CN109628670A - Air supply recovery method - Google Patents
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- CN109628670A CN109628670A CN201811573210.4A CN201811573210A CN109628670A CN 109628670 A CN109628670 A CN 109628670A CN 201811573210 A CN201811573210 A CN 201811573210A CN 109628670 A CN109628670 A CN 109628670A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 34
- 239000003034 coal gas Substances 0.000 claims abstract description 65
- 239000003245 coal Substances 0.000 claims abstract description 28
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000002708 enhancing effect Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000000571 coke Substances 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 3
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims description 3
- 238000007664 blowing Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 3
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 241001417490 Sillaginidae Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000029052 metamorphosis Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (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
This application involves technical field of blast furnace process more particularly to a kind of air-supply restoration methods.
Background technique
Blast furnace needs regular blowing-out maintenance to carry out necessary plant maintenance, needs to restore after the completion of maintenance to smelt shape to normal
State.If furnace condition recovery smoothly if can shorten recovery time, reduce production loss, to reduce pig iron cost, protect furnace roof
Equipment extends the life of the blast furnace.
Currently, the air-supply of ultra-large type blast furnace restores to have had accumulated many experiences, but for being smelted in the big coal ratio of heavy load
Under the conditions of the air-supply of ultra-large type blast furnace restore, smelting parameter changes greatly, still has its particularity, and recovery process has its unique
Place.
Stock column is gradually compacted by of a relatively loose after blast furnace blowing-out, and gas permeability reduces.Heavy load, big coal are more following than smelting condition
Edge load is relatively heavy, is deteriorated as coke load increases gas permeability, coal gas after air-supply is caused to change greatly.Heavy load smelts coal
Than being up to 195kg/t or more, margin development, lip temperature reaches 140-150 DEG C, and prolonged high-coal ratio smelting brings edge coal
The further development of gas.And blowing-out process, after coal is stopped, the low coal amount at initial stage of blowing, low coal ratio make edge coal gas automatic weight increasing,
Lip temperature is down to 100 DEG C hereinafter, when air quantity is added to a certain degree, and cupola well gas volume increase back edge access is unsmooth, at center
Pressure difference increases in the case where not opening, and pressure difference is relatively high under heavy load smelting condition in addition, and after pressure difference increases plus wind is difficult, causes
Coal gas is unstable, and air-flow or pipeline, it is not normal to eventually lead to coal gas out.It, will substantially once coal gas is not normal for ultra-large type blast furnace
Extend blast furnace recovery time, seriously affects the rhythm of production of entire company, cause huge economic loss.
Summary of the invention
Invention provides a kind of air-supply restoration methods, to solve the technical problem for causing coal gas not normal after blowing-out.
In order to solve the above technical problems, being mainly used for ultra-large type blast furnace the present invention provides a kind of air-supply restoration methods and existing
Air-supply under the smelting condition of the big coal ratio of heavy load when blowing-out restores, and the ultra-large type blast furnace is dischargeable capacity 4000m3More than,
Heavy load is 5.50 or more coke load, and big coal ratio is coal ratio 195kg/t or more, which comprises
During carrying out air-supply recovery after blowing-out, the edge coal gas of the ultra-large type blast furnace is dredged in control, is increased simultaneously
The center coal gas aperture of the strong ultra-large type blast furnace；
Control the ultra-large type blast furnace adds wind parameter；
Blowing-out disorderly material control is carried out to the ultra-large type blast furnace；
To the ultra-large type blast furnace carry out blowing-out, air-supply stop voltage-controlled system so that press to match with bosh tolerance.
Preferably, the edge coal gas of the ultra-large type blast furnace is dredged in the control, while enhances the ultra-large type blast furnace
Center coal gas aperture before, the method also includes:
The working of a furnace is controlled before blowing-out, makes [Si] control 0.3% or more, 1500 DEG C of molten iron temperature or more.
Preferably, described to make [Si] control after 0.3% or more, 1500 DEG C of molten iron temperature or more, the method is also wrapped
It includes:
According to load 0.3-0.5 is moved back, contracting mine batch 5-10t moves back load to carry out blowing-out material.
Preferably, described to control the edge coal gas for dredging the ultra-large type blast furnace, while enhancing the ultra-large type blast furnace
Before the coal gas aperture of center, the method also includes:
The lip temperature value of real-time monitoring coal gas, judges whether the lip temperature value is less than preset temperature threshold；
If so, indicating that the edge coal gas is overweight, and then the edge coal gas for dredging the ultra-large type blast furnace is controlled, simultaneously
Enhance the center coal gas aperture of the ultra-large type blast furnace.
Preferably, the control ultra-large type blast furnace plus wind parameter, specifically include:
Oxygen control is carried out to the ultra-large type blast furnace；Or
Coal gas control is carried out to the ultra-large type blast furnace；Or
Boiler pressure control is carried out to the ultra-large type blast furnace.
Preferably, described that Oxygen control is carried out to the ultra-large type blast furnace, it specifically includes:
The air quantity for monitoring the ultra-large type blast furnace is less than horizontal 70% of full blast, then forbids using oxygen；
When monitoring the air quantity of the ultra-large type blast furnace and being in preset range, control flow of oxygen is less than 10000m3/h；Its
In, the preset range is [the 70% of full blast level, the 80% of full blast level].
Preferably, described that coal gas control is carried out to the ultra-large type blast furnace, it specifically includes:
The air quantity for monitoring the ultra-large type blast furnace reaches horizontal 70% of full blast, and pressure difference is greater than pressure difference during normal production
Forbid adding wind when 80%, monitors timely checking control when pressure oscillation is greater than normal pressure 10%.
Preferably, described that Boiler pressure control is carried out to the ultra-large type blast furnace, it specifically includes:
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 60% of full blast, wind amplitude is added to be less than or equal to 500m3/
Min/ times, wind interval is added to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 70% or more of full blast, wind amplitude is added to be less than or equal to
300m3/ min/ times, add wind interval to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 80% or more of full blast, wind amplitude is added to be less than or equal to
200m3/ min/ times, add wind interval to be more than or equal to 15min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 95% or more of full blast, wind amplitude is added to be less than or equal to
100m3/ min/ times, add wind interval to be more than or equal to 15min.
Preferably, the control ultra-large type blast furnace plus wind parameter, specifically further include:
The full blast total oxygen time for controlling the ultra-large type blast furnace is the half of blowing-out time.
Preferably, described that blowing-out disorderly material control is carried out to the ultra-large type blast furnace, it specifically includes:
Before reaching cohesive zone under blowing-out depth stockline disorderly material, the air-flow and heat of real-time monitoring and the control ultra-large type blast furnace
Degree；
It controls constant in pressure difference furnace and control coal gas fluctuating range and is less than default fluctuation threshold.
One or more technical solution through the invention, the invention has the advantages that advantage:
The invention discloses a kind of air-supply restoration methods, and being primarily directed to ultra-large type blast furnace, (coke is negative in heavy load
Lotus is greater than the fast quick-recovery of the working of a furnace 5.50), under big coal ratio (coal ratio is higher than 195kg/t) smelting condition after blowing-out.This method is intended to
The edge coal gas of the ultra-large type blast furnace is dredged by controlling, while enhancing the center coal gas aperture of the ultra-large type blast furnace, it is excellent
Change air-supply recovery process in plus wind parameter, control blowing-out disorderly expect, and to ultra-large type blast furnace carry out blowing-out, air-supply stop it is voltage-controlled
It makes, to shorten recovery time, production loss caused by avoiding the working of a furnace from fluctuating and quickly full blast, which reach, to be produced.This method can be effectively reduced
The air-supply recovery time of ultra-large type blast furnace improves blast fumance efficiency, reduces smelting cost.This method is suitble to smelt in heavy load
Ultra-large type blast furnace on use.
Detailed description of the invention
Fig. 1 is a kind of implementation process figure for restoration methods of blowing in the embodiment of the present invention.
Specific embodiment
In order to make the application the technical staff in the technical field be more clearly understood that the application, with reference to the accompanying drawing,
Technical scheme is described in detail by specific embodiment.
The invention discloses a kind of air-supply restoration methods, are primarily directed to ultra-large type blast furnace (dischargeable capacity 4000m3)
After being overhauled after blowing-out under heavy load (coke load is greater than 5.50), big coal ratio (coal ratio is higher than 195kg/t) smelting condition, blow extensive
Priority and difficulty problem during multiple, the adjustment of integrated application blast furnace and operating method in blowing-out and air-supply, so that blast furnace is as early as possible
Full blast avoids the working of a furnace from fluctuating, can effectively shorten recovery time up to producing, and improves blast fumance efficiency, reduces and smelts ingredient.
It is the specific implementation process figure of air-supply restoration methods of the invention referring now to Fig. 1.
Step 11, during air-supply recovery is carried out after blowing-out, the edge coal gas of the ultra-large type blast furnace is dredged in control,
Enhance the center coal gas aperture of the ultra-large type blast furnace simultaneously.
During carrying out air-supply recovery after blowing-out, the edge coal gas of the ultra-large type blast furnace is dredged in control, is increased simultaneously
Before the center coal gas aperture of the strong ultra-large type blast furnace, the working of a furnace is controlled before blowing-out, makes [Si] control 0.3% or more, iron
1500 DEG C of coolant-temperature gage or more.
Further, during air-supply recovery is carried out after blowing-out, the edge coal of the ultra-large type blast furnace is dredged in control
Gas, while before enhancing the center coal gas aperture of the ultra-large type blast furnace is needed according to moving back load 0.3-0.5, contracting mine batch 5-10t
Load is moved back to carry out blowing-out material.
In particular it is necessary to get hold of the stability state of the working of a furnace before blowing-out, stablizes full blast level, carries out furnace temperature,
[Si] is controlled 0.3% or more, 1500 DEG C of molten iron temperature or more.If above-mentioned state is not achieved, can shift to an earlier date according to the working of a furnace is practical
The zone of reasonableness of requirement can be reached by moving back within 24 hours load extremely.
Further, blowing-out material suitably should move back mine batch and load more, the fast quick-recovery after being conducive to air-supply in this way.Heavy load
It is as far as possible in terms of load to move back in order to fast quick-recovery when blowing-out more.It moves back load and criticizes 5-10t according to 0.3-0.5, contracting mine is moved back to slap
It holds.
Further, during air-supply recovery is carried out after blowing-out, the edge coal of the ultra-large type blast furnace is dredged in control
Gas, while before enhancing the center coal gas aperture of the ultra-large type blast furnace, the lip temperature value of real-time monitoring coal gas, described in judgement
Whether lip temperature value is less than preset temperature threshold；If so, indicating that the edge coal gas is overweight, and then controls and dredge described surpass
The edge coal gas of large blast furnace, while enhancing the center coal gas aperture of the ultra-large type blast furnace.
Specifically, center and peripheral coal gas is dredged after air-supply in time, guarantees the gas flow distribution that both ends are more increased.According to height
Furnace operates real process: in the big coal of heavy load than air-supply initial stage, edge coal gas is overweight (lip temperature is less than 100 DEG C), before blowing-out
It is very big with coal gas metamorphosis after air-supply, therefore it is same that edge coal gas is dredged in time when air-supply recovery under heavy load smelting condition
When suitably enhance center coal gas aperture, to guarantee the more open of two coal gas accesses, be conducive to quick windward and restore.In addition root is needed
According to lip temperature situation of change, oxygen supply opportunity is determined, because edge can aggravate to expecting that speed becomes faster after oxygen.
Center and peripheral coal gas is dredged to increase coal gas access, control plus wind return oxygen and returns load rhythm to stablize coal gas
State can control material ruler and press to stablize and press magnitude relation, so that blast furnace is restored full blast state as early as possible, reduce in recovery process
Working of a furnace fluctuation.
Step 12, control the ultra-large type blast furnace adds wind parameter.
In the specific implementation process, stop, in recovery process of blowing in heavy load, big coal ratio, especially long-term blowing-out
In the case of, it to control and add wind rhythm, to coal gas certain stationary phase.Control the ultra-large type blast furnace adds wind parameter, specifically
It include: that Oxygen control is carried out to the ultra-large type blast furnace；Or coal gas control is carried out to the ultra-large type blast furnace；Or to the super large
Type blast furnace carries out Boiler pressure control.
It is specifically introduced below.
Carry out Oxygen control to the ultra-large type blast furnace, specifically include: the air quantity for monitoring the ultra-large type blast furnace is less than entirely
The 70% of wind levels is then forbidden using oxygen；When monitoring the air quantity of the ultra-large type blast furnace and being in preset range, control flow of oxygen is small
In 10000m3/h；Wherein, the preset range is [the 70% of full blast level, the 80% of full blast level].Specifically, air quantity
Not up to full blast it is horizontal 70% when forbid with oxygen, reach full blast it is horizontal 80% within flow of oxygen must not exceed 10000m3/
H, while paying attention to steady air current and temperature control, with to carry out reply in furnace after oxygen, to prevent the unexpected substantially uplink of furnace temperature,
Caused coal gas can't get away, and the phenomenon that big pipeline etc. causes coal gas not normal occurs.
Coal gas control is carried out to the ultra-large type blast furnace, specifically includes: monitoring that the air quantity of the ultra-large type blast furnace reaches
Full blast it is horizontal 70%, and when pressure difference is greater than the 80% of pressure difference during normal production, forbids plus wind；Monitor that pressure oscillation is greater than just
Timely checking control when normal pressure power 10%.Specifically, appropriate steady to coal gas when air quantity reaches horizontal 70% of full blast
Periodically, pressure difference is controlled in operation, wind is firmly not added when pressure difference is higher, cannot firmly destroy coal gas；Pressure instability is wanted when standing out
Timely checking control.
Boiler pressure control is carried out to the ultra-large type blast furnace, is specifically included:
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 60% of full blast, wind amplitude is added to be less than or equal to 500m3/
Min/ times, wind interval is added to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 70% or more of full blast, wind amplitude is added to be less than or equal to
300m3/ min/ times, add wind interval to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 80% or more of full blast, wind amplitude is added to be less than or equal to
200m3/ min/ times, add wind interval to be more than or equal to 15min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 95% or more of full blast, wind amplitude is added to be less than or equal to
100m3/ min/ times, add wind interval to be more than or equal to 15min.
Further, the full blast total oxygen time for controlling the ultra-large type blast furnace is the half of blowing-out time.That is, complete
Wind, the control of total oxygen time are the 1/2 of the blowing-out time.
Further, blowing-out previous cycle prevents offensive adjustment to during recovery full blast, avoids that airflow fluctuation occurs.
Step 13, blowing-out disorderly material control is carried out to the ultra-large type blast furnace.
In the specific implementation process, before reaching cohesive zone under blowing-out depth stockline disorderly material, described in real-time monitoring and control
The air-flow and temperature of ultra-large type blast furnace；It controls constant in pressure difference furnace and control coal gas fluctuating range and is less than default fluctuation threshold.
That is, blowing-out depth stockline pays attention to steady air current and temperature control before reaching cohesive zone under disorderly expecting, operate with strict control
Based on pressure difference, pressure instability, timely checking control when standing out, while preventing offensive adjustment during crossing disorderly material, it avoids that coal occurs
Wave is dynamic.
Step 14, to the ultra-large type blast furnace carry out blowing-out, air-supply stop voltage-controlled system so that press will be with bosh tolerance phase
Matching.
Further, after full blast, charging is adjusted into the state to blowing-out according to the working of a furnace is practical, while gradually restoring negative
Lotus.
In the above implementation process, by reducing, blowing-out material coke load, coal gas is dredged in adjustment air-supply charging, optimization is blown
In recovery process air quantity and pressure difference control come shorten recovery time, reduce coke consumption, avoid the working of a furnace fluctuate caused by yield damage
It loses and quickly full blast reaches production.This method can be effectively reduced the air-supply recovery time of ultra-large type blast furnace, improve blast fumance efficiency,
Reduce smelting cost.This method is suitble to use on the ultra-large type blast furnace that heavy load is smelted.
One or more embodiment through the invention, the invention has the advantages that advantage:
The invention discloses a kind of air-supply restoration methods, and being primarily directed to ultra-large type blast furnace, (coke is negative in heavy load
Lotus is greater than the fast quick-recovery of the working of a furnace 5.50), under big coal ratio (coal ratio is higher than 195kg/t) smelting condition after blowing-out.This method is intended to
The edge coal gas of the ultra-large type blast furnace is dredged by controlling, while enhancing the center coal gas aperture of the ultra-large type blast furnace, it is excellent
Change air-supply recovery process in plus wind parameter, control blowing-out disorderly expect, and to ultra-large type blast furnace carry out blowing-out, air-supply stop it is voltage-controlled
It makes, to shorten recovery time, production loss caused by avoiding the working of a furnace from fluctuating and quickly full blast, which reach, to be produced.This method can be effectively reduced
The air-supply recovery time of ultra-large type blast furnace improves blast fumance efficiency, reduces smelting cost.This method is suitble to smelt in heavy load
Ultra-large type blast furnace on use.
Although the preferred embodiment of the application has been described, but one of ordinary skilled in the art once knows substantially
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (10)
1. a kind of air-supply restoration methods are mainly used for ultra-large type blast furnace sending when blowing-out under the smelting condition of the big coal ratio of heavy load
Wind restores, and the ultra-large type blast furnace is dischargeable capacity 4000m3More than, heavy load is 5.50 or more coke load, and big coal ratio is coal
Than 195kg/t or more, which is characterized in that the described method includes:
During carrying out air-supply recovery after blowing-out, the edge coal gas of the ultra-large type blast furnace is dredged in control, while enhancing institute
State the center coal gas aperture of ultra-large type blast furnace；
Control the ultra-large type blast furnace adds wind parameter；
Blowing-out disorderly material control is carried out to the ultra-large type blast furnace；
To the ultra-large type blast furnace carry out blowing-out, air-supply stop voltage-controlled system so that press to match with bosh tolerance.
2. the method as described in claim 1, which is characterized in that dredge the edge coal of the ultra-large type blast furnace in the control
Gas, while before enhancing the center coal gas aperture of the ultra-large type blast furnace, the method also includes:
The working of a furnace is controlled before blowing-out, makes [Si] control 0.3% or more, 1500 DEG C of molten iron temperature or more.
3. the method as described in claim 1, which is characterized in that described to make [Si] control 0.3% or more, molten iron temperature 1500
DEG C or more after, the method also includes:
According to load 0.3-0.5 is moved back, contracting mine batch 5-10t moves back load to carry out blowing-out material.
4. the method as described in claim 1, which is characterized in that it is described to control the edge coal gas for dredging the ultra-large type blast furnace,
Before the center coal gas aperture for enhancing the ultra-large type blast furnace simultaneously, the method also includes:
The lip temperature value of real-time monitoring coal gas, judges whether the lip temperature value is less than preset temperature threshold；
If so, indicating that the edge coal gas is overweight, and then the edge coal gas for dredging the ultra-large type blast furnace is controlled, enhanced simultaneously
The center coal gas aperture of the ultra-large type blast furnace.
5. the method as described in claim 1, which is characterized in that the control ultra-large type blast furnace adds wind parameter, specifically
Include:
Oxygen control is carried out to the ultra-large type blast furnace；Or
Coal gas control is carried out to the ultra-large type blast furnace；Or
Boiler pressure control is carried out to the ultra-large type blast furnace.
6. method as claimed in claim 5, which is characterized in that it is described that Oxygen control is carried out to the ultra-large type blast furnace, specifically
Include:
The air quantity for monitoring the ultra-large type blast furnace is less than horizontal 70% of full blast, then forbids using oxygen；
When monitoring the air quantity of the ultra-large type blast furnace and being in preset range, control flow of oxygen is less than 10000m3/h；Wherein, described
Preset range is [the 70% of full blast level, the 80% of full blast level].
7. method as claimed in claim 5, which is characterized in that it is described that coal gas control is carried out to the ultra-large type blast furnace, specifically
Include:
Monitor that the air quantity of the ultra-large type blast furnace reaches horizontal 70% of full blast, and pressure difference is greater than pressure difference during normal production
Forbid adding wind when 80%；
Monitor timely checking control when pressure oscillation is greater than normal pressure 10%.
8. method as claimed in claim 5, which is characterized in that it is described that Boiler pressure control is carried out to the ultra-large type blast furnace, specifically
Include:
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 60% of full blast, wind amplitude is added to be less than or equal to 500m3/ min/ times,
Wind interval is added to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 70% or more of full blast, wind amplitude is added to be less than or equal to 300m3/
Min/ times, wind interval is added to be more than or equal to 20min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 80% or more of full blast, wind amplitude is added to be less than or equal to 200m3/
Min/ times, wind interval is added to be more than or equal to 15min；
When monitoring the air quantity of the ultra-large type blast furnace and reaching horizontal 95% or more of full blast, wind amplitude is added to be less than or equal to 100m3/
Min/ times, wind interval is added to be more than or equal to 15min.
9. method as claimed in claim 5, which is characterized in that the control ultra-large type blast furnace adds wind parameter, specifically
Further include:
The full blast total oxygen time for controlling the ultra-large type blast furnace is the half of blowing-out time.
10. the method as described in claim 1, which is characterized in that it is described that blowing-out disorderly material control is carried out to the ultra-large type blast furnace,
It specifically includes:
Before reaching cohesive zone under blowing-out depth stockline disorderly material, the air-flow and temperature of real-time monitoring and the control ultra-large type blast furnace；
It controls constant in pressure difference furnace and control coal gas fluctuating range and is less than default fluctuation threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811573210.4A CN109628670B (en) | 2018-12-21 | 2018-12-21 | Air supply recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811573210.4A CN109628670B (en) | 2018-12-21 | 2018-12-21 | Air supply recovery method |
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| CN109628670A true CN109628670A (en) | 2019-04-16 |
| CN109628670B CN109628670B (en) | 2020-12-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109628670B (en) | 2020-12-11 |
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