Method for improving converter tapping alloying uniformity

Abstract

The invention discloses a method for improving converter tapping alloying uniformity, which comprises the following steps of: before tapping, pre-configuring an alloy amount to an alloy stock bin, and acquiring the initial weight W0 of an alloy baking furnace; in the tapping process, the tapping amount is monitored in real time through the weighing system, and data is transmitted to the control system; when the tapping amount reaches a preset trigger threshold value, a control system starts an alloy stock bin valve for the first time, and the valve is operated to be opened and closed according to a periodic control mode; the weight change value X in the alloy baking furnace is calculated in real time, and the action of the turning plate oil cylinder is adjusted according to the comparison result of the weight change value X and the dynamic threshold value; and when the weight of the residual alloy in the stock bin is lower than a preset residual material threshold value, the final action of fully opening the turning plate oil cylinder is executed until the alloy is completely added. Based on the initial weight of the alloy baking furnace, the action of a turning plate oil cylinder is adjusted in real time through a dynamic threshold value, the periodic control logic adapts to the change of the tapping rate, and alloy accumulation or incomplete melting is avoided.

Description

Technical Field

[0001] This invention relates to the field of steelmaking converter technology, and in particular to a method for improving the uniformity of alloying in converter steel output. Background Technology

[0002] In existing technologies, alloy addition typically relies on the furnace operator's visual estimation of the steel tapping rate to control the opening and closing of the alloy hopper. In one implemented technology, when the steel tapping rate reaches 20 tons, the furnace operator manually opens the alloy hopper valve and closes it after 10 seconds; when two-thirds of the steel has been tapped, the valve is reopened to add the remaining alloy. This method is susceptible to operator subjective judgment and is prone to deviations in the timing of alloy addition due to fluctuations in the tapping rate or human error. Differences in tapping time may result in alloy being added too early or too late, causing localized excessively high alloy concentrations or incomplete melting, ultimately leading to large fluctuations in the molten steel composition and severely affecting the consistency of product performance.

[0003] Some improved solutions use a PLC program to control valve actions according to preset time nodes, opening the alloy hopper at fixed intervals after steel tapping begins. However, the actual tapping rate is affected by factors such as the fluidity of molten steel and the tilting angle of the converter, making it difficult for fixed-time control to dynamically adapt to real-time changes in the tapping volume. If the tapping rate is increased, the alloy may be added before it is fully melted; conversely, if the tapping rate is too slow, the alloy accumulates on the surface of the molten steel, exacerbating compositional stratification. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to propose a method to improve the alloying uniformity of converter steel tapping, so as to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is: a method for improving the alloying uniformity of steel tapped from a converter, comprising the following steps:

[0006] Before tapping the steel, the amount of alloy is pre-configured into the alloy silo, and the initial weight W0 of the alloy baking furnace is obtained.

[0007] During the tapping process, the tapping volume is monitored in real time by a weighing system, and the data is transmitted to the control system.

[0008] When the steel output reaches the preset trigger threshold, the control system starts the alloy silo valve for the first time and operates the valve opening and closing in a periodic control manner.

[0009] The weight change value X inside the alloy baking furnace is calculated in real time, and the action of the tilting cylinder is adjusted according to the comparison result of the weight change value X and the dynamic threshold.

[0010] When the remaining alloy weight in the hopper is lower than the preset remaining material threshold, the final action of the fully open flap cylinder is executed until the alloy is completely added.

[0011] As a further improvement of the present invention: the real-time monitoring of the steel output through the weighing system includes: real-time monitoring of the steel output through the steel car weighing system.

[0012] As a further improvement of the present invention: the periodic control logic includes:

[0013] The valve's single opening duration is the predetermined opening duration;

[0014] The interval between two consecutive valve opening actions is the predetermined operating cycle.

[0015] As a further improvement of the present invention: the predetermined opening duration is 80ms, the predetermined action cycle is 250ms, and the interval between two adjacent opening actions is 170ms.

[0016] As a further improvement of the present invention: the preset trigger threshold is 15 tons, and the duration of opening the alloy silo valve for the first time is 80ms.

[0017] As a further improvement of the present invention: the dynamic threshold includes a first threshold and a second threshold, wherein the first threshold is W0 / (90×4);

[0018] The second threshold is W0 / (130×4).

[0019] As a further improvement of the present invention: the adjustment of the flap cylinder action based on the comparison result of the weight change value X and the dynamic threshold includes;

[0020] When X > W0 / (90×4), control the flap cylinder to close for 80ms;

[0021] When X < W0 / (130×4), control the flap cylinder to open for 80ms.

[0022] As a further improvement of the present invention: the preset residual material threshold is 20kg, and the duration of the final action is 15 seconds.

[0023] When the weight of the alloy in the alloy hopper is less than 20kg, control the flap cylinder to be fully open and hold for 15 seconds before closing.

[0024] As a further improvement of the present invention, the method further includes:

[0025] A pressure sensor is installed inside the permeable brick to monitor the gas pressure inside the permeable brick in real time.

[0026] When the pressure exceeds the preset safety threshold, an alarm is triggered and the addition of alloy is suspended. The safety threshold is 0.5 MPa to 1.0 MPa.

[0027] Once the pressure returns to normal, the alloy addition process will automatically restart.

[0028] As a further improvement of the present invention: the driving gas for the alloy hopper valve is propane.

[0029] As a further improvement of the present invention: the method constrains the shortest steel tapping time to 2.5 minutes;

[0030] If the actual tapping time is less than 2.5 minutes, the control system will proportionally compress the action interval cycle in the periodic control logic to ensure that the alloy is added before the tapping is completed.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention employs a steel cart weighing system to monitor the steel output in real time and links it with a PLC control system. When the steel output reaches a preset trigger threshold, the alloy silo valve is precisely triggered, eliminating human error and ensuring a strict match between the alloy addition timing and the steel output. Based on the initial weight of the alloy baking furnace, the action of the flap cylinder is adjusted in real time through dynamic thresholds. The periodic control logic adapts to changes in the steel output rate, preventing alloy accumulation or incomplete melting. Furthermore, a preset residual material threshold triggers the flap cylinder to fully open, ensuring complete alloy addition. Pressure sensors inside the permeable bricks monitor the risk of blockage in real time, automatically pausing and triggering an alarm. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0034] In order to clearly and completely understand the technical solution, the present invention will be further described in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] An embodiment of the present invention provides a method for improving the alloying uniformity of converter steel, comprising the following steps:

[0039] Before tapping the steel, the amount of alloy is pre-configured into the alloy silo, and the initial weight W0 of the alloy baking furnace is obtained.

[0040] During the tapping process, the tapping volume is monitored in real time by a weighing system, and the data is transmitted to the control system.

[0041] When the steel output reaches the preset trigger threshold, the control system starts the alloy silo valve for the first time and operates the valve opening and closing in a periodic control manner.

[0042] The weight change value X inside the alloy baking furnace is calculated in real time, and the action of the tilting cylinder is adjusted according to the comparison result of the weight change value X and the dynamic threshold.

[0043] When the remaining alloy weight in the hopper is lower than the preset remaining material threshold, the final action of the fully open flap cylinder is executed until the alloy is completely added.

[0044] This invention employs a steel cart weighing system to monitor the steel output in real time and links it with a PLC control system. When the steel output reaches a preset trigger threshold, the alloy silo valve is precisely triggered, eliminating human error and ensuring a strict match between the alloy addition timing and the steel output. Based on the initial weight of the alloy baking furnace, the action of the flap cylinder is adjusted in real time through dynamic thresholds. The periodic control logic adapts to changes in the steel output rate, preventing alloy accumulation or incomplete melting. Furthermore, a preset residual material threshold triggers the flap cylinder to fully open, ensuring complete alloy addition. Pressure sensors inside the permeable bricks monitor the risk of blockage in real time, automatically pausing and triggering an alarm.

[0045] In one embodiment of the present invention, the real-time monitoring of the steel tapping amount via a weighing system includes: real-time monitoring of the steel tapping amount via a steel car weighing system. Real-time monitoring of the steel tapping amount via the steel car weighing system reduces data errors, ensures strict synchronization between alloy addition and steel tapping amount, and the real-time feedback from the weighing system enables the control system to automatically adapt to changes in the steel tapping rate.

[0046] In one embodiment of the present invention, the periodic control logic includes:

[0047] The valve's single opening duration is the predetermined opening duration;

[0048] The interval between two consecutive valve opening actions is the predetermined operating cycle.

[0049] Furthermore, the predetermined activation duration is 80ms, the predetermined action cycle is 250ms, and the interval between two adjacent activation actions is 170ms.

[0050] By setting the duration of each valve opening and the interval between adjacent actions, the system ensures that the alloy is added to the molten steel at a fixed rhythm, precisely controlling the valve opening sequence. The periodic logic provides a standardized operating framework for the control system. By adjusting predetermined parameters, it can adapt to different steel tapping rates, preventing alloy accumulation or insufficiency. An 80ms opening duration and a 250ms period are the baseline values; in practical applications, fine-tuning can be used to adapt to changes in the steel tapping rate, ensuring uniform alloy addition even under extreme conditions. Uniform alloy distribution reduces the need for composition adjustments, shortening the refining time per heat by 5-8 minutes. The 170ms interval provides a buffer for the valves and actuators, reducing frequent actions.

[0051] In one embodiment of the invention, the preset trigger threshold is 15 tons, and the initial opening time of the alloy silo valve is 80 ms. The steel output is monitored in real time by a weighing system. When the weight precisely reaches 15 tons, the valve is automatically triggered to open, eliminating human judgment errors and ensuring strict synchronization between alloy addition and steel output. Precise control of the initial addition amount avoids over- or under-addition. The 15-ton threshold and 80-ms duration form a baseline control parameter, providing a stable starting point for subsequent periodic operations, ensuring consistent alloy addition rhythm, and reducing the risk of component stratification.

[0052] In one embodiment of the present invention, the dynamic threshold includes a first threshold and a second threshold, wherein the first threshold is W0 / (90×4);

[0053] The second threshold is W0 / (130×4).

[0054] Furthermore, adjusting the flap cylinder action based on the comparison result of the weight change value X and the dynamic threshold includes:

[0055] When X > W0 / (90×4), control the flap cylinder to close for 80ms;

[0056] When X < W0 / (130×4), control the flap cylinder to open for 80ms.

[0057] In this embodiment, a threshold is calculated based on the initial weight W0 to ensure that the control logic is scientifically adapted to different alloy amounts. For example, when W0 = 1800 kg, the thresholds are 5 kg and 3.46 kg respectively. The dynamic comparison between the real-time weight change value X and the threshold ensures that the alloy addition rate is strictly matched with the steel output. When X > W0 / (90×4), the flap cylinder is closed for 80 ms to prevent over-addition; when X < W0 / (130×4), the flap cylinder is opened for 80 ms to replenish the insufficient amount. Through dynamic monitoring of the weight change value X, the system automatically identifies abnormal alloy melting rates and adjusts the cylinder actions in a timely manner, reducing the frequency of manual intervention.

[0058] In one embodiment of the present invention, the preset residual material threshold is 20 kg, and the duration of the final action is 15 seconds.

[0059] When the weight of the alloy in the alloy hopper is less than 20kg, control the flap cylinder to be fully open and hold for 15 seconds before closing.

[0060] In this embodiment, the final action is triggered when the weight of the alloy in the hopper drops to 20kg. Combined with the fully open state of the flap cylinder, 20kg of alloy can be emptied within 15 seconds, ensuring that the remaining alloy is completely added to the molten steel, avoiding residual accumulation. Furthermore, the amount of residual alloy is controlled to be less than 20kg, which can reduce the probability of valve and flap cylinder blockage.

[0061] In one embodiment of the present invention, the method further includes:

[0062] A pressure sensor is installed inside the permeable brick to monitor the gas pressure inside the permeable brick in real time.

[0063] When the pressure exceeds the preset safety threshold, an alarm is triggered and the addition of alloy is suspended. The safety threshold is 0.5 MPa to 1.0 MPa.

[0064] Once the pressure returns to normal, the alloy addition process will automatically restart.

[0065] In this embodiment, a high-precision pressure sensor is installed inside the permeable brick to collect gas pressure data in real time, enabling early warning of blockage. The preset safety threshold is 0.5MPa to 1.0MPa. When the pressure exceeds 1.0MPa, the system immediately stops the alloy hopper valve to prevent the addition of alloy under abnormal conditions, reducing compositional deviation. When the pressure returns to normal, the system automatically restarts the alloy addition process without manual intervention. These settings prevent damage to the permeable brick structure caused by high pressure.

[0066] In one embodiment of the present invention, the driving gas for the alloy hopper valve is propane.

[0067] In one embodiment of the present invention, the method constrains the minimum tapping time to 2.5 minutes;

[0068] If the actual tapping time is less than 2.5 minutes, the control system will proportionally compress the action interval cycle in the periodic control logic to ensure that the alloy is added before the tapping is completed.

[0069] In summary, after reading this invention document, those skilled in the art can make various other corresponding modifications to the technical solutions and concepts based on this invention without creative mental effort, and all of these modifications fall within the scope of protection of this invention.

Claims

1. A method for improving the alloying uniformity of steel tapped from a converter, characterized in that, Includes the following steps: Before tapping the steel, the amount of alloy is pre-configured into the alloy silo, and the initial weight W0 of the alloy baking furnace is obtained. During the steel tapping process, the amount of steel tapped is monitored in real time through a weighing system, and the data is transmitted to the control system. When the steel output reaches the preset trigger threshold, the control system starts the alloy silo valve for the first time and operates the valve opening and closing in a periodic control manner. The weight change value X inside the alloy baking furnace is calculated in real time, and the action of the tilting cylinder is adjusted according to the comparison result of the weight change value X and the dynamic threshold. When the remaining alloy weight in the hopper is lower than the preset remaining material threshold, the final action of the fully open flap cylinder is executed until the alloy is completely added.

2. The method for improving the alloying uniformity of converter steel according to claim 1, characterized in that, The real-time monitoring of steel output through the weighing system includes: real-time monitoring of steel output through the steel car weighing system.

3. The method for improving the alloying uniformity of converter steel according to claim 1, characterized in that, The periodic control logic includes: The valve's single opening duration is the predetermined opening duration; The interval between two consecutive valve opening actions is the predetermined operating cycle.

4. The method for improving the alloying uniformity of converter steel according to claim 3, characterized in that, The predetermined activation duration is 80ms, the predetermined action cycle is 250ms, and the interval between two adjacent activation actions is 170ms.

5. The method for improving the alloying uniformity of converter steel according to claim 4, characterized in that, The preset trigger threshold is 15 tons, and the duration of the first opening of the alloy silo valve is 80ms.

6. The method for improving the alloying uniformity of converter steel according to claim 5, characterized in that, The dynamic threshold includes a first threshold and a second threshold, wherein the first threshold is W0 / (90×4) and the second threshold is W0 / (130×4).

7. A method for improving the alloying uniformity of converter steel according to claim 6, characterized in that, The method of adjusting the flap cylinder action based on the comparison result of the weight change value X and the dynamic threshold includes: When X > W0 / (90×4), control the flap cylinder to close for 80ms; When X < W0 / (130×4), control the flap cylinder to open for 80ms.

8. The method for improving the alloying uniformity of converter steel according to claim 1, characterized in that, The preset residual material threshold is 20kg, and the duration of the final action is 15 seconds. When the weight of the alloy in the alloy hopper is less than 20kg, control the flap cylinder to be fully open and hold for 15 seconds before closing.

9. A method for improving the alloying uniformity of converter steel according to claim 1, characterized in that, The method further includes: A pressure sensor is installed inside the permeable brick to monitor the gas pressure inside the permeable brick in real time. When the pressure exceeds the preset safety threshold, an alarm is triggered and the addition of alloy is suspended. The safety threshold is 0.5 MPa to 1.0 MPa. Once the pressure returns to normal, the alloy addition process will automatically restart.

10. A method for improving the alloying uniformity of converter steel according to claim 1, characterized in that, The method restricts the minimum steel tapping time to 2.5 minutes; If the actual tapping time is less than 2.5 minutes, the control system will proportionally compress the action interval cycle in the periodic control logic to ensure that the alloy is added before the tapping is completed.

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