CN101787408A - Method for producing direct reduced iron by utilizing sensible heat of raw gas - Google Patents
Method for producing direct reduced iron by utilizing sensible heat of raw gas Download PDFInfo
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- CN101787408A CN101787408A CN201010124542A CN201010124542A CN101787408A CN 101787408 A CN101787408 A CN 101787408A CN 201010124542 A CN201010124542 A CN 201010124542A CN 201010124542 A CN201010124542 A CN 201010124542A CN 101787408 A CN101787408 A CN 101787408A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
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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
Abstract
The invention discloses a method for producing direct reduced iron by utilizing sensible heat of raw gas, which comprise the following steps: introducing the raw gas into a reduction shaft, and performing three-section continuous dedusting on the raw gas, wherein in the first section, the high temperature raw gas is subjected to high temperature dedusting by a dust setting chamber, a baffle plate and a cyclone dust collector, then is delivered to the direct reduction shaft to heat ore-coal pellets, or iron oxide pellets and iron ore, or pellets prepared from iron ore powder and taking a mixture of pulverized coal, a binder and lime powder as a coating layer in the direct reduction shaft to produce the direct reduced iron; in the second section, the raw gas is dedusted by a moving material bed in the reduction shaft; and in the third section, the raw gas is dedusted by a conventional cloth bag or is subjected to composite dedusting by an electric bag. The reducing gas after the dedusting is used as fuel gas, or used for generating power or used as a feed gas for producing chemical products. The utilization rate of the sensible heat of the raw gas is 2 to 3 times higher than that in power generation; the direct reduced iron is produced when the raw gas is dedusted; water resources are saved; pollution is lightened; the economic benefit is improved; and pollution-free production can be realized.
Description
Technical field
The present invention relates to a kind of gasification of coal raw gas heat recovery method, specifically is a kind of gasification of coal sensible heat of raw gas direct heating iron ore briquet or iron ore, iron oxide pellet nodulizing of utilizing, to produce the processing method of direct-reduced iron.The present invention directly sends into high temperature rough gas in the direct reduction shaft furnace, is used for heating the iron ore briquet of direct reduction shaft furnace or iron ore, the iron oxide pellet nodulizing is produced direct-reduced iron.Characteristics of the present invention are to have adopted three sections continuous dedustings in recycling raw gas during contained sensible heat, and first section with dust setting chamber, baffle plate, tornado dust collector high-temperature dust removal, remove in the raw gas than coarse particles; Second section is utilized reduced iron and iron ore briquet or iron ore, the dedusting of iron oxide pellet nodulizing grain bed in reduction shaft furnace; Dedusting in the 3rd section scavenging process after the top gas of reduction shaft furnace cooling.
Background technology
No. 200610012837 patent of invention discloses the method that the self-produced reducing gas of a kind of iron ore briquet is produced direct-reduced iron, and this method is to prepare N before blow-on
2, a kind of or several species of gasses in the coke(oven)gas, gas maked coal, Sweet natural gas, coal-seam gas mixes as starting source of the gas, will start source of the gas and be heated to 1150 ℃, feeds heating iron ore briquet in the reduction shaft furnace, makes the part of coal pyrolysis generation in the pelletizing contain CO, H
2, CH
4Coal pyrolysis gas, part of coal is used for reducing iron ore as reductive agent, produces to contain CO
2And H
2The reduction tail gas of O; The coal pyrolysis gas that produces is discharged reduction shaft furnace with reduction tail gas by furnace roof, through purifying and dedusting, remove tar, sulphur and H
2O, CO
2Etc. becoming reducing gas after the foreign gas.Reducing gas with heating progressively substitutes high startup temperature source of the gas, feed in the reduction shaft furnace until substituting high startup temperature source of the gas fully, heat new iron ore briquet, produce new coal pyrolysis gas and reduction tail gas, in reducing gas direct-reduced iron pit coal pelletizing, in the fine iron breeze, form self-produced reducing gas cyclic production and use.Circulation so repeatedly, the continuous production of realization direct-reduced iron.
No. 2008100553998 patent of invention discloses a kind of method of utilizing red Jiao to add reducing gas in the hot direct reduced iron, is with the reducing gas process furnace in the coke dry quenching furnace replacement iron ore briquet production direct-reduced iron technology, replaces N by reducing gas
2As red Jiao's of cooling heat-transfer medium, reducing gas is cooled off in red Jiao's the process and is absorbed red burnt sensible heat feeding coke dry quenching furnace, is warming up to 650～960 ℃, applies O again in the reducing gas of discharging coke dry quenching furnace
2, make the burning of itself and reducing gas produce heat, reducing gas is heated to 1100～1150 ℃, oxidisability is controlled at＜send into reduction shaft furnace after 20%, for iron ore briquet reduced iron provides heat.This invention can realize CO
2Near zero release, and do not have gas, liquid, solid body waste discharge, can realize cleaner production.
No. 2009100753306 patent of invention discloses the method for utilizing the combustion gas of rubbish system to add reducing gas in the hot direct reduced iron, be to burn the inflammable gas that produces, utilize fuel gas with low heat value high-temp combustion technology recuperative heater, iron-smelting blast furnace hotblast stove to heat to survive in the iron ore briquet Primordial Qi to produce circulation reducing gas in the direct-reduced iron by waste incineration or melting.This method requires the calorific value of thick combustion gas to want 〉=850kcal (3558kj), if when not reaching the calorific value minimum requirements, can add coal, coke, semicoke, moulded coal to improve thick fuel gases calorific value in waste incineration or melting incinerator.For preventing that the burning of waste incineration or melting burning and gas secondary from producing dioxin Ji dioxins materials need be done purifying treatment before fuel gas buring or behind the fuel gas buring.Utilize this technology can when handling domestic waste, produce direct-reduced iron.
At present, the sensible heat recoverying and utilizing method in the gasification of coal raw gas mainly contains: external Texaco gasifying process, Destec coal gasifying process, Shell coal gasifying process, Prenflo coal gasifying process; And the coal gasification of China is as multi-nozzle opposed type coal water slurry gasification technology, Unit of Coal Gasification for Pulverized Coal with Ash technology, two-part coal gasification etc.Sensible heat of raw gas in these technology all reclaims with water vapour and hot water form, and comprising having raw gas chilling technology technology, waste heat boiler to reclaim heat technique, the sensible heat of recovery also mainly is to be used to produce water vapour and generating.
Summary of the invention
The purpose of this invention is to provide a kind of sensible heat that utilizes the high temperature rough gas of gasification of coal and heat iron ore briquet in the direct reduction shaft furnace, to produce the method for direct-reduced iron.
The concrete grammar of realizing the object of the invention is:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier, is transported in the direct reduction shaft furnace that is filled with the iron ore briquet by the bustle pipe that is located at the reduction shaft furnace middle part after first section dedusting of high temperature at 1000～1100 ℃;
C. the raw gas that enters reduction shaft furnace passes from iron ore briquet moving granular bed layer, and through second section dedusting of iron ore briquet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron;
D. after raw gas is passed to sensible heat the iron ore briquet and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas;
F. the iron ore briquet in the reduction shaft furnace adds thermal reduction through raw gas and generates direct-reduced iron, is cooled to below 300 ℃ in the reduction shaft furnace bottom, comes out of the stove after sieving out coal ash and reduced iron through bottom discharge mouth lock hopper is airtight.
The reason that the method that the present invention utilizes sensible heat of raw gas to produce direct-reduced iron can be achieved is: owing to be furnished with coal dust as reductive agent in the iron ore briquet, after making that raw gas after the dedusting is given the iron ore briquet with sensible heat transfer, the dry distillation gas that produces in shaft furnace top retort section with the iron ore briquet, the raw gas that reduces tail gas and have neither part nor lot in reduction reaction are together discharged shaft furnace as top gas from the shaft furnace furnace roof.If the required reduction dosage of the coal dust reductive agent of joining in the iron ore briquet and reduction of iron ore equates, then participate in the H of reduction reaction in the raw gas
2With the heat of CO, with the coal pyrolysis gas CH that has neither part nor lot in reduction reaction in the iron ore briquet
4, H
2, CO etc. heat equate substantially.That is: owing to add and joined coal in the pelletizing, make behind the contained heat of chemical ingredients in the raw gas and the direct-reduced iron that the contained heat of chemical ingredients equates substantially in the top gas.The production direct-reduced iron has just utilized the sensible heat in the gasification of coal raw gas.
It is generally acknowledged, can not directly utilize the high temperature rough gas of gasification to produce direct-reduced iron.The more impossible high temperature sensible heat of raw gas that utilizes is produced direct-reduced iron.Its reason one is because contain hazardous elements S in the raw gas, may be reduced iron and absorb in the reduced iron process; The 2nd, the raw gas oxidisability is higher, can not guarantee the needed suboxide degree of direct-reduced iron; The 3rd, contain a large amount of dust in the raw gas, dust is at high temperature softening cohesiveness, can viscous on pipeline, fly-ash separator and direct-reduced iron equipment, can make pipeline, fly-ash separator and structure deteriorate lose design function, even cause accident such as parking; The 4th, to have height to have low because of the pressure of the different raw gass of coal gasifying process, and raw gas can't pressurize when being lower than the required pressure of direct-reduced iron technology.
Yet the present invention discovers:
Adjust the raw gas temperature, reach direct-reduced iron processing requirement temperature; The H that contains q.s in the raw gas
2Raw gas has certain pressure; Oxidisability is lower than the direct-reduced iron processing requirement; Before direct-reduced iron He in the direct-reduced iron process, remove dust; Raw gas just can be directly used in the production direct-reduced iron.Coal gasifying process such as GSP, Shell, two-part are powdered coal pressuring gasified are through selecting higher coal and the adjusting process parameter of coal ash fusion temperature, and its raw gas just can be directly used in the production direct-reduced iron.
The raw gas temperature of various coal gasifying process is between 800～1500 ℃, by adjusting defeated O
2Amount, water delivery vapor volume and coal-feeding quantity ratio can be adjusted the raw gas temperature, when the raw gas temperature is higher than the direct-reduced iron technological temperature, also can be blended into cooled coal gas and reduces the raw gas temperature, to reach the requirement of direct-reduced iron technological temperature.
H in raw gas
2Content 〉=20% o'clock can effectively prevent in the direct-reduced iron production process fe to H
2The absorption of S, SCO, and can utilize H
2Remove the S in the iron ore briquet.Therefore, needn't worry that S enters in the direct-reduced iron product H in the coal gas
2S, SCO can reclaim after producing the direct-reduced iron cooling and be used again.
The raw gas top hole pressure scope of coal gasifier is 0.5～4.0MPa, can reduce pressure in dust removal process, or establish the pressure loading valve step-down to satisfy the requirement of direct-reduced iron operation pressure.
Solve the dust bonding problem in the raw gas, can select coal ash fusion temperature to be higher than the coal of 200 ℃ of direct-reduced iron technological temperatures, as coal for gasification, to avoid coal ash fusion temperature low, the problem of viscous pipeline, valve and equipment, and utilize iron ore briquet and direct-reduced iron in the reduction shaft furnace, or iron ore, iron oxide pellet nodulizing are being realized the uninterrupted dust separating direct-reduced iron of producing simultaneously continuously of high temperature as the dust separating particle of moving granular bed in the direct reduction shaft furnace.
Utilize sensible heat of raw gas to produce in the method for direct-reduced iron in the present invention, high-temperature dust removal is crucial.In the Baosteel COREX melting reducing process, between melting furnace and reduction shaft furnace, be provided with tornado dust collector, 850 ℃ of dedusting temperature, but effect is as one wishes not to the utmost, because dedusting is not thorough, after dust enters reduction shaft furnace, cause charging binding easily, cause the reduction shaft furnace discharging not smooth, be forced to the blowing out cleaning, influence COREX overall operation efficient.The bonding reason of shaft furnace pre-reduced iron is:
1), from the melting reduction furnace, contains a large amount of ferriferous oxides in the gas dust of output, reduced coal ash fusion temperature, coal gas is 830 ℃ from the temperature in that the melting reduction furnace enters direct reduction furnace, coal gas and dust after entering reduction shaft furnace, gathering and cause bonding under iron ball group and iron oxide pellet nodulizing filteration;
2), the coal gas that from the melting reduction furnace, produces, drop to along pipeline in the melting reduction furnace process at direct-reduced iron, upwards seal in direct reduction shaft furnace, its temperature can reach more than 1000 ℃, surpass the temperature of pre-reduced iron softening temperature and iron oxide pellet nodulizing soft heat point, cause bonding;
3), reduction shaft furnace adopts oxide pellet and block iron ore, about 850 ℃ of its soft heat points are to cause one of the coal gas of playing a reversed role, dust and iron ore agglutinating reason.
The present invention has taked following technical scheme for addressing the above problem:
1), selects the high coal of ash fusion point.Select ash fusion point to be higher than reduced iron temperature coal of 200 ℃ more than 1000～1100 ℃, promptly coal ash fusion temperature is more than 1200～1300 ℃.Because be higher than 200 ℃ of coal ash fusion temperature temperature, can guarantee to avoid coal ash to adhere to blocking pipe, valve, fly-ash separator and reduction shaft furnace generally speaking.Coal ash fusion temperature and coal ash mineralogical composition have direct relation, it is generally acknowledged, contain basic oxide (Fe
2O
3, CaO, MgO, Na
2O, K
2O) mass component is high more, and the melt temperature of coal ash is low more; Contain acidic oxide (AI
2O
3, SiO
2, TiO
2) mass component is high more, the melt temperature of coal ash is high more.AI in the various coals
2O
3Variation in coal ash is bigger, generally between 3～50%, and AI
2O
3All the time play a part to increase coal ash fusion temperature in coal ash, the content in coal ash reaches at 30% o'clock, and coal ash fusion temperature can be up to more than 1300～1500 ℃.
2), the present invention's soft heat point of adopting the iron ore briquet to improve to contain the iron ore raw material.1150 ℃ of iron ore briquet soft heat points exceed 300 ℃ for 850 ℃ than the soft heat point of iron oxide pellet nodulizing, and at this moment, the temperature that raw gas is entered reduction shaft furnace is controlled at 1000～1100 ℃ and can avoids boning.
3), raw gas is through no longer returning shaft furnace behind the reduction shaft furnace, the dust of having avoided containing powdered iron ore enters reduction shaft furnace, has therefore also just avoided the agglutinating generation.
4), increase the granularity of raw material ball nodulizing, increase the space between the pelletizing.The granularity of the iron ore briquet that the present invention adopts is 10～50mm, because the space increases between the pelletizing, the motion and the detention space that make dust enter behind the reduction shaft furnace increase, material bed constantly moves down and carries dust and move down, air-flow moves upward and carries dust and move up, and can not manufacture into obstruction because of dust pile.Simultaneously, change motion and detention space that raw material ball nodulizing shape also can increase dust, as the raw material pelletizing being made oblate sphere or oblate cylinder.
5), send into raw gas oxidisability (H in the reduction shaft furnace
2+ CO)/(H
2+ CO+CO
2+ H
2O) want＜15%.Experiment shows, when using the gas reduction carbon containing iron ore pellets of coal gas oxidisability＞25%, can reoxidize after the reduction of carbon containing iron ore pellets.Because the reduction of iron ore briquet produces a large amount of oxidizing gas CO
2And H
2O after converging in reduction shaft furnace with raw gas, can improve the oxidisability of gas in the reduction shaft furnace, consumes the carbon in the iron ore briquet, can make Fe when serious
3O
4Be oxidized to Fe
2O
3, cause iron ore crystalline lattice to change, cause pelletizing expand, loose, lose necessary pellet strength and efflorescence causes reduction shaft furnace normally not move.For guaranteeing the problems referred to above not occur, should select the low gasifying process of oxidisability in the gasification of coal technology, reduce the oxidisability of raw gas in the input reduction shaft furnace.
6), not desulfurization of raw gas.Also do not have sophisticated 1000～1100 ℃ of raw gas desulfurization technologies at present, desulfurization the raw gas temperature must be reduced to normal temperature desulfurization again.So, the sensible heat in the raw gas just can not be used to smelt direct-reduced iron.The present invention finds that in test the iron ore briquet is produced in the direct-reduced iron process in heating the desulfurization phenomenon, and desulfurization degree reaches 70～80%.This may with the H in the coal
2Relevant, similar to coal hydrogenation pyrolysis desulfurization Technology, approach coke-oven gas and coal copyrolysis sulfur removal technology technology.On coke-oven gas and the coal copyrolysis sulfur removal technology technical spirit coal hydrogenation, the methane pyrolysis technology that the hydropyrolysis of coal and coal methane copyrolysis are combined.Its desulfidation is divided into two portions: the 1. desulfurization in the pelletizing, promptly hydrogen that pyrolysis of coal produces in the pelletizing and reaction of Salmon-Saxl generate H
2Gas such as S and COS is also discharged pelletizing and shaft furnace; 2. the H that generates of the reaction of Salmon-Saxl in hydrogen in the reducing gas and coal and the iron ore concentrate
2S gas is discharged shaft furnace with reduction tail gas.Simultaneously, in raw gas, contain 〉=20% H
2, can suppress in the direct-reduced iron production process fe to H
2The absorption of S, SCO is because H
2% content is higher, can remove the S in iron ore and the coal.
7), electrically trapped tar oil.Air-flow bed coal-gasification technology in the coal gasifying process does not contain coal tar as the raw gas of dried coal powder gasifying process.In the direct reducing process of iron ore briquet, 1 ton of reduced iron of every production uses the 218kg coal to make reductive agent, and the tar content in the coal is about 4%, heavily about 8.72kg, because the diluting effect of raw gas and reduction tail gas has arrived the coal tar content in the top gas and has further reduced, and is about 3.2g/m
3The way one that solves the coal tar problem is to select the coal tar dew-point temperature to purify top gas more than 85 ℃, the 2nd, and adopt electrically trapped tar oil technology to remove tar.
8), adjust the raw gas temperature of input reduction shaft furnace.The best reduction temperature of iron ore briquet is 1000～1100 ℃, and for guaranteeing the temperature in the reduction shaft furnace, the raw gas temperature of input reduction shaft furnace can be brought up to 1100 ℃.The optimum method of adjusting the raw gas temperature is to select raw gas temperature in the coal gasifying process near 1100 ℃ technology, adjusts on this basis.For example at the epimere of Xi'an hot working research institute two stage type gas stove, adjust the temperature out of raw gas with the adjustment injecting coal quantity, the injecting coal quantity that reduces the epimere stove can improve the raw gas temperature out, and the injecting coal quantity that increases the epimere stove can reduce the raw gas temperature out.And for example, the spray oxygen amount that increases the epimere stove can improve the raw gas temperature, reduces spray oxygen amount and can reduce the raw gas temperature.
9), adjust the interior gaseous tension of reduction shaft furnace.The raw gas top hole pressure can be 2.5～8.5MPa according to the needs of different industries.The gaseous tension that processing requirement of the present invention is suitable is that hypertonia might cause overbating of coal, reduces pellet strength, even causes the accident when selecting high volatile coal for use owing to the coal blending of iron ore briquet.Certainly, improve that gaseous tension helps improving output and utilizes coal gasifier raw gas gaseous tension in the reduction shaft furnace, but, should select suitable gaseous tension for the safety and the stable smooth operation of processing unit, generally should be at 0.1～3MPa.
One of feature of the present invention is three sections continuous dedustings of dry method.Compare with the wet dedusting cooling, three sections continuous dedustings of dry method of the present invention can not produce a large amount of Heisui River, just have a small amount of sewage and produce in the top gas removal process.This part of contaminated water can be prepared and produce iron ore briquet binding agent, also can purify the back reuse, is used for gasification of coal as producing water vapour.Therefore can realize sewage zero-discharge.
First section dedusting is elementary dedusting.Can crude particle dust be separated with dust setting chamber, baffle plate, also can use the tornado dust collector dedusting.Because the coal gas of output has certain pressure from coal gasifier, need on tornado dust collector, not add electrical equipment and mechanical power components and parts, avoided the influence of high temperature to electrical equipment and mechanical power components and parts, the fly-ash separator liner is selected resistant to elevated temperatures refractory materials for use, as aluminum oxide is the pyroceramic of raw material, adds lagging material between steel plate and refractory materials, also can add water jacket, to prevent dust-laden coal gas of high temperature high speed rotating, the tornado dust collector wall friction is produced the high temperature injury fly-ash separator.One section dust removal installation can be connected also can be in parallel, as dust setting chamber, baffle plate, tornado dust collector arranged in series, many of tornado dust collector side by side or multitube arrange, also can only use wherein a kind of of dust setting chamber, baffle plate, tornado dust collector.
Second section dedusting is the moving granular bed dedusting.Raw gas after one section dedusting carries the part dust and enters reduction shaft furnace and carry out second section dedusting, when the iron ore briquet in giving direct reduction shaft furnace applies the heat reduced iron, also raw gas has been played cooling and dedusting effect.The tail gas of wherein a part of dust after coal gas and reduction is discharged shaft furnace through furnace roof, enters the gas purification operation and carries out the 3rd section dedusting; Another part dust drops to the cooling section of reduction shaft furnace bottom with direct-reduced iron, do cold gas with the coal gas behind the top gas cooling and purifying, cold gas is sent into reduction shaft furnace from direct reduction shaft furnace bottom, imports the bustle pipe bottom of direct reduction shaft furnace from reduction shaft furnace middle part raw gas and discharges shaft furnace; Direct-reduced iron and part dust are lowered the temperature under the cold gas effect at the reduction shaft furnace hypomere, and constantly drop to discharge port and discharge together, through airtight direct-reduced iron and the dust of sieving out of discharging lock hopper.Top gas emptying after compound the 3rd section dedusting of electricity bag, two sections dust that sieve out and one, three section concentrated recycling of dust that dedusting produces.
Second section dedusting of shaft furnace also comprises the cooling section dedusting, promptly cool off coal gas from shaft furnace bottom input shaft furnace, discharge from raw gas input bustle pipe mouth bottom behind the absorption reduced iron heat, blowback goes out a part of dust, utilize waste heat, cooled coal gas recycle behind the bag-type dust through useless pot cooling.Also can be with the cooling coal gas behind the absorption heat, in the shaft furnace of input shaft furnace raw gas input bustle pipe epimere, be used for the preheating furnace charge, need import shaft furnace bustle pipe epimere at raw gas and add coal gas input bustle pipe.
The 3rd section dedusting is conventional bag-type dust or electricity bag composite dedusting.After preceding two sections dedustings, the top gas temperature of discharging from direct reduction shaft furnace has been reduced to 150～200 ℃, wherein contains H
2S, SOC, H
2O, a small amount of tar and low amounts of dust just can be used for the IGCC generating or be used as material gas production chemical product after need carrying out the 3rd section dedusting and purifying.The purification of the top gas of discharging from the reduction shaft furnace top can be adopted conventional gas purification process, because of top gas contains a large amount of CO, H
2, CO
2, H
2O, H
2S, COS, dust and a small amount of coal tar etc. will be removed purification successively, just can be used for combustion gas or material gas.The stock gas purifying method should be according to technology actual selection different process, can select low-temperature rectisol, ammonia process series desulfurization technology, decarburization technique, and reducing gas purifying method such as pressure swing adsorption process.The S and the CO that reclaim
2Can utilize again.The compressed machine pressurization of coal gas after the purification heats up and sends into the gas turbine combustion generating, and tail gas is again through waste heat boiler recycle-water steam and generating.The dust that reclaims can be used as material of construction and uses.
Two of feature of the present invention, be to compare with cogeneration, heat energy utilization is the transmission of single heat, does not have the cogeneration heat to be converted to steam, steam and is converted to the multiple conversions that kinetic energy, kinetic energy are converted to electric energy, so the sensible heat of raw gas utilising efficiency is higher 2～3 times than generating.
Three of feature of the present invention is to compare with cogeneration, and not only UTILIZATION OF VESIDUAL HEAT IN does not consume carbon, and produces the CO that direct-reduced iron produces
2Can be all in top gas reclaiming clean process with lower cost recovery, can with toxic and harmful H in the raw gas
2S, SOC etc. and the H that produces in the direct-reduced iron generation tail gas
2S, SOC sulfides, and other toxic and harmfuls reclaim together and are used.
Four of feature of the present invention, be that the direct-reduced iron production process does not have waste gas, waste sludge discharge, the less water that produces in the top gas removal process can be used to prepare coal water slurry, also can purify the back and replenish the generating process water, or the production water vapor, spray in the coal gasifier in order to increase the H in the coal gas
2Therefore content can realize cleaner production.
Five of feature of the present invention is that the energy consumption of production direct-reduced iron is low.Because only with sensible heat of raw gas, coal dust reductive agent and a small amount of organic binder bond, make the theoretical energy consumption of reductive agent only be 218kg C/ ton iron, reality only is 220～240kg standard coal/ton iron.
Six of feature of the present invention is because direct-reduced iron is a strong endothermic reaction, and temperature only can be because of thermo-negative reaction constantly reduces in the stove, and furnace temperature can not raise, so reduction shaft furnace will be incubated and reduces heat as far as possible and scatter and disappear.
Seven of feature of the present invention is reduction shaft furnace furnace roof and furnace bottom N
2Do sealing gland.When if gaseous tension surpasses 0.8Mpa in the reduction furnace, sealing gland should change lock hopper up and down into up and down, promptly by lock hopper charging, discharging, uses N
2Gas is made transition gas, guarantees safe production in order to secluding air, prevents security incident.
Eight of feature of the present invention is because utilized coal gasifier raw gas pressure, has cancelled reduction shaft furnace reduction air pump supercharging system, and this a part of electric energy, kinetic energy consumption can all save, and with good conditionsily can also utilize top pressure power generation.
The present invention also can select for use iron oxide pellet nodulizing and iron ore for producing the raw material and the dedusting particle of direct-reduced iron, utilizes sensible heat of raw gas to produce direct-reduced iron, comprises following process:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier, is transported in the direct reduction shaft furnace that is filled with iron oxide pellet nodulizing and iron ore by the bustle pipe that is located at the reduction shaft furnace middle part after first section dedusting of high temperature at 790～900 ℃;
C. the raw gas that enters reduction shaft furnace passes from iron oxide pellet nodulizing and iron ore moving granular bed layer, and through iron oxide pellet nodulizing and second section dedusting of iron ore moving granular bed, raw gas heating and reducing iron oxides pellet and iron ore are to produce direct-reduced iron;
D. after raw gas is passed to sensible heat iron oxide pellet nodulizing and iron ore and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas, or be used for combustion gas, or be used for generating, or be used for the unstripped gas of production chemical product;
F. iron oxide pellet nodulizing and iron ore add thermal reduction generation direct-reduced iron through raw gas in reduction shaft furnace, are cooled to below 300 ℃ in the reduction shaft furnace bottom, add N through bottom discharge mouth lock hopper
2Gas shiled is airtight comes out of the stove after sieving out coal ash and reduced iron.
In the above-mentioned direct-reduced iron production method, the raw gas oxidisability of sending into reduction shaft furnace is controlled at≤and 8%, the coal ash softening temperature is controlled at 〉=and 1000 ℃, other processing parameters and process (comprising raw gas pressure, three sections dedustings, stock gas purification etc.) and iron ore briquet are that the direct-reduced iron technology of raw material is identical.
With iron oxide pellet nodulizing and iron ore serves as when producing the raw material of direct-reduced iron and dedusting particle, also will consume corresponding H in the raw gas when utilizing sensible heat of raw gas
2And CO, consuming rough coal tolerance is 700～1000m
3
It is that the pelletizing that the powdered iron ore of integument is made is direct-reduced iron raw material and dedusting particle that the present invention can also select for use with coal dust, binding agent, lime powder mixture, utilizes sensible heat of raw gas to produce direct-reduced iron, comprises following process:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier is at 900～1300 ℃, after first section dedusting of high temperature, be transported to by the bustle pipe that is located at reduction shaft furnace middle part that to be filled with coal dust, binding agent, lime powder mixture be in the direct reduction shaft furnace of the pelletizing made of the powdered iron ore of integument;
C. the raw gas that enters reduction shaft furnace passes from above-mentioned iron ore pellets moving granular bed layer, and through second section dedusting of above-mentioned iron ore pellets moving granular bed, raw gas heats above-mentioned iron ore pellets, by the coal gas that integument produces iron ore pellets is implemented reduction reaction;
D. after raw gas is passed to sensible heat above-mentioned iron ore pellets and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas, or be used for combustion gas, or be used for generating, or be used for the unstripped gas of production chemical product;
F. the above-mentioned iron ore pellets in the reduction shaft furnace adds thermal reduction generation direct-reduced iron through raw gas, is cooled to below 300 ℃ in the reduction shaft furnace bottom, adds N through bottom discharge mouth lock hopper
2Protection, the airtight reduced iron that sieves out coal ash and have integument, crushing and screening goes out direct-reduced iron.Isolated carbonaceous integument can be used as the raw material of coal gasifier.
In the above-mentioned direct-reduced iron production method, the raw gas oxidisability of sending into reduction shaft furnace is controlled at≤and 8%, the coal ash softening temperature is controlled at 〉=and 1000 ℃, other processing parameters and process (comprising raw gas pressure, three sections dedustings, stock gas purification etc.) and iron ore briquet are that the direct-reduced iron technology of raw material is identical.
With coal dust, binding agent, lime powder mixture is in the aforesaid method of the pellet formation direct-reduced iron made of the powdered iron ore of integument; the raw gas of sending into reduction shaft furnace is because of having the protection that contains the coal protective layer and the desulfurization of Wingdale; oxidisability and other chemical ingredients can not be subjected to condition restriction, and other processing parameter and process (comprising raw gas pressure, three sections dedustings, stock gas purification etc.) and iron ore briquet are that the direct-reduced iron technology of raw material is identical.
Embodiment
Embodiment 1
Raw gas is come out of the stove from coal gasifier, and temperature reaches 1000～1100 ℃, coal ash fusion temperature＞1300 ℃, raw gas oxidisability≤15%, pressure 0.1～4MPa, through first section baffle plate, ceramic tornado dust collector dedusting, the shaft furnace that the iron ore briquet is used for producing direct-reduced iron is equipped with in input; Iron ore briquet granularity is 10～50mm.Raw gas carries out second section dedusting of moving granular bed in reduction shaft furnace, raw gas is together discharged shaft furnace with reduction tail gas, coal pyrolysis gas behind the reduced iron from the shaft furnace top, and this moment, furnace top gas temperature was reduced to 150～200 ℃.Stock gas through compound the 3rd section dedusting of electricity bag, removes H again
2S, SOC, CO
2, H
2Behind the toxic and harmfuls such as O, use as combustion gas or material gas.Direct-reduced iron becomes product.Dust concentrates the back to use the S of recovery, CO as the building materials raw material
2Can be used as industrial chemicals uses.
Embodiment 2
Raw gas is from the coal gasifier output, temperature 〉=1150 ℃, coal ash fusion temperature＞1300 ℃, oxidisability 〉=15%, pressure 0.25～8MPa, through the reducing valve 0.1～4MPa that reduces pressure, being blended into the top gas of reduction shaft furnace after the purification, the raw gas temperature is dropped to 1000～1100 ℃, oxidisability is reduced to≤and 15%, after dust setting chamber, first section dedusting of ceramic tornado dust collector, the shaft furnace that the iron ore briquet is used for producing direct-reduced iron is equipped with in input; Iron ore briquet granularity is 10～50mm.Raw gas carries out second section dedusting of moving granular bed in reduction shaft furnace, the raw gas behind the reduced iron is together discharged shaft furnace with reduction tail gas, coal pyrolysis gas from the shaft furnace top, and this moment, furnace top gas temperature was reduced to 150～200 ℃.Stock gas removes tar, removes H through compound the 3rd section dedusting of electricity bag
2S, SOC, CO
2, H
2Behind the toxic and harmfuls such as O, use as combustion gas or material gas.Direct-reduced iron becomes product.Dust concentrates the back to use the S of recovery, CO as the building materials raw material
2Use as industrial chemicals.
Embodiment 3
Raw gas is from the coal gasifier output, temperature reaches 1000～1100 ℃, coal ash fusion temperature＞1300 ℃, raw gas oxidisability≤15%, pressure 0.25～8MPa, through the reducing valve 0.1～4MPa that reduces pressure, again through first section dust setting chamber, baffle plate dedusting, the shaft furnace that the iron ore briquet is used for producing direct-reduced iron is equipped with in input; Iron ore briquet granularity is 10～50mm.Raw gas carries out second section dedusting of moving granular bed in reduction shaft furnace, raw gas is together discharged shaft furnace with reduction tail gas, coal pyrolysis gas behind the reduced iron from the shaft furnace top, and this moment, furnace top gas temperature was reduced to 150～200 ℃.Stock gas through compound the 3rd section dedusting of electricity bag, removes H again
2S, SOC, CO
2, H
2Behind the toxic and harmfuls such as O, use as material gas or combustion gas.Direct-reduced iron becomes product.Dust concentrates the back to use the S of recovery, CO as the building materials raw material
2Use as industrial chemicals.
Embodiment 4
With iron oxide pellet nodulizing and iron ore is raw material and the dedusting particle of producing direct-reduced iron.From the coal gasifier output, temperature reaches 900 ℃ raw gas, coal ash fusion temperature＞1100 ℃, be blended into and purify the cold top gas in back, temperature is adjusted to 830 ℃, raw gas oxidisability＜8%, pressure 0.25～8MPa, through the reducing valve 0.1～4MPa that reduces pressure, again through after first section dust setting chamber and the tornado dust collector dedusting, the iron oxide pellet nodulizing is equipped with in input, iron ore is the shaft furnace that is used for producing direct-reduced iron of raw material; The granularity of iron oxide pellet nodulizing, iron ore is 10～50mm.Raw gas carries out second section dedusting of moving granular bed in reduction shaft furnace, the raw gas behind the reduced iron is together discharged shaft furnace with reduction tail gas, coal pyrolysis gas from the shaft furnace top, and this moment, furnace top gas temperature was reduced to 200～300 ℃.Stock gas through the 3rd section dedusting of cloth bag, removes H again
2S, SOC, CO
2, H
2Behind the toxic and harmfuls such as O, use as material gas or combustion gas.Direct-reduced iron becomes product.Dust concentrates the back to use as the building materials raw material.The S, the CO that reclaim
2Use as industrial chemicals.
Embodiment 5
Raw gas is output from coal gasifier, temperature reaches 1000～1200 ℃, coal ash fusion temperature＞1300 ℃, raw gas oxidisability 8～25%, pressure 0.1～4MPa, through first section baffle plate, ceramic tornado dust collector dedusting, it is that the pelletizing that the powdered iron ore of integument is made is in direct-reduced iron raw material and the dedusting particulate shaft furnace that input is equipped with coal dust, binding agent, lime powder mixture; The granularity of parcel pelletizing is 30～80mm.Raw gas carries out second section dedusting of moving granular bed in reduction shaft furnace, the raw gas behind the reduced iron is together discharged shaft furnace from the top of shaft furnace with reduction tail gas, coal pyrolysis gas, and this moment, furnace top gas temperature was reduced to 150～200 ℃.Stock gas through compound the 3rd section dedusting of electricity bag, removes H again
2S, SOC, CO
2, H
2Behind the toxic and harmfuls such as O, use as combustion gas or material gas.Direct-reduced iron by destructive distillation charcoal layer parcel becomes product, goes out direct-reduced iron through crushing and screening.Dust concentrates the back to use the S of recovery, CO as the building materials raw material
2Can be used as industrial chemicals uses.
Claims (12)
1. utilize sensible heat of raw gas to produce the method for direct-reduced iron, comprise following process:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier, is transported in the direct reduction shaft furnace that is filled with the iron ore briquet by the bustle pipe that is located at the reduction shaft furnace middle part after first section dedusting of high temperature at 1000～1100 ℃;
C. the raw gas that enters reduction shaft furnace passes from iron ore briquet moving granular bed layer, and through second section dedusting of iron ore briquet moving granular bed, and heating iron ore briquet is to produce direct-reduced iron;
D. after raw gas is passed to sensible heat the iron ore briquet and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas;
F. the iron ore briquet in the reduction shaft furnace adds thermal reduction through raw gas and generates direct-reduced iron, is cooled to below 300 ℃ in the reduction shaft furnace bottom, comes out of the stove after sieving out coal ash and reduced iron through bottom discharge mouth lock hopper is airtight.
2. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 1 is characterized in that described first section dedusting is a kind of, the perhaps several combination dedusting in settling pocket dedusting, baffle plate dedusting, the tornado dust collector dedusting.
3. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 1 is characterized in that sending into the raw gas oxidisability (H of reduction shaft furnace
2+ CO)/(H
2+ CO+CO
2+ H
2O)＜15%.
4. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 1 is characterized in that the granularity of the iron ore briquet that loads in the reduction shaft furnace is 10～50mm.
5. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 1, the cooling that it is characterized in that described direct-reduced iron is to do cold gas with the reducing gas that purifies, by the bottom input of reduction shaft furnace, discharge shaft furnace from reducing gas bustle pipe bottom, middle part.
6. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 1 is characterized in that the reducing gas of output is used for combustion gas, or is used for generating, or is used for the unstripped gas of production chemical product.
7. utilize sensible heat of raw gas to produce the method for direct-reduced iron, comprise following process:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier, is transported in the direct reduction shaft furnace that is filled with iron oxide pellet nodulizing and iron ore by the bustle pipe that is located at the reduction shaft furnace middle part after first section dedusting of high temperature at 790～900 ℃;
C. the raw gas that enters reduction shaft furnace passes from iron oxide pellet nodulizing and iron ore moving granular bed layer, and through iron oxide pellet nodulizing and second section dedusting of iron ore moving granular bed, raw gas heating and reducing iron oxides pellet and iron ore are to produce direct-reduced iron;
D. after raw gas is passed to sensible heat iron oxide pellet nodulizing and iron ore and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas, or be used for combustion gas, or be used for generating, or be used for the unstripped gas of production chemical product;
F. iron oxide pellet nodulizing and iron ore add thermal reduction through raw gas and generate direct-reduced iron in reduction shaft furnace, are cooled to below 300 ℃ in the reduction shaft furnace bottom, come out of the stove after sieving out coal ash and reduced iron through bottom discharge mouth lock hopper is airtight.
8. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 7 is characterized in that described first section dedusting is a kind of, the perhaps several combination dedusting in settling pocket dedusting, baffle plate dedusting, the tornado dust collector dedusting.
9. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 7 is characterized in that sending into the raw gas oxidisability (H of reduction shaft furnace
2+ CO)/(H
2+ CO+CO
2+ H
2O)＜8%.
10. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 7 is characterized in that the iron oxide pellet nodulizing that loads in the reduction shaft furnace and the granularity of iron ore are 10～50mm.
11. utilize sensible heat of raw gas to produce the method for direct-reduced iron, comprise following process:
A. the coal of selecting coal ash fusion temperature to be higher than at least 200 ℃ of direct-reduced iron reduction temperatures is raw material, produces raw gas in coal gasifier;
B. the raw gas temperature of controlling output from coal gasifier is at 1000～1300 ℃, after first section dedusting of high temperature, be transported to by the bustle pipe that is located at reduction shaft furnace middle part that to be filled with coal dust, binding agent, lime powder mixture be in the direct reduction shaft furnace of the pelletizing made of the powdered iron ore of integument;
C. the raw gas that enters reduction shaft furnace passes from above-mentioned iron ore pellets moving granular bed layer, and through second section dedusting of moving granular bed, raw gas heats above-mentioned iron ore pellets, by the dry distillation gas that integument produces iron ore pellets is implemented reduction reaction;
D. after raw gas is passed to sensible heat above-mentioned iron ore pellets and is used for reduced iron, cool to 150～200 ℃, discharge reduction shaft furnace as the reduction shaft furnace top gas;
E. the top gas of Pai Chuing through the 3rd section electricity bag composite dedusting, removes H again
2S, SCO, CO
2, behind the micro-coal tar, become reducing gas, or be used for combustion gas, or be used for generating, or be used for the unstripped gas of production chemical product;
F. the above-mentioned iron ore pellets in the reduction shaft furnace adds thermal reduction generation direct-reduced iron through raw gas, is cooled to below 300 ℃ in the reduction shaft furnace bottom, adds N through bottom discharge mouth lock hopper
2Protection, the airtight reduced iron that sieves out coal ash and have integument, crushing and screening goes out direct-reduced iron.
12. the method for utilizing sensible heat of raw gas to produce direct-reduced iron according to claim 11, what it is characterized in that loading in the reduction shaft furnace is that the granularity of the pelletizing made of the powdered iron ore of integument is 30～80mm with coal dust, binding agent, lime powder mixture.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101245421A CN101787408B (en) | 2010-03-12 | 2010-03-12 | Method for producing direct reduced iron by utilizing sensible heat of raw gas |
| PCT/CN2011/000376 WO2011110054A1 (en) | 2010-03-12 | 2011-03-10 | Method for producing direct reduction iron (dri) using sensible heat of raw coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101245421A CN101787408B (en) | 2010-03-12 | 2010-03-12 | Method for producing direct reduced iron by utilizing sensible heat of raw gas |
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|---|---|
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| CN101787408B CN101787408B (en) | 2011-12-21 |
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| WO (1) | WO2011110054A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101928800A (en) * | 2010-08-15 | 2010-12-29 | 苏亚杰 | Method for directly reducing carbon-bearing ferromagnetic metal pellets by adopting sensible heat of raw gases |
| WO2011110054A1 (en) * | 2010-03-12 | 2011-09-15 | Su Yajie | Method for producing direct reduction iron (dri) using sensible heat of raw coal gas |
| CN103276131A (en) * | 2013-05-23 | 2013-09-04 | 苏亚杰 | Comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas |
| CN105177211A (en) * | 2015-09-07 | 2015-12-23 | 石家庄新华能源环保科技股份有限公司 | Method and device for producing high-purity iron |
| CN106244756A (en) * | 2016-08-28 | 2016-12-21 | 苏亚杰 | Direct Reducing Iron Process method is smelted in coal gas two sections series connection |
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| US20060162499A1 (en) * | 2002-12-21 | 2006-07-27 | Posco | Apparatus for manufacturing molten irons by hot compacting fine direct reduced irons and calcined additives and method using the same |
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| US5529599A (en) * | 1995-01-20 | 1996-06-25 | Calderon; Albert | Method for co-producing fuel and iron |
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| CN1896286B (en) * | 2006-06-13 | 2010-04-21 | 苏亚杰 | Method for producing direct iron-reduction by iron-ore briquet self-production reproduced gas |
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| CN101787408B (en) * | 2010-03-12 | 2011-12-21 | 苏亚杰 | Method for producing direct reduced iron by utilizing sensible heat of raw gas |
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- 2011-03-10 WO PCT/CN2011/000376 patent/WO2011110054A1/en active Application Filing
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| CN1118009A (en) * | 1995-06-23 | 1996-03-06 | 宝山钢铁(集团)公司 | Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed |
| US20060162499A1 (en) * | 2002-12-21 | 2006-07-27 | Posco | Apparatus for manufacturing molten irons by hot compacting fine direct reduced irons and calcined additives and method using the same |
| CN101397597A (en) * | 2007-09-26 | 2009-04-01 | 宝山钢铁股份有限公司 | Method for producing spongy iron by direct reduction of dry coal powder gasification and hot coal gas fine ore fluidized bed |
Cited By (11)
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|---|---|---|---|---|
| WO2011110054A1 (en) * | 2010-03-12 | 2011-09-15 | Su Yajie | Method for producing direct reduction iron (dri) using sensible heat of raw coal gas |
| CN101928800A (en) * | 2010-08-15 | 2010-12-29 | 苏亚杰 | Method for directly reducing carbon-bearing ferromagnetic metal pellets by adopting sensible heat of raw gases |
| CN103276131A (en) * | 2013-05-23 | 2013-09-04 | 苏亚杰 | Comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas |
| CN103276131B (en) * | 2013-05-23 | 2015-02-04 | 苏亚杰 | Comprehensive utilization process method of waste heat, residual pressure and residual gas of high-temperature raw gas |
| CN113699299A (en) * | 2013-07-29 | 2021-11-26 | 日本制铁株式会社 | Raw material for direct reduction, method for producing raw material for direct reduction, and method for producing reduced iron |
| CN105177211A (en) * | 2015-09-07 | 2015-12-23 | 石家庄新华能源环保科技股份有限公司 | Method and device for producing high-purity iron |
| CN106244756A (en) * | 2016-08-28 | 2016-12-21 | 苏亚杰 | Direct Reducing Iron Process method is smelted in coal gas two sections series connection |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101787408B (en) | 2011-12-21 |
| WO2011110054A1 (en) | 2011-09-15 |
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