Regulation and control method for 2500 m < 3 > hydrogen-rich carbon circulating oxygen blast furnace convolution area

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a regulation and control method for a 2500 m < 3 > hydrogen-rich carbon circulation oxygen blast furnace rotation area. According to the method, accurate regulation and control of the HyCROF convolution area form and gas flow distribution are realized through five core steps of convolution area depth prediction and target setting, key parameter real-time monitoring, multi-parameter cooperative adjustment, abnormal working condition emergency processing and effect evaluation and iterative optimization. The specific parameter range is set for 2500m < 3 > HyCROF, an intelligent regulation and control system is established, the technical effects that the blast furnace stably and smoothly runs, the fuel ratio is reduced to be lower than 435kg / t, the utilization coefficient is increased to be higher than 2.42 t / (m < 3 >. D), and CO2 emission is reduced by more than 18% are finally achieved, the technical blank of regulation and control of a HyCROF process convolution area system is filled, and a key support is provided for commercialized popularization of a large-scale HyCROF technology.

Description

Technical Field

[0001] This invention relates to the field of blast furnace ironmaking technology, and in particular to a 2500m... 3 Methods for regulating the swirl zone of a hydrogen-rich carbon-cycle oxygen blast furnace. Background Technology

[0002] The swirl zone, as the core area for gas and heat generation in the lower part of the blast furnace, directly determines the blast furnace's smelting intensity, gas utilization rate, and energy consumption level through its morphological integrity and operational stability. It is a crucial control link in the blast furnace ironmaking process. In traditional blast furnace processes, swirl zone control is mainly achieved by adjusting conventional parameters such as blast volume, blast temperature, and oxygen enrichment rate. The relevant technologies have become relatively mature through long-term practice.

[0003] However, the hydrogen-rich carbon-recycled oxygen blast furnace (HyCROF), as a new generation of low-carbon ironmaking technology, uses high-temperature decarbonized gas and pure oxygen as the injection medium. It possesses significant process characteristics that distinguish it from traditional blast furnaces, such as all-oxygen smelting, gas recirculation, and hydrogen-rich injection, leading to fundamental changes in the formation mechanism, key influencing factors, and control logic of the swirling zone. Currently, research on the control of the swirling zone in HyCROF is still in the exploratory stage, lacking systematic and operable technical solutions and operational guidance.

[0004] Especially at 2500m 3 In large-scale HyCROF blast furnaces, the increased furnace volume and more complex reaction system significantly increase the difficulty of controlling parameters such as the depth and width of the vortex zone and the gas flow distribution. Improper control can easily lead to a series of problems, including inactive hearth, uneven gas distribution, increased fuel ratio, and higher production costs, severely hindering the stable operation and large-scale promotion of large-scale HyCROF technology. Therefore, developing a comprehensive vortex zone control method adapted to the characteristics of the HyCROF process has become a key technological requirement supporting the commercial application of large-scale technology. Summary of the Invention

[0005] The purpose of this invention is to provide a 2500m 3 The hydrogen-rich carbon-recycled oxygen blast furnace swirl zone control method achieves precise optimization of the swirl zone morphology and gas flow distribution through multi-parameter coordinated adjustment, combined with 2500m 3 Based on the actual production needs of large-scale HyCROF technology, a complete and implementable operating system and emergency plan should be developed to solve problems such as lack of control and poor stability in existing technologies, and achieve efficient, low-carbon and stable operation of large-scale HyCROF blast furnaces.

[0006] To achieve the above objectives, the basic solution provided by this invention is: a 2500m 3 The method for regulating the swirl zone of a hydrogen-rich carbon-circulating oxygen blast furnace includes the following steps: S1. Revolve Zone Depth Prediction and Target Setting: Calculate the theoretical depth Dr of the revolve zone based on current production parameters, targeting 2500m. 3 HyCROF sets the target depth range to 1.6~1.9m; S2. Real-time monitoring of key parameters: Real-time monitoring of gas velocity v at the air outlet. b The theoretical combustion temperature at the tuyeres (Tf), the blast kinetic energy (E), the gas composition in the swirling zone, and the hearth activity index (DMT), where v b The target range is 230~250m / s, the target range of Tf is 1900~2200℃, and the target range of E is 70000~90000J / s; S3. Multi-parameter coordinated adjustment: Based on the monitoring results of the swirling zone depth, theoretical combustion temperature and hearth activity index, the circulating gas flow rate, oxygen flow rate, tuyere diameter, gas heating temperature, pulverized coal injection rate and material distribution system are adjusted according to preset priorities. S4. Emergency handling of abnormal operating conditions: For abnormal operating conditions such as signs of material suspension, tuyeres damage, and severe gas segregation, implement the corresponding emergency response plan. S5. Effect evaluation and iterative optimization: For each shift, the fuel ratio, utilization coefficient and other indicators are statistically analyzed, and the parameter combination is optimized by combining the measured data of the turning zone depth.

[0007] Furthermore, the production parameters in step (1) include air volume, oxygen volume, coal volume, and gas composition.

[0008] Furthermore, the specific rules for multi-parameter coordinated adjustment in step (3) are as follows: (1) When Dr < 1.6m, adjust in the following order: ① Increase the circulating gas flow rate by ≤ 5%; ② Increase the oxygen flow rate and maintain the oxygen / gas ratio at 0.3~0.35; ③ Reduce the diameter of the tuyeres to increase the blast energy. (2) When Dr>1.9m, adjust in the following order: ① Reduce the circulating gas flow rate by ≤5%; ② Reduce the oxygen flow rate to maintain the oxygen / gas ratio at no less than 0.25; ③ Increase the diameter of the tuyeres to reduce the blast energy. (3) When Tf < 1900℃, ① increase the gas heating temperature to ≥ 1200℃; ② increase the oxygen flow rate; ③ reduce the CO2 content in the gas through the decarbonization system; (4) When DMT < 2200, ① increase the theoretical combustion temperature; ② increase the coal injection rate to ≥ 80 kg / t; ③ optimize the coal distribution system to develop the central airflow.

[0009] Furthermore, the specific plan for emergency handling of abnormal operating conditions in step (4) is as follows: (1) Suspension warning: When the pressure difference is >180kPa, immediately reduce the air volume by 30%~40%, stop oxygen, add 3 batches of clean coke, and gradually restore the air volume after the pressure difference returns; (2) Damaged air outlet: When the water temperature difference of the air outlet is abnormally increased, stop the air supply, replace the air outlet, adjust the blowing parameters and strengthen the cooling. (3) Severe segregation of gas distribution: By adjusting the material distribution matrix and changing the ore / coke distribution angle, the gas flow at the edge and center can be balanced.

[0010] Compared with the prior art, the advantages of this invention are: 1. This invention provides a systematic, complete, and operable method for controlling the HyCROF cyclone region, filling a gap in this technical field and solving the problem of the lack of targeted control schemes in the prior art.

[0011] 2. The method design is highly targeted, fully combining the process characteristics of HyCROF all-oxygen smelting, gas circulation, and hydrogen-rich injection with the 2500m... 3 The operation of large-scale blast furnaces requires high precision in control and strong adaptability.

[0012] 3. Through a multi-parameter coordinated adjustment strategy, the stability of the swirling zone and the gas utilization efficiency are significantly improved, effectively solving key technical problems such as the inactivity of the large HyCROF hearth and uneven gas distribution.

[0013] 4. In practical applications, it has achieved significant energy conservation, emission reduction, and efficiency improvement. Key indicators such as solid fuel ratio, utilization coefficient, and CO2 emissions have all reached advanced industry levels, reaching 2500m³. 3 HyCROF technology provides key technical support for commercial demonstration and large-scale promotion. Detailed Implementation

[0014] The present invention will be further described in detail below through specific embodiments: A 2500m 3 The method for regulating the swirl zone of a hydrogen-rich carbon-circulating oxygen blast furnace includes the following steps: S1. Revolve Zone Depth Prediction and Target Setting: Calculate the theoretical depth Dr of the revolve zone based on current production parameters, targeting 2500m. 3 HyCROF sets the target depth range to 1.6~1.9m; ​​production parameters include air volume, oxygen content, coal quantity, and gas composition. For detailed calculations, please refer to Table 1: Table 1. Relationship between production parameters and theoretical depth of the turning zone S2. Real-time monitoring of key parameters: Real-time monitoring of gas velocity v at the air outlet. bThe theoretical combustion temperature at the tuyeres (Tf), the blast kinetic energy (E), the gas composition in the swirling zone, and the hearth activity index (DMT), where v b The target range is 230~250m / s, the target range of Tf is 1900~2200℃, and the target range of E is 70000~90000J / s; S3. Multi-parameter coordinated adjustment: Based on the monitoring results of the swirling zone depth, theoretical combustion temperature, and hearth activity index, the circulating gas flow rate, oxygen flow rate, tuyeres diameter, gas heating temperature, pulverized coal injection rate, and material distribution system are adjusted according to preset priorities. The specific rules for multi-parameter coordinated adjustment are as follows: (1) When Dr < 1.6m, adjust in the following order: ① Increase the circulating gas flow rate by ≤ 5%; ② Increase the oxygen flow rate and maintain the oxygen / gas ratio at 0.3~0.35; ③ Reduce the diameter of the tuyeres to increase the blast energy. (2) When Dr>1.9m, adjust in the following order: ① Reduce the circulating gas flow rate by ≤5%; ② Reduce the oxygen flow rate to maintain the oxygen / gas ratio at no less than 0.25; ③ Increase the diameter of the tuyeres to reduce the blast energy. (3) When Tf < 1900℃, ① increase the gas heating temperature to ≥ 1200℃; ② increase the oxygen flow rate; ③ reduce the CO2 content in the gas through the decarbonization system; (4) When DMT < 2200, ① increase the theoretical combustion temperature; ② increase the coal injection rate to ≥ 80 kg / t; ③ optimize the coal distribution system to develop the central airflow.

[0015] S4. Emergency Handling of Abnormal Operating Conditions: For abnormal operating conditions such as signs of material suspension, tuyeres damage, and severe gas segregation, implement the corresponding emergency response plan; the specific emergency handling plan for abnormal operating conditions is as follows: (1) Suspension warning: When the pressure difference is >180kPa, immediately reduce the air volume by 30%~40%, stop oxygen, add 3 batches of clean coke, and gradually restore the air volume after the pressure difference returns; (2) Damaged air outlet: When the water temperature difference of the air outlet is abnormally increased, stop the air supply, replace the air outlet, adjust the blowing parameters and strengthen the cooling. (3) Severe segregation of gas distribution: By adjusting the material distribution matrix and changing the ore / coke distribution angle, the gas flow at the edge and center can be balanced.

[0016] S5. Effect evaluation and iterative optimization: For each shift, the fuel ratio, utilization coefficient and other indicators are statistically analyzed, and the parameter combination is optimized by combining the measured data of the turning zone depth.

[0017] Taking a certain steel company's 2500m 3 Taking the HyCROF blast furnace as the application object, the specific implementation steps of the above method are as follows: Initial state setting Initial operating parameters of the blast furnace: air volume 3800 Nm 3 / min, oxygen flow rate 58000 Nm 3 / h, circulating gas flow rate 200,000 Nm³ 3 The pulverized coal injection rate is 36.8 kg / t, and the tuyeres diameter is 0.100 m. Calculations show that the swirling zone depth is approximately 1.72 m, the theoretical combustion temperature is approximately 2000℃, and the blast kinetic energy is approximately 77462 J / s, which is basically within the target range.

[0018] Monitoring and Regulation Real-time monitoring revealed that the hearth activity index (DMT) was 2274, slightly lower than the preset target value of 2340, while other parameters were generally normal. Relevant operating parameters are shown in Table 2. Table 2 Comparison of Operating Parameters In response to the above situation, the following adjustment measures will be taken: (1) Increase the oxygen flow rate to 60000 Nm 3 / h, the circulating gas flow rate was slightly adjusted to 195,000 Nm³. 3 / h, maintain the oxygen / gas ratio within a reasonable range; (2) Gradually increase the coal injection rate to 50 kg / t and increase the number of coal guns to 30 to strengthen fuel supply; (3) Optimize the feeding system by adjusting the coke feeding angle from 39° to 38.5° and the ore feeding angle from 39.5° to 39°, focusing on developing the central airflow and improving the activity of the hearth.

[0019] Emergency Response During operation, a sudden increase in blast furnace differential pressure to 185 kPa was detected, triggering a material suspension warning. The following emergency measures were immediately implemented: (1) Reduce the overall air volume to 3400 Nm 3 / min, rapidly reducing airflow resistance inside the furnace; (2) Stop oxygen supply and add 3 batches of clean coke (5t each) to improve the permeability of the feed column; (3) Continuously monitor the pressure difference change. After 30 minutes, the pressure difference drops back to 165 kPa, and the overall air volume is gradually restored to 3800-4100 Nm³. 3 / min, to restore normal production rhythm.

[0020] Effect evaluation After the above adjustments and emergency measures, the blast furnace operating status improved significantly: the depth of the swirl zone stabilized at around 1.75m, within the target range of 1.6~1.9m; ​​the hearth activity index increased to 2320, close to the target value; the fuel ratio decreased from 435kg / t to 428kg / t; and the utilization coefficient remained stable at 2.42t / (m²). 3 •d) and above; gas utilization rate is significantly improved, CO2 emissions are reduced by more than 18%, the blast furnace operates smoothly and efficiently as a whole, and the expected control effect is achieved.

[0021] 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 2500m 3 The method for regulating the swirl zone of a hydrogen-rich carbon-recycled oxygen blast furnace is characterized by: Includes the following steps: S1. Revolve Zone Depth Prediction and Target Setting: Calculate the theoretical depth Dr of the revolve zone based on current production parameters, targeting 2500m. 3 HyCROF sets the target depth range to 1.6~1.9m; S2. Real-time monitoring of key parameters: Real-time monitoring of gas velocity v at the air outlet. b The theoretical combustion temperature at the tuyeres (Tf), the blast kinetic energy (E), the gas composition in the swirling zone, and the hearth activity index (DMT), where v b The target range is 230~250m / s, the target range of Tf is 1900~2200℃, and the target range of E is 70000~90000J / s; S3. Multi-parameter coordinated adjustment: Based on the monitoring results of the swirling zone depth, theoretical combustion temperature and hearth activity index, the circulating gas flow rate, oxygen flow rate, tuyere diameter, gas heating temperature, pulverized coal injection rate and material distribution system are adjusted according to preset priorities. S4. Emergency handling of abnormal operating conditions: For abnormal operating conditions such as signs of material suspension, tuyeres damage, and severe gas segregation, implement the corresponding emergency response plan. S5. Effect evaluation and iterative optimization: For each shift, the fuel ratio, utilization coefficient and other indicators are statistically analyzed, and the parameter combination is optimized by combining the measured data of the turning zone depth.

2. A 2500m according to claim 1 3 The method for regulating the swirl zone of a hydrogen-rich carbon-recycled oxygen blast furnace is characterized by: The production parameters in step (1) include air volume, oxygen content, coal quantity, and gas composition.

3. A 2500m according to claim 1 3 The method for regulating the swirl zone of a hydrogen-rich carbon-recycled oxygen blast furnace is characterized by: The specific rules for multi-parameter coordinated adjustment in step (3) are as follows: (1) When Dr < 1.6m, adjust in the following order: ① Increase the circulating gas flow rate by ≤ 5%; ② Increase the oxygen flow rate and maintain the oxygen / gas ratio at 0.3~0.35; ③ Reduce the diameter of the tuyeres to increase the blast energy. (2) When Dr>1.9m, adjust in the following order: ① Reduce the circulating gas flow rate by ≤5%; ② Reduce the oxygen flow rate to maintain the oxygen / gas ratio at no less than 0.25; ③ Increase the diameter of the tuyeres to reduce the blast energy. (3) When Tf < 1900℃, ① increase the gas heating temperature to ≥ 1200℃; ② increase the oxygen flow rate; ③ reduce the CO2 content in the gas through the decarbonization system; (4) When DMT < 2200, ① increase the theoretical combustion temperature; ② increase the coal injection rate to ≥ 80 kg / t; ③ optimize the coal distribution system to develop the central airflow.

4. A 2500m according to claim 1 3 The method for regulating the swirl zone of a hydrogen-rich carbon-recycled oxygen blast furnace is characterized by: The specific emergency response plan for abnormal operating conditions in step (4) is as follows: (1) Suspension warning: When the pressure difference is >180kPa, immediately reduce the air volume by 30%~40%, stop oxygen, add 3 batches of clean coke, and gradually restore the air volume after the pressure difference returns; (2) Damaged air outlet: When the water temperature difference of the air outlet is abnormally increased, stop the air supply, replace the air outlet, adjust the blowing parameters and strengthen the cooling. (3) Severe segregation of gas distribution: By adjusting the material distribution matrix and changing the ore / coke distribution angle, the gas flow at the edge and center can be balanced.

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