CN108265143B - A kind of loading method preventing blast-furnace shaft knot thickness - Google Patents
A kind of loading method preventing blast-furnace shaft knot thickness Download PDFInfo
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- CN108265143B CN108265143B CN201810297652.4A CN201810297652A CN108265143B CN 108265143 B CN108265143 B CN 108265143B CN 201810297652 A CN201810297652 A CN 201810297652A CN 108265143 B CN108265143 B CN 108265143B
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- 238000011068 loading method Methods 0.000 title claims abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 37
- 239000011707 mineral Substances 0.000 claims abstract description 37
- 230000035699 permeability Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 24
- 239000000571 coke Substances 0.000 claims description 23
- 239000004744 fabric Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 239000008188 pellet Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000004907 flux Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000000867 larynx Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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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
- C21B5/008—Composition or distribution of the charge
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a kind of loading methods for preventing blast-furnace shaft knot thickness, it is mineral aggregate separation a part that high temperature metallurgical properties are best, it is individually packed into shaft furnace charging, and pass through the variation at distributor chute inclination angle and stockline, the mineral aggregate for keeping this part high temperature metallurgical properties separated best falls in furnace wall edge, mixed ore is far from furnace wall region, the mineral aggregate for only having single high temperature metallurgical properties best to the region close to furnace wall, not only softening section is narrow, and good permeability, shaft wall accretion can be effectively prevented.According to the technical solution of the present invention, the mineral aggregate for only having single high temperature metallurgical properties best close to the region of furnace wall, not only softening section is narrow, but also good permeability, and shaft wall accretion can be effectively prevented.The stable smooth operation that the present invention can keep blast furnace long-term reduces consumption to increase yield, improves environment, reduces labor intensity.
Description
Technical field
The present invention relates to technical field of blast furnace process, and in particular to a kind of loading method for preventing blast-furnace shaft knot thickness.
Background technique
In blast furnace shaft furnace type countercurrent reactor, the crude fuel (sintering+pelletizing+lump ore+coke) being added from furnace roof, by
(air that the reducing gas is blasted by air blower heats up by hot-blast stove through wind for the effect of upstream high-temperature reducing gas
Mouth enters blast furnace, and combustion reaction occurs with the coke of blast furnace and generates coal gas), be constantly heated, decompose, restoring, softening, melting,
Drippage, carburizing simultaneously ultimately form slag iron melt body and separate.
The region for generating a series of above-mentioned furnace charge change in shape, depending on distribution and furnace charge sheet of the temperature field in furnace charge
Body Chemical composition and physical property.Furnace charge generally passes through 5 regions: 1. lump zone or dry area；2. cohesive zone, i.e. furnace charge are from heating
After-tack is to the region of fusion process；Enter 3. dropping zone, i.e. slag iron drop through coke layer in drop state after melting completely
Region before cupola well；4. air port combustion zone is the region that fuel combustion generates high temperature heat and gaseous reducing agent；5. slag iron is stored up
Tibetan area is the region of slag iron melt body storage.
Due to the influence of various factors, the temperature field of blast furnace can change, and the chemical analysis of blast furnace burden and molten
Changing temperature can also change.Simultaneously under the cooling effect of blast-furnace shaft cooling water, the slag iron of liquid will be solidified and be bonded
On furnace wall, accretion is formed, over time, thick region is tied and gradually increases, form full wafer and completely tie thick region.
After shaft wall accretion, the stable operation of blast furnace is greatly destroyed, and labor intensity sharply increases, energy consumption level
It is substantially increased, and causes blast furnace not normal.And shaft wall accretion deal with it is very difficult, part blast furnace treatment process be up to 1 year,
Loss is very big.Therefore in practical work process, Yao Jinliang avoids shaft wall accretion.It is obtained currently, having by using combining upper and lower
It obtains stronger edge Gas Flow and handles shaft wall accretion with the method that the thick position of control knot and its intensity of cooling below combine,
The method for having the elimination knot adjusted by lower part and combined with top adjustment thick.But generally existing complex procedures, it is inefficient
The problem of.
Summary of the invention
The purpose of the present invention is to provide one kind can be formulated rationally, and energy consumption reduces, enhancement of environment prevents blast-furnace shaft
Tie thick loading method.
The present invention is implemented as follows:
A kind of loading method preventing blast-furnace shaft knot thickness is mineral aggregate separation a part that high temperature metallurgical properties are best,
It is individually packed into shaft furnace charging, and passes through the variation at distributor chute inclination angle and stockline, make this part high temperature smelting separated
The best mineral aggregate of golden performance falls in furnace wall edge, and mixed ore is far from furnace wall region, to only have close to the region of furnace wall single
The best mineral aggregate of high temperature metallurgical properties, it is narrow not only to soften section, but also good permeability, and shaft wall accretion can be effectively prevented.
Further scheme is:
By three independent furnace charges of a batch of material point, i.e. coke, the high temperature metallurgical properties separated best mineral aggregate and mixing
Ore, by arriving furnace top material tank for blast furnace on charging belt or feeding cart, by adjusting distributor chute inclination angle and stockline, so that burnt
Charcoal is covered with entire furnace throat region, and for the best mineral aggregate cloth of the high temperature metallurgical properties separated in furnace wall near zone, mixed ore is remote
From furnace wall.
Further scheme is:
Specific implementation step is as follows:
(1) according to the best mineral aggregate of coke, the high temperature metallurgical properties separated, mixed ore point when stocking up under blast furnace
It opens；
(2) coke is transported in blast furnace roof material distributing tank first by charging belt or feeding cart, passes through furnace roof cloth
Material chute is covered with entire furnace throat section；
(3) the best mineral aggregate of the high temperature metallurgical properties separated is transported to State of Blast Furnace by charging belt or feeding cart
It pushes up in cloth batch can, inclination angle and stockline by top distributing chute, the mineral aggregate for keeping the high temperature metallurgical properties separated best are fallen in
The most edge in furnace throat section, the cloth annulus of the best mineral aggregate of the high temperature metallurgical properties separated account for entire furnace throat sectional area
Region；
(4) mixed ore is transported in blast furnace roof material distributing tank by charging belt or feeding cart, passes through furnace roof cloth
Expect chute cloth in region of the furnace throat section far from furnace wall.Pressing furnace throat sectional area and dividing size is 2/11-9/11 or so；Make composite ore
Stone is not close to furnace wall；
(5) feeding is uninterruptedly carried out in cycles according to above method, Wall of Blast Furnace region will only have single separation
The best mineral aggregate of the high temperature metallurgical properties opened, softening start temperature is high, and softening section is narrow, can not only effectively prevent shaft knot
Thickness, and be conducive to improve the gas permeability of stock column.
Further scheme is:
The best mineral aggregate of the high temperature metallurgical properties is generally sinter, and because of resource difference, also having part blast furnace is ball
Nodulizing.
Further scheme is:
The mixed ore be include the high temperature metallurgical properties that do not separate best mineral aggregate and other ores.General packet
Include sinter+pellet+lump ore.The essence namely ore separation part that high temperature metallurgical properties are best, the portion not separated
Divide and is mixed with other ores and material.
Further scheme is:
The best mineral aggregate of the high temperature metallurgical properties separated accounts for the 40- of the total amount of the best mineral aggregate of high temperature metallurgical properties
60%.
The principle of the present invention is described in further detail below.
In blast furnace, coke is that stock column is saturating always from blast furnace is entered although there is partial gasification during from top to down
The skeleton of gas.But ore has greatly changed, and the cohesive zone softened in drip process is not only the worst area of gas permeability
Domain, and the main region for causing shaft to bond.Shaft bonds in order to prevent, while improving the gas permeability of stock column, should contract as far as possible
The softening section of small ore.
Shaft furnace charging generally comprises sinter, pellet and lump ore.The reflow conductor roll of these three ores is different, and softening starts
Temperature and softening section are different, and for most of steel mill, due to the limitation of resource, sinter high-temperature behavior is best,
Pellet takes second place, and lump ore is worst.The softening section of three kinds of ores is different, and to prevent shaft bonding best bet is to make composite ore
The softening section of stone is minimum, especially makes the list that high temperature metallurgical properties are best using single ore in the region close to furnace wall
At furnace throat edge, (ore that most blast furnaces use is that sinter high temperature metallurgical properties are best to one ore cloth, also there is part height
Furnace is that metallurgical properties are optimal), it is closer to furnace wall and gradually moves down, prevent the ore of high temperature metallurgical properties difference (general
It is lump ore) fall on edge.
According to the technical solution of the present invention, the mineral aggregate for only having single high temperature metallurgical properties best close to the region of furnace wall,
Not only softening section is narrow, but also good permeability, and shaft wall accretion can be effectively prevented.The stabilization that the present invention can keep blast furnace long-term
Direct motion reduces consumption to increase yield, improves environment, reduces labor intensity.
Detailed description of the invention
Fig. 1 is that furnace throat section of the present invention divides schematic diagram；
Fig. 2 is 2 different cultivars ore of embodiment of the present invention mixing softening section comparison diagram；
Fig. 3 is the sintering of 3 single variety of the embodiment of the present invention and mixture charge softening section comparison diagram.
Specific embodiment
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of loading method preventing blast-furnace shaft knot thickness, comprising:
(1) (pyrometallurgy is accounted for according to the best mineral aggregate of coke, the high temperature metallurgical properties separated when stocking up under blast furnace
The best mineral aggregate of performance is always sintered the 40-60% of weight), mixed ore (sinter+pellet+lump ore+other).Meanwhile such as
Shown in attached drawing 1, furnace throat is divided into first area 1, second area 2, third region 3 from center to edge, 3 region of third region accounts for
The 2/11-3/11 of furnace throat sectional area；First area 1 accounts for 2/11 or so of furnace throat sectional area, and rest part is second area 2.
(2) coke is transported in blast furnace roof material distributing tank first by charging belt or feeding cart, passes through furnace roof cloth
Material chute requires to be covered with entire furnace throat section according to certain technique, that is, is covered with first area 1, second area 2 and third region
3。
(3) the best mineral aggregate of the high temperature metallurgical properties separated the 40-60% of sintering amount (Zhan always) is passed through into charging belt
Or feeding cart is transported in blast furnace roof material distributing tank, inclination angle and stockline by top distributing chute make the high temperature separated
The best mineral aggregate of metallurgical performance falls in the most edge in furnace throat section, i.e., in third region 3, the width of cloth annulus accounts for entire furnace
The region 2/11-3/11 of larynx sectional area.
(4) mixed ore (sinter+pellet+lump ore+other) is transported to height by charging belt or feeding cart
In furnace roof material distributing tank, require cloth in region 2/ of the furnace throat section far from furnace wall according to certain technique by top distributing chute
Or so region, i.e. second area 2.Make mixed ore not close to furnace wall.
(5) feeding is uninterruptedly carried out in cycles according to above method, Wall of Blast Furnace region will only have single high temperature
The best mineral aggregate of metallurgical performance, softening start temperature is high, and softening section is narrow, can not only effectively prevent shaft wall accretion, and
Be conducive to improve the gas permeability of stock column.
With two more specific embodiments, the present invention is further illustrated below.
Embodiment 2
Certain 4100m3Shaft furnace charging example.
Certain 4100m3Blast furnace is coke 24t/ batches (containing small coke 3t/ batches) using materials structure, and ore 130t/ batches, ore is matched
Than are as follows: sintering 74%, pelletizing 12%, lump ore 13.5%, flux 0.5%.I.e. every batch of mine is 96.2 tons, pellet 15.6 of sintering
Ton, 17.55 tons of lump ore, 0.55 ton of flux.Each ore high temperature metallurgical properties are as follows:
| Mine kind | Soften start temperature DEG C | Soften finishing temperature DEG C | Soften section DEG C |
| Sinter | 1230 | 1331 | 101 |
| Pellet | 1150 | 1253 | 103 |
| Lump ore | 1030 | 1225 | 195 |
| Composite ore | 1030 | 1331 | 301 |
(1) according to coke, single variety sintering the 50% of sintering amount (Zhan always), mixed ore (sintering when stocking up under blast furnace
Mine+pellet+lump ore+flux+small coke).
(2) first 22 tons of coke are transported in blast furnace roof material distributing tank by charging belt or feeding cart, pass through furnace roof
Distributor chute requires to be covered with entire furnace throat section according to certain technique.
(3) single variety is sintered 48.1 tons, is transported in big blast furnace roof material distributing tank by charging belt or feeding cart, led to
Inclination angle and the stockline for crossing top distributing chute make the sinter of single variety fall in the most edge in furnace throat section, the width of cloth annulus
Degree, accounts for 2.5/11 region of entire furnace throat sectional area.
(4) mixed ore is (48.1 tons of sinter, 15.6 tons of pellet, 17.55 tons of lump ore, 0.65 ton of flux, small by burnt 3
Ton) it is transported in big blast furnace roof material distributing tank by charging belt or feeding cart, by top distributing chute according to certain work
Skill requires the region of the region 2.5/11-9/11 of cloth in furnace throat section far from furnace wall or so.Make mixed ore not close to furnace wall.
(5) feeding is uninterruptedly carried out in cycles according to above method, Wall of Blast Furnace region will only have single sintering
Mine, softening start temperature is high, and softening section is narrow, can not only effectively prevent shaft wall accretion, and is conducive to improve stock column
Gas permeability.
By the above loading method, as shown in Fig. 2, the single variety ore softening section close to furnace wall region only has 101
DEG C, far below 301 DEG C of mixture charge, furnace wall knot thickness is effectively prevented, ensure that the stable smooth operation of blast furnace.
Embodiment 3: certain 2200m3Shaft furnace charging example.
Certain 2200m3Blast furnace is coke 12t/ batches (containing small coke 1.6t/ batches) using materials structure, and ore 70t/ is criticized, ore
Proportion are as follows: sintering 75%, pelletizing 12%, lump ore 13%,.I.e. every batch of mine is 52.5 tons, 8.4 tons of pellet, lump ore 9.1 of sintering
Ton.Each ore high temperature metallurgical properties are as follows:
| Mine kind | Soften start temperature DEG C | Soften finishing temperature DEG C | Soften section DEG C |
| Sinter | 1233 | 1336 | 103 |
| Pellet | 1145 | 1250 | 105 |
| Lump ore | 1035 | 1235 | 200 |
| Composite ore | 1035 | 1336 | 301 |
(1) according to coke, single variety sintering the 40% of sintering amount (Zhan always), mixed ore (sintering when stocking up under blast furnace
Mine+pellet+lump ore+flux+small coke).
(2) first 10.4 tons of coke are transported in blast furnace roof material distributing tank by charging belt or feeding cart, pass through furnace
Top distributor chute requires to be covered with entire furnace throat section according to certain technique.
(3) single variety is sintered 21 tons, is transported in big blast furnace roof material distributing tank, is passed through by charging belt or feeding cart
The inclination angle of top distributing chute and stockline make the sinter of single variety fall in the most edge in furnace throat section, the area of cloth annulus,
Account for 2/11 region of entire furnace throat sectional area.
(4) mixed ore (31.5 tons of sinter, 8.4 tons of pellet, 9.1 tons of lump ore, burnt 1.6 tons small) is passed through into feeding skin
Band or feeding cart transport in big blast furnace roof material distributing tank, require cloth in furnace throat according to certain technique by top distributing chute
Region area of the section far from furnace wall is in the region of 2/11-9/11 or so.Make mixed ore not close to furnace wall.
(5) feeding is uninterruptedly carried out in cycles according to above method, Wall of Blast Furnace region will only have single sintering
Mine, softening start temperature is high, and softening section is narrow, can not only effectively prevent shaft wall accretion, and is conducive to improve stock column
Gas permeability.
By the above loading method, as shown in Fig. 3, the single variety ore softening section close to furnace wall region only has 103
DEG C, far below 301 DEG C of mixture charge, furnace wall knot thickness is effectively prevented, ensure that the stable smooth operation of blast furnace.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiment of the present invention are not limited by the above embodiments, it should be appreciated that those skilled in the art
Member can be designed that a lot of other modification and implementations, these modifications and implementations will fall in principle disclosed in the present application
Within scope and spirit.
Claims (1)
1. a kind of loading method for preventing blast-furnace shaft knot thickness, it is characterised in that: separate the best mineral aggregate of high temperature metallurgical properties
A part is individually packed into shaft furnace charging, and passes through the variation at distributor chute inclination angle and stockline, makes this part separated
The best mineral aggregate of high temperature metallurgical properties falls in furnace wall edge, and mixed ore is far from furnace wall region, thus only close to the region of furnace wall
The mineral aggregate for having single high temperature metallurgical properties best, not only softening section is narrow, but also good permeability, and shaft knot can be effectively prevented
It is thick；
Divide a batch of material to three independent furnace charges, i.e. coke, the high temperature metallurgical properties separated best mineral aggregate and mixed ore,
By arriving furnace top material tank for blast furnace on charging belt or feeding cart, by adjusting distributor chute inclination angle and stockline, so that coke cloth
Full entire furnace throat region, the best mineral aggregate cloth of the high temperature metallurgical properties separated is in furnace wall near zone, and mixed ore is far from furnace
Wall；
Specific implementation step is as follows:
(1) separated according to the best mineral aggregate of coke, the high temperature metallurgical properties separated, mixed ore when stocking up under blast furnace；
(2) coke is transported in blast furnace roof material distributing tank first by charging belt or feeding cart, is slipped by roof material distributing
Slot is covered with entire furnace throat section；
(3) the best mineral aggregate of the high temperature metallurgical properties separated is transported to blast furnace roof cloth by charging belt or feeding cart
In batch can, inclination angle and stockline by top distributing chute, the mineral aggregate for keeping the high temperature metallurgical properties separated best fall in furnace throat
The most edge in section, the width of cloth annulus account for the region 2/11-3/11 of entire furnace throat sectional area；
(4) mixed ore is transported in blast furnace roof material distributing tank by charging belt or feeding cart, is slipped by roof material distributing
Slot cloth is in the region of region 2/11-9/11 of the furnace throat section far from furnace wall；Make mixed ore not close to furnace wall；
(5) feeding is uninterruptedly carried out in cycles according to above method, Wall of Blast Furnace region will only have single separate
The best mineral aggregate of high temperature metallurgical properties, softening start temperature is high, and softening section is narrow, can not only effectively prevent shaft wall accretion, and
And be conducive to improve the gas permeability of stock column；
The best mineral aggregate of the high temperature metallurgical properties is sinter, or is pellet；
The mixed ore be include the high temperature metallurgical properties that do not separate best mineral aggregate and other ores；
The best mineral aggregate of the high temperature metallurgical properties separated accounts for the 40-60% of the total amount of the best mineral aggregate of high temperature metallurgical properties.
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| CN201810297652.4A CN108265143B (en) | 2018-03-30 | 2018-03-30 | A kind of loading method preventing blast-furnace shaft knot thickness |
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| CN201810297652.4A CN108265143B (en) | 2018-03-30 | 2018-03-30 | A kind of loading method preventing blast-furnace shaft knot thickness |
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| CN108265143B true CN108265143B (en) | 2019-10-25 |
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| CN115584370B (en) * | 2022-09-01 | 2023-10-13 | 武安市裕华钢铁有限公司 | Method for improving air permeability of soft melting belt in large-slag-quantity smelting of blast furnace |
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| JPS6043402B2 (en) * | 1982-07-15 | 1985-09-27 | 川崎製鉄株式会社 | Blast furnace raw material charging method |
| CN102010920A (en) * | 2010-12-24 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
| CN105803142B (en) * | 2016-05-11 | 2018-05-01 | 武汉钢铁有限公司 | The burnt mixing loading method of large blast furnace gradation level ore deposit |
| CN107119163A (en) * | 2017-06-08 | 2017-09-01 | 唐山钢铁集团有限责任公司 | A kind of Burden distribution method of blast furnace of pelletizing at high proportion |
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