CN101397597A - Method for producing spongy iron by direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed - Google Patents
Method for producing spongy iron by direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed Download PDFInfo
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Abstract
The invention discloses a method for reducing and producing sponge iron directly by a dry coal dust gasified hot coal gas fineore fluidized bed, which comprises the following steps of: a) grinding and drying the feed coal; b) spraying the dry coal dust and pure oxygen into a pressured gasification furnace; c) chilling the hot coal gas at the top of a gasification furnace to be 900 DEG C to 950 DEG C by the cooled coal gas of 30 DEG C to 80 DEG C, then removing dust, and after washing and cooling part of the coal gas to be 30 DEG C to 80 DEG C, which then returns to the top of the gasification furnace, chilling the high-temperature coal gas; d) desulfurizing the remaining coal gas which is taken as reducing gas for entering a fluidized bed reactor; and e) introducing the hot coal gas into the last level of the multilevel fluidized bed; and then the coal gas flows in the opposite direction of the iron-containing powder lot; the coal gas flows through all levels of the fluidized bed in the reverse direction and the iron-containing powder lot flows through all levels of the fluidized bed in the forward direction, and then the iron-containing powder lot and the reduced gas countercurrent contact with each other, therefore, the sponge iron is obtained by progressive reduction and carburization. The reduced gas is produced by adopting the technology of gas generation; the energy utilization rate is improved by using the sensible heat of the hot coal gas to provide the energy which is necessary in the hematite reduction; and the generated sponge iron can be used for the electrosmelting of steel directly.
Description
Technical field
The invention belongs to metallurgical ironmaking field, particularly a kind of direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed is produced the method for sponge iron.
Background technology
The industrial production technology of direct-reduced iron can be divided into gas base method and coal-based method two big classes at present.
Gas base method can be divided into shaft kiln directly reduced again and fluidized-bed directly reduces two types.Wherein shaft furnace process is representative with Midrex and HYL technology, and the sponge iron that adopts these two kinds of methods to produce accounts for more than 80% of Gross World Product.The gas-based shaft kiln method has that production technology maturation, equipment are reliable, high (volumetric efficiency reaches 8～10t/m to productivity
3D), the big advantages such as (reaching 1,800,000 t/a) of single furnace output, have very strong competitive power.The shortcoming of shaft furnace process is to use blocky iron-bearing material, and as pelletizing, lump ore or cold bound pellet, powder must just can be gone into stove through after the agglomeration, has increased energy consumption and production cost.The direct reduction technique of fluidized-bed is realized at present the industrialized Finmet technology that has, and can directly utilize fine ore production directly to reduce briquette iron by hot molding (HBI), also is mature technology.
More than two kinds of gas base method process for producing sponge iron all adopt Sweet natural gas to make the reducing gas raw material, it is applied in area that natural gas source lacks and is restricted.Present comparative maturity is without gas making in the coal-based method, directly will directly reduce in pack into behind lump coal, ore and the flux mixing together rotary kiln or the rotary hearth furnace, though these class methods are comparative maturity also, utility factor is low, energy consumption is high, pollutant discharge amount is big, can not use shortcomings such as high sulphur coal and low-ash-fusion coal but exist, be difficult to large-scale promotion, its output only accounts for about 10% of sponge iron ultimate production always.Also having a class in the coal-based method is earlier with gasification, obtains composition and the akin reducing gas of gas base method, removes to produce sponge iron with this reducing gas again.This class sponge iron production technology does not become dominant technology as yet at present, real form industrial application the technical process of COREX-Midrex combination producing sponge iron only arranged, promptly adopt the COREX melting gasification furnace production reducing gas of fixed bed form, connect with the Midrex shaft furnace again and produce sponge iron.
Gasification is a gordian technique of producing clean fuel, synthetic gas and metallurgical reduction gas, extensive, advanced Coal Gasification Technology be applied as alternative oil, Sweet natural gas provides technical solution.The developing direction of a new generation's Coal Gasification Technology is high temperature, high pressure, maximization, high conversion and low emission.Current pressing gas technology mainly is divided three classes: pressurization static bed vapourizing furnace (as pressurization Lurgi stove), pressurized fluidized bed gasifier (Winkler/HTW, KRW, U-gas) and the pressurized air flow bed gasification furnace (Texaco, DOW, Shell, Prenflo, GSP).This three classes gasification technology respectively has characteristics.Compare with fixed bed, fluidized-bed, air flow bed has bigger coal and granularity adaptability, efficiency of carbon conversion height, is more suitable for maximizing, zero release and better technical feature.In entrained flow gasification technology, can be divided into two types of coal water slurry charging (as Texaco and DOW) and dry coal powder chargings (as Shell and GSP etc.) again according to the feeding manner of fine coal, the latter compares with the former technically has following advantage: (1) is lower than the oxygen consumption; (2) effectively pneumatolytic divides high; (3) gasification temperature height; (4) to the raw material restriction still less, there is not the requirement of slurrying; (5) need not standby boiler.More than all these gasification technologies all serving chemical industry and generating, and adopt advanced coal gasifying process production metallurgy product to provide new approach for the coal clean utilization.Therefore the present invention adopts the former process of dry coal powder pressure gasifying technology production reducing gas as combined process flow.
Chinese patent CN1275624A discloses a kind of process for producing sponge iron of the Texaco of employing coal water slurry system gas reduction shaft furnace iron ore, this patent has following characteristics: (1) adopts coal water slurry gas making technology, frequently the oxygen consumption is high mutually with dry coal powder gas making technology, CO+H in the raw gas
2Effective constituent low, use hot wall furnace gas temperature lower than water-cooled fireplace, the anti-material life-span is short, feed coal is had the restriction of slurrying.(2) though can directly utilize fine coal, solved the problem of using lump coal and block coke, shaft furnace still will use blocky pelletizing, lump ore or cold bound pellet, has increased the energy and the raw materials cost of the required consumption of agglomeration.(3) Restore All air cooling but, purify the back reheat and be warming up to 810～1000 ℃ and offer shaft furnace and use, the carbon problem of analysing in heat-processed adopts alternately accumulation of heat type of heating, has increased the loss of nitrogen consumption and coal gas.
Chinese patent CN1167506A discloses a kind of device of producing the method for sponge iron and implementing this method, and this method is raw material production reducing gas in the fixed bed melting gasifier with lump coal and coke, then reducing gas is fed shaft furnace and produces sponge iron.The shortcoming of this method is: (1) can't break away from the dependence to block carbon raw material (lump coal or coke) and block iron oxide-containing materials (pelletizing, lump ore or cold bound pellet).(2) CO+H of fixed bed gasification raw gas
2Effective constituent is lower than 90%, CO
2Content is also than airflow bed gasification furnace height.(3) in order to improve the reducing gas quality, coal gas will be through cooling, purification to remove CO
2(4) cooled coal gas after the purification will reheat 850～1000 ℃ so that the reduction shaft furnace energy needed to be provided, and therefore cooling, reheat process have reduced capacity usage ratio.
Chinese patent CN1207140A discloses a kind of preparation method of sponge iron.This method is raw material production reducing gas in the fixed bed melting gasifier with lump coal and coke, then reducing gas is fed fluidized-bed and directly goes back the original production sponge iron.Though this method can be used the powdered iron oxide-containing materials, and use heating gas directly to reduce, but still can't break away from dependence block carbon raw material (lump coal or coke).In addition, because the inferior quality of this method reducing gas, the sponge iron of production is of low quality, and sponge iron is fused into molten iron and slag making last must the adding in the melting gasifier, and this has also determined this method can only use the fixed bed gasification mode.
Summary of the invention
The object of the present invention is to provide a kind of direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed to produce the method for sponge iron, overcome the restriction that existing gas base method is subjected to natural gas source, adopt Coal Gasification Technology production high-quality reducing gas efficient, cleaning; Utilized the sensible heat of coal gas of high temperature to provide the powdered iron ore reduction required energy, improved energy utilization rate, avoided the carbon problem of analysing in the reducing gas heat-processed simultaneously, the sponge iron of production can be directly used in Electric furnace steel making, is better than traditional blast furnace and direct reduction iron making flow process.
For achieving the above object, technical scheme of the present invention is,
Direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed is produced the method for sponge iron, and it comprises the steps:
A) feed coal is ground to the 90wt% granularity less than 0.1mm, and coal dust is dried to moisture content below 2% with hot inert gas;
B) dry coal powder and pure oxygen spray in the pressurized-gasification furnace of one or more nozzles, dry coal powder and pure oxygen generation oxidation, 1400～1600 ℃ of gasification temperatures, vapourizing furnace pressure 2.0～2.5Mpa;
C) coal gas of high temperature of top of gasification furnace is through dedusting, the cooled cooled coal gas Quench to 900 of washing～950 ℃; 900～950 ℃ of heating gas return the gasification furnace roof after a part is cooled to 30～80 ℃ through wet scrubber in the heating gas after the dedusting coal gas of high temperature are carried out Quench earlier through overheated cyclone dust removal;
D) except above-mentioned circulation cooled coal gas, remaining heating gas is as the output coal gas of gasification unit, and the heating gas of output removes hydrogen sulfide through the moving-bed high temperature desulfuration agent, makes the H in the coal gas
2S content is lower than 100ppmv, and the heating gas after the desulfurization can be used as reducing gas and directly enters the unitary fluidized-bed reactor of reduction of iron ore;
E) heating gas feeds the last step of multistage fluidized bed, and with the countercurrent flow of iron content powder, fluidized-beds at different levels are crossed in reverse flow successively, and iron content powder each fluidized-bed of forward flowing through successively, iron content powder and reducing gas counter current contact, gradual deoxidizing, carburizing obtain sponge iron;
Further, the sponge iron particle of heat is pressed into briquette iron by hot molding through briquetting press, obtains final available product after the cooling.
Again, 30～80 ℃ cooled coal gas removes H by purification
2S, CO
2And moisture.
Cooled coal gas purification process of the present invention adopts the arbitrary combination of NHD, Selexol, MDEA, Sulfinol, MEA, DEA, solid absorption (molecular sieve, gac) or above-mentioned technology.
In addition, sweetening agent of the present invention is selected iron system, manganese system, calcium system or copper system for use.
Used sweetening agent is got rid of the afterreaction recycling utilization from moving-bed.
Described multistage fluidized bed adopts 2～4 grades of fluidized-beds.
Can be used as high-grade fuel or synthetic gas for other full scale plant use or remove CO from the top gas of the direct reduction unit of fluidized-bed output
2With return the fluidized bed circulation utilization behind the moisture.
Containing the method that iron oxide material is produced sponge iron by powdery carbonaceous material and powdery, is a kind of new technological flow combination of adopting dry coal powder airflow bed gasification and the fine ore fluidized bed direct reduction iron making of heating gas,
Patent of the present invention provides that a kind of to contain iron oxide material (fine ore, pelletizing powder or iron dust containing) with powdery carbonaceous material (coal dust or coke powder) and powdery fully be the process for producing sponge iron and the device of raw material, another characteristics of this flow process be the coal gas of high temperature of vapourizing furnace output not all through overcooling, the process that heats up again, directly feed the fluid bed reduction powdered iron ore.
The present invention is ground to 90% (wt) granularity less than 0.1mm with feed coal, and with hot inert gas coal dust is dried to moisture content below 2%.
Dry coal powder and pure oxygen spray in the pressurized-gasification furnace of one or more nozzles, and its main chemical reactions is as follows.
C+O
2＝CO
2
CO
2+C＝2CO
H
2O+C=H
2The vapourizing furnace that dry coal powder and pure oxygen partial oxidation take place+CO has following characteristics:
1. the gasification temperature height reaches 1400～1600 ℃, and efficiency of carbon conversion reaches more than 98%.
2. vapourizing furnace pressure 2.0～2.5MPa.
3. the oxygen consumption is low, compares with coal water slurry gasification, than oxygen consumption low 15～25%.
4. contain effective gas (CO+H in the coal gas
2) reach more than 90%.
5. body of heater adopts the water wall form, avoids high temperature, slag corrosion and start-stop car to produce the destruction of stress to refractory materials.
The about 1500 ℃ coal gas of high temperature of top of gasification furnace is through dedusting, the cooled cooled coal gas Quench to 900 of washing～950 ℃.900～950 ℃ of heating gas return the gasification furnace roof after a part is cooled to 30～80 ℃ through wet scrubber in the heating gas after the dedusting coal gas of high temperature are carried out Quench earlier through overheated cyclone dust removal.In order further to improve gas quality, 30～80 ℃ cooled coal gas removes H by a series of clean units
2S, CO
2And moisture.The purification process that adopts is a technology well known in the art, can be the arbitrary combination of NHD, Selexol, MDEA, Sulfinol, MEA, DEA, solid absorption (molecular sieve, gac etc.) or above-mentioned technology.
Except above-mentioned circulating gas, remaining heating gas is as the output coal gas of gasification unit.The heating gas of output removes hydrogen sulfide through the moving-bed high temperature desulfuration agent, makes the H2S content in the coal gas be lower than 100ppmv, and the heating gas after the desulfurization can be used as reducing gas and directly enters the unitary fluidized-bed reactor of reduction of iron ore.Sweetening agent can be selected iron system, manganese system, calcium system, copper system etc. for use, and its main desulfurization chemical reaction is exemplified below:
2Fe+3H
2S＝Fe
2S
3+3H
2
Fe
2O
3+3H
2S→Fe
2S
3+3H
2OH
2S+FeO＝FeS+H
2O
CaO+H
2S＝CaS+H
2O
Can be by following reaction regeneration recycle after used sweetening agent is got rid of from moving-bed:
Fe
2S
3.H
2O+O
2→Fe
2O
3.H
2O+3S
Heating gas feeds the last step of multistage fluidized bed (2～4 grades), and with the countercurrent flow of iron content powder, fluidized-beds at different levels are crossed in reverse flow successively, and iron content powder each fluidized-bed of forward flowing through successively.Iron content powder and reducing gas counter current contact, gradual deoxidizing, carburizing obtain sponge iron.Main chemical reactions is as follows:
Fe
2O
3+3H
2＝2FeO+H
2O
Fe
2O
3+3CO＝2FeO+CO
2
FeO+CO＝Fe+CO
2
FeO+H
2＝Fe+H
2O
From the top gas of the direct reduction unit output of fluidized-bed, contain the CO that the CO reducing iron ore is generated
2, CO content and reduction of iron ore degree are relevant in its quantity and the reducing gas, and this part top gas still contains higher calorific value (1600～1800kcal/Nm
3), can be used as high-grade fuel or synthetic gas and use for other full scale plant.
Still contain higher calorific value (1600～1800kcal/Nm
3), can be used as high-grade fuel or synthetic gas and use for other full scale plant.
The sponge iron particle of heat is pressed into briquette iron by hot molding (HBI) through briquetting press, further improves the stability of product and conveying property, obtains final available product after the HBI cooling.
The present invention is that the raw material production sponge iron has following beneficial effect with fine coal and powder iron ore:
1. owing to replace oil, Sweet natural gas to make the reduction source of the gas with the dry coal powder, so the present invention can lack oil, natural gas source, but has the area of abundant and cheap coal to implement.
2. substitute lump coal, the alternative fixed bed gasification production reducing gas of air flow bed with fine coal, overcome of the restriction of lump coal resource the gasification link.
3. adopt fluidized-bed directly to reduce and substitute shaft furnace process production sponge iron, need not use natural lump ore or artificial agglomeration, reduced energy consumption and production cost.
4. adopt the dry coal powder gasification pressurized gasification, the gasification temperature height, the efficiency of carbon conversion height, effectively pneumatolytic divides CO+H
2Can reach more than 90%, than fixedly the height of bed is more than 10%, resource utilization and energy utilization rate effectively improve.
5. use advanced dry coal powder pressure gasifying technology, compare than coal water slurry gasification, the oxygen consumption reduces by 15～25%, and efficiency of carbon conversion improves 3～4%, CO+H
2Effective constituent improve 5～10%.
6. adopt hot cyclone dust removal to add gas cooling, the dust collecting process of part wet scrubbing, treatment facility is simple, and operation has been saved the great number investment of waste heat boiler more simultaneously.
7. vapourizing furnace adopts the water wall form, and generation furnace life can reach more than 10 years, and hot wall stove (as Texaco's stove) will be changed anti-material in stove, working cost height in 2 years.
8. the nozzle of dry coal powder is longer than coal-water slurry nozzle work-ing life, change more than 1 year once, and the latter will change maintenance in 2～4 months, so the dry coal powder can single furnace operating, and coal water slurry must have standby boiler.
9. the heating gas of gasification unit output has utilized the sensible heat of heating gas without the temperature changing process repeatedly of cooling, reheat, has improved energy utilization rate.
10. directly utilize heating gas as reducing gas, avoided the carbon problem of analysing that runs in the reducing gas heat-processed.
11. (10～20atm), throughput increases substantially, and equipment volume can reduce, with the linking also more coupling between the high pressure coal gasification unit to utilize the direct reduction technique of fluidized-bed can produce sponge iron under high pressure more.
12. the finished product are briquette iron by hot molding (HBI), character is more stable, is convenient to long storage and remote transportation.
Description of drawings
Fig. 1 produces the schematic flow sheet of sponge iron technology for direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed of the present invention.
Embodiment
Referring to Fig. 1, direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed of the present invention is produced sponge iron technology, will through be ground to granularity less than 0.1mm, be dried to moisture less than 2% the coal dust burner by dry coal dust gasification furnace 1 in oxygen sprays into stove, give birth to violent gasification reaction in high temperature, elevated pressure, the organism in the coal is converted into CO, H
2, CO
2And H
2O, ash content discharge vapourizing furnace after at high temperature becoming slag.
Because actual gasification reaction temperature is up to 1500～1600 ℃ in the stove, the coal gas of high temperature that gasification produces leaves vapourizing furnace at the gasification furnace roof behind cooled coal gas quenching to 900～950 ℃; 900～950 ℃ heating gas is removed main particulate matter in the coal gas through overheated cyclone 2 dedustings earlier; Part coal gas after the dedusting is further removed the small dust in the coal gas and coal gas is cooled to normal temperature through wet scrubber 3 again;
Cooled coal gas removes H through clean unit 4
2S, CO
2And moisture content; Returning top of gasification furnace after compressed machine 5 pressurizations of coal gas after the purification circulates as quenching coal gas; 900～950 ℃ of coal gas of high temperature of gasification unit output remove hydrogen sulfide through moving-bed high temperature desulfurizing reactor 6, make the H in the coal gas
2S content is lower than 100ppmv;
Reducing gas after the desulfurization enters the bottom one-level 7 of 4 placed in-line fluidized-bed reactors, passes through fluidized-bed reactor 8,9 and 10 then successively.After being dried to free water content and reducing to 0.1～0.2% less than the powdered iron ore of 12mm, at first join in the fluidized-bed reactor 10 at the highest level, under action of gravity from the higher reactor lower reactor 9,8 and 7 of flowing through step by step.Powdered iron ore is become sponge iron by gradual deoxidizing with reducing gas in the countercurrent flow process.Sponge iron process press 12 backs of heat form the finished product in the mode of briquette iron by hot molding.Still contain a large amount of CO+H in the reducing gas of from fluidized-bed reactor 10, discharging
2Effective constituent, these gases are exported as medium calorific value gas after scrubber cooler 11 purifies cooling.
Respectively as following table 1 and table 2, the result of the reducing gas composition of vapourizing furnace gained and the sponge iron product of producing sees Table 4 and table 5 respectively at coal and components of iron ore.Material composition sees Table 1, and the composition of the raw gas (reducing gas) that Dry Feeding Entrain Bed Coal Gasification produces sees Table 3.The coal gas that produces can reach technical indicator as shown in table 4 through dedusting, cooling, desulfurizing and purifying after handling, and this reducing gas can satisfy the requirement of shaft kiln directly reduced production high-quality sponge iron after heating.1 ton of feed coal of dry coal dust gasification furnace gasification, consumption 513m
3Purity is 99.6% oxygen, can produce the reducing gas 1800Nm that meets table 4 standard
3Produce the high-quality sponge iron and be used for steel-making, the output gas of fluidized-bed is used for doing in the factory fuel.
The table 1 vapourizing furnace analysis indexes of coal, %
Table 2 iron ore main component, %
| The iron ore kind | TFe | FeO | SiO 2 | CaO | Al 2O 3 | MgO | P+S |
| Pellet | 65.95 | 0.43 | 2.37 | 2.53 | 0.67 | 0.08 | 0.064 |
The reducing gas composition of table 3 vapourizing furnace output
Reducing gas composition behind table 4 high temperature desulfurizing, %
| Composition | CO | CO 2 | H 2 | H 2O | CH 4 | Ar | N 2 | H 2S | CO+H 2 |
| ％Vol | 64 | 1.5 | 27 | 2 | 0.01 | 0.14 | 4.1 | 0.007 | 91 |
The sponge iron quality that table 5 shaft furnace is produced, %
| Mineral | Total iron | Metallic iron | Degree of metalization | SiO 2 | CaO | Al 2O 3 | C | S |
| Pelletizing | 88 | 82 | 93.2 | 2.9 | 3 | 0.6 | 1.8 | 0.03 |
Claims (8)
1. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed is produced the method for sponge iron, and it comprises the steps:
A) feed coal is ground to the 90wt% granularity less than 0.1mm, and coal dust is dried to moisture content below 2% with hot inert gas;
B) dry coal powder and pure oxygen spray in the pressurized-gasification furnace of one or more nozzles, dry coal powder and pure oxygen generation oxidation, 1400～1600 ℃ of gasification temperatures, vapourizing furnace pressure 2.0～2.5Mpa;
C) coal gas of high temperature of top of gasification furnace is through dedusting, the cooled cooled coal gas Quench to 900 of washing～950 ℃; 900～950 ℃ of heating gas return the gasification furnace roof after a part is cooled to 30～80 ℃ through wet scrubber in the heating gas after the dedusting coal gas of high temperature are carried out Quench earlier through overheated cyclone dust removal;
D) except above-mentioned circulation cooled coal gas, remaining heating gas is as the output coal gas of gasification unit, and the heating gas of output removes hydrogen sulfide through the moving-bed high temperature desulfuration agent, makes in the coal gas
2S content is lower than 100ppmv, and the heating gas after the desulfurization can be used as reducing gas and directly enters the unitary fluidized-bed reactor of reduction of iron ore;
E) heating gas feeds the last step of multistage fluidized bed, and with the countercurrent flow of iron content powder, fluidized-beds at different levels are crossed in reverse flow successively, and iron content powder each fluidized-bed of forward flowing through successively, iron content powder and reducing gas counter current contact, gradual deoxidizing, carburizing obtain sponge iron.
2. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that, the sponge iron particle of heat is pressed into briquette iron by hot molding through briquetting press, obtains final available product after the cooling.
3. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that 30～80 ℃ cooled coal gas removes H by purification
2S, CO
2And moisture.
4. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that described cooled coal gas purification process adopts the arbitrary combination of NHD, Selexol, MDEA, Sulfinol, MEA, DEA, solid absorption (molecular sieve, gac) or above-mentioned technology.
5. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that, sweetening agent is selected iron system, manganese system, calcium system or copper system for use.
6. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that, used sweetening agent is got rid of the afterreaction recycling utilization from moving-bed.
7. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that, described multistage fluidized bed adopts 2～4 grades of fluidized-beds.
8. direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed as claimed in claim 1 is produced the method for sponge iron, it is characterized in that, can be used as high-grade fuel or synthetic gas for other full scale plant use or remove CO from the top gas of the direct reduction unit of fluidized-bed output
2With return the fluidized bed circulation utilization behind the moisture.
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| CN101597663B (en) * | 2009-06-30 | 2011-05-25 | 上海锅炉厂有限公司 | An energy recovery system and method for producing sponge iron by high-pressure pulverized coal gasification |
| CN102703635A (en) * | 2012-07-02 | 2012-10-03 | 昆明理工大学 | Direct reduction ironmaking method by electric furnace |
| CN103667702A (en) * | 2013-05-23 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | Novel technique and system for sending reducing gas prepared by medium/low-rank coal gasification to conveying bed for smelting in cold state |
| CN103667566A (en) * | 2013-05-23 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | Novel method and system for fluidized bed smelting of reducing gas prepared by medium/low-rank coal gasification |
| CN103667703A (en) * | 2013-05-23 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | New technique and system for sending reducing gas prepared by medium/low-rank coal gasification to moving bed for smelting in cold state |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT405187B (en) * | 1994-12-01 | 1999-06-25 | Voest Alpine Ind Anlagen | METHOD FOR THE PRODUCTION OF IRON SPONGE AND SYSTEM FOR IMPLEMENTING THE METHOD |
| AT407053B (en) * | 1997-07-04 | 2000-12-27 | Voest Alpine Ind Anlagen | METHOD AND SYSTEM FOR THE PRODUCTION OF A METAL MELT IN A MELTING-UP CARBURETOR USING FINE COAL |
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