CN105368995B - A kind of furnace charge method of replacing under blast furnace accident - Google Patents
A kind of furnace charge method of replacing under blast furnace accident Download PDFInfo
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- CN105368995B CN105368995B CN201510650382.7A CN201510650382A CN105368995B CN 105368995 B CN105368995 B CN 105368995B CN 201510650382 A CN201510650382 A CN 201510650382A CN 105368995 B CN105368995 B CN 105368995B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses the furnace charge method of replacing under a kind of blast furnace accident condition, continues to blow to blast furnace in the case where blast furnace top pressure is condition of normal pressure by existing supply air system.Reduce air port area (stifled air port, reducing tuyere diameter).Add a number of coke after air-supply, then interval adds light load material and net Jiao carries out feeding, and light load material is progressively transitioned into according to furnace temperature and furnace condition anterograde situation, slag iron emission behaviour.Furnace temperature is sufficient, blanking stable smooth operation, and depending on furnace top pressure situation, the mouth that progressively blows in increases air quantity work air port and reaches full blast mouth more than 2/3, and heavy burden is replaced, and blast furnace temperature is abundant, starts to fill banking material.Slag iron is handled by the normal mode of production, the labor intensity of worker will not increase, and worker does not enter inside blast furnace, in the absence of fetching water.Blow simultaneously recovery when, be coke entirely substantially inside blast furnace, air-supply recovers relatively smooth, blows out the probability of fried cool slag iron and low.The life of the blast furnace is influenceed small.Processing cost is low, processing time is short little impact on production.
Description
Technical field
The present invention relates to the furnace charge method of replacing under blast furnace banking method, more particularly to a kind of blast furnace accident.
Background technology
Because blast furnace process is smelted in the closed container under high temperature, high pressure, when burst accident occurs, blast furnace must
Production must be stopped and carry out accident treatment.But the processing to the heavy load furnace charge in blast furnace is always to perplex the problem of technical staff.
Handle existing two kinds of the processing mode of the high temperature heavy load furnace charge in blast furnace：
1st, blast-furnace tuyere takes off material method：Manually clawed from blast-furnace tuyere the furnace charge inside blast furnace.This processing method
Some shortcomings in practical operation be present：Time is grown, and upper kiloton furnace charge, which will pass through, fetches water cooling, manually from directly being taken off from air port
Go out, it is necessary to time first quarter moon, at most the 1-2 months at least.Working environment is severe, and worker must be in high temperature, high dust atmosphere bottom band material, shadow
It is physically and mentally healthy to ring worker., safety coefficient is low.Worker, which will enter in stove, takes off material, Wall of Blast Furnace bricking, adhesive have come off, under fall
Possibility, it is necessary to install additional protect fluffy, operation in stove of being allowed for access.The life of the blast furnace is reduced, due to be beaten when clearing up cupola well
Water, water contact with refractory brick, particularly brick fuel, reduce refractory brick service life, while blast furnace is reduced to normal temperature shape by the condition of high temperature
State, generation, which is expanded with heat and contract with cold, causes brick body, steel construction to deform, and it is stable to influence overall structure.Processing cost is high, and establishment officer takes off
Material, the transport processing by fluffy, the upper kiloton material of dress safety, will expend more cost
2nd, direct banking method：To be exactly the heavy burden in stove not to be handled, banking processing is directly carried out, blast furnace must
Gobbed up so occurs, gobbed up has to blast furnace harm, air-supply recovery time length.After gobbed up occurs for blast furnace, in blast furnace
Portion's temperature is low, airtight, rouses not air intake.Blast furnace must block up air port, progressively slow windward, progressively melt the cool stove inside blast furnace
Material, time or so January, at most several months at least.Cost and height.Blast furnace handles gobbed up, because coal gas utilization is poor, to add
Enter a large amount of coke and carry out heating furnace, the cool slag iron of kiloton in fusing, while the slag iron melted can only be discarded by that can not use, or
Re-work, handle cupola well frozen costs and height.Influence the life of the blast furnace.Gobbed up occurs for blast furnace, and iron mouth, must not out of iron
Oxygen must be used to burn iron mouth, and carry out explosion, the furnace charge fried in loose cupola well allows the descending heating cupola well of coal gas of high temperature.Burn iron mouth,
Explosion treatment, brick lining in blast furnace chamber is necessarily destroyed, shorten the life of the blast furnace, economic loss is huge.Labor intensity is big.A large amount of cool slag irons
Accumulated from the discharge of iron mouth in stokehold, need manual cleaning.Air port easily fills slag and burnt out during gobbed up processing simultaneously, it is necessary to damping down
Artificial treatment.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention is intended to provide a kind of furnace charge method of replacing under blast furnace accident condition
The present invention is achieved by following technical solution：
A kind of furnace charge method of replacing under blast furnace accident condition, its step are：
1) iron mouth is handled：Iron bicker degree is adjusted to minimum, and with oxygen rifle Jiang Tiekou and air port burn through, it is intraoral in iron after burn through
Embedded oxygen rifle；
2) furnace charge in the cupola well of inlet front end is handled：The furnace charge cleared up before air port is burnt to show, above iron mouth of leaving behind
Air port and two sets, and by 4 mutual burn throughs in air port by iron mouth, aluminium ingot and Nacl are added in air port after burn through, then will not
The punching of air-supply is clean and blocks.
3) air port area is adjusted：Existing tuyere diameter is reduced before air-supply, if blast furnace be heavy load if block again 3/4 with
Uptake；
4) air-supply displacement furnace charge：The big lock of cold wind and regulating valve are closed, hot-blast pressure is adjusted to be less than 40kpa air-supplies, air-supply
Backward blast furnace intersects the net coke of addition and light load material after adding net coke, is added after furnace temperature is more than 700 DEG C and gradually rises
Light load material, open the big lock of cold wind after adding light load material and slowly adjust cold air adjusting valve, after heavy burden is replaced
Furnace temperature be more than 1450 DEG C, air quantity level reach normal production when 40% when add banking material；
5) hydraulic pressure is recovered：Air port hydraulic pressure is recovered normal；
6) discharge slag iron：Extract oxygen rifle and beat tapping outlet, scum is gone out into net rear beginning damping down.
Handle inlet front end cupola well in furnace charge when, need to by all two sets of air ports, greatly set surface completed with stemming.
Need to carry out oxygen-enriched coal spray in time in charge process is replaced in air-supply.
Need to be after slag iron be discharged smoothly before cold wind is sent during charge process is replaced in air-supply.
The beneficial effects of the invention are as follows：
Compared with prior art, the furnace charge method of replacing under a kind of blast furnace accident condition provided by the invention will be by that will pass through
Existing supply air system is continued to zoom out into air port area under the conditions of blast furnace normal pressure top pressure to blow to blast furnace.Add a fixed number after air-supply
The coke of amount, then interval adds light load material and the net burnt feeding that carries out displaces heavy load furnace charge.With advantages below：
1st, the time for handling heavy burden is short.During generation burst accident, blast furnace is still in the working condition of a high temperature, slag
Iron good fluidity.Now handled by short time damping down, continue to blow (because coal gas system occurs to blast furnace by air blower
Accident, coal gas can only diffuse) and tap a blast furnace, furnace top pressure keeps normal pressure, and blast furnace continues to load light load furnace charge the weight in blast furnace
Load furnace charge is replaced, and after improving furnace temperature, loads banking material, then carry out blowing out processing equipment accident.This technical finesse time
Material is relatively taken off to greatly shorten.During blast furnace air-supply simultaneously, because furnace interior is to fill banking material (being coke entirely substantially), height air-supply is relative
Smoothly.
2nd, labor strength is low：After accident occurs, blast furnace is in Warm status, slag iron stream in short time multiple wind, blast furnace heat
Dynamic property is good, still can smoothly discharge, and blast furnace discharge yard remains to handle in the way of when normal production, realizes slag sluicing system, reclaims
Molten iron.Labor strength will not be aggravated substantially
3rd, the life of the blast furnace is influenceed small：For this technology when handling heavy burden, worker does not enter bar material inside blast furnace, does not deposit
Fetching water.Blow simultaneously recovery when, it is coke entirely substantially inside blast furnace to be planned prepared (plan banking), and air-supply is extensive
Complex phase blows out the probability of fried cool slag iron and low to smooth.The life of the blast furnace is influenceed small.
4th, processing cost is relatively low.Heavy burden in blast furnace when this technology is to processing burst accident, because the time is short,
Difficulty is low.Therefore expense is relatively fewer.
Embodiment
Technical scheme is described further below, but required protection domain be not limited to it is described；
Furnace charge method of replacing under a kind of blast furnace accident condition provided by the invention, its step are：
1) iron mouth is handled：Iron bicker degree is adjusted to minimum, and with oxygen rifle Jiang Tiekou and air port burn through, it is intraoral in iron after burn through
Embedded oxygen rifle；
2) furnace charge in the cupola well of inlet front end is handled：The furnace charge cleared up before air port is burnt to show, above iron mouth of leaving behind
Air port and two sets, and by 4 mutual burn throughs in air port by iron mouth, aluminium ingot and Nacl are added in air port after burn through, then will not
The punching of air-supply is clean and blocks.
3) air port area is adjusted：Existing tuyere diameter is reduced before air-supply, if blast furnace be heavy load if block again 3/4 with
Uptake；
4) air-supply displacement furnace charge：The big lock of cold wind and regulating valve are closed, hot-blast pressure is adjusted to be less than 40kpa air-supplies, air-supply
Backward blast furnace intersects the net coke of addition and light load material after adding net coke, is added after furnace temperature is more than 700 DEG C and gradually rises
Light load material, open the big lock of cold wind after adding light load material and slowly adjust cold air adjusting valve, after heavy burden is replaced
Furnace temperature be more than 1450 DEG C, air quantity level reach normal production when 40% when add banking material；
5) hydraulic pressure is recovered：Air port hydraulic pressure is recovered normal；
6) discharge slag iron：Extract oxygen rifle and beat tapping outlet, scum is gone out into net rear beginning damping down.
Handle inlet front end cupola well in furnace charge when, need to by all two sets of air ports, greatly set surface completed with stemming.
Need to carry out oxygen-enriched coal spray in time in charge process is replaced in air-supply.
Need to be after slag iron be discharged smoothly before cold wind is sent during charge process is replaced in air-supply.
Embodiment：After coal gas system accident occurs for No. 3 blast furnaces of water steel, damping down is needed 72 hours,
Operative employee first adjusts air port area.Before air-supply, existing tuyere diameter is reduced.It is (living in order to realize more air port work
Jump cupola well).Due to blowing-out preload weight, titanium ball ratio is high, in order to recover the working of a furnace as early as possible, blocks blast furnace 3/4 with uptake.
Reprocess the furnace charge in the cupola well of inlet front end.Plucked out slag iron is measured before whole air ports, show is burnt.By above iron mouth
Air port and two sets are left behind, and are down burnt and are connected with iron mouth.The mutual burn through in air port of Tie Kou both sides 4.After burned, aluminium ingot and industry are added
Salt, improve temperature before air port and reduce slag viscosity, improve slag iron mobility, avoid burning out air port and two sets.By what is do not blown
Clean again stifled mud is scratched in air port, is blown open automatically after not allowing air-supply.All two sets of air ports, set surface greatly are completed with stemming, are prevented
Burn burn out big set, two sets.
Handle iron mouth.Before air-supply, iron bicker degree is adjusted to minimum, and to iron mouth is burnt on oxygen, strive iron one's intention as revealed in what one says mouth
Gang up.Before air-supply, iron mouth buries oxygen rifle, and logical upper oxygen, ensures its burning.
Air-supply displacement furnace charge.Air-supply initial stage is operated by blast, and hot-blast pressure is pressed blows no more than 40kpa, and fully closed cold wind is big
Lock and regulating valve.Apparent wind mouth is bright, no swell slag phenomenon, blanking is normal, pressure magnitude relation is symmetrical, peripheral system is normal, slag iron discharge
Could progressively windward after smoothly.Make air quantity up to more than 40% of air quantity during production.Carried out when adding load material every time a small amount of
Oxygen-enriched coal spray, accelerate to improve furnace temperature.Upper blast furnace first adds a number of net coke, adds light load furnace charge transition.Weight
Load furnace charge is replaced.Blast-melted temperature is big more than 1450 DEG C.Air quantity level is up to more than 40%.Loading banking can be carried out
Material, carry out banking operation.
The cool slag iron of cast house processing.According to oxygen amount, and air-supply time is sent, it is determined that extracting oxygen rifle, tapping outlet is bored.If iron mouth
Airtight, feeder fire, does not organize to burn toward above iron mouth, untill gas is grilled thoroughly.Each iron mouth goes out first time iron, and slag iron is only
Sand mouth, subsequently whether cross sand mouth and determined according to physical thermal, when temperature is more than 1440 DEG C, slag iron amount can cross sand mouth up to more than 80t.
According to actual conditions, speed most fast to the greatest extent pours out the cool iron of cool slag.
Hydraulic pressure recovers.Before air-supply, shaft cooling system flow controls by during normal production 1/2, according to water temperature difference after air-supply
Actual conditions, when water temperature difference is greatly with normal water temperature difference 50%, normal water can be recovered.Before air-supply, air port water recovers normal hydraulic pressure
And flow.
Claims (3)
1. the furnace charge method of replacing under a kind of blast furnace accident condition, its step are：
1) iron mouth is handled：Iron bicker degree is adjusted to minimum, and with oxygen rifle Jiang Tiekou and air port burn through, it is intraoral embedded in iron after burn through
Oxygen rifle；
2) furnace charge in the cupola well of inlet front end is handled：The furnace charge cleared up before air port is burnt to show, the air port above iron mouth of leaving behind
With two sets, and by 4 mutual burn throughs in air port by iron mouth, aluminium ingot and Nacl are added after burn through in air port, then will not blow
Punching it is clean and block；
3) air port area is adjusted：Existing tuyere diameter is reduced before air-supply；
4) air-supply displacement furnace charge：The big lock of cold wind and regulating valve are closed, hot-blast pressure is adjusted to be less than 40kpa air-supplies, air-supply is backward
Blast furnace intersects the net coke of addition and light load material after adding net coke, is added after furnace temperature is more than 700 DEG C and gradually rises light negative
Lotus material, open the big lock of cold wind after adding light load material and slowly adjust cold air adjusting valve, in stove after heavy burden is replaced
Temperature be more than 1450 DEG C, air quantity level when reaching normal production 40% when add banking material；
5) hydraulic pressure is recovered：Air port hydraulic pressure is recovered normal；
6) discharge slag iron：Extract oxygen rifle and beat tapping outlet, scum is gone out into net rear beginning damping down；
Need to carry out oxygen-enriched coal spray in time in the air-supply displacement charge process.
2. the furnace charge method of replacing under a kind of blast furnace accident condition according to claim 1, it is characterised in that：In processing wind
During furnace charge in the cupola well of mouthful front end, need to by all two sets of air ports, set surface greatly completed with stemming.
3. the furnace charge method of replacing under a kind of blast furnace accident condition according to claim 1, it is characterised in that：Put in air-supply
Change in charge process that send need to be after slag iron be discharged smoothly before cold wind.
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| CN201510650382.7A CN105368995B (en) | 2015-10-10 | 2015-10-10 | A kind of furnace charge method of replacing under blast furnace accident |
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| CN108977601B (en) * | 2017-06-05 | 2020-06-16 | 上海梅山钢铁股份有限公司 | Method for communicating blast furnace tuyere and iron notch |
| EP4151753A4 (en) * | 2020-05-15 | 2023-11-01 | JFE Steel Corporation | Blast furnace operation method |
| CN114807466A (en) * | 2021-01-28 | 2022-07-29 | 上海梅山钢铁股份有限公司 | Method for adjusting and adding furnace charge before long-term damping down of iron-making blast furnace |
| CN115354095B (en) * | 2022-08-14 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Method for treating and preventing serious heat loss of blast furnace hearth |
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| CN102071272B (en) * | 2009-11-24 | 2012-11-21 | 攀钢集团钢铁钒钛股份有限公司 | Method for blowing out blast furnace |
| CN101818221B (en) * | 2010-04-27 | 2011-05-04 | 重庆钢铁(集团)有限责任公司 | Method capable of rapidly reaching yield after small and medium maintenance of blast furnace |
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