Continuous storage and distribution system for raw materials of rotary hearth furnace and control method

Abstract

The invention relates to a rotary hearth furnace raw material continuous storage and distribution system and a control method, and belongs to the technical field of ferrous metallurgy environmental protection. Comprising an ash feeding device, a batching silo, an unloading facility under the silo, a maintenance material warehouse, a warehouse bottom ash conveying device, an elevator, a distributor, a warehouse top ash conveying device, a silo top ash conveying device, a compressed gas supply facility, a dust removal facility and an electric control system. During normal production of the rotary hearth furnace, raw materials are directly conveyed to the batching silo through the ash feeding device to be metered and fed into the furnace; and during shutdown maintenance, the materials are switched to the maintenance material warehouse for storage, and the materials are conveyed back to the batching silo through the closed loop after production is recovered. The system adopts intelligent control logic, monitors the material level and temperature in real time, periodically starts a material circulation mode to prevent hardening, and performs automatic interlocking protection when the temperature exceeds the limit or the material level is abnormal. The problem of dust and mud accumulation during shutdown of the rotary hearth furnace can be solved, and the material receiving continuity is improved; temperature monitoring and a circulation mechanism are combined, so that material hardening and spontaneous combustion risks are avoided; the production stability and the environmental protection compliance are improved.

Description

Technical Field

[0001] The present invention belongs to the field of material storage and transportation, and relates to a continuous storage and distribution system and control method for rotary hearth furnace raw materials. Background Art

[0002] In the iron and steel metallurgy industry, the efficient disposal of iron and zinc-containing dust and sludge has been a long-standing technical problem. Due to advantages such as high operating stability, wide raw material adaptability, and high product added value, the rotary hearth furnace process has gradually become the mainstream technology for steel enterprises to treat zinc-containing dust and sludge. However, existing rotary hearth furnace production lines still face significant bottlenecks in actual applications: The rotary hearth furnace needs to be shut down for maintenance for about 10 to 20 days every year. During this period, the dust and sludge continuously generated by other processes in the steel plant cannot be timely disposed of, resulting in material backlog and production process interruption. Traditional storage and distribution systems mostly use single silos or temporary storage yards for material temporary storage, with the following limitations: First, the silo capacity is limited and the storage path cannot be flexibly switched, so new generated dust and sludge cannot be continuously received during shutdown. Second, long-term static accumulation of materials is prone to caking, blockage, and even spontaneous combustion risk due to temperature rise. Third, dust leakage is likely to occur in the open conveying and storage links, resulting in prominent environmental protection pressure. Although attempts have been made in the prior art to relieve the contradiction by adding buffer silos or extending the conveying path, the system still relies on manual intervention, has a low degree of automation, and does not form a closed-loop control logic, making it difficult to achieve year-round uninterrupted dynamic management of materials. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a continuous storage and distribution system and control method for rotary hearth furnace raw materials, aiming to solve the problems of dust and sludge backlog, material caking, and environmental protection during the shutdown of the rotary hearth furnace, and to achieve year-round uninterrupted raw material reception and dynamic management.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A continuous storage and distribution system for rotary hearth furnace raw materials, the system includes an ash inlet device, a batching silo, a discharging facility under the silo, a maintenance material warehouse, an ash conveying device at the bottom of the warehouse, a hoist, a distributor, an ash conveying device at the top of the warehouse, an ash conveying device at the top of the silo, a compressed gas supply facility, a dust removal facility, and an electric control system. Among them, the inlet of the ash inlet device is connected to the ash discharge port of the transport vehicle, and the outlet is respectively connected to the batching silo and the maintenance material warehouse; a discharging facility under the silo is provided below the batching silo for metering and outputting materials; the maintenance material warehouse is connected to the inlet of the hoist through the ash conveying device at the bottom of the warehouse, the outlet of the hoist is connected to the distributor, and the outlets of the distributor are respectively connected to the ash conveying device at the top of the warehouse and the ash conveying device at the top of the silo, forming a closed circulating logistics system. The compressed gas supply facility provides gas sources for each device, the dust removal facility is responsible for waste gas purification, and the electric control system realizes full-process automatic control.

[0006] Optionally, the ash feeding device includes an ash conveying pipeline, a wear-resistant elbow, a receiving terminal, an exhaust gas purifier, and a pressure relief valve, and adopts the pneumatic pressure conveying ash removal method. The inlet end of the ash conveying pipeline is connected to the ash discharge port of the transport vehicle, and the outlet end is connected to the inlet of the receiving terminal through a wear-resistant elbow; the receiving terminal is provided with a diversion interface, which is respectively connected to the batching silo and the maintenance material warehouse through branch pipelines; the exhaust gas purifier is installed at the end of the ash conveying pipeline or the pressure release point, and is connected to the dust removal facility through an exhaust pipeline; the pressure relief valve is set at the high-pressure section of the ash conveying pipeline or the compressed gas supply node to adjust the system pressure.

[0007] Optionally, the batching silo is a fully enclosed steel structure silo, the silo body is a cone or a square pyramid, the inclination angle of the cone section is greater than 55°, there is one discharge port under the silo, and the discharging facility under the silo is a metering feeding facility and is equipped with a material level monitoring instrument.

[0008] Optionally, the maintenance material warehouse is a cone or a square pyramid silo body, a pressure relief protection device is provided on the top of the warehouse, the number of discharge ports at the bottom of the warehouse is 1 to 10, and it is connected to the elevator through the ash conveying device at the bottom of the warehouse; the maintenance material warehouse is equipped with a material level monitoring instrument and a material temperature monitoring instrument.

[0009] Optionally, the elevator is an enclosed bucket elevator or a belt elevator, and the conveying capacity is 20t / h to 120t / h.

[0010] Optionally, the distributor is driven by an electro-hydraulic or electric device, and is equipped with an opening monitoring instrument, and the opening adjustment range is 0 to 100%.

[0011] Optionally, the ash conveying devices at the bottom of the warehouse, on the top of the warehouse, and on the top of the silo adopt enclosed air slides, and the conveying capacity is 20t / h to 120t / h.

[0012] Optionally, the compressed gas supply facility uses compressed air or compressed nitrogen as the medium, and the medium pressure is 0.2 to 0.4 MPa.

[0013] A method for continuously storing and distributing raw materials for a rotary hearth furnace, based on the above system, includes the following steps:

[0014] When the rotary hearth furnace production line is running normally, the raw materials enter the batching silo through the ash feeding device, and after being metered by the discharging facility under the silo, they enter the subsequent production process;

[0015] When the rotary hearth furnace production line is shut down for maintenance, the raw materials enter the maintenance material warehouse for storage through the ash feeding device;

[0016] When the rotary hearth furnace resumes production, the materials in the maintenance material warehouse are transported to the batching silo through the ash conveying device at the bottom of the warehouse, the elevator, the distributor, and the ash conveying device on the top of the silo, and enter the subsequent production process through the discharging facility under the silo;

[0017] During the storage period in the maintenance material warehouse, the material circulation mode is started regularly: the material re-enters the maintenance material warehouse through the ash conveying device at the bottom of the warehouse, the elevator, the distributor and the ash conveying device at the top of the warehouse, and the circulation period is 4h to 72h;

[0018] When the temperature of the material in the maintenance material warehouse exceeds 80°C, the material circulation mode is immediately started;

[0019] When the material level in the batching silo or the maintenance material warehouse is too high, the compressed gas supply facility automatically cuts off the gas source.

[0020] Optionally, the electric control system automatically switches the raw material conveying path according to the running state signal of the rotary hearth furnace and controls the opening degree of the distributor to adjust the material flow direction.

[0021] The beneficial effects of the present invention are as follows:

[0022] The continuous storage and distribution system and control method of the raw materials for the rotary hearth furnace provided by the present invention significantly improve the continuity, safety and environmental protection of the dust sludge treatment through innovative structural design and intelligent control logic, which are specifically reflected in the following aspects:

[0023] 1. Uninterrupted material receiving capacity throughout the year

[0024] By setting up a dual-path conveying structure of an independent maintenance material warehouse and a batching silo, the problem of material consumption during the shutdown of the rotary hearth furnace in the traditional process is completely solved. During normal production, the raw materials directly enter the batching silo through the ash inlet device and are supplied to the rotary hearth furnace after metering; during the shutdown for maintenance, the materials are automatically switched to the maintenance material warehouse for storage, and dynamic management is realized through the circulation loop composed of the ash conveying device at the bottom of the warehouse, the elevator and the distributor. This design breaks through the capacity limitation of a single storage unit in the prior art, ensures that there is always a receiving space for the dust sludge generated in the whole process of the steel plant, and avoids the interruption of the supply chain caused by shutdown.

[0025] 2. Intelligent anti-blocking and safety control

[0026] The maintenance material warehouse integrates material temperature monitoring and periodic circulation mechanism: when the temperature in the warehouse exceeds 80°C or the storage time reaches the set threshold, the system automatically starts the material circulation mode, and the material is re-conveyed to the top of the warehouse through the elevator, effectively preventing potential safety hazards caused by caking and local high temperature. In addition, the interlocking control of the pressure relief protection device at the top of the warehouse and the compressed gas supply facility can quickly cut off the gas source when the material level is too high, avoiding the risk of overload. This active safety protection system greatly reduces the frequency of manual inspection and improves the reliability of the system operation.

[0027] 3. Closed environmental protection logistics system

[0028] The entire system adopts pneumatic pressure conveying and enclosed conveying devices (such as air slide, bucket elevator), and coordinates with multi-point waste gas collection and purification of dust removal facilities to minimize the dust leakage rate. The exhaust purifier and pressure relief valve set in the ash inlet device further optimize the gas-solid separation efficiency, ensuring stable air pressure and no secondary pollution during the conveying process. Compared with the traditional open conveying process, this system significantly reduces the negative impact on the factory environment while achieving efficient material transfer, meeting the requirements of strict environmental protection regulations.

[0029] 4. Precise metering and automatic control

[0030] The electronic control system dynamically adjusts the opening of the distributor, the start and stop of the ash conveying device, and the gas supply parameters by real-time monitoring of the material level, temperature, and equipment operating status. For example, when the rotary hearth furnace resumes production, the system can automatically mix and convey the dust sludge stored in the maintenance material warehouse with the newly added raw materials in a preset proportion to ensure the uniformity of the material composition entering the furnace. This closed-loop control logic not only improves the batching accuracy but also reduces the human operation error, doubling the stability and economy of the overall process.

[0031] In summary, through the deep integration of structural innovation and intelligent control, the present invention constructs a full-cycle material management solution adapted to the production characteristics of the rotary hearth furnace, achieving a substantial breakthrough in the prior art in terms of continuity, safety, environmental protection, and automation level, providing an efficient and reliable technical support for the resource utilization of dust sludge in iron and steel enterprises.

[0032] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. Brief description of the drawings

[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0034] Figure 1 is the system diagram of this solution;

[0035] Figure 2 is the operation logic diagram of this solution.

[0036] Reference numerals: 1 ash inlet device, 2 batching silo, 3 discharging facility under the silo, 4 maintenance material warehouse, 5 ash conveying device at the bottom of the warehouse, 6 elevator, 7 distributor, 8 ash conveying device at the top of the warehouse, 9 ash conveying device at the top of the silo, 10 compressed gas supply facility, 11 dust removal facility, 12 electronic control system. Detailed description of the specific implementation

[0037] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0038] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] Please refer to Figures 1 to 2 , the system includes an ash inlet device 1, a batching silo 2, a discharging facility under the silo 3, a maintenance material warehouse 4, an ash conveying device at the bottom of the warehouse 5, a hoist 6, a distributor 7, an ash conveying device at the top of the warehouse 8, an ash conveying device at the top of the silo 9, a compressed gas supply facility 10, a dust removal facility 11 and an electric control system 12. The connection relationship and working process of each component are as follows:

[0041] 1. Ash inlet device 1

[0042] The inlet of the ash inlet device 1 is connected to the ash discharge port of the transport vehicle through a flange or a quick coupling, and the outlet is connected to the tops of the batching silo 2 and the maintenance material warehouse 4 through branch pipelines. Inside the ash inlet device 1, there are ash conveying pipelines, wear-resistant elbows, receiving terminals, exhaust purifiers and pressure relief valves. Among them, the ash conveying pipeline uses pneumatic pressure to convey the dust sludge, and the wear-resistant elbows are arranged at the pipeline turning sections to reduce the impact wear of the materials; the receiving terminal guides the materials to the batching silo 2 or the maintenance material warehouse 4 through a shunt interface; the exhaust purifier is connected to the dust removal facility 11 and is used to treat the dust-containing waste gas generated during the conveying process; the pressure relief valve is set at the high-pressure section of the ash conveying pipeline and is controlled by the electric control system 12 to open and close to adjust the system pressure.

[0043] 2. The batching silo 2 and the discharging facility 3 under the silo

[0044] The batching silo 2 is a fully enclosed steel structure silo, and the silo body is designed as a cone or a square pyramid, the inclination angle of the conical section is greater than 55°, and the storage time of the materials in the silo is 12 - 48 hours. The discharging facility 3 under the silo is installed at the bottom of the batching silo 2, adopts a metering feeding device, and is equipped with a material level monitoring instrument. During normal production, the materials are accurately metered by the discharging facility 3 under the silo and then conveyed to the rotary hearth furnace production process.

[0045] 3. The maintenance material warehouse 4 and the ash conveying device 5 at the bottom of the warehouse

[0046] The maintenance material warehouse 4 is a cone or a square pyramid silo body, there is a pressure relief protection device on the top of the warehouse, and 1 - 10 discharging ports are arranged at the bottom of the warehouse, and all the discharging ports are connected to the ash conveying device 5 at the bottom of the warehouse. The maintenance material warehouse 4 is equipped with a material level monitoring instrument and a material temperature monitoring instrument, and the storage time is 3 - 20 days. The ash conveying device 5 at the bottom of the warehouse adopts a closed air chute, and the conveying capacity is 20 - 120 t / h, and conveys the materials from the maintenance material warehouse 4 to the inlet of the elevator 6.

[0047] 4. The elevator 6 and the distributor 7

[0048] The elevator 6 is a closed bucket type or belt type elevator, and the conveying capacity is 20 - 120 t / h. Its inlet is connected to the ash conveying device 5 at the bottom of the warehouse, and the outlet is connected to the distributor 7. The distributor 7 adopts an electro-hydraulic or electric drive device, is equipped with an opening monitoring instrument, and can adjust the material flow direction to the ash conveying device 8 on the top of the warehouse or the ash conveying device 9 on the top of the silo.

[0049] 5. The ash conveying device 8 on the top of the warehouse and the ash conveying device 9 on the top of the silo

[0050] The ash conveying device 8 on the top of the warehouse is connected to the outlet of the distributor 7 and the top of the maintenance material warehouse 4, and the ash conveying device 9 on the top of the silo is connected to the outlet of the distributor 7 and the top of the batching silo 2. Both of them adopt closed air chutes, and the conveying capacity is 20 - 120 t / h, realizing the recycling or supplementary supply of the materials.

[0051] 6. Compressed Gas Supply Facility 10 and Dust Removal Facility 11

[0052] The compressed gas supply facility 10 provides compressed air or nitrogen for each device in the system, and the medium pressure is 0.2 - 0.4 MPa. The dust removal facility 11 is connected to the dust generating points such as the ash feeding device 1, the batching silo 2, and the maintenance material warehouse 4 through pipelines, and collects and purifies the waste gas before discharging it.

[0053] 7. Electric Control System 12

[0054] The electric control system 12 integrates a PLC or DCS control module, real-time monitors the material level, temperature, the opening degree of the diverter, and the operating status of the equipment, and executes the following control logic:

[0055] Normal production mode: The raw materials directly enter the batching silo 2 through the ash feeding device 1, and are metered by the discharging facility 3 under the silo and then transported to the rotary hearth furnace.

[0056] Shutdown and maintenance mode: The raw materials are switched to be stored in the maintenance material warehouse 4. After resuming production, the materials enter the batching silo 2 through the ash conveying device 5 at the bottom of the warehouse, the elevator 6, the diverter 7, and the ash conveying device 9 at the top of the silo.

[0057] Material circulation mode: When the materials in the maintenance material warehouse 4 are regularly (4 - 72 hours) or when the temperature exceeds 80°C, they are re-circulated back to the warehouse through the ash conveying device 5 at the bottom of the warehouse, the elevator 6, the diverter 7, and the ash conveying device 8 at the top of the warehouse to prevent caking.

[0058] Safety interlock: When the material level is too high or the temperature is abnormal, the compressed gas supply is automatically cut off and an alarm is given.

[0059] Example of the implementation process: When the rotary hearth furnace is operating normally, the dust sludge enters the batching silo 2 through the ash feeding device 1, and is metered and supplied for production; during shutdown and maintenance, the dust sludge is changed to be stored in the maintenance material warehouse 4, and the electric control system 12 regularly starts the material circulation to prevent caking; after resuming production, the stored dust sludge is back-fed to the batching silo 2 through a closed-loop path and mixed with the newly added raw materials and fed into the furnace. During the whole process, the dust removal facility 11 purifies the waste gas in real time, the compressed gas supply facility 10 ensures the conveying power, and the electric control system 12 ensures the full-process automatic operation.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A continuous raw material storage and distribution system for a rotary hearth furnace, characterized in that, Comprising: Ash inlet device (1), batching silo (2), under-silo discharging facility (3), maintenance material storage (4), ash conveying device at the bottom of the storage (5), elevator (6), distributor (7), ash conveying device at the top of the storage (8), ash conveying device at the top of the silo (9), compressed gas supply facility (10), dust removal facility (11) and electric control system (12); The inlet of the ash inlet device (1) is connected to the ash discharge port of the transport vehicle, and its outlet is respectively connected to the batching silo (2) and the maintenance material storage (4); The under-silo discharging facility (3) is arranged below the batching silo (2); The maintenance material storage (4) is connected to the inlet of the elevator (6) through the ash conveying device at the bottom of the storage (5), and the outlet of the elevator (6) is connected to the distributor (7); The outlets of the distributor (7) are respectively connected to the ash conveying device at the top of the storage (8) and the ash conveying device at the top of the silo (9); The ash conveying device at the top of the storage (8) is connected to the maintenance material storage (4), and the ash conveying device at the top of the silo (9) is connected to the batching silo (2), thus forming a closed logistics system; The compressed gas supply facility (10) provides gas sources for the ash inlet device (1), batching silo (2), maintenance material storage (4), ash conveying device at the bottom of the storage (5), ash conveying device at the top of the storage (8), ash conveying device at the top of the silo (9) and the dust removal facility (11); The dust removal facility (11) is connected to each dust generating point in the system for waste gas collection and purification; The electric control system (12) is signal-connected to each device for monitoring and controlling the automatic operation of the system.

2. The rotary hearth furnace raw material continuous storage and distribution system according to claim 1, characterized in that: The ash inlet device (1) includes an ash conveying pipeline, wear-resistant elbows, a receiving terminal, an exhaust purifier and a pressure relief valve, and adopts the pneumatic pressure conveying ash removal method; The inlet end of the ash conveying pipeline is connected to the ash discharge port of the transport vehicle, and the outlet end is connected to the inlet of the receiving terminal through a wear-resistant elbow; The receiving terminal is provided with a shunt interface, which is respectively connected to the batching silo (2) and the maintenance material storage (4) through branch pipelines; The exhaust purifier is installed at the end of the ash conveying pipeline or the pressure release point and is connected to the dust removal facility (11) through an exhaust pipeline; The pressure relief valve is arranged at the high-pressure section of the ash conveying pipeline or the compressed gas supply node for regulating the system pressure.

3. The rotary hearth furnace raw material continuous storage and distribution system according to claim 1, characterized in that: The batching silo (2) is a fully enclosed steel structure silo, the silo body is a cone or a square pyramid, the inclination angle of the conical section > 55°, there is one under-silo discharge port, and the under-silo discharging facility (3) is a metering and feeding facility and is equipped with a material level monitoring instrument.

4. The rotary hearth furnace raw material continuous storage and distribution system according to claim 1, characterized in that: The maintenance material storage (4) is a conical or square pyramid silo body, a pressure relief protection device is provided on the top of the storage, the number of bottom discharge ports is 1 - 10, and it is connected to the elevator (6) through the ash conveying device at the bottom of the storage (5); the maintenance material storage (4) is equipped with a material level monitoring instrument and a material temperature monitoring instrument.

5. The rotary hearth furnace raw material continuous storage and distribution system according to claim 1, characterized in that: The elevator (6) is an enclosed bucket elevator or a belt elevator, with a conveying capacity of 20 t / h to 120 t / h.

6. The continuous raw material storage and distribution system for a rotary hearth furnace according to claim 1, characterized in that: The distributor (7) is driven by an electro-hydraulic or electric device and is equipped with an opening monitoring instrument, and the opening adjustment range is 0 to 100%.

7. The continuous raw material storage and distribution system for a rotary hearth furnace according to claim 1, characterized in that: The ash conveying device (5) at the bottom of the silo, the ash conveying device (8) at the top of the silo and the ash conveying device (9) at the top of the bin adopt an enclosed air chute, and the conveying capacity is 20 t / h to 120 t / h.

8. The continuous raw material storage and distribution system for a rotary hearth furnace according to claim 1, characterized in that: The compressed gas supply facility (10) uses compressed air or compressed nitrogen as the medium, and the medium pressure is 0.2 to 0.4 MPa.

9. A continuous storage and distribution control method for the raw materials of a rotary hearth furnace, based on the system according to any one of claims 1 to 8, characterized in that, It includes the following steps: When the rotary hearth furnace production line is running normally, the raw materials enter the batching silo (2) through the ash inlet device (1), and after being metered by the discharging facility (3) under the silo, they enter the subsequent production process; When the rotary hearth furnace production line is shut down for maintenance, the raw materials enter the maintenance material storage (4) through the ash inlet device (1) for storage; When the rotary hearth furnace resumes production, the materials in the maintenance material storage (4) are transported to the batching silo (2) through the ash conveying device (5) at the bottom of the silo, the elevator (6), the distributor (7) and the ash conveying device (9) at the top of the bin, and enter the subsequent production process through the discharging facility (3) under the silo; During the storage period of the maintenance material storage (4), the material circulation mode is started regularly: the materials re-enter the maintenance material storage (4) through the ash conveying device (5) at the bottom of the silo, the elevator (6), the distributor (7) and the ash conveying device (8) at the top of the silo, and the circulation period is 4 h to 72 h; When the temperature of the materials in the maintenance material storage (4) exceeds 80 °C, the material circulation mode is immediately started; When the material level in the batching silo (2) or the maintenance material storage (4) is too high, the compressed gas supply facility (10) automatically cuts off the gas source.

10. The control method according to claim 9, characterized in that: The electric control system (12) automatically switches the raw material conveying path according to the operation status signal of the rotary hearth furnace and controls the opening of the distributor (7) to adjust the material flow direction.

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