Converter tapping molten steel deoxidation method and deoxidation system

Abstract

The converter tapping molten steel deoxidation method and deoxidation system disclosed by the application relate to the technical field of converter steelmaking, and the deoxidation method comprises a required deoxidation amount calculation step, a deoxidizer calculation step, a first deoxidation step and a second deoxidation step. The required deoxidation amount calculation step is to calculate the required deoxidation amount according to the end point oxygen content. The deoxidizer calculation step is to calculate the adding amount of the first deoxidizer and the second deoxidizer respectively through the required deoxidation amount. The first deoxidation step is to add the first adding amount of the first deoxidizer at the beginning of tapping. The second deoxidation step is to add the second adding amount of the second deoxidizer when the first tapping time is reached. The deoxidation method disclosed by the application can automatically calculate the adding amount of each deoxidizer according to the end point oxygen content of the converter and different deoxidation categories, and add each deoxidizer into the ladle, so as to realize precise dynamic deoxidation. Since the first deoxidizer is coke powder and its deoxidation product is CO, no new inclusions are generated in the steel, and the performance of the finished steel is improved.

Description

Technical Field

[0001] This invention relates to the field of converter steelmaking technology, and more specifically, to a method and system for deoxidizing molten steel tapped from a converter. Background Technology

[0002] One of the most researched areas in steel mills today is the production of clean steel, primarily focusing on refining and continuous casting processes. However, the development of converter control technology for clean steel production has been relatively slow. Converter steelmaking involves blowing oxygen into the furnace through an oxygen lance. The oxygen reacts with the carbon in the molten steel, achieving decarburization, dephosphorization, and desulfurization. However, oxygen blowing in steelmaking leads to an increase in the oxygen content of the molten steel. During the tapping process, this oxygen reacts with easily oxidized elements, generating oxide inclusions that contaminate the steel and cause irreversible and serious damage to the performance of the final steel product. Therefore, reducing the formation of oxide inclusions during converter tapping is a crucial issue.

[0003] Currently, deoxidation is mainly achieved by adding converter deoxidizers into the converter. However, the amount of converter deoxidizer added is not necessarily better the more it is added. When deoxidizing elements are added to steel, on the one hand, they can react with oxygen to reduce the oxygen concentration. On the other hand, they can affect the oxygen activity coefficient. When the concentration of deoxidizing elements is too high, it will reduce the oxygen activity coefficient, hinder the smooth progress of the deoxidation reaction, and instead lead to an increase in the oxygen content in the steel.

[0004] Therefore, how to achieve precise deoxidation to reduce the oxygen content and inclusions in molten steel has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for deoxidation of molten steel tapped from a converter, so as to achieve precise deoxidation and reduce the oxygen content and inclusions in the molten steel.

[0006] Another objective of this invention is to provide a converter tapping molten steel deoxidation system for precisely deoxidizing molten steel using the aforementioned converter tapping molten steel deoxidation method.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for deoxidizing molten steel tapped from a converter includes:

[0009] The required deoxygenation amount is calculated by determining the required deoxygenation amount based on the endpoint oxygen content.

[0010] Deoxidizer calculation: The amount of first deoxidizer and second deoxidizer added is calculated based on the required deoxidation amount. The amount of first deoxidizer added is the first addition amount, and the amount of second deoxidizer added is the second addition amount. The first deoxidizer is coke dust, and the second deoxidizer is aluminum manganese iron or silicon calcium barium.

[0011] The first deoxidation involves adding the first deoxidizer in the first amount at the beginning of steel tapping;

[0012] The second deoxidation is carried out when the first steel release time is reached, by adding the second amount of the second deoxidizer.

[0013] Optionally, in the above-mentioned deoxidation method for molten steel tapped from a converter, a mixed deoxidation step is further provided after the second deoxidation step;

[0014] The specific step of the mixed deoxidation step involves adding a third deoxidizer in a third amount when the second steel release time is reached.

[0015] The third deoxidizer comprises aluminum, aluminum oxide, silicon dioxide, calcium oxide, magnesium oxide, and water.

[0016] Optionally, the above-mentioned deoxidation method for molten steel tapping from a converter also includes a steel tapping time calculation step, which specifically involves collecting the steel tapping time of the day and calculating the average value to obtain the average steel tapping time.

[0017] The second deoxidation step specifically involves adding the second deoxidizer in the second amount when one-third of the average steel feeding time has been reached;

[0018] The specific step of the mixed deoxidation step involves adding the third deoxidizer at the third addition amount when 3 / 4 of the average steel feeding time has been reached.

[0019] Optionally, in the above-mentioned deoxidation method for molten steel tapped from a converter, the amount of the third deoxidizer added corresponds to the mass of the molten steel, and 1.0 kg of the third deoxidizer is added for every ton of molten steel.

[0020] Optionally, in the above-described deoxidation method for molten steel tapped from a converter, the deoxidizer calculation step includes:

[0021] The first calculation involves calculating the first addition amount based on the initial deoxygenation amount.

[0022] The second calculation involves determining the second addition amount based on the intermediate deoxygenation amount.

[0023] The first deoxidation step is located between the first calculation step and the second calculation step, and the initial deoxidation amount is the required deoxidation amount of the molten steel when tapping, and the intermediate deoxidation amount is the required deoxidation amount of the molten steel after deoxidation by the first deoxidizer.

[0024] Optionally, in the above-mentioned deoxidation method for molten steel tapped from a converter, the deoxidation amount per unit amount of the first deoxidizer is the first deoxidation amount, and the deoxidation amount per unit amount of the second deoxidizer is the second deoxidation amount.

[0025] The total deoxygenation amount of the first deoxidizing agent is equal to the product of the first addition amount and the first deoxygenation amount, and the total deoxygenation amount of the second deoxidizing agent is equal to the product of the second addition amount and the second deoxygenation amount;

[0026] The sum of the total deoxidation amount of the first deoxidizer and the total deoxidation amount of the second deoxidizer is equal to the required deoxidation amount of the molten steel at the time of tapping.

[0027] Optionally, in the above-mentioned deoxidation method for molten steel tapping from a converter, the total deoxidation amount of the first deoxidizer is 30% ± 0.5% of the required deoxidation amount of the molten steel at the time of tapping.

[0028] Optionally, in the above-mentioned deoxidation method for molten steel tapped from a converter, the first deoxidation step specifically involves the control system controlling the execution system to add the first amount of the first deoxidizer into the ladle when the converter rocking angle reaches a preset angle, the slide plate opens, and the ladle is in position.

[0029] A converter tapping molten steel deoxidation system, used for deoxidation of molten steel obtained by the above-mentioned converter tapping molten steel deoxidation method, comprising:

[0030] A measuring device used to collect the final oxygen content of molten steel in a converter;

[0031] The control system, electrically connected to the measuring device, is used to receive the endpoint oxygen content measured by the measuring device and calculate the required deoxygenation amount, and the control system is used to calculate the first addition amount and the second addition amount based on the required deoxygenation amount;

[0032] An execution system, electrically connected to the control system, is used to receive the first addition amount and the second addition amount calculated by the control system, so as to perform the action of weighing and adding the first addition amount of the first deoxidizer into the ladle, and to perform the action of weighing and adding the second addition amount of the second deoxidizer into the ladle, wherein the timing of adding the first deoxidizer and the second deoxidizer is controlled by the control system.

[0033] Optionally, the above-mentioned converter tapping molten steel deoxidation system further includes a tapping signal monitoring device, which includes:

[0034] A furnace shaking angle signal acquisition device is used to detect the angle of the converter shaking, and the furnace shaking angle signal acquisition device is electrically connected to the control system;

[0035] A slide plate switch detection device is used to detect whether the converter slide plate is open, and the slide plate switch detection device is electrically connected to the control system;

[0036] A ladle arrival detection device is used to detect whether the ladle is in place, and the ladle arrival detection device is electrically connected to the control system.

[0037] The deoxidation method for molten steel tapping from a converter provided by this invention includes a required deoxidation amount calculation step, a deoxidizer calculation step, a first deoxidation step, and a second deoxidation step. The required deoxidation amount calculation step specifically involves calculating the required deoxidation amount from the final oxygen content of the molten steel in the converter. The deoxidizer calculation step specifically involves calculating the addition amounts of the first deoxidizer and the second deoxidizer based on the measured required deoxidation amount, wherein the first deoxidizer is coke fines, and the second deoxidizer is aluminum manganese ferrophosphate or silicon calcium barium. The addition amount of the first deoxidizer is defined as the first addition amount, and the addition amount of the second deoxidizer is defined as the second addition amount. The first deoxidation step specifically involves adding the first addition amount of the first deoxidizer at the beginning of tapping. The second deoxidation step specifically involves adding the second addition amount of the second deoxidizer when the first tapping time is reached.

[0038] Compared to existing technologies, the converter steel deoxidation method provided by this invention can automatically calculate the amount of each deoxidizer to be added based on the oxygen content at the converter endpoint and different deoxidation categories. The deoxidizer is then added to the ladle during converter tapping, achieving precise dynamic deoxidation and avoiding problems of insufficient or excessive deoxidation. Furthermore, using low-cost coke powder for deoxidation reduces costs and the consumption of a second deoxidizer. Since the deoxidation product of coke powder deoxidation is CO, it prevents the formation of new inclusions in the steel. The generated CO also enhances the stirring of the molten steel and promotes a rise in steel temperature during tapping, resulting in more uniform steel composition and the floating of inclusions, thereby reducing inclusions in the molten steel and improving the performance of the finished steel.

[0039] The converter molten steel deoxidation system provided by this invention is used for deoxidation of molten steel using the aforementioned converter molten steel deoxidation method. It includes a measuring device, a control system, and an execution system. The measuring device is used to collect the final oxygen content of the molten steel in the converter. The control system is electrically connected to the measuring device and is used to receive the final oxygen content measured by the measuring device and calculate the required deoxidation amount. The control system can calculate the amount of a first deoxidizer added (first addition amount) and the amount of a second deoxidizer added (second addition amount) based on the required deoxidation amount. The execution system is electrically connected to the control system and is used to receive the first and second addition amounts calculated by the control system to perform the actions of weighing the first addition amount of the first deoxidizer and adding it to the ladle, and weighing the second addition amount of the second deoxidizer and adding it to the ladle. The timing of adding both the first and second deoxidizers is controlled by the control system.

[0040] Compared with existing technologies, the converter tapping molten steel deoxidation system provided by this invention can automatically weigh each deoxidizer and accurately control the timing of its addition, reducing human interference and thus achieving precise deoxidation. It can also effectively prevent insufficient or excessive deoxidation of molten steel and reduce the consumption of deoxidizers. Precise deoxidation can greatly improve the refining station conditions and facilitate rapid slag formation in refining. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are 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.

[0042] Figure 1 The process flow of the converter tapping molten steel deoxidation method disclosed in this embodiment of the invention. Figure 1 ;

[0043] Figure 2 The process flow of the converter tapping molten steel deoxidation method disclosed in this embodiment of the invention. Figure 2 ;

[0044] Figure 3 The process flow of the converter tapping molten steel deoxidation method disclosed in this embodiment of the invention. Figure 3 . Detailed Implementation

[0045] The core of this invention is to disclose a method for deoxidizing molten steel from a converter, so as to achieve precise deoxidation and reduce the oxygen content and inclusions in the molten steel.

[0046] Another core aspect of this invention is the disclosure of a converter tapping molten steel deoxidation system, used to precisely deoxidize molten steel using the aforementioned converter tapping molten steel deoxidation method.

[0047] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the invention as described in the claims. It should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings. Unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] Combination Figure 1 The deoxidation method for molten steel tapped from a converter disclosed in this invention includes a step of calculating the required deoxidation amount, a step of calculating the deoxidizer, a first deoxidation step, and a second deoxidation step.

[0049] S10, Calculation of required deoxygenation capacity;

[0050] The required deoxidation amount is calculated from the final oxygen content of the molten steel in the converter. Specifically, the oxygen content in the molten steel can be detected by an oxygen sensor. The measured result is transmitted to the control system, where the calculation module of the control system can calculate the required deoxidation amount.

[0051] S20, deoxidizer calculation;

[0052] The amount of the first deoxidizer and the amount of the second deoxidizer added are calculated based on the measured required deoxidation amount. The first deoxidizer is coke powder, and the second deoxidizer is aluminum manganese iron or silicon calcium barium. The amount of the first deoxidizer added is defined as the first addition amount, and the amount of the second deoxidizer added is defined as the second addition amount.

[0053] Depending on the type of the second deoxidizer, the deoxidation type also varies. Specifically, aluminum-killed steel can be prepared by adding aluminum-manganese-iron, and silicon-killed steel can be prepared by adding silicon-calcium-barium.

[0054] S30, first deoxygenation;

[0055] The first deoxidizer is added at the beginning of steel tapping. The carbon in the coke fines plays a deoxidizing role. Using low-cost coke fines for deoxidation can reduce deoxidation costs and the consumption of the second deoxidizer. Moreover, the deoxidation product of coke fines is CO, which can prevent the formation of new inclusions in the steel. The generated CO can also enhance the stirring of the molten steel and promote the rise of the molten steel temperature during tapping, making the molten steel composition uniform and causing inclusions to float to the surface. This can reduce the inclusions in the molten steel and improve the performance of the finished steel.

[0056] Specifically, in S10, when the converter rocking angle reaches the preset angle, the slide plate opens, and a ladle positioning signal is detected, tapping begins, and the control system controls the execution system to add a first amount of first deoxidizer into the ladle.

[0057] S40, second deoxygenation;

[0058] When the first steel tapping time is reached, a second deoxidizer is added in a second quantity. The deoxidation of the molten steel is completed through the addition of the second deoxidizer. S40 is set after S30 to avoid the stronger deoxidizing agent affecting the deoxidizing effect of the first deoxidizer.

[0059] Compared with the prior art, the deoxidation method for molten steel tapping from the converter disclosed in this invention can automatically calculate the amount of each deoxidizer to be added based on the oxygen content at the converter endpoint and different deoxidation categories, and add each deoxidizer to the ladle when tapping steel from the converter, which can achieve precise dynamic deoxidation and avoid the problems of insufficient deoxidation or excessive addition of deoxidizer.

[0060] To further improve the deoxidation effect and reduce refining time, combined with Figure 2 A mixed deoxygenation step is set after S30.

[0061] S50, mixed deoxygenation;

[0062] When the second steel release time is reached, a third deoxidizer is added in a third amount. The components of the third deoxidizer include aluminum, alumina, silicon dioxide, calcium oxide, magnesium oxide and water.

[0063] The second tapping time is after the first tapping time. By adding a third deoxidizer in the later stage of tapping, the molten steel and slag can be further deoxidized, and the slag can reach the yellow-white slag state in advance, thus achieving the purpose of early slag formation and reducing refining time.

[0064] In order to accurately control the addition time of each deoxidizer, the deoxidation method for molten steel tapping from the converter disclosed in this embodiment also includes a step of calculating the tapping time.

[0065] S60, Calculation of steel release time;

[0066] The average steel release time is obtained by collecting the daily steel release time and calculating the average value.

[0067] Correspondingly, S30 specifically involves adding a second amount of the second deoxidizer into the ladle when the steel feeding time reaches 1 / 3 of the average steel feeding time.

[0068] S50 specifically refers to adding a third deoxidizer to the ladle at a third amount when the steel feeding time reaches 3 / 4 of the average steel feeding time.

[0069] In addition, empirical values ​​can be used to set the average steel feeding time.

[0070] Let the deoxidation amount of a unit amount of the first deoxidizer added be defined as the first deoxidation amount, and the deoxidation amount of a unit amount of the second deoxidizer added be defined as the second deoxidation amount. Then, the total deoxidation amount of the first deoxidizer is equal to the product of the first addition amount and the first deoxidation amount, and the total deoxidation amount of the second deoxidizer is equal to the product of the second addition amount and the second deoxidation amount. Moreover, the sum of the total deoxidation amount of the first deoxidizer and the total deoxidation amount of the second deoxidizer is equal to the required deoxidation amount of the molten steel at the time of tapping. That is, theoretically, the oxygen in the molten steel can be completely removed by adding the first and second deoxidizers. On this basis, the addition of the third deoxidizer can ensure that the deoxidation of the molten steel and slag is more thorough, resulting in better steel quality.

[0071] The calculation of the first and second addition amounts can be completed simultaneously or in stages. Simultaneous calculation involves performing a final oxygen content calculation before tapping begins, and then simultaneously calculating the values ​​of the first and second addition amounts based on this result. Staged calculation involves calculating the required deoxidation amount based on the final oxygen content before tapping begins, then calculating the first addition amount based on this required deoxidation amount and a pre-set deoxidation distribution ratio of the first deoxidizer (e.g., using 30% coke dust deoxidation). Then, during tapping, after the first deoxidizer is added and before the second deoxidizer is added, the final oxygen content is measured again, and the second addition amount is calculated accordingly. The second deoxidizer is used to remove all remaining oxygen from the molten steel.

[0072] Combination Figure 3 In a specific embodiment disclosed in this invention, S20 includes:

[0073] S21, First Calculation;

[0074] The first addition amount is calculated based on the initial deoxidation amount, where the initial deoxidation amount is the required deoxidation amount of the molten steel at the time of tapping.

[0075] S22, Second Calculation

[0076] The second addition amount is calculated by the intermediate deoxidation amount, where the intermediate deoxidation amount is the required deoxidation amount of the molten steel after deoxidation by the first deoxidizer.

[0077] S30 is located between S21 and S22. Compared to directly calculating the second addition amount from the initial deoxygenation amount, calculating the second addition amount from the intermediate deoxygenation amount can dynamically adjust the addition amount of the second deoxygenator by combining the actual deoxygenation effect of the first deoxygenator, thereby further improving the precise deoxygenation effect.

[0078] The timing for collecting and calculating the intermediate amount of deoxidizing agent is set some time before the addition of the second deoxidizing agent, so as to ensure the full reaction of the first deoxidizing agent, while not affecting the weighing of the second amount of the second deoxidizing agent added.

[0079] The calculation of the first and second addition amounts is implemented by the weighing module of the control system. Correspondingly, a weighing step is also included after S20.

[0080] S70, Weighing;

[0081] The control system feeds back the values ​​of the first and second addition amounts to the execution system, which weighs the first amount of the first deoxidizer and the second amount of the second deoxidizer, respectively.

[0082] When the calculation of the first and second addition amounts is performed step-by-step, that is, when S20 is divided into S21 and S22 as described above, then S70 includes:

[0083] S71, First Weighing;

[0084] Weigh the first amount of the first deoxidizer added, and S71 is located between S21 and S30.

[0085] S72, Second Weighing;

[0086] Weigh the second amount of the second deoxidizer added, with S72 located between S22 and S40.

[0087] The amount of the third deoxidizer added is related to the total mass of the molten steel. Therefore, the amount of the third deoxidizer can be calculated from a set value or from the actual mass of the molten steel. The weighing of the third deoxidizer can be carried out before S50.

[0088] Specifically, the deoxygenation capacity of each deoxidizer can be calculated as follows:

[0089] (1) Calculation of deoxidation amount of aluminum manganese iron

[0090] 2Al + 3O = Al₂O₃

[0091] Ferromanganese contains 56% aluminum. Assuming 60% aluminum participates in deoxidation, and the total steel output is 130 tons, then theoretically 10 kg of ferromanganese can be deoxidized.

[0092] 10*56%*60%*48 / 54 / (130*1000)=23ppm

[0093] The deoxidation amount of 10 kg of aluminum manganese iron is calculated to be 23 ppm.

[0094] (2) Calculation of silicon, calcium and barium deoxygenation

[0095] Si + O₂ = SiO₂

[0096] The silicon-calcium-barium alloy contains 58% silicon. Assuming silicon contributes 30% to deoxidation, and the total steel output is 130 tons, then 10 kg of silicon-calcium-barium alloy can deoxidize the steel.

[0097] 10*58%*30%*32 / 24 / (130*1000)=17ppm

[0098] Calculations show that the deoxygenation amount of 10 kg of barium silicate is 17 ppm.

[0099] (2) Calculation of deoxidation amount of coke pre-deoxidation

[0100] C + O = CO

[0101] Coke dust contains 98% carbon. Assuming 60% of the coke dust participates in deoxidation, and the total steel output is 130 tons, then 10 kg of coke dust can be deoxidized.

[0102] 10*98%*60%*16 / 12 / (130*1000)=58ppm

[0103] The calculated deoxygenation amount of 10 kg of coke is 58 ppm.

[0104] Therefore, the control system can calculate the amount of each deoxidizer to be added according to the calculation results in Table 1.

[0105] Table 1

[0106]

[0107] Specifically, the total deoxidation amount of the first deoxidizer is 30% ± 0.5% of the required deoxidation amount. By using coke dust for deoxidation of 30%, the inclusions in the steel are reduced by 30%, which is beneficial to improving the performance of the finished steel.

[0108] The amount of the third deoxidizer (mixed deoxidizer) added corresponds to the mass of the molten steel, with 1.0 kg of the third deoxidizer added for every ton of molten steel. Specifically, the composition and particle size of the third deoxidizer are shown in Table 2.

[0109] Table 2

[0110]

[0111] Using the deoxidation method for molten steel from the converter as disclosed in the embodiments of the present invention, 10 heats of steel were continuously produced in a 120t converter, including 5 heats of silicon killed steel and 5 heats of aluminum killed steel, as Examples 1-10. The control conditions are shown in Tables 3 and 4.

[0112] Table 3 Deoxidation Test of Silicon Killed Steel

[0113]

[0114] Table 4 Deoxidation Experiment of Aluminum-Killed Steel

[0115]

[0116] Table 3 shows that the average amount of coke powder added to silicon-killed steel is 22 kg, the average amount of silicon-calcium-barium added is 175.5 kg, and the average oxygen content at the refining station is 7.8 ppm, which is 8 ppm lower than the average oxygen content at the station for normal heats. This saves an average of 75 kg of silicon-calcium-barium per heat, and the inclusions in the molten steel are significantly reduced, resulting in a significant reduction in deoxidizer costs.

[0117] Table 4 shows that the average amount of coke powder added to aluminum-killed steel is 25.5 kg, the average amount of aluminum-manganese ferromanganese added is 150.1 kg, and the average oxygen content at the refining station is 1.2 ppm, which is 3 ppm lower than the average oxygen content at the station for normal heats. This saves an average of 64.33 kg of aluminum-manganese ferromanganese per heat, and the inclusions in the molten steel are significantly reduced, resulting in a significant reduction in deoxidizer costs.

[0118] The converter tapping molten steel deoxidation system disclosed in this invention is used for deoxidation using the aforementioned converter tapping molten steel deoxidation method. It includes a measuring device, a control system, and an execution system. The measuring device is used to collect the final oxygen content of the molten steel in the converter. The control system is electrically connected to the measuring device and is used to receive the final oxygen content measured by the measuring device and calculate the required deoxidation amount. The control system can calculate the amount of a first deoxidizer added (first addition amount) and the amount of a second deoxidizer added (second addition amount) based on the required deoxidation amount. The execution system is electrically connected to the control system and is used to receive the first and second addition amounts calculated by the control system to perform the actions of weighing the first addition amount of the first deoxidizer and adding it to the ladle, and weighing the second addition amount of the second deoxidizer and adding it to the ladle. The timing of adding both the first and second deoxidizers is controlled by the control system.

[0119] Compared with existing technologies, the converter tapping molten steel deoxidation system disclosed in this invention can automatically weigh each deoxidizer and precisely control the timing of its addition, reducing human interference and thus achieving precise deoxidation. It can also effectively prevent insufficient or excessive deoxidation of molten steel and reduce the consumption of deoxidizers. Precise deoxidation can greatly improve the refining station conditions and facilitate rapid slag formation in refining.

[0120] The control system (embedded in the industrial secondary system) is connected to the converter sub-lance system. The sub-lance TSO probe serves as a measuring device for the deoxidation system of the molten steel tapped from the converter. After the measuring device measures the final oxygen content, the control system calculates the amount of each deoxidizer added and feeds the calculation results back to the execution system for weighing each deoxidizer.

[0121] The control system first calculates the amount of coke dust that can be removed, representing 30% of the required deoxidation, and feeds this information back to the execution system for weighing. When the control system detects the start of steel tapping, it instructs the execution system to automatically add coke dust. At this point, the control system calculates the amount of aluminum manganese ferromanganese or silicon calcium barium to be added based on the final oxygen content (required deoxidation amount) minus the amount of coke dust deoxidation, and feeds this information back to the execution system for weighing the second deoxidizer. When the control system detects that the first steel tapping time has been reached, it instructs the execution system to add aluminum manganese ferromanganese or silicon calcium barium.

[0122] In order to monitor the timing of molten steel tapping in real time, the converter tapping molten steel deoxidation system disclosed in this embodiment of the invention also includes a tapping signal monitoring device, which includes a furnace rocking angle signal acquisition device, a slide switch detection device, and a ladle positioning detection device.

[0123] The converter rocking angle signal acquisition device is used to detect the angle of the converter rocking action and is electrically connected to the control system. The slide plate switch detection device is used to detect whether the converter slide plate is open and is also electrically connected to the control system. The ladle positioning detection device is used to detect whether the ladle is in position and is also electrically connected to the control system.

[0124] When the furnace rocking angle signal acquisition device detects that the converter rocking angle has reached the preset angle, the slide switch detection device detects that the slide is open, and the ladle positioning detection device detects that the ladle is in position, and all three signals are fed back to the control system, it indicates that tapping has begun. The control system then controls the execution system to add the first amount of the first deoxidizer into the ladle.

[0125] In one embodiment, the automatic weighing module of the control system calculates the addition amounts of the first and second deoxidizers based on the final oxygen content. The control system controls the execution system to weigh the first amount of coke powder and the second amount of aluminum manganese ferromanganese or silicon calcium barium, respectively. When the tapping signal monitoring device detects that the converter rocking angle reaches -75°, and both the slide opening signal and the ladle positioning signal are fed back to the control system, the control system controls the execution system to add coke powder into the ladle. When the first tapping time is reached, the control system controls the execution system to add aluminum manganese ferromanganese or silicon calcium barium into the ladle. When the second tapping time is reached, the control system controls the execution system to add a third deoxidizer into the ladle.

[0126] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment without being explicitly excluded by another embodiment. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of deoxidizing molten steel tapped from a converter, characterized by, include: The average steel release time is calculated by collecting the daily steel release time and averaging the average steel release time. The required deoxygenation amount is calculated by determining the required deoxygenation amount based on the endpoint oxygen content. The deoxidizer calculation involves determining the addition amounts of a first deoxidizer and a second deoxidizer based on the required deoxidation amount. The first deoxidizer is referred to as the first addition amount, and the second deoxidizer is referred to as the second addition amount. The first deoxidizer is coke dust, and the second deoxidizer is either aluminum manganese ferro or silicon calcium barium. The first addition amount of the first deoxidizer is calculated based on the required deoxidation amount and a set deoxidation distribution ratio. The second addition amount of the second deoxidizer is calculated based on the remaining required deoxidation amount after deducting the amount deoxidized by the first deoxidizer. The first deoxidation involves adding the first deoxidizer in the first amount at the beginning of steel tapping; The second deoxidation is carried out when 1 / 3 of the average steel feeding time is reached, by adding the second amount of the second deoxidizer. Mixed deoxidation involves adding a third deoxidizer at a third dosage when 3 / 4 of the average steel discharging time has been reached. The third deoxidizer comprises aluminum, alumina, silicon dioxide, calcium oxide, magnesium oxide, and water. The dosage of the third deoxidizer corresponds to the mass of the molten steel, with 1.0 kg of the third deoxidizer added per ton of molten steel.

2. The method of deoxidizing molten steel tapped from a converter according to claim 1, characterized by, The deoxidizer calculation steps include: The first calculation involves calculating the first addition amount based on the initial deoxygenation amount. The second calculation involves determining the second addition amount based on the intermediate deoxygenation amount. The first deoxidation step is located between the first calculation step and the second calculation step, and the initial deoxidation amount is the required deoxidation amount of the molten steel when tapping, and the intermediate deoxidation amount is the required deoxidation amount of the molten steel after deoxidation by the first deoxidizer.

3. The method of deoxidizing molten steel tapped from a converter according to claim 1, characterized by, The amount of oxygen removed per unit amount of the first deoxidizing agent is the first deoxidizing amount, and the amount of oxygen removed per unit amount of the second deoxidizing agent is the second deoxidizing amount. The total deoxygenation amount of the first deoxidizing agent is equal to the product of the first addition amount and the first deoxygenation amount, and the total deoxygenation amount of the second deoxidizing agent is equal to the product of the second addition amount and the second deoxygenation amount; The sum of the total deoxidation amount of the first deoxidizer and the total deoxidation amount of the second deoxidizer is equal to the required deoxidation amount of the molten steel at the time of tapping.

4. The method for deoxidizing molten steel tapped from a converter as described in claim 3, characterized in that, The total deoxidation amount of the first deoxidizer is 30% ± 0.5% of the required deoxidation amount of the molten steel at the time of tapping.

5. The method for deoxidizing molten steel tapped from a converter as described in claim 1, characterized in that, The first deoxidation step specifically involves the control system controlling the execution system to add the first amount of the first deoxidizer into the ladle when the converter rocking angle reaches the preset angle, the slide plate opens, and the ladle is in place.

6. A deoxidation system for molten steel tapped from a converter, characterized in that, For deoxidation using the deoxidation method for molten steel tapped from a converter as described in any one of claims 1 to 5, comprising: A measuring device used to collect the final oxygen content of molten steel in a converter; The control system, electrically connected to the measuring device, is used to receive the endpoint oxygen content measured by the measuring device and calculate the required deoxygenation amount, and the control system is used to calculate the first addition amount and the second addition amount based on the required deoxygenation amount; An execution system, electrically connected to the control system, is used to receive the first addition amount and the second addition amount calculated by the control system, so as to perform the action of weighing and adding the first addition amount of the first deoxidizer into the ladle, and to perform the action of weighing and adding the second addition amount of the second deoxidizer into the ladle, wherein the timing of adding the first deoxidizer and the second deoxidizer is controlled by the control system.

7. The converter tapping molten steel deoxidation system as described in claim 6, characterized in that, It also includes a steel tapping signal monitoring device, which comprises: A furnace shaking angle signal acquisition device is used to detect the angle of the converter shaking, and the furnace shaking angle signal acquisition device is electrically connected to the control system; A slide plate switch detection device is used to detect whether the converter slide plate is open, and the slide plate switch detection device is electrically connected to the control system; A ladle arrival detection device is used to detect whether the ladle is in place, and the ladle arrival detection device is electrically connected to the control system.

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