CN104302787A - Method for loading raw material into blast furnace - Google Patents
Method for loading raw material into blast furnace Download PDFInfo
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- CN104302787A CN104302787A CN201380025729.8A CN201380025729A CN104302787A CN 104302787 A CN104302787 A CN 104302787A CN 201380025729 A CN201380025729 A CN 201380025729A CN 104302787 A CN104302787 A CN 104302787A
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- coke
- blast furnace
- ore
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/20—Arrangements of devices for charging
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture Of Iron (AREA)
Abstract
The present invention can provide a method for loading material into a blast furnace in which ventilation of the interior of the blast furnace is maintained so that improved stability and thermal efficiency can be achieved during blast furnace operation even when the coke amount is low or when carrying out an operation in which a large amount of pulverized coal is blown in. This is achieved in the present invention by setting the average layer thickness (Lav1) determined by formula (1) for each rotation of a rotating chute so that said thickness is less than the thickness (h) of coke that is loaded into the axial center section of a blast furnace. Formula (1): Lav1 = Vn/[(Rn 2 - Rn-1 2)pi]. Vn isthe loaded raw material volume (m3) per rotation occurring during the n-th rotation. Rn is the fall radius (m) of the loaded raw material occurring during the n-th rotation.
Description
Technical field
The present invention relates to the method to blast furnace charging feedstock utilizing swivel chute to charging feedstock in stove.
Background technology
Blast furnace is generally the ores such as agglomerate, pellet, massive and coke are loaded from furnace roof with stratiform, flows into combustion gas and obtain the pig iron by air port.The blast furnace charging feedstock be loaded into and coke and ore decline from furnace roof to stove bottom, cause the reduction of ore and the intensification of raw material.If ore layer heats up, due to the load from top, the space landfill between ore is out of shape gradually, forms the very large and gas almost immobilising welding layer of aeration resistance in the below in the axle portion of blast furnace.
In the past, be alternately load ore and coke to blast furnace charging feedstock, in stove, make ore layer and coke layer alternately become stratiform.In addition, there is the ore being called as welding band and soften the large ore layer of the aeration resistance of welding and the smaller coke slit of the aeration resistance that formed by coke in bottom in blast furnace.
The air permeability impact of air permeability on blast furnace entirety of this welding band is very large, hinders the productivity of blast furnace.Further, when carrying out low Jiao's operation, because the amount of coke used reduces, coke slit may be infinitely thinning.
As everyone knows, in order to improve the aeration resistance of welding band, very effective at ore layer mixing coke, report large quantity research to obtain suitable admixture.
Such as, in patent documentation 1, in bell-less blast furnace, the ore funnel to the downstream side in ore funnel loads coke, makes coke lamination load furnace top bin on a conveyor above ore, ore and coke is loaded in blast furnace via swivel chute.
In addition, in patent documentation 2, in the feed bin of furnace roof, stockpile ore and coke respectively, coke is mixed with ore simultaneously and loads, thus carry out 3 kinds batches simultaneously, namely, the usual loading of coke with batch, the center of coke load with batch and mixing load with batch.
And, in patent documentation 3, in order to prevent the reduction of the gas effciency near the destabilization of the welding belt shape of blast furnace operating and central part, realize the raising of safety operation and thermo-efficiency, in the raw material charging method of blast furnace, whole ore and whole coke are mixed in rear loading stove completely.
Patent documentation 1: Japanese Unexamined Patent Publication 3-211210 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2004-107794 publication
Patent documentation 3: Japanese Patent Publication 59-10402 publication
But in order to improve the aeration resistance of welding band, known as the technology that above-mentioned patent documentation 3 is recorded, it is effectively for being pre-mixed coke at ore layer.
But, the median size of the representational coke that patent documentation 3 is recorded is about 40 ~ 50mm, the median size of ore is about 15mm, because both particle diameters are widely different, so by means of only merely mixing, voidage may be made significantly to reduce, and air permeability in stove worsens and produces bad and so on the fault of decline of the leakage of gas, raw material.
In addition, even if cut out ore and coke from two feed bins respectively and mix loading simultaneously, owing to loading the inclination in face, the coke that makes particle diameter large is rolled into far, so there is the segregative problem of coke.
In order to avoid above-mentioned fault, consider the method forming the layer of only coke in furnace axis portion.According to the method, guarantee the passage of gas in furnace axis portion by coke layer, so air permeability can be improved.In addition, known cut out ore and coke at the same time and mixing loads time, counter the fascinating stowed from center by charging feedstock loads avoiding above-mentioned fault to be effectively.
But, when the raw material loading interval of blast furnace radial direction is very little, or inferior in the situation often rotating once loaded raw material too much, and the stockpile loaded when certain rotates can be crossed by the stockpile loaded when next rotates.In this case, raw material flows into blast furnace central part, and mixing coke is separated, and causes the problem such as reduction of the deterioration of blend level controlling, coke blend level.In addition, usually cut out in mixing loading while anti-loading of fascinating, particularly when raw material loading interval is very narrow, the stockpile that charging feedstock has just scattered before crossing and flow into central side, mixing coke is separated, and causes the problem such as reduction of the deterioration of blend level controlling, coke blend level.
Summary of the invention
The present invention develops in view of above-mentioned present situation, object is to provide a kind of method to blast furnace charging feedstock, even if when raw material loading interval is narrow, also the Combination in mixolimnion can be guaranteed, realize the stabilization of blast furnace operating and the raising of thermo-efficiency, in addition, when coke ore cut out simultaneously and mix load time adopt counter fascinate load, regulate the raw material Intake Quantity or loading interval that rotate at every turn and load, prevent this charging feedstock from crossing the stockpile of previous loading and flowing into central side, the Combination in mixolimnion can be guaranteed thus, realize the stabilization of blast furnace operating and the raising of reaction efficiency.
That is, main composition of the present invention is as described below.
1. the method to blast furnace charging feedstock, by to 1 time of blast furnace charging feedstock charging, be divided into the coke of more than 2 batches to load, the ore loading of more than 2 batches, use swivel chute carries out in the multiple batches of loading loaded, when the loading of this coke and the loading of this ore are cut out simultaneously and carry out
Make the average thickness L of each rotation of the above-mentioned swivel chute obtained by following formula 1
av1, less than the thickness h of coke of the axle central part being encased in blast furnace.
L
av1＝V
n/〔(R
n 2－R
n-1 2)π〕···1
Here, V
n: the charging feedstock volume (m of this rotation rotated for n-th time
3) [Intake Quantity (t)/(apparent density (t/m of coke and ore mixolimnion of this rotation rotated for n-th time
3))],
R
n: n-th time rotate charging feedstock fall radius (m).
2. the method to blast furnace charging feedstock, by to 1 time of blast furnace charging feedstock charging, be divided into the coke of more than 2 batches to load, the ore loading of more than 2 batches, use swivel chute carries out in the multiple batches of loading loaded, when the loading of this coke and the loading of this ore are cut out simultaneously and carry out
When n is set to arbitrary natural number, make the average thickness L rotated for n-th time of the above-mentioned swivel chute obtained by following formula 2
av2(n), the average thickness L rotated for (n+1)th time obtained by following formula 3
av2(n+1) following formula 4 is met,
L
av2(n)＝V
n/〔(R
n 2－R
n-1 2)π〕···2
L
av2(n+1)＝V
n+1/〔(R
n+1 2－R
n 2)π〕···3
Here, V
n: the charging feedstock volume (m of this rotation rotated for n-th time
3),
R
n-1: (n-1)th time rotate charging feedstock fall radius (m),
R
n: n-th time rotate charging feedstock fall radius (m),
V
n+1: the charging feedstock volume (m of this rotation rotated for (n+1)th time
3),
R
n+1: (n+1)th time rotate charging feedstock fall radius (m),
L
av2(n+1)＜L
av2(n)···4。
According to the present invention, when loading ore and coke in blast furnace, charging feedstock scatters the position in regulation, mixing coke is not separated, so the air permeability of stove bottom significantly improves, the reduction rate of ore increases substantially, even if under raw material loads the narrow situation in interval, and when coke ore cut out simultaneously and mix load time application counter fascinate load, also can carry out stable blast furnace operating.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the main points represented to blast furnace charging feedstock.
Fig. 2 (a) represents that existing raw material loads the schematic diagram of state, and Fig. 2 (b) represents that raw material of the present invention loads the schematic diagram of state.
Fig. 3 (a) represents that other raw material existing loads the schematic diagram of state, and Fig. 3 (b) represents that other raw material of the present invention loads the schematic diagram of state.
Fig. 4 is that contrast represents the state to blast furnace charging feedstock of the present invention and the schematic diagram of the state of charging feedstock in common blast furnace.
Fig. 5 is that contrast represents the schematic diagram loading the state of other raw material and the raw material loading state in common blast furnace to blast furnace of the present invention.
Fig. 6 is that the raw material in the contrast state to blast furnace charging feedstock of the present invention and common blast furnace loads state, represents the explanatory view of top, the reduced state of middle part and bottom, ventilation, heat conduction state and melting carburizing state.
Fig. 7 is the brief configuration figure of the experimental installation representing the high temperature proterties measuring ore.
Embodiment
Below, by reference to the accompanying drawings, the representational embodiment of the present invention is described.
Composition graphs 1 illustrates the concrete loading main points loading ore and coke in blast furnace.
In the following description, in furnace top bin 12a, only stockpile coke, and stockpile ore in furnace top bin 12b and 12c.
In addition, in figure, 10 is blast furnaces, and 12a ~ 12c is furnace top bin, and 13 is flow adjustment doors, and 14 is set funnels, and 15 is without bell type charging apparatus, and 16 is swivel chutes.In addition, θ is the angle of swivel chute relative to vertical direction.
As the order from furnace top bin charging feedstock, first, when the central part of blast furnace forms central coke layer, the raw material of swivel chute 16 is loaded the furnace wall inner peripheral portion that point of destination is set to blast furnace, only load coke from the furnace top bin 12a that coke is only housed, thus form central coke layer at the central part of blast furnace.In addition, also periphery coke layer can be formed in furnace wall inner peripheral portion.
Namely, point of destination is loaded towards under the state in the furnace wall portion of blast furnace at the raw material of swivel chute 16, the flow of furnace top bin 12b and 12c adjustment door 13 is closed, the flow of furnace top bin 12a adjustment door 13 is opened, only the coke being accumulated in this furnace top bin 12a is supplied to swivel chute 16, thus forms central coke layer at the central part of blast furnace.
Then, coke loading and ore loading is carried out from furnace top bin 12a, 12b or 12c in the mode cut out simultaneously, but now loading order near blast furnace central shaft, namely move successively upward from the position that θ is little, then be separated laterally to the central shaft from blast furnace, direction that namely θ is large moves, finally the upper end side of sloped sidewall is loaded.
Here, in the present invention importantly, the average thickness L above-mentioned swivel chute obtained by following formula 1 being rotated at every turn
av1be less than the thickness h of the central coke of the axle central part being loaded into blast furnace.
L
av1＝V
n/〔(R
n 2－R
n-1 2)π〕···1
Here, V
n: Intake Quantity (t)/(apparent density (t/m of coke and ore mixolimnion of this rotation rotated for n-th time
3))
R
n: n-th time rotate charging feedstock fall radius (m)
〔L
av1＜h〕
Handling equipment till furnace top bin etc. produce ore, coke segregation, only load ore or coke, mix with the coke loaded from other furnace top bin 12a, 12b and 12c, ore at set funnel 14, but the ratio of ore or coke increases, and the blend level of the ore formed by swivel chute 16 and the mixolimnion of coke is uneven.
Therefore, in the present invention, as shown in Figure 2, the L that through type 1 is obtained is made
av1be less than the thickness h of the central coke of the axle central part being loaded into blast furnace, thus eliminate the ununiformity of above-mentioned mixolimnion, though result be few in amount of coke or implement fine coal be blown into operation in a large number, also stably can guarantee the air permeability in blast furnace.
Further, above-mentioned L
av1preferably in the scope of about 0.7 ~ 0.95 times of h.
This be in order to prevent charging feedstock cross before the stockpile that just scattered and flow into central side, mixing coke is separated and makes the deterioration of blend level controlling, the reduction of coke blend level.
In addition, in the present invention, although meet above-mentioned L
av1the relation of < h is very important, but is preferably respectively, L as concrete value
av1be 0.90 ~ 1.35 (m) left and right, h is the scope of 1.20 ~ 1.50 (m) left and right.
That is, in the present invention, the formation of mixolimnion 12e as shown in Figure 2 above, makes the average thickness L of each rotation of the swivel chute obtained by above-mentioned formula 1
av1be formed as less than the thickness h of central coke.
In addition, in the present invention importantly, when n is random natural number, the average thickness L rotated for n-th time of the above-mentioned swivel chute obtained by following formula 2
av2(n) and the average thickness L rotated for (n+1)th time obtained by following formula 3
av2(n+1) following formula 4 is met.Wherein, R during n=1
n-1be 0.In addition, if the height of central coke is h when forming central coke, then L can be set to
av2(1)=h.Certainly, can independently form the 1st time with the height of central coke and rotate, R during n=1
n-1be 0, obtain L
av2(1).
L
av2(n)＝V
n/〔(R
n 2－R
n-1 2)π〕···2
L
av2(n+1)＝V
n+1/〔(R
n+1 2－R
n 2)π〕···3
Here, V
n: the charging feedstock volume (m of this rotation rotated for n-th time
3)
R
n-1: (n-1)th time rotate charging feedstock fall radius (m)
R
n: n-th time rotate charging feedstock fall radius (m)
V
n+1: the charging feedstock volume (m of this rotation rotated for (n+1)th time
3)
R
n+1: (n+1)th time rotate charging feedstock fall radius (m)
L
av2(n+1)＜L
av2(n)···4
〔L
av2(n+1)＜L
av2(n)〕
The coke simultaneously cut out from furnace top bin 12a, 12b or 12c and ore interflow in set funnel 14, loads by loading chute.Now, when high with the stockpile of ring-type loading during the aspect ratio of the stockpile loaded with ring-type in loading chute and rotating for (n+1)th time rotates for n-th time, charging feedstock may rotate heap more than n-th time and flow to central side.In this case, in the process that the raw material to rotate for (n+1)th time flow on inclined-plane, coke is separated, so the reduction of coke blend level, cannot give full play to air permeability and improve effect.
Therefore, in the present invention, as shown in Figure 3, the average thickness L rotated for n-th time obtained by above-mentioned formula 2 is made
av2n average thickness L that () is rotated than (n+1)th time that is obtained by above-mentioned formula 3
av2(n+1) large, thus eliminate the ununiformity of above-mentioned mixolimnion, even if as a result, in amount of coke seldom, implement fine coal be blown into operation in a large number, also stably can guarantee the air permeability in blast furnace.
Further, above-mentioned L
av2(n) and L
av2(n+1) ratio (L
av2(n+1)/L
av2(n)) preferably in the scope of about 0.5 ~ 0.9.This is because when above-mentioned ratio is more than 0.9, rotating that the stockpile that loads for n-th time crossed by the raw material loaded for (n+1)th time, to flow into the possibility of central side high, when above-mentioned ratio is below 0.5, owing to loading the expansion at interval or the minimizing of charging feedstock, and be difficult to control raw material accumulation shape.
In addition, in the present invention, although the relation meeting above-mentioned formula 4 is very important, as concrete value, V
nbe preferably 2 ~ 7 (m
3) left and right, R
1be preferably 1 ~ 2 (m) left and right, Δ R is preferably the scope of 0.2 ~ 0.5 (m) left and right.
And the layer be made up of above-mentioned central coke layer and mixolimnion 12e is formed into top from bottom successively in blast furnace 10.
According to aforesaid method, make by coke layer and the mixolimnion 12 that cuts out simultaneously
ethe layer lamination successively formed, thus axle center part in blast furnace 10 and furnace wall portion, the little coke layer of aeration resistance is formed from bottom house to upper blast furnace, even if under raw material loads the narrow situation in interval, the mixolimnion 12e mixed completely by coke and ore can not only be formed betwixt, can also prevent mixing caused voidage by coke and reduce the upper blast furnace air permeability deterioration caused.And, the mixolimnion 12e mixed completely by coke and ore can be formed between coke layer, so the air permeability that can obtain State of Blast Furnace bottom to greatest extent improves effect.
Therefore, as shown in the right half part of Fig. 4 or 5, the blast tube 21 in the air port that the high-temperature gas based on CO is arranged from the molten soup delay portion of the bottom at blast furnace 10 flows into, and forms the gas stream risen by coke layer thus, and forms the gas stream risen by mixolimnion.Utilize the high-temperature gas flowed into from this blast tube 21 that coke is burnt, ore reduction is melted.
The flowing of the gas in blast furnace is now as shown in Fig. 4 or 5.Send into the air of high temperature from the blast tube 21 of the bottom being arranged at blast furnace 10 by air port, make the coke near air port, pulverized coal friring, produce the CO of high temperature thus
2gas.CO
2the coke gasification reaction of gas and bottom house and become CO, melts ore reduction.
Thus, the ore melting of the bottom of blast furnace 10, the coke in loading blast furnace 10 and ore decline from furnace roof to stove bottom, cause the reduction of ore and the intensification of ore.
Therefore, at the welding band that the upper side formation ore of melting layer softens, the reduction of ore is carried out in the upper side of this welding band.
Now, as shown in the right half part of Fig. 6, in the bottom of blast furnace 10, in mixolimnion 12e, ore and coke are mixed to coke completely and enter state between ore, and air permeability is enhanced, and high-temperature gas is directly by between ore, so there is no thermal conductivity delay, thermal conduction characteristic can be improved.
And in the bottom of the welding band of blast furnace 10, the contact area of ore and high-temperature gas expands, and can promote carburizing.In addition, in welding band, air permeability and thermal conductivity can be improved.And, on the top of blast furnace 10, also because ore and coke are close to configuration, postpone so do not produce reduction due to the reduction reaction of ore and the mutual activation phenomenon of gasification reaction (carbon's solution loss reaction) and linked reaction, well reduce.
Reduction reaction is now by FeO+CO=Fe+CO
2represent.
In addition, gasification reaction is by C+CO
2=2CO represents.
On the other hand, being in the conventional example of stratiform by above-mentioned ore and coke lamination, as shown in the left-half of Fig. 4 or 5, in blast furnace, alternately loading ore and coke, thus in blast furnace, make ore layer and coke layer load in the mode of stratiform.There are the following problems in now existence, namely, when flowing into the high-temperature gas based on CO from the blast tube 21 in air port, as shown in the left-half of Fig. 6, in the bottom of welding band, because coke slit reduces, ventilation is limited, and the pressure-losses rises, and the contact area of ore and high-temperature gas diminishes and carburizing is limited thus.
In addition, form coke slit in the upper side of welding band, mainly through this coke slit to ore heat conduction, so produce thermal conductivity delay and make heat conduction not enough.Further, on the top of blast furnace 10, the ore layer lamination of the coke layer that air permeability is good and air permeability difference, so not only heat-up rate reduces, and only carries out reduction reaction, does not realize above-mentioned linked reaction, so there is the problem producing reduction and postpone.
But, in the present invention, as mentioned above, the loading layer that the mixolimnion 12e that lamination is mixed completely by coke layer and coke and ore is formed, so do not form coke slit at mixolimnion, uniform stream, and guarantee good thermal conductivity, stable ventilation can be improved, above-mentioned existing problem points can be solved well.
In addition, manufactured the amount of coke (kg) required for 1t iron liquid, namely coke ratio is about 320 ~ 350kg/t, but when carrying out raw material loading according to the present invention, coke ratio can reduce to about 270 ~ 320kg/t in the past.
Embodiment
(embodiment 1)
In order to confirm effect of the present invention, use the experimental installation shown in Fig. 7, the raw material reduction in analog blast furnace, temperature-rise period investigate the change of its aeration resistance.
This experimental installation, at the inner peripheral surface configuration furnace core tube 32 of the body of heater 31 of cylindrical shape, configures cylindric heater 33 in the outside of this furnace core tube 32.In the inner side of furnace core tube 32, at the crucible 35 of the upper end of the cylinder 34 be made up of refractory body configuration graphite-made, at this crucible 35 built with charging feedstock 36.The load deceleration loading device 38 linked via jumper bar 37 is utilized to apply load to become the state roughly the same with the welding layer of bottom house from top to this charging feedstock 36.The bottom of cylinder 34 is provided with dropping sampling unit 39.
Cylinder 34 via crucible 35 bottom carries the gas adjusted by gas mixer 40 to crucible 35.Then, the gas of gas analysis apparatus 41 to the charging feedstock 36 that have passed in crucible 35 is utilized to analyze.Be equipped with the thermopair 42 of heating and temperature control at heater 33, utilize this thermopair 42 to measure temperature and utilize control device (not shown) to control heater 33, thus crucible 35 is heated to 1200 ~ 1500 DEG C.
Here, use material shown below as the charging feedstock 36 be loaded in crucible 35.
When making coke not mix with ore layer completely (comparative example 1) and according to the various loaded conditions shown in table 1, average thickness L
av1and the thickness h of central coke, carry out fine coal than the high fine coal for 180kg/t than operation.In addition, blast furnace every day go out iron (t/d) divided by furnace volume (m
3) value of gained and porductivity coefficient as shown in table 1.
In addition, the Intake Quantity V of each charging feedstock rotated
n, the initial of charging feedstock fall radius R
1and the radius increasing amount Δ R falling each rotation of radius of charging feedstock records in Table 1.In addition, R
n-R
n-1=Δ R (n is random natural number).
Further, in Table 1 by the operating result of each situation relatively also record.
[table 1]
[table 1]
In this table 1, coke ratio and fine coal are than being the amount of coke and coal amount (kg) that use when manufacturing 1t iron liquid.
Reduction material is than the summation being coke ratio and fine coal ratio.
Gas effciency is the CO of furnace roof
2ratio with the concentration of CO, is calculated by following formula.
Gas effciency=CO
2/ (CO
2+ CO) × 100
Here, CO
2furnace roof CO
2concentration [%], CO is furnace roof CO concentration [%], and in addition, Δ P/V is by the index of the aeration resistance exponentiate in blast furnace, is calculated by following formula.
ΔP/V＝(BP－TP)/BGV
Here, BP is pressure of air supply [Pa], TP be furnace top pressure [Pa], BGV is Bosch gas volume (Bosch gas volume) [m
3(standard state)/min]
As shown in Table 1, the coke ratio of comparative example 1 is 342kg/t, but makes L
av1for the scope of about 0.7 ~ 0.95 times of h, L
av1it is 0.90 ~ 1.35 (m) left and right, h is that the scope etc. of 1.20 ~ 1.50 (m) left and right is when carrying out raw material loading according to the present invention, the coke ratio of example 1 312kg/t can be reduced to, and the coke ratio of example 2 about 300kg/t can be reduced to.
Even if confirm formed low coke ratio low reduction material than time also can reduce aeration resistance.
In addition, in the above-described embodiment, each Intake Quantity V rotated
nand the radius increasing amount Δ R falling each rotation of radius of charging feedstock is fixing in each example, as long as but meet L
av1the relation of < h, even if then change each V rotated
n, Δ R, also can obtain effect of the present invention without any problems.
In addition, in the above-described embodiment, to by swivel chute fascinate and situation that the open and close controlling of flow adjustment door of stove item feed bin forms central coke layer and mixolimnion is illustrated, but be not limited thereto, the special chute of coke that also axle center part to blast furnace directly can be dropped into coke is configured in the position of not interfering with swivel chute, utilizes the special chute of this coke directly load coke to the axle center part of blast furnace and form central coke layer.For this reason, confirm and make L
av1for the scope of about 0.7 ~ 0.95 times of h, L
av1be 0.90 ~ 1.35 (m) left and right, h is the scope of 1.20 ~ 1.50 (m) left and right, though thus the low reduction material defining low coke ratio than time also can reduce aeration resistance.
(embodiment 2)
Further, be 4000mm at internal capacity
3in the actual blast furnace of level, implement raw material and load test and compare operation condition.In this blast furnace, as shown in Figure 1, at upper blast furnace, there are 3 independently feed bins, be respectively charged into coke or ore.During usual loading, for each charging, after loading 2 batches of coke, load 2 batches of ores, and load in (120kg/t) in mixing, after loading 1 batch of coke, the first half Duan Xianglu central part cut out at the coke of the 2nd batch loads coke, forms central coke layer.Then, cut out ore from the feed bin of the opposing party simultaneously, by anti-loading of fascinating, raw material loaded and form coke mixolimnion.
As shown in table 2 according to the test-results of said sequence.
[table 2]
In above-mentioned table 2, coke ratio and fine coal are than the amount of coke used when being and manufacturing 1t iron liquid and coal amount (kg).
Reduction material is than the summation being coke ratio and fine coal ratio.
Gas effciency is the CO of furnace roof
2ratio with the concentration of CO, is calculated by following formula.
Gas effciency=CO
2/ (CO
2+ CO) × 100
Here, CO
2furnace roof CO
2concentration [%], CO is furnace roof CO concentration [%], and in addition, Δ P/V is the index aeration resistance exponentiate in blast furnace obtained, and is calculated by following formula.
ΔP/V＝(BP－TP)/BGV
Here, BP is pressure of air supply [Pa], TP be furnace top pressure [Pa], BGV is Bosch gas volume [m
3(standard state)/min]
As shown in Table 2, example 1 and 2 shows the lower Δ P/V of the comparative example 1 and 2 higher than coke ratio.In addition, even if be in the lower example 3 of 310kg/t at coke ratio, also obtaining is the Δ P/V that the comparative example 2 of 350kg/t is identical with coke ratio.
According to above result, though confirm formed low coke ratio low reduction material than time also can reduce aeration resistance.
In addition, in the above-described embodiment, each Intake Quantity V rotated
nand the radius increasing amount Δ R falling each rotation of radius of charging feedstock is fixing in each example, as long as but meet L
av2(n+1) < L
av2n the relation of (), even if then suitably change each V rotated
n, Δ R, also can obtain effect of the present invention without any problems.
The explanation of Reference numeral
10 ... blast furnace; 12a ~ 12c ... furnace top bin; 13 ... flow adjustment door; 14 ... set funnel; 15 ... without bell type charging apparatus; 16 ... swivel chute; 31 ... body of heater; 32 ... furnace core tube; 33 ... heater; 34 ... cylinder; 35 ... graphite-made crucible; 36 ... charging feedstock; 37 ... jumper bar; 38 ... load deceleration loading device; 39 ... dropping sampling unit; 40 ... gas mixer; 41 ... gas analysis apparatus; 42 ... thermopair.
Claims (2)
1., to a method for blast furnace charging feedstock, it is characterized in that,
By to 1 time of blast furnace charging feedstock charging, be divided into the coke of more than 2 batches to load, the ore of more than 2 batches loads, use swivel chute carries out in the multiple batches of loading loaded, when the loading of this coke and the loading of this ore are cut out simultaneously and carry out,
Make the average thickness L of each rotation of the above-mentioned swivel chute obtained by following formula 1
av1, it is less than the thickness h of coke of the axle central part being encased in blast furnace,
L
av1＝V
n/〔(R
n 2－R
n-1 2)π〕 ···1
Here, V
n: Intake Quantity (t)/(apparent density (t/m of coke and ore mixolimnion of this rotation rotated for n-th time
3)),
R
n: n-th time rotate charging feedstock fall radius (m).
2., to a method for blast furnace charging feedstock, it is characterized in that,
By to 1 time of blast furnace charging feedstock charging, be divided into the coke of more than 2 batches to load, the ore of more than 2 batches loads, use swivel chute carries out in the multiple batches of loading loaded, when the loading of this coke and the loading of this ore are cut out simultaneously and carry out,
When n is set to arbitrary natural number, make the average thickness L rotated for n-th time of the above-mentioned swivel chute obtained by following formula 2
av2(n), the average thickness L rotated for (n+1)th time obtained by following formula 3
av2(n+1) following formula 4 is met,
L
av2(n)＝V
n/〔(R
n 2－R
n-1 2)π〕 ···2
L
av2(n+1)＝V
n+1/〔(R
n+1 2－R
n 2)π〕 ···3
Here, V
n: the charging feedstock volume (m of this rotation rotated for n-th time
3),
R
n-1: (n-1)th time rotate charging feedstock fall radius (m),
R
n: n-th time rotate charging feedstock fall radius (m),
V
n+1: the charging feedstock volume (m of this rotation rotated for (n+1)th time
3),
R
n+1: (n+1)th time rotate charging feedstock fall radius (m),
L
av2(n+1)＜L
av2(n) ···4。
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-114862 | 2012-05-18 | ||
| JP2012114860 | 2012-05-18 | ||
| JP2012-114860 | 2012-05-18 | ||
| JP2012114862 | 2012-05-18 | ||
| PCT/JP2013/003165 WO2013172042A1 (en) | 2012-05-18 | 2013-05-17 | Method for loading raw material into blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104302787A true CN104302787A (en) | 2015-01-21 |
| CN104302787B CN104302787B (en) | 2016-10-05 |
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ID=49583468
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380025729.8A Active CN104302787B (en) | 2012-05-18 | 2013-05-17 | Method to blast furnace charging feedstock |
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| Country | Link |
|---|---|
| EP (1) | EP2851437B1 (en) |
| JP (1) | JP5574064B2 (en) |
| KR (1) | KR101592955B1 (en) |
| CN (1) | CN104302787B (en) |
| TR (1) | TR201816178T4 (en) |
| WO (1) | WO2013172042A1 (en) |
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|---|---|---|---|---|
| CN113614253A (en) * | 2019-04-03 | 2021-11-05 | 杰富意钢铁株式会社 | Blast furnace abnormality determination device, blast furnace abnormality determination method, and blast furnace operation method |
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| JP6269549B2 (en) * | 2015-03-26 | 2018-01-31 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| JP6260751B2 (en) * | 2015-10-28 | 2018-01-17 | Ｊｆｅスチール株式会社 | Raw material charging method to blast furnace |
| JP7331876B2 (en) * | 2020-04-22 | 2023-08-23 | Ｊｆｅスチール株式会社 | Injection method of center coke |
| CN112410484B (en) * | 2020-11-18 | 2022-03-25 | 山东钢铁集团日照有限公司 | Blast furnace distributing method for interval ore pressing |
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| JPS5579810A (en) * | 1978-12-08 | 1980-06-16 | Kawasaki Steel Corp | Operating method for blast furnace by mixed charge |
| JPS61243107A (en) * | 1985-04-19 | 1986-10-29 | Nippon Kokan Kk <Nkk> | Method for charging raw material to blast furnace |
| JPH03211210A (en) * | 1990-01-16 | 1991-09-17 | Kawasaki Steel Corp | Method for charging raw material in bell-less blast furnace |
| JPH06271908A (en) * | 1993-03-19 | 1994-09-27 | Kawasaki Steel Corp | Method for charging raw material in multi-batches into bell-less blast furnace |
| JP2002256311A (en) * | 2001-02-28 | 2002-09-11 | Nkk Corp | Method for charging raw material for blast furnace into furnace |
| JP2005060797A (en) * | 2003-08-18 | 2005-03-10 | Jfe Steel Kk | Method for charging material to blast furnace |
| CN1596315A (en) * | 2002-08-29 | 2005-03-16 | 杰富意钢铁株式会社 | Raw material charging method for bell-less blast furnace |
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| JPS5910402A (en) | 1982-07-10 | 1984-01-19 | Toshiba Corp | Rolling mill and rolling method |
| JP4269847B2 (en) | 2002-08-30 | 2009-05-27 | Ｊｆｅスチール株式会社 | Raw material charging method for bell-less blast furnace |
-
2013
- 2013-05-17 TR TR2018/16178T patent/TR201816178T4/en unknown
- 2013-05-17 CN CN201380025729.8A patent/CN104302787B/en active Active
- 2013-05-17 JP JP2013556706A patent/JP5574064B2/en active Active
- 2013-05-17 KR KR1020147033494A patent/KR101592955B1/en active IP Right Grant
- 2013-05-17 WO PCT/JP2013/003165 patent/WO2013172042A1/en active Application Filing
- 2013-05-17 EP EP13791416.4A patent/EP2851437B1/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5579810A (en) * | 1978-12-08 | 1980-06-16 | Kawasaki Steel Corp | Operating method for blast furnace by mixed charge |
| JPS61243107A (en) * | 1985-04-19 | 1986-10-29 | Nippon Kokan Kk <Nkk> | Method for charging raw material to blast furnace |
| JPH03211210A (en) * | 1990-01-16 | 1991-09-17 | Kawasaki Steel Corp | Method for charging raw material in bell-less blast furnace |
| JPH06271908A (en) * | 1993-03-19 | 1994-09-27 | Kawasaki Steel Corp | Method for charging raw material in multi-batches into bell-less blast furnace |
| JP2002256311A (en) * | 2001-02-28 | 2002-09-11 | Nkk Corp | Method for charging raw material for blast furnace into furnace |
| CN1596315A (en) * | 2002-08-29 | 2005-03-16 | 杰富意钢铁株式会社 | Raw material charging method for bell-less blast furnace |
| JP2005060797A (en) * | 2003-08-18 | 2005-03-10 | Jfe Steel Kk | Method for charging material to blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113614253A (en) * | 2019-04-03 | 2021-11-05 | 杰富意钢铁株式会社 | Blast furnace abnormality determination device, blast furnace abnormality determination method, and blast furnace operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2851437A1 (en) | 2015-03-25 |
| KR101592955B1 (en) | 2016-02-11 |
| KR20150004907A (en) | 2015-01-13 |
| TR201816178T4 (en) | 2018-11-21 |
| WO2013172042A1 (en) | 2013-11-21 |
| EP2851437A4 (en) | 2015-12-16 |
| JPWO2013172042A1 (en) | 2016-01-12 |
| EP2851437B1 (en) | 2018-10-03 |
| CN104302787B (en) | 2016-10-05 |
| JP5574064B2 (en) | 2014-08-20 |
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