A low heat state coke smelting blast furnace tuyere parameter adaptation optimization method

Abstract

This invention belongs to the field of blast furnace ironmaking blast control technology, specifically disclosing a method for optimizing blast furnace tuyeres parameters during low-heat coke smelting. The method covers low-heat strength coke with CSR≤48% and M40≤87%, and includes the following steps: setting initial baseline tuyeres area, standard wind speed, and blast energy based on the characteristics of the blast furnace and low-heat coke; adjusting the tuyeres area, standard wind speed, and blast energy in conjunction with changes in key coke quality indicators; real-time control of the tuyeres area, standard wind speed, and blast energy based on online monitored furnace conditions; establishing a rapid emergency response mechanism for tuyeres parameters in case of abnormal furnace conditions; and coordinating tuyeres parameter adjustments with charging regime, thermal regime, slagging regime, and blast volume. This method achieves dynamic adaptation of blast furnace tuyeres parameters throughout the entire process during low-heat coke smelting, and can stably maintain the blast furnace vortex zone depth within a suitable range of 1.2m±0.1m.

Description

Technical Field

[0001] This invention relates to the field of blast furnace blast control technology, specifically to a method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting. Background Technology

[0002] The use of low-heat coke (CSR≤48%, M40≤87%) in blast furnaces is to cope with the shortage of high-quality coking coal and the need to reduce costs. Existing technologies for smelting low-heat coke mainly improve furnace conditions by optimizing charging, thermal regime, and slag formation regime, or by making static corrections to tuyeres parameters, and by passively reducing air volume and ore load to cope with fluctuations in operating conditions.

[0003] However, existing technologies lack a dynamic tuyer parameter adaptation mechanism for the characteristics of low-heat coke. The static and fixed tuyer parameters are seriously mismatched with the permeability of the coke column after deterioration and pulverization, which can easily lead to problems such as gas imbalance in the hearth, reduced smelting efficiency, frequent fluctuations in furnace conditions, and increased tuyer wear. It is impossible to solve the core contradiction of "reduced permeability - gas imbalance - deterioration of furnace conditions". Summary of the Invention

[0004] The purpose of this invention is to provide a method for optimizing the parameters of the blast furnace tuyeres during the smelting of low-heat coke, so as to solve the problem that the tuyeres parameters cannot be dynamically adapted to the fluctuations in coke quality, resulting in unbalanced airflow distribution, low smelting efficiency and frequent fluctuations in furnace conditions, ultimately preventing the blast furnace from achieving stable operation and efficient production.

[0005] To achieve the above objectives, the basic solution provided by this invention is: a method for optimizing blast furnace tuyeres parameters during the smelting of low-heat coke, including low-heat strength coke with CSR≤48% and M40≤87%, and further comprising the following methods: Baseline parameters are set: Based on the blast furnace condition and the characteristics of low-heat coke, the area of ​​a single tuyere is set to 0.3310 m². 2 -0.3328m 2 There are a total of 24 air vents, with a total vent area of ​​7.944m². 2 -7.987m 2 Standard wind speed: 250-260 m / s; Blower kinetic energy: 13000-14500 J / s; Dynamic adjustment: Establish a linkage adjustment mechanism between tuyere parameters and key indicators of low-heat coke, such as CSR, M40, and pulverization rate. Adjust the tuyere area, standard wind speed, and blast energy according to the measured coke indicators to maintain the depth of the blast furnace vortex zone at 1.2m ± 0.1m. Real-time control: The furnace condition data is obtained through the online monitoring system, and the tuyeres parameters are adjusted in real time based on the furnace hearth center temperature, permeability index, gas utilization rate, and furnace edge and center temperature indicators. Emergency Adjustment: Establish a rapid response mechanism for tuyere parameters and abnormal furnace conditions, and implement corresponding emergency adjustment strategies for tuyere parameters in response to abnormal operating conditions such as material suspension accidents, signs of furnace cooling, and slag buildup at tuyeres. Coordinated adaptation of operating procedures: The charging system, heating system, slagging system, and air volume coordination system of the blast furnace are adjusted in a coordinated manner with the tuyere parameters.

[0006] The working principle of this invention is as follows: This method targets the smelting conditions of low-heat coke with CSR≤48% and M40≤87%. First, it sets benchmark parameters for tuyeres area, wind velocity, and blast energy based on the blast furnace condition and the characteristics of low-heat coke, anchoring the appropriate depth of the blast furnace swirling zone. Then, it establishes a linkage adjustment mechanism between tuyeres parameters and key indicators of coke CSR, M40, and pulverization rate, dynamically correcting tuyeres parameters according to changes in coke performance to compensate for insufficient airflow penetration caused by the deterioration of low-heat coke and stabilize the depth of the swirling zone. Subsequently, it adjusts tuyeres parameters in real time through online monitoring data of the furnace condition to adapt to real-time changes in furnace temperature, permeability, and airflow distribution. A rapid emergency adjustment mechanism is set up for abnormal conditions such as hanging material, furnace cooling, and slag buildup at the tuyeres to promptly curb the deterioration of the furnace condition. Finally, it links the blast furnace charging, thermal regime, slagging regime, and blast volume regime to form a coordinated adaptation, achieving precise matching of tuyeres parameters with all conditions of low-heat coke smelting.

[0007] The beneficial effects of this invention are as follows: This method achieves dynamic adaptation of blast furnace tuyeres parameters throughout the entire process of blast furnace smelting of low-heat coke, and can stably maintain the depth of the blast furnace vortex zone within a suitable range of 1.2m ± 0.1m, effectively solving the problems of gas imbalance and poor furnace condition stability in blast furnace smelting of low-heat coke, reducing the occurrence of abnormal furnace conditions and tuyeres equipment wear; at the same time, through the linkage and matching of tuyeres parameters with real-time changes in coke quality and furnace conditions, it ensures the stable and smooth operation of blast furnace smelting, improves the adaptation and utilization efficiency of low-heat coke, and achieves efficient and low-consumption blast furnace smelting while reducing the cost of ironmaking raw materials.

[0008] Option 2, the preferred option of the basic scheme, sets the following baseline parameters: low-heat coke characteristics as CSR=45-48%, M40=85-87%, and Ad≤12.8%; suitable basic operating conditions are: ore load O / C 3.8-4.0, air volume 4800-4950 Nm³. 3 / min, furnace hearth center temperature ≥1450℃.

[0009] Option 3, the preferred option from the basic plan, has a specific linkage adjustment mechanism as follows: When the coke CSR < 47%, keep the duct area unchanged, increase the blower kinetic energy by 500-800 J / s, and increase the standard wind speed to 260-270 m / s; When coke M40 < 86%, the area of ​​a single tuyeres will be reduced by 0.0005m². 2-0.0010m 2 The total air vent area will decrease by 0.012-0.024m² accordingly. 2 The standard wind speed is increased to 265-275 m / s, and the kinetic energy of the blower is increased by 800-1000 J / s; When the pulverization rate of coke after entering the furnace is greater than 15%, the area of ​​a single tuyeres decreases by 0.0010m². 2 -0.0015m 2 The standard wind speed is increased to 270-280m / s, the blast energy is increased by 1000-1200J / s, and the ore load O / C is reduced by 0.1-0.2.

[0010] Option 4 is the preferred option among the basic options, and the specific real-time control rules are as follows: When the furnace hearth center temperature is <1450℃, keeping the tuyeres area unchanged, the blast kinetic energy increases by 500-600J / s, the standard wind speed increases by 5-10m / s, and the wind temperature increases by 20℃~30℃. When the air permeability index is < 4.2 kPa·min / Nm 3 At that time, the area of ​​a single air outlet decreased by 0.0005m². 2 The standard wind speed is increased to 265-270 m / s, the blower kinetic energy is increased by 700 J / s, and the air volume is reduced by 100-150 Nm³. 3 / min; When the gas utilization rate is less than 44%, the blast kinetic energy remains constant, and the area of ​​a single air outlet is reduced by 0.0003m². 2 -0.0005m 2 Standard wind speed increased by 5-8 m / s; When the edge temperature is greater than 150℃ and the center temperature is less than 450℃, the area of ​​a single air outlet decreases by 0.0005m². 2 The kinetic energy of the blower is increased by 600 J / s.

[0011] Option 5, the preferred option among the basic options, specifies the emergency adjustment rules for abnormal furnace conditions as follows: Handling of material suspension accidents: Reduce the kinetic energy of the blower by 1500-2000 J / s, reduce the standard wind speed to 240-250 m / s, and reduce the air volume by 300-400 Nm. 3 / min; Treatment for signs of furnace cooling: Keep the tuyeres area unchanged, increase the blast energy by 800-1000 J / s, increase the standard wind speed to 270-280 m / s, and add 2-3 batches of clean coke; Treatment of slag buildup at air vents: Increase the wind speed at the corresponding vent by 10-15 m / s, locally increasing the kinetic energy of the blower by 500 J / s. If this does not alleviate the problem, temporarily reduce the area of ​​the vent by 0.0005 m². 2 .

[0012] Option 6 is the preferred option among the basic options. The specific rules for operational system coordination and adaptation are as follows: The charging system adopts a "platform + funnel" feeding mode. The number of coke rings is set to C333222 and the number of ore rings is set to O3332. Here, C represents coke, which is distributed in 3, 3, 3, 2, 2, 2 rings at the six feeding angles to form a "uniform edge and thick center" distribution. O represents ore, which is distributed in 3, 3, 3, 2 rings at the four feeding angles to ensure smooth airflow in conjunction with coke. Heat treatment: control the molten iron temperature at 1490℃~1510℃, and the [Si] content at 0.3%-0.5%; Slag-forming regime: Binary basicity R2 is controlled at 1.10-1.15, and MgO content is controlled at 8.5%-9.5%. Detailed Implementation

[0013] The present invention will be further described in detail below through specific embodiments: Example A method for optimizing blast furnace tuyeres parameters during the smelting of low-heat coke, including low-heat strength coke with CSR≤48% and M40≤87%, also includes the following methods: Baseline parameters are set as follows: low-heat coke characteristics are CSR=45-48%, M40=85-87%, Ad≤12.8%; suitable basic operating conditions are: ore load O / C 3.8-4.0, air volume 4800-4950 Nm³. 3 / min, furnace hearth center temperature ≥1450℃; single tuyeres area set at 0.3310m² 2 -0.3328m 2 There are a total of 24 air vents, with a total vent area of ​​7.944m². 2 -7.987m 2 Standard wind speed: 250-260 m / s; Blower kinetic energy: 13000-14500 J / s; Dynamic adjustment: Establish a linkage adjustment mechanism between tuyeres parameters and key indicators of low-heat coke, such as CSR, M40, and pulverization rate. Adjust the tuyeres area, standard wind speed, and blast energy according to the measured coke indicators to maintain the blast furnace vortex zone depth at 1.2m ± 0.1m, as detailed below: When the coke CSR < 47%, keep the duct area unchanged, increase the blower kinetic energy by 500-800 J / s, and increase the standard wind speed to 260-270 m / s; When coke M40 < 86%, the area of ​​a single tuyeres will be reduced by 0.0005m². 2 -0.0010m 2 The total air vent area is reduced by 0.012m² accordingly. 2 -0.024m2 The standard wind speed is increased to 265-275 m / s, and the kinetic energy of the blower is increased by 800-1000 J / s; When the pulverization rate of coke after entering the furnace is greater than 15%, the area of ​​a single tuyeres decreases by 0.0010m². 2 -0.0015m 2 The standard wind speed is increased to 270-280 m / s, the blast kinetic energy is increased by 1000-1200 J / s, and the ore load O / C is reduced by 0.1-0.2. Real-time control: Furnace condition data is acquired through an online monitoring system. Based on hearth center temperature, permeability index, gas utilization rate, and furnace edge and center temperature indicators, the tuyere parameters are adjusted in real time, as follows: When the furnace hearth center temperature is <1450℃, keeping the tuyeres area unchanged, the blast kinetic energy increases by 500-600J / s, the standard wind speed increases by 5-10m / s, and the wind temperature increases by 20℃~30℃. When the air permeability index is < 4.2 kPa·min / Nm 3 At that time, the area of ​​a single air outlet decreased by 0.0005m². 2 The standard wind speed is increased to 265-270 m / s, the blower kinetic energy is increased by 700 J / s, and the air volume is reduced by 100-150 Nm³. 3 / min; When the gas utilization rate is less than 44%, the blast kinetic energy remains constant, and the area of ​​a single air outlet is reduced by 0.0003m². 2 -0.0005m 2 Standard wind speed increased by 5-8 m / s; When the edge temperature is greater than 150℃ and the center temperature is less than 450℃, the area of ​​a single air outlet decreases by 0.0005m². 2 The kinetic energy of the blower is increased by 600 J / s; Emergency Adjustment: Establish a rapid response mechanism for tuyere parameters and abnormal furnace conditions. For abnormal operating conditions such as suspended charge accidents, signs of furnace cooling, and slag buildup at the tuyere, implement corresponding emergency adjustment strategies for tuyere parameters, as detailed below: Handling of material suspension accidents: Reduce the kinetic energy of the blower by 1500-2000 J / s, reduce the standard wind speed to 240-250 m / s, and reduce the air volume by 300-400 Nm. 3 / min; Treatment for signs of furnace cooling: Keep the tuyeres area unchanged, increase the blast energy by 800-1000 J / s, increase the standard wind speed to 270-280 m / s, and add 2-3 batches of clean coke; Treatment of slag buildup at air vents: Increase the wind speed at the corresponding vent by 10-15 m / s, locally increasing the kinetic energy of the blower by 500 J / s. If this does not alleviate the problem, temporarily reduce the area of ​​the vent by 0.0005 m². 2 ; Coordinated Adaptation of Operating Procedures: The charging, heating, slagging, and blast rates of the blast furnace are adjusted in a coordinated manner with the tuyere parameters, as detailed below: Charging system: The "platform + hopper" feeding mode is adopted, with the number of coke rings set to C333222 and the number of ore rings set to O3332. Heat treatment: control the molten iron temperature at 1490℃~1510℃, and the [Si] content at 0.3%-0.5%; Slag-forming regime: Binary basicity R2 is controlled at 1.10-1.15, and MgO content is controlled at 8.5%-9.5%.

[0014] The implementation method of this embodiment is as follows: A batch of low-hot-strength coke was selected. The measured cold-state strength (M40) was 86.2%, the hot-state strength (CSR) was 46.5%, the ash content (Ad) was 12.5%, and the measured pulverization rate after entering the furnace was 13.8%. The effective volume of the blast furnace is 2500 m³. 3 It has 24 air vents, all of which are in operation with the air vents fully open.

[0015] Based on the characteristics of this coke, the furnace condition adaptation benchmark is set as follows: ore load O / C is 3.9, air volume is 4880 Nm³. 3 / min, target temperature at the center of the furnace hearth 1460℃; single tuyeres area selected as 0.3315m² 2 The total air vent area is 7.956m². 2 The standard wind speed is controlled at 255 m / s, and the blast energy benchmark is 13800 J / s. The charging system adopts a "platform + hopper" distribution pattern, with the number of coke rings set to C333222 and the number of ore rings set to O3332, forming a reasonable coke window distribution at the edge and center. In terms of thermal regime, the target temperature of molten iron is controlled at 1500℃, and the [Si] content is controlled at 0.4%. Regarding the slag formation regime, the binary basicity R2 is controlled at 1.15, and the MgO content is controlled at 9.0%.

[0016] After the furnace was started, coke samples were taken for pre-furnace testing. The results showed that the coke CSR was 46.5%, lower than the trigger condition of 47%. According to the linkage adjustment mechanism, the existing tuyeres area of ​​0.3315 m² was maintained. 2 Without changing the standard value, the blast kinetic energy was increased from the baseline of 13800 J / s to 14500 J / s, and the standard wind speed was simultaneously increased from 255 m / s to 265 m / s. This was done to enhance the penetration of the swirling zone, compensate for the weakening of the burden support due to insufficient hot coke strength, and stabilize the swirling zone depth at around 1.2 m. After the adjustment, the hearth center temperature was observed to be stable above 1460℃, and the slag-iron fluidity was good.

[0017] Four hours into the smelting process, the online monitoring system reported that the permeability index had decreased to 3.9 kPa·min / Nm³.3 The value is below the threshold of 4.2. Based on real-time control rules, the area of ​​a single air vent is adjusted from 0.3315m². 2 Shrink by 0.0005m 2 up to 0.3310m 2 The total air vent area is correspondingly increased from 7.956m². 2 Adjusted to 7.944m 2 The standard wind speed was further increased from 265 m / s to 268 m / s, the blower kinetic energy was increased by 700 J / s to 15200 J / s, and the air volume was increased from 4880 Nm³. 3 / min reduced to 4750Nm 3 / min, by narrowing the air outlet to increase the wind speed, enhance the penetration of the central airflow, and at the same time reduce the airflow appropriately to alleviate the resistance of the material column and prevent the pressure difference from continuing to rise.

[0018] As the smelting process entered the middle stage, the crosshair thermometer showed that the edge temperature rose to 162℃, while the center temperature dropped to 430℃, exhibiting a distribution characteristic of excessive temperature at the edge and weak temperature at the center. This triggered an adjustment condition where the edge temperature was greater than 150℃ and the center temperature was less than 450℃, further reducing the area of ​​each tuyeres by 0.0005m². 2 up to 0.3305m 2 The blast energy was increased by 600 J / s to 15800 J / s. By further narrowing the flow and increasing the energy, more air volume was directed to the center, suppressing the development at the edges, gradually pulling the center temperature back to above 460℃, and the edge temperature down to 138℃, making the gas flow distribution more reasonable.

[0019] During the same period, the gas utilization rate was monitored at 43.5%, which is lower than 44%. According to the rules, to maintain the same blast energy, the area of ​​each individual air outlet was further reduced by 0.0004m². 2 up to 0.3301m 2 The standard wind speed was increased by 6 m / s to 274 m / s to optimize airflow distribution and improve heat exchange efficiency between the gas and the furnace charge. After the adjustment, the gas utilization rate rebounded to 45.1%.

[0020] In the next phase of operation, analysis of coke samples taken from in front of the vents revealed that M40 had dropped to 85.5%, below the warning threshold of 86%. Based on the linkage mechanism, the area of ​​each individual vent was further reduced by 0.0008m². 2 up to 0.3293m 2 The total air vent area is 7.944m² 2 Reduced to 7.903m 2 The standard wind speed was increased to 275 m / s, and the blast energy was increased by 900 J / s to 16700 J / s to cope with the deterioration of air permeability caused by the degradation of coke particle size and the decrease in material column porosity, and to maintain a reasonable shape of the swirling zone.

[0021] During subsequent operation, the furnace hearth center temperature dropped to 1440℃. The control condition of the furnace hearth center temperature falling below 1450℃ was triggered. While maintaining the tuyeres area, the blast energy was increased by 550 J / s to 17250 J / s, and the standard wind speed was further increased by 8 m / s to 283 m / s. Simultaneously, the wind temperature was increased by 25℃ from the original setting to the corresponding level. After the adjustment, the furnace hearth center temperature gradually recovered and stabilized at around 1470℃, and the thermal condition of the furnace hearth was improved.

[0022] Towards the end of operation, slag buildup was observed at some tuyeres, determined to be caused by slag and iron adhesion in front of the tuyeres. Emergency measures were immediately implemented for these tuyeres, locally increasing the corresponding air velocity by 12 m / s and the blast energy by 500 J / s to enhance the scouring capacity of the swirling zone in front of the tuyeres. After 15 minutes of observation, the slag buildup was somewhat alleviated but not completely eliminated. The tuyer area was then temporarily reduced by 0.0005 m². 2 The wind speed at the vent was increased in a concentrated manner, and the original vent area was restored after the slag was removed. The entire process did not cause significant disturbance to the overall air volume distribution.

[0023] Throughout the smelting cycle, the slag-forming process was adjusted to maintain the binary basicity R2 at 1.15 and the MgO content at 9.0%, ensuring good slag fluidity and desulfurization capacity. This synergistic effect with tuyere parameter adjustments prevented slag phase fluctuations from interfering with the stability of the swirl zone. All adjustments were implemented in a coordinated manner, ensuring that tuyere parameters remained consistent with the actual state of low-heat coke and furnace conditions, thus achieving stable and smooth blast furnace operation under low-heat coke strength conditions.

[0024] 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 adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting, characterized in that, This includes low-heat-strength coke with CSR≤48% and M40≤87%, and also includes the following methods: Setting reference parameters: according to the blast furnace condition and low heat state coke characteristics, setting single tuyere area 0.3310-0.3328m 2 , total tuyere area 7.944m 2 -7.987m 2 ; standard wind speed 250-260m / s; blast dynamic energy 13000-14500J / s; Dynamic adjustment: Establish a linkage adjustment mechanism between tuyere parameters and key indicators of low-heat coke, such as CSR, M40, and pulverization rate. Adjust the tuyere area, standard wind speed, and blast energy according to the measured coke indicators to maintain the depth of the blast furnace vortex zone at 1.2m ± 0.1m. Real-time control: The furnace condition data is obtained through the online monitoring system, and the tuyeres parameters are adjusted in real time based on the furnace hearth center temperature, permeability index, gas utilization rate, and furnace edge and center temperature indicators. Emergency Adjustment: Establish a rapid response mechanism for tuyere parameters and abnormal furnace conditions, and implement corresponding emergency adjustment strategies for tuyere parameters in response to abnormal operating conditions such as material suspension accidents, signs of furnace cooling, and slag buildup at tuyeres. Coordinated adaptation of operating procedures: The charging system, heating system, slagging system, and air volume coordination system of the blast furnace are adjusted in a coordinated manner with the tuyere parameters.

2. The method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting according to claim 1, characterized in that, In the baseline parameters, the low-heat coke characteristics are CSR=45-48%, M40=85-87%, and Ad≤12.8%; the suitable basic operating conditions are: ore load O / C: 3.8-4.0, air volume 4800-4950 Nm³. 3 / min, furnace hearth center temperature ≥1450℃.

3. The method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting according to claim 1, characterized in that, The linkage adjustment mechanism is as follows: When the coke CSR < 47%, keep the duct area unchanged, increase the blower kinetic energy by 500-800 J / s, and increase the standard wind speed to 260-270 m / s; When coke M40 < 86%, the single tuyere area is reduced by 0.0005-0.0010 m 2 , the total tuyere area is correspondingly reduced by 0.012-0.024 m 2 , the standard wind speed is increased to 265-275 m / s, and the blast kinetic energy is increased by 800-1000 J / s; When the coke pulverization rate after entering the furnace is > 15%, the single tuyere area is reduced by 0.0010-0.0015 m 2 , the standard wind speed is increased to 270-280 m / s, the blast kinetic energy is increased by 1000-1200 J / s, and the ore load O / C0 is reduced by 0.1-0.

2.

4. The method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting according to claim 1, characterized in that, The specific rules for real-time control are as follows: When the furnace hearth center temperature is <1450℃, keeping the tuyeres area unchanged, the blast kinetic energy increases by 500-600J / s, the standard wind speed increases by 5-10m / s, and the wind temperature increases by 20-30℃. When the air permeability index < 4.2 kPa min / Nm 3 , the single tuyere area is reduced by 0.0005 m 2 , the standard wind speed is increased to 265-270 m / s, the blast kinetic energy is increased by 700 J / s, and the air volume is reduced by 100-150 Nm 3 / min; When the gas utilization rate is less than 44%, the blast kinetic energy remains constant, and the area of ​​a single air outlet is reduced by 0.0003-0.0005m². 2 Standard wind speed increased by 5-8 m / s; When the edge temperature is greater than 150℃ and the center temperature is less than 450℃, the area of ​​a single air outlet decreases by 0.0005m². 2 The kinetic energy of the blower is increased by 600 J / s.

5. The method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting according to claim 1, characterized in that, The specific emergency adjustment rules for abnormal furnace conditions are as follows: Handling of material suspension accidents: Reduce the kinetic energy of the blower by 1500-2000 J / s, reduce the standard wind speed to 240-250 m / s, and reduce the air volume by 300-400 Nm. 3 / min; Treatment for signs of furnace cooling: Keep the tuyeres area unchanged, increase the blast energy by 800-1000 J / s, increase the standard wind speed to 270-280 m / s, and add 2-3 batches of clean coke; Treatment of slag buildup at air vents: Increase the wind speed at the corresponding vent by 10-15 m / s, locally increasing the kinetic energy of the blower by 500 J / s. If this does not alleviate the problem, temporarily reduce the area of ​​the vent by 0.0005 m². 2 .

6. The method for adapting and optimizing blast furnace tuyeres parameters during low-heat coke smelting according to claim 1, characterized in that, The specific rules for operational system coordination and adaptation are as follows: The charging system adopts the "platform + hopper" feeding mode, with the number of coke rings set to C333222 and the number of ore rings set to O3332. Heat treatment: control the molten iron temperature at 1490℃~1510℃, and the [Si] content at 0.3%-0.5%; Slag-forming regime: Binary basicity R2 is controlled at 1.10-1.15, and MgO content is controlled at 8.5%-9.5%.