CN101724727A - Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources - Google Patents
Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources Download PDFInfo
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- CN101724727A CN101724727A CN200910018446A CN200910018446A CN101724727A CN 101724727 A CN101724727 A CN 101724727A CN 200910018446 A CN200910018446 A CN 200910018446A CN 200910018446 A CN200910018446 A CN 200910018446A CN 101724727 A CN101724727 A CN 101724727A
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 120
- 239000010959 steel Substances 0.000 claims abstract description 120
- 239000003034 coal gas Substances 0.000 claims abstract description 73
- 239000001301 oxygen Substances 0.000 claims abstract description 63
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 63
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 49
- 239000003245 coal Substances 0.000 claims abstract description 40
- 239000002912 waste gas Substances 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 27
- 239000008188 pellet Substances 0.000 claims abstract description 18
- 239000002817 coal dust Substances 0.000 claims abstract description 17
- 230000010354 integration Effects 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 11
- 239000003345 natural gas Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims description 37
- 238000005266 casting Methods 0.000 claims description 36
- 238000009434 installation Methods 0.000 claims description 30
- 238000007670 refining Methods 0.000 claims description 28
- 238000005453 pelletization Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 11
- 230000004048 modification Effects 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 239000003575 carbonaceous material Substances 0.000 claims description 9
- 235000009508 confectionery Nutrition 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 7
- 238000000498 ball milling Methods 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 5
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- 238000001465 metallisation Methods 0.000 claims description 5
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- 238000006243 chemical reaction Methods 0.000 claims description 4
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- 239000003595 mist Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 72
- 229910052742 iron Inorganic materials 0.000 abstract description 32
- 238000004519 manufacturing process Methods 0.000 abstract description 27
- 239000002893 slag Substances 0.000 abstract description 27
- 239000004568 cement Substances 0.000 abstract description 15
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 241001062472 Stokellia anisodon Species 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 description 11
- 239000012256 powdered iron Substances 0.000 description 7
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
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- 239000002918 waste heat Substances 0.000 description 2
- 208000035699 Distal ileal obstruction syndrome Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
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- 239000011230 binding agent Substances 0.000 description 1
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical group C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The invention relates to a short-flow environment-friendly plant for steel production with a rotary hearth furnace continuous steelmaking method and equipment as the cores and with noncoking coal or natural gases as the main energy. Coal dust (natural gases, etc.) and oxygen are jetted into a continuous steelmaking furnace to smelt high temperature pre-reduced metallized pellets provided by the rotary hearth furnace to realize continuous steelmaking, and the molten steel is directly manufactured into the finished products by cast-rolling integration equipment after being refined or is manufactured into the finished products by traditional continuous casting and steel rolling. Meanwhile, the high temperature coal gas generated by a continuous steelmaking furnace is used for the pre-reduced pellets provided by the rotary hearth furnace after being reformed and the other part of high temperature reformed coal gas can be used for traditional continuous casting and steel rolling heating furnaces. The heat of the high temperature waste gas in the rotary hearth furnace is cascade-utilized to preheat the oxygen-enriched air and the pellets for the rotary hearth furnace. The high temperature waste gas in the steel rolling heating furnace is used for preheating the air for the heating furnace. The iron-containing dust is recycled and the steel slag and other dust are used for manufacturing cement. Therefore, the plant has high comprehensive utilization efficiency of energy, low energy consumption, low production cost, less emission and small total investment, and saves land.
Description
Technical field
The present invention relates to the short-flow rotary hearth furnace continuous steelmaking method that steel and steel are produced, relate in particular to a kind of based on mill coal, fully utilize the production method of the complete short process plant steel of the energy, belong to technical field of ferrous metallurgy.
Background technology
Along with the develop rapidly of world steel industry and international community pay attention to day by day to environmental protection, energy-saving and emission-reduction, the shortage of resource such as iron ore, coking coal, people constantly seek a kind of ironmaking or method for making steel without coking coal, seek the complete short process plant method that a kind of waste heat that the secondary energy that various iron dust containings effectively utilize, process produces are effectively utilized, produce utilizes again.
Steel production at present mainly contains short flow process and two kinds of forms of long flow process.The long flow process of tradition is from iron ore, sintering (or pelletizing), coking, blast furnace ironmaking, bessemerizes into crude molten steel, and through refining furnace steel-making, steel rolling is become a useful person again again.The coking coal resource scarcity, in large scale, investment is high, the land occupation area is big, the production cycle is long, energy consumption per ton steel is high, environmental pollution seriously is the drawback that the long flow process of tradition can't overcome.
Short flow process is a raw material with steel scrap, direct-reduced iron (DRI, sponge iron) etc. promptly, by furnace melting, be oxidized to crude molten steel, produce finished steel through refining, continuous casting, stocking, do not need coke, adopting the most generally is that MIDREX, HYL method and the coal of reductive agent is the kiln process, shaft furnace process, rotary hearth furnace method of reductive agent etc. with the Sweet natural gas.The high efficiency of energy utilization, the secondary energy that are produced to each operation process of becoming a useful person by the ore direct steelmaking efficiently utilize again, waste heat efficiently utilizes, the complete short process plant effect of iron dust containing comprehensive utilization but present short flow process does not reach, the comprehensive energy consumption height, the production cost height.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of short-flow rotary hearth furnace continuous steelmaking method that fully utilizes the energy, the present invention also is provided for the equipment of this method.
Summary of the invention
The present invention is main source of energy with the mill coal, with rotary hearth furnace continuous steelmaking method and equipment is core, the secondary energy coal gas of high temperature upgrading that makes full use of the generation of continuous steelmaking method and equipment is that rotary hearth furnace is or/and the coal gas of high temperature that heater for rolling steel is used, rotary hearth furnace high-temperature residual heat waste gas is used for preheating rotary hearth furnace oxygen-rich air and pelletizing preheating, adopt casting integration apparatus or traditional continuous casting steel rolling equipment direct production to go out qualified steel, be used for the coal gas upgrading after low pressure water vapor that produces in the production process or the water at low temperature pressurization, iron content dedusting ash and steel rolling iron scale return pelletizing and make ball, slag and dirt ash are used to make cement, realized from the iron ore to steel, producing a complete set of complete ultrashort flow rotary hearth furnace continuous steelmaking production, can build into less investment according to the inventive method, floor space is little, running cost is low, energy consumption is little, the energy utilization rate height, material all fully utilizes, discharge few environment-friendly type factory.
Raw material among the present invention is the conventional raw material powdered iron ore, iron content dedusting ash, iron scale of rotary hearth furnace continuous steelmaking etc., the unified in this application ferrous material that is called.
Because the present invention relates to begin production method until finished steel from iron ore raw material, wherein related processing step is more, except that the processing condition that clearly limit, the process portion that the present invention does not specify is all by state of the art.
Detailed Description Of The Invention
A kind of short-flow rotary hearth furnace continuous steelmaking method that fully utilizes the energy comprises the material ball milling, prepares burden, makes ball, palletizing shaft furnace preheating, rotary hearth furnace prereduction, continuous steelmaking, and liquid steel refining, continuous casting, rolling becoming a useful person, step is as follows:
1) ferrous material is made ball and is processed into pelletizing after ball milling, batching,
2) rotary hearth furnace ℃ is sent in the pelletizing that obtains of step 1) 850～950 ℃ of heating by the exhaust gases to 3500～450 of being discharged by rotary hearth furnace oxygen-rich air preheater in primary heater unit,
3) in rotary hearth furnace, pelletizing heats through 800～850 ℃ of high temperature upgrading gas-fireds, makes the prereduction metallized pellet of 1000～1200 ℃ of degree of metalization 85～95%, tapping temperature, for the continuous steelmaking stove; 1100 ℃～1200 ℃ high-temp waste gas input oxygen-rich air preheater producing of rotary hearth furnace simultaneously is preheated to 600～700 ℃ to oxygen-rich air and uses for rotary hearth furnace combustion high temperature upgrading coal gas in the oxygen-rich air preheater;
4) the prereduction metallized pellet that rotary hearth furnace the is provided continuous steelmaking stove of packing into sprays into carbonaceous material and oxygen and carries out continuous steelmaking; Behind 1450～1550 ℃ of coal gas of high temperature upgradings that the continuous steelmaking stove produces, the high temperature upgrading coal gas that obtains for rotary hearth furnace or/and the heater for rolling steel use;
5) 1580～1680 ℃ of molten steel of C content 0.01～0.40wt%, temperature of making of continuous steelmaking stove, for LF refining furnace or RH refining furnace, the molten steel casting that refining furnace makes becomes steel after preliminary deoxidation, alloying.
Pack into the temperature of continuous steelmaking stove of the described prereduction metallized pellet of step 4) is 900～1100 ℃.
Described high temperature upgrading coal gas is that 1450～1550 ℃ of coal gas of high temperature that the continuous steelmaking stove produces are flow through the coal dust that suspends in the coal gas upgrading stove, CO
2Produce into CO with the coal dust reaction, absorb heat simultaneously; Water vapor and coal dust reaction generate H
2And CO, absorb heat simultaneously; CO behind the upgrading in the coal gas
2Content is less than 15%, and vapour content is less than 5.0%, 800～850 ℃ of temperature, directly for rotary hearth furnace or/and heater for rolling steel use.
CO in the described coal gas of high temperature
2Content 29～31 volume %, vapour content 11～13 volume %.All the other compositions in the coal gas of high temperature are CO, H
2, CH
4And N
2, its content range is known to those skilled in the art.
Iron content dedusting ash that produces in the production process and steel rolling iron scale utilize as the raw material of step 1) again,
The slag that produces in the production process and other dust are used to make cement as adulterant.
Low-pressure steam that produces in the production process or water at low temperature are used for the coal gas of high temperature upgrading.
The control of furnace waste gas exhaust temperature is not higher than 150 ℃ in the step 1).
Preferably, the described pelletizing of step 1) is the round pelletizing of Φ 8～28mm of balling disk (-sc) preparation, or the briquetting of ball press preparation.Make ball add in the ferrous material in man-hour need to add coal dust, the binding agent routine is made the ball auxiliary material.
Preferably, the micro mist of the described ferrous material of step 1) ball milling to 50～200 μ m uses for making ball.
Preferably, step 2) described carbonaceous material is selected from mill coal coal dust, Sweet natural gas or combustible ice.Combustible ice is gas hydrate, is under certain condition (salinity of suitable temperature, pressure, gas saturation, water, pH value etc.), by the white solid state crystalline material that forms in gas or volatile liquid and the water mutual effect process, and outward appearance picture ice.
Step 2) stove of continuous steelmaking described in can be controlled coal oxygen ratio by adjusting carbonaceous material straying quatity and oxygen straying quatity, and then the generation of control coal gas of high temperature, to satisfy the demand of other operations.Can carry out according to common process, preferably use patent application 200810238696.6,200810249806.9,200810139695.6,200810139696.0 and 200810140082.4 described method and apparatus.
Step 2) the oxygen-rich air preheater of described preheating oxygen-rich air can be a tubular heat exchanger, or the high-performance heat exchanger of other form.
Be used for the specific equipment that the present invention fully utilizes the short-flow rotary hearth furnace continuous steelmaking of the energy, comprise ball mill (2), batch bin (3), balling equipment (4), pelletizing primary heater unit, rotary hearth furnace (6), oxygen-rich air preheater (7), coal powder injection tower (8) or combustible gas storage tank (23), continuous steelmaking stove (9), oxygen generating plant (10), coal gas upgrading equipment (11), refining furnace (12), casting and rolling installation, dust removal installation (19).It is characterized in that, ball mill (2), balling equipment (4), pelletizing primary heater unit, rotary hearth furnace (6), continuous steelmaking stove (9), refining furnace (12) link to each other successively with casting and rolling installation, coal powder injection tower (8) links to each other with continuous steelmaking stove (9), be used for providing the mill coal coal dust to continuous steelmaking stove (9), oxygen generating plant (10) links to each other with continuous steelmaking stove (9), is used for providing oxygen to continuous steelmaking stove (9); Coal gas upgrading equipment (11) is used for the coal gas that continuous steelmaking stove (9) produces is carried out modification; The modification coal gas that coal gas upgrading equipment (11) produces is transported to rotary hearth furnace (6); Dust removal installation (19) links to each other with rotary hearth furnace (6), is used for the waste gas that rotary hearth furnace (6) produces is carried out dedusting.
Preferably, ball mill (2) links to each other with balling equipment (4) through batch bin (3).
Preferably, the flue dust of dust removal installation generation is discharged through chimney (18).
Preferably, also comprise apparatus for treating steel slags (20), apparatus for treating steel slags (20) links to each other with continuous steelmaking stove (9), is used to handle the slag that continuous steelmaking stove (9) produces.
Above-mentioned pelletizing primary heater unit is shaft furnace (5), or chain comb formula preheating oven.
Above-mentioned coal powder injection tower (8) is replaced by combustion gas storage tank (23).
Above-mentioned oxygen generating plant can adopt pressure swing adsorption equipment (production plant's oxygen), perhaps adopts cryogenics equipment (production plant oxygen and argon gas).
Above-mentioned casting and rolling installation mainly is made up of continuous caster (13), heater for rolling steel (14), steel rolling equipment (15), process furnace air preheater (17).As shown in Figure 1.
Above-mentioned casting and rolling installation also can be a casting integration apparatus (22).As shown in Figure 2.Described casting equipment integrating is selected from steel band casting equipment integrating, shaped steel casting equipment integrating, or bar casting equipment integrating.
The steel that use the inventive method and equipment to produce can be steel plate, steel band, shaped steel or bar.
The present invention from the concrete operational path that ferrous materials such as iron ore obtain molten steel continuously is: be main source of energy with the mill coal, with rotary hearth furnace and continuous steelmaking equipment is core, realize that the secondary energy that operation self produces utilize again, the utilization of waste-gas heat tandem, physics heat make full use of, iron dust containing recycle equal energy source and resources effective utilization, produce the ultrashort technical process of qualified steel, the energy saving and environment friendly factory that slag and other dust are used to make cement.Factory has realized comprehensive utilization of energy efficient height, and energy consumption is low, production cost is low, discharge less, gross investment is few, save soil etc., is that ultrashort flow process realizes the model of ore to the energy saving and environment friendly factory of steel, is the revolutionary change of traditional iron and steel metallurgical technology flow process.
Technical characterstic of the present invention and excellent results are as follows:
The present invention is that the short flow process steel production plant that main equipment is formed produces qualified steel by stock yard, ball mill, balling equipment, shaft furnace or chain comb formula preheating oven, rotary hearth furnace, oxygen-rich air preheater, continuous steelmaking stove, oxygen generating plant, coal gas upgrading equipment, refining furnace, casting integration apparatus or traditional continuous casting steel rolling equipment; The steel of being produced can be steel plate, steel band, shaped steel or bar.
(1) the present invention is that core is carried out steel production with rotary hearth furnace and continuous steelmaking equipment, comparing with the long flow process of tradition does not need coking, sintering, blast furnace, converter installation, realized full continuous steelmaking, combine with the casting integration apparatus, be at present known minimum by ore to the energy consumption of steel, send and put minimum, short processes flow process, be a revolutionary technological change of ferrous metallurgy.
(2) the present invention also adopts traditional continuous casting and steel rolling equipment to substitute the casting integration apparatus, produces the steel of various specification of quality.
(3) the present invention has realized with the mill coal being main source of energy, with rotary hearth furnace and continuous steelmaking equipment is core, the target that the secondary energy that produce utilize again, the utilization of waste-gas heat tandem, physics heat make full use of, ton steel comprehensive energy consumption reaches 551 kilograms of mark coals when adopting the casting integration apparatus to produce steel, ton steel comprehensive energy consumption reaches 585 kilograms of mark coals when adopting traditional continuous casting, strand hot delivery and hot charging, process furnace, steel rolling equipment production steel, is the technical process that energy utilization rate is the highest, energy consumption is minimum in the present known iron and steel technical process.
(4) the present invention has realized that iron dust containing recycle, slag and other dust are used to make the environment-friendly type steel production of cement, and emission reduction effect is remarkable.
(5) energy consumption of the present invention is low, production cost is low, discharge less, gross investment is few, save soil, water saving, is the most effective factory flow of energy-saving and emission-reduction, has the stronger market competitiveness.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.Wherein: 1 stock yard, 2 ball mills, 3 batch bins, 4 balling equipments, 5 shaft furnaces, 6 rotary hearth furnaces, 7 oxygen-rich air preheaters, 8 coal powder injection towers, 9 continuous steelmaking stoves, 10 oxygen generating plants, 11 coal gas upgrading equipment, 12 refining furnaces, 13 traditional continuous casters, 14 heater for rolling steel, 15 steel rolling equipments, 16 steel, 17 process furnace air preheaters, 18 chimneys, 19 dust removal installations, 20 slags are handled, 21 cement mill.
Fig. 2 is the another kind of casting of the present invention block diagram of becoming a useful person.Wherein, 22 casting integration apparatus, the casting integration apparatus has substituted traditional continuous casting, heater for rolling steel and steel rolling equipment, other same Fig. 1.
Fig. 3 is an another kind of schematic flow sheet of the present invention.Combustible gas storage tank (23) has replaced coal powder injection tower (8), mill coal coal dust substitute gas, other same Fig. 2.
Embodiment
Following examples are to further specify of the present invention, but the present invention is not limited thereto.
Embodiment 1:
Raw material: ferrous material comprises: powdered iron ore, iron content dedusting ash, iron scale; Carbonaceous material is selected from coal dust; Other raw materials comprise lime, fluorite, rhombspar.
The equipment of factory of the present invention comprises: stock yard 1, ball mill 2, batch bin 3, balling equipment 4, shaft furnace 5, rotary hearth furnace 6, oxygen-rich air preheater 7, coal powder injection tower 8, continuous steelmaking stove 9, oxygen generating plant 10, coal gas upgrading equipment 11, refining furnace 12, traditional continuous caster 13, heater for rolling steel 14, steel rolling equipment 15, steel 16, process furnace air preheater 17, chimney 18, dust removal installation 19, slag handle 20, cement mill 21.As shown in Figure 1.
The flue dust that dust removal installation produces is discharged through chimney 18.
Preheating palletizing shaft furnace 5, can with chain comb formula preheating oven or other more efficiently the pelletizing preliminary heating device replace.
Stock yard 1 powdered iron ore or/and ferrous materials such as iron dust containing, iron scale through ball mill 2 fine grindings delivery feed bin 3 after require granularity, green-ball through balling equipment 4 outputs send shaft furnace 5 to carry out preheating, send rotary hearth furnace 6 prereduction then, metallized pellet after the prereduction send continuous steelmaking stove 9 to smelt qualified molten steel, molten steel is through preliminary laggard refining furnace 12 refinings of alloying, refined molten steel is rolled into qualified steel 16 by steel rolling equipment 15 after being heated by traditional continuous caster 13 strands, heater for rolling steel 14.
The oxygen that mill coal is produced through coal powder injection tower 8 and oxygen generating plant 10 sprays into continuous steelmaking stove 9 with coaloust-oxygen gun, the coal gas (1450～1550 ℃) that continuous steelmaking stove 9 produces is produced the coal gas of high temperature of 800～850 ℃ of temperature for rotary hearth furnace through coal gas upgrading equipment 11, or/and heater for rolling steel, the high temperature of coal gas has obtained utilizing the most efficiently.Low-pressure steam or water at low temperature that factory produces are used for the coal gas upgrading, and low-quality heat energy is utilized effectively;
The high-temp waste gas that heater for rolling steel 14 application self tail cigarette is 700 ℃～900 ℃ adds warm air to 400～500 ℃ high temperature upgrading coal gas (800～850 ℃) the burning heating continuous casting steel billet that supplies heater for rolling steel 14 and coal gas upgrading equipment 11 to send here through process furnace air preheater 17, supplies steel rolling equipment 15 to produce steel 16.200～260 ℃ of waste gas that process furnace air preheater 17 is discharged are by chimney 18 dischargings, and the high-temp waste gas heat is fully used.
Iron content dedusting ash that factory produces and steel rolling iron scale return stock yard 1 and utilize, and slag send cement mill 21 to make cement through slag processing 20 and other dust together, and solid waste is fully used.
These factory's ton steel comprehensively consume mark coal 585Kg mark coal, be lower than the index of the average ton of present long flow process iron and steel technology material 620Kg mark coal, also be lower than the index of smelting reduction process 900Kg such as COREX, FINEX, AUSIRON, HISMELT, DIOS, ROMELT, CCF, AISI, CLEANMELT.HISMELT technology has been developed maturation, and ton iron comprehensively consumes mark coal 750Kg.
Embodiment 2:
Raw material: ferrous material comprises: powdered iron ore, iron content dedusting ash, iron scale; Carbonaceous material is selected from coal dust; Other raw materials comprise lime, fluorite, rhombspar.
The equipment of factory of the present invention comprises: stock yard 1, ball mill 2, batch bin 3, balling equipment 4, shaft furnace 5, rotary hearth furnace 6, oxygen-rich air preheater 7, coal powder injection tower 8, continuous steelmaking stove 9, oxygen generating plant 10, coal gas upgrading equipment 11, refining furnace 12, casting integration apparatus 22, steel 16, chimney 18, dust removal installation 19, slag processing 20, cement mill 21.As shown in Figure 2.Ball mill 2, balling equipment 4, shaft furnace 5, rotary hearth furnace 6, continuous steelmaking stove 9, refining furnace 12 and casting integration apparatus 22 link to each other successively, coal powder injection tower 8 links to each other with continuous steelmaking stove 9, be used for providing the mill coal coal dust to continuous steelmaking stove 9, oxygen generating plant 10 links to each other with continuous steelmaking stove 9, is used for providing oxygen to continuous steelmaking stove 9; Coal gas upgrading equipment 11 is used for the coal gas that continuous steelmaking stove 9 produces is carried out modification; The modification coal gas that coal gas upgrading equipment 11 produces is transported to rotary hearth furnace 6; Dust removal installation 19 links to each other with rotary hearth furnace 6, is used for the waste gas that rotary hearth furnace 6 produces is carried out dedusting.Also comprise apparatus for treating steel slags 20, apparatus for treating steel slags 20 links to each other with continuous steelmaking stove 9, is used to handle the slag that continuous steelmaking stove 9 produces.
The flue dust that dust removal installation produces is discharged through chimney 18.
Preheating palletizing shaft furnace 5, can with chain comb formula preheating oven or other more efficiently the pelletizing preliminary heating device replace.
Stock yard 1 powdered iron ore or/and ferrous materials such as iron dust containing, iron scale through ball mill 2 fine grindings delivery feed bin 3 after require granularity, green-ball through balling equipment 4 outputs send shaft furnace 5 to carry out preheating, send rotary hearth furnace 6 prereduction then, metallized pellet after the prereduction send continuous steelmaking stove 9 to smelt qualified molten steel, molten steel is through preliminary laggard refining furnace 12 refinings of alloying, and refined molten steel goes out steel 16 by casting integration apparatus 22 direct production.
The oxygen that mill coal is produced through coal powder injection tower 8 and oxygen generating plant 10 sprays into continuous steelmaking stove 9 with coaloust-oxygen gun, the coal gas (1450～1550 ℃) that continuous steelmaking stove 9 produces is produced the coal gas of high temperature of 800～850 ℃ of temperature for rotary hearth furnace through coal gas upgrading equipment 11, the high temperature of coal gas has obtained utilizing the most efficiently.Low-pressure steam or water at low temperature that factory produces are used for the coal gas upgrading, and low-quality heat energy is utilized effectively;
Iron content dedusting ash that factory produces and steel rolling iron scale return stock yard 1 and utilize, and slag send cement mill 21 to make cement through slag processing 20 and other dust together, and solid waste is fully used.
This factory's ton steel comprehensively consumes mark coal 551Kg, is minimum, the minimum emissions of comprehensive energy consumption in the present known Steel Plant, the steel technological process of production that production cost is minimum.
Embodiment 3:
Raw material: ferrous material comprises: powdered iron ore, iron content dedusting ash, iron scale; Carbonaceous material is selected from Sweet natural gas; Other raw materials comprise lime, fluorite, rhombspar.
The equipment of factory of the present invention comprises: stock yard 1, ball mill 2, batch bin 3, balling equipment 4, shaft furnace 5, rotary hearth furnace 6, oxygen-rich air preheater 7, continuous steelmaking stove 9, oxygen generating plant 10, coal gas upgrading equipment 11, refining furnace 12, casting integration apparatus 22, steel 16, chimney 18, dust removal installation 19, slag processing 20, cement mill 21, combustible gas storage tank 23.As shown in Figure 3.Ball mill 2, balling equipment 4, shaft furnace 5, rotary hearth furnace 6, continuous steelmaking stove 9, refining furnace 12 and casting integration apparatus 22 link to each other successively, combustible gas storage tank 23 links to each other with continuous steelmaking stove 9, be used for providing Sweet natural gas or other inflammable gass to continuous steelmaking stove 9, oxygen generating plant 10 links to each other with continuous steelmaking stove 9, is used for providing oxygen to continuous steelmaking stove 9; Coal gas upgrading equipment 11 is used for the coal gas that continuous steelmaking stove 9 produces is carried out modification; The modification coal gas that coal gas upgrading equipment 11 produces is transported to rotary hearth furnace 6; Dust removal installation 19 links to each other with rotary hearth furnace 6, is used for the waste gas that rotary hearth furnace 6 produces is carried out dedusting.Also comprise apparatus for treating steel slags 20, apparatus for treating steel slags 20 links to each other with continuous steelmaking stove 9, is used to handle the slag that continuous steelmaking stove 9 produces.
The flue dust that dust removal installation produces is discharged through chimney 18.
Preheating palletizing shaft furnace 5, can with chain comb formula preheating oven or other more efficiently the pelletizing preliminary heating device replace.Sweet natural gas also can be other inflammable gass such as combustible ice.
Stock yard 1 powdered iron ore or/and ferrous materials such as iron dust containing, iron scale through ball mill 2 fine grindings delivery feed bin 3 after require granularity, green-ball through balling equipment 4 outputs send shaft furnace 5 to carry out preheating, send rotary hearth furnace 6 prereduction then, metallized pellet after the prereduction send continuous steelmaking stove 9 to smelt qualified molten steel, molten steel is through preliminary laggard refining furnace 12 refinings of alloying, and refined molten steel goes out steel 16 by casting integration apparatus 22 direct production.
Oxygen and Sweet natural gas that oxygen generating plant 10 is produced spray into continuous steelmaking stove 9 respectively, the coal gas (1450～1550 ℃) that continuous steelmaking stove 9 produces is produced 800～850 ℃ of temperature through coal gas upgrading equipment 11 high temperature upgrading coal gas and confession rotary hearth furnace after Sweet natural gas mixes.The high temperature of continuous steelmaking stove 9 coal gas has obtained utilizing the most efficiently, and low-pressure steam or water at low temperature that factory produces are used for the coal gas upgrading, and low-quality heat energy is utilized effectively;
Iron content dedusting ash that factory produces and steel rolling iron scale return stock yard 1 and utilize, and slag send cement mill 21 to make cement through slag processing 20 and other dust together, and solid waste is fully used.
This factory's ton steel comprehensively consumes Sweet natural gas 485Nm
3, folding and mark coal 555Kg, this flow process is one of steel production plant that present known equipment is minimum, occupation of land is minimum, investment is minimum, flow process is the shortest, energy consumption is minimum, cost is minimum.
Claims (12)
1. a short-flow rotary hearth furnace continuous steelmaking method that fully utilizes the energy comprises the material ball milling, prepares burden, makes ball, palletizing shaft furnace preheating, rotary hearth furnace prereduction, continuous steelmaking, and liquid steel refining, continuous casting, rolling becoming a useful person, step is as follows:
1) ferrous material is made ball and is processed into pelletizing after ball milling, batching,
2) rotary hearth furnace ℃ is sent in the pelletizing that obtains of step 1) 850～950 ℃ of heating by the exhaust gases to 3500～450 of being discharged by rotary hearth furnace oxygen-rich air preheater in primary heater unit,
3) in rotary hearth furnace, pelletizing heats through 800～850 ℃ of high temperature upgrading gas-fireds, makes the prereduction metallized pellet of 1000～1200 ℃ of degree of metalization 85～95%, tapping temperature, for the continuous steelmaking stove; 1100 ℃～1200 ℃ high-temp waste gas input oxygen-rich air preheater producing of rotary hearth furnace simultaneously is preheated to 600～700 ℃ to oxygen-rich air and uses for rotary hearth furnace combustion high temperature upgrading coal gas in the oxygen-rich air preheater;
4) the prereduction metallized pellet that rotary hearth furnace the is provided continuous steelmaking stove of packing into sprays into carbonaceous material and oxygen and carries out continuous steelmaking; Behind 1450～1550 ℃ of coal gas of high temperature upgradings that the continuous steelmaking stove produces, the high temperature upgrading coal gas that obtains for rotary hearth furnace or/and the heater for rolling steel use;
5) 1580～1680 ℃ of molten steel of C content 0.01～0.40wt%, temperature of making of continuous steelmaking stove, for LF refining furnace or RH refining furnace, the molten steel casting that refining furnace makes becomes steel after preliminary deoxidation, alloying.
2. the short-flow rotary hearth furnace continuous steelmaking method of the comprehensive utilization energy as claimed in claim 1 is characterized in that, pack into the temperature of continuous steelmaking stove of the described prereduction metallized pellet of step 4) is 900～1100 ℃.
3. the short-flow rotary hearth furnace continuous steelmaking method of the comprehensive utilization energy as claimed in claim 1 is characterized in that, described high temperature upgrading coal gas is that 1450～1550 ℃ of coal gas of high temperature that the continuous steelmaking stove produces are flow through the coal dust that suspends in the coal gas upgrading stove, CO
2Produce into CO with the coal dust reaction, absorb heat simultaneously; Water vapor and coal dust reaction generate H
2And CO, absorb heat simultaneously; CO behind the upgrading in the coal gas
2Content is less than 15%, and vapour content is less than 5.0%, 800～850 ℃ of temperature, directly for rotary hearth furnace or/and heater for rolling steel use.
4. the short-flow rotary hearth furnace continuous steelmaking method of the comprehensive utilization energy as claimed in claim 1 is characterized in that, the described pelletizing of step 1) is the round pelletizing of Φ 8～28mm of balling disk (-sc) preparation, or the briquetting of ball press preparation.
5. the short-flow rotary hearth furnace continuous steelmaking method of the comprehensive utilization energy as claimed in claim 1 is characterized in that, the micro mist of the described ferrous material of step 1) ball milling to 50～200 μ m uses for making ball.
6. the short-flow rotary hearth furnace continuous steelmaking method of the comprehensive utilization energy as claimed in claim 1 is characterized in that step 2) described carbonaceous material is selected from mill coal coal dust, Sweet natural gas or combustible ice.
Step 2) stove of continuous steelmaking described in can be controlled coal oxygen ratio by adjusting carbonaceous material straying quatity and oxygen straying quatity.
7. a specific equipment that fully utilizes the short-flow rotary hearth furnace continuous steelmaking of the energy comprises ball mill (2), batch bin (3), balling equipment (4), pelletizing primary heater unit, rotary hearth furnace (6), oxygen-rich air preheater (7), coal powder injection tower (8) or combustible gas storage tank (23), continuous steelmaking stove (9), oxygen generating plant (10), coal gas upgrading equipment (11), refining furnace (12), casting and rolling installation, dust removal installation (19).It is characterized in that, ball mill (2), balling equipment (4), pelletizing primary heater unit, rotary hearth furnace (6), continuous steelmaking stove (9), refining furnace (12) link to each other successively with casting and rolling installation, coal powder injection tower (8) links to each other with continuous steelmaking stove (9), be used for providing the mill coal coal dust to continuous steelmaking stove (9), oxygen generating plant (10) links to each other with continuous steelmaking stove (9), is used for providing oxygen to continuous steelmaking stove (9); Coal gas upgrading equipment (11) is used for the coal gas that continuous steelmaking stove (9) produces is carried out modification; The modification coal gas that coal gas upgrading equipment (11) produces is transported to rotary hearth furnace (6); Dust removal installation (19) links to each other with rotary hearth furnace (6), is used for the waste gas that rotary hearth furnace (6) produces is carried out dedusting.
8. the specific equipment of the short-flow rotary hearth furnace continuous steelmaking of the described comprehensive utilization energy of claim 7 is characterized in that, ball mill (2) links to each other with balling equipment (4) through batch bin (3)
The flue dust that dust removal installation produces is discharged through chimney (18).
9. the specific equipment of the short-flow rotary hearth furnace continuous steelmaking of the described comprehensive utilization energy of claim 7 is characterized in that, above-mentioned pelletizing primary heater unit is shaft furnace (5), or chain comb formula preheating oven.
10. the specific equipment of the short-flow rotary hearth furnace continuous steelmaking of the described comprehensive utilization energy of claim 7 is characterized in that, above-mentioned coal powder injection tower (8) is replaced by combustion gas storage tank (23).
11. the specific equipment of the short-flow rotary hearth furnace continuous steelmaking of the described comprehensive utilization energy of claim 7, it is characterized in that above-mentioned casting and rolling installation mainly is made up of continuous caster (13), heater for rolling steel (14), steel rolling equipment (15), process furnace air preheater (17).
12. the specific equipment of the short-flow rotary hearth furnace continuous steelmaking of the described comprehensive utilization energy of claim 7 is characterized in that, above-mentioned casting and rolling installation is selected from casting integration apparatus (22); Described casting equipment integrating is selected from steel band casting equipment integrating, shaped steel casting equipment integrating or bar casting equipment integrating.
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| CN102062534A (en) * | 2010-06-22 | 2011-05-18 | 四川龙蟒矿冶有限责任公司 | Method and device for heat supply of rotary hearth furnace |
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