CN104302787B - Method to blast furnace charging feedstock - Google Patents
Method to blast furnace charging feedstock Download PDFInfo
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- CN104302787B CN104302787B CN201380025729.8A CN201380025729A CN104302787B CN 104302787 B CN104302787 B CN 104302787B CN 201380025729 A CN201380025729 A CN 201380025729A CN 104302787 B CN104302787 B CN 104302787B
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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
- 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 provides a kind of method to blast furnace charging feedstock, according to the present invention, makes the average thickness (L every time rotated of the above-mentioned swivel chute obtained by formula 1av1) less than the thickness (h) of the coke of the axle central part being encased in blast furnace, even if thus few in amount of coke or implement fine coal be blown into operation in a large number in the case of, can also ensure that the aeration in blast furnace, it is achieved the stabilisation of blast furnace operating and the raising of the thermal efficiency.Additionally, formula 1 is Lav1=Vn/〔(Rn 2-Rn‑1 2) π), VnIt is the charging feedstock volume (m of this rotation that n-th rotates3), RnBe n-th rotate charging feedstock fall radius (m).
Description
Technical field
The present invention relates to the use of swivel chute side to blast furnace charging feedstock of charging feedstock in stove
Method.
Background technology
Blast furnace be usually by the ores such as sintering deposit, pellet, massive and coke from furnace roof with
Stratiform loads, and flows into combustion gas by air port and obtains the pig iron.The blast furnace charging feedstock being loaded into i.e. Jiao
Charcoal and ore decline to stove bottom from furnace roof, cause the reduction of Ore and the intensification of raw material.Ore deposit
If stone raw material layer heats up, due to the load that comes from above, the space between ore is filled
And gradually deform, the aeration resistance formed below in the axle portion of blast furnace is very big and gas hardly
The welding layer of flowing.
In the past, it was alternately to load ore and coke to blast furnace charging feedstock, in stove, made Ore
Raw material layer and coke layer alternately become stratiform.It addition, bottom existence is referred to as welding band in blast furnace
Ore soften welding the big ore layer of aeration resistance and by coke formed logical
The coke slit that atmidometer is smaller.
The aeration of this welding band is very big on the aeration impact that blast furnace is overall, hinders the production of blast furnace
Rate.Further, in the case of carrying out low burnt operation, owing to the amount of coke used reduces, coke is narrow
Seam may be the most thinning.
It is known that for the aeration resistance improving welding band, at ore layer mixing coke very
Effectively, numerous studies are reported in order to obtain suitable admixture.
Such as, in patent documentation 1, in bell-less blast furnace, the downstream in Ore funnel
Ore funnel loads coke, makes coke lamination load furnace roof material in the above of Ore on a conveyor
Storehouse, loads Ore and coke in blast furnace via swivel chute.
It addition, in patent documentation 2, the feed bin of furnace roof stockpiles Ore and coke respectively, will
Coke mixes with Ore simultaneously and loads, thus carries out 3 kinds of batches simultaneously, i.e., coke usual
Loading batch, the center loading batch of coke and mixing loading batch.
Further, in patent documentation 3, in order to prevent the instability of the welding belt shape of blast furnace operating
Change and the reduction of gas effciency near central part, it is achieved carrying of safety operation and the thermal efficiency
Height, in the raw material charging method of blast furnace, loads after whole Ores and whole coke being thoroughly mixed
In stove.
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, it is known that as above-mentioned patent documentation 3 is recorded
Technology is such, and it is effectively for being pre-mixed coke at ore layer.
But, the mean diameter of the representational coke that patent documentation 3 is recorded is about 40～50mm,
The mean diameter of Ore is about 15mm, owing to both particle diameters are widely different, so only by single
Mixing purely, voidage may be made to be greatly lowered, the aeration in stove deteriorates and produces gas
Leakage, raw material decline bad etc fault.
Even if it addition, cut out Ore and coke from two feed bins and mix loading respectively simultaneously, due to
The inclination in loading face and the coke that makes particle diameter big is rolled into far, so existing, coke is segregative asks
Topic.
In order to avoid above-mentioned fault, it is considered in the method that furnace axis portion forms the only layer of coke.According to
The method, guarantees the passage of gas in furnace axis portion by coke layer, it is possible to improve aeration.
During additionally, it is known that cut out Ore and coke at the same time and mix loading, it is loaded into raw material from center stack
The anti-loading of fascinating of dress is effectively to avoiding above-mentioned fault.
But, in the case of blast furnace raw material loading radially is closely spaced, or often rotating once
In the case of the raw material loaded is too much etc., the stockpile loaded when certain rotates can be revolved at next
The stockpile loaded when turning is crossed.In this case, raw material flows into blast furnace central part, mixes coke
Separate, cause the problem such as reduction of the deterioration of composite rate controlling, coke composite rate.It addition, it is logical
Often cut out in mixing loading while anti-loading of fascinating, particularly load interval very at raw material
In the case of narrow, stockpile that charging feedstock has just scattered before crossing and flow into central side, mixing Jiao
Charcoal separates, and causes the problem such as reduction of the deterioration of composite rate controlling, coke composite rate.
Summary of the invention
The present invention develops in view of above-mentioned present situation, it is therefore an objective to provide a kind of to blast furnace charging feedstock
Method, even if raw material load interval narrow in the case of, it is also possible to guarantee the mixing in mixed layer
Property, it is achieved the stabilisation of blast furnace operating and the raising of the thermal efficiency, it addition, at coke Ore simultaneously
In the case of using anti-loading of fascinating when cutting out and mix loading, it is former that regulation rotation every time is loaded
Material charge weight or loading interval, prevent this charging feedstock from crossing the stockpile of previous loading and flowing into
Central side, it is possible to the Combination guaranteeing in mixed layer, it is achieved the stabilisation of blast furnace operating and
The raising of reaction efficiency.
That is, the present invention mainly consist of described.
1., to a method for blast furnace charging feedstock, by 1 charging of blast furnace charging feedstock, divide
It is the Ore loading of more than the coke loading of more than 2 batches, 2 batches, uses swivel chute to carry 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 every time rotated of the above-mentioned swivel chute obtained by Formula 1 below
Lav1, less than the thickness h of the coke of the axle central part being encased in blast furnace.
Lav1=Vn/〔(Rn 2-Rn-1 2)π〕···1
Here, Vn: the charging feedstock volume (m of this rotation that n-th rotates3) [n-th
The charge weight (t) of this rotation rotated/(coke and apparent density (t/m of Ore mixed layer3))],
Rn: n-th rotate charging feedstock fall radius (m).
2., to a method for blast furnace charging feedstock, by 1 charging of blast furnace charging feedstock, divide
It is the Ore loading of more than the coke loading of more than 2 batches, 2 batches, uses swivel chute to carry 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 above-mentioned swivel chute obtained by Formula 2 below
N-th rotate average thickness Lav2(n), (n+1)th time obtained by Formula 3 below
Average thickness L rotatedav2(n+1) Formula 4 below is met,
Lav2(n)=Vn/〔(Rn 2-Rn-1 2)π〕···2
Lav2(n+1)=Vn+1/〔(Rn+1 2-Rn 2)π〕···3
Here, Vn: the charging feedstock volume (m of this rotation that n-th rotates3),
Rn-1: (n-1)th time rotate charging feedstock fall radius (m),
Rn: n-th rotate charging feedstock fall radius (m),
Vn+1: the charging feedstock volume (m of this rotation that (n+1)th time rotates3),
Rn+1: (n+1)th time rotate charging feedstock fall radius (m),
Lav2(n+1) ＜ Lav2(n)···4。
According to the present invention, when loading ore and coke in blast furnace, charging feedstock scatters
In the position of regulation, mixing coke does not separates, so the aeration of stove bottom significantly improves, and Ore
Reduction rate increase substantially, even if under raw material loads the narrow situation in interval, and at coke
In the case of applying anti-loading of fascinating when Ore cuts out simultaneously and mixes loading, it is also possible to carry out stable
Blast furnace operating.
Accompanying drawing explanation
Fig. 1 is the schematic diagram representing the main points to blast furnace charging feedstock.
Fig. 2 (a) is to represent the schematic diagram that existing raw material loads state, and Fig. 2 (b) is to represent
The raw material of the present invention loads the schematic diagram of state.
Fig. 3 (a) is to represent the schematic diagram that other raw material existing loads state, and Fig. 3 (b) is
Represent 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 in common blast furnace
The schematic diagram of the state of charging feedstock.
Fig. 5 is that contrast represents that the present invention's loads the state of other raw material and at common height to blast furnace
Raw material in stove loads the schematic diagram of state.
Fig. 6 is the raw material in the contrast state to blast furnace charging feedstock of the present invention and common blast furnace
Loading state, represent top, middle part and the reducing condition of bottom, ventilation, heat conduction state and
The explanatory diagram of melted carburizing state.
Fig. 7 is the brief configuration figure of the experimental provision representing the high temperature character measuring ore.
Detailed description of the invention
Hereinafter, in conjunction with accompanying drawing, the representational embodiment of the present invention is described.
Main points are specifically loaded in conjunction with what Fig. 1 explanation loaded ore and coke in blast furnace.
In the following description, furnace top bin 12a only stockpiles coke, and in furnace top bin
12b and 12c stockpiles ore.
Additionally, in figure, 10 is blast furnace, 12a～12c is furnace top bin, 13 is that flow adjusts door,
14 is set funnel, and 15 is without bell type charging apparatus, and 16 is swivel chute.It addition, θ is
Swivel chute is relative to the angle of vertical direction.
As the order from furnace top bin charging feedstock, first, the central part at blast furnace forms center
In the case of coke layer, the raw material of swivel chute 16 is loaded destination and is set in the furnace wall of blast furnace
Perimembranous, only loads coke from only furnace top bin 12a equipped with coke, thus at the central part of blast furnace
Form central coke layer.Alternatively, it is also possible to form periphery coke layer in furnace wall inner peripheral portion.
That is, when the raw material of swivel chute 16 loads destination towards the furnace wall portion of blast furnace,
The flow of furnace top bin 12b and 12c is adjusted door 13 close, by the stream of furnace top bin 12a
Amount adjusts door 13 and opens, and only supplies the coke being accumulated in this furnace top bin 12a to swivel chute
16, thus at the central part formation central coke layer of blast furnace.
Then, in the way of cutting out, carry out coke dress from furnace top bin 12a, 12b or 12c simultaneously
Enter and load with Ore, but loading order now is from the central shaft near blast furnace, i.e. from the position that θ is little
Put and move the most successively, then to from the separation of the central axial outside of blast furnace, i.e. direction big for θ
Mobile, finally the upper end side of sloped sidewall is loaded.
Here, it is important in the invention that make the above-mentioned rotation obtained by Formula 1 below slip
Average thickness L that groove rotates every timeav1Central coke less than the axle central part being loaded into blast furnace
Thickness h.
Lav1=Vn/〔(Rn 2-Rn-1 2)π〕···1
Here, Vn: the charge weight (t) of this rotation that n-th rotates/(coke mixes with Ore
Close the apparent density (t/m of layer3))
Rn: n-th rotate charging feedstock fall radius (m)
〔Lav1＜ h)
Conveying equipments till furnace top bin etc. produce the situation of the segregation of ore, coke
Under, only load ore or coke, set funnel 14 with from other furnace top bin 12a,
Coke, ore that 12b and 12c loads mix, but ore or the ratio of coke
Increase, swivel chute 16 ore formed and the composite rate of the mixed layer of coke are uneven
Even.
Therefore, in the present invention, as in figure 2 it is shown, make the L obtained by formula 1av1Less than being loaded into
The thickness h of the central coke of the axle central part of blast furnace, thus eliminate the inhomogeneities of above-mentioned mixed layer,
Even if result be few in amount of coke or implement fine coal be blown into operation in a large number in the case of, it is also possible to
Stably guarantee the aeration in blast furnace.
Further, above-mentioned Lav1Preferably the scope of about 0.7～0.95 times of h.
This is the stockpile in order to prevent charging feedstock from just having scattered before crossing and flows into central side, mixed
Focus charcoal separates and makes the deterioration of composite rate controlling, the reduction of coke composite rate.
Additionally, in the present invention, although meet above-mentioned Lav1The relation of ＜ h is critically important, but as tool
The value of body and be respectively preferably, Lav1Being 0.90～1.35 (m) left and right, h is 1.20～1.50 (m)
The scope of left and right.
I.e., in the present invention, the formation of mixed layer 12e as shown in Figure 2 above, makes by above-mentioned
Average thickness L every time rotated of the swivel chute that formula 1 is obtainedav1Be formed as thicker than central coke
H is little for degree.
It addition, it is important in the invention that when n is random natural number, pass through below formula
Average thickness L that the n-th of the 2 above-mentioned swivel chutes obtained rotatesav2(n) and by following
Average thickness L of obtain (n+1)th time rotation of formula 3av2(n+1) Formula 4 below is met.
Wherein, R during n=1N-1It is 0.If it addition, forming central coke in the case of central coke
Height be h, then can be set to Lav2(1)=h.Of course, it is possible to the height of central coke
Independently formed the 1st time and rotate, R during n=1N-1It is 0, obtains Lav2(1)。
Lav2(n)=Vn/〔(Rn 2-Rn-1 2)π〕···2
Lav2(n+1)=Vn+1/〔(Rn+1 2-Rn 2)π〕···3
Here, Vn: the charging feedstock volume (m of this rotation that n-th rotates3)
Rn-1: (n-1)th time rotate charging feedstock fall radius (m)
Rn: n-th rotate charging feedstock fall radius (m)
Vn+1: the charging feedstock volume (m of this rotation that (n+1)th time rotates3)
Rn+1: (n+1)th time rotate charging feedstock fall radius (m)
Lav2(n+1) ＜ Lav2(n)···4
〔Lav2(n+1) ＜ Lav2(n)〕
The coke simultaneously cut out from furnace top bin 12a, 12b or 12c and ore are in set leakage
Interflow in bucket 14, loads by loading chute.Now, (n+1)th rotation of chute is being loaded
In rotate with the aspect ratio n-th of the stockpile of ring-type loading in high with the stockpile of ring-type loading
In the case of, charging feedstock can exceed that n-th rotates heap and flows to central side.In this case,
Raw material coke during inclined-plane flows (n+1)th rotation separates, so coke mixing
Rate reduces, it is impossible to gives full play to aeration and improves effect.
Therefore, in the present invention, as it is shown on figure 3, make the n-th obtained by above-mentioned formula 2 rotate
Average thickness Lav2N () is than the average thickness of (n+1)th rotation obtained by above-mentioned formula 3
Lav2(n+1) big, thus eliminate the inhomogeneities of above-mentioned mixed layer, result is, even if Jiao
Charcoal amount seldom, implement fine coal be blown into operation in a large number in the case of, it is also possible to stably guarantee blast furnace
Interior aeration.
Further, above-mentioned Lav2(n) and Lav2(n+1) ratio (Lav2(n+1)/Lav2(n))
Preferably in the range of 0.5～about 0.9.This is because when above-mentioned ratio is more than 0.9,
Rotate for (n+1)th time the raw material loaded cross stockpile that n-th loads and flow into central side can
Can property high, when above-mentioned ratio is below 0.5, owing to loading the expansion at interval or charging feedstock
Reduce, and be difficult to control to raw material and pile up shape.
Additionally, in the present invention, although the relation meeting above-mentioned formula 4 is critically important, but as concrete
Value, VnIt is preferably 2～7 (m3) left and right, R1Be preferably 1～2 (m) left and right, Δ R be preferably
0.2～0.5 (m) left and right scope.
And, the layer being made up of above-mentioned central coke layer and mixed layer 12e in blast furnace 10 successively from
Top is formed at bottom.
According to said method, make by coke layer and the mixed layer 12 that cuts out simultaneouslyeThe layer constituted depends on
Secondary lamination, thus the axle center part in blast furnace 10 and furnace wall portion, from bottom house to blast furnace
Portion forms the coke layer that aeration resistance is little, even if under raw material loads the situation that interval is narrow, and can not only
Enough form the mixed layer 12e being thoroughly mixed by coke and ore betwixt, additionally it is possible to anti-
Only mixed caused voidage by coke and reduce the upper blast furnace aeration deterioration caused.And,
The mixed layer 12e being thoroughly mixed by coke and ore can be formed between coke layer,
It is possible to the aeration obtaining State of Blast Furnace bottom to greatest extent improves effect.
Therefore, as shown in the right half part of Fig. 4 or 5, make the high-temperature gas based on CO
The ajutage 21 in the air port arranged from the molten soup delay portion of the bottom at blast furnace 10 flows into, thus shape
Become the gas stream risen by coke layer, and form the gas stream risen by mixed layer.
Utilize the high-temperature gas flowed into from this ajutage 21 to make coke burn, ore reduction is melted.
The flowing of the gas in blast furnace now is as shown in Fig. 4 or 5.From being arranged at blast furnace 10
The ajutage 21 of bottom sent into the air of high temperature by air port, make the coke near air port, powder
Coal combustion, thus produces the CO of high temperature2Gas.CO2The coke gasification reaction of gas and bottom house and
Become CO, ore reduction is melted.
Thus, the ore of the bottom of blast furnace 10 melts, and loads the coke in blast furnace 10 and ore deposit
Stone raw material declines to stove bottom from furnace roof, causes the reduction of ore and the intensification of ore.
Therefore, the upper side at melting layer forms the welding band that ore softens, and melts at this
The upper side of tape splicing carries out the reduction of ore.
Now, as shown in the right half part of Fig. 6, in the bottom of blast furnace 10, at mixed layer 12e
In, ore and coke are thoroughly mixed and become coke and enter the state between ore, logical
Gas 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, ore and the contact surface of high-temperature gas
Long-pending expansion, it is possible to promote carburizing.It addition, in welding band, it is possible to improve aeration and heat conduction
Property.Further, on the top of blast furnace 10, also due to ore and coke are close to configuration, so
Owing to the reduction reaction of ore and the mutual activation phenomenon of gasification reaction (carbon's solution loss reaction) are the most even
Connection reacts and does not produce reduction and postpone, and well reduces.
Reduction reaction now is by FeO+CO=Fe+CO2Represent.
It addition, gasification reaction is by C+CO2=2CO represents.
On the other hand, be in the conventional example of stratiform by above-mentioned Ore and coke lamination, such as Fig. 4 or
Shown in the left-half of person 5, in blast furnace, alternately load Ore and coke, thus make in blast furnace
Ore layer loads in the way of stratiform with coke layer.Now exist there are the following problems, i.e. from
When the ajutage 21 in air port flows into the high-temperature gas based on CO, such as the left-half of Fig. 6
Shown in, in the bottom of welding band, ventilate owing to coke slit reduces and limited, in the pressure loss
Rising, thus the contact area of Ore and high-temperature gas diminishes and carburizing is limited.
It addition, the upper side at welding band forms coke slit, mainly by this coke slit to ore deposit
Stone conduction heat, so producing thermal conductivity delay and making heat conduction not enough.Further, upper at blast furnace 10
Portion, the ore layer lamination of the good coke layer of aeration and aeration difference, so not only programming rate fall
Low, and only carry out reduction reaction, being not carried out above-mentioned coupling reaction, producing reduction so existing
The problem postponed.
But, in the present invention, as it has been described above, lamination is complete by coke layer and coke and ore
The loading layer that the mixed layer 12e entirely mixed is formed, so being formed without coke slit at mixed layer,
Air-flow is uniform, and guarantees good heat conductivity, it is possible to improve stable ventilation, it is possible to well
Solve above-mentioned existing problem points.
Additionally, manufactured the amount of coke (kg) required for 1t ferrum liquid in the past, i.e. coke ratio is
320～about 350kg/t, but in the case of carrying out raw material loading according to the present invention, coke ratio energy
Enough it is reduced to 270～about 320kg/t.
Embodiment
(embodiment 1)
In order to confirm the effect of the present invention, use the experimental provision shown in Fig. 7, in analog blast furnace
Raw material reduction, temperature-rise period also investigate the change of its aeration resistance.
This experimental provision is at the inner peripheral surface configuration furnace core tube 32 of cylindric body of heater 31, at this combustion chamber
The heater 33 of the outside configuration cylindrical shape of pipe 32.In the inner side of furnace core tube 32, by
The crucible 35 of the upper end configuration graphite of the cylinder 34 that refractory body is constituted, built-in at this crucible 35
There is charging feedstock 36.Utilize the load charger 38 via jumper bar 37 link from top to this dress
Enter raw material 36 and apply load to become the state roughly the same with the welding layer of bottom house.Justifying
The bottom of cylinder 34 is provided with droppings sampler 39.
Carry to crucible 35 via the cylinder 34 of crucible 35 bottom and adjusted by gas mixer 40
Whole gas.Then, the gas analyzing apparatus 41 charging feedstock to having passed through in crucible 35 is utilized
The gas of 36 is analyzed.The thermoelectricity of heating and temperature control it is equipped with at heater 33
Even 42, utilize this thermocouple 42 measure temperature and utilize control device (not shown) to control to add
Heat heater 33, thus crucible 35 is heated to 1200～1500 DEG C.
Here, use material shown below as the charging feedstock 36 being loaded in crucible 35.
In the case of making coke not mix with ore layer (comparative example 1) and according to table 1
Shown various loaded conditions, average thickness Lav1And the thickness h of central coke, carry out fine coal
Than the high fine coal for 180kg/t than operation.Additionally, blast furnace every day go out iron (t/d) divided by stove
Internal volume (m3) the value i.e. porductivity coefficient of gained is as shown in table 1.
It addition, the charge weight V of the charging feedstock every time rotatedn, the initial of charging feedstock fall half
Footpath R1And the radius increments Δ R rotated falling radius of charging feedstock is in Table 1 every time
Record.Additionally, Rn-Rn-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 than be the amount of coke that uses when manufacturing 1t ferrum liquid with
And coal amount (kg).
Reduction material ratio is coke ratio and the summation of fine coal ratio.
Gas effciency is the CO of furnace roof2With the ratio of the concentration of CO, following formula calculate.
Gas effciency=CO2/(CO2+CO)×100
Here, CO2It is furnace roof CO2Concentration [%], CO is furnace roof CO concentration [%], it addition,
Δ P/V is by the index of the aeration resistance indexation in blast furnace, is calculated by following formula.
Δ P/V=(BP-TP)/BGV
Here, BP be blast pressure [Pa], TP be furnace top pressure [Pa], BGV be Bosch gas
Amount (Bosch gas volume) [m3(standard state)/min]
As shown in Table 1, the coke ratio of comparative example 1 is 342kg/t, but makes Lav1For h's
The scope of about 0.7～0.95 times, Lav1Being 0.90～1.35 (m) left and right, h is 1.20～1.50 (m)
In the case of the scope etc. of left and right carries out raw material loading according to the present invention, it is possible to by Jiao of example 1
Charcoal ratio is reduced to 312kg/t, and the coke ratio of example 2 can be reduced to about 300kg/t.
Even if confirming that the low reduction material forming low coke ratio also was able to reduce aeration resistance than time.
Additionally, in the above-described embodiment, the charge weight V every time rotatednAnd charging feedstock
The radius increments Δ R every time rotated falling radius is fixing, but
As long as meeting Lav1The relation of ＜ h, even if then change the V rotated every timen, Δ R, it is also possible in the least
Obtain the effect of the present invention without problems.
It addition, in the above-described embodiment, to being fascinated by swivel chute and stove item feed bin
The open and close controlling of flow adjustment door forms the situation of central authorities' coke layer and mixed layer and is said
Bright, but be not limited to this, it is also possible to by special for coke from coke to the axle center part of blast furnace that direct plunge into
It is arranged in the position do not interfered with swivel chute with chute, utilizes the special chute of this coke to blast furnace
Axle center part is directly loadable into coke and forms central coke layer.To this end, confirm and make Lav1For h's
The scope of about 0.7～0.95 times, Lav1Being 0.90～1.35 (m) left and right, h is 1.20～1.50 (m)
The scope of left and right, leads to even if also thus being able to reduction at the low reduction material defining low coke ratio than time
Atmidometer.
(embodiment 2)
Further, it is 4000mm at internal capacity3In the actual blast furnace of level, implement raw material and load examination
Test and compare operating condition.In this blast furnace, as it is shown in figure 1, there are 3 solely at upper blast furnace
Vertical feed bin, is respectively charged into coke or ore.When being generally encased in, for charging every time,
After loading 2 batch coke, load 2 batch ores, and in mixing loads (120kg/t),
After loading 1 batch coke, the first half Duan Xianglu central part that the coke in the 2nd batch cuts out loads Jiao
Charcoal, forms central coke layer.Then, cut out ore from the feed bin of the opposing party simultaneously, pass through
Raw material is loaded and forms coke mixed layer by anti-loading of fascinating.
Result of the test in the order described above is as shown in table 2.
[table 2]
In above-mentioned table 2, coke ratio and fine coal than the amount of coke used when being to manufacture 1t ferrum liquid with
And coal amount (kg).
Reduction material ratio is coke ratio and the summation of fine coal ratio.
Gas effciency is the CO of furnace roof2With the ratio of the concentration of CO, calculated by following formula.
Gas effciency=CO2/(CO2+CO)×100
Here, CO2It is furnace roof CO2Concentration [%], CO is furnace roof CO concentration [%], it addition,
Δ P/V is by index obtained by the aeration resistance indexation in blast furnace, is calculated by following formula.
Δ P/V=(BP-TP)/BGV
Here, BP be blast pressure [Pa], TP be furnace top pressure [Pa], BGV be Bosch gas
Amount [m3(standard state)/min]
As shown in Table 2, example 1 and 2 shows the comparative example 1 and 2 higher than coke ratio
Lower Δ P/V.Even if it addition, in the lower example 3 that coke ratio is 310kg/t, also
Obtain the Δ P/V identical with the comparative example 2 that coke ratio is 350kg/t.
Even if according to above result it was confirmed formed low coke ratio low reduction material than time also can
Enough reduce aeration resistance.
Additionally, in the above-described embodiment, the charge weight V every time rotatednAnd charging feedstock
The radius increments Δ R every time rotated falling radius is fixing in each example, but only
L to be metav2(n+1) ＜ Lav2N the relation of (), even if the most suitably changing rotation every time
Vn, Δ R, it is also possible to obtain the effect of the present invention without any problems.
The explanation of reference
10 ... blast furnace；12a～12c ... furnace top bin；13 ... flow adjusts 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 crucible；36 ... charging feedstock；37 ... punching
Bar；38 ... load charger；39 ... droppings sampler；40 ... gas mixer；41…
Gas analyzing apparatus；42 ... thermocouple.
Claims (2)
1. the method to blast furnace charging feedstock, it is characterised in that
The coke of more than 2 batches will be divided into load to 1 time of blast furnace charging feedstock charging, 2 batches
Secondary above Ore loads, and uses swivel chute to carry out in the multiple batches of loading loaded, and is suitable for and counter inclines
When this coke is loaded by dynamic loading and the loading of this Ore cuts out simultaneously and carries out,
Make the average thickness every time rotated of the above-mentioned swivel chute obtained by Formula 1 below
Lav1, it is less than the thickness h of the coke of the axle central part being encased in blast furnace,
Lav1It is in the scope of 0.7～0.95 times of h,
Lav1=Vn/〔(Rn 2-Rn-1 2)π〕···1
Here, Vn: charge weight (the t)/coke of this rotation that n-th rotates mixes with Ore
Apparent density (the t/m of layer3),
Rn: n-th rotate charging feedstock fall radius (m).
2. the method to blast furnace charging feedstock, it is characterised in that
The coke of more than 2 batches will be divided into load to 1 time of blast furnace charging feedstock charging, 2 batches
Secondary above Ore loads, and uses swivel chute to carry out in the multiple batches of loading loaded, and is suitable for and counter inclines
When this coke is loaded by dynamic loading and the loading of this Ore cuts out simultaneously and carries out,
When n is set to arbitrary natural number, make the above-mentioned swivel chute obtained by Formula 2 below
N-th rotate average thickness Lav2(n), (n+1)th time obtained by Formula 3 below
Average thickness L rotatedav2(n+1) Formula 4 below is met,
Lav2And L (n+1)av2N the ratio of () is in the scope of 0.5～0.9,
Lav2(n)=Vn/〔(Rn 2-Rn-1 2)π〕···2
Lav2(n+1)=Vn+1/〔(Rn+1 2-Rn 2)π〕···3
Here, Vn: the charging feedstock volume (m of this rotation that n-th rotates3),
Rn-1: (n-1)th time rotate charging feedstock fall radius (m),
Rn: n-th rotate charging feedstock fall radius (m),
Vn+1: the charging feedstock volume (m of this rotation that (n+1)th time rotates3),
Rn+1: (n+1)th time rotate charging feedstock fall radius (m),
Lav2(n+1) ＜ Lav2(n)···4。
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012114860 | 2012-05-18 | ||
| JP2012-114862 | 2012-05-18 | ||
| JP2012114862 | 2012-05-18 | ||
| JP2012-114860 | 2012-05-18 | ||
| PCT/JP2013/003165 WO2013172042A1 (en) | 2012-05-18 | 2013-05-17 | Method for loading raw material into blast furnace |
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| CN104302787A CN104302787A (en) | 2015-01-21 |
| CN104302787B true CN104302787B (en) | 2016-10-05 |
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| JP (1) | JP5574064B2 (en) |
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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 |
| KR102090886B1 (en) * | 2015-10-28 | 2020-03-18 | 제이에프이 스틸 가부시키가이샤 | Method of charging raw material into blast furnace |
| US20220163260A1 (en) * | 2019-04-03 | 2022-05-26 | Jfe Steel Corporation | Blast furnace fault determination apparatus, method for determining fault in blast furnace, and method for operating 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| JPS5910402B2 (en) | 1978-12-08 | 1984-03-08 | 川崎製鉄株式会社 | How to operate a blast furnace with mixed charges |
| JPS5910402A (en) | 1982-07-10 | 1984-01-19 | Toshiba Corp | Rolling mill and rolling method |
| JPS61243107A (en) * | 1985-04-19 | 1986-10-29 | Nippon Kokan Kk <Nkk> | Method for charging raw material to blast furnace |
| JP2820478B2 (en) | 1990-01-16 | 1998-11-05 | 川崎製鉄株式会社 | Feeding method for bellless 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 |
| JP3565172B2 (en) * | 2001-02-28 | 2004-09-15 | Ｊｆｅスチール株式会社 | How to put blast furnace raw materials inside the furnace |
| 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 |
| JP2005060797A (en) * | 2003-08-18 | 2005-03-10 | Jfe Steel Kk | Method for charging material to blast furnace |
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| KR20150004907A (en) | 2015-01-13 |
| CN104302787A (en) | 2015-01-21 |
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| EP2851437A1 (en) | 2015-03-25 |
| TR201816178T4 (en) | 2018-11-21 |
| KR101592955B1 (en) | 2016-02-11 |
| JPWO2013172042A1 (en) | 2016-01-12 |
| EP2851437B1 (en) | 2018-10-03 |
| WO2013172042A1 (en) | 2013-11-21 |
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