CN201381333Y - Iron-bearing material suspension two-stage fast reducing furnace - Google Patents
Iron-bearing material suspension two-stage fast reducing furnace Download PDFInfo
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- CN201381333Y CN201381333Y CN200820233050U CN200820233050U CN201381333Y CN 201381333 Y CN201381333 Y CN 201381333Y CN 200820233050 U CN200820233050 U CN 200820233050U CN 200820233050 U CN200820233050 U CN 200820233050U CN 201381333 Y CN201381333 Y CN 201381333Y
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Abstract
The utility model relates to an iron-bearing material suspension two-stage fast reducing furnace, belonging to the technical field of ferrous metallurgy and gas-solid heat exchange or thermal reaction. The gas and the solid in an injection reducing furnace flow upward in parallel. The gas and the solid are in full contact with each other. The heat transfer coefficient and the mass transfer coefficient are large, so the iron-bearing materials can be reduced fast, the drying speed is fast and the average retention time of the particle materials in the system is greatly shortened. The utility model has the advantages that the thermal efficiency of the system is greatly improved, the heat consumption is decreased to below 1800 kilocalories per kilogram reduced iron-bearing materials, the stability of the system is good, the device arrangement is compact, the occupied area is small, the investment is small, the production capacity is high, the product metallization ratio is high and can be controlled within 85 to 97 percent, and the quality is uniform.
Description
Technical field
The utility model belongs to gentle solid heat exchange of technical field of ferrous metallurgy or thermal response field, relates to a kind of rapid heating, fast restore and isolating ferrous material reducing apparatus of powdery iron-containing material specifically.
Background technology
Since Czech slip-stick artist M.Voel-Jorgensen in 1932 has submitted the patent of whirlwind suspended preheater heating cement raw meal first to, the quality and the output of cement kiln are increased substantially, hear rate obviously descends, and has caused the concern of various countries cement technology investigator and equipment manufacturers.The FIOR company of Venezuela and Austrian VAI engineering company limited develop jointly successful FINMET technology in early 1990s, this technology is to be raw material with the powdered iron ore, with the Sweet natural gas is the fluid bed reduction technology that reductive agent is produced direct-reduced iron, compare with other technologies, FINMET technology has reduced production cost owing to use cheaply breeze to do raw material.At last reduced iron powder is made hot wafering iron (HBI).Australian BHP company in 1996 builds up first at the blue port of western Australia Reed and sits the FINMET processing unit, produces hot wafering iron in February, 1999,2,500,000 tons/year of production capacities.CIRCORED technology (also claiming iron carbide technology) is developed by German LURGI, and nucleus equipment comprises respectively one of circulating fluidized bed (gas flow rate is more than 10 times of common fluidized-bed) and common fluidized-bed, makees reductive agent with coal.Fine iron breeze is participated in reaction at circulating fluidized bed earlier behind waste heat, the products obtained therefrom degree of metalization can reach 80%, and through the subordinate phase reaction, degree of metalization can reach more than 93% again.This technology was produced equipment of direct reduction factory's operation under Te La trinidad and tobago U.S. Niu Ke company of 500,000 tons per year, but more because of going wrong in the production process, can't reach stably manufactured, stopped industrialness production in 1999.CIRCORED technology also by the exploitation of German LURGI, belongs to and utilizes the fluidized bed process (factory site Trinida) of Sweet natural gas for reductive agent.2000 by Cliffs﹠amp; Associvote company (Cliffs, LTV steel company and LURGI manage jointly) takes over, and direct-reduced iron is made hot wafering sell, and calendar year 2001 is sold 130,000 tons, but because of the stopping production of market reason.The CFB system major function of HISMELT is that raw material breeze and rhombspar are carried out preheating, it is temperature required that mixing raw material is preheating to technology after through the pre-heating system of being made up of screw feeder, multistage Venturi meter, cyclone, ciculation fluidized reactor, delivers to the SRV injection system by hot ore deposit lift then.
CN92113333.2 discloses a kind of circulating fluidized bed furnace for pre-reduction of fine iron ore, comprise round barrel shape first, two reduction furnaces and first, two separators, first pre-reducing furnace is connected to second pre-reducing furnace by second circulation tube that is formed with the gas supply opening, second pre-reducing furnace is by being formed with the gas supply opening and the 3rd circulation tube is connected to first cyclonic separator, in/the particulate iron ore is because first, the reducing gas that two pre-reducing furnaces converge and form high-velocity fluidized bed and circulate at this, by first circulation tube first separator and first pre-reducing furnace are interconnected, the funnel and second cyclonic separator are connected on first circulation tube.CN96192253.2, CN97192306.X and 95191907.5 discloses the device of three-stage fluidized bed furnace type of reducing fine iron ore, comprise first single fluidized-bed, dry/preheat fine iron ore at boiling row state, first swirler, collection is clipped in the fine iron ore in first furnace gases, the second single current pool furnace, prereduction is from the fine iron ore of first stove, second swirler, collection is clipped in the fine iron ore in second furnace gases, the 3rd double-fluidized-bed stove, it comprises last respectively reduction coarse particles and medium/fine grain first Reaktionsofen and second Reaktionsofen, the 3rd swirler and the 4th swirler, collection is clipped in from first respectively, fine iron ore particle in the second Reaktionsofen furnace gases.CN95191873.7 discloses the method for the fine iron ore of three stage fluidized bed type reduction apparatuss and reduction wide ranges thereof.This equipment comprises the drying/preheating oven that has the first coupled tornado dust collector that series is arranged, have the elementary pre-reducing furnace of the second coupled cyclone dust removal, coarse grain ore in the whole reducing iron ore under the boiling fluidization, shift the high gas velocity reduction furnace of secondary of the medium/smitham in this ore, whole reduction this medium/smitham simultaneously, form the 3rd tornado dust collector that its fluidizing fluid-bed secondary hangs down inner tornado dust collector in the gas velocity reduction furnace and catches not the fine ore of being caught by inner cyclone dust removal.CN98802717.8 discloses the apparatus and method that a kind of fluidized-bed prepares molten pig, the reducing gas that uses coal to produce is infeeded the second fluidized bed reduction furnace reduction of iron ore, the gas that second fluidized-bed is got rid of is for first fluidized bed reducing fine iron ore, and the gained reduction of iron ore melting gasifier of packing into is produced molten iron.CN99122119.2 discloses a kind of coal hydrogen reduction iron smelting method to carry out in reduction shaft furnace and whole reduced iron liquid furnace.With the ferrous material is raw material, is the energy and reductive agent with the coal.Medium reduction degree is adopted in prereduction, and the degree of metalization of prereduction is 50-80%, and concentration 〉=85% of low post-combustion rate CO+H2+CO2+H2O is adopted in reduction eventually.Make in the whole reduction process, indirect reduction and direct reductive ratio were near theoretical optimal value 7: 3.CN85104511A discloses at one to be had gasifier and is placed in the device of the direct reduction shaft furnace above it, shaft furnace connects vertical tube by one and links to each other with gasifier, the reducing gas of obtaining in the gasifier is directly introduced, even when having height to contain gray scale, also can be accomplished.Above publication exists degree of metalization low because described equipment and technology bonded limits, the energy consumption height, and production efficiency is low, problems such as cost height.
The utility model content
Problem in view of above-mentioned prior art existence, task of the present utility model provides a kind of ferrous material suspended secondary fast reduction stove, be suitable for the reducing process requirement of ferrous material, further reduce fluid impedance losses, improve system thermal efficiency, improve the degree of metalization of ferrous material, the prereduction ferrous material micro mist of degree of metalization 85%～97% (controlled in the scope) is provided for the continuous steelmaking smelting furnace, improve output, reduce investment, reduce production costs.
The utility model is a kind of processing unit by the ferrous material gas suspension restoring system that five-stage whirlwind preheating, two-stage injection reduction, cyclonic separation, one-level whirlwind cool off, generation coal gas (or other reducing gass) operation is formed, gas velocity in the system in each heat transfer tube is 2～10 meter per seconds, thereby reduce the fluid impedance losses of system, and the stalling characteristic of the system of assurance.Ferrous material micro mist mean residence time in system is 300～500 seconds, the waste gas that comes out from two-stage injection reduction device, through behind the cyclone preheater, the useless reducing gas temperature of system outlet is 150～300 ℃, ferrous material after the reduction is after the cooling of one-level CO whirlwind eventually, and temperature can drop to 300～700 ℃, and the CO gas after the preheating simultaneously enters II level injection reduction device, improve thermal reduction efficient, obtained the prereduction ferrous material product of high degree of metalization.
The utility model also provides a kind of suspended reduction stove, comprise: lift technique (1), I level heat transfer tube (2), I level cyclone preheater (3), II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube (6), III level cyclone preheater (7), I level injection reduction stove (8), IV level cyclone preheater (9), IV level heat transfer tube (10), V level cyclone preheater (11), cyclonic separator (12), II level injection reduction stove (13), cooling tube (14), cooling cyclone (15), go out feed bin (16), blower fan (17), fly-ash separator (18), useless reducing gas gathering system (19), oxygen enrichment high temperature air pipe (20), with coal gas generation equipment.
As shown in Figure 1, one side of suspended reduction stove is provided with lift technique (1) and links to each other with I level heat transfer tube (2), and I level cyclone preheater (3) from top to bottom links to each other with II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube, III level cyclone preheater (7), IV level cyclone preheater (9) IV level heat transfer tube (10) successively; I level injection reduction stove (8) top links to each other with the discharge port of III level cyclone preheater (7) and the opening for feed of IV level cyclone preheater (9), and the below links to each other with the air outlet of V level cyclone preheater (11); II level injection reduction stove (13) top links to each other with the air outlet of V level cyclone preheater (11) and the opening for feed of cyclonic separator (12), the below successively with cooling cyclone (15) with go out feed bin (16) and link to each other; Cyclonic separator (12) is gone up and is linked to each other with II level injection reduction stove (13) with the discharge port of IV level cyclone preheater (9), links to each other with cooling cyclone (15) with CO gas cooling pipe (14) down; The useless reducing gas outlet of I level cyclone preheater links to each other with blower fan (17), fly-ash separator (18) and useless reducing gas gathering system (19).Reducing gas generation equipment fires the chamber with the spray that oxygen enrichment high temperature air pipe (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13).
Preferably, described reducing gas generation equipment comprises: high-pressure gas pipe (21), high pressure positive blower (22), gas tank (23), Middle pressure draught fan (24), producer gas generator (25); Producer gas generator (25) fires the chamber through Middle pressure draught fan (24), gas tank (23), high pressure positive blower (22) and high-pressure gas pipe (21) with the spray that oxygen hose (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13) successively.
Preferably, the heat transfer tube cross section of cyclone preheater becomes rectangle or circle, and each heat transfer tube feeding mouth has a bulk material device.
Preferably, the useless reducing gas of the high temperature of suspended reduction stove can reclaim sensible heat with waste heat boiler and generate electricity, or the preheating starting material, or through CO absorption
2After CO gas be used for cooling cyclone.
Advantage of the present utility model is embodied in:
1) the utility model is owing to gas, solid two-phase in the injection reduction stove make progress and stream, gas-solid two-phase full contact, conduct heat, mass transfer coefficient is big, for ferrous material conducts heat and reduction provides sufficient dynamic conditions, make ferrous material be able to fast restore, rate of drying is fast, and material particles mean residence time in system shortens dramatically.
2) from the CO gas of cooling cyclone preheating, enter the injection reduction stove by the bottom and improved reduction efficiency.
3) the heat transfer tube cross section of cyclone preheater becomes rectangle or circle, each heat transfer tube feeding mouth has a bulk material device, so that ferrous material is uniformly dispersed, and can reduce the ferrous material lowering speed, prevent from that ferrous material from may take a shortcut directly to fall into following cyclone preheater.
4) because system's total pressure drop is reduced to 200～260mmH
2O, system thermal efficiency improves greatly, and hear rate is reduced to below 1800 kilocalories of/kilogram reduction ferrous materials.
5) system stability is good, and equipment is settled compact, and floor space is little, and investment cost is few, the throughput height, and resultant metal rate height, controlled in 85～97% scopes, quality is even.
Description of drawings
Fig. 1 is the setting drawing of the suspended reduction furnace apparatus of the utility model embodiment 1.
Fig. 2 is the setting drawing of the suspended reduction furnace apparatus of the utility model embodiment 2.
Embodiment
Following examples are to further specify of the present utility model, but the utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1, the suspended reduction stove, comprise: lift technique (1), I level heat transfer tube (2), I level cyclone preheater (3), II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube (6), III level cyclone preheater (7), I level injection reduction stove (8), IV level cyclone preheater (9), IV level heat transfer tube (10), V level cyclone preheater (11), cyclonic separator (12), II level injection reduction stove (13), cooling tube (14), cooling cyclone (15), go out feed bin (16), blower fan (17), fly-ash separator (18), useless reducing gas gathering system (19), oxygen enrichment high temperature air pipe (20), with coal gas generation equipment.
One side of suspended reduction stove is provided with lift technique (1) and links to each other with I level heat transfer tube (2), and I level cyclone preheater (3) from top to bottom links to each other with II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube, III level cyclone preheater (7), IV level cyclone preheater (9) IV level heat transfer tube (10) successively; I level injection reduction stove (8) top links to each other with the discharge port of III level cyclone preheater (7) and the opening for feed of IV level cyclone preheater (9), and the below links to each other with the air outlet of V level cyclone preheater (11); II level injection reduction stove (13) top links to each other with the air outlet of V level cyclone preheater (11) and the opening for feed of cyclonic separator (12), the below successively with cooling cyclone (15) with go out feed bin (16) and link to each other; Cyclonic separator (12) is gone up and is linked to each other with II level injection reduction stove (13) with the discharge port of IV level cyclone preheater (9), links to each other with cooling cyclone (15) with CO gas cooling pipe (14) down; The useless reducing gas outlet of I level cyclone preheater links to each other with blower fan (17), fly-ash separator (18) and useless reducing gas gathering system (19).Reducing gas generation equipment fires the chamber with the spray that oxygen enrichment high temperature air pipe (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13).
Described reducing gas generation equipment comprises: high-pressure gas pipe (21), high pressure positive blower (22), gas tank (23), Middle pressure draught fan (24), producer gas generator (25); Producer gas generator (25) fires the chamber through Middle pressure draught fan (24), gas tank (23), high pressure positive blower (22) and high-pressure gas pipe (21) with the spray that oxygen hose (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13) successively.
The heat transfer tube cross section of cyclone preheater all becomes rectangle.Each heat transfer tube feeding mouth has a bulk material device.
Ferrous material: iron ore micro mist; Reducing gas: coal gas takes place.
The technical process of ferrous material gas suspension restoring system as shown in Figure 1.Ferrous material, lime size range are that the micro mist material of 1-40 μ m is sent into I level heat transfer tube 2 by lift technique 1, fully carry out heat exchange with high temperature reduction gas from II level cyclone preheater 5 after, enter I level cyclone preheater 3; In I level cyclone preheater 3, the ferrous material particle of suspension is separated from reducing gas and is entered II level heat transfer tube 4 successively, and gas is through blower fan 17, fly-ash separator 18, and useless reducing gas gathering system 19 is collected, and useless reducing gas temperature out is 150～300 ℃; The ferrous material that is preheated enters II level heat transfer tube 4, and ferrous material is further by after the high temperature reduction gas preheating from III level cyclone preheater 7, and flows to into II level cyclone preheater 5; In II level cyclone preheater 5, the ferrous material particle of suspension separates with reducing gas, and reducing gas upwards enters I level heat transfer tube 2, and ferrous material enters III level heat transfer tube 6; Material is by the high temperature reduction gas preheating from IV level cyclone preheater 9 in III level heat transfer tube 6, and ferrous material is reduced part, and gas-solid two-phase then also flows to into III level cyclone preheater 7; The ferrous material particle that suspends in III level cyclone preheater 7 separates with reducing gas, and the ferrous material that is preheated also partial reduction enters in the I level injection reduction stove, and reducing gas then enters II level heat transfer tube 4; Ferrous material in I level injection reduction stove 8 under 600～900 ℃ of temperature by a fast restore, degree of metalization will reach 70～80%, the ferrous material particle is under the effect of high temperature reduction gas and flow to into IV level cyclone preheater 9 and separate, separated ferrous material particle enters IV level heat transfer tube 10, and high temperature reduction gas enters III level heat transfer tube 6; By the high temperature reduction gas heating from cyclonic separator 12, ferrous material will further be reduced ferrous material in IV level heat transfer tube 10, and gas-solid two-phase then also flows to into V level cyclone preheater 11; In V level cyclone preheater 11, after the ferrous material particle of suspension is separated from the gas, enter in the II level injection reduction stove 13, high-temperature gas then enters I level injection reduction stove 8; In II level injection reduction stove 13 under 700～1100 ℃ of temperature by the secondary fast restore, the ferrous material degree of metalization will reach 85～97%, the ferrous material particle that is reduced is under the effect of high temperature reduction gas and flow to into cyclonic separator 12 and separate, separated ferrous material particle enters cooling tube 14, and high temperature reduction gas rises to IV level heat transfer tube 10; Ferrous material is cooled in CO gas cooling pipe 14 after cooling cyclone 15 coolings enter out feed bin 16 with separating, and the ferrous material temperature can drop to 300～700 ℃, as the raw material of continuous steelmaking.And the CO gas that is preheated enters II level injection reduction stove 13 as reductive agent.Coal gas is sent into I level injection reduction stove 8 and II level injection reduction stove 13 successively through Middle pressure draught fan 24, gas tank 23, high pressure positive blower 22 and the high-pressure gas pipe 21 oxygen enrichment high temperature air in oxygen enrichment high temperature air pipe 20 spray combustion chamber takes place in producer gas generator 25.
Embodiment 2:
Ferrous material: iron ore micro mist 80%, iron containing metallurgical dust 20%; Reducing gas: coke-oven gas.
As shown in Figure 2, coke-oven gas is through entering gas tank 23 after preheater 26 preheatings.The coke-oven gas of coke-oven gas preheater 26 has replaced the generation coal gas of producer gas generator 25.The heat transfer tube cross section of cyclone preheater is all circular.Other are with embodiment 1.
Ferrous material: iron ore micro mist 10%～90%, iron containing metallurgical dust 90%～10%; Reducing gas: Sweet natural gas has replaced coke-oven gas among the embodiment 2 with Sweet natural gas.The heat transfer tube cross section of cyclone preheater all becomes rectangle.Other is with embodiment 2.
Claims (3)
1. ferrous material suspended reduction stove, comprise: lift technique (1), I level heat transfer tube (2), I level cyclone preheater (3), II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube (6), III level cyclone preheater (7), I level injection reduction stove (8), IV level cyclone preheater (9), IV level heat transfer tube (10), V level cyclone preheater (11), cyclonic separator (12), II level injection reduction stove (13), cooling tube (14), cooling cyclone (15), go out feed bin (16), blower fan (17), fly-ash separator (18), useless reducing gas gathering system (19), oxygen enrichment high temperature air pipe (20), with coal gas generation equipment; It is characterized in that,
One side of suspended reduction stove is provided with lift technique (1) and links to each other with I level heat transfer tube (2), and I level cyclone preheater (3) from top to bottom links to each other with II level heat transfer tube (4), II level cyclone preheater (5), III level heat transfer tube, III level cyclone preheater (7), IV level cyclone preheater (9) IV level heat transfer tube (10) successively; I level injection reduction stove (8) top links to each other with the discharge port of III level cyclone preheater (7) and the opening for feed of IV level cyclone preheater (9), and the below links to each other with the air outlet of V level cyclone preheater (11); II level injection reduction stove (13) top links to each other with the air outlet of V level cyclone preheater (11) and the opening for feed of cyclonic separator (12), the below successively with cooling cyclone (15) with go out feed bin (16) and link to each other; Cyclonic separator (12) is gone up and is linked to each other with II level injection reduction stove (13) with the discharge port of IV level cyclone preheater (9), links to each other with cooling cyclone (15) with CO gas cooling pipe (14) down; The useless reducing gas outlet of I level cyclone preheater links to each other with blower fan (17), fly-ash separator (18) and useless reducing gas gathering system (19).Reducing gas generation equipment fires the chamber with the spray that oxygen enrichment high temperature air pipe (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13).
2. suspended reduction stove as claimed in claim 1 is characterized in that, described reducing gas generation equipment comprises: high-pressure gas pipe (21), high pressure positive blower (22), gas tank (23), Middle pressure draught fan (24), producer gas generator (25); Producer gas generator (25) fires the chamber through Middle pressure draught fan (24), gas tank (23), high pressure positive blower (22) and high-pressure gas pipe (21) with the spray that oxygen hose (20) is connected to I level injection reduction stove (8) and II level injection reduction stove (13) successively.
3. suspended reduction stove as claimed in claim 1 is characterized in that, the heat transfer tube cross section of cyclone preheater becomes rectangle or circle, and each heat transfer tube feeding mouth has a bulk material device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200820233050U CN201381333Y (en) | 2008-12-29 | 2008-12-29 | Iron-bearing material suspension two-stage fast reducing furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200820233050U CN201381333Y (en) | 2008-12-29 | 2008-12-29 | Iron-bearing material suspension two-stage fast reducing furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002546A (en) * | 2010-08-30 | 2011-04-06 | 莱芜钢铁集团有限公司 | Iron-containing material suspending and reducing device and process |
| CN103031433A (en) * | 2011-09-30 | 2013-04-10 | 中国科学院过程工程研究所 | Fluidized oxidation roasting-fluidized reduction roasting system and roasting process for titaniferous iron concentrate |
| CN103031432A (en) * | 2011-09-30 | 2013-04-10 | 中国科学院过程工程研究所 | System for fluidized oxidizing/reducing roasting modification of titaniferous iron concentrate and roasting process |
| CN103060505A (en) * | 2013-01-09 | 2013-04-24 | 莱芜钢铁集团有限公司 | Equipment for directly making steel by using fine ore and coal oxygen |
-
2008
- 2008-12-29 CN CN200820233050U patent/CN201381333Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002546A (en) * | 2010-08-30 | 2011-04-06 | 莱芜钢铁集团有限公司 | Iron-containing material suspending and reducing device and process |
| CN102002546B (en) * | 2010-08-30 | 2012-07-25 | 莱芜钢铁集团有限公司 | Iron-containing material suspending and reducing device and process |
| CN103031433A (en) * | 2011-09-30 | 2013-04-10 | 中国科学院过程工程研究所 | Fluidized oxidation roasting-fluidized reduction roasting system and roasting process for titaniferous iron concentrate |
| CN103031432A (en) * | 2011-09-30 | 2013-04-10 | 中国科学院过程工程研究所 | System for fluidized oxidizing/reducing roasting modification of titaniferous iron concentrate and roasting process |
| CN103031433B (en) * | 2011-09-30 | 2014-07-30 | 中国科学院过程工程研究所 | Fluidized oxidation roasting-fluidized reduction roasting system and roasting process for titaniferous iron concentrate |
| CN103031432B (en) * | 2011-09-30 | 2014-09-24 | 中国科学院过程工程研究所 | System for fluidized oxidizing/reducing roasting modification of titaniferous iron concentrate and roasting process |
| CN103060505A (en) * | 2013-01-09 | 2013-04-24 | 莱芜钢铁集团有限公司 | Equipment for directly making steel by using fine ore and coal oxygen |
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Granted publication date: 20100113 |