CN116516094A - Suspended state direct reduction-side blowing furnace melt-separation low-carbon iron-making method - Google Patents
Suspended state direct reduction-side blowing furnace melt-separation low-carbon iron-making method Download PDFInfo
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- 238000007664 blowing Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 24
- 238000000926 separation method Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 178
- 229910052742 iron Inorganic materials 0.000 claims abstract description 84
- 230000009467 reduction Effects 0.000 claims abstract description 69
- 239000000843 powder Substances 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims abstract description 54
- 239000000725 suspension Substances 0.000 claims abstract description 53
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000001301 oxygen Substances 0.000 claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 25
- 239000000446 fuel Substances 0.000 claims abstract description 15
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 238000001465 metallisation Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 239000003034 coal gas Substances 0.000 claims description 14
- 239000000571 coke Substances 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 8
- 239000004449 solid propellant Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 239000002028 Biomass Substances 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 239000002006 petroleum coke Substances 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 5
- 239000003830 anthracite Substances 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 239000002802 bituminous coal Substances 0.000 claims description 3
- 239000003610 charcoal Substances 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000003077 lignite Substances 0.000 claims description 3
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000002893 slag Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000011343 solid material Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 6
- 238000011946 reduction process Methods 0.000 description 6
- 239000002912 waste gas Substances 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000012256 powdered iron Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000764238 Isis Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000007670 refining Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a suspended direct reduction-side blowing furnace melt-separation low-carbon iron-making method, which relates to the technical field of low-carbon iron-making and comprises the following steps: s1, crushing iron ore and grinding the crushed iron ore into iron ore powder; s2, placing the iron ore powder into a suspension reduction furnace, and introducing high-temperature reducing gas from the bottom of the suspension reduction furnace to directly reduce the iron ore powder in a suspension state, wherein the temperature in the suspension reduction furnace is maintained at 700-900 ℃, and the reduction time is 10-60min, so as to obtain reduced iron powder with a metallization rate of more than 90%; s3, adding reduced iron powder, flux and solid reducing agent into a side-blowing furnace for melting and final reduction, and spraying oxygen-enriched air and fuel into the side-blowing furnace to supply heat to a molten pool; the temperature of the molten pool is maintained at 1450-1600 ℃, the smelting time is 30-90min, and the final reduced iron with the recovery rate of more than 98% is obtained. According to the invention, the powdery iron ore is directly reduced in a suspension state, and then smelting is carried out by adopting a side-blown furnace for smelting, so that final reduction and slag-iron separation are carried out, the preparation process of molten iron is simplified, and meanwhile, energy sources are cooperatively utilized, so that the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of low-carbon iron making, in particular to a suspended direct reduction-side blowing furnace melt-separation low-carbon iron making method.
Background
The iron ore resource reserves of China are rich, and the domestic iron ore concentrate mainly comprises fine iron ore powder.
The traditional iron-making process mainly uses a blast furnace, and is generally used for blast furnace iron-making by sintering or preparing pellets from powdery iron concentrate at home and abroad. Although the blast furnace ironmaking process technology is mature and suitable for large-scale production and takes the dominant role in the ironmaking industry for a long time, the blast furnace ironmaking process flow is long, the investment is large, the energy consumption is high and the environmental pollution is serious, and the blast furnace process flow is further restricted along with the consumption of high-quality metallurgical coke and is strongly dependent on metallurgical coke. If the domestic fine ore can be directly utilized in a way of not sintering agglomeration or pelletizing (pelletizing), the energy consumption can be obviously reduced, the pollution emission can be reduced, the production cost can be saved, and the development of low-carbon ironmaking can be realized. Accordingly, a related art for efficiently utilizing powdery iron ore has yet to be developed.
Application number 200910018443.2 discloses a suspension pre-reduction short-flow continuous steelmaking method, wherein iron-containing materials are processed into iron-containing micro powder through a ball mill, and the iron-containing micro powder is reduced in a suspension pre-reduction furnace to produce metallization rate The pre-reduced metallic iron-containing micropowder is supplied to a continuous steelmaking furnace, and the molten steel produced by the continuous steelmaking furnace is subjected to preliminary alloying and refining to produce qualified molten steel. In the patent, prereduced metallized iron-containing micropowder provided by a suspension prereducing furnace is sprayed into a continuous steelmaking furnace, oxygen and carbon-containing materials are sprayed, continuous steelmaking is realized, and the spraying mode of the oxygen and the carbon-containing materials is not specifically described.
Application number CN201910241072.8 proposes a "method for producing molten iron by direct reduction-arc furnace smelting in a suspended state of powdered iron ore", in which powdered iron ore is placed in a silo; conveying powdery iron ores to a primary cyclone separator through a bin, separating out primary solid materials, and feeding the primary solid materials into the lower part of a suspension heating furnace; high-temperature flue gas is introduced into the bottom of the suspension heating furnace; under the action of negative pressure, the first-stage solid material enters a second-stage cyclone separator, and the separated second-stage solid material enters a reduction reactor; introducing reducing gas into the reduction reactor, and reducing the secondary solid material to generate reduction powder; the reduction powder directly enters an electric furnace; and (3) arc melting is added, and meanwhile, the flux is added into an electric furnace, so that the reduction powder material forms a liquid slag layer and molten iron. In this patent, the reduction powder is fed directly into the electric arc furnace for smelting, which makes the process subject to electric power limitations.
The application number CN201910241058.8 proposes a method for producing molten iron by direct reduction-smelting of powdered iron ore in suspension, which is carried out according to the following steps: (1) placing powdery iron ore into a silo; (2) Conveying the mixture to a first-stage cyclone separator, separating out first-stage solid materials, and feeding the first-stage solid materials into a suspension heating furnace; heating the first-stage solid material by high-temperature flue gas; (3) The negative pressure effect enables the first-stage solid materials to enter a second-stage cyclone separator, and the second-stage solid materials separated out enter a reduction reactor; (4) Introducing reducing gas into the reduction reactor, and reducing the secondary solid material to generate reduction powder; (5) Directly feeding the reduced powder into a multifunctional smelting furnace after discharging; adding flux into a multifunctional smelting furnace, discharging the reduction powder, then feeding the reduction powder into the multifunctional smelting furnace, adding electric arc smelting, spraying fire coal for heating, and heating the reduction powder by the fire coal and carrying out electric arc smelting to form a liquid slag layer and molten iron. In the smelting process, electrode arc heating is adopted, and coal powder combustion is used for heating, and the process is also limited by electric power.
Disclosure of Invention
The invention aims to provide a suspension direct reduction-side blowing furnace melting separation low-carbon iron making method, which is characterized in that powdery iron ore is directly reduced in a suspension state, then side blowing furnace melting separation smelting is adopted to carry out final reduction and slag-iron separation, and the process simplifies the molten iron preparation process, simultaneously cooperatively utilizes energy sources and reduces the production cost.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a suspension direct reduction-side blowing furnace melt-separation low-carbon iron-making method, which comprises the following steps:
s1, crushing iron ore and grinding the crushed iron ore into iron ore powder;
s2, placing iron ore powder into a suspension reduction furnace, and introducing high-temperature reduction gas from the bottom of the suspension reduction furnace to directly reduce the iron ore powder in a suspension state, wherein the temperature in the suspension reduction furnace is maintained at 700-900 ℃ and the reduction time is 10-60min, so as to obtain reduced iron powder with a metallization rate of more than 90%;
s3, adding reduced iron powder, flux and solid reducing agent into a side-blowing furnace for melting and final reduction, and spraying oxygen-enriched air and fuel into the side-blowing furnace to supply heat to a molten pool; the temperature of the molten pool is maintained at 1450-1600 ℃, the smelting time is 30-90min, and the final reduced iron with the recovery rate of more than 98% is obtained.
In one possible embodiment, the method further comprises the steps of:
s4, generating the smelting flue gas produced in the side-blowing furnace into the temperature of gas modification equipmentThe high-temperature modified gas is introduced into a suspension reduction furnace for use.
In one possible embodiment, the part of the iron ore powder with the particle size of less than or equal to 0.074mm accounts for the total mass in the step S1
In one possible embodiment, the high temperature reducing gas in the step S2 is one or more of high temperature upgraded gas, coke oven gas, converter gas, blast furnace gas, natural gas, liquefied gas, shale gas, biomass gas, and hydrogen.
In a possible implementation manner, the step S2 further includes the following steps: oxygen-enriched air is introduced into the suspension reduction furnace and burnt, so that the temperature in the suspension reduction furnace is maintained at 700-900 ℃.
In one possible embodiment, the flux in the step S3 is one or more of quartz sand, quartz stone, limestone and dolomite.
In one possible embodiment, the solid reducing agent in step S3 is one or more of anthracite, bituminous coal, lignite, charcoal, semi-coke, coke and petroleum coke.
In a possible embodiment, the fuel in step S3 is one or more of a gaseous fuel and a solid fuel; wherein,,
the gaseous fuel comprises: natural gas, liquefied petroleum gas, coal gas, biomass gas or hydrogen;
the solid fuel comprises: pulverized coal, pulverized coke or petroleum coke; the solid fuel particle size is less than 100 μm.
In one possible embodiment, the oxygen-enriched air has an oxygen content of 50 to 99.5% by volume.
In one possible embodiment, the high temperature upgraded gas in step S4 comprises CO, H 2 、CO 2 And H 2 O; wherein CO+H 2 The volume concentration of (2) is more than or equal to 70 percent.
The invention has the technical effects and advantages that:
the invention directly utilizes the powder ore, the raw materials do not need to be agglomerated, the reduction of the powder ore particles is realized in high-temperature reducing airflow, and then the final reduction and the slag-iron separation are carried out in a side-blowing furnace. Compared with other iron-making processes, the method has the advantages that the processing cost of the powder ore is lower, the suspended state direct reduction process does not depend on coke, meanwhile, sintering and coking processes can be omitted, the energy consumption is saved, and the environmental pollution is reduced. Compared with lump ore, the particle size of the powder ore is small, the specific surface area is large, and the powder ore particles can be fully contacted with the reducing gas in the suspension state reduction process, so that the mass transfer, heat transfer and reduction process between the particles and the gas are enhanced, and the method has the advantages of high equipment utilization rate, high heat exchange efficiency and the like, and is an environment-friendly iron making process. The final reduction and slag-iron separation are carried out in the side-blown furnace, the fuel combustion flame directly contacts the molten pool, the heat transfer efficiency is improved, and meanwhile, the gas perturbs the molten pool, thereby being beneficial to strengthening the reduction process.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a flow chart of a suspended direct reduction-side blowing furnace melt-down low-carbon iron making method according to an exemplary embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The design concept of the invention comprises: crushing iron ore into iron ore powder; placing iron ore powder into a suspension reduction furnace, introducing high-temperature reduction gas, and directly reducing in a suspension state; adding the reduced iron powder obtained after reduction into a side-blowing furnace, adding a flux and a reducing agent, and melting and final reducing furnace burden in the side-blowing furnace to realize slag-iron separation.
Fig. 1 is a flow chart of a suspended direct reduction-side blowing furnace melt-separation low-carbon ironmaking method according to an exemplary embodiment of the present invention, and as shown in fig. 1, the exemplary embodiment of the present invention provides a suspended direct reduction-side blowing furnace melt-separation low-carbon ironmaking method, which comprises the following specific implementation steps:
s1, crushing iron ore and grinding the crushed iron ore into iron ore powder; the part with the grain diameter less than or equal to 0.074mm in the iron ore powder accounts for the total mass
S2, placing iron ore powder in a suspension reduction furnace, and introducing high-temperature reducing gas from the bottom of the suspension reduction furnace to directly reduce the iron ore powder in a suspension state, wherein the temperature in the suspension reduction furnace is maintained at 700-900 ℃, and the reduction time is 10-60min, so as to obtain reduced iron powder with a metallization rate of more than 90%; waste gas generated by the suspension reduction furnace is discharged after waste heat recovery and dust removal, and iron-containing dust recovered from the waste gas is directly sprayed into the side-blowing furnace.
Besides high-temperature modified gas, coke oven gas, converter gas, blast furnace gas, natural gas, liquefied gas, shale gas, biomass gas, hydrogen and other gases can be introduced into the suspension reduction.
In order to maintain the temperature in the suspension reduction furnace, oxygen-enriched air can be properly introduced into the furnace, and the temperature in the reduction furnace is maintained by burning and releasing heat through combustible gas, wherein the volume content of oxygen in the oxygen-enriched air is 50-99.5%.
S3, adding suspended reduced iron powder, flux and solid reducing agent into a side blowing furnace, injecting oxygen-enriched air and fuel into a transition zone between a slag layer and molten iron in the furnace through multi-channel spray guns at two sides of the side blowing furnace to supply heat to a molten pool, so that materials in the furnace are heated, melted and finally reduced, the temperature of the molten pool is maintained at 1450-1600 ℃, the smelting time is 30-90min, and the recovery rate of the iron after final reduction is realized>98%, and the generated molten iron and slag are discharged from the iron notch and the slag notch at regular intervals; the high temperature modified coal gas of 700-900 ℃ generated by the coal gas modifying equipment is used for the suspension reducing furnace. The components of the high-temperature modified gas comprise CO and H 2 、CO 2 、H 2 O; wherein CO+H 2 The volume concentration of (2) is more than or equal to 70 percent.
Wherein the flux is one or more of quartz sand, quartz stone, limestone and dolomite; the solid reducing agent is one or more of anthracite, bituminous coal, lignite, charcoal, semi-coke, coke and petroleum coke; the fuel comprises one or more of natural gas, liquefied petroleum gas, coal gas, biomass gas, hydrogen and other gas fuels or coal dust, coke powder, petroleum coke and other solid fuels, wherein the granularity of the solid fuel is less than 100 mu m; the volume content of oxygen in the oxygen-enriched air is 50% -99.5%.
S4, generating temperature of smelting flue gas produced in the side-blown converter through gas modifying equipmentDegree ofThe high-temperature modified gas is introduced into a suspension reduction furnace for use.
In the invention, the particle size of the mineral powder in the suspension reduction furnace is small, the reduction dynamics is improved, and the rapid reduction of the iron mineral powder is promoted. The reduced materials are added into a side-blown furnace for final reduction and slag-iron separation, oxygen-enriched air and fuel are blown into a molten pool through a multi-channel spray gun at the side of a hearth, and as the submerged combustion flame directly contacts the molten pool, the heat transfer rate is improved, the rapid melting and reduction smelting of the materials added into the upper part of slag are realized, and the temperature of molten iron can be flexibly controlled by adjusting the blowing amount of the oxygen-enriched air and the fuel. The output temperature in the side blowing furnace isIs high in temperature and contains partial CO due to the high temperature in the gas 2 、H 2 Oxidizing gas such as O and the like is subjected to gas modification, high-temperature smelting gas is in a gas modifying furnace and contacts suspended coal dust, and CO in the gas 2 、H 2 O reacts with coal powder to produce CO and H 2 At the same time, absorbs heat and reduces the temperature of the flue gas; CO+H in the modified coal gas 2 The volume concentration of (2) is more than or equal to 70 percent.
Example 1:
(1) Crushing iron ore and grinding into iron ore powder; the part with the grain diameter less than or equal to 0.074mm in the iron ore powder accounts for the total mass；
(2) Iron ore powder is placed in a suspension reduction furnace, high-temperature modified coal gas with the temperature of 700 ℃ is introduced from the bottom of the suspension reduction furnace, and CO+H in the coal gas 2 The volume concentration of the iron ore powder is more than or equal to 85 percent, oxygen-enriched air (the volume content of oxygen is 95 percent) is introduced into the furnace, the temperature in the furnace in the reduction process is maintained to be 750-800 ℃, the iron ore powder is directly reduced in a suspension state, the reduction time is 60 minutes, and the reduced iron powder with the metallization rate of 90 percent is obtained; waste gas generated by the suspension reduction furnace is discharged after waste heat recovery and dust removal, and iron-containing dust recovered from the waste gas is directly sprayed into the sideBlowing the furnace.
(3) Adding suspended reduced iron powder, limestone and anthracite into a side-blowing furnace, spraying oxygen-enriched gas (the volume content of oxygen is 80%) and natural gas into a transition zone between a slag layer and molten iron in the furnace through multi-channel spray guns at two sides of the side-blowing furnace to supply heat to a molten pool, so that materials in the furnace are heated, melted and finally reduced, the temperature of the molten pool is maintained at 1450 ℃, the smelting time is 90min, the recovery rate of iron after final reduction is more than 98%, and the generated molten iron and slag are discharged from a tap hole and a slag hole periodically;
(4) The smelting flue gas produced in the side blowing furnace generates high-temperature modified coal gas with the temperature of 700 ℃ through coal gas modification equipment for the suspension reduction furnace. CO+H in high temperature modified gas 2 The volume concentration of (2) is more than or equal to 85 percent.
Example 2:
(1) Crushing iron ore and grinding into iron ore powder; the part with the grain diameter less than or equal to 0.074mm in the iron ore powder accounts for the total mass
(2) Iron ore powder is placed in a suspension reducing furnace, high-temperature modified coal gas at 900 ℃ is introduced from the bottom of the suspension reducing furnace, and CO+H in the coal gas 2 Introducing oxygen-enriched air (the volume content of oxygen is 95%) into the furnace, maintaining the temperature in the furnace at 750-800 ℃ in the reduction process, and directly reducing the iron ore powder in a suspension state to ensure that the iron ore powder is directly reduced in the suspension state for 10min, thereby obtaining reduced iron powder with the metallization rate of 90%; waste gas generated by the suspension reduction furnace is discharged after waste heat recovery and dust removal, and iron-containing dust recovered from the waste gas is directly sprayed into the side-blowing furnace.
(3) Adding suspended reduced iron powder, limestone and anthracite into a side-blowing furnace, spraying oxygen-enriched air (the volume content of oxygen is 95%) and natural gas into a transition zone between a slag layer and molten iron in the furnace through multi-channel spray guns at two sides of the side-blowing furnace to supply heat to a molten pool, so that materials in the furnace are heated, melted and finally reduced, the temperature of the molten pool is maintained at 1600 ℃, the smelting time is 30min, the recovery rate of iron after final reduction is more than 98%, and the generated molten iron and slag are discharged from a tap hole and a slag hole periodically;
(4) The smelting flue gas produced in the side blowing furnace generates high-temperature modified coal gas with the temperature of 900 ℃ through coal gas modification equipment for the suspension reduction furnace. CO+H in high temperature modified gas 2 The volume concentration of (2) is more than or equal to 75 percent.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The suspended direct reduction-side blowing furnace melt-separation low-carbon iron-making method is characterized by comprising the following steps of:
s1, crushing iron ore and grinding the crushed iron ore into iron ore powder;
s2, placing iron ore powder into a suspension reduction furnace, and introducing high-temperature reduction gas from the bottom of the suspension reduction furnace to directly reduce the iron ore powder in a suspension state, wherein the temperature in the suspension reduction furnace is maintained at 700-900 ℃ and the reduction time is 10-60min, so as to obtain reduced iron powder with a metallization rate of more than 90%;
s3, adding reduced iron powder, flux and solid reducing agent into a side-blowing furnace for melting and final reduction, and spraying oxygen-enriched air and fuel into the side-blowing furnace to supply heat to a molten pool; the temperature of the molten pool is maintained at 1450-1600 ℃, the smelting time is 30-90min, and the final reduced iron with the recovery rate of more than 98% is obtained.
2. The suspended direct reduction-side blowing furnace melt-down low carbon ironmaking method as claimed in claim 1, further comprising the steps of:
s4, generating the smelting flue gas produced in the side-blowing furnace into the temperature of gas modification equipmentThe high-temperature modified gas is introduced into a suspension reduction furnace for use.
3. The suspended direct reduction-side blowing furnace melt-down low-carbon iron making method according to claim 1 or 2, wherein the iron ore powder with a particle size of 0.074mm or less in the step S1 accounts for the total mass
4. The suspended direct reduction-side blowing furnace melt-down low-carbon ironmaking method according to claim 1 or 2, wherein the high-temperature reducing gas in the step S2 is one or more of high-temperature upgraded gas, coke oven gas, converter gas, blast furnace gas, natural gas, liquefied gas, shale gas, biomass gas and hydrogen.
5. The suspended direct reduction-side blowing furnace melt-down low-carbon ironmaking method according to claim 1, wherein the step S2 further comprises the steps of: oxygen-enriched air is introduced into the suspension reduction furnace and burnt, so that the temperature in the suspension reduction furnace is maintained at 700-900 ℃.
6. The suspended direct reduction-side blowing furnace melting low carbon ironmaking method according to claim 1, wherein the flux in the step S3 is one or more of quartz sand, quartz stone, limestone and dolomite.
7. The suspended direct reduction-side blowing furnace melt-down low-carbon ironmaking method of claim 1, wherein the solid reducing agent in step S3 is one or more of anthracite, bituminous coal, lignite, charcoal, semi-coke, coke and petroleum coke.
8. The suspended direct reduction-side blowing furnace melt-down low-carbon ironmaking method of claim 1, wherein the fuel in step S3 is one or more of a gaseous fuel and a solid fuel; wherein,,
the gaseous fuel comprises: natural gas, liquefied petroleum gas, coal gas, biomass gas or hydrogen;
the solid fuel comprises: pulverized coal, pulverized coke or petroleum coke; the solid fuel particle size is less than 100 μm.
9. The suspended direct reduction-side blowing furnace melting low carbon ironmaking method as claimed in claim 1, characterized in that the oxygen content in the oxygen enriched air is 50-99.5% by volume.
10. The suspended direct reduction-side blowing furnace melting low carbon ironmaking method according to claim 2, wherein the high temperature upgraded gas in step S4 comprises CO, H 2 、CO 2 And H 2 O; wherein CO+H 2 The volume concentration of (2) is more than or equal to 70 percent.
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| CN202310223655.4A CN116516094A (en) | 2023-03-09 | 2023-03-09 | Suspended state direct reduction-side blowing furnace melt-separation low-carbon iron-making method |
| PCT/CN2024/074506 WO2024183501A1 (en) | 2023-03-09 | 2024-01-29 | Low-carbon ironmaking method based on suspended direct reduction-smelting separation in side-blown furnace |
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| CN202310223655.4A CN116516094A (en) | 2023-03-09 | 2023-03-09 | Suspended state direct reduction-side blowing furnace melt-separation low-carbon iron-making method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1014432B (en) * | 1987-12-18 | 1991-10-23 | 日本钢管株式会社 | Method for producing pig iron by smelting reduction of iron ore |
| US5746805A (en) * | 1995-07-18 | 1998-05-05 | Metallgesellschaft Aktiengesellschaft | Process for the continuous manufacture of steel |
| CN1073630C (en) * | 1999-10-27 | 2001-10-24 | 冶金工业部钢铁研究总院 | Coal oxygen fused reduction iron-smelting method and apparatus |
| CN101445848B (en) * | 2008-12-22 | 2010-08-11 | 莱芜钢铁集团有限公司 | Process and device for continuous steelmaking from ferriferous material |
| CN101445851A (en) * | 2008-12-29 | 2009-06-03 | 莱芜钢铁集团有限公司 | Suspended reduction process for iron-containing materials and device therefor |
| CN101748234B (en) * | 2009-09-28 | 2011-12-28 | 莱芜钢铁集团有限公司 | Continuous steel-making method of short process with suspension pre-reduction |
| CN106222349B (en) * | 2016-09-28 | 2018-10-19 | 中国科学院过程工程研究所 | A kind of method and device handling iron-bearing material using bath smelting furnace |
| CN107630139A (en) * | 2017-11-20 | 2018-01-26 | 徐州贝克福尔节能环保技术有限公司 | A kind of iron ore fluidization suspension preheating prereduction device and method |
| CN109929959B (en) * | 2019-03-28 | 2021-03-02 | 东北大学 | Method for producing molten iron by powdery iron ore in suspension state through direct reduction-smelting |
| CN111411185A (en) * | 2020-05-09 | 2020-07-14 | 刘虎才 | Equipment capable of reducing metal and reduction process |
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