CN105368995A - Furnace charge replacement method under blast furnace accident - Google Patents
Furnace charge replacement method under blast furnace accident Download PDFInfo
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- CN105368995A CN105368995A CN201510650382.7A CN201510650382A CN105368995A CN 105368995 A CN105368995 A CN 105368995A CN 201510650382 A CN201510650382 A CN 201510650382A CN 105368995 A CN105368995 A CN 105368995A
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Abstract
The invention discloses a furnace charge replacement method under a blast furnace accident. Blast furnace air supply continues to be carried out through an existing air supply system under the condition that blast furnace top pressure is normal pressure. The area of an air opening is reduced (the air opening is blocked, and the diameter of the air opening is reduced). After air supply, a certain amount of coke is added, then light load materials and clean coke are added at intervals for feeding, and the light load materials are obtained through gradual transition according to the furnace temperature, the furnace condition antegrade condition and the slag iron discharge condition. The furnace temperature is sufficient, discharging is carried out stably and smoothly, the air opening is gradually opened to increase the air blast according to the condition of the furnace top pressure, a work air opening is more than 2/3 of the whole air opening, replacement of heavy load materials is completed, blast furnace temperature is sufficient, and furnace blocking materials start to be fed. Slag iron is treated in a normal production manner, the labor intensity of workers cannot be increased, the workers do not need to enter a blast furnace, and water lifting is avoided. Meanwhile, when air supply restores, the blast furnace is basically filled with coke, air supply restores relatively smoothly, and the probability of bursting cool slag iron through blasting is extremely low. The influence on the service life of the blast furnace is small. Treatment cost is low, treatment time is short, and the influence on production is small.
Description
Technical field
The present invention relates to blast furnace banking method, particularly relate to the furnace charge method of replacing under a kind of blast furnace accident.
Background technology
Because blast-furnace smelting smelts in encloses container under high temperature, high pressure, when generation burst accident, blast furnace must stop production carrying out accident treatment.But be a puzzlement technician's difficult problem to the process of the heavy loading furnace charge in blast furnace always.Existing two kinds of the processing mode of the high temperature heavy loading furnace charge in process blast furnace:
1, blast-furnace tuyere takes off material method: namely with manually from blast-furnace tuyere, the furnace charge of high furnace interior being clawed.There are some shortcomings in this treatment process: the time is long in actually operating, and upper kiloton furnace charge through cooling of fetching water, with artificial from directly clawing from air port, will need time first quarter moon at least, at most the 1-2 month.Work under bad environment, workman at high temperature, high dust atmosphere bottom band material, must affect workman physically and mentally healthy., safety coefficient is low.Workman will enter in stove and take off material, Wall of Blast Furnace bricking, adhesive have come off, under the possibility fallen, protection must be installed additional fluffy, operation in stove of being allowed for access.Reduce blast furnace campaign, owing to will fetch water when clearing up cupola well, water contacts with refractory brick, particularly brick fuel, reduces refractory brick work-ing life, and blast furnace reduces to normal temperature state by the condition of high temperature simultaneously, generation expand with heat and contract with cold cause brick body, steel construction deforms, affect one-piece construction and stablize.Processing costs is high, and establishment officer takes off material, by the transport processing filling fluffy, the upper kiloton material of safety, expend more cost
2, direct banking method: to be exactly do not process the heavy burden in stove, directly carry out banking process, blast furnace hearth freeze-up must occur, hearth freeze-up has blast furnace harm, and air-supply is long for time of recovery.After blast furnace generation hearth freeze-up, blast furnace internal temperature is low, airtight, drum not air intake.Blast furnace must block up air port, progressively slow windward, progressively melts the cool furnace charge of high furnace interior, and the time is at least about January, the several months at most.Cost and height.Blast furnace process hearth freeze-up, because gas utilize is poor, add a large amount of coke and carry out heating furnace, the cool slag iron of kiloton in fusing, and the slag iron simultaneously melted, by not using, can only be discarded, or again process, process hearth freeze-up cost and height.Affect blast furnace campaign.Blast furnace generation hearth freeze-up, iron mouth, not out of iron, must burn iron mouth with oxygen, and carry out explosion, the furnace charge in fried loose cupola well, allows the descending heating cupola well of coal gas of high temperature.Carry out burning iron mouth, explosion treatment, must destroy brick lining in blast furnace chamber, shorten blast furnace campaign, financial loss is huge.Labour intensity is large.A large amount of cool slag iron is discharged from iron mouth and is piled up in stokehold, needs labor cleaning.During hearth freeze-up process, air port is easily filled with slag and burns out simultaneously, must damping down manual handling.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention aims to provide the furnace charge method of replacing under a kind of blast furnace accidental state
The present invention is achieved by following technical solution:
A furnace charge method of replacing under blast furnace accidental state, the steps include:
1) process iron mouth: be adjusted to minimum by iron bicker degree, and burn with oxygen rifle Jiang Tiekou and air port logical, burn after leading to and bury oxygen rifle underground in iron mouth;
2) furnace charge in the cupola well of inlet front end is processed: the furnace charge before cleaning air port is burnt to show, to leave behind air port above iron mouth and two covers, and 4 other for iron mouth air ports are burnt logical mutually, burn logical after in air port, add aluminium ingot and Industrial Salt, then the punching of not blowing is clean and block.
3) air port area is adjusted: reduced by existing tuyere diameter before air-supply, if blast furnace is heavy loading, then block 3/4 with uptake;
4) air-supply displacement furnace charge: close the large lock of cold wind and variable valve, hot-blast pressure is adjusted to and is less than 40kpa air-supply, intersect after backward blast furnace of blowing adds clean coke and add clean coke and light load material, light load material is added after furnace temperature is greater than 700 DEG C and progressively rises, open the large lock of cold wind slowly regulate cold air adjusting valve after adding light load material, after heavy burden is replaced furnace temperature be greater than 1450 DEG C, air quantity level reach normal production time 40% time add banking material;
5) hydraulic pressure is recovered: air port hydraulic pressure is recovered normal;
6) discharging slag iron: extract oxygen rifle and beat tapping outlet, goes out scum only and starts damping down.
During furnace charge in the cupola well processing inlet front end, all air ports two need be overlapped, overlap greatly surface stemming and complete.
Need to carry out oxygen-enriched coal spray in time in air-supply displacement charge process.
Need after the discharge smoothly of slag iron send cold wind in air-supply displacement charge process before.
The invention has the beneficial effects as follows:
Compared with prior art, the furnace charge method of replacing under a kind of blast furnace accidental state provided by the invention will be by blowing to blast furnace by existing supply air system is continued to reduce air port area under blast furnace normal pressure tip layering part.Add the coke of some amount after air-supply, then interval adds light load material and clean Jiao and carries out material loading and displace heavy loading furnace charge.Have the following advantages:
1, the time processing heavy burden is short.When there is burst accident, blast furnace is still in the working order of a high temperature, slag iron good fluidity.Now by short period of time damping down process, continued to blast furnace air-supply (because coal gas system has an accident by gas blower, coal gas can only diffuse) and tap a blast furnace, furnace top pressure keeps normal pressure, blast furnace continues to load light load furnace charge and the heavy loading furnace charge in blast furnace is replaced, after improving furnace temperature, load banking material, then carry out blowing out treatment facility accident.This technical finesse time comparatively takes off material and greatly shortens.During blast furnace air-supply simultaneously, because furnace interior fills banking material (being coke substantially entirely), high air-supply is relatively smooth.
2, labor strength is low: after accident occurs, and blast furnace is at short period of time multiple wind, and blast furnace heat is in Warm status, and slag iron good fluidity, still can discharge smoothly, and blast furnace discharge yard still by mode process during normal production, can realize slag sluicing system, reclaim molten iron.Labor strength can not obviously increase the weight of
3, little on impact blast furnace campaign: this technology is when processing heavy burden, and workman does not enter high furnace interior bar material, does not exist and fetches water.When air-supply recovers simultaneously, be planned prepared (plan banking), high furnace interior is coke substantially entirely, and air-supply recovers relatively smooth, blows out the probability of fried cool slag iron and low.Little on impact blast furnace campaign.
4, processing cost is relatively low.This technology is to heavy burden in blast furnace during process burst accident, and because the time is short, difficulty is low.Therefore expense is relatively less.
Embodiment
Below technical scheme of the present invention is described further, but described in required protection domain is not limited to;
Furnace charge method of replacing under a kind of blast furnace accidental state provided by the invention, the steps include:
1) process iron mouth: be adjusted to minimum by iron bicker degree, and burn with oxygen rifle Jiang Tiekou and air port logical, burn after leading to and bury oxygen rifle underground in iron mouth;
2) furnace charge in the cupola well of inlet front end is processed: the furnace charge before cleaning air port is burnt to show, to leave behind air port above iron mouth and two covers, and 4 other for iron mouth air ports are burnt logical mutually, burn logical after in air port, add aluminium ingot and Industrial Salt, then the punching of not blowing is clean and block.
3) air port area is adjusted: reduced by existing tuyere diameter before air-supply, if blast furnace is heavy loading, then block 3/4 with uptake;
4) air-supply displacement furnace charge: close the large lock of cold wind and variable valve, hot-blast pressure is adjusted to and is less than 40kpa air-supply, intersect after backward blast furnace of blowing adds clean coke and add clean coke and light load material, light load material is added after furnace temperature is greater than 700 DEG C and progressively rises, open the large lock of cold wind slowly regulate cold air adjusting valve after adding light load material, after heavy burden is replaced furnace temperature be greater than 1450 DEG C, air quantity level reach normal production time 40% time add banking material;
5) hydraulic pressure is recovered: air port hydraulic pressure is recovered normal;
6) discharging slag iron: extract oxygen rifle and beat tapping outlet, goes out scum only and starts damping down.
During furnace charge in the cupola well processing inlet front end, all air ports two need be overlapped, overlap greatly surface stemming and complete.
Need to carry out oxygen-enriched coal spray in time in air-supply displacement charge process.
Need after the discharge smoothly of slag iron send cold wind in air-supply displacement charge process before.
Embodiment: after water steel No. 3 blast furnace generation coal gas system accidents, need damping down 72 hours,
Operative employee first adjusts air port area.Before air-supply, existing tuyere diameter is reduced.(in order to realize windy mouth work, enlivening 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.
Furnace charge in the cupola well of reprocessing inlet front end.Pluck out measuring slag iron before whole air port, show is burnt.Left behind in air port above iron mouth and two covers, down burn and be communicated with iron mouth.Air port, 4, Tie Kou both sides is burnt logical mutually.After burned, add aluminium ingot and Industrial Salt, to improve before air port temperature and reduce slag viscosity, improving slag iron mobility, avoid burning out air port and two covers.The air port of not blowing is scratched clean stifled mud again, automatically blow open after not allowing air-supply.All air ports two are overlapped, overlap greatly surface stemming completes, and prevents from burning to burn out large cover, two covers.
Process iron mouth.Before air-supply, iron bicker degree is adjusted to minimum, and to oxygen burning iron mouth, strives that iron one's intention as revealed in what one says mouth is ganged up.Before air-supply, iron mouth buries oxygen rifle, and logical upper oxygen, ensure that it burns.
Air-supply displacement furnace charge.The air-supply initial stage presses blast operation, and hot-blast pressure is by being not more than 40kpa air-supply, the large lock of complete shut-down cold wind and variable valve.Apparent wind mouth is bright, no swell slag phenomenon, blanking is normal, pressure magnitude relation is symmetrical, peripheral system is normal, could progressively windward after the discharge smoothly of slag iron.When making air quantity reach production air quantity more than 40%.Carry out a small amount of oxygen-enriched coal spray when adding load material at every turn, accelerate to improve furnace temperature.Upper blast furnace first adds the clean coke of some amount, then adds the transition of light load furnace charge.Heavy loading furnace charge is replaced.Large more than 1450 DEG C of blast-melted temperature.Air quantity level reaches more than 40%.Loading banking material can be carried out, carry out banking operation.
The cool slag iron of casting house process.According to sending oxygen amount, and the air-supply time, determine to extract oxygen rifle, bore tapping outlet.If iron mouth is airtight, not feeder fire, tissue burns, till grilling thoroughly gas above iron mouth.Each iron mouth goes out first time iron, and slag iron is sand mouth only, and follow-up sand mouth of whether crossing is determined according to physical thermal, and when temperature is greater than 1440 DEG C, slag iron reaches more than 80t can cross sand mouth.According to practical situation, the fastest speed pours out the cool iron of cool slag to the greatest extent.
Hydraulic pressure recovers.Before air-supply, shaft cooling system flow, by 1/2 controlling during normal production, according to water temperature difference practical situation after air-supply, when water temperature difference is large and the normal water temperature difference 50%, can recover the normal water yield.Before air-supply, air port water recovers normal hydraulic pressure and flow.
Claims (4)
1. the furnace charge method of replacing under blast furnace accidental state, the steps include:
1) process iron mouth: be adjusted to minimum by iron bicker degree, and burn with oxygen rifle Jiang Tiekou and air port logical, burn after leading to and bury oxygen rifle underground in iron mouth;
2) furnace charge in the cupola well of inlet front end is processed: the furnace charge before cleaning air port is burnt to show, to leave behind air port above iron mouth and two covers, and 4 other for iron mouth air ports are burnt logical mutually, burn logical after in air port, add aluminium ingot and Industrial Salt, then the punching of not blowing is clean and block.
3) air port area is adjusted: reduced by existing tuyere diameter before air-supply, if blast furnace is heavy loading, then block 3/4 with uptake;
4) air-supply displacement furnace charge: close the large lock of cold wind and variable valve, hot-blast pressure is adjusted to and is less than 40kpa air-supply, intersect after backward blast furnace of blowing adds clean coke and add clean coke and light load material, light load material is added after furnace temperature is greater than 700 DEG C and progressively rises, open the large lock of cold wind slowly regulate cold air adjusting valve after adding light load material, after heavy burden is replaced furnace temperature be greater than 1450 DEG C, air quantity level reach normal production time 40% time add banking material;
5) hydraulic pressure is recovered: air port hydraulic pressure is recovered normal;
6) discharging slag iron: extract oxygen rifle and beat tapping outlet, goes out scum only and starts damping down.
2. the furnace charge method of replacing under a kind of blast furnace accidental state according to claim 1, is characterized in that: during furnace charge in the cupola well processing inlet front end, all air ports two need be overlapped, overlap greatly surface stemming and complete.
3. the furnace charge method of replacing under a kind of blast furnace accidental state according to claim 1, is characterized in that: need to carry out oxygen-enriched coal spray in time in air-supply displacement charge process.
4. the furnace charge method of replacing under a kind of blast furnace accidental state according to claim 1, is characterized in that: need after the discharge smoothly of slag iron send cold wind in air-supply displacement charge process before.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977601A (en) * | 2017-06-05 | 2018-12-11 | 上海梅山钢铁股份有限公司 | A kind of method of unchoking blast furnace tuyere and iron mouth |
| 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 |
| CN115354095A (en) * | 2022-08-14 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Method for treating and preventing serious heat loss of blast furnace hearth |
| CN115516113A (en) * | 2020-05-15 | 2022-12-23 | 杰富意钢铁株式会社 | Blast furnace operation method |
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| CN102071272A (en) * | 2009-11-24 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for blowing out blast furnace |
| CN101818221A (en) * | 2010-04-27 | 2010-09-01 | 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977601A (en) * | 2017-06-05 | 2018-12-11 | 上海梅山钢铁股份有限公司 | A kind of method of unchoking blast furnace tuyere and iron mouth |
| CN115516113A (en) * | 2020-05-15 | 2022-12-23 | 杰富意钢铁株式会社 | Blast furnace operation method |
| CN115516113B (en) * | 2020-05-15 | 2024-05-14 | 杰富意钢铁株式会社 | Method for operating blast furnace |
| 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 |
| CN115354095A (en) * | 2022-08-14 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Method for treating and preventing serious heat loss of blast furnace hearth |
| 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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