CN1035955C - Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed - Google Patents
Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed Download PDFInfo
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- CN1035955C CN1035955C CN95106752A CN95106752A CN1035955C CN 1035955 C CN1035955 C CN 1035955C CN 95106752 A CN95106752 A CN 95106752A CN 95106752 A CN95106752 A CN 95106752A CN 1035955 C CN1035955 C CN 1035955C
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- gas
- coal
- furnace
- making
- sponge iron
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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
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
Abstract
The present invention relates to a method for producing sponge iron by using gas made by a coal-base melting bed, which is characterized in that melting agents such as dolomite, coal smashed below 50mm, etc. are adjusted to have the slag alkalinity of 0.95 to 1.05, the mixed gas of oxygen of which the pressure is from 0.25 to 0.4MPa and steam is used as a gasifying agent to be led into a gasifying furnace of the melting bed to react with the melting agents at the temperature of 1550 to 1750 DEG C, and the gas which comprises 90 to 95% of CO and H2 is obtained; the gas is cooled and dusted to be led into a reduction vertical furnace, and the sponge iron is obtained after the gas reacts with lump ore and pellet ore. The gas obtained by the method has the advantages of low CO2 content, high gas temperature, energy source saving, shortened production flow and reduced cost, and high-quality gas with required components is obtained in one step without removing CO2 and rising temperature.
Description
The present invention relates to a kind of direct-reduction process and produce the method for sponge iron.
At present, the technology of coal-based production sponge iron has two classes, and a class is without gas making, and directly lump coal, ore and Wingdale mixing are together packed into rotary kiln or K-M direct reduction unit are produced sponge iron, and another kind of is to adopt fine coal to make raw material, with O
2, CO
2With water vapor be the method for vaporized chemical gas making in the fluidized-bed Gas-making Furnace, for example Chinese patent application 95102169.9 (applying date 950311) has proposed " method that a kind of coal-based gas making reduction shaft furnace method is produced sponge iron " but CO in the gas that this method obtains
2Account for 25～35% (volumes), need through removing CO
2Handle, simultaneously because fluidized-bed gas making requires the solid deslagging, and its temperature of reaction is 1100～1250 ℃, the coal gas that obtains also need heat up after washing, dedusting just can reach 850 ℃ of feeding shaft furnaces.Use the fluid injected bed vapourizing furnace to produce coal gas as Gas-making Furnace abroad in addition, its coal gas product is generally purposes such as Chemicals or generating, and its stove Nei Wenduda is more than 2000 ℃, and pressure is 3MPa, and refractory materials is difficult for solving, and cost is higher.
The objective of the invention is to obtain a kind of method of producing spongy iron by coal-base gas-making in vertical furnace, the coal gas of required composition can once take place from Gas-making Furnace, needn't be through removing CO
2And intensification, through cooling, can feed reduction shaft furnace after the dedusting and use.
For achieving the above object, the present invention is achieved in that
A kind of method of producing spongy iron by coal-base gas-making in vertical furnace, the method of gas making is: the oxide compound or the carbonate that will be crushed to following feed coal of 50mm and calcium, magnesium are flux, adjusting basicity of slag is 0.95～1.05, feeding pressure is that the oxygen of 0.25～0.4MPa and the mixed gas of water vapor are vaporized chemical, in coal-based Gas-making Furnace,, obtain CO+H in 1550～1750 ℃ of reactions
2Content accounts for 90～95% and also has a small amount of CO
2, H
2, N
2, H
2The coal gas of S, through cooling, dedusting can feed reduction shaft furnace and lump ore, pellet reaction obtain sponge iron.
Described flux is rhombspar, Wingdale or unslaked lime.
Described flux also comprises blast-furnace slag.
H in obtaining coal gas
2S content carries out desulfurization during greater than 0.1% (volume) to be handled.
The weight ratio of oxygen and water vapor is 1: 1～0.7 in the vaporized chemical.
H in the coal gas that obtains
2Account for 30～40%, CO accounts for 52～62%.
Below in conjunction with accompanying drawing the present invention is described in detail.
Fig. 1 is the schema of production method of the present invention.
Fig. 2 is coal-based Gas-making Furnace gas making synoptic diagram.
In order to obtain CO+H2Content reaches more than 90%, and temperature reaches the coal gas more than 1100 ℃, the present invention adopts combustion zone temperature high, the coal-based Gas-making Furnace gas making of slag tap, its technical process is: referring to Fig. 1,2, the raw material of gas making can be used various coals, but preferably selects incoherence and weak caking property, and degree of metamorphism is low, active good brown coal or bituminous coal, through fragmentation, it is the following feed coal of 50mm that screening obtains granularity, carries out dryly processing that to make the humidity of coal be 4～5%, be beneficial to the stable of output coal gas composition and temperature, be transported in the coal bin again and deliver to gasification furnace top through coal lock system, enter fluidization regions and fixed bed by gravity weight, flux is packed into coal in the stove, flux is dolomite, lime stone or quick lime, the working the slag physical and chemical performance participates in slag making, adjusts basicity CaO+MgO/SiO+AL2O
3=0.95～1.05, CaO/SiO wherein2=1.05～1.25, mobile bad such as slag also can add blast furnace slag, and be low to form fusion temperature, good fluidity, can be in time from the slag of cinder notch discharge. It is gasifying agent that this coal-based Gas-making Furnace adopts oxygen and water vapour, pressure is 0.25～0.4MPa, the weight ratio of oxygen and water vapour is 1: 1～0.7 in the gasifying agent, the content of regulating water vapour can be controlled the temperature of combustion zone, air port, oxygen and water vapour blast in the stove from the air port, carry out combustion reaction with semicoke or the coke of fixed bed, the temperature of combustion zone, air port reaches about 1550～1750 ℃, (to guarantee slag tap), can control by regulating combustion intensity, the coal gas of high temperature that burning produces passes fixed bed and rises, form reverse flow with the coal of packing into from furnace roof, coal contacts dehydration, devolatilization with coal gas of high temperature, fall into the bottom and form the semicoke fixed bed. Coal gas flows to the dry stable region on top, and coal dust or the coke powder carried secretly deposit at this, and the loss of dispersing is reduced, and furnace roof output coal gas temperature is more than 1100 ℃, and the discharged producer gas temperature can be controlled by the height of regulating coal speed and semicoke fixed bed. Following reaction occurs at coal-based Gas-making Furnace Raw coal and gasifying agent:
Wherein, reaction (1) is carried out when temperature is lower than 1200 ℃, reaction (2) is higher than 1300 ℃ in temperature and carries out, reaction (3), (4) also must be carried out under higher temperature, and the reaction rate of (4) is faster than (3), reaction (5) is easy to occur when temperature is low, and conversion ratio is very high, and it can affect H in the coal gas2/ CO ratio, reaction (6) and (7) is called methane reaction, just just easily occurs under low temperature and high pressure. Therefore, CO in the coal gas that obtains2Content is lower.
Under the reductive condition of gasification, the big portion of element sulphur contained in the coal is converted into H
2S is converted into COS on a small quantity.
CH
4Can be as the demonstration thing of hydrocarbons decompose degree.CH
4Low, can guarantee can not contain a large amount of hydrocarbon polymers in the coal gas, when temperature surpassed 1000 ℃, macromolecule carbon hydrogen compounds such as tar, benzene resolved into CO, CO
2, H
2, N
2, H
2S and COS can avoid producing the tar blocking pipe.In sum, the composition (volume) of the coal gas that obtains of the present invention is: (CO+H
2) account for 90～95%, H wherein
2Account for 30～40%, CO accounts for 52～62%, CO
22～3%, CH
4About 1%, also have small amount of N
2, H
2S etc.Gas temperature is 1100 ℃, is cooled to 900 ℃ through heat exchanger, import hot tornado dust collector dedusting after, dustiness≤20g/Nm
2The time, can feed reduction shaft furnace.As H
2S 〉=0.1% (volume) then need carry out desulfurization and handle.Fall into the carbon containing dust of fly-ash separator bottom, return vapourizing furnace and participate in gas making again, to carry the high-carbon vaporization rate.
Said temperature and composition are all reached the coal gas input shaft furnace that the reduction shaft furnace reducing gas requires, and raw material lump ore, pellet screen out less than behind the 6mm powder, pack into from furnace roof, and reducing gas and furnace charge carry out following reduction reaction and carburization reaction in the move toward one another process:
Compared with prior art, the present invention uses coal-based Gas-making Furnace gas making, goes out temperature and reaches 1100 ℃, CO+H
2Content surpasses 90% high quality coal gas, does not need through removing CO
2And temperature-rise period, but save energy shortens Production Flow Chart, reduces machinery investment and production cost, the lump ore or the pellet of reduction TFe 〉=60%, and the sponge iron degree of metalization that obtains can reach more than 90%.
Introduce embodiments of the invention below.
Use 1 meter of a diameter, high 5 meters coal-based Gas-making Furnace is made raw material with the Inner Mongol shenfu coal, and flux is ship mountain Wingdale, transfers basicity CaO+MgO/SiO
2+ AL
2O
3=0.98, CaO/SiO
2=1.10, feed 99.5%O
2Pure oxygen and water vapor be vaporized chemical, the weight ratio of oxygen and water vapor is 1: 08, coal gas 2150Nm per hour takes place in pressure 0.3MPa
3, its composition (volume) is: CO61.2%, H
234.1%, CO2 2.9%, CH
40.8%, other is N
2, H
2S etc., 1130 ℃ of gas temperatures, this gas is lowered the temperature through heat exchanger, after the hot tornado dust collector dedusting, during as reducing gas input reduction shaft furnace, its temperature is 880 ℃, the burden structure that reduction shaft furnace adopts is: 30%, Newman lump ore and 70% Brazilian pellet, through reduction in 8 hours, the sponge iron degree of metalization that obtains reached 92.5%.
Claims (6)
1. the method for a producing spongy iron by coal-base gas-making in vertical furnace, be that coal gas input reduction shaft furnace and lump ore, the pellet reaction that will obtain obtains sponge iron, it is characterized in that: the method for gas making is: the oxide compound or the carbonate that will be crushed to following feed coal of 50mm and calcium, magnesium are flux, adjusting basicity of slag is 0.95～1.05, feeding pressure is that the oxygen of 0.25～0.4MPa and the mixed gas of water vapor are vaporized chemical, in coal-based Gas-making Furnace in 1550～1750 ℃ of reactions, obtain CO+H2 content and account for 90～95%, also have a small amount of CO
2, H
2, N
2, H
2The coal gas of S feeds reduction shaft furnace through the cooling dedusting.
2. method according to claim 1 is characterized in that: described flux is rhombspar, Wingdale or unslaked lime.
3. method according to claim 1 is characterized in that: described flux also comprises blast-furnace slag.
4. method according to claim 1 is characterized in that: H in the coal gas that obtains
2S content carries out desulfurization and handles during greater than 0.1% (volume).
5. method according to claim 1 is characterized in that: in the described vaporized chemical in the oxygen and the weight ratio of water vapor be 1: 1～0.7.
6. method according to claim 1 is characterized in that: obtain H in the coal gas
2Account for 30～40%, CO accounts for 52～62%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95106752A CN1035955C (en) | 1995-06-23 | 1995-06-23 | Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95106752A CN1035955C (en) | 1995-06-23 | 1995-06-23 | Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1118009A CN1118009A (en) | 1996-03-06 |
| CN1035955C true CN1035955C (en) | 1997-09-24 |
Family
ID=5076015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95106752A Expired - Fee Related CN1035955C (en) | 1995-06-23 | 1995-06-23 | Method for production of sponge iron by using gas-making shaft furnace method of coal-base melting bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1035955C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4250472B2 (en) * | 2003-07-24 | 2009-04-08 | 新日本製鐵株式会社 | Method for producing reduced iron and reducing gas for blast furnace charge, method for using reduced iron, and method for using reducing gas |
| CN100424190C (en) * | 2005-08-19 | 2008-10-08 | 张和起 | Sponge iron for furnace charge and its manufacturing method |
| CN101787408B (en) * | 2010-03-12 | 2011-12-21 | 苏亚杰 | Method for producing direct reduced iron by utilizing sensible heat of raw 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 |
| CN102409128B (en) * | 2011-12-06 | 2013-03-27 | 刘元生 | Device and process for making gas and reducing iron through coal derived fusion melting bed |
| CN103290160B (en) * | 2012-02-29 | 2015-03-04 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
| CN103992822A (en) * | 2014-05-16 | 2014-08-20 | 新奥科技发展有限公司 | Catalytic gasification method and device |
| CN104480310A (en) * | 2014-12-15 | 2015-04-01 | 湖南省加嘉锑业科技有限公司 | Heavy metal extracting device |
| CN110305998B (en) * | 2019-06-28 | 2021-03-16 | 武汉钢铁有限公司 | Online regulation and control method and device for reducing S content in blast furnace gas |
| CN111234885B (en) * | 2019-12-30 | 2021-09-14 | 上海仅优节能环保科技有限公司 | Hot rolling mill gas purification material and device and method for reducing oxidation burning loss of steel billets |
-
1995
- 1995-06-23 CN CN95106752A patent/CN1035955C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1118009A (en) | 1996-03-06 |
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Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
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