Method for balancing converter gun lifting frequency and electric dust remover explosion venting frequency

Abstract

The embodiment of the invention provides a method for balancing converter gun lifting times and electric dust remover explosion venting times. The method comprises the steps that gun lifting records and electric dust remover explosion venting records in the last work period are collected; according to the gun lifting record and the explosion venting record of the electric dust remover, a gun lifting strategy for the work period is generated, and the gun lifting strategy is used for determining a combustible gas content threshold value for triggering gun lifting operation; in the working period, real-time data of the content of combustible gas in the electric dust remover are obtained, and whether the gun lifting operation needs to be carried out or not is judged according to the real-time data and the gun lifting strategy; if yes, the gun lifting operation is executed. According to the technical scheme, the statistical data of the previous working period is used as guidance for automatic adjustment of the new working period, so that the gun lifting and explosion venting times are automatically determined, the situation that the production rhythm is affected due to too many gun lifting times can be avoided, and damage to equipment due to too much or large-power explosion venting cannot be generated; and the balance between the converter gun lifting frequency and the electric dust remover explosion venting frequency is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of steel manufacturing, and particularly to a method for determining lance lifting conditions in a dry dedusting blowing process, and more specifically, to a method for balancing the number of lance liftings in a converter and the number of explosion discharges in an electrostatic precipitator. Background Art

[0002] During the steelmaking process, there is a possibility of reaching the hydrogen-oxygen explosion limit and the carbon-oxygen explosion limit in dry dedusting. Once an explosion discharge occurs, it will lead to the interruption of production, and may cause damage to the dry dedusting equipment, and at the same time bring a series of safety hazards. Therefore, in the prior art, manual operations are often carried out to prevent explosion discharges, that is, based on the detection data of the concentration of combustible gases, it is judged whether there is a risk of explosion discharge in the current hydrogen-oxygen mixed concentration and carbon-oxygen mixed concentration. If so, the oxygen supply of the converter oxygen lance is interrupted to avoid the continuous increase of the oxygen concentration and avoid explosion discharge. This operation of interrupting the oxygen supply is also called lance lifting.

[0003] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0004] In the prior art, if the number of lance liftings is too large, it will lead to frequent interruption of production, seriously affecting the production rhythm. If the number of lance liftings is too small, it may lead to an increase in the number of explosion discharges, resulting in a decrease in safety. Therefore, how to balance safety and production, reasonably determine the lance lifting conditions, so as to minimize the number of lance liftings while avoiding explosion discharges as much as possible, and achieve a balance between the number of lance liftings and the number of explosion discharges is a problem to be solved. Summary of the Invention

[0005] The embodiments of the present invention provide a method for balancing the number of lance liftings in a converter and the number of explosion discharges in an electrostatic precipitator, so as to reasonably determine the lance lifting conditions, thereby minimizing the number of lance liftings while avoiding explosion discharges as much as possible, and achieving a balance between the number of lance liftings and the number of explosion discharges.

[0006] To achieve the above object, the embodiments of the present invention provide a method for balancing the number of lance liftings in a converter and the number of explosion discharges in an electrostatic precipitator, including: summarizing the lance lifting records and the explosion discharge records of the electrostatic precipitator in the previous working cycle; generating a lance lifting strategy for the current working cycle according to the lance lifting records and the explosion discharge records of the electrostatic precipitator, and the lance lifting strategy is used to determine the range of combustible gas content for triggering the lance lifting operation; in the current working cycle, obtaining the real-time data of the combustible gas content inside the electrostatic precipitator, and judging whether a lance lifting operation is required according to the real-time data and the lance lifting strategy; if so, performing the lance lifting operation.

[0007] Further, if the current working cycle is the first working cycle, a preset initial lance lifting strategy is used as the lance lifting strategy for this working cycle.

[0008] Further, the lance lifting records include the number of times of lance lifting when the hydrogen-oxygen content meets the standard and the number of times of lance lifting when the carbon-oxygen content meets the standard; the explosion relief records of the electrostatic precipitator include the number of times of hydrogen-oxygen explosion relief, the number of times of carbon-oxygen explosion relief, the number of explosion relief valves opened for hydrogen-oxygen explosion relief, the number of explosion relief valves opened for carbon-oxygen explosion relief, the number of explosion relief valves opened with limited position for hydrogen-oxygen explosion relief, and the number of explosion relief valves opened with limited position for carbon-oxygen explosion relief.

[0009] Further, according to the lance lifting records and the explosion relief records of the electrostatic precipitator, a lance lifting strategy for the current working cycle is generated, including: calculating the score value according to the lance lifting records and the explosion relief records of the electrostatic precipitator according to a preset scoring standard; generating a lance lifting strategy for the current working cycle according to the score value.

[0010] Further, the scoring standard specifically includes: setting an initial value of 0 points for the score value; adding 1 point for each time of lance lifting when the hydrogen-oxygen content meets the standard; adding 1 point for each time of lance lifting when the carbon-oxygen content meets the standard; subtracting 1 point for each time of hydrogen-oxygen explosion relief; subtracting 1 point for each time of carbon-oxygen explosion relief; subtracting 0.5 points for each explosion relief valve opened for hydrogen-oxygen explosion relief; subtracting 0.5 points for each explosion relief valve opened for carbon-oxygen explosion relief; subtracting 0.1 points for each explosion relief valve opened with limited position for hydrogen-oxygen explosion relief; subtracting 0.1 points for each explosion relief valve opened with limited position for carbon-oxygen explosion relief.

[0011] Further, generating a lance lifting strategy for the current working cycle according to the score value specifically includes: if the score value < 0, when the hydrogen concentration > 4% and the oxygen concentration > 2%, triggering the lance lifting operation; if the score value < 0, when the carbon monoxide concentration > 9% and the oxygen concentration > 7%, triggering the lance lifting operation; if 0 ≤ score value ≤ 5, when the hydrogen concentration > 5% and the oxygen concentration > 2%, triggering the lance lifting operation; if 0 ≤ score value ≤ 5, when the carbon monoxide concentration > 10% and the oxygen concentration > 8%, triggering the lance lifting operation; if the score value > 5, when the hydrogen concentration > 6% and the oxygen concentration > 2%, triggering the lance lifting operation; if the score value > 5, when the carbon monoxide concentration > 11% and the oxygen concentration > 9%, triggering the lance lifting operation.

[0012] Further, each working cycle is one week.

[0013] The above technical solution has the following beneficial effects:

[0014] In this technical solution, the statistical data of the previous working cycle is used as the guidance for automatic adjustment of the new working cycle, so as to automatically determine the number of lance liftings and explosion reliefs. It can not only avoid excessive lance liftings from affecting the production rhythm, but also control the generated explosion relief within a range with small harm and acceptable, achieving the balance between the number of lance liftings in the converter and the number of explosion reliefs of the electrostatic precipitator. Through actual measurement, on the premise that the harm of explosion relief is controllable, compared with the traditional method, the number of lance liftings can be reduced by about 90%, ensuring the production rhythm.

[0015] In addition, the technical solution also has the following features:

[0016] Since a complete method for determining the lance lifting strategy is set, the lance lifting operation no longer depends on the subjective judgment of the operator. Therefore, automatic interlocking lance lifting can be achieved, which works through the automatic judgment and correction of the program, making the result free from manual interference, improving the accuracy, and reducing the working intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a flowchart of a method for balancing the lance lifting times of a converter and the explosion venting times of an electrostatic precipitator according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the working principle of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] As Figure 1 shown, an embodiment of the present invention provides a method for balancing the lance lifting times of a converter and the explosion venting times of an electrostatic precipitator, including:

[0022] S101. Summarize the lance lifting records and the explosion venting records of the electrostatic precipitator in the previous working cycle;

[0023] S102. Generate a lance lifting strategy for the current working cycle according to the lance lifting records and the explosion venting records of the electrostatic precipitator, where the lance lifting strategy is used to determine the range of combustible gas content for triggering the lance lifting operation;

[0024] S103. In the current working cycle, obtain the real-time data of the combustible gas content inside the electrostatic precipitator, and judge whether a lance lifting operation is required according to the real-time data and the lance lifting strategy;

[0025] S104. If so, perform the lance lifting operation.

[0026] To solve the foregoing problems, in this application, instead of using the manual pre-judgment method for manual gun lifting operation, an automated operation mode is adopted. After setting the gun lifting strategy, when the production operation situation meets the gun lifting conditions (that is, the hydrogen-oxygen content reaches the standard or the carbon-oxygen content reaches the standard, and the standard means that the hydrogen-oxygen content and the carbon-oxygen content reach the preset values in the gun lifting strategy), the system automatically performs the gun lifting operation to ensure that the oxygen content will not continue to rise and avoid the occurrence of explosion venting.

[0027] Meanwhile, to achieve better results, in this application, the gun lifting strategy is not fixed but dynamically adjusted according to the previous operation situation. The statistical data of the previous working cycle is used as the guidance for automatically adjusting the parameters in this working cycle. The purpose is to automatically balance the number of gun liftings and explosion venting times in the gun lifting strategy, that is, to avoid the gun lifting operation being too frequent and affecting the production rhythm, and at the same time, to prevent more or more powerful explosion ventings from damaging the equipment, so as to achieve the balance between the number of gun liftings and the number of explosion ventings.

[0028] As Figure 2 shown, by continuously repeating the operation of evaluating and modifying the interlock gun lifting conditions, a relatively stable gun lifting strategy can be finally obtained to ensure the stable operation of production.

[0029] Furthermore, if the current working cycle is the first working cycle (i.e., the first application), since there is no prior data for reference, the preset initial gun lifting strategy (i.e., the basic preset gun lifting conditions in Figure 2 ) can be used as the gun lifting strategy for this working cycle.

[0030] Furthermore, the gun lifting record includes the number of gun liftings when the hydrogen-oxygen content reaches the standard and the number of gun liftings when the carbon-oxygen content reaches the standard;

[0031] The explosion venting record of the electrostatic precipitator includes the number of hydrogen-oxygen explosion ventings, the number of carbon-oxygen explosion ventings, the number of explosion venting valves opened for hydrogen-oxygen explosion venting, the number of explosion venting valves opened for carbon-oxygen explosion venting, the number of explosion venting valves with limited opening for hydrogen-oxygen explosion venting, and the number of explosion venting valves with limited opening for carbon-oxygen explosion venting.

[0032] Furthermore, to achieve objective and standardized operation and reduce the influence of subjective judgment, in this technical solution, it is preferably to adopt a scoring method to formulate the gun lifting strategy. At this time, step S102 includes:

[0033] S1021. According to the preset scoring standard, calculate the scoring value based on the gun lifting record and the explosion venting record of the electrostatic precipitator;

[0034] S1022. Generate the gun lifting strategy for the current working cycle according to the scoring value.

[0035] Furthermore, the specific scoring standard adopted in step S1021 is:

[0036] Set the initial value of the scoring score to 0 points;

[0037] Every time the hydrogen-oxygen content reaches the standard and the gun is lifted (that is, the gun-lifting operation is generated because the hydrogen-oxygen content reaches the trigger value specified in the gun-lifting strategy), the score increases by 1 point;

[0038] Every time the carbon-oxygen content reaches the standard and the gun is lifted (that is, the gun-lifting operation is generated because the carbon-oxygen content reaches the trigger value specified in the gun-lifting strategy), the score increases by 1 point;

[0039] Every time a hydrogen-oxygen explosion vent occurs, the score decreases by 1 point;

[0040] Every time a carbon-oxygen explosion vent occurs, the score decreases by 1 point;

[0041] Every time a hydrogen-oxygen explosion vent valve is opened, the score decreases by 0.5 points;

[0042] Every time a carbon-oxygen explosion vent valve is opened, the score decreases by 0.5 points;

[0043] Every time a hydrogen-oxygen explosion vent valve limit is opened, the score decreases by 0.1 points;

[0044] Every time a carbon-oxygen explosion vent valve limit is opened, the score decreases by 0.1 points.

[0045] It can be seen that the design idea of this scoring standard is to comprehensively calculate the final scoring score by accumulating the number of gun-lifting operations and explosion vent times in the previous cycle, and evaluating the explosion vent power (including the opening of the explosion vent valve and the opening of the explosion vent valve limit), assigning positive scores to gun-lifting operations and negative scores to explosion vents.

[0046] Further, the step S1022 specifically includes:

[0047] If the scoring score < 0, then when the hydrogen concentration > 4% and the oxygen concentration > 2%, trigger the gun-lifting operation;

[0048] If the scoring score < 0, then when the carbon monoxide concentration > 9% and the oxygen concentration > 7%, trigger the gun-lifting operation;

[0049] If 0 ≤ the scoring score ≤ 5, then when the hydrogen concentration > 5% and the oxygen concentration > 2%, trigger the gun-lifting operation;

[0050] If 0 ≤ the scoring score ≤ 5, then when the carbon monoxide concentration > 10% and the oxygen concentration > 8%, trigger the gun-lifting operation;

[0051] If the scoring score > 5, then when the hydrogen concentration > 6% and the oxygen concentration > 2%, trigger the gun-lifting operation;

[0052] If the score is greater than 5, the gun raising operation is triggered when the carbon monoxide concentration is greater than 11% and the oxygen concentration is greater than 9%.

[0053] The idea of ​​setting the gun raising strategy is that if the calculated score is low, it means that the number of gun raising times in the previous cycle is relatively small, while the number of explosion venting times is large and the explosion venting power is large, so it is judged that the gun raising strategy of the previous cycle is relatively radical. Therefore, in the new working cycle, the permissible range of the combustible gas (hydrogen-oxygen mixture, carbon monoxide-oxygen mixture) content can be set smaller, that is, the threshold for triggering the gun raising operation is set lower, so that the number of explosion venting times and the explosion venting power can be reduced in the new working cycle; on the contrary, if the calculated score is high, it means that the number of gun raising times in the previous cycle is relatively large, while the number of explosion venting times and the explosion venting power are small, so it is judged that the gun raising strategy of the previous cycle is relatively conservative. Therefore, in the new working cycle, the permissible range of the combustible gas content can be set larger, that is, the threshold for triggering the gun raising operation is appropriately increased, so that the number of gun raising times and the impact on production progress can be reduced in the new working cycle.

[0054] The above-mentioned combustible gas content setting value is based on data obtained by the inventor through long-term analysis and experiments, and can achieve better implementation effect.

[0055] A specific example of the present invention is as follows:

[0056] 1. Setting of gun adjustment parameters when hydrogen and oxygen concentration reaches the standard

[0057] For each automatic interlock and gun raising due to hydrogen and oxygen meeting the standards within a week, the assessment score will be increased by 1, and 1 point will be deducted for each hydrogen and oxygen explosion relief. For each hydrogen and oxygen explosion relief valve opened, 0.5 points will be deducted, and for each explosion relief valve limit opened, 0.1 points will be deducted.

[0058] ① If the final evaluation score is below 0, the hydrogen and oxygen automatic interlock gun lifting parameters are set as follows: interlock gun lifting when hydrogen concentration is greater than 4% and oxygen concentration is greater than 2%.

[0059] ② The final evaluation score is 0 to 5 points, and the hydrogen and oxygen automatic interlock gun lifting parameters are set as follows: interlock gun lifting when hydrogen concentration is greater than 5% and oxygen concentration is greater than 2%.

[0060] ③ If the final evaluation score is 5 points or above, the hydrogen and oxygen automatic interlock gun lifting parameters are set as follows: interlock gun lifting when hydrogen concentration is greater than 6% and oxygen concentration is greater than 2%.

[0061] 2. Setting of gun adjustment parameters when carbon and oxygen concentration reaches the standard

[0062] For each automatic interlock and gun raising due to carbon and oxygen meeting the standard within a week, the assessment score will be increased by 1, and for each carbon and oxygen explosion relief, 1 point will be deducted. For each carbon and oxygen explosion relief valve opened, 0.5 points will be deducted, and for each explosion relief valve limit opened, 0.1 points will be deducted.

[0063] ① When the final evaluation score is below 0, the parameters for the automatic carbon-oxygen interlock lance lifting are set as follows: when the carbon monoxide concentration > 9% and the oxygen concentration > 7%, the lance is lifted by interlock.

[0064] ② When the final evaluation score is 0 - 5, the parameters for the automatic carbon-oxygen interlock lance lifting are set as follows: when the carbon monoxide concentration > 10% and the oxygen concentration > 8%, the lance is lifted by interlock.

[0065] ③ When the final evaluation score is above 5, the parameters for the automatic carbon-oxygen interlock lance lifting are set as follows: when the carbon monoxide concentration > 11% and the oxygen concentration > 9%, the lance is lifted by interlock.

[0066] The two sets of programs can be put into use simultaneously, and the parameters are automatically calculated, judged, and adjusted once a week.

[0067] Furthermore, the length of each working cycle can be set according to actual needs, such as 3 days, one week, two weeks, one month, etc. In this technical solution, it is preferably set that each working cycle is one week.

[0068] In the above detailed description, various features are combined in a single embodiment to simplify the present disclosure. This method of disclosure should not be construed as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the appended claims, the present invention lies in a state with fewer features than all the features of the disclosed single embodiment. Therefore, the appended claims are hereby clearly incorporated into the detailed description, where each claim stands alone as a separate preferred embodiment of the present invention.

[0069] In order to enable any person skilled in the art to implement or use the present invention, the above-described disclosed embodiments have been described. For those skilled in the art, various modification methods of these embodiments are obvious, and the general principles defined herein can also be applied to other embodiments without departing from the spirit and protection scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0070] The above-described specific embodiments have further elaborated on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for balancing the number of converter gun lifting times and the number of electric precipitator explosion relief times, characterized in that: include: Summarize the gun lifting records and electrostatic precipitator explosion relief records in the previous work cycle; Generating a gun raising strategy for the current working cycle according to the gun raising record and the electrostatic precipitator explosion relief record, wherein the gun raising strategy is used to determine the combustible gas content range that triggers the gun raising operation; In the current working cycle, real-time data of the combustible gas content inside the electrostatic precipitator is obtained, and whether a gun lifting operation is required is determined according to the real-time data and the gun lifting strategy; If yes, then execute the gun raising operation.

2. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion relief times according to claim 1, characterized in that: If the current working cycle is the first working cycle, the preset initial gun raising strategy is used as the gun raising strategy for this working cycle.

3. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion venting times according to claim 1, characterized in that: The gun raising record includes the number of times the hydrogen and oxygen content reaches the standard and the number of times the carbon and oxygen content reaches the standard; The electrostatic precipitator explosion relief record includes the number of hydrogen-oxygen explosion reliefs, the number of carbon-oxygen explosion reliefs, the number of hydrogen-oxygen explosion relief valves opened, the number of carbon-oxygen explosion relief valves opened, the number of hydrogen-oxygen explosion relief valves limited opening, and the number of carbon-oxygen explosion relief valves limited opening.

4. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion relief times as claimed in claim 3, characterized in that: The generating a gun raising strategy for the current working cycle according to the gun raising record and the electrostatic precipitator explosion relief record includes: According to the preset scoring standard, the scoring value is calculated based on the gun raising record and the electrostatic precipitator explosion relief record; A gun raising strategy for the current work cycle is generated according to the scoring score.

5. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion venting times as claimed in claim 4, characterized in that: The scoring criteria specifically include: Set the initial value of the score to 0 points; Each time the hydrogen and oxygen content reaches the standard, the score will increase by 1 point; Each time the carbon and oxygen content reaches the standard, the score will increase by 1 point; Each time a hydrogen-oxygen explosion occurs, the score is reduced by 1 point; Each time a carbon oxygen explosion occurs, the score is reduced by 1 point; Each time a hydrogen-oxygen explosion relief valve is opened, the score is reduced by 0.5 points; Each time a carbon oxygen explosion relief valve is opened, the score is reduced by 0.5 points; Each time a hydrogen-oxygen explosion relief valve limit is opened, the score is reduced by 0.1 point; Each time a carbon-oxygen explosion relief valve limit is opened, the score is reduced by 0.1 point.

6. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion venting times as claimed in claim 5, characterized in that: The generating of the gun raising strategy for the current working cycle according to the scoring score specifically includes: If the score is less than 0, the gun raising operation is triggered when the hydrogen concentration is greater than 4% and the oxygen concentration is greater than 2%; If the score is less than 0, the gun raising operation is triggered when the carbon monoxide concentration is greater than 9% and the oxygen concentration is greater than 7%; If 0≤the score≤5, then when the hydrogen concentration is greater than 5% and the oxygen concentration is greater than 2%, the gun raising operation is triggered; If 0≤the score≤5, then when the carbon monoxide concentration is greater than 10% and the oxygen concentration is greater than 8%, the gun raising operation is triggered; If the score is greater than 5, the gun raising operation is triggered when the hydrogen concentration is greater than 6% and the oxygen concentration is greater than 2%; If the score is greater than 5, the gun raising operation is triggered when the carbon monoxide concentration is greater than 11% and the oxygen concentration is greater than 9%.

7. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion venting times as claimed in claim 1, characterized in that: Each work cycle is one week.

8. The method for balancing the number of converter gun lifting times and the number of electric precipitator explosion venting times as claimed in claim 7, characterized in that: Use AI to automatically update the gun-raising strategy for the current work cycle every week.

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