CN106319115A - Method for quick repair of blast furnace hearth local damage - Google Patents
Method for quick repair of blast furnace hearth local damage Download PDFInfo
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- CN106319115A CN106319115A CN201510332714.7A CN201510332714A CN106319115A CN 106319115 A CN106319115 A CN 106319115A CN 201510332714 A CN201510332714 A CN 201510332714A CN 106319115 A CN106319115 A CN 106319115A
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- blast furnace
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- temperature
- retaining
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Abstract
The invention discloses a method for quick repair of blast furnace hearth local damage, and the method is used for quick repair of hearth local damage. The method includes: judging a blast furnace hearth temperature anomaly part and hearth damage, then blowing a furnace protection raw material from an air port near the blast furnace hearth temperature anomaly part, at the same time increasing the flow rate of cooling water at the blast furnace hearth temperature anomaly part and enhancing the blast furnace oxygen enrichment rate, using TiO2 containing mineral powder or its mixture as the furnace protection raw material, when slag tapping starts in the tapping process, starting blowing the furnace protection raw material from the air port near the blast furnace hearth temperature anomaly part, and stopping the process when iron slag is discharged completely. Compared with the prior art, the furnace protection raw material is conveyed from the blast furnace air port so as to be quickly sent into the blast furnace hearth, thus enhancing the blast furnace protection efficiency and effect, at the same time reducing the influence of increase of titanium content in iron slag to iron slag fluidity. Moreover, the method provided by the invention can reasonably control the dosage and timing of the furnace protection raw material used by the blast furnace, thus greatly reducing the blast furnace protection cost.
Description
Technical field
The present invention relates to prolonging campaign technology, particularly relate to the side of a kind of quick reparation blast furnace crucibe local damage
Method, belongs to field of metallurgy.
Background technology
Modern Large Blast Furnaces require generation stove labour without in repair more than 15 years, although blast furnace fireproof material, cold
But the technology such as equipment and cooling medium obtains and significantly improves, but blast furnace crucibe and furnace bottom in actual production process
Locally liner often occurs to corrode or damage, and has a strong impact on campaign life, only minority blast furnace generation stove labour
Life-span reaches design object.Can blast furnace long-lived in addition to depending on the design of blast furnace crucibe, construction quality, also
Regular job with blast furnace particularly maintenance to cupola well is closely bound up.
The liner of local damage repaired under production status by blast furnace, and a kind of method is to add titanium ore or titanium from furnace roof
Ball, titaniferous material reacts under the conditions of furnace high-temperature and generates the infusibility material such as titanium carbide and titanium nitride, deposition
Protective layer is formed to bosh gas index and furnace bottom.Titanium ore preparation method has two kinds, and one is to use containing TiO2It is more than
9%, granularity is 10～50 natural lump ores；Another kind is to use cold-press agglomeration, the method preparing cold-press agglomeration
It is less than 5 perovskite powders and certain proportion binding agent mixing compound stalk forming granularity, suitable particle size agglomeration is carried out
It is dried and reaches some strength.Titanium ore adds in stove for furnace retaining (domestic patent " a kind of blast furnace protecting from furnace roof
By titanium ore cold briquetting and production method thereof " application number 200410067669.9).The method preparing titanium pelletizing also has
Two kinds, one is to select suitable TiO2Dispensing, pelletizing, roasting and cooling is carried out with the furnace charge of TFe content,
Form roasting titaniferous pelletizing；Another kind is to select containing TiO2Mix with certain proportion binding agent more than 40% titanium fine powder
Combined pressure ball, forms cold bound pellet after natural drying.Titanium pelletizing adds in stove for furnace retaining (state from furnace roof
Interior patent " high-titanium protection stove pellet ore and preparation method thereof " application number 200810304188.3).Above two side
Method solves the protection problem of basque, but owing to furnace charge loads from furnace roof, has the biggest portion in process of production
The titanium divided enters in molten iron and slag, and the utilization rate of titanium is relatively low, just exacerbates the consumption of titaniferous furnace charge, and furnace retaining becomes
This is higher, disappears additionally due to the quantity of slag increases and generates the chemical reaction such as titanium carbide and titanium nitride under the high temperature conditions
Heat consumption, coke consumption increases, and normal production of blast furnace is produced certain negative effect.
Another kind of method is from tuyere feeding, i.e. titaniferous furnace charge is made core-spun yarn, sends in stove from air port, carries
High titanium material use efficiency (domestic patent " the online restorative procedure in local of blast furnace crucibe and furnace bottom " application number
200410021541.9), but this do not solve blast furnace coke ratio raise and affect the problems such as smooth operation of furnace (see literary composition
Offer " Laigang 1 blast-furnace tuyere thread feeding and furnace protecting is put into practice " author: prince's gold etc. " ironmaking " 2008).
Above-mentioned existing method has considered only the preparation process using furnace retaining raw material, still has some not solve,
Thus can not furnace retaining quickly and effectively, existing method if it were not for from top furnace roof load furnace retaining raw material, or be from
Furnace bottom includes that furnace retaining raw material is sent in air port etc., all have ignored the operating process of blast furnace protecting, iff furnace retaining
Furnace charge joins in blast furnace, and the smelting cycle intrinsic due to blast furnace is long, is reacted to furnace bottom and plays action of protecting furnace
Time is longer.Therefore, it is necessary to develop a kind of method that quick reparation blast furnace crucibe is damaged, in conjunction with blast furnace operating
Means, enable the furnace retaining composition in blast furnace protecting raw material to gather rapidly the damaged part of blast furnace crucibe.
Summary of the invention
The present invention, precisely in order to solve the deficiency of the furnace retaining method mentioned in background technology, considers blast furnace protecting
Material characteristic and the reality of blast furnace operating, a kind of method designing quick reparation blast furnace crucibe local damage,
Solve conventional furnace retaining cycle length, cost high shortcoming.Use the method furnace retaining can be effectively in basque thinning area
Containment vessel is set up in territory, thus plays and slow down blast furnace crucible corrosion and improve the effect of the life of the blast furnace.
Technical scheme comprises the following steps:
1, blast furnace crucibe temperature anomaly position is judged.When find basque detection galvanic couple temperature rise too fast or
When cooling range is excessive, it is possible to use furnace retaining raw material carries out furnace retaining, decide whether that the foundation carrying out furnace retaining is:
Assuming that arrange m thermocouple on cupola well circumferencial direction, they are to be respectively in the temperature of current time
Ti(k), wherein i=1,2,3 ... m；Then m thermocouple of cupola well is T in the detection temperature of previous momenti(k-1),
Wherein i=1,2,3 ... m.If the temperature difference in moment is △ T before and after certain thermocouple of cupola welli: △ Ti=Ti(k)-Ti
(k-1), u is the temperature difference upper limit, wherein i=1,2,3 ... m.
Assuming that be mounted with n block cooling wall on cupola well circumferencial direction, they are in the temperature of current time cooling water Inlet and outlet water
Difference is Ej, e is the cooling range upper limit；
If meeting △ T > u or meeting Ej> e, the most at once this temperature anomaly position is carried out furnace retaining.
2, furnace retaining operation is implemented.Select winding-up furnace retaining at the air port of blast furnace crucibe temperature anomaly near sites former
Material, winding-up furnace retaining raw material strengthens the discharge of this blast furnace crucibe temperature anomaly position cooling water simultaneously, is enlarged to
The 130%-160% of the former water yield, to force to cool down cooling wall at this so that the carbon brick temperature in cooling wall at this
Reduce rapidly.Furnace retaining raw material smelts reaction, the wherein big portion in furnace charge along with the generation together of blast furnace ironmaking process
Divide TiO2Under furnace high-temperature reducing atmosphere condition, in TiN, TiC and Ti (CN) of generation and molten iron and molten iron
The graphite etc. separated out condenses in cupola well rapidly by the position of quickly cooling, brickwork joint that namely cupola well is etched and liner
Surface, serves the effect of quick furnace retaining.
3, winding-up furnace retaining material quantity is 110～160kg/t_pig, and furnace retaining raw material can select containing TiO2Breeze or
Its mixture.Start after seeing below slag during tapping a blast furnace to jet at the air port of blast furnace crucibe temperature anomaly near sites
Furnace retaining raw material, stops after going out clean slag ferrum.The purpose of do so is to reduce winding-up furnace retaining raw material to blast furnace crucibe
The impact of duty, it is to avoid blast furnace is crossed cool or slag ferrum viscosity and increased the blast furnace caused and be difficult to walk.
4, after furnace retaining raw material is sprayed into blast furnace by air port simultaneously, the chemical reaction in blast furnace is participated in, will certainly
Reduce theoretical tuyere combustion temperature.Therefore during winding-up furnace retaining raw material, it should properly increase Rich Oxygen Amount,
Oxygen enrichment percentage need to improve 0.5%-1%, it is ensured that smooth operation of furnace.
The present invention has following characteristics and a beneficial effect:
1, reasonably have selected the consumption of furnace retaining raw material due to this method and start on the opportunity of furnace retaining, to reduce and make
With time and the number of times of furnace retaining raw material, decrease Ti content in slag ferrum.Therefore, Ti content is effectively reduced too high
Impact on the mobility of slag ferrum, has little to no effect smooth operation of furnace, reduces furnace retaining cost simultaneously.
2, directly furnace retaining raw material is carried from blast-furnace tuyere due to this method so that furnace retaining raw material can quickly send
Entering blast furnace crucibe, thus improve efficiency and the effect of furnace retaining, particularly the State of Blast Furnace labour later stage, cupola well is by seriously
During erosion, the method more can be made the most of the advantage.
3, this method is with strong points, and furnace retaining raw material availability is high.According to damaged or lining temperature height region, choosing
Select 1-2 air port and concentrate winding-up furnace retaining raw material；Start furnace retaining raw material of jetting after seeing below slag during tapping a blast furnace, go out clean
Stopping after slag ferrum, furnace retaining raw material availability is high.
Detailed description of the invention
Below in conjunction with specific embodiment, the method quickly repairing blast furnace crucibe local damage of the present invention is made into one
The explanation of step:
Embodiment 1
1, blast furnace crucibe temperature anomaly position is judged.When find basque detection galvanic couple temperature rise too fast or
When cooling range is excessive, it is possible to use furnace retaining raw material carries out furnace retaining, decide whether that the foundation carrying out furnace retaining is:
Certain 3200m3Arranging 12 thermocouples on blast furnace crucibe circumferencial direction, they are in the temperature of current time
For respectively Ti(k), wherein i=1,2,3 ... 12；Then 12 thermocouples of cupola well are in the detection temperature of previous moment
For Ti(k-1), wherein i=1,2,3 ... 12.If the temperature difference in moment is △ T before and after the 5th thermocouple of cupola well5:
△T5=T5(k)-T5(k-1), u is the temperature difference upper limit, in this example, and u=80 DEG C.
When meeting △ T5> 80 DEG C, the most at once this temperature anomaly position is carried out furnace retaining.
2, furnace retaining operation is implemented.Select winding-up furnace retaining at the air port of blast furnace crucibe temperature anomaly near sites former
Material, winding-up furnace retaining raw material strengthens the discharge of this blast furnace crucibe temperature anomaly position cooling water simultaneously, cold at this
But the former water yield of wall is 100m3/ h, is now enlarged to the 140% of the former water yield, for 140m3/ h, to force to cool down at this
Cooling wall so that at this, carbon brick temperature in cooling wall reduces rapidly.Furnace retaining raw material is along with blast furnace ironmaking process one
Rise and occur to smelt reaction, the wherein most of TiO in furnace charge2Under furnace high-temperature reducing atmosphere condition, generate
TiN, TiC and Ti (CN) and molten iron and molten iron in the graphite etc. that separates out condense in cupola well rapidly by quickly cooling
Position, brickwork joint that namely cupola well is etched and inner lining surface, serve the effect of quick furnace retaining.
3, winding-up furnace retaining raw material dosage is 120kg/t_pig (one ton of ferrum of every cleared-out uses 120kg furnace retaining raw material),
Furnace retaining material choice contains TiO2 breeze or its mixture.Start from blast furnace crucibe temperature after seeing below slag during tapping a blast furnace
Winding-up furnace retaining raw material at the air port of the abnormal near sites of degree, stops after going out clean slag ferrum.The purpose of do so be in order to
Reduce the winding-up furnace retaining raw material impact on blast furnace crucibe duty, it is to avoid cool or slag ferrum viscosity increase crossed by blast furnace
The blast furnace caused is difficult to walk.
4, after furnace retaining raw material is sprayed into blast furnace by air port simultaneously, the chemical reaction in blast furnace is participated in, will certainly
Reduce theoretical tuyere combustion temperature 25-50 DEG C.Therefore, during winding-up furnace retaining raw material, rich-oxygen of blast furnace should be made
Rate improves 0.8%,.
5, this 3200m3No. 3 ferrum mouth current times of blast furnace set before and after certain thermocouple of cupola well the temperature difference in moment as
△T5＞ 80 DEG C, by implementing the furnace retaining step in the present invention, △ T5It is controlled in 50 DEG C, it is ensured that blast furnace is suitable
OK.
Embodiment 2
1, blast furnace crucibe temperature anomaly position is judged.When find basque detection galvanic couple temperature rise too fast or
When cooling range is excessive, it is possible to use furnace retaining raw material carries out furnace retaining, decide whether that the foundation carrying out furnace retaining is:
In this example, this 3200m3The temperature difference of a certain piece of cooling wall cooling water Inlet and outlet water of blast furnace current time is E6,
Cooling range upper limit e takes 0.8 DEG C, meets E6> 0.8 DEG C, the most at once this temperature anomaly position is carried out furnace retaining.
2, furnace retaining operation is implemented.Select winding-up furnace retaining at the air port of blast furnace crucibe temperature anomaly near sites former
Material, winding-up furnace retaining raw material strengthens the discharge of this blast furnace crucibe temperature anomaly position cooling water simultaneously, cold at this
But the former water yield of wall is 100m3/ h, is now enlarged to the 140% of the former water yield, for 140m3/ h, to force to cool down at this
Cooling wall so that at this, carbon brick temperature in cooling wall reduces rapidly.Furnace retaining raw material is along with blast furnace ironmaking process one
Rise and occur to smelt reaction, the wherein most of TiO in furnace charge2Under furnace high-temperature reducing atmosphere condition, generate
TiN, TiC and Ti (CN) and molten iron and molten iron in the graphite etc. that separates out condense in cupola well rapidly by quickly cooling
Position, brickwork joint that namely cupola well is etched and inner lining surface, serve the effect of quick furnace retaining.
3, winding-up furnace retaining raw material dosage is 120kg/t_pig (one ton of ferrum of every cleared-out uses 120kg furnace retaining raw material),
Furnace retaining material choice contains TiO2 breeze or its mixture.Start from blast furnace crucibe temperature after seeing below slag during tapping a blast furnace
Winding-up furnace retaining raw material at the air port of the abnormal near sites of degree, stops after going out clean slag ferrum.The purpose of do so be in order to
Reduce the winding-up furnace retaining raw material impact on blast furnace crucibe duty, it is to avoid cool or slag ferrum viscosity increase crossed by blast furnace
The blast furnace caused is difficult to walk.
4, after furnace retaining raw material is sprayed into blast furnace by air port simultaneously, the chemical reaction in blast furnace is participated in, will certainly
Reduce theoretical tuyere combustion temperature 25-50 DEG C.Therefore, during winding-up furnace retaining raw material, rich-oxygen of blast furnace should be made
Rate improves 0.8%,.
5, this 3200m3The temperature difference of the 6th piece of cooling wall cooling water Inlet and outlet water of No. 2 ferrum mouth current times of blast furnace is
E6> 0.8 DEG C, by implementing the furnace retaining step in the present invention, E6It is controlled in 0.5 DEG C, it is ensured that smooth operation of furnace.
Claims (2)
1. the method for a quick reparation blast furnace crucibe local damage, it is characterised in that: comprise the following steps:
1) blast furnace crucibe temperature anomaly position is judged:
Assuming that arrange m thermocouple on cupola well circumferencial direction, they are respectively T in the temperature of current timei
(k), wherein i=1,2,3 ... m；Then m thermocouple of cupola well is T in the detection temperature of previous momenti(k-1),
Wherein i=1,2,3 ... m；If the temperature difference in moment is △ T before and after certain thermocouple of cupola welli: △ Ti=Ti(k)-Ti
(k-1), u is the temperature difference upper limit, wherein i=1,2,3 ... m；
Assuming that be mounted with n block cooling wall on cupola well circumferencial direction, they are in the temperature of current time cooling water Inlet and outlet water
Difference is Ej, e is the cooling range upper limit；
If meeting △ Ti> u or meet Ej> e, the most at once this temperature anomaly position is carried out furnace retaining；
2) furnace retaining operation is implemented: select winding-up furnace retaining at the air port of blast furnace crucibe temperature anomaly near sites former
Material, winding-up furnace retaining raw material strengthens the discharge of this blast furnace crucibe temperature anomaly position cooling water simultaneously, is enlarged to
The 130%-160% of the former water yield, to force to cool down cooling wall at this；
3) winding-up furnace retaining material quantity is 110～160kg/t_pig, and furnace retaining material choice contains TiO2Breeze or its mix
Compound, starts furnace retaining raw material of jetting during tapping a blast furnace after seeing below slag, stop after going out clean slag ferrum；
4) during winding-up furnace retaining raw material, oxygen enrichment percentage improves 0.5%-1%.
The method of a kind of quick reparation blast furnace crucibe local damage the most according to claim 1, its feature
It is: cupola well electric thermo-couple temperature difference upper limit u takes 60-100 DEG C, and cooling wall cooling range upper limit e takes 0.6 DEG C
-1.0℃。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510332714.7A CN106319115A (en) | 2015-06-16 | 2015-06-16 | Method for quick repair of blast furnace hearth local damage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510332714.7A CN106319115A (en) | 2015-06-16 | 2015-06-16 | Method for quick repair of blast furnace hearth local damage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108220513A (en) * | 2017-12-26 | 2018-06-29 | 柳州钢铁股份有限公司 | Energy Conservation of Blast Furnace furnace retaining method |
| CN109306387A (en) * | 2017-07-26 | 2019-02-05 | 宝山钢铁股份有限公司 | A kind of furnace skin Conservative restoration method after blast furnace cooling stave scaling loss |
| CN112662827A (en) * | 2020-12-09 | 2021-04-16 | 江苏沙钢集团有限公司 | Blast furnace protection method without using titanium ore |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886153A (en) * | 2010-06-22 | 2010-11-17 | 武汉威林炉衬材料有限责任公司 | Maintenance method for blast furnace hearth |
| CN102433405A (en) * | 2012-01-06 | 2012-05-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace protecting method of iron-smelting blast furnace |
-
2015
- 2015-06-16 CN CN201510332714.7A patent/CN106319115A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886153A (en) * | 2010-06-22 | 2010-11-17 | 武汉威林炉衬材料有限责任公司 | Maintenance method for blast furnace hearth |
| CN102433405A (en) * | 2012-01-06 | 2012-05-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace protecting method of iron-smelting blast furnace |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109306387A (en) * | 2017-07-26 | 2019-02-05 | 宝山钢铁股份有限公司 | A kind of furnace skin Conservative restoration method after blast furnace cooling stave scaling loss |
| CN109306387B (en) * | 2017-07-26 | 2020-11-17 | 宝山钢铁股份有限公司 | Method for protecting and repairing furnace shell after blast furnace cooling wall burning loss |
| CN108220513A (en) * | 2017-12-26 | 2018-06-29 | 柳州钢铁股份有限公司 | Energy Conservation of Blast Furnace furnace retaining method |
| CN112662827A (en) * | 2020-12-09 | 2021-04-16 | 江苏沙钢集团有限公司 | Blast furnace protection method without using titanium ore |
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Application publication date: 20170111 |