• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for manufacturing molten iron using fine coal of fine powder, and its purpose is to produce semi-coke using latent heat contained in the exhaust gas of the melting furnace to produce semicoking coke to some extent in the Korex process. To accommodate them. In order to achieve the above object, the present invention provides a fluidized bed final preliminary reduction reactor for final preliminary reduction of fine spectroscopy using a high-temperature reducing gas, to produce pig iron by melting the reduced iron-containing microspectral reduced in the fluidized bed pre-reduction reactor. A melting furnace, a cyclone for collecting powder generated in the melting furnace, and a powder melting apparatus for recharging the powder collected in the cyclone into a melting furnace, the method of manufacturing molten iron, the exhaust gas of the melting furnace in which powder is separated from the cyclone Coagulation and coking of the pulverized coal, and then supplied to the melting furnace, and volatilized and tar generated during the agglomeration and coking of the pulverized coal is sent to the tar condenser to condense the tar, tar removed volatiles to the melting furnace The summary relates to a method for producing molten iron using pulverized coal to be supplied.
    公开号:KR19980052526A
    申请号:KR1019960071533
    申请日:1996-12-24
    公开日:1998-09-25
    发明作者:이준혁；조민영；정영채
    申请人:김종진；포항종합제철 주식회사；신창식；재단법인 포항산업과학연구원；피투찌 알렉산더, 쉬타이너 피；뵈스트-알핀 인두스트리안라겐바우 게엠바하；
    IPC主号:
    专利说明:

    Method of manufacturing molten iron using pulverized coal
    The present invention relates to a method for producing molten iron using fine coal of fine powder, and more particularly, in a molten iron manufacturing process using plain coal, by lumping and coking pulverized coal using a blast furnace flue gas, The present invention relates to a method for manufacturing molten iron using pulverized coal.
    The blast furnace making method, which is currently in charge of the mainstream of steel production, can be considered as a technically almost completed process with characteristics such as high thermal efficiency, high productivity, high reduction capacity and long equipment life. However, the blast furnace fining method has high quality iron ore use, spectroscopy hardening treatment, supply and demand of raw coal and environmental pollution of coke oven, and it is difficult to control by mass production method. This has the disadvantage of being difficult.
    As a result, studies on alternative steelmaking methods have been actively conducted in various countries, and among them, the Korex method using lump coal and briquettes is the only commercial success. However, the Korex method also has the disadvantage of using only lump and lump coal. In order to solve this problem, a method of manufacturing pig iron is developed by reducing the unspectrality using a fluidized bed and then charging the applied gasifier.
    In the case of ordinary coal used as raw material in Korex, although the range of use is limited to lump coal, a large amount of coal is already included in the production process in the mountains, and it is transported from the mountain to the demand place. A large amount of powdered coal is further generated through a pretreatment process such as drying and classification performed for use as a raw material. As such, the coal dust contained in the mountainous land or generated during the process is present in up to 60% of all coals.
    Since such a large amount of powdered coal cannot be accommodated in the Corex process itself, it is used through a process such as blowing into the blast furnace through a pulverized coal injection (PCI) process or sending it separately to a coke plant to manufacture coke, but it is used in a coke plant. Coke coal is difficult to accommodate all of the powdered coal by the above method because its characteristics are different from that of coal produced in ordinary coal and its amount is large.
    If such coal is injected into the corex, the ventilation of the furnace is adversely affected, and the coal present in the furnace is discharged to the outside of the furnace by the rising air flow from the bottom of the furnace, which not only loads the gas cleaning system but also loads the gas cleaning system. It causes a lack of energy within.
    On the other hand, Corex is based on the use of only ordinary bullets, but a certain proportion of coke is generally used to achieve early operation normalization and stable operation after a long absence.
    MEANS TO SOLVE THE PROBLEM The present inventors made research and experiment in order to solve the problem which the said pulverized coal raises, and based on the result, this invention proposes the present invention, The present invention is the latent heat which the exhaust gas of a melting furnace contains the fine coal of fine powder. The purpose of the present invention is to manufacture coke using and to accommodate a certain amount of pulverized coal in the Korex process.
    1 is a process diagram showing a process for manufacturing molten iron according to a conventional method
    2 is a process chart showing a process for manufacturing molten iron according to the present invention.
    3 is a schematic view of a coke manufacturing apparatus that can be preferably applied to the present invention
    4 is a graph showing the strength of coke produced by the method of the present invention.
    * Description of the symbols for the main parts of the drawings *
    1 ...... Fluidized bed primary pre-reduction reactor 2 ...... Fluidized bed secondary pre-reduction reactor
    3 ...... Melt Gasification Furnace 4 ...... Cyclone
    5 ...... Body Melter 6 ...... Coke Manufacturing Equipment
    7 ...... Tar condenser
    The present invention is a fluidized bed final preliminary reduction reactor for final preliminary reduction of fine spectroscopy using a high-temperature reducing gas, a molten furnace for producing pig iron by melting iron-reduced fine spectroscopy reduced in the fluidized bed pre-reduction furnace, generated in the melting furnace. In the method for producing molten iron having a cyclone for collecting powder to be powdered, and a powder melting apparatus (5) for charging the powder collected in the cyclone back into the melting furnace, fine powder coal using the exhaust gas of the melting furnace in which the powder is separated from the cyclone And a coke, and then supplied to the melting furnace, and the volatiles and tar generated during the agglomeration and coking of the pulverized coal is sent to a tar condenser to condense the tar, and the volatiles from which tar is removed are fed to the melting furnace. It relates to a molten iron manufacturing method using.
    Hereinafter, the present invention will be described in more detail.
    In the molten iron manufacturing method to which the present invention can be preferably applied, as shown in FIG. 1, in the fluidized bed type primary preliminary reduction reactor (1), the fine spectroscopy is reduced by 30% or more, followed by the fluidized bed type 2 After reducing 90% or more in the secondary pre-reduction furnace (2), and then melted in the melting furnace (3) to produce pig iron, the powder generated in the melting furnace is collected in the cyclone (4), and the powder collected in the cyclone to the melting furnace ( 3) to the process of charging again.
    2 shows a molten iron manufacturing process in which a coke manufacturing process using exhaust gas of a melting furnace is added to the process shown in FIG. 1, which will be described in detail with reference to the present invention.
    In order to manufacture molten iron according to the present invention, as shown in FIG. 2, pulverized coal is charged into the coke production apparatus 6, and the pulverized coal is agglomerated using the exhaust gas of the melting furnace 3 in which powder is separated from the cyclone 4. And after coking, the obtained semi-coke must be supplied to the melting furnace 3.
    At this time, it is preferable to perform the compacting and coking process of the pulverized coal using the coke manufacturing apparatus shown in FIG.
    Coke manufacturing apparatus that can be preferably applied to the present invention, as shown in Figure 3, the fine coal storage tank 10 for storing pulverized coal and supply pulverized coal quantitatively to the cell for producing coke at the bottom, the pulverized coal supplied from the storage tank It is composed of a belt conveyor type cell 11 for coking in a certain shape, a high temperature chamber 12 for utilizing latent heat contained in the furnace flue gas as thermal energy required for the coking of coke. The apparatus for producing coke 6 is configured to produce coke with latent heat of exhaust gas of a melting furnace without grinding or crushing coal powder. In such a coke production apparatus 6, the pulverized coal is coked and agglomerated using the furnace exhaust gas passing through the chamber. At this time, the furnace flue gas used for coking and agglomeration is injected into the fluidized bed secondary reduction furnace via the chamber 12.
    Pulverized coal for the manufacture of semi-coke is known to be agglomerated as the volatiles are released when maintained at about 700 ℃ for more than 10 minutes, because the fine powder of ordinary coal used in Corex has its own cohesiveness.
    In the present invention, the volatile powder and tar generated during the compacting and coking of the pulverized coal are sent to a tar condenser to condense the tar and to remove the tar.
    The general difference between plain coal and coke depends on the volatiles and tar content, and plain coals containing volatiles and tars coke to release volatiles and tars. Among them, the tar condenses inside the pipe to shorten the service life of the equipment or, in severe cases, adversely affects the pipe. Therefore, the coal condensing device 7 is attached to the coke manufacturing apparatus 6 so that the pulverized coal is discharged while coking. The tar is removed from the process and the gas containing volatiles is blown back to the furnace.
    Coke produced using the coke manufacturing apparatus (6) is a state in which there is no volatile matter contained in the normal coal, when used in a high ratio in the melting furnace tends to reduce the heat calories than when using the normal coal, so this amount of heat is insufficient. In order to replenish, the volatile component generated by coking in the coke manufacturing apparatus 6 is supplied from the melting furnace side. Therefore, the amount of volatile matter in the melting furnace, which is insufficient due to the use of coke, can be supplemented with volatile matter generated in the coke production apparatus.
    Hereinafter, the present invention will be described in more detail with reference to Examples.
    EXAMPLE
    While operating by the method of this invention, the intensity | strength of the coke obtained according to the hardening temperature was measured, and the result is shown in FIG.
    In general, the ordinary coal and coke charged into the melting furnace is charged into the upper part of the melting furnace to take a gravity drop, so it must have a strength enough to withstand this, and the strength required for such a gravity drop is about 100kg / ㎠ As shown in FIG. 4, it can be seen that the coke prepared according to the method of the present invention has a reasonable strength.
    As described above, in the present invention, in the method for producing molten iron using ordinary coal, the unnecessary fine coal generated in the process is agglomerated and coked using the exhaust gas of the melting furnace to be charged and used in the melting furnace, thereby allowing us to use the particle size of the raw coal. You can broaden your range.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] A fluidized bed final preliminary reduction reactor for final preliminary reduction of fine spectroscopy using a high temperature reducing gas, a melting furnace for producing pig iron by melting iron-reduced fine spectroscopy reduced in the fluidized bed preliminary reduction reactor, generated in the melting furnace (3). In the method for producing molten iron, comprising a cyclone (4) for collecting the powder to be powdered, and a powder melting device (5) for charging the powder collected in the cyclone back into the melting furnace,
    Coagulation and coking of the pulverized coal using the exhaust gas of the melting furnace in which the powder is separated from the cyclone (4), and then supplied to the melting furnace, and the volatile powder and tar generated by the coagulation of the pulverized coal and tar tar condenser ( 7) condensing the tar to be sent to, the volatile powder from which tar is removed is supplied to the melting furnace characterized in that the molten iron manufacturing method
    [2" claim-type="Currently amended] The method of claim 1,
    The coagulation and coking process of the pulverized coal is a pulverized coal storage tank 10 for storing and supplying pulverized coal, a cell for manufacturing coke 11 of a belt conveyor type to agglomerate pulverized coal supplied from the storage tank in a constant shape, And a coke manufacturing apparatus (6) comprising a high temperature chamber (12) configured to utilize latent heat contained in the blast furnace flue gas to utilize heat energy required for agglomeration and coking. Method of manufacturing molten iron
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The method for producing molten iron using pulverized coal, characterized in that the exhaust gas temperature of the melting furnace 3 is 700 ° C. or more and the hardening and coking time is 10 minutes or more.
    类似技术:
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    同族专利:
    公开号 | 公开日
    KR100340490B1|2002-11-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-24|Application filed by 김종진, 포항종합제철 주식회사, 신창식, 재단법인 포항산업과학연구원, 피투찌 알렉산더, 쉬타이너 피, 뵈스트-알핀 인두스트리안라겐바우 게엠바하
    1996-12-24|Priority to KR1019960071533A
    1998-09-25|Publication of KR19980052526A
    2002-11-27|Application granted
    2002-11-27|Publication of KR100340490B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960071533A|KR100340490B1|1996-12-24|1996-12-24|Method for manufacturing steel melt using pulverized coal|
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