A method and system for stabilizing the pressure of hot blast stove change

Abstract

The present application belongs to the technical field of blast furnace smelting, and specifically discloses a hot blast stove blast pressure stability control system, which comprises a responsibility control module, a blast pressure adjusting module, a valve monitoring module, a collaborative communication module, a stove condition early warning module, a hidden danger management module and an emergency treatment module. Organic combination of the above modules makes the blast pressure control in the whole stove changing process no longer rely on pure artificial experience, but be assisted or even dominated by an intelligent system, thereby effectively avoiding the blast pressure fluctuation caused by human factors and significantly improving the stove changing efficiency and the stability of blast furnace production.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting technology, and in particular to a method and system for stabilizing the blast pressure during hot blast stove replacement. Background Technology

[0002] In blast furnace smelting production, hot blast stove replacement is a core link in maintaining continuous blast, and its air pressure stability directly affects hot blast heat exchange efficiency, blast continuity, and stable blast furnace operation. However, in actual production, especially when using special raw materials such as low-manganese sinter or during periods of fluctuating furnace conditions, hot blast stove replacement frequently encounters excessive air pressure fluctuations. Existing technologies suffer from systemic defects: the responsible party for constant air pressure operation is vaguely defined, lacking a clear accountability mechanism, resulting in a lack of effective constraints on the operation process; the air pressure adjustment process before, during, and after replacement has not been standardized, and air pressure fluctuations often exceed the allowable range of ±5 kPa, frequently triggering abnormal alarms; the No. 3 hot blast stove gas combustion valve experiences air leakage due to refractory material defects or decreased sealing performance, significantly exacerbating the instability of the blast air volume; abnormal automatic venting of the equalizing valve directly leads to a sudden drop in air pressure, interacting with the unfavorable blast furnace conditions to form a vicious cycle of "non-standard operation → equipment hazard exposure → increased air pressure fluctuations → deterioration of furnace conditions." These problems not only disrupt production continuity but also lead to decreased equipment operating efficiency and energy waste, severely restricting the stability and reliability of the blast furnace smelting process. Therefore, there is an urgent need for a comprehensive air pressure stabilization control solution that can systematically address issues such as unclear operational responsibilities, erratic air pressure regulation, lack of monitoring of potential equipment hazards, insufficient inter-departmental coordination, and delayed emergency response. Summary of the Invention

[0003] The purpose of this invention is to provide a method and system for stabilizing the air pressure during hot blast stove replacement, so as to solve the problems mentioned in the background art. It has the advantages of effectively stabilizing air pressure, improving the safety and efficiency of furnace replacement operation, and reducing equipment failure and energy waste.

[0004] To achieve the above objectives, the basic solution provided by this invention is: a method for stabilizing the blast pressure of a hot blast stove, comprising the following steps: S1: Clearly define the blower room operator as the person responsible for the air pressure control throughout the furnace replacement process and sign a responsibility agreement; set the relevant air pressure benchmark value for coke feeding as the target air pressure before furnace replacement, and set the blower benchmark frequency to 42-45Hz through the central control platform to stabilize the initial air pressure to the target value before furnace replacement, and simultaneously complete the pre-inspection of the gas combustion valve and pressure equalization valve of No. 3 hot blast stove; S2: 10 minutes before the furnace replacement, the blower room operator adjusts the blower frequency through the central control platform to precisely adjust the air pressure to the target value before the furnace replacement, and after maintaining stability for ≥5 minutes, sends the furnace replacement start command to the hot blast stove operator. S3: Start the furnace replacement operation. The hot blast stove operator switches valves according to the standardized procedure. The blower room operator is on duty throughout the process and monitors the air pressure data in real time. The air pressure is kept stable by fine-tuning the blower frequency. If the air pressure fluctuation exceeds ±2kPa, the automatic adjustment program is immediately triggered until the fluctuation returns to the threshold. S4: During the furnace replacement process, the blower room operator and the hot blast stove operator synchronize the air pressure and air volume data every 5 minutes. The equipment maintenance team monitors the sealing status of the No. 3 combustion valve and the triggering logic of the pressure equalization valve in real time. If the combustion valve is found to be leaking air or the pressure equalization valve is found to be abnormal, it is immediately fed back to the central control platform. S5: After the furnace replacement is completed, the wind pressure is continuously monitored for 30 minutes. The central control platform records the wind pressure data every 10 minutes. If the wind pressure deviates from the target value before the furnace replacement by more than ±3 kPa and the duration exceeds 5 minutes, the wind pressure compensation adjustment program is started to gradually return to the target value. S6: The blast furnace workshop monitors furnace condition parameters in real time. If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material hanging, a furnace condition warning will be sent immediately. The blower room operator will extend the air pressure stabilization time to ≥15 minutes, and the hot blast stove operator will slow down the furnace replacement speed. S7: Establish a three-level inspection mechanism: operators conduct daily inspections every hour, equipment maintenance teams conduct special inspections every week, and management departments conduct random checks every week. If any hidden dangers are found, they should be reported immediately through the hidden danger management module, and the responsible person and time limit for handling should be clearly defined. S8: If the pressure equalization valve automatically releases air, the combustion valve leaks air severely, or the air pressure drops suddenly by more than ±5 kPa during the furnace replacement process, immediately initiate the emergency handling for abnormal operating conditions, and simultaneously adjust the fan frequency and valve status. After the operating conditions stabilize, resume normal furnace replacement operations.

[0005] Furthermore, in step S1, the target wind pressure fluctuation benchmark threshold before furnace replacement is set to ≤±1kPa, and the fan frequency adjustment accuracy is ±0.1Hz; the pre-inspection of the gas combustion valve of No. 3 hot blast stove includes the inspection of refractory integrity and the aging degree of the seals, and the pre-inspection of the equalizing valve covers the inspection of the solenoid valve, control circuit and trigger logic.

[0006] Furthermore, in step S7, the key points of the special inspection include the refractory material and sealing condition of the No. 3 combustion valve, the control circuit of the pressure equalization valve and the valve opening and closing response time, and the accuracy of the air pressure and air volume detection instruments; a comprehensive inspection is carried out once a month, and the inspection frequency is increased to once every 2 hours when the furnace condition is not good.

[0007] Furthermore, in step S6, after the furnace condition warning is triggered, the blower frequency adjustment range is controlled within ±0.5Hz / time, and the valve switching time difference is extended from the usual 3 seconds to 5 seconds.

[0008] Furthermore, in step S8, the specific method for emergency handling of abnormal operating conditions is as follows: Automatic air release from the equalizing valve: Immediately increase the fan frequency by 2-3Hz, and the hot air furnace operator simultaneously closes the manual control switch of the equalizing valve. The equipment maintenance team arrives at the site within 15 minutes to check the solenoid valve and control circuit. After troubleshooting, gradually reduce the fan frequency by ±0.3Hz / time. The No. 3 combustion valve is seriously leaking air: Immediately use high-temperature resistant sealant to temporarily seal the leak. The fan room operator should increase the fan frequency by 1-2Hz to maintain air pressure. Arrange for shutdown and maintenance within the next 2-3 weeks, and replace the refractory materials and seals. If the wind pressure drops by more than ±5 kPa: Immediately stop the furnace replacement operation and close the air supply valve. The operator in the blower room should quickly increase the blower frequency to 45-48 Hz. After the wind pressure returns to the target value before the furnace replacement and stabilizes for ≥10 minutes, restart the furnace replacement process.

[0009] Furthermore, the entire furnace replacement operation time is controlled within 60 minutes, the preparation and start-up time of steps S1 to S3 is controlled within 20 minutes, and the furnace replacement and stabilization time of steps S3 to S8 is controlled within 40 minutes.

[0010] Furthermore, in step S5, the fan frequency adjustment range in the wind pressure compensation adjustment program is ±0.2Hz / time.

[0011] A system for implementing the above-described hot blast stove pressure stabilization control method includes: Responsibility Management Module: Stores operator job information, electronic files of responsibility agreements, and assessment standards to enable accountability. Wind pressure regulation module: Connects to the fan control system, receives operation commands to achieve precise adjustment of fan frequency, and the adjustment response time is ≤1 second; Valve monitoring module: Real-time acquisition of the opening and closing status, sealing performance and trigger logic data of No. 3 combustion valve and pressure equalization valve, and has an abnormal alarm function; Collaborative communication module: Enables data synchronization and command transmission between the blower room, hot blast stove operators, and blast furnace workshop, with a latency of ≤100ms; Blast furnace condition early warning module: Real-time monitoring of parameters such as blast furnace temperature and internal pressure, and automatic sending of early warning information when they exceed the set threshold; Hazard management module: Records inspection information, hazard reports, handling process and acceptance results, and generates closed-loop management reports; Emergency Response Module: Stores emergency response procedures for abnormal operating conditions, automatically pushes operation instructions when an emergency is triggered, and synchronously controls the basic status of fans and valves.

[0012] Furthermore, the wind pressure regulation module has a fan frequency regulation accuracy of ±0.1Hz, which can achieve precise adjustment of the fan frequency within the range of 42-48Hz.

[0013] Furthermore, the valve monitoring module can monitor the condition of the refractory material of the No. 3 combustion valve, the aging degree of the seals, the action response time of the pressure equalizing valve solenoid valve, and the connection status of the control circuit in real time.

[0014] Compared with the prior art, the advantages of the present invention are as follows: the present invention solves the problem of wind pressure fluctuation by clarifying the responsible person, setting wind pressure targets, real-time monitoring and standardizing the process, and has the advantages of effectively stabilizing wind pressure, improving the safety and efficiency of furnace changing operation, and reducing equipment failure and energy waste. Detailed Implementation

[0015] The present invention will be further described in detail below through specific embodiments: In traditional hot blast stove replacement operations, there are systemic defects in the control of blast pressure stability. These defects manifest as unclear division of operational responsibilities, lack of standardized procedures for blast pressure adjustment before, during, and after the replacement, insufficient monitoring of key equipment status, and a lack of coordination mechanisms between different positions. Specifically, blast pressure fluctuations easily exceed the normal range of ±5 kPa, leading to frequent abnormal alarms; refractory material detachment from the gas combustion valve of the No. 3 hot blast stove causes air leakage, exacerbating fluctuations in the blast air volume; abnormal automatic venting of the pressure equalization valve causes a sudden drop in blast pressure, which in turn creates a vicious cycle with the unfavorable blast furnace conditions, affecting hot blast heat exchange efficiency, blast continuity, and blast furnace operational stability.

[0016] For example, in the blast furnace production process using low-manganese sintered ore, when the No. 3 hot blast stove underwent a furnace changeover operation, the refractory material of the gas combustion valve partially detached due to long-term high-temperature erosion, leading to sealing failure and air leakage. Simultaneously, an abnormality in the equalizing valve control logic triggered automatic venting, causing a rapid drop in air pressure. Furthermore, the data synchronization between the blower room operator and the hot blast stove operator was not timely, failing to quickly adjust the blower frequency to compensate for the air volume loss. This resulted in air pressure fluctuations exceeding the allowable threshold, causing pressure imbalance within the blast furnace, disrupting the continuity of air supply, and leading to an abnormal furnace operation. Specifically, the equipment maintenance team failed to monitor the sealing status of the No. 3 combustion valve and the triggering logic of the equalizing valve in real time and failed to provide feedback to the central control platform. The operators also failed to intervene promptly based on air pressure data, further exacerbating the problem.

[0017] If the above problems are not addressed, wind pressure fluctuations will occur repeatedly and gradually intensify, further exposing potential equipment hazards during continuous operation. The deteriorating trend of the blast furnace condition will be difficult to curb, potentially leading to interruptions in the air supply system and severe damage to production stability, threatening the safety and continuity of the blast furnace smelting process. In particular, the combined effect of inadequate operating procedures and insufficient equipment condition monitoring will significantly increase the difficulty of wind pressure control, thereby affecting the reliable operation of the entire smelting system.

[0018] In response, this application proposes a method for stabilizing the blast pressure of a hot blast stove, comprising the following steps: S1: Clearly define the blower room operator as the person responsible for the air pressure control throughout the furnace replacement process and sign a responsibility agreement; set the relevant air pressure benchmark value for coke feeding as the target air pressure before furnace replacement, and set the blower benchmark frequency to 42-45Hz through the central control platform to stabilize the initial air pressure to the target value before furnace replacement, and simultaneously complete the pre-inspection of the gas combustion valve and pressure equalization valve of No. 3 hot blast stove; S2: 10 minutes before the furnace replacement, the blower room operator adjusts the blower frequency through the central control platform to precisely adjust the air pressure to the target value before the furnace replacement, and after maintaining stability for ≥5 minutes, sends the furnace replacement start command to the hot blast stove operator. S3: Start the furnace replacement operation. The hot blast stove operator switches valves according to the standardized procedure. The blower room operator is on duty throughout the process and monitors the air pressure data in real time. The air pressure is kept stable by fine-tuning the blower frequency. If the air pressure fluctuation exceeds ±2kPa, the automatic adjustment program is immediately triggered until the fluctuation returns to the threshold. S4: During the furnace replacement process, the blower room operator and the hot blast stove operator synchronize the air pressure and air volume data every 5 minutes. The equipment maintenance team monitors the sealing status of the No. 3 combustion valve and the triggering logic of the pressure equalization valve in real time. If the combustion valve is found to be leaking air or the pressure equalization valve is found to be abnormal, it is immediately fed back to the central control platform. S5: After the furnace replacement is completed, the wind pressure is continuously monitored for 30 minutes. The central control platform records the wind pressure data every 10 minutes. If the wind pressure deviates from the target value before the furnace replacement by more than ±3 kPa and the duration exceeds 5 minutes, the wind pressure compensation adjustment program is started to gradually return to the target value. S6: The blast furnace workshop monitors furnace condition parameters in real time. If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material hanging, a furnace condition warning will be sent immediately. The blower room operator will extend the air pressure stabilization time to ≥15 minutes, and the hot blast stove operator will slow down the furnace replacement speed. S7: Establish a three-level inspection mechanism: operators conduct daily inspections every hour, equipment maintenance teams conduct special inspections every week, and management departments conduct random checks every week. If any hidden dangers are found, they should be reported immediately through the hidden danger management module, and the responsible person and time limit for handling should be clearly defined. S8: If the pressure equalization valve automatically releases air, the combustion valve leaks air severely, or the air pressure drops suddenly by more than ±5 kPa during the furnace replacement process, immediately initiate the emergency handling for abnormal operating conditions, and simultaneously adjust the fan frequency and valve status. After the operating conditions stabilize, resume normal furnace replacement operations.

[0019] For ease of understanding, the following explains some key terms in this embodiment: Hot blast stove switching operation: This refers to the process during blast furnace smelting where, to ensure continuous production, a hot blast stove that is currently supplying air is switched to heating mode, while another hot blast stove that has already been heated is switched to air supply mode. This process involves the opening and closing of multiple valves and precise control of air pressure, which has a significant impact on the stability of blast furnace production.

[0020] Blast pressure: refers to the gas pressure in the hot blast stove's air supply system. Its stability directly affects the heat exchange efficiency of the hot blast and the smooth operation of the blast furnace. During furnace switching, fluctuations in blast pressure need to be strictly controlled within a certain range.

[0021] Central control platform: refers to a control system used for centralized monitoring and operation of industrial production processes. In this method, the central control platform is used for setting and adjusting the fan frequency, monitoring and recording wind pressure data, sending commands, and providing feedback on abnormal information.

[0022] Fan reference frequency: refers to the frequency parameter that controls the operating speed of the fan. By adjusting the fan frequency, the air volume and air pressure of the fan can be changed, thereby achieving precise control of the air pressure.

[0023] Reference value for coke charging air pressure: This refers to the reference air pressure value set according to the process requirements of coke charging in blast furnaces. This value is usually used as the target air pressure to be achieved before furnace replacement to ensure the stability of blast furnace conditions after replacement.

[0024] Gas combustion valve for hot blast stove #3: This refers to the valve that controls the entry of gas into the combustion chamber of hot blast stove #3. Its sealing condition and the accuracy of its opening and closing actions are crucial to the heating efficiency and safety of the hot blast stove.

[0025] Pressure equalizing valve: This refers to a valve used to balance the internal pressure of a hot blast stove. Under certain operating conditions, the pressure equalizing valve will automatically open to release the pressure inside the furnace and prevent equipment damage; however, its abnormal operation may cause a sudden drop in air pressure.

[0026] Blast furnace condition parameters: These are key indicators reflecting the internal operating status of the blast furnace, including furnace temperature and internal pressure. Fluctuations in these parameters may indicate abnormal blast furnace operation, requiring timely adjustments to the operation.

[0027] Hazard Management Module: This refers to an information system used to record, track, and handle potential risks and problems discovered during the production process. Through this module, closed-loop management of hazards such as equipment defects and improper operation can be achieved.

[0028] Emergency handling for abnormal operating conditions: refers to emergency response measures taken in response to sudden and abnormal situations (such as sudden drop in wind pressure, equipment failure, etc.) that occur during the production process, with the aim of quickly restoring production stability and preventing the accident from escalating.

[0029] This embodiment provides a method for stabilizing the heat exchange air pressure of a hot blast stove, the main steps of which are as follows: In step S1, the blower room operator is first identified as the person responsible for air pressure control throughout the entire boiler changeover process, and a responsibility agreement is signed. This aims to establish a clear responsibility system to ensure that air pressure control is handled by a designated person. For example, the blower room team leader can sign a written responsibility agreement with the operator, clearly defining their air pressure control responsibilities during boiler changeover preparation, the boiler changeover process, and the post-changeover stabilization phase. Another approach is to incorporate the blower room operator's responsibilities into their job description through internal management regulations and conduct regular assessments.

[0030] Next, the baseline value for the coke charging air pressure is set as the target air pressure before the furnace changeover. This target air pressure can be set empirically based on historical production data, for example, according to the average air pressure value during stable blast furnace operation. Alternatively, the process engineer can manually input a recommended air pressure value as the target based on the current coke charging scheme for the blast furnace.

[0031] Subsequently, the blower's reference frequency is set to 42-45Hz via the central control platform to stabilize the initial air pressure to the target value before the furnace changeover. The blower frequency can be set manually via the central control platform's input interface; operators adjust the frequency based on experience, observing air pressure changes until the target value is reached. Alternatively, the central control platform provides a preset frequency range, within which operators can make fine adjustments.

[0032] Simultaneously conduct a pre-inspection of the gas combustion valve and pressure equalization valve of the No. 3 hot blast stove. The pre-inspection can be performed by the operator visually checking the valves for any obvious damage or leaks. Alternatively, the operator can manually operate the valves to perform an opening and closing test to confirm that their operation is smooth.

[0033] In step S2, 10 minutes before the furnace changeover, the blower room operator adjusts the blower frequency via the central control platform to precisely adjust the air pressure to the target value before the furnace changeover. This adjustment process can be performed by the operator manually fine-tuning the blower frequency knob based on the air pressure data displayed on the central control platform or through the software interface. For example, the operator can check the air pressure every minute and make small adjustments to the frequency.

[0034] After maintaining stability for ≥5 minutes, a furnace start-up command is sent to the hot blast stove operator. This command can be sent via the central control platform's internal communication system, such as by sending a text message or a preset start signal. Alternatively, it can be given verbally via walkie-talkie.

[0035] In step S3, the furnace switching operation is initiated, and the hot blast stove operator switches valves according to a standardized procedure. This standardized procedure can be a paper operation manual, with the operator switching valves one by one following the steps outlined in the manual. Alternatively, the central control platform can display the valve switching sequence and status, guiding the operator through the process.

[0036] The wind turbine room operator is on duty throughout the entire process, monitoring the wind pressure data in real time. Real-time monitoring can be performed via the wind pressure trend graph on the central control platform, allowing the operator to continuously observe changes in the wind pressure curve. Alternatively, a wind pressure alarm threshold can be set; when the wind pressure exceeds the specified range, the system will automatically issue an audible and visual alarm.

[0037] Stable air pressure is maintained by fine-tuning the fan frequency. Frequency adjustments can be made via the precise adjustment function on the central control platform, for example, in increments of 0.1Hz. Alternatively, operators can use their experience to judge air pressure trends and make small-scale frequency adjustments in advance.

[0038] If wind pressure fluctuations exceed ±2 kPa, an automatic adjustment program is immediately triggered until the fluctuation returns to within the threshold. This automatic adjustment program can be preset in the wind turbine control system. When wind pressure exceeds the set range, the system automatically calculates and adjusts the wind turbine frequency to restore stable wind pressure. For example, the system can dynamically adjust the frequency based on the degree and rate of wind pressure deviation.

[0039] In step S4, during the furnace changeover process, the blower room operator and the hot blast stove operator synchronize the air pressure and air volume data every 5 minutes. Data synchronization can be achieved through the shared interface of the central control platform, allowing both operators to simultaneously view the latest air pressure and air volume data. Alternatively, both operators can verbally report the data via walkie-talkie to confirm data consistency.

[0040] The equipment maintenance team monitors the sealing status of the #3 combustion valve and the triggering logic of the pressure equalizing valve in real time. The sealing status is monitored using sensors installed near the valve, which transmit data to the central control platform. Monitoring the triggering logic of the pressure equalizing valve is accomplished by checking the signal status of its control circuit.

[0041] Upon detecting any abnormal signals from the combustion valve (air leak) or the equalizing valve, the system should immediately report them to the central control platform. This can be done by the operator clicking the "Report Abnormality" button on the platform and entering a brief description. Alternatively, the system can automatically generate an alarm message and send it to the central control platform upon detecting an abnormality.

[0042] In step S5, after the furnace change is completed, the air pressure is continuously monitored for 30 minutes. Monitoring can be performed using the historical data query function on the central control platform, allowing operators to view the air pressure curve within 30 minutes after the furnace change. Alternatively, the system can automatically record and display the air pressure data for this period.

[0043] The central control platform records wind pressure data every 10 minutes. Data recording can be automatically completed by the central control platform's database, storing information such as wind pressure values ​​and timestamps.

[0044] If the air pressure deviates from the target value before furnace replacement by more than ±3 kPa and the deviation lasts for more than 5 minutes, the air pressure compensation adjustment program will be activated to gradually return to the target value. The compensation adjustment program can be preset in the blower control system. When the conditions are met, the system will automatically adjust the blower frequency in small steps until the air pressure returns to the target range. For example, the system can adjust the frequency every 30 seconds, with each adjustment being 0.1 Hz.

[0045] In step S6, the blast furnace workshop monitors furnace condition parameters in real time. These parameters can be monitored via instruments on the blast furnace central control system, allowing operators to observe values ​​such as furnace temperature and internal pressure.

[0046] If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material hanging, a furnace condition warning will be issued immediately. The warning can be automatically generated by the blast furnace central control system and sent to the central control platform of the relevant operating position. Alternatively, the blast furnace operator can manually trigger the warning upon detecting an anomaly.

[0047] The wind turbine room operator should extend the wind pressure stabilization time to ≥15 minutes. This extension can be achieved using a timer on the central control platform. Upon receiving an alert, the operator sets the timer to 15 minutes and continues to maintain stable wind pressure during this period.

[0048] The hot blast stove operator should slow down the furnace switching speed. This can be achieved by extending the valve switching interval. For example, the original 3-second switching interval can be extended to 5 seconds.

[0049] In step S7, a three-level inspection mechanism is established. Operators conduct daily inspections once per hour. Daily inspections can be carried out by operators according to a pre-set inspection route and checkpoints, and a paper inspection record form must be filled out.

[0050] The equipment maintenance team conducts weekly specialized inspections. These inspections can be targeted at specific equipment (such as combustion valves and pressure equalizing valves), using specialized testing tools to check their operational status.

[0051] Management will conduct random inspections weekly. These inspections can be carried out by reviewing inspection records and checking equipment operation on-site.

[0052] Upon discovering a potential hazard, it must be immediately reported through the hazard management module, clearly specifying the responsible person and the time limit for handling it. Hazard reporting can be done through the hazard management module on the central control platform. Operators fill in information such as hazard description, location, and discovery time, and specify the personnel responsible for handling it and the completion deadline.

[0053] In step S8, if the pressure equalization valve automatically releases air, the combustion valve experiences severe air leakage, or the air pressure drops by more than ±5 kPa during the furnace changeover process, the emergency response to the abnormal operating condition will be initiated immediately. The emergency response can be initiated via the "Emergency Start" button on the central control platform, and the system will automatically retrieve the corresponding emergency plan.

[0054] Synchronously adjust the fan frequency and valve status. Fan frequency adjustment can be performed via the emergency adjustment interface on the central control platform, allowing operators to quickly adjust the frequency according to the contingency plan. Valve status adjustment can be performed manually by the hot blast stove operator according to the emergency plan.

[0055] Once the operating conditions stabilize, resume regular furnace replacement procedures. Stable operating conditions can be determined by indicators such as air pressure and furnace condition parameters returning to normal ranges. After resuming regular operations, continue with the furnace replacement process.

[0056] The above technical solution will be explained in more detail below through a more specific embodiment: Suppose that in a blast furnace smelting plant, a replacement operation needs to be performed on hot blast stove No. 3. Before the replacement, the process personnel in the blast furnace workshop determine that the target blast pressure before the replacement is 150 kPa based on the current coke charging plan.

[0057] First, in step S1, blower room operator A was identified as the person responsible for air pressure control throughout the entire furnace replacement process and a corresponding responsibility agreement was signed. Operator A set the blower reference frequency to 43Hz via the central control platform, and after a period of stabilization, the initial air pressure was stabilized at 150kPa. Simultaneously, hot blast stove operator B conducted a pre-inspection of the gas combustion valve and pressure equalization valve of hot blast stove #3, confirming that there were no obvious abnormalities in their appearance.

[0058] Ten minutes before the furnace changeover, proceed to step S2. Operator A uses the fine adjustment function on the central control platform to fine-tune the blower frequency to 43.2Hz, precisely stabilizing the air pressure at 150kPa, which is maintained for 6 minutes. Subsequently, operator A sends the furnace changeover start command to hot blast stove operator B through the internal communication system of the central control platform.

[0059] Upon receiving the instruction, hot blast stove operator B initiated the furnace switching operation in step S3, strictly following the standardized procedure to sequentially switch the hot blast stove's air supply valve, gas valve, and other components. Throughout this process, operator A remained on duty at the central control platform, monitoring the air pressure data in real time. When slight fluctuations in air pressure occurred, operator A would fine-tune the fan frequency by 0.1Hz via the central control platform to maintain stable air pressure. For example, if the air pressure briefly rose to 152.5 kPa, the system immediately triggered an automatic adjustment program, slightly reducing the fan frequency to quickly bring the air pressure back down to within the range of 150 kPa ± 2 kPa.

[0060] During the furnace changeover process, proceed to step S4. Blower room operator A and hot blast stove operator B synchronize air pressure and air volume data every 5 minutes via the central control platform to ensure both have a consistent understanding of the current operating conditions. Simultaneously, engineer C from the equipment maintenance team monitors the sealing status of combustion valve #3 and the triggering logic of the pressure equalization valve in real time using sensor data. During one monitoring session, engineer C noticed a slight decrease in the sealing status of combustion valve #3, but it had not yet reached the point of air leakage. This situation was immediately reported to the central control platform via the hazard management module.

[0061] After the furnace replacement is completed, proceed to step S5. Operator A continuously monitors the air pressure for 30 minutes, and the central control platform automatically records the air pressure data every 10 minutes. During the monitoring process, it was found that the air pressure deviated from the target value by 153.5 kPa 15 minutes after the furnace replacement was completed, and this deviation persisted for 7 minutes. At this point, the air pressure compensation adjustment program was automatically activated, and the system gradually adjusted the blower frequency at an increment of 0.2 Hz / cycle, eventually bringing the air pressure back to the target value of 150 kPa.

[0062] Throughout the furnace changeover process, the blast furnace workshop monitors the furnace condition parameters in real time during step S6. When the blast furnace temperature fluctuates by more than ±10℃, the blast furnace central control system immediately sends a furnace condition warning to the blower room and hot blast stove operating positions. Upon receiving the warning, blower room operator A extends the blast pressure stabilization time to 15 minutes, while hot blast stove operator B slows down the valve switching speed, extending the switching time difference from the usual 3 seconds to 5 seconds to reduce the impact on the furnace condition.

[0063] To continuously optimize management, the plant established a three-tiered inspection mechanism in step S7. Operators A and B conduct daily routine inspections, the equipment maintenance team conducts weekly special inspections of the No. 3 combustion valve and the pressure equalizing valve, and the management department conducts weekly random checks. Through this mechanism, several potential hazards were promptly identified and addressed. For example, during a special inspection, slight wear was found in the pressure equalizing valve control circuit, which was immediately reported through the hazard management module and repairs were arranged.

[0064] During a furnace changeover, the air pressure suddenly dropped to 140 kPa, deviating from the target value by more than 5 kPa. The emergency handling procedure for this abnormal condition was immediately initiated in step S8. Operator A immediately stopped the furnace changeover operation and shut off the air supply valve, while simultaneously increasing the blower frequency to 46 Hz. After the air pressure recovered to 150 kPa and stabilized for 10 minutes, the furnace changeover process was restarted.

[0065] Through the above embodiments, this method forms a closed-loop control system by clarifying responsibilities, standardizing operations, real-time monitoring, collaborative linkage, and emergency response. It effectively solves problems such as excessive air pressure fluctuations, equipment hazards, insufficient coordination, and delayed emergency response during furnace replacement, ensuring the stable and smooth operation of blast furnace production.

[0066] In conjunction with the above embodiments, the hot blast stove pressure stabilization control method proposed in this embodiment demonstrates a significant technical contribution in solving the pressure fluctuation problem existing in the prior art.

[0067] Firstly, regarding the clarification of responsibilities, existing technologies often have vague and unclear responsibilities for constant air pressure operation, making it difficult to trace the source of problems. This embodiment, through step S1, clearly designates the blower room operator as the person responsible for air pressure control throughout the entire boiler changeover process and signs a responsibility agreement, establishing a clear responsibility system from a management perspective. This contrasts sharply with existing technologies that lack clearly defined responsible parties, effectively improving the standardization and execution of operations.

[0068] Secondly, regarding the standardization of wind pressure regulation, existing technologies lack systematic standards for wind pressure regulation before, during, and after furnace replacement, resulting in large fluctuations in wind pressure. This embodiment constructs a complete wind pressure regulation process through steps S1, S2, S3, and S5, which includes setting the target wind pressure before furnace replacement, precisely adjusting the blower frequency, real-time monitoring and fine-tuning during furnace replacement, and continuous monitoring and compensation adjustment after furnace replacement. For example, precise adjustment and stabilization are performed 10 minutes before furnace replacement, and continuous monitoring and initiation of compensation adjustment procedures are performed after furnace replacement. These meticulous steps are significantly superior to the extensive wind pressure control methods in existing technologies.

[0069] Furthermore, regarding equipment hazard monitoring and handling, in existing technologies, air leakage from the gas combustion valve of the No. 3 hot blast stove and abnormal venting from the pressure equalization valve are common causes of sudden drops in air pressure. This embodiment adds a pre-inspection of the combustion valve and pressure equalization valve in step S1, and introduces real-time monitoring of the combustion valve's sealing status and the pressure equalization valve's triggering logic by the equipment maintenance team in step S4. This proactive prevention and real-time monitoring mechanism can promptly detect and report equipment hazards, avoiding severe air pressure fluctuations caused by equipment failures in existing technologies.

[0070] Furthermore, in terms of collaborative operation and emergency response, existing technologies often suffer from lags in data synchronization and emergency handling between various operational positions. This embodiment achieves data synchronization between the blower room and hot blast stove operators through step S4, and introduces a furnace condition early warning mechanism for the blast furnace workshop through step S6, realizing collaborative operation between multiple positions. More importantly, step S8 provides a mechanism for immediately initiating emergency handling for abnormal operating conditions such as automatic venting of the equalizing valve, severe venting of the combustion valve, or sudden drop in air pressure, and simultaneously adjusts the blower frequency and valve status. This rapid response and collaborative handling capability significantly improves the efficiency of dealing with emergencies and effectively avoids the vicious cycle caused by emergency delays in existing technologies.

[0071] In summary, the hot blast stove pressure stabilization control method proposed in this embodiment forms a comprehensive and efficient control system through the organic combination of a series of technical means, including clear responsibilities, standardized processes, equipment monitoring, collaborative linkage, and emergency response. This method effectively solves problems such as non-standard operation, equipment hazards, insufficient coordination, and delayed emergency response in existing technologies, thereby ensuring the pressure stability during the hot blast stove pressure changeover process and improving the overall efficiency and stability of blast furnace smelting production.

[0072] In some of the embodiments described above in this application, a method for stabilizing the blast pressure during hot blast stove replacement is proposed. This method manages the blast pressure during the replacement process through a series of steps. However, in actual operation, if the blast pressure control before replacement is not precise enough, or if there are potential hazards in key equipment before replacement that are not detected in time, it may lead to drastic fluctuations in blast pressure during the replacement process, or even equipment failure, affecting the smooth progress of the replacement and the stable operation of the blast furnace.

[0073] In this regard, this application further proposes that the implementation details of step S1 in the above method include: the target wind pressure fluctuation benchmark threshold is set to ≤±1kPa before furnace replacement, and the fan frequency adjustment accuracy is ±0.1Hz; the pre-inspection of the No. 3 hot blast stove gas combustion valve includes the inspection of refractory integrity and the aging degree of the seals, and the pre-inspection of the equalizing valve covers the inspection of the solenoid valve, control circuit and trigger logic.

[0074] The target wind pressure fluctuation threshold before furnace replacement is set to ≤±1kPa. This ensures that the system allows minimal deviation from the target wind pressure before the furnace replacement operation begins, providing a highly stable starting condition for subsequent operations. This threshold can be configured and modified through the human-machine interface of the central control platform. It can be input by the operator according to actual process requirements or preset in the control system's parameter database and automatically loaded upon system startup. The fan frequency adjustment accuracy is ±0.1Hz, referring to the minimum step size or resolution achievable by the fan control system when adjusting the fan frequency. An adjustment accuracy of ±0.1Hz means the system can perform very fine control of the fan speed, thereby achieving fine-tuning of the wind pressure for more precise stability. This high-precision adjustment can be achieved using a high-resolution frequency converter and precise frequency control algorithms. For example, the frequency converter can support smaller frequency steps, or the control system can employ advanced control strategies such as a PID (proportional-integral-derivative) controller, combined with high-precision sensor feedback, to achieve fine-tuning of the fan frequency. The pre-inspection of the No. 3 hot blast stove gas combustion valve includes checking the integrity of the refractory materials and the aging degree of the seals. This aims to ensure the gas combustion valve is in good working condition before the furnace replacement, preventing gas leakage or abnormal combustion due to valve malfunctions (such as refractory material damage or poor sealing), which could affect the safety and stability of the furnace replacement process. Refractory material integrity can be checked visually, endoscopically, or through non-destructive testing. The aging degree of the seals can be checked by observing the surface of the seals for cracks, hardening, deformation, etc., or by evaluating their sealing performance through a simple airtightness test. The pre-inspection of the pressure equalizing valve covers the solenoid valve, control circuit, and triggering logic. This aims to ensure the pressure equalizing valve can operate normally and reliably before the furnace replacement, especially when automatic venting or pressure regulation is required. Checking the solenoid valve, control circuit, and triggering logic can prevent pressure equalizing valve failure due to electrical faults or control logic errors, thus avoiding uncontrolled air pressure. The solenoid valve can be checked by manually triggering its action response or by measuring its coil resistance, current, and other electrical parameters to determine its working status. Control circuit checks can be performed by using a multimeter to test the continuity and insulation of the circuit, or by verifying the correctness of signal transmission through analog signal input. Trigger logic checks can be performed by simulating different operating conditions and observing whether the pressure equalizing valve opens or closes according to the preset logic.

[0075] The proposed solution sets the target air pressure fluctuation threshold before furnace replacement to ≤±1kPa, achieving a higher standard for air pressure stability. This means that the air pressure must be controlled within an extremely narrow range before furnace replacement, laying a solid foundation for subsequent valve switching and furnace stability. Simultaneously, the blower frequency adjustment accuracy is limited to ±0.1Hz, allowing blower room operators to make extremely fine adjustments to the blower speed via the central control platform to precisely maintain the air pressure within the target threshold. This high-precision adjustment capability, combined with the strict fluctuation threshold, ensures ultimate stability of the initial air pressure. Furthermore, inspections of the refractory integrity and seal aging of the No. 3 hot blast stove gas combustion valve, as well as inspections of the solenoid valve, control circuit, and trigger logic of the equalizing valve, constitute a comprehensive equipment health assessment. These pre-inspections can identify potential equipment malfunctions in advance, such as gas leakage risks in the combustion valve or control failure of the equalizing valve, allowing for timely intervention and repair before the furnace replacement operation begins. Through these refined controls and comprehensive pre-inspections, the method of this application can significantly improve the stability of the air pressure before furnace replacement and the reliability of equipment operation, effectively reduce the risks caused by air pressure fluctuations or equipment failures during furnace replacement, and ensure the smooth progress of the entire furnace replacement process.

[0076] The following is a specific example to illustrate this. When executing step S1, the blower room operator first accesses the parameter configuration interface through the central control platform and sets the target air pressure fluctuation benchmark threshold before furnace replacement to 0.5 kPa. At this time, the system will strictly monitor the air pressure; once the air pressure deviates from the target value by more than 0.5 kPa, it is considered an unstable state. To achieve such precise air pressure control, the blower control system is equipped with a high-resolution frequency converter, whose frequency adjustment step size is set to 0.1 Hz. When the air pressure sensor detects a small air pressure fluctuation, the control system will precisely adjust the blower frequency in increments or decrements of 0.1 Hz according to the PID algorithm until the air pressure returns to the fluctuation range of 0.5 kPa and remains stable. During the pre-inspection of the No. 3 hot blast stove gas combustion valve, the operator will use an industrial endoscope to visually inspect the refractory material inside the combustion valve to confirm the absence of cracks, peeling, or other damage; simultaneously, by observing the elasticity, color, and surface condition of the valve sealing ring, they will determine whether there is any aging or hardening phenomenon and perform a simple valve closure airtightness test. For the pre-inspection of the equalizing valve, the operator will send a test command through the central control system to observe whether the solenoid valve of the equalizing valve can respond quickly and drive the valve to move. At the same time, a multimeter will be used to check whether the voltage and current of the power supply line of the solenoid valve are normal, and a blast furnace pressure abnormal signal will be simulated to verify whether the automatic triggering logic of the equalizing valve correctly executes the venting operation.

[0077] By employing the aforementioned technical solutions, the target wind pressure fluctuation threshold before furnace replacement is set to ≤±1kPa, and a fan frequency adjustment accuracy of ±0.1Hz is used. This ensures that the wind pressure before furnace replacement can be controlled within a very small fluctuation range, significantly improving the stability and precision of wind pressure control. This provides a more reliable and stable starting condition for subsequent furnace replacement operations, effectively avoiding drastic wind pressure fluctuations during the replacement process caused by unstable initial wind pressure. Simultaneously, inspections are conducted on the refractory integrity and sealing aging of the No. 3 hot blast stove's gas combustion valve, as well as on the solenoid valve, control circuit, and trigger logic of the pressure equalization valve. This allows for the early detection and elimination of potential equipment malfunctions, such as gas leaks or pressure equalization valve failure, thereby significantly reducing the risk of safety accidents and equipment failures during furnace replacement. These measures work together to ensure a smooth, safe, and efficient furnace replacement process, reducing the possibility of unplanned downtime and production losses.

[0078] In some other embodiments, this application proposes a method for stabilizing the air pressure during hot blast stove replacement. While a three-tiered inspection mechanism has been established in these embodiments—operators conduct routine inspections hourly, equipment maintenance teams conduct weekly special inspections, and management departments conduct weekly random checks to identify and manage potential equipment hazards—the specific content and frequency of these special inspections are not clearly defined. This may lead to the failure to promptly detect potential faults in key equipment components, especially when furnace conditions are unstable. The inspections lack focus and timeliness, thus affecting the air pressure stability and operational safety during the furnace replacement process.

[0079] In this regard, this application further proposes that in the above method, step S7, the key points of the special inspection include the refractory material and sealing condition of the No. 3 combustion valve, the control circuit of the pressure equalization valve and the valve opening and closing response time, and the accuracy of the air pressure and air volume detection instruments; a comprehensive inspection shall be carried out once a month, and the inspection frequency shall be increased to once every 2 hours when the furnace condition is not good.

[0080] Specialized inspections refer to more in-depth and professional checks conducted on specific equipment or key components than routine inspections. The #3 combustion valve is a critical component of the hot blast stove; its refractory material and sealing condition directly affect combustion efficiency and the operational safety of the hot blast stove. Inspection of the refractory material can include visually inspecting for cracks, peeling, wear, etc., or using non-destructive testing techniques such as infrared thermography to check its internal structural integrity. Inspection of the sealing condition can include checking for gas leaks when the valve is closed, or assessing the integrity of the seals through pressure testing, acoustic testing, etc. The pressure equalizing valve is used to balance the internal pressure of the hot blast stove; the reliability of its control circuit is fundamental to ensuring normal valve operation. Inspection of the control circuit can include checking whether the wiring connections are secure, whether the insulation is intact, whether there is a risk of short circuits or open circuits, and whether the signal output of the control module is normal. Valve opening and closing response time refers to the time required from the issuance of a control command to the completion of the valve's opening or closing action; this is a key indicator for measuring valve performance. Checking its response time can be done by using a timer in conjunction with sensors to monitor valve position changes, or by analyzing the timestamps of command issuance and action completion recorded in the system log. Air pressure and air volume are key parameters for the operation of hot blast stoves, and the accuracy of their measuring instruments directly affects the accuracy of air pressure control. Checking instrument accuracy can include periodically calibrating field instruments using standard measuring instruments, or cross-validating by comparing data from multiple sensors to ensure the accuracy and reliability of measurement results. A comprehensive monthly inspection refers to a systematic and thorough check of the key areas mentioned above during routine inspections. This inspection is typically performed by equipment maintenance teams or specialized technicians, aiming to uncover deeper problems that are difficult to detect during daily inspections. This can be achieved by developing detailed inspection checklists and operating procedures, and recording inspection results and identified problems. Abnormal furnace conditions refer to abnormalities in the blast furnace's operating status, such as large fluctuations in furnace temperature, abnormal furnace pressure, or burden suspension. Under these special operating conditions, the operating load and risks of the hot blast stove increase, thus requiring more frequent inspections. Increasing the inspection frequency from the usual once a month or once a week to once every two hours ensures closer monitoring of equipment status during critical periods, allowing for timely detection and handling of potential problems. This can be achieved by the central control system automatically triggering inspection tasks based on furnace condition warning signals, or by the operator manually increasing the number of inspections based on experience.

[0081] Building upon the aforementioned three-tiered inspection mechanism, this application establishes a more refined and dynamic equipment health management system by clearly defining the specific content and frequency of specialized inspections. Specifically, by focusing specialized inspections on the refractory material and sealing condition of the No. 3 combustion valve, the control circuit and valve opening / closing response time of the pressure equalization valve, and the accuracy of air pressure and volume monitoring instruments, this ensures in-depth and professional inspection of the most critical and fault-prone components during hot blast stove replacement. The normal operation of these components is fundamental to maintaining stable air pressure. For example, poor sealing of the combustion valve can lead to air leakage, directly affecting air pressure control; a faulty or slow-responding control circuit in the pressure equalization valve can cause pressure regulation failure; and insufficient accuracy of the monitoring instruments can distort air pressure data, affecting operator judgment and adjustments. A comprehensive inspection conducted monthly allows for the systematic identification of potential hazards and prevention. Furthermore, when blast furnace conditions deteriorate, the inspection frequency is increased to once every two hours, enabling real-time, high-frequency monitoring of critical equipment status when the system faces greater risks and uncertainties. This dynamically adjusted inspection strategy enables more timely and accurate detection and handling of potential equipment problems, thereby effectively reducing the risk of air pressure fluctuations caused by equipment failures during furnace replacement and ensuring the smooth operation of the furnace replacement process.

[0082] As a specific implementation method, the equipment maintenance team can conduct a comprehensive inspection of the hot blast stove during the first week of each month. During the inspection, an infrared thermal imager is first used to scan the exterior of the No. 3 combustion valve to detect any abnormal hot spots, which may indicate localized damage to the refractory material or leaks in the seals. Simultaneously, a stethoscope or ultrasonic leak detector is used to check the seal when the combustion valve is closed to ensure there are no gas leaks. For the equalizing valve, maintenance personnel can use specialized testing equipment to simulate control signals, measuring the time from signal issuance to the valve fully opening or closing, and comparing it to the standard response time to assess whether the valve's opening and closing response time is within the allowable range. In addition, the control circuit of the equalizing valve will be inspected, including visually checking the physical integrity of the circuit and the tightness of the terminals, and using a multimeter to measure the continuity and insulation resistance of the circuit. For air pressure and flow rate measuring instruments, maintenance personnel will use nationally certified standard pressure gauges and flow meters to calibrate the pressure and flow sensors installed on-site to ensure their measurement accuracy meets requirements. When the blast furnace workshop issues a furnace condition warning, such as a furnace temperature fluctuation greater than ±10℃ or an abnormal furnace pressure, the central control platform will immediately send a notification to the blower room operator and hot blast stove operator, and automatically adjust the frequency of the equipment maintenance team's special inspection tasks to once every 2 hours. At this time, maintenance personnel will focus on the sealing status of the No. 3 combustion valve and the action response of the pressure equalization valve to ensure that the key components of the hot blast stove can operate reliably during special periods of unstable furnace conditions, providing a stable air pressure environment for furnace changeover operations.

[0083] Through the above technical solutions, this application significantly improves the precision and timeliness of equipment status monitoring during hot blast stove replacement. It clarifies the key points of specialized inspections, making checks on the refractory and sealing condition of the No. 3 combustion valve, the control circuit and valve opening / closing response time of the pressure equalization valve, and the accuracy of air pressure and air volume measuring instruments more targeted and professional. This allows for earlier and more accurate detection of potential equipment problems. Monthly comprehensive inspections ensure the reliability of the overall equipment performance. Especially under special circumstances of unfavorable furnace conditions, the inspection frequency is increased to once every two hours, greatly enhancing the real-time control of the status of critical equipment. This effectively avoids drastic fluctuations in air pressure caused by sudden equipment failures, thus ensuring the smooth progress of the furnace replacement operation, reducing production risks, and providing a solid guarantee for the stable operation of the blast furnace.

[0084] In some of the embodiments described above in this application, it is proposed to address furnace condition warnings by extending the air pressure stabilization time and slowing down the furnace switching speed when furnace condition parameters are abnormal. However, in actual operation, when a furnace condition warning is triggered, how to finely adjust the blower frequency and valve switching sequence to ensure a smooth transition of air pressure and further stabilization of the furnace condition, and avoid new fluctuations caused by improper adjustment, remains a problem that requires careful consideration.

[0085] In this regard, this application further proposes that in step S6 above, after the furnace condition warning is triggered, the fan frequency adjustment range is controlled within ±0.5Hz / time, and the valve switching time difference is extended from the usual 3 seconds to 5 seconds.

[0086] Among them, "furnace condition early warning trigger" refers to the alarm signal issued by the system when the furnace condition parameters monitored in real time in the blast furnace workshop, such as furnace temperature fluctuations greater than ±10℃, abnormal furnace pressure, or the existence of potential charge suspension hazards, are detected. This early warning is an important basis for the system to judge that the furnace condition may be unstable or dangerous. "Blower frequency adjustment amplitude controlled within ±0.5Hz / time" means that when adjusting the blower frequency, the step size of each adjustment is limited to within 0.5Hz. This can be achieved through the software logic in the control system, for example, by setting the maximum frequency change rate of the blower frequency converter, or by adding a step size limit to the control algorithm. Another implementation method is that after receiving the early warning, the operator manually or through semi-automatic mode adjusts the frequency in small steps and quickly, ensuring that the impact of each adjustment on the air pressure is gradual. "Valve switching time difference extended from the usual 3 seconds to 5 seconds" means that during the furnace change process, when valve switching operations are required, such as closing one valve and opening another, the time interval between the two actions is increased from the usual 3 seconds to 5 seconds. This can be achieved by modifying the timing parameters in the programmable logic controller (PLC), or by requiring operators to strictly follow the extended time difference when switching valves through operating procedures.

[0087] This application's solution, by strictly limiting the adjustment range of the blower frequency after a furnace condition warning is triggered and extending the valve switching time difference, allows for more precise and gentle control of air pressure and airflow when furnace conditions are unstable. When the blast furnace workshop issues a furnace condition warning, the system no longer allows large jumps in blower frequency, but adjusts it in small steps not exceeding ±0.5Hz / time. This effectively avoids secondary shocks to the furnace condition caused by sudden changes in air volume or pressure. Simultaneously, extending the valve switching time difference to 5 seconds provides more time for system response and stabilization after each valve action, allowing for a smoother transition of furnace pressure and airflow. This achieves more precise and safer furnace changeover operations while "slowing down the furnace changeover speed." This synergistic effect ensures air pressure stability and operational safety under abnormal furnace conditions, effectively reducing the risk of furnace condition deterioration.

[0088] The following is a concrete example to illustrate this. Suppose the blast furnace workshop detects a furnace temperature fluctuation exceeding ±10℃, immediately triggering a furnace condition warning. At this time, the blower operator needs to adjust the blower frequency according to instructions to stabilize the air pressure. If the blower frequency needs to be increased by 1Hz, the control system will not increase the frequency by 1Hz all at once, but in two stages, increasing it by 0.5Hz each time. For example, first increasing it from 45.0Hz to 45.5Hz, and then increasing it to 46.0Hz after the system response stabilizes. Simultaneously, when the hot blast stove operator switches valves, such as switching from the air supply valve to the combustion valve, there will be a 5-second interval between the actions of the two valves, instead of the usual 3 seconds. For example, after the air supply valve is closed, there will be a 5-second wait before the combustion valve is opened.

[0089] The above technical solution effectively prevents further deterioration of the furnace condition caused by excessively rapid adjustment of the blower frequency or too abrupt valve switching when the furnace condition warning is triggered. This refined control method makes the air pressure adjustment process smoother, reduces disturbance to the internal operating conditions of the blast furnace, and thus significantly improves the safety and stability of the furnace changeover process, providing a strong guarantee for the stable operation of the blast furnace.

[0090] In some other embodiments, this application proposes a method for stabilizing the air pressure during hot blast stove replacement. This involves clearly designating the blower room operator as the person responsible for air pressure control throughout the replacement process and signing a responsibility agreement; setting the relevant air pressure benchmark value for coke feeding as the target air pressure before replacement; stabilizing the initial air pressure to the target value before replacement by setting the blower reference frequency to 42-45Hz through the central control platform; simultaneously completing the pre-check of the gas combustion valve and pressure equalization valve of the No. 3 hot blast stove; 10 minutes before replacement, the blower room operator adjusts the blower frequency through the central control platform to precisely adjust the air pressure to the target value before replacement, maintaining stability for ≥5 minutes, and then sending a replacement start command to the hot blast stove operator; initiating the replacement operation, the hot blast stove operator switches valves according to a standardized procedure; the blower room operator is on duty throughout the process and monitors the air pressure data in real time, maintaining air pressure stability by fine-tuning the blower frequency; if the air pressure fluctuation exceeds ±2kPa, an automatic adjustment program is immediately triggered until the fluctuation returns to the threshold; during the replacement process, the blower room... Operators and hot blast stove operators synchronize air pressure and air volume data every 5 minutes. The equipment maintenance team monitors the sealing status of the No. 3 combustion valve and the triggering logic of the pressure equalization valve in real time. If air leakage from the combustion valve or abnormal signals from the pressure equalization valve are detected, they are immediately fed back to the central control platform. After the furnace replacement is completed, the air pressure is continuously monitored for 30 minutes. The central control platform records the air pressure data every 10 minutes. If the air pressure deviates from the target value before the furnace replacement by more than ±3 kPa and the duration exceeds 5 minutes, the air pressure compensation adjustment program is initiated to gradually return to the target value. The blast furnace workshop monitors furnace condition parameters in real time. If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material suspension, a furnace condition warning is immediately sent. The blower room operator extends the air pressure stabilization time to ≥15 minutes, and the hot blast stove operator slows down the furnace replacement speed. A three-level inspection mechanism is established: operators conduct daily inspections every hour, the equipment maintenance team conducts special inspections every week, and the management department conducts random checks every week. If any hidden dangers are found, they are immediately reported through the hidden danger management module, and the responsible person and time limit for handling are clearly defined. However, in actual operation, sudden abnormal conditions may still be encountered, such as automatic air release of the equalizing valve, serious air leakage of the combustion valve, or sudden drop in air pressure. If these abnormal conditions are not dealt with in a timely and effective manner, they will seriously threaten the stability and safety of the furnace changeover process, and may even lead to equipment damage or production interruption.

[0091] In response, this application further proposes that if the pressure equalization valve automatically releases air, the combustion valve experiences severe air leakage, or the air pressure drops by more than ±5 kPa during the furnace replacement process, an emergency response to the abnormal operating conditions should be initiated immediately, and the fan frequency and valve status should be adjusted simultaneously. Once the operating conditions stabilize, the normal furnace replacement operation should be resumed. The specific methods for handling abnormal operating conditions are as follows: When the equalizing valve automatically releases air, immediately increase the fan frequency by 2-3Hz. The hot blast stove operator should simultaneously close the manual control switch of the equalizing valve. The equipment maintenance team should arrive at the site within 15 minutes to check the solenoid valve and control circuit. After troubleshooting, gradually reduce the fan frequency by ±0.3Hz / time. When the No. 3 combustion valve is seriously leaking air, immediately use high-temperature resistant sealant to temporarily seal the leak. The blower room operator should increase the fan frequency by 1-2Hz to maintain the air pressure. Arrange for shutdown maintenance and replacement of refractory materials and seals within the next 2-3 weeks. When the air pressure drops by more than ±5kPa, immediately stop the furnace replacement operation and close the air supply valve. The blower room operator should quickly increase the fan frequency to 45-48Hz. After the air pressure recovers to the target value before the furnace replacement and stabilizes for ≥10 minutes, restart the furnace replacement process.

[0092] The specific methods for handling abnormal operating conditions refer to a series of rapid response and corrective measures that are pre-planned and implemented to address potential abnormal operating conditions during hot blast stove replacement. The aim is to quickly control the situation, prevent escalation, and restore normal or safe conditions as soon as possible when an anomaly occurs. This can include pre-set automated programs, manual intervention procedures for operators, and cross-departmental coordination mechanisms. Automatic venting of the equalizing valve refers to the valve opening on its own without instruction, causing a sudden drop in furnace pressure. This automatic venting may be caused by valve malfunction, control system error, or external interference. Immediately increasing the fan frequency by 2-3 Hz is a direct way to increase air volume and pressure. By rapidly increasing the fan frequency, air volume can be quickly replenished to counteract the pressure drop, thereby maintaining relative stability of the furnace pressure. This operation can be automatically executed by the fan control system according to preset logic or manually adjusted by the fan room operator. The hot blast stove operator simultaneously closes the manual control switch of the equalizing valve to forcibly cut off the automatic venting command or circuit, thereby preventing or slowing down venting and buying time for subsequent troubleshooting and handling. The equipment maintenance team arrives on-site within 15 minutes to inspect the solenoid valve and control circuit. This is to promptly diagnose the cause of the fault, such as checking for solenoid valve jamming, short circuits, or open circuits in the circuit, so as to carry out targeted repairs. After troubleshooting, the fan frequency is gradually adjusted back in increments of ±0.3Hz / cycle. This is to gradually bring the fan frequency back to the baseline value required for normal operation after the pressure equalization valve fault is resolved and restored to normal, avoiding large-scale adjustments that could cause air pressure fluctuations again. Severe air leakage from the #3 combustion valve indicates valve seal failure, leading to gas leakage. This not only wastes energy but may also cause safety accidents and affect combustion efficiency and air pressure stability in the furnace. Air leakage may be caused by wear on the valve sealing surface, aging of the seals, or deformation of the valve body. Immediately using high-temperature resistant sealant to temporarily seal the leak is a quick emergency measure to stop the leak. It can withstand high-temperature environments and effectively stop gas leakage in a short time, buying time for subsequent thorough maintenance and reducing safety risks. The blower room operator increases the blower frequency by 1-2 Hz to maintain air pressure, compensating for pressure loss caused by air leakage and thus maintaining stable air pressure inside the furnace to a certain extent, ensuring the continuity of the furnace changeover process. A shutdown for maintenance and replacement of refractory materials and seals will be scheduled within the next 2-3 weeks to allow for a thorough overhaul of the No. 3 combustion valve at an appropriate time, including replacing worn refractory materials and aging seals, to eliminate safety hazards and restore the valve's normal function. A sudden drop in air pressure > ±5 kPa refers to a significant decrease in furnace air pressure within a short period, exceeding the normal fluctuation range, posing a serious threat to the stable operation of the hot blast stove. Immediately stopping the furnace changeover operation and closing the air supply valve is to cut off the air source, prevent further pressure drop, and create safe conditions for subsequent troubleshooting and handling.The blower room operator quickly increases the blower frequency to 45-48Hz to restore furnace pressure as quickly as possible after a sudden drop in air pressure and the blast valve closing, maximizing air supply capacity and rapidly raising the furnace air pressure to the target value. After the air pressure returns to the pre-replacement target value and stabilizes for ≥10 minutes, the furnace replacement process is restarted. This ensures that the furnace operating conditions have returned to normal after the air pressure has recovered and stabilized for a period, allowing for a safe restart of the furnace replacement process and guaranteeing a smooth overall process.

[0093] This application's solution establishes an emergency response mechanism for abnormal operating conditions during hot blast stove replacement, ensuring rapid response and effective control in case of emergencies. When the system detects automatic venting from the equalizing valve, it immediately compensates for pressure loss by increasing the fan frequency, while the hot blast stove operator manually intervenes to close the equalizing valve to stop the venting. Subsequently, the equipment maintenance team quickly intervenes to troubleshoot the problem at its root, and after troubleshooting, uses a refined frequency adjustment method to avoid secondary air pressure fluctuations. In the case of severe venting from the No. 3 combustion valve, the solution adopts immediate temporary sealing measures, and simultaneously maintains air pressure by fine-tuning the fan frequency, buying time for subsequent planned maintenance, thereby effectively controlling safety risks without interrupting production. When faced with a more severe sudden drop in air pressure, the solution prioritizes safety, immediately stopping the furnace replacement operation and closing the air supply valve, rapidly restoring the furnace pressure by quickly increasing the fan frequency, and only restarting the furnace replacement process after confirming that the air pressure has stabilized. These emergency measures, in conjunction with conventional furnace replacement air pressure stabilization control methods, form a comprehensive risk management system. Conventional control methods maintain stable air pressure under normal operating conditions, while this solution provides a rapid and targeted response under abnormal conditions, avoiding the disruptive impact of abnormal situations on the entire furnace changeover process and ensuring production continuity and safety. Through this tiered and coordinated handling strategy, this solution can significantly improve the overall reliability and safety of the hot blast stove changeover process.

[0094] The following is a concrete example. Suppose that during the hot blast stove replacement process, the central control platform suddenly issues an alarm for automatic venting of the equalizing valve. At this time, the system will immediately trigger the emergency response procedure. The blower room operator will observe that the blower frequency is automatically or manually increased by 2-3Hz, for example, from 43Hz to 45Hz, to quickly increase the air supply and counteract the pressure drop inside the furnace. Simultaneously, the hot blast stove operator will quickly go to the equalizing valve control cabinet and manually operate the manual control switch to close the equalizing valve to ensure that the valve stops venting. Upon receiving the alarm, the equipment maintenance team will respond immediately and arrive on-site within 15 minutes with testing tools to conduct a detailed inspection of the equalizing valve's solenoid valve and control circuitry, such as checking whether the solenoid valve coil is burnt out or the control signal line is broken. Once the fault is resolved, for example, by replacing the damaged solenoid valve, the blower room operator will gradually restore the blower frequency to the target value before the furnace replacement by decreasing the frequency by ±0.3Hz per cycle, for example, every 30 seconds. For example, if the central control platform detects a serious air leak in the No. 3 combustion valve—for instance, an abnormal increase in localized temperature of the valve body detected by an infrared thermal imager, or a gas leak detected by a gas sensor—the on-site operator will immediately use high-temperature resistant sealant, such as silicate-based or ceramic-based sealant, to temporarily seal the leak. Simultaneously, the blower room operator will, based on instructions from the central control platform or experience, increase the blower frequency by 1-2 Hz, for example, from 43 Hz to 44 Hz, to compensate for the pressure loss caused by the air leak and maintain relative stability of the furnace air pressure. Subsequently, the production management department will, based on the severity of the air leak and the effectiveness of the temporary sealing, arrange a thorough overhaul of the No. 3 combustion valve during a planned shutdown maintenance window of 2-3 weeks, including replacing the refractory bricks and graphite sealing rings inside the valve. As another example, if the air pressure monitoring data shows a sudden drop in furnace air pressure exceeding 5 kPa within a short period, for example, from 10 kPa to 4 kPa, the system will immediately issue the highest-level emergency command. The hot blast stove operator will immediately stop the ongoing furnace replacement operation and quickly shut off the air supply valve to cut off the air source. The blower room operator will immediately and rapidly increase the blower frequency to 45-48Hz, for example, directly to 47Hz, to quickly restore the furnace air pressure with maximum air supply capacity. Only after the air pressure has recovered to the target value before the furnace replacement (e.g., 10kPa) and remained stable for more than 10 minutes, and the furnace operating conditions are confirmed to be safe, will the hot blast stove operator restart the furnace replacement process and begin the replacement steps from the beginning.

[0095] Through the above technical solutions, this application can effectively address abnormal operating conditions that may occur during hot blast stove replacement, such as automatic venting of the equalizing valve, severe air leakage from the No. 3 combustion valve, and sudden drops in air pressure. For automatic venting of the equalizing valve, a combination of rapidly increasing the fan frequency and manually closing the valve can quickly suppress the pressure drop and promptly troubleshoot the problem, avoiding production interruptions due to pressure instability. For severe air leakage from the No. 3 combustion valve, a combination of temporary sealing and fine-tuning of the fan frequency can control the leakage and maintain air pressure without immediately shutting down the furnace, buying valuable time for subsequent thorough maintenance and reducing safety risks and economic losses. Facing the more critical sudden drop in air pressure, the solution immediately stops the furnace replacement, closes the air supply valve, and rapidly increases the fan frequency, quickly restoring the furnace pressure, ensuring the safety of operators and equipment, and allowing for an orderly restart of the furnace replacement after the operating conditions stabilize, avoiding secondary accidents that may result from blind operation. These specific emergency response methods, combined with the overall furnace change air pressure stabilization control method, significantly improve the safety, stability, and reliability of the hot blast stove changeover process, and effectively reduce the impact of abnormal operating conditions on production efficiency and equipment lifespan.

[0096] In other embodiments, this application proposes a method for stabilizing the air pressure during hot blast stove replacement. This method involves designating the blower room operator as the person responsible for air pressure control throughout the replacement process and signing a responsibility agreement. The relevant air pressure benchmark value for coke feeding is set as the target air pressure before replacement. The blower reference frequency is set to 42-45Hz via a central control platform to stabilize the initial air pressure to the target value before replacement. Simultaneously, pre-checks are performed on the gas combustion valve and pressure equalization valve of the No. 3 hot blast stove. Ten minutes before replacement, the blower room operator adjusts the blower frequency via the central control platform to precisely adjust the air pressure to the target value before replacement. After maintaining stability for ≥5 minutes, a replacement start command is sent to the hot blast stove operator. The replacement operation is then initiated. The hot blast stove operator switches valves according to a standardized procedure. The blower room operator is on duty throughout the process and monitors the air pressure data in real time. Air pressure stability is maintained by fine-tuning the blower frequency. If the air pressure fluctuation exceeds ±2kPa, an automatic adjustment program is immediately triggered until the fluctuation returns to within the threshold. During the furnace changeover process, the blower room operators and hot blast stove operators synchronize air pressure and air volume data every 5 minutes. The equipment maintenance team monitors the sealing status of the No. 3 combustion valve and the triggering logic of the pressure equalization valve in real time. If any air leakage from the combustion valve or abnormal signal from the pressure equalization valve is detected, it is immediately fed back to the central control platform. After the furnace changeover is completed, the air pressure is continuously monitored for 30 minutes. The central control platform records the air pressure data every 10 minutes. If the air pressure deviates from the target value before the furnace changeover by more than ±3 kPa and the duration exceeds 5 minutes, the air pressure compensation adjustment program is initiated to gradually restore it to the target value. The blast furnace workshop monitors furnace condition parameters in real time. If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material hanging, a furnace condition warning is immediately sent. The blower room operators extend the air pressure stabilization time to ≥15 minutes, and the hot blast stove operators slow down the furnace changeover speed. At the same time, a three-level inspection mechanism is established: operators conduct daily inspections every hour, the equipment maintenance team conducts special inspections every week, and the management department conducts random checks every week. If any hidden dangers are found, they are immediately reported through the hidden danger management module, and the responsible person and time limit for handling are clearly defined. If, during the furnace replacement process, the equalizing valve automatically releases air, the combustion valve experiences severe air leakage, or the air pressure drops by more than ±5 kPa, immediately initiate the emergency handling procedure for abnormal operating conditions, and simultaneously adjust the fan frequency and valve status. Once the operating conditions stabilize, resume normal furnace replacement operations.

[0097] In some embodiments described above in this application, a method for stabilizing the blast pressure during hot blast stove replacement is proposed. This method aims to ensure stable blast pressure during the replacement process by clarifying responsibilities, setting target blast pressure, real-time monitoring and adjustment, data synchronization, and anomaly handling. However, in its implementation, a lack of time management and constraints on the entire operation process and each key stage may lead to excessively long replacement times, low efficiency, and even affect the stability of the furnace condition and production rhythm due to the uncertainty of the operation time.

[0098] In this regard, this application further proposes that the entire furnace replacement operation time be controlled within 60 minutes, the preparation and start-up time of steps S1 to S3 be controlled within 20 minutes, and the furnace replacement and stabilization time of steps S3 to S8 be controlled within 40 minutes.

[0099] The phrase "the entire furnace changeover operation time is controlled within 60 minutes" means that the total time for the hot blast stove furnace changeover operation, from start to finish, is limited to an upper limit. This feature aims to ensure the overall efficiency of the furnace changeover process and avoid affecting production continuity due to operational delays. Implementation methods may include: setting a total timer in the central control system, starting the timer from step S1 of the furnace changeover operation and stopping it after step S8 is completed; triggering an alarm if the total time exceeds 60 minutes; or, making this time limit a rigid indicator in the operating procedures, achieved through strict adherence and supervision by operators. The phrase "the preparation and start-up time for steps S1 to S3 is controlled within 20 minutes" means that the time for the initial preparation and start-up phase of the furnace changeover operation is limited to an upper limit. This phase mainly involves key steps such as clear responsibilities, initial air pressure stabilization, and equipment pre-inspection, and its efficiency directly affects the smooth progress of the subsequent furnace changeover. Implementation methods may include: setting an independent timer for steps S1 to S3 in the central control system, starting from S1 and stopping when S3 is completed, issuing a prompt or alarm if it exceeds 20 minutes; or optimizing the operation process of each sub-step from S1 to S3, such as executing some inspection tasks in parallel, to shorten the overall time of this stage. "The furnace replacement and stabilization time for steps S3 to S8 is controlled within 40 minutes" means that the actual furnace replacement operation and subsequent stabilization stage are limited to an upper limit. This stage covers core operations such as valve switching, real-time air pressure monitoring, data synchronization, furnace condition early warning response, and abnormal operating condition handling, and is a critical period to ensure successful furnace replacement and stable air pressure. Implementation methods may include: setting an independent timer for steps S3 to S8 in the central control system, starting from S3 and stopping when S8 is completed, issuing a prompt or alarm if it exceeds 40 minutes; or providing professional training to operators to improve their proficiency in valve switching and air pressure regulation, and optimizing the connection between each step, thereby efficiently completing the operation within the specified time.

[0100] This application's solution elevates the original method, which only focused on the correctness of operational steps, to a method that balances operational efficiency and time accuracy by clearly controlling the overall duration and key stages of the hot blast stove replacement operation. Building upon the aforementioned hot blast stove replacement air pressure stabilization control method, it introduces constraints such as "the entire replacement operation time should be controlled within 60 minutes," "the preparation and start-up time for steps S1 to S3 should be controlled within 20 minutes," and "the replacement and stabilization time for steps S3 to S8 should be controlled within 40 minutes." This transforms the entire replacement process from an unconstrained workflow into a lean management process with clearly defined time objectives. Specifically, the 20-minute preparation and start-up time limit encourages operators to efficiently complete tasks such as clearly defined responsibilities, initial air pressure stabilization, and equipment pre-checks in the initial stages of the replacement (S1 to S3), laying a rapid and stable foundation for subsequent replacement operations. Following this, a 40-minute time limit for furnace changeover and stabilization ensures that core furnace changeover operations (S3 to S8), including valve switching, real-time air pressure monitoring, data synchronization, and anomaly handling, can be completed within a tight and controlled timeframe, effectively preventing delays during the operation. Finally, a 60-minute overall operation time control, serving as the overall efficiency target, integrates the time management of each stage, forming a tightly linked, time-optimized operational system. This precise time management ensures that the air pressure stabilization control method not only guarantees operational standardization but also significantly improves operational efficiency and predictability, effectively solving the problems of excessively long furnace changeover times, low efficiency, and compromised furnace stability caused by a lack of time constraints.

[0101] The following is a concrete example. At the start of the hot blast stove replacement operation, i.e., when step S1 begins, the central control platform can simultaneously start a master timer with a target time of 60 minutes. Simultaneously, for the preparation and startup phases S1 to S3, the platform can start a sub-timer with a target time of 20 minutes. When step S3 is completed and the replacement operation officially begins, the sub-timers for S1 to S3 stop, and another sub-timer for the replacement and stabilization phases S3 to S8 immediately starts, with a target time of 40 minutes. The central control platform can display the remaining time of these timers in real time and intuitively show the progress of the current phase to the blower room operators and hot blast stove operators through a graphical interface (e.g., progress bars or countdown displays). For example, when the sub-timer for S1 to S3 has 5 minutes remaining, the system can automatically issue a voice prompt, "The preparation and startup phase is about to time out; please speed up the operation," to remind the operators. Similarly, in phases S3 to S8, if the timer shows insufficient remaining time, the system can prompt the operators to check for unnecessary delays and encourage them to efficiently complete the subsequent steps according to standardized procedures. If any timer exceeds its preset time, the system can automatically record the timeout event and generate a corresponding operation log for subsequent analysis and improvement. In this way, operators are always under clear time constraints and guidance when performing tasks S1 to S8, ensuring the rhythm and efficiency of the entire furnace changeover process.

[0102] The aforementioned technical solution allows for clear control over the overall duration of hot blast stove replacement operations and the duration of each key stage, significantly improving the efficiency and predictability of the replacement process. This refined time management effectively avoids disorderly delays in replacement operations, ensuring a compact and efficient process from preparation and startup to actual replacement and stabilization. When implementing the blast pressure stabilization control method, operators can more methodically advance tasks according to the timeline, thereby reducing the risk of prolonged unstable furnace conditions and ensuring production continuity and stability. Simultaneously, clear time objectives provide operators with clear performance guidance, helping to cultivate efficient and standardized operating habits.

[0103] In some other embodiments, this application proposes a method for stabilizing blast pressure during hot blast stove replacement. This method involves continuously monitoring the blast pressure for 30 minutes after the replacement, with the central control platform recording blast pressure data every 10 minutes. If the blast pressure deviates from the pre-replacement target value by more than ±3 kPa for more than 5 minutes, a blast pressure compensation adjustment program is initiated to gradually return to the target value. However, in actual operation, if the blast pressure compensation adjustment program lacks a clearly defined adjustment range, the adjustment process may be too coarse, causing blast pressure overshoot or oscillation, thereby prolonging the blast pressure stabilization time and affecting the stability of blast furnace production.

[0104] In response, this application further proposes that the fan frequency adjustment range in the aforementioned wind pressure compensation adjustment procedure be ±0.2Hz / time. This adjustment range refers to the magnitude of frequency change each time the fan frequency is adjusted. Its function is to refine the wind pressure adjustment process, avoiding wind pressure overshoot or oscillation due to excessive adjustment, while ensuring that the wind pressure is restored to the target value within a reasonable time. This adjustment range can be preset through the control algorithm within the central control platform. For example, when the wind pressure deviates from the target value, the control system sends a command to the fan inverter according to the preset range of ±0.2Hz / time, gradually adjusting the fan frequency by this range. In addition, the adjustment range can also be configured by the operator on the human-machine interface, allowing for fine-tuning based on actual operating conditions or experience, but the default or recommended value is set to ±0.2Hz / time to ensure the stability and efficiency of the adjustment.

[0105] The proposed solution initiates a blower pressure compensation adjustment program after furnace replacement. When the system detects a deviation in blower pressure exceeding ±3 kPa for more than 5 minutes from the pre-replacement target value, the program explicitly specifies that the blower frequency adjustment increment is ±0.2 Hz per cycle. This means that when blower pressure compensation is required, the control system does not adjust the blower frequency drastically all at once, but rather in precise ±0.2 Hz increments. This small-amplitude, gradual adjustment effectively avoids blower pressure overshoot or system oscillation caused by excessive adjustment, ensuring that the blower pressure smoothly and gradually returns to the target value. Through this refined frequency adjustment, the system can more stably handle potential blower pressure fluctuations after furnace replacement, improving the accuracy and stability of blower pressure control and reducing interference with the blast furnace production process.

[0106] The following example illustrates this: After the furnace replacement operation is completed, the central control platform continuously monitors the air pressure data. Suppose that during monitoring, the system detects that the air pressure continuously deviates from the pre-replacement target value; for example, the air pressure remains above the target value by 3.5 kPa for more than 5 minutes. At this point, the air pressure compensation adjustment program is triggered. This program adjusts according to a preset adjustment range, for example, by reducing the blower frequency in steps of 0.2 Hz each time. The control system sends a command to the blower frequency converter to reduce the blower frequency from the current value by 0.2 Hz. Subsequently, the system reassesses the air pressure status. If the air pressure still has not returned to the target range, it will reduce it again by 0.2 Hz, and so on, until the air pressure gradually returns to the range of ±3 kPa of the pre-replacement target value. Conversely, if the air pressure remains below the target value, it will adjust by increasing the blower frequency in steps of 0.2 Hz each time.

[0107] Through the above technical solution, after the hot blast stove replacement is completed, when the blast pressure deviates and requires compensation adjustment, the adjustment range of the blower frequency can be limited to ±0.2Hz / cycle, enabling precise and gradual control of the blast pressure. This small-step adjustment method effectively avoids blast pressure overshoot or system oscillation caused by excessive adjustment, thus significantly improving the stability and accuracy of blast pressure compensation adjustment. This allows the blast pressure to return to the target value before the stove replacement more smoothly and quickly, reducing the adverse effects of blast pressure fluctuations on the stability of blast furnace production and ensuring smooth blast furnace operation.

[0108] In some embodiments described above in this application, a method for stabilizing blast pressure during hot blast stove replacement is proposed. This method aims to stabilize the blast pressure during the replacement process through steps such as clarifying responsibilities, setting target blast pressure, real-time monitoring and adjustment, data synchronization, anomaly handling, and inspection. However, in actual operation, the effective implementation of this method highly depends on the operator's experience, real-time judgment, and close collaboration among multiple departments. This may lead to limitations in control accuracy and response speed, especially under complex or emergency conditions, where manual operation may struggle to ensure continuous blast pressure stability, thereby affecting the smooth operation of blast furnace production.

[0109] In some other embodiments, this application proposes a system for implementing the above-mentioned hot blast stove changeover air pressure stabilization control method. The system includes a responsibility management module, an air pressure regulation module, a valve monitoring module, a collaborative communication module, a furnace condition early warning module, a hidden danger management module, and an emergency handling module.

[0110] The responsibility control module stores operators' job information, electronic responsibility agreements, and performance evaluation standards, aiming to achieve effective accountability. This module can be an integrated database system used to record and manage the assignment of responsibilities, training records, and performance evaluations of all personnel involved in furnace changeover operations, ensuring that each step has a clearly defined responsible party. Furthermore, it can use electronic signatures or identity verification mechanisms to ensure the signing and archiving of responsibility agreements, providing a basis for subsequent accountability.

[0111] The wind pressure regulation module connects to the fan control system, receiving operating commands to precisely adjust the fan frequency, with a response time of less than or equal to 1 second. The core of this module lies in its precise control over the fan frequency, enabling it to quickly adjust the fan speed based on real-time wind pressure data and preset control strategies, thereby stabilizing wind pressure. This can be achieved using a controller based on a PID (Proportional-Integral-Derivative) algorithm, or by employing advanced control algorithms such as fuzzy control and adaptive control to cope with wind pressure fluctuations under different operating conditions.

[0112] The valve monitoring module collects real-time data on the opening and closing status, sealing performance, and triggering logic of the No. 3 combustion valve and the equalizing valve, and also features an anomaly alarm function. This module integrates various sensors, such as limit switches, pressure sensors, and temperature sensors, to continuously monitor key valve operating parameters. For example, by monitoring the valve stroke, it can determine whether the opening and closing is complete; by monitoring the pressure difference or temperature change before and after the valve, its sealing performance can be evaluated; and by analyzing the correspondence between control signals and actual valve actions, the correctness of its triggering logic can be verified. When an anomaly is detected, the module can immediately issue an audible and visual alarm or send a warning message to the control platform.

[0113] The collaborative communication module aims to achieve data synchronization and command transmission between the blower room, hot blast stove operators, and the blast furnace workshop, with a latency of less than or equal to 100 milliseconds. This module is crucial for seamless integration of various operational processes. It can build high-speed, reliable data transmission channels through various methods such as industrial Ethernet, fiber optic communication, or wireless communication. For example, it can employ Message Queuing Telemetry Transmission (MQTT) or OPC UA protocols to ensure real-time and accurate sharing of critical information such as air pressure, air volume, furnace condition parameters, and operating commands among different operators, thereby supporting collaborative decision-making and rapid response.

[0114] The blast furnace condition early warning module monitors parameters such as furnace temperature and internal pressure in real time, and automatically sends early warning information when these parameters exceed set thresholds. This module continuously acquires key operating parameters of the blast furnace through a data interface with the blast furnace production control system. It has built-in preset thresholds and judgment logic. Once abnormal fluctuations in parameters such as furnace temperature or internal pressure are detected—for example, a temperature fluctuation greater than ±10℃ or abnormal internal pressure—the early warning mechanism is immediately triggered. This is done through audible and visual alarms, SMS notifications, or pop-up windows on the control platform to promptly alert relevant operators to changes in the furnace condition.

[0115] The hazard management module records inspection information, hazard reports, handling processes, and acceptance results, and generates closed-loop management reports. This module provides a structured platform for managing potential risks in equipment and operations. Operators and equipment maintenance teams can use this module to input problems discovered during daily inspections, report hazards, and track the progress of hazard handling, including responsible parties, handling measures, completion deadlines, and final acceptance results. By generating closed-loop management reports, the entire hazard management process can be visualized, monitored, and analyzed, promoting continuous improvement.

[0116] The emergency response module stores emergency handling procedures for abnormal operating conditions. When an emergency is triggered, it automatically pushes operation instructions and simultaneously controls the basic status of the fan and valves. This module has pre-set detailed handling plans for abnormal operating conditions such as automatic venting of the equalizing valve, severe air leakage from the #3 combustion valve, or a sudden drop in air pressure greater than ±5 kPa. When the system detects these abnormalities, the emergency response module can quickly activate and automatically execute preset control actions, such as adjusting the fan frequency, closing or opening specific valves, while simultaneously pushing detailed emergency operation steps and precautions to the operators, guiding them to intervene manually and ensuring that the operating conditions are restored to stability in the shortest possible time.

[0117] This application's solution systematizes, automates, and integrates various operations and monitoring links in the hot blast stove blast pressure stabilization control method, significantly improving control accuracy, response timeliness, and operational reliability. The responsibility management module ensures standardized operating procedures and clear responsibilities; the blast pressure regulation module and valve monitoring module enable real-time perception and precise control of key equipment status; the collaborative communication module ensures seamless information flow and efficient command execution between various operating positions; the furnace condition early warning module and hazard management module provide a comprehensive risk monitoring and management mechanism; and the emergency response module provides rapid and automated response in case of emergencies. The organic combination of these modules means that blast pressure control throughout the blast stove blasting process no longer relies on purely manual experience, but is assisted or even led by an intelligent system, effectively avoiding blast pressure fluctuations caused by human factors and significantly improving blast stove blasting efficiency and blast furnace production stability.

[0118] The following is a concrete example. This system can be deployed in a distributed control system (DCS) or programmable logic controller (PLC) network. The responsibility control module can be a web-based application integrated into the factory's enterprise resource planning (ERP) system to manage employee qualifications, training records, and electronic work instructions. The air pressure regulation module can be implemented by a high-speed PLC, which directly controls the frequency of the blower inverter through an analog output interface and receives a 4-20mA signal from the air pressure sensor as feedback to execute a preset PID control algorithm. The valve monitoring module receives limit switch signals from the #3 combustion valve and the equalizing valve through a digital input module connected to the PLC. It also obtains valve opening information through an intelligent valve positioner and monitors the valve sealing status through a diagnostic interface. The collaborative communication module can use an industrial Ethernet (such as Profinet or Ethernet / IP) as the backbone network, connecting the PLC in the blower room, the human-machine interface (HMI) in the hot blast stove control room, and the SCADA system in the blast furnace workshop, ensuring data packets are transmitted within 100 milliseconds. The furnace condition early warning module can be integrated into the SCADA system. By configuring alarm thresholds and logic, when the blast furnace temperature or internal pressure data exceeds the range, an alarm window will automatically pop up on the HMI and trigger an audible and visual alarm. The hazard management module can be a standalone maintenance management software, allowing operators to submit inspection reports and hazard information via the HMI or mobile terminal, which will then be automatically assigned to the appropriate maintenance personnel for processing and tracking. The emergency handling module can be a functional block in a PLC or DCS, pre-programmed with control sequences for different abnormal operating conditions. For example, when a sudden drop in wind pressure is detected, it automatically sends a command to increase the frequency of the blower inverter and a closing command to the relevant valves, while simultaneously displaying emergency operation guidelines on the HMI.

[0119] Through the above technical solution, this application provides a highly automated and integrated hot blast stove blast pressure stabilization control system. This system effectively overcomes the limitations of traditional manual operation in terms of accuracy, response speed, and consistency, ensuring that the blast pressure remains within the target range during the critical production stage of hot blast stove blasting. This significantly reduces the risk of blast furnace instability caused by blast pressure fluctuations, improving production safety, stability, and efficiency. Simultaneously, through accountability and hazard management mechanisms, it promotes standardized operation and continuous improvement, providing a solid guarantee for the long-term stable operation of the blast furnace.

[0120] In some other embodiments, this application proposes a hot blast stove changeover air pressure stabilization control system, wherein the air pressure regulation module is designed to achieve precise adjustment of the blower frequency and has rapid response capability. However, without clear definitions of the regulation accuracy and operating range, it may be difficult to effectively cope with small air pressure fluctuations during actual stove changeover, or it may not be able to provide sufficient regulation capability under specific operating conditions. This may result in insufficiently precise air pressure control, affecting the stability and safety of the stove changeover process.

[0121] In this regard, this application further proposes that the fan frequency adjustment accuracy of the aforementioned air pressure regulation module is ±0.1Hz, enabling precise adjustment of the fan frequency within the 42-48Hz range. The ±0.1Hz fan frequency adjustment accuracy refers to the minimum adjustment step or error range achievable by the system during frequency adjustment, which is 0.1Hz. This high-precision adjustment capability is crucial for maintaining stable air pressure during hot blast stove replacement, allowing for rapid correction of minor air pressure fluctuations through fine adjustments to the fan frequency, preventing excessive deviations from the target value. This precision can be achieved using a high-resolution digital-to-analog converter (DAC) and a high-precision frequency controller. For example, the controller may employ a 16-bit or higher DAC, combined with a precise PID control algorithm, to convert digital control signals into analog voltage or current, thereby driving the frequency converter to precisely control the fan motor speed, achieving a frequency adjustment step of 0.1Hz. Alternatively, this can be achieved by integrating advanced sensor technology and a feedback control system. For example, a high-sensitivity wind pressure sensor can be used to monitor wind pressure in real time and feed the data back to the controller. The controller calculates the required frequency adjustment based on a preset control strategy and algorithm, and then fine-tunes it using a high-precision frequency converter actuator, ensuring that each adjustment is accurate to 0.1Hz. Achieving precise adjustment of the fan frequency within the 42-48Hz range means that the system can maintain an adjustment accuracy of ±0.1Hz within this frequency range. This frequency range covers the wind pressure requirements under various operating conditions that may be encountered during hot blast stove replacement, ensuring precise adjustment within this critical range and guaranteeing the system's adaptability and stability under different loads and operating conditions. This can be achieved by selecting a frequency converter with a rated output frequency range covering 42-48Hz and maintaining high control accuracy throughout the entire operating range. The control algorithm and power module design within the frequency converter should support stable and efficient operation within this frequency range and respond to precise commands from the control system. In addition, the characteristics of the fan itself must also match this frequency range. The fan should have good operating efficiency and stability at the speed corresponding to 42-48Hz to avoid resonance or a sudden drop in efficiency at a specific frequency.

[0122] The aforementioned air pressure regulation module significantly improves the performance of the entire hot blast stove changeover air pressure stability control system by limiting the fan frequency regulation accuracy to ±0.1Hz and ensuring precise regulation within a specific frequency range of 42-48Hz. When the system receives an operation command or automatically adjusts based on real-time air pressure data, the air pressure regulation module can increase or decrease the fan frequency in extremely small steps (0.1Hz). This fine-tuning capability allows the system to respond instantly and accurately to minute fluctuations in air pressure, avoiding overshoot or undershoot caused by excessively large adjustment steps, thus more effectively maintaining the air pressure near the target value. Simultaneously, limiting the precise regulation range to 42-48Hz means that under the critical and variable air pressure demand conditions of hot blast stove changeover, the system always has sufficient adjustment margin to cope with increases or decreases in air pressure. Whether it's a rapid increase in air pressure to compensate for a sudden drop or a slow decrease in air pressure to avoid overpressure, precise control can be achieved within this range. This high-precision and precise adjustment capability within a specific range, in conjunction with other modules of the system (such as valve monitoring module and furnace condition early warning module), ensures that the air pressure can be stably controlled throughout the entire furnace changeover process, even in the face of complex changes in operating conditions, thereby guaranteeing the smooth progress of the furnace changeover operation and the safety of blast furnace production.

[0123] The following example illustrates how the aforementioned wind pressure regulation module can be implemented using a combination of a high-performance industrial-grade frequency converter and a programmable logic controller (PLC). The PLC acts as the main controller, receiving operating commands from the central control platform and real-time feedback data from the wind pressure sensors. Internally, the PLC runs an optimized PID control algorithm that calculates the required fan frequency adjustment based on the deviation between the target and actual wind pressure. This adjustment is then sent to the frequency converter via a high-speed digital communication interface. The frequency converter drives the fan motor; its internal microprocessor and power electronics accurately convert the frequency commands from the PLC into the motor's drive frequency. To achieve a regulation accuracy of ±0.1Hz, a frequency converter with high-resolution frequency output capability can be selected; for example, its internal frequency setting resolution can reach 0.01Hz, ensuring that the actual output frequency accurately responds to command changes of 0.1Hz. Furthermore, while the inverter's rated output frequency range can cover 0-50Hz, through software configuration and parameter optimization, it ensures a consistently stable frequency regulation accuracy of ±0.1Hz within its core operating range of 42-48Hz. For example, when the wind pressure is slightly higher than the target value, the PLC will instruct the inverter to reduce the fan frequency by 0.1Hz; when the wind pressure is slightly lower than the target value, it will instruct it to increase it by 0.1Hz, thereby achieving refined management of wind pressure.

[0124] Through the aforementioned technical solution, the air pressure regulation module can adjust the blower frequency within a specific frequency range of 42-48Hz with an extremely high precision of ±0.1Hz. This precise control capability enables the system to promptly and accurately compensate for minute air pressure fluctuations that occur during hot blast stove replacement, effectively avoiding excessive air pressure fluctuations and thus significantly improving the stability of air pressure control. During the replacement operation, even if the air pressure is affected by factors such as changes in furnace conditions and valve switching, the module can precisely maintain the air pressure near the target value by fine-tuning the blower frequency, greatly reducing the risk of abnormal furnace conditions caused by unstable air pressure, ensuring the smooth progress of the replacement process and the continuity and safety of blast furnace production.

[0125] In other embodiments, this application proposes a system for implementing the above-mentioned hot blast stove changeover air pressure stability control method. This system includes a valve monitoring module capable of real-time acquisition of the opening and closing status, sealing performance, and trigger logic data of the No. 3 combustion valve and the equalizing valve, and possesses an abnormal alarm function. However, in actual operation, relying solely on this basic monitoring data may not be sufficient to detect potential deterioration trends or minor faults in key valve components in advance. For example, slow erosion of refractory materials, gradual aging of seals, or sluggish response of solenoid valves. If these problems are not promptly warned and addressed, they may lead to sudden failures at critical moments during the changeover, thereby affecting air pressure stability and the safety of the changeover operation.

[0126] In this regard, this application further proposes that the aforementioned valve monitoring module can monitor in real time the condition of the refractory material of the No. 3 combustion valve, the aging degree of the seals, the action response time of the solenoid valve of the pressure equalizing valve, and the connection status of the control circuit.

[0127] The condition of the refractory material in the No. 3 combustion valve refers to the integrity, wear, or corrosion status of the refractory material inside the No. 3 hot blast stove gas combustion valve, which directly affects combustion efficiency and valve life. Possible implementation methods include: real-time monitoring of the temperature distribution on the refractory surface using an infrared thermal imager installed outside the valve body; abnormally high temperature areas may indicate localized wear or spalling of the refractory material; or, periodic or online detection of refractory thickness changes and internal defects using ultrasonic flaw detection technology. The aging degree of the seals refers to the changes in the physical properties of the sealing components in the No. 3 combustion valve and the equalizing valve, used to prevent media leakage, due to long-term use, high temperature, pressure, or chemical corrosion, such as changes in elasticity, hardness, and dimensions. Possible implementation methods include: monitoring minute pressure fluctuations or leakage within the sealing cavity by installing miniature pressure sensors in the sealing area to assess the declining trend of sealing performance; or, periodically inspecting the surface of the seals using integrated visual sensors and image processing algorithms to identify signs of aging such as cracks, deformation, or wear. The response time of the equalizing valve solenoid valve refers to the time required for the solenoid valve of the equalizing valve to actually start or complete its action from receiving a control signal. Possible implementation methods include: precisely measuring the time interval from the issuance of an electrical signal to the start or end of mechanical action by setting sensors at the electrical input terminal and the mechanical moving parts of the valve core; or, inferring its action response characteristics by analyzing the current or voltage waveform changes of the solenoid valve coil and combining them with a preset model. The control circuit connection status refers to the integrity, contact reliability, and presence of abnormalities such as short circuits, open circuits, or loose connections in the electrical circuits connecting the #3 combustion valve and the equalizing valve, including the solenoid valves, sensors, and other actuators. Possible implementation methods include: monitoring the resistance or capacitance changes of the control circuit in real time using online impedance measurement technology; abnormal changes may indicate loose or damaged connections; or, periodically sending test signals and receiving feedback through an integrated fault diagnosis unit to verify the continuity of the circuit and the quality of signal transmission. Real-time monitoring refers to the continuous or high-frequency acquisition, analysis, and evaluation of the above statuses and parameters to promptly detect abnormalities and take appropriate measures. Possible implementation methods include: using distributed sensor networks and high-speed data acquisition cards to synchronously transmit various sensor data to the central processing unit for real-time analysis; or, using edge computing devices to perform preliminary data processing and anomaly judgment on-site, and only uploading key information or early warning data to the central control platform.

[0128] This application's solution expands the monitoring range and depth of the valve monitoring module, enabling real-time monitoring of the refractory material condition and seal aging of the No. 3 combustion valve, as well as the solenoid valve response time and control circuit connection status of the pressure equalizing valve. Specifically, the valve monitoring module integrates multiple sensors and data acquisition technologies to continuously acquire real-time data streams of these key parameters. For example, for the No. 3 combustion valve, temperature, acoustic, or visual sensors acquire information on refractory wear and cracks, while pressure or leakage sensors assess seal performance degradation. For the pressure equalizing valve, a precise timer and electrical signal analyzer measure the solenoid valve's response speed, and circuit diagnostic tools check the integrity of the control circuit. This detailed monitoring data is transmitted in real-time to the analysis unit of the valve monitoring module, which processes and analyzes the data using preset algorithms and models. When any parameter deviates from the normal range or shows a deterioration trend, the valve monitoring module can immediately identify it and generate an early warning message. This refined real-time monitoring mechanism allows the system to detect potential valve failures at a deeper and earlier stage, rather than relying solely on valve opening / closing status or simple sealing performance anomalies. In this way, the valve monitoring module can not only provide real-time fault information, but more importantly, it can provide the data support required for predictive maintenance, thereby intervening before a fault occurs, ensuring the reliable operation of the No. 3 combustion valve and the pressure equalization valve during the furnace changeover process, and thus ensuring the effective implementation of the entire hot blast stove furnace changeover air pressure stability control method.

[0129] As a specific implementation, the valve monitoring module described above can integrate multiple sensors and data processing units. For example, for monitoring the refractory condition of the #3 combustion valve, multiple non-contact infrared temperature sensors can be installed in key areas outside the combustion valve to acquire real-time temperature distribution maps of the refractory surface. Image processing algorithms can then be used to identify localized hot spots or areas with abnormal temperature gradients, which may indicate erosion or spalling of the refractory. Simultaneously, miniature differential pressure sensors can be placed around the seal to continuously monitor the pressure difference across the seal. When the pressure difference exceeds a preset threshold, it indicates a possible minor leak in the seal, and historical data can be used to analyze its aging trend. For monitoring the response time of the equalizing valve's solenoid valve, a high-precision timer can be embedded in the solenoid valve's control circuit and linked with the valve core's mechanical position sensor (e.g., a Hall sensor or photoelectric sensor) to accurately record the time from the issuance of the control signal to the valve core starting to move or fully positioning itself. This data can then be compared with a standard response time. Furthermore, monitoring the control circuit connection status can be achieved by installing an online impedance monitoring unit at key connection points. This unit periodically sends low-pressure test signals and measures the circuit impedance. Any significant impedance change may indicate a loose connection or circuit damage. All of this sensor data is transmitted in real time to the central processing unit of the valve monitoring module via industrial Ethernet or wireless communication modules, where it performs data fusion, trend analysis, and anomaly detection.

[0130] Through the aforementioned technical solution, the valve monitoring module can perform real-time and precise monitoring of the refractory material condition and seal aging of the No. 3 combustion valve, as well as the solenoid valve response time and control circuit connection status of the equalizing valve. This allows the system not only to promptly detect immediate valve failures, but more importantly, to identify potential deterioration trends and subtle fault hazards in key valve components in advance. For example, when slight wear of the refractory material occurs, seals begin to age, or the solenoid valve response time slightly increases, the system can issue an early warning, providing maintenance personnel with sufficient time for prediction and intervention. This predictive maintenance capability significantly reduces the risk of drastic air pressure fluctuations caused by sudden valve failures during furnace changeover, avoiding interruptions to furnace changeover operations or safety accidents due to valve failure. Through continuous monitoring and trend analysis of these key parameters, equipment maintenance plans can be optimized, equipment service life extended, and the No. 3 combustion valve and equalizing valve can be ensured to remain in optimal working condition throughout the entire hot blast stove furnace changeover air pressure stability control method, thereby further improving air pressure stability, operational reliability, and overall safety during the furnace changeover process.

[0131] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for stabilizing the blast pressure of a hot blast stove, characterized in that, Includes the following steps: S1: Clearly define the blower room operator as the person responsible for the air pressure control throughout the furnace replacement process and sign a responsibility agreement; set the relevant air pressure benchmark value for coke feeding as the target air pressure before furnace replacement, and set the blower benchmark frequency to 42-45Hz through the central control platform to stabilize the initial air pressure to the target value before furnace replacement, and simultaneously complete the pre-inspection of the gas combustion valve and pressure equalization valve of No. 3 hot blast stove; S2: 10 minutes before the furnace replacement, the blower room operator adjusts the blower frequency through the central control platform to precisely adjust the air pressure to the target value before the furnace replacement, and after maintaining stability for ≥5 minutes, sends the furnace replacement start command to the hot blast stove operator. S3: Start the furnace replacement operation. The hot blast stove operator switches valves according to the standardized procedure. The blower room operator is on duty throughout the process and monitors the air pressure data in real time. The air pressure is kept stable by fine-tuning the blower frequency. If the air pressure fluctuation exceeds ±2kPa, the automatic adjustment program is immediately triggered until the fluctuation returns to the threshold. S4: During the furnace replacement process, the blower room operator and the hot blast stove operator synchronize the air pressure and air volume data every 5 minutes. The equipment maintenance team monitors the sealing status of the No. 3 combustion valve and the triggering logic of the pressure equalization valve in real time. If the combustion valve is found to be leaking air or the pressure equalization valve is found to be abnormal, it is immediately fed back to the central control platform. S5: After the furnace replacement is completed, the wind pressure is continuously monitored for 30 minutes. The central control platform records the wind pressure data every 10 minutes. If the wind pressure deviates from the target value before the furnace replacement by more than ±3 kPa and the duration exceeds 5 minutes, the wind pressure compensation adjustment program is started to gradually return to the target value. S6: The blast furnace workshop monitors furnace condition parameters in real time. If the furnace temperature fluctuates by more than ±10℃, the furnace pressure is abnormal, or there is a risk of material hanging, a furnace condition warning will be sent immediately. The blower room operator will extend the air pressure stabilization time to ≥15 minutes, and the hot blast stove operator will slow down the furnace replacement speed. S7: Establish a three-level inspection mechanism: operators conduct daily inspections every hour, equipment maintenance teams conduct special inspections every week, and management departments conduct random checks every week. If any hidden dangers are found, they should be reported immediately through the hidden danger management module, and the responsible person and time limit for handling should be clearly defined. S8: If the pressure equalization valve automatically releases air, the combustion valve leaks air severely, or the air pressure drops suddenly by more than ±5 kPa during the furnace replacement process, immediately initiate the emergency handling for abnormal operating conditions, and simultaneously adjust the fan frequency and valve status. After the operating conditions stabilize, resume normal furnace replacement operations.

2. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, In step S1, the target wind pressure fluctuation benchmark threshold is set to ≤±1kPa before furnace replacement, and the fan frequency adjustment accuracy is ±0.1Hz; the pre-inspection of the gas combustion valve of No. 3 hot blast stove includes the integrity of refractory materials and the aging degree of seals, and the pre-inspection of the equalizing valve covers the inspection of solenoid valve, control circuit and trigger logic.

3. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, In step S7, the key points of the special inspection include the refractory material and sealing condition of the No. 3 combustion valve, the control circuit of the pressure equalization valve and the valve opening and closing response time, and the accuracy of the air pressure and air volume detection instruments; a comprehensive inspection is carried out once a month, and the inspection frequency is increased to once every 2 hours when the furnace condition is not good.

4. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, In step S6, after the furnace condition warning is triggered, the fan frequency adjustment range is controlled within ±0.5Hz / time, and the valve switching time difference is extended from the usual 3 seconds to 5 seconds.

5. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, In step S8, the specific method for emergency handling of abnormal operating conditions is as follows: Automatic air release from the equalizing valve: Immediately increase the fan frequency by 2-3Hz, and the hot air furnace operator simultaneously closes the manual control switch of the equalizing valve. The equipment maintenance team arrives at the site within 15 minutes to check the solenoid valve and control circuit. After troubleshooting, gradually reduce the fan frequency by ±0.3Hz / time. The No. 3 combustion valve is seriously leaking air: Immediately use high-temperature resistant sealant to temporarily seal the leak. The fan room operator should increase the fan frequency by 1-2Hz to maintain air pressure. Arrange for shutdown and maintenance within the next 2-3 weeks, and replace the refractory materials and seals. If the wind pressure drops by more than ±5 kPa: Immediately stop the furnace replacement operation and close the air supply valve. The operator in the blower room should quickly increase the blower frequency to 45-48 Hz. After the wind pressure returns to the target value before the furnace replacement and stabilizes for ≥10 minutes, restart the furnace replacement process.

6. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, The entire furnace replacement operation time is controlled within 60 minutes, the preparation and start-up time of steps S1 to S3 is controlled within 20 minutes, and the furnace replacement and stabilization time of steps S3 to S8 is controlled within 40 minutes.

7. The method for stabilizing the blast pressure of a hot blast stove according to claim 1, characterized in that, In step S5, the fan frequency adjustment range in the wind pressure compensation adjustment program is ±0.2Hz / time.

8. A system for operating the above-mentioned hot blast stove heat exchanger pressure stabilization control method, characterized in that, include: Responsibility Management Module: Stores operator job information, electronic files of responsibility agreements, and assessment standards to enable accountability. Wind pressure regulation module: Connects to the fan control system, receives operation commands to achieve precise adjustment of fan frequency, and the adjustment response time is ≤1 second; Valve monitoring module: Real-time acquisition of the opening and closing status, sealing performance and trigger logic data of No. 3 combustion valve and pressure equalization valve, and has an abnormal alarm function; Collaborative communication module: Enables data synchronization and command transmission between the blower room, hot blast stove operators, and blast furnace workshop, with a latency of ≤100ms; Blast furnace condition early warning module: Real-time monitoring of parameters such as blast furnace temperature and internal pressure, and automatic sending of early warning information when they exceed the set threshold; Hazard management module: Records inspection information, hazard reports, handling process and acceptance results, and generates closed-loop management reports; Emergency Response Module: Stores emergency response procedures for abnormal operating conditions, automatically pushes operation instructions when an emergency is triggered, and synchronously controls the basic status of fans and valves.

9. A hot blast stove pressure stabilization control system according to claim 8, characterized in that, The wind pressure regulation module has a fan frequency regulation accuracy of ±0.1Hz, which can achieve precise adjustment of the fan frequency in the range of 42-48Hz.

10. A hot blast stove pressure stabilization control system according to claim 8, characterized in that, The valve monitoring module can monitor the condition of the refractory material of the No. 3 combustion valve, the aging degree of the seals, the action response time of the pressure equalizing valve solenoid valve, and the connection status of the control circuit in real time.