CN100580095C - Blast furnace banking method - Google Patents
Blast furnace banking method Download PDFInfo
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- CN100580095C CN100580095C CN200810069462A CN200810069462A CN100580095C CN 100580095 C CN100580095 C CN 100580095C CN 200810069462 A CN200810069462 A CN 200810069462A CN 200810069462 A CN200810069462 A CN 200810069462A CN 100580095 C CN100580095 C CN 100580095C
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- damping down
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Abstract
The invention discloses a blast furnace stewing process, which comprises the following steps that adding blowing-down burden material in a blast furnace, damping down when blowing-down burden material reaches to the upper edges of a furnace hearth, gradually descending stock-line to the several meters under a furnace throat, adopting the way of watering on the furnace top portion and appropriate reducing blast, controlling the temperature of the furnace top portion within 300 DEG C, instantly opening a blast pipe cover plate, plugging an air inlet with water-stem, then covering on the cover plate, starting to press coke free positive material and positive material into the blast furnace after plugged the air inlet, controlling the temperature of the furnace top portion about at 200 DEG C, wherein the furnace top portion temperature can gradually descended to 100 DEG C in 3 hours after stewing material is finished to fill. The process has excellent stewing effect, has stable temperature in the blast furnace, can shortens blow-in process after stewing, can fast recover the furnace situations after air recovery in the blast furnace, can generate iron in large amount, has stable slag basicity after stewing burden discharged, can guarantee the iron water quality, can save large amount of coke and grain slag, can improve blast furnace technical economical index and create favorable economical benefits.
Description
Technical field
The present invention relates to a kind of blast furnace banking method, particularly a kind of stewing stove method that reduces the blast furnace throat temperature, this method can reach the effect of the stewing stove method of tradition, and help recovering as early as possible working of a furnace increase pig iron output and guarantee molten steel quality.
Background technology
Modern iron manufacturing process is to carry out in blast furnace; blast furnace is to build the vertical cylindrical furnace that forms by laying bricks or stones by refractory materials; the furnace shell that has steel plate to make is outward reinforced sealing, embedded water cooler and refractory materials protection, and stove is divided into furnace throat, shaft, furnace bosh, bosh and cupola well from top to bottom successively.Ironmaking is at high temperature smelted into iron ore metallic iron exactly in blast furnace process, whole process be furnace charge from top to bottom, coal gas being in contact with one another in the process from bottom to top finish.In the blast-furnace smelting production process,, equipment in furnace roof or the stove needs the damping down maintenance when influence is produced when breaking down.When maintenance, often need the staff to enter and carry out constructing operation in the stove, because behind the blast furnace staying, temperature is higher in the stove, thereby need boil in a covered pot over a slow fire stove to blast furnace and reduce temperature in the stove as early as possible, so that the staff can enter construction in the stove.
Traditional stewing stove method is that employing adds grain slag or rawore is pressed throat temperature.Because the tightness of grain slag is better, behind the stewing stove of employing grain slag, the blow-on process is longer, and furnace condition recovery difficulty behind the furnace compound wind is recovered the normal time thereby prolonged blast furnace; And when adopting rawore boil in a covered pot over a slow fire stove, because the acid mineral substance that rawore contains is more, after stewing stove was finished, a large amount of stewing stove acid expected to come out of the stove and will cause basicity of slag low, influenced molten steel quality.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide a kind of multiple wind after furnace condition recovery fast, the stewing furnace charge back basicity of slag of coming out of the stove is stable and can reach the stewing stove method of the stewing stove mode effect of tradition.
The object of the present invention is achieved like this: a kind of blast furnace banking method is characterized in that may further comprise the steps:
(1) before blast furnace staying, adds the damping down material, damping down material damping down during to the cupola well upper edge;
(2) in empty stockline process progressively, take that furnace roof is fetched water, the suitable mode of checking, the control throat temperature is in 300 ℃ of scopes;
(3), require stock line in the furnace to arrive below 5 meters behind the damping down by control of air quantity during slow wind and determining of damping down time;
(4) the blowpipe cover plate is opened in earlier stifled air port behind the damping down immediately, with the stifled tight air port of hydrous taphole loam, covers cover plate then;
(5) behind the stifled good air port, add stewing stove cold burden again: adds that three～four crowdes of no Jiao are just expecting and four batches have Jiao just expecting in the stove, arrive 1.8～2 meters of stocklines, this stewing stove cold burden thickness is 3～5 meters, controls throat temperature at 200 ℃～250 ℃;
(6) after furnace roof batch can material has descended, throat temperature progressively drops to about 100 ℃, and personnel can enter operation in the stove.
Compared to existing technology, the present invention has following beneficial effect:
1, the present invention courageously adopts the stewing stove new technology of cancellation grain slag and rawore to press throat temperature, adds no Jiao earlier and is just expecting just to add again and expect that not only stewing stove effect is better than traditional method, helps again increasing production and guarantees the quality.
2, heavy in production task, under the demanding situation of molten steel quality, can shorten blast furnace behind the stewing furnace accretion bundle and recover normal process, furnace condition recovery is fast behind the furnace compound wind, helps the volume increase wound and imitates.
3, after stewing furnace charge was come out of the stove, basicity of slag was stable, and molten steel quality is guaranteed.
4, the inventive method adds earlier that a certain amount of nothing is burnt is just expecting to add the way of just expecting again, reaches good stewing stove effect by consumption reasonably combined, has saved a large amount of coke and grain slag.
5, present method can be improved the blast-furnace technique economic target in actual application, creates good economic benefit.
Embodiment
A kind of blast furnace banking method, according to the damping down time, add the damping down material proper time in blast furnace before damping down; Damping down when making the damping down material to the cupola well upper edge, and the damping down time can be identical with planned time; Can reach the empty stockline of actual institute behind the damping down requires empty stockline consistent with scheduled overhaul; In the empty stockline process, take the furnace roof of a certain amount of and ratio to fetch water and the checking mode, can control throat temperature well near 300 ℃ of scopes; Behind the damping down,, make the least possible generation coal gas in the blast furnace, the safety of operation in the stove during with the assurance maintenance by taking a series of seal approach in the zone, air port; Behind the stifled good air port, beginning to add a certain proportion of no Jiao is just expecting and is just expecting in the stove, after this stewing furnace charge is added, can reach charge level in the position that requires and can satisfy the maintainer and enter the temperature requirement of constructing in the stove, behind the intact multiple wind of blast furnace maintenance, add suitable recovery furnace charge again according to stewing charge composition of add, with furnace charge and the heat balance that satisfies blast furnace.
Specific embodiment: protect as heavy steel five blast furnaces (useful volume 1200m3) furnace roof chute and to break down, need overhaul, this maintenance will be opened big sect, and personnel enter and change the chute backplate in the stove.Be the temperature requirement that guarantees to enter operation in the stove during maintenance, adopted the present invention that blast furnace is boiled in a covered pot over a slow fire stove, reduce throat temperature, satisfied personnel and entered the interior temperature requirement of stove, and do not influenced construction speed.Concrete enforcement is as follows:
1, formulated detailed blowing out and add the cold burden scheme
1) adds burnt 9.4 tons of damping down earlier, add 4.7 tons again after is just expecting at 3 batches at interval.Indicate coke moisture 3.5%.
Just expecting to form:
| Criticize in the ore deposit | Coke (per) charge | The Qijiang ore deposit | The Australia ore deposit | Add ball | S1 | S3 |
| 26 | 9.4 | 0.7 | 1.8 | 2.5 | 9.1 | 11.9 |
Wherein, S1, S3 are agglomerate.According to calculating: 4 meters of stockline are 934.87m to the volume of bosh lower edge
3, the burnt volume 24.82m of deduction damping down
3, can adorn the volume of just expecting before the damping down is 910.05m
3, positive charge number is 31 batches, is just expecting volume: 31 * 29.01=899.31m
3Stockline can reach below 5 meters behind the damping down.
Change please by following change material as charge composition and composition:
Come out of the stove basicity of slag by about 1.10 controls, about coke ratio 615Kg/tTe.
Calculate and press 0.7% button pig iron silicon when just expecting.
2) cold burden is formed:
Require behind the damping down to press cold burden again below the stockline sky to 5 meter, pressing the volume of cold burden is 118.2m
3About (press cold burden then will vacate 2 meters stockline), cold burden is composed as follows:
| Hop count | Charging | Lot number is criticized | Australia ore deposit t | Add ball t | S1 t | S3 | Qijiang ore deposit t | Coke (per) charge t | Compression volume |
| 1 | No Jiao just expects | 3 | 1.8 | 2.5 | 9.1 | 11.9 | 0.7 | - | 37.4 |
| 2 | Just expect | 3 | 1.8 | 2.5 | 9.1 | 11.9 | 0.7 | 9.4 | 87.03 |
| Add up to | 124.43 |
Annotate: supply behind the multiple wind of coke that (1) the 1st section material differs from.
(2) the 2nd sections material increase and decrease for 2 meters by stockline, but can not carry more than the stockline to 2 meter.
2, blowing out process
Add damping down Jiao before the damping down earlier and become then, just begin level-lowering, 31 batches of blankings, 5 hours times spent, average air quantity 2346m into stewing furnace charge
3/ min.Be respectively every one hour air quantity, stockline, top temperature therebetween:
| Time | Air quantity | Stockline | The top temperature |
| 1 | 2587m3/min | 2.0m | 227℃、211℃、234℃、229℃ |
| 2 | 2526m3/min | 2.5m | 203℃、183℃、199℃、212℃ |
| 3 | 2314m3/min | 3m | 206℃、190℃、199℃、210℃ |
| 4 | 2254m3/min | 3.8m | 230℃、212℃、216℃、228℃ |
| 5 | 2051m3/min | 4m | 332℃、303℃、310℃、349℃ |
In the empty stockline process, take that furnace roof is fetched water, the suitable mode of checking, the control throat temperature is in 300 ℃ of scopes; Then, open 18 blowpipe cover plates,, cover cover plate then with the stifled tight air port of hydrous taphole loam;
Behind the stifled good air port, presses three crowdes of no Jiao just expecting with four batches have Jiao just to expect, to stockline 1.8～2m, under the back furnace roof batch can charging after, charge level arrives the throat armour upper limb substantially, pushes up warm 200～250 ℃.
Wherein, no Jiao is just expecting that weight consists of: rawore 5～10%, and pellet 10～15%, all the other are agglomerate; Just expecting that weight consists of: rawore 5～10%, pellet 10～15%, all the other are agglomerate.
3, press the stewing stove process of cold burden behind the damping down
As stockline 6.3m after the morning, 7:00 divided damping down, the top temperature is about 250 ℃, opens 18 blowpipe cover plates behind the damping down, with the stifled tight air port of hydrous taphole loam, cover cover plate then, blocked up at 8 o'clock press behind the air port 3 crowdes of no Jiao just expecting with four batches burnt material is arranged afterwards to 9 o'clock, the top temperature is about 200 ℃, to stockline 2m,, after the material of furnace roof left and right sides batch can dress had descended, charge level arrived the throat armour upper limb substantially, open the big sect of furnace roof, the 12:30 workmen enters operation in the stove.
4, blast furnace recovery situation behind the multiple wind
When crossing this stewing furnace charge with 900 ℃ of wind-warm syndrome, humidity 3t/h, air quantity 2520-2560m
3/ min, furnace temperature [si] 0.58-0.66%.The working of a furnace does not have considerable change when crossing no Jiao and just expecting.
Load 2.78 behind the multiple wind, coke ratio 612Kg/tFe material, air quantity 2520m3/min, wind-warm syndrome 900-1000 ℃, humidity 0.5-1.5t/h.The furnace temperature of coming out of the stove [si] 0.6-0.7%.
Basicity: during the school 1.0,1.10-1.15 comes out of the stove.
5, actual effect
(1) furnace condition recovery is fast behind the multiple wind.Just begin to walk material behind the multiple wind, recovered the only slow wind of the working of a furnace 54 minutes, the coal powder injection material has been gone in change in 2 hours behind the multiple wind.
The working of a furnace does not have considerable change when (2) boiling in a covered pot over a slow fire furnace charge excessively.Basicity of slag 1.11～1.16 after coming out of the stove, molten iron all is a high-quality iron (s is less than 0.04% in the molten iron).
(3) crossing under in a large number stewing furnace charges and the complete burnt situation of expecting behind the multiple wind, when 2865.85 tons of daily output iron, utilization coefficient reaches 2.51.
(4) furnace roof can satisfy the requirement of maintenance to temperature in the stove after pressing cold burden.Press cold burden after 3 and a half hours, the maintainer enters construction in the stove.
6, economic benefit
Empty stockline blowing out cancellation grain slag of five blast furnaces and the stewing stove of rawore, technical indicator is improved obviously, has shortened blast furnace and has recovered the normal time; Created bigger economic benefit.
Boil in a covered pot over a slow fire grain slag and rawore consumption and furnace condition recovery situation in the furnace charge after the empty stockline blowing out
Facts have proved: use this new technology once, can save 60 tons of grain slags, 60 tons in coke reduces the 476 minutes slow wind time of recovering the working of a furnace.
Adopt this new technology once, can save 60 tons of grain slags, 60 tons of cokes, furnace condition recovery is fast behind the multiple wind, can reduce slow wind 476 minutes, can increase 195 tons of iron at least.The grain slag unit price is by 30 yuan/ton, and its direct economic benefit is 0.18 yuan.The coke unit price is by 870 yuan/ton, and its direct economic benefit is 5.22 ten thousand yuan.Average daily output is by 2950 tons, and ton ferropexy expense is by 68 yuan of calculating, and its direct economic benefit is 1.326 ten thousand yuan.Then adopting this new technology direct economic benefit once is 6.726 ten thousand yuan.1 year shutdown maintenance of five blast furnaces 3～4 times calculates for 3 times by maintenance in a year, and then the direct economic benefit in 1 year is at least 20.178 ten thousand yuan.
7, this stewing stove method is noted in specific implementation process:
At least one smelting cycle changes full coke for smelting before the damping down, falls and suitably adjusts ore deposit, JiaoαJiao in the stockline process, and operation meticulously keeps working of a furnace stable smooth operation.
Furnace temperature is gone on limit before the damping down, and [Si] presses 0.6%-0.8% control, last stove furnace temperature [Si] about 0.8%, basicity of slag≤1.15.
Add damping down Jiao, become simultaneously and go into stewing furnace charge, the damping down material is to cupola well upper edge damping down.
The stockline sky is taked progressively empty stockline to the stockline that requires after requiring damping down, and the control throat temperature is in 300 ℃ of scopes in the empty stockline process, and temperature control method in top is: shift to an earlier date empty gradually stockline, furnace roof is fetched water, suitable checking etc.)
Add damping down Jiao cancellation in preceding 8～10 hours vanadium titanium ball.
Beat tapping outlet in last hour with the burnt bosh lower edge that arrives of damping down, the iron mouth blows the back damping down greatly, and last stove iron is blocked up and used hydrous taphole loam, suitably decrement.Stopper pressurized air is closed in the stokehold behind the damping down.
Behind the damping down immediately establishment officer open 18 blowpipe cover plates, with the stifled tight air port of hydrous taphole loam, cover cover plate then.
Begin to press cold burden behind the stifled good air port, binder is opened two damping down sects to the position that requires, and lights charge level, presses cold burden according to circumstances again.
Claims (3)
1, a kind of blast furnace banking method is characterized in that may further comprise the steps:
(1) before blast furnace staying, adds the damping down material, damping down material damping down during to the cupola well upper edge;
(2) in empty stockline process progressively, take that furnace roof is fetched water, the suitable mode of checking, the control throat temperature is in 300 ℃;
(3), require stock line in the furnace to arrive below 5 meters behind the damping down by control of air quantity during slow wind and determining of damping down time;
(4) the blowpipe cover plate is opened in earlier stifled air port behind the damping down immediately, with the stifled tight air port of hydrous taphole loam, covers cover plate then;
(5) behind the stifled good air port, add stewing stove cold burden again: adds that three～four crowdes of no Jiao are just expecting and four batches have Jiao just expecting in the stove, arrive 1.8～2 meters of stocklines, this stewing stove cold burden thickness is 3～5 meters, controls throat temperature at 200 ℃～250 ℃;
(6) after furnace roof batch can material has descended, throat temperature progressively drops to 100 ℃, and personnel enter operation in the stove.
2, blast furnace banking method according to claim 1 is characterized in that not concentrating in the described stewing stove cold burden adding grain slag or rawore.
3, blast furnace banking method according to claim 1 is characterized in that adding earlier in the described stewing stove cold burden no Jiao and is just expecting to be added with Jiao again and just expect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810069462A CN100580095C (en) | 2008-03-12 | 2008-03-12 | Blast furnace banking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810069462A CN100580095C (en) | 2008-03-12 | 2008-03-12 | Blast furnace banking method |
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| Publication Number | Publication Date |
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| CN101250599A CN101250599A (en) | 2008-08-27 |
| CN100580095C true CN100580095C (en) | 2010-01-13 |
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| CN200810069462A Expired - Fee Related CN100580095C (en) | 2008-03-12 | 2008-03-12 | Blast furnace banking method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102399923A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Material changing method for long-term blowing down of blast furnace |
| CN104630397A (en) * | 2015-02-01 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Method for quickly restoring coal injection in large-size blast furnace regular inspection |
| CN107828925B (en) * | 2017-10-30 | 2019-05-03 | 山西太钢不锈钢股份有限公司 | A kind of blast furnace roof temprature control method |
| CN109022648B (en) * | 2018-08-14 | 2020-06-26 | 山西太钢不锈钢股份有限公司 | Method for controlling furnace top temperature |
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2008
- 2008-03-12 CN CN200810069462A patent/CN100580095C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 邯钢3号高炉小修闷炉及复风操作. 何艳红等.炼铁，第21卷第3期. 2002 |
| 邯钢3号高炉小修闷炉及复风操作. 何艳红等.炼铁，第21卷第3期. 2002 * |
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