CN102382975A - Reduction roasting system of iron ore - Google Patents
Reduction roasting system of iron ore Download PDFInfo
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- CN102382975A CN102382975A CN2011103376056A CN201110337605A CN102382975A CN 102382975 A CN102382975 A CN 102382975A CN 2011103376056 A CN2011103376056 A CN 2011103376056A CN 201110337605 A CN201110337605 A CN 201110337605A CN 102382975 A CN102382975 A CN 102382975A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 26
- 230000009467 reduction Effects 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 72
- 239000007789 gas Substances 0.000 abstract description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 9
- 239000001301 oxygen Substances 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 229910052595 hematite Inorganic materials 0.000 abstract 1
- 239000011019 hematite Substances 0.000 abstract 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 229910021646 siderite Inorganic materials 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 16
- 238000007599 discharging Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000758 substrate Substances 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
- Y02P10/20—Recycling
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Abstract
The invention provides a reduction roasting system of an iron ore, which comprises a pressurization blower, a positive-pressure hot blast stove, a flash roasting furnace and a cyclone separating barrel, wherein the flash roasting furnace comprises an air inlet, an air and material outlet and a material inlet; the cyclone separating barrel comprises an air and material inlet, an air outlet and a material outlet; an air outlet of the pressurization blower is connected with an air inlet of the positive-pressure hot blast stove; an air outlet of the positive-pressure hot blast stove is connected with the air inlet of the flash roasting furnace; a raw material silo is connected with the material inlet of the flash roasting furnace; and the air and material outlet of the flash roasting furnace is connected with the air and material inlet of the cyclone separating barrel. The reduction roasting system of an oxidized ore, such as hematite, limonite or siderite adopts the positive pressure, so that the air cannot leak into a reduction system, and the reduction roasting system solves the technical problems of quality fluctuation of the roasted ore caused by instable reducing atmosphere composition due to air leakage into the system as well as bad recycling due to high oxygen content in the tail gas.
Description
Technical field
The present invention relates to ores containing metal oxides reducing roasting field, especially, relate to a kind of iron ore reduction roasting system.
Background technology
In China, the iron ore reserves are big and distribution is wide, but belong to poor iron ore more than 90%, have the characteristics of " poor, thin, assorted ", and the sorting difficulty is very big.Often make the Fe of weak magnetic in the prior art through reducing roasting
2O
3Be reduced to and have ferromagnetic Fe
3O
4, obtain iron ore concentrate through low intensity magnetic separation.The negative pressure systems that adopt carry out the fast restore roasting more in the existing flash magnetization roasting reducing roasting system, but in the complicated production system of entire structure, sealing difficulty is big.Because system adopts negative pressure; Cause air to be prone to bleed; For stablizing of CO content in the assurance system, the measure of generally taking is the CO content that improves entering system hot blast, but CO content inequality in the system even so also can occur; And then reduction in flash roaster, occurs owing and cross iuvenescence, can not make Fe
2O
3All be transformed into ferromagnetic Fe
3O
4, have a strong impact on the quality of roasted ore, cause productive rate to reduce.And the air in the system of bleeding makes that also oxygen level is high in the tail gas of this system, is unfavorable for recycling.
Summary of the invention
The object of the invention is to provide a kind of iron ore reduction roasting system, causes that the reducing atmosphere composition is unstable and causes oxygen level height in roasted ore quality fluctuation, the tail gas to be unfavorable for the technical problem of recycle to solve the air system of bleeding.
For realizing above-mentioned purpose, the present invention provides a kind of iron ore reduction roasting system, comprising: pressurization blower, malleation hotblast stove, flash roaster and cyclone separating tube; Flash roaster comprises inlet mouth, give vent to anger material mouth and opening for feed, and cyclone separating tube comprises air inlet material mouth, air outlet and discharge port; The air outlet of pressurization blower links to each other with the inlet mouth of malleation hotblast stove, and the air outlet of malleation hotblast stove links to each other with the inlet mouth of flash roaster; The material mouth of giving vent to anger of flash roaster links to each other with the inlet mouth of cyclone separating tube.
Further, the pressure at place, the air outlet of cyclone separating tube is 0～3000Pa.
Another aspect of the present invention also provides a kind of iron ore reduction roasting system, comprising: pressurization blower, malleation hotblast stove, flash roaster, whirlwind preheating tube and cyclone separating tube; Flash roaster comprises inlet mouth, give vent to anger material mouth and opening for feed, and cyclone separating tube comprises air inlet material mouth, air outlet and discharge port; The air outlet of pressurization blower links to each other with the inlet mouth of malleation hotblast stove, and the air outlet of malleation hotblast stove links to each other with the air inlet material mouth of flash roaster; Whirlwind preheating tube comprises air inlet material mouth, air outlet and discharge port, and the air inlet material mouth of whirlwind preheating tube links to each other with the air outlet of cyclone separating tube, and the discharge port of whirlwind preheating tube links to each other with the opening for feed of flash roaster; The material mouth of giving vent to anger of said flash roaster links to each other with the air inlet material mouth of said cyclone separating tube.
Further, the pressure at place, the air outlet of whirlwind preheating tube is 0～3000Pa.
Further, system also comprises induced draft fan, and induced draft fan comprises inlet mouth and air outlet; The air outlet of whirlwind preheating tube and the said inlet mouth of said induced draft fan link to each other.
Further, system also comprises the fluidized-bed that links to each other with the discharge port of cyclone separating tube, and fluidized-bed links to each other with the air outlet of induced draft fan.
Further, system also comprises former feed bin, and former feed bin links to each other with the air outlet of cyclone separating tube and the air inlet material mouth of whirlwind preheating tube respectively.
Further, whirlwind preheating tube is the N level, wherein, and 6 >=N >=1; The whirlwind preheating tube of N level comprises chopped-off head whirlwind preheating tube, final stage whirlwind preheating tube and is successively set on a plurality of intermediate stage whirlwind preheating tubes between chopped-off head whirlwind preheating tube, the final stage whirlwind preheating tube; Every grade of whirlwind preheating tube also comprises the pipeline of the air outlet of the air inlet material mouth that connects this grade whirlwind preheating tube and next stage whirlwind preheating tube, and the discharge port of this grade whirlwind preheating tube links to each other with the pipeline of this next stage whirlwind preheating tube; The air outlet of the relative first step whirlwind preheating tube in the air inlet material mouth of chopped-off head whirlwind preheating tube and the intermediate stage whirlwind preheating tube links to each other; The air inlet material mouth of final stage whirlwind preheating tube links to each other with the air outlet of cyclone separating tube, and the discharge port of final stage whirlwind preheating tube links to each other with the opening for feed of flash roaster.
Further, system also comprises the former feed bin that is communicated with the pipeline of chopped-off head whirlwind preheating tube.
Further, former feed bin is provided with air valve with the pipeline place of connection of chopped-off head whirlwind preheating tube.
Further, the junction of any two-stage in the whirlwind preheating tube is provided with flap valve, star feeder or screw feeder.
The present invention has following beneficial effect:
Iron ore reduction roasting system provided by the invention adopts positive pressure energy to realize that air can't bleed in the reducing roasting system, has solved the technical problem that causes oxygen level height in roasted ore quality fluctuation, the tail gas to be unfavorable for recycle because of the reducing atmosphere composition is unstable.
System provided by the invention helps improving solid-gas ratio, improves the production capacity of unit volume, reduces gas consumption, and stable operation reaches energy-saving effect, and system's investment is low, and operation and maintenance cost is low.
System provided by the invention adopts the malleation roasting system to avoid air to bleed to cause that oxygen level raises, even gas leakage also has only gas can not influence stablizing of reducing atmosphere composition the flash roaster toward leaking outside from interior, has guaranteed the process stabilizing of system.
After system provided by the invention adopts the malleation roasting system; Opening for feed in the system and discharge port all are in the positive pressure environment; Can be in process of production normal continuous charging and discharging, the air that when the cleaning material stops up material, also can not bleed, even gas leakage also have only gas from interior toward leaking outside; Can not influence the stable of reducing atmosphere composition in the flash roaster, make and produce continous-stable.
Iron ore reduction roasting system overall tightness provided by the invention is good, and oxygen level is less than 0.6% in the feasible tail gas that is generated, and this tail gas can be used for the cooling of high temperature substrate roasting product, helps the recycle of tail gas.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the iron ore reduction roasting system synoptic diagram of the preferred embodiment of the present invention;
Fig. 2 is the iron ore reduction roasting system synoptic diagram of the preferred embodiment of the present invention with whirlwind preheating tube; And
Fig. 3 is the iron ore reduction roasting system synoptic diagram with 4 grades of whirlwind preheating tubes of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As shown in Figure 1, iron ore reduction roasting system provided by the invention comprises pressurization blower 1, malleation hotblast stove 2, flash roaster 3 and the cyclone separating tube 4 that links to each other successively.The present invention is applicable to that mainly difficulties such as ores containing metal oxides, particularly rhombohedral iron ore, limonite or spathic iron ore select ferric oxide ore.The iron ore here has ferromagnetic iron ore for needing through being reduced to, so that the iron ore of follow-up separation.Because reducing atmosphere needs to move with handles material in the total system, thereby this material is fine particle, and particle diameter is 150 orders～200 orders, thereby has dispersiveness preferably.The gas that feeds in the pressurization blower 1 can be the tail gas of air, air and recycle; Gas is after pressurization; In malleation hotblast stove 2, producing CO content with coal gas or other fuel combustions is 2%～5% reducing atmosphere, and this reducing atmosphere gets in flash roaster 3 and material generation reduction reaction from former feed bin 5.The air pressure of input are greater than the pressure drop sum in pipeline in the system and the equipment in 1 pair of malleation hotblast stove of pressurization blower 2, thereby make total system all be in the positive pressure environment.This reducing atmosphere of discharging in the malleation hotblast stove 2 also need detect content and the oxygen level of CO before getting into flash roaster 3, after detecting, do not reach requirement, then needs in this reducing atmosphere atmosphere, to add complementary reducing gass such as coal gas.Detection can be carried out through on malleation hotblast stove 2 and pipeline that flash roaster 3 links to each other, proofing unit being set.
Flash roaster 3 is a cartridge type, and its internal structure is the structure of flash roaster commonly used.The bottom of flash roaster 3 is provided with inlet mouth.The sidewall of flash roaster 3 is provided with opening for feed.The top of flash roaster 3 is provided with the material mouth of giving vent to anger.Material gets into from the opening for feed of flash roaster 3, and with reducing atmosphere generation reduction reaction.After accomplishing, material reaction under the drive of reducing atmosphere, leaves from being arranged at the flash roaster 3 vertical material mouths of giving vent to anger.
In order to realize gas solid separation, native system also comprises cyclone separating tube 4, and the internal structure of cyclone separating tube 4 is identical with conventional cyclone separating tube.The top of cyclone separating tube 4 sets out gas port, and the bottom is provided with discharge port, and upper portion side wall is provided with air inlet material mouth.The material mouth of giving vent to anger of flash roaster 3 links to each other with the air inlet material mouth of cyclone separating tube 4.Roasted ore and reducing atmosphere are after the air inlet material mouth entering of cyclone separating tube 4; Roasted ore leaves from the discharge port of cyclone separating tube 4 under the effect of cf-and gravity; Temperature is higher than 800 ℃ reducing atmosphere then from the air outlet discharge of cyclone separating tube 4, and the pressure at place, the air outlet of cyclone separating tube 4 is 0～3000Pa at this moment.Make flash roaster 3 and cyclone separating tube 4 be in the barotropic field 8.This barotropic field 8 can prevent bleeding to the influence of CO content in the shower roasting Deoxidation Atmosphere in Furnace of production process air.And can also realize locating fast and accurately the gas leakage point in process of production.The actual motion effect is superior to existing negative pressure system.
The roasted ore (magnetite) that after said system is handled, obtains can obtain the high grade iron concentrate of TFe＞60% after low intensity magnetic separation.
For utilizing the heat energy preheating material of reducing atmosphere, iron ore reduction roasting system provided by the invention also comprises whirlwind preheating tube 6.Referring to Fig. 2, the top of whirlwind preheating tube 6 sets out gas port, and relative bottom is provided with discharge port, and air inlet material mouth is set on the upper portion side wall.On the pipeline that connects cyclone separating tube 4 air outlets and whirlwind preheating tube 6 air inlet material mouths, also connected former feed bin 5.The air outlet of cyclone separating tube 4 links to each other with the air inlet material mouth of whirlwind preheating tube 6, therefore, temperature is higher than 800 ℃ reducing atmosphere discharge from the air outlet of cyclone separating tube 4 after and the material that gets into from former feed bin 5 get into together in the whirlwind preheating tube 6 the material preheating.The discharge port of whirlwind preheating tube 6 links to each other with the opening for feed of flash roaster 3, gets in the flash roaster 3 after the material preheating.
The air outlet of whirlwind preheating tube 6 links to each other with induced draft fan 7.Induced draft fan 7 can be taken the reductibility tail gas of discharging from whirlwind preheating tube 6 away.For realizing that total system is a malleation, place, the air outlet pressure of whirlwind preheating tube 6 is 0～1000Pa, the corresponding increase of pressure of cyclone separating tube 4 air outlets.This type positive pressure system can be not limited to iron ore reduction roasting system roasting system provided by the invention, can also apply in all the reducing atmosphere roasting or calcination system.This positive pressure system equipment used is conventional equipment.
The normal method of shrend that adopts is come fast cooling in the prior art, and the heat energy of roasted ore is difficult to recycle after this method but adopt.For making full use of heat energy, the discharge port of cyclone separating tube 4 links to each other with the opening for feed of the fluidized-bed of sealing 9, and induced draft fan 7 outlets also link to each other with the inlet mouth of this fluidized-bed 9 simultaneously, with the heat energy recycle with products obtained therefrom after the roasting.When total system is in the malleation; No air bleeds in this reducing atmosphere; And the reductibility exhaust temperature that self-induced-air machine 7 comes out still can reach 300～350 ℃, and wherein oxygen level is extremely low, and induced draft fan 7 outlet one tunnel links to each other with pressurization blower 1; So that tail gas is used as unstripped gas, make full use of its heat energy and CO.
The normal method of shrend that adopts is come fast cooling in the prior art, and the heat energy of roasted ore is difficult to recycle after this method but adopt.Total system of the present invention is in malleation; No air bleeds in this reducing atmosphere; And the reductibility exhaust temperature that self-induced-air machine 7 comes out still can reach 300～350 ℃; Wherein oxygen level is extremely low, is heat energy and the tail gas that makes full use of roasted ore, the higher roasting material of temperature that the discharge port that the present invention adopts the reducing atmosphere tail gas with respect to the roasted ore lesser temps after the whirlwind preheating to cool off cyclone separating tube 4 is discharged.For making tail gas and roasted ore generation sufficient heat exchange, native system adopts fluidized bed plant.
The discharge port of cyclone separating tube 4 links to each other with the opening for feed of the fluidized-bed of sealing 9, and induced draft fan 7 outlet one tunnel links to each other with the inlet mouth of this fluidized-bed 9.This fluidized-bed 9 so that completely cut off roasted ore and the air of temperature up to 800 ℃, and makes roasted ore only carry out heat exchange with low temperature exhaust gas for what seal.Simultaneously because fluidized-bed 9 is full seal type and is in the malleation that outside air can't bleed, and can prevent that roasted ore is oxidized.This high-temperature roasting mineral aggregate can be cooled to below 500 ℃.
Also be provided with the material mouth of giving vent to anger on the fluidized-bed 9, the mixture of roasting mineral aggregate and gas is from this material mouthful entering cyclonic separator of giving vent to anger, gas, the solid separation.For making full use of heat energy and CO, the gas after the separation returns pressurization blower 1 and carries out recycle once more, or uses it for other workshop sections such as drying, reuses as unstripped gas.
Native system has significantly reduced roasting mineral aggregate temperature on the one hand, has realized the abundant recycle of heat energy on the other hand again, has beneficial technical effects.
In addition; Native system is promptly closed the pipeline that is exported to fluidized-bed one tunnel from induced draft fan 7 when tackling the situation of discontinuous operation, and links to each other with pressurization blower 1 from another road of induced draft fan 7 outlets; So that tail gas is used as unstripped gas, make full use of its heat energy and CO.
For making full use of the heat energy of the reducing atmosphere of discharging from cyclone separating tube 4 air outlets, system provided by the invention is provided with the whirlwind preheating tube 6 that N level (N is >=1 natural number) is connected with each other on the basis of embodiment 2.Referring to Fig. 3, when N level whirlwind preheating tube 6 was set, the mode of connection of pressurization blower 1, malleation hotblast stove 2, flash roaster 3 and cyclone separating tube 4 was identical when using one-level cyclone preheater 6.Preferably, 6 >=N >=1.Each grade whirlwind preheating tube comprises the pipeline that whirlwind preheating tube links to each other with opening for feed with this whirlwind preheating tube.The discharge port of upper level (as three grades) whirlwind preheating tube 6 links to each other with the air inlet material mouth pipeline of next stage (like level Four) whirlwind preheating tube 6.
With 4 grades of whirlwind preheating tubes 6 is example, and the annexation of whirlwind preheating tubes 6 at different levels is described, and structure is as shown in Figure 3.4 grades of whirlwind preheating tubes 6 comprise one-level whirlwind preheating tube 61, secondary whirlwind preheating tube 62, three grades of whirlwind preheating tubes 63 and Category Four cyclone preheating tubes 64.The air outlet of one-level whirlwind preheating tube 61 links to each other with induced draft fan 7.The air outlet of secondary whirlwind preheating tube 62 links to each other with the air inlet material mouth of one-level whirlwind preheating tube 61, and this connecting tube is provided with the opening for feed 66 that links to each other with former feed bin 5.Opening for feed 66 places are provided with air valve; Material gets into the air inlet material mouth of connection one-level whirlwind preheating tube 61 and the pipeline of whirlwind preheating tube 62 air outlets through air valve; Under the drive of the reducing atmosphere of discharging from the air outlet of secondary whirlwind preheating tube 62; Material gets in the one-level whirlwind preheating tube 61, preheating therein.For improving gas solid separation efficient, reducing device height, one-level whirlwind preheating tube 61 used herein can be two or more small-sized whirlwind preheating tubes 6 and composes in parallel.The air outlet of three grades of whirlwind preheating tubes 63 links to each other with the air inlet material mouth of secondary whirlwind preheating tube 62.The discharge port of one-level whirlwind preheating tube 61 is connected with the pipeline that is communicated with three grades of whirlwind preheating tubes 63 and secondary whirlwind preheating tube 62.For the reducing atmosphere that prevents to discharge from three grades of whirlwind preheating tube air outlets gets in the one-level whirlwind preheating tube 61 from anti-filling of the discharge port adverse current of one-level whirlwind preheating tube 61 without secondary whirlwind preheating tube 62, the discharge port of one-level whirlwind preheating tube 61 and this pipeline connection place also need be provided with flap valve and lock wind.Flap valve used herein can also be star feeder or screw feeder.Between the whirlwind preheating tubes at different levels, or Category Four cyclone preheating tube 64 all need be provided with flap valve with flash roaster 3 in the corresponding position of pipeline.Under the drive of the reducing atmosphere of discharging, get into preheatings in the secondary whirlwind preheating tube 62 through the material of one-level whirlwind preheating tube 61 preheatings from the air outlet of three grades of whirlwind preheating tubes 63.
The air outlet of Category Four cyclone preheating tube 64 links to each other with the air inlet material mouth of three grades of whirlwind preheating tubes 63, on the connecting pipe of the two, also has been communicated with the discharge port of secondary whirlwind preheating tube 62.Through the material of secondary whirlwind preheating tube 62 preheatings, under the drive of the reducing atmosphere of discharging, get into preheating in three grades of whirlwind preheating tubes 63 from Category Four cyclone preheating tube 64 air outlets.The air inlet material mouth of Category Four cyclone preheating tube 64 links to each other with the air outlet of cyclone separating tube 4, and the discharge port of three grades of whirlwind preheating tubes 63 is connected with the pipeline that is communicated with the two.The material of three grades of whirlwind preheating tubes of warp, 63 preheatings gets into preheatings in the Category Four cyclone preheating tube 64 under the drive of the reducing atmosphere of discharging from cyclone separating tube 4 air outlets.The discharge port of Category Four cyclone preheating tube 64 is connected with the opening for feed of flash roaster 3.Material through 64 preheatings of Category Four cyclone preheating tube gets into flash roaster 3 roastings.The discharge port of flash roaster 3 is connected with the air inlet material mouth of cyclone separating tube 4.The material that gets into flash roaster 3 can improve the temperature of charge that gets into flash roaster 3 after 6 preheatings of multistage cyclone preheater, accelerated reaction is carried out, and helps flash magnetization roasting.Behind multistage cyclone preheater preheating material, make temperature be reduced to 300～350 ℃ greater than 800 ℃ reducing atmosphere.
For guaranteeing that total system all is in malleation from pressurization blower to whirlwind preheating tube air outlet, prevent owing to increase cyclone preheater 6 progression, cause the pressure-losses to increase and can't keep total system and be in malleation.The pressure that pressurization blower 1 is produced increases progressively with the progression of used cyclone preheater 6 in the system.Concrete when 1 cyclone preheater 6 of use, institute's stress is 4000Pa, and induced draft fan 7 blast inlet place pressure are 3000Pa; When using 4 cyclone preheaters 6, institute's stress is 7000Pa, and induced draft fan 7 blast inlet place pressure are 500Pa; When six cyclone preheaters 6 were used in series connection, institute's stress was 8000Pa, and induced draft fan 7 blast inlet place pressure are 0～100Pa.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an iron ore reduction roasting system is characterized in that, comprising: pressurization blower (1), malleation hotblast stove (2), flash roaster (3) and cyclone separating tube (4);
Said flash roaster (3) comprises inlet mouth, give vent to anger material mouth and opening for feed, and said cyclone separating tube (4) comprises air inlet material mouth, air outlet and discharge port;
The air outlet of said pressurization blower (1) links to each other with the inlet mouth of malleation hotblast stove (2), and the air outlet of malleation hotblast stove (2) links to each other with the inlet mouth of flash roaster (3);
The material mouth of giving vent to anger of said flash roaster (3) links to each other with the inlet mouth of said cyclone separating tube (4).
2. system according to claim 1 is characterized in that, the pressure at the place, air outlet of said cyclone separating tube (4) is 0～3000Pa.
3. an iron ore reduction roasting system is characterized in that, comprising: pressurization blower (1), malleation hotblast stove (2), flash roaster (3), whirlwind preheating tube (6) and cyclone separating tube (4);
Said flash roaster (3) comprises inlet mouth, give vent to anger material mouth and opening for feed, and said cyclone separating tube (4) comprises air inlet material mouth, air outlet and discharge port;
The air outlet of said pressurization blower (1) links to each other with the inlet mouth of malleation hotblast stove (2), and the air outlet of said malleation hotblast stove (2) links to each other with the air inlet material mouth of flash roaster (3);
Said whirlwind preheating tube (6) comprises air inlet material mouth, air outlet and discharge port; The air inlet material mouth of said whirlwind preheating tube (6) links to each other with the air outlet of said cyclone separating tube (4), and the discharge port of said whirlwind preheating tube (6) links to each other with the opening for feed of said flash roaster (3);
The material mouth of giving vent to anger of said flash roaster (3) links to each other with the air inlet material mouth of said cyclone separating tube (4).
4. system according to claim 3 is characterized in that, the pressure at the place, air outlet of said whirlwind preheating tube (6) is 0～3000Pa.
5. system according to claim 3 is characterized in that, said system also comprises induced draft fan (7), and said induced draft fan (7) comprises inlet mouth and air outlet; The air outlet of said whirlwind preheating tube (6) links to each other with the said inlet mouth of said induced draft fan (7).
6. system according to claim 5 is characterized in that, said system also comprises the fluidized-bed (9) that links to each other with the discharge port of said cyclone separating tube (4), and said fluidized-bed (9) links to each other with the said air outlet of said induced draft fan (7).
7. system according to claim 6 is characterized in that, said system also comprises former feed bin (5), and said former feed bin (5) links to each other with the air outlet of said cyclone separating tube (4) and the air inlet material mouth of said whirlwind preheating tube (6) respectively.
8. according to each described system in the claim 3～7, it is characterized in that said whirlwind preheating tube is the N level, wherein, 6 >=N >=1;
The whirlwind preheating tube of said N level comprises chopped-off head whirlwind preheating tube, final stage whirlwind preheating tube and is successively set on a plurality of intermediate stage whirlwind preheating tubes between said chopped-off head whirlwind preheating tube, the final stage whirlwind preheating tube;
Every grade of said whirlwind preheating tube also comprises the pipeline of the air outlet of the air inlet material mouth that connects this grade whirlwind preheating tube and the said whirlwind preheating of next stage tube, and the discharge port of this grade whirlwind preheating tube links to each other with the said pipeline of the said whirlwind preheating of this next stage tube;
The air outlet of the relative first step whirlwind preheating tube in the air inlet material mouth of said chopped-off head whirlwind preheating tube and the said intermediate stage whirlwind preheating tube links to each other;
The air inlet material mouth of said final stage whirlwind preheating tube links to each other with the air outlet of said cyclone separating tube (4), and the discharge port of said final stage whirlwind preheating tube links to each other with the opening for feed of said flash roaster (3).
9. system according to claim 8 is characterized in that, said system also comprises the former feed bin (5) that is communicated with the pipeline of said chopped-off head whirlwind preheating tube.
10. system according to claim 9 is characterized in that, said former feed bin (5) is provided with air valve with the pipeline place of connection of said chopped-off head whirlwind preheating tube.
11. system according to claim 10 is characterized in that, the junction of said two stage cyclone preheating tube (6) is provided with flap valve, star feeder or screw feeder.
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| CN2011103376056A CN102382975B (en) | 2011-10-31 | 2011-10-31 | Reduction roasting system of iron ore |
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| CN2011103376056A CN102382975B (en) | 2011-10-31 | 2011-10-31 | Reduction roasting system of iron ore |
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