A smelting method and control system for a metallurgical in-line cluster oxygen lance structure

Abstract

The present application provides a kind of metallurgical embedded cluster oxygen lance structure smelting method and control system, it is related to the technical field of arc furnace metallurgical oxygen lance structure and method regulation;The smelting method and control system include smelting control generation mode, standby heat preservation mode, auxiliary heating mode and oxygen supply operation mode;The smelting method and control system are corresponding to form different smelting methods and control modes of embedded cluster oxygen lance in logic judgment unit for different embedded cluster oxygen lance structure parameters and typical smelting stage characteristics of arc furnace, measure molten pool temperature value and molten pool height change value using temperature detection element and distance detection element built in the tail of embedded nozzle, continuously control the working position of embedded nozzle and the gas supply mode of embedded cluster oxygen lance based on the digital signal of molten pool temperature value and molten pool height change value through logic judgment unit.The present application is simple and easy to operate, low in cost, short in process, high in efficiency, conducive to industrial mass production and popularization.

Description

Technical Field

[0001] This invention relates to the technical field of oxygen lance structure and method control in electric arc furnace metallurgy, and in particular to a smelting method and control system for an embedded cluster oxygen lance structure for metallurgy. Background Technology

[0002] Cluster oxygen lance technology is an oxygen supply, heating, and heat preservation method developed for different smelting stages of electric arc furnaces, and it is now widely used in electric arc furnace smelting processes both domestically and internationally. In the molten pool smelting stage, this technology mainly utilizes the accompanying combustion medium surrounding the main oxygen supersonic jet to form a protective combustion flow under the high-temperature environment within the electric arc furnace, thereby improving the impact and stirring effect of the main oxygen jet on the molten pool and the oxygen delivery capacity. In the scrap melting stage, this technology adjusts the flow rates of epoxy and combustion medium to form a rapid combustion airflow, transferring the combustion heat to the low-temperature "molten steel-scrap steel" mixed state of the molten pool to accelerate scrap melting and pool temperature rise. In the tapping stage, this technology can further optimize the flow rates of epoxy and combustion medium to heat the surface of the molten pool in a small area, achieving the purpose of maintaining the temperature at the top of the molten pool.

[0003] Therefore, cluster oxygen lance technology can efficiently switch between oxygen supply mode, heating mode, and heat preservation mode according to different smelting stages of electric arc furnace. However, during the switching between different modes, the oxygen supply flow rate of the main oxygen Laval nozzle varies significantly within the range of 100% to 5% of its jet flow rate. Under low flow oxygen supply conditions, the main oxygen Laval nozzle is prone to backfire and slag suction problems, which leads to a reduction in the service life and performance of the cluster oxygen lance, thus inhibiting the smelting and economic indicators of electric arc furnace steelmaking.

[0004] Currently, the only way to ensure the smelting efficiency of electric arc furnace steelmaking is to periodically replace the cluster oxygen lance body by judging the flow and pressure curve changes during the operation of the main oxygen Laval nozzle. This method relies solely on subjective judgment based on on-site production experience to determine whether the cluster oxygen lance is working properly, and it cannot fundamentally solve the problems of backfire and slag suction inside the Laval nozzle caused by excessive main oxygen flow rate adjustment. Therefore, the existing cluster oxygen lance technology is insufficient to meet the high-efficiency, stable, and safe production requirements of electric arc furnaces at different smelting stages, increasing the operation and maintenance costs of the cluster oxygen lance system.

[0005] The rapid development of precision machining technology and intelligent control methods has made it feasible to upgrade the internal blowing structure of the cluster oxygen lance and achieve precise dynamic control.

[0006] For example, Chinese patent CN115600378A discloses an oxygen lance control method, system, electronic device, and storage medium. This oxygen lance control method includes acquiring historical smelting images of the converter furnace opening to construct training and testing sets; obtaining a trained state prediction model through the training and testing sets; determining initial control parameters for the oxygen lance based on historical steelmaking data of the converter and controlling the oxygen lance; acquiring furnace opening smelting images in real time; predicting the smelting conditions of the converter and correcting the initial control parameters; and adjusting the oxygen lance according to the corrected control parameters. Clearly, this method is based on historical data and targets converter oxygen lances, not electric arc furnace oxygen lances. The initial control parameters obtained from the prediction model are not suitable for electric arc furnace oxygen lances. In particular, the control mechanism of converter oxygen lances differs from that of electric arc furnace oxygen lances, and the resulting converter smelting conditions do not reflect reality. Furthermore, the furnace opening smelting images only reflect a portion of the converter smelting conditions, which may be affected by lighting and not accurately reflect the actual situation. The true smelting conditions of other parts of the converter are difficult to reflect, resulting in significant errors in oxygen lance control.

[0007] Chinese patent CN105969937A discloses a method for clustered oxygen supply in electric arc furnace steelmaking using variable calorific value fuel gas. The oxygen supply control system selects the oxygen lance working mode according to the actual needs of different smelting stages: burner mode A, burner mode B, burner mode C, dephosphorization mode, decarburization mode A, decarburization mode B, and protection mode. Obviously, the focus is on the selection of values ​​for fuel gas calorific value, fuel gas flow rate, main oxygen flow rate, and the distance between the combustion position and the oxygen lance outlet. However, the oxygen lance lifespan is still relatively short. The control mechanism of various modes is based on the principles of material balance and energy balance, and the division of smelting stages by real-time data such as flue gas composition and temperature, and the calculation of the duration of each working mode. Obtaining the flue gas composition in real-time data is difficult and the accuracy is low, and the calculation results are not precise in controlling the main oxygen flow rate.

[0008] This invention proposes a smelting method and control system with an embedded cluster oxygen lance structure for metallurgy, in order to improve oxygen supply efficiency, increase heating efficiency, enhance smelting rhythm and safety, and comprehensively improve the technical indicators and economic benefits of electric arc furnace steelmaking process. Summary of the Invention

[0009] To address the technical problems in existing electric furnace melting techniques, such as slow scrap melting speed, low oxygen utilization efficiency, and insufficient molten pool stirring, this invention proposes a metallurgical smelting method and control system with an embedded cluster oxygen lance structure. The technical solution is as follows:

[0010] A smelting method and control system for a metallurgical embedded cluster oxygen lance structure, the smelting method and control system including a smelting control generation mode, a standby heat preservation mode, an auxiliary heating mode and an oxygen supply operation mode.

[0011] The smelting method and control system, based on different embedded cluster oxygen lance structural parameters and typical smelting stage characteristics of electric arc furnaces, forms different smelting methods and control modes for embedded cluster oxygen lances in the logic judgment unit. It uses temperature detection elements and distance detection elements built into the tail of the embedded nozzle to measure the molten pool temperature and molten pool height change values. Based on the digital signals of molten pool temperature and molten pool height change values, the logic judgment unit continuously controls the working position of the embedded nozzle and the gas supply mode of the embedded cluster oxygen lance.

[0012] Optionally, the core equipment used in the control system includes an electric arc furnace central control system, an embedded cluster oxygen lance, an embedded nozzle, a temperature probe, a distance probe, a logic judgment unit, and an operation and display unit.

[0013] Optionally, the embedded cluster oxygen lance is equipped with an embedded nozzle, and the temperature probe and distance probe are located at the tail of the embedded nozzle. The temperature probe and distance probe are connected to the operation and display unit, and the operation and display unit is connected to the logic judgment unit. The electric arc furnace control system is connected to the electric arc furnace, the operation and display unit, and the logic judgment unit respectively.

[0014] Optionally, the embedded cluster oxygen lance includes an embedded cluster oxygen lance Laval nozzle, an embedded nozzle, an embedded cluster oxygen lance Laval nozzle throat, a main oxygen passage, an embedded nozzle gas passage, an annular oxygen passage, and a natural gas passage; wherein: the embedded cluster oxygen lance Laval nozzle is the main structure, the embedded cluster oxygen lance Laval nozzle throat is located at the throat of the embedded cluster oxygen lance Laval nozzle, the embedded nozzle gas passage and the annular main oxygen passage are both connected to the embedded cluster oxygen lance Laval nozzle, the embedded nozzle gas passage is surrounded by the annular main oxygen passage, the annular main oxygen passage is surrounded by the annular natural gas passage, and the annular natural gas passage is surrounded by the annular oxygen passage.

[0015] Optionally, the smelting control generation mode includes the following steps:

[0016] Step 1: After completing the overall assembly of the embedded cluster oxygen gun, adjust the embedded nozzle outlet to the position with the shortest distance between the temperature measuring probe and the distance measuring probe through the operation and display unit.

[0017] Step 2: Input the throat length signal of the embedded cluster oxygen gun Laval nozzle to the logic judgment unit through the operation and display unit;

[0018] Step 3: After receiving the throat length signal of the embedded cluster oxygen lance Laval nozzle, the logic judgment unit completes the storage of the throat length signal of the embedded cluster oxygen lance Laval nozzle and sends the preset debugging flow control signal to the electric arc furnace main control system.

[0019] Step 4: After receiving the commissioning flow control signal, the electric arc furnace main control system will adjust the gas flow and gas type of the main oxygen circuit within the commissioning flow control time.

[0020] Step 5: After the flow control debugging time is completed, the electric arc furnace main control system will send a flow control debugging setting completion signal to the operation and display unit;

[0021] Step Six: After receiving the commissioning flow control setting completion signal, the operation and display unit transmits the internal positioning signal to the electric arc furnace main control system;

[0022] Step 7: After receiving the internal positioning signal, the electric arc furnace main control system gradually moves the outlet position of the embedded nozzle closer to the inlet of the Laval nozzle throat of the embedded cluster oxygen lance, and continuously sends the gas flow and gas pressure signals of the main oxygen circuit to the logic judgment unit.

[0023] Step 8: The logic judgment unit determines the distance between the outlet of the embedded nozzle and the inlet of the throat of the embedded cluster oxygen gun Laval nozzle based on the characteristics of gas flow and gas pressure changes in the main oxygen circuit, and stores it in the logic judgment unit.

[0024] Step 9: Based on the length of the Laval nozzle throat of the embedded cluster oxygen lance, the distance between the outlet of the embedded nozzle and the inlet of the Laval nozzle throat of the embedded cluster oxygen lance, and the characteristics of typical smelting stages of electric arc furnace stored in the logic judgment unit, the logic judgment unit generates the smelting method and control mode of the embedded cluster oxygen lance.

[0025] Step 10: The logic judgment unit transmits the generated smelting method and control mode of the embedded cluster oxygen lance to the operation and display unit;

[0026] Step 11: After receiving the smelting method and control mode of the embedded cluster oxygen lance, the operation and display unit completes the loading of the smelting method and control mode of the embedded cluster oxygen lance.

[0027] Optionally, the standby heat preservation mode includes the following steps:

[0028] Step 1: The electric arc furnace control system transmits the end-of-cycle smelting signal to the operation and display unit;

[0029] Step 2: After receiving the smelting endpoint signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and sends the standby gas source control signal to the electric arc furnace main control system.

[0030] Step 3: After receiving the standby gas source control signal, the electric arc furnace main control system adjusts the gas flow and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the standby gas source control set time.

[0031] Step 4: After the standby gas source control setting time ends, the electric arc furnace main control system will send the standby gas source control setting completion signal to the operation and display unit;

[0032] Step 5: After receiving the standby gas source control setting completion signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and sends the standby position control signal to the electric arc furnace main control system.

[0033] Step 6: After receiving the standby position control signal, the electric arc furnace main control system moves the embedded nozzle outlet to the throat outlet of the embedded bundled oxygen lance Laval nozzle within the standby position set time.

[0034] Step 7: After the standby position setting time is completed, the electric arc furnace main control system will send a standby position setting completion signal to the operation and display unit.

[0035] Optionally, the auxiliary heating mode includes the following steps:

[0036] Step 1: When the electric arc furnace starts loading the scrap steel required for this smelting, the electric arc furnace control system sends the scrap steel melting start signal to the operation and display unit;

[0037] Step 2: After receiving the scrap steel melting start signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and transmits the heating gas source control signal to the electric arc furnace main control system.

[0038] Step 3: After receiving the heating gas source control signal, the electric arc furnace main control system adjusts the gas flow rate and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the heating gas source control set time.

[0039] Step 4: After the heating gas source control setting time is completed, the electric arc furnace main control system will send a signal indicating that the heating gas source control setting is complete to the operation and display unit;

[0040] Step 5: After receiving the signal indicating that the heating gas source control setting is complete, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and reads the critical value of the molten pool temperature and the critical value of the molten pool height change.

[0041] Step Six: After completing the reading of the critical values ​​for molten pool temperature and molten pool height change, the operation and display unit will start sending measurement signals to the electric arc furnace main control system;

[0042] Step 7: After receiving the start measurement signal, the electric arc furnace main control system activates the temperature probe and the distance probe;

[0043] Step 8: The temperature probe and distance probe continuously detect the molten pool temperature and molten pool height change values, and continuously send the molten pool temperature measurement value and molten pool height change measurement value to the operation and display unit;

[0044] Step 9: After receiving the measured values ​​of the molten pool temperature and the molten pool height change, the operation and display unit compares them with the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change.

[0045] Step 10: If the measured value of the molten pool temperature does not reach the critical value of the molten pool temperature, or the measured value of the change in molten pool height does not reach the critical value of the change in molten pool height, then return to Step 9 of the auxiliary heating mode; if the measured value of the molten pool temperature reaches the critical value of the molten pool temperature, and the measured value of the change in molten pool height reaches the critical value of the change in molten pool height, then the operation and display unit sends the scrap steel melting end signal to the electric arc furnace main control system.

[0046] Optionally, the oxygen supply operation mode includes the following steps:

[0047] Step 1: After receiving the scrap melting completion signal, the electric arc furnace main control system sends the steel smelting start signal to the operation and display unit;

[0048] Step 2: After receiving the steel smelting start signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and transmits the oxygen supply position control signal and depth measurement shutdown signal to the electric arc furnace main control system.

[0049] Step 3: After receiving the oxygen supply position control signal and the depth measurement shutdown signal, the electric arc furnace main control system adjusts the embedded nozzle outlet to the position with the shortest distance between the temperature probe and the distance probe within the oxygen supply position set time, and simultaneously shuts off the distance probe.

[0050] Step 4: After the oxygen supply position setting time is completed, the electric arc furnace main control system will send the oxygen supply position setting completion signal to the operation and display unit;

[0051] Step 5: After receiving the oxygen supply position setting completion signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance, and transmits the oxygen supply source control signal to the electric arc furnace main control system.

[0052] Step 6: After receiving the oxygen supply source control signal, the electric arc furnace main control system adjusts the gas flow rate and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the set time of the oxygen supply source control.

[0053] Step 7: After the oxygen supply source control setting time is completed, the electric arc furnace main control system will send the oxygen supply source control setting completion signal to the operation and display unit;

[0054] Step 8: After receiving the oxygen supply source control setting completion signal, the operation and display unit runs the smelting method and control mode of the embedded cluster oxygen lance and reads the final value of the molten pool temperature.

[0055] Step 9: The operation and display unit will receive the measured value of the molten pool temperature and compare it with the endpoint value of the molten pool temperature;

[0056] Step 10: If the measured value of the molten pool temperature does not reach the endpoint value of the molten pool temperature, return to step 9 of the oxygen supply operation mode; if the measured value of the molten pool temperature reaches the endpoint value of the molten pool temperature, the operation and display unit will send the steel smelting end signal to the electric arc furnace main control system.

[0057] Step 11: After receiving the signal that the molten steel smelting has ended, the electric arc furnace main control system returns to the standby heat preservation mode.

[0058] Optionally, the embedded nozzle is installed inside the main oxygen circuit, and the air supply flow rate of the embedded nozzle ranges from 100 to 1500 Nm³. 3 / h, the expansion angle formed by the inner and outer diameters of the embedded nozzle differs from the expansion angle of the embedded cluster oxygen lance Laval nozzle by -5° to +5°, the minimum distance between the outer diameter of the embedded nozzle and the inner diameter of the main oxygen circuit is 0.01-0.30mm, and the gas supplied by the embedded nozzle is oxygen, nitrogen, argon, carbon dioxide or a mixture of the above four gases.

[0059] Optionally, the oxygen utilization rate of the smelting method and control system is increased by more than 3.0%, the fuel consumption is reduced by more than 2.5%, the melting time of the electric arc furnace is shortened by more than 1.5 minutes, and the continuous working life of the embedded cluster oxygen lance is more than 450 heats.

[0060] Optionally, the present invention provides the application of the above-mentioned metallurgical embedded cluster oxygen lance structure smelting method and control system in the field of electric arc furnace metallurgy.

[0061] The technical principle of this invention is as follows: Based on the characteristics of oxygen and fuel gas demand at different smelting stages of an electric furnace, an embedded nozzle with a small-sized throat structure and a Laval nozzle with a large-sized throat structure are designed. Based on the dynamic molten pool temperature and height values ​​from temperature and distance measuring probes installed at the tail of the embedded cluster oxygen lance, a logic judgment unit continuously controls the working position of the embedded nozzle and the gas supply mode of the embedded cluster oxygen lance. When high-flow-rate oxygen supply is required, the embedded nozzle and the Laval nozzle are separated, forming a jetting structure with the Laval nozzle as the core, constituting a "high-flow-constant Mach number" oxygen supply system to achieve high oxygen flow rate and high flow rate. When low-flow-rate oxygen supply is required, the embedded nozzle and the Laval nozzle are tightly coupled, forming a combined structure with the embedded nozzle and the Laval nozzle as the core, constituting a "low-flow-constant Mach number" oxygen supply system to achieve a low-flow-rate oxygen supply mode.

[0062] The above technical solution has at least the following advantages compared with the existing technology:

[0063] The above-mentioned solution proposes a smelting method and control system with an embedded cluster oxygen lance structure for metallurgy, which can solve the technical problems in the prior art such as slow scrap melting speed, low oxygen utilization efficiency and insufficient stirring effect of the molten pool during the electric furnace melting period.

[0064] This invention provides a smelting method and control mode that automatically generates an embedded cluster oxygen lance based on the characteristics of different electric arc furnace smelting stages (such as oxygen supply flow range, molten pool temperature and molten pool depth), thereby improving the gas supply and heating efficiency of the electric furnace at different smelting stages, enhancing the overall smelting rhythm of the electric furnace, and increasing the service life of the embedded cluster oxygen lance.

[0065] This invention uses measurement signals of molten pool temperature and molten pool height changes to continuously control the working position of the embedded nozzle and the gas supply mode of the embedded cluster oxygen lance, thereby achieving online adjustment of the Laval nozzle throat structure and improving the oxygen jet penetration efficiency.

[0066] This invention controls the production mode during smelting to avoid human interference, intelligently determines the gas supply mode required for different smelting stages of the electric furnace, and increases the utilization efficiency of oxygen and fuel gas.

[0067] This invention reduces the total consumption of oxygen and fuel gas through a standby heat preservation mode, stabilizes the overall temperature of the molten pool, and prevents slag from being drawn into the interior of the embedded cluster oxygen lance.

[0068] This invention achieves the goal of shortening the melting time of scrap steel and improving the heating efficiency of the molten pool by using an auxiliary heating mode under a low-flow oxygen supply mode.

[0069] This invention meets the oxygen supply requirements during the decarburization period of the electric furnace through an oxygen supply operation mode, enhances the stirring effect of the molten pool, and increases the oxygen utilization efficiency.

[0070] The smelting method and control system of this invention improves oxygen utilization by more than 3.0%, reduces fuel consumption by more than 2.5%, shortens the melting time of electric arc furnace by more than 1.5 minutes, and has a continuous working life of more than 450 heats for the embedded cluster oxygen lance.

[0071] In summary, compared with other traditional methods, the method of this invention achieves efficient, stable, and safe production of electric arc furnaces at different smelting stages through smelting control production mode, standby heat preservation mode, auxiliary heating mode, and oxygen supply operation mode. It meets the design requirements of embedded cluster oxygen lances in terms of improving oxygen supply efficiency, increasing heating efficiency, and enhancing smelting rhythm and safety. It also comprehensively improves the technical indicators and economic benefits of electric arc furnace steelmaking processes, ensuring its broad application space in the field of electric arc furnace metallurgy. This method is simple to operate, environmentally friendly, low in cost, short in process, and highly efficient, which is conducive to large-scale industrial production and promotion. Attached Figure Description

[0072] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0073] Figure 1 This is a schematic diagram of the smelting method and control system of the metallurgical embedded cluster oxygen lance structure of the present invention; wherein, mark 1 is electric arc furnace, mark 2 is embedded cluster oxygen lance, mark 3 is temperature probe, mark 4 is distance probe, mark 5 is operation and display unit, mark 6 is logic judgment unit, and mark 7 is electric arc furnace main control system.

[0074] Figure 2 This is a schematic diagram of the nozzle head structure of the embedded cluster oxygen lance in the smelting method and control system of the metallurgical embedded cluster oxygen lance structure of the present invention; wherein, mark 2-1 is the embedded nozzle, mark 2-2 is the throat of the embedded cluster oxygen lance Laval nozzle, mark 2-3 is the main oxygen path, mark 2-4 is the gas path of the embedded nozzle, mark 2-5 is the annular oxygen path, and mark 2-6 is the natural gas path. Detailed Implementation

[0075] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0076] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0077] In the embodiments of the present invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, their intended meanings are consistent.

[0078] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0079] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0080] Example 1

[0081] This embodiment is applied in the smelting process of a 120-ton electric arc furnace, with the embedded nozzle supplying gas flow rate ranging from 100-800 Nm³. 3 / h, the expansion angle formed by the inner and outer diameters of the embedded nozzle differs from that of the embedded cluster oxygen lance Laval nozzle by -3°. The minimum distance between the outer diameter of the embedded nozzle and the inner diameter of the main oxygen circuit is 0.02mm. The embedded nozzle supplies either pure oxygen or pure nitrogen. For specific process operations, please refer to... Figure 1 and Figure 2 This includes the following steps:

[0082] Step 1: The embedded cluster oxygen lance 2 is ready for overall assembly. The smelting control generation mode is selected, and the specific control method is as follows:

[0083] Step 1.1) After completing the overall assembly of the embedded cluster oxygen gun 2, adjust the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 through the operation and display unit 5.

[0084] Step 1.2) The signal with a length of 5.0 mm from the throat 2-2 of the embedded cluster oxygen gun Laval nozzle is input to the logic judgment unit 6 through the operation and display unit 5;

[0085] Step 1.3) After receiving the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 5.0mm, the logic judgment unit 6 completes the storage of the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 5.0mm, and sends the preset debugging flow control signal to the electric arc furnace main control system 7.

[0086] Step 1.4) After receiving the commissioning flow control signal, the electric arc furnace main control system 7 completes the adjustment of the main oxygen circuit gas flow rate to 300 Nm³ within the commissioning flow control time of 3.0 s. 3 / h and adjustment for nitrogen gas type;

[0087] Step 1.5) After the flow control debugging time reaches 3.0s, the electric arc furnace main control system 7 will send the flow control debugging setting completion signal to the operation and display unit 5;

[0088] Step 1.6) After receiving the commissioning flow control setting completion signal, the operation and display unit 5 transmits the internal positioning signal to the electric arc furnace main control system 7;

[0089] Step 1.7) After receiving the internal positioning signal, the electric arc furnace main control system 7 gradually moves the outlet position of the embedded nozzle 2-1 closer to the inlet of the throat 2-2 of the embedded bundled oxygen lance Laval nozzle, and continuously sends the gas flow and gas pressure signals of the main oxygen path 2-3 to the logic judgment unit 6.

[0090] Step 1.8) Logic judgment unit 6 reduces the gas flow rate of the main oxygen circuit 2-3 to 1 Nm³. 3 When the gas pressure in the main oxygen circuit 2-3 is increased to above 0.10MPa, the distance between the outlet of the embedded nozzle 2-1 and the inlet of the throat 2-2 of the embedded cluster oxygen gun Laval nozzle is determined to be 16.3mm, and stored in the logic judgment unit 6.

[0091] Step 1.9) Based on the stored information in the logic judgment unit 6, namely the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 5.0 mm, the distance from the outlet of the embedded nozzle 2-1 to the inlet of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 16.3 mm, and the typical smelting stage characteristics of the electric arc furnace 1, the logic judgment unit 6 generates the following settings for the standby heat preservation mode: standby gas source control setting time is 5.0 s, standby position setting time is 3.0 s, and the gas supply flow rates for the main oxygen path 2-3, embedded nozzle gas path 2-4, annular oxygen path 2-5, and natural gas path 2-6 are 0.2 Nm³. 3 / h, 100Nm 3 / h, 50Nm 3 / h and 100Nm 3 / h, the gas supply media for the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are nitrogen, oxygen, oxygen, and natural gas, respectively; in auxiliary heating mode, the auxiliary heating gas source control setting time is 6.0s, and the gas supply flow rates for the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are 0.2Nm³ / h. 3 / h, 500Nm 3 / h, 200Nm 3 / h and 350Nm 3 / h, the gas supply media for the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are oxygen, oxygen, oxygen, and natural gas, respectively. The critical value for molten pool temperature is set to 1400℃ and the critical value for molten pool height change is set to 110mm. In oxygen supply operation mode, the oxygen supply source control setting time is 6.0s, the oxygen supply position setting time is 3.0s, and the gas supply flow rates for the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are 2000Nm³. 3 / h, 800Nm 3 / h, 100Nm 3 / h and 100Nm 3 / h, the gas supply media of the embedded nozzle gas path 2-4, the annular oxygen path 2-5 and the natural gas path 2-6 are oxygen, oxygen, oxygen and natural gas respectively, and the final value of the molten pool temperature is set to 1610℃.

[0092] Step 1.10) The logic judgment unit 6 transmits the smelting method and control mode of the generated embedded cluster oxygen lance 2 to the operation and display unit 5;

[0093] Step 1.11) After receiving the smelting method and control mode of the embedded cluster oxygen lance 2, the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2.

[0094] Step 2: After the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2, and at the end of this smelting cycle of the electric arc furnace 1, the standby heat preservation mode is selected. The specific control method is as follows:

[0095] Step 2.1) The electric arc furnace main control system 7 transmits the end point signal of this smelting cycle to the operation and display unit 5;

[0096] Step 2.2) After receiving the smelting endpoint signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby gas source control signal to the electric arc furnace main control system 7.

[0097] Step 2.3) After receiving the standby gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 0.2 Nm³ within the standby gas source control set time of 5.0 s. 3 / h, 100Nm 3 / h, 50Nm 3 / h and 100Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the epoxy gas passage 2-5 and the natural gas passage 2-6 to nitrogen, oxygen, oxygen and natural gas respectively;

[0098] Step 2.4) After the standby gas source control setting time reaches 5.0s, the electric arc furnace main control system 7 sends the standby gas source control setting completion signal to the operation and display unit 5;

[0099] Step 2.5) After receiving the standby gas source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby position control signal to the electric arc furnace main control system 7.

[0100] Step 2.6) After receiving the standby position control signal, the electric arc furnace main control system 7 moves the outlet of the embedded nozzle 2-1 to the outlet of the throat of the embedded bundled oxygen lance Laval nozzle 2-2 within the standby position setting time of 3.0s.

[0101] Step 2.7) After the standby position setting time reaches 3.0s, the electric arc furnace main control system 7 sends the standby position setting completion signal to the operation and display unit 5.

[0102] Step 3: Before the scrap loading begins in electric arc furnace 1, select the auxiliary heating mode. The specific control method is as follows:

[0103] Step 3.1) When the electric arc furnace 1 starts loading the scrap steel required for this furnace smelting, the electric arc furnace control system 7 sends the scrap steel melting start signal to the operation and display unit 5;

[0104] Step 3.2) After receiving the scrap steel melting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the heating gas source control signal to the electric arc furnace main control system 7.

[0105] Step 3.3) After receiving the heating gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 0.2 Nm³ within the heating gas source control set time of 6.0 s. 3 / h, 500Nm 3 / h, 200Nm 3 / h and 350Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the annular oxygen passage 2-5 and the natural gas passage 2-6 to oxygen, oxygen, oxygen and natural gas respectively;

[0106] Step 3.4) After the heating gas source control setting time reaches 6.0s, the electric arc furnace main control system 7 sends the heating gas source control setting completion signal to the operation and display unit 5;

[0107] Step 3.5) After receiving the signal indicating that the heating gas source control setting is complete, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and reads the critical value as 1400℃ and the critical value for the change in molten pool height as 110mm.

[0108] Step 3.6) After completing the reading of the critical values ​​of molten pool temperature and molten pool height change, the operation and display unit 5 will send the start measurement signal to the electric arc furnace main control system 7;

[0109] Step 3.7) After receiving the start measurement signal, the electric arc furnace main control system 7 activates the temperature probe 3 and the distance probe 4;

[0110] Step 3.8) Temperature probe 3 and distance probe 4 continuously detect the molten pool temperature and molten pool height change, and continuously send the molten pool temperature measurement value and molten pool height change measurement value to operation and display unit 5;

[0111] Step 3.9) After receiving the measured values ​​of the molten pool temperature and the molten pool height change, the operation and display unit 5 compares them with the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change;

[0112] Step 3.10) If the measured value of the molten pool temperature does not reach the critical value of 1400℃, or the measured value of the change in molten pool height does not reach the critical value of 110mm, then return to step 3.9; if the measured value of the molten pool temperature reaches the critical value of 1400℃, and the measured value of the change in molten pool height reaches the critical value of 110mm, then the operation and display unit 5 sends the scrap steel melting end signal to the electric arc furnace main control system 7.

[0113] Step 4: After the scrap steel in electric arc furnace 1 has completely melted, select the oxygen supply operation mode. The specific control method is as follows:

[0114] Step 4-1) After receiving the scrap melting end signal, the electric arc furnace main control system 7 sends the steel smelting start signal to the operation and display unit 5;

[0115] Step 4-2) After receiving the steel smelting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and transmits the oxygen supply position control signal and depth measurement shutdown signal to the electric arc furnace main control system 7.

[0116] Step 4-3) After receiving the oxygen supply position control signal and the depth measurement shutdown signal, the electric arc furnace main control system 7 adjusts the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 within the oxygen supply position setting time of 3.0s, and simultaneously shuts down the distance measuring probe 4.

[0117] After the oxygen supply position setting time is completed in step 4-4), the electric arc furnace main control system 7 will send the oxygen supply position setting completion signal to the operation and display unit 5;

[0118] Steps 4-5) After receiving the oxygen supply position setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the oxygen supply source control signal to the electric arc furnace main control system 7.

[0119] Steps 4-6) After receiving the oxygen supply source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 2000 Nm³ within the oxygen supply source control set time of 6.0 s. 3 / h, 800Nm 3 / h, 100Nm 3 / h and 100Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the annular oxygen passage 2-5 and the natural gas passage 2-6 to oxygen, oxygen, oxygen and natural gas respectively;

[0120] Steps 4-7) After the oxygen supply source control setting time reaches 6.0s, the electric arc furnace main control system 7 will send the oxygen supply source control setting completion signal to the operation and display unit 5;

[0121] Steps 4-8) After receiving the oxygen supply source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and reads the final value of the molten pool temperature, 1610℃.

[0122] Steps 4-9) The operation and display unit 5 will receive the measured value of the molten pool temperature and compare it with the endpoint value of the molten pool temperature;

[0123] Step 4-10) If the measured value of the molten pool temperature does not reach the end value of the molten pool temperature, return to step 4-9; if the measured value of the molten pool temperature reaches the end value of the molten pool temperature, the operation and display unit 5 sends the steel smelting end signal to the electric arc furnace main control system 7.

[0124] Step 4-11) After receiving the steel smelting end signal, the electric arc furnace main control system 7 returns to step 2.1.

[0125] After adopting the control method of this embodiment, the oxygen utilization rate is increased by 3.5%, the fuel consumption is reduced by 2.6%, the melting time of the electric arc furnace is shortened by 1.9 minutes, and the continuous working life of the embedded cluster oxygen lance is 468 heats.

[0126] Example 2

[0127] This embodiment is applied in the smelting process of a 150-ton electric arc furnace, with the embedded nozzle supplying gas flow rate ranging from 200-1200 Nm³. 3 / h, the expansion angle formed by the inner and outer diameters of the embedded nozzle differs from the expansion angle of the embedded cluster oxygen lance Laval nozzle by +2°. The minimum distance between the outer diameter of the embedded nozzle and the inner diameter of the main oxygen circuit is 0.10mm. The embedded nozzle supplies pure oxygen. For specific process operations, please refer to... Figure 1 and Figure 2 This includes the following steps:

[0128] Step 1: The embedded cluster oxygen lance 2 is ready for overall assembly. The smelting control generation mode is selected, and the specific control method is as follows:

[0129] Step 1.1) After completing the overall assembly of the embedded cluster oxygen gun 2, adjust the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 through the operation and display unit 5.

[0130] Step 1.2) The signal with a length of 6.0 mm from the throat 2-2 of the embedded cluster oxygen gun Laval nozzle is input to the logic judgment unit 6 through the operation and display unit 5;

[0131] Step 1.3) After receiving the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 6.0mm, the logic judgment unit 6 completes the storage of the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 6.0mm, and sends the preset debugging flow control signal to the electric arc furnace main control system 7.

[0132] Step 1.4) After receiving the commissioning flow control signal, the electric arc furnace main control system 7 completes the setting of the main oxygen circuit gas flow rate to 500 Nm³ within the commissioning flow control time of 4.0 s. 3 / h and adjustment for oxygen as the gas type;

[0133] Step 1.5) After the flow control debugging time reaches 3.0s, the electric arc furnace main control system 7 will send the flow control debugging setting completion signal to the operation and display unit 5;

[0134] Step 1.6) After receiving the commissioning flow control setting completion signal, the operation and display unit 5 transmits the internal positioning signal to the electric arc furnace main control system 7;

[0135] Step 1.7) After receiving the internal positioning signal, the electric arc furnace main control system 7 gradually moves the outlet position of the embedded nozzle 2-1 closer to the inlet of the throat 2-2 of the embedded bundled oxygen lance Laval nozzle, and continuously sends the gas flow and gas pressure signals of the main oxygen path 2-3 to the logic judgment unit 6.

[0136] Step 1.8) Logic judgment unit 6 reduces the gas flow rate of main oxygen circuit 2-3 to 2 Nm³. 3 When the gas pressure in the main oxygen circuit 2-3 is increased to above 0.11MPa, the distance between the outlet of the embedded nozzle 2-1 and the inlet of the throat 2-2 of the embedded cluster oxygen gun Laval nozzle is determined to be 24.7mm, and stored in the logic judgment unit 6.

[0137] Step 1.9) Based on the stored information in the logic judgment unit 6, including the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 as 6.0 mm, the distance from the outlet of the embedded nozzle 2-1 to the inlet of the embedded cluster oxygen lance Laval nozzle throat 2-2 as 24.7 mm, and the typical smelting stage characteristics of the electric arc furnace 1, the logic judgment unit 6 generates the following settings for the standby heat preservation mode: standby gas source control setting time is 6.0 s, standby position setting time is 4.0 s, and the gas supply flow rates for the main oxygen path 2-3, embedded nozzle gas path 2-4, annular oxygen path 2-5, and natural gas path 2-6 are 0.5 Nm³. 3 / h, 200Nm 3 / h, 300Nm 3 / h and 400Nm 3 / h, the gas supply media for the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are oxygen, oxygen, oxygen, and natural gas, respectively; in auxiliary heating mode, the auxiliary heating gas source control setting time is 6.0s, and the gas supply flow rates for the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are 0.5Nm³ / h. 3 / h, 700Nm 3 / h, 300Nm 3 / h and 400Nm 3 / h, the gas supply media for the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are oxygen, oxygen, oxygen, and natural gas, respectively. The critical value for molten pool temperature is set to 1390℃ and the critical value for molten pool height change is set to 126mm. In oxygen supply operation mode, the oxygen supply source control setting time is 6.0s, the oxygen supply position setting time is 4.0s, and the gas supply flow rates for the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 are 2300Nm³. 3 / h, 1200Nm 3 / h, 150Nm 3 / h and 150Nm 3 / h, the gas supply media of the embedded nozzle gas path 2-4, the annular oxygen path 2-5 and the natural gas path 2-6 are oxygen, oxygen, oxygen and natural gas respectively, and the final value of the molten pool temperature is set to 1605℃.

[0138] Step 1.10) The logic judgment unit 6 transmits the smelting method and control mode of the generated embedded cluster oxygen lance 2 to the operation and display unit 5;

[0139] Step 1.11) After receiving the smelting method and control mode of the embedded cluster oxygen lance 2, the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2.

[0140] Step 2: After the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2, and at the end of this smelting cycle of the electric arc furnace 1, the standby heat preservation mode is selected. The specific control method is as follows:

[0141] Step 2.1) The electric arc furnace main control system 7 transmits the end point signal of this smelting cycle to the operation and display unit 5;

[0142] Step 2.2) After receiving the smelting endpoint signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby gas source control signal to the electric arc furnace main control system 7.

[0143] Step 2.3) After receiving the standby gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 0.5 Nm³ within the standby gas source control set time of 6.0 s. 3 / h, 200Nm 3 / h, 300Nm 3 / h and 400Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the annular oxygen passage 2-5 and the natural gas passage 2-6 to oxygen, oxygen, oxygen and natural gas respectively;

[0144] Step 2.4) After the standby gas source control setting time reaches 6.0s, the electric arc furnace main control system 7 sends the standby gas source control setting completion signal to the operation and display unit 5;

[0145] Step 2.5) After receiving the standby gas source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby position control signal to the electric arc furnace main control system 7.

[0146] Step 2.6) After receiving the standby position control signal, the electric arc furnace main control system 7 moves the outlet of the embedded nozzle 2-1 to the outlet of the throat of the embedded bundled oxygen lance Laval nozzle 2-2 within the standby position setting time of 4.0s.

[0147] Step 2.7) After the standby position setting time reaches 4.0s, the electric arc furnace main control system 7 sends the standby position setting completion signal to the operation and display unit 5.

[0148] Step 3: Before the scrap loading begins in electric arc furnace 1, select the auxiliary heating mode. The specific control method is as follows:

[0149] Step 3.1) When the electric arc furnace 1 starts loading the scrap steel required for this furnace smelting, the electric arc furnace control system 7 sends the scrap steel melting start signal to the operation and display unit 5;

[0150] Step 3.2) After receiving the scrap steel melting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the heating gas source control signal to the electric arc furnace main control system 7.

[0151] Step 3.3) After receiving the heating gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 0.2 Nm³ within the heating gas source control set time of 6.0 s. 3 / h, 500Nm 3 / h, 200Nm 3 / h and 350Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the annular oxygen passage 2-5 and the natural gas passage 2-6 to oxygen, oxygen, oxygen and natural gas respectively;

[0152] Step 3.4) After the heating gas source control setting time reaches 6.0s, the electric arc furnace main control system 7 sends the heating gas source control setting completion signal to the operation and display unit 5;

[0153] Step 3.5) After receiving the signal indicating that the heating gas source control setting is complete, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and reads the critical value of the molten pool temperature as 1390℃ and the critical value of the molten pool height change as 126mm.

[0154] Step 3.6) After completing the reading of the critical values ​​of molten pool temperature and molten pool height change, the operation and display unit 5 will send the start measurement signal to the electric arc furnace main control system 7;

[0155] Step 3.7) After receiving the start measurement signal, the electric arc furnace main control system 7 activates the temperature probe 3 and the distance probe 4;

[0156] Step 3.8) Temperature probe 3 and distance probe 4 continuously detect the molten pool temperature and molten pool height change, and continuously send the molten pool temperature measurement value and molten pool height change measurement value to operation and display unit 5;

[0157] Step 3.9) After receiving the measured values ​​of the molten pool temperature and the molten pool height change, the operation and display unit 5 compares them with the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change;

[0158] Step 3.10) If the measured value of the molten pool temperature does not reach the critical value of 1390℃, or the measured value of the change in molten pool height does not reach the critical value of 126mm, then return to step 3.9; if the measured value of the molten pool temperature reaches the critical value of 1390℃, and the measured value of the change in molten pool height reaches the critical value of 126mm, then the operation and display unit 5 sends the scrap steel melting end signal to the electric arc furnace main control system 7.

[0159] Step 4: After the scrap steel in electric arc furnace 1 has completely melted, select the oxygen supply operation mode. The specific control method is as follows:

[0160] Step 4-1) After receiving the scrap melting end signal, the electric arc furnace main control system 7 sends the steel smelting start signal to the operation and display unit 5;

[0161] Step 4-2) After receiving the steel smelting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and transmits the oxygen supply position control signal and depth measurement shutdown signal to the electric arc furnace main control system 7.

[0162] Step 4-3) After receiving the oxygen supply position control signal and the depth measurement shutdown signal, the electric arc furnace main control system 7 adjusts the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 within the oxygen supply position setting time of 4.0s, and simultaneously shuts down the distance measuring probe 4.

[0163] Step 4-4) When the oxygen supply position setting time reaches 4.0s, the electric arc furnace main control system 7 sends the oxygen supply position setting completion signal to the operation and display unit 5;

[0164] Steps 4-5) After receiving the oxygen supply position setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the oxygen supply source control signal to the electric arc furnace main control system 7.

[0165] Steps 4-6) After receiving the oxygen supply source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen path 2-3, the embedded nozzle gas path 2-4, the annular oxygen path 2-5, and the natural gas path 2-6 to 2300 Nm³ within the oxygen supply source control set time of 6.0 s. 3 / h, 1200Nm 3 / h, 150Nm 3 / h and 150Nm 3 / h, and adjust the gas supply medium of the embedded nozzle gas passage 2-4, the annular oxygen passage 2-5 and the natural gas passage 2-6 to oxygen, oxygen, oxygen and natural gas respectively;

[0166] Steps 4-7) After the oxygen supply source control setting time reaches 6.0s, the electric arc furnace main control system 7 will send the oxygen supply source control setting completion signal to the operation and display unit 5;

[0167] Steps 4-8) After receiving the oxygen supply source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and reads the final value of the molten pool temperature, 1605℃.

[0168] Steps 4-9) The operation and display unit 5 will receive the measured value of the molten pool temperature and compare it with the endpoint value of the molten pool temperature;

[0169] Step 4-10) If the measured value of the molten pool temperature does not reach the end value of the molten pool temperature, return to step 4-9; if the measured value of the molten pool temperature reaches the end value of the molten pool temperature, the operation and display unit 5 sends the steel smelting end signal to the electric arc furnace main control system 7.

[0170] Step 4-11) After receiving the steel smelting end signal, the electric arc furnace main control system 7 returns to step 2.1.

[0171] After adopting the control method of the present invention, the oxygen utilization rate is increased by 3.7%, the fuel consumption is reduced by 2.4%, the melting time of the electric arc furnace is shortened by 2.1 min, and the continuous working life of the embedded cluster oxygen lance is 481 furnace cycles.

[0172] Example 3

[0173] This embodiment is applied in the smelting process of a 200-ton electric arc furnace. The gas supply flow rate of the embedded nozzle ranges from 250 to 1500 Nm³ / h. The expansion angle formed by the inner and outer diameters of the embedded nozzle differs from the expansion angle of the embedded cluster oxygen lance Laval nozzle by +2.5°. The minimum distance between the outer diameter of the embedded nozzle and the inner diameter of the main oxygen path is 0.12 mm. The gas supplied by the embedded nozzle is pure oxygen. For specific process operations, please refer to... Figure 1 and Figure 2 This includes the following steps:

[0174] Step 1: The embedded cluster oxygen lance 2 is ready for overall assembly. The smelting control generation mode is selected, and the specific control method is as follows:

[0175] Step 1.1) After completing the overall assembly of the embedded cluster oxygen gun 2, adjust the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 through the operation and display unit 5.

[0176] Step 1.2) The signal with a length of 10.0 mm for the Laval nozzle throat 2-2 of the embedded cluster oxygen gun is input to the logic judgment unit 6 through the operation and display unit 5;

[0177] Step 1.3) After receiving the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 10.0mm, the logic judgment unit 6 completes the storage of the signal that the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 10.0mm, and sends the preset debugging flow control signal to the electric arc furnace main control system 7.

[0178] Step 1.4) After receiving the commissioning flow control signal, the electric arc furnace main control system 7 completes the adjustment of the main oxygen circuit gas flow rate to 700 Nm3 / h and the gas type to oxygen within the commissioning flow control time of 5.0 s;

[0179] Step 1.5) After the flow control debugging time reaches 5.0s, the electric arc furnace main control system 7 will send the flow control debugging setting completion signal to the operation and display unit 5;

[0180] Step 1.6) After receiving the commissioning flow control setting completion signal, the operation and display unit 5 transmits the internal positioning signal to the electric arc furnace main control system 7;

[0181] Step 1.7) After receiving the internal positioning signal, the electric arc furnace main control system 7 gradually moves the outlet position of the embedded nozzle 2-1 closer to the inlet of the throat 2-2 of the embedded bundled oxygen lance Laval nozzle, and continuously sends the gas flow and gas pressure signals of the main oxygen path 2-3 to the logic judgment unit 6.

[0182] Step 1.8) After the gas flow rate of the main oxygen line 2-3 decreases to below 3 Nm3 / h and the gas pressure of the main oxygen line 2-3 increases to above 0.12 MPa, the logic judgment unit 6 determines that the distance between the outlet of the embedded nozzle 2-1 and the inlet of the throat 2-2 of the embedded cluster oxygen gun Laval nozzle is 24.7 mm, and stores it in the logic judgment unit 6.

[0183] Step 1.9) Based on the stored information in the logic judgment unit 6, namely the length of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 10.0 mm, the distance from the outlet of the embedded nozzle 2-1 to the inlet of the embedded cluster oxygen lance Laval nozzle throat 2-2 is 32.3 mm, and the typical smelting stage characteristics of the electric arc furnace 1, the logic judgment unit 6 generates the following settings: when taking the standby heat preservation mode, the standby gas source control setting time is 7.0 s, the standby position setting time is 5.0 s, and the main oxygen path 2-3 and the embedded nozzle gas path... The gas supply flow rates for 2-4, the epoxy oxygen circuit 2-5, and the natural gas circuit 2-6 are 0.5 Nm³ / h, 300 Nm³ / h, 350 Nm³ / h, and 450 Nm³ / h, respectively. The gas media supplied by the embedded nozzle gas circuit 2-4, the epoxy oxygen circuit 2-5, and the natural gas circuit 2-6 are oxygen, oxygen, oxygen, and natural gas, respectively. In auxiliary heating mode, the auxiliary heating gas source control setting time is 7.0 s. The main oxygen circuit 2-3, the embedded nozzle gas circuit 2-4, the epoxy oxygen circuit 2-5, and the natural gas circuit 2-6... The gas supply flow rates for gas lines 2-6 are 0.5 Nm³ / h, 800 Nm³ / h, 400 Nm³ / h, and 500 Nm³ / h, respectively. The gas supply media for embedded nozzle gas lines 2-4, annular gas lines 2-5, and natural gas lines 2-6 are oxygen, oxygen, oxygen, and natural gas, respectively. The critical value for molten pool temperature is set to 1395℃ and the critical value for molten pool height change is set to 163 mm. In oxygen supply operation mode, the oxygen supply source control setting time is 7.0 s and the oxygen supply position setting time is 5 s. The smelting method and control mode of the embedded cluster oxygen lance 2, with the main oxygen circuit 2-3, the embedded nozzle gas circuit 2-4, the annular oxygen circuit 2-5 and the natural gas circuit 2-6 supplying flow rates of 2500 Nm3 / h, 1300 Nm3 / h, 200 Nm3 / h and 200 Nm3 / h respectively, and the gas supply media of the embedded nozzle gas circuit 2-4, the annular oxygen circuit 2-5 and the natural gas circuit 2-6 being oxygen, oxygen, oxygen and natural gas respectively, and the final value of the molten pool temperature set at 1613℃;

[0184] Step 1.10) The logic judgment unit 6 transmits the smelting method and control mode of the generated embedded cluster oxygen lance 2 to the operation and display unit 5;

[0185] Step 1.11) After receiving the smelting method and control mode of the embedded cluster oxygen lance 2, the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2.

[0186] Step 2: After the operation and display unit 5 completes the loading of the smelting method and control mode of the embedded cluster oxygen lance 2, and at the end of this smelting cycle of the electric arc furnace 1, the standby heat preservation mode is selected. The specific control method is as follows:

[0187] Step 2.1) The electric arc furnace main control system 7 transmits the end point signal of this smelting cycle to the operation and display unit 5;

[0188] Step 2.2) After receiving the smelting endpoint signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby gas source control signal to the electric arc furnace main control system 7.

[0189] Step 2.3) After receiving the standby gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen line 2-3, the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to 0.5 Nm3 / h, 300 Nm3 / h, 350 Nm3 / h, and 450 Nm3 / h respectively within the standby gas source control set time of 7.0 s. It also adjusts the gas supply medium of the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to oxygen, oxygen, oxygen, and natural gas respectively.

[0190] Step 2.4) After the standby gas source control setting time reaches 7.0s, the electric arc furnace main control system 7 sends the standby gas source control setting completion signal to the operation and display unit 5;

[0191] Step 2.5) After receiving the standby gas source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and sends the standby position control signal to the electric arc furnace main control system 7.

[0192] Step 2.6) After receiving the standby position control signal, the electric arc furnace main control system 7 moves the outlet of the embedded nozzle 2-1 to the outlet of the throat of the embedded bundled oxygen lance Laval nozzle 2-2 within the standby position setting time of 5.0s.

[0193] Step 2.7) After the standby position setting time reaches 5.0s, the electric arc furnace main control system 7 sends the standby position setting completion signal to the operation and display unit 5.

[0194] Step 3: Before the scrap loading begins in electric arc furnace 1, select the auxiliary heating mode. The specific control method is as follows:

[0195] Step 3.1) When the electric arc furnace 1 starts loading the scrap steel required for this furnace smelting, the electric arc furnace control system 7 sends the scrap steel melting start signal to the operation and display unit 5;

[0196] Step 3.2) After receiving the scrap steel melting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the heating gas source control signal to the electric arc furnace main control system 7.

[0197] Step 3.3) After receiving the heating gas source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen line 2-3, the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to 0.5 Nm3 / h, 800 Nm3 / h, 400 Nm3 / h, and 500 Nm3 / h respectively within the heating gas source control set time of 7.0 s. It also adjusts the gas supply medium of the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to oxygen, oxygen, oxygen, and natural gas respectively.

[0198] Step 3.4) After the heating gas source control setting time reaches 7.0s, the electric arc furnace main control system 7 sends the heating gas source control setting completion signal to the operation and display unit 5;

[0199] Step 3.5) After receiving the signal indicating that the heating gas source control setting is complete, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and reads the critical value of the molten pool temperature as 1395℃ and the critical value of the molten pool height change as 163mm.

[0200] Step 3.6) After completing the reading of the critical values ​​of molten pool temperature and molten pool height change, the operation and display unit 5 will send the start measurement signal to the electric arc furnace main control system 7;

[0201] Step 3.7) After receiving the start measurement signal, the electric arc furnace main control system 7 activates the temperature probe 3 and the distance probe 4;

[0202] Step 3.8) Temperature probe 3 and distance probe 4 continuously detect the molten pool temperature and molten pool height change, and continuously send the molten pool temperature measurement value and molten pool height change measurement value to operation and display unit 5;

[0203] Step 3.9) After receiving the measured values ​​of the molten pool temperature and the molten pool height change, the operation and display unit 5 compares them with the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change;

[0204] Step 3.10) If the measured value of the molten pool temperature does not reach the critical value of 1395℃, or the measured value of the change in molten pool height does not reach the critical value of 163mm, then return to step 3.9; if the measured value of the molten pool temperature reaches the critical value of 1395℃, and the measured value of the change in molten pool height reaches the critical value of 163mm, then the operation and display unit 5 sends the scrap steel melting end signal to the electric arc furnace main control system 7.

[0205] Step 4: After the scrap steel in electric arc furnace 1 has completely melted, select the oxygen supply operation mode. The specific control method is as follows:

[0206] Step 4-1) After receiving the scrap melting end signal, the electric arc furnace main control system 7 sends the steel smelting start signal to the operation and display unit 5;

[0207] Step 4-2) After receiving the steel smelting start signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2, and transmits the oxygen supply position control signal and depth measurement shutdown signal to the electric arc furnace main control system 7.

[0208] Step 4-3) After receiving the oxygen supply position control signal and the depth measurement shutdown signal, the electric arc furnace main control system 7 adjusts the outlet of the embedded nozzle 2-1 to the position with the shortest distance between the temperature measuring probe 3 and the distance measuring probe 4 within the oxygen supply position setting time of 5.0s, and simultaneously shuts down the distance measuring probe 4.

[0209] Step 4-4) When the oxygen supply position setting time reaches 5.0s, the electric arc furnace main control system 7 sends the oxygen supply position setting completion signal to the operation and display unit 5;

[0210] Steps 4-5) After receiving the oxygen supply position setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and transmits the oxygen supply source control signal to the electric arc furnace main control system 7.

[0211] Steps 4-6) After receiving the oxygen supply source control signal, the electric arc furnace main control system 7 adjusts the gas flow rates of the main oxygen line 2-3, the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to 2500 Nm3 / h, 1300 Nm3 / h, 200 Nm3 / h, and 200 Nm3 / h respectively within the oxygen supply source control set time of 7.0 s. It also adjusts the gas supply medium of the embedded nozzle gas line 2-4, the annular oxygen line 2-5, and the natural gas line 2-6 to oxygen, oxygen, oxygen, and natural gas respectively.

[0212] Steps 4-7) After the oxygen supply source control setting time reaches 7.0s, the electric arc furnace main control system 7 will send the oxygen supply source control setting completion signal to the operation and display unit 5;

[0213] Steps 4-8) After receiving the oxygen supply source control setting completion signal, the operation and display unit 5 runs the smelting method and control mode of the embedded cluster oxygen lance 2 and reads the final value of the molten pool temperature, 1613℃.

[0214] Steps 4-9) The operation and display unit 5 will receive the measured value of the molten pool temperature and compare it with the endpoint value of the molten pool temperature;

[0215] Step 4-10) If the measured value of the molten pool temperature does not reach the end value of the molten pool temperature, return to step 4-9; if the measured value of the molten pool temperature reaches the end value of the molten pool temperature, the operation and display unit 5 sends the steel smelting end signal to the electric arc furnace main control system 7.

[0216] Step 4-11) After receiving the steel smelting end signal, the electric arc furnace main control system 7 returns to step 2.1.

[0217] After adopting the control method of the present invention, the oxygen utilization rate is increased by 4.1%, the fuel consumption is reduced by 2.7%, the melting time of the electric arc furnace is shortened by 2.2 minutes, and the continuous working life of the embedded cluster oxygen lance is 483 furnace cycles.

[0218] The above-mentioned solution proposes a smelting method and control system with an embedded cluster oxygen lance structure for metallurgy, which can solve the technical problems in the prior art such as slow scrap melting speed, low oxygen utilization efficiency and insufficient stirring effect of the molten pool during the electric furnace melting period.

[0219] This invention provides a smelting method and control mode that automatically generates an embedded cluster oxygen lance based on the characteristics of different electric arc furnace smelting stages (such as oxygen supply flow range, molten pool temperature and molten pool depth), thereby improving the gas supply and heating efficiency of the electric furnace at different smelting stages, enhancing the overall smelting rhythm of the electric furnace, and increasing the service life of the embedded cluster oxygen lance.

[0220] This invention uses measurement signals of molten pool temperature and molten pool height changes to continuously control the working position of the embedded nozzle and the gas supply mode of the embedded cluster oxygen lance, thereby achieving online adjustment of the Laval nozzle throat structure and improving the oxygen jet penetration efficiency.

[0221] This invention controls the production mode during smelting to avoid human interference, intelligently determines the gas supply mode required for different smelting stages of the electric furnace, and increases the utilization efficiency of oxygen and fuel gas.

[0222] This invention reduces the total consumption of oxygen and fuel gas through a standby heat preservation mode, stabilizes the overall temperature of the molten pool, and prevents slag from being drawn into the interior of the embedded cluster oxygen lance.

[0223] This invention achieves the goal of shortening the melting time of scrap steel and improving the heating efficiency of the molten pool by using an auxiliary heating mode under a low-flow oxygen supply mode.

[0224] This invention meets the oxygen supply requirements during the decarburization period of the electric furnace through an oxygen supply operation mode, enhances the stirring effect of the molten pool, and increases the oxygen utilization efficiency.

[0225] The smelting method and control system of this invention improves oxygen utilization by more than 3.0%, reduces fuel consumption by more than 2.5%, shortens the melting time of electric arc furnace by more than 1.5 minutes, and has a continuous working life of more than 450 heats for the embedded cluster oxygen lance.

[0226] In summary, compared with other traditional methods, the method of this invention achieves efficient, stable, and safe production of electric arc furnaces at different smelting stages through smelting control production mode, standby heat preservation mode, auxiliary heating mode, and oxygen supply operation mode. It meets the design requirements of embedded cluster oxygen lances in terms of improving oxygen supply efficiency, increasing heating efficiency, and enhancing smelting rhythm and safety. It also comprehensively improves the technical indicators and economic benefits of electric arc furnace steelmaking processes, ensuring its broad application space in the field of electric arc furnace metallurgy. This method is simple to operate, environmentally friendly, low in cost, short in process, and highly efficient, which is conducive to large-scale industrial production and promotion.

[0227] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0228] In this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0229] It should be understood that, in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0230] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A smelting control system with an embedded cluster oxygen lance structure for metallurgy, characterized in that, The smelting control system includes a smelting control generation mode, a standby heat preservation mode, an auxiliary heating mode, and an oxygen supply operation mode. The smelting control system forms different smelting control modes for the embedded cluster oxygen lance in the logic judgment unit according to different embedded cluster oxygen lance structural parameters and typical smelting stage characteristics of electric arc furnace. It uses temperature detection element and distance detection element built into the tail of embedded nozzle to measure the molten pool temperature value and molten pool height change value. Based on the digital signals of molten pool temperature value and molten pool height change value, the logic judgment unit continuously controls the working position of embedded nozzle and the gas supply mode of embedded cluster oxygen lance. The embedded nozzle is installed inside the main oxygen circuit, and the air supply flow rate of the embedded nozzle ranges from 100 to 1500 Nm. 3 / h, the expansion angle formed by the inner diameter and outer diameter of the embedded nozzle is -5° to +5° different from the expansion angle of the embedded cluster oxygen gun Laval nozzle. The minimum distance between the outer diameter of the embedded nozzle and the inner diameter of the main oxygen circuit is 0.01-0.30mm. The gas supplied by the embedded nozzle is oxygen, nitrogen, argon, carbon dioxide or a mixture of the above four gases. The oxygen utilization rate of the smelting control system is increased by more than 3.0%, the fuel consumption is reduced by more than 2.5%, the melting time of the electric arc furnace is shortened by more than 1.5 minutes, and the continuous working life of the embedded cluster oxygen lance is more than 450 heats.

2. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 1, characterized in that, The core equipment used in the control system includes an electric arc furnace main control system, an embedded cluster oxygen lance, an embedded nozzle, a temperature probe, a distance probe, a logic judgment unit, and an operation and display unit.

3. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 2, characterized in that, The embedded cluster oxygen lance is equipped with an embedded nozzle. The temperature probe and distance probe are located at the tail of the embedded nozzle. The temperature probe and distance probe are connected to the operation and display unit, which is connected to the logic judgment unit. The electric arc furnace control system is connected to the electric arc furnace, the operation and display unit, and the logic judgment unit respectively.

4. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 2, characterized in that, The embedded cluster oxygen lance includes an embedded cluster oxygen lance Laval nozzle, an embedded nozzle, an embedded cluster oxygen lance Laval nozzle throat, a main oxygen passage, an embedded nozzle gas passage, an annular oxygen passage, and a natural gas passage; wherein: the embedded cluster oxygen lance Laval nozzle is the main structure, the embedded cluster oxygen lance Laval nozzle throat is located at the throat of the embedded cluster oxygen lance Laval nozzle, the embedded nozzle gas passage and the annular main oxygen passage are both connected to the embedded cluster oxygen lance Laval nozzle, the embedded nozzle gas passage is surrounded by the annular main oxygen passage, the annular main oxygen passage is surrounded by the annular natural gas passage, and the annular natural gas passage is surrounded by the annular oxygen passage.

5. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 1, characterized in that, The aforementioned smelting control generation mode includes the following steps: Step 1: After completing the overall assembly of the embedded cluster oxygen gun, adjust the embedded nozzle outlet to the position with the shortest distance between the temperature measuring probe and the distance measuring probe through the operation and display unit. Step 2: Input the throat length signal of the embedded cluster oxygen gun Laval nozzle to the logic judgment unit through the operation and display unit; Step 3: After receiving the throat length signal of the embedded cluster oxygen lance Laval nozzle, the logic judgment unit completes the storage of the throat length signal of the embedded cluster oxygen lance Laval nozzle and sends the preset debugging flow control signal to the electric arc furnace main control system. Step 4: After receiving the commissioning flow control signal, the electric arc furnace main control system will adjust the gas flow and gas type of the main oxygen circuit within the commissioning flow control time. Step 5: After the flow control debugging time is completed, the electric arc furnace main control system will send a flow control debugging setting completion signal to the operation and display unit; Step Six: After receiving the commissioning flow control setting completion signal, the operation and display unit transmits the internal positioning signal to the electric arc furnace main control system; Step 7: After receiving the internal positioning signal, the electric arc furnace main control system gradually moves the outlet position of the embedded nozzle closer to the inlet of the Laval nozzle throat of the embedded cluster oxygen lance, and continuously sends the gas flow and gas pressure signals of the main oxygen circuit to the logic judgment unit. Step 8: The logic judgment unit determines the distance between the outlet of the embedded nozzle and the inlet of the throat of the embedded cluster oxygen gun Laval nozzle based on the characteristics of gas flow and gas pressure changes in the main oxygen circuit, and stores it in the logic judgment unit. Step 9: Based on the length of the Laval nozzle throat of the embedded cluster oxygen lance, the distance between the outlet of the embedded nozzle and the inlet of the Laval nozzle throat of the embedded cluster oxygen lance stored in the logic judgment unit, and the characteristics of typical smelting stages of electric arc furnace, the logic judgment unit generates the smelting control mode of the embedded cluster oxygen lance. Step 10: The logic judgment unit transmits the generated smelting control mode of the embedded cluster oxygen lance to the operation and display unit; Step 11: After receiving the smelting control mode of the embedded cluster oxygen lance, the operation and display unit completes the loading of the smelting control mode of the embedded cluster oxygen lance.

6. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 1, characterized in that, The standby heat preservation mode includes the following steps: Step 1: The electric arc furnace control system transmits the end-of-cycle smelting signal to the operation and display unit; Step 2: After receiving the smelting endpoint signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and sends the standby gas source control signal to the electric arc furnace main control system. Step 3: After receiving the standby gas source control signal, the electric arc furnace main control system adjusts the gas flow and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the standby gas source control set time. Step 4: After the standby gas source control setting time ends, the electric arc furnace main control system will send the standby gas source control setting completion signal to the operation and display unit; Step 5: After receiving the standby gas source control setting completion signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and sends the standby position control signal to the electric arc furnace main control system. Step 6: After receiving the standby position control signal, the electric arc furnace main control system moves the embedded nozzle outlet to the throat outlet of the embedded bundled oxygen lance Laval nozzle within the standby position set time. Step 7: After the standby position setting time is completed, the electric arc furnace main control system will send a standby position setting completion signal to the operation and display unit.

7. A smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 1, characterized in that, The auxiliary heating mode includes the following steps: Step 1: When the electric arc furnace starts loading the scrap steel required for this smelting, the electric arc furnace control system sends the scrap steel melting start signal to the operation and display unit; Step 2: After receiving the scrap steel melting start signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and sends the heating gas source control signal to the electric arc furnace main control system. Step 3: After receiving the heating gas source control signal, the electric arc furnace main control system adjusts the gas flow rate and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the heating gas source control set time. Step 4: After the heating gas source control setting time is completed, the electric arc furnace main control system will send a signal indicating that the heating gas source control setting is complete to the operation and display unit; Step 5: After receiving the signal indicating that the heating gas source control setting is complete, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and reads the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change. Step Six: After completing the reading of the critical values ​​for molten pool temperature and molten pool height change, the operation and display unit will start sending measurement signals to the electric arc furnace main control system; Step 7: After receiving the start measurement signal, the electric arc furnace main control system activates the temperature probe and the distance probe; Step 8: The temperature probe and distance probe continuously detect the molten pool temperature and molten pool height change values, and continuously send the molten pool temperature measurement value and molten pool height change measurement value to the operation and display unit; Step 9: After receiving the measured values ​​of the molten pool temperature and the molten pool height change, the operation and display unit compares them with the critical values ​​of the molten pool temperature and the critical values ​​of the molten pool height change. Step 10: If the measured value of the molten pool temperature does not reach the critical value of the molten pool temperature, or the measured value of the change in molten pool height does not reach the critical value of the change in molten pool height, then return to Step 9 of the auxiliary heating mode; if the measured value of the molten pool temperature reaches the critical value of the molten pool temperature, and the measured value of the change in molten pool height reaches the critical value of the change in molten pool height, then the operation and display unit sends the scrap steel melting end signal to the electric arc furnace main control system.

8. The smelting control system with an embedded cluster oxygen lance structure for metallurgy according to claim 1, characterized in that, The oxygen supply operation mode includes the following steps: Step 1: After receiving the scrap melting completion signal, the electric arc furnace main control system sends the steel smelting start signal to the operation and display unit; Step 2: After receiving the steel smelting start signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and sends the oxygen supply position control signal and the depth measurement shutdown signal to the electric arc furnace main control system. Step 3: After receiving the oxygen supply position control signal and the depth measurement shutdown signal, the electric arc furnace main control system adjusts the embedded nozzle outlet to the position with the shortest distance between the temperature probe and the distance probe within the oxygen supply position set time, and simultaneously shuts off the distance probe. Step 4: After the oxygen supply position setting time is completed, the electric arc furnace main control system will send the oxygen supply position setting completion signal to the operation and display unit; Step 5: After receiving the oxygen supply position setting completion signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and transmits the oxygen supply source control signal to the electric arc furnace main control system. Step 6: After receiving the oxygen supply source control signal, the electric arc furnace main control system adjusts the gas flow rate and gas type of the main oxygen circuit, embedded nozzle gas circuit, annular oxygen circuit and natural gas circuit within the set time of the oxygen supply source control. Step 7: After the oxygen supply source control setting time is completed, the electric arc furnace main control system will send the oxygen supply source control setting completion signal to the operation and display unit; Step 8: After receiving the oxygen supply source control setting completion signal, the operation and display unit runs the smelting control mode of the embedded cluster oxygen lance and reads the final value of the molten pool temperature. Step 9: The operation and display unit will receive the measured value of the molten pool temperature and compare it with the endpoint value of the molten pool temperature; Step 10: If the measured value of the molten pool temperature does not reach the endpoint value of the molten pool temperature, return to step 9 of the oxygen supply operation mode; if the measured value of the molten pool temperature reaches the endpoint value of the molten pool temperature, the operation and display unit will send the steel smelting end signal to the electric arc furnace main control system. Step 11: After receiving the signal that the molten steel smelting has ended, the electric arc furnace main control system returns to the standby heat preservation mode.

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