduction requirements. A vacuum device allows high-temperature gas from the drying pipe to enter the silo, preheating the material inside. The preheated low-temperature gas then enters a steam-water separator. The separated gas is discharged, while the water is stored in a water tank for recycling. The dried and screened powder is directly briquetized for recycling, avoiding secondary handling and improving material utilization.

[0019] Furthermore, the lower part of the hopper is equipped with a distribution plate, which divides the lower part of the hopper into multiple feeding spaces, each of which is connected to a discharge port. The division of the hopper into multiple feeding spaces ensures that the material entering each drying pipe is uniform, guaranteeing consistent drying results. Simultaneously, each drying pipe is connected to multiple vibrating screen feeding devices, which can operate in stages according to the required material quantity, improving weighing accuracy.

[0020] Furthermore, the heating device is an electromagnetic heating coil, and the electromagnetic heating coil is wound around the outside of each of the drying tubes. Using an electromagnetic heating coil as the heating source provides accurate temperature control, good heating uniformity, and high heating efficiency.

[0021] Furthermore, the system also includes a powder weighing device, a powder conveying device, a powder briquetting device, and a lifting device. The inlet of the powder weighing device is connected to the powder outlet of the vibrating screen feeding device. The powder conveying device is used to transport the powder discharged from the powder weighing device to the powder briquetting device, which is used to press the powder into briquettes. The lifting device is used to transport the briquetted powder to the silo. The dried and screened powder is directly briquetted for recycling, avoiding secondary handling and improving material utilization.

[0022] Furthermore, the system also includes a dust removal device and multiple dust collection hoods. The dust collection hoods are connected to the inlet of the dust removal device. Each of the vibrating screen feeding device, the material weighing device, the powder conveying device, and the material conveying device has a dust removal point at its inlet and outlet ends, and a dust collection hood is installed at each of these dust removal points. The dust removal points are designed according to the characteristics of the system. Dust is collected from the system's dust-generating points using dust collection hoods, and then further removed by the dust removal device, reducing environmental pollution.

[0023] Furthermore, the pipes connecting the dust collection hoods corresponding to the vibrating screen feeding device, the material weighing device, and the powder conveying device converge into the first dust collection branch pipe, and the pipes connecting the dust collection hoods corresponding to the inlet and outlet ends of the material conveying device converge into the second dust collection branch pipe. Both the first and second dust collection branch pipes are equipped with control valves. This allows for time-segmented dust removal at dust-generating locations, ensuring effective dust removal while saving energy.

[0024] A second aspect of the present invention provides a control method for the above-mentioned online drying and feeding system for blast furnace materials, comprising the following steps:

[0025] Material preheating: After the initial moisture content of the material is detected, it is put into the silo. The vacuum device is operated to maintain a negative pressure state in the silo. Hot air from the drying tube enters the silo to preheat the material.

[0026] Material drying: The material in the silo enters the drying pipe from the discharge port. The power of the heating device is adjusted according to the initial moisture content of the material and the temperature of the silo to control the drying temperature so that the material output from the drying pipe reaches the set moisture content.

[0027] Material weighing: Multiple vibrating screen feeding devices work simultaneously. The screened material enters the material weighing device. When the weight reaches the set percentage of the weighing set amount, one vibrating screen feeding device starts working while the other vibrating screen feeding devices stop, until the material weighing device reaches the weighing set amount.

[0028] Material conveying: The material weighing device discharges the material, and the material conveying device is started to transport the material to the blast furnace;

[0029] Powder circulation: The powder screened out by the vibrating screen feeding device enters the powder weighing device. After the weighing set amount is reached, the powder briquetting device is started to press the powder into briquettes, which are then conveyed to the silo by the lifting device.

[0030] Furthermore, in the material weighing step, the set percentage of the weighing quantity is 90% to 95%. This control method can improve weighing accuracy while ensuring efficiency.

[0031] Furthermore, in the material drying step, the temperature of the silo and the initial moisture content of the material are used as feedforward variables, and the temperature and moisture content of the material output from the drying pipe are used as loop feedback. A feedforward control feedback method is employed to control the power of the heating device and the drying temperature, thereby controlling the moisture content of the material output from the drying pipe. This invention uses a feedforward-feedback method for intelligent composite control of the heating device, which can precisely control the heating power and drying temperature. It can also perform metering analysis based on material characteristics, significantly improving the accuracy and stability of moisture content control.

[0032] Furthermore, in the material drying step, the set moisture content of the material output from the drying pipe is 1% to 5%. After drying, the moisture content of the material decreases significantly, achieving the goal of feeding refined feed into the blast furnace, ensuring the stability of the blast furnace condition, and reducing the cost of ironmaking production.

[0033] Furthermore, in the material drying step, the drying temperature range is 200–300°C. By controlling a suitable drying temperature range according to the material characteristics, easily explosive materials are caused to explode prematurely during the heating and drying process, allowing for clean screening before entering the furnace, reducing the amount of powder entering the furnace, and minimizing the impact of material explosion within the furnace.

[0034] Furthermore, in the material drying step, the drying time is shorter than the corresponding batch blast furnace charging time. The drying time is controlled to meet the blast furnace charging process sequence.

[0035] In summary, the present invention has the following advantages over the prior art:

[0036] (1) This invention integrates the functions of material preheating, drying, screening, feeding, and recycling of undersize powder into one, realizing online drying of high moisture content materials. The overall process is short, the production efficiency is high, the operating energy consumption is low, the engineering construction and production operation costs are low, and the economic and social benefits are obvious.

[0037] (2) The feeding system of the present invention can realize online drying and powder screening of materials, thereby reducing the moisture content and powder content of the materials entering the blast furnace, ensuring the stability of the blast furnace condition, and reducing the coke ratio. The system can increase the lump ore ratio of the blast furnace when used for lump ore feeding, thereby reducing production costs.

[0038] (3) The feeding system of the present invention uses multiple drying tubes to heat the material, which accelerates the heat transfer speed and makes full use of energy. It also uses an electromagnetic heating coil as a heating source, which ensures accurate temperature control and high heating efficiency. Combined with a vacuum device, it can also preheat the material in the silo, thereby improving energy utilization.

[0039] (4) The feeding system of the present invention is equipped with a dust removal device to effectively treat the dust generated by the vibrating screen feeding, weighing, discharging and transportation, so as to meet the requirements of environmental protection.

[0040] (5) The heating device of the present invention adopts feedforward-feedback composite control and combines electromagnetic heating to control the drying temperature, thereby accurately controlling the moisture content of the material, and its power consumption is kept at a low level, with good stability, economy and safety. Attached Figure Description

[0041] Figure 1 This is a process flow diagram of the online drying and feeding system for blast furnace materials in a specific embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of the internal structure of the silo in a specific embodiment of the present invention.

[0043] Figure 3 This is a control flowchart of the online drying and feeding system for blast furnace materials in a specific embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1-Hopper, 2-Drying pipe, 3-Vibrating screen feeding device, 4-Material weighing device, 5-Material conveying device, 6-Vacuum device, 7-Air-water separation device, 8-Water tank, 9-Powder weighing device, 10-Powder conveying device, 11-Powder briquetting device, 12-Lifting device, 13-Dust removal device, 14-Dust collection hood, 15-First dust removal branch pipe, 16-Second dust removal branch pipe, 17-First control valve, 18-Second control valve, 19-Electromagnetic heating coil, 20-Discharge port, 21-Distribution plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Combination Figure 1 and Figure 2As shown, an embodiment of the present invention provides an online drying and feeding system for blast furnace materials, mainly used for feeding materials with high moisture content, such as ore lumps and coke, to the blast furnace. The system includes a silo 1, multiple drying pipes 2, multiple vibrating screen feeding devices 3, a material weighing device 4, and a material conveying device 5. The silo 1 is used to store materials, and multiple discharge ports 20 are provided at the bottom of the silo 1. The number of drying pipes 2 is the same as the number of discharge ports 20 in the silo 1. The inlet end of the drying pipe 2 is connected to the discharge port 20. The drying pipe 2 is equipped with a heating device for heating the internal space of the drying pipe 2. The material is discharged from the discharge port 20 and enters the drying pipe 2 to achieve heating and drying. The vibrating screen feeding devices 3 are used to screen the dried material, removing the powder. The discharge end of the drying pipe 2 is connected to the vibrating screen feeding device 3, and each vibrating screen feeding device 3 is connected to at least one drying pipe 2. In this embodiment, there are four drying pipes 2 and two vibrating screen feeding devices 3, each connected to two drying pipes 2. Specifically, the vibrating screen feeding device 3 can be a tension screen, a circular vibrating screen, or other screening equipment. The material weighing device 4 is used to accurately weigh the material; its inlet is connected to the material outlet of the vibrating screen feeding device 3. The vibrating screen feeding device 3 conveys the material after powder removal to the material weighing device 4. Specifically, the material weighing device 4 can be a weighing hopper or other weighing equipment. The material conveying device 5 is used to convey the material discharged from the material weighing device 4 to the blast furnace. Specifically, the material conveying device 5 can be a conveying sleeve or other conveying equipment.

[0050] During system operation, high-moisture-content materials are discharged from silo 1 and enter drying pipe 2, where they are heated and dried. The dried material then enters vibrating screen feeding device 3 to be screened out as powder. It is then weighed as needed and transported to the blast furnace according to process requirements. This system enables online drying and screening of materials, reducing the moisture and powder content of materials entering the blast furnace, ensuring stable blast furnace conditions, and helping to reduce production costs. This system eliminates the need for independent drying equipment, saving on engineering construction costs. The dried material is directly fed into the blast furnace, resulting in low energy consumption.

[0051] Combination Figure 1As shown, the blast furnace material online drying and feeding system of this embodiment also has a preheating function, including a vacuum device 6, a steam-water separator 7, and a water tank 8. The inlet of the vacuum device 6 is connected to the silo 1, keeping the silo 1 under vacuum. This allows the hot air in the drying pipe 2 to naturally flow into the silo 1, preheating the material and improving energy utilization efficiency. In a specific embodiment, the vacuum device 6 can be a vacuum pump, blower, or other vacuuming equipment. The outlet of the vacuum device 6 is connected to the inlet of the steam-water separator 7. The preheated low-temperature gas enters the water separator to achieve gas-liquid separation, and the separated gas is discharged. The outlet of the steam-water separator 7 is connected to the water tank 8, where the separated liquid water is stored and can be recycled.

[0052] The blast furnace material online drying and feeding system of this embodiment also includes a powder recycling and reuse process, specifically including a powder weighing device 9, a powder conveying device 10, a powder briquetting device 11, and a lifting device 12. The inlet of the powder weighing device 9 is connected to the powder outlet of the vibrating screen feeding device 3, used to collect and weigh the screened powder. The powder conveying device 10 is used to convey the powder discharged from the powder weighing device 9 to the powder briquetting device 11; in a specific embodiment, the powder conveying device 10 is generally a conveyor belt. The powder briquetting device 11 is used to press the powder into briquettes, and the lifting device 12 is used to send the briquetted powder back to the silo 1. Thus, the above process allows the dried and screened powder to be directly briquetized and recycled, avoiding secondary handling and improving material utilization.

[0053] The blast furnace material online drying and feeding system of this embodiment also includes a dust removal device 13, which corresponds to one or more silos 1 and is used to collect dust from the dust-generating points of the system. The inlet of the dust removal device 13 is connected to multiple dust collection hoods 14, the number of which corresponds to the number of dust-generating points in the system, with one dust collection hood 14 installed next to each dust-generating point. In this embodiment, a dust removal point is set at the inlet and outlet ends of the vibrating screen feeding device 3, the material weighing device 4, the powder conveying device 10, and the material conveying device 5, respectively. According to the different dust-generating locations in different time periods of the system, the pipes connected to the dust collection hoods 14 corresponding to the vibrating screen feeding device 3, the material weighing device 4, and the powder conveying device 10 are collected into a first dust removal branch pipe 15, and a first control valve 17 is installed on the first dust removal branch pipe 15; the pipes connected to the dust collection hoods 14 corresponding to the inlet and outlet ends of the material conveying device 5 are collected into a second dust removal branch pipe 16, and a second control valve 18 is installed on the second dust removal branch pipe 16. The control system controls the opening and closing of the first control valve 17 and the second control valve 18 according to the operating status of the equipment, performs dust removal in different time periods, and adjusts the power of the dust removal device 13, which can both ensure the dust removal effect and save energy.

[0054] Combination Figure 2As shown, the lower part of the silo 1 is equipped with a distribution plate 21, which divides the lower part of the silo 1 into multiple feeding spaces, each feeding space being connected to a discharge port 20. In this embodiment, the silo 1 is cubic in shape, and the distribution plate 21 is cross-shaped, dividing the lower part of the silo 1 into four compartments. Multiple feeding spaces ensure that the material entering each drying pipe 2 is uniform, improving the drying speed and ensuring consistent drying effect. Simultaneously, multiple vibrating screen feeding devices 3 are provided, which can operate in stages according to the required material quantity.

[0055] In this embodiment, the heating device is an electromagnetic heating coil 19, which is wound around the outside of the drying tube 2. This allows for uniform heating inside the drying tube 2, accurate temperature control, and high heating efficiency. In a preferred embodiment, the hopper 1 and the drying tube 2 are also provided with an insulation layer, which reduces heat loss from the hopper 1 and the drying tube 2, improves energy efficiency, and ensures preheating and drying effects.

[0056] Combination Figure 3 As shown, the control method for the above-mentioned online drying and feeding system for blast furnace materials includes the following steps:

[0057] (1) Material preheating: After the initial moisture content of the material is detected, it is put into the silo 1. The vacuum device 6 is operated to keep the silo 1 under negative pressure. Hot air in the drying tube 2 enters the silo 1 to preheat the material.

[0058] (2) Material drying: The material in the silo 1 enters the drying pipe 2 from the discharge port 20. The power of the heating device is adjusted according to the initial moisture content of the material and the temperature of the silo 1 to control the drying temperature so that the material output from the drying pipe 2 reaches the set moisture content.

[0059] In the material drying process, the control system employs a feedforward-feedback composite control method. The temperature of silo 1 and the initial moisture content of the material are used as feedforward variables, and these disturbance variables are compensated for in a timely manner. Feedforward control feedback is used to control the power of the heating device and the drying temperature. The control system uses the temperature and moisture content of the material output from drying pipe 2 as loop feedback, comparing and analyzing the detected temperature of the discharged material with the predicted temperature and continuously optimizing the process to ensure that the material moisture content reaches the set value. This intelligent control system can effectively control the moisture content of the material, significantly improving control accuracy and stability.

[0060] In various embodiments, the set moisture content range of the material output from the drying pipe 2 is generally between 1% and 5%. The target moisture content can be set according to the material characteristics, such as about 2% for lump ore. During the material drying process, the drying temperature should not be too high, preferably between 200 and 300°C. During the heating and drying process, easily explosive materials are made to explode in advance, and the material is screened cleanly before entering the furnace, reducing the amount of powder entering the furnace.

[0061] During the production process, blast furnace materials are transported in multiple batches. The charging time for each batch is generally the same, but there may be differences. The material drying time must be shorter than the corresponding batch's blast furnace charging time to meet the blast furnace charging process sequence requirements. At the same time, the drying time also needs to be adjusted according to the target moisture content to meet the material drying requirements.

[0062] (3) Material Weighing: Multiple vibrating screen feeding devices 3 operate simultaneously. The screened material enters the material weighing device 4. When the weight reaches the set percentage of the weighing set amount, one vibrating screen feeding device 3 starts operating while the other vibrating screen feeding devices 3 stop, until the material weighing device 4 reaches the weighing set amount. For example, multiple vibrating screen feeding devices 3 can be operated together to bring the amount of material entering the material weighing device 4 to 95%, and then one of the vibrating screen feeding devices 3 can be operated alone to bring the material to the set weight. In various embodiments, the set percentage of the weighing set amount is generally 90% to 95%. This working method can improve the weighing accuracy.

[0063] (4) Material conveying: The material weighing device 4 discharges the material, and the material conveying device 5 starts to convey the material to the blast furnace.

[0064] (5) Powder circulation: The powder screened by the vibrating screen feeding device 3 enters the powder weighing device 9. After the weighing set amount is reached, the powder briquetting device 11 is started to press the powder into briquettes, which are then conveyed to the silo 1 by the lifting device 12.

[0065] The above control method integrates material preheating, drying, screening, feeding, undersize powder reuse, and dust removal into one process, realizing online drying of high moisture content materials. It can effectively reduce the moisture and powder content of the materials entering the furnace, reduce the coke ratio, reduce the smelting cost of the blast furnace, and the overall process is short, with high production efficiency, low operating energy consumption, and the ability to achieve clean production. It has significant economic benefits and has a good prospect for application and promotion.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online drying and feeding system for blast furnace materials, characterized in that, include: The hopper (1) has multiple discharge ports (20) at its bottom and a material distribution plate (21) at its lower part. The material distribution plate (21) divides the lower part of the hopper (1) into multiple material feeding spaces, and each material feeding space is connected to one of the discharge ports (20). At least two vibrating screen feeding devices (3), wherein the vibrating screen feeding device (3) includes a material outlet and a powder outlet; Multiple drying pipes (2), each drying pipe (2) corresponds to a discharge port (20), one end of each drying pipe (2) is connected to the corresponding discharge port (20), and the other end is connected to the vibrating screen feeding device (3), and each vibrating screen feeding device (3) is connected to at least one drying pipe (2). A heating device is used to heat the internal space of the drying tube (2); a material weighing device (4) is used, the inlet of which is connected to the material outlet of the vibrating screen feeding device (3); the heating device is an electromagnetic heating coil (19), the electromagnetic heating coil (19) is wound around the outside of each drying tube (2); the silo (1) and the drying tube (2) are provided with a heat insulation layer. Material conveying device (5) is used to convey the material discharged from the material weighing device (4) to the blast furnace; A vacuum device (6) is used to evacuate the silo (1), and the inlet end of the vacuum device (6) is connected to the silo (1). A vapor-water separator (7) is provided, wherein the outlet end of the vacuum device (6) is connected to the vapor-water separator (7); Powder weighing device (9), the inlet of the powder weighing device (9) is connected to the powder outlet of the vibrating screen feeding device (3); A powder conveying device (10) is used to convey the powder discharged from the powder weighing device (9) to the powder briquetting device (11); The powder briquetting device (11) is used to press powder into briquettes; Lifting device (12) is used to convey the powder that has been pressed into balls to the silo (1).

2. The online drying and feeding system for blast furnace materials according to claim 1, characterized in that, It also includes a dust removal device (13) and multiple dust collection hoods (14). The dust collection hoods (14) are connected to the inlet of the dust removal device (13). The inlet and outlet ends of the vibrating screen feeding device (3), the material weighing device (4), the powder conveying device (10), and the material conveying device (5) are each provided with a dust removal point, and a dust collection hood (14) is provided at each of the dust removal points.

3. The online drying and feeding system for blast furnace materials according to claim 2, characterized in that, The pipes connected to the dust collection hood (14) corresponding to the vibrating screen feeding device (3), the material weighing device (4), and the powder conveying device (10) converge to the first dust removal branch pipe (15). The pipes connected to the dust collection hood (14) corresponding to the inlet and outlet ends of the material conveying device (5) converge to the second dust removal branch pipe (16). Both the first dust removal branch pipe (15) and the second dust removal branch pipe (16) are equipped with control valves.

4. A control method for an online drying and feeding system for blast furnace materials as described in any one of claims 1-3, characterized in that, Includes the following steps: Material preheating: After the initial moisture content of the material is detected, it is put into the silo (1). The vacuum device (6) is operated to keep the silo (1) under negative pressure. Hot air in the drying tube (2) enters the silo (1) to preheat the material. Material drying: The material in the silo (1) enters the drying tube (2) from the discharge port (20). The power of the heating device is adjusted according to the initial moisture content of the material and the temperature of the silo (1) to control the drying temperature so that the material output from the drying tube (2) reaches the set moisture content. Material weighing: Multiple vibrating screen feeding devices (3) work simultaneously. The screened material enters the material weighing device (4). When the weight reaches the set percentage of the weighing set amount, one vibrating screen feeding device (3) works and the other vibrating screen feeding devices (3) stop until the material weighing device (4) reaches the weighing set amount. Material conveying: The material weighing device (4) discharges the material, and the material conveying device (5) starts to convey the material to the blast furnace; Powder circulation: The powder screened by the vibrating screen feeding device (3) enters the powder weighing device (9). After reaching the set weighing amount, the powder briquetting device (11) is started to press the powder into briquettes, which are then conveyed to the silo (1) by the lifting device (12).

5. The control method for the online drying and feeding system of blast furnace materials according to claim 4, characterized in that, In the material weighing step, the set percentage of the weighing quantity is 90% to 95%.

6. The control method for the online drying and feeding system of blast furnace materials according to claim 5, characterized in that, In the material drying step, the temperature of the silo (1) and the initial moisture content of the material are used as feedforward variables, and the temperature and moisture content of the material output by the drying tube (2) are used as loop feedback. The power of the heating device and the drying temperature are controlled by the feedforward control feedback method, so as to control the moisture content of the material output by the drying tube (2).

7. The control method for the online drying and charging system for blast furnace materials according to claim 6, characterized in that, In the material drying step, the set moisture content of the material output from the drying tube (2) is 1% to 5%.

8. The control method for the online drying and feeding system of blast furnace materials according to claim 4, characterized in that, In the material drying step, the drying time is less than the blast furnace charging time for the corresponding batch.

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