CN109628670B - Air supply recovery method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000011084 recovery Methods 0.000 title claims abstract description 42
- 239000003034 coal gas Substances 0.000 claims abstract description 45
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000002708 enhancing effect Effects 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 239000000571 coke Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000036284 oxygen consumption Effects 0.000 claims description 4
- 230000005465 channeling Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses an air supply recovery method, which mainly aims at the quick recovery of an ultra-large blast furnace after air supply is stopped under the smelting conditions of heavy load (coke load is more than 5.50) and large coal ratio (coal ratio is more than 195 kg/t). The method aims to shorten the recovery time, avoid the yield loss caused by the fluctuation of the furnace condition and quickly reach the production with full wind by controlling and dredging the edge coal gas of the ultra-large blast furnace, enhancing the central coal gas opening of the ultra-large blast furnace, optimizing the air adding parameters in the air supply recovery process, controlling the air blowing and the material disorder, and performing the air blowing and air supply pressure stopping control on the ultra-large blast furnace. The method can effectively reduce the air supply recovery time of the ultra-large blast furnace, improve the production efficiency of the blast furnace and reduce the smelting cost. The method is suitable for being used on an ultra-large blast furnace for heavy-load smelting.
Description
Technical Field
The application relates to the technical field of blast furnace smelting, in particular to an air supply recovery method.
Background
The blast furnace needs to be periodically stopped for maintenance and necessary equipment maintenance, and needs to be recovered to a normal smelting state after the maintenance is finished. If the furnace condition is recovered smoothly, the recovery time can be shortened, the yield loss is reduced, the pig iron cost is reduced, furnace top equipment is protected, and the service life of the blast furnace is prolonged.
At present, much experience has been accumulated in the air supply recovery of the ultra-large blast furnace, but the air supply recovery of the ultra-large blast furnace under the condition of heavy load and large coal ratio smelting has large change of smelting parameters, still has the particularity, and has a unique place in the recovery process.
After the blast furnace stops blowing, the material column is gradually compacted from relative looseness, and the air permeability is reduced. Heavy load and large coal have relatively heavier edge load than under smelting conditions, and the gas permeability is deteriorated along with the increase of coke load, resulting in larger change of gas after air supply. The heavy-load smelting coal ratio reaches over 195kg/t, the edge develops, the edge temperature reaches 140-. And the air stopping process is carried out through coal stopping, the edge coal gas is automatically weighted due to low coal quantity and low coal ratio at the air supply initial stage, the edge temperature is reduced to be lower than 100 ℃, when the air quantity is increased to a certain degree, the edge passage is not smooth after the coal gas quantity of the hearth is increased, the pressure difference is increased under the condition that the center is not opened, the pressure difference is relatively higher under the condition of heavy-load smelting, the air is difficult to add after the pressure difference is increased, the coal gas is unstable, and the air flow or the pipeline is discharged, so that the coal gas is finally disordered. For an ultra-large blast furnace, once gas is abnormal, the recovery time of the blast furnace is greatly prolonged, the production rhythm of the whole company is seriously influenced, and huge economic loss is caused.
Disclosure of Invention
The invention provides an air supply recovery method, which aims to solve the technical problem of gas abnormality after air supply is stopped.
In order to solve the technical problems, the invention provides an air supply recovery method which is mainly used for air supply recovery of an ultra-large blast furnace when air is stopped under smelting conditions of heavy load and large coal ratio, wherein the effective volume of the ultra-large blast furnace is 4000m3The method has a heavy load of 5.50 or more of coke load and a large coal ratio of 195kg/t or more of coal ratio, and comprises:
in the process of air supply recovery after air supply is stopped, controlling and dredging edge coal gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of central coal gas of the ultra-large blast furnace;
controlling the air adding parameters of the ultra-large blast furnace;
performing air blowing and material disorder control on the ultra-large blast furnace;
and performing pressure stop control of air stop and air supply on the ultra-large blast furnace to ensure that the top pressure is matched with the gas quantity of the furnace bosh.
Preferably, before the controlling and channeling the edge gas of the ultra-large blast furnace and simultaneously enhancing the central gas opening of the ultra-large blast furnace, the method further includes:
controlling the furnace condition before stopping air to control the Si to be more than 0.3 percent and the temperature of the molten iron to be more than 1500 ℃.
Preferably, after the [ Si ] is controlled to be 0.3% or more and the temperature of molten iron is 1500 ℃ or more, the method further includes:
and (4) performing air-stopped material unloading according to the unloading time of 0.3-0.5 and ore shrinkage time of 5-10 t.
Preferably, before the controlling and dredging the edge gas of the ultra-large blast furnace and simultaneously enhancing the central gas opening of the ultra-large blast furnace, the method further comprises:
monitoring the edge temperature value of the coal gas in real time, and judging whether the edge temperature value is smaller than a preset temperature threshold value or not;
if so, indicating that the edge gas is too heavy, further controlling and dredging the edge gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of the central gas of the ultra-large blast furnace.
Preferably, the controlling of the air-adding parameters of the ultra-large blast furnace specifically includes:
performing oxygen control on the ultra-large blast furnace; or
Controlling the coal gas of the ultra-large blast furnace; or
And controlling the air quantity of the ultra-large blast furnace.
Preferably, the oxygen control of the ultra-large blast furnace specifically includes:
monitoring that the air volume of the ultra-large blast furnace is less than 70% of the full air level, and then forbidding oxygen utilization;
monitoring when the air quantity of the ultra-large blast furnace is in a preset range, controlling the oxygen consumption to be less than 10000m3/h；Wherein the preset range is 70% of the full wind level and 80% of the full wind level]。
Preferably, the coal gas control of the ultra-large blast furnace specifically comprises:
and monitoring that the air volume of the ultra-large blast furnace reaches 70% of the full air level, prohibiting air adding when the pressure difference is greater than 80% of the pressure difference in normal production, and timely performing air reduction control when the pressure fluctuation is monitored to be greater than 10% of the normal pressure.
Preferably, the air volume control of the ultra-large blast furnace specifically includes:
when the air quantity of the ultra-large blast furnace reaches 60% of the full air level, the air adding amplitude is less than or equal to 500m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 70% of the full air level, wherein the air adding amplitude is less than or equal to 300m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 80% of the full air level, wherein the air adding amplitude is less than or equal to 200m3Each time is/min, and the air adding interval is more than or equal to 15 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 95% of the full air level, wherein the air adding amplitude is less than or equal to 100m3The air adding interval is more than or equal to 15min per time.
Preferably, the controlling the air-adding parameter of the ultra-large blast furnace specifically further comprises:
and controlling the total air and total oxygen time of the ultra-large blast furnace to be half of the air stopping time.
Preferably, the air blowing and material disturbing control of the ultra-large blast furnace specifically comprises:
monitoring and controlling the airflow and heat of the ultra-large blast furnace in real time before the material is disorderly discharged to a reflow zone in a blowing-out deep stockline;
and controlling the pressure difference furnace to be constant and controlling the fluctuation range of the coal gas to be smaller than a preset fluctuation threshold value.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention discloses an air supply recovery method, which mainly aims at the quick recovery of an ultra-large blast furnace after air supply is stopped under the smelting conditions of heavy load (coke load is more than 5.50) and large coal ratio (coal ratio is more than 195 kg/t). The method aims to shorten the recovery time, avoid the yield loss caused by the fluctuation of the furnace condition and quickly reach the production with full wind by controlling and dredging the edge coal gas of the ultra-large blast furnace, enhancing the central coal gas opening of the ultra-large blast furnace, optimizing the air adding parameters in the air supply recovery process, controlling the air blowing and the material disorder, and performing the air blowing and air supply pressure stopping control on the ultra-large blast furnace. The method can effectively reduce the air supply recovery time of the ultra-large blast furnace, improve the production efficiency of the blast furnace and reduce the smelting cost. The method is suitable for being used on an ultra-large blast furnace for heavy-load smelting.
Drawings
Fig. 1 is a diagram of an implementation process of an air supply restoration method in an embodiment of the present invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
The invention discloses an air supply recovery method, which mainly aims at an ultra-large blast furnace (with the effective volume of 4000 m)3) After maintenance is carried out after air is shut down under the smelting conditions of heavy load (coke load is more than 5.50) and large coal ratio (coal ratio is more than 195kg/t), the key difficult problem in the air supply recovery process is solved, the blast furnace adjustment and operation method is comprehensively applied during air shut down and air supply, so that the blast furnace can achieve full air production as soon as possible, the furnace condition fluctuation is avoided, the recovery time can be effectively shortened, the production efficiency of the blast furnace is improved, and the smelting components are reduced.
Referring to fig. 1, a flow chart of an embodiment of the method for restoring the air supply according to the present invention is shown.
And 11, in the process of air supply recovery after air supply is stopped, controlling and dredging edge coal gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of central coal gas of the ultra-large blast furnace.
And in the process of air supply recovery after air supply is stopped, controlling and dredging edge coal gas of the ultra-large blast furnace, and controlling the furnace condition before air supply is stopped before the opening degree of central coal gas of the ultra-large blast furnace is enhanced, so that the [ Si ] is controlled to be more than 0.3 percent and the temperature of molten iron is more than 1500 ℃.
Furthermore, in the process of air supply recovery after air cut, the edge coal gas of the ultra-large blast furnace is controlled to be dredged, and before the opening degree of the central coal gas of the ultra-large blast furnace is enhanced, the air cut material is relieved according to the relief load of 0.3-0.5 and the ore shrinkage of 5-10 t.
Specifically, it is necessary to keep the smooth and stable state of the furnace condition before stopping the air, stabilize the full air level, and make the furnace temperature, and the [ Si ] is controlled to be above 0.3% and the molten iron temperature is above 1500 ℃. If the state is not reached, the load can be relieved to reach the reasonable range of the requirement in advance for 24 hours according to the actual furnace condition.
Furthermore, the air stopping material should be properly provided with a plurality of ore withdrawal batches and loads, so that the air supply can be quickly recovered. When the heavy load stops wind, the load is reduced as much as possible in order to recover quickly. The load withdrawal is mastered according to withdrawal of 0.3-0.5 and ore shrinkage of 5-10 t.
Further, in the process of air supply recovery after air supply is stopped, controlling and dredging edge coal gas of the ultra-large blast furnace, simultaneously monitoring the edge temperature value of the coal gas in real time before enhancing the central coal gas opening of the ultra-large blast furnace, and judging whether the edge temperature value is smaller than a preset temperature threshold value; if so, indicating that the edge gas is too heavy, further controlling and dredging the edge gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of the central gas of the ultra-large blast furnace.
Particularly, after air supply, the central and edge coal gas is timely dredged, and the distribution of the coal gas with more opened two ends is ensured. According to the actual process of blast furnace operation: in the initial stage of heavy-load large-coal-ratio air supply, the edge coal gas is too heavy (the edge temperature is less than 100 ℃), and the coal gas form changes greatly before air stop and after air supply, so that when air supply is recovered under the heavy-load smelting condition, the edge coal gas is timely dredged, meanwhile, the opening degree of the central coal gas is properly enhanced, two coal gas passages are ensured to be more open, and quick air supply recovery is facilitated. In addition, the oxygen supply time needs to be determined according to the change situation of the edge temperature, because the material speed after oxygen supply is fast, the edge is aggravated.
The gas in the center and the edge is dredged to increase a gas passage, the rhythm of air feeding, oxygen returning and load returning is controlled to stabilize the gas state, the relation of a material ruler and top pressure is controlled to stabilize the pressure, the blast furnace is enabled to recover the full-air state as soon as possible, and the fluctuation of the furnace condition in the recovery process is reduced.
And 12, controlling the air adding parameters of the ultra-large blast furnace.
In the specific implementation process, in the heavy load, high coal ratio stopping and air supply recovering process, especially under the condition of long-term air stopping, the air adding rhythm is well controlled, and the coal gas is supplied for a certain stabilization period. Controlling the air adding parameters of the ultra-large blast furnace specifically comprises the following steps: performing oxygen control on the ultra-large blast furnace; or controlling the coal gas of the ultra-large blast furnace; or the air volume of the ultra-large blast furnace is controlled.
The following description is made specifically.
And carrying out oxygen control on the ultra-large blast furnace, and specifically comprising the following steps: monitoring that the air volume of the ultra-large blast furnace is less than 70% of the full air level, and then forbidding oxygen utilization; monitoring when the air quantity of the ultra-large blast furnace is in a preset range, controlling the oxygen consumption to be less than 10000m3H; wherein the preset range is 70% of the full wind level and 80% of the full wind level]. Specifically, oxygen is strictly forbidden when the air quantity is less than 70% of the full air level, and the oxygen consumption is not more than 10000m within 80% of the full air level3And h, simultaneously paying attention to the stability of airflow and the heat control, and taking a response in the furnace after oxygen is used so as to prevent the phenomena of gas abnormality caused by the sudden large ascending of the furnace temperature, the non-opening of the gas, the occurrence of large pipelines and the like.
The coal gas control of the ultra-large blast furnace specifically comprises the following steps: when the air volume of the ultra-large blast furnace reaches 70% of the full air level and the differential pressure is greater than 80% of the differential pressure in normal production, air adding is prohibited; and when the pressure fluctuation is monitored to be greater than 10% of the normal pressure, timely wind reduction control is carried out. Specifically, when the air volume reaches 70% of the full air level, the pressure difference is controlled to be good in operation in a proper stabilization period of the coal gas, air is not added when the pressure difference is higher, and the coal gas cannot be damaged; when the pressure is unstable and the tip is broken, the wind needs to be reduced in time for control.
And controlling the air volume of the ultra-large blast furnace, which specifically comprises the following steps:
when the air quantity of the ultra-large blast furnace reaches 60% of the full air level, the air adding amplitude is less than or equal to 500m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 70% of the full air level, wherein the air adding amplitude is less than or equal to 300m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 80% of the full air level, wherein the air adding amplitude is less than or equal to 200m3Each time is/min, and the air adding interval is more than or equal to 15 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 95% of the full air level, wherein the air adding amplitude is less than or equal to 100m3The air adding interval is more than or equal to 15min per time.
Further, the total air and total oxygen time of the ultra-large blast furnace is controlled to be half of the air stopping time. That is, the full wind, full oxygen time is controlled at 1/2 of the wind stop time.
Furthermore, the offensive adjustment is stopped from the period from the previous period of stopping wind to the period of recovering the full wind, and the air flow fluctuation is avoided.
And step 13, performing air blowing and material mixing control on the ultra-large blast furnace.
In the specific implementation process, before the material is disorderly discharged to a reflow zone in a blowing-out deep stockline, the airflow and the heat of the ultra-large blast furnace are monitored and controlled in real time; and controlling the pressure difference furnace to be constant and controlling the fluctuation range of the coal gas to be smaller than a preset fluctuation threshold value. That is to say, stop wind deep stockline in disorder material and reach before the soft zone of melting pay attention to the air current steady and heat control, in operation with strict control pressure differential as the main, pressure unstability, timely subtract wind control when falling the tip, cross indiscriminate material period simultaneously and stop offensive adjustment, avoid taking place the coal gas undulant.
And step 14, performing pressure stop control on air stop and air supply of the ultra-large blast furnace to enable the top pressure to be matched with the gas volume of the furnace belly.
Further, after full wind, the charging is adjusted to the state before wind is stopped according to the actual furnace condition, and simultaneously the load is gradually recovered.
In the implementation process, the recovery time is shortened, the coke consumption is reduced, the yield loss caused by furnace condition fluctuation is avoided, and the full wind yield is quickly achieved by reducing the coke load of the air-stopping material, adjusting the air supply material charging and dredging the coal gas, and optimizing the air volume and pressure difference control in the air supply recovery process. The method can effectively reduce the air supply recovery time of the ultra-large blast furnace, improve the production efficiency of the blast furnace and reduce the smelting cost. The method is suitable for being used on an ultra-large blast furnace for heavy-load smelting.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention discloses an air supply recovery method, which mainly aims at the quick recovery of an ultra-large blast furnace after air supply is stopped under the smelting conditions of heavy load (coke load is more than 5.50) and large coal ratio (coal ratio is more than 195 kg/t). The method aims to shorten the recovery time, avoid the yield loss caused by the fluctuation of the furnace condition and quickly reach the production with full wind by controlling and dredging the edge coal gas of the ultra-large blast furnace, enhancing the central coal gas opening of the ultra-large blast furnace, optimizing the air adding parameters in the air supply recovery process, controlling the air blowing and the material disorder, and performing the air blowing and air supply pressure stopping control on the ultra-large blast furnace. The method can effectively reduce the air supply recovery time of the ultra-large blast furnace, improve the production efficiency of the blast furnace and reduce the smelting cost. The method is suitable for being used on an ultra-large blast furnace for heavy-load smelting.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. An air supply recovery method is used for air supply recovery of an ultra-large blast furnace when air is stopped under smelting conditions of heavy load and large coal ratio, and the effective volume of the ultra-large blast furnace is 4000m3The method is characterized in that the heavy load is coke load of more than 5.50, and the large coal ratio is coal ratio of more than 195kg/t, and the method comprises the following steps:
in the process of air supply recovery after air supply is stopped, controlling and dredging edge coal gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of central coal gas of the ultra-large blast furnace;
controlling the air adding parameters of the ultra-large blast furnace;
and performing air blowing and material disorder control on the ultra-large blast furnace, and specifically comprising the following steps: monitoring and controlling the airflow and heat of the ultra-large blast furnace in real time before the material is disorderly discharged to a reflow zone in a blowing-out deep stockline; controlling the pressure difference in the furnace to be constant and controlling the fluctuation amplitude of the coal gas to be smaller than a preset fluctuation threshold value;
and performing pressure stop control of air stop and air supply on the ultra-large blast furnace to ensure that the top pressure is matched with the gas quantity of the furnace bosh.
2. The method of claim 1, wherein prior to the controlling channeling the edge gas of the very large blast furnace while enhancing the center gas opening of the very large blast furnace, the method further comprises:
controlling the furnace condition before stopping air to control the Si to be more than 0.3 percent and the temperature of the molten iron to be more than 1500 ℃.
3. The method of claim 2, wherein after controlling [ Si ] to be 0.3% or more and controlling the molten iron temperature to be 1500 ℃ or more, the method further comprises:
and (4) performing air-stopped material unloading according to the unloading time of 0.3-0.5 and ore shrinkage time of 5-10 t.
4. The method of claim 1, wherein before controlling channeling edge gas of the very large blast furnace while enhancing a center gas opening of the very large blast furnace, the method further comprises:
monitoring the edge temperature value of the coal gas in real time, and judging whether the edge temperature value is smaller than a preset temperature threshold value or not;
if so, indicating that the edge gas is too heavy, further controlling and dredging the edge gas of the ultra-large blast furnace, and simultaneously enhancing the opening degree of the central gas of the ultra-large blast furnace.
5. The method of claim 1, wherein the controlling the windage parameters of the very large blast furnace specifically comprises:
performing oxygen control on the ultra-large blast furnace; or
Controlling the coal gas of the ultra-large blast furnace; or
And controlling the air quantity of the ultra-large blast furnace.
6. The method of claim 5, wherein the oxygen control of the very large blast furnace comprises:
monitoring that the air volume of the ultra-large blast furnace is less than 70% of the full air level, and then forbidding oxygen utilization;
monitoring when the air quantity of the ultra-large blast furnace is in a preset range, controlling the oxygen consumption to be less than 10000m3H; wherein the preset range is 70% of the full wind level and 80% of the full wind level]。
7. The method of claim 5, wherein the gas control of the ultra-large blast furnace specifically comprises:
when the air volume of the ultra-large blast furnace reaches 70% of the full air level and the differential pressure is greater than 80% of the differential pressure in normal production, air adding is prohibited;
and when the pressure fluctuation is monitored to be greater than 10% of the normal pressure, timely wind reduction control is carried out.
8. The method according to claim 5, wherein the air volume control of the ultra-large blast furnace specifically comprises:
when the air quantity of the ultra-large blast furnace reaches 60% of the full air level, the air adding amplitude is less than or equal to 500m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 70% of the full air level, wherein the air adding amplitude is less than or equal to 300m3Each time is/min, and the air adding interval is more than or equal to 20 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 80% of the full air level, wherein the air adding amplitude is less than or equal to 200m3Each time is/min, and the air adding interval is more than or equal to 15 min;
monitoring the air quantity of the ultra-large blast furnace to be more than 95% of the full air level, wherein the air adding amplitude is less than or equal to 100m3The air adding interval is more than or equal to 15min per time.
9. The method of claim 5, wherein the controlling the windage parameters of the very large blast furnace further comprises:
and controlling the total air and total oxygen time of the ultra-large blast furnace to be half of the air stopping time.
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