CN106119449A - A kind of blast furnace whole world group smelting process - Google Patents
A kind of blast furnace whole world group smelting process Download PDFInfo
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- CN106119449A CN106119449A CN201610731518.1A CN201610731518A CN106119449A CN 106119449 A CN106119449 A CN 106119449A CN 201610731518 A CN201610731518 A CN 201610731518A CN 106119449 A CN106119449 A CN 106119449A
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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
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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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
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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Abstract
The present invention relates to a kind of blast furnace whole world group smelting process, concrete technology is to add blast furnace by after the mixing of fluxed pellets, slag and limestone from furnace roof, coke and Ore are dividedly in some parts in blast furnace, smelting process adjusts coke batch weight and injecting coal quantity size, any one distributing mode in annular, fixed point, sector is realized by blast furnace material distribution chute, control shape of charge level, form edge and center twice flow pattern；Blast furnace will be sent into through hot air duct after >=1150 DEG C of high-temperature hot-air pressurizations, and make coke and coal dust firing participate in blast furnace internal oxidition reduction reaction；Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole.The present invention cancels sintering deposit, uses fluxed pellets 80 100% part by weight to carry out blast furnace process, reduces environmental pollution and reduction process energy consumption in sintering deposit production process.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of blast furnace whole world group smelting process.
Background technology
China promises to undertake that to the world the year two thousand twenty reduces discharging CO240-45% is reduced than 2005.China's Bf Burden is with greatly
Ratio sintering deposit is main, existing iron ore powder sintering production technology many uses continuous pallettype sintering machine, uses and is directly exposed in environment
Convulsion refrigerating mode produces, and sintering system leaks out, exhausted air quantity is big, dust is many, pollutant are many, and intractability is greatly, costly
Etc. the difficult problem becoming environmental improvement.Producing about 1,000,000,000 tons of sintering deposit at present per year, sintering deposit per ton discharges 3000-5000m3Flue gas, one
Year reaches 30000-50000 hundred million to harmful sintering flue gases such as airborne release carbonated, oxysulfide, nitrogen oxides, two English
m3.But desulphurization plant is uneven, operating cost is high, and the harmful gas such as nitrogen oxides and two English there is no effective purification and pushes away
Wide way, causes the foul pollution of environment, and healthy to our people causes the biggest threat.And prepared by fluxed pellets
Process ton ore deposit smoke discharge amount is at 2000-3000m3, process energy consumption reduces 20-30kgce/t, and the few intractability of exhaust gas volumn is low, with
Time reduce process energy consumption, reduce CO2Discharge capacity.The western countries such as American-European in order to reduce the environmental pollution of sintering production process, by
Step be decreased or turned off sintering machine and based on pellet smelting.Therefore, from protection environment, energy-saving and emission-reduction overall situation we want
Change at present State of Blast Furnace based on sintering deposit and smelt pattern, progressively transition be eco-friendly pelletizing production be the blast furnace smelting led
Refining pattern.
The Iron Ore Powder resource of China be based on lean ore final election after iron ore concentrate, granularity is more carefully suitable to pelletizing.Pelletizing production
Process energy consumption 20-30kg lower than sintering circuit energy consumption marks coal/t, is about the 50% of sintering circuit, pelletizing operation pollutant emission
It is also only the 50% of sintering circuit, is the mode of production of clean low consumption compared with sintering deposit production.
Fluxed pellets production technology is sealing setting of circulation Iron Ore Powder through grate kiln or belt type roasting machine
Carry out roasting on Bei, can greatly reduce environmental pollution and operation consumption.Current domestic blast furnace uses vast scale sintering deposit, pelletizing
Ore deposit ratio is averagely about 15%, and Taiyuan Iron and Steel Co., Shoudu Iron and Steel Co capital Tang etc. are less than 30%, and domestic extremely indivedual small furnace pellet ratios reach
About 45%.Research and development one can not use sintering deposit, and uses whole world group blast furnace smelting process, and smelting in blast furnace can
To reduce slag ratio, reduce fuel consumption, reduce CO2Discharge capacity, is the blast furnace process pattern of energy-conserving and environment-protective.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides the iron-smelting process that a kind of whole world group smelts, and this technique is with energy consumption relatively
Low, to discharge less pellet be that raw material carries out blast furnace process, improves the economic benefit of ore smelting while reducing discharge.
The present invention adopts the following technical scheme that, a kind of blast furnace whole world group smelting process, comprises the steps:
1) fluxed pellets being pressed 80-100% mass ratio, lump ore presses 0-20% mass ratio, slag and limestone according to 0-10%
Add blast furnace from furnace roof after mass ratio mixing；
2) ensure smelting demand based on ore batch weight, coke and Ore are dividedly in some parts in blast furnace, smooth for ensureing blast furnace process
Carry out, realize by adjusting coke batch weight and injecting coal quantity size；
3) realize any one distributing mode in annular, fixed point, sector by blast furnace material distribution chute, control shape of charge level, shape
Become edge and center twice flow pattern；
4) use exhaust gas of hot-blast stove preheating coal gas and air, combustion heating air stove, will after hot air furnace heat exchange >=1150
DEG C high-temperature hot-air, sends into blast furnace through hot air duct after pressurization, makes coke and coal dust firing participate in blast furnace internal oxidition reduction reaction；
5) in air blast Control for Oxygen Content at 21%-35%；
6) Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly
Reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole.
Technique of the present invention can reach blast furnace process slag ratio 185-300kg/t, and fuel ratio 450-480kg/t's is the lowest
Consumption smelting pattern.
Process continuity of the present invention produces containing Si:0.1-0.5%, containing Fe >=99.45%, excellent containing S:0.01-0.03%
Matter molten iron.
Step 2 of the present invention) in the 1/3-1/5 that coke batch weight is ore batch weight.
Step 2 of the present invention) in injecting coal quantity be 100-220kg/t.
Step 2 of the present invention) in ore batch weight in pellet weight percent accounting be 80-100%.
High-temperature hot-air in step 4) of the present invention, air quantity 1500-8000m/min, blast 200-500kpa.
The mentality of designing of the present invention:
1, broken final election be need not for steel plant's iron content solid waste such as slags and enter sintering for agglumeration, can be direct as flux
It is broken into suitable particle size and enters blast furnace process, both can reclaim ferrum element resource, can reduce again and re-sinter the energy wave caused
Take.
2, in terms of cloth: owing to pellet has good rollability, natural angle of rest (repose) only has 35-40。, at blast furnace material distribution
During need to realize annular, fixed point, the distributing mode such as fan-shaped by distributor chute, control rational shape of charge level, development is closed
The edge of reason and center twice flow pattern, blast furnace gas utilization rate controls more than 43%.
3, in terms of blast furnace process: whole world group steelmaking furnace cohesive zone position is high, soften interval width and can cause blast furnace stock column
Breathability changes the most greatly, smelts with vast scale sintering deposit and is very different, and indirect reduction and direct-reduction to blast furnace burden are made
Become impact, need to control reasonable blowing system and thermal system.
4, in terms of slagging regime: the smelting of whole world group has the less quantity of slag, and quality and composition to blase furnace cast iron cause
The biggest impact.The quantity of slag I haven't seen you for ages cause desulfurization difficulty, molten iron S content severe overweight, cause iron quality accident.By controlling slag
Basicity 1.0-1.5 level adjusts pig iron composition.
5, in terms of iron quality control: in the case of just producing product, it is ensured that in molten iron chemical composition, Si content is at 0.1-
0.5%, Fe content is 99.45%, and S content is at 0.01-0.03%.
Use having the beneficial effects that of technique scheme: 1. cancel sintering deposit, use fluxed pellets 80-100% weight
Ratio, slag and limestone carry out blast furnace process according to 0-10% part by weight, reduce environmental pollution in sintering deposit production process
With reduction process energy consumption.2. economic and technical norms are excellent, blast furnace process slag ratio 185-300kg/t, fuel ratio 450-480kg/t's
Efficient low-consume smelts pattern, can reduce CO further2Discharge capacity.3. consecutive production Si content is at 0.1-0.5%, Fe content
>=99.45%, S content is at 0.01-0.03% high-quality molten iron.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further details.
The invention provides a kind of blast furnace whole world group smelting process, it is therefore intended that cancel existing high pollution maximum discharge sintering deposit
Production technology, uses the pellet blast furnace process pattern of relative clean.Use existing blast furnace process pattern and the blast furnace smelting of whole world group
Refining difference is shown in Table 1
Table 1 existing blast furnace process pattern and the blast furnace process contrast of whole world group
Embodiment 1
With 450m3As a example by blast furnace:
A kind of blast furnace whole world group smelting process, comprises the steps:
1) by 80% mass ratio, lump ore, fluxed pellets being pressed 15% mass ratio, slag and limestone are according to 5% part by weight
Add blast furnace from furnace roof after mixing, feed grade 61.85%；
2) coke and Ore being dividedly in some parts in blast furnace, ore batch weight is 25t/t, and coke batch weight is 1/5 for ore batch weight, spray
Coal amount is 133kg/t；
3) realize annular distributing mode by blast furnace material distribution chute, control shape of charge level, form edge and center twice air-flow mould
Formula；
4) use exhaust gas of hot-blast stove preheating coal gas and air, combustion heating air stove, will be after hot air furnace heat exchange, 1151 DEG C
Send into blast furnace, air quantity 1558m/min, blast 241kpa through hot air duct after high-temperature hot-air pressurization, make coke and coal dust firing ginseng
With blast furnace internal oxidition reduction reaction；
5) in air blast Control for Oxygen Content 21%, oxygen enrichment percentage 2.41%；
6) Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly
Reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole, capacity factor of a blast furnace 4.01t/m3D, molten iron temperature 1493 DEG C,
Si content 0.35%, Fe content 99.45%, S content 0.028%.
The present embodiment can reach blast furnace process slag ratio 201kg/t, and the efficient low-consume of fuel ratio 461kg/t smelts pattern.
Embodiment 2
With 450m3As a example by blast furnace:
A kind of blast furnace whole world group smelting process, comprises the steps:
1) fluxed pellets is pressed 7% mass ratio, slag and limestone mixed according to 3% part by weight by 90% mass ratio, lump ore
Add blast furnace from furnace roof after conjunction, feed grade 60%；
2) coke and Ore being dividedly in some parts in blast furnace, ore batch weight is 25t/t, and coke batch weight is 1/3 for ore batch weight, spray
Coal amount is 100kg/t；
3) realize fan-shaped distributing mode by blast furnace material distribution chute, control shape of charge level, form edge and center twice air-flow mould
Formula；
4) use exhaust gas of hot-blast stove preheating coal gas and air, combustion heating air stove, will be after hot air furnace heat exchange, 1180 DEG C
Send into blast furnace, air quantity 1620m/min, blast 253kpa through hot air duct after high-temperature hot-air pressurization, make coke and coal dust firing ginseng
With blast furnace internal oxidition reduction reaction；
5) in air blast Control for Oxygen Content 28%；Oxygen enrichment percentage 7%；
6) Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly
Reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole, capacity factor of a blast furnace 3.91t/m3D, molten iron temperature 1502 DEG C,
Si content 0.1%, Fe content 99.82%, S content 0.010%.
The present embodiment can reach blast furnace process slag ratio 297kg/t, and the efficient low-consume of fuel ratio 480kg/t smelts pattern.
Embodiment 3
With 450m3As a example by blast furnace:
A kind of blast furnace whole world group smelting process, comprises the steps:
1) by 100% mass ratio, lump ore, fluxed pellets being pressed 0% mass ratio, slag and limestone are according to 0% part by weight
Add blast furnace from furnace roof after mixing, feed grade 62%；
2) coke and Ore being dividedly in some parts in blast furnace, ore batch weight is 25t/t, and coke batch weight is 1/4 for ore batch weight, spray
Coal amount is 220kg/t；
3) realize fixed point distributing mode by blast furnace material distribution chute, control shape of charge level, form edge and center twice air-flow mould
Formula；
4) use exhaust gas of hot-blast stove preheating coal gas and air, combustion heating air stove, will be after hot air furnace heat exchange, 1250 DEG C
Send into blast furnace, air quantity 1580m/min, blast 250kpa through hot air duct after high-temperature hot-air pressurization, make coke and coal dust firing ginseng
With blast furnace internal oxidition reduction reaction；
5) in air blast Control for Oxygen Content 35%；Oxygen enrichment percentage 14%；
6) Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly
Reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole, capacity factor of a blast furnace 4.0t/m3D, molten iron temperature 1520 DEG C,
Si content 0.4%, Fe content 99.51%, S content 0.028%.
The present embodiment can reach blast furnace process slag ratio 188kg/t, and the efficient low-consume of fuel ratio 455kg/t smelts pattern.
Because the present invention has industry universality, the applied blast furnace of the present invention is not limited to above-mentioned furnace volume, to all appearances
Long-pending blast furnace is the most about scheduled in the scope of the claims of the present invention.
Above example is only in order to illustrative not limiting technical scheme, although with reference to above-described embodiment to this
Bright be described in detail, it will be understood by those within the art that: still the present invention can be modified or etc.
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should contain the power in the present invention
In the middle of profit claimed range.
Claims (7)
1. a blast furnace whole world group smelting process, it is characterised in that comprise the steps:
1) fluxed pellets being pressed 80-100% mass ratio, lump ore presses 0-20% mass ratio, slag and limestone according to 0-10%
Add blast furnace from furnace roof after mass ratio mixing；
2) ensure smelting demand based on ore batch weight, coke and Ore are dividedly in some parts in blast furnace, smooth for ensureing blast furnace process
Carry out, realize by adjusting coke batch weight and injecting coal quantity size；
3) realize any one distributing mode in annular, fixed point, sector by blast furnace material distribution chute, control shape of charge level, shape
Become edge and center twice flow pattern；
4) use exhaust gas of hot-blast stove preheating coal gas and air, combustion heating air stove, will after hot air furnace heat exchange >=1150
DEG C high-temperature hot-air, sends into blast furnace through hot air duct after pressurization, makes coke and coal dust firing participate in blast furnace internal oxidition reduction reaction；
5) in air blast Control for Oxygen Content at 21%-35%；
6) Ore sequentially passes through lump zone, cohesive zone, dropping zone, air port combustion zone and cupola well in blast furnace and carries out indirectly and directly
Reduction reaction, generates liquid molten iron and discharges out of the furnace through tapping hole.
The blast furnace whole world the most according to claim 1 group smelting process, it is characterised in that: described technique can reach blast furnace process
Slag ratio 185-300kg/t, the efficient low-consume of fuel ratio 450-480kg/t smelts pattern.
The blast furnace whole world the most according to claim 1 group smelting process, it is characterised in that: described process continuity produces and contains
Si:0.1-0.5%, containing Fe >=99.45%, high-quality molten iron containing S:0.01-0.03%.
4. roll into a ball smelting process according to the blast furnace whole world described in claim 1-3 any one, it is characterised in that: described step 2) in
The 1/3-1/5 that coke batch weight is ore batch weight.
5. roll into a ball smelting process according to the blast furnace whole world described in claim 1-3 any one, it is characterised in that: described step 2) in
Injecting coal quantity be 100-220kg/t.
6. roll into a ball smelting process according to the blast furnace whole world described in claim 1-3 any one, it is characterised in that: described step 2) in
Ore batch weight in pellet weight percent accounting be 80-100%.
7. roll into a ball smelting process according to the blast furnace whole world described in claim 1-3 any one, it is characterised in that: in described step 4)
High-temperature hot-air, air quantity 1500-8000m/min, blast 200-500kpa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108929927A (en) * | 2018-08-21 | 2018-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of blast furnace smelting method of the vanadium titano-magnetite of high proportion pellet ore |
| CN112226558A (en) * | 2020-10-12 | 2021-01-15 | 王玉平 | Blast furnace iron-smelting method using high-proportion alkaline pellets and pellet distributing machine |
| CN113265496A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Blast furnace iron-making method using full-acid pellets as raw materials |
| CN117329862A (en) * | 2023-09-27 | 2024-01-02 | 山东钢铁集团永锋临港有限公司 | Lump ore drying system and method taking sintering waste heat as heat source |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108929927A (en) * | 2018-08-21 | 2018-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of blast furnace smelting method of the vanadium titano-magnetite of high proportion pellet ore |
| CN112226558A (en) * | 2020-10-12 | 2021-01-15 | 王玉平 | Blast furnace iron-smelting method using high-proportion alkaline pellets and pellet distributing machine |
| CN113265496A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Blast furnace iron-making method using full-acid pellets as raw materials |
| CN117329862A (en) * | 2023-09-27 | 2024-01-02 | 山东钢铁集团永锋临港有限公司 | Lump ore drying system and method taking sintering waste heat as heat source |
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