Whole-process automatic control method for converter wet dedusting second venturi throat

Abstract

The invention provides a converter wet dedusting second venturi throat whole-process automatic control method, which comprises the following steps of: correcting a second venturi throat opening model according to a trend chart of flue gas quantity generated in a converter blowing period, change of oxygen supply flow and influence deviation of lance position change of an oxygen lance on the flue gas quantity, and forming a second venturi throat control model in a single-furnace converter blowing period; combining the opening value of the second venturi throat after the speed of the converter is reduced and the opening value of the second venturi throat in the speed increasing process to form a single-heat converter production cycle second venturi throat automatic control model; in consideration of the scaling phenomenon of the second-venturi throat and different initial values of the second-venturi throat during production of each furnace of steel, five initial value models of the second-venturi throat are set in the purification and cleaning period of the converter, the first mode is gradually switched to the fifth mode along with increase of the number of production furnaces, and an automatic control model of the second-venturi throat in the purification period of the single converter is formed. And after the converter is purified and cleaned, the model is manually switched to the first mode, and the complete second venturi throat control model of the converter wet dust removal system is formed.

Description

Technical Field

[0001] This invention relates to the field of steelmaking technology, and more particularly to a fully automated control method for the entire process of wet dust removal at the throat of a converter. Background Technology

[0002] In steelmaking, the converter is a crucial piece of equipment, generating significant amounts of flue gas and dust during the blowing process. This flue gas contains a large amount of carbon monoxide (CO), which has high recycling value. To achieve environmental protection and energy conservation goals, it is typically necessary to recover CO from the flue gas for use in heating related systems, while simultaneously removing the generated dust. Currently, there are two main types of flue gas dust removal in the industry: dry dust removal systems and wet dust removal systems. Wet dust removal systems adjust the flue gas volume in the system by regulating the operation of the two-way nozzle, maintaining a slightly positive pressure in the converter mouth area to prevent air from being drawn into the flue gas under negative pressure, thus preventing oxygen in the air from reacting with CO to produce carbon dioxide (CO). This reduces CO levels, leading to energy waste.

[0003] Currently, the control methods for the second-stage flue gas inlet in converter wet dust removal systems are mainly twofold: manual and automatic. The manual method relies on operators observing the furnace opening during the converter blowing process and adjusting the size of the second-stage flue gas inlet using corresponding buttons on the computer screen to control the flue gas volume and ensure a slightly positive pressure in the furnace opening area. The automatic method uses sensors installed in the furnace opening area to detect pressure changes, automatically adjusting the second-stage flue gas inlet based on these pressure variations.

[0004] However, existing technologies have some problems. While manual control offers flexibility, it is labor-intensive and prone to errors, impacting gas recovery efficiency. Automatic control, while reducing operator workload, suffers from sensor clogging and failure during converter blowing due to large amounts of smoke and slag splashing, preventing automatic throat opening adjustment from meeting production demands. Furthermore, a satisfactory solution is currently lacking in China, leaving the operation of the secondary throat in the converter's wet dust collector primarily reliant on manual adjustment. This method is not only labor-intensive, but untimely manual throat opening adjustments can affect steelmaking pyrotechnic control and the stable operation of the primary dust collector fan, thus impacting gas recovery efficiency, shortening the converter purification cycle, and reducing converter production efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a fully automated control method for the second throat of a converter wet dust collector. Through big data accumulation and model correction, combined with changes in process parameters during converter blowing, this invention achieves fully automated control of the second throat of the converter wet dust collector, thereby improving gas recovery efficiency, reducing energy consumption, and optimizing the production process.

[0006] The technical means employed in this invention are as follows: A fully automated control method for the entire process of wet dust removal at the throat of a converter includes: Based on the trend of flue gas volume and oxygen supply flow during converter blowing, and the deviation of the effect of oxygen lance position change on flue gas volume, the second throat opening model is corrected to form a second throat control model during single-furnace converter blowing. By combining the opening value of the second throat after the converter speed is reduced and the opening value of the second throat during the speed increase process, an automatic control model for the second throat of the converter production cycle for a single furnace is formed. Considering the scaling phenomenon at the converter throat, the initial value of the converter throat is different for each heat of steel production. During the converter purification and cleaning cycle, five initial value models for the converter throat are set. As the number of heats produced increases, the model is gradually switched from mode one to mode five, eventually forming an automatic control model for the converter throat within a single converter purification cycle. After the converter is purified and cleaned, the model is manually switched back to mode one, forming a complete converter wet dust removal system control model for the converter throat.

[0007] Furthermore, the two-throat control model during the single-furnace converter blowing process sets the smelting process of one heat of steel as six two-throat adjustment stages, specifically: Phase 1: No converter lance lowering signal, but iron feeding signal present; blower speed less than 1200 r / min; initial setting of the second ferroalloy throat opening value is 20%-50%. Phase Two: No converter lance signal, blower speed greater than or equal to 1200 r / min, and the opening of the second blast furnace throat increased by 15%; Phase 3: Converter lance lowering signal, converter blowing time less than 7 minutes, flue gas... When the content is greater than 8%, the opening of the throat increases by 17%; Phase 4: Converter blowing time is less than 7 minutes, and the flue gas contains... If the content is less than or equal to 8%, the opening of the throat of the second-class oral cavity increases by 20%; Phase 5: Converter blowing time is greater than or equal to 7 minutes, and the opening of the second-stage blower throat is increased by 17%; Phase Six: Fan speed reduction signal. Maintain the fan speed reduction signal and return the opening of the second throat to its initial value.

[0008] Furthermore, the initial value models for the five types of two-way throats are as follows: Mode 1: In the initial stage, the initial value of the throat opening of the second vessel in Phase 1 is set to 20%-50%; Mode 2: Early to mid-stage, the initial value for the throat opening in Phase 1 is set to 25%-55%; Mode 3: Mid-term, the initial value for the throat opening of Phase 1 is set at 30%-60%; Mode 4: In the mid-to-late stages, the initial value for the throat opening of the second vessel in Stage 1 is set to 35%-65%; Mode 5: Later stage, the initial value of the throat opening of the second text in stage one is set to 40%-70%.

[0009] Furthermore, it also includes a parameter correction step, as detailed below: The initial values ​​of oxygen lance position and oxygen supply flow rate are set, and dynamically corrected according to the changes in oxygen lance position and oxygen supply flow rate during the blowing process. Each mode parameter value takes into account the possible mid-process lance lifting and other states that may occur during production, forming a complete automatic control model for the two-way throat within a single converter production cycle.

[0010] Furthermore, it also includes abnormal situation handling procedures, as follows: There are multiple signals for steelmaking speed increase / decrease; the first signal point is selected. The converter suddenly raises its lance, and the throat control returns to stage three or other stages that meet the conditions. If the conditions are not in any of the above stages, the throat opening is 50% during the fan deceleration stage and 70% during the fan acceleration stage.

[0011] Compared with the prior art, the present invention has the following advantages: 1. This invention replaces manual adjustment of the throat opening with automatic control, reducing the workload of operators and avoiding production problems caused by human error.

[0012] 2. This invention can accurately adjust the opening of the second throat based on real-time data and preset models, ensuring stable operation of the fan under different working conditions and extending the service life of the equipment.

[0013] 3. This invention can dynamically adjust the opening of the two throats according to the production cycle, reducing equipment wear and scaling caused by untimely manual adjustment, thereby extending the converter purification cycle and reducing production delays caused by untimely manual adjustment, thus improving the converter's production efficiency.

[0014] 4. This invention reduces the amount of gas recovered and the calorific value of the gas by precisely controlling the opening of the second throat, thereby reducing the amount of wind introduced and the secondary combustion of CO.

[0015] 5. This invention can effectively control the smoke and fire during the converter blowing process, reduce pollution to the atmospheric environment, help steel plants achieve energy conservation and emission reduction goals, and is in line with the national industrial policy of developing a circular economy and sustainable development.

[0016] 6. By setting five initial value models for the two-stage smelting throat, this invention can adapt to different stages of the converter purification cycle, such as the pre-phase, pre-phase, phase, mid-phase, mid-phase, and late-phase, thereby achieving full-process automatic control of multi-furnace smelting and improving production flexibility and adaptability.

[0017] Based on the above reasons, this invention can be widely applied in fields such as steelmaking. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0022] like Figure 1 As shown, this invention provides a fully automated control method for the entire process of the two throats in a converter wet dust removal system, comprising: Based on the trend of flue gas volume and oxygen supply flow during converter blowing, and the deviation of the effect of oxygen lance position change on flue gas volume, the second throat opening model is corrected to form a second throat control model during single-furnace converter blowing. By combining the opening value of the second throat after the converter speed is reduced and the opening value of the second throat during the speed increase process, an automatic control model for the second throat of the converter production cycle for a single furnace is formed. Considering the scaling phenomenon at the converter throat, the initial value of the converter throat is different for each heat of steel production. During the converter purification and cleaning cycle, five initial value models for the converter throat are set. As the number of heats produced increases, the model is gradually switched from mode one to mode five, eventually forming an automatic control model for the converter throat within a single converter purification cycle. After the converter is purified and cleaned, the model is manually switched back to mode one, forming a complete converter wet dust removal system control model for the converter throat.

[0023] In this embodiment, through the accumulation of big data, based on the trend chart of flue gas volume and changes in oxygen supply flow during converter blowing, and the deviation of the influence of oxygen lance position changes on flue gas volume, the second-stage throat opening model is corrected to form a second-stage throat control model during a single-heat converter blowing process. Combining the second-stage throat opening values ​​after converter deceleration and during deceleration, a single-heat converter production cycle automatic control model for the second-stage throat is finally formed. Considering the characteristics of converter wet dust removal, scaling inevitably occurs at the second-stage throat. The initial value of the second-stage throat differs for each heat of steel production. During the converter purification and cleaning cycle, considering the principle of optimal efficiency, five initial value models for the second-stage throat are set. As the number of heats produced increases, the model gradually switches from mode one to mode five, ultimately achieving an automatic control model for the second-stage throat within a single converter purification cycle. After converter purification and cleaning, the model is manually switched back to mode one, forming a complete second-stage throat control model for the converter wet dust removal system. The goal is to reduce the amount of wind introduced during gas recovery, reduce secondary CO combustion, increase the calorific value of the gas, increase the amount of gas recovered, reduce energy consumption, and lower production costs.

[0024] In a specific implementation, as a preferred embodiment of the present invention, the two-throat control model during the single-furnace converter blowing process sets the smelting process of one heat of steel as six two-throat adjustment stages, see below. Figure 1 Specifically: Phase 1: No converter lance lowering signal, but iron feeding signal present; blower speed less than 1200 r / min; initial setting of the second ferroalloy throat opening value is 20%-50%. Phase Two: No converter lance signal, blower speed greater than or equal to 1200 r / min, and the opening of the second blast furnace throat increased by 15%; Phase 3: Converter lance lowering signal, converter blowing time less than 7 minutes, flue gas... When the content is greater than 8%, the opening of the throat increases by 17%; Phase 4: Converter blowing time is less than 7 minutes, and the flue gas contains... If the content is less than or equal to 8%, the opening of the throat of the second-class oral cavity increases by 20%; Phase 5: Converter blowing time is greater than or equal to 7 minutes, and the opening of the second-stage blower throat is increased by 17%; Phase Six: Fan speed reduction signal. Maintain the fan speed reduction signal and return the opening of the second throat to its initial value.

[0025] In this embodiment, based on the accumulated data of the second-stage flue gas throat adjustment in converter production and the initial model calculations, and according to the principles of stable model operation efficiency and changes in process parameters and flue gas flow, the process of smelting one heat of steel is set into six stages for second-stage flue gas throat adjustment, and segmented control is implemented. Specifically, the second-stage flue gas throat is controlled throughout the entire smelting process, from the start of converter smelting when the blower speed increases to its maximum, to the converter adding molten iron, the blowing process, waiting for tapping, and the tapping blower speed reduction. After tapping, the second-stage flue gas throat returns to its initial position to await the next heat of smelting. Data sources include the vaporization PLC, the re-blowing PLC, and the blower PLC, including blower speed, blower speed increase, blower speed decrease, blowing time, converter adding molten iron, and converter tapping. Parameter corrections are made to consider the impact on flue gas volume. Initial values ​​for oxygen lance position and oxygen supply flow are set, and dynamically adjusted during blowing based on changes in oxygen lance position and oxygen supply flow. Each mode parameter value takes into account potential issues such as mid-process lance lifting and other conditions during production, forming a complete automatic control model for the second oxygen lance throat within a single converter production cycle. Considering the characteristics of converter wet dust removal, scaling inevitably occurs at the second oxygen lance throat. The initial values ​​for the second oxygen lance throat differ for each heat of steel produced. During the converter purification and cleaning cycle, considering the principle of optimal efficiency, five initial value models for the second oxygen lance throat are set. As the number of heats produced increases, the model gradually switches from mode one to mode five, ultimately achieving an automatic control model for the second oxygen lance throat within a single converter purification cycle. After converter purification and cleaning, the model is manually switched back to mode one, forming a complete control model for the second oxygen lance throat of the converter wet dust removal system. Each stage corresponds to the pre-purification cycle, pre-middle, middle, middle-post-middle, post-post-purification cycle, and special stages. Within one converter purification cycle, the entire process of smelting multiple furnaces is automatically controlled. After the purification system is cleaned again, the system is reset to its initial position and enters the next cycle.

[0026] In specific implementation, as a preferred embodiment of the present invention, the five initial value models for the two-throat openings are as follows: Mode 1: In the initial stage, the initial value of the throat opening of the second vessel in Phase 1 is set to 20%-50%; In this embodiment, there is no converter lance lowering signal, but there is a ferroalloy charging signal; the blower speed is <1200 r / min; and the initial value of the second ferroalloy throat opening is set to 20%-50%. Phase Two: No converter lance lowering signal; blower speed ≥1200 r / min; second ferroalloy throat opening increased by 15%. Phase Three: Converter lance lowering signal; converter blowing time <7 minutes; flue gas... Content >8%, throat opening increases by 17%. Stage Four: Converter blowing <7min, flue gas... For a content ≤8%, the opening of the second-stage throat increases by 20%. Stage 5: For converter blowing ≥7min, the opening of the second-stage throat increases by 17%. Stage 6: When the blower speed reduction signal is received, maintain the blower speed reduction signal and return the opening of the second-stage throat to its initial value.

[0027] Mode 2: Early to mid-stage, the initial value for the throat opening in Phase 1 is set to 25%-55%; In this embodiment, there is no converter lance lowering signal, but there is a ferroalloy charging signal; the blower speed is <1200 r / min; and the initial value of the second ferroalloy throat opening is set to 25%-55%. Phase Two: No converter lance lowering signal; blower speed ≥1200 r / min; second ferroalloy throat opening increased by 13%. Phase Three: Converter lance lowering signal; converter blowing time <7 minutes; flue gas... Content >8%, throat opening increases by 16%. Stage Four: Converter blowing <7min, flue gas... For a content ≤8%, the opening of the second-stage throat increases by 18%. Stage 5: For converter blowing ≥7min, the opening of the second-stage throat increases by 16%. Stage 6: When the blower speed reduction signal is received, maintain the blower speed reduction signal and return the opening of the second-stage throat to its initial value.

[0028] Mode 3: Mid-term, the initial value for the throat opening of Phase 1 is set at 30%-60%; In this embodiment, there is no converter lance lowering signal, but there is a ferroalloy charging signal; the blower speed is <1200 r / min; and the initial value of the second ferroalloy throat opening is set to 30%-60%. Phase Two: No converter lance lowering signal; blower speed ≥1200 r / min; second ferroalloy throat opening increased by 11%. Phase Three: Converter lance lowering signal; converter blowing time <7 minutes; flue gas... Content >8%, throat opening increases by 15%. Stage Four: Converter blowing <7min, flue gas... For a content ≤8%, the opening of the second-stage throat increases by 18%. Stage 5: For converter blowing ≥7min, the opening of the second-stage throat increases by 15%. Stage 6: When the blower speed reduction signal is received, maintain the blower speed reduction signal and return the opening of the second-stage throat to its initial value.

[0029] Mode 4: In the mid-to-late stages, the initial value for the throat opening of the second vessel in Stage 1 is set to 35%-65%; In this embodiment, there is no converter lance lowering signal, but there is a ferroalloy charging signal; the blower speed is <1200 r / min; and the initial value of the second ferroalloy throat opening is set to 35%-65%. Phase Two: No converter lance lowering signal; blower speed ≥1200 r / min; second ferroalloy throat opening increased by 9%. Phase Three: Converter lance lowering signal; converter blowing time <7 minutes; flue gas... Content >8%, throat opening increases by 14%. Stage Four: Converter blowing <7min, flue gas... For a content ≤8%, the opening of the second-stage throat increases by 18%. Stage 5: For converter blowing ≥7min, the opening of the second-stage throat increases by 14%. Stage 6: When the blower speed reduction signal is received, maintain the blower speed reduction signal and return the opening of the second-stage throat to its initial value.

[0030] Mode 5: Later stage, the initial value of the throat opening of the second text in stage one is set to 40%-70%.

[0031] In this embodiment, there is no converter lance lowering signal, but there is a ferroalloy charging signal; the blower speed is <1200 r / min; and the initial value of the second ferroalloy throat opening is set to 40%-70%. Phase Two: No converter lance lowering signal; blower speed ≥1200 r / min; second ferroalloy throat opening increased by 7%. Phase Three: Converter lance lowering signal; converter blowing time <7 minutes; flue gas... Content >8%, throat opening increases by 13%. Stage Four: Converter blowing <7min, flue gas... For a content ≤8%, the opening of the second-stage throat increases by 18%. Stage 5: For converter blowing ≥7min, the opening of the second-stage throat increases by 13%. Stage 6: When the blower speed reduction signal is received, maintain the blower speed reduction signal and return the opening of the second-stage throat to its initial value.

[0032] In a specific implementation, as a preferred embodiment of the present invention, a parameter correction step is further included, as follows: The initial values ​​of oxygen lance position and oxygen supply flow rate are set, and dynamically corrected according to the changes in oxygen lance position and oxygen supply flow rate during the blowing process. Each mode parameter value takes into account the possible mid-process lance lifting and other states that may occur during production, forming a complete automatic control model for the two-way throat within a single converter production cycle.

[0033] In this embodiment, an initial value for the oxygen lance position is set in each mode, and the parameters of the second throat are adjusted by ±1% according to the change in the oxygen lance position during the blowing process; an initial value for the oxygen supply flow rate is set, and if the oxygen supply flow rate changes during the blowing process, it is dynamically corrected by ±1-3% according to the change.

[0034] In a specific implementation, as a preferred embodiment of the present invention, an abnormal situation handling step is also included, as follows: There are multiple signals for steelmaking speed increase / decrease; the first signal point is selected. The converter suddenly raises its lance, and the throat control returns to stage three or other stages that meet the conditions. If the conditions are not in any of the above stages, the throat opening is 50% during the fan deceleration stage and 70% during the fan acceleration stage.

[0035] Example The converter production purification cycle is in its early stages. The initial value of the second oxygen lance opening is set at 50%, the initial value of the oxygen lance position is 1.8m, and the initial value of the oxygen supply flow rate is set at 38000N. / h; When the converter is ready for production, the blower speed is increased from the idle speed of approximately 200-300 r / min to the blowing speed of 1300-1400 r / min. When the blower speed is below 1200 r / min, the system is in Stage 1, with the second nozzle opening at 50%. When the blower speed is ≥1200 r / min, it enters Stage 2, and the second nozzle opening is adjusted to 65%. When blowing begins after the converter lance is lowered, it enters Stage 3, and the second nozzle opening is adjusted to 67%. After the converter blowing begins, the flue gas... The content rapidly decreases from around 20% to below 1%. Under normal circumstances, the content in the flue gas within 0.5-1.5 minutes of blowing... The content can be reduced to ≤8%. Upon reaching this parameter, the system enters stage four, and the opening of the second heat throat is adjusted to 70%. When converter blowing has progressed for ≥7 minutes, it enters stage five, and the opening of the second heat throat is adjusted to 67%. After converter blowing ends, the tapping blower receives a speed-reduction signal and begins to slow down. At this point, it enters stage six, and the opening of the second heat throat returns to its initial value of 50%, preparing for the next heat. After accumulating a certain number of production heats, the system enters the early to mid-stage of the purification cycle, and the corresponding initial and stage settings are adjusted accordingly.

[0036] Note: During stages four and five of the converter operation, if the oxygen lance height increases by more than 2.2m, the system will correspondingly reduce the second oxygen lance opening by 1%; if it decreases below 2.2m, the system will increase the second oxygen lance opening to its normal value. If the oxygen supply flow rate is 38000N... / h Comparison for every increase or decrease of 2000N / h, adjust the opening of the second throat by 1% accordingly.

[0037] In summary, this invention replaces manual control with automatic control of the second-stage flue opening, reducing the workload of operators, stabilizing the operation of the primary dust collector fan, extending the converter purification cycle, controlling the flue gas in front of the converter, increasing gas recovery, and improving the calorific value of the gas. Calculations and gas calorific value analysis show that gas recovery is increased by 10%. The steel, with a calorific value of 1500 kcal, yields a gas recovery benefit of 10.3267 million yuan based on a production volume of 10.8 million tons. After the automatic adjustment of the Venturi tube in the converter primary dust removal system was put into use, the converter blowing smoke and fire became controllable, reducing atmospheric pollution, protecting the ecological balance, and helping steel plants achieve their energy conservation and emission reduction goals. This invention has significant potential for widespread application in steel enterprises using wet dust removal in converters.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automated control method for the entire process of wet dust removal at the throat of a converter, characterized in that, include: Based on the trend of flue gas volume and oxygen supply flow during converter blowing, and the deviation of the effect of oxygen lance position change on flue gas volume, the second throat opening model is corrected to form a second throat control model during single-furnace converter blowing. By combining the opening value of the second throat after the converter speed is reduced and the opening value of the second throat during the speed increase process, an automatic control model for the second throat of the converter production cycle for a single furnace is formed. Considering the scaling phenomenon at the converter throat, the initial value of the converter throat is different for each heat of steel production. During the converter purification and cleaning cycle, five initial value models for the converter throat are set. As the number of heats produced increases, the model is gradually switched from mode one to mode five, eventually forming an automatic control model for the converter throat within a single converter purification cycle. After the converter is purified and cleaned, the model is manually switched back to mode one, forming a complete converter wet dust removal system control model for the converter throat.

2. The fully automated control method for the entire process of the second throat of a converter wet dust removal system according to claim 1, characterized in that, The two-throat control model during the single-furnace converter blowing process sets the smelting of one heat of steel into six two-throat adjustment stages, specifically: Phase 1: No converter lance lowering signal, but iron feeding signal present; blower speed less than 1200 r / min; initial setting of the second ferroalloy throat opening value is 20%-50%. Phase Two: No converter lance signal, blower speed greater than or equal to 1200 r / min, and the opening of the second blast furnace throat increased by 15%; Phase 3: Converter lance lowering signal, converter blowing time less than 7 minutes, flue gas... When the content is greater than 8%, the opening of the throat increases by 17%; Phase 4: Converter blowing time is less than 7 minutes, and the flue gas contains... If the content is less than or equal to 8%, the opening of the throat of the second-class oral cavity increases by 20%; Phase 5: Converter blowing time is greater than or equal to 7 minutes, and the opening of the second-stage blower throat is increased by 17%; Phase Six: Fan speed reduction signal. Maintain the fan speed reduction signal and return the opening of the second throat to its initial value.

3. The fully automated control method for the entire process of the second throat of a converter wet dust removal system according to claim 1, characterized in that, The initial value models for the five types of two-way throats are as follows: Mode 1: In the initial stage, the initial value of the throat opening of the second vessel in Phase 1 is set to 20%-50%; Mode 2: Early to mid-stage, the initial value for the throat opening in Phase 1 is set to 25%-55%; Mode 3: Mid-term, the initial value for the throat opening of Phase 1 is set at 30%-60%; Mode 4: In the mid-to-late stages, the initial value for the throat opening of the second vessel in Stage 1 is set to 35%-65%; Mode 5: Later stage, the initial value of the throat opening of the second text in stage one is set to 40%-70%.

4. The fully automated control method for the entire process of the second throat of a converter wet dust removal system according to claim 1, characterized in that, It also includes a parameter correction step, as detailed below: The initial values ​​of oxygen lance position and oxygen supply flow rate are set, and dynamically corrected according to the changes in oxygen lance position and oxygen supply flow rate during the blowing process. Each mode parameter value takes into account the mid-process lifting of the lance and other states that occur during production, forming a complete automatic control model for the two lance throats within a single converter production cycle.

5. The fully automated control method for the entire process of the second throat of a converter wet dust removal system according to claim 1, characterized in that, It also includes abnormal situation handling steps, as follows: There are multiple signals for steelmaking speed increase / decrease; the first signal point is selected. The converter suddenly raises its lance, and the throat control returns to stage three or other stages that meet the conditions. If the conditions are not in any of the above stages, the throat opening is 50% during the fan deceleration stage and 70% during the fan acceleration stage.

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