Blast furnace uniform blowing and local strengthening control system and method

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and discloses a blast furnace uniform blowing and local strengthening control system and method. The pressure and flow monitoring sensors are arranged on each hot air branch pipe, the actual pressure and flow data of each branch pipe can be collected in real time, centralized processing and comparison are conducted through the control unit, and the blast compensation needed by each air opening is accurately calculated in combination with the dynamic deviation of the target value and the minimum value. Local strengthening control can be carried out on part of tuyeres according to the production requirement of a blast furnace, the control unit can flexibly adjust the opening degree of some flow adjusting valves according to the real-time production process requirement, the blast volume of the specific tuyeres is enhanced or weakened, process disturbance such as raw material fluctuation and equipment maintenance is effectively coped with, and the production efficiency is improved. And the flexibility and the intelligent level of blast furnace operation are improved.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace ironmaking technology, specifically relating to a control system and method for uniform blast furnace blowing and localized strengthening. Background Technology

[0002] Currently, the blast furnace blast system, consisting of a blower, hot blast stove, hot blast main pipe, and hot blast surround pipe, operates through the following process: Cold air is pressurized by the blower, heated to approximately 1200°C by the hot blast stove, and then enters the hot blast main pipe. The hot air is then transmitted through the hot blast main pipe into the hot blast surround pipe, and through evenly distributed openings along the circumference of the surround pipe into the hot blast branch pipes. Finally, it is blown into the hearth through the tuyeres of each branch pipe. After entering the blast furnace from the tuyeres, the hot air in the branch pipes reacts with pulverized coal and coke to form a swirling combustion zone, which is the energy source for the entire blast furnace production. The size and distribution of the swirling combustion zone are directly related to the kinetic energy of the hot air at each tuyer, further affecting the airflow distribution within the blast furnace, the balanced descent of the burden, and the dripping of molten slag and iron. This plays a crucial role in ensuring the continuous, stable, and smooth operation of the entire blast furnace smelting process.

[0003] Due to the differences in the relative positions between the main hot blast duct and each tuyer, the distance and direction of hot air entering each branch duct vary, resulting in significant unevenness in blast parameters such as air volume, air pressure, and blast kinetic energy. This makes it difficult to achieve uniform development of the combustion zone. Therefore, in industrial production, blast furnace conditions are often adjusted by modifying the diameter or length of individual tuyeres or by blocking some tuyeres.

[0004] Existing adjustment methods, such as adjusting the size and length of tuyeres, have low precision, making it difficult to achieve minute and precise changes. This can easily lead to over-adjustment, affecting overall operational efficiency. Furthermore, the adjustment of tuyere size and length is physically limited; tuyeres cannot be infinitely reduced or extended, otherwise, the stability of the airflow and the volume of air volume will be affected. In addition, due to the large size and high system inertia of blast furnaces, the effects of adjustment measures often take a considerable amount of time to manifest within the furnace. This lag makes real-time adjustment difficult, potentially leading to over- or under-adjustment. Moreover, most adjustments in production still rely on the experience and judgment of operators; the uncertainty and subjectivity of manual operation affect the accuracy and timeliness of adjustments. Currently, some blast furnaces still lack sufficient sensors and advanced data analysis tools, resulting in insufficient information for adjustment measures. Furthermore, model calculations and a review of numerous literature studies have revealed that, with a fixed total blast parameters, reducing the blast parameters of any one tuyere increases the blast parameters of all other tuyeres to varying degrees, and vice versa. Therefore, methods that adjust overall blast uniformity by controlling a single tuyere whose blast parameter deviates from the average are difficult to implement.

[0005] Given the limitations of the above-mentioned air outlet adjustment methods, it is necessary to propose a blower control method. In order to bring the blower parameters of a certain air outlet closer to the uniform parameters, the valve openings of all other air outlets should be adjusted in a coordinated manner multiple times to control the flow rate changes. That is, the blower uniformity is achieved by locally strengthening the air outlet with the worst uniformity. Summary of the Invention

[0006] The purpose of this invention is to overcome the problem of inconsistent air volume at each tuyeres caused by the design of the hot blast duct structure, and to provide a control system and method for uniform blasting and localized enhanced blasting in a blast furnace.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a blast furnace uniform blasting and localized intensification control system, comprising a hot blast duct connected to a hot blast main duct, and several hot blast branch ducts arranged below the hot blast duct. Each hot blast branch duct is equipped with a pressure monitoring sensor and a flow monitoring sensor. A flow regulating valve is arranged downstream of the pressure monitoring sensor and the flow monitoring sensor. The pressure monitoring sensor, the flow monitoring sensor, and the flow regulating valve are all connected to a control unit. The control unit is used to collect data from the pressure monitoring sensor and the flow monitoring sensor, and construct a valve body control function based on the deviation from the target value and the minimum value. The control unit controls the opening degree of the corresponding flow regulating valve according to the valve body control function.

[0008] A further improvement of this invention is that both the pressure monitoring sensor and the flow monitoring sensor are passive mass sensing flow meters.

[0009] A further improvement of the present invention is that both the pressure monitoring sensor and the flow monitoring sensor are inserted into the corresponding hot air branch pipe, so that the acquisition ends of the pressure monitoring sensor and the flow monitoring sensor are placed inside the hot air branch pipe.

[0010] A further improvement of the present invention is that the pressure monitoring sensor, the flow monitoring sensor and the flow regulating valve form an integrated measurement and control valve. The inner layer of the integrated measurement and control valve is a ceramic fiber heat insulation layer with a thermal conductivity ≤0.15W / (m·K). The valve core of the integrated measurement and control valve is made of 995 alumina ceramic material. A valve sleeve is provided between the valve stem and the valve core of the integrated measurement and control valve.

[0011] A further improvement of the present invention is that the measurement accuracy of the pressure monitoring sensor and the flow monitoring sensor is higher than 0.1%, the repeatability is higher than 0.1%, and the control accuracy of the flow regulating valve is higher than 0.1%.

[0012] Secondly, the present invention provides a method for controlling uniform blast furnace blasting and localized intensification, comprising the following steps: Step 1: In the initial state, set the opening of the flow regulating valves on all hot air branch pipes to the maximum; Step 2: Continuously collect the pressure and flow rate of each hot air branch pipe as the blower parameters for the hot air branch pipe; Step 3: Based on the deviation of the blast parameters of each hot blast branch pipe from the average and minimum values, construct the valve body control function. While controlling the uniform blast of the blast furnace through the valve body control function, reduce the damping of the hot blast system by adopting the control parameter system with the largest overall valve opening. Step 4: Within one adjustment cycle, input the blower parameters of each hot air branch into the valve control function, calculate the valve opening value of each hot air branch, and form a set of dynamic valve opening parameters for all hot air branches. Step 5: Within one adjustment cycle, based on the specific data of the valve dynamic opening parameter set of all hot air branch pipes, complete the opening adjustment of the flow regulating valve, and continuously collect the pressure and flow of each hot air branch pipe to obtain the adjusted blower parameters of each hot air branch pipe. Step 6: Using the adjusted blast parameters for each hot blast branch pipe, repeat steps 4 and 5 to continuously enter the next adjustment cycle and gradually achieve dynamic and uniform adjustment of blast furnace blast.

[0013] A further improvement of this invention is that, within a specific time period, when it is necessary to locally enhance the blasting of a target hot blast branch pipe, the target value of the blasting parameters of the target hot blast branch pipe is used to replace the average value, and the average value of the blasting parameters of the remaining hot blast branch pipes is recalculated. Based on the requirements of the target value of the blasting parameters of the specific tuyeres and the average value of the blasting parameters of the remaining tuyeres, the dynamic opening parameter set of the valve body is calculated, and the opening of the flow regulating valve is adjusted within the specific time period based on this. Under the premise of ensuring the uniformity of the blasting parameters of the remaining tuyeres, the local enhancement of the blasting of the target hot blast branch pipe is completed. After the enhancement period ends, the fourth, fifth and sixth steps are repeated in the next adjustment period to restore the dynamic uniform adjustment mechanism of the blast furnace blasting.

[0014] A further improvement of this invention is that the valve body control function is:

[0015] in, For the first The opening value of the flow regulating valve for each hot air branch pipe. The minimum value for the blower parameter among all hot air branch pipes. Average values ​​of blower parameters for all hot air branch pipes For the first Blower parameters for each hot air branch pipe; The valve body control parameters are determined by the deviation between the minimum and average values ​​of the blower parameters for the hot air branch pipe. For the first The valve body control parameters are determined by the deviation between the blower parameters and the minimum value of each hot air branch pipe. This is the valve body uniform adjustment function.

[0016] A further improvement of the present invention is that, The expression is as follows:

[0017] in, This refers to the overall control coefficient for valve body adjustment.

[0018] A further improvement of the present invention is that, The expression is as follows:

[0019] in, This refers to the individual control coefficient for valve body adjustment.

[0020] A further improvement of this invention is that the valve body uniform adjustment function is as follows:

[0021] in, For the valve body uniform adjustment function, For valve body opening adjustment step size, This refers to the valve body adjustment cycle.

[0022] Compared with the prior art, the present invention has the following beneficial effects: This invention, by deploying pressure and flow monitoring sensors on each hot blast branch pipe, can collect real-time actual pressure and flow data for each branch pipe. The data is then centrally processed and compared by the control unit, and combined with the dynamic deviation between target and minimum values ​​to accurately calculate the required blast compensation for each tuyer. This invention can implement localized enhanced control of certain tuyeres according to blast furnace production needs. The control unit can flexibly adjust the opening of certain flow regulating valves according to real-time production process requirements, thereby increasing or decreasing the blast volume at specific tuyeres. This effectively addresses process disturbances such as raw material fluctuations and equipment maintenance, improving the flexibility and intelligence of blast furnace operation. This invention employs a dual-sensor configuration based on pressure and flow sensors, combined with automatic regulating valves, to achieve fully automatic closed-loop feedback regulation. When the flow rate at a certain tuyer is detected to be lower than the target value, the control unit automatically increases the opening of the regulating valve for that path; conversely, it closes it, thus proactively correcting local flow imbalances caused by structural, aging, and ash accumulation factors, ensuring the entire system is always in optimal operating condition, and achieving automatic data collection, recording, and fault alarm. When encountering abnormal fluctuations, the system can respond promptly and adjust automatically, eliminating the need for frequent manual inspections and adjustments, greatly reducing maintenance difficulty and labor costs, and improving system stability and security. The precise and balanced tuyeres airflow of this invention optimizes the airflow distribution within the blast furnace, promotes full reaction and combustion of fuel and raw materials, reduces the risk of localized high temperatures and tuyeres bridging, effectively reduces furnace lining damage caused by uneven tuyeres, extends blast furnace life, and improves smelting efficiency and energy conservation. In the initial state, the flow regulating valves on all hot blast branch pipes of this invention are set to their maximum opening. While uniformly controlling the blast furnace blast, the invention employs a control parameter system with the overall valve body opening at its maximum to reduce the damping of the hot blast system, increase the blast energy at the tuyeres, and enhance the central reaction activity of the blast furnace. This invention achieves a reduction in the blast parameters of the target hot blast branch pipe by decreasing the opening of the flow regulating valves on the target hot blast branch pipe and an increase in the opening of the flow regulating valves on other hot blast branch pipes. In summary, the invention achieves precise and balanced distribution and localized enhanced control of the blast volume at each tuyer in the blast furnace by implementing real-time monitoring and independent adjustment of the pressure and flow rate of each hot blast branch pipe. This overcomes the problem of uneven blast caused by the traditional hot blast casing structure design and has significant beneficial effects such as high adjustment accuracy, high level of intelligence, stable operation, convenient maintenance and strong adaptability, effectively improving the smelting process level and production economic benefits of the blast furnace. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the blast furnace hot blast casing structure in this invention; Figure 2 This is a schematic diagram of the integrated measurement and control valve in this invention; Figure 3 This is a schematic diagram of the uniform blower control system in this invention; The components include: 1. Hot air main duct; 2. Hot air surrounding duct; 3. Hot air branch duct; 4. Air outlet; 5. Pressure monitoring sensor; 6. Flow monitoring sensor; 7. Flow regulating valve; 8. First data line; 9. Second data line; 10. Power cord. Detailed Implementation

[0024] To further understand the content of this invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0025] See Figure 1 and Figure 2 A blast furnace uniform blasting and localized intensification control system includes a hot blast duct 2, which is connected to a hot blast main duct 1. Several hot blast branch ducts 3 are installed below the hot blast duct 2. Each hot blast branch duct 3 is equipped with a pressure monitoring sensor 5 and a flow monitoring sensor 6. A flow regulating valve 7 is installed downstream of the pressure monitoring sensor 5 and the flow monitoring sensor 6. The pressure monitoring sensor 5, the flow monitoring sensor 6, and the flow regulating valve 7 are all connected to a control unit 11. The control unit 11 is used to collect data from the pressure monitoring sensor 5 and the flow monitoring sensor 6, and to construct a valve body control function based on the deviation from the target value and the minimum value. The control unit 11 controls the opening degree of the corresponding flow regulating valve 7 according to the valve body control function.

[0026] A method for controlling uniform blast and localized intensification in a blast furnace includes the following steps: Step 1: In the initial state, set the opening of the flow regulating valve 7 on all hot air branch pipes 3 to the maximum; Step 2: Continuously collect the pressure and flow rate of each hot air branch pipe 3 as the blower parameters of the hot air branch pipe 3; Step 3: Based on the deviation of the blast parameters of each hot blast branch pipe 3 from the average and minimum values, construct the valve body control function. While controlling the uniform blast of the blast furnace through the valve body control function, reduce the damping of the hot blast system by adopting the control parameter system with the largest overall valve opening. Step 4: Within one adjustment cycle, input the blower parameters of each hot air branch pipe 3 into the valve body control function, calculate the valve body opening value of each hot air branch pipe 3, and form a set of dynamic valve body opening parameters for all hot air branch pipes 3. Step 5: Within one adjustment cycle, based on the specific data of the valve body dynamic opening parameter set of all hot air branch pipes 3, complete the opening regulation of the flow regulating valve 7, and continuously collect the pressure and flow of each hot air branch pipe 3 to obtain the adjusted blower parameters of each hot air branch pipe 3. Step 6: Using the adjusted blast parameters for each hot blast branch pipe, repeat steps 4 and 5 to continuously enter the next adjustment cycle and gradually achieve dynamic and uniform adjustment of blast furnace blast.

[0027] Within a specific time period, when it is necessary to locally enhance the blasting control of a target hot blast branch pipe 3, the target value of the blasting parameter enhancement of the target hot blast branch pipe 3 is used to replace the average value, and the average value of the blasting parameters of the remaining hot blast branch pipes 3 is recalculated. Based on the requirements of the target value of the blasting parameter enhancement of the specific tuyeres and the average value of the blasting parameters of the remaining tuyeres, the dynamic opening parameter set of the valve body is calculated, and the opening regulation of the flow regulating valve 7 is completed within the specific time period. Under the premise of ensuring the uniformity of the blasting parameters of the remaining tuyeres, the local enhancement of the blasting of the target hot blast branch pipe 3 is completed. After the enhancement period ends, in the next adjustment period, the operations of steps four, five and six are repeated to restore the dynamic uniform adjustment mechanism of the blast furnace blasting.

[0028] Example 1: Both pressure monitoring sensor 5 and flow monitoring sensor 6 employ passive mass sensing flow meters. Without altering the blower system, these devices, based on AC charge induction technology, achieve real-time, accurate measurement of the hot air delivery process in the hot air branch pipe 3, with a measurement accuracy better than 0.1% and a repeatability of 0.1%. This precise measurement provides a solid data foundation for subsequent automated adjustments, enabling the control unit to adjust the flow regulating valve more sensitively and accurately, further improving blower uniformity and the effectiveness of localized enhanced control. The passive design of pressure monitoring sensor 5 and flow monitoring sensor 6 eliminates the need for external power supply and allows for direct insertion into the hot air branch pipe. This eliminates the need for complex modifications, diversions, or cutoffs to the existing piping, allowing for direct addition or replacement of existing blower systems. This low-cost, non-destructive upgrade effectively minimizes the impact on production operations. Both pressure monitoring sensor 5 and flow monitoring sensor 6 are inserted into their corresponding hot blast branch pipes 3, placing their acquisition ends inside the branch pipes. This design incorporates high-temperature resistant, oxidation-resistant, and durable materials and structures, enabling them to withstand the long-term corrosion from the high temperatures, oxygen-containing atmosphere, and complex chemical environment inside the blast furnace hot blast branch pipes. This significantly extends the service life of the sensors and flow meters, reduces maintenance and replacement frequency, and ensures system stability and economy.

[0029] Example 2: The flow regulating valve 7 has a continuous dynamic airflow regulation function. It can dynamically adjust the opening of the flow regulating valve 7 according to the flow rate. Based on real-time monitoring feedback from pressure monitoring sensor 5 and flow monitoring sensor 6, it monitors the flow rate changes after adjustment by the flow regulating valve 7. By repeatedly correcting the opening of the flow regulating valve 7, it aims to achieve equal flow rates in all branch pipes. Its flow regulation range is 60-100%, and its flow control accuracy is within 1%. It adopts a fieldbus control method. The automatic flow regulating valve should have a high-temperature resistant, oxidation-resistant, and durable structure and material design. Optional materials include, but are not limited to, high-temperature alloy steel and carbon steel.

[0030] Example 3: This embodiment further defines the valve body control function, as follows: The valve body control function is:

[0031] in, For the first The opening value of the flow regulating valve for each hot air branch pipe. The minimum value for the blower parameter among all hot air branch pipes. Average values ​​of blower parameters for all hot air branch pipes For the first The blower parameters of each hot air branch pipe; The valve body control parameters are determined by the deviation between the minimum and average values ​​of the blower parameters of the hot air branch pipe; For the first The valve body control parameters are determined by the deviation between the blower parameters and the minimum value of each hot air branch pipe. This is the valve body uniform adjustment function.

[0032] The expression is as follows:

[0033] in, This refers to the overall control coefficient for valve body adjustment.

[0034] The expression is as follows:

[0035] in, This refers to the individual control coefficient for valve body adjustment.

[0036] The valve body uniform adjustment function is as follows:

[0037] in, For the valve body uniform adjustment function, For valve body opening adjustment step size, This refers to the valve body adjustment cycle.

[0038] To minimize resistance loss during hot air delivery, all valves should be initially opened to 100%. Aiming for uniform blower parameters across all vents, and considering the interconnected changes in all blower parameters, to increase the blower parameter of a particular vent (where the valve opening is already 100%, so further increase is impossible), the valve openings of all other vents should be appropriately reduced. This is achieved by decreasing the blower parameters of other vents to increase the specific vent's blower parameter. Conversely, to reduce the blower parameter of a particular vent, its valve opening should be reduced directly. In other words, using the vent with the lowest blower parameter as a control group, reducing the valve openings of all other vents is necessary to achieve uniform blower flow. Furthermore, since the deviations of the blower parameters from the average and minimum values ​​vary for each vent, a valve control function should be constructed based on these different deviations to enable rapid adjustment of all vent parameters. This will allow for a fast valve response.

[0039] Example 4: The working method of this invention is as follows: After hot air enters the hot air duct 2 from the hot air main duct 1, it splits into two airflows at the connection between the hot air main duct 1 and the hot air duct 2, respectively entering each hot air branch duct 3 along the circumference of the hot air duct 2, and finally being blown into the blast furnace from each tuyeres 4. When the hot air passes through the pressure monitoring sensor 5 and the flow monitoring sensor 6 installed on the hot air branch duct 3, the pressure sensor 5 and the flow monitoring sensor 6 on each hot air branch duct 3 will monitor the pressure and flow data of the hot air flowing through each hot air branch duct 3 in real time, and transmit them back to the main control system 11 through the first data line 8 and the second data line 9. The data processing unit calculates the difference between the flow rate of each branch duct and the average flow rate. Based on the magnitude of the difference, the main control system 11 adopts an integrated valve body coordinated control strategy, and automatically drives the coordinated adjustment of the opening of the flow regulating valve 7 on each hot air branch duct through the power line 10, thereby ensuring that the hot air flow rate of each branch duct is uniform. During the adjustment process, the system will continuously collect real-time flow data and dynamically adjust the opening of the regulating valve 7 according to the flow rate change until the flow rate of each branch duct tends to be uniform.

[0040] This embodiment installs pressure and flow sensors on each hot blast branch pipe and monitors the actual flow and pressure of each branch pipe in real time. The main control system acquires and analyzes the flow data of each branch pipe in real time, enabling dynamic and accurate identification of flow deviations. Relying on an integrated valve body collaborative control strategy, it automatically adjusts the opening of the valves in each branch pipe, achieving closed-loop automatic adjustment throughout the entire process. This fundamentally ensures the uniformity of the blast volume at each tuyeres, significantly reducing uneven air volume distribution caused by structural or operational fluctuations. Through precise and balanced air volume control, the airflow distribution at each tuyer in the blast furnace becomes more rational, reducing the risks of localized high temperatures, bridging, and tuyere burnout. This helps improve the reaction conditions inside the furnace, increase fuel utilization, extend the blast furnace life, and reduce the failure rate and maintenance costs, thereby enhancing the safety and economic benefits of blast furnace operation. Uniform and precise air volume control makes the temperature and airflow field distribution inside the blast furnace more ideal, promoting full reaction of raw materials and fuels, improving smelting efficiency and molten iron quality. At the same time, it facilitates automatic switching between multiple operating conditions and localized tuyere strengthening, further optimizing blast furnace process parameters and improving the stability and yield of the final product.

[0041] This invention utilizes integrated monitoring and control valves installed on each branch pipe of the blast furnace hot blast manifold. Under the principle of minimizing pressure loss in the hot blast branch pipes (i.e., the valve opening is at its maximum by default), multiple coordinated controls achieve rapid valve response, ultimately resulting in uniform flow at each tuyeres along the circumference. The system includes a real-time monitoring unit for hot blast branch pipe blast parameters, a data processing unit, flow regulating valves, and their opening control units. Through real-time monitoring and automatic adjustment, this invention improves the accuracy of blast control, promotes balanced combustion development within the blast furnace, and optimizes the stability and efficiency of blast furnace production.

[0042] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A blast furnace uniform blast and localized intensification control system, characterized in that, The system includes a hot air duct (2), which is connected to a hot air main duct (1). Several hot air branch pipes (3) are installed under the hot air duct (2). Each hot air branch pipe (3) is equipped with a pressure monitoring sensor (5) and a flow monitoring sensor (6). A flow regulating valve (7) is installed downstream of the pressure monitoring sensor (5) and the flow monitoring sensor (6). The pressure monitoring sensor (5), the flow monitoring sensor (6) and the flow regulating valve (7) are all connected to a control unit (11). The control unit (11) is used to collect data from the pressure monitoring sensor (5) and the flow monitoring sensor (6) and construct a valve body control function based on the deviation from the target value and the minimum value. The control unit controls the opening degree of the corresponding flow regulating valve (7) according to the valve body control function.

2. The method for controlling uniform blast furnace blasting and localized intensification according to claim 1, characterized in that, The pressure monitoring sensor (5) and the flow monitoring sensor (6) are both inserted into the corresponding hot air branch pipe (3), so that the acquisition ends of the pressure monitoring sensor (5) and the flow monitoring sensor (6) are placed inside the hot air branch pipe (3).

3. The method for controlling uniform blast furnace blasting and localized intensification according to claim 1, characterized in that, The pressure monitoring sensor (5), flow monitoring sensor (6) and flow regulating valve (7) form a measurement and control integrated valve. The inner layer of the measurement and control integrated valve is a ceramic fiber heat insulation layer with a thermal conductivity of ≤0.15W / (m·K). The valve core of the measurement and control integrated valve is made of 995 alumina ceramic material. A valve sleeve is provided between the valve stem and the valve core of the measurement and control integrated valve.

4. The method for controlling uniform blast furnace blasting and localized intensification according to claim 1, characterized in that, The pressure monitoring sensor (5) and the flow monitoring sensor (6) have a measurement accuracy of over 0.1% and a repeatability of over 0.1%, and the flow regulating valve (7) has a control accuracy of over 0.1%.

5. A method for controlling uniform blast furnace blasting and localized intensification, characterized in that, Includes the following steps: Step 1: In the initial state, set the opening of the flow regulating valve (7) on all hot air branch pipes (3) to the maximum; Step 2: Continuously collect the pressure and flow rate of each hot air branch pipe (3) as the blower parameters of the hot air branch pipe (3); Step 3: Based on the deviation of the blast parameters of each hot blast branch pipe (3) from the average and minimum values, construct the valve body control function. While controlling the uniform blast of the blast furnace through the valve body control function, reduce the damping of the hot blast system by using the control parameter system with the largest overall valve body opening. Step 4: Within one adjustment cycle, the blower parameters of each hot air branch pipe (3) are input into the valve body control function to calculate the valve body opening value of each hot air branch pipe (3) and form a set of valve body dynamic opening parameters for all hot air branch pipes (3); Step 5: Within an adjustment cycle, based on the specific data of the valve body dynamic opening parameter set of all hot air branch pipes (3), complete the opening regulation of the flow regulating valve (7), and continuously collect the pressure and flow of each hot air branch pipe (3) to obtain the adjusted blower parameters of each hot air branch pipe (3). Step 6: Using the adjusted blast parameters of each hot blast branch pipe (3), repeat the operations of Step 4 and Step 5, continuously enter the next adjustment cycle, and gradually realize the dynamic and uniform adjustment of blast furnace blast.

6. The method for controlling uniform blast furnace blasting and localized intensification according to claim 5, characterized in that, Within a specific time period, when it is necessary to locally strengthen the blasting of a target hot blast branch pipe (3), the target value of the blasting parameter of the target hot blast branch pipe (3) is used to replace the average value, and the average value of the blasting parameter of the remaining hot blast branch pipe (3) is recalculated. Based on the requirements of the target value of the blasting parameter of the specific tuyere and the average value of the blasting parameter of the remaining tuyere, the dynamic opening parameter set of the valve body is calculated, and the opening regulation of the flow regulating valve (7) is completed within the specific time period. Under the premise of ensuring the uniformity of the blasting parameter of the remaining tuyere, the local strengthening of the blasting of the target hot blast branch pipe (3) is completed. After the strengthening cycle ends, the fourth, fifth and sixth steps are repeated in the next adjustment cycle to restore the dynamic uniform adjustment mechanism of the blast furnace blasting.

7. The method for controlling uniform blast furnace blasting and localized intensification according to claim 5, characterized in that, The valve body control function is: in, For the first The opening value of the flow regulating valve for each hot air branch pipe. The minimum value for the blower parameter among all hot air branch pipes. Average values ​​of blower parameters for all hot air branch pipes For the first Blower parameters for each hot air branch pipe; The valve body control parameters are determined by the deviation between the minimum and average values ​​of the blower parameters of the hot air branch pipe; For the first The valve body control parameters are determined by the deviation between the blower parameters and the minimum value of each hot air branch pipe. This is the valve body uniform adjustment function.

8. The method for controlling uniform blast furnace blasting and localized intensification according to claim 7, characterized in that, The expression is as follows: in, This refers to the overall control coefficient for valve body adjustment.

9. The method for controlling uniform blast and localized intensification in a blast furnace according to claim 7, characterized in that, The expression is as follows: in, This refers to the individual control coefficient for valve body adjustment.

10. The method for controlling uniform blast furnace blasting and localized intensification according to claim 7, characterized in that, The valve body uniform adjustment function is as follows: in, For the valve body uniform adjustment function, For valve body opening adjustment step size, This refers to the valve body adjustment cycle.

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