CN102399926B - Furnace halt residue iron outlet method for middle and large-sized blast furnaces - Google Patents
Furnace halt residue iron outlet method for middle and large-sized blast furnaces Download PDFInfo
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- CN102399926B CN102399926B CN2011103705462A CN201110370546A CN102399926B CN 102399926 B CN102399926 B CN 102399926B CN 2011103705462 A CN2011103705462 A CN 2011103705462A CN 201110370546 A CN201110370546 A CN 201110370546A CN 102399926 B CN102399926 B CN 102399926B
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Abstract
The invention discloses a furnace halt residue iron outlet method for middle and large-sized blast furnaces, which comprises the following steps that: positions of double residue iron openings are determined at one side near an iron way; the residue iron openings and an iron outlet groove are made during the advanced wind stop; an iron tank used for accommodating the residue iron is matched and arranged on the iron way at the same side as the residue iron openings; and during the residue iron outlet, firstly, the residue iron opening in a high position is burnt to an open state through oxygen, and when the iron flow becomes small, the residue iron opening in a lower scale height position is burnt to an open state for residue iron outlet. When the method is adopted for furnace halt residue iron outlet, the safe and fast furnace halt can be realized, in addition, slag iron mixtures remained in a furnace cylinder are greatly reduced after the furnace halt, and the labor, material and money consumption is reduced for cleaning the residue in the furnace cylinder.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, specifically, the present invention relates to a kind of method that blowing out that not only had been applicable to smelt the medium-and-large-sized blast furnace of high-titanium type vanadium-titanium magnetite but also had been applicable to smelt the large blast furnace in common ore deposit goes out residual iron.
Background technology
For medium-and-large-sized blast furnace ironmaking, no matter be to smelt common ore deposit or smelt vanadium titano-magnetite, to produce through a generation after furnace life, blast furnace is in latter stage in furnace life, and body of heater is aging.The aging of blast furnace is usually expressed as: often rubescent, iron mouth degree of depth difficulty rises, iron mouth qualification rate reduces, bottom temperature raises for cooling apparatus badly broken, stove skin many places cracking, stove skin, these all make the normal operation ratio of blast-furnace equipment reduce, and have influence on the normal safety in production of blast furnace.Add chemical erosion and the mechanical erosion effect of high temperature sludge iron liquid to cupola well and bearth brick lining for many years, the cupola well volume that form latter stage blast-furnace production campaign increases, and has accumulated a large amount of slag iron.In view of the foregoing, all need to carry out blowing out blast furnace is carried out large repairs, important process during blowing out is the residual iron that need to go out in clean cupola well.
In order to judge whether the residual iron in cupola well goes out only, usually, after blowing out, in cupola well remaining slag iron mixture the number be to weigh whether thoroughly one of important symbol of blowing out.At present, for example, for medium-and-large-sized blast furnace (, 1200m
3or 1350m
3the blast furnace of smelting high-titanium type vanadium-titanium magnetite) carrying out the blowing out overhaul advances, usually adopt a residual iron mouth to be gone out residual iron, and the position of residual iron mouth is chosen in railway line one side usually, becomes the angle of 90 degree at the cooling fireplace skin of first paragraph with the iron mouth, and carry out out the preparation work of residual iron.Then, blast furnace is hanged down to the stockline blowing down in advance; Gas recovery not when empty stockline; Shaft is passed into to N
2and to the furnace roof spray cooling; The deep space stockline, below air port, is finally gone out residual iron, adopts top method to go out residual iron, and the residual iron amount at every turn gone out is approximately 100 tons of left and right, and the residual iron amount gone out with Theoretical Calculation differs more than one times; The most outstanding defect be to middle and later periods of tapping a blast furnace can not go out to the greatest extent by the residual iron cupola well internal mobility is poor, that physical thermal is low, thereby furnace outage time is extended, owing to causing remaining solidifying iron in a large number in cupola well after blowing out, and the envrionment temperature of cupola well is high, do not go out clean slag, Jiao, solidifying iron is formed plate, therefore causes cupola well cleaning work within the time of plan not carry out on time.And, also to blow out and explode residual iron with explosive when cupola well is cleared up the middle and later periods, therefore, typically, the slag iron mixture in cupola well is thoroughly cleaned out the time that needs 6～7 days, thereby made the overhaul time lengthening, thereby the cost of overhaul is raise.
For the blast-furnace smelting of high-titanium type vanadium-titanium magnetite, the investigation through all previous blast furnace stopping to breakage of furnace body proves: due to the singularity of high-titanium type vanadium-titanium magnetite blast-furnace smelting, contain TiO in slag
2higher, be generally 21%～22%, in long-term smelting production process, in the cupola well zone due to TiO
2cross reduction and have a large amount of TiC, TiN and Ti (C, the high-melting-point adhesive such as N), therefore after blowing out, be deposited in the burnt mixture of slag, while going out residual iron, make the flow velocity of molten iron reduce, make will the flow through resistance increment of residual iron mouth of molten iron, path is relatively elongated, thereby causes the amount of the cupola well residue that deposits after blowing out large.
Summary of the invention
The present invention is intended to solve to smelt the problem that the blast furnace of high-titanium type vanadium-titanium magnetite exists when blowing out, therefore, the invention provides a kind of blast furnace that is applicable to smelt high-titanium type vanadium-titanium magnetite and can effectively go out the method for residual iron when blowing out.
The invention provides a kind of blowing out for the blast furnace of smelting high-titanium type vanadium-titanium magnetite and go out residual iron method, described blowing out goes out residual iron method and comprises the following steps: the position of determining two residual iron mouths in the side near railway line; When blowing down in advance, make residual iron mouth and casting house; On the railway line with residual iron mouth homonymy, be equipped with for holding the iron flask of residual iron; While going out residual iron, first by the absolute altitude position, high residual iron mouth is boiled with oxygen, and when flowing molten iron diminishes, then by the absolute altitude position, low residual iron mouth is boiled is gone out residual iron, thereby goes out residual iron process while completing blast furnace stopping.
According to an aspect of the present invention, a residual iron mouth in described two residual iron mouths is arranged on a side of the railway line of joining slag ladle, and another residual iron mouth is arranged on a side of the railway line of joining iron flask.
According to an aspect of the present invention, the step of the position of described definite two residual iron mouths comprises: the position of selecting two residual iron mouths in the both sides of blast furnace; Then, according to the bottom temperature of blast furnace both sides, hearth erosion thickness and stove skin temperature are determined the absolute altitude position of described two residual iron mouths.
According to an aspect of the present invention, the bottom temperature by the blast furnace both sides utilizes Mo Yixunke formula X=D/k * l/u * lg (tl/t) to determine hearth erosion thickness, and wherein, X means the residual thickness of furnace bottom.Unit is mm (or m); D means the diameter of blast furnace hearth, and unit is mm (or m); Unit is m; K is for being not 2.36 (looking into Moshi curve can obtain) according to coefficient, l/u=l/lge=2.3026; Tl means the molten iron temperature of iron mouth medullary ray, and unit is ℃; T means bottom temperature, and unit is ℃.According to the present invention, the residual thickness that total furnace bottom thickness by blast furnace deducts furnace bottom obtains hearth erosion thickness, then, determine the theoretical absolute altitude position of residual iron mouth according to the corroding thickness of the residual iron mouth absolute altitude position of blast furnace and cupola well, according to the stove skin temperature of Blast Furnace Bottom both sides, the theoretical absolute altitude position of residual iron mouth is proofreaded and revised again, wherein, elect the high position of stove skin temperature as residual iron mouth that absolute altitude is high, elect the position of stove skin time high some temperature as residual iron mouth that absolute altitude is low.
According to an aspect of the present invention, the step of the residual iron mouth of described making and casting house is: during blowing down in advance, by residual iron mouth select location, cut open the stove skin, set the pre-iron notch of pre-sizing, fill out asbestos twine between stove skin and cooling stave simultaneously; Get well and dry the ditch of the residual iron of stream with the ditch backing strap of refractory mortar and pad ditch; Build complete casting house, on railway, prepare the iron flask of the residual iron of splendid attire simultaneously, install the connection groove between iron flask, the guiding molten iron flows into iron flask; When stockline is down to predetermined height, remove the bottom brick of predetermined depth, carry out iron mouth mud cover, the degree of depth is no less than 400mm, thereby completes out the preparatory condition before residual iron.
Blowing out according to the present invention goes out the method for residual iron, is not only applicable to smelt the large blast furnace in common ore deposit, and is applicable to smelt the medium-and-large-sized blast furnace of high-titanium type vanadium-titanium magnetite.
Adopt method of the present invention to carry out blowing out and go out residual iron, can realize blowing out safely and fast, and make to remain in slag iron mixture in cupola well after blowing out and reduce in a large number, for removing residue in cupola well, reduced human and material resources, financial resources consumption.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of determining the position of residual iron mouth according to of the present invention
Embodiment
The present invention is by adopting when the medium-and-large-sized blast furnace stopping two residual iron mouths to be gone out residual iron, can make total furnace outage time shorten 2 hours, after blowing out, settling in cupola well reduces (being mainly that solidifying iron reduces) in a large number, and the residual iron amount gone out increases, the actual iron amount and the theory amount of tapping a blast furnace that go out are more approaching, after blowing out the settling time of cleaning in cupola well by within 7 days, shortening to 3 days～4 days, thereby created favourable condition for the blast furnace maintenance reduction of erection time.It is pointed out that residual iron mouth refers to the outlet that is used for discharging residual iron on blast furnace here.
Below with reference to Fig. 1, describe the method that the blowing out for medium-and-large-sized blast furnace according to the present invention goes out residual iron in detail.Fig. 1 is the schematic diagram of determining the position of residual iron mouth according to of the present invention
The method that blowing out for medium-and-large-sized blast furnace according to the present invention goes out residual iron comprises the step that next coming in order are carried out: the position of determining the two residual iron mouth that the absolute altitude position is different; When blowing down in advance, make residual iron mouth and casting house; On the railway line with these two residual iron mouth homonymies, equipped iron flask is used in order to filling residual iron; While going out residual iron, first by the absolute altitude position, high residual iron mouth is boiled with oxygen, treats that flowing molten iron is shown in hour, and then by the absolute altitude position, low residual iron mouth is boiled is gone out residual iron, wherein, according to stokehold, puts the slag situation, rationally controls the rhythm that taps a blast furnace of the stokehold iron mouth in furnace shutting down process.
Specifically, go out the method for residual iron in the blowing out for medium-and-large-sized blast furnace according to the present invention, determine the position of two residual iron mouths by following steps: at first, at the railway line of being convenient to be equipped with the iron flask for holding residual iron, select the position of two residual iron mouths near the homonymy of railway line; Then, determine the absolute altitude position of two residual iron mouths according to bottom temperature, hearth erosion thickness and the stove skin temperature of blast furnace both sides.
Usually, for medium-and-large-sized blast furnace, near railway line it divides two, article one, be the railway line of joining slag ladle, another is the railway line of joining iron flask, and wherein, these two railway lines are parallel to each other, a contrary side (opposite location herein refers to the both sides centered by the cupola well (furnace foundation) by blast furnace, the i.e. position opposite of residual iron mouth).According to the present invention, go out residual iron when utilizing two residual iron mouths to carry out blast furnace stopping, wherein, a residual iron mouth is to join a side of the railway line of slag ladle when blast furnace is normally produced; Another residual iron mouth is to join a side of the railway line of iron flask when blast furnace is normally produced, and as shown in Figure 1, therefore, according to the present invention, two residual iron mouths is set, and these two residual iron mouths are positioned at the both sides respect to one another of blast furnace.Therefore, as mentioned herein " blast furnace both sides " refer to that being positioned at of blast furnace join near the side railway line of joining iron flask that is positioned at of near the side railway line of slag ladle and blast furnace.
The step of determining two residual iron mouth absolute altitudes position according to of the present invention will be described in detail belows.
According to embodiments of the invention, calculate the hearth erosion thickness X according to the bottom temperature t of blast furnace, and utilize infrared thermometer to measure the stove skin temperature of Blast Furnace Bottom both sides, by the hearth erosion thickness by calculating and the stove skin temperature recorded, the two combines to determine the absolute altitude position of two residual iron mouths.Specifically, utilize Mo Yixunke formula (following formula 1) to calculate the corroding thickness of cupola well according to the bottom temperature of blast furnace.
[formula 1]
X＝D/k×l/u×lg(tl/t)
In superincumbent formula 1: X means the residual thickness of furnace bottom, and unit is mm or m; D means the diameter of blast furnace hearth, and unit is mm or m; K is not for according to coefficient (looking into Moshi curve can obtain), k=2.36, l/u=l/lge=2.3026; Tl means the molten iron temperature of iron mouth medullary ray, and unit is ℃; T means bottom temperature, and unit is ℃.
Then, residual thickness X by the furnace bottom that calculates determines hearth erosion thickness (residual thickness of hearth erosion thickness=furnace bottom total thickness-furnace bottom), and then determine the position of residual iron mouth according to hearth erosion thickness, thereby obtain the theoretical absolute altitude position of residual iron mouth.Simultaneously, according to the stove skin temperature (highs and lows) of furnace bottom both sides, the theoretical absolute altitude position of the residual iron mouth that obtains is proofreaded and revised, thereby obtain the actual elevation position of residual iron mouth, wherein, elect the high position of stove skin temperature as residual iron mouth that absolute altitude is high, elect the position of stove skin time high some temperature as residual iron mouth that absolute altitude is low.Here, " absolute altitude " refers to that the railway line of take under the blast furnace roadbed is zero rice, and iron mouth (or residual iron mouth) medullary ray is to the vertical range of railway line.
For the present invention is described better, the method for determining two residual iron mouth absolute altitude positions according to of the present invention is described below by concrete example.
Suppose certain 1200m
3blast furnace has been produced 10 years, the absolute altitude position of blast furnace taphole is 9.0m, cupola well diameter D is 8.2m, prepare the blowing out overhaul, wherein, the structure of furnace bottom is clay brick, the ladle heel layer height is 800mm, totally ten layers of clay bricks, the thickness of every layer of clay brick is 400mm, the total thickness of furnace bottom is 400 * 10=4000mm.Measure respectively the temperature of 6 positions of Blast Furnace Bottom, obtain following table 1.It should be noted that, these 6 some bottom temperatures are selected according to the representational temperature value of cupola well circumferential direction.
The Bottom Temperature that table 1 is measured
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | Mean value |
| Bottom temperature (℃) | 811 | 810 | 396 | 612 | 549 | 383 | 593.5 |
The molten iron temperature of measuring iron mouth medullary ray is that tl is 1400 ℃, and the medial temperature t of furnace bottom is 593.5 ℃.Then, utilize the residual thickness of Mo Yixunke formula calculating furnace bottom as follows:
X＝8.2/2.36×2.3026×lg(1400/593.5)＝2.982m
So hearth erosion thickness is: the residual thickness=4-2.982=1.018m of furnace bottom total thickness-furnace bottom.Therefore, the position of residual iron mouth should be below the medullary ray of iron mouth the position of 1.018+0.8=1.818m, so residual Tie Kou position absolute altitude is 9-1.818=7.182m.
According to the stove skin temperature (vertex and time high point) of infrared thermometer mensuration furnace bottom both sides, residual Tie Kou position absolute altitude is proofreaded and revised again simultaneously, thereby high set positions is the residual iron mouth that absolute altitude is high by stove skin temperature, by stove skin temperature, low set positions is the residual iron mouth that absolute altitude is low.
Although the above has described the concrete steps of determining the position of two residual iron mouths, the invention is not restricted to this.Those skilled in the art can, under instruction of the present invention, determine the position of two residual iron mouths at the railway line of blast furnace both sides according to practical situation.
In addition, according to the present invention, also need to determine according to the residual iron amount in blast furnace the number of the iron flask configured on railway line.Specifically, utilize following formula 2 to determine the residual iron amount in it according to each parameter of blast furnace.
[formula 2]
In superincumbent formula 2, T means residual iron amount, and unit is ton; D means the diameter of blast furnace hearth, and unit is m; H means the depth of erosion of cupola well, and unit is m; K is a coefficient, and span, between 0.4～0.65, is determined the k value according to the erosion degree (corresponding to the corroding thickness of cupola well) of cupola well, corrodes capping when serious; R means the proportion of molten iron, and its value is 7.0 tons/m
3.
According to one exemplary embodiment of the present invention, suppose that certain blast furnace produced 10 years, the cupola well diameter is 8.2m, 1.3 meters of the hearth erosion degree of depth can obtain residual iron amount according to formula 2 as follows:
Usually, the capacity of each iron flask is 90～100 tons, therefore, according to above calculated value, need to join iron flask and be no less than 4, for safety, considers to also have a small amount of slag to flow out, and two residual iron mouths are all by 2 iron flask configurations.
Go out the method for residual iron in the blowing out for medium-and-large-sized blast furnace of the present invention, the step of making residual iron mouth and casting house is as follows: during blowing down in advance, cut open the stove skin according to residual iron mouth select location, the pre-iron notch of pre-sizing is set, fill out asbestos twine between the stove skin by tapping and cooling stave simultaneously; Then, get well and dry the ditch of the residual iron of stream with the ditch backing strap of refractory mortar and pad ditch; Improve and build complete casting house, prepare the iron flask of the residual iron of splendid attire simultaneously on railway, install the connection groove between iron flask, the guiding molten iron flows into iron flask; When stockline is down to certain altitude, the bottom brick at residual iron mouth place is removed to the predetermined degree of depth, carry out iron mouth mud cover, the degree of depth is no less than 400mm, thereby completes out the preparation before residual iron.
According to the present invention, the size of pre-iron notch can arrange according to the specification of blast furnace.Specifically, for 1200～2000m
3blast furnace, open the pre-iron notch of 600mm * 600mm, and the heat size I is with suitably smaller, and heat size greatly can be suitably larger, take that to ensure safety and conveniently go out residual iron and make iron mouth mud cover be prerequisite.According to the present invention, the ditch that flows residual iron is to make by fire-resistant ditch backing strap system and on the steel tank of laying fireproof bricks, because refractory brick and this bi-material of ditch material all contain a small amount of moisture, and the ditch that contains moisture is easily blasted when meeting high temperature liquid iron, so for the safety of tapping a blast furnace must be dried ditch, to remove moisture.According to the present invention, for the blast furnace of bell furnace top, adopt the clock-type cloth, stockline refers to the vertical range of the lower edge of great bell unlatching to the interior charge level of stove; For without the clock furnace roof, with the blast furnace of chute cloth, stockline refers to lower edge when chute the is vertical vertical range to charge level in stove.
According to the present invention, for example, when stockline is down to certain altitude (, being 12 meters), blast furnace carries out blowing down in advance, during damping down, removes inwards the bottom brick of predetermined depth (for example, being 150mm) from previously selected residual iron mouth, then carries out iron mouth mud cover.Specifically, with refractory mortar by the hole of the residual iron mouth place degree of depth (for example, the degree of depth is 150mm, the hole that width is 600mm) compacting, compression, fill up the gap between stove skin and iron mouth compress, and outwards form a boss, total depth is approximately 400mm, scratching a diameter at center is the circular hole that 80mm, the degree of depth are 300mm, and dries moisture, makes it have certain hardness.Therefore, according to the present invention, iron runner and residual iron mouth join, and the gradient is 10～12 degree, and wide is 800～900mm, and the degree of depth is 300～400mm, and joins with the iron flask be configured on railway line, thereby when going out residual iron, allows molten iron flow to smoothly iron flask.
Go out the method for residual iron in the blowing out for medium-and-large-sized blast furnace of the present invention, on the railway line with residual iron mouth homonymy, the assembling iron flask with for filling residual iron, and puts the iron flask configuration in place, installs the connection casting runner groove between iron flask simultaneously, thereby possesses the condition of tapping a blast furnace.
Go out the method for residual iron in the blowing out for medium-and-large-sized blast furnace of the present invention, hour (while going out residual iron, first by the absolute altitude position, high residual iron mouth is boiled with oxygen, treats that flowing molten iron is shown in, when the flow of flowing molten iron diminishes), and then by the absolute altitude position, low residual iron mouth is boiled is gone out residual iron.
In the present invention, put the slag situation according to stokehold, during blowing out, the cinder notch of stokehold is in slagging, the slag of discharging from cinder notch be slag, if the process of slag finds that cinder notch has a small amount of ornamental work of iron ejection on discharging, explanation be melted in molten iron in cupola well need to be from the discharge of iron mouth, ensure thus cinder notch safety (because cinder notch is copper sheathing, interior logical recirculated water, the iron mouth is that refractory mortar forms), thus stokehold Tie Kou in the furnace shutting down process rhythm that taps a blast furnace rationally controlled.The tap a blast furnace step of rhythm of control is as follows: in order to reduce the workload of cleaning cupola well residue after blowing out, take suitably to reduce the method for the number of casts in the empty stockline process of blowing out, especially last iron is apart from the timed interval proper extension of a front iron, can make in cupola well to store a certain amount of slag iron, stock column can be raised like this, make coke as far as possible in air port and air port above position burning.After the above coke in air port fully burns, organize again stokehold Tie Kou to go out last iron, thereby control the rhythm that taps a blast furnace, the tap a blast furnace reason of rhythm of control is as follows: the above coke in air port is after abundant burning, provide heat to make the slag iron good fluidity of fusing simultaneously, because arriving the blowing out later stage, the furnace heat loss is larger, and the amplitude that the temperature of molten iron temperature and slag reduces is very fast; The lowering speed of furnace charge blasts the air quantity combustion of coke by air port and completes, during blowing out, blast the air quantity in air port, because blast is pressed much larger than top, so the gas Rapid Flow is toward upper blast furnace, generally can only be to the coke sufficient combustion more than air port, below air port, particularly the coke at slag iron interface is nonflammable.Therefore, in furnace shutting down process, if the stokehold number of casts is many, the remaining slag iron of cupola well is with regard to less and the coke immersed in slag iron will increase, and the slagging card that taps a blast furnace is burnt serious, causes last stokehold to go out slag iron not to the utmost, makes the workload increase of cleaning cupola well after blowing out; Therefore, by above method, can make coke fully burn, coke residual after blowing out is less, the mobility that kept of slag iron that simultaneously provides heat to make fusing, be convenient to stokehold iron mouth and residual iron mouth and discharge, and remains in so residual iron and slag Jiao mixture in cupola well after blowing out and understand less.
Blowing out according to the present invention goes out the method for residual iron, is not only applicable to smelt the large blast furnace in common ore deposit, and is applicable to smelt the medium-and-large-sized blast furnace of high-titanium type vanadium-titanium magnetite.
Specifically, for the large blast furnace of smelting common ore deposit, generally, along with the increase of heat size, the cupola well diameter also increases thereupon, for example, and for heat size 1200m
3the blast furnace that level is above, the cupola well diameter is all more than 8 meters, 2000m
3the cupola well diameter be 10 meters.Go out residual iron method traditional, adopt a residual iron mouth to tap a blast furnace, the effect of the cooling of fetching water in the relatively long and furnace shutting down process stove in the path of flowing through due to molten iron, the temperature drop of molten iron is very fast, and the amount that molten iron flows iron notch will reduce.After blowing out, cupola well is carried out to the Investigation on damage discovery, residual iron residual in its rightabout cupola well is more, and adopt aforesaid method of the present invention to carry out blowing out, taps a blast furnace, and can make to remain in slag iron mixture in the cupola well circumference after blowing out and reduce in a large number.Safe during blowing out, as to go out efficiently clean cupola well residual iron, make a large amount of minimizing of residue in cupola well, is to weigh one of important symbol whether blowing out is thorough, successful.Therefore, adopt method of the present invention to go out residual iron and can realize blowing out safely and fast, and make to remain in slag iron mixture in cupola well after blowing out and reduce in a large number, for removing residue in cupola well, reduced human and material resources, financial resources consumption.
For the blast-furnace smelting high-titanium type vanadium-titanium magnetite, due to its singularity, contain TiO in slag
2higher, be generally 21%～22%, in long-term smelting production process, in the cupola well zone due to TiO
2cross reduction and have a large amount of TiC, TiN and Ti (C, the high-melting-point adhesive material such as N), therefore after blowing out, be deposited in the burnt mixture of slag, while going out residual iron, make the flow velocity of molten iron reduce, make will the flow through resistance increment of residual iron mouth of molten iron, path is relatively elongated, thereby causes the cupola well residue amount that deposits after blowing out large, simultaneously, a blast furnace production generation is after furnace life, the refractory brick of cupola well and furnace bottom corrodes comparatively serious, the remaining residual iron amount of cupola well is along with the time increases gradually, go out residual iron method traditional, adopt a residual iron mouth to tap a blast furnace, but because the solidifying iron at cupola well circumference and the rightabout area deposition of residual iron mouth is more, the man power and material that the cleaning work of cupola well residue consumes is larger, cause the overhaul time lengthening, the cost of overhaul is raise, according to another embodiment of the present invention, by adopting aforesaid method of the present invention, a residual iron mouth respectively is set in the both sides of blast furnace railway line, thereby when blowing out is tapped a blast furnace, can make residual molten iron in blast furnace flow out rapidly, thereby can make to remain in slag iron mixture in the cupola well circumference reduces in a large number.Therefore, adopt method of the present invention to go out residual iron and can realize blowing out safely and fast, and make to remain in slag iron mixture in cupola well after blowing out and reduce in a large number, for removing residue in cupola well, reduced human and material resources, financial resources consumption.
Those skilled in the art are noted that can make various modifications and change in the present invention in the situation that do not break away from the spirit or scope of the present invention.Therefore, the invention is intended to cover modification of the present invention and change, as long as these modifications and change fall in the scope of claims and equivalent thereof.
Claims (3)
1. the blowing out for medium-and-large-sized blast furnace goes out the method for residual iron, it is characterized in that the method that described blowing out goes out residual iron comprises the following steps:
Determine the position of two residual iron mouths in the side near railway line, wherein, a residual iron mouth in described two residual iron mouths is arranged on a side of the railway line of joining slag ladle, and another residual iron mouth is arranged on a side of the railway line of joining iron flask;
When blowing down in advance, make residual iron mouth and casting house;
On the railway line with residual iron mouth homonymy, be equipped with for holding the iron flask of residual iron;
While going out residual iron, first by the absolute altitude position, high residual iron mouth is boiled with oxygen, and when flowing molten iron diminishes, then by the absolute altitude position, low residual iron mouth is boiled is gone out residual iron, thereby goes out residual iron process while completing blast furnace stopping,
Wherein, describedly determine that the step of the position of two residual iron mouths comprises: the position of selecting pair residual iron mouths in the both sides of close the railway line of blast furnace; Then, determine the absolute altitude position of described two residual iron mouths according to bottom temperature, hearth erosion thickness and the stove skin temperature of blast furnace both sides,
Wherein, the bottom temperature by the blast furnace both sides utilizes following formula to determine hearth erosion thickness,
X＝D/k×1/u×lg(t1/t)
Wherein, X means the residual thickness of furnace bottom, and unit is mm; D means the diameter of blast furnace hearth, and unit is mm; K is not for according to coefficient; 1/u=2.3026; T1 means the molten iron temperature of iron mouth medullary ray, and unit is ℃; T means bottom temperature, and unit is ℃,
The residual thickness that total furnace bottom thickness by blast furnace deducts furnace bottom obtains hearth erosion thickness, then, determine the theoretical absolute altitude position of residual iron mouth according to the corroding thickness of the residual iron mouth absolute altitude position of blast furnace and cupola well, according to the stove skin temperature of Blast Furnace Bottom both sides, the theoretical absolute altitude position of residual iron mouth is proofreaded and revised again, wherein, elect the high position of stove skin temperature as residual iron mouth that absolute altitude is high, elect the position of stove skin time high some temperature as residual iron mouth that absolute altitude is low.
2. blowing out according to claim 1 goes out the method for residual iron, the step that it is characterized in that the residual iron mouth of described making and casting house is: during blowing down in advance, cut open the stove skin by residual iron mouth select location, set the pre-iron notch of pre-sizing, fill out asbestos twine between stove skin and cooling stave simultaneously; Get well and dry the ditch of the residual iron of stream with the ditch backing strap of refractory mortar and pad ditch; Build complete casting house, on railway, prepare the iron flask of the residual iron of splendid attire simultaneously, install the connection groove between iron flask, the guiding molten iron flows into iron flask; When stockline is down to predetermined height, remove the bottom brick of predetermined depth, carry out iron mouth mud cover, the degree of depth is no less than 400mm, thereby completes out the preparation before residual iron.
3. blowing out according to claim 1 goes out the method for residual iron, it is characterized in that described medium-and-large-sized blast furnace is for the large blast furnace for smelting common ore deposit or for smelting the medium-and-large-sized blast furnace of high-titanium type vanadium-titanium magnetite.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103705462A CN102399926B (en) | 2011-11-21 | 2011-11-21 | Furnace halt residue iron outlet method for middle and large-sized blast furnaces |
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| CN103215398B (en) * | 2013-05-15 | 2015-02-18 | 莱芜钢铁集团有限公司 | Blast furnace overhauling residual iron placing device and method |
| CN107119158A (en) * | 2017-06-09 | 2017-09-01 | 河钢股份有限公司承德分公司 | A kind of residual iron placing method of schreyerite steelmaking furnace |
| CN108085440B (en) * | 2017-12-14 | 2019-07-02 | 安徽马钢设备检修有限公司 | Furnace method is taken off in a kind of blast furnace overhaul |
| CN109295271B (en) * | 2018-11-27 | 2020-07-14 | 南京钢铁股份有限公司 | Method for prolonging time for recovering coal gas by blowing out blast furnace empty material line |
| CN111334630A (en) * | 2020-04-10 | 2020-06-26 | 北京首钢股份有限公司 | Blast furnace thermocouple repairing method |
| CN111809012A (en) * | 2020-07-04 | 2020-10-23 | 北京首钢建设集团有限公司 | Construction method for removing accumulated iron in iron-making blast furnace by using residual iron discharging mode |
| CN113528726A (en) * | 2021-07-14 | 2021-10-22 | 攀钢集团攀枝花钢钒有限公司 | Structure and operation method for discharging more residual iron from blast furnace |
| CN114686625A (en) * | 2022-01-29 | 2022-07-01 | 北京首钢股份有限公司 | Method for discharging residual iron from blast furnace |
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