A quick diagnosis and disposal method for blast furnace pipeline stroke

Abstract

The present application belongs to the technical field of abnormal furnace condition disposal of blast furnace ironmaking, and specifically discloses a kind of quick diagnosis and disposal method of blast furnace pipeline stroke, first set standardization distribution, initial smelting parameters such as blast, stabilize the basic working condition in the furnace;High-frequency real-time acquisition of multiple blast furnace operation indexes, combined with quantitative threshold to build a pipeline stroke early warning mechanism, quickly identify abnormalities;According to the temperature distribution characteristics of the top of the furnace, the edge pipeline and the center pipeline are distinguished, and the differential measures such as distribution adjustment, air volume regulation, blast kinetic energy optimization and supplementary high-strength clean coke are used for disposal;After disposal, monitor the index change regularly, adjust as needed, and step by step, gently adjust each operation parameter after the working condition is stable.The present application solves the problem of lagging behind and single means of traditional monitoring and disposal method, can quickly and accurately eliminate pipeline abnormalities, avoid secondary fluctuations in furnace conditions, reduce yield loss and increase in coke ratio, and effectively improve the stability of blast furnace operation and smelting economic benefits.

Description

Technical Field

[0001] This invention relates to the field of blast furnace abnormality handling technology, specifically to a rapid diagnosis and handling method for blast furnace pipeline stroke. Background Technology

[0002] During blast furnace smelting, abnormal airflow conditions in pipelines are common, often caused by factors such as uneven distribution of gas flow, deterioration of the permeability of the charge column, and fluctuations in the quality of raw materials and fuels.

[0003] Existing pipeline handling technologies have significant drawbacks: diagnosis relies on manual experience, resulting in a strong lag, often only identifying the issue after the pipeline has formed (a sudden drop in gas utilization rate ≥3%, or a sudden increase or decrease in differential pressure), missing the optimal control window; handling methods are simplistic, often blindly reducing airflow or increasing coke volume, failing to target specific pipeline types (edge ​​pipelines, central pipelines) with precise measures, leading to a low success rate (≤60%); and handling can easily trigger secondary anomalies (such as suspended material, furnace cooling), creating a vicious cycle of pipeline → improper handling → furnace condition fluctuations. (2500m) 3 A single pipeline stroke in a blast furnace results in a production loss of 5-8% and an increase in coke ratio of 15-20 kg / t, necessitating a systematic method for rapid and accurate diagnosis and efficient handling. Summary of the Invention

[0004] The purpose of this invention is to provide a rapid diagnosis and treatment method for blast furnace pipeline stroke, so as to solve the problems of strong lag, single treatment method and thus large output loss and high coke ratio in existing pipeline stroke treatment methods.

[0005] To achieve the above objectives, the basic solution provided by this invention is: a method for rapid diagnosis and handling of blast furnace pipeline stroke, comprising the following steps: S1: Initial stage of smelting. The coke charging angle is set to 40°, 38°, 36°, 33.5°, 31°, and 26°, with a ring number of C333222. The furnace charge consists of 70% sinter, 22% pellets, and 8% lump ore. The charging angle of the furnace charge is consistent with that of the coke, with a ring number of O3332. The reference air volume is set to 4900–5000 Nm3 / min, the blast energy is 13500–14500 J / s, the air temperature is 1050–1080℃, and the oxygen enrichment is 2.2–2.5%. S2: The central control platform monitors blast furnace operation data in real time at a frequency of ≥1 time / minute. The blast furnace operation data includes cross temperature measurement data, gas utilization rate, pressure difference, air volume fluctuation, furnace top temperature distribution, permeability index, and furnace bottom molten iron temperature. The cross temperature measurement data includes the temperature of one side edge and the center temperature. At the same time, a pipeline travel warning threshold is set: a sudden increase of ≥50℃ in the temperature of one side edge or a sudden increase of ≥80℃ in the center temperature, a sudden increase of ≥50℃ in the furnace top temperature, a decrease of ≥2% in gas utilization rate within 10 minutes, a pressure difference fluctuation of ≥8kPa, and a sudden fluctuation of ≥5% in air volume. If any two of the above conditions are met, a pipeline travel warning is triggered. S3: After the pipeline travel warning is triggered, the pipeline travel rapid diagnosis is started. The specific method of pipeline travel rapid diagnosis is as follows: when the temperature of a single edge rises by ≥50℃ and the temperature of the furnace top on the corresponding side rises by ≥50℃, it is determined to be edge pipeline travel; when the temperature of the center rises by ≥50℃ and the gas utilization rate drops by ≥2% within 10 minutes, it is determined to be center pipeline travel. S4: When the diagnosis result of the pipeline stroke is the edge pipeline stroke, the specific handling method is as follows: adjust the corresponding side material distribution angle down by 1.5 to 2°, increase the number of coke rings on the corresponding side by 1 ring, decrease the number of ore rings on the corresponding side by 1 to 2 rings, reduce the air volume by 100 to 150 Nm3 / min, and add 1 to 2 batches of clean coke. When the diagnosis result for the pipeline travel is center pipeline travel, the specific handling methods are as follows: adjust the overall material distribution angle upward by 1°, reduce the number of turns of the coke center baffle by 1 to 2 turns, and reduce the air volume by 150 to 200 Nm. 3 / min, increase the blast energy by 500-800 J / s, and add 2 batches of clean coke; S5: After completing the pipeline operation, monitor the cross temperature measurement data and gas utilization rate every 10 minutes. If the recovery rate of both the cross temperature measurement data and gas utilization rate is ≥50% within 30 minutes, maintain the current handling parameters. If the recovery rate of both the cross temperature measurement data and gas utilization rate is <50% within 30 minutes, repeat the handling method in step S4, and increase the handling parameters by 50% from the original level. S6: When the duct symptoms are relieved, gradually reduce the air volume in increments of 50 Nm3 / min. After 2 hours, reduce the fabric parameters to 90% of the initial setting. At this point, the duct symptoms will disappear. S7: After the pipeline symptoms disappear and persist for 1 hour, restore the initial smelting parameters and monitor synchronously for 2 hours.

[0006] The principle and beneficial effects of this invention are as follows: By setting standardized material distribution and blast parameters in the early stages of smelting, the initial gas flow distribution is stabilized. During the smelting process, multi-dimensional operational data, including high-frequency cross temperature measurement, gas utilization rate, pressure difference, air volume fluctuation, furnace top temperature, permeability index, and furnace bottom molten iron temperature, are collected and combined with quantitative early warning thresholds to achieve early warning of pipeline travel. Furthermore, based on temperature distribution characteristics, edge and central pipeline types are quickly distinguished, and differentiated material distribution adjustments, air volume control, blast energy optimization, and enhanced coke replenishment are applied to address different pipeline anomalies. After treatment, the recovery effect is dynamically monitored, and operations are appropriately strengthened. Once symptoms subside, parameters are gradually adjusted back to ultimately restore stable smelting. This method can achieve rapid diagnosis of pipeline travel within 1 minute, increasing the success rate of treatment to over 90%, shortening recovery time by 60%, effectively avoiding secondary anomalies such as furnace cooling and suspended material, reducing capacity loss and coke ratio increases, and significantly improving blast furnace smooth operation index and smelting economy.

[0007] Option 2, an optimized version of the basic option, requires the following conditions for the furnace charge in step S1: iron content of sinter ≥ 56%, low-temperature reduction pulverization rate of sinter ≥ 65%, compressive strength of pellets ≥ 2500 N / piece, crush resistance of coke ≥ 87%, and post-high-temperature reaction strength of coke ≥ 48%. Strictly controlling the quality of the furnace charge at the initial stage of smelting ensures sufficient iron content and prevents pulverization at high temperatures. It also guarantees that the coke has sufficient crush resistance and provides adequate high-temperature structural support, effectively improving the overall uniformity and permeability of the charge column. This reduces gas flow deviation and charge column blockage caused by insufficient raw material strength, excessive powder, and high-temperature pulverization, fundamentally lowering the probability of pipeline malfunctions and providing reliable raw material support for the stable operation of the blast furnace.

[0008] Option 3, which is the preferred option of the basic option, involves step S3 where the pipeline travel is accompanied by a permeability index of <4.2 kPa·min / Nm. 3 In addition to performing the corresponding step S4, the batch weight of the furnace charge must be reduced by 5%. When the permeability index is below 4.2 kPa·min / Nm³... 3 This indicates that the blast furnace burden column has excessive air resistance and the gas flow is obstructed. In this case, in addition to the routine handling of the pipeline, reducing the batch weight of the burden by 5% can alleviate the downward pressure of the burden column, reduce the thickness of the burden layer, effectively reduce the air resistance between the burden columns, quickly improve the overall permeability of the blast furnace, prevent the gas flow from further converging and forming pipelines due to obstruction, and at the same time reduce the compression of the lower gas flow by the burden. Together with the pipeline handling measures, the gas flow distribution can be stabilized, the speed of eliminating abnormal operating conditions can be accelerated, the risk of repeated pipeline occurrences and burden suspension can be reduced, and the blast furnace can be quickly restored to normal operation.

[0009] Option 4, an optimal choice from the basic option, involves using high-strength coke in step S4. Its higher shatter resistance ensures that the coke is not easily broken or pulverized during transport, compression, and high temperatures within the blast furnace, thus forming a stable and solid material column skeleton. This effectively improves the permeability of the local material column, supports the material layer structure, and prevents further airflow deviation and pipe re-formation due to coke pulverization. Simultaneously, high-strength coke enhances the hearth heat reserve and airflow distribution stability, accelerates the elimination of pipe anomalies, reduces secondary risks such as furnace cooling and suspended material after treatment, and significantly improves the effectiveness of pipe flow treatment and blast furnace recovery efficiency.

[0010] Option 5, an optimal choice from the basic option, involves step S5. After the pipeline travel is processed, if the furnace bottom molten iron temperature is detected to be below 1470℃ and the silicon content below 0.3%, indicating signs of furnace cooling, the hearth heat can be quickly replenished by promptly increasing the blast temperature by 30-40℃, increasing the oxygen enrichment by 0.5%, and supplementing with 1-2 batches of clean coke. This strengthens the combustion and reducing atmosphere, enhances the hearth heat reserve, and effectively curbs the continuous decline in furnace temperature. At the same time, clean coke can enhance the role of the charge column skeleton, improve airflow distribution, and prevent secondary abnormalities such as charge column collapse, charge suspension, or pipeline recurrence caused by furnace cooling. This ensures that the furnace condition quickly returns to a stable hot state and guarantees the safe and smooth operation of blast furnace smelting.

[0011] Option 6, an optimized version of the basic option, involves step S6 where the temperature drop in the cross-shaped temperature measurement data is ≤20℃, the gas utilization rate recovers to above 44%, and the pressure difference stabilizes, indicating that the pipeline symptoms have eased. A stable temperature drop and controllable recovery in the cross-shaped temperature measurement indicate that the abnormally high-temperature airflow inside the furnace has been constrained, and the deviated airflow is gradually becoming more regular. A gas utilization rate recovering to above 44% indicates that the gas reduction utilization efficiency inside the furnace has returned to normal, and the airflow distribution is becoming more reasonable. A stable pressure difference indicates improved permeability of the feed column and stable ventilation resistance. Using multiple indicators to jointly determine the symptom easing of the pipeline avoids misjudgment based on a single parameter, achieving accurate assessment of the recovery status. A gradual parameter adjustment approach prevents excessive operational adjustments from causing repeated furnace condition fluctuations, ensuring a smooth transition of the blast furnace to normal smelting conditions and improving the stability and safety of pipeline handling.

[0012] Option 7, an optimal choice from the basic options, strictly controls the number of operating parameters adjusted simultaneously during the pipeline handling process to no more than three, and the single air volume adjustment range to no more than 5%. This avoids drastic fluctuations in the furnace airflow and thermal regime caused by simultaneous changes in multiple parameters, and prevents secondary anomalies such as pipeline weighting, material suspension, or furnace cooling caused by sudden imbalances in the gas flow distribution. Adjusting parameters in a small-amplitude, small-quantity, and gradual manner can maintain the thermal state of the hearth and the stability of the charge column, allowing the blast furnace to gradually adapt to operational changes. This ensures the handling effect while maximizing the stability and controllability of the smelting process, thereby improving the safety and success rate of anomaly handling. Detailed Implementation

[0013] The present invention will be further described in detail below through specific embodiments: A rapid diagnosis and handling method for blast furnace pipeline malfunctions includes the following steps: S1: Set initial smelting parameters: coke charging angles are 40°, 38°, 36°, 33.5°, 31°, and 26°, with a ring number of C333222. The furnace charge consists of 70% sinter, 22% Munkul pellets, and 8% vanadium-titanium lump ore. The charging angle of the furnace charge is consistent with that of the coke, with a ring number of O3332. The reference blast volume is 4950 Nm³. 3 / min, blast energy 14000J / s, wind temperature 1070℃, oxygen content 2.3%, smelting begins; S2: When smelting has been going on for 8 hours, the central control platform monitored that the temperature at the north edge suddenly rose from 110℃ to 165℃, the temperature at the north furnace top suddenly rose from 245℃ to 310℃, and the gas utilization rate dropped from 45.2% to 42.8% (a decrease of 2.4% within 10 minutes), triggering two warning thresholds. S3: Start Pipeline Stroke Quick Diagnosis: A sudden rise in temperature at the north edge and a sudden rise in temperature at the corresponding furnace top indicate a pipeline stroke at the north edge. S4: Implement edge pipeline treatment: Reduce the north side material placement angle from 40° and 38° to 38.5° and 36.5°, increase the number of coke rings on the north side by 1 (C333222 adjusted to C433222), decrease the number of ore rings on the north side by 1 (O3332 adjusted to O2332), and reduce the blower air volume by 120 Nm. 3 / min (4950Nm) 3 / min decreased to 4830Nm 3 / min), add 1 batch of clean coke (5 tons); S5: Monitoring 10 minutes after treatment: the temperature at the north edge dropped to 142℃, and the gas utilization rate rebounded to 43.6%; 30 minutes later: the edge temperature stabilized at 125℃, the gas utilization rate was 44.5%, and both the cross temperature measurement data and the gas utilization rate recovered to 60%; S6: with 50Nm 3 The air volume was gradually restored at a rate of / min, and after 2 hours the air volume recovered to 4950Nm. 3 / min, adjust the angle of the fabric on the north side back to 39°, 37°; S7: The indicators are completely stable (edge ​​temperature 115℃, gas utilization rate 45.3%, pressure difference stable), and there are no abnormalities after continuous monitoring for 2 hours. The initial smelting parameters are restored.

[0014] The implementation method of this embodiment is as follows: First, coke and furnace charge are fed in according to the set parameters. After dry quenching, the moisture content of the coke is ≤1.5%. The furnace charge is screened to remove powder ≤5mm, and the powder content is controlled to be ≤4.5%. During the smelting process, the central control platform is linked in real time with equipment such as cross temperature measuring instruments, pressure sensors, and gas composition analyzers to collect multi-dimensional data simultaneously.

[0015] When the temperature at the north edge, the furnace top temperature, and the gas utilization rate are detected to trigger the warning threshold, it is quickly determined that the north edge pipeline is traveling. Immediately implement the edge pipeline travel handling method: reconstruct the edge material column structure by lowering the corresponding side material distribution angle, adjusting the number of ore and coke rings, reducing the air volume to reduce airflow scouring, and adding clean coke to strengthen the material column support.

[0016] After the incident, the dynamic tracking indicators showed significant recovery within 30 minutes. The air volume and material distribution parameters were gradually restored to avoid excessive adjustments that could lead to secondary anomalies. The entire process, from triggering the warning to complete stabilization, took only 3 hours, 4 hours shorter than traditional methods. Production capacity loss was reduced to 1.2%, and the coke ratio increased by only 8 kg / t.

[0017] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for rapid diagnosis and handling of blast furnace pipeline malfunctions, characterized in that, Includes the following steps: S1: Initial smelting stage. The coke charging angles are set to 40°, 38°, 36°, 33.5°, 31°, and 26°, with a ring number of C333222. The furnace charge consists of 70% sinter, 22% pellets, and 8% lump ore. The charging angle is consistent with the coke charging angle, with a ring number of O3332. The baseline blast volume is set to 4900–5000 Nm³. 3 The blower's speed is 13500–14500 J / s, its kinetic energy is 1050–1080℃, and its oxygen content is 2.2–2.5%. S2: The central control platform monitors blast furnace operation data in real time at a frequency of ≥1 time / minute. The blast furnace operation data includes cross temperature measurement data, gas utilization rate, pressure difference, air volume fluctuation, furnace top temperature distribution, permeability index, and furnace bottom molten iron temperature. The cross temperature measurement data includes edge temperature and center temperature. At the same time, pipeline travel warning thresholds are set: a sudden increase in temperature at one edge ≥50℃ or a sudden increase in center temperature ≥80℃, a sudden increase in furnace top temperature ≥50℃, a decrease in gas utilization rate within 10 minutes ≥2%, pressure difference fluctuation ≥8kPa, and instantaneous air volume fluctuation ≥5%. If any two of the above conditions are met, a pipeline travel warning is triggered. S3: After the pipeline travel warning is triggered, the pipeline travel rapid diagnosis is started. The specific method of pipeline travel rapid diagnosis is as follows: when the temperature of a single edge rises by ≥50℃ and the temperature of the furnace top on the corresponding side rises by ≥50℃, it is determined to be edge pipeline travel; when the temperature of the center rises by ≥50℃ and the gas utilization rate drops by ≥2% within 10 minutes, it is determined to be center pipeline travel. S4: When the diagnosis result of the pipeline travel is edge pipeline travel, the specific handling method is as follows: reduce the corresponding side material distribution angle by 1.5-2°, increase the number of coke rings by 1 ring on the corresponding side, reduce the number of ore rings by 1-2 rings on the corresponding side, and reduce the air volume by 100-150 Nm. 3 / min, add 1-2 batches of clean coke; When the diagnosis result for the pipeline travel is center pipeline travel, the specific handling methods are as follows: adjust the overall material distribution angle upward by 1°, reduce the number of turns of the coke center baffle by 1 to 2 turns, and reduce the air volume by 150 to 200 Nm. 3 / min, increase the blast energy by 500-800 J / s, and add 2 batches of clean coke; S5: After completing the pipeline operation, monitor the cross temperature measurement data and gas utilization rate every 10 minutes. If the recovery rate of both the cross temperature measurement data and gas utilization rate is ≥50% within 30 minutes, maintain the current handling parameters. If the recovery rate of both the cross temperature measurement data and gas utilization rate is <50% within 30 minutes, repeat the handling method in step S4, and increase the handling parameters by 50% from the original level. S6: When the pipeline symptoms are relieved, at 50 Nm 3 The air volume was gradually adjusted back by a rate of / min, and after 2 hours the fabric parameters were adjusted back to 90% of the initial setting. At this point, the pipe symptoms disappeared. S7: After the pipeline symptoms disappear and persist for 1 hour, restore the initial smelting parameters and monitor synchronously for 2 hours.

2. The method for rapid diagnosis and handling of blast furnace pipeline stroke according to claim 1, characterized in that, The furnace charge in step S1 must meet the following requirements: iron content of sinter ≥ 56%, low-temperature reduction pulverization rate of sinter ≥ 65%, compressive strength of pellets ≥ 2500 N / piece, crushing strength of coke ≥ 87%, and high-temperature reaction strength of coke ≥ 48%.

3. The method for rapid diagnosis and handling of blast furnace pipeline stroke according to claim 1, characterized in that, In step S3, when the pipeline travel is accompanied by an air permeability index < 4.2 kPa·min / Nm 3 In addition to performing the corresponding step S4, the batch weight of the furnace charge also needs to be reduced by 5%.

4. The method for rapid diagnosis and handling of blast furnace pipeline stroke according to claim 1, characterized in that, In step S4, high-strength coke is used when adding clean coke.

5. The method for rapid diagnosis and handling of blast furnace pipeline stroke according to claim 1, characterized in that, In step S5, when the temperature of molten iron at the bottom of the furnace is <1470℃ and the Si content is <0.3% after the pipeline travel treatment, the blast temperature is immediately increased by 30-40℃, the oxygen enrichment is increased by 0.5%, and 1-2 batches of clean coke are added.

6. The method for rapid diagnosis and treatment of blast furnace pipeline stroke according to claim 1, characterized in that, In step S6, when the temperature drop of the cross temperature measurement data is ≤20℃, the gas utilization rate rises to above 44%, and the pressure difference stabilizes, it indicates that the pipeline symptoms have been relieved.

7. The method for rapid diagnosis and treatment of blast furnace pipeline stroke according to claim 1, characterized in that, During pipeline handling, the number of operating parameters adjusted simultaneously shall be ≤3, and the single air volume adjustment range shall be ≤5%.