• 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:
    An apparatus for producing sintered ores in which a sintering process is performed while a plurality of sintered carriages are connected in an endless orbit includes, in accordance with an embodiment of the present invention: a raw material supply unit including an upper ore bin and a storage bin; supplying the upper ores or mixed raw materials to the sintered wagons; a firing furnace arranged at a rear end of the raw material supply unit in a running direction of the sintered carriages to ignite a surface layer of the mixed raw materials loaded on the sintered carriages; and a microwave heating oven disposed at the rear end of the firing furnace to radiate microwaves onto a surface layer of the mixed raw materials loaded on the sintered carriages.
    公开号:AT518585A2
    申请号:T9484/2015
    申请日:2015-12-22
    公开日:2017-11-15
    发明作者:
    申请人:Posco；
    IPC主号:
    专利说明:

    TECHNICAL PART
    The present invention relates to an apparatus and a method for producing sintered ores, and more particularly to an apparatus and method for producing sintered ores, which produces recirculating fines on a top surface of a sintering carriage by blasting microwaves on an upper portion of the sintering carton to produce particle sizes of sintered ores to improve, minimize, and increase a recovery rate of the sintered ores, thereby improving productivity.
    STATE OF THE ART
    In general, sintered ores used as raw materials in a blast furnace occupy about 80% of the main raw materials, and the sintered ores are produced by charging blended raw materials and upper ores to a sintering apparatus and heat treating them at high temperature.
    Fig. 1 is a schematic view illustrating a sintering process using a general downstream type sintering machine, Dwight Lloyd, and Fig. 2 is a view illustrating the recovery rate according to the attitude of a sintering truck of the conventional general Dwight-Lloyd sintering machine ,
    As illustrated in FIGS. 1 and 2, in the sintering process using the general Dwight-Lloyd sintering machine, post-fine ores, supplemental raw materials and coke are stored in an ore bunker 10, the materials are applied at a predetermined amount, moisture is added and mixed with the materials in a mixing drum 11 mixed and the mixed materials are stored in a storage bunker 12.
    Thereafter, when a sintering cart 15 on which the upper ores are loaded by an upper ore bunker 14 is moved, mixed raw materials are added to the raw materials discharged through the stocker bunker 12 by a feed drum 13 behind the upper ore bunker by adding moisture 14, and the blended raw materials provided above are loaded on an upper part of the sintering truck 15 along a baffle 16 to cause a classification phenomenon.
    In this way, the sintering truck 15, on which the mixed raw materials have been completely charged, ignites a surface layer of the mixed raw materials by high-temperature sparks (about 1200C) in a firing furnace 17, and a main blower 18 is operated to generate a suction force.
    The suction force is transmitted through a chamber 19 to a suction chamber 20. The sintered ores are prepared by strongly sucking a lower part of the sintering truck 15 by the suction force transmitted to the suction chamber 20, thereby allowing air in the atmosphere to pass from an upper part to a lower part of the mixed raw materials which are loaded on the sintering trolley 15, and at the same time, powder iron ores are densified by high-temperature heat treatment.
    Meanwhile, a method for producing sintered ores in which the quality of sintered ores is excellent, fuel consumption is minimized, and the recovery rate and productivity are maximized is adopted. In the above-described Dwight-Lloyds sintering machine, since combustion gas is continuously sucked from a lower part of the sintering truck 15, cold air rapidly cools an upper layer formed up to one third of the entire depth of the sintering truck 15 from the surface of the mixed raw materials becomes. Thus, because the sintered ores at the top layer of the sintering cart 15, which occupy one-third of the produced sintered ores, can not obtain sufficient heat required for sintering, a large amount of return fines having diameters smaller than 5 mm are produced. and thus the recovery rate of the sintered ores is reduced.
    Examples of technologies which use microwaves to solve the above-described problems include "a method of producing sintered ores (Korean Patent Application Publication No. 10-1995-0018555)", "a method of producing sintered ores (Japanese Patent Publication Nos. 10-1995-0018555) Patent Application Publication No. 1996-014763), "" an apparatus and a method for removing moisture from mixed raw materials of sintered ores (Korean Patent Application Publication No. 10-2010-0026457) "and the like.
    However, the entire prior art corresponds to a method in which, after raw materials are loaded on a sintering truck and before a surface layer is ignited, moisture is dried by heating microwaves by heating the raw materials to improve the strength of pseudoparticles, or the raw materials are preheated to reduce energy consumption. In the prior art, a problem is not solved in which an upper layer of the sintering truck is cooled rapidly, a large amount of Rückfeingut, which is obtained when sizes of sintered ore particles are reduced to the upper layer, is generated, and thus the recovery rate the sintered ores are reduced.
    EPIPHANY
    TECHNICAL PROBLEM
    The present invention is conceived to solve the problems described above, and an aspect of the present invention is to provide an apparatus and a method for producing sintered ores, in which generation of recycle fines resulting from non-sintered ores is minimized Supplying heat to an upper layer of the sintered carriage by blasting microwaves onto a flat surface of blended raw materials of which a surface layer is ignited while the blended raw materials are loaded onto a sintering carton and pass through a firing furnace so that the quality and recovery rate of the sintered blanks Ores can be improved.
    TECHNICAL SOLUTION
    An apparatus for producing sintered ores in which a sintering process is performed while a plurality of sintered carriages are connected in an endless orbit according to an embodiment of the present invention may include: a raw material supply unit including an upper ore bin and a storage bin which supplies upper ores, or mixed raw materials, to the sintered carriages; a firing furnace, which is disposed at a rear end of the raw material supply unit in the running direction of the sintered carriages to ignite a surface layer of the mixed raw materials loaded on the sintered carriages; and a microwave heating furnace disposed at the rear end of the firing furnace to radiate microwaves onto a surface layer of the mixed raw materials loaded on the sintered carriages.
    The microwave oven can radiate microwaves at a frequency of 800 MHz-3GHz.
    The microwave heating furnace may be provided in a tunnel shape with both its ends opened in a running direction of the sintering carriages to radiate microwaves on a surface of the mixed raw materials housed in the sintered carriages while the sintered carriages pass through the microwave heating furnace.
    A method for producing sintered ores using a Dwight-Lloyd sintering machine according to an embodiment of the present invention may include: a raw material supplying step of supplying upper ores and mixed raw materials to sintered carriages which are moved on an endless orbit; an igniting step of igniting a surface layer of the mixed raw materials loaded on the sintered carriages; and a heating step of heating an upper layer of the mixed raw materials by irradiating microwaves onto an area of the mixed raw materials whose surface layer is ignited.
    In the heating step, microwaves having a frequency of 800MHz-3GHz can be radiated.
    In the heating step, the microwaves may be radiated for ten seconds to three minutes.
    BENEFICIAL EFFECTS
    According to an embodiment of the present invention, the required heat energy is supplied to an upper layer of mixed raw materials loaded on a sintering trolley even without affecting the flow of combustion gas using a microwave heating furnace, thus improving the quality and recovery rate of sintered ores can be.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Fig. 1 is a schematic view illustrating a sintering method using a general Dwight-Lloyd sintering machine.
    FIG. 2 is a view showing a recovery rate according to a location of a general Dwight-Lloyd type sinter wagon; FIG.
    Sintering machine according to the prior art illustrated.
    3 is a schematic view illustrating an apparatus for producing sintered ores according to an embodiment of the present invention.
    4 is a view illustrating a microwave heating furnace according to the embodiment of the present invention.
    5 is a flowchart illustrating a method for producing sintered ores according to the embodiment of the present invention; and
    6A and 6B are views illustrating temperature distributions of the general Dwight-Lloyd sintering machine according to the prior art and the sintered ore producing apparatus according to the embodiment of the present invention.
    BEST WAY FOR THE INVENTION
    Although exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings, the present invention is not limited or limited by the embodiments. For reference, in the present invention, the same reference numerals refer to substantially the same elements. Under such a rule, the contents described in the other drawings may be cited, and the contents which are considered or repeated by those skilled in the art may be omitted.
    3 is a schematic view illustrating an apparatus for producing sintered ores according to an embodiment of the present invention, and FIG. 4 is a view illustrating a microwave heating furnace according to the embodiment of the present invention.
    As illustrated in FIGS. 3 and 4, an apparatus for producing sintered ores according to an embodiment of the present invention includes a raw material supply unit that supplies raw materials to the interior of a plurality of sintered carriages 15 connected to each other in an endless circulation path, as well as one Ignition furnace 17 that ignites a surface layer of the raw materials loaded on the respective sintered carriages 15, and a microwave heating furnace 30 that irradiates microwaves onto the surface of the raw materials loaded on the sintered carriages 15.
    The raw materials supplied to the respective sintered carriages 15 include upper ores and mixed raw materials stacked on the upper ores, and the raw material supply unit includes an upper ore bunker 14 at an upper part of one side of a path along which the sintered carriages 15 are moved along a drive rail having the shape of an endless circulation path, in a direction of the width of the Sinterwag 15, and a Vorratsbunker 12, which is disposed behind the upper Erzbunker 14.
    The upper ore bunker 14 charges upper ores having a range of particle sizes of 10-15 mm onto the sintered carriages 15 at a thickness of about 50 mm, and the storage bunker 12 installed behind the upper ore bunker provides the mixed raw materials, to which a predetermined Amount of moisture is added to the Sinter Weighing 15.
    Here, the stocker bunker 12 discharges the mixed raw materials housed in the stocker bunker 12 to the inside of the sintered carriages 15 when a feed drum 13 installed at the lower part of the stocker bunker rotates, and adjusts the discharge amount of the mixed raw materials according to the rotation speed of the stocker To feed drum 13, and a baffle 16 for causing a classification phenomenon of the discharged mixed raw materials is installed below, so that the mixed raw materials discharged through the storage memory 12 are loaded on the interior of the Sinterwägen 15 along the baffle 16.
    A plurality of burners are installed at the upper part of the ignition furnace 17 to be spaced apart by a predetermined interval in the direction of the width of the sintered carriages 15 so as to sequentially ignite the surface layer of the mixed raw materials impinging on the plurality of sintered carriages 15, which pass through a lower side of the burner.
    A bottom surface and opposite ends of the microwave oven 30 have opened tunnel shapes so that the plurality of sintered carriages 15 can pass sequentially therethrough, and a microwave oscillating means is installed on the roof of the microwell furnace 30 to apply microwaves to the surface layer of the blended raw materials loaded on the sintered carriages 15 passing through a lower side of the microwave heating furnace 30.
    In general, the microwaves are in the form of low frequency energy, under electromagnetic energy, have a frequency in the range of 800-300,000 MHz, cause only rotation of molecules within a range of electromagnetic fields, and do not affect the structures of the molecules.
    In more detail, the microwaves are configured by an electric field and a magnetic field. Below this, the electric field serves to heat materials, and propagates at the speed of light. Further, because the photon energy (0.037 kcal / mole) is lower than the energy (80-120 kcal / mole) that can dissolve molecular bonding, the electric field heats only the materials, but does not affect the structures of the molecules.
    Accordingly, the microwave heating furnace 30 according to the embodiment of the present invention radiates microwaves which can quickly and uniformly heat internal and external temperatures in substitution for the conventional general heating scheme in which conductive heat is used, and thus the energy transfer rate is slow and a it takes a long time for materials to reach their heat equilibrium, which is inefficient.
    Here it is preferred that the frequency of the microwaves used is in the range of 800 MHz ~ 3GHz. The reason is that when the frequency of the microwaves exceeds 3 GHz, the cost is increased, the sintering temperature is excessively increased and thus the quality of the sintered ores produced is deteriorated, and when the frequency of the microwaves is below 800 MHz, the depth at which increases the microwaves entering the mixed raw materials, the energy density is lowered, and thus the upper layer of the mixed raw materials, at which return fines having a particle size smaller than 5 mm, is not sufficiently heated, and thus becomes a long time consumed for heating.
    Table 11
    Table 1 is a table representing temperatures radiated to general main components of mixed raw materials after microwave with a capacity of 2kW and a frequency of 2.4GHz for one minute, which are generally loaded on sintered trucks.
    As shown in Table 1, when the blended raw materials are heated using microwaves, the main components of the blended raw materials can be heated in a short time. Since the microwaves are blasted on a surface of the mixed raw materials loaded on the sintered carriages 15, an upper layer formed from a depth of one-third of the total depth of the sintered carriages 15 from a surface of the mixed raw materials is heated thereby to equalize a temperature that is cooled by cold air when combustion gas is consistently sucked from a lower side of the sintered carriages 15, so that generation of Rückfeingut at the upper layer can be minimized.
    Meanwhile, it is preferable that the microwave heating furnace 30 according to the embodiment of the present invention has a length at which each sintering cart 15 can pass therethrough for 1 ~ 2 minutes.
    The reason is that if the length of the microwave heating furnace 30 is shaped so that the transit time of the sintered carriages 15 is not more than one minute, the upper layer of the mixed raw materials loaded on the sintered carriages 15 is not heated sufficiently, so that the amount of recirculating fines produced is increased, and when the length is shaped so that the heating is carried out for two minutes or more, the reduced amounts of recycle fines produced are small compared with the increase in the manufacturing cost. Thus, it is preferable that the length of the microwave heating furnace 30 is shaped so that the sintered carriages 15 have a transit time of 1-2 minutes.
    [Table 2]
    Table 2 refers to a table representing return fines generation ratios according to microwave irradiation conditions. In the present invention, after a surface of blended raw materials of 120 kg is ignited using a flame, an upper layer is heated by irradiating microwaves (2 kW and 2.4 GHz). Next, combustion gas is drawn from below at a pressure of 1,600 mmHq, sample pieces are pulverized to a size of 50 mm or less after combustion is completely finished, the amount of generated rear fines having a size smaller than 5 mm is measured after a drum thickness is measured.
    As shown in Table 2, as compared with the conventional Dwight-Lloyd sintering machine which does not emit microwaves when microwaves are radiated for one minute, the amount of rear fines produced is reduced by about 7.4% and when microwaves are radiated for two minutes When the amount of returned fines produced is decreased by 13.4%, it can be determined that the amount of re-fines generated during sintering can be significantly reduced. [Table 3]
    Table 3 is a table representing return fines generation ratios according to irradiation times when the power of the microwaves is increased to 5 kW. It can be determined that the return fines generation ratios are rapidly reduced in a short time compared to 2 kW of Table 2.
    Thus, from the results measured in Table 2 and Table 3, it can be determined that the irradiation times can be significantly reduced as the power of the microwaves is increased.
    A method for producing sintered ores using the above-configured sintered ore producing apparatus according to the embodiment of the present invention will be described with reference to the accompanying drawings.
    5 is a flowchart illustrating the method of producing sintered ores according to the embodiment of the present invention.
    As illustrated in FIG. 5, the method for producing sintered ores according to the embodiment of the present invention includes a raw material supply step, a igniting step for igniting the surface of mixed raw materials, and a heating step of irradiating microwaves on a surface layer of the mixed raw materials ,
    In the raw material supply step, the upper ores and the blended raw materials are sequentially fed into the Sintered Wagons 15, which are moved in the endless orbit, using the upper ore bunker 14 and the stocker bunker 12.
    When the raw materials are completely supplied into the sintered carriages 15, the surface layer of the mixed raw materials accommodated in the sintered carriages 15 is ignited while the sintered carriages 15 to which the raw materials have been loaded pass through the igniter 17.
    6 are views illustrating the temperature distribution (a) of the conventional general Dwight-Lloyd sintering machine and the temperature distribution (b) of the apparatus for producing sintered ores according to the embodiment of the present invention.
    As illustrated in FIG. 6, in the method for producing sintered ores according to the embodiment of the present invention, when the surface is completely ignited, in the heating step, an upper layer of the mixed raw materials is irradiated by irradiating microwaves having a frequency of 800 MHz ~ 3 GHz on the surface layer of the mixed raw materials for one minute to two minutes loaded on the sintered carriages 15.
    Accordingly, thereafter, the temperature of the upper layer of the mixed raw materials, which is cooled when the combustion gas is continuously sucked from below, can be compensated, and thus required heat energy is supplied to the upper layer of the mixed raw materials loaded on the sintered carriages 15 the quality and recovery rate of the sintered ores can be improved.
    Further, since the heating is performed using microwaves, the flow of the combustion gas is not affected, so that the quality of sintered ores produced is uniform and their productivity can be improved.
    As above, when the upper layer of the mixed raw materials is fully heated, the main blower 18 is operated to generate a suction force on a lower side of the sintered carriages 15, so that while the combustion gas is being suctioned, the sintered ores are manufactured.
    As described above, although the descriptions have been made with reference to the exemplary embodiments of the present invention, it would be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention in the appended claims.
    [Description of Reference Numerals] 10: Ore bunker 11: Mixing drum 12: Storage bunker 13: Feeding drum 14: Upper ore bunker 15: Sinter weighing 16: Baffle 17: Ignition furnace 18: Main blower 19: Chamber 20: Suction chamber 21: Microwave heating furnace
    权利要求:
    Claims (6)
    [1]
    claims:
    An apparatus for producing sintered ores, in which a sintering operation is performed while a plurality of sintered carriages are connected to each other in an endless orbit, the apparatus comprising: a raw material supply unit comprising an upper ore bin and a storage hopper each having upper ores and deliver mixed raw materials to the sintered trucks; a firing furnace disposed at a rear end of the raw material supply unit in a running direction of the sintered carriages to ignite a surface layer of the mixed raw materials loaded on the sintered carriages; and a microwave heating furnace disposed at a rear end of the firing furnace to radiate microwaves onto a surface layer of the mixed raw materials loaded on the sintered carriages.
    [2]
    2. Apparatus according to claim 1 wherein the microwave oven emits microwaves at a frequency of 800MHz-3GHz.
    [3]
    The apparatus according to claim 1, wherein the microwave heating furnace is provided in a tunnel shape with both its ends opened in a running direction of the sintering carriages to radiate microwaves on a surface of the mixed raw materials accommodated in the sintered carriages while the sintered carriages pass through the microwave oven.
    [4]
    4. A method for producing sintered ores using a Dwight-Lloyd sintering machine, the method comprising: a raw material supplying step of supplying upper ores and mixed raw materials to sintered carriages which are moved in an endless orbit; an igniting step of igniting a surface layer of the mixed raw materials loaded on the sintered carriages; and a heating step of heating an upper layer of the mixed raw materials by irradiating microwaves onto an area of the mixed raw materials whose surface layer is ignited.
    [5]
    5. The method of claim 4, wherein in the heating step, micro waves are emitted at a frequency of 800 MHz ~ 3GHz.
    [6]
    The method of claim 5, wherein in the heating step, the microwaves are radiated for ten seconds to three minutes.
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    同族专利:
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    CN112410544A|2020-01-19|2021-02-26|中冶长天国际工程有限责任公司|Double-layer sintering method and sintering device|
    CN113503722A|2021-05-14|2021-10-15|中冶长天国际工程有限责任公司|Drying device and drying method for multi-heat-source coupled heating lump ore|
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    法律状态:
    2021-07-15| REJ| Rejection|Effective date: 20210715 |
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020150139586A|KR20170040826A|2015-10-05|2015-10-05|Apparatus and method for manufacturing sintered ore|
    PCT/KR2015/014119|WO2017061664A1|2015-10-05|2015-12-22|Sintered ore manufacturing apparatus and manufacturing method|
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