Multi-parameter coordinated control converter full-process unmanned intelligent smelting method

Abstract

The invention discloses a converter full-process unmanned intelligent smelting method with multi-parameter coordinated regulation and control, and belongs to the technical field of steel smelting intellectualization. The invention aims to solve the problems of high manual dependency, low efficiency and high risk in the existing steelmaking operation, and provides a converter unmanned intelligent smelting method based on full-flow closed-loop control, so that automatic operation and dynamic adjustment from starting to ending of a heat are realized. The converter intelligent smelting method which covers the whole process of blowing, alloy batching, furnace mouth treatment and tapping and deslagging and is fused with closed-loop control logic is suitable for automatic upgrading and intelligent manufacturing and reconstruction of converter steelmaking production lines of modern iron and steel enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent steel smelting, in particular to a multi-parameter collaborative control-based whole-process unmanned intelligent smelting method for a converter. BACKGROUND

[0002] As a pillar industry of the national economy, the steel industry is the core link of steel production, and the smelting efficiency, product quality and production safety directly determine the market competitiveness of enterprises. With the rapid development of intelligent manufacturing technology, the traditional converter steelmaking mode has gradually exposed many problems to be solved, which has been difficult to adapt to the efficient, low-consumption and safe needs of modern steel production.

[0003] The traditional converter steelmaking operation highly depends on manual experience. From the calculation of the ratio of molten iron and scrap steel in the furnace start-up stage, to the adjustment of the oxygen lance position, the control of the bulk material addition amount in the blowing process, to the calculation of alloy ingredients, the cleaning of the furnace mouth, the tapping and slag pouring, etc., all need the operator to make real-time judgments and manual operations in the high-risk environment in front of the furnace. This mode of relying on manual work has significant limitations: on the one hand, manual decision-making is easily affected by factors such as experience differences and fatigue states, resulting in insufficient smelting parameter control accuracy, large fluctuations in molten steel composition, and serious impact on product consistency; on the other hand, the time-consuming of manual coordination of each process flow is long, and the converter operation rate is low, which is difficult to meet the needs of large-scale continuous production.

[0004] At the same time, there are harsh environments such as high temperature, high dust, high noise and toxic and harmful smoke in the converter steelmaking site. The operators are exposed to this environment for a long time, not only with great labor intensity, but also facing the safety risks of burns, splashes, gas poisoning, etc., and the incidence of safety production accidents is high.

[0005] In order to solve the above problems, the industry has tried to introduce some automatic equipment (such as automatic feeding device, oxygen lance positioning system, etc.), but most of them are local automation of a single link, and have not formed a whole-process collaborative control system, still need a lot of manual intervention to connect each process, and have not fundamentally solved the core pain points of high dependence on manual work, low efficiency and high risk. Therefore, it is an urgent need for the intelligent transformation of the steel smelting industry to develop a whole-process unmanned intelligent smelting method covering the whole process of converter steelmaking based on multi-parameter collaborative control, to realize automatic operation and dynamic closed-loop control from the start to the end of the furnace. SUMMARY

[0006] The purpose of the present application is to provide a multi-parameter collaborative control-based whole-process unmanned intelligent smelting method for a converter.

[0007] To achieve the above purpose, the present application adopts the following technical solutions: In a first aspect of the present application, a multi-parameter collaborative control-based whole-process smelting method for a converter is provided, comprising the following steps: Ladle startup, blowing, alloy batching, ladle mouth treatment, smelting status determination, steelmaking, slag pouring, slag splashing.

[0008] Furthermore, in the ladle startup stage, after the converter completes the addition of hot metal and scrap, collect the hot metal composition, hot metal weight, and scrap weight data, and generate a smelting plan including blowing parameters and alloy ratio.

[0009] Further blowing stage: (1) The oxygen lance automatically descends to the preset lance position of 2.0 - 3.0 m, and oxygen is turned on for ignition blowing. At the same time, collect the temperature and oxygen flow data in the furnace in real time, and dynamically fine-tune the lance position of the oxygen lance; (2) When blowing reaches 1 minute and 30 seconds, the hood descends to the lower limit position, 1.0 - 1.5 m away from the ladle mouth; (3) When blowing reaches 12 minutes, the hood automatically rises to the upper limit position, 3.0 - 4.0 m away from the ladle mouth, until the blowing ends; (4) During the blowing process, adjust the addition amounts of bulk lime and dolomite according to the composition in the furnace to achieve dynamic batching.

[0010] Furthermore, during alloy batching, based on the target steel composition, steelmaking volume, and alloy element recovery rate, accurately calculate the required alloy amount and complete automatic weighing. The specific calculation logic is as follows: First, calculate the addition amount of silicomanganese according to the silicon target value, then calculate the high manganese supplement amount based on the manganese increment brought by silicomanganese, and synchronously calculate the alloy carburizing amount to ensure accurate composition.

[0011] Furthermore, in the ladle mouth treatment stage: (1) After the blowing ends, raise the oxygen lance and turn off the oxygen; (2) 4 seconds after the oxygen is turned off, lower the oxygen lance to the lance position for stabbing the ladle mouth at 7.5 - 8.5 m, turn on the oxygen at a pressure of 0.6 - 1.0 MPa, and purge the ladle mouth for 10 - 20 seconds to remove the adhering steel slag at the ladle mouth; (3) After the purging is completed, when the oxygen lance is raised above the waiting position of 10 - 15 m, the slag scraper closes; the oxygen lance continues to be raised to the upper limit position of 15 - 20 m and stops, and the slag scraper opens synchronously to complete the cleaning of the ladle mouth.

[0012] Furthermore, for smelting status determination: After the oxygen blowing ends, wait for 3 minutes. The system makes a determination based on the composition detection data and the preset threshold, and processes it in three cases: (1) If the composition detection returns within 3 minutes and the determination is qualified, steelmaking is carried out; (2) If the composition detection returns within 3 minutes and the determination is unqualified, adjust the composition and re-determine; (3) If the composition data does not return within 3 minutes, the determination is qualified, and steelmaking is carried out; if the composition returns unqualified after steelmaking, the process is interrupted.

[0013] Furthermore, steel production: (1) After the steel is deemed qualified, the tapping pump is started and the converter begins to shake. (2) When the converter is rocked to -15°, the sliding plate is closed to prevent molten steel from flowing out prematurely; when the converter is rocked to the preset tapping position of 30°-45°, the sliding plate is opened to start tapping steel; (3) After the molten steel is discharged, the slide plate is opened again when the converter is shaken to -60° to discharge the residual steel slag; then it is shaken back to -15° and paused for 5 seconds to ensure that the steel slag is discharged; finally, when it returns to zero, the tapping pump is turned off and automatic deoxidation and alloying are completed simultaneously.

[0014] Furthermore, after tapping, the converter is raised to the zero position and waits for more than 4 seconds before starting the slag removal process. (1) Pause when the converter is tilted to more than 100°; adjust the angle by 1° each time thereafter, with an interval of 3 seconds; (2) After the slag pouring angle reaches 105° or more and stays for 5 seconds, the furnace is automatically lifted back to the zero position to complete the slag pouring.

[0015] Furthermore, splatter: Return the converter to zero and wait for 4 seconds. The nitrogen pressure is 1.0-1.5 MPa, the lance position is 1.5-2.0 m, and the duration is 5-10 minutes. After the slag splashing is completed, lift the lance and turn off the nitrogen.

[0016] Furthermore, at the end of the furnace cycle, the furnace cycle ends after the oxygen lance is raised to the waiting position or above.

[0017] The beneficial effects of this invention are: 1. High precision of closed-loop control: Real-time data feedback and dynamic adjustment logic are introduced in each link, the qualified rate of molten steel composition is increased to more than 99%, and the defective product rate is greatly reduced; 2. Complete automation: Covering the entire process from furnace start-up to furnace end, only manual intervention is required at the furnace end stage to trigger a signal, reducing personnel by more than 60% and lowering labor costs; 3. Significantly improved production efficiency: Standardized automated processes reduce manual coordination time, increase converter operation rate by 15%-20%, and adapt to the needs of large-scale production; 4. Safety and environmental optimization: Operators do not need to enter the high-risk environment in front of the furnace, reducing labor intensity by 70%, while reducing dust and flue gas emissions, which meets the requirements of green manufacturing; 5. Adaptable to intelligent manufacturing: It can interface with enterprise MES systems and IoT platforms to achieve data interconnection and provide core technical support for the construction of intelligent factories in steel enterprises. Detailed Implementation

[0018] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] Currently, steel mills generally adopt a collaborative operation model of "ground commander + crane operator + furnace operator" in their converter steelmaking workshops. This model has three major pain points: 1. The work process relies on manual coordination, and the production efficiency is significantly affected by the proficiency and experience of the staff. The overall operating rate is low, making it difficult to adapt to the needs of large-scale, high-paced production. 2. The lack of standardization in manual operations makes key processes such as steel composition adjustment and oxygen lance position control prone to human error, leading to frequent accidents such as steel splashing and unqualified composition, which seriously affects production stability and product quality consistency. 3. The furnace front environment is constantly exposed to high temperature, high dust and high noise, which makes the labor intensity of operators high and exposes them to safety risks such as burns and dust hazards. At the same time, labor costs continue to rise, which goes against the trend of intelligent transformation in the steel industry.

[0020] With the rapid development of artificial intelligence, automatic control, and multi-sensor fusion technologies, constructing an unmanned control system for the entire steelmaking process has become technically feasible, provided that production safety and process smooth operation are ensured. This invention, by introducing closed-loop control logic and adjusting parameters at each stage in real time, can significantly improve production efficiency, reduce human interference, and improve the working environment, becoming a key breakthrough for the steel industry to achieve intelligent manufacturing.

[0021] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to specific embodiments.

[0022] This invention aims to solve the problems of high reliance on manual labor, low efficiency, and high risk in existing steelmaking operations. It provides a method for unmanned intelligent smelting of converters based on closed-loop control throughout the entire process, achieving automated operation and dynamic adjustment from furnace start-up to furnace termination. The specific steps are as follows: (I) Furnace Start-up Phase After the converter completes the feeding of molten iron and scrap steel, the secondary control system automatically collects data such as the composition of molten iron (Mn, Si, P, etc.), weight of molten iron, and weight of scrap steel. Based on the preset steel grade database, it matches the corresponding smelting mode (such as low alloy structural steel, high strength steel, etc.) and generates a personalized smelting scheme that includes blowing parameters and alloy ratios, forming the initial parameter input for closed-loop control.

[0023] (II) Unmanned Intelligent Blowing Stage 1. After the unmanned program is started, the oxygen lance automatically descends to the preset position (2.0-3.0m, which can be adjusted according to the steel grade) according to the initial smelting plan, and turns on the oxygen for ignition and blowing. At the same time, the furnace temperature and oxygen flow data are collected in real time, and the oxygen lance position is dynamically fine-tuned. 2. When the blowing process reaches 1 minute and 30 seconds, the fume hood automatically lowers to the lower limit (1.0-1.5m away from the furnace opening) to enhance the fume collection effect and reduce dust emissions; 3. After 12 minutes of blowing, the fume hood will automatically rise to its upper limit (3.0-4.0m from the furnace opening) to prevent it from sticking to the furnace opening until the blowing is finished; 4. During the blowing process, the automatic alloy calculation program is started simultaneously. The bulk materials (lime, dolomite, etc.) are controlled by a computer. The amount added is adjusted according to the real-time feedback data of the composition in the furnace to achieve dynamic batching.

[0024] (III) Automated Alloy Batching Stage Based on the target composition of molten steel (such as silicon, manganese, chromium, etc.), the amount of steel produced (calculated as 90% of the total weight of molten iron and scrap steel, formula: M_molten steel = (weight of collected molten iron + weight of collected scrap steel) × 90%, unit: t), and the recovery rate of alloying elements, the system automatically selects the corresponding calculation mode (such as silicon-manganese + high manganese, metallic manganese + ferrosilicon, etc.), accurately calculates the required amount of alloying elements, and completes automatic weighing. The specific calculation logic is as follows: 1. Basic parameter definitions: H + alloy name + element symbol = element recovery rate (%), W + alloy name + element symbol = element mass percentage (%), T + element name + target = element target value (%); 2. Alloy Quantity Calculation: Taking the "silicon-manganese + high-manganese" mode as an example, first calculate the amount of silicon-manganese added based on the target silicon value (Z silicon-manganese = T silicon × M molten steel × 1000 / H silicon-manganese Si / W silicon-manganese Si). Then, based on the manganese increase brought by silicon-manganese, calculate the amount of high-manganese supplement (Z high-manganese = (T manganese target - silicon-manganese increase - 0.14%) × M molten steel × 1000 / H high-manganese Mn / W high-manganese Mn). Simultaneously calculate the amount of carbon added to the alloy to ensure accurate composition.

[0025] (iv) Automated Furnace Mouth Processing Stage 1. After the blowing process is completed, the system receives a signal indicating the end of oxygen blowing, and the oxygen lance automatically lifts and shuts off the oxygen supply; 2. Four seconds after the oxygen is turned off, the oxygen lance is lowered to the furnace mouth position at 7.5-8.5m, and the oxygen is turned on to purge the furnace mouth according to the preset program (pressure 0.6-1.0MPa, duration 10-20 seconds) to remove the steel slag adhering to the furnace mouth. 3. After purging, when the oxygen lance is raised to the waiting position (10-15m) or higher, the slag scraper will automatically close; when the oxygen lance is raised to the upper limit position (15-20m) and stopped, the slag scraper will automatically open simultaneously to complete the furnace mouth cleaning.

[0026] (5) Automatic judging stage of smelting state After oxygen blowing ends, wait for 3 minutes (to ensure that the alloy has been weighed), and the system conducts closed-loop judgment based on the component detection data and preset thresholds, and processes in three cases: 1. If the component detection returns within 3 minutes and the judgment is qualified, directly trigger the automatic steel tapping program and enter the next link; 2. If the component detection returns within 3 minutes and the judgment is unqualified, the system issues an abnormal alarm, prompting the operator to switch to the manual mode, adjust the components and then re-judge; 3. If the component data does not return within 3 minutes, it is defaulted that the manual judgment is qualified and the automatic steel tapping is started; if the component returns unqualified after steel tapping, the operator switches to manual processing to interrupt the closed-loop process.

[0027] (6) Automatic steel tapping stage 1. After the judgment is qualified, the system automatically starts the steel tapping pump and the converter starts to tilt; 2. When the converter tilts to -15°, close the slide plate to prevent the molten steel from flowing out in advance; when it tilts to the preset steel tapping position (30° - 45°), open the slide plate to start steel tapping; 3. After the molten steel is drained, when the converter tilts to -60°, open the slide plate again to discharge the residual slag; then tilt back to -15° and pause for 5 seconds to ensure that the slag is completely discharged; finally, when returning to the zero position, close the steel tapping pump, synchronously complete automatic deoxidation alloying, and achieve closed-loop control of the steel tapping link.

[0028] (7) Automatic slag pouring stage After steel tapping ends, the converter automatically lifts to the zero position and waits for more than 4 seconds (to ensure the stability of the equipment), and starts the slag pouring program: 1. When the converter tilts above 100°, pause to avoid splashing caused by too fast slag pouring; subsequently, adjust at an angle of 1° each time, with an interval of 3 seconds, to achieve refined slag pouring; 2. After the slag pouring angle reaches above 105° and stays for 5 seconds (to ensure that the slag is completely poured), automatically lift the furnace back to the zero position to complete the closed-loop of slag pouring.

[0029] (8) Automatic slag splashing stage When the converter returns to the zero position and waits for more than 4 seconds, the system starts the program according to the preset slag splashing mode (nitrogen pressure 1.0 - 1.5 MPa, lance position 1.5 - 2.0 m, duration 5 - 10 minutes), and monitors the slag splashing effect in real time. After slag splashing is completed, automatically lift the lance and close the nitrogen to form a closed-loop of the slag splashing link.

[0030] (9) End stage of furnace batch After the oxygen lance is raised to the waiting position, the operator triggers the furnace end signal. The system automatically records the smelting data for this furnace (such as blowing time, alloy usage, composition data, etc.) and updates it to the database. This provides a basis for optimizing the subsequent smelting scheme and completes the closed-loop control of the entire furnace.

[0031] Meanwhile, to ensure production safety, each step (i) to (ix) above is equipped with an emergency manual switching function, which can forcibly terminate the automatic program and switch to manual control to ensure that the process is controllable in abnormal situations.

[0032] The test materials used in the embodiments of the present invention, unless otherwise specified, are all conventional test materials in the art and can be purchased through commercial channels.

[0033] Example 1 Taking the converter smelting of Q355 low-alloy structural steel as an example, the implementation process of this invention is described in detail: (I) Furnace Start-up The converter receives 130t of molten iron (composition: Mn 0.45%, Si 0.20%, P 0.08%) and 35t of scrap steel. Based on the "Q355 low alloy structural steel smelting mode", the blowing parameters (oxygen flow rate 28000m³ / h, initial lance position 1.8m) and alloy ratio requirements (Mn 1.30%, Si 0.20%) are generated.

[0034] (II) Unmanned Intelligent Blowing 1. The oxygen lance automatically lowers to the 1.8m position, ignites the oxygen, and collects the furnace temperature in real time (target 1650℃). When the temperature is higher than 1660℃, the lance position is automatically raised by 0.2m, and when it is lower than 1640℃, the lance position is lowered by 0.2m. 2. After blowing for 1 minute and 30 seconds, the fume hood automatically lowers to the lower limit of 1.2m; 3. After blowing for 11 minutes, raise the fume hood to its upper limit of 3.5m and continue blowing for 13 minutes to finish; 4. During the blowing process, add 4t of lime and 1t of dolomite.

[0035] (III) Automatic alloy batching 1. Calculation of steel output: M_molten steel = (130 + 35) × 90% = 148.5t; 2. Calculations were performed on silicon-manganese and high-manganese alloys based on alloy parameters: silicon-manganese (Si 18%, Mn 65%, recovery rate 90%), high-manganese (Mn 80%, recovery rate 92%). 3. Calculation results: Zsilicon manganese = 0.20% × 148.5 × 1000 / (90% × 18%) ≈ 1833 kg; Zsilicon manganese with added manganese = 1833 × 90% × 65% / (148.5 × 1000) ≈ 0.70%; Zhigh manganese = (1.30% - 0.70% - 0.14%) × 148.5 × 1000 / (92% × 80%) ≈ 928 kg; 4. The alloy trolley is moved to furnace #1 to complete the weighing of silicon manganese and high manganese, with the weighing error controlled within ±5kg.

[0036] (iv) Automated furnace mouth processing 1. Upon completion of the blowing process, the oxygen lance automatically lifts and the oxygen supply is shut off; 2. After 4 seconds, the oxygen lance is lowered to the 7.5m position, and oxygen is purged at the furnace inlet (oxygen pressure 0.8MPa, duration 15 seconds); 3. After purging is completed, raise the oxygen lance to the 12m waiting position and close the scraper; continue raising the oxygen lance to the 18m upper limit position and stop, then open the scraper.

[0037] (V) Automatic determination of smelting status Two minutes after oxygen blowing ends, the composition test returns P 0.020%, which meets the judgment requirements, and the steel is tapped.

[0038] (vi) Automatic steel tapping 1. Start the tapping pump, and rotate the converter to -15°C to close the sliding plate; 2. Open the slide plate when the steel tapping position is 35° and start tapping. Monitor the tapping flow rate in real time. When the flow rate is below 5t / min, tapping is nearing its end. 3. After tapping is complete (flow rate is 0), the converter is rocked to -60° to open the slide gate for slag discharge, then rocked back to -15° and paused for 5 seconds. After returning to zero, the pump is turned off.

[0039] (vii) Automatic slag removal 1. Wait 4 seconds at the zero position in the converter before starting the slag removal procedure; 2. Shake until 100°C and stop the furnace. Then shake for 1°C each time (with a 3-second interval) until 105°C is reached and hold for 5 seconds. 3. After slag removal is completed, the furnace automatically returns to the zero position, and the slag quantity detection shows a slag removal rate of 98%.

[0040] (viii) Automatic slag splashing 1. Wait 4 seconds at zero position in the converter, then start the slag splashing program (parameters as follows: nitrogen pressure 1.2MPa, lance position 1.8m-1.5m-1.0m, duration 3 minutes); 2. After slag splashing is completed, lift the lance and turn off the nitrogen. The furnace lining test shows that the slag splashing thickness meets the standard.

[0041] (ix) End of furnace run The oxygen lance is raised to the 12m waiting position, the furnace cycle ends, and this smelting is completed.

[0042] The entire smelting process took 30 minutes, 5 minutes shorter than the traditional manual method, with a 100% component qualification rate. Operators only participated at the end of the furnace cycle, achieving unmanned intelligent smelting under closed-loop control throughout the entire process.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-parameter synergistically controlled converter full sequence smelting method, characterized in that, The method comprises the following steps: The furnace start-up, blowing, alloy ingredient, furnace mouth treatment, smelting state determination, tapping, slagging, and splashing are included.

2. The multi-parameter synergistically regulated converter full sequence smelting process according to claim 1, characterized in that, In the furnace start-up stage, after the converter completes the charging of molten iron and scrap steel, the composition of the molten iron, the weight of the molten iron, and the weight of the scrap steel are collected, and a smelting scheme including blowing parameters and alloy ratio is generated.

3. The multi-parameter synergistically regulated converter full sequence smelting process according to claim 1, characterized in that, The blowing stage: (1) The oxygen lance is automatically lowered to a preset lance position of 2.0-3.0 m, and the oxygen is turned on for ignition blowing, while the temperature in the furnace and the oxygen flow data are collected in real time, and the oxygen lance position is dynamically adjusted; (2) When blowing for 1 minute and 30 seconds, the smoke hood is lowered to the lower limit position to a distance of 1.0-1.5 m from the furnace mouth; (3) When blowing for 12 minutes, the smoke hood is automatically raised to the upper limit position to a distance of 3.0-4.0 m from the furnace mouth until the blowing is completed; (4) During the blowing process, the amount of bulk lime and dolomite is adjusted according to the composition in the furnace to realize dynamic ingredient.

4. The multi-parameter synergistically regulated converter full sequence smelting process according to claim 1, characterized in that, When the alloy is added, based on the target composition of the molten steel, the tapping amount, and the alloy element recovery rate, the required alloy amount is accurately calculated and automatically weighed, and the specific calculation logic is as follows: First, the silicon-manganese addition amount is calculated according to the silicon target value, then the high-manganese supplement amount is calculated according to the manganese increment brought by silicon-manganese, and the alloy carbon increment is calculated synchronously to ensure the accuracy of the composition.

5. The multi-parameter synergistically regulated converter full sequence smelting process according to claim 1, characterized in that, The furnace mouth treatment stage: (1) After the blowing is completed, the oxygen lance is raised and the oxygen is turned off; (2) After the oxygen is turned off for 4 seconds, the oxygen lance is lowered to a lance position of 7.5-8.5 m for pressing the furnace mouth, the oxygen is turned on at a pressure of 0.6-1.0 MPa, and the furnace mouth is blown for 10-20 seconds to remove the adhered steel slag; (3) After the blowing is completed, the oxygen lance is raised to a position of 10-15 m above the waiting position, the slag scraper is closed, and the oxygen lance is continuously raised to a position of 15-20 m above the upper limit position, the slag scraper is opened synchronously, and the furnace mouth cleaning is completed.

6. The multi-parameter co-ordinated controlled converter full sequence smelting process as claimed in claim 1, wherein, Smelting state determination: After the oxygen blowing is completed, the system determines based on the composition detection data and the preset threshold value, and processes in three cases: (1) The composition detection returns within 3 minutes and is determined to be qualified, and the tapping is performed; (2) The composition detection returns within 3 minutes and is determined to be unqualified, and the composition is adjusted and then determined again; (3) The composition data is not returned within 3 minutes, and it is determined to be qualified, and the tapping is performed; if the composition returned after the tapping is unqualified, the process is interrupted.

7. The multi-parameter co-ordinated controlled converter full sequence smelting process as claimed in claim 1, wherein, Tapping: (1) After the determination is qualified, the tapping pump is started, and the converter starts to swing; (2) When the converter swings to-15°, the slide is closed to prevent the molten steel from flowing out too early; when the converter swings to a preset tapping position of 30°-45°, the slide is opened, and the tapping is started; (3) After the molten steel is discharged, the converter swings to-60° again, the slide is opened to discharge the residual steel slag, then swings back to-15° and stops for 5 seconds to ensure that the slag is completely discharged, and finally the tapping pump is closed when the converter returns to zero position, and the automatic deoxidization and alloying are completed synchronously.

8. The multi-parameter co-ordinated controlled converter full sequence smelting process as claimed in claim 1, wherein, After the tapping is completed, the converter is raised to zero position and waits for more than 4 seconds, and the slagging is started: (1) The converter is swung to more than 100° and paused; then it is adjusted at an angle of 1° every time with an interval of 3 seconds; (2) After the slagging angle reaches more than 105° and stays for 5 seconds, the converter is automatically raised to return to zero position, and the slagging is completed.

9. The multi-parameter co-ordinated controlled converter full sequence smelting process as claimed in claim 1, wherein, Splashing: After the converter returns to zero position and waits for 4 seconds, the nitrogen pressure is 1.0-1.5 MPa, the lance position is 1.5-2.0 m, and the time is 5-10 minutes, and after the splashing is completed, the lance is raised and the nitrogen is turned off.

10. The multi-parameter co-ordinated controlled converter full sequence smelting process as claimed in claim 1, wherein, At the end of the heat, the lance is raised above the waiting position and the heat is ended.